arch/arm/kvm/arm.c

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <linux/cpu_pm.h>
  20 #include <linux/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/kvm_host.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <linux/mman.h>
  28 #include <linux/sched.h>
  29 #include <linux/kvm.h>
  30 #include <trace/events/kvm.h>
  31 #include <kvm/arm_pmu.h>
  32
  33 #define CREATE_TRACE_POINTS
  34 #include "trace.h"
  35
  36 #include <asm/uaccess.h>
  37 #include <asm/ptrace.h>
  38 #include <asm/mman.h>
  39 #include <asm/tlbflush.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/virt.h>
  42 #include <asm/kvm_arm.h>
  43 #include <asm/kvm_asm.h>
  44 #include <asm/kvm_mmu.h>
  45 #include <asm/kvm_emulate.h>
  46 #include <asm/kvm_coproc.h>
  47 #include <asm/kvm_psci.h>
  48 #include <asm/sections.h>
  49
  50 #ifdef REQUIRES_VIRT
  51 __asm__(".arch_extension        virt");
  52 #endif
  53
  54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
  55 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
  56 static unsigned long hyp_default_vectors;
  57
  58 /* Per-CPU variable containing the currently running vcpu. */
  59 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
  60
  61 /* The VMID used in the VTTBR */
  62 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
  63 static u32 kvm_next_vmid;
  64 static unsigned int kvm_vmid_bits __read_mostly;
  65 static DEFINE_SPINLOCK(kvm_vmid_lock);
  66
  67 static bool vgic_present;
  68
  69 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
  70
  71 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  72 {
  73         BUG_ON(preemptible());
  74         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  75 }
  76
  77 /**
  78  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  79  * Must be called from non-preemptible context
  80  */
  81 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  82 {
  83         BUG_ON(preemptible());
  84         return __this_cpu_read(kvm_arm_running_vcpu);
  85 }
  86
  87 /**
  88  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  89  */
  90 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
  91 {
  92         return &kvm_arm_running_vcpu;
  93 }
  94
  95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  96 {
  97         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
  98 }
  99
 100 int kvm_arch_hardware_setup(void)
 101 {
 102         return 0;
 103 }
 104
 105 void kvm_arch_check_processor_compat(void *rtn)
 106 {
 107         *(int *)rtn = 0;
 108 }
 109
 110
 111 /**
 112  * kvm_arch_init_vm - initializes a VM data structure
 113  * @kvm:        pointer to the KVM struct
 114  */
 115 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 116 {
 117         int ret = 0;
 118
 119         if (type)
 120                 return -EINVAL;
 121
 122         ret = kvm_alloc_stage2_pgd(kvm);
 123         if (ret)
 124                 goto out_fail_alloc;
 125
 126         ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
 127         if (ret)
 128                 goto out_free_stage2_pgd;
 129
 130         kvm_vgic_early_init(kvm);
 131         kvm_timer_init(kvm);
 132
 133         /* Mark the initial VMID generation invalid */
 134         kvm->arch.vmid_gen = 0;
 135
 136         /* The maximum number of VCPUs is limited by the host's GIC model */
 137         kvm->arch.max_vcpus = vgic_present ?
