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_pm.h>
  20 #include <linux/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/kvm_host.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <linux/mman.h>
  28 #include <linux/sched.h>
  29 #include <linux/kvm.h>
  30 #include <trace/events/kvm.h>
  31 #include <kvm/arm_pmu.h>
  32
  33 #define CREATE_TRACE_POINTS
  34 #include "trace.h"
  35
  36 #include <asm/uaccess.h>
  37 #include <asm/ptrace.h>
  38 #include <asm/mman.h>
  39 #include <asm/tlbflush.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/virt.h>
  42 #include <asm/kvm_arm.h>
  43 #include <asm/kvm_asm.h>
  44 #include <asm/kvm_mmu.h>
  45 #include <asm/kvm_emulate.h>
  46 #include <asm/kvm_coproc.h>
  47 #include <asm/kvm_psci.h>
  48 #include <asm/sections.h>
  49
  50 #ifdef REQUIRES_VIRT
  51 __asm__(".arch_extension        virt");
  52 #endif
  53
  54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
  55 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
  56 static unsigned long hyp_default_vectors;
  57
  58 /* Per-CPU variable containing the currently running vcpu. */
  59 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
  60
  61 /* The VMID used in the VTTBR */
  62 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
  63 static u32 kvm_next_vmid;
  64 static unsigned int kvm_vmid_bits __read_mostly;
  65 static DEFINE_SPINLOCK(kvm_vmid_lock);
  66
  67 static bool vgic_present;
  68
  69 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
  70
  71 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  72 {
  73         BUG_ON(preemptible());
  74         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  75 }
  76
  77 /**
  78  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  79  * Must be called from non-preemptible context
  80  */
  81 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  82 {
  83         BUG_ON(preemptible());
  84         return __this_cpu_read(kvm_arm_running_vcpu);
  85 }
  86
  87 /**
  88  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  89  */
  90 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
  91 {
  92         return &kvm_arm_running_vcpu;
  93 }
  94
  95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  96 {
  97         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
  98 }
  99
 100 int kvm_arch_hardware_setup(void)
 101 {
 102         return 0;
 103 }
 104
 105 void kvm_arch_check_processor_compat(void *rtn)
 106 {
 107         *(int *)rtn = 0;
 108 }
 109
 110
 111 /**
 112  * kvm_arch_init_vm - initializes a VM data structure
 113  * @kvm:        pointer to the KVM struct
 114  */
 115 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 116 {
 117         int ret = 0;
 118
 119         if (type)
 120                 return -EINVAL;
 121
 122         ret = kvm_alloc_stage2_pgd(kvm);
 123         if (ret)
 124                 goto out_fail_alloc;
 125
 126         ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
 127         if (ret)
 128                 goto out_free_stage2_pgd;
 129
 130         kvm_vgic_early_init(kvm);
 131         kvm_timer_init(kvm);
 132
 133         /* Mark the initial VMID generation invalid */
 134         kvm->arch.vmid_gen = 0;
 135
 136         /* The maximum number of VCPUs is limited by the host's GIC model */
 137         kvm->arch.max_vcpus = vgic_present ?
 138                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 139
 140         return ret;
 141 out_free_stage2_pgd:
 142         kvm_free_stage2_pgd(kvm);
 143 out_fail_alloc:
 144         return ret;
 145 }
 146
 147 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 148 {
 149         return VM_FAULT_SIGBUS;
 150 }
 151
 152
 153 /**
 154  * kvm_arch_destroy_vm - destroy the VM data structure
 155  * @kvm:        pointer to the KVM struct
 156  */
 157 void kvm_arch_destroy_vm(struct kvm *kvm)
 158 {
 159         int i;
 160
 161         kvm_free_stage2_pgd(kvm);
 162
 163         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 164                 if (kvm->vcpus[i]) {
 165                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 166                         kvm->vcpus[i] = NULL;
 167                 }
 168         }
 169
 170         kvm_vgic_destroy(kvm);
 171 }
 172
 173 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 174 {
 175         int r;
 176         switch (ext) {
 177         case KVM_CAP_IRQCHIP:
 178                 r = vgic_present;
 179                 break;
 180         case KVM_CAP_IOEVENTFD:
 181         case KVM_CAP_DEVICE_CTRL:
 182         case KVM_CAP_USER_MEMORY:
 183         case KVM_CAP_SYNC_MMU:
 184         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 185         case KVM_CAP_ONE_REG:
 186         case KVM_CAP_ARM_PSCI:
 187         case KVM_CAP_ARM_PSCI_0_2:
 188         case KVM_CAP_READONLY_MEM:
 189         case KVM_CAP_MP_STATE:
 190                 r = 1;
 191                 break;
 192         case KVM_CAP_COALESCED_MMIO:
 193                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 194                 break;
 195         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 196                 r = 1;
 197                 break;
 198         case KVM_CAP_NR_VCPUS:
 199                 r = num_online_cpus();
 200                 break;
 201         case KVM_CAP_MAX_VCPUS:
 202                 r = KVM_MAX_VCPUS;
 203                 break;
 204         default:
 205                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
