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 <linux/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, cpu;
 118
 119         if (type)
 120                 return -EINVAL;
 121
 122         kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
 123         if (!kvm->arch.last_vcpu_ran)
 124                 return -ENOMEM;
 125
 126         for_each_possible_cpu(cpu)
 127                 *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
 128
 129         ret = kvm_alloc_stage2_pgd(kvm);
 130         if (ret)
 131                 goto out_fail_alloc;
 132
 133         ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
 134         if (ret)
 135                 goto out_free_stage2_pgd;
 136
 137         kvm_vgic_early_init(kvm);
 138
 139         /* Mark the initial VMID generation invalid */
 140         kvm->arch.vmid_gen = 0;
 141
 142         /* The maximum number of VCPUs is limited by the host's GIC model */
 143         kvm->arch.max_vcpus = vgic_present ?
 144                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 145
 146         return ret;
 147 out_free_stage2_pgd:
 148         kvm_free_stage2_pgd(kvm);
 149 out_fail_alloc:
 150         free_percpu(kvm->arch.last_vcpu_ran);
 151         kvm->arch.last_vcpu_ran = NULL;
 152         return ret;
 153 }
 154
 155 bool kvm_arch_has_vcpu_debugfs(void)
 156 {
 157         return false;
 158 }
 159
 160 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
 161 {
 162         return 0;
 163 }
 164
 165 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 166 {
 167         return VM_FAULT_SIGBUS;
 168 }
 169
 170
 171 /**
 172  * kvm_arch_destroy_vm - destroy the VM data structure
 173  * @kvm:        pointer to the KVM struct
 174  */
 175 void kvm_arch_destroy_vm(struct kvm *kvm)
 176 {
 177         int i;
 178
 179         free_percpu(kvm->arch.last_vcpu_ran);
 180         kvm->arch.last_vcpu_ran = NULL;
 181
 182         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 183                 if (kvm->vcpus[i]) {
 184                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 185                         kvm->vcpus[i] = NULL;
 186                 }
 187         }
 188
 189         kvm_vgic_destroy(kvm);
 190 }
 191
 192 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 193 {
 194         int r;
 195         switch (ext) {
 196         case KVM_CAP_IRQCHIP:
 197                 r = vgic_present;
 198                 break;
 199         case KVM_CAP_IOEVENTFD:
 200         case KVM_CAP_DEVICE_CTRL:
 201         case KVM_CAP_USER_MEMORY:
 202         case KVM_CAP_SYNC_MMU:
 203         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 204         case KVM_CAP_ONE_REG:
 205         case KVM_CAP_ARM_PSCI:
 206         case KVM_CAP_ARM_PSCI_0_2:
 207         case KVM_CAP_READONLY_MEM:
 208         case KVM_CAP_MP_STATE:
 209         case KVM_CAP_IMMEDIATE_EXIT:
 210                 r = 1;
 211                 break;
 212         case KVM_CAP_COALESCED_MMIO:
 213                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 214                 break;
 215         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 216                 r = 1;
 217                 break;
 218         case KVM_CAP_NR_VCPUS:
 219                 r = num_online_cpus();
 220                 break;
 221         case KVM_CAP_MAX_VCPUS:
 222                 r = KVM_MAX_VCPUS;
 223                 break;
 224         case KVM_CAP_MSI_DEVID:
 225                 if (!kvm)
 226                         r = -EINVAL;
 227                 else
 228                         r = kvm->arch.vgic.msis_require_devid;
 229                 break;
 230         default:
 231                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
 232                 break;
 233         }
 234         return r;
 235 }
 236
 237 long kvm_arch_dev_ioctl(struct file *filp,
 238                         unsigned int ioctl, unsigned long arg)
 239 {
 240         return -EINVAL;
 241 }
 242
 243
 244 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 245 {
 246         int err;
 247         struct kvm_vcpu *vcpu;
 248
 249         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 250                 err = -EBUSY;
 251                 goto out;
 252         }
 253
 254         if (id >= kvm->arch.max_vcpus) {
 255                 err = -EINVAL;
 256                 goto out;
 257         }
 258
 259         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 260         if (!vcpu) {
 261                 err = -ENOMEM;
 262                 goto out;
 263         }
 264
 265         err = kvm_vcpu_init(vcpu, kvm, id);
 266         if (err)
 267                 goto free_vcpu;
 268
 269         err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
 270         if (err)
 271                 goto vcpu_uninit;
 272
 273         return vcpu;
 274 vcpu_uninit:
 275         kvm_vcpu_uninit(vcpu);
 276 free_vcpu:
 277         kmem_cache_free(kvm_vcpu_cache, vcpu);
 278 out:
 279         return ERR_PTR(err);
 280 }
 281
 282 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 283 {
 284         kvm_vgic_vcpu_early_init(vcpu);
 285 }
 286
 287 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 288 {
 289         kvm_mmu_free_memory_caches(vcpu);
 290         kvm_timer_vcpu_terminate(vcpu);
