arch/arm/kvm/arm.c

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <linux/cpu.h>
  20 #include <linux/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/kvm_host.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/fs.h>
  26 #include <linux/mman.h>
  27 #include <linux/sched.h>
  28 #include <linux/kvm.h>
  29 #include <trace/events/kvm.h>
  30
  31 #define CREATE_TRACE_POINTS
  32 #include "trace.h"
  33
  34 #include <asm/uaccess.h>
  35 #include <asm/ptrace.h>
  36 #include <asm/mman.h>
  37 #include <asm/tlbflush.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/virt.h>
  40 #include <asm/kvm_arm.h>
  41 #include <asm/kvm_asm.h>
  42 #include <asm/kvm_mmu.h>
  43 #include <asm/kvm_emulate.h>
  44 #include <asm/kvm_coproc.h>
  45 #include <asm/kvm_psci.h>
  46
  47 #ifdef REQUIRES_VIRT
  48 __asm__(".arch_extension        virt");
  49 #endif
  50
  51 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
  52 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
  53 static unsigned long hyp_default_vectors;
  54
  55 /* Per-CPU variable containing the currently running vcpu. */
  56 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
  57
  58 /* The VMID used in the VTTBR */
  59 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
  60 static u8 kvm_next_vmid;
  61 static DEFINE_SPINLOCK(kvm_vmid_lock);
  62
  63 static bool vgic_present;
  64
  65 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  66 {
  67         BUG_ON(preemptible());
  68         __get_cpu_var(kvm_arm_running_vcpu) = vcpu;
  69 }
  70
  71 /**
  72  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  73  * Must be called from non-preemptible context
  74  */
  75 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  76 {
  77         BUG_ON(preemptible());
  78         return __get_cpu_var(kvm_arm_running_vcpu);
  79 }
  80
  81 /**
  82  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  83  */
  84 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void)
  85 {
  86         return &kvm_arm_running_vcpu;
  87 }
  88
  89 int kvm_arch_hardware_enable(void *garbage)
  90 {
  91         return 0;
  92 }
  93
  94 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  95 {
  96         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
  97 }
  98
  99 void kvm_arch_hardware_disable(void *garbage)
 100 {
 101 }
 102
 103 int kvm_arch_hardware_setup(void)
 104 {
 105         return 0;
 106 }
 107
 108 void kvm_arch_hardware_unsetup(void)
 109 {
 110 }
 111
 112 void kvm_arch_check_processor_compat(void *rtn)
 113 {
 114         *(int *)rtn = 0;
 115 }
 116
 117 void kvm_arch_sync_events(struct kvm *kvm)
 118 {
 119 }
 120
 121 /**
 122  * kvm_arch_init_vm - initializes a VM data structure
 123  * @kvm:        pointer to the KVM struct
 124  */
 125 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 126 {
 127         int ret = 0;
 128
 129         if (type)
 130                 return -EINVAL;
 131
 132         ret = kvm_alloc_stage2_pgd(kvm);
 133         if (ret)
 134                 goto out_fail_alloc;
 135
 136         ret = create_hyp_mappings(kvm, kvm + 1);
 137         if (ret)
 138                 goto out_free_stage2_pgd;
 139
 140         /* Mark the initial VMID generation invalid */
 141         kvm->arch.vmid_gen = 0;
 142
 143         return ret;
 144 out_free_stage2_pgd:
 145         kvm_free_stage2_pgd(kvm);
 146 out_fail_alloc:
 147         return ret;
 148 }
 149
 150 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 151 {
 152         return VM_FAULT_SIGBUS;
 153 }
 154
 155 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 156                            struct kvm_memory_slot *dont)
 157 {
 158 }
 159
 160 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
 161 {
 162         return 0;
 163 }
 164
 165 /**
 166  * kvm_arch_destroy_vm - destroy the VM data structure
 167  * @kvm:        pointer to the KVM struct
 168  */
 169 void kvm_arch_destroy_vm(struct kvm *kvm)
 170 {
 171         int i;
 172
 173         kvm_free_stage2_pgd(kvm);
 174
 175         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 176                 if (kvm->vcpus[i]) {
 177                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 178                         kvm->vcpus[i] = NULL;
 179                 }
 180         }
 181 }
 182
