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.h>
  20 #include <linux/cpu_pm.h>
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.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 void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  70 {
  71         BUG_ON(preemptible());
  72         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  73 }
  74
  75 /**
  76  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  77  * Must be called from non-preemptible context
  78  */
  79 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  80 {
  81         BUG_ON(preemptible());
  82         return __this_cpu_read(kvm_arm_running_vcpu);
  83 }
  84
  85 /**
  86  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  87  */
  88 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
  89 {
  90         return &kvm_arm_running_vcpu;
  91 }
  92
  93 int kvm_arch_hardware_enable(void)
  94 {
  95         return 0;
  96 }
  97
  98 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  99 {
 100         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
 101 }
 102
 103 int kvm_arch_hardware_setup(void)
 104 {
 105         return 0;
 106 }
 107
 108 void kvm_arch_check_processor_compat(void *rtn)
 109 {
 110         *(int *)rtn = 0;
 111 }
 112
 113
 114 /**
 115  * kvm_arch_init_vm - initializes a VM data structure
 116  * @kvm:        pointer to the KVM struct
 117  */
 118 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 119 {
 120         int ret = 0;
 121
 122         if (type)
 123                 return -EINVAL;
 124
 125         ret = kvm_alloc_stage2_pgd(kvm);
 126         if (ret)
 127                 goto out_fail_alloc;
 128
 129         ret = create_hyp_mappings(kvm, kvm + 1);
 130         if (ret)
 131                 goto out_free_stage2_pgd;
 132
 133         kvm_vgic_early_init(kvm);
 134         kvm_timer_init(kvm);
 135
 136         /* Mark the initial VMID generation invalid */
 137         kvm->arch.vmid_gen = 0;
 138
 139         /* The maximum number of VCPUs is limited by the host's GIC model */
 140         kvm->arch.max_vcpus = vgic_present ?
 141                                 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 142
 143         return ret;
 144 out_free_stage2_pgd:
 145         kvm_free_stage2_pgd(kvm);
 146 out_fail_alloc:
 147         return ret;
 148 }
 149
 150 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 151 {
 152         return VM_FAULT_SIGBUS;
 153 }
 154
 155
 156 /**
 157  * kvm_arch_destroy_vm - destroy the VM data structure
 158  * @kvm:        pointer to the KVM struct
 159  */
 160 void kvm_arch_destroy_vm(struct kvm *kvm)
 161 {
 162         int i;
 163
 164         kvm_free_stage2_pgd(kvm);
 165
 166         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 167                 if (kvm->vcpus[i]) {
 168                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 169                         kvm->vcpus[i] = NULL;
 170                 }
 171         }
 172
 173         kvm_vgic_destroy(kvm);
 174 }
 175
 176 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 177 {
 178         int r;
 179         switch (ext) {
 180         case KVM_CAP_IRQCHIP:
 181                 r = vgic_present;
 182                 break;
 183         case KVM_CAP_IOEVENTFD:
 184         case KVM_CAP_DEVICE_CTRL:
 185         case KVM_CAP_USER_MEMORY:
 186         case KVM_CAP_SYNC_MMU:
 187         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 188         case KVM_CAP_ONE_REG:
 189         case KVM_CAP_ARM_PSCI:
 190         case KVM_CAP_ARM_PSCI_0_2:
 191         case KVM_CAP_READONLY_MEM:
 192         case KVM_CAP_MP_STATE:
 193                 r = 1;
 194                 break;
 195         case KVM_CAP_COALESCED_MMIO:
 196                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 197                 break;
 198         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 199                 r = 1;
 200                 break;
 201         case KVM_CAP_NR_VCPUS:
 202                 r = num_online_cpus();
 203                 break;
 204         case KVM_CAP_MAX_VCPUS:
 205                 r = KVM_MAX_VCPUS;
 206                 break;
 207         default:
 208                 r = kvm_arch_dev_ioctl_check_extension(ext);
 209                 break;
 210         }
 211         return r;
 212 }
 213
 214 long kvm_arch_dev_ioctl(struct file *filp,
 215                         unsigned int ioctl, unsigned long arg)
 216 {
 217         return -EINVAL;
 218 }
 219
 220
 221 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 222 {
 223         int err;
 224         struct kvm_vcpu *vcpu;
 225
 226         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
 227                 err = -EBUSY;
 228                 goto out;
 229         }
 230
 231         if (id >= kvm->arch.max_vcpus) {
 232                 err = -EINVAL;
 233                 goto out;
 234         }
 235
 236         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 237         if (!vcpu) {
 238                 err = -ENOMEM;
 239                 goto out;
 240         }
 241
 242         err = kvm_vcpu_init(vcpu, kvm, id);
 243         if (err)
 244                 goto free_vcpu;
 245
 246         err = create_hyp_mappings(vcpu, vcpu + 1);
