arch/arm/kvm/arm.c

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <linux/cpu.h>
  20 #include <linux/cpu_pm.h>
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.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 void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  70 {
  71         BUG_ON(preemptible());
  72         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  73 }
  74
  75 /**
  76  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  77  * Must be called from non-preemptible context
  78  */
  79 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  80 {
  81         BUG_ON(preemptible());
  82         return __this_cpu_read(kvm_arm_running_vcpu);
  83 }
  84
  85 /**
  86  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  87  */
  88 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
  89 {
  90         return &kvm_arm_running_vcpu;
  91 }
  92
  93 int kvm_arch_hardware_enable(void)
  94 {
  95         return 0;
  96 }
  97
  98 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  99 {
 100         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
 101 }
 102
 103 int kvm_arch_hardware_setup(void)
 104 {
 105         return 0;
 106 }
 107
 108 void kvm_arch_check_processor_compat(void *rtn)
 109 {
 110         *(int *)rtn = 0;
 111 }
 112
 113
 114 /**
 115  * kvm_arch_init_vm - initializes a VM data structure
 116  * @kvm:        pointer to the KVM struct
 117  */
 118 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 119 {
 120         int ret = 0;
 121
 122         if (type)
 123                 return -EINVAL;
 124
 125         ret = kvm_alloc_stage2_pgd(kvm);
 126         if (ret)
 127                 goto out_fail_alloc;
 128
 129         ret = create_hyp_mappings(kvm, kvm + 1);
 130         if (ret)
 131                 goto out_free_stage2_pgd;
 132
 133         kvm_vgic_early_init(kvm);
 134         kvm_timer_init(kvm);
 135
 136         /* Mark the initial VMID generation invalid */
 137         kvm->arch.vmid_gen = 0;
 138
 139         /* The maximum number of VCPUs is limited by the host's GIC model */
 140         kvm->arch.max_vcpus = vgic_present ?
 141                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 142
 143         return ret;
 144 out_free_stage2_pgd:
 145         kvm_free_stage2_pgd(kvm);
 146 out_fail_alloc:
 147         return ret;
 148 }
 149
 150 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 151 {
 152         return VM_FAULT_SIGBUS;
 153 }
 154
 155
 156 /**
 157  * kvm_arch_destroy_vm - destroy the VM data structure
 158  * @kvm:        pointer to the KVM struct
 159  */
 160 void kvm_arch_destroy_vm(struct kvm *kvm)
 161 {
 162         int i;
 163
 164         kvm_free_stage2_pgd(kvm);
 165
 166         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 167                 if (kvm->vcpus[i]) {
 168                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 169                         kvm->vcpus[i] = NULL;
 170                 }
 171         }
 172
 173         kvm_vgic_destroy(kvm);
 174 }
 175
 176 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 177 {
 178         int r;
 179         switch (ext) {
 180         case KVM_CAP_IRQCHIP:
 181                 r = vgic_present;
 182                 break;
 183         case KVM_CAP_IOEVENTFD:
 184         case KVM_CAP_DEVICE_CTRL:
 185         case KVM_CAP_USER_MEMORY:
 186         case KVM_CAP_SYNC_MMU:
 187         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 188         case KVM_CAP_ONE_REG:
 189         case KVM_CAP_ARM_PSCI:
 190         case KVM_CAP_ARM_PSCI_0_2:
 191         case KVM_CAP_READONLY_MEM:
 192         case KVM_CAP_MP_STATE:
 193                 r = 1;
 194                 break;
 195         case KVM_CAP_COALESCED_MMIO:
 196                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 197                 break;
 198         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 199                 r = 1;
 200                 break;
 201         case KVM_CAP_NR_VCPUS:
 202                 r = num_online_cpus();
 203                 break;
 204         case KVM_CAP_MAX_VCPUS:
 205                 r = KVM_MAX_VCPUS;
 206                 break;
 207         default:
 208                 r = kvm_arch_dev_ioctl_check_extension(ext);
 209                 break;
 210         }
 211         return r;
 212 }
 213
 214 long kvm_arch_dev_ioctl(struct file *filp,
 215                         unsigned int ioctl, unsigned long arg)
 216 {
 217         return -EINVAL;
 218 }
 219
 220
 221 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 222 {
 223         int err;
 224         struct kvm_vcpu *vcpu;
 225
 226         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 227                 err = -EBUSY;
 228                 goto out;
 229         }
 230
 231         if (id >= kvm->arch.max_vcpus) {
 232                 err = -EINVAL;
 233                 goto out;
 234         }
 235
 236         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 237         if (!vcpu) {
 238                 err = -ENOMEM;
