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