 247         if (err)
 248                 goto vcpu_uninit;
 249
 250         return vcpu;
 251 vcpu_uninit:
 252         kvm_vcpu_uninit(vcpu);
 253 free_vcpu:
 254         kmem_cache_free(kvm_vcpu_cache, vcpu);
 255 out:
 256         return ERR_PTR(err);
 257 }
 258
 259 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 260 {
 261         kvm_vgic_vcpu_early_init(vcpu);
 262 }
 263
 264 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 265 {
 266         kvm_mmu_free_memory_caches(vcpu);
 267         kvm_timer_vcpu_terminate(vcpu);
 268         kvm_vgic_vcpu_destroy(vcpu);
 269         kvm_pmu_vcpu_destroy(vcpu);
 270         kmem_cache_free(kvm_vcpu_cache, vcpu);
 271 }
 272
 273 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 274 {
 275         kvm_arch_vcpu_free(vcpu);
 276 }
 277
 278 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 279 {
 280         return kvm_timer_should_fire(vcpu);
 281 }
 282
 283 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 284 {
 285         kvm_timer_schedule(vcpu);
 286 }
 287
 288 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
 289 {
 290         kvm_timer_unschedule(vcpu);
 291 }
 292
 293 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 294 {
 295         /* Force users to call KVM_ARM_VCPU_INIT */
 296         vcpu->arch.target = -1;
 297         bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
 298
 299         /* Set up the timer */
 300         kvm_timer_vcpu_init(vcpu);
 301
 302         kvm_arm_reset_debug_ptr(vcpu);
 303
 304         return 0;
 305 }
 306
 307 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 308 {
 309         vcpu->cpu = cpu;
 310         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 311
 312         kvm_arm_set_running_vcpu(vcpu);
 313 }
 314
 315 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 316 {
 317         /*
 318          * The arch-generic KVM code expects the cpu field of a vcpu to be -1
 319          * if the vcpu is no longer assigned to a cpu.  This is used for the
 320          * optimized make_all_cpus_request path.
 321          */
 322         vcpu->cpu = -1;
 323
 324         kvm_arm_set_running_vcpu(NULL);
 325         kvm_timer_vcpu_put(vcpu);
 326 }
 327
 328 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 329                                     struct kvm_mp_state *mp_state)
 330 {
 331         if (vcpu->arch.power_off)
 332                 mp_state->mp_state = KVM_MP_STATE_STOPPED;
 333         else
 334                 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
 335
 336         return 0;
 337 }
 338
 339 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 340                                     struct kvm_mp_state *mp_state)
 341 {
 342         switch (mp_state->mp_state) {
 343         case KVM_MP_STATE_RUNNABLE:
 344                 vcpu->arch.power_off = false;
 345                 break;
 346         case KVM_MP_STATE_STOPPED:
 347                 vcpu->arch.power_off = true;
 348                 break;
 349         default:
 350                 return -EINVAL;
 351         }
 352
 353         return 0;
 354 }
 355
 356 /**
 357  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 358  * @v:          The VCPU pointer
 359  *
 360  * If the guest CPU is not waiting for interrupts or an interrupt line is
 361  * asserted, the CPU is by definition runnable.
 362  */
 363 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 364 {
 365         return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
 366                 && !v->arch.power_off && !v->arch.pause);
 367 }
 368
 369 /* Just ensure a guest exit from a particular CPU */
 370 static void exit_vm_noop(void *info)
 371 {
 372 }
 373
 374 void force_vm_exit(const cpumask_t *mask)
 375 {
 376         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 377 }
 378
 379 /**
 380  * need_new_vmid_gen - check that the VMID is still valid
 381  * @kvm: The VM's VMID to checkt
 382  *
 383  * return true if there is a new generation of VMIDs being used
 384  *
 385  * The hardware supports only 256 values with the value zero reserved for the
 386  * host, so we check if an assigned value belongs to a previous generation,
 387  * which which requires us to assign a new value. If we're the first to use a
 388  * VMID for the new generation, we must flush necessary caches and TLBs on all
 389  * CPUs.
 390  */
 391 static bool need_new_vmid_gen(struct kvm *kvm)
 392 {
 393         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 394 }
 395
 396 /**
 397  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 398  * @kvm The guest that we are about to run
 399  *
 400  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 401  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 402  * caches and TLBs.
 403  */
 404 static void update_vttbr(struct kvm *kvm)
 405 {
 406         phys_addr_t pgd_phys;
 407         u64 vmid;
 408
 409         if (!need_new_vmid_gen(kvm))
 410                 return;
 411
 412         spin_lock(&kvm_vmid_lock);
 413
 414         /*
 415          * We need to re-check the vmid_gen here to ensure that if another vcpu
 416          * already allocated a valid vmid for this vm, then this vcpu should
 417          * use the same vmid.