 291         kvm_vgic_vcpu_destroy(vcpu);
 292         kvm_pmu_vcpu_destroy(vcpu);
 293         kvm_vcpu_uninit(vcpu);
 294         kmem_cache_free(kvm_vcpu_cache, vcpu);
 295 }
 296
 297 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 298 {
 299         kvm_arch_vcpu_free(vcpu);
 300 }
 301
 302 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 303 {
 304         return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
 305                kvm_timer_should_fire(vcpu_ptimer(vcpu));
 306 }
 307
 308 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 309 {
 310         kvm_timer_schedule(vcpu);
 311 }
 312
 313 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 314 {
 315         kvm_timer_unschedule(vcpu);
 316 }
 317
 318 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 319 {
 320         /* Force users to call KVM_ARM_VCPU_INIT */
 321         vcpu->arch.target = -1;
 322         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 323
 324         /* Set up the timer */
 325         kvm_timer_vcpu_init(vcpu);
 326
 327         kvm_arm_reset_debug_ptr(vcpu);
 328
 329         return 0;
 330 }
 331
 332 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 333 {
 334         int *last_ran;
 335
 336         last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
 337
 338         /*
 339          * We might get preempted before the vCPU actually runs, but
 340          * over-invalidation doesn't affect correctness.
 341          */
 342         if (*last_ran != vcpu->vcpu_id) {
 343                 kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
 344                 *last_ran = vcpu->vcpu_id;
 345         }
 346
 347         vcpu->cpu = cpu;
 348         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 349
 350         kvm_arm_set_running_vcpu(vcpu);
 351 }
 352
 353 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 354 {
 355         /*
 356          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 357          * if the vcpu is no longer assigned to a cpu.  This is used for the
 358          * optimized make_all_cpus_request path.
 359          */
 360         vcpu->cpu = -1;
 361
 362         kvm_arm_set_running_vcpu(NULL);
 363         kvm_timer_vcpu_put(vcpu);
 364 }
 365
 366 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 367                                     struct kvm_mp_state *mp_state)
 368 {
 369         if (vcpu->arch.power_off)
 370                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 371         else
 372                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 373
 374         return 0;
 375 }
 376
 377 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 378                                     struct kvm_mp_state *mp_state)
 379 {
 380         switch (mp_state->mp_state) {
 381         case KVM_MP_STATE_RUNNABLE:
 382                 vcpu->arch.power_off = false;
 383                 break;
 384         case KVM_MP_STATE_STOPPED:
 385                 vcpu->arch.power_off = true;
 386                 break;
 387         default:
 388                 return -EINVAL;
 389         }
 390
 391         return 0;
 392 }
 393
 394 /**
 395  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 396  * @v:          The VCPU pointer
 397  *
 398  * If the guest CPU is not waiting for interrupts or an interrupt line is
 399  * asserted, the CPU is by definition runnable.
 400  */
 401 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 402 {
 403         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 404                 && !v->arch.power_off && !v->arch.pause);
 405 }
 406
 407 /* Just ensure a guest exit from a particular CPU */
 408 static void exit_vm_noop(void *info)
 409 {
 410 }
 411
 412 void force_vm_exit(const cpumask_t *mask)
 413 {
 414         preempt_disable();
 415         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 416         preempt_enable();
 417 }
 418
 419 /**
 420  * need_new_vmid_gen - check that the VMID is still valid
 421  * @kvm: The VM's VMID to check
 422  *
 423  * return true if there is a new generation of VMIDs being used
 424  *
 425  * The hardware supports only 256 values with the value zero reserved for the
 426  * host, so we check if an assigned value belongs to a previous generation,
 427  * which which requires us to assign a new value. If we're the first to use a
 428  * VMID for the new generation, we must flush necessary caches and TLBs on all
 429  * CPUs.
 430  */
 431 static bool need_new_vmid_gen(struct kvm *kvm)
 432 {
 433         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 434 }
 435
 436 /**
 437  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 438  * @kvm The guest that we are about to run
 439  *
 440  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 441  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 442  * caches and TLBs.
 443  */
 444 static void update_vttbr(struct kvm *kvm)
 445 {
 446         phys_addr_t pgd_phys;
 447         u64 vmid;
 448
 449         if (!need_new_vmid_gen(kvm))
 450                 return;
 451
 452         spin_lock(&kvm_vmid_lock);
 453
 454         /*
 455          * We need to re-check the vmid_gen here to ensure that if another vcpu
 456          * already allocated a valid vmid for this vm, then this vcpu should
 457          * use the same vmid.
