arch/x86/kvm/vmx/nested.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/frame.h>
   4 #include <linux/percpu.h>
   5
   6 #include <asm/debugreg.h>
   7 #include <asm/mmu_context.h>
   8
   9 #include "cpuid.h"
  10 #include "hyperv.h"
  11 #include "mmu.h"
  12 #include "nested.h"
  13 #include "trace.h"
  14 #include "x86.h"
  15
  16 static bool __read_mostly enable_shadow_vmcs = 1;
  17 module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
  18
  19 static bool __read_mostly nested_early_check = 0;
  20 module_param(nested_early_check, bool, S_IRUGO);
  21
  22 /*
  23  * Hyper-V requires all of these, so mark them as supported even though
  24  * they are just treated the same as all-context.
  25  */
  26 #define VMX_VPID_EXTENT_SUPPORTED_MASK          \
  27         (VMX_VPID_EXTENT_INDIVIDUAL_ADDR_BIT |  \
  28         VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT |    \
  29         VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT |    \
  30         VMX_VPID_EXTENT_SINGLE_NON_GLOBAL_BIT)
  31
  32 #define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5
  33
  34 enum {
  35         VMX_VMREAD_BITMAP,
  36         VMX_VMWRITE_BITMAP,
  37         VMX_BITMAP_NR
  38 };
  39 static unsigned long *vmx_bitmap[VMX_BITMAP_NR];
  40
  41 #define vmx_vmread_bitmap                    (vmx_bitmap[VMX_VMREAD_BITMAP])
  42 #define vmx_vmwrite_bitmap                   (vmx_bitmap[VMX_VMWRITE_BITMAP])
  43
  44 static u16 shadow_read_only_fields[] = {
  45 #define SHADOW_FIELD_RO(x) x,
  46 #include "vmcs_shadow_fields.h"
  47 };
  48 static int max_shadow_read_only_fields =
  49         ARRAY_SIZE(shadow_read_only_fields);
  50
  51 static u16 shadow_read_write_fields[] = {
  52 #define SHADOW_FIELD_RW(x) x,
  53 #include "vmcs_shadow_fields.h"
  54 };
  55 static int max_shadow_read_write_fields =
  56         ARRAY_SIZE(shadow_read_write_fields);
  57
  58 static void init_vmcs_shadow_fields(void)
  59 {
  60         int i, j;
  61
  62         memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE);
  63         memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE);
  64
  65         for (i = j = 0; i < max_shadow_read_only_fields; i++) {
  66                 u16 field = shadow_read_only_fields[i];
  67
  68                 if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 &&
  69                     (i + 1 == max_shadow_read_only_fields ||
  70                      shadow_read_only_fields[i + 1] != field + 1))
  71                         pr_err("Missing field from shadow_read_only_field %x\n",
  72                                field + 1);
  73
  74                 clear_bit(field, vmx_vmread_bitmap);
  75 #ifdef CONFIG_X86_64
  76                 if (field & 1)
  77                         continue;
  78 #endif
  79                 if (j < i)
  80                         shadow_read_only_fields[j] = field;
  81                 j++;
  82         }
  83         max_shadow_read_only_fields = j;
  84
  85         for (i = j = 0; i < max_shadow_read_write_fields; i++) {
  86                 u16 field = shadow_read_write_fields[i];
  87
  88                 if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 &&
  89                     (i + 1 == max_shadow_read_write_fields ||
  90                      shadow_read_write_fields[i + 1] != field + 1))
  91                         pr_err("Missing field from shadow_read_write_field %x\n",
  92                                field + 1);
  93
  94                 /*
  95                  * PML and the preemption timer can be emulated, but the
  96                  * processor cannot vmwrite to fields that don't exist
  97                  * on bare metal.
  98                  */
  99                 switch (field) {
 100                 case GUEST_PML_INDEX:
 101                         if (!cpu_has_vmx_pml())
 102                                 continue;
 103                         break;
 104                 case VMX_PREEMPTION_TIMER_VALUE:
 105                         if (!cpu_has_vmx_preemption_timer())
 106                                 continue;
 107                         break;
 108                 case GUEST_INTR_STATUS:
 109                         if (!cpu_has_vmx_apicv())
 110                                 continue;
 111                         break;
 112                 default:
 113                         break;
 114                 }
 115
 116                 clear_bit(field, vmx_vmwrite_bitmap);
 117                 clear_bit(field, vmx_vmread_bitmap);
 118 #ifdef CONFIG_X86_64
 119                 if (field & 1)
 120                         continue;
 121 #endif
 122                 if (j < i)
 123                         shadow_read_write_fields[j] = field;
 124                 j++;
 125         }
 126         max_shadow_read_write_fields = j;
 127 }
 128
 129 /*
 130  * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
 131  * set the success or error code of an emulated VMX instruction (as specified
 132  * by Vol 2B, VMX Instruction Reference, "Conventions"), and skip the emulated
 133  * instruction.
 134  */
 135 static int nested_vmx_succeed(struct kvm_vcpu *vcpu)
 136 {
 137         vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
 138                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
 139                             X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
 140         return kvm_skip_emulated_instruction(vcpu);
 141 }
 142
 143 static int nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
 144 {
 145         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
 146                         & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
 147                             X86_EFLAGS_SF | X86_EFLAGS_OF))
 148                         | X86_EFLAGS_CF);
 149         return kvm_skip_emulated_instruction(vcpu);
 150 }
 151
 152 static int nested_vmx_failValid(struct kvm_vcpu *vcpu,
 153                                 u32 vm_instruction_error)
 154 {
 155         struct vcpu_vmx *vmx = to_vmx(vcpu);
 156
 157         /*
 158          * failValid writes the error number to the current VMCS, which
 159          * can't be done if there isn't a current VMCS.
 160          */
 161         if (vmx->nested.current_vmptr == -1ull && !vmx->nested.hv_evmcs)
 162                 return nested_vmx_failInvalid(vcpu);
 163
 164         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
 165                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
 166                             X86_EFLAGS_SF | X86_EFLAGS_OF))
 167                         | X86_EFLAGS_ZF);
 168         get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
 169         /*
 170          * We don't need to force a shadow sync because
 171          * VM_INSTRUCTION_ERROR is not shadowed
 172          */
 173         return kvm_skip_emulated_instruction(vcpu);
 174 }
 175
 176 static void nested_vmx_abort(struct kvm_vcpu *vcpu, u32 indicator)
 177 {
 178         /* TODO: not to reset guest simply here. */
 179         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 180         pr_debug_ratelimited("kvm: nested vmx abort, indicator %d\n", indicator);
 181 }
 182
 183 static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
 184 {
 185         vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS);
 186         vmcs_write64(VMCS_LINK_POINTER, -1ull);
 187 }
 188
 189 static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 190 {
 191         struct vcpu_vmx *vmx = to_vmx(vcpu);
 192
 193         if (!vmx->nested.hv_evmcs)
 194                 return;
 195
 196         kunmap(vmx->nested.hv_evmcs_page);
 197         kvm_release_page_dirty(vmx->nested.hv_evmcs_page);
 198         vmx->nested.hv_evmcs_vmptr = -1ull;
 199         vmx->nested.hv_evmcs_page = NULL;
 200         vmx->nested.hv_evmcs = NULL;
 201 }
 202
 203 /*
 204  * Free whatever needs to be freed from vmx->nested when L1 goes down, or
 205  * just stops using VMX.
 206  */
 207 static void free_nested(struct kvm_vcpu *vcpu)
 208 {
 209         struct vcpu_vmx *vmx = to_vmx(vcpu);
 210
 211         if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
 212                 return;
 213
 214         vmx->nested.vmxon = false;
 215         vmx->nested.smm.vmxon = false;
 216         free_vpid(vmx->nested.vpid02);
 217         vmx->nested.posted_intr_nv = -1;
 218         vmx->nested.current_vmptr = -1ull;
 219         if (enable_shadow_vmcs) {
 220                 vmx_disable_shadow_vmcs(vmx);
 221                 vmcs_clear(vmx->vmcs01.shadow_vmcs);
 222                 free_vmcs(vmx->vmcs01.shadow_vmcs);
 223                 vmx->vmcs01.shadow_vmcs = NULL;
 224         }
 225         kfree(vmx->nested.cached_vmcs12);
 226         kfree(vmx->nested.cached_shadow_vmcs12);
 227         /* Unpin physical memory we referred to in the vmcs02 */
 228         if (vmx->nested.apic_access_page) {
 229                 kvm_release_page_dirty(vmx->nested.apic_access_page);
 230                 vmx->nested.apic_access_page = NULL;
 231         }
 232         if (vmx->nested.virtual_apic_page) {
 233                 kvm_release_page_dirty(vmx->nested.virtual_apic_page);
 234                 vmx->nested.virtual_apic_page = NULL;
 235         }
 236         if (vmx->nested.pi_desc_page) {
 237                 kunmap(vmx->nested.pi_desc_page);
 238                 kvm_release_page_dirty(vmx->nested.pi_desc_page);
 239                 vmx->nested.pi_desc_page = NULL;
 240                 vmx->nested.pi_desc = NULL;
 241         }
 242
 243         kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
 244
 245         nested_release_evmcs(vcpu);
 246
 247         free_loaded_vmcs(&vmx->nested.vmcs02);
 248 }
 249
 250 static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
 251 {
 252         struct vcpu_vmx *vmx = to_vmx(vcpu);
 253         int cpu;
 254
 255         if (vmx->loaded_vmcs == vmcs)
 256                 return;
 257
 258         cpu = get_cpu();
 259         vmx_vcpu_put(vcpu);
 260         vmx->loaded_vmcs = vmcs;
 261         vmx_vcpu_load(vcpu, cpu);
 262         put_cpu();
 263
 264         vm_entry_controls_reset_shadow(vmx);
 265         vm_exit_controls_reset_shadow(vmx);
 266         vmx_segment_cache_clear(vmx);
 267 }
 268
 269 /*
 270  * Ensure that the current vmcs of the logical processor is the
 271  * vmcs01 of the vcpu before calling free_nested().
 272  */
 273 void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu)
 274 {
 275         vcpu_load(vcpu);
 276         vmx_leave_nested(vcpu);
 277         vmx_switch_vmcs(vcpu, &to_vmx(vcpu)->vmcs01);
 278         free_nested(vcpu);
 279         vcpu_put(vcpu);
 280 }
 281
 282 static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
 283                 struct x86_exception *fault)
 284 {
 285         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 286         struct vcpu_vmx *vmx = to_vmx(vcpu);
 287         u32 exit_reason;
 288         unsigned long exit_qualification = vcpu->arch.exit_qualification;
 289
 290         if (vmx->nested.pml_full) {
 291                 exit_reason = EXIT_REASON_PML_FULL;
 292                 vmx->nested.pml_full = false;
 293                 exit_qualification &= INTR_INFO_UNBLOCK_NMI;
 294         } else if (fault->error_code & PFERR_RSVD_MASK)
 295                 exit_reason = EXIT_REASON_EPT_MISCONFIG;
 296         else
 297                 exit_reason = EXIT_REASON_EPT_VIOLATION;
 298
 299         nested_vmx_vmexit(vcpu, exit_reason, 0, exit_qualification);
 300         vmcs12->guest_physical_address = fault->address;
 301 }
 302
 303 static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu)
 304 {
 305         WARN_ON(mmu_is_nested(vcpu));
 306
 307         vcpu->arch.mmu = &vcpu->arch.guest_mmu;
 308         kvm_init_shadow_ept_mmu(vcpu,
 309                         to_vmx(vcpu)->nested.msrs.ept_caps &
 310                         VMX_EPT_EXECUTE_ONLY_BIT,
 311                         nested_ept_ad_enabled(vcpu),
 312                         nested_ept_get_cr3(vcpu));
 313         vcpu->arch.mmu->set_cr3           = vmx_set_cr3;
 314         vcpu->arch.mmu->get_cr3           = nested_ept_get_cr3;
 315         vcpu->arch.mmu->inject_page_fault = nested_ept_inject_page_fault;
 316         vcpu->arch.mmu->get_pdptr         = kvm_pdptr_read;
 317
 318         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
 319 }
 320
 321 static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu)
 322 {
 323         vcpu->arch.mmu = &vcpu->arch.root_mmu;
 324         vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
 325 }
 326
 327 static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
 328                                             u16 error_code)
 329 {
 330         bool inequality, bit;
 331
 332         bit = (vmcs12->exception_bitmap & (1u << PF_VECTOR)) != 0;
 333         inequality =
 334                 (error_code & vmcs12->page_fault_error_code_mask) !=
 335                  vmcs12->page_fault_error_code_match;
 336         return inequality ^ bit;
 337 }
 338
 339
 340 /*
 341  * KVM wants to inject page-faults which it got to the guest. This function
 342  * checks whether in a nested guest, we need to inject them to L1 or L2.
 343  */
 344 static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit_qual)
 345 {
 346         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 347         unsigned int nr = vcpu->arch.exception.nr;
 348         bool has_payload = vcpu->arch.exception.has_payload;
 349         unsigned long payload = vcpu->arch.exception.payload;
 350
 351         if (nr == PF_VECTOR) {
 352                 if (vcpu->arch.exception.nested_apf) {
 353                         *exit_qual = vcpu->arch.apf.nested_apf_token;
 354                         return 1;
 355                 }
 356                 if (nested_vmx_is_page_fault_vmexit(vmcs12,
 357                                                     vcpu->arch.exception.error_code)) {
 358                         *exit_qual = has_payload ? payload : vcpu->arch.cr2;
 359                         return 1;
 360                 }
 361         } else if (vmcs12->exception_bitmap & (1u << nr)) {
 362                 if (nr == DB_VECTOR) {
 363                         if (!has_payload) {
 364                                 payload = vcpu->arch.dr6;
 365                                 payload &= ~(DR6_FIXED_1 | DR6_BT);
 366                                 payload ^= DR6_RTM;
 367                         }
 368                         *exit_qual = payload;
 369                 } else
 370                         *exit_qual = 0;
 371                 return 1;
 372         }
 373
 374         return 0;
 375 }
 376
 377
 378 static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
 379                 struct x86_exception *fault)
 380 {
 381         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 382
 383         WARN_ON(!is_guest_mode(vcpu));
 384
 385         if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code) &&
 386                 !to_vmx(vcpu)->nested.nested_run_pending) {
 387                 vmcs12->vm_exit_intr_error_code = fault->error_code;
 388                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
 389                                   PF_VECTOR | INTR_TYPE_HARD_EXCEPTION |
 390                                   INTR_INFO_DELIVER_CODE_MASK | INTR_INFO_VALID_MASK,
 391                                   fault->address);
 392         } else {
 393                 kvm_inject_page_fault(vcpu, fault);
 394         }
 395 }
 396
 397 static bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
 398 {
 399         return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu));
 400 }
 401
 402 static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu,
 403                                                struct vmcs12 *vmcs12)
 404 {
 405         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
 406                 return 0;
 407
 408         if (!page_address_valid(vcpu, vmcs12->io_bitmap_a) ||
 409             !page_address_valid(vcpu, vmcs12->io_bitmap_b))
 410                 return -EINVAL;
 411
 412         return 0;
 413 }
 414
 415 static int nested_vmx_check_msr_bitmap_controls(struct kvm_vcpu *vcpu,
 416                                                 struct vmcs12 *vmcs12)
 417 {
 418         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
 419                 return 0;
 420
 421         if (!page_address_valid(vcpu, vmcs12->msr_bitmap))
 422                 return -EINVAL;
 423
 424         return 0;
 425 }
 426
 427 static int nested_vmx_check_tpr_shadow_controls(struct kvm_vcpu *vcpu,
 428                                                 struct vmcs12 *vmcs12)
 429 {
 430         if (!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW))
 431                 return 0;
 432
 433         if (!page_address_valid(vcpu, vmcs12->virtual_apic_page_addr))
 434                 return -EINVAL;
 435
 436         return 0;
 437 }
 438
 439 /*
 440  * Check if MSR is intercepted for L01 MSR bitmap.
 441  */
 442 static bool msr_write_intercepted_l01(struct kvm_vcpu *vcpu, u32 msr)
 443 {
 444         unsigned long *msr_bitmap;
 445         int f = sizeof(unsigned long);
 446
 447         if (!cpu_has_vmx_msr_bitmap())
 448                 return true;
 449
 450         msr_bitmap = to_vmx(vcpu)->vmcs01.msr_bitmap;
 451
 452         if (msr <= 0x1fff) {
 453                 return !!test_bit(msr, msr_bitmap + 0x800 / f);
 454         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
 455                 msr &= 0x1fff;
 456                 return !!test_bit(msr, msr_bitmap + 0xc00 / f);
 457         }
 458
 459         return true;
 460 }
 461
 462 /*
 463  * If a msr is allowed by L0, we should check whether it is allowed by L1.
 464  * The corresponding bit will be cleared unless both of L0 and L1 allow it.
 465  */
 466 static void nested_vmx_disable_intercept_for_msr(unsigned long *msr_bitmap_l1,
 467                                                unsigned long *msr_bitmap_nested,
 468                                                u32 msr, int type)
 469 {
 470         int f = sizeof(unsigned long);
 471
 472         /*
 473          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
 474          * have the write-low and read-high bitmap offsets the wrong way round.
 475          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
 476          */
 477         if (msr <= 0x1fff) {
 478                 if (type & MSR_TYPE_R &&
 479                    !test_bit(msr, msr_bitmap_l1 + 0x000 / f))
 480                         /* read-low */
 481                         __clear_bit(msr, msr_bitmap_nested + 0x000 / f);
 482
 483                 if (type & MSR_TYPE_W &&
 484                    !test_bit(msr, msr_bitmap_l1 + 0x800 / f))
 485                         /* write-low */
 486                         __clear_bit(msr, msr_bitmap_nested + 0x800 / f);
 487
 488         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
 489                 msr &= 0x1fff;
 490                 if (type & MSR_TYPE_R &&
 491                    !test_bit(msr, msr_bitmap_l1 + 0x400 / f))
 492                         /* read-high */
 493                         __clear_bit(msr, msr_bitmap_nested + 0x400 / f);
 494
 495                 if (type & MSR_TYPE_W &&
 496                    !test_bit(msr, msr_bitmap_l1 + 0xc00 / f))
 497                         /* write-high */
 498                         __clear_bit(msr, msr_bitmap_nested + 0xc00 / f);
 499
 500         }
 501 }
 502
 503 static inline void enable_x2apic_msr_intercepts(unsigned long *msr_bitmap) {
 504         int msr;
 505
 506         for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) {
 507                 unsigned word = msr / BITS_PER_LONG;
 508
 509                 msr_bitmap[word] = ~0;
 510                 msr_bitmap[word + (0x800 / sizeof(long))] = ~0;
 511         }
 512 }
 513
 514 /*
 515  * Merge L0's and L1's MSR bitmap, return false to indicate that
 516  * we do not use the hardware.
 517  */
 518 static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 519                                                  struct vmcs12 *vmcs12)
 520 {
 521         int msr;
 522         struct page *page;
 523         unsigned long *msr_bitmap_l1;
 524         unsigned long *msr_bitmap_l0 = to_vmx(vcpu)->nested.vmcs02.msr_bitmap;
 525         /*
 526          * pred_cmd & spec_ctrl are trying to verify two things:
 527          *
 528          * 1. L0 gave a permission to L1 to actually passthrough the MSR. This
 529          *    ensures that we do not accidentally generate an L02 MSR bitmap
 530          *    from the L12 MSR bitmap that is too permissive.
 531          * 2. That L1 or L2s have actually used the MSR. This avoids
 532          *    unnecessarily merging of the bitmap if the MSR is unused. This
 533          *    works properly because we only update the L01 MSR bitmap lazily.
 534          *    So even if L0 should pass L1 these MSRs, the L01 bitmap is only
 535          *    updated to reflect this when L1 (or its L2s) actually write to
 536          *    the MSR.
 537          */
 538         bool pred_cmd = !msr_write_intercepted_l01(vcpu, MSR_IA32_PRED_CMD);
 539         bool spec_ctrl = !msr_write_intercepted_l01(vcpu, MSR_IA32_SPEC_CTRL);
 540
 541         /* Nothing to do if the MSR bitmap is not in use.  */
 542         if (!cpu_has_vmx_msr_bitmap() ||
 543             !nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
 544                 return false;
 545
 546         if (!nested_cpu_has_virt_x2apic_mode(vmcs12) &&
 547             !pred_cmd && !spec_ctrl)
 548                 return false;
 549
 550         page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->msr_bitmap);
 551         if (is_error_page(page))
 552                 return false;
 553
 554         msr_bitmap_l1 = (unsigned long *)kmap(page);
 555
 556         /*
 557          * To keep the control flow simple, pay eight 8-byte writes (sixteen
 558          * 4-byte writes on 32-bit systems) up front to enable intercepts for
 559          * the x2APIC MSR range and selectively disable them below.
 560          */
 561         enable_x2apic_msr_intercepts(msr_bitmap_l0);
 562
 563         if (nested_cpu_has_virt_x2apic_mode(vmcs12)) {
 564                 if (nested_cpu_has_apic_reg_virt(vmcs12)) {
 565                         /*
 566                          * L0 need not intercept reads for MSRs between 0x800
 567                          * and 0x8ff, it just lets the processor take the value
 568                          * from the virtual-APIC page; take those 256 bits
 569                          * directly from the L1 bitmap.
 570                          */
 571                         for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) {
 572                                 unsigned word = msr / BITS_PER_LONG;
 573
 574                                 msr_bitmap_l0[word] = msr_bitmap_l1[word];
 575                         }
 576                 }
 577
 578                 nested_vmx_disable_intercept_for_msr(
 579                         msr_bitmap_l1, msr_bitmap_l0,
 580                         X2APIC_MSR(APIC_TASKPRI),
 581                         MSR_TYPE_R | MSR_TYPE_W);
 582
 583                 if (nested_cpu_has_vid(vmcs12)) {
 584                         nested_vmx_disable_intercept_for_msr(
 585                                 msr_bitmap_l1, msr_bitmap_l0,
 586                                 X2APIC_MSR(APIC_EOI),
 587                                 MSR_TYPE_W);
 588                         nested_vmx_disable_intercept_for_msr(
 589                                 msr_bitmap_l1, msr_bitmap_l0,
 590                                 X2APIC_MSR(APIC_SELF_IPI),
 591                                 MSR_TYPE_W);
 592                 }
 593         }
 594
 595         if (spec_ctrl)
 596                 nested_vmx_disable_intercept_for_msr(
 597                                         msr_bitmap_l1, msr_bitmap_l0,
 598                                         MSR_IA32_SPEC_CTRL,
 599                                         MSR_TYPE_R | MSR_TYPE_W);
 600
 601         if (pred_cmd)
 602                 nested_vmx_disable_intercept_for_msr(
 603                                         msr_bitmap_l1, msr_bitmap_l0,
 604                                         MSR_IA32_PRED_CMD,
 605                                         MSR_TYPE_W);
 606
 607         kunmap(page);
 608         kvm_release_page_clean(page);
 609
 610         return true;
 611 }
 612
 613 static void nested_cache_shadow_vmcs12(struct kvm_vcpu *vcpu,
 614                                        struct vmcs12 *vmcs12)
 615 {
 616         struct vmcs12 *shadow;
 617         struct page *page;
 618
 619         if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
 620             vmcs12->vmcs_link_pointer == -1ull)
 621                 return;
 622
 623         shadow = get_shadow_vmcs12(vcpu);
 624         page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer);
 625
 626         memcpy(shadow, kmap(page), VMCS12_SIZE);
 627
 628         kunmap(page);
 629         kvm_release_page_clean(page);
 630 }
 631
 632 static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu,
 633                                               struct vmcs12 *vmcs12)
 634 {
 635         struct vcpu_vmx *vmx = to_vmx(vcpu);
 636
 637         if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
 638             vmcs12->vmcs_link_pointer == -1ull)
 639                 return;
 640
 641         kvm_write_guest(vmx->vcpu.kvm, vmcs12->vmcs_link_pointer,
 642                         get_shadow_vmcs12(vcpu), VMCS12_SIZE);
 643 }
 644
 645 /*
 646  * In nested virtualization, check if L1 has set
 647  * VM_EXIT_ACK_INTR_ON_EXIT
 648  */
 649 static bool nested_exit_intr_ack_set(struct kvm_vcpu *vcpu)
 650 {
 651         return get_vmcs12(vcpu)->vm_exit_controls &
 652                 VM_EXIT_ACK_INTR_ON_EXIT;
 653 }
 654
 655 static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
 656 {
 657         return nested_cpu_has_nmi_exiting(get_vmcs12(vcpu));
 658 }
 659
 660 static int nested_vmx_check_apic_access_controls(struct kvm_vcpu *vcpu,
 661                                           struct vmcs12 *vmcs12)
 662 {
 663         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) &&
 664             !page_address_valid(vcpu, vmcs12->apic_access_addr))
 665                 return -EINVAL;
 666         else
 667                 return 0;
 668 }
 669
 670 static int nested_vmx_check_apicv_controls(struct kvm_vcpu *vcpu,
 671                                            struct vmcs12 *vmcs12)
 672 {
 673         if (!nested_cpu_has_virt_x2apic_mode(vmcs12) &&
 674             !nested_cpu_has_apic_reg_virt(vmcs12) &&
 675             !nested_cpu_has_vid(vmcs12) &&
 676             !nested_cpu_has_posted_intr(vmcs12))
 677                 return 0;
 678
 679         /*
 680          * If virtualize x2apic mode is enabled,
 681          * virtualize apic access must be disabled.
 682          */
 683         if (nested_cpu_has_virt_x2apic_mode(vmcs12) &&
 684             nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
 685                 return -EINVAL;
 686
 687         /*
 688          * If virtual interrupt delivery is enabled,
 689          * we must exit on external interrupts.
 690          */
 691         if (nested_cpu_has_vid(vmcs12) &&
 692            !nested_exit_on_intr(vcpu))
 693                 return -EINVAL;
 694
 695         /*
 696          * bits 15:8 should be zero in posted_intr_nv,
 697          * the descriptor address has been already checked
 698          * in nested_get_vmcs12_pages.
 699          *
 700          * bits 5:0 of posted_intr_desc_addr should be zero.
 701          */
 702         if (nested_cpu_has_posted_intr(vmcs12) &&
 703            (!nested_cpu_has_vid(vmcs12) ||
 704             !nested_exit_intr_ack_set(vcpu) ||
 705             (vmcs12->posted_intr_nv & 0xff00) ||
 706             (vmcs12->posted_intr_desc_addr & 0x3f) ||
 707             (vmcs12->posted_intr_desc_addr >> cpuid_maxphyaddr(vcpu))))
 708                 return -EINVAL;
 709
 710         /* tpr shadow is needed by all apicv features. */
 711         if (!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW))
 712                 return -EINVAL;
 713
 714         return 0;
 715 }
 716
 717 static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
 718                                        u32 count, u64 addr)
 719 {
 720         int maxphyaddr;
 721
 722         if (count == 0)
 723                 return 0;
 724         maxphyaddr = cpuid_maxphyaddr(vcpu);
 725         if (!IS_ALIGNED(addr, 16) || addr >> maxphyaddr ||
 726             (addr + count * sizeof(struct vmx_msr_entry) - 1) >> maxphyaddr)
 727                 return -EINVAL;
 728
 729         return 0;
 730 }
 731
 732 static int nested_vmx_check_exit_msr_switch_controls(struct kvm_vcpu *vcpu,
 733                                                      struct vmcs12 *vmcs12)
 734 {
 735         if (nested_vmx_check_msr_switch(vcpu, vmcs12->vm_exit_msr_load_count,
 736                                         vmcs12->vm_exit_msr_load_addr) ||
 737             nested_vmx_check_msr_switch(vcpu, vmcs12->vm_exit_msr_store_count,
 738                                         vmcs12->vm_exit_msr_store_addr))
 739                 return -EINVAL;
 740
 741         return 0;
 742 }
 743
 744 static int nested_vmx_check_entry_msr_switch_controls(struct kvm_vcpu *vcpu,
 745                                                       struct vmcs12 *vmcs12)
 746 {
 747         if (nested_vmx_check_msr_switch(vcpu, vmcs12->vm_entry_msr_load_count,
 748                                         vmcs12->vm_entry_msr_load_addr))
 749                 return -EINVAL;
 750
 751         return 0;
 752 }
 753
 754 static int nested_vmx_check_pml_controls(struct kvm_vcpu *vcpu,
 755                                          struct vmcs12 *vmcs12)
 756 {
 757         if (!nested_cpu_has_pml(vmcs12))
 758                 return 0;
 759
 760         if (!nested_cpu_has_ept(vmcs12) ||
 761             !page_address_valid(vcpu, vmcs12->pml_address))
 762                 return -EINVAL;
 763
 764         return 0;
 765 }
 766
 767 static int nested_vmx_check_unrestricted_guest_controls(struct kvm_vcpu *vcpu,
 768                                                         struct vmcs12 *vmcs12)
 769 {
 770         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST) &&
 771             !nested_cpu_has_ept(vmcs12))
 772                 return -EINVAL;
 773         return 0;
 774 }
 775
 776 static int nested_vmx_check_mode_based_ept_exec_controls(struct kvm_vcpu *vcpu,
 777                                                          struct vmcs12 *vmcs12)
 778 {
 779         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_MODE_BASED_EPT_EXEC) &&
 780             !nested_cpu_has_ept(vmcs12))
 781                 return -EINVAL;
 782         return 0;
 783 }
 784
 785 static int nested_vmx_check_shadow_vmcs_controls(struct kvm_vcpu *vcpu,
 786                                                  struct vmcs12 *vmcs12)
 787 {
 788         if (!nested_cpu_has_shadow_vmcs(vmcs12))
 789                 return 0;
 790
 791         if (!page_address_valid(vcpu, vmcs12->vmread_bitmap) ||
 792             !page_address_valid(vcpu, vmcs12->vmwrite_bitmap))
 793                 return -EINVAL;
 794
 795         return 0;
 796 }
 797
 798 static int nested_vmx_msr_check_common(struct kvm_vcpu *vcpu,
 799                                        struct vmx_msr_entry *e)
 800 {
 801         /* x2APIC MSR accesses are not allowed */
 802         if (vcpu->arch.apic_base & X2APIC_ENABLE && e->index >> 8 == 0x8)
 803                 return -EINVAL;
 804         if (e->index == MSR_IA32_UCODE_WRITE || /* SDM Table 35-2 */
 805             e->index == MSR_IA32_UCODE_REV)
 806                 return -EINVAL;
 807         if (e->reserved != 0)
 808                 return -EINVAL;
 809         return 0;
 810 }
 811
 812 static int nested_vmx_load_msr_check(struct kvm_vcpu *vcpu,
 813                                      struct vmx_msr_entry *e)
 814 {
 815         if (e->index == MSR_FS_BASE ||
 816             e->index == MSR_GS_BASE ||
 817             e->index == MSR_IA32_SMM_MONITOR_CTL || /* SMM is not supported */
 818             nested_vmx_msr_check_common(vcpu, e))
 819                 return -EINVAL;
 820         return 0;
 821 }
 822
 823 static int nested_vmx_store_msr_check(struct kvm_vcpu *vcpu,
 824                                       struct vmx_msr_entry *e)
 825 {
 826         if (e->index == MSR_IA32_SMBASE || /* SMM is not supported */
 827             nested_vmx_msr_check_common(vcpu, e))
 828                 return -EINVAL;
 829         return 0;
 830 }
 831
 832 /*
 833  * Load guest's/host's msr at nested entry/exit.
