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/errno.h>
  21 #include <linux/err.h>
  22 #include <linux/kvm_host.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/fs.h>
  26 #include <linux/mman.h>
  27 #include <linux/sched.h>
  28 #include <linux/kvm.h>
  29 #include <trace/events/kvm.h>
  30
  31 #define CREATE_TRACE_POINTS
  32 #include "trace.h"
  33
  34 #include <asm/uaccess.h>
  35 #include <asm/ptrace.h>
  36 #include <asm/mman.h>
  37 #include <asm/tlbflush.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/virt.h>
  40 #include <asm/kvm_arm.h>
  41 #include <asm/kvm_asm.h>
  42 #include <asm/kvm_mmu.h>
  43 #include <asm/kvm_emulate.h>
  44 #include <asm/kvm_coproc.h>
  45 #include <asm/kvm_psci.h>
  46
  47 #ifdef REQUIRES_VIRT
  48 __asm__(".arch_extension        virt");
  49 #endif
  50
  51 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
  52 static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
  53 static unsigned long hyp_default_vectors;
  54
  55 /* Per-CPU variable containing the currently running vcpu. */
  56 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
  57
  58 /* The VMID used in the VTTBR */
  59 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
  60 static u8 kvm_next_vmid;
  61 static DEFINE_SPINLOCK(kvm_vmid_lock);
  62
  63 static bool vgic_present;
  64
  65 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  66 {
  67         BUG_ON(preemptible());
  68         __this_cpu_write(kvm_arm_running_vcpu, vcpu);
  69 }
  70
  71 /**
  72  * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
  73  * Must be called from non-preemptible context
  74  */
  75 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
  76 {
  77         BUG_ON(preemptible());
  78         return __this_cpu_read(kvm_arm_running_vcpu);
  79 }
  80
  81 /**
  82  * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
  83  */
  84 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void)
  85 {
  86         return &kvm_arm_running_vcpu;
  87 }
  88
  89 int kvm_arch_hardware_enable(void *garbage)
  90 {
  91         return 0;
  92 }
  93
  94 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  95 {
  96         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
  97 }
  98
  99 void kvm_arch_hardware_disable(void *garbage)
 100 {
 101 }
 102
 103 int kvm_arch_hardware_setup(void)
 104 {
 105         return 0;
 106 }
 107
 108 void kvm_arch_hardware_unsetup(void)
 109 {
 110 }
 111
 112 void kvm_arch_check_processor_compat(void *rtn)
 113 {
 114         *(int *)rtn = 0;
 115 }
 116
 117 void kvm_arch_sync_events(struct kvm *kvm)
 118 {
 119 }
 120
 121 /**
 122  * kvm_arch_init_vm - initializes a VM data structure
 123  * @kvm:        pointer to the KVM struct
 124  */
 125 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 126 {
 127         int ret = 0;
 128
 129         if (type)
 130                 return -EINVAL;
 131
 132         ret = kvm_alloc_stage2_pgd(kvm);
 133         if (ret)
 134                 goto out_fail_alloc;
 135
 136         ret = create_hyp_mappings(kvm, kvm + 1);
 137         if (ret)
 138                 goto out_free_stage2_pgd;
 139
 140         /* Mark the initial VMID generation invalid */
 141         kvm->arch.vmid_gen = 0;
 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 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 156                            struct kvm_memory_slot *dont)
 157 {
 158 }
 159
 160 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
 161 {
 162         return 0;
 163 }
 164
 165 /**
 166  * kvm_arch_destroy_vm - destroy the VM data structure
 167  * @kvm:        pointer to the KVM struct
 168  */
 169 void kvm_arch_destroy_vm(struct kvm *kvm)
 170 {
 171         int i;
 172
 173         kvm_free_stage2_pgd(kvm);
 174
 175         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 176                 if (kvm->vcpus[i]) {
 177                         kvm_arch_vcpu_free(kvm->vcpus[i]);
 178                         kvm->vcpus[i] = NULL;
 179                 }
 180         }
 181 }
 182
 183 int kvm_dev_ioctl_check_extension(long ext)
 184 {
 185         int r;
 186         switch (ext) {
 187         case KVM_CAP_IRQCHIP:
 188                 r = vgic_present;