 458          */
 459         if (!need_new_vmid_gen(kvm)) {
 460                 spin_unlock(&kvm_vmid_lock);
 461                 return;
 462         }
 463
 464         /* First user of a new VMID generation? */
 465         if (unlikely(kvm_next_vmid == 0)) {
 466                 atomic64_inc(&kvm_vmid_gen);
 467                 kvm_next_vmid = 1;
 468
 469                 /*
 470                  * On SMP we know no other CPUs can use this CPU's or each
 471                  * other's VMID after force_vm_exit returns since the
 472                  * kvm_vmid_lock blocks them from reentry to the guest.
 473                  */
 474                 force_vm_exit(cpu_all_mask);
 475                 /*
 476                  * Now broadcast TLB + ICACHE invalidation over the inner
 477                  * shareable domain to make sure all data structures are
 478                  * clean.
 479                  */
 480                 kvm_call_hyp(__kvm_flush_vm_context);
 481         }
 482
 483         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 484         kvm->arch.vmid = kvm_next_vmid;
 485         kvm_next_vmid++;
 486         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 487
 488         /* update vttbr to be used with the new vmid */
 489         pgd_phys = virt_to_phys(kvm->arch.pgd);
 490         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 491         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 492         kvm->arch.vttbr = pgd_phys | vmid;
 493
 494         spin_unlock(&kvm_vmid_lock);
 495 }
 496
 497 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 498 {
 499         struct kvm *kvm = vcpu->kvm;
 500         int ret = 0;
 501
 502         if (likely(vcpu->arch.has_run_once))
 503                 return 0;
 504
 505         vcpu->arch.has_run_once = true;
 506
 507         /*
 508          * Map the VGIC hardware resources before running a vcpu the first
 509          * time on this VM.
 510          */
 511         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 512                 ret = kvm_vgic_map_resources(kvm);
 513                 if (ret)
 514                         return ret;
 515         }
 516
 517         /*
 518          * Enable the arch timers only if we have an in-kernel VGIC
 519          * and it has been properly initialized, since we cannot handle
 520          * interrupts from the virtual timer with a userspace gic.
 521          */
 522         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 523                 ret = kvm_timer_enable(vcpu);
 524
 525         return ret;
 526 }
 527
 528 bool kvm_arch_intc_initialized(struct kvm *kvm)
 529 {
 530         return vgic_initialized(kvm);
 531 }
 532
 533 void kvm_arm_halt_guest(struct kvm *kvm)
 534 {
 535         int i;
 536         struct kvm_vcpu *vcpu;
 537
 538         kvm_for_each_vcpu(i, vcpu, kvm)
 539                 vcpu->arch.pause = true;
 540         kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
 541 }
 542
 543 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
 544 {
 545         vcpu->arch.pause = true;
 546         kvm_vcpu_kick(vcpu);
 547 }
 548
 549 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
 550 {
 551         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 552
 553         vcpu->arch.pause = false;
 554         swake_up(wq);
 555 }
 556
 557 void kvm_arm_resume_guest(struct kvm *kvm)
 558 {
 559         int i;
 560         struct kvm_vcpu *vcpu;
 561
 562         kvm_for_each_vcpu(i, vcpu, kvm)
 563                 kvm_arm_resume_vcpu(vcpu);
 564 }
 565
 566 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 567 {
 568         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 569
 570         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 571                                        (!vcpu->arch.pause)));
 572 }
 573
 574 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 575 {
 576         return vcpu->arch.target >= 0;
 577 }
 578
 579 /**
 580  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 581  * @vcpu:       The VCPU pointer
 582  * @run:        The kvm_run structure pointer used for userspace state exchange
 583  *
 584  * This function is called through the VCPU_RUN ioctl called from user space. It
 585  * will execute VM code in a loop until the time slice for the process is used
 586  * or some emulation is needed from user space in which case the function will
 587  * return with return value 0 and with the kvm_run structure filled in with the
 588  * required data for the requested emulation.
 589  */
 590 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 591 {
 592         int ret;
 593         sigset_t sigsaved;
 594
 595         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 596                 return -ENOEXEC;
 597
 598         ret = kvm_vcpu_first_run_init(vcpu);
 599         if (ret)
 600                 return ret;
 601
 602         if (run->exit_reason == KVM_EXIT_MMIO) {
 603                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 604                 if (ret)
 605                         return ret;
 606         }
 607
 608         if (run->immediate_exit)
 609                 return -EINTR;
 610
 611         if (vcpu->sigset_active)
 612                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 613
 614         ret = 1;
 615         run->exit_reason = KVM_EXIT_UNKNOWN;
 616         while (ret > 0) {
 617                 /*
 618                  * Check conditions before entering the guest
 619                  */
 620                 cond_resched();
 621
 622                 update_vttbr(vcpu->kvm);
 623
 624                 if (vcpu->arch.power_off || vcpu->arch.pause)
 625                         vcpu_sleep(vcpu);
 626
 627                 /*
 628                  * Preparing the interrupts to be injected also
 629                  * involves poking the GIC, which must be done in a
 630                  * non-preemptible context.