 183 int kvm_dev_ioctl_check_extension(long ext)
 184 {
 185         int r;
 186         switch (ext) {
 187         case KVM_CAP_IRQCHIP:
 188                 r = vgic_present;
 189                 break;
 190         case KVM_CAP_USER_MEMORY:
 191         case KVM_CAP_SYNC_MMU:
 192         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 193         case KVM_CAP_ONE_REG:
 194         case KVM_CAP_ARM_PSCI:
 195                 r = 1;
 196                 break;
 197         case KVM_CAP_COALESCED_MMIO:
 198                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 199                 break;
 200         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 201                 r = 1;
 202                 break;
 203         case KVM_CAP_NR_VCPUS:
 204                 r = num_online_cpus();
 205                 break;
 206         case KVM_CAP_MAX_VCPUS:
 207                 r = KVM_MAX_VCPUS;
 208                 break;
 209         default:
 210                 r = kvm_arch_dev_ioctl_check_extension(ext);
 211                 break;
 212         }
 213         return r;
 214 }
 215
 216 long kvm_arch_dev_ioctl(struct file *filp,
 217                         unsigned int ioctl, unsigned long arg)
 218 {
 219         return -EINVAL;
 220 }
 221
 222 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 223                                    struct kvm_memory_slot *memslot,
 224                                    struct kvm_userspace_memory_region *mem,
 225                                    enum kvm_mr_change change)
 226 {
 227         return 0;
 228 }
 229
 230 void kvm_arch_commit_memory_region(struct kvm *kvm,
 231                                    struct kvm_userspace_memory_region *mem,
 232                                    const struct kvm_memory_slot *old,
 233                                    enum kvm_mr_change change)
 234 {
 235 }
 236
 237 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 238 {
 239 }
 240
 241 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 242                                    struct kvm_memory_slot *slot)
 243 {
 244 }
 245
 246 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 247 {
 248         int err;
 249         struct kvm_vcpu *vcpu;
 250
 251         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 252         if (!vcpu) {
 253                 err = -ENOMEM;
 254                 goto out;
 255         }
 256
 257         err = kvm_vcpu_init(vcpu, kvm, id);
 258         if (err)
 259                 goto free_vcpu;
 260
 261         err = create_hyp_mappings(vcpu, vcpu + 1);
 262         if (err)
 263                 goto vcpu_uninit;
 264
 265         return vcpu;
 266 vcpu_uninit:
 267         kvm_vcpu_uninit(vcpu);
 268 free_vcpu:
 269         kmem_cache_free(kvm_vcpu_cache, vcpu);
 270 out:
 271         return ERR_PTR(err);
 272 }
 273
 274 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 275 {
 276         return 0;
 277 }
 278
 279 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 280 {
 281         kvm_mmu_free_memory_caches(vcpu);
 282         kvm_timer_vcpu_terminate(vcpu);
 283         kmem_cache_free(kvm_vcpu_cache, vcpu);
 284 }
 285
 286 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 287 {
 288         kvm_arch_vcpu_free(vcpu);
 289 }
 290
 291 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 292 {
 293         return 0;
 294 }
 295
 296 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 297 {
 298         int ret;
 299
 300         /* Force users to call KVM_ARM_VCPU_INIT */
 301         vcpu->arch.target = -1;
 302
 303         /* Set up VGIC */
 304         ret = kvm_vgic_vcpu_init(vcpu);
 305         if (ret)
 306                 return ret;
 307
 308         /* Set up the timer */
 309         kvm_timer_vcpu_init(vcpu);
 310
 311         return 0;
 312 }
 313
 314 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 315 {
 316 }
 317
 318 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 319 {
 320         vcpu->cpu = cpu;
 321         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 322
 323         /*
 324          * Check whether this vcpu requires the cache to be flushed on
 325          * this physical CPU. This is a consequence of doing dcache
 326          * operations by set/way on this vcpu. We do it here to be in
 327          * a non-preemptible section.
