arch/x86/kvm/svm/nested.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Kernel-based Virtual Machine driver for Linux
   4  *
   5  * AMD SVM support
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *   Avi Kivity   <avi@qumranet.com>
  13  */
  14
  15 #define pr_fmt(fmt) "SVM: " fmt
  16
  17 #include <linux/kvm_types.h>
  18 #include <linux/kvm_host.h>
  19 #include <linux/kernel.h>
  20
  21 #include <asm/msr-index.h>
  22 #include <asm/debugreg.h>
  23
  24 #include "kvm_emulate.h"
  25 #include "trace.h"
  26 #include "mmu.h"
  27 #include "x86.h"
  28 #include "cpuid.h"
  29 #include "lapic.h"
  30 #include "svm.h"
  31
  32 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
  33                                        struct x86_exception *fault)
  34 {
  35         struct vcpu_svm *svm = to_svm(vcpu);
  36
  37         if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
  38                 /*
  39                  * TODO: track the cause of the nested page fault, and
  40                  * correctly fill in the high bits of exit_info_1.
  41                  */
  42                 svm->vmcb->control.exit_code = SVM_EXIT_NPF;
  43                 svm->vmcb->control.exit_code_hi = 0;
  44                 svm->vmcb->control.exit_info_1 = (1ULL << 32);
  45                 svm->vmcb->control.exit_info_2 = fault->address;
  46         }
  47
  48         svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
  49         svm->vmcb->control.exit_info_1 |= fault->error_code;
  50
  51         nested_svm_vmexit(svm);
  52 }
  53
  54 static void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault)
  55 {
  56        struct vcpu_svm *svm = to_svm(vcpu);
  57        WARN_ON(!is_guest_mode(vcpu));
  58
  59        if (vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) &&
  60            !svm->nested.nested_run_pending) {
  61                svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
  62                svm->vmcb->control.exit_code_hi = 0;
  63                svm->vmcb->control.exit_info_1 = fault->error_code;
  64                svm->vmcb->control.exit_info_2 = fault->address;
  65                nested_svm_vmexit(svm);
  66        } else {
  67                kvm_inject_page_fault(vcpu, fault);
  68        }
  69 }
  70
  71 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
  72 {
  73         struct vcpu_svm *svm = to_svm(vcpu);
  74         u64 cr3 = svm->nested.ctl.nested_cr3;
  75         u64 pdpte;
  76         int ret;
  77
  78         ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte,
  79                                        offset_in_page(cr3) + index * 8, 8);
  80         if (ret)
  81                 return 0;
  82         return pdpte;
  83 }
  84
  85 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
  86 {
  87         struct vcpu_svm *svm = to_svm(vcpu);
  88
  89         return svm->nested.ctl.nested_cr3;
  90 }
  91
  92 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
  93 {
  94         struct vcpu_svm *svm = to_svm(vcpu);
  95         struct vmcb *hsave = svm->nested.hsave;
  96
  97         WARN_ON(mmu_is_nested(vcpu));
  98
  99         vcpu->arch.mmu = &vcpu->arch.guest_mmu;
 100         kvm_init_shadow_npt_mmu(vcpu, X86_CR0_PG, hsave->save.cr4, hsave->save.efer,
 101                                 svm->nested.ctl.nested_cr3);
 102         vcpu->arch.mmu->get_guest_pgd     = nested_svm_get_tdp_cr3;
 103         vcpu->arch.mmu->get_pdptr         = nested_svm_get_tdp_pdptr;
 104         vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
 105         reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu);
 106         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
 107 }
 108
 109 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
 110 {
 111         vcpu->arch.mmu = &vcpu->arch.root_mmu;
 112         vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
 113 }
 114
 115 void recalc_intercepts(struct vcpu_svm *svm)
 116 {
 117         struct vmcb_control_area *c, *h, *g;
 118         unsigned int i;
 119
 120         vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 121
 122         if (!is_guest_mode(&svm->vcpu))
 123                 return;
 124
 125         c = &svm->vmcb->control;
 126         h = &svm->nested.hsave->control;
 127         g = &svm->nested.ctl;
 128
 129         for (i = 0; i < MAX_INTERCEPT; i++)
 130                 c->intercepts[i] = h->intercepts[i];
 131
 132         if (g->int_ctl & V_INTR_MASKING_MASK) {
 133                 /* We only want the cr8 intercept bits of L1 */
 134                 vmcb_clr_intercept(c, INTERCEPT_CR8_READ);
 135                 vmcb_clr_intercept(c, INTERCEPT_CR8_WRITE);
 136
 137                 /*
 138                  * Once running L2 with HF_VINTR_MASK, EFLAGS.IF does not
 139                  * affect any interrupt we may want to inject; therefore,
 140                  * interrupt window vmexits are irrelevant to L0.