 138                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 139
 140         return ret;
 141 out_free_stage2_pgd:
 142         kvm_free_stage2_pgd(kvm);
 143 out_fail_alloc:
 144         return ret;
 145 }
 146
 147 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 148 {
 149         return VM_FAULT_SIGBUS;
 150 }
 151
 152
 153 /**
 154  * kvm_arch_destroy_vm - destroy the VM data structure
 155  * @kvm:        pointer to the KVM struct
 156  */
 157 void kvm_arch_destroy_vm(struct kvm *kvm)
 158 {
 159         int i;
 160
 161         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 162                 if (kvm->vcpus[i]) {
 163                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 164                         kvm->vcpus[i] = NULL;
 165                 }
 166         }
 167
 168         kvm_vgic_destroy(kvm);
 169 }
 170
 171 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 172 {
 173         int r;
 174         switch (ext) {
 175         case KVM_CAP_IRQCHIP:
 176                 r = vgic_present;
 177                 break;
 178         case KVM_CAP_IOEVENTFD:
 179         case KVM_CAP_DEVICE_CTRL:
 180         case KVM_CAP_USER_MEMORY:
 181         case KVM_CAP_SYNC_MMU:
 182         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 183         case KVM_CAP_ONE_REG:
 184         case KVM_CAP_ARM_PSCI:
 185         case KVM_CAP_ARM_PSCI_0_2:
 186         case KVM_CAP_READONLY_MEM:
 187         case KVM_CAP_MP_STATE:
 188                 r = 1;
 189                 break;
 190         case KVM_CAP_COALESCED_MMIO:
 191                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 192                 break;
 193         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 194                 r = 1;
 195                 break;
 196         case KVM_CAP_NR_VCPUS:
 197                 r = num_online_cpus();
 198                 break;
 199         case KVM_CAP_MAX_VCPUS:
 200                 r = KVM_MAX_VCPUS;
 201                 break;
 202         default:
 203                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
 204                 break;
 205         }
 206         return r;
 207 }
 208
 209 long kvm_arch_dev_ioctl(struct file *filp,
 210                         unsigned int ioctl, unsigned long arg)
 211 {
 212         return -EINVAL;
 213 }
 214
 215
 216 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 217 {
 218         int err;
 219         struct kvm_vcpu *vcpu;
 220
 221         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 222                 err = -EBUSY;
 223                 goto out;
 224         }
 225
 226         if (id >= kvm->arch.max_vcpus) {
 227                 err = -EINVAL;
 228                 goto out;
 229         }
 230
 231         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 232         if (!vcpu) {
 233                 err = -ENOMEM;
 234                 goto out;
 235         }
 236
 237         err = kvm_vcpu_init(vcpu, kvm, id);
 238         if (err)
 239                 goto free_vcpu;
 240
 241         err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 242         if (err)
 243                 goto vcpu_uninit;
 244
 245         return vcpu;
 246 vcpu_uninit:
 247         kvm_vcpu_uninit(vcpu);
 248 free_vcpu:
 249         kmem_cache_free(kvm_vcpu_cache, vcpu);
 250 out:
 251         return ERR_PTR(err);
 252 }
 253
 254 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 255 {
 256         kvm_vgic_vcpu_early_init(vcpu);
 257 }
 258
 259 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 260 {
 261         kvm_mmu_free_memory_caches(vcpu);
 262         kvm_timer_vcpu_terminate(vcpu);
 263         kvm_vgic_vcpu_destroy(vcpu);
 264         kvm_pmu_vcpu_destroy(vcpu);
 265         kvm_vcpu_uninit(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 check
 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 = 0;
 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                 ret = kvm_timer_enable(vcpu);
 482
 483         return ret;
 484 }
 485
 486 bool kvm_arch_intc_initialized(struct kvm *kvm)
 487 {
 488         return vgic_initialized(kvm);
 489 }
 490
 491 void kvm_arm_halt_guest(struct kvm *kvm)
 492 {
 493         int i;
 494         struct kvm_vcpu *vcpu;
 495
 496         kvm_for_each_vcpu(i, vcpu, kvm)
 497                 vcpu->arch.pause = true;
 498         kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
 499 }
 500
 501 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
 502 {
 503         vcpu->arch.pause = true;
 504         kvm_vcpu_kick(vcpu);
 505 }
 506
 507 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
 508 {
 509         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 510
 511         vcpu->arch.pause = false;
 512         swake_up(wq);
 513 }
 514
 515 void kvm_arm_resume_guest(struct kvm *kvm)
 516 {
 517         int i;
 518         struct kvm_vcpu *vcpu;
 519
 520         kvm_for_each_vcpu(i, vcpu, kvm)
 521                 kvm_arm_resume_vcpu(vcpu);
 522 }
 523
 524 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 525 {
 526         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 527
 528         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 529                                        (!vcpu->arch.pause)));
 530 }
 531
 532 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 533 {
 534         return vcpu->arch.target >= 0;
 535 }
 536
 537 /**
 538  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 539  * @vcpu:       The VCPU pointer
 540  * @run:        The kvm_run structure pointer used for userspace state exchange
 541  *
 542  * This function is called through the VCPU_RUN ioctl called from user space. It
 543  * will execute VM code in a loop until the time slice for the process is used
 544  * or some emulation is needed from user space in which case the function will
 545  * return with return value 0 and with the kvm_run structure filled in with the
 546  * required data for the requested emulation.