 189                 break;
 190         case KVM_CAP_USER_MEMORY:
 191         case KVM_CAP_SYNC_MMU:
 192         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
 193         case KVM_CAP_ONE_REG:
 194         case KVM_CAP_ARM_PSCI:
 195                 r = 1;
 196                 break;
 197         case KVM_CAP_COALESCED_MMIO:
 198                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 199                 break;
 200         case KVM_CAP_ARM_SET_DEVICE_ADDR:
 201                 r = 1;
 202                 break;
 203         case KVM_CAP_NR_VCPUS:
 204                 r = num_online_cpus();
 205                 break;
 206         case KVM_CAP_MAX_VCPUS:
 207                 r = KVM_MAX_VCPUS;
 208                 break;
 209         default:
 210                 r = kvm_arch_dev_ioctl_check_extension(ext);
 211                 break;
 212         }
 213         return r;
 214 }
 215
 216 long kvm_arch_dev_ioctl(struct file *filp,
 217                         unsigned int ioctl, unsigned long arg)
 218 {
 219         return -EINVAL;
 220 }
 221
 222 void kvm_arch_memslots_updated(struct kvm *kvm)
 223 {
 224 }
 225
 226 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 227                                    struct kvm_memory_slot *memslot,
 228                                    struct kvm_userspace_memory_region *mem,
 229                                    enum kvm_mr_change change)
 230 {
 231         return 0;
 232 }
 233
 234 void kvm_arch_commit_memory_region(struct kvm *kvm,
 235                                    struct kvm_userspace_memory_region *mem,
 236                                    const struct kvm_memory_slot *old,
 237                                    enum kvm_mr_change change)
 238 {
 239 }
 240
 241 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 242 {
 243 }
 244
 245 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 246                                    struct kvm_memory_slot *slot)
 247 {
 248 }
 249
 250 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 251 {
 252         int err;
 253         struct kvm_vcpu *vcpu;
 254
 255         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 256         if (!vcpu) {
 257                 err = -ENOMEM;
 258                 goto out;
 259         }
 260
 261         err = kvm_vcpu_init(vcpu, kvm, id);
 262         if (err)
 263                 goto free_vcpu;
 264
 265         err = create_hyp_mappings(vcpu, vcpu + 1);
 266         if (err)
 267                 goto vcpu_uninit;
 268
 269         return vcpu;
 270 vcpu_uninit:
 271         kvm_vcpu_uninit(vcpu);
 272 free_vcpu:
 273         kmem_cache_free(kvm_vcpu_cache, vcpu);
 274 out:
 275         return ERR_PTR(err);
 276 }
 277
 278 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 279 {
 280         return 0;
 281 }
 282
 283 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 284 {
 285         kvm_mmu_free_memory_caches(vcpu);
 286         kvm_timer_vcpu_terminate(vcpu);
 287         kmem_cache_free(kvm_vcpu_cache, vcpu);
 288 }
 289
 290 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 291 {
 292         kvm_arch_vcpu_free(vcpu);
 293 }
 294
 295 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 296 {
 297         return 0;
 298 }
 299
 300 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 301 {
 302         int ret;
 303
 304         /* Force users to call KVM_ARM_VCPU_INIT */
 305         vcpu->arch.target = -1;
 306
 307         /* Set up VGIC */
 308         ret = kvm_vgic_vcpu_init(vcpu);
 309         if (ret)
 310                 return ret;
 311
 312         /* Set up the timer */
 313         kvm_timer_vcpu_init(vcpu);
 314
 315         return 0;
 316 }
 317
 318 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 319 {
 320 }
 321
 322 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 323 {
 324         vcpu->cpu = cpu;
 325         vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
 326
 327         /*
 328          * Check whether this vcpu requires the cache to be flushed on
 329          * this physical CPU. This is a consequence of doing dcache
 330          * operations by set/way on this vcpu. We do it here to be in
 331          * a non-preemptible section.