 239                 goto out;
 240         }
 241
 242         err = kvm_vcpu_init(vcpu, kvm, id);
 243         if (err)
 244                 goto free_vcpu;
 245
 246         err = create_hyp_mappings(vcpu, vcpu + 1);
 247         if (err)
 248                 goto vcpu_uninit;
 249
 250         return vcpu;
 251 vcpu_uninit:
 252         kvm_vcpu_uninit(vcpu);
 253 free_vcpu:
 254         kmem_cache_free(kvm_vcpu_cache, vcpu);
 255 out:
 256         return ERR_PTR(err);
 257 }
 258
 259 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 260 {
 261         kvm_vgic_vcpu_early_init(vcpu);
 262 }
 263
 264 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 265 {
 266         kvm_mmu_free_memory_caches(vcpu);
 267         kvm_timer_vcpu_terminate(vcpu);
 268         kvm_vgic_vcpu_destroy(vcpu);
 269         kvm_pmu_vcpu_destroy(vcpu);
 270         kmem_cache_free(kvm_vcpu_cache, vcpu);
 271 }
 272
 273 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 274 {
 275         kvm_arch_vcpu_free(vcpu);
 276 }
 277
 278 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 279 {
 280         return kvm_timer_should_fire(vcpu);
 281 }
 282
 283 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 284 {
 285         kvm_timer_schedule(vcpu);
 286 }
 287
 288 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 289 {
 290         kvm_timer_unschedule(vcpu);
 291 }
 292
 293 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 294 {
 295         /* Force users to call KVM_ARM_VCPU_INIT */
 296         vcpu->arch.target = -1;
 297         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 298
 299         /* Set up the timer */
 300         kvm_timer_vcpu_init(vcpu);
 301
 302         kvm_arm_reset_debug_ptr(vcpu);
 303
 304         return 0;
 305 }
 306
 307 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 308 {
 309         vcpu->cpu = cpu;
 310         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 311
 312         kvm_arm_set_running_vcpu(vcpu);
 313 }
 314
 315 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 316 {
 317         /*
 318          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 319          * if the vcpu is no longer assigned to a cpu.  This is used for the
 320          * optimized make_all_cpus_request path.
 321          */
 322         vcpu->cpu = -1;
 323
 324         kvm_arm_set_running_vcpu(NULL);
 325         kvm_timer_vcpu_put(vcpu);
 326 }
 327
 328 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 329                                     struct kvm_mp_state *mp_state)
 330 {
 331         if (vcpu->arch.power_off)
 332                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 333         else
 334                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 335
 336         return 0;
 337 }
 338
 339 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 340                                     struct kvm_mp_state *mp_state)
 341 {
 342         switch (mp_state->mp_state) {
 343         case KVM_MP_STATE_RUNNABLE:
 344                 vcpu->arch.power_off = false;
 345                 break;
 346         case KVM_MP_STATE_STOPPED:
 347                 vcpu->arch.power_off = true;
 348                 break;
 349         default:
 350                 return -EINVAL;
 351         }
 352
 353         return 0;
 354 }
 355
 356 /**
 357  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 358  * @v:          The VCPU pointer
 359  *
 360  * If the guest CPU is not waiting for interrupts or an interrupt line is
 361  * asserted, the CPU is by definition runnable.
 362  */
 363 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 364 {
 365         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 366                 && !v->arch.power_off && !v->arch.pause);
 367 }
 368
 369 /* Just ensure a guest exit from a particular CPU */
 370 static void exit_vm_noop(void *info)
 371 {
 372 }
 373
 374 void force_vm_exit(const cpumask_t *mask)
 375 {
 376         preempt_disable();
 377         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 378         preempt_enable();
 379 }
 380
 381 /**
 382  * need_new_vmid_gen - check that the VMID is still valid
 383  * @kvm: The VM's VMID to checkt
 384  *
 385  * return true if there is a new generation of VMIDs being used
 386  *
 387  * The hardware supports only 256 values with the value zero reserved for the
 388  * host, so we check if an assigned value belongs to a previous generation,
 389  * which which requires us to assign a new value. If we're the first to use a
 390  * VMID for the new generation, we must flush necessary caches and TLBs on all
 391  * CPUs.
 392  */
 393 static bool need_new_vmid_gen(struct kvm *kvm)
 394 {
 395         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 396 }
 397
 398 /**
 399  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 400  * @kvm The guest that we are about to run
 401  *
 402  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 403  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 404  * caches and TLBs.