 206                 break;
 207         }
 208         return r;
 209 }
 210
 211 long kvm_arch_dev_ioctl(struct file *filp,
 212                         unsigned int ioctl, unsigned long arg)
 213 {
 214         return -EINVAL;
 215 }
 216
 217
 218 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 219 {
 220         int err;
 221         struct kvm_vcpu *vcpu;
 222
 223         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 224                 err = -EBUSY;
 225                 goto out;
 226         }
 227
 228         if (id >= kvm->arch.max_vcpus) {
 229                 err = -EINVAL;
 230                 goto out;
 231         }
 232
 233         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 234         if (!vcpu) {
 235                 err = -ENOMEM;
 236                 goto out;
 237         }
 238
 239         err = kvm_vcpu_init(vcpu, kvm, id);
 240         if (err)
 241                 goto free_vcpu;
 242
 243         err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 244         if (err)
 245                 goto vcpu_uninit;
 246
 247         return vcpu;
 248 vcpu_uninit:
 249         kvm_vcpu_uninit(vcpu);
 250 free_vcpu:
 251         kmem_cache_free(kvm_vcpu_cache, vcpu);
 252 out:
 253         return ERR_PTR(err);
 254 }
 255
 256 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 257 {
 258         kvm_vgic_vcpu_early_init(vcpu);
 259 }
 260
 261 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 262 {
 263         kvm_mmu_free_memory_caches(vcpu);
 264         kvm_timer_vcpu_terminate(vcpu);
 265         kvm_vgic_vcpu_destroy(vcpu);
 266         kvm_pmu_vcpu_destroy(vcpu);
 267         kvm_vcpu_uninit(vcpu);
 268         kmem_cache_free(kvm_vcpu_cache, vcpu);
 269 }
 270
 271 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 272 {
 273         kvm_arch_vcpu_free(vcpu);
 274 }
 275
 276 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 277 {
 278         return kvm_timer_should_fire(vcpu);
 279 }
 280
 281 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 282 {
 283         kvm_timer_schedule(vcpu);
 284 }
 285
 286 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 287 {
 288         kvm_timer_unschedule(vcpu);
 289 }
 290
 291 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 292 {
 293         /* Force users to call KVM_ARM_VCPU_INIT */
 294         vcpu->arch.target = -1;
 295         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 296
 297         /* Set up the timer */
 298         kvm_timer_vcpu_init(vcpu);
 299
 300         kvm_arm_reset_debug_ptr(vcpu);
 301
 302         return 0;
 303 }
 304
 305 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 306 {
 307         vcpu->cpu = cpu;
 308         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 309
 310         kvm_arm_set_running_vcpu(vcpu);
 311 }
 312
 313 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 314 {
 315         /*
 316          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 317          * if the vcpu is no longer assigned to a cpu.  This is used for the
 318          * optimized make_all_cpus_request path.
 319          */
 320         vcpu->cpu = -1;
 321
 322         kvm_arm_set_running_vcpu(NULL);
 323         kvm_timer_vcpu_put(vcpu);
 324 }
 325
 326 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 327                                     struct kvm_mp_state *mp_state)
 328 {
 329         if (vcpu->arch.power_off)
 330                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 331         else
 332                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 333
 334         return 0;
 335 }
 336
 337 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 338                                     struct kvm_mp_state *mp_state)
 339 {
 340         switch (mp_state->mp_state) {
 341         case KVM_MP_STATE_RUNNABLE:
 342                 vcpu->arch.power_off = false;
 343                 break;
 344         case KVM_MP_STATE_STOPPED:
 345                 vcpu->arch.power_off = true;
 346                 break;
 347         default:
 348                 return -EINVAL;
 349         }
 350
 351         return 0;
 352 }
 353
 354 /**
 355  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 356  * @v:          The VCPU pointer
 357  *
 358  * If the guest CPU is not waiting for interrupts or an interrupt line is
 359  * asserted, the CPU is by definition runnable.
 360  */
 361 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 362 {
 363         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 364                 && !v->arch.power_off && !v->arch.pause);
 365 }
 366
 367 /* Just ensure a guest exit from a particular CPU */
 368 static void exit_vm_noop(void *info)
 369 {
 370 }
 371
 372 void force_vm_exit(const cpumask_t *mask)
 373 {
 374         preempt_disable();
 375         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 376         preempt_enable();
 377 }
 378
 379 /**
 380  * need_new_vmid_gen - check that the VMID is still valid
 381  * @kvm: The VM's VMID to check
 382  *
 383  * return true if there is a new generation of VMIDs being used
 384  *
 385  * The hardware supports only 256 values with the value zero reserved for the
 386  * host, so we check if an assigned value belongs to a previous generation,
 387  * which which requires us to assign a new value. If we're the first to use a
 388  * VMID for the new generation, we must flush necessary caches and TLBs on all
 389  * CPUs.
