arch/arm/kvm/arm.c

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <linux/cpu_pm.h>
  20 #include <linux/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/kvm_host.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <linux/mman.h>
  28 #include <linux/sched.h>
  29 #include <linux/kvm.h>
  30 #include <trace/events/kvm.h>
  31 #include <kvm/arm_pmu.h>
  32
  33 #define CREATE_TRACE_POINTS
  34 #include "trace.h"
  35
  36 #include <asm/uaccess.h>
  37 #include <asm/ptrace.h>
  38 #include <asm/mman.h>
  39 #include <asm/tlbflush.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/virt.h>
  42 #include <asm/kvm_arm.h>
  43 #include <asm/kvm_asm.h>
  44 #include <asm/kvm_mmu.h>
  45 #include <asm/kvm_emulate.h>
  46 #include <asm/kvm_coproc.h>
  47 #include <asm/kvm_psci.h>
  48 #include <asm/sections.h>
  49
  50 #ifdef REQUIRES_VIRT
  51 __asm__(".arch_extension        virt");
  52 #endif
  53
  54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
  55 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
  56 static unsigned long hyp_default_vectors;
  57
  58 /* Per-CPU variable containing the currently running vcpu. */
  59 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
  60
  61 /* The VMID used in the VTTBR */
  62 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
  63 static u32 kvm_next_vmid;
  64 static unsigned int kvm_vmid_bits __read_mostly;
  65 static DEFINE_SPINLOCK(kvm_vmid_lock);
  66
  67 static bool vgic_present;
  68
  69 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
  70
  71 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  72 {
  73         BUG_ON(preemptible());
  74         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  75 }
  76
  77 /**
  78  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  79  * Must be called from non-preemptible context
  80  */
  81 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  82 {
  83         BUG_ON(preemptible());
  84         return __this_cpu_read(kvm_arm_running_vcpu);
  85 }
  86
  87 /**
  88  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  89  */
  90 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
  91 {
  92         return &kvm_arm_running_vcpu;
  93 }
  94
  95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  96 {
  97         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
  98 }
  99
 100 int kvm_arch_hardware_setup(void)
 101 {
 102         return 0;
 103 }
 104
 105 void kvm_arch_check_processor_compat(void *rtn)
 106 {
 107         *(int *)rtn = 0;
 108 }
 109
 110
 111 /**
 112  * kvm_arch_init_vm - initializes a VM data structure
 113  * @kvm:        pointer to the KVM struct
 114  */
 115 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 116 {
 117         int ret = 0;
 118
 119         if (type)
 120                 return -EINVAL;
 121
 122         ret = kvm_alloc_stage2_pgd(kvm);
 123         if (ret)
 124                 goto out_fail_alloc;
 125
 126         ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
 127         if (ret)
 128                 goto out_free_stage2_pgd;
 129
 130         kvm_vgic_early_init(kvm);
 131         kvm_timer_init(kvm);
 132
 133         /* Mark the initial VMID generation invalid */
 134         kvm->arch.vmid_gen = 0;
 135
 136         /* The maximum number of VCPUs is limited by the host's GIC model */
 137         kvm->arch.max_vcpus = vgic_present ?
 138                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 139
 140         return ret;
 141 out_free_stage2_pgd:
 142         kvm_free_stage2_pgd(kvm);
 143 out_fail_alloc:
 144         return ret;
 145 }
 146
 147 bool kvm_arch_has_vcpu_debugfs(void)
 148 {
 149         return false;
 150 }
 151
 152 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 153 {
 154         return 0;
 155 }
 156
 157 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 158 {
 159         return VM_FAULT_SIGBUS;
 160 }
 161
 162
 163 /**
 164  * kvm_arch_destroy_vm - destroy the VM data structure
 165  * @kvm:        pointer to the KVM struct
 166  */
 167 void kvm_arch_destroy_vm(struct kvm *kvm)
 168 {
 169         int i;
 170
 171         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 172                 if (kvm->vcpus[i]) {
 173                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 174                         kvm->vcpus[i] = NULL;
 175                 }
 176         }
 177
 178         kvm_vgic_destroy(kvm);
 179 }
 180
 181 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 182 {
 183         int r;
 184         switch (ext) {
 185         case KVM_CAP_IRQCHIP:
 186                 r = vgic_present;
 187                 break;
 188         case KVM_CAP_IOEVENTFD:
 189         case KVM_CAP_DEVICE_CTRL:
 190         case KVM_CAP_USER_MEMORY:
 191         case KVM_CAP_SYNC_MMU:
 192         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 193         case KVM_CAP_ONE_REG:
 194         case KVM_CAP_ARM_PSCI:
 195         case KVM_CAP_ARM_PSCI_0_2:
 196         case KVM_CAP_READONLY_MEM:
 197         case KVM_CAP_MP_STATE:
 198                 r = 1;
 199                 break;
 200         case KVM_CAP_COALESCED_MMIO:
 201                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 202                 break;
 203         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 204                 r = 1;
 205                 break;
 206         case KVM_CAP_NR_VCPUS:
 207                 r = num_online_cpus();
 208                 break;
 209         case KVM_CAP_MAX_VCPUS:
 210                 r = KVM_MAX_VCPUS;
 211                 break;
