virt/kvm/kvm_main.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "iodev.h"
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/percpu.h>
  25 #include <linux/gfp.h>
  26 #include <linux/mm.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/reboot.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/highmem.h>
  32 #include <linux/file.h>
  33 #include <linux/sysdev.h>
  34 #include <linux/cpu.h>
  35 #include <linux/sched.h>
  36 #include <linux/cpumask.h>
  37 #include <linux/smp.h>
  38 #include <linux/anon_inodes.h>
  39 #include <linux/profile.h>
  40 #include <linux/kvm_para.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/mman.h>
  43 #include <linux/swap.h>
  44 #include <linux/bitops.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/compat.h>
  47
  48 #include <asm/processor.h>
  49 #include <asm/io.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/pgtable.h>
  52 #include <asm-generic/bitops/le.h>
  53
  54 #include "coalesced_mmio.h"
  55
  56 #define CREATE_TRACE_POINTS
  57 #include <trace/events/kvm.h>
  58
  59 MODULE_AUTHOR("Qumranet");
  60 MODULE_LICENSE("GPL");
  61
  62 /*
  63  * Ordering of locks:
  64  *
  65  *              kvm->lock --> kvm->slots_lock --> kvm->irq_lock
  66  */
  67
  68 DEFINE_SPINLOCK(kvm_lock);
  69 LIST_HEAD(vm_list);
  70
  71 static cpumask_var_t cpus_hardware_enabled;
  72 static int kvm_usage_count = 0;
  73 static atomic_t hardware_enable_failed;
  74
  75 struct kmem_cache *kvm_vcpu_cache;
  76 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  77
  78 static __read_mostly struct preempt_ops kvm_preempt_ops;
  79
  80 struct dentry *kvm_debugfs_dir;
  81
  82 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  83                            unsigned long arg);
  84 static int hardware_enable_all(void);
  85 static void hardware_disable_all(void);
  86
  87 static bool kvm_rebooting;
  88
  89 static bool largepages_enabled = true;
  90
  91 inline int kvm_is_mmio_pfn(pfn_t pfn)
  92 {
  93         if (pfn_valid(pfn)) {
  94                 struct page *page = compound_head(pfn_to_page(pfn));
  95                 return PageReserved(page);
  96         }
  97
  98         return true;
  99 }
 100
 101 /*
 102  * Switches to specified vcpu, until a matching vcpu_put()
 103  */
 104 void vcpu_load(struct kvm_vcpu *vcpu)
 105 {
 106         int cpu;
 107
 108         mutex_lock(&vcpu->mutex);
 109         cpu = get_cpu();
 110         preempt_notifier_register(&vcpu->preempt_notifier);
 111         kvm_arch_vcpu_load(vcpu, cpu);
 112         put_cpu();
 113 }
 114
 115 void vcpu_put(struct kvm_vcpu *vcpu)
 116 {
 117         preempt_disable();
 118         kvm_arch_vcpu_put(vcpu);
 119         preempt_notifier_unregister(&vcpu->preempt_notifier);
 120         preempt_enable();
 121         mutex_unlock(&vcpu->mutex);
 122 }
 123
 124 static void ack_flush(void *_completed)
 125 {
 126 }
 127
 128 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 129 {
 130         int i, cpu, me;
 131         cpumask_var_t cpus;
 132         bool called = true;
 133         struct kvm_vcpu *vcpu;
 134
 135         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
 136
 137         spin_lock(&kvm->requests_lock);
 138         me = smp_processor_id();
 139         kvm_for_each_vcpu(i, vcpu, kvm) {
 140                 if (test_and_set_bit(req, &vcpu->requests))
 141                         continue;
 142                 cpu = vcpu->cpu;
 143                 if (cpus != NULL && cpu != -1 && cpu != me)
 144                         cpumask_set_cpu(cpu, cpus);
 145         }
 146         if (unlikely(cpus == NULL))
 147                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
 148         else if (!cpumask_empty(cpus))
 149                 smp_call_function_many(cpus, ack_flush, NULL, 1);
 150         else
 151                 called = false;
 152         spin_unlock(&kvm->requests_lock);
 153         free_cpumask_var(cpus);
 154         return called;
 155 }
 156
 157 void kvm_flush_remote_tlbs(struct kvm *kvm)
 158 {
 159         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 160                 ++kvm->stat.remote_tlb_flush;
 161 }
 162
 163 void kvm_reload_remote_mmus(struct kvm *kvm)
 164 {
 165         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 166 }
 167
 168 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 169 {
 170         struct page *page;
 171         int r;
 172
 173         mutex_init(&vcpu->mutex);
 174         vcpu->cpu = -1;
 175         vcpu->kvm = kvm;
 176         vcpu->vcpu_id = id;
 177         init_waitqueue_head(&vcpu->wq);
 178
 179         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 180         if (!page) {
 181                 r = -ENOMEM;
 182                 goto fail;
 183         }
 184         vcpu->run = page_address(page);
 185
 186         r = kvm_arch_vcpu_init(vcpu);
 187         if (r < 0)
 188                 goto fail_free_run;
 189         return 0;
 190
 191 fail_free_run:
 192         free_page((unsigned long)vcpu->run);
 193 fail:
 194         return r;
 195 }
 196 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 197
 198 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 199 {
 200         kvm_arch_vcpu_uninit(vcpu);
 201         free_page((unsigned long)vcpu->run);
 202 }
 203 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 204
 205 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 206 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 207 {
 208         return container_of(mn, struct kvm, mmu_notifier);
 209 }
 210
 211 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 212                                              struct mm_struct *mm,
 213                                              unsigned long address)
 214 {
 215         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 216         int need_tlb_flush;
 217
 218         /*
 219          * When ->invalidate_page runs, the linux pte has been zapped
 220          * already but the page is still allocated until
 221          * ->invalidate_page returns. So if we increase the sequence
 222          * here the kvm page fault will notice if the spte can't be
 223          * established because the page is going to be freed. If
 224          * instead the kvm page fault establishes the spte before
 225          * ->invalidate_page runs, kvm_unmap_hva will release it
 226          * before returning.