 631                  */
 632                 preempt_disable();
 633                 kvm_pmu_flush_hwstate(vcpu);
 634                 kvm_timer_flush_hwstate(vcpu);
 635                 kvm_vgic_flush_hwstate(vcpu);
 636
 637                 local_irq_disable();
 638
 639                 /*
 640                  * Re-check atomic conditions
 641                  */
 642                 if (signal_pending(current)) {
 643                         ret = -EINTR;
 644                         run->exit_reason = KVM_EXIT_INTR;
 645                 }
 646
 647                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 648                         vcpu->arch.power_off || vcpu->arch.pause) {
 649                         local_irq_enable();
 650                         kvm_pmu_sync_hwstate(vcpu);
 651                         kvm_timer_sync_hwstate(vcpu);
 652                         kvm_vgic_sync_hwstate(vcpu);
 653                         preempt_enable();
 654                         continue;
 655                 }
 656
 657                 kvm_arm_setup_debug(vcpu);
 658
 659                 /**************************************************************
 660                  * Enter the guest
 661                  */
 662                 trace_kvm_entry(*vcpu_pc(vcpu));
 663                 guest_enter_irqoff();
 664                 vcpu->mode = IN_GUEST_MODE;
 665
 666                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 667
 668                 vcpu->mode = OUTSIDE_GUEST_MODE;
 669                 vcpu->stat.exits++;
 670                 /*
 671                  * Back from guest
 672                  *************************************************************/
 673
 674                 kvm_arm_clear_debug(vcpu);
 675
 676                 /*
 677                  * We may have taken a host interrupt in HYP mode (ie
 678                  * while executing the guest). This interrupt is still
 679                  * pending, as we haven't serviced it yet!
 680                  *
 681                  * We're now back in SVC mode, with interrupts
 682                  * disabled.  Enabling the interrupts now will have
 683                  * the effect of taking the interrupt again, in SVC
 684                  * mode this time.
 685                  */
 686                 local_irq_enable();
 687
 688                 /*
 689                  * We do local_irq_enable() before calling guest_exit() so
 690                  * that if a timer interrupt hits while running the guest we
 691                  * account that tick as being spent in the guest.  We enable
 692                  * preemption after calling guest_exit() so that if we get
 693                  * preempted we make sure ticks after that is not counted as
 694                  * guest time.
 695                  */
 696                 guest_exit();
 697                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 698
 699                 /*
 700                  * We must sync the PMU and timer state before the vgic state so
 701                  * that the vgic can properly sample the updated state of the
 702                  * interrupt line.
 703                  */
 704                 kvm_pmu_sync_hwstate(vcpu);
 705                 kvm_timer_sync_hwstate(vcpu);
 706
 707                 kvm_vgic_sync_hwstate(vcpu);
 708
 709                 preempt_enable();
 710
 711                 ret = handle_exit(vcpu, run, ret);
 712         }
 713
 714         if (vcpu->sigset_active)
 715                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 716         return ret;
 717 }
 718
 719 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 720 {
 721         int bit_index;
 722         bool set;
 723         unsigned long *ptr;
 724
 725         if (number == KVM_ARM_IRQ_CPU_IRQ)
 726                 bit_index = __ffs(HCR_VI);
 727         else /* KVM_ARM_IRQ_CPU_FIQ */
 728                 bit_index = __ffs(HCR_VF);
 729
 730         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 731         if (level)
 732                 set = test_and_set_bit(bit_index, ptr);
 733         else
 734                 set = test_and_clear_bit(bit_index, ptr);
 735
 736         /*
 737          * If we didn't change anything, no need to wake up or kick other CPUs
 738          */
 739         if (set == level)
 740                 return 0;
 741
 742         /*
 743          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 744          * trigger a world-switch round on the running physical CPU to set the
 745          * virtual IRQ/FIQ fields in the HCR appropriately.