 212         default:
 213                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
 214                 break;
 215         }
 216         return r;
 217 }
 218
 219 long kvm_arch_dev_ioctl(struct file *filp,
 220                         unsigned int ioctl, unsigned long arg)
 221 {
 222         return -EINVAL;
 223 }
 224
 225
 226 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 227 {
 228         int err;
 229         struct kvm_vcpu *vcpu;
 230
 231         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 232                 err = -EBUSY;
 233                 goto out;
 234         }
 235
 236         if (id >= kvm->arch.max_vcpus) {
 237                 err = -EINVAL;
 238                 goto out;
 239         }
 240
 241         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 242         if (!vcpu) {
 243                 err = -ENOMEM;
 244                 goto out;
 245         }
 246
 247         err = kvm_vcpu_init(vcpu, kvm, id);
 248         if (err)
 249                 goto free_vcpu;
 250
 251         err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 252         if (err)
 253                 goto vcpu_uninit;
 254
 255         return vcpu;
 256 vcpu_uninit:
 257         kvm_vcpu_uninit(vcpu);
 258 free_vcpu:
 259         kmem_cache_free(kvm_vcpu_cache, vcpu);
 260 out:
 261         return ERR_PTR(err);
 262 }
 263
 264 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 265 {
 266         kvm_vgic_vcpu_early_init(vcpu);
 267 }
 268
 269 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 270 {
 271         kvm_mmu_free_memory_caches(vcpu);
 272         kvm_timer_vcpu_terminate(vcpu);
 273         kvm_vgic_vcpu_destroy(vcpu);
 274         kvm_pmu_vcpu_destroy(vcpu);
 275         kvm_vcpu_uninit(vcpu);
 276         kmem_cache_free(kvm_vcpu_cache, vcpu);
 277 }
 278
 279 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 280 {
 281         kvm_arch_vcpu_free(vcpu);
 282 }
 283
 284 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 285 {
 286         return kvm_timer_should_fire(vcpu);
 287 }
 288
 289 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 290 {
 291         kvm_timer_schedule(vcpu);
 292 }
 293
 294 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 295 {
 296         kvm_timer_unschedule(vcpu);
 297 }
 298
 299 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 300 {
 301         /* Force users to call KVM_ARM_VCPU_INIT */
 302         vcpu->arch.target = -1;
 303         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 304
 305         /* Set up the timer */
 306         kvm_timer_vcpu_init(vcpu);
 307
 308         kvm_arm_reset_debug_ptr(vcpu);
 309
 310         return 0;
 311 }
 312
 313 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 314 {
 315         vcpu->cpu = cpu;
 316         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 317
 318         kvm_arm_set_running_vcpu(vcpu);
 319 }
 320
 321 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 322 {
 323         /*
 324          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 325          * if the vcpu is no longer assigned to a cpu.  This is used for the
 326          * optimized make_all_cpus_request path.
 327          */
 328         vcpu->cpu = -1;
 329
 330         kvm_arm_set_running_vcpu(NULL);
 331         kvm_timer_vcpu_put(vcpu);
 332 }
 333
 334 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 335                                     struct kvm_mp_state *mp_state)
 336 {
 337         if (vcpu->arch.power_off)
 338                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 339         else
 340                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 341
 342         return 0;
 343 }
 344
 345 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 346                                     struct kvm_mp_state *mp_state)
 347 {
 348         switch (mp_state->mp_state) {
 349         case KVM_MP_STATE_RUNNABLE:
 350                 vcpu->arch.power_off = false;
 351                 break;
 352         case KVM_MP_STATE_STOPPED:
 353                 vcpu->arch.power_off = true;
 354                 break;
 355         default:
 356                 return -EINVAL;
 357         }
 358
 359         return 0;
 360 }
 361
 362 /**
 363  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 364  * @v:          The VCPU pointer
 365  *
 366  * If the guest CPU is not waiting for interrupts or an interrupt line is
 367  * asserted, the CPU is by definition runnable.
 368  */
 369 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 370 {
 371         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 372                 && !v->arch.power_off && !v->arch.pause);
 373 }
 374
 375 /* Just ensure a guest exit from a particular CPU */
 376 static void exit_vm_noop(void *info)
 377 {
 378 }
 379
 380 void force_vm_exit(const cpumask_t *mask)
 381 {
 382         preempt_disable();
 383         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 384         preempt_enable();
 385 }
 386
 387 /**
 388  * need_new_vmid_gen - check that the VMID is still valid
 389  * @kvm: The VM's VMID to check
 390  *
 391  * return true if there is a new generation of VMIDs being used
 392  *
 393  * The hardware supports only 256 values with the value zero reserved for the
 394  * host, so we check if an assigned value belongs to a previous generation,
 395  * which which requires us to assign a new value. If we're the first to use a
 396  * VMID for the new generation, we must flush necessary caches and TLBs on all
 397  * CPUs.