 418          */
 419         if (!need_new_vmid_gen(kvm)) {
 420                 spin_unlock(&kvm_vmid_lock);
 421                 return;
 422         }
 423
 424         /* First user of a new VMID generation? */
 425         if (unlikely(kvm_next_vmid == 0)) {
 426                 atomic64_inc(&kvm_vmid_gen);
 427                 kvm_next_vmid = 1;
 428
 429                 /*
 430                  * On SMP we know no other CPUs can use this CPU's or each
 431                  * other's VMID after force_vm_exit returns since the
 432                  * kvm_vmid_lock blocks them from reentry to the guest.
 433                  */
 434                 force_vm_exit(cpu_all_mask);
 435                 /*
 436                  * Now broadcast TLB + ICACHE invalidation over the inner
 437                  * shareable domain to make sure all data structures are
 438                  * clean.
 439                  */
 440                 kvm_call_hyp(__kvm_flush_vm_context);
 441         }
 442
 443         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 444         kvm->arch.vmid = kvm_next_vmid;
 445         kvm_next_vmid++;
 446         kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
 447
 448         /* update vttbr to be used with the new vmid */
 449         pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
 450         BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
 451         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
 452         kvm->arch.vttbr = pgd_phys | vmid;
 453
 454         spin_unlock(&kvm_vmid_lock);
 455 }
 456
 457 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 458 {
 459         struct kvm *kvm = vcpu->kvm;
 460         int ret;
 461
 462         if (likely(vcpu->arch.has_run_once))
 463                 return 0;
 464
 465         vcpu->arch.has_run_once = true;
 466
 467         /*
 468          * Map the VGIC hardware resources before running a vcpu the first
 469          * time on this VM.
 470          */
 471         if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
 472                 ret = kvm_vgic_map_resources(kvm);
 473                 if (ret)
 474                         return ret;
 475         }
 476
 477         /*
 478          * Enable the arch timers only if we have an in-kernel VGIC
 479          * and it has been properly initialized, since we cannot handle
 480          * interrupts from the virtual timer with a userspace gic.
 481          */
 482         if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
 483                 kvm_timer_enable(kvm);
 484
 485         return 0;
 486 }
 487
 488 bool kvm_arch_intc_initialized(struct kvm *kvm)
 489 {
 490         return vgic_initialized(kvm);
 491 }
 492
 493 static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused;
 494 static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused;
 495
 496 static void kvm_arm_halt_guest(struct kvm *kvm)
 497 {
 498         int i;
 499         struct kvm_vcpu *vcpu;
 500
 501         kvm_for_each_vcpu(i, vcpu, kvm)
 502                 vcpu->arch.pause = true;
 503         force_vm_exit(cpu_all_mask);
 504 }
 505
 506 static void kvm_arm_resume_guest(struct kvm *kvm)
 507 {
 508         int i;
 509         struct kvm_vcpu *vcpu;
 510
 511         kvm_for_each_vcpu(i, vcpu, kvm) {
 512                 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 513
 514                 vcpu->arch.pause = false;
 515                 swake_up(wq);
 516         }
 517 }
 518
 519 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 520 {
 521         struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 522
 523         swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
 524                                        (!vcpu->arch.pause)));
 525 }
 526
 527 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 528 {
 529         return vcpu->arch.target >= 0;
 530 }
 531
 532 /**
 533  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 534  * @vcpu:       The VCPU pointer
 535  * @run:        The kvm_run structure pointer used for userspace state exchange
 536  *
 537  * This function is called through the VCPU_RUN ioctl called from user space. It
 538  * will execute VM code in a loop until the time slice for the process is used
 539  * or some emulation is needed from user space in which case the function will
 540  * return with return value 0 and with the kvm_run structure filled in with the
 541  * required data for the requested emulation.
 542  */
 543 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 544 {
 545         int ret;
 546         sigset_t sigsaved;
 547
 548         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 549                 return -ENOEXEC;
 550
 551         ret = kvm_vcpu_first_run_init(vcpu);
 552         if (ret)
 553                 return ret;
 554
 555         if (run->exit_reason == KVM_EXIT_MMIO) {
 556                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 557                 if (ret)
 558                         return ret;
 559         }
 560
 561         if (vcpu->sigset_active)
 562                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 563
 564         ret = 1;
 565         run->exit_reason = KVM_EXIT_UNKNOWN;
 566         while (ret > 0) {
 567                 /*
 568                  * Check conditions before entering the guest
 569                  */
 570                 cond_resched();
 571
 572                 update_vttbr(vcpu->kvm);
 573
 574                 if (vcpu->arch.power_off || vcpu->arch.pause)
 575                         vcpu_sleep(vcpu);
 576
 577                 /*
 578                  * Preparing the interrupts to be injected also
 579                  * involves poking the GIC, which must be done in a
 580                  * non-preemptible context.