 547  */
 548 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 549 {
 550         int ret;
 551         sigset_t sigsaved;
 552
 553         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 554                 return -ENOEXEC;
 555
 556         ret = kvm_vcpu_first_run_init(vcpu);
 557         if (ret)
 558                 return ret;
 559
 560         if (run->exit_reason == KVM_EXIT_MMIO) {
 561                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 562                 if (ret)
 563                         return ret;
 564         }
 565
 566         if (vcpu->sigset_active)
 567                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 568
 569         ret = 1;
 570         run->exit_reason = KVM_EXIT_UNKNOWN;
 571         while (ret > 0) {
 572                 /*
 573                  * Check conditions before entering the guest
 574                  */
 575                 cond_resched();
 576
 577                 update_vttbr(vcpu->kvm);
 578
 579                 if (vcpu->arch.power_off || vcpu->arch.pause)
 580                         vcpu_sleep(vcpu);
 581
 582                 /*
 583                  * Preparing the interrupts to be injected also
 584                  * involves poking the GIC, which must be done in a
 585                  * non-preemptible context.
 586                  */
 587                 preempt_disable();
 588                 kvm_pmu_flush_hwstate(vcpu);
 589                 kvm_timer_flush_hwstate(vcpu);
 590                 kvm_vgic_flush_hwstate(vcpu);
 591
 592                 local_irq_disable();
 593
 594                 /*
 595                  * Re-check atomic conditions
 596                  */
 597                 if (signal_pending(current)) {
 598                         ret = -EINTR;
 599                         run->exit_reason = KVM_EXIT_INTR;
 600                 }
 601
 602                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 603                         vcpu->arch.power_off || vcpu->arch.pause) {
 604                         local_irq_enable();
 605                         kvm_pmu_sync_hwstate(vcpu);
 606                         kvm_timer_sync_hwstate(vcpu);
 607                         kvm_vgic_sync_hwstate(vcpu);
 608                         preempt_enable();
 609                         continue;
 610                 }
 611
 612                 kvm_arm_setup_debug(vcpu);
 613
 614                 /**************************************************************
 615                  * Enter the guest
 616                  */
 617                 trace_kvm_entry(*vcpu_pc(vcpu));
 618                 guest_enter_irqoff();
 619                 vcpu->mode = IN_GUEST_MODE;
 620
 621                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 622
 623                 vcpu->mode = OUTSIDE_GUEST_MODE;
 624                 vcpu->stat.exits++;
 625                 /*
 626                  * Back from guest
 627                  *************************************************************/
 628
 629                 kvm_arm_clear_debug(vcpu);
 630
 631                 /*
 632                  * We may have taken a host interrupt in HYP mode (ie
 633                  * while executing the guest). This interrupt is still
 634                  * pending, as we haven't serviced it yet!
 635                  *
 636                  * We're now back in SVC mode, with interrupts
 637                  * disabled.  Enabling the interrupts now will have
 638                  * the effect of taking the interrupt again, in SVC
 639                  * mode this time.
 640                  */
 641                 local_irq_enable();
 642
 643                 /*
 644                  * We do local_irq_enable() before calling guest_exit() so
 645                  * that if a timer interrupt hits while running the guest we
 646                  * account that tick as being spent in the guest.  We enable
 647                  * preemption after calling guest_exit() so that if we get
 648                  * preempted we make sure ticks after that is not counted as
 649                  * guest time.
 650                  */
 651                 guest_exit();
 652                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 653
 654                 /*
 655                  * We must sync the PMU and timer state before the vgic state so
 656                  * that the vgic can properly sample the updated state of the
 657                  * interrupt line.
 658                  */
 659                 kvm_pmu_sync_hwstate(vcpu);
 660                 kvm_timer_sync_hwstate(vcpu);
 661
 662                 kvm_vgic_sync_hwstate(vcpu);
 663
 664                 preempt_enable();
 665
 666                 ret = handle_exit(vcpu, run, ret);
 667         }
 668
 669         if (vcpu->sigset_active)
 670                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 671         return ret;
 672 }
 673
 674 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 675 {
 676         int bit_index;
 677         bool set;
 678         unsigned long *ptr;
 679
 680         if (number == KVM_ARM_IRQ_CPU_IRQ)
 681                 bit_index = __ffs(HCR_VI);
 682         else /* KVM_ARM_IRQ_CPU_FIQ */
 683                 bit_index = __ffs(HCR_VF);
 684
 685         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 686         if (level)
 687                 set = test_and_set_bit(bit_index, ptr);
 688         else
 689                 set = test_and_clear_bit(bit_index, ptr);
 690
 691         /*
 692          * If we didn't change anything, no need to wake up or kick other CPUs
 693          */
 694         if (set == level)
 695                 return 0;
 696
 697         /*
 698          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 699          * trigger a world-switch round on the running physical CPU to set the
 700          * virtual IRQ/FIQ fields in the HCR appropriately.