 405  */
 406 static void update_vttbr(struct kvm *kvm)
 407 {
 408         phys_addr_t pgd_phys;
 409         u64 vmid;
 410
 411         if (!need_new_vmid_gen(kvm))
 412                 return;
 413
 414         spin_lock(&kvm_vmid_lock);
 415
 416         /*
 417          * We need to re-check the vmid_gen here to ensure that if another vcpu
 418          * already allocated a valid vmid for this vm, then this vcpu should
 419          * use the same vmid.
 420          */
 421         if (!need_new_vmid_gen(kvm)) {
 422                 spin_unlock(&kvm_vmid_lock);
 423                 return;
 424         }
 425
 426         /* First user of a new VMID generation? */
 427         if (unlikely(kvm_next_vmid == 0)) {
 428                 atomic64_inc(&kvm_vmid_gen);
 429                 kvm_next_vmid = 1;
 430
 431                 /*
 432                  * On SMP we know no other CPUs can use this CPU's or each
 433                  * other's VMID after force_vm_exit returns since the
 434                  * kvm_vmid_lock blocks them from reentry to the guest.
 435                  */
 436                 force_vm_exit(cpu_all_mask);
 437                 /*
 438                  * Now broadcast TLB + ICACHE invalidation over the inner
 439                  * shareable domain to make sure all data structures are
 440                  * clean.
 441                  */
 442                 kvm_call_hyp(__kvm_flush_vm_context);
 443         }
 444
 445         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 446         kvm->arch.vmid = kvm_next_vmid;
 447         kvm_next_vmid++;
 448         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 449
 450         /* update vttbr to be used with the new vmid */
 451         pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
 452         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 453         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 454         kvm->arch.vttbr = pgd_phys | vmid;
 455
 456         spin_unlock(&kvm_vmid_lock);
 457 }
 458
 459 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 460 {
 461         struct kvm *kvm = vcpu->kvm;
 462         int ret;
 463
 464         if (likely(vcpu->arch.has_run_once))
 465                 return 0;
 466
 467         vcpu->arch.has_run_once = true;
 468
 469         /*
 470          * Map the VGIC hardware resources before running a vcpu the first
 471          * time on this VM.
 472          */
 473         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 474                 ret = kvm_vgic_map_resources(kvm);
 475                 if (ret)
 476                         return ret;
 477         }
 478
 479         /*
 480          * Enable the arch timers only if we have an in-kernel VGIC
 481          * and it has been properly initialized, since we cannot handle
 482          * interrupts from the virtual timer with a userspace gic.
 483          */
 484         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 485                 kvm_timer_enable(kvm);
 486
 487         return 0;
 488 }
 489
 490 bool kvm_arch_intc_initialized(struct kvm *kvm)
 491 {
 492         return vgic_initialized(kvm);
 493 }
 494
 495 static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused;
 496 static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused;
 497
 498 static void kvm_arm_halt_guest(struct kvm *kvm)
 499 {
 500         int i;
 501         struct kvm_vcpu *vcpu;
 502
 503         kvm_for_each_vcpu(i, vcpu, kvm)
 504                 vcpu->arch.pause = true;
 505         force_vm_exit(cpu_all_mask);
 506 }
 507
 508 static void kvm_arm_resume_guest(struct kvm *kvm)
 509 {
 510         int i;
 511         struct kvm_vcpu *vcpu;
 512
 513         kvm_for_each_vcpu(i, vcpu, kvm) {
 514                 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 515
 516                 vcpu->arch.pause = false;
 517                 swake_up(wq);
 518         }
 519 }
 520
 521 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 522 {
 523         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 524
 525         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 526                                        (!vcpu->arch.pause)));
 527 }
 528
 529 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 530 {
 531         return vcpu->arch.target >= 0;
 532 }
 533
 534 /**
 535  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 536  * @vcpu:       The VCPU pointer
 537  * @run:        The kvm_run structure pointer used for userspace state exchange
 538  *
 539  * This function is called through the VCPU_RUN ioctl called from user space. It
 540  * will execute VM code in a loop until the time slice for the process is used
 541  * or some emulation is needed from user space in which case the function will
 542  * return with return value 0 and with the kvm_run structure filled in with the
 543  * required data for the requested emulation.
