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 bool kvm_arch_has_vcpu_debugfs(void)
 148 {
 149         return false;
 150 }
 151
 152 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 153 {
 154         return 0;
 155 }
 156
 157 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 158 {
 159         return VM_FAULT_SIGBUS;
 160 }
 161
 162
 163 /**
 164  * kvm_arch_destroy_vm - destroy the VM data structure
 165  * @kvm:        pointer to the KVM struct
 166  */
 167 void kvm_arch_destroy_vm(struct kvm *kvm)
 168 {
 169         int i;
 170
 171         kvm_free_stage2_pgd(kvm);
 172
 173         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 174                 if (kvm->vcpus[i]) {
 175                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 176                         kvm->vcpus[i] = NULL;
 177                 }
 178         }
 179
 180         kvm_vgic_destroy(kvm);
 181 }
 182
 183 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 184 {
 185         int r;
 186         switch (ext) {
 187         case KVM_CAP_IRQCHIP:
 188                 r = vgic_present;
 189                 break;
 190         case KVM_CAP_IOEVENTFD:
 191         case KVM_CAP_DEVICE_CTRL:
 192         case KVM_CAP_USER_MEMORY:
 193         case KVM_CAP_SYNC_MMU:
 194         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 195         case KVM_CAP_ONE_REG:
 196         case KVM_CAP_ARM_PSCI:
 197         case KVM_CAP_ARM_PSCI_0_2:
 198         case KVM_CAP_READONLY_MEM:
 199         case KVM_CAP_MP_STATE:
 200                 r = 1;
 201                 break;
 202         case KVM_CAP_COALESCED_MMIO:
 203                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 204                 break;
 205         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 206                 r = 1;
 207                 break;
 208         case KVM_CAP_NR_VCPUS:
 209                 r = num_online_cpus();
 210                 break;
 211         case KVM_CAP_MAX_VCPUS:
 212                 r = KVM_MAX_VCPUS;
 213                 break;
 214         default:
 215                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
 216                 break;
 217         }
 218         return r;
 219 }
 220
 221 long kvm_arch_dev_ioctl(struct file *filp,
 222                         unsigned int ioctl, unsigned long arg)
 223 {
 224         return -EINVAL;
 225 }
 226
 227
 228 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 229 {
 230         int err;
 231         struct kvm_vcpu *vcpu;
 232
 233         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 234                 err = -EBUSY;
 235                 goto out;
 236         }
 237
 238         if (id >= kvm->arch.max_vcpus) {
 239                 err = -EINVAL;
 240                 goto out;
 241         }
 242
 243         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 244         if (!vcpu) {
 245                 err = -ENOMEM;
 246                 goto out;
 247         }
 248
 249         err = kvm_vcpu_init(vcpu, kvm, id);
 250         if (err)
 251                 goto free_vcpu;
 252
 253         err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 254         if (err)
 255                 goto vcpu_uninit;
 256
 257         return vcpu;
 258 vcpu_uninit:
 259         kvm_vcpu_uninit(vcpu);
 260 free_vcpu:
 261         kmem_cache_free(kvm_vcpu_cache, vcpu);
 262 out:
 263         return ERR_PTR(err);
 264 }
 265
 266 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 267 {
 268         kvm_vgic_vcpu_early_init(vcpu);
 269 }
 270
 271 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 272 {
 273         kvm_mmu_free_memory_caches(vcpu);
 274         kvm_timer_vcpu_terminate(vcpu);
 275         kvm_vgic_vcpu_destroy(vcpu);
 276         kvm_pmu_vcpu_destroy(vcpu);
 277         kvm_vcpu_uninit(vcpu);
 278         kmem_cache_free(kvm_vcpu_cache, vcpu);
 279 }
 280
 281 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 282 {
 283         kvm_arch_vcpu_free(vcpu);
 284 }
 285
 286 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 287 {
 288         return kvm_timer_should_fire(vcpu);
 289 }
 290
 291 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 292 {
 293         kvm_timer_schedule(vcpu);
 294 }
 295
 296 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 297 {
 298         kvm_timer_unschedule(vcpu);
 299 }
 300
 301 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 302 {
 303         /* Force users to call KVM_ARM_VCPU_INIT */
 304         vcpu->arch.target = -1;
 305         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 306
 307         /* Set up the timer */
 308         kvm_timer_vcpu_init(vcpu);
 309
 310         kvm_arm_reset_debug_ptr(vcpu);
 311
 312         return 0;
 313 }
 314
 315 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 316 {
 317         vcpu->cpu = cpu;
 318         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 319
 320         kvm_arm_set_running_vcpu(vcpu);
 321 }
 322
 323 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 324 {
 325         /*
 326          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 327          * if the vcpu is no longer assigned to a cpu.  This is used for the
 328          * optimized make_all_cpus_request path.