 141                  */
 142                 vmcb_clr_intercept(c, INTERCEPT_VINTR);
 143         }
 144
 145         /* We don't want to see VMMCALLs from a nested guest */
 146         vmcb_clr_intercept(c, INTERCEPT_VMMCALL);
 147
 148         for (i = 0; i < MAX_INTERCEPT; i++)
 149                 c->intercepts[i] |= g->intercepts[i];
 150 }
 151
 152 static void copy_vmcb_control_area(struct vmcb_control_area *dst,
 153                                    struct vmcb_control_area *from)
 154 {
 155         unsigned int i;
 156
 157         for (i = 0; i < MAX_INTERCEPT; i++)
 158                 dst->intercepts[i] = from->intercepts[i];
 159
 160         dst->iopm_base_pa         = from->iopm_base_pa;
 161         dst->msrpm_base_pa        = from->msrpm_base_pa;
 162         dst->tsc_offset           = from->tsc_offset;
 163         /* asid not copied, it is handled manually for svm->vmcb.  */
 164         dst->tlb_ctl              = from->tlb_ctl;
 165         dst->int_ctl              = from->int_ctl;
 166         dst->int_vector           = from->int_vector;
 167         dst->int_state            = from->int_state;
 168         dst->exit_code            = from->exit_code;
 169         dst->exit_code_hi         = from->exit_code_hi;
 170         dst->exit_info_1          = from->exit_info_1;
 171         dst->exit_info_2          = from->exit_info_2;
 172         dst->exit_int_info        = from->exit_int_info;
 173         dst->exit_int_info_err    = from->exit_int_info_err;
 174         dst->nested_ctl           = from->nested_ctl;
 175         dst->event_inj            = from->event_inj;
 176         dst->event_inj_err        = from->event_inj_err;
 177         dst->nested_cr3           = from->nested_cr3;
 178         dst->virt_ext              = from->virt_ext;
 179         dst->pause_filter_count   = from->pause_filter_count;
 180         dst->pause_filter_thresh  = from->pause_filter_thresh;
 181 }
 182
 183 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
 184 {
 185         /*
 186          * This function merges the msr permission bitmaps of kvm and the
 187          * nested vmcb. It is optimized in that it only merges the parts where
 188          * the kvm msr permission bitmap may contain zero bits
 189          */
 190         int i;
 191
 192         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
 193                 return true;
 194
 195         for (i = 0; i < MSRPM_OFFSETS; i++) {
 196                 u32 value, p;
 197                 u64 offset;
 198
 199                 if (msrpm_offsets[i] == 0xffffffff)
 200                         break;
 201
 202                 p      = msrpm_offsets[i];
 203                 offset = svm->nested.ctl.msrpm_base_pa + (p * 4);
 204
 205                 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
 206                         return false;
 207
 208                 svm->nested.msrpm[p] = svm->msrpm[p] | value;
 209         }
 210
 211         svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
 212
 213         return true;
 214 }
 215
 216 static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
 217 {
 218         struct vcpu_svm *svm = to_svm(vcpu);
 219
 220         if (WARN_ON(!is_guest_mode(vcpu)))
 221                 return true;
 222
 223         if (!nested_svm_vmrun_msrpm(svm)) {
 224                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 225                 vcpu->run->internal.suberror =
 226                         KVM_INTERNAL_ERROR_EMULATION;
 227                 vcpu->run->internal.ndata = 0;
 228                 return false;
 229         }
 230
 231         return true;
 232 }
 233
 234 static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
 235 {
 236         if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0)
 237                 return false;
 238
 239         if (control->asid == 0)
 240                 return false;
 241
 242         if ((control->nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
 243             !npt_enabled)
 244                 return false;
 245
 246         return true;
 247 }
 248
 249 static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12)
 250 {
 251         struct kvm_vcpu *vcpu = &svm->vcpu;
 252         bool vmcb12_lma;
 253
 254         if ((vmcb12->save.efer & EFER_SVME) == 0)
 255                 return false;
 256
 257         if (((vmcb12->save.cr0 & X86_CR0_CD) == 0) && (vmcb12->save.cr0 & X86_CR0_NW))
 258                 return false;
 259
 260         if (!kvm_dr6_valid(vmcb12->save.dr6) || !kvm_dr7_valid(vmcb12->save.dr7))
 261                 return false;
 262
 263         vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG);
 264
 265         if (vmcb12_lma) {
 266                 if (!(vmcb12->save.cr4 & X86_CR4_PAE) ||
 267                     !(vmcb12->save.cr0 & X86_CR0_PE) ||
 268                     kvm_vcpu_is_illegal_gpa(vcpu, vmcb12->save.cr3))
 269                         return false;
 270         }
 271         if (!kvm_is_valid_cr4(&svm->vcpu, vmcb12->save.cr4))
 272                 return false;
 273
 274         return nested_vmcb_check_controls(&vmcb12->control);
 275 }
 276
 277 static void load_nested_vmcb_control(struct vcpu_svm *svm,
 278                                      struct vmcb_control_area *control)
 279 {
 280         copy_vmcb_control_area(&svm->nested.ctl, control);
 281
 282         /* Copy it here because nested_svm_check_controls will check it.  */
 283         svm->nested.ctl.asid           = control->asid;
 284         svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL;
 285         svm->nested.ctl.iopm_base_pa  &= ~0x0fffULL;
 286 }
 287
 288 /*
 289  * Synchronize fields that are written by the processor, so that
 290  * they can be copied back into the nested_vmcb.
 291  */
 292 void sync_nested_vmcb_control(struct vcpu_svm *svm)
 293 {
 294         u32 mask;
 295         svm->nested.ctl.event_inj      = svm->vmcb->control.event_inj;
 296         svm->nested.ctl.event_inj_err  = svm->vmcb->control.event_inj_err;
 297
 298         /* Only a few fields of int_ctl are written by the processor.  */
 299         mask = V_IRQ_MASK | V_TPR_MASK;
 300         if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) &&
 301             svm_is_intercept(svm, INTERCEPT_VINTR)) {
 302                 /*
 303                  * In order to request an interrupt window, L0 is usurping
 304                  * svm->vmcb->control.int_ctl and possibly setting V_IRQ
 305                  * even if it was clear in L1's VMCB.  Restoring it would be
 306                  * wrong.  However, in this case V_IRQ will remain true until
 307                  * interrupt_window_interception calls svm_clear_vintr and
 308                  * restores int_ctl.  We can just leave it aside.
 309                  */
 310                 mask &= ~V_IRQ_MASK;
 311         }
 312         svm->nested.ctl.int_ctl        &= ~mask;
 313         svm->nested.ctl.int_ctl        |= svm->vmcb->control.int_ctl & mask;
 314 }
 315
 316 /*
 317  * Transfer any event that L0 or L1 wanted to inject into L2 to
 318  * EXIT_INT_INFO.