 581                  */
 582                 preempt_disable();
 583                 kvm_pmu_flush_hwstate(vcpu);
 584                 kvm_timer_flush_hwstate(vcpu);
 585                 kvm_vgic_flush_hwstate(vcpu);
 586
 587                 local_irq_disable();
 588
 589                 /*
 590                  * Re-check atomic conditions
 591                  */
 592                 if (signal_pending(current)) {
 593                         ret = -EINTR;
 594                         run->exit_reason = KVM_EXIT_INTR;
 595                 }
 596
 597                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
 598                         vcpu->arch.power_off || vcpu->arch.pause) {
 599                         local_irq_enable();
 600                         kvm_pmu_sync_hwstate(vcpu);
 601                         kvm_timer_sync_hwstate(vcpu);
 602                         kvm_vgic_sync_hwstate(vcpu);
 603                         preempt_enable();
 604                         continue;
 605                 }
 606
 607                 kvm_arm_setup_debug(vcpu);
 608
 609                 /**************************************************************
 610                  * Enter the guest
 611                  */
 612                 trace_kvm_entry(*vcpu_pc(vcpu));
 613                 __kvm_guest_enter();
 614                 vcpu->mode = IN_GUEST_MODE;
 615
 616                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 617
 618                 vcpu->mode = OUTSIDE_GUEST_MODE;
 619                 vcpu->stat.exits++;
 620                 /*
 621                  * Back from guest
 622                  *************************************************************/
 623
 624                 kvm_arm_clear_debug(vcpu);
 625
 626                 /*
 627                  * We may have taken a host interrupt in HYP mode (ie
 628                  * while executing the guest). This interrupt is still
 629                  * pending, as we haven't serviced it yet!
 630                  *
 631                  * We're now back in SVC mode, with interrupts
 632                  * disabled.  Enabling the interrupts now will have
 633                  * the effect of taking the interrupt again, in SVC
 634                  * mode this time.
 635                  */
 636                 local_irq_enable();
 637
 638                 /*
 639                  * We do local_irq_enable() before calling kvm_guest_exit() so
 640                  * that if a timer interrupt hits while running the guest we
 641                  * account that tick as being spent in the guest.  We enable
 642                  * preemption after calling kvm_guest_exit() so that if we get
 643                  * preempted we make sure ticks after that is not counted as
 644                  * guest time.
 645                  */
 646                 kvm_guest_exit();
 647                 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 648
 649                 /*
 650                  * We must sync the PMU and timer state before the vgic state so
 651                  * that the vgic can properly sample the updated state of the
 652                  * interrupt line.
 653                  */
 654                 kvm_pmu_sync_hwstate(vcpu);
 655                 kvm_timer_sync_hwstate(vcpu);
 656
 657                 kvm_vgic_sync_hwstate(vcpu);
 658
 659                 preempt_enable();
 660
 661                 ret = handle_exit(vcpu, run, ret);
 662         }
 663
 664         if (vcpu->sigset_active)
 665                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 666         return ret;
 667 }
 668
 669 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 670 {
 671         int bit_index;
 672         bool set;
 673         unsigned long *ptr;
 674
 675         if (number == KVM_ARM_IRQ_CPU_IRQ)
 676                 bit_index = __ffs(HCR_VI);
 677         else /* KVM_ARM_IRQ_CPU_FIQ */
 678                 bit_index = __ffs(HCR_VF);
 679
 680         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 681         if (level)
 682                 set = test_and_set_bit(bit_index, ptr);
 683         else
 684                 set = test_and_clear_bit(bit_index, ptr);
 685
 686         /*
 687          * If we didn't change anything, no need to wake up or kick other CPUs
 688          */
 689         if (set == level)
 690                 return 0;
 691
 692         /*
 693          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 694          * trigger a world-switch round on the running physical CPU to set the
 695          * virtual IRQ/FIQ fields in the HCR appropriately.