 544  */
 545 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 546 {
 547         int ret;
 548         sigset_t sigsaved;
 549
 550         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 551                 return -ENOEXEC;
 552
 553         ret = kvm_vcpu_first_run_init(vcpu);
 554         if (ret)
 555                 return ret;
 556
 557         if (run->exit_reason == KVM_EXIT_MMIO) {
 558                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 559                 if (ret)
 560                         return ret;
 561         }
 562
 563         if (vcpu->sigset_active)
 564                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 565
 566         ret = 1;
 567         run->exit_reason = KVM_EXIT_UNKNOWN;
 568         while (ret > 0) {
 569                 /*
 570                  * Check conditions before entering the guest
 571                  */
 572                 cond_resched();
 573
 574                 update_vttbr(vcpu->kvm);
 575
 576                 if (vcpu->arch.power_off || vcpu->arch.pause)
 577                         vcpu_sleep(vcpu);
 578
 579                 /*
 580                  * Preparing the interrupts to be injected also
 581                  * involves poking the GIC, which must be done in a
 582                  * non-preemptible context.
 583                  */
 584                 preempt_disable();
 585                 kvm_pmu_flush_hwstate(vcpu);
 586                 kvm_timer_flush_hwstate(vcpu);
 587                 kvm_vgic_flush_hwstate(vcpu);
 588
 589                 local_irq_disable();
 590
 591                 /*
 592                  * Re-check atomic conditions
 593                  */
 594                 if (signal_pending(current)) {
 595                         ret = -EINTR;
 596                         run->exit_reason = KVM_EXIT_INTR;
 597                 }
 598
 599                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 600                         vcpu->arch.power_off || vcpu->arch.pause) {
 601                         local_irq_enable();
 602                         kvm_pmu_sync_hwstate(vcpu);
 603                         kvm_timer_sync_hwstate(vcpu);
 604                         kvm_vgic_sync_hwstate(vcpu);
 605                         preempt_enable();
 606                         continue;
 607                 }
 608
 609                 kvm_arm_setup_debug(vcpu);
 610
 611                 /**************************************************************
 612                  * Enter the guest
 613                  */
 614                 trace_kvm_entry(*vcpu_pc(vcpu));
 615                 __kvm_guest_enter();
 616                 vcpu->mode = IN_GUEST_MODE;
 617
 618                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 619
 620                 vcpu->mode = OUTSIDE_GUEST_MODE;
 621                 vcpu->stat.exits++;
 622                 /*
 623                  * Back from guest
 624                  *************************************************************/
 625
 626                 kvm_arm_clear_debug(vcpu);
 627
 628                 /*
 629                  * We may have taken a host interrupt in HYP mode (ie
 630                  * while executing the guest). This interrupt is still
 631                  * pending, as we haven't serviced it yet!
 632                  *
 633                  * We're now back in SVC mode, with interrupts
 634                  * disabled.  Enabling the interrupts now will have
 635                  * the effect of taking the interrupt again, in SVC
 636                  * mode this time.
 637                  */
 638                 local_irq_enable();
 639
 640                 /*
 641                  * We do local_irq_enable() before calling kvm_guest_exit() so
 642                  * that if a timer interrupt hits while running the guest we
 643                  * account that tick as being spent in the guest.  We enable
 644                  * preemption after calling kvm_guest_exit() so that if we get
 645                  * preempted we make sure ticks after that is not counted as
 646                  * guest time.
 647                  */
 648                 kvm_guest_exit();
 649                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 650
 651                 /*
 652                  * We must sync the PMU and timer state before the vgic state so
 653                  * that the vgic can properly sample the updated state of the
 654                  * interrupt line.
 655                  */
 656                 kvm_pmu_sync_hwstate(vcpu);
 657                 kvm_timer_sync_hwstate(vcpu);
 658
 659                 kvm_vgic_sync_hwstate(vcpu);
 660
 661                 preempt_enable();
 662
 663                 ret = handle_exit(vcpu, run, ret);
 664         }
 665
 666         if (vcpu->sigset_active)
 667                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 668         return ret;
 669 }
 670
 671 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 672 {
 673         int bit_index;
 674         bool set;
 675         unsigned long *ptr;
 676
 677         if (number == KVM_ARM_IRQ_CPU_IRQ)
 678                 bit_index = __ffs(HCR_VI);
 679         else /* KVM_ARM_IRQ_CPU_FIQ */
 680                 bit_index = __ffs(HCR_VF);
 681
 682         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 683         if (level)
 684                 set = test_and_set_bit(bit_index, ptr);
 685         else
 686                 set = test_and_clear_bit(bit_index, ptr);
 687
 688         /*
 689          * If we didn't change anything, no need to wake up or kick other CPUs
 690          */
 691         if (set == level)
 692                 return 0;
 693
 694         /*
 695          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 696          * trigger a world-switch round on the running physical CPU to set the
 697          * virtual IRQ/FIQ fields in the HCR appropriately.