 319  */
 320 static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
 321                                            struct vmcb *vmcb12)
 322 {
 323         struct kvm_vcpu *vcpu = &svm->vcpu;
 324         u32 exit_int_info = 0;
 325         unsigned int nr;
 326
 327         if (vcpu->arch.exception.injected) {
 328                 nr = vcpu->arch.exception.nr;
 329                 exit_int_info = nr | SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_EXEPT;
 330
 331                 if (vcpu->arch.exception.has_error_code) {
 332                         exit_int_info |= SVM_EVTINJ_VALID_ERR;
 333                         vmcb12->control.exit_int_info_err =
 334                                 vcpu->arch.exception.error_code;
 335                 }
 336
 337         } else if (vcpu->arch.nmi_injected) {
 338                 exit_int_info = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
 339
 340         } else if (vcpu->arch.interrupt.injected) {
 341                 nr = vcpu->arch.interrupt.nr;
 342                 exit_int_info = nr | SVM_EVTINJ_VALID;
 343
 344                 if (vcpu->arch.interrupt.soft)
 345                         exit_int_info |= SVM_EVTINJ_TYPE_SOFT;
 346                 else
 347                         exit_int_info |= SVM_EVTINJ_TYPE_INTR;
 348         }
 349
 350         vmcb12->control.exit_int_info = exit_int_info;
 351 }
 352
 353 static inline bool nested_npt_enabled(struct vcpu_svm *svm)
 354 {
 355         return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
 356 }
 357
 358 /*
 359  * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
 360  * if we are emulating VM-Entry into a guest with NPT enabled.
 361  */
 362 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
 363                                bool nested_npt)
 364 {
 365         if (kvm_vcpu_is_illegal_gpa(vcpu, cr3))
 366                 return -EINVAL;
 367
 368         if (!nested_npt && is_pae_paging(vcpu) &&
 369             (cr3 != kvm_read_cr3(vcpu) || pdptrs_changed(vcpu))) {
 370                 if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 371                         return -EINVAL;
 372         }
 373
 374         /*
 375          * TODO: optimize unconditional TLB flush/MMU sync here and in
 376          * kvm_init_shadow_npt_mmu().
 377          */
 378         if (!nested_npt)
 379                 kvm_mmu_new_pgd(vcpu, cr3, false, false);
 380
 381         vcpu->arch.cr3 = cr3;
 382         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
 383
 384         kvm_init_mmu(vcpu, false);
 385
 386         return 0;
 387 }
 388
 389 static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
 390 {
 391         /* Load the nested guest state */
 392         svm->vmcb->save.es = vmcb12->save.es;
 393         svm->vmcb->save.cs = vmcb12->save.cs;
 394         svm->vmcb->save.ss = vmcb12->save.ss;
 395         svm->vmcb->save.ds = vmcb12->save.ds;
 396         svm->vmcb->save.gdtr = vmcb12->save.gdtr;
 397         svm->vmcb->save.idtr = vmcb12->save.idtr;
 398         kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
 399         svm_set_efer(&svm->vcpu, vmcb12->save.efer);
 400         svm_set_cr0(&svm->vcpu, vmcb12->save.cr0);
 401         svm_set_cr4(&svm->vcpu, vmcb12->save.cr4);
 402         svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = vmcb12->save.cr2;
 403         kvm_rax_write(&svm->vcpu, vmcb12->save.rax);
 404         kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp);
 405         kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
 406
 407         /* In case we don't even reach vcpu_run, the fields are not updated */
 408         svm->vmcb->save.rax = vmcb12->save.rax;
 409         svm->vmcb->save.rsp = vmcb12->save.rsp;
 410         svm->vmcb->save.rip = vmcb12->save.rip;
 411         svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1;
 412         svm->vcpu.arch.dr6  = vmcb12->save.dr6 | DR6_ACTIVE_LOW;
 413         svm->vmcb->save.cpl = vmcb12->save.cpl;
 414 }
 415
 416 static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
 417 {
 418         const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK;
 419
 420         if (nested_npt_enabled(svm))
 421                 nested_svm_init_mmu_context(&svm->vcpu);
 422
 423         svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
 424                 svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset;
 425
 426         svm->vmcb->control.int_ctl             =
 427                 (svm->nested.ctl.int_ctl & ~mask) |
 428                 (svm->nested.hsave->control.int_ctl & mask);
 429
 430         svm->vmcb->control.virt_ext            = svm->nested.ctl.virt_ext;
 431         svm->vmcb->control.int_vector          = svm->nested.ctl.int_vector;
 432         svm->vmcb->control.int_state           = svm->nested.ctl.int_state;
 433         svm->vmcb->control.event_inj           = svm->nested.ctl.event_inj;
 434         svm->vmcb->control.event_inj_err       = svm->nested.ctl.event_inj_err;
 435
 436         svm->vmcb->control.pause_filter_count  = svm->nested.ctl.pause_filter_count;
 437         svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh;
 438
 439         /* Enter Guest-Mode */
 440         enter_guest_mode(&svm->vcpu);
 441
 442         /*
 443          * Merge guest and host intercepts - must be called  with vcpu in
 444          * guest-mode to take affect here
 445          */
 446         recalc_intercepts(svm);
 447
 448         vmcb_mark_all_dirty(svm->vmcb);
 449 }
 450
 451 int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb12_gpa,
 452                          struct vmcb *vmcb12)
 453 {
 454         int ret;
 455
 456         trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb12_gpa,
 457                                vmcb12->save.rip,
 458                                vmcb12->control.int_ctl,
 459                                vmcb12->control.event_inj,
 460                                vmcb12->control.nested_ctl);
 461