 227          *
 228          * The sequence increase only need to be seen at spin_unlock
 229          * time, and not at spin_lock time.
 230          *
 231          * Increasing the sequence after the spin_unlock would be
 232          * unsafe because the kvm page fault could then establish the
 233          * pte after kvm_unmap_hva returned, without noticing the page
 234          * is going to be freed.
 235          */
 236         spin_lock(&kvm->mmu_lock);
 237         kvm->mmu_notifier_seq++;
 238         need_tlb_flush = kvm_unmap_hva(kvm, address);
 239         spin_unlock(&kvm->mmu_lock);
 240
 241         /* we've to flush the tlb before the pages can be freed */
 242         if (need_tlb_flush)
 243                 kvm_flush_remote_tlbs(kvm);
 244
 245 }
 246
 247 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 248                                         struct mm_struct *mm,
 249                                         unsigned long address,
 250                                         pte_t pte)
 251 {
 252         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 253
 254         spin_lock(&kvm->mmu_lock);
 255         kvm->mmu_notifier_seq++;
 256         kvm_set_spte_hva(kvm, address, pte);
 257         spin_unlock(&kvm->mmu_lock);
 258 }
 259
 260 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 261                                                     struct mm_struct *mm,
 262                                                     unsigned long start,
 263                                                     unsigned long end)
 264 {
 265         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 266         int need_tlb_flush = 0;
 267
 268         spin_lock(&kvm->mmu_lock);
 269         /*
 270          * The count increase must become visible at unlock time as no
 271          * spte can be established without taking the mmu_lock and
 272          * count is also read inside the mmu_lock critical section.
 273          */
 274         kvm->mmu_notifier_count++;
 275         for (; start < end; start += PAGE_SIZE)
 276                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 277         spin_unlock(&kvm->mmu_lock);
 278
 279         /* we've to flush the tlb before the pages can be freed */
 280         if (need_tlb_flush)
 281                 kvm_flush_remote_tlbs(kvm);
 282 }
 283
 284 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 285                                                   struct mm_struct *mm,
 286                                                   unsigned long start,
 287                                                   unsigned long end)
 288 {
 289         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 290
 291         spin_lock(&kvm->mmu_lock);
 292         /*
 293          * This sequence increase will notify the kvm page fault that
 294          * the page that is going to be mapped in the spte could have
 295          * been freed.
 296          */
 297         kvm->mmu_notifier_seq++;
 298         /*
 299          * The above sequence increase must be visible before the
 300          * below count decrease but both values are read by the kvm
 301          * page fault under mmu_lock spinlock so we don't need to add
 302          * a smb_wmb() here in between the two.