 390  */
 391 static bool need_new_vmid_gen(struct kvm *kvm)
 392 {
 393         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 394 }
 395
 396 /**
 397  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 398  * @kvm The guest that we are about to run
 399  *
 400  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 401  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 402  * caches and TLBs.
 403  */
 404 static void update_vttbr(struct kvm *kvm)
 405 {
 406         phys_addr_t pgd_phys;
 407         u64 vmid;
 408
 409         if (!need_new_vmid_gen(kvm))
 410                 return;
 411
 412         spin_lock(&kvm_vmid_lock);
 413
 414         /*
 415          * We need to re-check the vmid_gen here to ensure that if another vcpu
 416          * already allocated a valid vmid for this vm, then this vcpu should
 417          * use the same vmid.
 418          */
 419         if (!need_new_vmid_gen(kvm)) {
 420                 spin_unlock(&kvm_vmid_lock);
 421                 return;
 422         }
 423
 424         /* First user of a new VMID generation? */
 425         if (unlikely(kvm_next_vmid == 0)) {
 426                 atomic64_inc(&kvm_vmid_gen);
 427                 kvm_next_vmid = 1;
 428
 429                 /*
 430                  * On SMP we know no other CPUs can use this CPU's or each
 431                  * other's VMID after force_vm_exit returns since the
 432                  * kvm_vmid_lock blocks them from reentry to the guest.
 433                  */
 434                 force_vm_exit(cpu_all_mask);
 435                 /*
 436                  * Now broadcast TLB + ICACHE invalidation over the inner
 437                  * shareable domain to make sure all data structures are
 438                  * clean.
 439                  */
 440                 kvm_call_hyp(__kvm_flush_vm_context);
 441         }
 442
 443         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 444         kvm->arch.vmid = kvm_next_vmid;
 445         kvm_next_vmid++;
 446         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 447
 448         /* update vttbr to be used with the new vmid */
 449         pgd_phys = virt_to_phys(kvm->arch.pgd);
 450         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 451         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 452         kvm->arch.vttbr = pgd_phys | vmid;
 453
 454         spin_unlock(&kvm_vmid_lock);
 455 }
 456
 457 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 458 {
 459         struct kvm *kvm = vcpu->kvm;
 460         int ret = 0;
 461
 462         if (likely(vcpu->arch.has_run_once))
 463                 return 0;
 464
 465         vcpu->arch.has_run_once = true;
 466
 467         /*
 468          * Map the VGIC hardware resources before running a vcpu the first
 469          * time on this VM.
 470          */
 471         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 472                 ret = kvm_vgic_map_resources(kvm);
 473                 if (ret)
 474                         return ret;
 475         }
 476
 477         /*
 478          * Enable the arch timers only if we have an in-kernel VGIC
 479          * and it has been properly initialized, since we cannot handle
 480          * interrupts from the virtual timer with a userspace gic.
 481          */
 482         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 483                 ret = kvm_timer_enable(vcpu);
 484
 485         return ret;
 486 }
 487
 488 bool kvm_arch_intc_initialized(struct kvm *kvm)
 489 {
 490         return vgic_initialized(kvm);
 491 }
 492
 493 void kvm_arm_halt_guest(struct kvm *kvm)
 494 {
 495         int i;
 496         struct kvm_vcpu *vcpu;
 497
 498         kvm_for_each_vcpu(i, vcpu, kvm)
 499                 vcpu->arch.pause = true;
 500         kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
 501 }
 502
 503 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
 504 {
 505         vcpu->arch.pause = true;
 506         kvm_vcpu_kick(vcpu);
 507 }
 508
 509 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
 510 {
 511         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 512
 513         vcpu->arch.pause = false;
 514         swake_up(wq);
 515 }
 516
 517 void kvm_arm_resume_guest(struct kvm *kvm)
 518 {
 519         int i;
 520         struct kvm_vcpu *vcpu;
 521
 522         kvm_for_each_vcpu(i, vcpu, kvm)
 523                 kvm_arm_resume_vcpu(vcpu);
 524 }
 525
 526 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 527 {
 528         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 529
 530         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 531                                        (!vcpu->arch.pause)));
 532 }
 533
 534 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 535 {
 536         return vcpu->arch.target >= 0;
 537 }
 538
 539 /**
 540  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 541  * @vcpu:       The VCPU pointer
 542  * @run:        The kvm_run structure pointer used for userspace state exchange
 543  *
 544  * This function is called through the VCPU_RUN ioctl called from user space. It
 545  * will execute VM code in a loop until the time slice for the process is used
 546  * or some emulation is needed from user space in which case the function will
 547  * return with return value 0 and with the kvm_run structure filled in with the
 548  * required data for the requested emulation.