 746          */
 747         kvm_vcpu_kick(vcpu);
 748
 749         return 0;
 750 }
 751
 752 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 753                           bool line_status)
 754 {
 755         u32 irq = irq_level->irq;
 756         unsigned int irq_type, vcpu_idx, irq_num;
 757         int nrcpus = atomic_read(&kvm->online_vcpus);
 758         struct kvm_vcpu *vcpu = NULL;
 759         bool level = irq_level->level;
 760
 761         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 762         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 763         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 764
 765         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 766
 767         switch (irq_type) {
 768         case KVM_ARM_IRQ_TYPE_CPU:
 769                 if (irqchip_in_kernel(kvm))
 770                         return -ENXIO;
 771
 772                 if (vcpu_idx >= nrcpus)
 773                         return -EINVAL;
 774
 775                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 776                 if (!vcpu)
 777                         return -EINVAL;
 778
 779                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 780                         return -EINVAL;
 781
 782                 return vcpu_interrupt_line(vcpu, irq_num, level);
 783         case KVM_ARM_IRQ_TYPE_PPI:
 784                 if (!irqchip_in_kernel(kvm))
 785                         return -ENXIO;
 786
 787                 if (vcpu_idx >= nrcpus)
 788                         return -EINVAL;
 789
 790                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 791                 if (!vcpu)
 792                         return -EINVAL;
 793
 794                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 795                         return -EINVAL;
 796
 797                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 798         case KVM_ARM_IRQ_TYPE_SPI:
 799                 if (!irqchip_in_kernel(kvm))
 800                         return -ENXIO;
 801
 802                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 803                         return -EINVAL;
 804
 805                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 806         }
 807
 808         return -EINVAL;
 809 }
 810
 811 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 812                                const struct kvm_vcpu_init *init)
 813 {
 814         unsigned int i;
 815         int phys_target = kvm_target_cpu();
 816
 817         if (init->target != phys_target)
 818                 return -EINVAL;
 819
 820         /*
 821          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 822          * use the same target.
 823          */
 824         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 825                 return -EINVAL;
 826
 827         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 828         for (i = 0; i < sizeof(init->features) * 8; i++) {
 829                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 830
 831                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 832                         return -ENOENT;
 833
 834                 /*
 835                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 836                  * use the same feature set.
 837                  */
 838                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 839                     test_bit(i, vcpu->arch.features) != set)
 840                         return -EINVAL;
 841
 842                 if (set)
 843                         set_bit(i, vcpu->arch.features);
 844         }
 845
 846         vcpu->arch.target = phys_target;
 847
 848         /* Now we know what it is, we can reset it. */
 849         return kvm_reset_vcpu(vcpu);
 850 }
 851
 852
 853 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 854                                          struct kvm_vcpu_init *init)
 855 {
 856         int ret;
 857
 858         ret = kvm_vcpu_set_target(vcpu, init);
 859         if (ret)
 860                 return ret;
 861
 862         /*
 863          * Ensure a rebooted VM will fault in RAM pages and detect if the
 864          * guest MMU is turned off and flush the caches as needed.
 865          */
 866         if (vcpu->arch.has_run_once)
 867                 stage2_unmap_vm(vcpu->kvm);
 868
 869         vcpu_reset_hcr(vcpu);
 870
 871         /*
 872          * Handle the "start in power-off" case.
 873          */
 874         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 875                 vcpu->arch.power_off = true;
 876         else
 877                 vcpu->arch.power_off = false;
 878
 879         return 0;
 880 }
 881
 882 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 883                                  struct kvm_device_attr *attr)
 884 {
 885         int ret = -ENXIO;
 886
 887         switch (attr->group) {
 888         default:
 889                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 890                 break;
 891         }
 892
 893         return ret;
 894 }
 895
 896 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 897                                  struct kvm_device_attr *attr)
 898 {
 899         int ret = -ENXIO;
 900
 901         switch (attr->group) {
 902         default:
 903                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 904                 break;
 905         }
 906
 907         return ret;
 908 }
 909
 910 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 911                                  struct kvm_device_attr *attr)
 912 {
 913         int ret = -ENXIO;
 914
 915         switch (attr->group) {
 916         default:
 917                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 918                 break;
 919         }
 920
 921         return ret;
 922 }
 923
 924 long kvm_arch_vcpu_ioctl(struct file *filp,
 925                          unsigned int ioctl, unsigned long arg)
 926 {
 927         struct kvm_vcpu *vcpu = filp->private_data;
 928         void __user *argp = (void __user *)arg;
 929         struct kvm_device_attr attr;
 930
 931         switch (ioctl) {
 932         case KVM_ARM_VCPU_INIT: {
 933                 struct kvm_vcpu_init init;
 934
 935                 if (copy_from_user(&init, argp, sizeof(init)))
 936                         return -EFAULT;
 937
 938                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 939         }
 940         case KVM_SET_ONE_REG:
 941         case KVM_GET_ONE_REG: {
 942                 struct kvm_one_reg reg;