 329          */
 330         vcpu->cpu = -1;
 331
 332         kvm_arm_set_running_vcpu(NULL);
 333         kvm_timer_vcpu_put(vcpu);
 334 }
 335
 336 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 337                                     struct kvm_mp_state *mp_state)
 338 {
 339         if (vcpu->arch.power_off)
 340                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 341         else
 342                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 343
 344         return 0;
 345 }
 346
 347 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 348                                     struct kvm_mp_state *mp_state)
 349 {
 350         switch (mp_state->mp_state) {
 351         case KVM_MP_STATE_RUNNABLE:
 352                 vcpu->arch.power_off = false;
 353                 break;
 354         case KVM_MP_STATE_STOPPED:
 355                 vcpu->arch.power_off = true;
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         return 0;
 362 }
 363
 364 /**
 365  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 366  * @v:          The VCPU pointer
 367  *
 368  * If the guest CPU is not waiting for interrupts or an interrupt line is
 369  * asserted, the CPU is by definition runnable.
 370  */
 371 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 372 {
 373         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 374                 && !v->arch.power_off && !v->arch.pause);
 375 }
 376
 377 /* Just ensure a guest exit from a particular CPU */
 378 static void exit_vm_noop(void *info)
 379 {
 380 }
 381
 382 void force_vm_exit(const cpumask_t *mask)
 383 {
 384         preempt_disable();
 385         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 386         preempt_enable();
 387 }
 388
 389 /**
 390  * need_new_vmid_gen - check that the VMID is still valid
 391  * @kvm: The VM's VMID to check
 392  *
 393  * return true if there is a new generation of VMIDs being used
 394  *
 395  * The hardware supports only 256 values with the value zero reserved for the
 396  * host, so we check if an assigned value belongs to a previous generation,
 397  * which which requires us to assign a new value. If we're the first to use a
 398  * VMID for the new generation, we must flush necessary caches and TLBs on all
 399  * CPUs.
 400  */
 401 static bool need_new_vmid_gen(struct kvm *kvm)
 402 {
 403         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 404 }
 405
 406 /**
 407  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 408  * @kvm The guest that we are about to run
 409  *
 410  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 411  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 412  * caches and TLBs.
 413  */
 414 static void update_vttbr(struct kvm *kvm)
 415 {
 416         phys_addr_t pgd_phys;
 417         u64 vmid;
 418
 419         if (!need_new_vmid_gen(kvm))
 420                 return;
 421
 422         spin_lock(&kvm_vmid_lock);
 423
 424         /*
 425          * We need to re-check the vmid_gen here to ensure that if another vcpu
 426          * already allocated a valid vmid for this vm, then this vcpu should
 427          * use the same vmid.
 428          */
 429         if (!need_new_vmid_gen(kvm)) {
 430                 spin_unlock(&kvm_vmid_lock);
 431                 return;
 432         }
 433
 434         /* First user of a new VMID generation? */
 435         if (unlikely(kvm_next_vmid == 0)) {
 436                 atomic64_inc(&kvm_vmid_gen);
 437                 kvm_next_vmid = 1;
 438
 439                 /*
 440                  * On SMP we know no other CPUs can use this CPU's or each
 441                  * other's VMID after force_vm_exit returns since the
 442                  * kvm_vmid_lock blocks them from reentry to the guest.
 443                  */
 444                 force_vm_exit(cpu_all_mask);
 445                 /*
 446                  * Now broadcast TLB + ICACHE invalidation over the inner
 447                  * shareable domain to make sure all data structures are
 448                  * clean.
 449                  */
 450                 kvm_call_hyp(__kvm_flush_vm_context);
 451         }
 452
 453         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 454         kvm->arch.vmid = kvm_next_vmid;
 455         kvm_next_vmid++;
 456         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 457
 458         /* update vttbr to be used with the new vmid */
 459         pgd_phys = virt_to_phys(kvm->arch.pgd);
 460         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 461         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 462         kvm->arch.vttbr = pgd_phys | vmid;
 463
 464         spin_unlock(&kvm_vmid_lock);
 465 }
 466
 467 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 468 {
 469         struct kvm *kvm = vcpu->kvm;
 470         int ret = 0;
 471
 472         if (likely(vcpu->arch.has_run_once))
 473                 return 0;
 474
 475         vcpu->arch.has_run_once = true;
 476
 477         /*
 478          * Map the VGIC hardware resources before running a vcpu the first
 479          * time on this VM.
