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