 332          */
 333         if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
 334                 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
 335
 336         kvm_arm_set_running_vcpu(vcpu);
 337 }
 338
 339 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 340 {
 341         kvm_arm_set_running_vcpu(NULL);
 342 }
 343
 344 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 345                                         struct kvm_guest_debug *dbg)
 346 {
 347         return -EINVAL;
 348 }
 349
 350
 351 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 352                                     struct kvm_mp_state *mp_state)
 353 {
 354         return -EINVAL;
 355 }
 356
 357 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 358                                     struct kvm_mp_state *mp_state)
 359 {
 360         return -EINVAL;
 361 }
 362
 363 /**
 364  * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 365  * @v:          The VCPU pointer
 366  *
 367  * If the guest CPU is not waiting for interrupts or an interrupt line is
 368  * asserted, the CPU is by definition runnable.
 369  */
 370 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 371 {
 372         return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
 373 }
 374
 375 /* Just ensure a guest exit from a particular CPU */
 376 static void exit_vm_noop(void *info)
 377 {
 378 }
 379
 380 void force_vm_exit(const cpumask_t *mask)
 381 {
 382         smp_call_function_many(mask, exit_vm_noop, NULL, true);
 383 }
 384
 385 /**
 386  * need_new_vmid_gen - check that the VMID is still valid
 387  * @kvm: The VM's VMID to checkt
 388  *
 389  * return true if there is a new generation of VMIDs being used
 390  *
 391  * The hardware supports only 256 values with the value zero reserved for the
 392  * host, so we check if an assigned value belongs to a previous generation,
 393  * which which requires us to assign a new value. If we're the first to use a
 394  * VMID for the new generation, we must flush necessary caches and TLBs on all
 395  * CPUs.
 396  */
 397 static bool need_new_vmid_gen(struct kvm *kvm)
 398 {
 399         return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
 400 }
 401
 402 /**
 403  * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
 404  * @kvm The guest that we are about to run
 405  *
 406  * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
 407  * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
 408  * caches and TLBs.
 409  */
 410 static void update_vttbr(struct kvm *kvm)
 411 {
 412         phys_addr_t pgd_phys;
 413         u64 vmid;
 414
 415         if (!need_new_vmid_gen(kvm))
 416                 return;
 417
 418         spin_lock(&kvm_vmid_lock);
 419
 420         /*
 421          * We need to re-check the vmid_gen here to ensure that if another vcpu
 422          * already allocated a valid vmid for this vm, then this vcpu should
 423          * use the same vmid.
 424          */
 425         if (!need_new_vmid_gen(kvm)) {
 426                 spin_unlock(&kvm_vmid_lock);
 427                 return;
 428         }
 429
 430         /* First user of a new VMID generation? */
 431         if (unlikely(kvm_next_vmid == 0)) {
 432                 atomic64_inc(&kvm_vmid_gen);
 433                 kvm_next_vmid = 1;
 434
 435                 /*
 436                  * On SMP we know no other CPUs can use this CPU's or each
 437                  * other's VMID after force_vm_exit returns since the
 438                  * kvm_vmid_lock blocks them from reentry to the guest.
 439                  */
 440                 force_vm_exit(cpu_all_mask);
 441                 /*
 442                  * Now broadcast TLB + ICACHE invalidation over the inner
 443                  * shareable domain to make sure all data structures are
 444                  * clean.
 445                  */
 446                 kvm_call_hyp(__kvm_flush_vm_context);
 447         }
 448
 449         kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
 450         kvm->arch.vmid = kvm_next_vmid;
 451         kvm_next_vmid++;
 452
 453         /* update vttbr to be used with the new vmid */
 454         pgd_phys = virt_to_phys(kvm->arch.pgd);
 455         vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
 456         kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
 457         kvm->arch.vttbr |= vmid;
 458
 459         spin_unlock(&kvm_vmid_lock);
 460 }
 461
 462 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 463 {
 464         if (likely(vcpu->arch.has_run_once))
 465                 return 0;
 466
 467         vcpu->arch.has_run_once = true;
 468
 469         /*
 470          * Initialize the VGIC before running a vcpu the first time on
 471          * this VM.