 480          */
 481         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 482                 ret = kvm_vgic_map_resources(kvm);
 483                 if (ret)
 484                         return ret;
 485         }
 486
 487         /*
 488          * Enable the arch timers only if we have an in-kernel VGIC
 489          * and it has been properly initialized, since we cannot handle
 490          * interrupts from the virtual timer with a userspace gic.
 491          */
 492         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 493                 ret = kvm_timer_enable(vcpu);
 494
 495         return ret;
 496 }
 497
 498 bool kvm_arch_intc_initialized(struct kvm *kvm)
 499 {
 500         return vgic_initialized(kvm);
 501 }
 502
 503 void kvm_arm_halt_guest(struct kvm *kvm)
 504 {
 505         int i;
 506         struct kvm_vcpu *vcpu;
 507
 508         kvm_for_each_vcpu(i, vcpu, kvm)
 509                 vcpu->arch.pause = true;
 510         kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
 511 }
 512
 513 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
 514 {
 515         vcpu->arch.pause = true;
 516         kvm_vcpu_kick(vcpu);
 517 }
 518
 519 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
 520 {
 521         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 522
 523         vcpu->arch.pause = false;
 524         swake_up(wq);
 525 }
 526
 527 void kvm_arm_resume_guest(struct kvm *kvm)
 528 {
 529         int i;
 530         struct kvm_vcpu *vcpu;
 531
 532         kvm_for_each_vcpu(i, vcpu, kvm)
 533                 kvm_arm_resume_vcpu(vcpu);
 534 }
 535
 536 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 537 {
 538         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 539
 540         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 541                                        (!vcpu->arch.pause)));
 542 }
 543
 544 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 545 {
 546         return vcpu->arch.target >= 0;
 547 }
 548
 549 /**
 550  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 551  * @vcpu:       The VCPU pointer
 552  * @run:        The kvm_run structure pointer used for userspace state exchange
 553  *
 554  * This function is called through the VCPU_RUN ioctl called from user space. It
 555  * will execute VM code in a loop until the time slice for the process is used
 556  * or some emulation is needed from user space in which case the function will
 557  * return with return value 0 and with the kvm_run structure filled in with the
 558  * required data for the requested emulation.
 559  */
 560 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 561 {
 562         int ret;
 563         sigset_t sigsaved;
 564
 565         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 566                 return -ENOEXEC;
 567
 568         ret = kvm_vcpu_first_run_init(vcpu);
 569         if (ret)
 570                 return ret;
 571
 572         if (run->exit_reason == KVM_EXIT_MMIO) {
 573                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 574                 if (ret)
 575                         return ret;
 576         }
 577
 578         if (vcpu->sigset_active)
 579                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 580
 581         ret = 1;
 582         run->exit_reason = KVM_EXIT_UNKNOWN;
 583         while (ret > 0) {
 584                 /*
 585                  * Check conditions before entering the guest
 586                  */
 587                 cond_resched();
 588
 589                 update_vttbr(vcpu->kvm);
 590
 591                 if (vcpu->arch.power_off || vcpu->arch.pause)
 592                         vcpu_sleep(vcpu);
 593
 594                 /*
 595                  * Preparing the interrupts to be injected also
 596                  * involves poking the GIC, which must be done in a
 597                  * non-preemptible context.
 598                  */
 599                 preempt_disable();
 600                 kvm_pmu_flush_hwstate(vcpu);
 601                 kvm_timer_flush_hwstate(vcpu);
 602                 kvm_vgic_flush_hwstate(vcpu);
 603
 604                 local_irq_disable();
 605
 606                 /*
 607                  * Re-check atomic conditions
 608                  */
 609                 if (signal_pending(current)) {
 610                         ret = -EINTR;
 611                         run->exit_reason = KVM_EXIT_INTR;
 612                 }
 613
 614                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 615                         vcpu->arch.power_off || vcpu->arch.pause) {
 616                         local_irq_enable();
 617                         kvm_pmu_sync_hwstate(vcpu);
 618                         kvm_timer_sync_hwstate(vcpu);
 619                         kvm_vgic_sync_hwstate(vcpu);
 620                         preempt_enable();
 621                         continue;
 622                 }
 623
 624                 kvm_arm_setup_debug(vcpu);
 625
 626                 /**************************************************************
 627                  * Enter the guest
 628                  */
 629                 trace_kvm_entry(*vcpu_pc(vcpu));
 630                 guest_enter_irqoff();
 631                 vcpu->mode = IN_GUEST_MODE;
 632
 633                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 634
 635                 vcpu->mode = OUTSIDE_GUEST_MODE;
 636                 vcpu->stat.exits++;
 637                 /*
 638                  * Back from guest
 639                  *************************************************************/
 640
 641                 kvm_arm_clear_debug(vcpu);
 642
 643                 /*
 644                  * We may have taken a host interrupt in HYP mode (ie
 645                  * while executing the guest). This interrupt is still
 646                  * pending, as we haven't serviced it yet!