 696          */
 697         kvm_vcpu_kick(vcpu);
 698
 699         return 0;
 700 }
 701
 702 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 703                           bool line_status)
 704 {
 705         u32 irq = irq_level->irq;
 706         unsigned int irq_type, vcpu_idx, irq_num;
 707         int nrcpus = atomic_read(&kvm->online_vcpus);
 708         struct kvm_vcpu *vcpu = NULL;
 709         bool level = irq_level->level;
 710
 711         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 712         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 713         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 714
 715         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 716
 717         switch (irq_type) {
 718         case KVM_ARM_IRQ_TYPE_CPU:
 719                 if (irqchip_in_kernel(kvm))
 720                         return -ENXIO;
 721
 722                 if (vcpu_idx >= nrcpus)
 723                         return -EINVAL;
 724
 725                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 726                 if (!vcpu)
 727                         return -EINVAL;
 728
 729                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 730                         return -EINVAL;
 731
 732                 return vcpu_interrupt_line(vcpu, irq_num, level);
 733         case KVM_ARM_IRQ_TYPE_PPI:
 734                 if (!irqchip_in_kernel(kvm))
 735                         return -ENXIO;
 736
 737                 if (vcpu_idx >= nrcpus)
 738                         return -EINVAL;
 739
 740                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 741                 if (!vcpu)
 742                         return -EINVAL;
 743
 744                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 745                         return -EINVAL;
 746
 747                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 748         case KVM_ARM_IRQ_TYPE_SPI:
 749                 if (!irqchip_in_kernel(kvm))
 750                         return -ENXIO;
 751
 752                 if (irq_num < VGIC_NR_PRIVATE_IRQS)
 753                         return -EINVAL;
 754
 755                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 756         }
 757
 758         return -EINVAL;
 759 }
 760
 761 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 762                                const struct kvm_vcpu_init *init)
 763 {
 764         unsigned int i;
 765         int phys_target = kvm_target_cpu();
 766
 767         if (init->target != phys_target)
 768                 return -EINVAL;
 769
 770         /*
 771          * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 772          * use the same target.
 773          */
 774         if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
 775                 return -EINVAL;
 776
 777         /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 778         for (i = 0; i < sizeof(init->features) * 8; i++) {
 779                 bool set = (init->features[i / 32] & (1 << (i % 32)));
 780
 781                 if (set && i >= KVM_VCPU_MAX_FEATURES)
 782                         return -ENOENT;
 783
 784                 /*
 785                  * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
 786                  * use the same feature set.
 787                  */
 788                 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
 789                     test_bit(i, vcpu->arch.features) != set)
 790                         return -EINVAL;
 791
 792                 if (set)
 793                         set_bit(i, vcpu->arch.features);
 794         }
 795
 796         vcpu->arch.target = phys_target;
 797
 798         /* Now we know what it is, we can reset it. */
 799         return kvm_reset_vcpu(vcpu);
 800 }
 801
 802
 803 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 804                                          struct kvm_vcpu_init *init)
 805 {
 806         int ret;
 807
 808         ret = kvm_vcpu_set_target(vcpu, init);
 809         if (ret)
 810                 return ret;
 811
 812         /*
 813          * Ensure a rebooted VM will fault in RAM pages and detect if the
 814          * guest MMU is turned off and flush the caches as needed.
 815          */
 816         if (vcpu->arch.has_run_once)
 817                 stage2_unmap_vm(vcpu->kvm);
 818
 819         vcpu_reset_hcr(vcpu);
 820
 821         /*
 822          * Handle the "start in power-off" case.
 823          */
 824         if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
 825                 vcpu->arch.power_off = true;
 826         else
 827                 vcpu->arch.power_off = false;
 828
 829         return 0;
 830 }
 831
 832 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
 833                                  struct kvm_device_attr *attr)
 834 {
 835         int ret = -ENXIO;
 836
 837         switch (attr->group) {
 838         default:
 839                 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
 840                 break;
 841         }
 842
 843         return ret;
 844 }
 845
 846 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
 847                                  struct kvm_device_attr *attr)
 848 {
 849         int ret = -ENXIO;
 850
 851         switch (attr->group) {
 852         default:
 853                 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
 854                 break;
 855         }
 856
 857         return ret;
 858 }
 859
 860 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