 834  * return 0 for success, entry index for failure.
 835  */
 836 static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 837 {
 838         u32 i;
 839         struct vmx_msr_entry e;
 840         struct msr_data msr;
 841
 842         msr.host_initiated = false;
 843         for (i = 0; i < count; i++) {
 844                 if (kvm_vcpu_read_guest(vcpu, gpa + i * sizeof(e),
 845                                         &e, sizeof(e))) {
 846                         pr_debug_ratelimited(
 847                                 "%s cannot read MSR entry (%u, 0x%08llx)\n",
 848                                 __func__, i, gpa + i * sizeof(e));
 849                         goto fail;
 850                 }
 851                 if (nested_vmx_load_msr_check(vcpu, &e)) {
 852                         pr_debug_ratelimited(
 853                                 "%s check failed (%u, 0x%x, 0x%x)\n",
 854                                 __func__, i, e.index, e.reserved);
 855                         goto fail;
 856                 }
 857                 msr.index = e.index;
 858                 msr.data = e.value;
 859                 if (kvm_set_msr(vcpu, &msr)) {
 860                         pr_debug_ratelimited(
 861                                 "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
 862                                 __func__, i, e.index, e.value);
 863                         goto fail;
 864                 }
 865         }
 866         return 0;
 867 fail:
 868         return i + 1;
 869 }
 870
 871 static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 872 {
 873         u32 i;
 874         struct vmx_msr_entry e;
 875
 876         for (i = 0; i < count; i++) {
 877                 struct msr_data msr_info;
 878                 if (kvm_vcpu_read_guest(vcpu,
 879                                         gpa + i * sizeof(e),
 880                                         &e, 2 * sizeof(u32))) {
 881                         pr_debug_ratelimited(
 882                                 "%s cannot read MSR entry (%u, 0x%08llx)\n",
 883                                 __func__, i, gpa + i * sizeof(e));
 884                         return -EINVAL;
 885                 }
 886                 if (nested_vmx_store_msr_check(vcpu, &e)) {
 887                         pr_debug_ratelimited(
 888                                 "%s check failed (%u, 0x%x, 0x%x)\n",
 889                                 __func__, i, e.index, e.reserved);
 890                         return -EINVAL;
 891                 }
 892                 msr_info.host_initiated = false;
 893                 msr_info.index = e.index;
 894                 if (kvm_get_msr(vcpu, &msr_info)) {
 895                         pr_debug_ratelimited(
 896                                 "%s cannot read MSR (%u, 0x%x)\n",
 897                                 __func__, i, e.index);
 898                         return -EINVAL;
 899                 }
 900                 if (kvm_vcpu_write_guest(vcpu,
 901                                          gpa + i * sizeof(e) +
 902                                              offsetof(struct vmx_msr_entry, value),
 903                                          &msr_info.data, sizeof(msr_info.data))) {
 904                         pr_debug_ratelimited(
 905                                 "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
 906                                 __func__, i, e.index, msr_info.data);
 907                         return -EINVAL;
 908                 }
 909         }
 910         return 0;
 911 }
 912
 913 static bool nested_cr3_valid(struct kvm_vcpu *vcpu, unsigned long val)
 914 {
 915         unsigned long invalid_mask;
 916
 917         invalid_mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
 918         return (val & invalid_mask) == 0;
 919 }
 920
 921 /*
 922  * Load guest's/host's cr3 at nested entry/exit. nested_ept is true if we are
 923  * emulating VM entry into a guest with EPT enabled.
 924  * Returns 0 on success, 1 on failure. Invalid state exit qualification code
 925  * is assigned to entry_failure_code on failure.
 926  */
 927 static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool nested_ept,
 928                                u32 *entry_failure_code)
 929 {
 930         if (cr3 != kvm_read_cr3(vcpu) || (!nested_ept && pdptrs_changed(vcpu))) {
 931                 if (!nested_cr3_valid(vcpu, cr3)) {
 932                         *entry_failure_code = ENTRY_FAIL_DEFAULT;
 933                         return 1;
 934                 }
 935
 936                 /*
 937                  * If PAE paging and EPT are both on, CR3 is not used by the CPU and
 938                  * must not be dereferenced.
 939                  */
 940                 if (!is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu) &&
 941                     !nested_ept) {
 942                         if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) {
 943                                 *entry_failure_code = ENTRY_FAIL_PDPTE;
 944                                 return 1;
 945                         }
 946                 }
 947         }
 948
 949         if (!nested_ept)
 950                 kvm_mmu_new_cr3(vcpu, cr3, false);
 951
 952         vcpu->arch.cr3 = cr3;
 953         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
 954
 955         kvm_init_mmu(vcpu, false);
 956
 957         return 0;
 958 }
 959
 960 /*
 961  * Returns if KVM is able to config CPU to tag TLB entries
 962  * populated by L2 differently than TLB entries populated
 963  * by L1.
 964  *
 965  * If L1 uses EPT, then TLB entries are tagged with different EPTP.
 966  *
 967  * If L1 uses VPID and we allocated a vpid02, TLB entries are tagged
 968  * with different VPID (L1 entries are tagged with vmx->vpid
 969  * while L2 entries are tagged with vmx->nested.vpid02).
 970  */
 971 static bool nested_has_guest_tlb_tag(struct kvm_vcpu *vcpu)
 972 {
 973         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 974
 975         return nested_cpu_has_ept(vmcs12) ||
 976                (nested_cpu_has_vpid(vmcs12) && to_vmx(vcpu)->nested.vpid02);
 977 }
 978
 979 static u16 nested_get_vpid02(struct kvm_vcpu *vcpu)
 980 {
 981         struct vcpu_vmx *vmx = to_vmx(vcpu);
 982
 983         return vmx->nested.vpid02 ? vmx->nested.vpid02 : vmx->vpid;
 984 }
 985
 986
 987 static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
 988 {
 989         return fixed_bits_valid(control, low, high);
 990 }
 991
 992 static inline u64 vmx_control_msr(u32 low, u32 high)
 993 {
 994         return low | ((u64)high << 32);
 995 }
 996
 997 static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
 998 {
 999         superset &= mask;
1000         subset &= mask;
1001
1002         return (superset | subset) == superset;
1003 }
1004
1005 static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
1006 {
1007         const u64 feature_and_reserved =
1008                 /* feature (except bit 48; see below) */
1009                 BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) |
1010                 /* reserved */
1011                 BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56);
1012         u64 vmx_basic = vmx->nested.msrs.basic;
1013
1014         if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved))
1015                 return -EINVAL;
1016
1017         /*
1018          * KVM does not emulate a version of VMX that constrains physical
1019          * addresses of VMX structures (e.g. VMCS) to 32-bits.
1020          */
1021         if (data & BIT_ULL(48))
1022                 return -EINVAL;
1023
1024         if (vmx_basic_vmcs_revision_id(vmx_basic) !=
1025             vmx_basic_vmcs_revision_id(data))
1026                 return -EINVAL;
1027
1028         if (vmx_basic_vmcs_size(vmx_basic) > vmx_basic_vmcs_size(data))
1029                 return -EINVAL;
1030
1031         vmx->nested.msrs.basic = data;
1032         return 0;
1033 }
1034
1035 static int
1036 vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
1037 {
1038         u64 supported;
1039         u32 *lowp, *highp;
1040
1041         switch (msr_index) {
1042         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1043                 lowp = &vmx->nested.msrs.pinbased_ctls_low;
1044                 highp = &vmx->nested.msrs.pinbased_ctls_high;
1045                 break;
1046         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1047                 lowp = &vmx->nested.msrs.procbased_ctls_low;
1048                 highp = &vmx->nested.msrs.procbased_ctls_high;
1049                 break;
1050         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1051                 lowp = &vmx->nested.msrs.exit_ctls_low;
1052                 highp = &vmx->nested.msrs.exit_ctls_high;
1053                 break;
1054         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1055                 lowp = &vmx->nested.msrs.entry_ctls_low;
1056                 highp = &vmx->nested.msrs.entry_ctls_high;
1057                 break;
1058         case MSR_IA32_VMX_PROCBASED_CTLS2:
1059                 lowp = &vmx->nested.msrs.secondary_ctls_low;
1060                 highp = &vmx->nested.msrs.secondary_ctls_high;
1061                 break;
1062         default:
1063                 BUG();
1064         }
1065
1066         supported = vmx_control_msr(*lowp, *highp);
1067
1068         /* Check must-be-1 bits are still 1. */
1069         if (!is_bitwise_subset(data, supported, GENMASK_ULL(31, 0)))
1070                 return -EINVAL;
1071
1072         /* Check must-be-0 bits are still 0. */
1073         if (!is_bitwise_subset(supported, data, GENMASK_ULL(63, 32)))
1074                 return -EINVAL;
1075
1076         *lowp = data;
1077         *highp = data >> 32;
1078         return 0;
1079 }
1080
1081 static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
1082 {
1083         const u64 feature_and_reserved_bits =
1084                 /* feature */
1085                 BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
1086                 BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
1087                 /* reserved */
1088                 GENMASK_ULL(13, 9) | BIT_ULL(31);
1089         u64 vmx_misc;
1090
1091         vmx_misc = vmx_control_msr(vmx->nested.msrs.misc_low,
1092                                    vmx->nested.msrs.misc_high);
1093
1094         if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
1095                 return -EINVAL;
1096
1097         if ((vmx->nested.msrs.pinbased_ctls_high &
1098              PIN_BASED_VMX_PREEMPTION_TIMER) &&
1099             vmx_misc_preemption_timer_rate(data) !=
1100             vmx_misc_preemption_timer_rate(vmx_misc))
1101                 return -EINVAL;
1102
1103         if (vmx_misc_cr3_count(data) > vmx_misc_cr3_count(vmx_misc))
1104                 return -EINVAL;
1105
1106         if (vmx_misc_max_msr(data) > vmx_misc_max_msr(vmx_misc))
1107                 return -EINVAL;
1108
1109         if (vmx_misc_mseg_revid(data) != vmx_misc_mseg_revid(vmx_misc))
1110                 return -EINVAL;
1111
1112         vmx->nested.msrs.misc_low = data;
1113         vmx->nested.msrs.misc_high = data >> 32;
1114
1115         /*
1116          * If L1 has read-only VM-exit information fields, use the
1117          * less permissive vmx_vmwrite_bitmap to specify write
1118          * permissions for the shadow VMCS.
1119          */
1120         if (enable_shadow_vmcs && !nested_cpu_has_vmwrite_any_field(&vmx->vcpu))
1121                 vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap));
1122
1123         return 0;
1124 }
1125
1126 static int vmx_restore_vmx_ept_vpid_cap(struct vcpu_vmx *vmx, u64 data)
1127 {
1128         u64 vmx_ept_vpid_cap;
1129
1130         vmx_ept_vpid_cap = vmx_control_msr(vmx->nested.msrs.ept_caps,
1131                                            vmx->nested.msrs.vpid_caps);
1132
1133         /* Every bit is either reserved or a feature bit. */
1134         if (!is_bitwise_subset(vmx_ept_vpid_cap, data, -1ULL))
1135                 return -EINVAL;
1136
1137         vmx->nested.msrs.ept_caps = data;
1138         vmx->nested.msrs.vpid_caps = data >> 32;
1139         return 0;
1140 }
1141
1142 static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
1143 {
1144         u64 *msr;
1145
1146         switch (msr_index) {
1147         case MSR_IA32_VMX_CR0_FIXED0:
1148                 msr = &vmx->nested.msrs.cr0_fixed0;
1149                 break;
1150         case MSR_IA32_VMX_CR4_FIXED0:
1151                 msr = &vmx->nested.msrs.cr4_fixed0;
1152                 break;
1153         default:
1154                 BUG();
1155         }
1156
1157         /*
1158          * 1 bits (which indicates bits which "must-be-1" during VMX operation)
1159          * must be 1 in the restored value.
1160          */
1161         if (!is_bitwise_subset(data, *msr, -1ULL))
1162                 return -EINVAL;
1163
1164         *msr = data;
1165         return 0;
1166 }
1167
1168 /*
1169  * Called when userspace is restoring VMX MSRs.
1170  *
1171  * Returns 0 on success, non-0 otherwise.
1172  */
1173 int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1174 {
1175         struct vcpu_vmx *vmx = to_vmx(vcpu);
1176
1177         /*
1178          * Don't allow changes to the VMX capability MSRs while the vCPU
1179          * is in VMX operation.
1180          */
1181         if (vmx->nested.vmxon)
1182                 return -EBUSY;
1183
1184         switch (msr_index) {
1185         case MSR_IA32_VMX_BASIC:
1186                 return vmx_restore_vmx_basic(vmx, data);
1187         case MSR_IA32_VMX_PINBASED_CTLS:
1188         case MSR_IA32_VMX_PROCBASED_CTLS:
1189         case MSR_IA32_VMX_EXIT_CTLS:
1190         case MSR_IA32_VMX_ENTRY_CTLS:
1191                 /*
1192                  * The "non-true" VMX capability MSRs are generated from the
1193                  * "true" MSRs, so we do not support restoring them directly.
1194                  *
1195                  * If userspace wants to emulate VMX_BASIC[55]=0, userspace
1196                  * should restore the "true" MSRs with the must-be-1 bits
1197                  * set according to the SDM Vol 3. A.2 "RESERVED CONTROLS AND
1198                  * DEFAULT SETTINGS".
1199                  */
1200                 return -EINVAL;
1201         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1202         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1203         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1204         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1205         case MSR_IA32_VMX_PROCBASED_CTLS2:
1206                 return vmx_restore_control_msr(vmx, msr_index, data);
1207         case MSR_IA32_VMX_MISC:
1208                 return vmx_restore_vmx_misc(vmx, data);
1209         case MSR_IA32_VMX_CR0_FIXED0:
1210         case MSR_IA32_VMX_CR4_FIXED0:
1211                 return vmx_restore_fixed0_msr(vmx, msr_index, data);
1212         case MSR_IA32_VMX_CR0_FIXED1:
1213         case MSR_IA32_VMX_CR4_FIXED1:
1214                 /*
1215                  * These MSRs are generated based on the vCPU's CPUID, so we
1216                  * do not support restoring them directly.
1217                  */
1218                 return -EINVAL;
1219         case MSR_IA32_VMX_EPT_VPID_CAP:
1220                 return vmx_restore_vmx_ept_vpid_cap(vmx, data);
1221         case MSR_IA32_VMX_VMCS_ENUM:
1222                 vmx->nested.msrs.vmcs_enum = data;
1223                 return 0;
1224         default:
1225                 /*
1226                  * The rest of the VMX capability MSRs do not support restore.
1227                  */
1228                 return -EINVAL;
1229         }
1230 }
1231
1232 /* Returns 0 on success, non-0 otherwise. */
1233 int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata)
1234 {
1235         switch (msr_index) {
1236         case MSR_IA32_VMX_BASIC:
1237                 *pdata = msrs->basic;
1238                 break;
1239         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1240         case MSR_IA32_VMX_PINBASED_CTLS:
1241                 *pdata = vmx_control_msr(
1242                         msrs->pinbased_ctls_low,
1243                         msrs->pinbased_ctls_high);
1244                 if (msr_index == MSR_IA32_VMX_PINBASED_CTLS)
1245                         *pdata |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
1246                 break;
1247         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1248         case MSR_IA32_VMX_PROCBASED_CTLS:
1249                 *pdata = vmx_control_msr(
1250                         msrs->procbased_ctls_low,
1251                         msrs->procbased_ctls_high);
1252                 if (msr_index == MSR_IA32_VMX_PROCBASED_CTLS)
1253                         *pdata |= CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
1254                 break;
1255         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1256         case MSR_IA32_VMX_EXIT_CTLS:
1257                 *pdata = vmx_control_msr(
1258                         msrs->exit_ctls_low,
1259                         msrs->exit_ctls_high);
1260                 if (msr_index == MSR_IA32_VMX_EXIT_CTLS)
1261                         *pdata |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
1262                 break;
1263         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1264         case MSR_IA32_VMX_ENTRY_CTLS:
1265                 *pdata = vmx_control_msr(
1266                         msrs->entry_ctls_low,
1267                         msrs->entry_ctls_high);
1268                 if (msr_index == MSR_IA32_VMX_ENTRY_CTLS)
1269                         *pdata |= VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
1270                 break;
1271         case MSR_IA32_VMX_MISC:
1272                 *pdata = vmx_control_msr(
1273                         msrs->misc_low,
1274                         msrs->misc_high);
1275                 break;
1276         case MSR_IA32_VMX_CR0_FIXED0:
1277                 *pdata = msrs->cr0_fixed0;
1278                 break;
1279         case MSR_IA32_VMX_CR0_FIXED1:
1280                 *pdata = msrs->cr0_fixed1;
1281                 break;
1282         case MSR_IA32_VMX_CR4_FIXED0:
1283                 *pdata = msrs->cr4_fixed0;
1284                 break;
1285         case MSR_IA32_VMX_CR4_FIXED1:
1286                 *pdata = msrs->cr4_fixed1;
1287                 break;
1288         case MSR_IA32_VMX_VMCS_ENUM:
1289                 *pdata = msrs->vmcs_enum;
1290                 break;
1291         case MSR_IA32_VMX_PROCBASED_CTLS2:
1292                 *pdata = vmx_control_msr(
1293                         msrs->secondary_ctls_low,
1294                         msrs->secondary_ctls_high);
1295                 break;
1296         case MSR_IA32_VMX_EPT_VPID_CAP:
1297                 *pdata = msrs->ept_caps |
1298                         ((u64)msrs->vpid_caps << 32);
1299                 break;
1300         case MSR_IA32_VMX_VMFUNC:
1301                 *pdata = msrs->vmfunc_controls;
1302                 break;
1303         default:
1304                 return 1;
1305         }
1306
1307         return 0;
1308 }
1309
1310 /*
1311  * Copy the writable VMCS shadow fields back to the VMCS12, in case
1312  * they have been modified by the L1 guest. Note that the "read-only"
1313  * VM-exit information fields are actually writable if the vCPU is
1314  * configured to support "VMWRITE to any supported field in the VMCS."
1315  */
1316 static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx)
1317 {
1318         const u16 *fields[] = {
1319                 shadow_read_write_fields,
1320                 shadow_read_only_fields
1321         };
1322         const int max_fields[] = {
1323                 max_shadow_read_write_fields,
1324                 max_shadow_read_only_fields
1325         };
1326         int i, q;
1327         unsigned long field;
1328         u64 field_value;
1329         struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs;
1330
1331         preempt_disable();
1332
1333         vmcs_load(shadow_vmcs);
1334
1335         for (q = 0; q < ARRAY_SIZE(fields); q++) {
1336                 for (i = 0; i < max_fields[q]; i++) {
1337                         field = fields[q][i];
1338                         field_value = __vmcs_readl(field);
1339                         vmcs12_write_any(get_vmcs12(&vmx->vcpu), field, field_value);
1340                 }
1341                 /*
1342                  * Skip the VM-exit information fields if they are read-only.
1343                  */
1344                 if (!nested_cpu_has_vmwrite_any_field(&vmx->vcpu))
1345                         break;
1346         }
1347
1348         vmcs_clear(shadow_vmcs);
1349         vmcs_load(vmx->loaded_vmcs->vmcs);
1350
1351         preempt_enable();
1352 }
1353
1354 static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
1355 {
1356         const u16 *fields[] = {
1357                 shadow_read_write_fields,
1358                 shadow_read_only_fields
1359         };
1360         const int max_fields[] = {
1361                 max_shadow_read_write_fields,
1362                 max_shadow_read_only_fields
1363         };
1364         int i, q;
1365         unsigned long field;
1366         u64 field_value = 0;
1367         struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs;
1368
1369         vmcs_load(shadow_vmcs);
1370
1371         for (q = 0; q < ARRAY_SIZE(fields); q++) {
1372                 for (i = 0; i < max_fields[q]; i++) {
1373                         field = fields[q][i];
1374                         vmcs12_read_any(get_vmcs12(&vmx->vcpu), field, &field_value);
1375                         __vmcs_writel(field, field_value);
1376                 }
1377         }
1378
1379         vmcs_clear(shadow_vmcs);
1380         vmcs_load(vmx->loaded_vmcs->vmcs);
1381 }
1382
1383 static int copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx)
1384 {
1385         struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
1386         struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
1387
1388         /* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
1389         vmcs12->tpr_threshold = evmcs->tpr_threshold;
1390         vmcs12->guest_rip = evmcs->guest_rip;
1391
1392         if (unlikely(!(evmcs->hv_clean_fields &
1393                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) {
1394                 vmcs12->guest_rsp = evmcs->guest_rsp;
1395                 vmcs12->guest_rflags = evmcs->guest_rflags;
1396                 vmcs12->guest_interruptibility_info =
1397                         evmcs->guest_interruptibility_info;
1398         }
1399
1400         if (unlikely(!(evmcs->hv_clean_fields &
1401                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_PROC))) {
1402                 vmcs12->cpu_based_vm_exec_control =
1403                         evmcs->cpu_based_vm_exec_control;
1404         }
1405
1406         if (unlikely(!(evmcs->hv_clean_fields &
1407                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_PROC))) {
1408                 vmcs12->exception_bitmap = evmcs->exception_bitmap;
1409         }
1410
1411         if (unlikely(!(evmcs->hv_clean_fields &
1412                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_ENTRY))) {
1413                 vmcs12->vm_entry_controls = evmcs->vm_entry_controls;
1414         }
1415
1416         if (unlikely(!(evmcs->hv_clean_fields &
1417                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EVENT))) {
1418                 vmcs12->vm_entry_intr_info_field =
1419                         evmcs->vm_entry_intr_info_field;
1420                 vmcs12->vm_entry_exception_error_code =
1421                         evmcs->vm_entry_exception_error_code;
1422                 vmcs12->vm_entry_instruction_len =
1423                         evmcs->vm_entry_instruction_len;
1424         }
1425
1426         if (unlikely(!(evmcs->hv_clean_fields &
1427                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_GRP1))) {
1428                 vmcs12->host_ia32_pat = evmcs->host_ia32_pat;
1429                 vmcs12->host_ia32_efer = evmcs->host_ia32_efer;
1430                 vmcs12->host_cr0 = evmcs->host_cr0;
1431                 vmcs12->host_cr3 = evmcs->host_cr3;
1432                 vmcs12->host_cr4 = evmcs->host_cr4;
1433                 vmcs12->host_ia32_sysenter_esp = evmcs->host_ia32_sysenter_esp;
1434                 vmcs12->host_ia32_sysenter_eip = evmcs->host_ia32_sysenter_eip;
1435                 vmcs12->host_rip = evmcs->host_rip;
1436                 vmcs12->host_ia32_sysenter_cs = evmcs->host_ia32_sysenter_cs;
1437                 vmcs12->host_es_selector = evmcs->host_es_selector;
1438                 vmcs12->host_cs_selector = evmcs->host_cs_selector;
1439                 vmcs12->host_ss_selector = evmcs->host_ss_selector;
1440                 vmcs12->host_ds_selector = evmcs->host_ds_selector;
1441                 vmcs12->host_fs_selector = evmcs->host_fs_selector;
1442                 vmcs12->host_gs_selector = evmcs->host_gs_selector;
1443                 vmcs12->host_tr_selector = evmcs->host_tr_selector;
1444         }
1445
1446         if (unlikely(!(evmcs->hv_clean_fields &
1447                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_GRP1))) {
1448                 vmcs12->pin_based_vm_exec_control =
1449                         evmcs->pin_based_vm_exec_control;
1450                 vmcs12->vm_exit_controls = evmcs->vm_exit_controls;
1451                 vmcs12->secondary_vm_exec_control =
1452                         evmcs->secondary_vm_exec_control;
1453         }
1454
1455         if (unlikely(!(evmcs->hv_clean_fields &
1456                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_IO_BITMAP))) {
1457                 vmcs12->io_bitmap_a = evmcs->io_bitmap_a;
1458                 vmcs12->io_bitmap_b = evmcs->io_bitmap_b;
1459         }
1460
1461         if (unlikely(!(evmcs->hv_clean_fields &
1462                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP))) {
1463                 vmcs12->msr_bitmap = evmcs->msr_bitmap;
1464         }
1465
1466         if (unlikely(!(evmcs->hv_clean_fields &
1467                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2))) {
1468                 vmcs12->guest_es_base = evmcs->guest_es_base;
1469                 vmcs12->guest_cs_base = evmcs->guest_cs_base;
1470                 vmcs12->guest_ss_base = evmcs->guest_ss_base;
1471                 vmcs12->guest_ds_base = evmcs->guest_ds_base;
1472                 vmcs12->guest_fs_base = evmcs->guest_fs_base;
1473                 vmcs12->guest_gs_base = evmcs->guest_gs_base;
1474                 vmcs12->guest_ldtr_base = evmcs->guest_ldtr_base;
1475                 vmcs12->guest_tr_base = evmcs->guest_tr_base;
1476                 vmcs12->guest_gdtr_base = evmcs->guest_gdtr_base;
1477                 vmcs12->guest_idtr_base = evmcs->guest_idtr_base;
1478                 vmcs12->guest_es_limit = evmcs->guest_es_limit;
1479                 vmcs12->guest_cs_limit = evmcs->guest_cs_limit;
1480                 vmcs12->guest_ss_limit = evmcs->guest_ss_limit;
1481                 vmcs12->guest_ds_limit = evmcs->guest_ds_limit;
1482                 vmcs12->guest_fs_limit = evmcs->guest_fs_limit;
1483                 vmcs12->guest_gs_limit = evmcs->guest_gs_limit;
1484                 vmcs12->guest_ldtr_limit = evmcs->guest_ldtr_limit;
1485                 vmcs12->guest_tr_limit = evmcs->guest_tr_limit;
1486                 vmcs12->guest_gdtr_limit = evmcs->guest_gdtr_limit;
1487                 vmcs12->guest_idtr_limit = evmcs->guest_idtr_limit;
1488                 vmcs12->guest_es_ar_bytes = evmcs->guest_es_ar_bytes;
1489                 vmcs12->guest_cs_ar_bytes = evmcs->guest_cs_ar_bytes;
1490                 vmcs12->guest_ss_ar_bytes = evmcs->guest_ss_ar_bytes;
1491                 vmcs12->guest_ds_ar_bytes = evmcs->guest_ds_ar_bytes;
1492                 vmcs12->guest_fs_ar_bytes = evmcs->guest_fs_ar_bytes;
1493                 vmcs12->guest_gs_ar_bytes = evmcs->guest_gs_ar_bytes;
1494                 vmcs12->guest_ldtr_ar_bytes = evmcs->guest_ldtr_ar_bytes;
1495                 vmcs12->guest_tr_ar_bytes = evmcs->guest_tr_ar_bytes;
1496                 vmcs12->guest_es_selector = evmcs->guest_es_selector;
1497                 vmcs12->guest_cs_selector = evmcs->guest_cs_selector;
1498                 vmcs12->guest_ss_selector = evmcs->guest_ss_selector;
1499                 vmcs12->guest_ds_selector = evmcs->guest_ds_selector;
1500                 vmcs12->guest_fs_selector = evmcs->guest_fs_selector;
1501                 vmcs12->guest_gs_selector = evmcs->guest_gs_selector;
1502                 vmcs12->guest_ldtr_selector = evmcs->guest_ldtr_selector;
1503                 vmcs12->guest_tr_selector = evmcs->guest_tr_selector;
1504         }
1505
1506         if (unlikely(!(evmcs->hv_clean_fields &
1507                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP2))) {
1508                 vmcs12->tsc_offset = evmcs->tsc_offset;
1509                 vmcs12->virtual_apic_page_addr = evmcs->virtual_apic_page_addr;
1510                 vmcs12->xss_exit_bitmap = evmcs->xss_exit_bitmap;
1511         }
1512
1513         if (unlikely(!(evmcs->hv_clean_fields &
1514                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CRDR))) {
1515                 vmcs12->cr0_guest_host_mask = evmcs->cr0_guest_host_mask;
1516                 vmcs12->cr4_guest_host_mask = evmcs->cr4_guest_host_mask;
1517                 vmcs12->cr0_read_shadow = evmcs->cr0_read_shadow;
1518                 vmcs12->cr4_read_shadow = evmcs->cr4_read_shadow;
1519                 vmcs12->guest_cr0 = evmcs->guest_cr0;
1520                 vmcs12->guest_cr3 = evmcs->guest_cr3;
1521                 vmcs12->guest_cr4 = evmcs->guest_cr4;
1522                 vmcs12->guest_dr7 = evmcs->guest_dr7;
1523         }
1524
1525         if (unlikely(!(evmcs->hv_clean_fields &
1526                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_POINTER))) {
1527                 vmcs12->host_fs_base = evmcs->host_fs_base;
1528                 vmcs12->host_gs_base = evmcs->host_gs_base;
1529                 vmcs12->host_tr_base = evmcs->host_tr_base;
1530                 vmcs12->host_gdtr_base = evmcs->host_gdtr_base;
1531                 vmcs12->host_idtr_base = evmcs->host_idtr_base;
1532                 vmcs12->host_rsp = evmcs->host_rsp;
1533         }
1534
1535         if (unlikely(!(evmcs->hv_clean_fields &
1536                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_XLAT))) {
1537                 vmcs12->ept_pointer = evmcs->ept_pointer;
1538                 vmcs12->virtual_processor_id = evmcs->virtual_processor_id;
1539         }
1540
1541         if (unlikely(!(evmcs->hv_clean_fields &
1542                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1))) {
1543                 vmcs12->vmcs_link_pointer = evmcs->vmcs_link_pointer;
1544                 vmcs12->guest_ia32_debugctl = evmcs->guest_ia32_debugctl;
1545                 vmcs12->guest_ia32_pat = evmcs->guest_ia32_pat;
1546                 vmcs12->guest_ia32_efer = evmcs->guest_ia32_efer;
1547                 vmcs12->guest_pdptr0 = evmcs->guest_pdptr0;
1548                 vmcs12->guest_pdptr1 = evmcs->guest_pdptr1;
1549                 vmcs12->guest_pdptr2 = evmcs->guest_pdptr2;
1550                 vmcs12->guest_pdptr3 = evmcs->guest_pdptr3;
1551                 vmcs12->guest_pending_dbg_exceptions =
1552                         evmcs->guest_pending_dbg_exceptions;
1553                 vmcs12->guest_sysenter_esp = evmcs->guest_sysenter_esp;
1554                 vmcs12->guest_sysenter_eip = evmcs->guest_sysenter_eip;
1555                 vmcs12->guest_bndcfgs = evmcs->guest_bndcfgs;
1556                 vmcs12->guest_activity_state = evmcs->guest_activity_state;
1557                 vmcs12->guest_sysenter_cs = evmcs->guest_sysenter_cs;
1558         }
1559
1560         /*
1561          * Not used?