 398  */
 399 static bool need_new_vmid_gen(struct kvm *kvm)
 400 {
 401         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 402 }
 403
 404 /**
 405  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 406  * @kvm The guest that we are about to run
 407  *
 408  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 409  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 410  * caches and TLBs.
 411  */
 412 static void update_vttbr(struct kvm *kvm)
 413 {
 414         phys_addr_t pgd_phys;
 415         u64 vmid;
 416
 417         if (!need_new_vmid_gen(kvm))
 418                 return;
 419
 420         spin_lock(&kvm_vmid_lock);
 421
 422         /*
 423          * We need to re-check the vmid_gen here to ensure that if another vcpu
 424          * already allocated a valid vmid for this vm, then this vcpu should
 425          * use the same vmid.
 426          */
 427         if (!need_new_vmid_gen(kvm)) {
 428                 spin_unlock(&kvm_vmid_lock);
 429                 return;
 430         }
 431
 432         /* First user of a new VMID generation? */
 433         if (unlikely(kvm_next_vmid == 0)) {
 434                 atomic64_inc(&kvm_vmid_gen);
 435                 kvm_next_vmid = 1;
 436
 437                 /*
 438                  * On SMP we know no other CPUs can use this CPU's or each
 439                  * other's VMID after force_vm_exit returns since the
 440                  * kvm_vmid_lock blocks them from reentry to the guest.
 441                  */
 442                 force_vm_exit(cpu_all_mask);
 443                 /*
 444                  * Now broadcast TLB + ICACHE invalidation over the inner
 445                  * shareable domain to make sure all data structures are
 446                  * clean.
 447                  */
 448                 kvm_call_hyp(__kvm_flush_vm_context);
 449         }
 450
 451         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 452         kvm->arch.vmid = kvm_next_vmid;
 453         kvm_next_vmid++;
 454         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 455
 456         /* update vttbr to be used with the new vmid */
 457         pgd_phys = virt_to_phys(kvm->arch.pgd);
 458         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 459         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 460         kvm->arch.vttbr = pgd_phys | vmid;
 461
 462         spin_unlock(&kvm_vmid_lock);
 463 }
 464
 465 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 466 {
 467         struct kvm *kvm = vcpu->kvm;
 468         int ret = 0;
 469
 470         if (likely(vcpu->arch.has_run_once))
 471                 return 0;
 472
 473         vcpu->arch.has_run_once = true;
 474
 475         /*
 476          * Map the VGIC hardware resources before running a vcpu the first
 477          * time on this VM.
 478          */
 479         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 480                 ret = kvm_vgic_map_resources(kvm);
 481                 if (ret)
 482                         return ret;
 483         }
 484
 485         /*
 486          * Enable the arch timers only if we have an in-kernel VGIC
 487          * and it has been properly initialized, since we cannot handle
 488          * interrupts from the virtual timer with a userspace gic.
 489          */
 490         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 491                 ret = kvm_timer_enable(vcpu);
 492
 493         return ret;
 494 }
 495
 496 bool kvm_arch_intc_initialized(struct kvm *kvm)
 497 {
 498         return vgic_initialized(kvm);
 499 }
 500
 501 void kvm_arm_halt_guest(struct kvm *kvm)
 502 {
 503         int i;
 504         struct kvm_vcpu *vcpu;
 505
 506         kvm_for_each_vcpu(i, vcpu, kvm)
 507                 vcpu->arch.pause = true;
 508         kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
 509 }
 510
 511 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
 512 {
 513         vcpu->arch.pause = true;
 514         kvm_vcpu_kick(vcpu);
 515 }
 516
 517 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
 518 {
 519         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 520
 521         vcpu->arch.pause = false;
 522         swake_up(wq);
 523 }
 524
 525 void kvm_arm_resume_guest(struct kvm *kvm)
 526 {
 527         int i;
 528         struct kvm_vcpu *vcpu;
 529
 530         kvm_for_each_vcpu(i, vcpu, kvm)
 531                 kvm_arm_resume_vcpu(vcpu);
 532 }
 533
 534 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 535 {
 536         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 537
 538         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 539                                        (!vcpu->arch.pause)));
 540 }
 541
 542 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 543 {
 544         return vcpu->arch.target >= 0;
 545 }
 546
 547 /**
 548  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 549  * @vcpu:       The VCPU pointer
 550  * @run:        The kvm_run structure pointer used for userspace state exchange
 551  *
 552  * This function is called through the VCPU_RUN ioctl called from user space. It
 553  * will execute VM code in a loop until the time slice for the process is used
 554  * or some emulation is needed from user space in which case the function will
 555  * return with return value 0 and with the kvm_run structure filled in with the
 556  * required data for the requested emulation.