 861                                  struct kvm_device_attr *attr)
 862 {
 863         int ret = -ENXIO;
 864
 865         switch (attr->group) {
 866         default:
 867                 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
 868                 break;
 869         }
 870
 871         return ret;
 872 }
 873
 874 long kvm_arch_vcpu_ioctl(struct file *filp,
 875                          unsigned int ioctl, unsigned long arg)
 876 {
 877         struct kvm_vcpu *vcpu = filp->private_data;
 878         void __user *argp = (void __user *)arg;
 879         struct kvm_device_attr attr;
 880
 881         switch (ioctl) {
 882         case KVM_ARM_VCPU_INIT: {
 883                 struct kvm_vcpu_init init;
 884
 885                 if (copy_from_user(&init, argp, sizeof(init)))
 886                         return -EFAULT;
 887
 888                 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
 889         }
 890         case KVM_SET_ONE_REG:
 891         case KVM_GET_ONE_REG: {
 892                 struct kvm_one_reg reg;
 893
 894                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 895                         return -ENOEXEC;
 896
 897                 if (copy_from_user(&reg, argp, sizeof(reg)))
 898                         return -EFAULT;
 899                 if (ioctl == KVM_SET_ONE_REG)
 900                         return kvm_arm_set_reg(vcpu, &reg);
 901                 else
 902                         return kvm_arm_get_reg(vcpu, &reg);
 903         }
 904         case KVM_GET_REG_LIST: {
 905                 struct kvm_reg_list __user *user_list = argp;
 906                 struct kvm_reg_list reg_list;
 907                 unsigned n;
 908
 909                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 910                         return -ENOEXEC;
 911
 912                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 913                         return -EFAULT;
 914                 n = reg_list.n;
 915                 reg_list.n = kvm_arm_num_regs(vcpu);
 916                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 917                         return -EFAULT;
 918                 if (n < reg_list.n)
 919                         return -E2BIG;
 920                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 921         }
 922         case KVM_SET_DEVICE_ATTR: {
 923                 if (copy_from_user(&attr, argp, sizeof(attr)))
 924                         return -EFAULT;
 925                 return kvm_arm_vcpu_set_attr(vcpu, &attr);
 926         }
 927         case KVM_GET_DEVICE_ATTR: {
 928                 if (copy_from_user(&attr, argp, sizeof(attr)))
 929                         return -EFAULT;
 930                 return kvm_arm_vcpu_get_attr(vcpu, &attr);
 931         }
 932         case KVM_HAS_DEVICE_ATTR: {
 933                 if (copy_from_user(&attr, argp, sizeof(attr)))
 934                         return -EFAULT;
 935                 return kvm_arm_vcpu_has_attr(vcpu, &attr);
 936         }
 937         default:
 938                 return -EINVAL;
 939         }
 940 }
 941
 942 /**
 943  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
 944  * @kvm: kvm instance
 945  * @log: slot id and address to which we copy the log
 946  *
 947  * Steps 1-4 below provide general overview of dirty page logging. See
 948  * kvm_get_dirty_log_protect() function description for additional details.
 949  *
 950  * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
 951  * always flush the TLB (step 4) even if previous step failed  and the dirty
 952  * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
 953  * does not preclude user space subsequent dirty log read. Flushing TLB ensures
 954  * writes will be marked dirty for next log read.
 955  *
 956  *   1. Take a snapshot of the bit and clear it if needed.
 957  *   2. Write protect the corresponding page.
 958  *   3. Copy the snapshot to the userspace.
 959  *   4. Flush TLB's if needed.
 960  */
 961 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 962 {
 963         bool is_dirty = false;
 964         int r;
 965
 966         mutex_lock(&kvm->slots_lock);
 967
 968         r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
 969
 970         if (is_dirty)
 971                 kvm_flush_remote_tlbs(kvm);
 972
 973         mutex_unlock(&kvm->slots_lock);
 974         return r;
 975 }
 976
 977 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 978                                         struct kvm_arm_device_addr *dev_addr)
 979 {
 980         unsigned long dev_id, type;
 981
 982         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 983                 KVM_ARM_DEVICE_ID_SHIFT;
 984         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 985                 KVM_ARM_DEVICE_TYPE_SHIFT;
 986
 987         switch (dev_id) {
 988         case KVM_ARM_DEVICE_VGIC_V2:
 989                 if (!vgic_present)
 990                         return -ENXIO;
 991                 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
 992         default:
 993                 return -ENODEV;
 994         }
 995 }
 996
 997 long kvm_arch_vm_ioctl(struct file *filp,
 998                        unsigned int ioctl, unsigned long arg)
 999 {
1000         struct kvm *kvm = filp->private_data;
1001         void __user *argp = (void __user *)arg;
1002
1003         switch (ioctl) {
1004         case KVM_CREATE_IRQCHIP: {
1005                 if (!vgic_present)
1006                         return -ENXIO;
1007                 return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1008         }