 647                  *
 648                  * We're now back in SVC mode, with interrupts
 649                  * disabled.  Enabling the interrupts now will have
 650                  * the effect of taking the interrupt again, in SVC
 651                  * mode this time.
 652                  */
 653                 local_irq_enable();
 654
 655                 /*
 656                  * We do local_irq_enable() before calling guest_exit() so
 657                  * that if a timer interrupt hits while running the guest we
 658                  * account that tick as being spent in the guest.  We enable
 659                  * preemption after calling guest_exit() so that if we get
 660                  * preempted we make sure ticks after that is not counted as
 661                  * guest time.
 662                  */
 663                 guest_exit();
 664                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 665
 666                 /*
 667                  * We must sync the PMU and timer state before the vgic state so
 668                  * that the vgic can properly sample the updated state of the
 669                  * interrupt line.
 670                  */
 671                 kvm_pmu_sync_hwstate(vcpu);
 672                 kvm_timer_sync_hwstate(vcpu);
 673
 674                 kvm_vgic_sync_hwstate(vcpu);
 675
 676                 preempt_enable();
 677
 678                 ret = handle_exit(vcpu, run, ret);
 679         }
 680
 681         if (vcpu->sigset_active)
 682                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 683         return ret;
 684 }
 685
 686 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 687 {
 688         int bit_index;
 689         bool set;
 690         unsigned long *ptr;
 691
 692         if (number == KVM_ARM_IRQ_CPU_IRQ)
 693                 bit_index = __ffs(HCR_VI);
 694         else /* KVM_ARM_IRQ_CPU_FIQ */
 695                 bit_index = __ffs(HCR_VF);
 696
 697         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 698         if (level)
 699                 set = test_and_set_bit(bit_index, ptr);
 700         else
 701                 set = test_and_clear_bit(bit_index, ptr);
 702
 703         /*
 704          * If we didn't change anything, no need to wake up or kick other CPUs
 705          */
 706         if (set == level)
 707                 return 0;
 708
 709         /*
 710          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 711          * trigger a world-switch round on the running physical CPU to set the
 712          * virtual IRQ/FIQ fields in the HCR appropriately.
 713          */
 714         kvm_vcpu_kick(vcpu);
 715
 716         return 0;
 717 }
 718
 719 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 720                           bool line_status)
 721 {
 722         u32 irq = irq_level->irq;
 723         unsigned int irq_type, vcpu_idx, irq_num;
 724         int nrcpus = atomic_read(&kvm->online_vcpus);
 725         struct kvm_vcpu *vcpu = NULL;
 726         bool level = irq_level->level;
 727
 728         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 729         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 730         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 731
 732         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 733
 734         switch (irq_type) {
 735         case KVM_ARM_IRQ_TYPE_CPU:
 736                 if (irqchip_in_kernel(kvm))
 737                         return -ENXIO;
 738
 739                 if (vcpu_idx >= nrcpus)
 740                         return -EINVAL;
 741
 742                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 743                 if (!vcpu)
 744                         return -EINVAL;
 745
 746                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 747                         return -EINVAL;
 748
 749                 return vcpu_interrupt_line(vcpu, irq_num, level);
 750         case KVM_ARM_IRQ_TYPE_PPI:
 751                 if (!irqchip_in_kernel(kvm))
 752                         return -ENXIO;
 753
 754                 if (vcpu_idx >= nrcpus)
 755                         return -EINVAL;
 756
 757                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 758                 if (!vcpu)
 759                         return -EINVAL;
 760
 761                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 762                         return -EINVAL;
 763
 764                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 765         case KVM_ARM_IRQ_TYPE_SPI:
 766                 if (!irqchip_in_kernel(kvm))
 767                         return -ENXIO;
 768
 769                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 770                         return -EINVAL;
 771
 772                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 773         }
 774
 775         return -EINVAL;
 776 }
 777
 778 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 779                                const struct kvm_vcpu_init *init)
 780 {
 781         unsigned int i;
 782         int phys_target = kvm_target_cpu();
 783
 784         if (init->target != phys_target)
 785                 return -EINVAL;
 786
 787         /*
 788          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 789          * use the same target.