 701          */
 702         kvm_vcpu_kick(vcpu);
 703
 704         return 0;
 705 }
 706
 707 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 708                           bool line_status)
 709 {
 710         u32 irq = irq_level->irq;
 711         unsigned int irq_type, vcpu_idx, irq_num;
 712         int nrcpus = atomic_read(&kvm->online_vcpus);
 713         struct kvm_vcpu *vcpu = NULL;
 714         bool level = irq_level->level;
 715
 716         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 717         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 718         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 719
 720         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 721
 722         switch (irq_type) {
 723         case KVM_ARM_IRQ_TYPE_CPU:
 724                 if (irqchip_in_kernel(kvm))
 725                         return -ENXIO;
 726
 727                 if (vcpu_idx >= nrcpus)
 728                         return -EINVAL;
 729
 730                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 731                 if (!vcpu)
 732                         return -EINVAL;
 733
 734                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 735                         return -EINVAL;
 736
 737                 return vcpu_interrupt_line(vcpu, irq_num, level);
 738         case KVM_ARM_IRQ_TYPE_PPI:
 739                 if (!irqchip_in_kernel(kvm))
 740                         return -ENXIO;
 741
 742                 if (vcpu_idx >= nrcpus)
 743                         return -EINVAL;
 744
 745                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 746                 if (!vcpu)
 747                         return -EINVAL;
 748
 749                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 750                         return -EINVAL;
 751
 752                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 753         case KVM_ARM_IRQ_TYPE_SPI:
 754                 if (!irqchip_in_kernel(kvm))
 755                         return -ENXIO;
 756
 757                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 758                         return -EINVAL;
 759
 760                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 761         }
 762
 763         return -EINVAL;
 764 }
 765
 766 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 767                                const struct kvm_vcpu_init *init)
 768 {
 769         unsigned int i;
 770         int phys_target = kvm_target_cpu();
 771
 772         if (init->target != phys_target)
 773                 return -EINVAL;
 774
 775         /*
 776          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 777          * use the same target.
 778          */
 779         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 780                 return -EINVAL;
 781
 782         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 783         for (i = 0; i < sizeof(init->features) * 8; i++) {
 784                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 785
 786                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 787                         return -ENOENT;
 788
 789                 /*
 790                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 791                  * use the same feature set.
 792                  */
 793                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 794                     test_bit(i, vcpu->arch.features) != set)
 795                         return -EINVAL;
 796
 797                 if (set)
 798                         set_bit(i, vcpu->arch.features);
 799         }
 800
 801         vcpu->arch.target = phys_target;
 802
 803         /* Now we know what it is, we can reset it. */
 804         return kvm_reset_vcpu(vcpu);
 805 }
 806
 807
 808 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 809                                          struct kvm_vcpu_init *init)
 810 {
 811         int ret;
 812
 813         ret = kvm_vcpu_set_target(vcpu, init);
 814         if (ret)
 815                 return ret;
 816
 817         /*
 818          * Ensure a rebooted VM will fault in RAM pages and detect if the
 819          * guest MMU is turned off and flush the caches as needed.
 820          */
 821         if (vcpu->arch.has_run_once)
 822                 stage2_unmap_vm(vcpu->kvm);
 823
 824         vcpu_reset_hcr(vcpu);
 825
 826         /*
 827          * Handle the "start in power-off" case.
