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 = 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                 __kvm_guest_enter();
 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 kvm_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 kvm_guest_exit() so that if we get
 648                  * preempted we make sure ticks after that is not counted as
 649                  * guest time.
 650                  */
 651                 kvm_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                 if (!vgic_present)
1011                         return -ENXIO;
1012                 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1013         }
1014         case KVM_ARM_SET_DEVICE_ADDR: {
1015                 struct kvm_arm_device_addr dev_addr;
1016
1017                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1018                         return -EFAULT;
1019                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1020         }
1021         case KVM_ARM_PREFERRED_TARGET: {
1022                 int err;
1023                 struct kvm_vcpu_init init;
1024
1025                 err = kvm_vcpu_preferred_target(&init);
1026                 if (err)
1027                         return err;
1028
1029                 if (copy_to_user(argp, &init, sizeof(init)))
1030                         return -EFAULT;
1031
1032                 return 0;
1033         }
1034         default:
1035                 return -EINVAL;
1036         }
1037 }
1038
1039 static void cpu_init_hyp_mode(void *dummy)
1040 {
1041         phys_addr_t boot_pgd_ptr;
1042         phys_addr_t pgd_ptr;
1043         unsigned long hyp_stack_ptr;
1044         unsigned long stack_page;
1045         unsigned long vector_ptr;
1046
1047         /* Switch from the HYP stub to our own HYP init vector */
1048         __hyp_set_vectors(kvm_get_idmap_vector());
1049
1050         boot_pgd_ptr = kvm_mmu_get_boot_httbr();
1051         pgd_ptr = kvm_mmu_get_httbr();
1052         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1053         hyp_stack_ptr = stack_page + PAGE_SIZE;
1054         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1055
1056         __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
1057         __cpu_init_stage2();
1058
1059         kvm_arm_init_debug();
1060 }
1061
1062 static void cpu_hyp_reinit(void)
1063 {
1064         if (is_kernel_in_hyp_mode()) {
1065                 /*
1066                  * __cpu_init_stage2() is safe to call even if the PM
1067                  * event was cancelled before the CPU was reset.
1068                  */
1069                 __cpu_init_stage2();
1070         } else {
1071                 if (__hyp_get_vectors() == hyp_default_vectors)
1072                         cpu_init_hyp_mode(NULL);
1073         }
1074 }
1075
1076 static void cpu_hyp_reset(void)
1077 {
1078         phys_addr_t boot_pgd_ptr;
1079         phys_addr_t phys_idmap_start;
1080
1081         if (!is_kernel_in_hyp_mode()) {
1082                 boot_pgd_ptr = kvm_mmu_get_boot_httbr();
1083                 phys_idmap_start = kvm_get_idmap_start();
1084
1085                 __cpu_reset_hyp_mode(boot_pgd_ptr, phys_idmap_start);
1086         }
1087 }
1088
1089 static void _kvm_arch_hardware_enable(void *discard)
1090 {
1091         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1092                 cpu_hyp_reinit();
1093                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1094         }
1095 }
1096
1097 int kvm_arch_hardware_enable(void)
1098 {
1099         _kvm_arch_hardware_enable(NULL);
1100         return 0;
1101 }
1102
1103 static void _kvm_arch_hardware_disable(void *discard)
1104 {
1105         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1106                 cpu_hyp_reset();
1107                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1108         }
1109 }
1110
1111 void kvm_arch_hardware_disable(void)
1112 {
1113         _kvm_arch_hardware_disable(NULL);
1114 }
1115
1116 #ifdef CONFIG_CPU_PM
1117 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1118                                     unsigned long cmd,
1119                                     void *v)
1120 {
1121         /*
1122          * kvm_arm_hardware_enabled is left with its old value over
1123          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1124          * re-enable hyp.
1125          */
1126         switch (cmd) {
1127         case CPU_PM_ENTER:
1128                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1129                         /*
1130                          * don't update kvm_arm_hardware_enabled here
1131                          * so that the hardware will be re-enabled
1132                          * when we resume. See below.
1133                          */
1134                         cpu_hyp_reset();
1135
1136                 return NOTIFY_OK;
1137         case CPU_PM_EXIT:
1138                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1139                         /* The hardware was enabled before suspend. */
1140                         cpu_hyp_reinit();
1141
1142                 return NOTIFY_OK;
1143
1144         default:
1145                 return NOTIFY_DONE;
1146         }
1147 }
1148
1149 static struct notifier_block hyp_init_cpu_pm_nb = {
1150         .notifier_call = hyp_init_cpu_pm_notifier,
1151 };
1152
1153 static void __init hyp_cpu_pm_init(void)
1154 {
1155         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1156 }
1157 static void __init hyp_cpu_pm_exit(void)
1158 {
1159         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1160 }
1161 #else
1162 static inline void hyp_cpu_pm_init(void)
1163 {
1164 }
1165 static inline void hyp_cpu_pm_exit(void)
1166 {
1167 }
1168 #endif
1169
1170 static void teardown_common_resources(void)
1171 {
1172         free_percpu(kvm_host_cpu_state);
1173 }
1174
1175 static int init_common_resources(void)
1176 {
1177         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1178         if (!kvm_host_cpu_state) {
1179                 kvm_err("Cannot allocate host CPU state\n");
1180                 return -ENOMEM;
1181         }
1182
1183         return 0;
1184 }
1185
1186 static int init_subsystems(void)
1187 {
1188         int err = 0;
1189
1190         /*
1191          * Enable hardware so that subsystem initialisation can access EL2.