 472          */
 473         if (irqchip_in_kernel(vcpu->kvm) &&
 474             unlikely(!vgic_initialized(vcpu->kvm))) {
 475                 int ret = kvm_vgic_init(vcpu->kvm);
 476                 if (ret)
 477                         return ret;
 478         }
 479
 480         /*
 481          * Handle the "start in power-off" case by calling into the
 482          * PSCI code.
 483          */
 484         if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) {
 485                 *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF;
 486                 kvm_psci_call(vcpu);
 487         }
 488
 489         return 0;
 490 }
 491
 492 static void vcpu_pause(struct kvm_vcpu *vcpu)
 493 {
 494         wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
 495
 496         wait_event_interruptible(*wq, !vcpu->arch.pause);
 497 }
 498
 499 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
 500 {
 501         return vcpu->arch.target >= 0;
 502 }
 503
 504 /**
 505  * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 506  * @vcpu:       The VCPU pointer
 507  * @run:        The kvm_run structure pointer used for userspace state exchange
 508  *
 509  * This function is called through the VCPU_RUN ioctl called from user space. It
 510  * will execute VM code in a loop until the time slice for the process is used
 511  * or some emulation is needed from user space in which case the function will
 512  * return with return value 0 and with the kvm_run structure filled in with the
 513  * required data for the requested emulation.
 514  */
 515 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 516 {
 517         int ret;
 518         sigset_t sigsaved;
 519
 520         if (unlikely(!kvm_vcpu_initialized(vcpu)))
 521                 return -ENOEXEC;
 522
 523         ret = kvm_vcpu_first_run_init(vcpu);
 524         if (ret)
 525                 return ret;
 526
 527         if (run->exit_reason == KVM_EXIT_MMIO) {
 528                 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 529                 if (ret)
 530                         return ret;
 531         }
 532
 533         if (vcpu->sigset_active)
 534                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 535
 536         ret = 1;
 537         run->exit_reason = KVM_EXIT_UNKNOWN;
 538         while (ret > 0) {
 539                 /*
 540                  * Check conditions before entering the guest
 541                  */
 542                 cond_resched();
 543
 544                 update_vttbr(vcpu->kvm);
 545
 546                 if (vcpu->arch.pause)
 547                         vcpu_pause(vcpu);
 548
 549                 kvm_vgic_flush_hwstate(vcpu);
 550                 kvm_timer_flush_hwstate(vcpu);
 551
 552                 local_irq_disable();
 553
 554                 /*
 555                  * Re-check atomic conditions
 556                  */
 557                 if (signal_pending(current)) {
 558                         ret = -EINTR;
 559                         run->exit_reason = KVM_EXIT_INTR;
 560                 }
 561
 562                 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
 563                         local_irq_enable();
 564                         kvm_timer_sync_hwstate(vcpu);
 565                         kvm_vgic_sync_hwstate(vcpu);
 566                         continue;
 567                 }
 568
 569                 /**************************************************************
 570                  * Enter the guest
 571                  */
 572                 trace_kvm_entry(*vcpu_pc(vcpu));
 573                 kvm_guest_enter();
 574                 vcpu->mode = IN_GUEST_MODE;
 575
 576                 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
 577
 578                 vcpu->mode = OUTSIDE_GUEST_MODE;
 579                 vcpu->arch.last_pcpu = smp_processor_id();
 580                 kvm_guest_exit();
 581                 trace_kvm_exit(*vcpu_pc(vcpu));
 582                 /*
 583                  * We may have taken a host interrupt in HYP mode (ie
 584                  * while executing the guest). This interrupt is still
 585                  * pending, as we haven't serviced it yet!
 586                  *
 587                  * We're now back in SVC mode, with interrupts
 588                  * disabled.  Enabling the interrupts now will have
 589                  * the effect of taking the interrupt again, in SVC
 590                  * mode this time.