 828          */
 829         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 830                 vcpu->arch.power_off = true;
 831         else
 832                 vcpu->arch.power_off = false;
 833
 834         return 0;
 835 }
 836
 837 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 838                                  struct kvm_device_attr *attr)
 839 {
 840         int ret = -ENXIO;
 841
 842         switch (attr->group) {
 843         default:
 844                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 845                 break;
 846         }
 847
 848         return ret;
 849 }
 850
 851 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 852                                  struct kvm_device_attr *attr)
 853 {
 854         int ret = -ENXIO;
 855
 856         switch (attr->group) {
 857         default:
 858                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 859                 break;
 860         }
 861
 862         return ret;
 863 }
 864
 865 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 866                                  struct kvm_device_attr *attr)
 867 {
 868         int ret = -ENXIO;
 869
 870         switch (attr->group) {
 871         default:
 872                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 873                 break;
 874         }
 875
 876         return ret;
 877 }
 878
 879 long kvm_arch_vcpu_ioctl(struct file *filp,
 880                          unsigned int ioctl, unsigned long arg)
 881 {
 882         struct kvm_vcpu *vcpu = filp->private_data;
 883         void __user *argp = (void __user *)arg;
 884         struct kvm_device_attr attr;
 885
 886         switch (ioctl) {
 887         case KVM_ARM_VCPU_INIT: {
 888                 struct kvm_vcpu_init init;
 889
 890                 if (copy_from_user(&init, argp, sizeof(init)))
 891                         return -EFAULT;
 892
 893                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 894         }
 895         case KVM_SET_ONE_REG:
 896         case KVM_GET_ONE_REG: {
 897                 struct kvm_one_reg reg;
 898
 899                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 900                         return -ENOEXEC;
 901
 902                 if (copy_from_user(&reg, argp, sizeof(reg)))
 903                         return -EFAULT;
 904                 if (ioctl == KVM_SET_ONE_REG)
 905                         return kvm_arm_set_reg(vcpu, &reg);
 906                 else
 907                         return kvm_arm_get_reg(vcpu, &reg);
 908         }
 909         case KVM_GET_REG_LIST: {
 910                 struct kvm_reg_list __user *user_list = argp;
 911                 struct kvm_reg_list reg_list;
 912                 unsigned n;
 913
 914                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 915                         return -ENOEXEC;
 916
 917                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 918                         return -EFAULT;
 919                 n = reg_list.n;
 920                 reg_list.n = kvm_arm_num_regs(vcpu);
 921                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 922                         return -EFAULT;
 923                 if (n < reg_list.n)
 924                         return -E2BIG;
 925                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 926         }
 927         case KVM_SET_DEVICE_ATTR: {
 928                 if (copy_from_user(&attr, argp, sizeof(attr)))
 929                         return -EFAULT;
 930                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 931         }
 932         case KVM_GET_DEVICE_ATTR: {
 933                 if (copy_from_user(&attr, argp, sizeof(attr)))
 934                         return -EFAULT;
 935                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 936         }
 937         case KVM_HAS_DEVICE_ATTR: {
 938                 if (copy_from_user(&attr, argp, sizeof(attr)))
 939                         return -EFAULT;
 940                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 941         }
 942         default:
 943                 return -EINVAL;
 944         }
 945 }
 946
 947 /**
 948  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 949  * @kvm: kvm instance
 950  * @log: slot id and address to which we copy the log
 951  *
 952  * Steps 1-4 below provide general overview of dirty page logging. See
 953  * kvm_get_dirty_log_protect() function description for additional details.
 954  *
 955  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 956  * always flush the TLB (step 4) even if previous step failed  and the dirty
 957  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 958  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 959  * writes will be marked dirty for next log read.
 960  *
 961  *   1. Take a snapshot of the bit and clear it if needed.
 962  *   2. Write protect the corresponding page.
 963  *   3. Copy the snapshot to the userspace.
 964  *   4. Flush TLB's if needed.