 557  */
 558 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 559 {
 560         int ret;
 561         sigset_t sigsaved;
 562
 563         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 564                 return -ENOEXEC;
 565
 566         ret = kvm_vcpu_first_run_init(vcpu);
 567         if (ret)
 568                 return ret;
 569
 570         if (run->exit_reason == KVM_EXIT_MMIO) {
 571                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 572                 if (ret)
 573                         return ret;
 574         }
 575
 576         if (vcpu->sigset_active)
 577                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 578
 579         ret = 1;
 580         run->exit_reason = KVM_EXIT_UNKNOWN;
 581         while (ret > 0) {
 582                 /*
 583                  * Check conditions before entering the guest
 584                  */
 585                 cond_resched();
 586
 587                 update_vttbr(vcpu->kvm);
 588
 589                 if (vcpu->arch.power_off || vcpu->arch.pause)
 590                         vcpu_sleep(vcpu);
 591
 592                 /*
 593                  * Preparing the interrupts to be injected also
 594                  * involves poking the GIC, which must be done in a
 595                  * non-preemptible context.
 596                  */
 597                 preempt_disable();
 598                 kvm_pmu_flush_hwstate(vcpu);
 599                 kvm_timer_flush_hwstate(vcpu);
 600                 kvm_vgic_flush_hwstate(vcpu);
 601
 602                 local_irq_disable();
 603
 604                 /*
 605                  * Re-check atomic conditions
 606                  */
 607                 if (signal_pending(current)) {
 608                         ret = -EINTR;
 609                         run->exit_reason = KVM_EXIT_INTR;
 610                 }
 611
 612                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 613                         vcpu->arch.power_off || vcpu->arch.pause) {
 614                         local_irq_enable();
 615                         kvm_pmu_sync_hwstate(vcpu);
 616                         kvm_timer_sync_hwstate(vcpu);
 617                         kvm_vgic_sync_hwstate(vcpu);
 618                         preempt_enable();
 619                         continue;
 620                 }
 621
 622                 kvm_arm_setup_debug(vcpu);
 623
 624                 /**************************************************************
 625                  * Enter the guest
 626                  */
 627                 trace_kvm_entry(*vcpu_pc(vcpu));
 628                 guest_enter_irqoff();
 629                 vcpu->mode = IN_GUEST_MODE;
 630
 631                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 632
 633                 vcpu->mode = OUTSIDE_GUEST_MODE;
 634                 vcpu->stat.exits++;
 635                 /*
 636                  * Back from guest
 637                  *************************************************************/
 638
 639                 kvm_arm_clear_debug(vcpu);
 640
 641                 /*
 642                  * We may have taken a host interrupt in HYP mode (ie
 643                  * while executing the guest). This interrupt is still
 644                  * pending, as we haven't serviced it yet!
 645                  *
 646                  * We're now back in SVC mode, with interrupts
 647                  * disabled.  Enabling the interrupts now will have
 648                  * the effect of taking the interrupt again, in SVC
 649                  * mode this time.
 650                  */
 651                 local_irq_enable();
 652
 653                 /*
 654                  * We do local_irq_enable() before calling guest_exit() so
 655                  * that if a timer interrupt hits while running the guest we
 656                  * account that tick as being spent in the guest.  We enable
 657                  * preemption after calling guest_exit() so that if we get
 658                  * preempted we make sure ticks after that is not counted as
 659                  * guest time.
 660                  */
 661                 guest_exit();
 662                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 663
 664                 /*
 665                  * We must sync the PMU and timer state before the vgic state so
 666                  * that the vgic can properly sample the updated state of the
 667                  * interrupt line.
 668                  */
 669                 kvm_pmu_sync_hwstate(vcpu);
 670                 kvm_timer_sync_hwstate(vcpu);
 671
 672                 kvm_vgic_sync_hwstate(vcpu);
 673
 674                 preempt_enable();
 675
 676                 ret = handle_exit(vcpu, run, ret);
 677         }
 678
 679         if (vcpu->sigset_active)
 680                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 681         return ret;
 682 }
 683
 684 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 685 {
 686         int bit_index;
 687         bool set;
 688         unsigned long *ptr;
 689
 690         if (number == KVM_ARM_IRQ_CPU_IRQ)
 691                 bit_index = __ffs(HCR_VI);
 692         else /* KVM_ARM_IRQ_CPU_FIQ */
 693                 bit_index = __ffs(HCR_VF);
 694
 695         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 696         if (level)
 697                 set = test_and_set_bit(bit_index, ptr);
 698         else
 699                 set = test_and_clear_bit(bit_index, ptr);
 700
 701         /*
 702          * If we didn't change anything, no need to wake up or kick other CPUs
 703          */
 704         if (set == level)
 705                 return 0;
 706
 707         /*
 708          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 709          * trigger a world-switch round on the running physical CPU to set the
 710          * virtual IRQ/FIQ fields in the HCR appropriately.