 698          */
 699         kvm_vcpu_kick(vcpu);
 700
 701         return 0;
 702 }
 703
 704 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 705                           bool line_status)
 706 {
 707         u32 irq = irq_level->irq;
 708         unsigned int irq_type, vcpu_idx, irq_num;
 709         int nrcpus = atomic_read(&kvm->online_vcpus);
 710         struct kvm_vcpu *vcpu = NULL;
 711         bool level = irq_level->level;
 712
 713         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 714         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 715         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 716
 717         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 718
 719         switch (irq_type) {
 720         case KVM_ARM_IRQ_TYPE_CPU:
 721                 if (irqchip_in_kernel(kvm))
 722                         return -ENXIO;
 723
 724                 if (vcpu_idx >= nrcpus)
 725                         return -EINVAL;
 726
 727                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 728                 if (!vcpu)
 729                         return -EINVAL;
 730
 731                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 732                         return -EINVAL;
 733
 734                 return vcpu_interrupt_line(vcpu, irq_num, level);
 735         case KVM_ARM_IRQ_TYPE_PPI:
 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 < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 747                         return -EINVAL;
 748
 749                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 750         case KVM_ARM_IRQ_TYPE_SPI:
 751                 if (!irqchip_in_kernel(kvm))
 752                         return -ENXIO;
 753
 754                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 755                         return -EINVAL;
 756
 757                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 758         }
 759
 760         return -EINVAL;
 761 }
 762
 763 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 764                                const struct kvm_vcpu_init *init)
 765 {
 766         unsigned int i;
 767         int phys_target = kvm_target_cpu();
 768
 769         if (init->target != phys_target)
 770                 return -EINVAL;
 771
 772         /*
 773          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 774          * use the same target.
 775          */
 776         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 777                 return -EINVAL;
 778
 779         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 780         for (i = 0; i < sizeof(init->features) * 8; i++) {
 781                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 782
 783                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 784                         return -ENOENT;
 785
 786                 /*
 787                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 788                  * use the same feature set.
 789                  */
 790                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 791                     test_bit(i, vcpu->arch.features) != set)
 792                         return -EINVAL;
 793
 794                 if (set)
 795                         set_bit(i, vcpu->arch.features);
 796         }
 797
 798         vcpu->arch.target = phys_target;
 799
 800         /* Now we know what it is, we can reset it. */
 801         return kvm_reset_vcpu(vcpu);
 802 }
 803
 804
 805 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 806                                          struct kvm_vcpu_init *init)
 807 {
 808         int ret;
 809
 810         ret = kvm_vcpu_set_target(vcpu, init);
 811         if (ret)
 812                 return ret;
 813
 814         /*
 815          * Ensure a rebooted VM will fault in RAM pages and detect if the
 816          * guest MMU is turned off and flush the caches as needed.
 817          */
 818         if (vcpu->arch.has_run_once)
 819                 stage2_unmap_vm(vcpu->kvm);
 820
 821         vcpu_reset_hcr(vcpu);
 822
 823         /*
 824          * Handle the "start in power-off" case.
 825          */
 826         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 827                 vcpu->arch.power_off = true;
 828         else
 829                 vcpu->arch.power_off = false;
 830
 831         return 0;
 832 }
 833
 834 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 835                                  struct kvm_device_attr *attr)
 836 {
 837         int ret = -ENXIO;
 838
 839         switch (attr->group) {
 840         default:
 841                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 842                 break;
 843         }
 844
 845         return ret;
 846 }
 847
 848 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 849                                  struct kvm_device_attr *attr)
 850 {
 851         int ret = -ENXIO;
 852
 853         switch (attr->group) {
 854         default:
 855                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 856                 break;
 857         }
 858
 859         return ret;
 860 }
 861
 862 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 863                                  struct kvm_device_attr *attr)
 864 {
 865         int ret = -ENXIO;
 866
 867         switch (attr->group) {
 868         default:
 869                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 870                 break;