 943
 944                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 945                         return -ENOEXEC;
 946
 947                 if (copy_from_user(&reg, argp, sizeof(reg)))
 948                         return -EFAULT;
 949                 if (ioctl == KVM_SET_ONE_REG)
 950                         return kvm_arm_set_reg(vcpu, &reg);
 951                 else
 952                         return kvm_arm_get_reg(vcpu, &reg);
 953         }
 954         case KVM_GET_REG_LIST: {
 955                 struct kvm_reg_list __user *user_list = argp;
 956                 struct kvm_reg_list reg_list;
 957                 unsigned n;
 958
 959                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 960                         return -ENOEXEC;
 961
 962                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 963                         return -EFAULT;
 964                 n = reg_list.n;
 965                 reg_list.n = kvm_arm_num_regs(vcpu);
 966                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 967                         return -EFAULT;
 968                 if (n < reg_list.n)
 969                         return -E2BIG;
 970                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 971         }
 972         case KVM_SET_DEVICE_ATTR: {
 973                 if (copy_from_user(&attr, argp, sizeof(attr)))
 974                         return -EFAULT;
 975                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 976         }
 977         case KVM_GET_DEVICE_ATTR: {
 978                 if (copy_from_user(&attr, argp, sizeof(attr)))
 979                         return -EFAULT;
 980                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 981         }
 982         case KVM_HAS_DEVICE_ATTR: {
 983                 if (copy_from_user(&attr, argp, sizeof(attr)))
 984                         return -EFAULT;
 985                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 986         }
 987         default:
 988                 return -EINVAL;
 989         }
 990 }
 991
 992 /**
 993  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 994  * @kvm: kvm instance
 995  * @log: slot id and address to which we copy the log
 996  *
 997  * Steps 1-4 below provide general overview of dirty page logging. See
 998  * kvm_get_dirty_log_protect() function description for additional details.
 999  *
1000  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1001  * always flush the TLB (step 4) even if previous step failed  and the dirty
1002  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1003  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1004  * writes will be marked dirty for next log read.
1005  *
1006  *   1. Take a snapshot of the bit and clear it if needed.
1007  *   2. Write protect the corresponding page.
1008  *   3. Copy the snapshot to the userspace.
1009  *   4. Flush TLB's if needed.
1010  */
1011 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1012 {
1013         bool is_dirty = false;
1014         int r;
1015
1016         mutex_lock(&kvm->slots_lock);
1017
1018         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
1019
1020         if (is_dirty)
1021                 kvm_flush_remote_tlbs(kvm);
1022
1023         mutex_unlock(&kvm->slots_lock);
1024         return r;
1025 }
1026
1027 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1028                                         struct kvm_arm_device_addr *dev_addr)
1029 {
1030         unsigned long dev_id, type;
1031
1032         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1033                 KVM_ARM_DEVICE_ID_SHIFT;
1034         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1035                 KVM_ARM_DEVICE_TYPE_SHIFT;
1036
1037         switch (dev_id) {
1038         case KVM_ARM_DEVICE_VGIC_V2:
1039                 if (!vgic_present)
1040                         return -ENXIO;
1041                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1042         default:
1043                 return -ENODEV;
1044         }
1045 }
1046
1047 long kvm_arch_vm_ioctl(struct file *filp,
1048                        unsigned int ioctl, unsigned long arg)
1049 {
1050         struct kvm *kvm = filp->private_data;
1051         void __user *argp = (void __user *)arg;
1052
1053         switch (ioctl) {
1054         case KVM_CREATE_IRQCHIP: {
1055                 int ret;
1056                 if (!vgic_present)
1057                         return -ENXIO;
1058                 mutex_lock(&kvm->lock);
1059                 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1060                 mutex_unlock(&kvm->lock);
1061                 return ret;
1062         }
1063         case KVM_ARM_SET_DEVICE_ADDR: {
1064                 struct kvm_arm_device_addr dev_addr;
1065
1066                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1067                         return -EFAULT;
1068                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1069         }
1070         case KVM_ARM_PREFERRED_TARGET: {
1071                 int err;
1072                 struct kvm_vcpu_init init;
1073
1074                 err = kvm_vcpu_preferred_target(&init);
1075                 if (err)
1076                         return err;
1077
1078                 if (copy_to_user(argp, &init, sizeof(init)))
1079                         return -EFAULT;
1080
1081                 return 0;
1082         }
1083         default:
1084                 return -EINVAL;
1085         }
1086 }
1087
1088 static void cpu_init_hyp_mode(void *dummy)
1089 {
1090         phys_addr_t pgd_ptr;
1091         unsigned long hyp_stack_ptr;
1092         unsigned long stack_page;
1093         unsigned long vector_ptr;
1094
1095         /* Switch from the HYP stub to our own HYP init vector */
1096         __hyp_set_vectors(kvm_get_idmap_vector());
1097
1098         pgd_ptr = kvm_mmu_get_httbr();
1099         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1100         hyp_stack_ptr = stack_page + PAGE_SIZE;
1101         vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1102
1103         __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1104         __cpu_init_stage2();
1105
1106         if (is_kernel_in_hyp_mode())
1107                 kvm_timer_init_vhe();
1108
1109         kvm_arm_init_debug();
1110 }
1111
1112 static void cpu_hyp_reinit(void)
1113 {
1114         if (is_kernel_in_hyp_mode()) {
1115                 /*
1116                  * __cpu_init_stage2() is safe to call even if the PM
1117                  * event was cancelled before the CPU was reset.