 591                  */
 592                 local_irq_enable();
 593
 594                 /*
 595                  * Back from guest
 596                  *************************************************************/
 597
 598                 kvm_timer_sync_hwstate(vcpu);
 599                 kvm_vgic_sync_hwstate(vcpu);
 600
 601                 ret = handle_exit(vcpu, run, ret);
 602         }
 603
 604         if (vcpu->sigset_active)
 605                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 606         return ret;
 607 }
 608
 609 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
 610 {
 611         int bit_index;
 612         bool set;
 613         unsigned long *ptr;
 614
 615         if (number == KVM_ARM_IRQ_CPU_IRQ)
 616                 bit_index = __ffs(HCR_VI);
 617         else /* KVM_ARM_IRQ_CPU_FIQ */
 618                 bit_index = __ffs(HCR_VF);
 619
 620         ptr = (unsigned long *)&vcpu->arch.irq_lines;
 621         if (level)
 622                 set = test_and_set_bit(bit_index, ptr);
 623         else
 624                 set = test_and_clear_bit(bit_index, ptr);
 625
 626         /*
 627          * If we didn't change anything, no need to wake up or kick other CPUs
 628          */
 629         if (set == level)
 630                 return 0;
 631
 632         /*
 633          * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
 634          * trigger a world-switch round on the running physical CPU to set the
 635          * virtual IRQ/FIQ fields in the HCR appropriately.
 636          */
 637         kvm_vcpu_kick(vcpu);
 638
 639         return 0;
 640 }
 641
 642 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 643                           bool line_status)
 644 {
 645         u32 irq = irq_level->irq;
 646         unsigned int irq_type, vcpu_idx, irq_num;
 647         int nrcpus = atomic_read(&kvm->online_vcpus);
 648         struct kvm_vcpu *vcpu = NULL;
 649         bool level = irq_level->level;
 650
 651         irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
 652         vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
 653         irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 654
 655         trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
 656
 657         switch (irq_type) {
 658         case KVM_ARM_IRQ_TYPE_CPU:
 659                 if (irqchip_in_kernel(kvm))
 660                         return -ENXIO;
 661
 662                 if (vcpu_idx >= nrcpus)
 663                         return -EINVAL;
 664
 665                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 666                 if (!vcpu)
 667                         return -EINVAL;
 668
 669                 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
 670                         return -EINVAL;
 671
 672                 return vcpu_interrupt_line(vcpu, irq_num, level);
 673         case KVM_ARM_IRQ_TYPE_PPI:
 674                 if (!irqchip_in_kernel(kvm))
 675                         return -ENXIO;
 676
 677                 if (vcpu_idx >= nrcpus)
 678                         return -EINVAL;
 679
 680                 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
 681                 if (!vcpu)
 682                         return -EINVAL;
 683
 684                 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
 685                         return -EINVAL;
 686
 687                 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
 688         case KVM_ARM_IRQ_TYPE_SPI:
 689                 if (!irqchip_in_kernel(kvm))
 690                         return -ENXIO;
 691
 692                 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
 693                     irq_num > KVM_ARM_IRQ_GIC_MAX)
 694                         return -EINVAL;
 695
 696                 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
 697         }
 698
 699         return -EINVAL;
 700 }
 701
 702 long kvm_arch_vcpu_ioctl(struct file *filp,
 703                          unsigned int ioctl, unsigned long arg)
 704 {
 705         struct kvm_vcpu *vcpu = filp->private_data;
 706         void __user *argp = (void __user *)arg;
 707
 708         switch (ioctl) {
 709         case KVM_ARM_VCPU_INIT: {
 710                 struct kvm_vcpu_init init;
 711
 712                 if (copy_from_user(&init, argp, sizeof(init)))
 713                         return -EFAULT;
 714
 715                 return kvm_vcpu_set_target(vcpu, &init);
 716
 717         }
 718         case KVM_SET_ONE_REG:
 719         case KVM_GET_ONE_REG: {
 720                 struct kvm_one_reg reg;
 721
 722                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 723                         return -ENOEXEC;