 711          */
 712         kvm_vcpu_kick(vcpu);
 713
 714         return 0;
 715 }
 716
 717 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 718                           bool line_status)
 719 {
 720         u32 irq = irq_level->irq;
 721         unsigned int irq_type, vcpu_idx, irq_num;
 722         int nrcpus = atomic_read(&kvm->online_vcpus);
 723         struct kvm_vcpu *vcpu = NULL;
 724         bool level = irq_level->level;
 725
 726         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 727         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 728         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 729
 730         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 731
 732         switch (irq_type) {
 733         case KVM_ARM_IRQ_TYPE_CPU:
 734                 if (irqchip_in_kernel(kvm))
 735                         return -ENXIO;
 736
 737                 if (vcpu_idx >= nrcpus)
 738                         return -EINVAL;
 739
 740                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 741                 if (!vcpu)
 742                         return -EINVAL;
 743
 744                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 745                         return -EINVAL;
 746
 747                 return vcpu_interrupt_line(vcpu, irq_num, level);
 748         case KVM_ARM_IRQ_TYPE_PPI:
 749                 if (!irqchip_in_kernel(kvm))
 750                         return -ENXIO;
 751
 752                 if (vcpu_idx >= nrcpus)
 753                         return -EINVAL;
 754
 755                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 756                 if (!vcpu)
 757                         return -EINVAL;
 758
 759                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 760                         return -EINVAL;
 761
 762                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 763         case KVM_ARM_IRQ_TYPE_SPI:
 764                 if (!irqchip_in_kernel(kvm))
 765                         return -ENXIO;
 766
 767                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 768                         return -EINVAL;
 769
 770                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 771         }
 772
 773         return -EINVAL;
 774 }
 775
 776 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 777                                const struct kvm_vcpu_init *init)
 778 {
 779         unsigned int i;
 780         int phys_target = kvm_target_cpu();
 781
 782         if (init->target != phys_target)
 783                 return -EINVAL;
 784
 785         /*
 786          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 787          * use the same target.
 788          */
 789         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 790                 return -EINVAL;
 791
 792         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 793         for (i = 0; i < sizeof(init->features) * 8; i++) {
 794                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 795
 796                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 797                         return -ENOENT;
 798
 799                 /*
 800                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 801                  * use the same feature set.
 802                  */
 803                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 804                     test_bit(i, vcpu->arch.features) != set)
 805                         return -EINVAL;
 806
 807                 if (set)
 808                         set_bit(i, vcpu->arch.features);
 809         }
 810
 811         vcpu->arch.target = phys_target;
 812
 813         /* Now we know what it is, we can reset it. */
 814         return kvm_reset_vcpu(vcpu);
 815 }
 816
 817
 818 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 819                                          struct kvm_vcpu_init *init)
 820 {
 821         int ret;
 822
 823         ret = kvm_vcpu_set_target(vcpu, init);
 824         if (ret)
 825                 return ret;
 826
 827         /*
 828          * Ensure a rebooted VM will fault in RAM pages and detect if the
 829          * guest MMU is turned off and flush the caches as needed.
 830          */
 831         if (vcpu->arch.has_run_once)
 832                 stage2_unmap_vm(vcpu->kvm);
 833
 834         vcpu_reset_hcr(vcpu);
 835
 836         /*
 837          * Handle the "start in power-off" case.