 328          */
 329         if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
 330                 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
 331
 332         kvm_arm_set_running_vcpu(vcpu);
 333 }
 334
 335 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 336 {
 337         kvm_arm_set_running_vcpu(NULL);
 338 }
 339
 340 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 341                                         struct kvm_guest_debug *dbg)
 342 {
 343         return -EINVAL;
 344 }
 345
 346
 347 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 348                                     struct kvm_mp_state *mp_state)
 349 {
 350         return -EINVAL;
 351 }
 352
 353 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 354                                     struct kvm_mp_state *mp_state)
 355 {
 356         return -EINVAL;
 357 }
 358
 359 /**
 360  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 361  * @v:          The VCPU pointer
 362  *
 363  * If the guest CPU is not waiting for interrupts or an interrupt line is
 364  * asserted, the CPU is by definition runnable.
 365  */
 366 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 367 {
 368         return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
 369 }
 370
 371 /* Just ensure a guest exit from a particular CPU */
 372 static void exit_vm_noop(void *info)
 373 {
 374 }
 375
 376 void force_vm_exit(const cpumask_t *mask)
 377 {
 378         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 379 }
 380
 381 /**
 382  * need_new_vmid_gen - check that the VMID is still valid
 383  * @kvm: The VM's VMID to checkt
 384  *
 385  * return true if there is a new generation of VMIDs being used
 386  *
 387  * The hardware supports only 256 values with the value zero reserved for the
 388  * host, so we check if an assigned value belongs to a previous generation,
 389  * which which requires us to assign a new value. If we're the first to use a
 390  * VMID for the new generation, we must flush necessary caches and TLBs on all
 391  * CPUs.
 392  */
 393 static bool need_new_vmid_gen(struct kvm *kvm)
 394 {
 395         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 396 }
 397
 398 /**
 399  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 400  * @kvm The guest that we are about to run
 401  *
 402  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 403  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 404  * caches and TLBs.
 405  */
 406 static void update_vttbr(struct kvm *kvm)
 407 {
 408         phys_addr_t pgd_phys;
 409         u64 vmid;
 410
 411         if (!need_new_vmid_gen(kvm))
 412                 return;
 413
 414         spin_lock(&kvm_vmid_lock);
 415
 416         /*
 417          * We need to re-check the vmid_gen here to ensure that if another vcpu
 418          * already allocated a valid vmid for this vm, then this vcpu should
 419          * use the same vmid.
 420          */
 421         if (!need_new_vmid_gen(kvm)) {
 422                 spin_unlock(&kvm_vmid_lock);
 423                 return;
 424         }
 425
 426         /* First user of a new VMID generation? */
 427         if (unlikely(kvm_next_vmid == 0)) {
 428                 atomic64_inc(&kvm_vmid_gen);
 429                 kvm_next_vmid = 1;
 430
 431                 /*
 432                  * On SMP we know no other CPUs can use this CPU's or each
 433                  * other's VMID after force_vm_exit returns since the
 434                  * kvm_vmid_lock blocks them from reentry to the guest.
 435                  */
 436                 force_vm_exit(cpu_all_mask);
 437                 /*
 438                  * Now broadcast TLB + ICACHE invalidation over the inner
 439                  * shareable domain to make sure all data structures are
 440                  * clean.
 441                  */
 442                 kvm_call_hyp(__kvm_flush_vm_context);
 443         }
 444
 445         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 446         kvm->arch.vmid = kvm_next_vmid;
 447         kvm_next_vmid++;
 448
 449         /* update vttbr to be used with the new vmid */
 450         pgd_phys = virt_to_phys(kvm->arch.pgd);
 451         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
 452         kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
 453         kvm->arch.vttbr |= vmid;
 454
 455         spin_unlock(&kvm_vmid_lock);
 456 }
 457
 458 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 459 {
 460         if (likely(vcpu->arch.has_run_once))
 461                 return 0;
 462
 463         vcpu->arch.has_run_once = true;
 464
 465         /*
 466          * Initialize the VGIC before running a vcpu the first time on
 467          * this VM.