 462         trace_kvm_nested_intercepts(vmcb12->control.intercepts[INTERCEPT_CR] & 0xffff,
 463                                     vmcb12->control.intercepts[INTERCEPT_CR] >> 16,
 464                                     vmcb12->control.intercepts[INTERCEPT_EXCEPTION],
 465                                     vmcb12->control.intercepts[INTERCEPT_WORD3],
 466                                     vmcb12->control.intercepts[INTERCEPT_WORD4],
 467                                     vmcb12->control.intercepts[INTERCEPT_WORD5]);
 468
 469
 470         svm->nested.vmcb12_gpa = vmcb12_gpa;
 471         load_nested_vmcb_control(svm, &vmcb12->control);
 472         nested_prepare_vmcb_control(svm);
 473         nested_prepare_vmcb_save(svm, vmcb12);
 474
 475         ret = nested_svm_load_cr3(&svm->vcpu, vmcb12->save.cr3,
 476                                   nested_npt_enabled(svm));
 477         if (ret)
 478                 return ret;
 479
 480         if (!npt_enabled)
 481                 svm->vcpu.arch.mmu->inject_page_fault = svm_inject_page_fault_nested;
 482
 483         svm_set_gif(svm, true);
 484
 485         return 0;
 486 }
 487
 488 int nested_svm_vmrun(struct vcpu_svm *svm)
 489 {
 490         int ret;
 491         struct vmcb *vmcb12;
 492         struct vmcb *hsave = svm->nested.hsave;
 493         struct vmcb *vmcb = svm->vmcb;
 494         struct kvm_host_map map;
 495         u64 vmcb12_gpa;
 496
 497         if (is_smm(&svm->vcpu)) {
 498                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
 499                 return 1;
 500         }
 501
 502         vmcb12_gpa = svm->vmcb->save.rax;
 503         ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb12_gpa), &map);
 504         if (ret == -EINVAL) {
 505                 kvm_inject_gp(&svm->vcpu, 0);
 506                 return 1;
 507         } else if (ret) {
 508                 return kvm_skip_emulated_instruction(&svm->vcpu);
 509         }
 510
 511         ret = kvm_skip_emulated_instruction(&svm->vcpu);
 512
 513         vmcb12 = map.hva;
 514
 515         if (WARN_ON_ONCE(!svm->nested.initialized))
 516                 return -EINVAL;
 517
 518         if (!nested_vmcb_checks(svm, vmcb12)) {
 519                 vmcb12->control.exit_code    = SVM_EXIT_ERR;
 520                 vmcb12->control.exit_code_hi = 0;
 521                 vmcb12->control.exit_info_1  = 0;
 522                 vmcb12->control.exit_info_2  = 0;
 523                 goto out;
 524         }
 525
 526
 527         /* Clear internal status */
 528         kvm_clear_exception_queue(&svm->vcpu);
 529         kvm_clear_interrupt_queue(&svm->vcpu);
 530
 531         /*
 532          * Save the old vmcb, so we don't need to pick what we save, but can
 533          * restore everything when a VMEXIT occurs
 534          */
 535         hsave->save.es     = vmcb->save.es;
 536         hsave->save.cs     = vmcb->save.cs;
 537         hsave->save.ss     = vmcb->save.ss;
 538         hsave->save.ds     = vmcb->save.ds;
 539         hsave->save.gdtr   = vmcb->save.gdtr;
 540         hsave->save.idtr   = vmcb->save.idtr;
 541         hsave->save.efer   = svm->vcpu.arch.efer;
 542         hsave->save.cr0    = kvm_read_cr0(&svm->vcpu);
 543         hsave->save.cr4    = svm->vcpu.arch.cr4;
 544         hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
 545         hsave->save.rip    = kvm_rip_read(&svm->vcpu);
 546         hsave->save.rsp    = vmcb->save.rsp;
 547         hsave->save.rax    = vmcb->save.rax;
 548         if (npt_enabled)
 549                 hsave->save.cr3    = vmcb->save.cr3;
 550         else
 551                 hsave->save.cr3    = kvm_read_cr3(&svm->vcpu);
 552
 553         copy_vmcb_control_area(&hsave->control, &vmcb->control);
 554
 555         svm->nested.nested_run_pending = 1;
 556
 557         if (enter_svm_guest_mode(svm, vmcb12_gpa, vmcb12))
 558                 goto out_exit_err;
 559
 560         if (nested_svm_vmrun_msrpm(svm))
 561                 goto out;
 562
 563 out_exit_err:
 564         svm->nested.nested_run_pending = 0;
 565
 566         svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
 567         svm->vmcb->control.exit_code_hi = 0;
 568         svm->vmcb->control.exit_info_1  = 0;
 569         svm->vmcb->control.exit_info_2  = 0;
 570
 571         nested_svm_vmexit(svm);
 572
 573 out:
 574         kvm_vcpu_unmap(&svm->vcpu, &map, true);
 575
 576         return ret;
 577 }
 578
 579 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
 580 {
 581         to_vmcb->save.fs = from_vmcb->save.fs;
 582         to_vmcb->save.gs = from_vmcb->save.gs;
 583         to_vmcb->save.tr = from_vmcb->save.tr;
 584         to_vmcb->save.ldtr = from_vmcb->save.ldtr;
 585         to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
 586         to_vmcb->save.star = from_vmcb->save.star;
 587         to_vmcb->save.lstar = from_vmcb->save.lstar;
 588         to_vmcb->save.cstar = from_vmcb->save.cstar;
 589         to_vmcb->save.sfmask = from_vmcb->save.sfmask;
 590         to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
 591         to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
 592         to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
 593 }
 594
 595 int nested_svm_vmexit(struct vcpu_svm *svm)
 596 {
 597         int rc;
 598         struct vmcb *vmcb12;
 599         struct vmcb *hsave = svm->nested.hsave;
 600         struct vmcb *vmcb = svm->vmcb;
 601         struct kvm_host_map map;
 602
 603         rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
 604         if (rc) {
 605                 if (rc == -EINVAL)
 606                         kvm_inject_gp(&svm->vcpu, 0);
 607                 return 1;
 608         }
 609
 610         vmcb12 = map.hva;
 611
 612         /* Exit Guest-Mode */
 613         leave_guest_mode(&svm->vcpu);
 614         svm->nested.vmcb12_gpa = 0;
 615         WARN_ON_ONCE(svm->nested.nested_run_pending);
 616
 617         kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu);
 618
 619         /* in case we halted in L2 */