 724
 725                 if (copy_from_user(&reg, argp, sizeof(reg)))
 726                         return -EFAULT;
 727                 if (ioctl == KVM_SET_ONE_REG)
 728                         return kvm_arm_set_reg(vcpu, &reg);
 729                 else
 730                         return kvm_arm_get_reg(vcpu, &reg);
 731         }
 732         case KVM_GET_REG_LIST: {
 733                 struct kvm_reg_list __user *user_list = argp;
 734                 struct kvm_reg_list reg_list;
 735                 unsigned n;
 736
 737                 if (unlikely(!kvm_vcpu_initialized(vcpu)))
 738                         return -ENOEXEC;
 739
 740                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 741                         return -EFAULT;
 742                 n = reg_list.n;
 743                 reg_list.n = kvm_arm_num_regs(vcpu);
 744                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 745                         return -EFAULT;
 746                 if (n < reg_list.n)
 747                         return -E2BIG;
 748                 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
 749         }
 750         default:
 751                 return -EINVAL;
 752         }
 753 }
 754
 755 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 756 {
 757         return -EINVAL;
 758 }
 759
 760 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
 761                                         struct kvm_arm_device_addr *dev_addr)
 762 {
 763         unsigned long dev_id, type;
 764
 765         dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
 766                 KVM_ARM_DEVICE_ID_SHIFT;
 767         type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
 768                 KVM_ARM_DEVICE_TYPE_SHIFT;
 769
 770         switch (dev_id) {
 771         case KVM_ARM_DEVICE_VGIC_V2:
 772                 if (!vgic_present)
 773                         return -ENXIO;
 774                 return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
 775         default:
 776                 return -ENODEV;
 777         }
 778 }
 779
 780 long kvm_arch_vm_ioctl(struct file *filp,
 781                        unsigned int ioctl, unsigned long arg)
 782 {
 783         struct kvm *kvm = filp->private_data;
 784         void __user *argp = (void __user *)arg;
 785
 786         switch (ioctl) {
 787         case KVM_CREATE_IRQCHIP: {
 788                 if (vgic_present)
 789                         return kvm_vgic_create(kvm);
 790                 else
 791                         return -ENXIO;
 792         }
 793         case KVM_ARM_SET_DEVICE_ADDR: {
 794                 struct kvm_arm_device_addr dev_addr;
 795
 796                 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
 797                         return -EFAULT;
 798                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
 799         }
 800         default:
 801                 return -EINVAL;
 802         }
 803 }
 804
 805 static void cpu_init_hyp_mode(void *dummy)
 806 {
 807         phys_addr_t boot_pgd_ptr;
 808         phys_addr_t pgd_ptr;
 809         unsigned long hyp_stack_ptr;
 810         unsigned long stack_page;
 811         unsigned long vector_ptr;
 812
 813         /* Switch from the HYP stub to our own HYP init vector */
 814         __hyp_set_vectors(kvm_get_idmap_vector());
 815
 816         boot_pgd_ptr = kvm_mmu_get_boot_httbr();
 817         pgd_ptr = kvm_mmu_get_httbr();
 818         stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
 819         hyp_stack_ptr = stack_page + PAGE_SIZE;
 820         vector_ptr = (unsigned long)__kvm_hyp_vector;
 821
 822         __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
 823 }
 824
 825 static int hyp_init_cpu_notify(struct notifier_block *self,
 826                                unsigned long action, void *cpu)
 827 {
 828         switch (action) {
 829         case CPU_STARTING:
 830         case CPU_STARTING_FROZEN:
 831                 cpu_init_hyp_mode(NULL);
 832                 break;
 833         }
 834
 835         return NOTIFY_OK;
 836 }
 837
 838 static struct notifier_block hyp_init_cpu_nb = {
 839         .notifier_call = hyp_init_cpu_notify,
 840 };
 841
 842 /**
 843  * Inits Hyp-mode on all online CPUs
 844  */
 845 static int init_hyp_mode(void)
 846 {
 847         int cpu;
 848         int err = 0;
 849
 850         /*
 851          * Allocate Hyp PGD and setup Hyp identity mapping
 852          */
 853         err = kvm_mmu_init();
 854         if (err)
 855                 goto out_err;
 856
 857         /*
 858          * It is probably enough to obtain the default on one
 859          * CPU. It's unlikely to be different on the others.