 549  */
 550 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 551 {
 552         int ret;
 553         sigset_t sigsaved;
 554
 555         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 556                 return -ENOEXEC;
 557
 558         ret = kvm_vcpu_first_run_init(vcpu);
 559         if (ret)
 560                 return ret;
 561
 562         if (run->exit_reason == KVM_EXIT_MMIO) {
 563                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 564                 if (ret)
 565                         return ret;
 566         }
 567
 568         if (vcpu->sigset_active)
 569                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 570
 571         ret = 1;
 572         run->exit_reason = KVM_EXIT_UNKNOWN;
 573         while (ret > 0) {
 574                 /*
 575                  * Check conditions before entering the guest
 576                  */
 577                 cond_resched();
 578
 579                 update_vttbr(vcpu->kvm);
 580
 581                 if (vcpu->arch.power_off || vcpu->arch.pause)
 582                         vcpu_sleep(vcpu);
 583
 584                 /*
 585                  * Preparing the interrupts to be injected also
 586                  * involves poking the GIC, which must be done in a
 587                  * non-preemptible context.
 588                  */
 589                 preempt_disable();
 590                 kvm_pmu_flush_hwstate(vcpu);
 591                 kvm_timer_flush_hwstate(vcpu);
 592                 kvm_vgic_flush_hwstate(vcpu);
 593
 594                 local_irq_disable();
 595
 596                 /*
 597                  * Re-check atomic conditions
 598                  */
 599                 if (signal_pending(current)) {
 600                         ret = -EINTR;
 601                         run->exit_reason = KVM_EXIT_INTR;
 602                 }
 603
 604                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 605                         vcpu->arch.power_off || vcpu->arch.pause) {
 606                         local_irq_enable();
 607                         kvm_pmu_sync_hwstate(vcpu);
 608                         kvm_timer_sync_hwstate(vcpu);
 609                         kvm_vgic_sync_hwstate(vcpu);
 610                         preempt_enable();
 611                         continue;
 612                 }
 613
 614                 kvm_arm_setup_debug(vcpu);
 615
 616                 /**************************************************************
 617                  * Enter the guest
 618                  */
 619                 trace_kvm_entry(*vcpu_pc(vcpu));
 620                 guest_enter_irqoff();
 621                 vcpu->mode = IN_GUEST_MODE;
 622
 623                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 624
 625                 vcpu->mode = OUTSIDE_GUEST_MODE;
 626                 vcpu->stat.exits++;
 627                 /*
 628                  * Back from guest
 629                  *************************************************************/
 630
 631                 kvm_arm_clear_debug(vcpu);
 632
 633                 /*
 634                  * We may have taken a host interrupt in HYP mode (ie
 635                  * while executing the guest). This interrupt is still
 636                  * pending, as we haven't serviced it yet!
 637                  *
 638                  * We're now back in SVC mode, with interrupts
 639                  * disabled.  Enabling the interrupts now will have
 640                  * the effect of taking the interrupt again, in SVC
 641                  * mode this time.
 642                  */
 643                 local_irq_enable();
 644
 645                 /*
 646                  * We do local_irq_enable() before calling guest_exit() so
 647                  * that if a timer interrupt hits while running the guest we
 648                  * account that tick as being spent in the guest.  We enable
 649                  * preemption after calling guest_exit() so that if we get
 650                  * preempted we make sure ticks after that is not counted as
 651                  * guest time.
 652                  */
 653                 guest_exit();
 654                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 655
 656                 /*
 657                  * We must sync the PMU and timer state before the vgic state so
 658                  * that the vgic can properly sample the updated state of the
 659                  * interrupt line.
 660                  */
 661                 kvm_pmu_sync_hwstate(vcpu);
 662                 kvm_timer_sync_hwstate(vcpu);
 663
 664                 kvm_vgic_sync_hwstate(vcpu);
 665
 666                 preempt_enable();
 667
 668                 ret = handle_exit(vcpu, run, ret);
 669         }
 670
 671         if (vcpu->sigset_active)
 672                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 673         return ret;
 674 }
 675
 676 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 677 {
 678         int bit_index;
 679         bool set;
 680         unsigned long *ptr;
 681
 682         if (number == KVM_ARM_IRQ_CPU_IRQ)
 683                 bit_index = __ffs(HCR_VI);
 684         else /* KVM_ARM_IRQ_CPU_FIQ */
 685                 bit_index = __ffs(HCR_VF);
 686
 687         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 688         if (level)
 689                 set = test_and_set_bit(bit_index, ptr);
 690         else
 691                 set = test_and_clear_bit(bit_index, ptr);
 692
 693         /*
 694          * If we didn't change anything, no need to wake up or kick other CPUs
 695          */
 696         if (set == level)
 697                 return 0;
 698
 699         /*
 700          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 701          * trigger a world-switch round on the running physical CPU to set the
 702          * virtual IRQ/FIQ fields in the HCR appropriately.