 620         svm->vcpu.arch.mp_state = KVM_MP_STATE_RUNNABLE;
 621
 622         /* Give the current vmcb to the guest */
 623
 624         vmcb12->save.es     = vmcb->save.es;
 625         vmcb12->save.cs     = vmcb->save.cs;
 626         vmcb12->save.ss     = vmcb->save.ss;
 627         vmcb12->save.ds     = vmcb->save.ds;
 628         vmcb12->save.gdtr   = vmcb->save.gdtr;
 629         vmcb12->save.idtr   = vmcb->save.idtr;
 630         vmcb12->save.efer   = svm->vcpu.arch.efer;
 631         vmcb12->save.cr0    = kvm_read_cr0(&svm->vcpu);
 632         vmcb12->save.cr3    = kvm_read_cr3(&svm->vcpu);
 633         vmcb12->save.cr2    = vmcb->save.cr2;
 634         vmcb12->save.cr4    = svm->vcpu.arch.cr4;
 635         vmcb12->save.rflags = kvm_get_rflags(&svm->vcpu);
 636         vmcb12->save.rip    = kvm_rip_read(&svm->vcpu);
 637         vmcb12->save.rsp    = kvm_rsp_read(&svm->vcpu);
 638         vmcb12->save.rax    = kvm_rax_read(&svm->vcpu);
 639         vmcb12->save.dr7    = vmcb->save.dr7;
 640         vmcb12->save.dr6    = svm->vcpu.arch.dr6;
 641         vmcb12->save.cpl    = vmcb->save.cpl;
 642
 643         vmcb12->control.int_state         = vmcb->control.int_state;
 644         vmcb12->control.exit_code         = vmcb->control.exit_code;
 645         vmcb12->control.exit_code_hi      = vmcb->control.exit_code_hi;
 646         vmcb12->control.exit_info_1       = vmcb->control.exit_info_1;
 647         vmcb12->control.exit_info_2       = vmcb->control.exit_info_2;
 648
 649         if (vmcb12->control.exit_code != SVM_EXIT_ERR)
 650                 nested_vmcb_save_pending_event(svm, vmcb12);
 651
 652         if (svm->nrips_enabled)
 653                 vmcb12->control.next_rip  = vmcb->control.next_rip;
 654
 655         vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
 656         vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
 657         vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
 658         vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
 659
 660         vmcb12->control.pause_filter_count =
 661                 svm->vmcb->control.pause_filter_count;
 662         vmcb12->control.pause_filter_thresh =
 663                 svm->vmcb->control.pause_filter_thresh;
 664
 665         /* Restore the original control entries */
 666         copy_vmcb_control_area(&vmcb->control, &hsave->control);
 667
 668         /* On vmexit the  GIF is set to false */
 669         svm_set_gif(svm, false);
 670
 671         svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset =
 672                 svm->vcpu.arch.l1_tsc_offset;
 673
 674         svm->nested.ctl.nested_cr3 = 0;
 675
 676         /* Restore selected save entries */
 677         svm->vmcb->save.es = hsave->save.es;
 678         svm->vmcb->save.cs = hsave->save.cs;
 679         svm->vmcb->save.ss = hsave->save.ss;
 680         svm->vmcb->save.ds = hsave->save.ds;
 681         svm->vmcb->save.gdtr = hsave->save.gdtr;
 682         svm->vmcb->save.idtr = hsave->save.idtr;
 683         kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
 684         kvm_set_rflags(&svm->vcpu, hsave->save.rflags | X86_EFLAGS_FIXED);
 685         svm_set_efer(&svm->vcpu, hsave->save.efer);
 686         svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
 687         svm_set_cr4(&svm->vcpu, hsave->save.cr4);
 688         kvm_rax_write(&svm->vcpu, hsave->save.rax);
 689         kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
 690         kvm_rip_write(&svm->vcpu, hsave->save.rip);
 691         svm->vmcb->save.dr7 = DR7_FIXED_1;
 692         svm->vmcb->save.cpl = 0;
 693         svm->vmcb->control.exit_int_info = 0;
 694
 695         vmcb_mark_all_dirty(svm->vmcb);
 696
 697         trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code,
 698                                        vmcb12->control.exit_info_1,
 699                                        vmcb12->control.exit_info_2,
 700                                        vmcb12->control.exit_int_info,
 701                                        vmcb12->control.exit_int_info_err,
 702                                        KVM_ISA_SVM);
 703
 704         kvm_vcpu_unmap(&svm->vcpu, &map, true);
 705
 706         nested_svm_uninit_mmu_context(&svm->vcpu);
 707
 708         rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false);
 709         if (rc)
 710                 return 1;
 711
 712         if (npt_enabled)
 713                 svm->vmcb->save.cr3 = hsave->save.cr3;
 714
 715         /*
 716          * Drop what we picked up for L2 via svm_complete_interrupts() so it
 717          * doesn't end up in L1.
 718          */
 719         svm->vcpu.arch.nmi_injected = false;
 720         kvm_clear_exception_queue(&svm->vcpu);
 721         kvm_clear_interrupt_queue(&svm->vcpu);
 722
 723         return 0;
 724 }
 725
 726 int svm_allocate_nested(struct vcpu_svm *svm)
 727 {
 728         struct page *hsave_page;
 729
 730         if (svm->nested.initialized)
 731                 return 0;
 732
 733         hsave_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
 734         if (!hsave_page)
 735                 return -ENOMEM;
 736         svm->nested.hsave = page_address(hsave_page);
 737
 738         svm->nested.msrpm = svm_vcpu_alloc_msrpm();
 739         if (!svm->nested.msrpm)
 740                 goto err_free_hsave;
 741         svm_vcpu_init_msrpm(&svm->vcpu, svm->nested.msrpm);
 742
 743         svm->nested.initialized = true;
 744         return 0;
 745
 746 err_free_hsave:
 747         __free_page(hsave_page);
 748         return -ENOMEM;
 749 }
 750
 751 void svm_free_nested(struct vcpu_svm *svm)
 752 {
 753         if (!svm->nested.initialized)
 754                 return;
 755
 756         svm_vcpu_free_msrpm(svm->nested.msrpm);
 757         svm->nested.msrpm = NULL;
 758
 759         __free_page(virt_to_page(svm->nested.hsave));
 760         svm->nested.hsave = NULL;
 761
 762         svm->nested.initialized = false;
 763 }
 764
 765 /*
 766  * Forcibly leave nested mode in order to be able to reset the VCPU later on.