 965  */
 966 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 967 {
 968         bool is_dirty = false;
 969         int r;
 970
 971         mutex_lock(&kvm->slots_lock);
 972
 973         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 974
 975         if (is_dirty)
 976                 kvm_flush_remote_tlbs(kvm);
 977
 978         mutex_unlock(&kvm->slots_lock);
 979         return r;
 980 }
 981
 982 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 983                                         struct kvm_arm_device_addr *dev_addr)
 984 {
 985         unsigned long dev_id, type;
 986
 987         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 988                 KVM_ARM_DEVICE_ID_SHIFT;
 989         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 990                 KVM_ARM_DEVICE_TYPE_SHIFT;
 991
 992         switch (dev_id) {
 993         case KVM_ARM_DEVICE_VGIC_V2:
 994                 if (!vgic_present)
 995                         return -ENXIO;
 996                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
 997         default:
 998                 return -ENODEV;
 999         }
1000 }
1001
1002 long kvm_arch_vm_ioctl(struct file *filp,
1003                        unsigned int ioctl, unsigned long arg)
1004 {
1005         struct kvm *kvm = filp->private_data;
1006         void __user *argp = (void __user *)arg;
1007
1008         switch (ioctl) {
1009         case KVM_CREATE_IRQCHIP: {
1010                 int ret;
1011                 if (!vgic_present)
1012                         return -ENXIO;
1013                 mutex_lock(&kvm->lock);
1014                 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1015                 mutex_unlock(&kvm->lock);
1016                 return ret;
1017         }
1018         case KVM_ARM_SET_DEVICE_ADDR: {
1019                 struct kvm_arm_device_addr dev_addr;
1020
1021                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1022                         return -EFAULT;
1023                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1024         }
1025         case KVM_ARM_PREFERRED_TARGET: {
1026                 int err;
1027                 struct kvm_vcpu_init init;
1028
1029                 err = kvm_vcpu_preferred_target(&init);
1030                 if (err)
1031                         return err;
1032
1033                 if (copy_to_user(argp, &init, sizeof(init)))
1034                         return -EFAULT;
1035
1036                 return 0;
1037         }
1038         default:
1039                 return -EINVAL;
1040         }
1041 }
1042
1043 static void cpu_init_hyp_mode(void *dummy)
1044 {
1045         phys_addr_t pgd_ptr;
1046         unsigned long hyp_stack_ptr;
1047         unsigned long stack_page;
1048         unsigned long vector_ptr;
1049
1050         /* Switch from the HYP stub to our own HYP init vector */
1051         __hyp_set_vectors(kvm_get_idmap_vector());
1052
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(pgd_ptr, hyp_stack_ptr, vector_ptr);
1059         __cpu_init_stage2();
1060
1061         kvm_arm_init_debug();
1062 }
1063
1064 static void cpu_hyp_reinit(void)
1065 {
1066         if (is_kernel_in_hyp_mode()) {
1067                 /*
1068                  * __cpu_init_stage2() is safe to call even if the PM
1069                  * event was cancelled before the CPU was reset.
1070                  */
1071                 __cpu_init_stage2();
1072         } else {
1073                 if (__hyp_get_vectors() == hyp_default_vectors)
1074                         cpu_init_hyp_mode(NULL);
1075         }
1076 }
1077
1078 static void cpu_hyp_reset(void)
1079 {
1080         if (!is_kernel_in_hyp_mode())
1081                 __cpu_reset_hyp_mode(hyp_default_vectors,
1082                                      kvm_get_idmap_start());
1083 }
1084
1085 static void _kvm_arch_hardware_enable(void *discard)
1086 {
1087         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1088                 cpu_hyp_reinit();
1089                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1090         }
1091 }
1092
1093 int kvm_arch_hardware_enable(void)
1094 {
1095         _kvm_arch_hardware_enable(NULL);
1096         return 0;
1097 }
1098
1099 static void _kvm_arch_hardware_disable(void *discard)
1100 {
1101         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1102                 cpu_hyp_reset();
1103                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1104         }
1105 }
1106
1107 void kvm_arch_hardware_disable(void)
1108 {
1109         _kvm_arch_hardware_disable(NULL);
1110 }
1111
1112 #ifdef CONFIG_CPU_PM
1113 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1114                                     unsigned long cmd,
1115                                     void *v)
1116 {
1117         /*
1118          * kvm_arm_hardware_enabled is left with its old value over
1119          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1120          * re-enable hyp.
1121          */
1122         switch (cmd) {
1123         case CPU_PM_ENTER:
1124                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1125                         /*
1126                          * don't update kvm_arm_hardware_enabled here
1127                          * so that the hardware will be re-enabled
1128                          * when we resume. See below.