 790          */
 791         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 792                 return -EINVAL;
 793
 794         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 795         for (i = 0; i < sizeof(init->features) * 8; i++) {
 796                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 797
 798                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 799                         return -ENOENT;
 800
 801                 /*
 802                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 803                  * use the same feature set.
 804                  */
 805                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 806                     test_bit(i, vcpu->arch.features) != set)
 807                         return -EINVAL;
 808
 809                 if (set)
 810                         set_bit(i, vcpu->arch.features);
 811         }
 812
 813         vcpu->arch.target = phys_target;
 814
 815         /* Now we know what it is, we can reset it. */
 816         return kvm_reset_vcpu(vcpu);
 817 }
 818
 819
 820 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 821                                          struct kvm_vcpu_init *init)
 822 {
 823         int ret;
 824
 825         ret = kvm_vcpu_set_target(vcpu, init);
 826         if (ret)
 827                 return ret;
 828
 829         /*
 830          * Ensure a rebooted VM will fault in RAM pages and detect if the
 831          * guest MMU is turned off and flush the caches as needed.
 832          */
 833         if (vcpu->arch.has_run_once)
 834                 stage2_unmap_vm(vcpu->kvm);
 835
 836         vcpu_reset_hcr(vcpu);
 837
 838         /*
 839          * Handle the "start in power-off" case.
 840          */
 841         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 842                 vcpu->arch.power_off = true;
 843         else
 844                 vcpu->arch.power_off = false;
 845
 846         return 0;
 847 }
 848
 849 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 850                                  struct kvm_device_attr *attr)
 851 {
 852         int ret = -ENXIO;
 853
 854         switch (attr->group) {
 855         default:
 856                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 857                 break;
 858         }
 859
 860         return ret;
 861 }
 862
 863 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 864                                  struct kvm_device_attr *attr)
 865 {
 866         int ret = -ENXIO;
 867
 868         switch (attr->group) {
 869         default:
 870                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 871                 break;
 872         }
 873
 874         return ret;
 875 }
 876
 877 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 878                                  struct kvm_device_attr *attr)
 879 {
 880         int ret = -ENXIO;
 881
 882         switch (attr->group) {
 883         default:
 884                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 885                 break;
 886         }
 887
 888         return ret;
 889 }
 890
 891 long kvm_arch_vcpu_ioctl(struct file *filp,
 892                          unsigned int ioctl, unsigned long arg)
 893 {
 894         struct kvm_vcpu *vcpu = filp->private_data;
 895         void __user *argp = (void __user *)arg;
 896         struct kvm_device_attr attr;
 897
 898         switch (ioctl) {
 899         case KVM_ARM_VCPU_INIT: {
 900                 struct kvm_vcpu_init init;
 901
 902                 if (copy_from_user(&init, argp, sizeof(init)))
 903                         return -EFAULT;
 904
 905                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 906         }
 907         case KVM_SET_ONE_REG:
 908         case KVM_GET_ONE_REG: {
 909                 struct kvm_one_reg reg;
 910
 911                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 912                         return -ENOEXEC;
 913
 914                 if (copy_from_user(&reg, argp, sizeof(reg)))
 915                         return -EFAULT;
 916                 if (ioctl == KVM_SET_ONE_REG)
 917                         return kvm_arm_set_reg(vcpu, &reg);
 918                 else
 919                         return kvm_arm_get_reg(vcpu, &reg);
 920         }
 921         case KVM_GET_REG_LIST: {
 922                 struct kvm_reg_list __user *user_list = argp;
 923                 struct kvm_reg_list reg_list;
 924                 unsigned n;
 925
 926                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 927                         return -ENOEXEC;
 928
 929                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 930                         return -EFAULT;
 931                 n = reg_list.n;
 932                 reg_list.n = kvm_arm_num_regs(vcpu);
 933                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 934                         return -EFAULT;
 935                 if (n < reg_list.n)
 936                         return -E2BIG;
 937                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 938         }
 939         case KVM_SET_DEVICE_ATTR: {
 940                 if (copy_from_user(&attr, argp, sizeof(attr)))
 941                         return -EFAULT;
 942                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 943         }
 944         case KVM_GET_DEVICE_ATTR: {
 945                 if (copy_from_user(&attr, argp, sizeof(attr)))
 946                         return -EFAULT;
 947                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 948         }
 949         case KVM_HAS_DEVICE_ATTR: {
 950                 if (copy_from_user(&attr, argp, sizeof(attr)))
 951                         return -EFAULT;
 952                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 953         }
 954         default:
 955                 return -EINVAL;
 956         }
 957 }
 958
 959 /**
 960  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 961  * @kvm: kvm instance
 962  * @log: slot id and address to which we copy the log
 963  *
 964  * Steps 1-4 below provide general overview of dirty page logging. See
 965  * kvm_get_dirty_log_protect() function description for additional details.