1118                  */
1119                 __cpu_init_stage2();
1120         } else {
1121                 if (__hyp_get_vectors() == hyp_default_vectors)
1122                         cpu_init_hyp_mode(NULL);
1123         }
1124 }
1125
1126 static void cpu_hyp_reset(void)
1127 {
1128         if (!is_kernel_in_hyp_mode())
1129                 __cpu_reset_hyp_mode(hyp_default_vectors,
1130                                      kvm_get_idmap_start());
1131 }
1132
1133 static void _kvm_arch_hardware_enable(void *discard)
1134 {
1135         if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1136                 cpu_hyp_reinit();
1137                 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1138         }
1139 }
1140
1141 int kvm_arch_hardware_enable(void)
1142 {
1143         _kvm_arch_hardware_enable(NULL);
1144         return 0;
1145 }
1146
1147 static void _kvm_arch_hardware_disable(void *discard)
1148 {
1149         if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1150                 cpu_hyp_reset();
1151                 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1152         }
1153 }
1154
1155 void kvm_arch_hardware_disable(void)
1156 {
1157         _kvm_arch_hardware_disable(NULL);
1158 }
1159
1160 #ifdef CONFIG_CPU_PM
1161 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1162                                     unsigned long cmd,
1163                                     void *v)
1164 {
1165         /*
1166          * kvm_arm_hardware_enabled is left with its old value over
1167          * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1168          * re-enable hyp.
1169          */
1170         switch (cmd) {
1171         case CPU_PM_ENTER:
1172                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1173                         /*
1174                          * don't update kvm_arm_hardware_enabled here
1175                          * so that the hardware will be re-enabled
1176                          * when we resume. See below.
1177                          */
1178                         cpu_hyp_reset();
1179
1180                 return NOTIFY_OK;
1181         case CPU_PM_EXIT:
1182                 if (__this_cpu_read(kvm_arm_hardware_enabled))
1183                         /* The hardware was enabled before suspend. */
1184                         cpu_hyp_reinit();
1185
1186                 return NOTIFY_OK;
1187
1188         default:
1189                 return NOTIFY_DONE;
1190         }
1191 }
1192
1193 static struct notifier_block hyp_init_cpu_pm_nb = {
1194         .notifier_call = hyp_init_cpu_pm_notifier,
1195 };
1196
1197 static void __init hyp_cpu_pm_init(void)
1198 {
1199         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1200 }
1201 static void __init hyp_cpu_pm_exit(void)
1202 {
1203         cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1204 }
1205 #else
1206 static inline void hyp_cpu_pm_init(void)
1207 {
1208 }
1209 static inline void hyp_cpu_pm_exit(void)
1210 {
1211 }
1212 #endif
1213
1214 static void teardown_common_resources(void)
1215 {
1216         free_percpu(kvm_host_cpu_state);
1217 }
1218
1219 static int init_common_resources(void)
1220 {
1221         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1222         if (!kvm_host_cpu_state) {
1223                 kvm_err("Cannot allocate host CPU state\n");
1224                 return -ENOMEM;
1225         }
1226
1227         /* set size of VMID supported by CPU */
1228         kvm_vmid_bits = kvm_get_vmid_bits();
1229         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1230
1231         return 0;
1232 }
1233
1234 static int init_subsystems(void)
1235 {
1236         int err = 0;
1237
1238         /*
1239          * Enable hardware so that subsystem initialisation can access EL2.
1240          */
1241         on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1242
1243         /*
1244          * Register CPU lower-power notifier
1245          */
1246         hyp_cpu_pm_init();
1247
1248         /*
1249          * Init HYP view of VGIC
1250          */
1251         err = kvm_vgic_hyp_init();
1252         switch (err) {
1253         case 0:
1254                 vgic_present = true;
1255                 break;
1256         case -ENODEV:
1257         case -ENXIO:
1258                 vgic_present = false;
1259                 err = 0;
1260                 break;
1261         default:
1262                 goto out;
1263         }
1264
1265         /*
1266          * Init HYP architected timer support
1267          */
1268         err = kvm_timer_hyp_init();
1269         if (err)
1270                 goto out;
1271
1272         kvm_perf_init();
1273         kvm_coproc_table_init();
1274
1275 out:
1276         on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1277
1278         return err;
1279 }
1280
1281 static void teardown_hyp_mode(void)
1282 {
1283         int cpu;
1284
1285         if (is_kernel_in_hyp_mode())
1286                 return;
1287
1288         free_hyp_pgds();
1289         for_each_possible_cpu(cpu)
1290                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1291         hyp_cpu_pm_exit();
1292 }
1293
1294 static int init_vhe_mode(void)
1295 {
1296         kvm_info("VHE mode initialized successfully\n");
1297         return 0;
1298 }
1299
1300 /**
1301  * Inits Hyp-mode on all online CPUs
1302  */
1303 static int init_hyp_mode(void)
1304 {
1305         int cpu;
1306         int err = 0;
1307
1308         /*
1309          * Allocate Hyp PGD and setup Hyp identity mapping
1310          */
1311         err = kvm_mmu_init();
1312         if (err)
1313                 goto out_err;
1314
1315         /*
1316          * It is probably enough to obtain the default on one
1317          * CPU. It's unlikely to be different on the others.