1009         case KVM_ARM_SET_DEVICE_ADDR: {
1010                 struct kvm_arm_device_addr dev_addr;
1011
1012                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1013                         return -EFAULT;
1014                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1015         }
1016         case KVM_ARM_PREFERRED_TARGET: {
1017                 int err;
1018                 struct kvm_vcpu_init init;
1019
1020                 err = kvm_vcpu_preferred_target(&init);
1021                 if (err)
1022                         return err;
1023
1024                 if (copy_to_user(argp, &init, sizeof(init)))
1025                         return -EFAULT;
1026
1027                 return 0;
1028         }
1029         default:
1030                 return -EINVAL;
1031         }
1032 }
1033
1034 static void cpu_init_stage2(void *dummy)
1035 {
1036         __cpu_init_stage2();
1037 }
1038
1039 static void cpu_init_hyp_mode(void *dummy)
1040 {
1041         phys_addr_t boot_pgd_ptr;
1042         phys_addr_t pgd_ptr;
1043         unsigned long hyp_stack_ptr;
1044         unsigned long stack_page;
1045         unsigned long vector_ptr;
1046
1047         /* Switch from the HYP stub to our own HYP init vector */
1048         __hyp_set_vectors(kvm_get_idmap_vector());
1049
1050         boot_pgd_ptr = kvm_mmu_get_boot_httbr();
1051         pgd_ptr = kvm_mmu_get_httbr();
1052         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1053         hyp_stack_ptr = stack_page + PAGE_SIZE;
1054         vector_ptr = (unsigned long)__kvm_hyp_vector;
1055
1056         __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
1057         __cpu_init_stage2();
1058
1059         kvm_arm_init_debug();
1060 }
1061
1062 static int hyp_init_cpu_notify(struct notifier_block *self,
1063                                unsigned long action, void *cpu)
1064 {
1065         switch (action) {
1066         case CPU_STARTING:
1067         case CPU_STARTING_FROZEN:
1068                 if (__hyp_get_vectors() == hyp_default_vectors)
1069                         cpu_init_hyp_mode(NULL);
1070                 break;
1071         }
1072
1073         return NOTIFY_OK;
1074 }
1075
1076 static struct notifier_block hyp_init_cpu_nb = {
1077         .notifier_call = hyp_init_cpu_notify,
1078 };
1079
1080 #ifdef CONFIG_CPU_PM
1081 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1082                                     unsigned long cmd,
1083                                     void *v)
1084 {
1085         if (cmd == CPU_PM_EXIT &&
1086             __hyp_get_vectors() == hyp_default_vectors) {
1087                 cpu_init_hyp_mode(NULL);
1088                 return NOTIFY_OK;
1089         }
1090
1091         return NOTIFY_DONE;
1092 }
1093
1094 static struct notifier_block hyp_init_cpu_pm_nb = {
1095         .notifier_call = hyp_init_cpu_pm_notifier,
1096 };
1097
1098 static void __init hyp_cpu_pm_init(void)
1099 {
1100         cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1101 }
1102 #else
1103 static inline void hyp_cpu_pm_init(void)
1104 {
1105 }
1106 #endif
1107
1108 static void teardown_common_resources(void)
1109 {
1110         free_percpu(kvm_host_cpu_state);
1111 }
1112
1113 static int init_common_resources(void)
1114 {
1115         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1116         if (!kvm_host_cpu_state) {
1117                 kvm_err("Cannot allocate host CPU state\n");
1118                 return -ENOMEM;
1119         }
1120
1121         return 0;
1122 }
1123
1124 static int init_subsystems(void)
1125 {
1126         int err;
1127
1128         /*
1129          * Init HYP view of VGIC
1130          */
1131         err = kvm_vgic_hyp_init();
1132         switch (err) {
1133         case 0:
1134                 vgic_present = true;
1135                 break;
1136         case -ENODEV:
1137         case -ENXIO:
1138                 vgic_present = false;
1139                 break;
1140         default:
1141                 return err;
1142         }
1143
1144         /*
1145          * Init HYP architected timer support
1146          */
1147         err = kvm_timer_hyp_init();
1148         if (err)
1149                 return err;
1150
1151         kvm_perf_init();
1152         kvm_coproc_table_init();
1153
1154         return 0;
1155 }
1156
1157 static void teardown_hyp_mode(void)
1158 {
1159         int cpu;
1160
1161         if (is_kernel_in_hyp_mode())
1162                 return;
1163
1164         free_hyp_pgds();
1165         for_each_possible_cpu(cpu)
1166                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1167 }
1168
1169 static int init_vhe_mode(void)
1170 {
1171         /*
1172          * Execute the init code on each CPU.
1173          */
1174         on_each_cpu(cpu_init_stage2, NULL, 1);
1175
1176         /* set size of VMID supported by CPU */
1177         kvm_vmid_bits = kvm_get_vmid_bits();
1178         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1179
1180         kvm_info("VHE mode initialized successfully\n");
1181         return 0;
1182 }
1183
1184 /**
1185  * Inits Hyp-mode on all online CPUs
1186  */
1187 static int init_hyp_mode(void)
1188 {
1189         int cpu;
1190         int err = 0;
1191
1192         /*
1193          * Allocate Hyp PGD and setup Hyp identity mapping
1194          */
1195         err = kvm_mmu_init();
1196         if (err)
1197                 goto out_err;
1198
1199         /*
1200          * It is probably enough to obtain the default on one
1201          * CPU. It's unlikely to be different on the others.