1562          * vmcs12->vm_exit_msr_store_addr = evmcs->vm_exit_msr_store_addr;
1563          * vmcs12->vm_exit_msr_load_addr = evmcs->vm_exit_msr_load_addr;
1564          * vmcs12->vm_entry_msr_load_addr = evmcs->vm_entry_msr_load_addr;
1565          * vmcs12->cr3_target_value0 = evmcs->cr3_target_value0;
1566          * vmcs12->cr3_target_value1 = evmcs->cr3_target_value1;
1567          * vmcs12->cr3_target_value2 = evmcs->cr3_target_value2;
1568          * vmcs12->cr3_target_value3 = evmcs->cr3_target_value3;
1569          * vmcs12->page_fault_error_code_mask =
1570          *              evmcs->page_fault_error_code_mask;
1571          * vmcs12->page_fault_error_code_match =
1572          *              evmcs->page_fault_error_code_match;
1573          * vmcs12->cr3_target_count = evmcs->cr3_target_count;
1574          * vmcs12->vm_exit_msr_store_count = evmcs->vm_exit_msr_store_count;
1575          * vmcs12->vm_exit_msr_load_count = evmcs->vm_exit_msr_load_count;
1576          * vmcs12->vm_entry_msr_load_count = evmcs->vm_entry_msr_load_count;
1577          */
1578
1579         /*
1580          * Read only fields:
1581          * vmcs12->guest_physical_address = evmcs->guest_physical_address;
1582          * vmcs12->vm_instruction_error = evmcs->vm_instruction_error;
1583          * vmcs12->vm_exit_reason = evmcs->vm_exit_reason;
1584          * vmcs12->vm_exit_intr_info = evmcs->vm_exit_intr_info;
1585          * vmcs12->vm_exit_intr_error_code = evmcs->vm_exit_intr_error_code;
1586          * vmcs12->idt_vectoring_info_field = evmcs->idt_vectoring_info_field;
1587          * vmcs12->idt_vectoring_error_code = evmcs->idt_vectoring_error_code;
1588          * vmcs12->vm_exit_instruction_len = evmcs->vm_exit_instruction_len;
1589          * vmcs12->vmx_instruction_info = evmcs->vmx_instruction_info;
1590          * vmcs12->exit_qualification = evmcs->exit_qualification;
1591          * vmcs12->guest_linear_address = evmcs->guest_linear_address;
1592          *
1593          * Not present in struct vmcs12:
1594          * vmcs12->exit_io_instruction_ecx = evmcs->exit_io_instruction_ecx;
1595          * vmcs12->exit_io_instruction_esi = evmcs->exit_io_instruction_esi;
1596          * vmcs12->exit_io_instruction_edi = evmcs->exit_io_instruction_edi;
1597          * vmcs12->exit_io_instruction_eip = evmcs->exit_io_instruction_eip;
1598          */
1599
1600         return 0;
1601 }
1602
1603 static int copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx)
1604 {
1605         struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
1606         struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
1607
1608         /*
1609          * Should not be changed by KVM:
1610          *
1611          * evmcs->host_es_selector = vmcs12->host_es_selector;
1612          * evmcs->host_cs_selector = vmcs12->host_cs_selector;
1613          * evmcs->host_ss_selector = vmcs12->host_ss_selector;
1614          * evmcs->host_ds_selector = vmcs12->host_ds_selector;
1615          * evmcs->host_fs_selector = vmcs12->host_fs_selector;
1616          * evmcs->host_gs_selector = vmcs12->host_gs_selector;
1617          * evmcs->host_tr_selector = vmcs12->host_tr_selector;
1618          * evmcs->host_ia32_pat = vmcs12->host_ia32_pat;
1619          * evmcs->host_ia32_efer = vmcs12->host_ia32_efer;
1620          * evmcs->host_cr0 = vmcs12->host_cr0;
1621          * evmcs->host_cr3 = vmcs12->host_cr3;
1622          * evmcs->host_cr4 = vmcs12->host_cr4;
1623          * evmcs->host_ia32_sysenter_esp = vmcs12->host_ia32_sysenter_esp;
1624          * evmcs->host_ia32_sysenter_eip = vmcs12->host_ia32_sysenter_eip;
1625          * evmcs->host_rip = vmcs12->host_rip;
1626          * evmcs->host_ia32_sysenter_cs = vmcs12->host_ia32_sysenter_cs;
1627          * evmcs->host_fs_base = vmcs12->host_fs_base;
1628          * evmcs->host_gs_base = vmcs12->host_gs_base;
1629          * evmcs->host_tr_base = vmcs12->host_tr_base;
1630          * evmcs->host_gdtr_base = vmcs12->host_gdtr_base;
1631          * evmcs->host_idtr_base = vmcs12->host_idtr_base;
1632          * evmcs->host_rsp = vmcs12->host_rsp;
1633          * sync_vmcs12() doesn't read these:
1634          * evmcs->io_bitmap_a = vmcs12->io_bitmap_a;
1635          * evmcs->io_bitmap_b = vmcs12->io_bitmap_b;
1636          * evmcs->msr_bitmap = vmcs12->msr_bitmap;
1637          * evmcs->ept_pointer = vmcs12->ept_pointer;
1638          * evmcs->xss_exit_bitmap = vmcs12->xss_exit_bitmap;
1639          * evmcs->vm_exit_msr_store_addr = vmcs12->vm_exit_msr_store_addr;
1640          * evmcs->vm_exit_msr_load_addr = vmcs12->vm_exit_msr_load_addr;
1641          * evmcs->vm_entry_msr_load_addr = vmcs12->vm_entry_msr_load_addr;
1642          * evmcs->cr3_target_value0 = vmcs12->cr3_target_value0;
1643          * evmcs->cr3_target_value1 = vmcs12->cr3_target_value1;
1644          * evmcs->cr3_target_value2 = vmcs12->cr3_target_value2;
1645          * evmcs->cr3_target_value3 = vmcs12->cr3_target_value3;
1646          * evmcs->tpr_threshold = vmcs12->tpr_threshold;
1647          * evmcs->virtual_processor_id = vmcs12->virtual_processor_id;
1648          * evmcs->exception_bitmap = vmcs12->exception_bitmap;
1649          * evmcs->vmcs_link_pointer = vmcs12->vmcs_link_pointer;
1650          * evmcs->pin_based_vm_exec_control = vmcs12->pin_based_vm_exec_control;
1651          * evmcs->vm_exit_controls = vmcs12->vm_exit_controls;
1652          * evmcs->secondary_vm_exec_control = vmcs12->secondary_vm_exec_control;
1653          * evmcs->page_fault_error_code_mask =
1654          *              vmcs12->page_fault_error_code_mask;
1655          * evmcs->page_fault_error_code_match =
1656          *              vmcs12->page_fault_error_code_match;
1657          * evmcs->cr3_target_count = vmcs12->cr3_target_count;
1658          * evmcs->virtual_apic_page_addr = vmcs12->virtual_apic_page_addr;
1659          * evmcs->tsc_offset = vmcs12->tsc_offset;
1660          * evmcs->guest_ia32_debugctl = vmcs12->guest_ia32_debugctl;
1661          * evmcs->cr0_guest_host_mask = vmcs12->cr0_guest_host_mask;
1662          * evmcs->cr4_guest_host_mask = vmcs12->cr4_guest_host_mask;
1663          * evmcs->cr0_read_shadow = vmcs12->cr0_read_shadow;
1664          * evmcs->cr4_read_shadow = vmcs12->cr4_read_shadow;
1665          * evmcs->vm_exit_msr_store_count = vmcs12->vm_exit_msr_store_count;
1666          * evmcs->vm_exit_msr_load_count = vmcs12->vm_exit_msr_load_count;
1667          * evmcs->vm_entry_msr_load_count = vmcs12->vm_entry_msr_load_count;
1668          *
1669          * Not present in struct vmcs12:
1670          * evmcs->exit_io_instruction_ecx = vmcs12->exit_io_instruction_ecx;
1671          * evmcs->exit_io_instruction_esi = vmcs12->exit_io_instruction_esi;
1672          * evmcs->exit_io_instruction_edi = vmcs12->exit_io_instruction_edi;
1673          * evmcs->exit_io_instruction_eip = vmcs12->exit_io_instruction_eip;
1674          */
1675
1676         evmcs->guest_es_selector = vmcs12->guest_es_selector;
1677         evmcs->guest_cs_selector = vmcs12->guest_cs_selector;
1678         evmcs->guest_ss_selector = vmcs12->guest_ss_selector;
1679         evmcs->guest_ds_selector = vmcs12->guest_ds_selector;
1680         evmcs->guest_fs_selector = vmcs12->guest_fs_selector;
1681         evmcs->guest_gs_selector = vmcs12->guest_gs_selector;
1682         evmcs->guest_ldtr_selector = vmcs12->guest_ldtr_selector;
1683         evmcs->guest_tr_selector = vmcs12->guest_tr_selector;
1684
1685         evmcs->guest_es_limit = vmcs12->guest_es_limit;
1686         evmcs->guest_cs_limit = vmcs12->guest_cs_limit;
1687         evmcs->guest_ss_limit = vmcs12->guest_ss_limit;
1688         evmcs->guest_ds_limit = vmcs12->guest_ds_limit;
1689         evmcs->guest_fs_limit = vmcs12->guest_fs_limit;
1690         evmcs->guest_gs_limit = vmcs12->guest_gs_limit;
1691         evmcs->guest_ldtr_limit = vmcs12->guest_ldtr_limit;
1692         evmcs->guest_tr_limit = vmcs12->guest_tr_limit;
1693         evmcs->guest_gdtr_limit = vmcs12->guest_gdtr_limit;
1694         evmcs->guest_idtr_limit = vmcs12->guest_idtr_limit;
1695
1696         evmcs->guest_es_ar_bytes = vmcs12->guest_es_ar_bytes;
1697         evmcs->guest_cs_ar_bytes = vmcs12->guest_cs_ar_bytes;
1698         evmcs->guest_ss_ar_bytes = vmcs12->guest_ss_ar_bytes;
1699         evmcs->guest_ds_ar_bytes = vmcs12->guest_ds_ar_bytes;
1700         evmcs->guest_fs_ar_bytes = vmcs12->guest_fs_ar_bytes;
1701         evmcs->guest_gs_ar_bytes = vmcs12->guest_gs_ar_bytes;
1702         evmcs->guest_ldtr_ar_bytes = vmcs12->guest_ldtr_ar_bytes;
1703         evmcs->guest_tr_ar_bytes = vmcs12->guest_tr_ar_bytes;
1704
1705         evmcs->guest_es_base = vmcs12->guest_es_base;
1706         evmcs->guest_cs_base = vmcs12->guest_cs_base;
1707         evmcs->guest_ss_base = vmcs12->guest_ss_base;
1708         evmcs->guest_ds_base = vmcs12->guest_ds_base;
1709         evmcs->guest_fs_base = vmcs12->guest_fs_base;
1710         evmcs->guest_gs_base = vmcs12->guest_gs_base;
1711         evmcs->guest_ldtr_base = vmcs12->guest_ldtr_base;
1712         evmcs->guest_tr_base = vmcs12->guest_tr_base;
1713         evmcs->guest_gdtr_base = vmcs12->guest_gdtr_base;
1714         evmcs->guest_idtr_base = vmcs12->guest_idtr_base;
1715
1716         evmcs->guest_ia32_pat = vmcs12->guest_ia32_pat;
1717         evmcs->guest_ia32_efer = vmcs12->guest_ia32_efer;
1718
1719         evmcs->guest_pdptr0 = vmcs12->guest_pdptr0;
1720         evmcs->guest_pdptr1 = vmcs12->guest_pdptr1;
1721         evmcs->guest_pdptr2 = vmcs12->guest_pdptr2;
1722         evmcs->guest_pdptr3 = vmcs12->guest_pdptr3;
1723
1724         evmcs->guest_pending_dbg_exceptions =
1725                 vmcs12->guest_pending_dbg_exceptions;
1726         evmcs->guest_sysenter_esp = vmcs12->guest_sysenter_esp;
1727         evmcs->guest_sysenter_eip = vmcs12->guest_sysenter_eip;
1728
1729         evmcs->guest_activity_state = vmcs12->guest_activity_state;
1730         evmcs->guest_sysenter_cs = vmcs12->guest_sysenter_cs;
1731
1732         evmcs->guest_cr0 = vmcs12->guest_cr0;
1733         evmcs->guest_cr3 = vmcs12->guest_cr3;
1734         evmcs->guest_cr4 = vmcs12->guest_cr4;
1735         evmcs->guest_dr7 = vmcs12->guest_dr7;
1736
1737         evmcs->guest_physical_address = vmcs12->guest_physical_address;
1738
1739         evmcs->vm_instruction_error = vmcs12->vm_instruction_error;
1740         evmcs->vm_exit_reason = vmcs12->vm_exit_reason;
1741         evmcs->vm_exit_intr_info = vmcs12->vm_exit_intr_info;
1742         evmcs->vm_exit_intr_error_code = vmcs12->vm_exit_intr_error_code;
1743         evmcs->idt_vectoring_info_field = vmcs12->idt_vectoring_info_field;
1744         evmcs->idt_vectoring_error_code = vmcs12->idt_vectoring_error_code;
1745         evmcs->vm_exit_instruction_len = vmcs12->vm_exit_instruction_len;
1746         evmcs->vmx_instruction_info = vmcs12->vmx_instruction_info;
1747
1748         evmcs->exit_qualification = vmcs12->exit_qualification;
1749
1750         evmcs->guest_linear_address = vmcs12->guest_linear_address;
1751         evmcs->guest_rsp = vmcs12->guest_rsp;
1752         evmcs->guest_rflags = vmcs12->guest_rflags;
1753
1754         evmcs->guest_interruptibility_info =
1755                 vmcs12->guest_interruptibility_info;
1756         evmcs->cpu_based_vm_exec_control = vmcs12->cpu_based_vm_exec_control;
1757         evmcs->vm_entry_controls = vmcs12->vm_entry_controls;
1758         evmcs->vm_entry_intr_info_field = vmcs12->vm_entry_intr_info_field;
1759         evmcs->vm_entry_exception_error_code =
1760                 vmcs12->vm_entry_exception_error_code;
1761         evmcs->vm_entry_instruction_len = vmcs12->vm_entry_instruction_len;
1762
1763         evmcs->guest_rip = vmcs12->guest_rip;
1764
1765         evmcs->guest_bndcfgs = vmcs12->guest_bndcfgs;
1766
1767         return 0;
1768 }
1769
1770 /*
1771  * This is an equivalent of the nested hypervisor executing the vmptrld
1772  * instruction.
1773  */
1774 static int nested_vmx_handle_enlightened_vmptrld(struct kvm_vcpu *vcpu,
1775                                                  bool from_launch)
1776 {
1777         struct vcpu_vmx *vmx = to_vmx(vcpu);
1778         struct hv_vp_assist_page assist_page;
1779
1780         if (likely(!vmx->nested.enlightened_vmcs_enabled))
1781                 return 1;
1782
1783         if (unlikely(!kvm_hv_get_assist_page(vcpu, &assist_page)))
1784                 return 1;
1785
1786         if (unlikely(!assist_page.enlighten_vmentry))
1787                 return 1;
1788
1789         if (unlikely(assist_page.current_nested_vmcs !=
1790                      vmx->nested.hv_evmcs_vmptr)) {
1791
1792                 if (!vmx->nested.hv_evmcs)
1793                         vmx->nested.current_vmptr = -1ull;
1794
1795                 nested_release_evmcs(vcpu);
1796
1797                 vmx->nested.hv_evmcs_page = kvm_vcpu_gpa_to_page(
1798                         vcpu, assist_page.current_nested_vmcs);
1799
1800                 if (unlikely(is_error_page(vmx->nested.hv_evmcs_page)))
1801                         return 0;
1802
1803                 vmx->nested.hv_evmcs = kmap(vmx->nested.hv_evmcs_page);
1804
1805                 /*
1806                  * Currently, KVM only supports eVMCS version 1
1807                  * (== KVM_EVMCS_VERSION) and thus we expect guest to set this
1808                  * value to first u32 field of eVMCS which should specify eVMCS
1809                  * VersionNumber.
1810                  *
1811                  * Guest should be aware of supported eVMCS versions by host by
1812                  * examining CPUID.0x4000000A.EAX[0:15]. Host userspace VMM is
1813                  * expected to set this CPUID leaf according to the value
1814                  * returned in vmcs_version from nested_enable_evmcs().
1815                  *
1816                  * However, it turns out that Microsoft Hyper-V fails to comply
1817                  * to their own invented interface: When Hyper-V use eVMCS, it
1818                  * just sets first u32 field of eVMCS to revision_id specified
1819                  * in MSR_IA32_VMX_BASIC. Instead of used eVMCS version number
1820                  * which is one of the supported versions specified in
1821                  * CPUID.0x4000000A.EAX[0:15].
1822                  *
1823                  * To overcome Hyper-V bug, we accept here either a supported
1824                  * eVMCS version or VMCS12 revision_id as valid values for first
1825                  * u32 field of eVMCS.
1826                  */
1827                 if ((vmx->nested.hv_evmcs->revision_id != KVM_EVMCS_VERSION) &&
1828                     (vmx->nested.hv_evmcs->revision_id != VMCS12_REVISION)) {
1829                         nested_release_evmcs(vcpu);
1830                         return 0;
1831                 }
1832
1833                 vmx->nested.dirty_vmcs12 = true;
1834                 /*
1835                  * As we keep L2 state for one guest only 'hv_clean_fields' mask
1836                  * can't be used when we switch between them. Reset it here for
1837                  * simplicity.
1838                  */
1839                 vmx->nested.hv_evmcs->hv_clean_fields &=
1840                         ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
1841                 vmx->nested.hv_evmcs_vmptr = assist_page.current_nested_vmcs;
1842
1843                 /*
1844                  * Unlike normal vmcs12, enlightened vmcs12 is not fully
1845                  * reloaded from guest's memory (read only fields, fields not
1846                  * present in struct hv_enlightened_vmcs, ...). Make sure there
1847                  * are no leftovers.
1848                  */
1849                 if (from_launch) {
1850                         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1851                         memset(vmcs12, 0, sizeof(*vmcs12));
1852                         vmcs12->hdr.revision_id = VMCS12_REVISION;
1853                 }
1854
1855         }
1856         return 1;
1857 }
1858
1859 void nested_sync_from_vmcs12(struct kvm_vcpu *vcpu)
1860 {
1861         struct vcpu_vmx *vmx = to_vmx(vcpu);
1862
1863         /*
1864          * hv_evmcs may end up being not mapped after migration (when
1865          * L2 was running), map it here to make sure vmcs12 changes are
1866          * properly reflected.
1867          */
1868         if (vmx->nested.enlightened_vmcs_enabled && !vmx->nested.hv_evmcs)
1869                 nested_vmx_handle_enlightened_vmptrld(vcpu, false);
1870
1871         if (vmx->nested.hv_evmcs) {
1872                 copy_vmcs12_to_enlightened(vmx);
1873                 /* All fields are clean */
1874                 vmx->nested.hv_evmcs->hv_clean_fields |=
1875                         HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
1876         } else {
1877                 copy_vmcs12_to_shadow(vmx);
1878         }
1879
1880         vmx->nested.need_vmcs12_sync = false;
1881 }
1882
1883 static enum hrtimer_restart vmx_preemption_timer_fn(struct hrtimer *timer)
1884 {
1885         struct vcpu_vmx *vmx =
1886                 container_of(timer, struct vcpu_vmx, nested.preemption_timer);
1887
1888         vmx->nested.preemption_timer_expired = true;
1889         kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
1890         kvm_vcpu_kick(&vmx->vcpu);
1891
1892         return HRTIMER_NORESTART;
1893 }
1894
1895 static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu)
1896 {
1897         u64 preemption_timeout = get_vmcs12(vcpu)->vmx_preemption_timer_value;
1898         struct vcpu_vmx *vmx = to_vmx(vcpu);
1899
1900         /*
1901          * A timer value of zero is architecturally guaranteed to cause
1902          * a VMExit prior to executing any instructions in the guest.
1903          */
1904         if (preemption_timeout == 0) {
1905                 vmx_preemption_timer_fn(&vmx->nested.preemption_timer);
1906                 return;
1907         }
1908
1909         if (vcpu->arch.virtual_tsc_khz == 0)
1910                 return;
1911
1912         preemption_timeout <<= VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
1913         preemption_timeout *= 1000000;
1914         do_div(preemption_timeout, vcpu->arch.virtual_tsc_khz);
1915         hrtimer_start(&vmx->nested.preemption_timer,
1916                       ns_to_ktime(preemption_timeout), HRTIMER_MODE_REL);
1917 }
1918
1919 static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
1920 {
1921         if (vmx->nested.nested_run_pending &&
1922             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER))
1923                 return vmcs12->guest_ia32_efer;
1924         else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE)
1925                 return vmx->vcpu.arch.efer | (EFER_LMA | EFER_LME);
1926         else
1927                 return vmx->vcpu.arch.efer & ~(EFER_LMA | EFER_LME);
1928 }
1929
1930 static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
1931 {
1932         /*
1933          * If vmcs02 hasn't been initialized, set the constant vmcs02 state
1934          * according to L0's settings (vmcs12 is irrelevant here).  Host
1935          * fields that come from L0 and are not constant, e.g. HOST_CR3,
1936          * will be set as needed prior to VMLAUNCH/VMRESUME.
1937          */
1938         if (vmx->nested.vmcs02_initialized)
1939                 return;
1940         vmx->nested.vmcs02_initialized = true;
1941
1942         /*
1943          * We don't care what the EPTP value is we just need to guarantee
1944          * it's valid so we don't get a false positive when doing early
1945          * consistency checks.
1946          */
1947         if (enable_ept && nested_early_check)
1948                 vmcs_write64(EPT_POINTER, construct_eptp(&vmx->vcpu, 0));
1949
1950         /* All VMFUNCs are currently emulated through L0 vmexits.  */
1951         if (cpu_has_vmx_vmfunc())
1952                 vmcs_write64(VM_FUNCTION_CONTROL, 0);
1953
1954         if (cpu_has_vmx_posted_intr())
1955                 vmcs_write16(POSTED_INTR_NV, POSTED_INTR_NESTED_VECTOR);
1956
1957         if (cpu_has_vmx_msr_bitmap())
1958                 vmcs_write64(MSR_BITMAP, __pa(vmx->nested.vmcs02.msr_bitmap));
1959
1960         if (enable_pml)
1961                 vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg));
1962
1963         /*
1964          * Set the MSR load/store lists to match L0's settings.  Only the
1965          * addresses are constant (for vmcs02), the counts can change based
1966          * on L2's behavior, e.g. switching to/from long mode.
1967          */
1968         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
1969         vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host.val));
1970         vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest.val));
1971
1972         vmx_set_constant_host_state(vmx);
1973 }
1974
1975 static void prepare_vmcs02_early_full(struct vcpu_vmx *vmx,
1976                                       struct vmcs12 *vmcs12)
1977 {
1978         prepare_vmcs02_constant_state(vmx);
1979
1980         vmcs_write64(VMCS_LINK_POINTER, -1ull);
1981
1982         if (enable_vpid) {
1983                 if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02)
1984                         vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->nested.vpid02);
1985                 else
1986                         vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
1987         }
1988 }
1989
1990 static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
1991 {
1992         u32 exec_control, vmcs12_exec_ctrl;
1993         u64 guest_efer = nested_vmx_calc_efer(vmx, vmcs12);
1994
1995         if (vmx->nested.dirty_vmcs12 || vmx->nested.hv_evmcs)
1996                 prepare_vmcs02_early_full(vmx, vmcs12);
1997
1998         /*
1999          * PIN CONTROLS
2000          */
2001         exec_control = vmcs12->pin_based_vm_exec_control;
2002
2003         /* Preemption timer setting is computed directly in vmx_vcpu_run.  */
2004         exec_control |= vmcs_config.pin_based_exec_ctrl;
2005         exec_control &= ~PIN_BASED_VMX_PREEMPTION_TIMER;
2006         vmx->loaded_vmcs->hv_timer_armed = false;
2007
2008         /* Posted interrupts setting is only taken from vmcs12.  */
2009         if (nested_cpu_has_posted_intr(vmcs12)) {
2010                 vmx->nested.posted_intr_nv = vmcs12->posted_intr_nv;
2011                 vmx->nested.pi_pending = false;
2012         } else {
2013                 exec_control &= ~PIN_BASED_POSTED_INTR;
2014         }
2015         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, exec_control);
2016
2017         /*
2018          * EXEC CONTROLS
2019          */
2020         exec_control = vmx_exec_control(vmx); /* L0's desires */
2021         exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
2022         exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
2023         exec_control &= ~CPU_BASED_TPR_SHADOW;
2024         exec_control |= vmcs12->cpu_based_vm_exec_control;
2025
2026         /*
2027          * Write an illegal value to VIRTUAL_APIC_PAGE_ADDR. Later, if
2028          * nested_get_vmcs12_pages can't fix it up, the illegal value
2029          * will result in a VM entry failure.