1192          */
1193         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1194
1195         /*
1196          * Register CPU lower-power notifier
1197          */
1198         hyp_cpu_pm_init();
1199
1200         /*
1201          * Init HYP view of VGIC
1202          */
1203         err = kvm_vgic_hyp_init();
1204         switch (err) {
1205         case 0:
1206                 vgic_present = true;
1207                 break;
1208         case -ENODEV:
1209         case -ENXIO:
1210                 vgic_present = false;
1211                 err = 0;
1212                 break;
1213         default:
1214                 goto out;
1215         }
1216
1217         /*
1218          * Init HYP architected timer support
1219          */
1220         err = kvm_timer_hyp_init();
1221         if (err)
1222                 goto out;
1223
1224         kvm_perf_init();
1225         kvm_coproc_table_init();
1226
1227 out:
1228         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1229
1230         return err;
1231 }
1232
1233 static void teardown_hyp_mode(void)
1234 {
1235         int cpu;
1236
1237         if (is_kernel_in_hyp_mode())
1238                 return;
1239
1240         free_hyp_pgds();
1241         for_each_possible_cpu(cpu)
1242                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1243         hyp_cpu_pm_exit();
1244 }
1245
1246 static int init_vhe_mode(void)
1247 {
1248         /* set size of VMID supported by CPU */
1249         kvm_vmid_bits = kvm_get_vmid_bits();
1250         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1251
1252         kvm_info("VHE mode initialized successfully\n");
1253         return 0;
1254 }
1255
1256 /**
1257  * Inits Hyp-mode on all online CPUs
1258  */
1259 static int init_hyp_mode(void)
1260 {
1261         int cpu;
1262         int err = 0;
1263
1264         /*
1265          * Allocate Hyp PGD and setup Hyp identity mapping
1266          */
1267         err = kvm_mmu_init();
1268         if (err)
1269                 goto out_err;
1270
1271         /*
1272          * It is probably enough to obtain the default on one
1273          * CPU. It's unlikely to be different on the others.
1274          */
1275         hyp_default_vectors = __hyp_get_vectors();
1276
1277         /*
1278          * Allocate stack pages for Hypervisor-mode
1279          */
1280         for_each_possible_cpu(cpu) {
1281                 unsigned long stack_page;
1282
1283                 stack_page = __get_free_page(GFP_KERNEL);
1284                 if (!stack_page) {
1285                         err = -ENOMEM;
1286                         goto out_err;
1287                 }
1288
1289                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1290         }
1291
1292         /*
1293          * Map the Hyp-code called directly from the host
1294          */
1295         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1296                                   kvm_ksym_ref(__hyp_text_end));
1297         if (err) {
1298                 kvm_err("Cannot map world-switch code\n");
1299                 goto out_err;
1300         }
1301
1302         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1303                                   kvm_ksym_ref(__end_rodata));
1304         if (err) {
1305                 kvm_err("Cannot map rodata section\n");
1306                 goto out_err;
1307         }
1308
1309         /*
1310          * Map the Hyp stack pages
1311          */
1312         for_each_possible_cpu(cpu) {
1313                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1314                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
1315
1316                 if (err) {
1317                         kvm_err("Cannot map hyp stack\n");
1318                         goto out_err;
1319                 }
1320         }
1321
1322         for_each_possible_cpu(cpu) {
1323                 kvm_cpu_context_t *cpu_ctxt;
1324
1325                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1326                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
1327
1328                 if (err) {
1329                         kvm_err("Cannot map host CPU state: %d\n", err);
1330                         goto out_err;
1331                 }
1332         }
1333
1334 #ifndef CONFIG_HOTPLUG_CPU
1335         free_boot_hyp_pgd();
1336 #endif
1337
1338         /* set size of VMID supported by CPU */
1339         kvm_vmid_bits = kvm_get_vmid_bits();
1340         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1341
1342         kvm_info("Hyp mode initialized successfully\n");
1343
1344         return 0;
1345
1346 out_err:
1347         teardown_hyp_mode();
1348         kvm_err("error initializing Hyp mode: %d\n", err);
1349         return err;
1350 }
1351
1352 static void check_kvm_target_cpu(void *ret)
1353 {
1354         *(int *)ret = kvm_target_cpu();
1355 }
1356
1357 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1358 {
1359         struct kvm_vcpu *vcpu;
1360         int i;
1361
1362         mpidr &= MPIDR_HWID_BITMASK;
1363         kvm_for_each_vcpu(i, vcpu, kvm) {
1364                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1365                         return vcpu;
1366         }
1367         return NULL;
1368 }
1369
1370 /**
1371  * Initialize Hyp-mode and memory mappings on all CPUs.
1372  */
1373 int kvm_arch_init(void *opaque)
1374 {
1375         int err;
1376         int ret, cpu;
1377
1378         if (!is_hyp_mode_available()) {
1379                 kvm_err("HYP mode not available\n");
1380                 return -ENODEV;
1381         }
1382
1383         for_each_online_cpu(cpu) {
1384                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1385                 if (ret < 0) {
1386                         kvm_err("Error, CPU %d not supported!\n", cpu);
1387                         return -ENODEV;
1388                 }
1389         }
1390
1391         err = init_common_resources();
1392         if (err)
1393                 return err;
1394
1395         if (is_kernel_in_hyp_mode())
1396                 err = init_vhe_mode();
1397         else
1398                 err = init_hyp_mode();
1399         if (err)
1400                 goto out_err;
1401
1402         err = init_subsystems();
1403         if (err)
1404                 goto out_hyp;
1405
1406         return 0;
1407
1408 out_hyp:
1409         teardown_hyp_mode();
1410 out_err:
1411         teardown_common_resources();
1412         return err;
1413 }
1414
1415 /* NOP: Compiling as a module not supported */
1416 void kvm_arch_exit(void)
1417 {
1418         kvm_perf_teardown();
1419 }
1420
1421 static int arm_init(void)
1422 {
1423         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1424         return rc;
1425 }
1426
1427 module_init(arm_init);