 966  *
 967  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 968  * always flush the TLB (step 4) even if previous step failed  and the dirty
 969  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 970  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 971  * writes will be marked dirty for next log read.
 972  *
 973  *   1. Take a snapshot of the bit and clear it if needed.
 974  *   2. Write protect the corresponding page.
 975  *   3. Copy the snapshot to the userspace.
 976  *   4. Flush TLB's if needed.
 977  */
 978 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 979 {
 980         bool is_dirty = false;
 981         int r;
 982
 983         mutex_lock(&kvm->slots_lock);
 984
 985         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 986
 987         if (is_dirty)
 988                 kvm_flush_remote_tlbs(kvm);
 989
 990         mutex_unlock(&kvm->slots_lock);
 991         return r;
 992 }
 993
 994 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 995                                         struct kvm_arm_device_addr *dev_addr)
 996 {
 997         unsigned long dev_id, type;
 998
 999         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1000                 KVM_ARM_DEVICE_ID_SHIFT;
1001         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1002                 KVM_ARM_DEVICE_TYPE_SHIFT;
1003
1004         switch (dev_id) {
1005         case KVM_ARM_DEVICE_VGIC_V2:
1006                 if (!vgic_present)
1007                         return -ENXIO;
1008                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1009         default:
1010                 return -ENODEV;
1011         }
1012 }
1013
1014 long kvm_arch_vm_ioctl(struct file *filp,
1015                        unsigned int ioctl, unsigned long arg)
1016 {
1017         struct kvm *kvm = filp->private_data;
1018         void __user *argp = (void __user *)arg;
1019
1020         switch (ioctl) {
1021         case KVM_CREATE_IRQCHIP: {
1022                 int ret;
1023                 if (!vgic_present)
1024                         return -ENXIO;
1025                 mutex_lock(&kvm->lock);
1026                 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1027                 mutex_unlock(&kvm->lock);
1028                 return ret;
1029         }
1030         case KVM_ARM_SET_DEVICE_ADDR: {
1031                 struct kvm_arm_device_addr dev_addr;
1032
1033                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1034                         return -EFAULT;
1035                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1036         }
1037         case KVM_ARM_PREFERRED_TARGET: {
1038                 int err;
1039                 struct kvm_vcpu_init init;
1040
1041                 err = kvm_vcpu_preferred_target(&init);
1042                 if (err)
1043                         return err;
1044
1045                 if (copy_to_user(argp, &init, sizeof(init)))
1046                         return -EFAULT;
1047
1048                 return 0;
1049         }
1050         default:
1051                 return -EINVAL;
1052         }
1053 }
1054
1055 static void cpu_init_hyp_mode(void *dummy)
1056 {
1057         phys_addr_t pgd_ptr;
1058         unsigned long hyp_stack_ptr;
1059         unsigned long stack_page;
1060         unsigned long vector_ptr;
1061
1062         /* Switch from the HYP stub to our own HYP init vector */
1063         __hyp_set_vectors(kvm_get_idmap_vector());
1064
1065         pgd_ptr = kvm_mmu_get_httbr();
1066         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1067         hyp_stack_ptr = stack_page + PAGE_SIZE;
1068         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1069
1070         __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1071         __cpu_init_stage2();
1072
1073         kvm_arm_init_debug();
1074 }
1075
1076 static void cpu_hyp_reinit(void)
1077 {
1078         if (is_kernel_in_hyp_mode()) {
1079                 /*
1080                  * __cpu_init_stage2() is safe to call even if the PM
1081                  * event was cancelled before the CPU was reset.