2030          */
2031         if (exec_control & CPU_BASED_TPR_SHADOW) {
2032                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, -1ull);
2033                 vmcs_write32(TPR_THRESHOLD, vmcs12->tpr_threshold);
2034         } else {
2035 #ifdef CONFIG_X86_64
2036                 exec_control |= CPU_BASED_CR8_LOAD_EXITING |
2037                                 CPU_BASED_CR8_STORE_EXITING;
2038 #endif
2039         }
2040
2041         /*
2042          * A vmexit (to either L1 hypervisor or L0 userspace) is always needed
2043          * for I/O port accesses.
2044          */
2045         exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
2046         exec_control |= CPU_BASED_UNCOND_IO_EXITING;
2047         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
2048
2049         /*
2050          * SECONDARY EXEC CONTROLS
2051          */
2052         if (cpu_has_secondary_exec_ctrls()) {
2053                 exec_control = vmx->secondary_exec_control;
2054
2055                 /* Take the following fields only from vmcs12 */
2056                 exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2057                                   SECONDARY_EXEC_ENABLE_INVPCID |
2058                                   SECONDARY_EXEC_RDTSCP |
2059                                   SECONDARY_EXEC_XSAVES |
2060                                   SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
2061                                   SECONDARY_EXEC_APIC_REGISTER_VIRT |
2062                                   SECONDARY_EXEC_ENABLE_VMFUNC);
2063                 if (nested_cpu_has(vmcs12,
2064                                    CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)) {
2065                         vmcs12_exec_ctrl = vmcs12->secondary_vm_exec_control &
2066                                 ~SECONDARY_EXEC_ENABLE_PML;
2067                         exec_control |= vmcs12_exec_ctrl;
2068                 }
2069
2070                 /* VMCS shadowing for L2 is emulated for now */
2071                 exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
2072
2073                 if (exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)
2074                         vmcs_write16(GUEST_INTR_STATUS,
2075                                 vmcs12->guest_intr_status);
2076
2077                 /*
2078                  * Write an illegal value to APIC_ACCESS_ADDR. Later,
2079                  * nested_get_vmcs12_pages will either fix it up or
2080                  * remove the VM execution control.
2081                  */
2082                 if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)
2083                         vmcs_write64(APIC_ACCESS_ADDR, -1ull);
2084
2085                 if (exec_control & SECONDARY_EXEC_ENCLS_EXITING)
2086                         vmcs_write64(ENCLS_EXITING_BITMAP, -1ull);
2087
2088                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
2089         }
2090
2091         /*
2092          * ENTRY CONTROLS
2093          *
2094          * vmcs12's VM_{ENTRY,EXIT}_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE
2095          * are emulated by vmx_set_efer() in prepare_vmcs02(), but speculate
2096          * on the related bits (if supported by the CPU) in the hope that
2097          * we can avoid VMWrites during vmx_set_efer().
2098          */
2099         exec_control = (vmcs12->vm_entry_controls | vmx_vmentry_ctrl()) &
2100                         ~VM_ENTRY_IA32E_MODE & ~VM_ENTRY_LOAD_IA32_EFER;
2101         if (cpu_has_load_ia32_efer()) {
2102                 if (guest_efer & EFER_LMA)
2103                         exec_control |= VM_ENTRY_IA32E_MODE;
2104                 if (guest_efer != host_efer)
2105                         exec_control |= VM_ENTRY_LOAD_IA32_EFER;
2106         }
2107         vm_entry_controls_init(vmx, exec_control);
2108
2109         /*
2110          * EXIT CONTROLS
2111          *
2112          * L2->L1 exit controls are emulated - the hardware exit is to L0 so
2113          * we should use its exit controls. Note that VM_EXIT_LOAD_IA32_EFER
2114          * bits may be modified by vmx_set_efer() in prepare_vmcs02().
2115          */
2116         exec_control = vmx_vmexit_ctrl();
2117         if (cpu_has_load_ia32_efer() && guest_efer != host_efer)
2118                 exec_control |= VM_EXIT_LOAD_IA32_EFER;
2119         vm_exit_controls_init(vmx, exec_control);
2120
2121         /*
2122          * Conceptually we want to copy the PML address and index from
2123          * vmcs01 here, and then back to vmcs01 on nested vmexit. But,
2124          * since we always flush the log on each vmexit and never change
2125          * the PML address (once set), this happens to be equivalent to
2126          * simply resetting the index in vmcs02.
2127          */
2128         if (enable_pml)
2129                 vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1);
2130
2131         /*
2132          * Interrupt/Exception Fields
2133          */
2134         if (vmx->nested.nested_run_pending) {
2135                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2136                              vmcs12->vm_entry_intr_info_field);
2137                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
2138                              vmcs12->vm_entry_exception_error_code);
2139                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2140                              vmcs12->vm_entry_instruction_len);
2141                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
2142                              vmcs12->guest_interruptibility_info);
2143                 vmx->loaded_vmcs->nmi_known_unmasked =
2144                         !(vmcs12->guest_interruptibility_info & GUEST_INTR_STATE_NMI);
2145         } else {
2146                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
2147         }
2148 }
2149
2150 static void prepare_vmcs02_full(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
2151 {
2152         struct hv_enlightened_vmcs *hv_evmcs = vmx->nested.hv_evmcs;
2153
2154         if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
2155                            HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2)) {
2156                 vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector);
2157                 vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector);
2158                 vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector);
2159                 vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector);
2160                 vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector);
2161                 vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector);
2162                 vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector);
2163                 vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector);
2164                 vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit);
2165                 vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit);
2166                 vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit);
2167                 vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit);
2168                 vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit);
2169                 vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit);
2170                 vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit);
2171                 vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit);
2172                 vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit);
2173                 vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit);
2174                 vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes);
2175                 vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes);
2176                 vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes);
2177                 vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes);
2178                 vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes);
2179                 vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes);
2180                 vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base);
2181                 vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base);
2182                 vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base);
2183                 vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base);
2184                 vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base);
2185                 vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base);
2186                 vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base);
2187                 vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
2188                 vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
2189                 vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
2190         }
2191
2192         if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
2193                            HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1)) {
2194                 vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
2195                 vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
2196                             vmcs12->guest_pending_dbg_exceptions);
2197                 vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp);
2198                 vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip);
2199
2200                 /*
2201                  * L1 may access the L2's PDPTR, so save them to construct
2202                  * vmcs12
2203                  */
2204                 if (enable_ept) {
2205                         vmcs_write64(GUEST_PDPTR0, vmcs12->guest_pdptr0);
2206                         vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
2207                         vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
2208                         vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
2209                 }
2210         }
2211
2212         if (nested_cpu_has_xsaves(vmcs12))
2213                 vmcs_write64(XSS_EXIT_BITMAP, vmcs12->xss_exit_bitmap);
2214
2215         /*
2216          * Whether page-faults are trapped is determined by a combination of
2217          * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF.
2218          * If enable_ept, L0 doesn't care about page faults and we should
2219          * set all of these to L1's desires. However, if !enable_ept, L0 does
2220          * care about (at least some) page faults, and because it is not easy
2221          * (if at all possible?) to merge L0 and L1's desires, we simply ask
2222          * to exit on each and every L2 page fault. This is done by setting
2223          * MASK=MATCH=0 and (see below) EB.PF=1.
2224          * Note that below we don't need special code to set EB.PF beyond the
2225          * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept,
2226          * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when
2227          * !enable_ept, EB.PF is 1, so the "or" will always be 1.
2228          */
2229         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
2230                 enable_ept ? vmcs12->page_fault_error_code_mask : 0);
2231         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
2232                 enable_ept ? vmcs12->page_fault_error_code_match : 0);
2233
2234         if (cpu_has_vmx_apicv()) {
2235                 vmcs_write64(EOI_EXIT_BITMAP0, vmcs12->eoi_exit_bitmap0);
2236                 vmcs_write64(EOI_EXIT_BITMAP1, vmcs12->eoi_exit_bitmap1);
2237                 vmcs_write64(EOI_EXIT_BITMAP2, vmcs12->eoi_exit_bitmap2);
2238                 vmcs_write64(EOI_EXIT_BITMAP3, vmcs12->eoi_exit_bitmap3);
2239         }
2240
2241         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
2242         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
2243
2244         set_cr4_guest_host_mask(vmx);
2245
2246         if (kvm_mpx_supported()) {
2247                 if (vmx->nested.nested_run_pending &&
2248                         (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
2249                         vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
2250                 else
2251                         vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs);
2252         }
2253 }
2254
2255 /*
2256  * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested
2257  * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it
2258  * with L0's requirements for its guest (a.k.a. vmcs01), so we can run the L2
2259  * guest in a way that will both be appropriate to L1's requests, and our
2260  * needs. In addition to modifying the active vmcs (which is vmcs02), this
2261  * function also has additional necessary side-effects, like setting various
2262  * vcpu->arch fields.
2263  * Returns 0 on success, 1 on failure. Invalid state exit qualification code
2264  * is assigned to entry_failure_code on failure.
2265  */
2266 static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
2267                           u32 *entry_failure_code)
2268 {
2269         struct vcpu_vmx *vmx = to_vmx(vcpu);
2270         struct hv_enlightened_vmcs *hv_evmcs = vmx->nested.hv_evmcs;
2271
2272         if (vmx->nested.dirty_vmcs12 || vmx->nested.hv_evmcs) {
2273                 prepare_vmcs02_full(vmx, vmcs12);
2274                 vmx->nested.dirty_vmcs12 = false;
2275         }
2276
2277         /*
2278          * First, the fields that are shadowed.  This must be kept in sync
2279          * with vmcs_shadow_fields.h.
2280          */
2281         if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
2282                            HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2)) {
2283                 vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes);
2284                 vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes);
2285         }
2286
2287         if (vmx->nested.nested_run_pending &&
2288             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) {
2289                 kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
2290                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
2291         } else {
2292                 kvm_set_dr(vcpu, 7, vcpu->arch.dr7);
2293                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.vmcs01_debugctl);
2294         }
2295         vmx_set_rflags(vcpu, vmcs12->guest_rflags);
2296
2297         /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the
2298          * bitwise-or of what L1 wants to trap for L2, and what we want to
2299          * trap. Note that CR0.TS also needs updating - we do this later.
2300          */
2301         update_exception_bitmap(vcpu);
2302         vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask;
2303         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
2304
2305         if (vmx->nested.nested_run_pending &&
2306             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)) {
2307                 vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
2308                 vcpu->arch.pat = vmcs12->guest_ia32_pat;
2309         } else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2310                 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
2311         }
2312
2313         vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
2314
2315         if (kvm_has_tsc_control)
2316                 decache_tsc_multiplier(vmx);
2317
2318         if (enable_vpid) {
2319                 /*
2320                  * There is no direct mapping between vpid02 and vpid12, the
2321                  * vpid02 is per-vCPU for L0 and reused while the value of
2322                  * vpid12 is changed w/ one invvpid during nested vmentry.
2323                  * The vpid12 is allocated by L1 for L2, so it will not
2324                  * influence global bitmap(for vpid01 and vpid02 allocation)
2325                  * even if spawn a lot of nested vCPUs.
2326                  */
2327                 if (nested_cpu_has_vpid(vmcs12) && nested_has_guest_tlb_tag(vcpu)) {
2328                         if (vmcs12->virtual_processor_id != vmx->nested.last_vpid) {
2329                                 vmx->nested.last_vpid = vmcs12->virtual_processor_id;
2330                                 __vmx_flush_tlb(vcpu, nested_get_vpid02(vcpu), false);
2331                         }
2332                 } else {
2333                         /*
2334                          * If L1 use EPT, then L0 needs to execute INVEPT on
2335                          * EPTP02 instead of EPTP01. Therefore, delay TLB
2336                          * flush until vmcs02->eptp is fully updated by
2337                          * KVM_REQ_LOAD_CR3. Note that this assumes
2338                          * KVM_REQ_TLB_FLUSH is evaluated after
2339                          * KVM_REQ_LOAD_CR3 in vcpu_enter_guest().
2340                          */
2341                         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
2342                 }
2343         }
2344
2345         if (nested_cpu_has_ept(vmcs12))
2346                 nested_ept_init_mmu_context(vcpu);
2347         else if (nested_cpu_has2(vmcs12,
2348                                  SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
2349                 vmx_flush_tlb(vcpu, true);
2350
2351         /*
2352          * This sets GUEST_CR0 to vmcs12->guest_cr0, possibly modifying those
2353          * bits which we consider mandatory enabled.
2354          * The CR0_READ_SHADOW is what L2 should have expected to read given
2355          * the specifications by L1; It's not enough to take
2356          * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we
2357          * have more bits than L1 expected.
2358          */
2359         vmx_set_cr0(vcpu, vmcs12->guest_cr0);
2360         vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
2361
2362         vmx_set_cr4(vcpu, vmcs12->guest_cr4);
2363         vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12));
2364
2365         vcpu->arch.efer = nested_vmx_calc_efer(vmx, vmcs12);
2366         /* Note: may modify VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */
2367         vmx_set_efer(vcpu, vcpu->arch.efer);
2368
2369         /*
2370          * Guest state is invalid and unrestricted guest is disabled,
2371          * which means L1 attempted VMEntry to L2 with invalid state.
2372          * Fail the VMEntry.
2373          */
2374         if (vmx->emulation_required) {
2375                 *entry_failure_code = ENTRY_FAIL_DEFAULT;
2376                 return 1;
2377         }
2378
2379         /* Shadow page tables on either EPT or shadow page tables. */
2380         if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12),
2381                                 entry_failure_code))
2382                 return 1;
2383
2384         if (!enable_ept)
2385                 vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
2386
2387         kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
2388         kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip);
2389         return 0;
2390 }
2391
2392 static int nested_vmx_check_nmi_controls(struct vmcs12 *vmcs12)
2393 {
2394         if (!nested_cpu_has_nmi_exiting(vmcs12) &&
2395             nested_cpu_has_virtual_nmis(vmcs12))
2396                 return -EINVAL;
2397
2398         if (!nested_cpu_has_virtual_nmis(vmcs12) &&
2399             nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING))
2400                 return -EINVAL;
2401
2402         return 0;
2403 }
2404
2405 static bool valid_ept_address(struct kvm_vcpu *vcpu, u64 address)
2406 {
2407         struct vcpu_vmx *vmx = to_vmx(vcpu);
2408         int maxphyaddr = cpuid_maxphyaddr(vcpu);
2409
2410         /* Check for memory type validity */
2411         switch (address & VMX_EPTP_MT_MASK) {
2412         case VMX_EPTP_MT_UC:
2413                 if (!(vmx->nested.msrs.ept_caps & VMX_EPTP_UC_BIT))
2414                         return false;
2415                 break;
2416         case VMX_EPTP_MT_WB:
2417                 if (!(vmx->nested.msrs.ept_caps & VMX_EPTP_WB_BIT))
2418                         return false;
2419                 break;
2420         default:
2421                 return false;
2422         }
2423
2424         /* only 4 levels page-walk length are valid */
2425         if ((address & VMX_EPTP_PWL_MASK) != VMX_EPTP_PWL_4)
2426                 return false;
2427
2428         /* Reserved bits should not be set */
2429         if (address >> maxphyaddr || ((address >> 7) & 0x1f))
2430                 return false;
2431
2432         /* AD, if set, should be supported */
2433         if (address & VMX_EPTP_AD_ENABLE_BIT) {
2434                 if (!(vmx->nested.msrs.ept_caps & VMX_EPT_AD_BIT))
2435                         return false;
2436         }
2437
2438         return true;
2439 }
2440
2441 /*
2442  * Checks related to VM-Execution Control Fields
2443  */
2444 static int nested_check_vm_execution_controls(struct kvm_vcpu *vcpu,
2445                                               struct vmcs12 *vmcs12)
2446 {
2447         struct vcpu_vmx *vmx = to_vmx(vcpu);
2448
2449         if (!vmx_control_verify(vmcs12->pin_based_vm_exec_control,
2450                                 vmx->nested.msrs.pinbased_ctls_low,
2451                                 vmx->nested.msrs.pinbased_ctls_high) ||
2452             !vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
2453                                 vmx->nested.msrs.procbased_ctls_low,
2454                                 vmx->nested.msrs.procbased_ctls_high))
2455                 return -EINVAL;
2456
2457         if (nested_cpu_has(vmcs12, CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
2458             !vmx_control_verify(vmcs12->secondary_vm_exec_control,
2459                                  vmx->nested.msrs.secondary_ctls_low,
2460                                  vmx->nested.msrs.secondary_ctls_high))
2461                 return -EINVAL;
2462
2463         if (vmcs12->cr3_target_count > nested_cpu_vmx_misc_cr3_count(vcpu) ||
2464             nested_vmx_check_io_bitmap_controls(vcpu, vmcs12) ||
2465             nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12) ||
2466             nested_vmx_check_tpr_shadow_controls(vcpu, vmcs12) ||
2467             nested_vmx_check_apic_access_controls(vcpu, vmcs12) ||
2468             nested_vmx_check_apicv_controls(vcpu, vmcs12) ||
2469             nested_vmx_check_nmi_controls(vmcs12) ||
2470             nested_vmx_check_pml_controls(vcpu, vmcs12) ||
2471             nested_vmx_check_unrestricted_guest_controls(vcpu, vmcs12) ||
2472             nested_vmx_check_mode_based_ept_exec_controls(vcpu, vmcs12) ||
2473             nested_vmx_check_shadow_vmcs_controls(vcpu, vmcs12) ||
2474             (nested_cpu_has_vpid(vmcs12) && !vmcs12->virtual_processor_id))
2475                 return -EINVAL;
2476
2477         if (!nested_cpu_has_preemption_timer(vmcs12) &&
2478             nested_cpu_has_save_preemption_timer(vmcs12))
2479                 return -EINVAL;
2480
2481         if (nested_cpu_has_ept(vmcs12) &&
2482             !valid_ept_address(vcpu, vmcs12->ept_pointer))
2483                 return -EINVAL;
2484
2485         if (nested_cpu_has_vmfunc(vmcs12)) {
2486                 if (vmcs12->vm_function_control &
2487                     ~vmx->nested.msrs.vmfunc_controls)
2488                         return -EINVAL;
2489
2490                 if (nested_cpu_has_eptp_switching(vmcs12)) {
2491                         if (!nested_cpu_has_ept(vmcs12) ||
2492                             !page_address_valid(vcpu, vmcs12->eptp_list_address))
2493                                 return -EINVAL;
2494                 }
2495         }
2496
2497         return 0;
2498 }
2499
2500 /*
2501  * Checks related to VM-Exit Control Fields
2502  */
2503 static int nested_check_vm_exit_controls(struct kvm_vcpu *vcpu,
2504                                          struct vmcs12 *vmcs12)
2505 {
2506         struct vcpu_vmx *vmx = to_vmx(vcpu);
2507
2508         if (!vmx_control_verify(vmcs12->vm_exit_controls,
2509                                 vmx->nested.msrs.exit_ctls_low,
2510                                 vmx->nested.msrs.exit_ctls_high) ||
2511             nested_vmx_check_exit_msr_switch_controls(vcpu, vmcs12))
2512                 return -EINVAL;
2513
2514         return 0;
2515 }
2516
2517 /*
2518  * Checks related to VM-Entry Control Fields
2519  */
2520 static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu,
2521                                           struct vmcs12 *vmcs12)
2522 {
2523         struct vcpu_vmx *vmx = to_vmx(vcpu);
2524
2525         if (!vmx_control_verify(vmcs12->vm_entry_controls,
2526                                 vmx->nested.msrs.entry_ctls_low,
2527                                 vmx->nested.msrs.entry_ctls_high))
2528                 return -EINVAL;
2529
2530         /*
2531          * From the Intel SDM, volume 3:
2532          * Fields relevant to VM-entry event injection must be set properly.
2533          * These fields are the VM-entry interruption-information field, the
2534          * VM-entry exception error code, and the VM-entry instruction length.
2535          */
2536         if (vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) {
2537                 u32 intr_info = vmcs12->vm_entry_intr_info_field;
2538                 u8 vector = intr_info & INTR_INFO_VECTOR_MASK;
2539                 u32 intr_type = intr_info & INTR_INFO_INTR_TYPE_MASK;
2540                 bool has_error_code = intr_info & INTR_INFO_DELIVER_CODE_MASK;
2541                 bool should_have_error_code;
2542                 bool urg = nested_cpu_has2(vmcs12,
2543                                            SECONDARY_EXEC_UNRESTRICTED_GUEST);
2544                 bool prot_mode = !urg || vmcs12->guest_cr0 & X86_CR0_PE;
2545
2546                 /* VM-entry interruption-info field: interruption type */
2547                 if (intr_type == INTR_TYPE_RESERVED ||
2548                     (intr_type == INTR_TYPE_OTHER_EVENT &&
2549                      !nested_cpu_supports_monitor_trap_flag(vcpu)))
2550                         return -EINVAL;
2551
2552                 /* VM-entry interruption-info field: vector */
2553                 if ((intr_type == INTR_TYPE_NMI_INTR && vector != NMI_VECTOR) ||
2554                     (intr_type == INTR_TYPE_HARD_EXCEPTION && vector > 31) ||
2555                     (intr_type == INTR_TYPE_OTHER_EVENT && vector != 0))
2556                         return -EINVAL;
2557
2558                 /* VM-entry interruption-info field: deliver error code */
2559                 should_have_error_code =
2560                         intr_type == INTR_TYPE_HARD_EXCEPTION && prot_mode &&
2561                         x86_exception_has_error_code(vector);
2562                 if (has_error_code != should_have_error_code)
2563                         return -EINVAL;
2564
2565                 /* VM-entry exception error code */
2566                 if (has_error_code &&
2567                     vmcs12->vm_entry_exception_error_code & GENMASK(31, 15))
2568                         return -EINVAL;
2569
2570                 /* VM-entry interruption-info field: reserved bits */
2571                 if (intr_info & INTR_INFO_RESVD_BITS_MASK)
2572                         return -EINVAL;
2573
2574                 /* VM-entry instruction length */
2575                 switch (intr_type) {
2576                 case INTR_TYPE_SOFT_EXCEPTION:
2577                 case INTR_TYPE_SOFT_INTR:
2578                 case INTR_TYPE_PRIV_SW_EXCEPTION:
2579                         if ((vmcs12->vm_entry_instruction_len > 15) ||
2580                             (vmcs12->vm_entry_instruction_len == 0 &&
2581                              !nested_cpu_has_zero_length_injection(vcpu)))
2582                                 return -EINVAL;
2583                 }
2584         }
2585
2586         if (nested_vmx_check_entry_msr_switch_controls(vcpu, vmcs12))
2587                 return -EINVAL;
2588
2589         return 0;
2590 }
2591
2592 /*
2593  * Checks related to Host Control Registers and MSRs
2594  */
2595 static int nested_check_host_control_regs(struct kvm_vcpu *vcpu,
2596                                           struct vmcs12 *vmcs12)
2597 {
2598         bool ia32e;
2599
2600         if (!nested_host_cr0_valid(vcpu, vmcs12->host_cr0) ||
2601             !nested_host_cr4_valid(vcpu, vmcs12->host_cr4) ||
2602             !nested_cr3_valid(vcpu, vmcs12->host_cr3))
2603                 return -EINVAL;
2604
2605         if (is_noncanonical_address(vmcs12->host_ia32_sysenter_esp, vcpu) ||
2606             is_noncanonical_address(vmcs12->host_ia32_sysenter_eip, vcpu))
2607                 return -EINVAL;
2608
2609         /*
2610          * If the load IA32_EFER VM-exit control is 1, bits reserved in the
2611          * IA32_EFER MSR must be 0 in the field for that register. In addition,
2612          * the values of the LMA and LME bits in the field must each be that of
2613          * the host address-space size VM-exit control.
2614          */
2615         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) {
2616                 ia32e = (vmcs12->vm_exit_controls &
2617                          VM_EXIT_HOST_ADDR_SPACE_SIZE) != 0;
2618                 if (!kvm_valid_efer(vcpu, vmcs12->host_ia32_efer) ||
2619                     ia32e != !!(vmcs12->host_ia32_efer & EFER_LMA) ||
2620                     ia32e != !!(vmcs12->host_ia32_efer & EFER_LME))
2621                         return -EINVAL;
2622         }
2623
2624         return 0;
2625 }
2626
2627 /*
2628  * Checks related to Guest Non-register State
2629  */
2630 static int nested_check_guest_non_reg_state(struct vmcs12 *vmcs12)
2631 {
2632         if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
2633             vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT)
2634                 return -EINVAL;
2635
2636         return 0;
2637 }
2638
2639 static int nested_vmx_check_vmentry_prereqs(struct kvm_vcpu *vcpu,
2640                                             struct vmcs12 *vmcs12)
2641 {
2642         if (nested_check_vm_execution_controls(vcpu, vmcs12) ||
2643             nested_check_vm_exit_controls(vcpu, vmcs12) ||
2644             nested_check_vm_entry_controls(vcpu, vmcs12))
2645                 return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
2646
2647         if (nested_check_host_control_regs(vcpu, vmcs12))
2648                 return VMXERR_ENTRY_INVALID_HOST_STATE_FIELD;
2649
2650         if (nested_check_guest_non_reg_state(vmcs12))
2651                 return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
2652
2653         return 0;
2654 }
2655
2656 static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
2657                                           struct vmcs12 *vmcs12)
2658 {
2659         int r;
2660         struct page *page;
2661         struct vmcs12 *shadow;
2662
2663         if (vmcs12->vmcs_link_pointer == -1ull)
2664                 return 0;
2665
2666         if (!page_address_valid(vcpu, vmcs12->vmcs_link_pointer))
2667                 return -EINVAL;
2668
2669         page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer);
2670         if (is_error_page(page))
2671                 return -EINVAL;
2672
2673         r = 0;
2674         shadow = kmap(page);
2675         if (shadow->hdr.revision_id != VMCS12_REVISION ||
2676             shadow->hdr.shadow_vmcs != nested_cpu_has_shadow_vmcs(vmcs12))
2677                 r = -EINVAL;
2678         kunmap(page);
2679         kvm_release_page_clean(page);
2680         return r;
2681 }
2682
2683 static int nested_vmx_check_vmentry_postreqs(struct kvm_vcpu *vcpu,
2684                                              struct vmcs12 *vmcs12,
2685                                              u32 *exit_qual)
2686 {
2687         bool ia32e;
2688
2689         *exit_qual = ENTRY_FAIL_DEFAULT;
2690
2691         if (!nested_guest_cr0_valid(vcpu, vmcs12->guest_cr0) ||
2692             !nested_guest_cr4_valid(vcpu, vmcs12->guest_cr4))
2693                 return 1;
2694
2695         if (nested_vmx_check_vmcs_link_ptr(vcpu, vmcs12)) {
2696                 *exit_qual = ENTRY_FAIL_VMCS_LINK_PTR;
2697                 return 1;
2698         }
2699
2700         /*
2701          * If the load IA32_EFER VM-entry control is 1, the following checks
2702          * are performed on the field for the IA32_EFER MSR:
2703          * - Bits reserved in the IA32_EFER MSR must be 0.
2704          * - Bit 10 (corresponding to IA32_EFER.LMA) must equal the value of
2705          *   the IA-32e mode guest VM-exit control. It must also be identical
2706          *   to bit 8 (LME) if bit 31 in the CR0 field (corresponding to
2707          *   CR0.PG) is 1.
2708          */
2709         if (to_vmx(vcpu)->nested.nested_run_pending &&
2710             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) {
2711                 ia32e = (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) != 0;
2712                 if (!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer) ||
2713                     ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA) ||
2714                     ((vmcs12->guest_cr0 & X86_CR0_PG) &&
2715                      ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME)))
2716                         return 1;
2717         }
2718
2719         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS) &&
2720                 (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) ||
2721                 (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)))
2722                         return 1;
2723
2724         return 0;
2725 }
2726
2727 static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
2728 {
2729         struct vcpu_vmx *vmx = to_vmx(vcpu);
2730         unsigned long cr3, cr4;
2731         bool vm_fail;
2732
2733         if (!nested_early_check)
2734                 return 0;
2735
2736         if (vmx->msr_autoload.host.nr)
2737                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
2738         if (vmx->msr_autoload.guest.nr)
2739                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
2740
2741         preempt_disable();
2742
2743         vmx_prepare_switch_to_guest(vcpu);
2744
2745         /*
2746          * Induce a consistency check VMExit by clearing bit 1 in GUEST_RFLAGS,
2747          * which is reserved to '1' by hardware.  GUEST_RFLAGS is guaranteed to
2748          * be written (by preparve_vmcs02()) before the "real" VMEnter, i.e.
2749          * there is no need to preserve other bits or save/restore the field.