 468          */
 469         if (irqchip_in_kernel(vcpu->kvm) &&
 470             unlikely(!vgic_initialized(vcpu->kvm))) {
 471                 int ret = kvm_vgic_init(vcpu->kvm);
 472                 if (ret)
 473                         return ret;
 474         }
 475
 476         /*
 477          * Handle the "start in power-off" case by calling into the
 478          * PSCI code.
 479          */
 480         if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) {
 481                 *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF;
 482                 kvm_psci_call(vcpu);
 483         }
 484
 485         return 0;
 486 }
 487
 488 static void vcpu_pause(struct kvm_vcpu *vcpu)
 489 {
 490         wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
 491
 492         wait_event_interruptible(*wq, !vcpu->arch.pause);
 493 }
 494
 495 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 496 {
 497         return vcpu->arch.target >= 0;
 498 }
 499
 500 /**
 501  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 502  * @vcpu:       The VCPU pointer
 503  * @run:        The kvm_run structure pointer used for userspace state exchange
 504  *
 505  * This function is called through the VCPU_RUN ioctl called from user space. It
 506  * will execute VM code in a loop until the time slice for the process is used
 507  * or some emulation is needed from user space in which case the function will
 508  * return with return value 0 and with the kvm_run structure filled in with the
 509  * required data for the requested emulation.
 510  */
 511 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 512 {
 513         int ret;
 514         sigset_t sigsaved;
 515
 516         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 517                 return -ENOEXEC;
 518
 519         ret = kvm_vcpu_first_run_init(vcpu);
 520         if (ret)
 521                 return ret;
 522
 523         if (run->exit_reason == KVM_EXIT_MMIO) {
 524                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 525                 if (ret)
 526                         return ret;
 527         }
 528
 529         if (vcpu->sigset_active)
 530                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 531
 532         ret = 1;
 533         run->exit_reason = KVM_EXIT_UNKNOWN;
 534         while (ret > 0) {
 535                 /*
 536                  * Check conditions before entering the guest
 537                  */
 538                 cond_resched();
 539
 540                 update_vttbr(vcpu->kvm);
 541
 542                 if (vcpu->arch.pause)
 543                         vcpu_pause(vcpu);
 544
 545                 kvm_vgic_flush_hwstate(vcpu);
 546                 kvm_timer_flush_hwstate(vcpu);
 547
 548                 local_irq_disable();
 549
 550                 /*
 551                  * Re-check atomic conditions
 552                  */
 553                 if (signal_pending(current)) {
 554                         ret = -EINTR;
 555                         run->exit_reason = KVM_EXIT_INTR;
 556                 }
 557
 558                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
 559                         local_irq_enable();
 560                         kvm_timer_sync_hwstate(vcpu);
 561                         kvm_vgic_sync_hwstate(vcpu);
 562                         continue;
 563                 }
 564
 565                 /**************************************************************
 566                  * Enter the guest
 567                  */
 568                 trace_kvm_entry(*vcpu_pc(vcpu));
 569                 kvm_guest_enter();
 570                 vcpu->mode = IN_GUEST_MODE;
 571
 572                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 573
 574                 vcpu->mode = OUTSIDE_GUEST_MODE;
 575                 vcpu->arch.last_pcpu = smp_processor_id();
 576                 kvm_guest_exit();
 577                 trace_kvm_exit(*vcpu_pc(vcpu));
 578                 /*
 579                  * We may have taken a host interrupt in HYP mode (ie
 580                  * while executing the guest). This interrupt is still
 581                  * pending, as we haven't serviced it yet!
 582                  *
 583                  * We're now back in SVC mode, with interrupts
 584                  * disabled.  Enabling the interrupts now will have
 585                  * the effect of taking the interrupt again, in SVC
 586                  * mode this time.