 767  */
 768 void svm_leave_nested(struct vcpu_svm *svm)
 769 {
 770         if (is_guest_mode(&svm->vcpu)) {
 771                 struct vmcb *hsave = svm->nested.hsave;
 772                 struct vmcb *vmcb = svm->vmcb;
 773
 774                 svm->nested.nested_run_pending = 0;
 775                 leave_guest_mode(&svm->vcpu);
 776                 copy_vmcb_control_area(&vmcb->control, &hsave->control);
 777                 nested_svm_uninit_mmu_context(&svm->vcpu);
 778                 vmcb_mark_all_dirty(svm->vmcb);
 779         }
 780
 781         kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, &svm->vcpu);
 782 }
 783
 784 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
 785 {
 786         u32 offset, msr, value;
 787         int write, mask;
 788
 789         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
 790                 return NESTED_EXIT_HOST;
 791
 792         msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
 793         offset = svm_msrpm_offset(msr);
 794         write  = svm->vmcb->control.exit_info_1 & 1;
 795         mask   = 1 << ((2 * (msr & 0xf)) + write);
 796
 797         if (offset == MSR_INVALID)
 798                 return NESTED_EXIT_DONE;
 799
 800         /* Offset is in 32 bit units but need in 8 bit units */
 801         offset *= 4;
 802
 803         if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.ctl.msrpm_base_pa + offset, &value, 4))
 804                 return NESTED_EXIT_DONE;
 805
 806         return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
 807 }
 808
 809 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
 810 {
 811         unsigned port, size, iopm_len;
 812         u16 val, mask;
 813         u8 start_bit;
 814         u64 gpa;
 815
 816         if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT)))
 817                 return NESTED_EXIT_HOST;
 818
 819         port = svm->vmcb->control.exit_info_1 >> 16;
 820         size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
 821                 SVM_IOIO_SIZE_SHIFT;
 822         gpa  = svm->nested.ctl.iopm_base_pa + (port / 8);
 823         start_bit = port % 8;
 824         iopm_len = (start_bit + size > 8) ? 2 : 1;
 825         mask = (0xf >> (4 - size)) << start_bit;
 826         val = 0;
 827
 828         if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
 829                 return NESTED_EXIT_DONE;
 830
 831         return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
 832 }
 833
 834 static int nested_svm_intercept(struct vcpu_svm *svm)
 835 {
 836         u32 exit_code = svm->vmcb->control.exit_code;
 837         int vmexit = NESTED_EXIT_HOST;
 838
 839         switch (exit_code) {
 840         case SVM_EXIT_MSR:
 841                 vmexit = nested_svm_exit_handled_msr(svm);
 842                 break;
 843         case SVM_EXIT_IOIO:
 844                 vmexit = nested_svm_intercept_ioio(svm);
 845                 break;
 846         case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
 847                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
 848                         vmexit = NESTED_EXIT_DONE;
 849                 break;
 850         }
 851         case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
 852                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
 853                         vmexit = NESTED_EXIT_DONE;
 854                 break;
 855         }
 856         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
 857                 /*
 858                  * Host-intercepted exceptions have been checked already in
 859                  * nested_svm_exit_special.  There is nothing to do here,
 860                  * the vmexit is injected by svm_check_nested_events.
 861                  */
 862                 vmexit = NESTED_EXIT_DONE;
 863                 break;
 864         }
 865         case SVM_EXIT_ERR: {
 866                 vmexit = NESTED_EXIT_DONE;
 867                 break;
 868         }
 869         default: {
 870                 if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
 871                         vmexit = NESTED_EXIT_DONE;
 872         }
 873         }
 874
 875         return vmexit;
 876 }
 877
 878 int nested_svm_exit_handled(struct vcpu_svm *svm)
 879 {
 880         int vmexit;
 881
 882         vmexit = nested_svm_intercept(svm);
 883
 884         if (vmexit == NESTED_EXIT_DONE)
 885                 nested_svm_vmexit(svm);
 886
 887         return vmexit;
 888 }
 889
 890 int nested_svm_check_permissions(struct vcpu_svm *svm)
 891 {
 892         if (!(svm->vcpu.arch.efer & EFER_SVME) ||
 893             !is_paging(&svm->vcpu)) {
 894                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
 895                 return 1;
 896         }
 897
 898         if (svm->vmcb->save.cpl) {
 899                 kvm_inject_gp(&svm->vcpu, 0);
 900                 return 1;
 901         }
 902
 903         return 0;
 904 }
 905
 906 static bool nested_exit_on_exception(struct vcpu_svm *svm)
 907 {
 908         unsigned int nr = svm->vcpu.arch.exception.nr;
 909
 910         return (svm->nested.ctl.intercepts[INTERCEPT_EXCEPTION] & BIT(nr));
 911 }
 912
 913 static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
 914 {
 915         unsigned int nr = svm->vcpu.arch.exception.nr;
 916
 917         svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
 918         svm->vmcb->control.exit_code_hi = 0;
 919
 920         if (svm->vcpu.arch.exception.has_error_code)
 921                 svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
 922
 923         /*
 924          * EXITINFO2 is undefined for all exception intercepts other
 925          * than #PF.