2750          */
2751         vmcs_writel(GUEST_RFLAGS, 0);
2752
2753         cr3 = __get_current_cr3_fast();
2754         if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) {
2755                 vmcs_writel(HOST_CR3, cr3);
2756                 vmx->loaded_vmcs->host_state.cr3 = cr3;
2757         }
2758
2759         cr4 = cr4_read_shadow();
2760         if (unlikely(cr4 != vmx->loaded_vmcs->host_state.cr4)) {
2761                 vmcs_writel(HOST_CR4, cr4);
2762                 vmx->loaded_vmcs->host_state.cr4 = cr4;
2763         }
2764
2765         asm(
2766                 "sub $%c[wordsize], %%" _ASM_SP "\n\t" /* temporarily adjust RSP for CALL */
2767                 "cmp %%" _ASM_SP ", %c[host_state_rsp](%[loaded_vmcs]) \n\t"
2768                 "je 1f \n\t"
2769                 __ex("vmwrite %%" _ASM_SP ", %[HOST_RSP]") "\n\t"
2770                 "mov %%" _ASM_SP ", %c[host_state_rsp](%[loaded_vmcs]) \n\t"
2771                 "1: \n\t"
2772                 "add $%c[wordsize], %%" _ASM_SP "\n\t" /* un-adjust RSP */
2773
2774                 /* Check if vmlaunch or vmresume is needed */
2775                 "cmpb $0, %c[launched](%[loaded_vmcs])\n\t"
2776
2777                 /*
2778                  * VMLAUNCH and VMRESUME clear RFLAGS.{CF,ZF} on VM-Exit, set
2779                  * RFLAGS.CF on VM-Fail Invalid and set RFLAGS.ZF on VM-Fail
2780                  * Valid.  vmx_vmenter() directly "returns" RFLAGS, and so the
2781                  * results of VM-Enter is captured via CC_{SET,OUT} to vm_fail.
2782                  */
2783                 "call vmx_vmenter\n\t"
2784
2785                 CC_SET(be)
2786               : ASM_CALL_CONSTRAINT, CC_OUT(be) (vm_fail)
2787               : [HOST_RSP]"r"((unsigned long)HOST_RSP),
2788                 [loaded_vmcs]"r"(vmx->loaded_vmcs),
2789                 [launched]"i"(offsetof(struct loaded_vmcs, launched)),
2790                 [host_state_rsp]"i"(offsetof(struct loaded_vmcs, host_state.rsp)),
2791                 [wordsize]"i"(sizeof(ulong))
2792               : "cc", "memory"
2793         );
2794
2795         preempt_enable();
2796
2797         if (vmx->msr_autoload.host.nr)
2798                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
2799         if (vmx->msr_autoload.guest.nr)
2800                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
2801
2802         if (vm_fail) {
2803                 WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) !=
2804                              VMXERR_ENTRY_INVALID_CONTROL_FIELD);
2805                 return 1;
2806         }
2807
2808         /*
2809          * VMExit clears RFLAGS.IF and DR7, even on a consistency check.
2810          */
2811         local_irq_enable();
2812         if (hw_breakpoint_active())
2813                 set_debugreg(__this_cpu_read(cpu_dr7), 7);
2814
2815         /*
2816          * A non-failing VMEntry means we somehow entered guest mode with
2817          * an illegal RIP, and that's just the tip of the iceberg.  There
2818          * is no telling what memory has been modified or what state has
2819          * been exposed to unknown code.  Hitting this all but guarantees
2820          * a (very critical) hardware issue.
2821          */
2822         WARN_ON(!(vmcs_read32(VM_EXIT_REASON) &
2823                 VMX_EXIT_REASONS_FAILED_VMENTRY));
2824
2825         return 0;
2826 }
2827
2828 static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
2829                                                  struct vmcs12 *vmcs12);
2830
2831 static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
2832 {
2833         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
2834         struct vcpu_vmx *vmx = to_vmx(vcpu);
2835         struct page *page;
2836         u64 hpa;
2837
2838         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
2839                 /*
2840                  * Translate L1 physical address to host physical
2841                  * address for vmcs02. Keep the page pinned, so this
2842                  * physical address remains valid. We keep a reference
2843                  * to it so we can release it later.
2844                  */
2845                 if (vmx->nested.apic_access_page) { /* shouldn't happen */
2846                         kvm_release_page_dirty(vmx->nested.apic_access_page);
2847                         vmx->nested.apic_access_page = NULL;
2848                 }
2849                 page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->apic_access_addr);
2850                 /*
2851                  * If translation failed, no matter: This feature asks
2852                  * to exit when accessing the given address, and if it
2853                  * can never be accessed, this feature won't do
2854                  * anything anyway.
2855                  */
2856                 if (!is_error_page(page)) {
2857                         vmx->nested.apic_access_page = page;
2858                         hpa = page_to_phys(vmx->nested.apic_access_page);
2859                         vmcs_write64(APIC_ACCESS_ADDR, hpa);
2860                 } else {
2861                         vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL,
2862                                         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
2863                 }
2864         }
2865
2866         if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
2867                 if (vmx->nested.virtual_apic_page) { /* shouldn't happen */
2868                         kvm_release_page_dirty(vmx->nested.virtual_apic_page);
2869                         vmx->nested.virtual_apic_page = NULL;
2870                 }
2871                 page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->virtual_apic_page_addr);
2872
2873                 /*
2874                  * If translation failed, VM entry will fail because
2875                  * prepare_vmcs02 set VIRTUAL_APIC_PAGE_ADDR to -1ull.
2876                  * Failing the vm entry is _not_ what the processor
2877                  * does but it's basically the only possibility we
2878                  * have.  We could still enter the guest if CR8 load
2879                  * exits are enabled, CR8 store exits are enabled, and
2880                  * virtualize APIC access is disabled; in this case
2881                  * the processor would never use the TPR shadow and we
2882                  * could simply clear the bit from the execution
2883                  * control.  But such a configuration is useless, so
2884                  * let's keep the code simple.
2885                  */
2886                 if (!is_error_page(page)) {
2887                         vmx->nested.virtual_apic_page = page;
2888                         hpa = page_to_phys(vmx->nested.virtual_apic_page);
2889                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa);
2890                 }
2891         }
2892
2893         if (nested_cpu_has_posted_intr(vmcs12)) {
2894                 if (vmx->nested.pi_desc_page) { /* shouldn't happen */
2895                         kunmap(vmx->nested.pi_desc_page);
2896                         kvm_release_page_dirty(vmx->nested.pi_desc_page);
2897                         vmx->nested.pi_desc_page = NULL;
2898                         vmx->nested.pi_desc = NULL;
2899                         vmcs_write64(POSTED_INTR_DESC_ADDR, -1ull);
2900                 }
2901                 page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->posted_intr_desc_addr);
2902                 if (is_error_page(page))
2903                         return;
2904                 vmx->nested.pi_desc_page = page;
2905                 vmx->nested.pi_desc = kmap(vmx->nested.pi_desc_page);
2906                 vmx->nested.pi_desc =
2907                         (struct pi_desc *)((void *)vmx->nested.pi_desc +
2908                         (unsigned long)(vmcs12->posted_intr_desc_addr &
2909                         (PAGE_SIZE - 1)));
2910                 vmcs_write64(POSTED_INTR_DESC_ADDR,
2911                         page_to_phys(vmx->nested.pi_desc_page) +
2912                         (unsigned long)(vmcs12->posted_intr_desc_addr &
2913                         (PAGE_SIZE - 1)));
2914         }
2915         if (nested_vmx_prepare_msr_bitmap(vcpu, vmcs12))
2916                 vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL,
2917                               CPU_BASED_USE_MSR_BITMAPS);
2918         else
2919                 vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL,
2920                                 CPU_BASED_USE_MSR_BITMAPS);
2921 }
2922
2923 /*
2924  * Intel's VMX Instruction Reference specifies a common set of prerequisites
2925  * for running VMX instructions (except VMXON, whose prerequisites are
2926  * slightly different). It also specifies what exception to inject otherwise.
2927  * Note that many of these exceptions have priority over VM exits, so they
2928  * don't have to be checked again here.
2929  */
2930 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
2931 {
2932         if (!to_vmx(vcpu)->nested.vmxon) {
2933                 kvm_queue_exception(vcpu, UD_VECTOR);
2934                 return 0;
2935         }
2936
2937         if (vmx_get_cpl(vcpu)) {
2938                 kvm_inject_gp(vcpu, 0);
2939                 return 0;
2940         }
2941
2942         return 1;
2943 }
2944
2945 static u8 vmx_has_apicv_interrupt(struct kvm_vcpu *vcpu)
2946 {
2947         u8 rvi = vmx_get_rvi();
2948         u8 vppr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_PROCPRI);
2949
2950         return ((rvi & 0xf0) > (vppr & 0xf0));
2951 }
2952
2953 static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
2954                                    struct vmcs12 *vmcs12);
2955
2956 /*
2957  * If from_vmentry is false, this is being called from state restore (either RSM
2958  * or KVM_SET_NESTED_STATE).  Otherwise it's called from vmlaunch/vmresume.
2959 + *
2960 + * Returns:
2961 + *   0 - success, i.e. proceed with actual VMEnter
2962 + *   1 - consistency check VMExit
2963 + *  -1 - consistency check VMFail
2964  */
2965 int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, bool from_vmentry)
2966 {
2967         struct vcpu_vmx *vmx = to_vmx(vcpu);
2968         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
2969         bool evaluate_pending_interrupts;
2970         u32 exit_reason = EXIT_REASON_INVALID_STATE;
2971         u32 exit_qual;
2972
2973         evaluate_pending_interrupts = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
2974                 (CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_VIRTUAL_NMI_PENDING);
2975         if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu))
2976                 evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu);
2977
2978         if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
2979                 vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
2980         if (kvm_mpx_supported() &&
2981                 !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
2982                 vmx->nested.vmcs01_guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
2983
2984         vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02);
2985
2986         prepare_vmcs02_early(vmx, vmcs12);
2987
2988         if (from_vmentry) {
2989                 nested_get_vmcs12_pages(vcpu);
2990
2991                 if (nested_vmx_check_vmentry_hw(vcpu)) {
2992                         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
2993                         return -1;
2994                 }
2995
2996                 if (nested_vmx_check_vmentry_postreqs(vcpu, vmcs12, &exit_qual))
2997                         goto vmentry_fail_vmexit;
2998         }
2999
3000         enter_guest_mode(vcpu);
3001         if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
3002                 vcpu->arch.tsc_offset += vmcs12->tsc_offset;
3003
3004         if (prepare_vmcs02(vcpu, vmcs12, &exit_qual))
3005                 goto vmentry_fail_vmexit_guest_mode;
3006
3007         if (from_vmentry) {
3008                 exit_reason = EXIT_REASON_MSR_LOAD_FAIL;
3009                 exit_qual = nested_vmx_load_msr(vcpu,
3010                                                 vmcs12->vm_entry_msr_load_addr,
3011                                                 vmcs12->vm_entry_msr_load_count);
3012                 if (exit_qual)
3013                         goto vmentry_fail_vmexit_guest_mode;
3014         } else {
3015                 /*
3016                  * The MMU is not initialized to point at the right entities yet and
3017                  * "get pages" would need to read data from the guest (i.e. we will
3018                  * need to perform gpa to hpa translation). Request a call
3019                  * to nested_get_vmcs12_pages before the next VM-entry.  The MSRs
3020                  * have already been set at vmentry time and should not be reset.
3021                  */
3022                 kvm_make_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
3023         }
3024
3025         /*
3026          * If L1 had a pending IRQ/NMI until it executed
3027          * VMLAUNCH/VMRESUME which wasn't delivered because it was
3028          * disallowed (e.g. interrupts disabled), L0 needs to
3029          * evaluate if this pending event should cause an exit from L2
3030          * to L1 or delivered directly to L2 (e.g. In case L1 don't
3031          * intercept EXTERNAL_INTERRUPT).
3032          *
3033          * Usually this would be handled by the processor noticing an
3034          * IRQ/NMI window request, or checking RVI during evaluation of
3035          * pending virtual interrupts.  However, this setting was done
3036          * on VMCS01 and now VMCS02 is active instead. Thus, we force L0
3037          * to perform pending event evaluation by requesting a KVM_REQ_EVENT.
3038          */
3039         if (unlikely(evaluate_pending_interrupts))
3040                 kvm_make_request(KVM_REQ_EVENT, vcpu);
3041
3042         /*
3043          * Do not start the preemption timer hrtimer until after we know
3044          * we are successful, so that only nested_vmx_vmexit needs to cancel
3045          * the timer.
3046          */
3047         vmx->nested.preemption_timer_expired = false;
3048         if (nested_cpu_has_preemption_timer(vmcs12))
3049                 vmx_start_preemption_timer(vcpu);
3050
3051         /*
3052          * Note no nested_vmx_succeed or nested_vmx_fail here. At this point
3053          * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet
3054          * returned as far as L1 is concerned. It will only return (and set
3055          * the success flag) when L2 exits (see nested_vmx_vmexit()).
3056          */
3057         return 0;
3058
3059         /*
3060          * A failed consistency check that leads to a VMExit during L1's
3061          * VMEnter to L2 is a variation of a normal VMexit, as explained in
3062          * 26.7 "VM-entry failures during or after loading guest state".
3063          */
3064 vmentry_fail_vmexit_guest_mode:
3065         if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
3066                 vcpu->arch.tsc_offset -= vmcs12->tsc_offset;
3067         leave_guest_mode(vcpu);
3068
3069 vmentry_fail_vmexit:
3070         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
3071
3072         if (!from_vmentry)
3073                 return 1;
3074
3075         load_vmcs12_host_state(vcpu, vmcs12);
3076         vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY;
3077         vmcs12->exit_qualification = exit_qual;
3078         if (enable_shadow_vmcs || vmx->nested.hv_evmcs)
3079                 vmx->nested.need_vmcs12_sync = true;
3080         return 1;
3081 }
3082
3083 /*
3084  * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1
3085  * for running an L2 nested guest.
3086  */
3087 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
3088 {
3089         struct vmcs12 *vmcs12;
3090         struct vcpu_vmx *vmx = to_vmx(vcpu);
3091         u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu);
3092         int ret;
3093
3094         if (!nested_vmx_check_permission(vcpu))
3095                 return 1;
3096
3097         if (!nested_vmx_handle_enlightened_vmptrld(vcpu, true))
3098                 return 1;
3099
3100         if (!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull)
3101                 return nested_vmx_failInvalid(vcpu);
3102
3103         vmcs12 = get_vmcs12(vcpu);
3104
3105         /*
3106          * Can't VMLAUNCH or VMRESUME a shadow VMCS. Despite the fact
3107          * that there *is* a valid VMCS pointer, RFLAGS.CF is set
3108          * rather than RFLAGS.ZF, and no error number is stored to the
3109          * VM-instruction error field.
3110          */
3111         if (vmcs12->hdr.shadow_vmcs)
3112                 return nested_vmx_failInvalid(vcpu);
3113
3114         if (vmx->nested.hv_evmcs) {
3115                 copy_enlightened_to_vmcs12(vmx);
3116                 /* Enlightened VMCS doesn't have launch state */
3117                 vmcs12->launch_state = !launch;
3118         } else if (enable_shadow_vmcs) {
3119                 copy_shadow_to_vmcs12(vmx);
3120         }
3121
3122         /*
3123          * The nested entry process starts with enforcing various prerequisites
3124          * on vmcs12 as required by the Intel SDM, and act appropriately when
3125          * they fail: As the SDM explains, some conditions should cause the
3126          * instruction to fail, while others will cause the instruction to seem
3127          * to succeed, but return an EXIT_REASON_INVALID_STATE.
3128          * To speed up the normal (success) code path, we should avoid checking
3129          * for misconfigurations which will anyway be caught by the processor
3130          * when using the merged vmcs02.
3131          */
3132         if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS)
3133                 return nested_vmx_failValid(vcpu,
3134                         VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
3135
3136         if (vmcs12->launch_state == launch)
3137                 return nested_vmx_failValid(vcpu,
3138                         launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
3139                                : VMXERR_VMRESUME_NONLAUNCHED_VMCS);
3140
3141         ret = nested_vmx_check_vmentry_prereqs(vcpu, vmcs12);
3142         if (ret)
3143                 return nested_vmx_failValid(vcpu, ret);
3144
3145         /*
3146          * We're finally done with prerequisite checking, and can start with
3147          * the nested entry.
3148          */
3149         vmx->nested.nested_run_pending = 1;
3150         ret = nested_vmx_enter_non_root_mode(vcpu, true);
3151         vmx->nested.nested_run_pending = !ret;
3152         if (ret > 0)
3153                 return 1;
3154         else if (ret)
3155                 return nested_vmx_failValid(vcpu,
3156                         VMXERR_ENTRY_INVALID_CONTROL_FIELD);
3157
3158         /* Hide L1D cache contents from the nested guest.  */
3159         vmx->vcpu.arch.l1tf_flush_l1d = true;
3160
3161         /*
3162          * Must happen outside of nested_vmx_enter_non_root_mode() as it will
3163          * also be used as part of restoring nVMX state for
3164          * snapshot restore (migration).
3165          *
3166          * In this flow, it is assumed that vmcs12 cache was
3167          * trasferred as part of captured nVMX state and should
3168          * therefore not be read from guest memory (which may not
3169          * exist on destination host yet).
3170          */
3171         nested_cache_shadow_vmcs12(vcpu, vmcs12);
3172
3173         /*
3174          * If we're entering a halted L2 vcpu and the L2 vcpu won't be
3175          * awakened by event injection or by an NMI-window VM-exit or
3176          * by an interrupt-window VM-exit, halt the vcpu.
3177          */
3178         if ((vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT) &&
3179             !(vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) &&
3180             !(vmcs12->cpu_based_vm_exec_control & CPU_BASED_VIRTUAL_NMI_PENDING) &&
3181             !((vmcs12->cpu_based_vm_exec_control & CPU_BASED_VIRTUAL_INTR_PENDING) &&
3182               (vmcs12->guest_rflags & X86_EFLAGS_IF))) {
3183                 vmx->nested.nested_run_pending = 0;
3184                 return kvm_vcpu_halt(vcpu);
3185         }
3186         return 1;
3187 }
3188
3189 /*
3190  * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date
3191  * because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK).
3192  * This function returns the new value we should put in vmcs12.guest_cr0.
3193  * It's not enough to just return the vmcs02 GUEST_CR0. Rather,
3194  *  1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now
3195  *     available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0
3196  *     didn't trap the bit, because if L1 did, so would L0).
3197  *  2. Bits that L1 asked to trap (and therefore L0 also did) could not have
3198  *     been modified by L2, and L1 knows it. So just leave the old value of
3199  *     the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0
3200  *     isn't relevant, because if L0 traps this bit it can set it to anything.
3201  *  3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have
3202  *     changed these bits, and therefore they need to be updated, but L0
3203  *     didn't necessarily allow them to be changed in GUEST_CR0 - and rather
3204  *     put them in vmcs02 CR0_READ_SHADOW. So take these bits from there.
3205  */
3206 static inline unsigned long
3207 vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
3208 {
3209         return
3210         /*1*/   (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) |
3211         /*2*/   (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) |
3212         /*3*/   (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask |
3213                         vcpu->arch.cr0_guest_owned_bits));
3214 }
3215
3216 static inline unsigned long
3217 vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
3218 {
3219         return
3220         /*1*/   (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) |
3221         /*2*/   (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) |
3222         /*3*/   (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask |
3223                         vcpu->arch.cr4_guest_owned_bits));
3224 }
3225
3226 static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
3227                                       struct vmcs12 *vmcs12)
3228 {
3229         u32 idt_vectoring;
3230         unsigned int nr;
3231
3232         if (vcpu->arch.exception.injected) {
3233                 nr = vcpu->arch.exception.nr;
3234                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
3235
3236                 if (kvm_exception_is_soft(nr)) {
3237                         vmcs12->vm_exit_instruction_len =
3238                                 vcpu->arch.event_exit_inst_len;
3239                         idt_vectoring |= INTR_TYPE_SOFT_EXCEPTION;
3240                 } else
3241                         idt_vectoring |= INTR_TYPE_HARD_EXCEPTION;
3242
3243                 if (vcpu->arch.exception.has_error_code) {
3244                         idt_vectoring |= VECTORING_INFO_DELIVER_CODE_MASK;
3245                         vmcs12->idt_vectoring_error_code =
3246                                 vcpu->arch.exception.error_code;
3247                 }
3248
3249                 vmcs12->idt_vectoring_info_field = idt_vectoring;
3250         } else if (vcpu->arch.nmi_injected) {
3251                 vmcs12->idt_vectoring_info_field =
3252                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR;
3253         } else if (vcpu->arch.interrupt.injected) {
3254                 nr = vcpu->arch.interrupt.nr;
3255                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
3256
3257                 if (vcpu->arch.interrupt.soft) {
3258                         idt_vectoring |= INTR_TYPE_SOFT_INTR;
3259                         vmcs12->vm_entry_instruction_len =
3260                                 vcpu->arch.event_exit_inst_len;
3261                 } else
3262                         idt_vectoring |= INTR_TYPE_EXT_INTR;
3263
3264                 vmcs12->idt_vectoring_info_field = idt_vectoring;
3265         }
3266 }
3267
3268
3269 static void nested_mark_vmcs12_pages_dirty(struct kvm_vcpu *vcpu)
3270 {
3271         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3272         gfn_t gfn;
3273
3274         /*
3275          * Don't need to mark the APIC access page dirty; it is never
3276          * written to by the CPU during APIC virtualization.
3277          */
3278
3279         if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
3280                 gfn = vmcs12->virtual_apic_page_addr >> PAGE_SHIFT;
3281                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
3282         }
3283
3284         if (nested_cpu_has_posted_intr(vmcs12)) {
3285                 gfn = vmcs12->posted_intr_desc_addr >> PAGE_SHIFT;
3286                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
3287         }
3288 }
3289
3290 static void vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu)
3291 {
3292         struct vcpu_vmx *vmx = to_vmx(vcpu);
3293         int max_irr;
3294         void *vapic_page;
3295         u16 status;
3296
3297         if (!vmx->nested.pi_desc || !vmx->nested.pi_pending)
3298                 return;
3299
3300         vmx->nested.pi_pending = false;
3301         if (!pi_test_and_clear_on(vmx->nested.pi_desc))
3302                 return;
3303
3304         max_irr = find_last_bit((unsigned long *)vmx->nested.pi_desc->pir, 256);
3305         if (max_irr != 256) {
3306                 vapic_page = kmap(vmx->nested.virtual_apic_page);
3307                 __kvm_apic_update_irr(vmx->nested.pi_desc->pir,
3308                         vapic_page, &max_irr);
3309                 kunmap(vmx->nested.virtual_apic_page);
3310
3311                 status = vmcs_read16(GUEST_INTR_STATUS);
3312                 if ((u8)max_irr > ((u8)status & 0xff)) {
3313                         status &= ~0xff;
3314                         status |= (u8)max_irr;
3315                         vmcs_write16(GUEST_INTR_STATUS, status);
3316                 }
3317         }
3318
3319         nested_mark_vmcs12_pages_dirty(vcpu);
3320 }
3321
3322 static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu,
3323                                                unsigned long exit_qual)
3324 {
3325         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3326         unsigned int nr = vcpu->arch.exception.nr;
3327         u32 intr_info = nr | INTR_INFO_VALID_MASK;
3328
3329         if (vcpu->arch.exception.has_error_code) {
3330                 vmcs12->vm_exit_intr_error_code = vcpu->arch.exception.error_code;
3331                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
3332         }
3333
3334         if (kvm_exception_is_soft(nr))
3335                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
3336         else
3337                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
3338
3339         if (!(vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK) &&
3340             vmx_get_nmi_mask(vcpu))
3341                 intr_info |= INTR_INFO_UNBLOCK_NMI;
3342
3343         nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, intr_info, exit_qual);
3344 }
3345
3346 static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr)
3347 {
3348         struct vcpu_vmx *vmx = to_vmx(vcpu);
3349         unsigned long exit_qual;
3350         bool block_nested_events =
3351             vmx->nested.nested_run_pending || kvm_event_needs_reinjection(vcpu);
3352
3353         if (vcpu->arch.exception.pending &&
3354                 nested_vmx_check_exception(vcpu, &exit_qual)) {
3355                 if (block_nested_events)
3356                         return -EBUSY;
3357                 nested_vmx_inject_exception_vmexit(vcpu, exit_qual);
3358                 return 0;
3359         }
3360
3361         if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
3362             vmx->nested.preemption_timer_expired) {
3363                 if (block_nested_events)
3364                         return -EBUSY;
3365                 nested_vmx_vmexit(vcpu, EXIT_REASON_PREEMPTION_TIMER, 0, 0);
3366                 return 0;
3367         }
3368
3369         if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) {
3370                 if (block_nested_events)
3371                         return -EBUSY;
3372                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
3373                                   NMI_VECTOR | INTR_TYPE_NMI_INTR |
3374                                   INTR_INFO_VALID_MASK, 0);
3375                 /*
3376                  * The NMI-triggered VM exit counts as injection:
3377                  * clear this one and block further NMIs.
3378                  */
3379                 vcpu->arch.nmi_pending = 0;
3380                 vmx_set_nmi_mask(vcpu, true);
3381                 return 0;
3382         }
3383
3384         if ((kvm_cpu_has_interrupt(vcpu) || external_intr) &&
3385             nested_exit_on_intr(vcpu)) {
3386                 if (block_nested_events)
3387                         return -EBUSY;
3388                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, 0, 0);
3389                 return 0;
3390         }
3391
3392         vmx_complete_nested_posted_interrupt(vcpu);
3393         return 0;
3394 }
3395
3396 static u32 vmx_get_preemption_timer_value(struct kvm_vcpu *vcpu)
3397 {
3398         ktime_t remaining =
3399                 hrtimer_get_remaining(&to_vmx(vcpu)->nested.preemption_timer);
3400         u64 value;
3401
3402         if (ktime_to_ns(remaining) <= 0)
3403                 return 0;
3404
3405         value = ktime_to_ns(remaining) * vcpu->arch.virtual_tsc_khz;
3406         do_div(value, 1000000);
3407         return value >> VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
3408 }
3409
3410 /*
3411  * Update the guest state fields of vmcs12 to reflect changes that
3412  * occurred while L2 was running. (The "IA-32e mode guest" bit of the
3413  * VM-entry controls is also updated, since this is really a guest
3414  * state bit.)
3415  */
3416 static void sync_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
3417 {
3418         vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
3419         vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
3420
3421         vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3422         vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP);
3423         vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS);
3424
3425         vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
3426         vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
3427         vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
3428         vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
3429         vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
3430         vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
3431         vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
3432         vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
3433         vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
3434         vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
3435         vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
3436         vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
3437         vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
3438         vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
3439         vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
3440         vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
3441         vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
3442         vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
3443         vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
3444         vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
3445         vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
3446         vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
3447         vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
3448         vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
3449         vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
3450         vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
3451         vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE);
3452         vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
3453         vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
3454         vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
3455         vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
3456         vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
3457         vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
3458         vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
3459         vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
3460         vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
3461
3462         vmcs12->guest_interruptibility_info =
3463                 vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
3464         vmcs12->guest_pending_dbg_exceptions =
3465                 vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
3466         if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
3467                 vmcs12->guest_activity_state = GUEST_ACTIVITY_HLT;
3468         else
3469                 vmcs12->guest_activity_state = GUEST_ACTIVITY_ACTIVE;
3470
3471         if (nested_cpu_has_preemption_timer(vmcs12) &&
3472             vmcs12->vm_exit_controls & VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
3473                         vmcs12->vmx_preemption_timer_value =
3474                                 vmx_get_preemption_timer_value(vcpu);
3475
3476         /*
3477          * In some cases (usually, nested EPT), L2 is allowed to change its
3478          * own CR3 without exiting. If it has changed it, we must keep it.
3479          * Of course, if L0 is using shadow page tables, GUEST_CR3 was defined
3480          * by L0, not L1 or L2, so we mustn't unconditionally copy it to vmcs12.
3481          *
3482          * Additionally, restore L2's PDPTR to vmcs12.
3483          */
3484         if (enable_ept) {
3485                 vmcs12->guest_cr3 = vmcs_readl(GUEST_CR3);
3486                 vmcs12->guest_pdptr0 = vmcs_read64(GUEST_PDPTR0);
3487                 vmcs12->guest_pdptr1 = vmcs_read64(GUEST_PDPTR1);
3488                 vmcs12->guest_pdptr2 = vmcs_read64(GUEST_PDPTR2);
3489                 vmcs12->guest_pdptr3 = vmcs_read64(GUEST_PDPTR3);
3490         }
3491
3492         vmcs12->guest_linear_address = vmcs_readl(GUEST_LINEAR_ADDRESS);
3493
3494         if (nested_cpu_has_vid(vmcs12))
3495                 vmcs12->guest_intr_status = vmcs_read16(GUEST_INTR_STATUS);
3496
3497         vmcs12->vm_entry_controls =
3498                 (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) |
3499                 (vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE);
3500
3501         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) {
3502                 kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
3503                 vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
3504         }
3505
3506         /* TODO: These cannot have changed unless we have MSR bitmaps and
3507          * the relevant bit asks not to trap the change */
3508         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT)
3509                 vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
3510         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER)
3511                 vmcs12->guest_ia32_efer = vcpu->arch.efer;
3512         vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);
3513         vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP);
3514         vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
3515         if (kvm_mpx_supported())
3516                 vmcs12->guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
3517 }
3518
3519 /*
3520  * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits
3521  * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12),
3522  * and this function updates it to reflect the changes to the guest state while
3523  * L2 was running (and perhaps made some exits which were handled directly by L0
3524  * without going back to L1), and to reflect the exit reason.