 703          */
 704         kvm_vcpu_kick(vcpu);
 705
 706         return 0;
 707 }
 708
 709 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 710                           bool line_status)
 711 {
 712         u32 irq = irq_level->irq;
 713         unsigned int irq_type, vcpu_idx, irq_num;
 714         int nrcpus = atomic_read(&kvm->online_vcpus);
 715         struct kvm_vcpu *vcpu = NULL;
 716         bool level = irq_level->level;
 717
 718         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 719         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 720         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 721
 722         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 723
 724         switch (irq_type) {
 725         case KVM_ARM_IRQ_TYPE_CPU:
 726                 if (irqchip_in_kernel(kvm))
 727                         return -ENXIO;
 728
 729                 if (vcpu_idx >= nrcpus)
 730                         return -EINVAL;
 731
 732                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 733                 if (!vcpu)
 734                         return -EINVAL;
 735
 736                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 737                         return -EINVAL;
 738
 739                 return vcpu_interrupt_line(vcpu, irq_num, level);
 740         case KVM_ARM_IRQ_TYPE_PPI:
 741                 if (!irqchip_in_kernel(kvm))
 742                         return -ENXIO;
 743
 744                 if (vcpu_idx >= nrcpus)
 745                         return -EINVAL;
 746
 747                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 748                 if (!vcpu)
 749                         return -EINVAL;
 750
 751                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 752                         return -EINVAL;
 753
 754                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 755         case KVM_ARM_IRQ_TYPE_SPI:
 756                 if (!irqchip_in_kernel(kvm))
 757                         return -ENXIO;
 758
 759                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 760                         return -EINVAL;
 761
 762                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 763         }
 764
 765         return -EINVAL;
 766 }
 767
 768 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 769                                const struct kvm_vcpu_init *init)
 770 {
 771         unsigned int i;
 772         int phys_target = kvm_target_cpu();
 773
 774         if (init->target != phys_target)
 775                 return -EINVAL;
 776
 777         /*
 778          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 779          * use the same target.
 780          */
 781         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 782                 return -EINVAL;
 783
 784         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 785         for (i = 0; i < sizeof(init->features) * 8; i++) {
 786                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 787
 788                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 789                         return -ENOENT;
 790
 791                 /*
 792                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 793                  * use the same feature set.
 794                  */
 795                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 796                     test_bit(i, vcpu->arch.features) != set)
 797                         return -EINVAL;
 798
 799                 if (set)
 800                         set_bit(i, vcpu->arch.features);
 801         }
 802
 803         vcpu->arch.target = phys_target;
 804
 805         /* Now we know what it is, we can reset it. */
 806         return kvm_reset_vcpu(vcpu);
 807 }
 808
 809
 810 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 811                                          struct kvm_vcpu_init *init)
 812 {
 813         int ret;
 814
 815         ret = kvm_vcpu_set_target(vcpu, init);
 816         if (ret)
 817                 return ret;
 818
 819         /*
 820          * Ensure a rebooted VM will fault in RAM pages and detect if the
 821          * guest MMU is turned off and flush the caches as needed.
 822          */
 823         if (vcpu->arch.has_run_once)
 824                 stage2_unmap_vm(vcpu->kvm);
 825
 826         vcpu_reset_hcr(vcpu);
 827
 828         /*
 829          * Handle the "start in power-off" case.
 830          */
 831         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 832                 vcpu->arch.power_off = true;
 833         else
 834                 vcpu->arch.power_off = false;
 835
 836         return 0;
 837 }
 838
 839 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 840                                  struct kvm_device_attr *attr)
 841 {
 842         int ret = -ENXIO;
 843
 844         switch (attr->group) {
 845         default:
 846                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 847                 break;
 848         }
 849
 850         return ret;
 851 }
 852
 853 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 854                                  struct kvm_device_attr *attr)
 855 {
 856         int ret = -ENXIO;
 857
 858         switch (attr->group) {
 859         default:
 860                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 861                 break;
 862         }
 863
 864         return ret;
 865 }
 866
 867 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 868                                  struct kvm_device_attr *attr)
 869 {
 870         int ret = -ENXIO;
 871
 872         switch (attr->group) {
 873         default:
 874                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 875                 break;
 876         }
 877
 878         return ret;
 879 }
 880
 881 long kvm_arch_vcpu_ioctl(struct file *filp,
 882                          unsigned int ioctl, unsigned long arg)
 883 {
 884         struct kvm_vcpu *vcpu = filp->private_data;
 885         void __user *argp = (void __user *)arg;
 886         struct kvm_device_attr attr;
 887
 888         switch (ioctl) {
 889         case KVM_ARM_VCPU_INIT: {
 890                 struct kvm_vcpu_init init;
 891
 892                 if (copy_from_user(&init, argp, sizeof(init)))
 893                         return -EFAULT;
 894
 895                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 896         }
 897         case KVM_SET_ONE_REG:
 898         case KVM_GET_ONE_REG: {