1202          */
1203         hyp_default_vectors = __hyp_get_vectors();
1204
1205         /*
1206          * Allocate stack pages for Hypervisor-mode
1207          */
1208         for_each_possible_cpu(cpu) {
1209                 unsigned long stack_page;
1210
1211                 stack_page = __get_free_page(GFP_KERNEL);
1212                 if (!stack_page) {
1213                         err = -ENOMEM;
1214                         goto out_err;
1215                 }
1216
1217                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1218         }
1219
1220         /*
1221          * Map the Hyp-code called directly from the host
1222          */
1223         err = create_hyp_mappings(__hyp_text_start, __hyp_text_end);
1224         if (err) {
1225                 kvm_err("Cannot map world-switch code\n");
1226                 goto out_err;
1227         }
1228
1229         err = create_hyp_mappings(__start_rodata, __end_rodata);
1230         if (err) {
1231                 kvm_err("Cannot map rodata section\n");
1232                 goto out_err;
1233         }
1234
1235         /*
1236          * Map the Hyp stack pages
1237          */
1238         for_each_possible_cpu(cpu) {
1239                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1240                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
1241
1242                 if (err) {
1243                         kvm_err("Cannot map hyp stack\n");
1244                         goto out_err;
1245                 }
1246         }
1247
1248         for_each_possible_cpu(cpu) {
1249                 kvm_cpu_context_t *cpu_ctxt;
1250
1251                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1252                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
1253
1254                 if (err) {
1255                         kvm_err("Cannot map host CPU state: %d\n", err);
1256                         goto out_err;
1257                 }
1258         }
1259
1260         /*
1261          * Execute the init code on each CPU.
1262          */
1263         on_each_cpu(cpu_init_hyp_mode, NULL, 1);
1264
1265 #ifndef CONFIG_HOTPLUG_CPU
1266         free_boot_hyp_pgd();
1267 #endif
1268
1269         cpu_notifier_register_begin();
1270
1271         err = __register_cpu_notifier(&hyp_init_cpu_nb);
1272
1273         cpu_notifier_register_done();
1274
1275         if (err) {
1276                 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
1277                 goto out_err;
1278         }
1279
1280         hyp_cpu_pm_init();
1281
1282         /* set size of VMID supported by CPU */
1283         kvm_vmid_bits = kvm_get_vmid_bits();
1284         kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1285
1286         kvm_info("Hyp mode initialized successfully\n");
1287
1288         return 0;
1289
1290 out_err:
1291         teardown_hyp_mode();
1292         kvm_err("error initializing Hyp mode: %d\n", err);
1293         return err;
1294 }
1295
1296 static void check_kvm_target_cpu(void *ret)
1297 {
1298         *(int *)ret = kvm_target_cpu();
1299 }
1300
1301 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1302 {
1303         struct kvm_vcpu *vcpu;
1304         int i;
1305
1306         mpidr &= MPIDR_HWID_BITMASK;
1307         kvm_for_each_vcpu(i, vcpu, kvm) {
1308                 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1309                         return vcpu;
1310         }
1311         return NULL;
1312 }
1313
1314 /**
1315  * Initialize Hyp-mode and memory mappings on all CPUs.
1316  */
1317 int kvm_arch_init(void *opaque)
1318 {
1319         int err;
1320         int ret, cpu;
1321
1322         if (!is_hyp_mode_available()) {
1323                 kvm_err("HYP mode not available\n");
1324                 return -ENODEV;
1325         }
1326
1327         for_each_online_cpu(cpu) {
1328                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1329                 if (ret < 0) {
1330                         kvm_err("Error, CPU %d not supported!\n", cpu);
1331                         return -ENODEV;
1332                 }
1333         }
1334
1335         err = init_common_resources();
1336         if (err)
1337                 return err;
1338
1339         if (is_kernel_in_hyp_mode())
1340                 err = init_vhe_mode();
1341         else
1342                 err = init_hyp_mode();
1343         if (err)
1344                 goto out_err;
1345
1346         err = init_subsystems();
1347         if (err)
1348                 goto out_hyp;
1349
1350         return 0;
1351
1352 out_hyp:
1353         teardown_hyp_mode();
1354 out_err:
1355         teardown_common_resources();
1356         return err;
1357 }
1358
1359 /* NOP: Compiling as a module not supported */
1360 void kvm_arch_exit(void)
1361 {
1362         kvm_perf_teardown();
1363 }
1364
1365 static int arm_init(void)
1366 {
1367         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1368         return rc;
1369 }
1370
1371 module_init(arm_init);