 860          */
 861         hyp_default_vectors = __hyp_get_vectors();
 862
 863         /*
 864          * Allocate stack pages for Hypervisor-mode
 865          */
 866         for_each_possible_cpu(cpu) {
 867                 unsigned long stack_page;
 868
 869                 stack_page = __get_free_page(GFP_KERNEL);
 870                 if (!stack_page) {
 871                         err = -ENOMEM;
 872                         goto out_free_stack_pages;
 873                 }
 874
 875                 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
 876         }
 877
 878         /*
 879          * Map the Hyp-code called directly from the host
 880          */
 881         err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
 882         if (err) {
 883                 kvm_err("Cannot map world-switch code\n");
 884                 goto out_free_mappings;
 885         }
 886
 887         /*
 888          * Map the Hyp stack pages
 889          */
 890         for_each_possible_cpu(cpu) {
 891                 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
 892                 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
 893
 894                 if (err) {
 895                         kvm_err("Cannot map hyp stack\n");
 896                         goto out_free_mappings;
 897                 }
 898         }
 899
 900         /*
 901          * Map the host CPU structures
 902          */
 903         kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
 904         if (!kvm_host_cpu_state) {
 905                 err = -ENOMEM;
 906                 kvm_err("Cannot allocate host CPU state\n");
 907                 goto out_free_mappings;
 908         }
 909
 910         for_each_possible_cpu(cpu) {
 911                 kvm_cpu_context_t *cpu_ctxt;
 912
 913                 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
 914                 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
 915
 916                 if (err) {
 917                         kvm_err("Cannot map host CPU state: %d\n", err);
 918                         goto out_free_context;
 919                 }
 920         }
 921
 922         /*
 923          * Execute the init code on each CPU.
 924          */
 925         on_each_cpu(cpu_init_hyp_mode, NULL, 1);
 926
 927         /*
 928          * Init HYP view of VGIC
 929          */
 930         err = kvm_vgic_hyp_init();
 931         if (err)
 932                 goto out_free_context;
 933
 934 #ifdef CONFIG_KVM_ARM_VGIC
 935                 vgic_present = true;
 936 #endif
 937
 938         /*
 939          * Init HYP architected timer support
 940          */
 941         err = kvm_timer_hyp_init();
 942         if (err)
 943                 goto out_free_mappings;
 944
 945 #ifndef CONFIG_HOTPLUG_CPU
 946         free_boot_hyp_pgd();
 947 #endif
 948
 949         kvm_perf_init();
 950
 951         kvm_info("Hyp mode initialized successfully\n");
 952
 953         return 0;
 954 out_free_context:
 955         free_percpu(kvm_host_cpu_state);
 956 out_free_mappings:
 957         free_hyp_pgds();
 958 out_free_stack_pages:
 959         for_each_possible_cpu(cpu)
 960                 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
 961 out_err:
 962         kvm_err("error initializing Hyp mode: %d\n", err);
 963         return err;
 964 }
 965
 966 static void check_kvm_target_cpu(void *ret)
 967 {
 968         *(int *)ret = kvm_target_cpu();
 969 }
 970
 971 /**
 972  * Initialize Hyp-mode and memory mappings on all CPUs.
 973  */
 974 int kvm_arch_init(void *opaque)
 975 {
 976         int err;
 977         int ret, cpu;
 978
 979         if (!is_hyp_mode_available()) {
 980                 kvm_err("HYP mode not available\n");
 981                 return -ENODEV;
 982         }
 983
 984         for_each_online_cpu(cpu) {
 985                 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
 986                 if (ret < 0) {
 987                         kvm_err("Error, CPU %d not supported!\n", cpu);
 988                         return -ENODEV;
 989                 }
 990         }
 991
 992         err = init_hyp_mode();
 993         if (err)
 994                 goto out_err;
 995
 996         err = register_cpu_notifier(&hyp_init_cpu_nb);
 997         if (err) {
 998                 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
 999                 goto out_err;
1000         }
1001
1002         kvm_coproc_table_init();
1003         return 0;
1004 out_err:
1005         return err;
1006 }
1007
1008 /* NOP: Compiling as a module not supported */
1009 void kvm_arch_exit(void)
1010 {
1011         kvm_perf_teardown();
1012 }
1013
1014 static int arm_init(void)
1015 {
1016         int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1017         return rc;
1018 }
1019
1020 module_init(arm_init);