 838          */
 839         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 840                 vcpu->arch.power_off = true;
 841         else
 842                 vcpu->arch.power_off = false;
 843
 844         return 0;
 845 }
 846
 847 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 848                                  struct kvm_device_attr *attr)
 849 {
 850         int ret = -ENXIO;
 851
 852         switch (attr->group) {
 853         default:
 854                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 855                 break;
 856         }
 857
 858         return ret;
 859 }
 860
 861 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 862                                  struct kvm_device_attr *attr)
 863 {
 864         int ret = -ENXIO;
 865
 866         switch (attr->group) {
 867         default:
 868                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 869                 break;
 870         }
 871
 872         return ret;
 873 }
 874
 875 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 876                                  struct kvm_device_attr *attr)
 877 {
 878         int ret = -ENXIO;
 879
 880         switch (attr->group) {
 881         default:
 882                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 883                 break;
 884         }
 885
 886         return ret;
 887 }
 888
 889 long kvm_arch_vcpu_ioctl(struct file *filp,
 890                          unsigned int ioctl, unsigned long arg)
 891 {
 892         struct kvm_vcpu *vcpu = filp->private_data;
 893         void __user *argp = (void __user *)arg;
 894         struct kvm_device_attr attr;
 895
 896         switch (ioctl) {
 897         case KVM_ARM_VCPU_INIT: {
 898                 struct kvm_vcpu_init init;
 899
 900                 if (copy_from_user(&init, argp, sizeof(init)))
 901                         return -EFAULT;
 902
 903                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 904         }
 905         case KVM_SET_ONE_REG:
 906         case KVM_GET_ONE_REG: {
 907                 struct kvm_one_reg reg;
 908
 909                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 910                         return -ENOEXEC;
 911
 912                 if (copy_from_user(&reg, argp, sizeof(reg)))
 913                         return -EFAULT;
 914                 if (ioctl == KVM_SET_ONE_REG)
 915                         return kvm_arm_set_reg(vcpu, &reg);
 916                 else
 917                         return kvm_arm_get_reg(vcpu, &reg);
 918         }
 919         case KVM_GET_REG_LIST: {
 920                 struct kvm_reg_list __user *user_list = argp;
 921                 struct kvm_reg_list reg_list;
 922                 unsigned n;
 923
 924                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 925                         return -ENOEXEC;
 926
 927                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 928                         return -EFAULT;
 929                 n = reg_list.n;
 930                 reg_list.n = kvm_arm_num_regs(vcpu);
 931                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 932                         return -EFAULT;
 933                 if (n < reg_list.n)
 934                         return -E2BIG;
 935                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 936         }
 937         case KVM_SET_DEVICE_ATTR: {
 938                 if (copy_from_user(&attr, argp, sizeof(attr)))
 939                         return -EFAULT;
 940                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 941         }
 942         case KVM_GET_DEVICE_ATTR: {
 943                 if (copy_from_user(&attr, argp, sizeof(attr)))
 944                         return -EFAULT;
 945                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 946         }
 947         case KVM_HAS_DEVICE_ATTR: {
 948                 if (copy_from_user(&attr, argp, sizeof(attr)))
 949                         return -EFAULT;
 950                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 951         }
 952         default:
 953                 return -EINVAL;
 954         }
 955 }
 956
 957 /**
 958  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 959  * @kvm: kvm instance
 960  * @log: slot id and address to which we copy the log
 961  *
 962  * Steps 1-4 below provide general overview of dirty page logging. See
 963  * kvm_get_dirty_log_protect() function description for additional details.
 964  *
 965  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 966  * always flush the TLB (step 4) even if previous step failed  and the dirty
 967  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 968  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 969  * writes will be marked dirty for next log read.
 970  *
 971  *   1. Take a snapshot of the bit and clear it if needed.
 972  *   2. Write protect the corresponding page.
 973  *   3. Copy the snapshot to the userspace.
 974  *   4. Flush TLB's if needed.
 975  */
 976 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 977 {
 978         bool is_dirty = false;
 979         int r;
 980
 981         mutex_lock(&kvm->slots_lock);
 982
 983         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 984
 985         if (is_dirty)
 986                 kvm_flush_remote_tlbs(kvm);
 987
 988         mutex_unlock(&kvm->slots_lock);
 989         return r;
 990 }
 991
 992 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 993                                         struct kvm_arm_device_addr *dev_addr)
 994 {
 995         unsigned long dev_id, type;
 996
 997         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 998                 KVM_ARM_DEVICE_ID_SHIFT;
 999         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1000                 KVM_ARM_DEVICE_TYPE_SHIFT;
1001
1002         switch (dev_id) {
1003         case KVM_ARM_DEVICE_VGIC_V2:
1004                 if (!vgic_present)
1005                         return -ENXIO;
1006                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1007         default:
1008                 return -ENODEV;
1009         }
1010 }
1011
1012 long kvm_arch_vm_ioctl(struct file *filp,
1013                        unsigned int ioctl, unsigned long arg)
1014 {
1015         struct kvm *kvm = filp->private_data;
1016         void __user *argp = (void __user *)arg;
1017
1018         switch (ioctl) {
1019         case KVM_CREATE_IRQCHIP: {
1020                 int ret;
1021                 if (!vgic_present)
1022                         return -ENXIO;
1023                 mutex_lock(&kvm->lock);
1024                 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1025                 mutex_unlock(&kvm->lock);
1026                 return ret;
1027         }
1028         case KVM_ARM_SET_DEVICE_ADDR: {
1029                 struct kvm_arm_device_addr dev_addr;
1030
1031                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1032                         return -EFAULT;
1033                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1034         }
1035         case KVM_ARM_PREFERRED_TARGET: {
1036                 int err;
1037                 struct kvm_vcpu_init init;
1038
1039                 err = kvm_vcpu_preferred_target(&init);
1040                 if (err)
1041                         return err;
1042
1043                 if (copy_to_user(argp, &init, sizeof(init)))
1044                         return -EFAULT;
1045
1046                 return 0;
1047         }
1048         default:
1049                 return -EINVAL;
1050         }
1051 }
1052
1053 static void cpu_init_hyp_mode(void *dummy)
1054 {
1055         phys_addr_t pgd_ptr;
1056         unsigned long hyp_stack_ptr;
1057         unsigned long stack_page;
1058         unsigned long vector_ptr;
1059
1060         /* Switch from the HYP stub to our own HYP init vector */
1061         __hyp_set_vectors(kvm_get_idmap_vector());
1062
1063         pgd_ptr = kvm_mmu_get_httbr();
1064         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1065         hyp_stack_ptr = stack_page + PAGE_SIZE;
1066         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1067
1068         __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1069         __cpu_init_stage2();
1070
1071         kvm_arm_init_debug();
1072 }
1073
1074 static void cpu_hyp_reinit(void)
1075 {
1076         if (is_kernel_in_hyp_mode()) {
1077                 /*
1078                  * __cpu_init_stage2() is safe to call even if the PM
1079                  * event was cancelled before the CPU was reset.