 871         }
 872
 873         return ret;
 874 }
 875
 876 long kvm_arch_vcpu_ioctl(struct file *filp,
 877                          unsigned int ioctl, unsigned long arg)
 878 {
 879         struct kvm_vcpu *vcpu = filp->private_data;
 880         void __user *argp = (void __user *)arg;
 881         struct kvm_device_attr attr;
 882
 883         switch (ioctl) {
 884         case KVM_ARM_VCPU_INIT: {
 885                 struct kvm_vcpu_init init;
 886
 887                 if (copy_from_user(&init, argp, sizeof(init)))
 888                         return -EFAULT;
 889
 890                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 891         }
 892         case KVM_SET_ONE_REG:
 893         case KVM_GET_ONE_REG: {
 894                 struct kvm_one_reg reg;
 895
 896                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 897                         return -ENOEXEC;
 898
 899                 if (copy_from_user(&reg, argp, sizeof(reg)))
 900                         return -EFAULT;
 901                 if (ioctl == KVM_SET_ONE_REG)
 902                         return kvm_arm_set_reg(vcpu, &reg);
 903                 else
 904                         return kvm_arm_get_reg(vcpu, &reg);
 905         }
 906         case KVM_GET_REG_LIST: {
 907                 struct kvm_reg_list __user *user_list = argp;
 908                 struct kvm_reg_list reg_list;
 909                 unsigned n;
 910
 911                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 912                         return -ENOEXEC;
 913
 914                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 915                         return -EFAULT;
 916                 n = reg_list.n;
 917                 reg_list.n = kvm_arm_num_regs(vcpu);
 918                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 919                         return -EFAULT;
 920                 if (n < reg_list.n)
 921                         return -E2BIG;
 922                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 923         }
 924         case KVM_SET_DEVICE_ATTR: {
 925                 if (copy_from_user(&attr, argp, sizeof(attr)))
 926                         return -EFAULT;
 927                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 928         }
 929         case KVM_GET_DEVICE_ATTR: {
 930                 if (copy_from_user(&attr, argp, sizeof(attr)))
 931                         return -EFAULT;
 932                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 933         }
 934         case KVM_HAS_DEVICE_ATTR: {
 935                 if (copy_from_user(&attr, argp, sizeof(attr)))
 936                         return -EFAULT;
 937                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 938         }
 939         default:
 940                 return -EINVAL;
 941         }
 942 }
 943
 944 /**
 945  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 946  * @kvm: kvm instance
 947  * @log: slot id and address to which we copy the log
 948  *
 949  * Steps 1-4 below provide general overview of dirty page logging. See
 950  * kvm_get_dirty_log_protect() function description for additional details.
 951  *
 952  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 953  * always flush the TLB (step 4) even if previous step failed  and the dirty
 954  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 955  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 956  * writes will be marked dirty for next log read.
 957  *
 958  *   1. Take a snapshot of the bit and clear it if needed.
 959  *   2. Write protect the corresponding page.
 960  *   3. Copy the snapshot to the userspace.
 961  *   4. Flush TLB's if needed.
 962  */
 963 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 964 {
 965         bool is_dirty = false;
 966         int r;
 967
 968         mutex_lock(&kvm->slots_lock);
 969
 970         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 971
 972         if (is_dirty)
 973                 kvm_flush_remote_tlbs(kvm);
 974
 975         mutex_unlock(&kvm->slots_lock);
 976         return r;
 977 }
 978
 979 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 980                                         struct kvm_arm_device_addr *dev_addr)
 981 {
 982         unsigned long dev_id, type;
 983
 984         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 985                 KVM_ARM_DEVICE_ID_SHIFT;
 986         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 987                 KVM_ARM_DEVICE_TYPE_SHIFT;
 988
 989         switch (dev_id) {
 990         case KVM_ARM_DEVICE_VGIC_V2:
 991                 if (!vgic_present)
 992                         return -ENXIO;
 993                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
 994         default:
 995                 return -ENODEV;
 996         }
 997 }
 998
 999 long kvm_arch_vm_ioctl(struct file *filp,
1000                        unsigned int ioctl, unsigned long arg)
1001 {
1002         struct kvm *kvm = filp->private_data;
1003         void __user *argp = (void __user *)arg;
1004
1005         switch (ioctl) {
1006         case KVM_CREATE_IRQCHIP: {
1007                 if (!vgic_present)
1008                         return -ENXIO;
1009                 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1010         }
1011         case KVM_ARM_SET_DEVICE_ADDR: {
1012                 struct kvm_arm_device_addr dev_addr;