1082                  */
1083                 __cpu_init_stage2();
1084         } else {
1085                 if (__hyp_get_vectors() == hyp_default_vectors)
1086                         cpu_init_hyp_mode(NULL);
1087         }
1088 }
1089
1090 static void cpu_hyp_reset(void)
1091 {
1092         if (!is_kernel_in_hyp_mode())
1093                 __cpu_reset_hyp_mode(hyp_default_vectors,
1094                                      kvm_get_idmap_start());
1095 }
1096
1097 static void _kvm_arch_hardware_enable(void *discard)
1098 {
1099         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1100                 cpu_hyp_reinit();
1101                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1102         }
1103 }
1104
1105 int kvm_arch_hardware_enable(void)
1106 {
1107         _kvm_arch_hardware_enable(NULL);
1108         return 0;
1109 }
1110
1111 static void _kvm_arch_hardware_disable(void *discard)
1112 {
1113         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1114                 cpu_hyp_reset();
1115                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1116         }
1117 }
1118
1119 void kvm_arch_hardware_disable(void)
1120 {
1121         _kvm_arch_hardware_disable(NULL);
1122 }
1123
1124 #ifdef CONFIG_CPU_PM
1125 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1126                                     unsigned long cmd,
1127                                     void *v)
1128 {
1129         /*
1130          * kvm_arm_hardware_enabled is left with its old value over
1131          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1132          * re-enable hyp.
1133          */
1134         switch (cmd) {
1135         case CPU_PM_ENTER:
1136                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1137                         /*
1138                          * don't update kvm_arm_hardware_enabled here
1139                          * so that the hardware will be re-enabled
1140                          * when we resume. See below.
1141                          */
1142                         cpu_hyp_reset();
1143
1144                 return NOTIFY_OK;
1145         case CPU_PM_EXIT:
1146                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1147                         /* The hardware was enabled before suspend. */
1148                         cpu_hyp_reinit();
1149
1150                 return NOTIFY_OK;
1151
1152         default:
1153                 return NOTIFY_DONE;
1154         }
1155 }
1156
1157 static struct notifier_block hyp_init_cpu_pm_nb = {
1158         .notifier_call = hyp_init_cpu_pm_notifier,
1159 };
1160
1161 static void __init hyp_cpu_pm_init(void)
1162 {
1163         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1164 }
1165 static void __init hyp_cpu_pm_exit(void)
1166 {
1167         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1168 }
1169 #else
1170 static inline void hyp_cpu_pm_init(void)
1171 {
1172 }
1173 static inline void hyp_cpu_pm_exit(void)
1174 {
1175 }
1176 #endif
1177
1178 static void teardown_common_resources(void)
1179 {
1180         free_percpu(kvm_host_cpu_state);
1181 }
1182
1183 static int init_common_resources(void)
1184 {
1185         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1186         if (!kvm_host_cpu_state) {
1187                 kvm_err("Cannot allocate host CPU state\n");
1188                 return -ENOMEM;
1189         }
1190
1191         /* set size of VMID supported by CPU */
1192         kvm_vmid_bits = kvm_get_vmid_bits();
1193         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1194
1195         return 0;
1196 }
1197
1198 static int init_subsystems(void)
1199 {
1200         int err = 0;
1201
1202         /*
1203          * Enable hardware so that subsystem initialisation can access EL2.
1204          */
1205         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1206
1207         /*
1208          * Register CPU lower-power notifier
1209          */
1210         hyp_cpu_pm_init();
1211
1212         /*
1213          * Init HYP view of VGIC
1214          */
1215         err = kvm_vgic_hyp_init();
1216         switch (err) {
1217         case 0:
1218                 vgic_present = true;
1219                 break;
1220         case -ENODEV:
1221         case -ENXIO:
1222                 vgic_present = false;
1223                 err = 0;
1224                 break;
1225         default:
1226                 goto out;
1227         }
1228
1229         /*
1230          * Init HYP architected timer support
1231          */
1232         err = kvm_timer_hyp_init();
1233         if (err)
1234                 goto out;
1235
1236         kvm_perf_init();
1237         kvm_coproc_table_init();
1238
1239 out:
1240         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1241
1242         return err;
1243 }
1244
1245 static void teardown_hyp_mode(void)
1246 {
1247         int cpu;
1248
1249         if (is_kernel_in_hyp_mode())
1250                 return;
1251
1252         free_hyp_pgds();
1253         for_each_possible_cpu(cpu)
1254                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1255         hyp_cpu_pm_exit();
1256 }
1257
1258 static int init_vhe_mode(void)
1259 {
1260         kvm_info("VHE mode initialized successfully\n");
1261         return 0;
1262 }
1263
1264 /**
1265  * Inits Hyp-mode on all online CPUs
1266  */
1267 static int init_hyp_mode(void)
1268 {
1269         int cpu;
1270         int err = 0;
1271
1272         /*
1273          * Allocate Hyp PGD and setup Hyp identity mapping
1274          */
1275         err = kvm_mmu_init();
1276         if (err)
1277                 goto out_err;
1278
1279         /*
1280          * It is probably enough to obtain the default on one
1281          * CPU. It's unlikely to be different on the others.