1080                  */
1081                 __cpu_init_stage2();
1082         } else {
1083                 if (__hyp_get_vectors() == hyp_default_vectors)
1084                         cpu_init_hyp_mode(NULL);
1085         }
1086 }
1087
1088 static void cpu_hyp_reset(void)
1089 {
1090         if (!is_kernel_in_hyp_mode())
1091                 __cpu_reset_hyp_mode(hyp_default_vectors,
1092                                      kvm_get_idmap_start());
1093 }
1094
1095 static void _kvm_arch_hardware_enable(void *discard)
1096 {
1097         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1098                 cpu_hyp_reinit();
1099                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1100         }
1101 }
1102
1103 int kvm_arch_hardware_enable(void)
1104 {
1105         _kvm_arch_hardware_enable(NULL);
1106         return 0;
1107 }
1108
1109 static void _kvm_arch_hardware_disable(void *discard)
1110 {
1111         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1112                 cpu_hyp_reset();
1113                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1114         }
1115 }
1116
1117 void kvm_arch_hardware_disable(void)
1118 {
1119         _kvm_arch_hardware_disable(NULL);
1120 }
1121
1122 #ifdef CONFIG_CPU_PM
1123 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1124                                     unsigned long cmd,
1125                                     void *v)
1126 {
1127         /*
1128          * kvm_arm_hardware_enabled is left with its old value over
1129          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1130          * re-enable hyp.
1131          */
1132         switch (cmd) {
1133         case CPU_PM_ENTER:
1134                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1135                         /*
1136                          * don't update kvm_arm_hardware_enabled here
1137                          * so that the hardware will be re-enabled
1138                          * when we resume. See below.
1139                          */
1140                         cpu_hyp_reset();
1141
1142                 return NOTIFY_OK;
1143         case CPU_PM_EXIT:
1144                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1145                         /* The hardware was enabled before suspend. */
1146                         cpu_hyp_reinit();
1147
1148                 return NOTIFY_OK;
1149
1150         default:
1151                 return NOTIFY_DONE;
1152         }
1153 }
1154
1155 static struct notifier_block hyp_init_cpu_pm_nb = {
1156         .notifier_call = hyp_init_cpu_pm_notifier,
1157 };
1158
1159 static void __init hyp_cpu_pm_init(void)
1160 {
1161         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1162 }
1163 static void __init hyp_cpu_pm_exit(void)
1164 {
1165         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1166 }
1167 #else
1168 static inline void hyp_cpu_pm_init(void)
1169 {
1170 }
1171 static inline void hyp_cpu_pm_exit(void)
1172 {
1173 }
1174 #endif
1175
1176 static void teardown_common_resources(void)
1177 {
1178         free_percpu(kvm_host_cpu_state);
1179 }
1180
1181 static int init_common_resources(void)
1182 {
1183         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1184         if (!kvm_host_cpu_state) {
1185                 kvm_err("Cannot allocate host CPU state\n");
1186                 return -ENOMEM;
1187         }
1188
1189         /* set size of VMID supported by CPU */
1190         kvm_vmid_bits = kvm_get_vmid_bits();
1191         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1192
1193         return 0;
1194 }
1195
1196 static int init_subsystems(void)
1197 {
1198         int err = 0;
1199
1200         /*
1201          * Enable hardware so that subsystem initialisation can access EL2.