 587                  */
 588                 local_irq_enable();
 589
 590                 /*
 591                  * Back from guest
 592                  *************************************************************/
 593
 594                 kvm_timer_sync_hwstate(vcpu);
 595                 kvm_vgic_sync_hwstate(vcpu);
 596
 597                 ret = handle_exit(vcpu, run, ret);
 598         }
 599
 600         if (vcpu->sigset_active)
 601                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 602         return ret;
 603 }
 604
 605 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 606 {
 607         int bit_index;
 608         bool set;
 609         unsigned long *ptr;
 610
 611         if (number == KVM_ARM_IRQ_CPU_IRQ)
 612                 bit_index = __ffs(HCR_VI);
 613         else /* KVM_ARM_IRQ_CPU_FIQ */
 614                 bit_index = __ffs(HCR_VF);
 615
 616         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 617         if (level)
 618                 set = test_and_set_bit(bit_index, ptr);
 619         else
 620                 set = test_and_clear_bit(bit_index, ptr);
 621
 622         /*
 623          * If we didn't change anything, no need to wake up or kick other CPUs
 624          */
 625         if (set == level)
 626                 return 0;
 627
 628         /*
 629          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 630          * trigger a world-switch round on the running physical CPU to set the
 631          * virtual IRQ/FIQ fields in the HCR appropriately.
 632          */
 633         kvm_vcpu_kick(vcpu);
 634
 635         return 0;
 636 }
 637
 638 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 639                           bool line_status)
 640 {
 641         u32 irq = irq_level->irq;
 642         unsigned int irq_type, vcpu_idx, irq_num;
 643         int nrcpus = atomic_read(&kvm->online_vcpus);
 644         struct kvm_vcpu *vcpu = NULL;
 645         bool level = irq_level->level;
 646
 647         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 648         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 649         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 650
 651         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 652
 653         switch (irq_type) {
 654         case KVM_ARM_IRQ_TYPE_CPU:
 655                 if (irqchip_in_kernel(kvm))
 656                         return -ENXIO;
 657
 658                 if (vcpu_idx >= nrcpus)
 659                         return -EINVAL;
 660
 661                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 662                 if (!vcpu)
 663                         return -EINVAL;
 664
 665                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 666                         return -EINVAL;
 667
 668                 return vcpu_interrupt_line(vcpu, irq_num, level);
 669         case KVM_ARM_IRQ_TYPE_PPI:
 670                 if (!irqchip_in_kernel(kvm))
 671                         return -ENXIO;
 672
 673                 if (vcpu_idx >= nrcpus)
 674                         return -EINVAL;
 675
 676                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 677                 if (!vcpu)
 678                         return -EINVAL;
 679
 680                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 681                         return -EINVAL;
 682
 683                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 684         case KVM_ARM_IRQ_TYPE_SPI:
 685                 if (!irqchip_in_kernel(kvm))
 686                         return -ENXIO;
 687
 688                 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
 689                     irq_num > KVM_ARM_IRQ_GIC_MAX)
 690                         return -EINVAL;
 691
 692                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 693         }
 694
 695         return -EINVAL;
 696 }
 697
 698 long kvm_arch_vcpu_ioctl(struct file *filp,
 699                          unsigned int ioctl, unsigned long arg)
 700 {
 701         struct kvm_vcpu *vcpu = filp->private_data;
 702         void __user *argp = (void __user *)arg;
 703
 704         switch (ioctl) {
 705         case KVM_ARM_VCPU_INIT: {
 706                 struct kvm_vcpu_init init;
 707
 708                 if (copy_from_user(&init, argp, sizeof(init)))
 709                         return -EFAULT;
 710
 711                 return kvm_vcpu_set_target(vcpu, &init);
 712
 713         }
 714         case KVM_SET_ONE_REG:
 715         case KVM_GET_ONE_REG: {
 716                 struct kvm_one_reg reg;
 717
 718                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 719                         return -ENOEXEC;