 926          */
 927         if (nr == PF_VECTOR) {
 928                 if (svm->vcpu.arch.exception.nested_apf)
 929                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
 930                 else if (svm->vcpu.arch.exception.has_payload)
 931                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
 932                 else
 933                         svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
 934         } else if (nr == DB_VECTOR) {
 935                 /* See inject_pending_event.  */
 936                 kvm_deliver_exception_payload(&svm->vcpu);
 937                 if (svm->vcpu.arch.dr7 & DR7_GD) {
 938                         svm->vcpu.arch.dr7 &= ~DR7_GD;
 939                         kvm_update_dr7(&svm->vcpu);
 940                 }
 941         } else
 942                 WARN_ON(svm->vcpu.arch.exception.has_payload);
 943
 944         nested_svm_vmexit(svm);
 945 }
 946
 947 static void nested_svm_smi(struct vcpu_svm *svm)
 948 {
 949         svm->vmcb->control.exit_code = SVM_EXIT_SMI;
 950         svm->vmcb->control.exit_info_1 = 0;
 951         svm->vmcb->control.exit_info_2 = 0;
 952
 953         nested_svm_vmexit(svm);
 954 }
 955
 956 static void nested_svm_nmi(struct vcpu_svm *svm)
 957 {
 958         svm->vmcb->control.exit_code = SVM_EXIT_NMI;
 959         svm->vmcb->control.exit_info_1 = 0;
 960         svm->vmcb->control.exit_info_2 = 0;
 961
 962         nested_svm_vmexit(svm);
 963 }
 964
 965 static void nested_svm_intr(struct vcpu_svm *svm)
 966 {
 967         trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
 968
 969         svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
 970         svm->vmcb->control.exit_info_1 = 0;
 971         svm->vmcb->control.exit_info_2 = 0;
 972
 973         nested_svm_vmexit(svm);
 974 }
 975
 976 static inline bool nested_exit_on_init(struct vcpu_svm *svm)
 977 {
 978         return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT);
 979 }
 980
 981 static void nested_svm_init(struct vcpu_svm *svm)
 982 {
 983         svm->vmcb->control.exit_code   = SVM_EXIT_INIT;
 984         svm->vmcb->control.exit_info_1 = 0;
 985         svm->vmcb->control.exit_info_2 = 0;
 986
 987         nested_svm_vmexit(svm);
 988 }
 989
 990
 991 static int svm_check_nested_events(struct kvm_vcpu *vcpu)
 992 {
 993         struct vcpu_svm *svm = to_svm(vcpu);
 994         bool block_nested_events =
 995                 kvm_event_needs_reinjection(vcpu) || svm->nested.nested_run_pending;
 996         struct kvm_lapic *apic = vcpu->arch.apic;
 997
 998         if (lapic_in_kernel(vcpu) &&
 999             test_bit(KVM_APIC_INIT, &apic->pending_events)) {
1000                 if (block_nested_events)
1001                         return -EBUSY;
1002                 if (!nested_exit_on_init(svm))
1003                         return 0;
1004                 nested_svm_init(svm);
1005                 return 0;
1006         }
1007
1008         if (vcpu->arch.exception.pending) {
1009                 if (block_nested_events)
1010                         return -EBUSY;
1011                 if (!nested_exit_on_exception(svm))
1012                         return 0;
1013                 nested_svm_inject_exception_vmexit(svm);
1014                 return 0;
1015         }
1016
1017         if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) {
1018                 if (block_nested_events)
1019                         return -EBUSY;
1020                 if (!nested_exit_on_smi(svm))
1021                         return 0;
1022                 nested_svm_smi(svm);
1023                 return 0;
1024         }
1025
1026         if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) {
1027                 if (block_nested_events)
1028                         return -EBUSY;
1029                 if (!nested_exit_on_nmi(svm))
1030                         return 0;
1031                 nested_svm_nmi(svm);
1032                 return 0;
1033         }
1034
1035         if (kvm_cpu_has_interrupt(vcpu) && !svm_interrupt_blocked(vcpu)) {
1036                 if (block_nested_events)
1037                         return -EBUSY;
1038                 if (!nested_exit_on_intr(svm))
1039                         return 0;
1040                 nested_svm_intr(svm);
1041                 return 0;
1042         }
1043
1044         return 0;
1045 }
1046
1047 int nested_svm_exit_special(struct vcpu_svm *svm)
1048 {
1049         u32 exit_code = svm->vmcb->control.exit_code;
1050
1051         switch (exit_code) {
1052         case SVM_EXIT_INTR:
1053         case SVM_EXIT_NMI:
1054         case SVM_EXIT_NPF:
1055                 return NESTED_EXIT_HOST;
1056         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1057                 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
1058
1059                 if (get_host_vmcb(svm)->control.intercepts[INTERCEPT_EXCEPTION] &
1060                                 excp_bits)
1061                         return NESTED_EXIT_HOST;
1062                 else if (exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR &&
1063                          svm->vcpu.arch.apf.host_apf_flags)
1064                         /* Trap async PF even if not shadowing */
1065                         return NESTED_EXIT_HOST;
1066                 break;
1067         }
1068         default:
1069                 break;
1070         }
1071
1072         return NESTED_EXIT_CONTINUE;
1073 }
1074
1075 static int svm_get_nested_state(struct kvm_vcpu *vcpu,
1076                                 struct kvm_nested_state __user *user_kvm_nested_state,
1077                                 u32 user_data_size)
1078 {
1079         struct vcpu_svm *svm;
1080         struct kvm_nested_state kvm_state = {
1081                 .flags = 0,
1082                 .format = KVM_STATE_NESTED_FORMAT_SVM,
1083                 .size = sizeof(kvm_state),
1084         };
1085         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1086                 &user_kvm_nested_state->data.svm[0];
1087
1088         if (!vcpu)
1089                 return kvm_state.size + KVM_STATE_NESTED_SVM_VMCB_SIZE;
1090
1091         svm = to_svm(vcpu);
1092
1093         if (user_data_size < kvm_state.size)
1094                 goto out;
1095
1096         /* First fill in the header and copy it out.  */
1097         if (is_guest_mode(vcpu)) {
1098                 kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa;
1099                 kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
1100                 kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
1101
1102                 if (svm->nested.nested_run_pending)
1103                         kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
1104         }
1105
1106         if (gif_set(svm))
1107                 kvm_state.flags |= KVM_STATE_NESTED_GIF_SET;
1108
1109         if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
1110                 return -EFAULT;
1111
1112         if (!is_guest_mode(vcpu))
1113                 goto out;
1114
1115         /*
1116          * Copy over the full size of the VMCB rather than just the size
1117          * of the structs.