 899                 struct kvm_one_reg reg;
 900
 901                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 902                         return -ENOEXEC;
 903
 904                 if (copy_from_user(&reg, argp, sizeof(reg)))
 905                         return -EFAULT;
 906                 if (ioctl == KVM_SET_ONE_REG)
 907                         return kvm_arm_set_reg(vcpu, &reg);
 908                 else
 909                         return kvm_arm_get_reg(vcpu, &reg);
 910         }
 911         case KVM_GET_REG_LIST: {
 912                 struct kvm_reg_list __user *user_list = argp;
 913                 struct kvm_reg_list reg_list;
 914                 unsigned n;
 915
 916                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 917                         return -ENOEXEC;
 918
 919                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 920                         return -EFAULT;
 921                 n = reg_list.n;
 922                 reg_list.n = kvm_arm_num_regs(vcpu);
 923                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 924                         return -EFAULT;
 925                 if (n < reg_list.n)
 926                         return -E2BIG;
 927                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 928         }
 929         case KVM_SET_DEVICE_ATTR: {
 930                 if (copy_from_user(&attr, argp, sizeof(attr)))
 931                         return -EFAULT;
 932                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 933         }
 934         case KVM_GET_DEVICE_ATTR: {
 935                 if (copy_from_user(&attr, argp, sizeof(attr)))
 936                         return -EFAULT;
 937                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 938         }
 939         case KVM_HAS_DEVICE_ATTR: {
 940                 if (copy_from_user(&attr, argp, sizeof(attr)))
 941                         return -EFAULT;
 942                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 943         }
 944         default:
 945                 return -EINVAL;
 946         }
 947 }
 948
 949 /**
 950  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 951  * @kvm: kvm instance
 952  * @log: slot id and address to which we copy the log
 953  *
 954  * Steps 1-4 below provide general overview of dirty page logging. See
 955  * kvm_get_dirty_log_protect() function description for additional details.
 956  *
 957  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 958  * always flush the TLB (step 4) even if previous step failed  and the dirty
 959  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 960  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 961  * writes will be marked dirty for next log read.
 962  *
 963  *   1. Take a snapshot of the bit and clear it if needed.
 964  *   2. Write protect the corresponding page.
 965  *   3. Copy the snapshot to the userspace.
 966  *   4. Flush TLB's if needed.
 967  */
 968 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 969 {
 970         bool is_dirty = false;
 971         int r;
 972
 973         mutex_lock(&kvm->slots_lock);
 974
 975         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 976
 977         if (is_dirty)
 978                 kvm_flush_remote_tlbs(kvm);
 979
 980         mutex_unlock(&kvm->slots_lock);
 981         return r;
 982 }
 983
 984 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 985                                         struct kvm_arm_device_addr *dev_addr)
 986 {
 987         unsigned long dev_id, type;
 988
 989         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 990                 KVM_ARM_DEVICE_ID_SHIFT;
 991         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 992                 KVM_ARM_DEVICE_TYPE_SHIFT;
 993
 994         switch (dev_id) {
 995         case KVM_ARM_DEVICE_VGIC_V2:
 996                 if (!vgic_present)
 997                         return -ENXIO;
 998                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
 999         default:
1000                 return -ENODEV;
1001         }
1002 }
1003
1004 long kvm_arch_vm_ioctl(struct file *filp,
1005                        unsigned int ioctl, unsigned long arg)
1006 {
1007         struct kvm *kvm = filp->private_data;
1008         void __user *argp = (void __user *)arg;
1009
1010         switch (ioctl) {
1011         case KVM_CREATE_IRQCHIP: {
1012                 int ret;
1013                 if (!vgic_present)
1014                         return -ENXIO;
1015                 mutex_lock(&kvm->lock);
1016                 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1017                 mutex_unlock(&kvm->lock);
1018                 return ret;
1019         }
1020         case KVM_ARM_SET_DEVICE_ADDR: {
1021                 struct kvm_arm_device_addr dev_addr;
1022
1023                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1024                         return -EFAULT;
1025                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1026         }
1027         case KVM_ARM_PREFERRED_TARGET: {
1028                 int err;
1029                 struct kvm_vcpu_init init;
1030
1031                 err = kvm_vcpu_preferred_target(&init);
1032                 if (err)
1033                         return err;
1034
1035                 if (copy_to_user(argp, &init, sizeof(init)))
1036                         return -EFAULT;
1037
1038                 return 0;
1039         }
1040         default:
1041                 return -EINVAL;
1042         }
1043 }
1044
1045 static void cpu_init_hyp_mode(void *dummy)
1046 {
1047         phys_addr_t pgd_ptr;
1048         unsigned long hyp_stack_ptr;
1049         unsigned long stack_page;
1050         unsigned long vector_ptr;
1051
1052         /* Switch from the HYP stub to our own HYP init vector */
1053         __hyp_set_vectors(kvm_get_idmap_vector());
1054
1055         pgd_ptr = kvm_mmu_get_httbr();
1056         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1057         hyp_stack_ptr = stack_page + PAGE_SIZE;
1058         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1059
1060         __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1061         __cpu_init_stage2();
1062
1063         kvm_arm_init_debug();
1064 }
1065
1066 static void cpu_hyp_reinit(void)
1067 {
1068         if (is_kernel_in_hyp_mode()) {
1069                 /*
1070                  * __cpu_init_stage2() is safe to call even if the PM
1071                  * event was cancelled before the CPU was reset.