 720
 721                 if (copy_from_user(&reg, argp, sizeof(reg)))
 722                         return -EFAULT;
 723                 if (ioctl == KVM_SET_ONE_REG)
 724                         return kvm_arm_set_reg(vcpu, &reg);
 725                 else
 726                         return kvm_arm_get_reg(vcpu, &reg);
 727         }
 728         case KVM_GET_REG_LIST: {
 729                 struct kvm_reg_list __user *user_list = argp;
 730                 struct kvm_reg_list reg_list;
 731                 unsigned n;
 732
 733                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 734                         return -ENOEXEC;
 735
 736                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 737                         return -EFAULT;
 738                 n = reg_list.n;
 739                 reg_list.n = kvm_arm_num_regs(vcpu);
 740                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 741                         return -EFAULT;
 742                 if (n < reg_list.n)
 743                         return -E2BIG;
 744                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 745         }
 746         default:
 747                 return -EINVAL;
 748         }
 749 }
 750
 751 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 752 {
 753         return -EINVAL;
 754 }
 755
 756 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 757                                         struct kvm_arm_device_addr *dev_addr)
 758 {
 759         unsigned long dev_id, type;
 760
 761         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 762                 KVM_ARM_DEVICE_ID_SHIFT;
 763         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 764                 KVM_ARM_DEVICE_TYPE_SHIFT;
 765
 766         switch (dev_id) {
 767         case KVM_ARM_DEVICE_VGIC_V2:
 768                 if (!vgic_present)
 769                         return -ENXIO;
 770                 return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
 771         default:
 772                 return -ENODEV;
 773         }
 774 }
 775
 776 long kvm_arch_vm_ioctl(struct file *filp,
 777                        unsigned int ioctl, unsigned long arg)
 778 {
 779         struct kvm *kvm = filp->private_data;
 780         void __user *argp = (void __user *)arg;
 781
 782         switch (ioctl) {
 783         case KVM_CREATE_IRQCHIP: {
 784                 if (vgic_present)
 785                         return kvm_vgic_create(kvm);
 786                 else
 787                         return -ENXIO;
 788         }
 789         case KVM_ARM_SET_DEVICE_ADDR: {
 790                 struct kvm_arm_device_addr dev_addr;
 791
 792                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
 793                         return -EFAULT;
 794                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
 795         }
 796         default:
 797                 return -EINVAL;
 798         }
 799 }
 800
 801 static void cpu_init_hyp_mode(void *dummy)
 802 {
 803         phys_addr_t boot_pgd_ptr;
 804         phys_addr_t pgd_ptr;
 805         unsigned long hyp_stack_ptr;
 806         unsigned long stack_page;
 807         unsigned long vector_ptr;
 808
 809         /* Switch from the HYP stub to our own HYP init vector */
 810         __hyp_set_vectors(kvm_get_idmap_vector());
 811
 812         boot_pgd_ptr = kvm_mmu_get_boot_httbr();
 813         pgd_ptr = kvm_mmu_get_httbr();
 814         stack_page = __get_cpu_var(kvm_arm_hyp_stack_page);
 815         hyp_stack_ptr = stack_page + PAGE_SIZE;
 816         vector_ptr = (unsigned long)__kvm_hyp_vector;
 817
 818         __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
 819 }
 820
 821 static int hyp_init_cpu_notify(struct notifier_block *self,
 822                                unsigned long action, void *cpu)
 823 {
 824         switch (action) {
 825         case CPU_STARTING:
 826         case CPU_STARTING_FROZEN:
 827                 cpu_init_hyp_mode(NULL);
 828                 break;
 829         }
 830
 831         return NOTIFY_OK;
 832 }
 833
 834 static struct notifier_block hyp_init_cpu_nb = {
 835         .notifier_call = hyp_init_cpu_notify,
 836 };
 837
 838 /**
 839  * Inits Hyp-mode on all online CPUs
 840  */
 841 static int init_hyp_mode(void)
 842 {
 843         int cpu;
 844         int err = 0;
 845
 846         /*
 847          * Allocate Hyp PGD and setup Hyp identity mapping
 848          */
 849         err = kvm_mmu_init();
 850         if (err)
 851                 goto out_err;
 852
 853         /*
 854          * It is probably enough to obtain the default on one
 855          * CPU. It's unlikely to be different on the others.