1118          */
1119         if (clear_user(user_vmcb, KVM_STATE_NESTED_SVM_VMCB_SIZE))
1120                 return -EFAULT;
1121         if (copy_to_user(&user_vmcb->control, &svm->nested.ctl,
1122                          sizeof(user_vmcb->control)))
1123                 return -EFAULT;
1124         if (copy_to_user(&user_vmcb->save, &svm->nested.hsave->save,
1125                          sizeof(user_vmcb->save)))
1126                 return -EFAULT;
1127
1128 out:
1129         return kvm_state.size;
1130 }
1131
1132 static int svm_set_nested_state(struct kvm_vcpu *vcpu,
1133                                 struct kvm_nested_state __user *user_kvm_nested_state,
1134                                 struct kvm_nested_state *kvm_state)
1135 {
1136         struct vcpu_svm *svm = to_svm(vcpu);
1137         struct vmcb *hsave = svm->nested.hsave;
1138         struct vmcb __user *user_vmcb = (struct vmcb __user *)
1139                 &user_kvm_nested_state->data.svm[0];
1140         struct vmcb_control_area *ctl;
1141         struct vmcb_save_area *save;
1142         int ret;
1143         u32 cr0;
1144
1145         BUILD_BUG_ON(sizeof(struct vmcb_control_area) + sizeof(struct vmcb_save_area) >
1146                      KVM_STATE_NESTED_SVM_VMCB_SIZE);
1147
1148         if (kvm_state->format != KVM_STATE_NESTED_FORMAT_SVM)
1149                 return -EINVAL;
1150
1151         if (kvm_state->flags & ~(KVM_STATE_NESTED_GUEST_MODE |
1152                                  KVM_STATE_NESTED_RUN_PENDING |
1153                                  KVM_STATE_NESTED_GIF_SET))
1154                 return -EINVAL;
1155
1156         /*
1157          * If in guest mode, vcpu->arch.efer actually refers to the L2 guest's
1158          * EFER.SVME, but EFER.SVME still has to be 1 for VMRUN to succeed.
1159          */
1160         if (!(vcpu->arch.efer & EFER_SVME)) {
1161                 /* GIF=1 and no guest mode are required if SVME=0.  */
1162                 if (kvm_state->flags != KVM_STATE_NESTED_GIF_SET)
1163                         return -EINVAL;
1164         }
1165
1166         /* SMM temporarily disables SVM, so we cannot be in guest mode.  */
1167         if (is_smm(vcpu) && (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
1168                 return -EINVAL;
1169
1170         if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) {
1171                 svm_leave_nested(svm);
1172                 svm_set_gif(svm, !!(kvm_state->flags & KVM_STATE_NESTED_GIF_SET));
1173                 return 0;
1174         }
1175
1176         if (!page_address_valid(vcpu, kvm_state->hdr.svm.vmcb_pa))
1177                 return -EINVAL;
1178         if (kvm_state->size < sizeof(*kvm_state) + KVM_STATE_NESTED_SVM_VMCB_SIZE)
1179                 return -EINVAL;
1180
1181         ret  = -ENOMEM;
1182         ctl  = kzalloc(sizeof(*ctl),  GFP_KERNEL);
1183         save = kzalloc(sizeof(*save), GFP_KERNEL);
1184         if (!ctl || !save)
1185                 goto out_free;
1186
1187         ret = -EFAULT;
1188         if (copy_from_user(ctl, &user_vmcb->control, sizeof(*ctl)))
1189                 goto out_free;
1190         if (copy_from_user(save, &user_vmcb->save, sizeof(*save)))
1191                 goto out_free;
1192
1193         ret = -EINVAL;
1194         if (!nested_vmcb_check_controls(ctl))
1195                 goto out_free;
1196
1197         /*
1198          * Processor state contains L2 state.  Check that it is
1199          * valid for guest mode (see nested_vmcb_checks).
1200          */
1201         cr0 = kvm_read_cr0(vcpu);
1202         if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
1203                 goto out_free;
1204
1205         /*
1206          * Validate host state saved from before VMRUN (see
1207          * nested_svm_check_permissions).
1208          * TODO: validate reserved bits for all saved state.
1209          */
1210         if (!(save->cr0 & X86_CR0_PG))
1211                 goto out_free;
1212
1213         /*
1214          * All checks done, we can enter guest mode.  L1 control fields
1215          * come from the nested save state.  Guest state is already
1216          * in the registers, the save area of the nested state instead
1217          * contains saved L1 state.
1218          */
1219
1220         svm->nested.nested_run_pending =
1221                 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
1222
1223         copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
1224         hsave->save = *save;
1225
1226         svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
1227         load_nested_vmcb_control(svm, ctl);
1228         nested_prepare_vmcb_control(svm);
1229
1230         kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
1231         ret = 0;
1232 out_free:
1233         kfree(save);
1234         kfree(ctl);
1235
1236         return ret;
1237 }
1238
1239 struct kvm_x86_nested_ops svm_nested_ops = {
1240         .check_events = svm_check_nested_events,
1241         .get_nested_state_pages = svm_get_nested_state_pages,
1242         .get_state = svm_get_nested_state,
1243         .set_state = svm_set_nested_state,
1244 };