1072                  */
1073                 __cpu_init_stage2();
1074         } else {
1075                 if (__hyp_get_vectors() == hyp_default_vectors)
1076                         cpu_init_hyp_mode(NULL);
1077         }
1078 }
1079
1080 static void cpu_hyp_reset(void)
1081 {
1082         if (!is_kernel_in_hyp_mode())
1083                 __cpu_reset_hyp_mode(hyp_default_vectors,
1084                                      kvm_get_idmap_start());
1085 }
1086
1087 static void _kvm_arch_hardware_enable(void *discard)
1088 {
1089         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1090                 cpu_hyp_reinit();
1091                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1092         }
1093 }
1094
1095 int kvm_arch_hardware_enable(void)
1096 {
1097         _kvm_arch_hardware_enable(NULL);
1098         return 0;
1099 }
1100
1101 static void _kvm_arch_hardware_disable(void *discard)
1102 {
1103         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1104                 cpu_hyp_reset();
1105                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1106         }
1107 }
1108
1109 void kvm_arch_hardware_disable(void)
1110 {
1111         _kvm_arch_hardware_disable(NULL);
1112 }
1113
1114 #ifdef CONFIG_CPU_PM
1115 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1116                                     unsigned long cmd,
1117                                     void *v)
1118 {
1119         /*
1120          * kvm_arm_hardware_enabled is left with its old value over
1121          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1122          * re-enable hyp.
1123          */
1124         switch (cmd) {
1125         case CPU_PM_ENTER:
1126                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1127                         /*
1128                          * don't update kvm_arm_hardware_enabled here
1129                          * so that the hardware will be re-enabled
1130                          * when we resume. See below.
1131                          */
1132                         cpu_hyp_reset();
1133
1134                 return NOTIFY_OK;
1135         case CPU_PM_EXIT:
1136                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1137                         /* The hardware was enabled before suspend. */
1138                         cpu_hyp_reinit();
1139
1140                 return NOTIFY_OK;
1141
1142         default:
1143                 return NOTIFY_DONE;
1144         }
1145 }
1146
1147 static struct notifier_block hyp_init_cpu_pm_nb = {
1148         .notifier_call = hyp_init_cpu_pm_notifier,
1149 };
1150
1151 static void __init hyp_cpu_pm_init(void)
1152 {
1153         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1154 }
1155 static void __init hyp_cpu_pm_exit(void)
1156 {
1157         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1158 }
1159 #else
1160 static inline void hyp_cpu_pm_init(void)
1161 {
1162 }
1163 static inline void hyp_cpu_pm_exit(void)
1164 {
1165 }
1166 #endif
1167
1168 static void teardown_common_resources(void)
1169 {
1170         free_percpu(kvm_host_cpu_state);
1171 }
1172
1173 static int init_common_resources(void)
1174 {
1175         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1176         if (!kvm_host_cpu_state) {
1177                 kvm_err("Cannot allocate host CPU state\n");
1178                 return -ENOMEM;
1179         }
1180
1181         return 0;
1182 }
1183
1184 static int init_subsystems(void)
1185 {
1186         int err = 0;
1187
1188         /*
1189          * Enable hardware so that subsystem initialisation can access EL2.
