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