1013
1014                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1015                         return -EFAULT;
1016                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1017         }
1018         case KVM_ARM_PREFERRED_TARGET: {
1019                 int err;
1020                 struct kvm_vcpu_init init;
1021
1022                 err = kvm_vcpu_preferred_target(&init);
1023                 if (err)
1024                         return err;
1025
1026                 if (copy_to_user(argp, &init, sizeof(init)))
1027                         return -EFAULT;
1028
1029                 return 0;
1030         }
1031         default:
1032                 return -EINVAL;
1033         }
1034 }
1035
1036 static void cpu_init_stage2(void *dummy)
1037 {
1038         __cpu_init_stage2();
1039 }
1040
1041 static void cpu_init_hyp_mode(void *dummy)
1042 {
1043         phys_addr_t boot_pgd_ptr;
1044         phys_addr_t pgd_ptr;
1045         unsigned long hyp_stack_ptr;
1046         unsigned long stack_page;
1047         unsigned long vector_ptr;
1048
1049         /* Switch from the HYP stub to our own HYP init vector */
1050         __hyp_set_vectors(kvm_get_idmap_vector());
1051
1052         boot_pgd_ptr = kvm_mmu_get_boot_httbr();
1053         pgd_ptr = kvm_mmu_get_httbr();
1054         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1055         hyp_stack_ptr = stack_page + PAGE_SIZE;
1056         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1057
1058         __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
1059         __cpu_init_stage2();
1060
1061         kvm_arm_init_debug();
1062 }
1063
1064 static int hyp_init_cpu_notify(struct notifier_block *self,
1065                                unsigned long action, void *cpu)
1066 {
1067         switch (action) {
1068         case CPU_STARTING:
1069         case CPU_STARTING_FROZEN:
1070                 if (__hyp_get_vectors() == hyp_default_vectors)
1071                         cpu_init_hyp_mode(NULL);
1072                 break;
1073         }
1074
1075         return NOTIFY_OK;
1076 }
1077
1078 static struct notifier_block hyp_init_cpu_nb = {
1079         .notifier_call = hyp_init_cpu_notify,
1080 };
1081
1082 #ifdef CONFIG_CPU_PM
1083 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1084                                     unsigned long cmd,
1085                                     void *v)
1086 {
1087         if (cmd == CPU_PM_EXIT &&
1088             __hyp_get_vectors() == hyp_default_vectors) {
1089                 cpu_init_hyp_mode(NULL);
1090                 return NOTIFY_OK;
1091         }
1092
1093         return NOTIFY_DONE;
1094 }
1095
1096 static struct notifier_block hyp_init_cpu_pm_nb = {
1097         .notifier_call = hyp_init_cpu_pm_notifier,
1098 };
1099
1100 static void __init hyp_cpu_pm_init(void)
1101 {
1102         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1103 }
1104 #else
1105 static inline void hyp_cpu_pm_init(void)
1106 {
1107 }
1108 #endif
1109
1110 static void teardown_common_resources(void)
1111 {
1112         free_percpu(kvm_host_cpu_state);
1113 }
1114
1115 static int init_common_resources(void)
1116 {
1117         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1118         if (!kvm_host_cpu_state) {
1119                 kvm_err("Cannot allocate host CPU state\n");
1120                 return -ENOMEM;
1121         }
1122
1123         return 0;
1124 }
1125
1126 static int init_subsystems(void)
1127 {
1128         int err;
1129
1130         /*
1131          * Init HYP view of VGIC
1132          */
1133         err = kvm_vgic_hyp_init();
1134         switch (err) {
1135         case 0:
1136                 vgic_present = true;
1137                 break;
1138         case -ENODEV:
1139         case -ENXIO:
1140                 vgic_present = false;
1141                 break;
1142         default:
1143                 return err;
1144         }
1145
1146         /*
1147          * Init HYP architected timer support
1148          */
1149         err = kvm_timer_hyp_init();
1150         if (err)
1151                 return err;
1152
1153         kvm_perf_init();
1154         kvm_coproc_table_init();
1155
1156         return 0;
1157 }
1158
1159 static void teardown_hyp_mode(void)
1160 {
1161         int cpu;
1162
1163         if (is_kernel_in_hyp_mode())
1164                 return;
1165
1166         free_hyp_pgds();
1167         for_each_possible_cpu(cpu)
1168                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1169 }
1170
1171 static int init_vhe_mode(void)
1172 {
1173         /*
1174          * Execute the init code on each CPU.
1175          */
1176         on_each_cpu(cpu_init_stage2, NULL, 1);
1177
1178         /* set size of VMID supported by CPU */
1179         kvm_vmid_bits = kvm_get_vmid_bits();
1180         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1181
1182         kvm_info("VHE mode initialized successfully\n");
1183         return 0;
1184 }
1185
1186 /**
1187  * Inits Hyp-mode on all online CPUs
1188  */
1189 static int init_hyp_mode(void)
1190 {
1191         int cpu;
1192         int err = 0;
1193
1194         /*
1195          * Allocate Hyp PGD and setup Hyp identity mapping
1196          */
1197         err = kvm_mmu_init();
1198         if (err)
1199                 goto out_err;
1200
1201         /*
1202          * It is probably enough to obtain the default on one
1203          * CPU. It's unlikely to be different on the others.