1318          */
1319         hyp_default_vectors = __hyp_get_vectors();
1320
1321         /*
1322          * Allocate stack pages for Hypervisor-mode
1323          */
1324         for_each_possible_cpu(cpu) {
1325                 unsigned long stack_page;
1326
1327                 stack_page = __get_free_page(GFP_KERNEL);
1328                 if (!stack_page) {
1329                         err = -ENOMEM;
1330                         goto out_err;
1331                 }
1332
1333                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1334         }
1335
1336         /*
1337          * Map the Hyp-code called directly from the host
1338          */
1339         err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1340                                   kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1341         if (err) {
1342                 kvm_err("Cannot map world-switch code\n");
1343                 goto out_err;
1344         }
1345
1346         err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1347                                   kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1348         if (err) {
1349                 kvm_err("Cannot map rodata section\n");
1350                 goto out_err;
1351         }
1352
1353         err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
1354                                   kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1355         if (err) {
1356                 kvm_err("Cannot map bss section\n");
1357                 goto out_err;
1358         }
1359
1360         /*
1361          * Map the Hyp stack pages
1362          */
1363         for_each_possible_cpu(cpu) {
1364                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1365                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1366                                           PAGE_HYP);
1367
1368                 if (err) {
1369                         kvm_err("Cannot map hyp stack\n");
1370                         goto out_err;
1371                 }
1372         }
1373
1374         for_each_possible_cpu(cpu) {
1375                 kvm_cpu_context_t *cpu_ctxt;
1376
1377                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1378                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1379
1380                 if (err) {
1381                         kvm_err("Cannot map host CPU state: %d\n", err);
1382                         goto out_err;
1383                 }
1384         }
1385
1386         kvm_info("Hyp mode initialized successfully\n");
1387
1388         return 0;
1389
1390 out_err:
1391         teardown_hyp_mode();
1392         kvm_err("error initializing Hyp mode: %d\n", err);
1393         return err;
1394 }
1395
1396 static void check_kvm_target_cpu(void *ret)
1397 {
1398         *(int *)ret = kvm_target_cpu();
1399 }
1400
1401 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1402 {
1403         struct kvm_vcpu *vcpu;
1404         int i;
1405
1406         mpidr &= MPIDR_HWID_BITMASK;
1407         kvm_for_each_vcpu(i, vcpu, kvm) {
1408                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1409                         return vcpu;
1410         }
1411         return NULL;
1412 }
1413
1414 /**
1415  * Initialize Hyp-mode and memory mappings on all CPUs.
1416  */
1417 int kvm_arch_init(void *opaque)
1418 {
1419         int err;
1420         int ret, cpu;
1421
1422         if (!is_hyp_mode_available()) {
1423                 kvm_err("HYP mode not available\n");
1424                 return -ENODEV;
1425         }
1426
1427         for_each_online_cpu(cpu) {
1428                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1429                 if (ret < 0) {
1430                         kvm_err("Error, CPU %d not supported!\n", cpu);
1431                         return -ENODEV;
1432                 }
1433         }
1434
1435         err = init_common_resources();
1436         if (err)
1437                 return err;
1438
1439         if (is_kernel_in_hyp_mode())
1440                 err = init_vhe_mode();
1441         else
1442                 err = init_hyp_mode();
1443         if (err)
1444                 goto out_err;
1445
1446         err = init_subsystems();
1447         if (err)
1448                 goto out_hyp;
1449
1450         return 0;
1451
1452 out_hyp:
1453         teardown_hyp_mode();
1454 out_err:
1455         teardown_common_resources();
1456         return err;
1457 }
1458
1459 /* NOP: Compiling as a module not supported */
1460 void kvm_arch_exit(void)
1461 {
1462         kvm_perf_teardown();
1463 }
1464
1465 static int arm_init(void)
1466 {
1467         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1468         return rc;
1469 }
1470
1471 module_init(arm_init);