3525  * Note that we do not have to copy here all VMCS fields, just those that
3526  * could have changed by the L2 guest or the exit - i.e., the guest-state and
3527  * exit-information fields only. Other fields are modified by L1 with VMWRITE,
3528  * which already writes to vmcs12 directly.
3529  */
3530 static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
3531                            u32 exit_reason, u32 exit_intr_info,
3532                            unsigned long exit_qualification)
3533 {
3534         /* update guest state fields: */
3535         sync_vmcs12(vcpu, vmcs12);
3536
3537         /* update exit information fields: */
3538
3539         vmcs12->vm_exit_reason = exit_reason;
3540         vmcs12->exit_qualification = exit_qualification;
3541         vmcs12->vm_exit_intr_info = exit_intr_info;
3542
3543         vmcs12->idt_vectoring_info_field = 0;
3544         vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3545         vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
3546
3547         if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) {
3548                 vmcs12->launch_state = 1;
3549
3550                 /* vm_entry_intr_info_field is cleared on exit. Emulate this
3551                  * instead of reading the real value. */
3552                 vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
3553
3554                 /*
3555                  * Transfer the event that L0 or L1 may wanted to inject into
3556                  * L2 to IDT_VECTORING_INFO_FIELD.
3557                  */
3558                 vmcs12_save_pending_event(vcpu, vmcs12);
3559
3560                 /*
3561                  * According to spec, there's no need to store the guest's
3562                  * MSRs if the exit is due to a VM-entry failure that occurs
3563                  * during or after loading the guest state. Since this exit
3564                  * does not fall in that category, we need to save the MSRs.
3565                  */
3566                 if (nested_vmx_store_msr(vcpu,
3567                                          vmcs12->vm_exit_msr_store_addr,
3568                                          vmcs12->vm_exit_msr_store_count))
3569                         nested_vmx_abort(vcpu,
3570                                          VMX_ABORT_SAVE_GUEST_MSR_FAIL);
3571         }
3572
3573         /*
3574          * Drop what we picked up for L2 via vmx_complete_interrupts. It is
3575          * preserved above and would only end up incorrectly in L1.
3576          */
3577         vcpu->arch.nmi_injected = false;
3578         kvm_clear_exception_queue(vcpu);
3579         kvm_clear_interrupt_queue(vcpu);
3580 }
3581
3582 /*
3583  * A part of what we need to when the nested L2 guest exits and we want to
3584  * run its L1 parent, is to reset L1's guest state to the host state specified
3585  * in vmcs12.
3586  * This function is to be called not only on normal nested exit, but also on
3587  * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry
3588  * Failures During or After Loading Guest State").
3589  * This function should be called when the active VMCS is L1's (vmcs01).
3590  */
3591 static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
3592                                    struct vmcs12 *vmcs12)
3593 {
3594         struct kvm_segment seg;
3595         u32 entry_failure_code;
3596
3597         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER)
3598                 vcpu->arch.efer = vmcs12->host_ia32_efer;
3599         else if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
3600                 vcpu->arch.efer |= (EFER_LMA | EFER_LME);
3601         else
3602                 vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
3603         vmx_set_efer(vcpu, vcpu->arch.efer);
3604
3605         kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp);
3606         kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip);
3607         vmx_set_rflags(vcpu, X86_EFLAGS_FIXED);
3608         vmx_set_interrupt_shadow(vcpu, 0);
3609
3610         /*
3611          * Note that calling vmx_set_cr0 is important, even if cr0 hasn't
3612          * actually changed, because vmx_set_cr0 refers to efer set above.
3613          *
3614          * CR0_GUEST_HOST_MASK is already set in the original vmcs01
3615          * (KVM doesn't change it);
3616          */
3617         vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
3618         vmx_set_cr0(vcpu, vmcs12->host_cr0);
3619
3620         /* Same as above - no reason to call set_cr4_guest_host_mask().  */
3621         vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
3622         vmx_set_cr4(vcpu, vmcs12->host_cr4);
3623
3624         nested_ept_uninit_mmu_context(vcpu);
3625
3626         /*
3627          * Only PDPTE load can fail as the value of cr3 was checked on entry and
3628          * couldn't have changed.
3629          */
3630         if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, &entry_failure_code))
3631                 nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_PDPTE_FAIL);
3632
3633         if (!enable_ept)
3634                 vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault;
3635
3636         /*
3637          * If vmcs01 doesn't use VPID, CPU flushes TLB on every
3638          * VMEntry/VMExit. Thus, no need to flush TLB.
3639          *
3640          * If vmcs12 doesn't use VPID, L1 expects TLB to be
3641          * flushed on every VMEntry/VMExit.
3642          *
3643          * Otherwise, we can preserve TLB entries as long as we are
3644          * able to tag L1 TLB entries differently than L2 TLB entries.
3645          *
3646          * If vmcs12 uses EPT, we need to execute this flush on EPTP01
3647          * and therefore we request the TLB flush to happen only after VMCS EPTP
3648          * has been set by KVM_REQ_LOAD_CR3.
3649          */
3650         if (enable_vpid &&
3651             (!nested_cpu_has_vpid(vmcs12) || !nested_has_guest_tlb_tag(vcpu))) {
3652                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3653         }
3654
3655         vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs);
3656         vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp);
3657         vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip);
3658         vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base);
3659         vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base);
3660         vmcs_write32(GUEST_IDTR_LIMIT, 0xFFFF);
3661         vmcs_write32(GUEST_GDTR_LIMIT, 0xFFFF);
3662
3663         /* If not VM_EXIT_CLEAR_BNDCFGS, the L2 value propagates to L1.  */
3664         if (vmcs12->vm_exit_controls & VM_EXIT_CLEAR_BNDCFGS)
3665                 vmcs_write64(GUEST_BNDCFGS, 0);
3666
3667         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) {
3668                 vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat);
3669                 vcpu->arch.pat = vmcs12->host_ia32_pat;
3670         }
3671         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
3672                 vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL,
3673                         vmcs12->host_ia32_perf_global_ctrl);
3674
3675         /* Set L1 segment info according to Intel SDM
3676             27.5.2 Loading Host Segment and Descriptor-Table Registers */
3677         seg = (struct kvm_segment) {
3678                 .base = 0,
3679                 .limit = 0xFFFFFFFF,
3680                 .selector = vmcs12->host_cs_selector,
3681                 .type = 11,
3682                 .present = 1,
3683                 .s = 1,
3684                 .g = 1
3685         };
3686         if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
3687                 seg.l = 1;
3688         else
3689                 seg.db = 1;
3690         vmx_set_segment(vcpu, &seg, VCPU_SREG_CS);
3691         seg = (struct kvm_segment) {
3692                 .base = 0,
3693                 .limit = 0xFFFFFFFF,
3694                 .type = 3,
3695                 .present = 1,
3696                 .s = 1,
3697                 .db = 1,
3698                 .g = 1
3699         };
3700         seg.selector = vmcs12->host_ds_selector;
3701         vmx_set_segment(vcpu, &seg, VCPU_SREG_DS);
3702         seg.selector = vmcs12->host_es_selector;
3703         vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
3704         seg.selector = vmcs12->host_ss_selector;
3705         vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
3706         seg.selector = vmcs12->host_fs_selector;
3707         seg.base = vmcs12->host_fs_base;
3708         vmx_set_segment(vcpu, &seg, VCPU_SREG_FS);
3709         seg.selector = vmcs12->host_gs_selector;
3710         seg.base = vmcs12->host_gs_base;
3711         vmx_set_segment(vcpu, &seg, VCPU_SREG_GS);
3712         seg = (struct kvm_segment) {
3713                 .base = vmcs12->host_tr_base,
3714                 .limit = 0x67,
3715                 .selector = vmcs12->host_tr_selector,
3716                 .type = 11,
3717                 .present = 1
3718         };
3719         vmx_set_segment(vcpu, &seg, VCPU_SREG_TR);
3720
3721         kvm_set_dr(vcpu, 7, 0x400);
3722         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
3723
3724         if (cpu_has_vmx_msr_bitmap())
3725                 vmx_update_msr_bitmap(vcpu);
3726
3727         if (nested_vmx_load_msr(vcpu, vmcs12->vm_exit_msr_load_addr,
3728                                 vmcs12->vm_exit_msr_load_count))
3729                 nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL);
3730 }
3731
3732 static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx)
3733 {
3734         struct shared_msr_entry *efer_msr;
3735         unsigned int i;
3736
3737         if (vm_entry_controls_get(vmx) & VM_ENTRY_LOAD_IA32_EFER)
3738                 return vmcs_read64(GUEST_IA32_EFER);
3739
3740         if (cpu_has_load_ia32_efer())
3741                 return host_efer;
3742
3743         for (i = 0; i < vmx->msr_autoload.guest.nr; ++i) {
3744                 if (vmx->msr_autoload.guest.val[i].index == MSR_EFER)
3745                         return vmx->msr_autoload.guest.val[i].value;
3746         }
3747
3748         efer_msr = find_msr_entry(vmx, MSR_EFER);
3749         if (efer_msr)
3750                 return efer_msr->data;
3751
3752         return host_efer;
3753 }
3754
3755 static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu)
3756 {
3757         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3758         struct vcpu_vmx *vmx = to_vmx(vcpu);
3759         struct vmx_msr_entry g, h;
3760         struct msr_data msr;
3761         gpa_t gpa;
3762         u32 i, j;
3763
3764         vcpu->arch.pat = vmcs_read64(GUEST_IA32_PAT);
3765
3766         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) {
3767                 /*
3768                  * L1's host DR7 is lost if KVM_GUESTDBG_USE_HW_BP is set
3769                  * as vmcs01.GUEST_DR7 contains a userspace defined value
3770                  * and vcpu->arch.dr7 is not squirreled away before the
3771                  * nested VMENTER (not worth adding a variable in nested_vmx).
3772                  */
3773                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
3774                         kvm_set_dr(vcpu, 7, DR7_FIXED_1);
3775                 else
3776                         WARN_ON(kvm_set_dr(vcpu, 7, vmcs_readl(GUEST_DR7)));
3777         }
3778
3779         /*
3780          * Note that calling vmx_set_{efer,cr0,cr4} is important as they
3781          * handle a variety of side effects to KVM's software model.
3782          */
3783         vmx_set_efer(vcpu, nested_vmx_get_vmcs01_guest_efer(vmx));
3784
3785         vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
3786         vmx_set_cr0(vcpu, vmcs_readl(CR0_READ_SHADOW));
3787
3788         vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
3789         vmx_set_cr4(vcpu, vmcs_readl(CR4_READ_SHADOW));
3790
3791         nested_ept_uninit_mmu_context(vcpu);
3792         vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3793         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
3794
3795         /*
3796          * Use ept_save_pdptrs(vcpu) to load the MMU's cached PDPTRs
3797          * from vmcs01 (if necessary).  The PDPTRs are not loaded on
3798          * VMFail, like everything else we just need to ensure our
3799          * software model is up-to-date.
3800          */
3801         ept_save_pdptrs(vcpu);
3802
3803         kvm_mmu_reset_context(vcpu);
3804
3805         if (cpu_has_vmx_msr_bitmap())
3806                 vmx_update_msr_bitmap(vcpu);
3807
3808         /*
3809          * This nasty bit of open coding is a compromise between blindly
3810          * loading L1's MSRs using the exit load lists (incorrect emulation
3811          * of VMFail), leaving the nested VM's MSRs in the software model
3812          * (incorrect behavior) and snapshotting the modified MSRs (too
3813          * expensive since the lists are unbound by hardware).  For each
3814          * MSR that was (prematurely) loaded from the nested VMEntry load
3815          * list, reload it from the exit load list if it exists and differs
3816          * from the guest value.  The intent is to stuff host state as
3817          * silently as possible, not to fully process the exit load list.
3818          */
3819         msr.host_initiated = false;
3820         for (i = 0; i < vmcs12->vm_entry_msr_load_count; i++) {
3821                 gpa = vmcs12->vm_entry_msr_load_addr + (i * sizeof(g));
3822                 if (kvm_vcpu_read_guest(vcpu, gpa, &g, sizeof(g))) {
3823                         pr_debug_ratelimited(
3824                                 "%s read MSR index failed (%u, 0x%08llx)\n",
3825                                 __func__, i, gpa);
3826                         goto vmabort;
3827                 }
3828
3829                 for (j = 0; j < vmcs12->vm_exit_msr_load_count; j++) {
3830                         gpa = vmcs12->vm_exit_msr_load_addr + (j * sizeof(h));
3831                         if (kvm_vcpu_read_guest(vcpu, gpa, &h, sizeof(h))) {
3832                                 pr_debug_ratelimited(
3833                                         "%s read MSR failed (%u, 0x%08llx)\n",
3834                                         __func__, j, gpa);
3835                                 goto vmabort;
3836                         }
3837                         if (h.index != g.index)
3838                                 continue;
3839                         if (h.value == g.value)
3840                                 break;
3841
3842                         if (nested_vmx_load_msr_check(vcpu, &h)) {
3843                                 pr_debug_ratelimited(
3844                                         "%s check failed (%u, 0x%x, 0x%x)\n",
3845                                         __func__, j, h.index, h.reserved);
3846                                 goto vmabort;
3847                         }
3848
3849                         msr.index = h.index;
3850                         msr.data = h.value;
3851                         if (kvm_set_msr(vcpu, &msr)) {
3852                                 pr_debug_ratelimited(
3853                                         "%s WRMSR failed (%u, 0x%x, 0x%llx)\n",
3854                                         __func__, j, h.index, h.value);
3855                                 goto vmabort;
3856                         }
3857                 }
3858         }
3859
3860         return;
3861
3862 vmabort:
3863         nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL);
3864 }
3865
3866 /*
3867  * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1
3868  * and modify vmcs12 to make it see what it would expect to see there if
3869  * L2 was its real guest. Must only be called when in L2 (is_guest_mode())
3870  */
3871 void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
3872                        u32 exit_intr_info, unsigned long exit_qualification)
3873 {
3874         struct vcpu_vmx *vmx = to_vmx(vcpu);
3875         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3876
3877         /* trying to cancel vmlaunch/vmresume is a bug */
3878         WARN_ON_ONCE(vmx->nested.nested_run_pending);
3879
3880         leave_guest_mode(vcpu);
3881
3882         if (nested_cpu_has_preemption_timer(vmcs12))
3883                 hrtimer_cancel(&to_vmx(vcpu)->nested.preemption_timer);
3884
3885         if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
3886                 vcpu->arch.tsc_offset -= vmcs12->tsc_offset;
3887
3888         if (likely(!vmx->fail)) {
3889                 if (exit_reason == -1)
3890                         sync_vmcs12(vcpu, vmcs12);
3891                 else
3892                         prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info,
3893                                        exit_qualification);
3894
3895                 /*
3896                  * Must happen outside of sync_vmcs12() as it will
3897                  * also be used to capture vmcs12 cache as part of
3898                  * capturing nVMX state for snapshot (migration).
3899                  *
3900                  * Otherwise, this flush will dirty guest memory at a
3901                  * point it is already assumed by user-space to be
3902                  * immutable.
3903                  */
3904                 nested_flush_cached_shadow_vmcs12(vcpu, vmcs12);
3905         } else {
3906                 /*
3907                  * The only expected VM-instruction error is "VM entry with
3908                  * invalid control field(s)." Anything else indicates a
3909                  * problem with L0.  And we should never get here with a
3910                  * VMFail of any type if early consistency checks are enabled.
3911                  */
3912                 WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) !=
3913                              VMXERR_ENTRY_INVALID_CONTROL_FIELD);
3914                 WARN_ON_ONCE(nested_early_check);
3915         }
3916
3917         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
3918
3919         /* Update any VMCS fields that might have changed while L2 ran */
3920         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
3921         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
3922         vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
3923
3924         if (kvm_has_tsc_control)
3925                 decache_tsc_multiplier(vmx);
3926
3927         if (vmx->nested.change_vmcs01_virtual_apic_mode) {
3928                 vmx->nested.change_vmcs01_virtual_apic_mode = false;
3929                 vmx_set_virtual_apic_mode(vcpu);
3930         } else if (!nested_cpu_has_ept(vmcs12) &&
3931                    nested_cpu_has2(vmcs12,
3932                                    SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
3933                 vmx_flush_tlb(vcpu, true);
3934         }
3935
3936         /* Unpin physical memory we referred to in vmcs02 */
3937         if (vmx->nested.apic_access_page) {
3938                 kvm_release_page_dirty(vmx->nested.apic_access_page);
3939                 vmx->nested.apic_access_page = NULL;
3940         }
3941         if (vmx->nested.virtual_apic_page) {
3942                 kvm_release_page_dirty(vmx->nested.virtual_apic_page);
3943                 vmx->nested.virtual_apic_page = NULL;
3944         }
3945         if (vmx->nested.pi_desc_page) {
3946                 kunmap(vmx->nested.pi_desc_page);
3947                 kvm_release_page_dirty(vmx->nested.pi_desc_page);
3948                 vmx->nested.pi_desc_page = NULL;
3949                 vmx->nested.pi_desc = NULL;
3950         }
3951
3952         /*
3953          * We are now running in L2, mmu_notifier will force to reload the
3954          * page's hpa for L2 vmcs. Need to reload it for L1 before entering L1.
3955          */
3956         kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu);
3957
3958         if ((exit_reason != -1) && (enable_shadow_vmcs || vmx->nested.hv_evmcs))
3959                 vmx->nested.need_vmcs12_sync = true;
3960
3961         /* in case we halted in L2 */
3962         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3963
3964         if (likely(!vmx->fail)) {
3965                 /*
3966                  * TODO: SDM says that with acknowledge interrupt on
3967                  * exit, bit 31 of the VM-exit interrupt information
3968                  * (valid interrupt) is always set to 1 on
3969                  * EXIT_REASON_EXTERNAL_INTERRUPT, so we shouldn't
3970                  * need kvm_cpu_has_interrupt().  See the commit
3971                  * message for details.
3972                  */
3973                 if (nested_exit_intr_ack_set(vcpu) &&
3974                     exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
3975                     kvm_cpu_has_interrupt(vcpu)) {
3976                         int irq = kvm_cpu_get_interrupt(vcpu);
3977                         WARN_ON(irq < 0);
3978                         vmcs12->vm_exit_intr_info = irq |
3979                                 INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
3980                 }
3981
3982                 if (exit_reason != -1)
3983                         trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
3984                                                        vmcs12->exit_qualification,
3985                                                        vmcs12->idt_vectoring_info_field,
3986                                                        vmcs12->vm_exit_intr_info,
3987                                                        vmcs12->vm_exit_intr_error_code,
3988                                                        KVM_ISA_VMX);
3989
3990                 load_vmcs12_host_state(vcpu, vmcs12);
3991
3992                 return;
3993         }
3994
3995         /*
3996          * After an early L2 VM-entry failure, we're now back
3997          * in L1 which thinks it just finished a VMLAUNCH or
3998          * VMRESUME instruction, so we need to set the failure
3999          * flag and the VM-instruction error field of the VMCS
4000          * accordingly, and skip the emulated instruction.
4001          */
4002         (void)nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
4003
4004         /*
4005          * Restore L1's host state to KVM's software model.  We're here
4006          * because a consistency check was caught by hardware, which
4007          * means some amount of guest state has been propagated to KVM's
4008          * model and needs to be unwound to the host's state.
4009          */
4010         nested_vmx_restore_host_state(vcpu);
4011
4012         vmx->fail = 0;
4013 }
4014
4015 /*
4016  * Decode the memory-address operand of a vmx instruction, as recorded on an
4017  * exit caused by such an instruction (run by a guest hypervisor).
4018  * On success, returns 0. When the operand is invalid, returns 1 and throws
4019  * #UD or #GP.
4020  */
4021 int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
4022                         u32 vmx_instruction_info, bool wr, gva_t *ret)
4023 {
4024         gva_t off;
4025         bool exn;
4026         struct kvm_segment s;
4027
4028         /*
4029          * According to Vol. 3B, "Information for VM Exits Due to Instruction
4030          * Execution", on an exit, vmx_instruction_info holds most of the
4031          * addressing components of the operand. Only the displacement part
4032          * is put in exit_qualification (see 3B, "Basic VM-Exit Information").
4033          * For how an actual address is calculated from all these components,
4034          * refer to Vol. 1, "Operand Addressing".
4035          */
4036         int  scaling = vmx_instruction_info & 3;
4037         int  addr_size = (vmx_instruction_info >> 7) & 7;
4038         bool is_reg = vmx_instruction_info & (1u << 10);
4039         int  seg_reg = (vmx_instruction_info >> 15) & 7;
4040         int  index_reg = (vmx_instruction_info >> 18) & 0xf;
4041         bool index_is_valid = !(vmx_instruction_info & (1u << 22));
4042         int  base_reg       = (vmx_instruction_info >> 23) & 0xf;
4043         bool base_is_valid  = !(vmx_instruction_info & (1u << 27));
4044
4045         if (is_reg) {
4046                 kvm_queue_exception(vcpu, UD_VECTOR);
4047                 return 1;
4048         }
4049
4050         /* Addr = segment_base + offset */
4051         /* offset = base + [index * scale] + displacement */
4052         off = exit_qualification; /* holds the displacement */
4053         if (addr_size == 1)
4054                 off = (gva_t)sign_extend64(off, 31);
4055         else if (addr_size == 0)
4056                 off = (gva_t)sign_extend64(off, 15);
4057         if (base_is_valid)
4058                 off += kvm_register_read(vcpu, base_reg);
4059         if (index_is_valid)
4060                 off += kvm_register_read(vcpu, index_reg)<<scaling;
4061         vmx_get_segment(vcpu, &s, seg_reg);
4062
4063         /*
4064          * The effective address, i.e. @off, of a memory operand is truncated
4065          * based on the address size of the instruction.  Note that this is
4066          * the *effective address*, i.e. the address prior to accounting for
4067          * the segment's base.
4068          */
4069         if (addr_size == 1) /* 32 bit */
4070                 off &= 0xffffffff;
4071         else if (addr_size == 0) /* 16 bit */
4072                 off &= 0xffff;
4073
4074         /* Checks for #GP/#SS exceptions. */
4075         exn = false;
4076         if (is_long_mode(vcpu)) {
4077                 /*
4078                  * The virtual/linear address is never truncated in 64-bit
4079                  * mode, e.g. a 32-bit address size can yield a 64-bit virtual
4080                  * address when using FS/GS with a non-zero base.
4081                  */
4082                 *ret = s.base + off;
4083
4084                 /* Long mode: #GP(0)/#SS(0) if the memory address is in a
4085                  * non-canonical form. This is the only check on the memory
4086                  * destination for long mode!
4087                  */
4088                 exn = is_noncanonical_address(*ret, vcpu);
4089         } else {
4090                 /*
4091                  * When not in long mode, the virtual/linear address is
4092                  * unconditionally truncated to 32 bits regardless of the
4093                  * address size.
4094                  */
4095                 *ret = (s.base + off) & 0xffffffff;
4096
4097                 /* Protected mode: apply checks for segment validity in the
4098                  * following order:
4099                  * - segment type check (#GP(0) may be thrown)
4100                  * - usability check (#GP(0)/#SS(0))
4101                  * - limit check (#GP(0)/#SS(0))
4102                  */
4103                 if (wr)
4104                         /* #GP(0) if the destination operand is located in a
4105                          * read-only data segment or any code segment.
4106                          */
4107                         exn = ((s.type & 0xa) == 0 || (s.type & 8));
4108                 else
4109                         /* #GP(0) if the source operand is located in an
4110                          * execute-only code segment
4111                          */
4112                         exn = ((s.type & 0xa) == 8);
4113                 if (exn) {
4114                         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
4115                         return 1;
4116                 }
4117                 /* Protected mode: #GP(0)/#SS(0) if the segment is unusable.
4118                  */
4119                 exn = (s.unusable != 0);
4120
4121                 /*
4122                  * Protected mode: #GP(0)/#SS(0) if the memory operand is
4123                  * outside the segment limit.  All CPUs that support VMX ignore
4124                  * limit checks for flat segments, i.e. segments with base==0,
4125                  * limit==0xffffffff and of type expand-up data or code.
4126                  */
4127                 if (!(s.base == 0 && s.limit == 0xffffffff &&
4128                      ((s.type & 8) || !(s.type & 4))))
4129                         exn = exn || (off + sizeof(u64) > s.limit);
4130         }
4131         if (exn) {
4132                 kvm_queue_exception_e(vcpu,
4133                                       seg_reg == VCPU_SREG_SS ?
4134                                                 SS_VECTOR : GP_VECTOR,
4135                                       0);
4136                 return 1;
4137         }
4138
4139         return 0;
4140 }
4141
4142 static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer)
4143 {
4144         gva_t gva;
4145         struct x86_exception e;
4146
4147         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
4148                         vmcs_read32(VMX_INSTRUCTION_INFO), false, &gva))
4149                 return 1;
4150
4151         if (kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e)) {
4152                 kvm_inject_page_fault(vcpu, &e);
4153                 return 1;
4154         }
4155
4156         return 0;
4157 }
4158
4159 /*
4160  * Allocate a shadow VMCS and associate it with the currently loaded
4161  * VMCS, unless such a shadow VMCS already exists. The newly allocated
4162  * VMCS is also VMCLEARed, so that it is ready for use.
4163  */
4164 static struct vmcs *alloc_shadow_vmcs(struct kvm_vcpu *vcpu)
4165 {
4166         struct vcpu_vmx *vmx = to_vmx(vcpu);
4167         struct loaded_vmcs *loaded_vmcs = vmx->loaded_vmcs;
4168
4169         /*
4170          * We should allocate a shadow vmcs for vmcs01 only when L1
4171          * executes VMXON and free it when L1 executes VMXOFF.
4172          * As it is invalid to execute VMXON twice, we shouldn't reach
4173          * here when vmcs01 already have an allocated shadow vmcs.
4174          */
4175         WARN_ON(loaded_vmcs == &vmx->vmcs01 && loaded_vmcs->shadow_vmcs);
4176
4177         if (!loaded_vmcs->shadow_vmcs) {
4178                 loaded_vmcs->shadow_vmcs = alloc_vmcs(true);
4179                 if (loaded_vmcs->shadow_vmcs)
4180                         vmcs_clear(loaded_vmcs->shadow_vmcs);
4181         }
4182         return loaded_vmcs->shadow_vmcs;
4183 }
4184
4185 static int enter_vmx_operation(struct kvm_vcpu *vcpu)
4186 {
4187         struct vcpu_vmx *vmx = to_vmx(vcpu);
4188         int r;
4189
4190         r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
4191         if (r < 0)
4192                 goto out_vmcs02;
4193
4194         vmx->nested.cached_vmcs12 = kzalloc(VMCS12_SIZE, GFP_KERNEL_ACCOUNT);
4195         if (!vmx->nested.cached_vmcs12)
4196                 goto out_cached_vmcs12;
4197
4198         vmx->nested.cached_shadow_vmcs12 = kzalloc(VMCS12_SIZE, GFP_KERNEL_ACCOUNT);
4199         if (!vmx->nested.cached_shadow_vmcs12)
4200                 goto out_cached_shadow_vmcs12;
4201
4202         if (enable_shadow_vmcs && !alloc_shadow_vmcs(vcpu))
4203                 goto out_shadow_vmcs;
4204
4205         hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC,
4206                      HRTIMER_MODE_REL_PINNED);
4207         vmx->nested.preemption_timer.function = vmx_preemption_timer_fn;
4208
4209         vmx->nested.vpid02 = allocate_vpid();
4210
4211         vmx->nested.vmcs02_initialized = false;
4212         vmx->nested.vmxon = true;
4213
4214         if (pt_mode == PT_MODE_HOST_GUEST) {
4215                 vmx->pt_desc.guest.ctl = 0;
4216                 pt_update_intercept_for_msr(vmx);
4217         }
4218
4219         return 0;
4220
4221 out_shadow_vmcs:
4222         kfree(vmx->nested.cached_shadow_vmcs12);
4223
4224 out_cached_shadow_vmcs12:
4225         kfree(vmx->nested.cached_vmcs12);
4226
4227 out_cached_vmcs12:
4228         free_loaded_vmcs(&vmx->nested.vmcs02);
4229
4230 out_vmcs02:
4231         return -ENOMEM;
4232 }
4233
4234 /*
4235  * Emulate the VMXON instruction.
4236  * Currently, we just remember that VMX is active, and do not save or even
4237  * inspect the argument to VMXON (the so-called "VMXON pointer") because we
4238  * do not currently need to store anything in that guest-allocated memory
4239  * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
4240  * argument is different from the VMXON pointer (which the spec says they do).
4241  */
4242 static int handle_vmon(struct kvm_vcpu *vcpu)
4243 {
4244         int ret;
4245         gpa_t vmptr;
4246         struct page *page;
4247         struct vcpu_vmx *vmx = to_vmx(vcpu);
4248         const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED
4249                 | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
4250
4251         /*
4252          * The Intel VMX Instruction Reference lists a bunch of bits that are
4253          * prerequisite to running VMXON, most notably cr4.VMXE must be set to
4254          * 1 (see vmx_set_cr4() for when we allow the guest to set this).
4255          * Otherwise, we should fail with #UD.  But most faulting conditions
4256          * have already been checked by hardware, prior to the VM-exit for
4257          * VMXON.  We do test guest cr4.VMXE because processor CR4 always has
4258          * that bit set to 1 in non-root mode.