 856          */
 857         hyp_default_vectors = __hyp_get_vectors();
 858
 859         /*
 860          * Allocate stack pages for Hypervisor-mode
 861          */
 862         for_each_possible_cpu(cpu) {
 863                 unsigned long stack_page;
 864
 865                 stack_page = __get_free_page(GFP_KERNEL);
 866                 if (!stack_page) {
 867                         err = -ENOMEM;
 868                         goto out_free_stack_pages;
 869                 }
 870
 871                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
 872         }
 873
 874         /*
 875          * Map the Hyp-code called directly from the host
 876          */
 877         err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
 878         if (err) {
 879                 kvm_err("Cannot map world-switch code\n");
 880                 goto out_free_mappings;
 881         }
 882
 883         /*
 884          * Map the Hyp stack pages
 885          */
 886         for_each_possible_cpu(cpu) {
 887                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
 888                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
 889
 890                 if (err) {
 891                         kvm_err("Cannot map hyp stack\n");
 892                         goto out_free_mappings;
 893                 }
 894         }
 895
 896         /*
 897          * Map the host CPU structures
 898          */
 899         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
 900         if (!kvm_host_cpu_state) {
 901                 err = -ENOMEM;
 902                 kvm_err("Cannot allocate host CPU state\n");
 903                 goto out_free_mappings;
 904         }
 905
 906         for_each_possible_cpu(cpu) {
 907                 kvm_cpu_context_t *cpu_ctxt;
 908
 909                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
 910                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
 911
 912                 if (err) {
 913                         kvm_err("Cannot map host CPU state: %d\n", err);
 914                         goto out_free_context;
 915                 }
 916         }
 917
 918         /*
 919          * Execute the init code on each CPU.
 920          */
 921         on_each_cpu(cpu_init_hyp_mode, NULL, 1);
 922
 923         /*
 924          * Init HYP view of VGIC
 925          */
 926         err = kvm_vgic_hyp_init();
 927         if (err)
 928                 goto out_free_context;
 929
 930 #ifdef CONFIG_KVM_ARM_VGIC
 931                 vgic_present = true;
 932 #endif
 933
 934         /*
 935          * Init HYP architected timer support
 936          */
 937         err = kvm_timer_hyp_init();
 938         if (err)
 939                 goto out_free_mappings;
 940
 941 #ifndef CONFIG_HOTPLUG_CPU
 942         free_boot_hyp_pgd();
 943 #endif
 944
 945         kvm_perf_init();
 946
 947         kvm_info("Hyp mode initialized successfully\n");
 948
 949         return 0;
 950 out_free_context:
 951         free_percpu(kvm_host_cpu_state);
 952 out_free_mappings:
 953         free_hyp_pgds();
 954 out_free_stack_pages:
 955         for_each_possible_cpu(cpu)
 956                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
 957 out_err:
 958         kvm_err("error initializing Hyp mode: %d\n", err);
 959         return err;
 960 }
 961
 962 static void check_kvm_target_cpu(void *ret)
 963 {
 964         *(int *)ret = kvm_target_cpu();
 965 }
 966
 967 /**
 968  * Initialize Hyp-mode and memory mappings on all CPUs.
 969  */
 970 int kvm_arch_init(void *opaque)
 971 {
 972         int err;
 973         int ret, cpu;
 974
 975         if (!is_hyp_mode_available()) {
 976                 kvm_err("HYP mode not available\n");
 977                 return -ENODEV;
 978         }
 979
 980         for_each_online_cpu(cpu) {
 981                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
 982                 if (ret < 0) {
 983                         kvm_err("Error, CPU %d not supported!\n", cpu);
 984                         return -ENODEV;
 985                 }
 986         }
 987
 988         err = init_hyp_mode();
 989         if (err)
 990                 goto out_err;
 991
 992         err = register_cpu_notifier(&hyp_init_cpu_nb);
 993         if (err) {
 994                 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
 995                 goto out_err;
 996         }
 997
 998         kvm_coproc_table_init();
 999         return 0;
1000 out_err:
1001         return err;
1002 }
1003
1004 /* NOP: Compiling as a module not supported */
1005 void kvm_arch_exit(void)
1006 {
1007         kvm_perf_teardown();
1008 }
1009
1010 static int arm_init(void)
1011 {
1012         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1013         return rc;
1014 }
1015
1016 module_init(arm_init);