1204          */
1205         hyp_default_vectors = __hyp_get_vectors();
1206
1207         /*
1208          * Allocate stack pages for Hypervisor-mode
1209          */
1210         for_each_possible_cpu(cpu) {
1211                 unsigned long stack_page;
1212
1213                 stack_page = __get_free_page(GFP_KERNEL);
1214                 if (!stack_page) {
1215                         err = -ENOMEM;
1216                         goto out_err;
1217                 }
1218
1219                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1220         }
1221
1222         /*
1223          * Map the Hyp-code called directly from the host
1224          */
1225         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1226                                   kvm_ksym_ref(__hyp_text_end));
1227         if (err) {
1228                 kvm_err("Cannot map world-switch code\n");
1229                 goto out_err;
1230         }
1231
1232         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1233                                   kvm_ksym_ref(__end_rodata));
1234         if (err) {
1235                 kvm_err("Cannot map rodata section\n");
1236                 goto out_err;
1237         }
1238
1239         /*
1240          * Map the Hyp stack pages
1241          */
1242         for_each_possible_cpu(cpu) {
1243                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1244                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
1245
1246                 if (err) {
1247                         kvm_err("Cannot map hyp stack\n");
1248                         goto out_err;
1249                 }
1250         }
1251
1252         for_each_possible_cpu(cpu) {
1253                 kvm_cpu_context_t *cpu_ctxt;
1254
1255                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1256                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
1257
1258                 if (err) {
1259                         kvm_err("Cannot map host CPU state: %d\n", err);
1260                         goto out_err;
1261                 }
1262         }
1263
1264         /*
1265          * Execute the init code on each CPU.
1266          */
1267         on_each_cpu(cpu_init_hyp_mode, NULL, 1);
1268
1269 #ifndef CONFIG_HOTPLUG_CPU
1270         free_boot_hyp_pgd();
1271 #endif
1272
1273         cpu_notifier_register_begin();
1274
1275         err = __register_cpu_notifier(&hyp_init_cpu_nb);
1276
1277         cpu_notifier_register_done();
1278
1279         if (err) {
1280                 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
1281                 goto out_err;
1282         }
1283
1284         hyp_cpu_pm_init();
1285
1286         /* set size of VMID supported by CPU */
1287         kvm_vmid_bits = kvm_get_vmid_bits();
1288         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1289
1290         kvm_info("Hyp mode initialized successfully\n");
1291
1292         return 0;
1293
1294 out_err:
1295         teardown_hyp_mode();
1296         kvm_err("error initializing Hyp mode: %d\n", err);
1297         return err;
1298 }
1299
1300 static void check_kvm_target_cpu(void *ret)
1301 {
1302         *(int *)ret = kvm_target_cpu();
1303 }
1304
1305 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1306 {
1307         struct kvm_vcpu *vcpu;
1308         int i;
1309
1310         mpidr &= MPIDR_HWID_BITMASK;
1311         kvm_for_each_vcpu(i, vcpu, kvm) {
1312                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1313                         return vcpu;
1314         }
1315         return NULL;
1316 }
1317
1318 /**
1319  * Initialize Hyp-mode and memory mappings on all CPUs.
1320  */
1321 int kvm_arch_init(void *opaque)
1322 {
1323         int err;
1324         int ret, cpu;
1325
1326         if (!is_hyp_mode_available()) {
1327                 kvm_err("HYP mode not available\n");
1328                 return -ENODEV;
1329         }
1330
1331         for_each_online_cpu(cpu) {
1332                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1333                 if (ret < 0) {
1334                         kvm_err("Error, CPU %d not supported!\n", cpu);
1335                         return -ENODEV;
1336                 }
1337         }
1338
1339         err = init_common_resources();
1340         if (err)
1341                 return err;
1342
1343         if (is_kernel_in_hyp_mode())
1344                 err = init_vhe_mode();
1345         else
1346                 err = init_hyp_mode();
1347         if (err)
1348                 goto out_err;
1349
1350         err = init_subsystems();
1351         if (err)
1352                 goto out_hyp;
1353
1354         return 0;
1355
1356 out_hyp:
1357         teardown_hyp_mode();
1358 out_err:
1359         teardown_common_resources();
1360         return err;
1361 }
1362
1363 /* NOP: Compiling as a module not supported */
1364 void kvm_arch_exit(void)
1365 {
1366         kvm_perf_teardown();
1367 }
1368
1369 static int arm_init(void)
1370 {
1371         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1372         return rc;
1373 }
1374
1375 module_init(arm_init);