1190          */
1191         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1192
1193         /*
1194          * Register CPU lower-power notifier
1195          */
1196         hyp_cpu_pm_init();
1197
1198         /*
1199          * Init HYP view of VGIC
1200          */
1201         err = kvm_vgic_hyp_init();
1202         switch (err) {
1203         case 0:
1204                 vgic_present = true;
1205                 break;
1206         case -ENODEV:
1207         case -ENXIO:
1208                 vgic_present = false;
1209                 err = 0;
1210                 break;
1211         default:
1212                 goto out;
1213         }
1214
1215         /*
1216          * Init HYP architected timer support
1217          */
1218         err = kvm_timer_hyp_init();
1219         if (err)
1220                 goto out;
1221
1222         kvm_perf_init();
1223         kvm_coproc_table_init();
1224
1225 out:
1226         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1227
1228         return err;
1229 }
1230
1231 static void teardown_hyp_mode(void)
1232 {
1233         int cpu;
1234
1235         if (is_kernel_in_hyp_mode())
1236                 return;
1237
1238         free_hyp_pgds();
1239         for_each_possible_cpu(cpu)
1240                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1241         hyp_cpu_pm_exit();
1242 }
1243
1244 static int init_vhe_mode(void)
1245 {
1246         /* set size of VMID supported by CPU */
1247         kvm_vmid_bits = kvm_get_vmid_bits();
1248         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1249
1250         kvm_info("VHE mode initialized successfully\n");
1251         return 0;
1252 }
1253
1254 /**
1255  * Inits Hyp-mode on all online CPUs
1256  */
1257 static int init_hyp_mode(void)
1258 {
1259         int cpu;
1260         int err = 0;
1261
1262         /*
1263          * Allocate Hyp PGD and setup Hyp identity mapping
1264          */
1265         err = kvm_mmu_init();
1266         if (err)
1267                 goto out_err;
1268
1269         /*
1270          * It is probably enough to obtain the default on one
1271          * CPU. It's unlikely to be different on the others.
1272          */
1273         hyp_default_vectors = __hyp_get_vectors();
1274
1275         /*
1276          * Allocate stack pages for Hypervisor-mode
1277          */
1278         for_each_possible_cpu(cpu) {
1279                 unsigned long stack_page;
1280
1281                 stack_page = __get_free_page(GFP_KERNEL);
1282                 if (!stack_page) {
1283                         err = -ENOMEM;
1284                         goto out_err;
1285                 }
1286
1287                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1288         }
1289
1290         /*
1291          * Map the Hyp-code called directly from the host
1292          */
1293         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1294                                   kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1295         if (err) {
1296                 kvm_err("Cannot map world-switch code\n");
1297                 goto out_err;
1298         }
1299
1300         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1301                                   kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1302         if (err) {
1303                 kvm_err("Cannot map rodata section\n");
1304                 goto out_err;
1305         }
1306
1307         /*
1308          * Map the Hyp stack pages
1309          */
1310         for_each_possible_cpu(cpu) {
1311                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1312                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1313                                           PAGE_HYP);
1314
1315                 if (err) {
1316                         kvm_err("Cannot map hyp stack\n");
1317                         goto out_err;
1318                 }
1319         }
1320
1321         for_each_possible_cpu(cpu) {
1322                 kvm_cpu_context_t *cpu_ctxt;
1323
1324                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1325                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1326
1327                 if (err) {
1328                         kvm_err("Cannot map host CPU state: %d\n", err);
1329                         goto out_err;
1330                 }
1331         }
1332
1333         /* set size of VMID supported by CPU */
1334         kvm_vmid_bits = kvm_get_vmid_bits();
1335         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1336
1337         kvm_info("Hyp mode initialized successfully\n");
1338
1339         return 0;
1340
1341 out_err:
1342         teardown_hyp_mode();
1343         kvm_err("error initializing Hyp mode: %d\n", err);
1344         return err;
1345 }
1346
1347 static void check_kvm_target_cpu(void *ret)
1348 {
1349         *(int *)ret = kvm_target_cpu();
1350 }
1351
1352 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1353 {
1354         struct kvm_vcpu *vcpu;
1355         int i;
1356
1357         mpidr &= MPIDR_HWID_BITMASK;
1358         kvm_for_each_vcpu(i, vcpu, kvm) {
1359                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1360                         return vcpu;
1361         }
1362         return NULL;
1363 }
1364
1365 /**
1366  * Initialize Hyp-mode and memory mappings on all CPUs.
1367  */
1368 int kvm_arch_init(void *opaque)
1369 {
1370         int err;
1371         int ret, cpu;
1372
1373         if (!is_hyp_mode_available()) {
1374                 kvm_err("HYP mode not available\n");
1375                 return -ENODEV;
1376         }
1377
1378         for_each_online_cpu(cpu) {
1379                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1380                 if (ret < 0) {
1381                         kvm_err("Error, CPU %d not supported!\n", cpu);
1382                         return -ENODEV;
1383                 }
1384         }
1385
1386         err = init_common_resources();
1387         if (err)
1388                 return err;
1389
1390         if (is_kernel_in_hyp_mode())
1391                 err = init_vhe_mode();
1392         else
1393                 err = init_hyp_mode();
1394         if (err)
1395                 goto out_err;
1396
1397         err = init_subsystems();
1398         if (err)
1399                 goto out_hyp;
1400
1401         return 0;
1402
1403 out_hyp:
1404         teardown_hyp_mode();
1405 out_err:
1406         teardown_common_resources();
1407         return err;
1408 }
1409
1410 /* NOP: Compiling as a module not supported */
1411 void kvm_arch_exit(void)
1412 {
1413         kvm_perf_teardown();
1414 }
1415
1416 static int arm_init(void)
1417 {
1418         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1419         return rc;
1420 }
1421
1422 module_init(arm_init);