4259          */
4260         if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE)) {
4261                 kvm_queue_exception(vcpu, UD_VECTOR);
4262                 return 1;
4263         }
4264
4265         /* CPL=0 must be checked manually. */
4266         if (vmx_get_cpl(vcpu)) {
4267                 kvm_inject_gp(vcpu, 0);
4268                 return 1;
4269         }
4270
4271         if (vmx->nested.vmxon)
4272                 return nested_vmx_failValid(vcpu,
4273                         VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
4274
4275         if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES)
4276                         != VMXON_NEEDED_FEATURES) {
4277                 kvm_inject_gp(vcpu, 0);
4278                 return 1;
4279         }
4280
4281         if (nested_vmx_get_vmptr(vcpu, &vmptr))
4282                 return 1;
4283
4284         /*
4285          * SDM 3: 24.11.5
4286          * The first 4 bytes of VMXON region contain the supported
4287          * VMCS revision identifier
4288          *
4289          * Note - IA32_VMX_BASIC[48] will never be 1 for the nested case;
4290          * which replaces physical address width with 32
4291          */
4292         if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
4293                 return nested_vmx_failInvalid(vcpu);
4294
4295         page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
4296         if (is_error_page(page))
4297                 return nested_vmx_failInvalid(vcpu);
4298
4299         if (*(u32 *)kmap(page) != VMCS12_REVISION) {
4300                 kunmap(page);
4301                 kvm_release_page_clean(page);
4302                 return nested_vmx_failInvalid(vcpu);
4303         }
4304         kunmap(page);
4305         kvm_release_page_clean(page);
4306
4307         vmx->nested.vmxon_ptr = vmptr;
4308         ret = enter_vmx_operation(vcpu);
4309         if (ret)
4310                 return ret;
4311
4312         return nested_vmx_succeed(vcpu);
4313 }
4314
4315 static inline void nested_release_vmcs12(struct kvm_vcpu *vcpu)
4316 {
4317         struct vcpu_vmx *vmx = to_vmx(vcpu);
4318
4319         if (vmx->nested.current_vmptr == -1ull)
4320                 return;
4321
4322         if (enable_shadow_vmcs) {
4323                 /* copy to memory all shadowed fields in case
4324                    they were modified */
4325                 copy_shadow_to_vmcs12(vmx);
4326                 vmx->nested.need_vmcs12_sync = false;
4327                 vmx_disable_shadow_vmcs(vmx);
4328         }
4329         vmx->nested.posted_intr_nv = -1;
4330
4331         /* Flush VMCS12 to guest memory */
4332         kvm_vcpu_write_guest_page(vcpu,
4333                                   vmx->nested.current_vmptr >> PAGE_SHIFT,
4334                                   vmx->nested.cached_vmcs12, 0, VMCS12_SIZE);
4335
4336         kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
4337
4338         vmx->nested.current_vmptr = -1ull;
4339 }
4340
4341 /* Emulate the VMXOFF instruction */
4342 static int handle_vmoff(struct kvm_vcpu *vcpu)
4343 {
4344         if (!nested_vmx_check_permission(vcpu))
4345                 return 1;
4346         free_nested(vcpu);
4347         return nested_vmx_succeed(vcpu);
4348 }
4349
4350 /* Emulate the VMCLEAR instruction */
4351 static int handle_vmclear(struct kvm_vcpu *vcpu)
4352 {
4353         struct vcpu_vmx *vmx = to_vmx(vcpu);
4354         u32 zero = 0;
4355         gpa_t vmptr;
4356
4357         if (!nested_vmx_check_permission(vcpu))
4358                 return 1;
4359
4360         if (nested_vmx_get_vmptr(vcpu, &vmptr))
4361                 return 1;
4362
4363         if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
4364                 return nested_vmx_failValid(vcpu,
4365                         VMXERR_VMCLEAR_INVALID_ADDRESS);
4366
4367         if (vmptr == vmx->nested.vmxon_ptr)
4368                 return nested_vmx_failValid(vcpu,
4369                         VMXERR_VMCLEAR_VMXON_POINTER);
4370
4371         if (vmx->nested.hv_evmcs_page) {
4372                 if (vmptr == vmx->nested.hv_evmcs_vmptr)
4373                         nested_release_evmcs(vcpu);
4374         } else {
4375                 if (vmptr == vmx->nested.current_vmptr)
4376                         nested_release_vmcs12(vcpu);
4377
4378                 kvm_vcpu_write_guest(vcpu,
4379                                      vmptr + offsetof(struct vmcs12,
4380                                                       launch_state),
4381                                      &zero, sizeof(zero));
4382         }
4383
4384         return nested_vmx_succeed(vcpu);
4385 }
4386
4387 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
4388
4389 /* Emulate the VMLAUNCH instruction */
4390 static int handle_vmlaunch(struct kvm_vcpu *vcpu)
4391 {
4392         return nested_vmx_run(vcpu, true);
4393 }
4394
4395 /* Emulate the VMRESUME instruction */
4396 static int handle_vmresume(struct kvm_vcpu *vcpu)
4397 {
4398
4399         return nested_vmx_run(vcpu, false);
4400 }
4401
4402 static int handle_vmread(struct kvm_vcpu *vcpu)
4403 {
4404         unsigned long field;
4405         u64 field_value;
4406         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4407         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4408         gva_t gva = 0;
4409         struct vmcs12 *vmcs12;
4410
4411         if (!nested_vmx_check_permission(vcpu))
4412                 return 1;
4413
4414         if (to_vmx(vcpu)->nested.current_vmptr == -1ull)
4415                 return nested_vmx_failInvalid(vcpu);
4416
4417         if (!is_guest_mode(vcpu))
4418                 vmcs12 = get_vmcs12(vcpu);
4419         else {
4420                 /*
4421                  * When vmcs->vmcs_link_pointer is -1ull, any VMREAD
4422                  * to shadowed-field sets the ALU flags for VMfailInvalid.
4423                  */
4424                 if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull)
4425                         return nested_vmx_failInvalid(vcpu);
4426                 vmcs12 = get_shadow_vmcs12(vcpu);
4427         }
4428
4429         /* Decode instruction info and find the field to read */
4430         field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
4431         /* Read the field, zero-extended to a u64 field_value */
4432         if (vmcs12_read_any(vmcs12, field, &field_value) < 0)
4433                 return nested_vmx_failValid(vcpu,
4434                         VMXERR_UNSUPPORTED_VMCS_COMPONENT);
4435
4436         /*
4437          * Now copy part of this value to register or memory, as requested.
4438          * Note that the number of bits actually copied is 32 or 64 depending
4439          * on the guest's mode (32 or 64 bit), not on the given field's length.
4440          */
4441         if (vmx_instruction_info & (1u << 10)) {
4442                 kvm_register_writel(vcpu, (((vmx_instruction_info) >> 3) & 0xf),
4443                         field_value);
4444         } else {
4445                 if (get_vmx_mem_address(vcpu, exit_qualification,
4446                                 vmx_instruction_info, true, &gva))
4447                         return 1;
4448                 /* _system ok, nested_vmx_check_permission has verified cpl=0 */
4449                 kvm_write_guest_virt_system(vcpu, gva, &field_value,
4450                                             (is_long_mode(vcpu) ? 8 : 4), NULL);
4451         }
4452
4453         return nested_vmx_succeed(vcpu);
4454 }
4455
4456
4457 static int handle_vmwrite(struct kvm_vcpu *vcpu)
4458 {
4459         unsigned long field;
4460         gva_t gva;
4461         struct vcpu_vmx *vmx = to_vmx(vcpu);
4462         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4463         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4464
4465         /* The value to write might be 32 or 64 bits, depending on L1's long
4466          * mode, and eventually we need to write that into a field of several
4467          * possible lengths. The code below first zero-extends the value to 64
4468          * bit (field_value), and then copies only the appropriate number of
4469          * bits into the vmcs12 field.
4470          */
4471         u64 field_value = 0;
4472         struct x86_exception e;
4473         struct vmcs12 *vmcs12;
4474
4475         if (!nested_vmx_check_permission(vcpu))
4476                 return 1;
4477
4478         if (vmx->nested.current_vmptr == -1ull)
4479                 return nested_vmx_failInvalid(vcpu);
4480
4481         if (vmx_instruction_info & (1u << 10))
4482                 field_value = kvm_register_readl(vcpu,
4483                         (((vmx_instruction_info) >> 3) & 0xf));
4484         else {
4485                 if (get_vmx_mem_address(vcpu, exit_qualification,
4486                                 vmx_instruction_info, false, &gva))
4487                         return 1;
4488                 if (kvm_read_guest_virt(vcpu, gva, &field_value,
4489                                         (is_64_bit_mode(vcpu) ? 8 : 4), &e)) {
4490                         kvm_inject_page_fault(vcpu, &e);
4491                         return 1;
4492                 }
4493         }
4494
4495
4496         field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
4497         /*
4498          * If the vCPU supports "VMWRITE to any supported field in the
4499          * VMCS," then the "read-only" fields are actually read/write.
4500          */
4501         if (vmcs_field_readonly(field) &&
4502             !nested_cpu_has_vmwrite_any_field(vcpu))
4503                 return nested_vmx_failValid(vcpu,
4504                         VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
4505
4506         if (!is_guest_mode(vcpu))
4507                 vmcs12 = get_vmcs12(vcpu);
4508         else {
4509                 /*
4510                  * When vmcs->vmcs_link_pointer is -1ull, any VMWRITE
4511                  * to shadowed-field sets the ALU flags for VMfailInvalid.
4512                  */
4513                 if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull)
4514                         return nested_vmx_failInvalid(vcpu);
4515                 vmcs12 = get_shadow_vmcs12(vcpu);
4516         }
4517
4518         if (vmcs12_write_any(vmcs12, field, field_value) < 0)
4519                 return nested_vmx_failValid(vcpu,
4520                         VMXERR_UNSUPPORTED_VMCS_COMPONENT);
4521
4522         /*
4523          * Do not track vmcs12 dirty-state if in guest-mode
4524          * as we actually dirty shadow vmcs12 instead of vmcs12.
4525          */
4526         if (!is_guest_mode(vcpu)) {
4527                 switch (field) {
4528 #define SHADOW_FIELD_RW(x) case x:
4529 #include "vmcs_shadow_fields.h"
4530                         /*
4531                          * The fields that can be updated by L1 without a vmexit are
4532                          * always updated in the vmcs02, the others go down the slow
4533                          * path of prepare_vmcs02.
4534                          */
4535                         break;
4536                 default:
4537                         vmx->nested.dirty_vmcs12 = true;
4538                         break;
4539                 }
4540         }
4541
4542         return nested_vmx_succeed(vcpu);
4543 }
4544
4545 static void set_current_vmptr(struct vcpu_vmx *vmx, gpa_t vmptr)
4546 {
4547         vmx->nested.current_vmptr = vmptr;
4548         if (enable_shadow_vmcs) {
4549                 vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL,
4550                               SECONDARY_EXEC_SHADOW_VMCS);
4551                 vmcs_write64(VMCS_LINK_POINTER,
4552                              __pa(vmx->vmcs01.shadow_vmcs));
4553                 vmx->nested.need_vmcs12_sync = true;
4554         }
4555         vmx->nested.dirty_vmcs12 = true;
4556 }
4557
4558 /* Emulate the VMPTRLD instruction */
4559 static int handle_vmptrld(struct kvm_vcpu *vcpu)
4560 {
4561         struct vcpu_vmx *vmx = to_vmx(vcpu);
4562         gpa_t vmptr;
4563
4564         if (!nested_vmx_check_permission(vcpu))
4565                 return 1;
4566
4567         if (nested_vmx_get_vmptr(vcpu, &vmptr))
4568                 return 1;
4569
4570         if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
4571                 return nested_vmx_failValid(vcpu,
4572                         VMXERR_VMPTRLD_INVALID_ADDRESS);
4573
4574         if (vmptr == vmx->nested.vmxon_ptr)
4575                 return nested_vmx_failValid(vcpu,
4576                         VMXERR_VMPTRLD_VMXON_POINTER);
4577
4578         /* Forbid normal VMPTRLD if Enlightened version was used */
4579         if (vmx->nested.hv_evmcs)
4580                 return 1;
4581
4582         if (vmx->nested.current_vmptr != vmptr) {
4583                 struct vmcs12 *new_vmcs12;
4584                 struct page *page;
4585
4586                 page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
4587                 if (is_error_page(page)) {
4588                         /*
4589                          * Reads from an unbacked page return all 1s,
4590                          * which means that the 32 bits located at the
4591                          * given physical address won't match the required
4592                          * VMCS12_REVISION identifier.
4593                          */
4594                         return nested_vmx_failValid(vcpu,
4595                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
4596                 }
4597                 new_vmcs12 = kmap(page);
4598                 if (new_vmcs12->hdr.revision_id != VMCS12_REVISION ||
4599                     (new_vmcs12->hdr.shadow_vmcs &&
4600                      !nested_cpu_has_vmx_shadow_vmcs(vcpu))) {
4601                         kunmap(page);
4602                         kvm_release_page_clean(page);
4603                         return nested_vmx_failValid(vcpu,
4604                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
4605                 }
4606
4607                 nested_release_vmcs12(vcpu);
4608
4609                 /*
4610                  * Load VMCS12 from guest memory since it is not already
4611                  * cached.
4612                  */
4613                 memcpy(vmx->nested.cached_vmcs12, new_vmcs12, VMCS12_SIZE);
4614                 kunmap(page);
4615                 kvm_release_page_clean(page);
4616
4617                 set_current_vmptr(vmx, vmptr);
4618         }
4619
4620         return nested_vmx_succeed(vcpu);
4621 }
4622
4623 /* Emulate the VMPTRST instruction */
4624 static int handle_vmptrst(struct kvm_vcpu *vcpu)
4625 {
4626         unsigned long exit_qual = vmcs_readl(EXIT_QUALIFICATION);
4627         u32 instr_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4628         gpa_t current_vmptr = to_vmx(vcpu)->nested.current_vmptr;
4629         struct x86_exception e;
4630         gva_t gva;
4631
4632         if (!nested_vmx_check_permission(vcpu))
4633                 return 1;
4634
4635         if (unlikely(to_vmx(vcpu)->nested.hv_evmcs))
4636                 return 1;
4637
4638         if (get_vmx_mem_address(vcpu, exit_qual, instr_info, true, &gva))
4639                 return 1;
4640         /* *_system ok, nested_vmx_check_permission has verified cpl=0 */
4641         if (kvm_write_guest_virt_system(vcpu, gva, (void *)&current_vmptr,
4642                                         sizeof(gpa_t), &e)) {
4643                 kvm_inject_page_fault(vcpu, &e);
4644                 return 1;
4645         }
4646         return nested_vmx_succeed(vcpu);
4647 }
4648
4649 /* Emulate the INVEPT instruction */
4650 static int handle_invept(struct kvm_vcpu *vcpu)
4651 {
4652         struct vcpu_vmx *vmx = to_vmx(vcpu);
4653         u32 vmx_instruction_info, types;
4654         unsigned long type;
4655         gva_t gva;
4656         struct x86_exception e;
4657         struct {
4658                 u64 eptp, gpa;
4659         } operand;
4660
4661         if (!(vmx->nested.msrs.secondary_ctls_high &
4662               SECONDARY_EXEC_ENABLE_EPT) ||
4663             !(vmx->nested.msrs.ept_caps & VMX_EPT_INVEPT_BIT)) {
4664                 kvm_queue_exception(vcpu, UD_VECTOR);
4665                 return 1;
4666         }
4667
4668         if (!nested_vmx_check_permission(vcpu))
4669                 return 1;
4670
4671         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4672         type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
4673
4674         types = (vmx->nested.msrs.ept_caps >> VMX_EPT_EXTENT_SHIFT) & 6;
4675
4676         if (type >= 32 || !(types & (1 << type)))
4677                 return nested_vmx_failValid(vcpu,
4678                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
4679
4680         /* According to the Intel VMX instruction reference, the memory
4681          * operand is read even if it isn't needed (e.g., for type==global)
4682          */
4683         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
4684                         vmx_instruction_info, false, &gva))
4685                 return 1;
4686         if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) {
4687                 kvm_inject_page_fault(vcpu, &e);
4688                 return 1;
4689         }
4690
4691         switch (type) {
4692         case VMX_EPT_EXTENT_GLOBAL:
4693         /*
4694          * TODO: track mappings and invalidate
4695          * single context requests appropriately
4696          */
4697         case VMX_EPT_EXTENT_CONTEXT:
4698                 kvm_mmu_sync_roots(vcpu);
4699                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4700                 break;
4701         default:
4702                 BUG_ON(1);
4703                 break;
4704         }
4705
4706         return nested_vmx_succeed(vcpu);
4707 }
4708
4709 static int handle_invvpid(struct kvm_vcpu *vcpu)
4710 {
4711         struct vcpu_vmx *vmx = to_vmx(vcpu);
4712         u32 vmx_instruction_info;
4713         unsigned long type, types;
4714         gva_t gva;
4715         struct x86_exception e;
4716         struct {
4717                 u64 vpid;
4718                 u64 gla;
4719         } operand;
4720         u16 vpid02;
4721
4722         if (!(vmx->nested.msrs.secondary_ctls_high &
4723               SECONDARY_EXEC_ENABLE_VPID) ||
4724                         !(vmx->nested.msrs.vpid_caps & VMX_VPID_INVVPID_BIT)) {
4725                 kvm_queue_exception(vcpu, UD_VECTOR);
4726                 return 1;
4727         }
4728
4729         if (!nested_vmx_check_permission(vcpu))
4730                 return 1;
4731
4732         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4733         type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
4734
4735         types = (vmx->nested.msrs.vpid_caps &
4736                         VMX_VPID_EXTENT_SUPPORTED_MASK) >> 8;
4737
4738         if (type >= 32 || !(types & (1 << type)))
4739                 return nested_vmx_failValid(vcpu,
4740                         VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
4741
4742         /* according to the intel vmx instruction reference, the memory
4743          * operand is read even if it isn't needed (e.g., for type==global)
4744          */
4745         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
4746                         vmx_instruction_info, false, &gva))
4747                 return 1;
4748         if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) {
4749                 kvm_inject_page_fault(vcpu, &e);
4750                 return 1;
4751         }
4752         if (operand.vpid >> 16)
4753                 return nested_vmx_failValid(vcpu,
4754                         VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
4755
4756         vpid02 = nested_get_vpid02(vcpu);
4757         switch (type) {
4758         case VMX_VPID_EXTENT_INDIVIDUAL_ADDR:
4759                 if (!operand.vpid ||
4760                     is_noncanonical_address(operand.gla, vcpu))
4761                         return nested_vmx_failValid(vcpu,
4762                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
4763                 if (cpu_has_vmx_invvpid_individual_addr()) {
4764                         __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR,
4765                                 vpid02, operand.gla);
4766                 } else
4767                         __vmx_flush_tlb(vcpu, vpid02, false);
4768                 break;
4769         case VMX_VPID_EXTENT_SINGLE_CONTEXT:
4770         case VMX_VPID_EXTENT_SINGLE_NON_GLOBAL:
4771                 if (!operand.vpid)
4772                         return nested_vmx_failValid(vcpu,
4773                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
4774                 __vmx_flush_tlb(vcpu, vpid02, false);
4775                 break;
4776         case VMX_VPID_EXTENT_ALL_CONTEXT:
4777                 __vmx_flush_tlb(vcpu, vpid02, false);
4778                 break;
4779         default:
4780                 WARN_ON_ONCE(1);
4781                 return kvm_skip_emulated_instruction(vcpu);
4782         }
4783
4784         return nested_vmx_succeed(vcpu);
4785 }
4786
4787 static int nested_vmx_eptp_switching(struct kvm_vcpu *vcpu,
4788                                      struct vmcs12 *vmcs12)
4789 {
4790         u32 index = vcpu->arch.regs[VCPU_REGS_RCX];
4791         u64 address;
4792         bool accessed_dirty;
4793         struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
4794
4795         if (!nested_cpu_has_eptp_switching(vmcs12) ||
4796             !nested_cpu_has_ept(vmcs12))
4797                 return 1;
4798
4799         if (index >= VMFUNC_EPTP_ENTRIES)
4800                 return 1;
4801
4802
4803         if (kvm_vcpu_read_guest_page(vcpu, vmcs12->eptp_list_address >> PAGE_SHIFT,
4804                                      &address, index * 8, 8))
4805                 return 1;
4806
4807         accessed_dirty = !!(address & VMX_EPTP_AD_ENABLE_BIT);
4808
4809         /*
4810          * If the (L2) guest does a vmfunc to the currently
4811          * active ept pointer, we don't have to do anything else
4812          */
4813         if (vmcs12->ept_pointer != address) {
4814                 if (!valid_ept_address(vcpu, address))
4815                         return 1;
4816
4817                 kvm_mmu_unload(vcpu);
4818                 mmu->ept_ad = accessed_dirty;
4819                 mmu->mmu_role.base.ad_disabled = !accessed_dirty;
4820                 vmcs12->ept_pointer = address;
4821                 /*
4822                  * TODO: Check what's the correct approach in case
4823                  * mmu reload fails. Currently, we just let the next
4824                  * reload potentially fail
4825                  */
4826                 kvm_mmu_reload(vcpu);
4827         }
4828
4829         return 0;
4830 }
4831
4832 static int handle_vmfunc(struct kvm_vcpu *vcpu)
4833 {
4834         struct vcpu_vmx *vmx = to_vmx(vcpu);
4835         struct vmcs12 *vmcs12;
4836         u32 function = vcpu->arch.regs[VCPU_REGS_RAX];
4837
4838         /*
4839          * VMFUNC is only supported for nested guests, but we always enable the
4840          * secondary control for simplicity; for non-nested mode, fake that we
4841          * didn't by injecting #UD.
4842          */
4843         if (!is_guest_mode(vcpu)) {
4844                 kvm_queue_exception(vcpu, UD_VECTOR);
4845                 return 1;
4846         }
4847
4848         vmcs12 = get_vmcs12(vcpu);
4849         if ((vmcs12->vm_function_control & (1 << function)) == 0)
4850                 goto fail;
4851
4852         switch (function) {
4853         case 0:
4854                 if (nested_vmx_eptp_switching(vcpu, vmcs12))
4855                         goto fail;
4856                 break;
4857         default:
4858                 goto fail;
4859         }
4860         return kvm_skip_emulated_instruction(vcpu);
4861
4862 fail:
4863         nested_vmx_vmexit(vcpu, vmx->exit_reason,
4864                           vmcs_read32(VM_EXIT_INTR_INFO),
4865                           vmcs_readl(EXIT_QUALIFICATION));
4866         return 1;
4867 }
4868
4869
4870 static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
4871                                        struct vmcs12 *vmcs12)
4872 {
4873         unsigned long exit_qualification;
4874         gpa_t bitmap, last_bitmap;
4875         unsigned int port;
4876         int size;
4877         u8 b;
4878
4879         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
4880                 return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING);
4881
4882         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4883
4884         port = exit_qualification >> 16;
4885         size = (exit_qualification & 7) + 1;
4886
4887         last_bitmap = (gpa_t)-1;
4888         b = -1;
4889
4890         while (size > 0) {
4891                 if (port < 0x8000)
4892                         bitmap = vmcs12->io_bitmap_a;
4893                 else if (port < 0x10000)
4894                         bitmap = vmcs12->io_bitmap_b;
4895                 else
4896                         return true;
4897                 bitmap += (port & 0x7fff) / 8;
4898
4899                 if (last_bitmap != bitmap)
4900                         if (kvm_vcpu_read_guest(vcpu, bitmap, &b, 1))
4901                                 return true;
4902                 if (b & (1 << (port & 7)))
4903                         return true;
4904
4905                 port++;
4906                 size--;
4907                 last_bitmap = bitmap;
4908         }
4909
4910         return false;
4911 }
4912
4913 /*
4914  * Return 1 if we should exit from L2 to L1 to handle an MSR access access,
4915  * rather than handle it ourselves in L0. I.e., check whether L1 expressed
4916  * disinterest in the current event (read or write a specific MSR) by using an
4917  * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps.
4918  */
4919 static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
4920         struct vmcs12 *vmcs12, u32 exit_reason)
4921 {
4922         u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX];
4923         gpa_t bitmap;
4924
4925         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
4926                 return true;
4927
4928         /*
4929          * The MSR_BITMAP page is divided into four 1024-byte bitmaps,
4930          * for the four combinations of read/write and low/high MSR numbers.
4931          * First we need to figure out which of the four to use:
4932          */
4933         bitmap = vmcs12->msr_bitmap;
4934         if (exit_reason == EXIT_REASON_MSR_WRITE)
4935                 bitmap += 2048;
4936         if (msr_index >= 0xc0000000) {
4937                 msr_index -= 0xc0000000;
4938                 bitmap += 1024;
4939         }
4940
4941         /* Then read the msr_index'th bit from this bitmap: */
4942         if (msr_index < 1024*8) {
4943                 unsigned char b;
4944                 if (kvm_vcpu_read_guest(vcpu, bitmap + msr_index/8, &b, 1))
4945                         return true;
4946                 return 1 & (b >> (msr_index & 7));
4947         } else
4948                 return true; /* let L1 handle the wrong parameter */
4949 }
4950
4951 /*
4952  * Return 1 if we should exit from L2 to L1 to handle a CR access exit,
4953  * rather than handle it ourselves in L0. I.e., check if L1 wanted to
4954  * intercept (via guest_host_mask etc.) the current event.
4955  */
4956 static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
4957         struct vmcs12 *vmcs12)
4958 {
4959         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4960         int cr = exit_qualification & 15;
4961         int reg;
4962         unsigned long val;
4963
4964         switch ((exit_qualification >> 4) & 3) {
4965         case 0: /* mov to cr */
4966                 reg = (exit_qualification >> 8) & 15;
4967                 val = kvm_register_readl(vcpu, reg);
4968                 switch (cr) {
4969                 case 0:
4970                         if (vmcs12->cr0_guest_host_mask &
4971                             (val ^ vmcs12->cr0_read_shadow))
4972                                 return true;
4973                         break;
4974                 case 3:
4975                         if ((vmcs12->cr3_target_count >= 1 &&
4976                                         vmcs12->cr3_target_value0 == val) ||
4977                                 (vmcs12->cr3_target_count >= 2 &&
4978                                         vmcs12->cr3_target_value1 == val) ||
4979                                 (vmcs12->cr3_target_count >= 3 &&
4980                                         vmcs12->cr3_target_value2 == val) ||
4981                                 (vmcs12->cr3_target_count >= 4 &&
4982                                         vmcs12->cr3_target_value3 == val))
4983                                 return false;
4984                         if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
4985                                 return true;
4986                         break;
4987                 case 4:
4988                         if (vmcs12->cr4_guest_host_mask &
4989                             (vmcs12->cr4_read_shadow ^ val))
4990                                 return true;
4991                         break;
4992                 case 8:
4993                         if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING))
4994                                 return true;
4995                         break;
4996                 }
4997                 break;
4998         case 2: /* clts */
4999                 if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) &&
5000                     (vmcs12->cr0_read_shadow & X86_CR0_TS))
5001                         return true;
5002                 break;
5003         case 1: /* mov from cr */
5004                 switch (cr) {
5005                 case 3:
5006                         if (vmcs12->cpu_based_vm_exec_control &
5007                             CPU_BASED_CR3_STORE_EXITING)
5008                                 return true;
5009                         break;
5010                 case 8:
5011                         if (vmcs12->cpu_based_vm_exec_control &
5012                             CPU_BASED_CR8_STORE_EXITING)
5013                                 return true;
5014                         break;
5015                 }
5016                 break;
5017         case 3: /* lmsw */
5018                 /*
5019                  * lmsw can change bits 1..3 of cr0, and only set bit 0 of
5020                  * cr0. Other attempted changes are ignored, with no exit.
5021                  */
5022                 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
5023                 if (vmcs12->cr0_guest_host_mask & 0xe &
5024                     (val ^ vmcs12->cr0_read_shadow))
5025                         return true;
5026                 if ((vmcs12->cr0_guest_host_mask & 0x1) &&
5027                     !(vmcs12->cr0_read_shadow & 0x1) &&
5028                     (val & 0x1))
5029                         return true;
5030                 break;
5031         }
5032         return false;
5033 }
5034
5035 static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu,
5036         struct vmcs12 *vmcs12, gpa_t bitmap)
5037 {
5038         u32 vmx_instruction_info;
5039         unsigned long field;
5040         u8 b;
5041
5042         if (!nested_cpu_has_shadow_vmcs(vmcs12))
5043                 return true;
5044
5045         /* Decode instruction info and find the field to access */
5046         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5047         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
5048
5049         /* Out-of-range fields always cause a VM exit from L2 to L1 */
5050         if (field >> 15)
5051                 return true;
5052
5053         if (kvm_vcpu_read_guest(vcpu, bitmap + field/8, &b, 1))
5054                 return true;
5055
5056         return 1 & (b >> (field & 7));
5057 }
5058
5059 /*
5060  * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we
5061  * should handle it ourselves in L0 (and then continue L2). Only call this
5062  * when in is_guest_mode (L2).