1129                          */
1130                         cpu_hyp_reset();
1131
1132                 return NOTIFY_OK;
1133         case CPU_PM_EXIT:
1134                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1135                         /* The hardware was enabled before suspend. */
1136                         cpu_hyp_reinit();
1137
1138                 return NOTIFY_OK;
1139
1140         default:
1141                 return NOTIFY_DONE;
1142         }
1143 }
1144
1145 static struct notifier_block hyp_init_cpu_pm_nb = {
1146         .notifier_call = hyp_init_cpu_pm_notifier,
1147 };
1148
1149 static void __init hyp_cpu_pm_init(void)
1150 {
1151         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1152 }
1153 static void __init hyp_cpu_pm_exit(void)
1154 {
1155         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1156 }
1157 #else
1158 static inline void hyp_cpu_pm_init(void)
1159 {
1160 }
1161 static inline void hyp_cpu_pm_exit(void)
1162 {
1163 }
1164 #endif
1165
1166 static void teardown_common_resources(void)
1167 {
1168         free_percpu(kvm_host_cpu_state);
1169 }
1170
1171 static int init_common_resources(void)
1172 {
1173         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1174         if (!kvm_host_cpu_state) {
1175                 kvm_err("Cannot allocate host CPU state\n");
1176                 return -ENOMEM;
1177         }
1178
1179         return 0;
1180 }
1181
1182 static int init_subsystems(void)
1183 {
1184         int err = 0;
1185
1186         /*
1187          * Enable hardware so that subsystem initialisation can access EL2.
1188          */
1189         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1190
1191         /*
1192          * Register CPU lower-power notifier
1193          */
1194         hyp_cpu_pm_init();
1195
1196         /*
1197          * Init HYP view of VGIC
1198          */
1199         err = kvm_vgic_hyp_init();
1200         switch (err) {
1201         case 0:
1202                 vgic_present = true;
1203                 break;
1204         case -ENODEV:
1205         case -ENXIO:
1206                 vgic_present = false;
1207                 err = 0;
1208                 break;
1209         default:
1210                 goto out;
1211         }
1212
1213         /*
1214          * Init HYP architected timer support
1215          */
1216         err = kvm_timer_hyp_init();
1217         if (err)
1218                 goto out;
1219
1220         kvm_perf_init();
1221         kvm_coproc_table_init();
1222
1223 out:
1224         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1225
1226         return err;
1227 }
1228
1229 static void teardown_hyp_mode(void)
1230 {
1231         int cpu;
1232
1233         if (is_kernel_in_hyp_mode())
1234                 return;
1235
1236         free_hyp_pgds();
1237         for_each_possible_cpu(cpu)
1238                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1239         hyp_cpu_pm_exit();
1240 }
1241
1242 static int init_vhe_mode(void)
1243 {
1244         /* set size of VMID supported by CPU */
1245         kvm_vmid_bits = kvm_get_vmid_bits();
1246         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1247
1248         kvm_info("VHE mode initialized successfully\n");
1249         return 0;
1250 }
1251
1252 /**
1253  * Inits Hyp-mode on all online CPUs
1254  */
1255 static int init_hyp_mode(void)
1256 {
1257         int cpu;
1258         int err = 0;
1259
1260         /*
1261          * Allocate Hyp PGD and setup Hyp identity mapping
1262          */
1263         err = kvm_mmu_init();
1264         if (err)
1265                 goto out_err;
1266
1267         /*
1268          * It is probably enough to obtain the default on one
1269          * CPU. It's unlikely to be different on the others.
1270          */
1271         hyp_default_vectors = __hyp_get_vectors();
1272
1273         /*
1274          * Allocate stack pages for Hypervisor-mode
1275          */
1276         for_each_possible_cpu(cpu) {
1277                 unsigned long stack_page;
1278
1279                 stack_page = __get_free_page(GFP_KERNEL);
1280                 if (!stack_page) {
1281                         err = -ENOMEM;
1282                         goto out_err;
1283                 }
1284
1285                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1286         }
1287
1288         /*
1289          * Map the Hyp-code called directly from the host
1290          */
1291         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1292                                   kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1293         if (err) {
1294                 kvm_err("Cannot map world-switch code\n");
1295                 goto out_err;
1296         }
1297
1298         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1299                                   kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1300         if (err) {
1301                 kvm_err("Cannot map rodata section\n");
1302                 goto out_err;
1303         }
1304
1305         /*
1306          * Map the Hyp stack pages
1307          */
1308         for_each_possible_cpu(cpu) {
1309                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1310                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1311                                           PAGE_HYP);
1312
1313                 if (err) {
1314                         kvm_err("Cannot map hyp stack\n");
1315                         goto out_err;
1316                 }
1317         }
1318
1319         for_each_possible_cpu(cpu) {
1320                 kvm_cpu_context_t *cpu_ctxt;
1321
1322                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1323                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1324
1325                 if (err) {
1326                         kvm_err("Cannot map host CPU state: %d\n", err);
1327                         goto out_err;
1328                 }
1329         }
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);