1282          */
1283         hyp_default_vectors = __hyp_get_vectors();
1284
1285         /*
1286          * Allocate stack pages for Hypervisor-mode
1287          */
1288         for_each_possible_cpu(cpu) {
1289                 unsigned long stack_page;
1290
1291                 stack_page = __get_free_page(GFP_KERNEL);
1292                 if (!stack_page) {
1293                         err = -ENOMEM;
1294                         goto out_err;
1295                 }
1296
1297                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1298         }
1299
1300         /*
1301          * Map the Hyp-code called directly from the host
1302          */
1303         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1304                                   kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1305         if (err) {
1306                 kvm_err("Cannot map world-switch code\n");
1307                 goto out_err;
1308         }
1309
1310         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1311                                   kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1312         if (err) {
1313                 kvm_err("Cannot map rodata section\n");
1314                 goto out_err;
1315         }
1316
1317         /*
1318          * Map the Hyp stack pages
1319          */
1320         for_each_possible_cpu(cpu) {
1321                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1322                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1323                                           PAGE_HYP);
1324
1325                 if (err) {
1326                         kvm_err("Cannot map hyp stack\n");
1327                         goto out_err;
1328                 }
1329         }
1330
1331         for_each_possible_cpu(cpu) {
1332                 kvm_cpu_context_t *cpu_ctxt;
1333
1334                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1335                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1336
1337                 if (err) {
1338                         kvm_err("Cannot map host CPU state: %d\n", err);
1339                         goto out_err;
1340                 }
1341         }
1342
1343         kvm_info("Hyp mode initialized successfully\n");
1344
1345         return 0;
1346
1347 out_err:
1348         teardown_hyp_mode();
1349         kvm_err("error initializing Hyp mode: %d\n", err);
1350         return err;
1351 }
1352
1353 static void check_kvm_target_cpu(void *ret)
1354 {
1355         *(int *)ret = kvm_target_cpu();
1356 }
1357
1358 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1359 {
1360         struct kvm_vcpu *vcpu;
1361         int i;
1362
1363         mpidr &= MPIDR_HWID_BITMASK;
1364         kvm_for_each_vcpu(i, vcpu, kvm) {
1365                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1366                         return vcpu;
1367         }
1368         return NULL;
1369 }
1370
1371 /**
1372  * Initialize Hyp-mode and memory mappings on all CPUs.
1373  */
1374 int kvm_arch_init(void *opaque)
1375 {
1376         int err;
1377         int ret, cpu;
1378
1379         if (!is_hyp_mode_available()) {
1380                 kvm_err("HYP mode not available\n");
1381                 return -ENODEV;
1382         }
1383
1384         for_each_online_cpu(cpu) {
1385                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1386                 if (ret < 0) {
1387                         kvm_err("Error, CPU %d not supported!\n", cpu);
1388                         return -ENODEV;
1389                 }
1390         }
1391
1392         err = init_common_resources();
1393         if (err)
1394                 return err;
1395
1396         if (is_kernel_in_hyp_mode())
1397                 err = init_vhe_mode();
1398         else
1399                 err = init_hyp_mode();
1400         if (err)
1401                 goto out_err;
1402
1403         err = init_subsystems();
1404         if (err)
1405                 goto out_hyp;
1406
1407         return 0;
1408
1409 out_hyp:
1410         teardown_hyp_mode();
1411 out_err:
1412         teardown_common_resources();
1413         return err;
1414 }
1415
1416 /* NOP: Compiling as a module not supported */
1417 void kvm_arch_exit(void)
1418 {
1419         kvm_perf_teardown();
1420 }
1421
1422 static int arm_init(void)
1423 {
1424         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1425         return rc;
1426 }
1427
1428 module_init(arm_init);