5063  */
5064 bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason)
5065 {
5066         u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5067         struct vcpu_vmx *vmx = to_vmx(vcpu);
5068         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
5069
5070         if (vmx->nested.nested_run_pending)
5071                 return false;
5072
5073         if (unlikely(vmx->fail)) {
5074                 pr_info_ratelimited("%s failed vm entry %x\n", __func__,
5075                                     vmcs_read32(VM_INSTRUCTION_ERROR));
5076                 return true;
5077         }
5078
5079         /*
5080          * The host physical addresses of some pages of guest memory
5081          * are loaded into the vmcs02 (e.g. vmcs12's Virtual APIC
5082          * Page). The CPU may write to these pages via their host
5083          * physical address while L2 is running, bypassing any
5084          * address-translation-based dirty tracking (e.g. EPT write
5085          * protection).
5086          *
5087          * Mark them dirty on every exit from L2 to prevent them from
5088          * getting out of sync with dirty tracking.
5089          */
5090         nested_mark_vmcs12_pages_dirty(vcpu);
5091
5092         trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason,
5093                                 vmcs_readl(EXIT_QUALIFICATION),
5094                                 vmx->idt_vectoring_info,
5095                                 intr_info,
5096                                 vmcs_read32(VM_EXIT_INTR_ERROR_CODE),
5097                                 KVM_ISA_VMX);
5098
5099         switch (exit_reason) {
5100         case EXIT_REASON_EXCEPTION_NMI:
5101                 if (is_nmi(intr_info))
5102                         return false;
5103                 else if (is_page_fault(intr_info))
5104                         return !vmx->vcpu.arch.apf.host_apf_reason && enable_ept;
5105                 else if (is_debug(intr_info) &&
5106                          vcpu->guest_debug &
5107                          (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
5108                         return false;
5109                 else if (is_breakpoint(intr_info) &&
5110                          vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
5111                         return false;
5112                 return vmcs12->exception_bitmap &
5113                                 (1u << (intr_info & INTR_INFO_VECTOR_MASK));
5114         case EXIT_REASON_EXTERNAL_INTERRUPT:
5115                 return false;
5116         case EXIT_REASON_TRIPLE_FAULT:
5117                 return true;
5118         case EXIT_REASON_PENDING_INTERRUPT:
5119                 return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_INTR_PENDING);
5120         case EXIT_REASON_NMI_WINDOW:
5121                 return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING);
5122         case EXIT_REASON_TASK_SWITCH:
5123                 return true;
5124         case EXIT_REASON_CPUID:
5125                 return true;
5126         case EXIT_REASON_HLT:
5127                 return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
5128         case EXIT_REASON_INVD:
5129                 return true;
5130         case EXIT_REASON_INVLPG:
5131                 return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
5132         case EXIT_REASON_RDPMC:
5133                 return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
5134         case EXIT_REASON_RDRAND:
5135                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDRAND_EXITING);
5136         case EXIT_REASON_RDSEED:
5137                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING);
5138         case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP:
5139                 return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
5140         case EXIT_REASON_VMREAD:
5141                 return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
5142                         vmcs12->vmread_bitmap);
5143         case EXIT_REASON_VMWRITE:
5144                 return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
5145                         vmcs12->vmwrite_bitmap);
5146         case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
5147         case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
5148         case EXIT_REASON_VMPTRST: case EXIT_REASON_VMRESUME:
5149         case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
5150         case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID:
5151                 /*
5152                  * VMX instructions trap unconditionally. This allows L1 to
5153                  * emulate them for its L2 guest, i.e., allows 3-level nesting!
5154                  */
5155                 return true;
5156         case EXIT_REASON_CR_ACCESS:
5157                 return nested_vmx_exit_handled_cr(vcpu, vmcs12);
5158         case EXIT_REASON_DR_ACCESS:
5159                 return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
5160         case EXIT_REASON_IO_INSTRUCTION:
5161                 return nested_vmx_exit_handled_io(vcpu, vmcs12);
5162         case EXIT_REASON_GDTR_IDTR: case EXIT_REASON_LDTR_TR:
5163                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_DESC);
5164         case EXIT_REASON_MSR_READ:
5165         case EXIT_REASON_MSR_WRITE:
5166                 return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
5167         case EXIT_REASON_INVALID_STATE:
5168                 return true;
5169         case EXIT_REASON_MWAIT_INSTRUCTION:
5170                 return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
5171         case EXIT_REASON_MONITOR_TRAP_FLAG:
5172                 return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_TRAP_FLAG);
5173         case EXIT_REASON_MONITOR_INSTRUCTION:
5174                 return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
5175         case EXIT_REASON_PAUSE_INSTRUCTION:
5176                 return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
5177                         nested_cpu_has2(vmcs12,
5178                                 SECONDARY_EXEC_PAUSE_LOOP_EXITING);
5179         case EXIT_REASON_MCE_DURING_VMENTRY:
5180                 return false;
5181         case EXIT_REASON_TPR_BELOW_THRESHOLD:
5182                 return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW);
5183         case EXIT_REASON_APIC_ACCESS:
5184         case EXIT_REASON_APIC_WRITE:
5185         case EXIT_REASON_EOI_INDUCED:
5186                 /*
5187                  * The controls for "virtualize APIC accesses," "APIC-
5188                  * register virtualization," and "virtual-interrupt
5189                  * delivery" only come from vmcs12.
5190                  */
5191                 return true;
5192         case EXIT_REASON_EPT_VIOLATION:
5193                 /*
5194                  * L0 always deals with the EPT violation. If nested EPT is
5195                  * used, and the nested mmu code discovers that the address is
5196                  * missing in the guest EPT table (EPT12), the EPT violation
5197                  * will be injected with nested_ept_inject_page_fault()
5198                  */
5199                 return false;
5200         case EXIT_REASON_EPT_MISCONFIG:
5201                 /*
5202                  * L2 never uses directly L1's EPT, but rather L0's own EPT
5203                  * table (shadow on EPT) or a merged EPT table that L0 built
5204                  * (EPT on EPT). So any problems with the structure of the
5205                  * table is L0's fault.
5206                  */
5207                 return false;
5208         case EXIT_REASON_INVPCID:
5209                 return
5210                         nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_INVPCID) &&
5211                         nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
5212         case EXIT_REASON_WBINVD:
5213                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
5214         case EXIT_REASON_XSETBV:
5215                 return true;
5216         case EXIT_REASON_XSAVES: case EXIT_REASON_XRSTORS:
5217                 /*
5218                  * This should never happen, since it is not possible to
5219                  * set XSS to a non-zero value---neither in L1 nor in L2.
5220                  * If if it were, XSS would have to be checked against
5221                  * the XSS exit bitmap in vmcs12.
5222                  */
5223                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
5224         case EXIT_REASON_PREEMPTION_TIMER:
5225                 return false;
5226         case EXIT_REASON_PML_FULL:
5227                 /* We emulate PML support to L1. */
5228                 return false;
5229         case EXIT_REASON_VMFUNC:
5230                 /* VM functions are emulated through L2->L0 vmexits. */
5231                 return false;
5232         case EXIT_REASON_ENCLS:
5233                 /* SGX is never exposed to L1 */
5234                 return false;
5235         default:
5236                 return true;
5237         }
5238 }
5239
5240
5241 static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
5242                                 struct kvm_nested_state __user *user_kvm_nested_state,
5243                                 u32 user_data_size)
5244 {
5245         struct vcpu_vmx *vmx;
5246         struct vmcs12 *vmcs12;
5247         struct kvm_nested_state kvm_state = {
5248                 .flags = 0,
5249                 .format = 0,
5250                 .size = sizeof(kvm_state),
5251                 .vmx.vmxon_pa = -1ull,
5252                 .vmx.vmcs_pa = -1ull,
5253         };
5254
5255         if (!vcpu)
5256                 return kvm_state.size + 2 * VMCS12_SIZE;
5257
5258         vmx = to_vmx(vcpu);
5259         vmcs12 = get_vmcs12(vcpu);
5260
5261         if (nested_vmx_allowed(vcpu) && vmx->nested.enlightened_vmcs_enabled)
5262                 kvm_state.flags |= KVM_STATE_NESTED_EVMCS;
5263
5264         if (nested_vmx_allowed(vcpu) &&
5265             (vmx->nested.vmxon || vmx->nested.smm.vmxon)) {
5266                 kvm_state.vmx.vmxon_pa = vmx->nested.vmxon_ptr;
5267                 kvm_state.vmx.vmcs_pa = vmx->nested.current_vmptr;
5268
5269                 if (vmx_has_valid_vmcs12(vcpu)) {
5270                         kvm_state.size += VMCS12_SIZE;
5271
5272                         if (is_guest_mode(vcpu) &&
5273                             nested_cpu_has_shadow_vmcs(vmcs12) &&
5274                             vmcs12->vmcs_link_pointer != -1ull)
5275                                 kvm_state.size += VMCS12_SIZE;
5276                 }
5277
5278                 if (vmx->nested.smm.vmxon)
5279                         kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON;
5280
5281                 if (vmx->nested.smm.guest_mode)
5282                         kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_GUEST_MODE;
5283
5284                 if (is_guest_mode(vcpu)) {
5285                         kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
5286
5287                         if (vmx->nested.nested_run_pending)
5288                                 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
5289                 }
5290         }
5291
5292         if (user_data_size < kvm_state.size)
5293                 goto out;
5294
5295         if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
5296                 return -EFAULT;
5297
5298         if (!vmx_has_valid_vmcs12(vcpu))
5299                 goto out;
5300
5301         /*
5302          * When running L2, the authoritative vmcs12 state is in the
5303          * vmcs02. When running L1, the authoritative vmcs12 state is
5304          * in the shadow or enlightened vmcs linked to vmcs01, unless
5305          * need_vmcs12_sync is set, in which case, the authoritative
5306          * vmcs12 state is in the vmcs12 already.
5307          */
5308         if (is_guest_mode(vcpu)) {
5309                 sync_vmcs12(vcpu, vmcs12);
5310         } else if (!vmx->nested.need_vmcs12_sync) {
5311                 if (vmx->nested.hv_evmcs)
5312                         copy_enlightened_to_vmcs12(vmx);
5313                 else if (enable_shadow_vmcs)
5314                         copy_shadow_to_vmcs12(vmx);
5315         }
5316
5317         /*
5318          * Copy over the full allocated size of vmcs12 rather than just the size
5319          * of the struct.
5320          */
5321         if (copy_to_user(user_kvm_nested_state->data, vmcs12, VMCS12_SIZE))
5322                 return -EFAULT;
5323
5324         if (nested_cpu_has_shadow_vmcs(vmcs12) &&
5325             vmcs12->vmcs_link_pointer != -1ull) {
5326                 if (copy_to_user(user_kvm_nested_state->data + VMCS12_SIZE,
5327                                  get_shadow_vmcs12(vcpu), VMCS12_SIZE))
5328                         return -EFAULT;
5329         }
5330
5331 out:
5332         return kvm_state.size;
5333 }
5334
5335 /*
5336  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
5337  */
5338 void vmx_leave_nested(struct kvm_vcpu *vcpu)
5339 {
5340         if (is_guest_mode(vcpu)) {
5341                 to_vmx(vcpu)->nested.nested_run_pending = 0;
5342                 nested_vmx_vmexit(vcpu, -1, 0, 0);
5343         }
5344         free_nested(vcpu);
5345 }
5346
5347 static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
5348                                 struct kvm_nested_state __user *user_kvm_nested_state,
5349                                 struct kvm_nested_state *kvm_state)
5350 {
5351         struct vcpu_vmx *vmx = to_vmx(vcpu);
5352         struct vmcs12 *vmcs12;
5353         u32 exit_qual;
5354         int ret;
5355
5356         if (kvm_state->format != 0)
5357                 return -EINVAL;
5358
5359         if (kvm_state->flags & KVM_STATE_NESTED_EVMCS)
5360                 nested_enable_evmcs(vcpu, NULL);
5361
5362         if (!nested_vmx_allowed(vcpu))
5363                 return kvm_state->vmx.vmxon_pa == -1ull ? 0 : -EINVAL;
5364
5365         if (kvm_state->vmx.vmxon_pa == -1ull) {
5366                 if (kvm_state->vmx.smm.flags)
5367                         return -EINVAL;
5368
5369                 if (kvm_state->vmx.vmcs_pa != -1ull)
5370                         return -EINVAL;
5371
5372                 vmx_leave_nested(vcpu);
5373                 return 0;
5374         }
5375
5376         if (!page_address_valid(vcpu, kvm_state->vmx.vmxon_pa))
5377                 return -EINVAL;
5378
5379         if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
5380             (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
5381                 return -EINVAL;
5382
5383         if (kvm_state->vmx.smm.flags &
5384             ~(KVM_STATE_NESTED_SMM_GUEST_MODE | KVM_STATE_NESTED_SMM_VMXON))
5385                 return -EINVAL;
5386
5387         /*
5388          * SMM temporarily disables VMX, so we cannot be in guest mode,
5389          * nor can VMLAUNCH/VMRESUME be pending.  Outside SMM, SMM flags
5390          * must be zero.
5391          */
5392         if (is_smm(vcpu) ? kvm_state->flags : kvm_state->vmx.smm.flags)
5393                 return -EINVAL;
5394
5395         if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
5396             !(kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))
5397                 return -EINVAL;
5398
5399         vmx_leave_nested(vcpu);
5400         if (kvm_state->vmx.vmxon_pa == -1ull)
5401                 return 0;
5402
5403         vmx->nested.vmxon_ptr = kvm_state->vmx.vmxon_pa;
5404         ret = enter_vmx_operation(vcpu);
5405         if (ret)
5406                 return ret;
5407
5408         /* Empty 'VMXON' state is permitted */
5409         if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12))
5410                 return 0;
5411
5412         if (kvm_state->vmx.vmcs_pa != -1ull) {
5413                 if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa ||
5414                     !page_address_valid(vcpu, kvm_state->vmx.vmcs_pa))
5415                         return -EINVAL;
5416
5417                 set_current_vmptr(vmx, kvm_state->vmx.vmcs_pa);
5418         } else if (kvm_state->flags & KVM_STATE_NESTED_EVMCS) {
5419                 /*
5420                  * Sync eVMCS upon entry as we may not have
5421                  * HV_X64_MSR_VP_ASSIST_PAGE set up yet.
5422                  */
5423                 vmx->nested.need_vmcs12_sync = true;
5424         } else {
5425                 return -EINVAL;
5426         }
5427
5428         if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) {
5429                 vmx->nested.smm.vmxon = true;
5430                 vmx->nested.vmxon = false;
5431
5432                 if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE)
5433                         vmx->nested.smm.guest_mode = true;
5434         }
5435
5436         vmcs12 = get_vmcs12(vcpu);
5437         if (copy_from_user(vmcs12, user_kvm_nested_state->data, sizeof(*vmcs12)))
5438                 return -EFAULT;
5439
5440         if (vmcs12->hdr.revision_id != VMCS12_REVISION)
5441                 return -EINVAL;
5442
5443         if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
5444                 return 0;
5445
5446         vmx->nested.nested_run_pending =
5447                 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
5448
5449         if (nested_cpu_has_shadow_vmcs(vmcs12) &&
5450             vmcs12->vmcs_link_pointer != -1ull) {
5451                 struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
5452
5453                 if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12))
5454                         return -EINVAL;
5455
5456                 if (copy_from_user(shadow_vmcs12,
5457                                    user_kvm_nested_state->data + VMCS12_SIZE,
5458                                    sizeof(*vmcs12)))
5459                         return -EFAULT;
5460
5461                 if (shadow_vmcs12->hdr.revision_id != VMCS12_REVISION ||
5462                     !shadow_vmcs12->hdr.shadow_vmcs)
5463                         return -EINVAL;
5464         }
5465
5466         if (nested_vmx_check_vmentry_prereqs(vcpu, vmcs12) ||
5467             nested_vmx_check_vmentry_postreqs(vcpu, vmcs12, &exit_qual))
5468                 return -EINVAL;
5469
5470         vmx->nested.dirty_vmcs12 = true;
5471         ret = nested_vmx_enter_non_root_mode(vcpu, false);
5472         if (ret)
5473                 return -EINVAL;
5474
5475         return 0;
5476 }
5477
5478 void nested_vmx_vcpu_setup(void)
5479 {
5480         if (enable_shadow_vmcs) {
5481                 /*
5482                  * At vCPU creation, "VMWRITE to any supported field
5483                  * in the VMCS" is supported, so use the more
5484                  * permissive vmx_vmread_bitmap to specify both read
5485                  * and write permissions for the shadow VMCS.
5486                  */
5487                 vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
5488                 vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmread_bitmap));
5489         }
5490 }
5491
5492 /*
5493  * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
5494  * returned for the various VMX controls MSRs when nested VMX is enabled.
5495  * The same values should also be used to verify that vmcs12 control fields are
5496  * valid during nested entry from L1 to L2.
5497  * Each of these control msrs has a low and high 32-bit half: A low bit is on
5498  * if the corresponding bit in the (32-bit) control field *must* be on, and a
5499  * bit in the high half is on if the corresponding bit in the control field
5500  * may be on. See also vmx_control_verify().
5501  */
5502 void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps,
5503                                 bool apicv)
5504 {
5505         /*
5506          * Note that as a general rule, the high half of the MSRs (bits in
5507          * the control fields which may be 1) should be initialized by the
5508          * intersection of the underlying hardware's MSR (i.e., features which
5509          * can be supported) and the list of features we want to expose -
5510          * because they are known to be properly supported in our code.
5511          * Also, usually, the low half of the MSRs (bits which must be 1) can
5512          * be set to 0, meaning that L1 may turn off any of these bits. The
5513          * reason is that if one of these bits is necessary, it will appear
5514          * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
5515          * fields of vmcs01 and vmcs02, will turn these bits off - and
5516          * nested_vmx_exit_reflected() will not pass related exits to L1.
5517          * These rules have exceptions below.
5518          */
5519
5520         /* pin-based controls */
5521         rdmsr(MSR_IA32_VMX_PINBASED_CTLS,
5522                 msrs->pinbased_ctls_low,
5523                 msrs->pinbased_ctls_high);
5524         msrs->pinbased_ctls_low |=
5525                 PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
5526         msrs->pinbased_ctls_high &=
5527                 PIN_BASED_EXT_INTR_MASK |
5528                 PIN_BASED_NMI_EXITING |
5529                 PIN_BASED_VIRTUAL_NMIS |
5530                 (apicv ? PIN_BASED_POSTED_INTR : 0);
5531         msrs->pinbased_ctls_high |=
5532                 PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
5533                 PIN_BASED_VMX_PREEMPTION_TIMER;
5534
5535         /* exit controls */
5536         rdmsr(MSR_IA32_VMX_EXIT_CTLS,
5537                 msrs->exit_ctls_low,
5538                 msrs->exit_ctls_high);
5539         msrs->exit_ctls_low =
5540                 VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
5541
5542         msrs->exit_ctls_high &=
5543 #ifdef CONFIG_X86_64
5544                 VM_EXIT_HOST_ADDR_SPACE_SIZE |
5545 #endif
5546                 VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT;
5547         msrs->exit_ctls_high |=
5548                 VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
5549                 VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
5550                 VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT;
5551
5552         /* We support free control of debug control saving. */
5553         msrs->exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS;
5554
5555         /* entry controls */
5556         rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
5557                 msrs->entry_ctls_low,
5558                 msrs->entry_ctls_high);
5559         msrs->entry_ctls_low =
5560                 VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
5561         msrs->entry_ctls_high &=
5562 #ifdef CONFIG_X86_64
5563                 VM_ENTRY_IA32E_MODE |
5564 #endif
5565                 VM_ENTRY_LOAD_IA32_PAT;
5566         msrs->entry_ctls_high |=
5567                 (VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER);
5568
5569         /* We support free control of debug control loading. */
5570         msrs->entry_ctls_low &= ~VM_ENTRY_LOAD_DEBUG_CONTROLS;
5571
5572         /* cpu-based controls */
5573         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
5574                 msrs->procbased_ctls_low,
5575                 msrs->procbased_ctls_high);
5576         msrs->procbased_ctls_low =
5577                 CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
5578         msrs->procbased_ctls_high &=
5579                 CPU_BASED_VIRTUAL_INTR_PENDING |
5580                 CPU_BASED_VIRTUAL_NMI_PENDING | CPU_BASED_USE_TSC_OFFSETING |
5581                 CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
5582                 CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
5583                 CPU_BASED_CR3_STORE_EXITING |
5584 #ifdef CONFIG_X86_64
5585                 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
5586 #endif
5587                 CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
5588                 CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_TRAP_FLAG |
5589                 CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING |
5590                 CPU_BASED_RDTSC_EXITING | CPU_BASED_PAUSE_EXITING |
5591                 CPU_BASED_TPR_SHADOW | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
5592         /*
5593          * We can allow some features even when not supported by the
5594          * hardware. For example, L1 can specify an MSR bitmap - and we
5595          * can use it to avoid exits to L1 - even when L0 runs L2
5596          * without MSR bitmaps.
5597          */
5598         msrs->procbased_ctls_high |=
5599                 CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
5600                 CPU_BASED_USE_MSR_BITMAPS;
5601
5602         /* We support free control of CR3 access interception. */
5603         msrs->procbased_ctls_low &=
5604                 ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING);
5605
5606         /*
5607          * secondary cpu-based controls.  Do not include those that
5608          * depend on CPUID bits, they are added later by vmx_cpuid_update.
5609          */
5610         if (msrs->procbased_ctls_high & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)
5611                 rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
5612                       msrs->secondary_ctls_low,
5613                       msrs->secondary_ctls_high);
5614
5615         msrs->secondary_ctls_low = 0;
5616         msrs->secondary_ctls_high &=
5617                 SECONDARY_EXEC_DESC |
5618                 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
5619                 SECONDARY_EXEC_APIC_REGISTER_VIRT |
5620                 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
5621                 SECONDARY_EXEC_WBINVD_EXITING;
5622
5623         /*
5624          * We can emulate "VMCS shadowing," even if the hardware
5625          * doesn't support it.
5626          */
5627         msrs->secondary_ctls_high |=
5628                 SECONDARY_EXEC_SHADOW_VMCS;
5629
5630         if (enable_ept) {
5631                 /* nested EPT: emulate EPT also to L1 */
5632                 msrs->secondary_ctls_high |=
5633                         SECONDARY_EXEC_ENABLE_EPT;
5634                 msrs->ept_caps = VMX_EPT_PAGE_WALK_4_BIT |
5635                          VMX_EPTP_WB_BIT | VMX_EPT_INVEPT_BIT;
5636                 if (cpu_has_vmx_ept_execute_only())
5637                         msrs->ept_caps |=
5638                                 VMX_EPT_EXECUTE_ONLY_BIT;
5639                 msrs->ept_caps &= ept_caps;
5640                 msrs->ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT |
5641                         VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT |
5642                         VMX_EPT_1GB_PAGE_BIT;
5643                 if (enable_ept_ad_bits) {
5644                         msrs->secondary_ctls_high |=
5645                                 SECONDARY_EXEC_ENABLE_PML;
5646                         msrs->ept_caps |= VMX_EPT_AD_BIT;
5647                 }
5648         }
5649
5650         if (cpu_has_vmx_vmfunc()) {
5651                 msrs->secondary_ctls_high |=
5652                         SECONDARY_EXEC_ENABLE_VMFUNC;
5653                 /*
5654                  * Advertise EPTP switching unconditionally
5655                  * since we emulate it
5656                  */
5657                 if (enable_ept)
5658                         msrs->vmfunc_controls =
5659                                 VMX_VMFUNC_EPTP_SWITCHING;
5660         }
5661
5662         /*
5663          * Old versions of KVM use the single-context version without
5664          * checking for support, so declare that it is supported even
5665          * though it is treated as global context.  The alternative is
5666          * not failing the single-context invvpid, and it is worse.
5667          */
5668         if (enable_vpid) {
5669                 msrs->secondary_ctls_high |=
5670                         SECONDARY_EXEC_ENABLE_VPID;
5671                 msrs->vpid_caps = VMX_VPID_INVVPID_BIT |
5672                         VMX_VPID_EXTENT_SUPPORTED_MASK;
5673         }
5674
5675         if (enable_unrestricted_guest)
5676                 msrs->secondary_ctls_high |=
5677                         SECONDARY_EXEC_UNRESTRICTED_GUEST;
5678
5679         if (flexpriority_enabled)
5680                 msrs->secondary_ctls_high |=
5681                         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
5682
5683         /* miscellaneous data */
5684         rdmsr(MSR_IA32_VMX_MISC,
5685                 msrs->misc_low,
5686                 msrs->misc_high);
5687         msrs->misc_low &= VMX_MISC_SAVE_EFER_LMA;
5688         msrs->misc_low |=
5689                 MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
5690                 VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
5691                 VMX_MISC_ACTIVITY_HLT;
5692         msrs->misc_high = 0;
5693
5694         /*
5695          * This MSR reports some information about VMX support. We
5696          * should return information about the VMX we emulate for the
5697          * guest, and the VMCS structure we give it - not about the
5698          * VMX support of the underlying hardware.
5699          */
5700         msrs->basic =
5701                 VMCS12_REVISION |
5702                 VMX_BASIC_TRUE_CTLS |
5703                 ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
5704                 (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
5705
5706         if (cpu_has_vmx_basic_inout())
5707                 msrs->basic |= VMX_BASIC_INOUT;
5708
5709         /*
5710          * These MSRs specify bits which the guest must keep fixed on
5711          * while L1 is in VMXON mode (in L1's root mode, or running an L2).
5712          * We picked the standard core2 setting.
5713          */
5714 #define VMXON_CR0_ALWAYSON     (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
5715 #define VMXON_CR4_ALWAYSON     X86_CR4_VMXE
5716         msrs->cr0_fixed0 = VMXON_CR0_ALWAYSON;
5717         msrs->cr4_fixed0 = VMXON_CR4_ALWAYSON;
5718
5719         /* These MSRs specify bits which the guest must keep fixed off. */
5720         rdmsrl(MSR_IA32_VMX_CR0_FIXED1, msrs->cr0_fixed1);
5721         rdmsrl(MSR_IA32_VMX_CR4_FIXED1, msrs->cr4_fixed1);
5722
5723         /* highest index: VMX_PREEMPTION_TIMER_VALUE */
5724         msrs->vmcs_enum = VMCS12_MAX_FIELD_INDEX << 1;
5725 }
5726
5727 void nested_vmx_hardware_unsetup(void)
5728 {
5729         int i;
5730
5731         if (enable_shadow_vmcs) {
5732                 for (i = 0; i < VMX_BITMAP_NR; i++)
5733                         free_page((unsigned long)vmx_bitmap[i]);
5734         }
5735 }
5736
5737 __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
5738 {
5739         int i;
5740
5741         if (!cpu_has_vmx_shadow_vmcs())
5742                 enable_shadow_vmcs = 0;
5743         if (enable_shadow_vmcs) {
5744                 for (i = 0; i < VMX_BITMAP_NR; i++) {
5745                         /*
5746                          * The vmx_bitmap is not tied to a VM and so should
5747                          * not be charged to a memcg.
5748                          */
5749                         vmx_bitmap[i] = (unsigned long *)
5750                                 __get_free_page(GFP_KERNEL);
5751                         if (!vmx_bitmap[i]) {
5752                                 nested_vmx_hardware_unsetup();
5753                                 return -ENOMEM;
5754                         }
5755                 }
5756
5757                 init_vmcs_shadow_fields();
5758         }
5759
5760         exit_handlers[EXIT_REASON_VMCLEAR]      = handle_vmclear,
5761         exit_handlers[EXIT_REASON_VMLAUNCH]     = handle_vmlaunch,
5762         exit_handlers[EXIT_REASON_VMPTRLD]      = handle_vmptrld,
5763         exit_handlers[EXIT_REASON_VMPTRST]      = handle_vmptrst,
5764         exit_handlers[EXIT_REASON_VMREAD]       = handle_vmread,
5765         exit_handlers[EXIT_REASON_VMRESUME]     = handle_vmresume,
5766         exit_handlers[EXIT_REASON_VMWRITE]      = handle_vmwrite,
5767         exit_handlers[EXIT_REASON_VMOFF]        = handle_vmoff,
5768         exit_handlers[EXIT_REASON_VMON]         = handle_vmon,
5769         exit_handlers[EXIT_REASON_INVEPT]       = handle_invept,
5770         exit_handlers[EXIT_REASON_INVVPID]      = handle_invvpid,
5771         exit_handlers[EXIT_REASON_VMFUNC]       = handle_vmfunc,
5772
5773         kvm_x86_ops->check_nested_events = vmx_check_nested_events;
5774         kvm_x86_ops->get_nested_state = vmx_get_nested_state;
5775         kvm_x86_ops->set_nested_state = vmx_set_nested_state;
5776         kvm_x86_ops->get_vmcs12_pages = nested_get_vmcs12_pages,
5777         kvm_x86_ops->nested_enable_evmcs = nested_enable_evmcs;
5778         kvm_x86_ops->nested_get_evmcs_version = nested_get_evmcs_version;
5779
5780         return 0;
5781 }