1202          */
1203         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1204
1205         /*
1206          * Register CPU lower-power notifier
1207          */
1208         hyp_cpu_pm_init();
1209
1210         /*
1211          * Init HYP view of VGIC
1212          */
1213         err = kvm_vgic_hyp_init();
1214         switch (err) {
1215         case 0:
1216                 vgic_present = true;
1217                 break;
1218         case -ENODEV:
1219         case -ENXIO:
1220                 vgic_present = false;
1221                 err = 0;
1222                 break;
1223         default:
1224                 goto out;
1225         }
1226
1227         /*
1228          * Init HYP architected timer support
1229          */
1230         err = kvm_timer_hyp_init();
1231         if (err)
1232                 goto out;
1233
1234         kvm_perf_init();
1235         kvm_coproc_table_init();
1236
1237 out:
1238         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1239
1240         return err;
1241 }
1242
1243 static void teardown_hyp_mode(void)
1244 {
1245         int cpu;
1246
1247         if (is_kernel_in_hyp_mode())
1248                 return;
1249
1250         free_hyp_pgds();
1251         for_each_possible_cpu(cpu)
1252                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1253         hyp_cpu_pm_exit();
1254 }
1255
1256 static int init_vhe_mode(void)
1257 {
1258         kvm_info("VHE mode initialized successfully\n");
1259         return 0;
1260 }
1261
1262 /**
1263  * Inits Hyp-mode on all online CPUs
1264  */
1265 static int init_hyp_mode(void)
1266 {
1267         int cpu;
1268         int err = 0;
1269
1270         /*
1271          * Allocate Hyp PGD and setup Hyp identity mapping
1272          */
1273         err = kvm_mmu_init();
1274         if (err)
1275                 goto out_err;
1276
1277         /*
1278          * It is probably enough to obtain the default on one
1279          * CPU. It's unlikely to be different on the others.
1280          */
1281         hyp_default_vectors = __hyp_get_vectors();
1282
1283         /*
1284          * Allocate stack pages for Hypervisor-mode
1285          */
1286         for_each_possible_cpu(cpu) {
1287                 unsigned long stack_page;
1288
1289                 stack_page = __get_free_page(GFP_KERNEL);
1290                 if (!stack_page) {
1291                         err = -ENOMEM;
1292                         goto out_err;
1293                 }
1294
1295                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1296         }
1297
1298         /*
1299          * Map the Hyp-code called directly from the host
1300          */
1301         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1302                                   kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1303         if (err) {
1304                 kvm_err("Cannot map world-switch code\n");
1305                 goto out_err;
1306         }
1307
1308         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1309                                   kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1310         if (err) {
1311                 kvm_err("Cannot map rodata section\n");
1312                 goto out_err;
1313         }
1314
1315         /*
1316          * Map the Hyp stack pages
1317          */
1318         for_each_possible_cpu(cpu) {
1319                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1320                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1321                                           PAGE_HYP);
1322
1323                 if (err) {
1324                         kvm_err("Cannot map hyp stack\n");
1325                         goto out_err;
1326                 }
1327         }
1328
1329         for_each_possible_cpu(cpu) {
1330                 kvm_cpu_context_t *cpu_ctxt;
1331
1332                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1333                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1334
1335                 if (err) {
1336                         kvm_err("Cannot map host CPU state: %d\n", err);
1337                         goto out_err;
1338                 }
1339         }
1340
1341         kvm_info("Hyp mode initialized successfully\n");
1342
1343         return 0;
1344
1345 out_err:
1346         teardown_hyp_mode();
1347         kvm_err("error initializing Hyp mode: %d\n", err);
1348         return err;
1349 }
1350
1351 static void check_kvm_target_cpu(void *ret)
1352 {
1353         *(int *)ret = kvm_target_cpu();
1354 }
1355
1356 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1357 {
1358         struct kvm_vcpu *vcpu;
1359         int i;
1360
1361         mpidr &= MPIDR_HWID_BITMASK;
1362         kvm_for_each_vcpu(i, vcpu, kvm) {
1363                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1364                         return vcpu;
1365         }
1366         return NULL;
1367 }
1368
1369 /**
1370  * Initialize Hyp-mode and memory mappings on all CPUs.
1371  */
1372 int kvm_arch_init(void *opaque)
1373 {
1374         int err;
1375         int ret, cpu;
1376
1377         if (!is_hyp_mode_available()) {
1378                 kvm_err("HYP mode not available\n");
1379                 return -ENODEV;
1380         }
1381
1382         for_each_online_cpu(cpu) {
1383                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1384                 if (ret < 0) {
1385                         kvm_err("Error, CPU %d not supported!\n", cpu);
1386                         return -ENODEV;
1387                 }
1388         }
1389
1390         err = init_common_resources();
1391         if (err)
1392                 return err;
1393
1394         if (is_kernel_in_hyp_mode())
1395                 err = init_vhe_mode();
1396         else
1397                 err = init_hyp_mode();
1398         if (err)
1399                 goto out_err;
1400
1401         err = init_subsystems();
1402         if (err)
1403                 goto out_hyp;
1404
1405         return 0;
1406
1407 out_hyp:
1408         teardown_hyp_mode();
1409 out_err:
1410         teardown_common_resources();
1411         return err;
1412 }
1413
1414 /* NOP: Compiling as a module not supported */
1415 void kvm_arch_exit(void)
1416 {
1417         kvm_perf_teardown();
1418 }
1419
1420 static int arm_init(void)
1421 {
1422         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1423         return rc;
1424 }
1425
1426 module_init(arm_init);