 303          */
 304         kvm->mmu_notifier_count--;
 305         spin_unlock(&kvm->mmu_lock);
 306
 307         BUG_ON(kvm->mmu_notifier_count < 0);
 308 }
 309
 310 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 311                                               struct mm_struct *mm,
 312                                               unsigned long address)
 313 {
 314         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 315         int young;
 316
 317         spin_lock(&kvm->mmu_lock);
 318         young = kvm_age_hva(kvm, address);
 319         spin_unlock(&kvm->mmu_lock);
 320
 321         if (young)
 322                 kvm_flush_remote_tlbs(kvm);
 323
 324         return young;
 325 }
 326
 327 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 328                                      struct mm_struct *mm)
 329 {
 330         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 331         kvm_arch_flush_shadow(kvm);
 332 }
 333
 334 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 335         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 336         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 337         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 338         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 339         .change_pte             = kvm_mmu_notifier_change_pte,
 340         .release                = kvm_mmu_notifier_release,
 341 };
 342
 343 static int kvm_init_mmu_notifier(struct kvm *kvm)
 344 {
 345         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 346         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 347 }
 348
 349 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
 350
 351 static int kvm_init_mmu_notifier(struct kvm *kvm)
 352 {
 353         return 0;
 354 }
 355
 356 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 357
 358 static struct kvm *kvm_create_vm(void)
 359 {
 360         int r = 0;
 361         struct kvm *kvm = kvm_arch_create_vm();
 362 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 363         struct page *page;
 364 #endif
 365
 366         if (IS_ERR(kvm))
 367                 goto out;
 368
 369         r = hardware_enable_all();
 370         if (r)
 371                 goto out_err_nodisable;
 372
 373 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 374         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 375         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 376 #endif
 377
 378         r = -ENOMEM;
 379         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 380         if (!kvm->memslots)
 381                 goto out_err;
 382
 383 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 384         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 385         if (!page)
 386                 goto out_err;
 387
 388         kvm->coalesced_mmio_ring =
 389                         (struct kvm_coalesced_mmio_ring *)page_address(page);
 390 #endif
 391
 392         r = kvm_init_mmu_notifier(kvm);
 393         if (r) {
 394 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 395                 put_page(page);
 396 #endif
 397                 goto out_err;
 398         }
 399
 400         kvm->mm = current->mm;
 401         atomic_inc(&kvm->mm->mm_count);
 402         spin_lock_init(&kvm->mmu_lock);
 403         spin_lock_init(&kvm->requests_lock);
 404         kvm_io_bus_init(&kvm->pio_bus);
 405         kvm_eventfd_init(kvm);
 406         mutex_init(&kvm->lock);
 407         mutex_init(&kvm->irq_lock);
 408         kvm_io_bus_init(&kvm->mmio_bus);
 409         init_rwsem(&kvm->slots_lock);
 410         atomic_set(&kvm->users_count, 1);
 411         spin_lock(&kvm_lock);
 412         list_add(&kvm->vm_list, &vm_list);
 413         spin_unlock(&kvm_lock);
 414 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 415         kvm_coalesced_mmio_init(kvm);
 416 #endif
 417 out:
 418         return kvm;
 419
 420 out_err:
 421         hardware_disable_all();
 422 out_err_nodisable:
 423         kfree(kvm->memslots);
 424         kfree(kvm);
 425         return ERR_PTR(r);
 426 }
 427
 428 /*
 429  * Free any memory in @free but not in @dont.
 430  */
 431 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 432                                   struct kvm_memory_slot *dont)
 433 {
 434         int i;
 435
 436         if (!dont || free->rmap != dont->rmap)
 437                 vfree(free->rmap);
 438
 439         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 440                 vfree(free->dirty_bitmap);
 441
 442
 443         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 444                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
 445                         vfree(free->lpage_info[i]);
 446                         free->lpage_info[i] = NULL;
 447                 }
 448         }
 449
 450         free->npages = 0;
 451         free->dirty_bitmap = NULL;
 452         free->rmap = NULL;
 453 }
 454
 455 void kvm_free_physmem(struct kvm *kvm)
 456 {
 457         int i;
 458         struct kvm_memslots *slots = kvm->memslots;
 459
 460         for (i = 0; i < slots->nmemslots; ++i)
 461                 kvm_free_physmem_slot(&slots->memslots[i], NULL);
 462
 463         kfree(kvm->memslots);
 464 }
 465
 466 static void kvm_destroy_vm(struct kvm *kvm)
 467 {
 468         struct mm_struct *mm = kvm->mm;
 469
 470         kvm_arch_sync_events(kvm);
 471         spin_lock(&kvm_lock);
 472         list_del(&kvm->vm_list);
 473         spin_unlock(&kvm_lock);
 474         kvm_free_irq_routing(kvm);
 475         kvm_io_bus_destroy(&kvm->pio_bus);
 476         kvm_io_bus_destroy(&kvm->mmio_bus);
 477         kvm_coalesced_mmio_free(kvm);
 478 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 479         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 480 #else
 481         kvm_arch_flush_shadow(kvm);
 482 #endif
 483         kvm_arch_destroy_vm(kvm);
 484         hardware_disable_all();
 485         mmdrop(mm);
 486 }
 487
 488 void kvm_get_kvm(struct kvm *kvm)
 489 {
 490         atomic_inc(&kvm->users_count);
 491 }
 492 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 493
 494 void kvm_put_kvm(struct kvm *kvm)
 495 {
 496         if (atomic_dec_and_test(&kvm->users_count))
 497                 kvm_destroy_vm(kvm);
 498 }
 499 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 500
 501
 502 static int kvm_vm_release(struct inode *inode, struct file *filp)
 503 {
 504         struct kvm *kvm = filp->private_data;
 505
 506         kvm_irqfd_release(kvm);
 507
 508         kvm_put_kvm(kvm);
 509         return 0;
 510 }
 511
 512 /*
 513  * Allocate some memory and give it an address in the guest physical address
 514  * space.
 515  *
 516  * Discontiguous memory is allowed, mostly for framebuffers.
 517  *
 518  * Must be called holding mmap_sem for write.
 519  */
 520 int __kvm_set_memory_region(struct kvm *kvm,
 521                             struct kvm_userspace_memory_region *mem,
 522                             int user_alloc)
 523 {
 524         int r;
 525         gfn_t base_gfn;
 526         unsigned long npages;
 527         unsigned long i;
 528         struct kvm_memory_slot *memslot;
 529         struct kvm_memory_slot old, new;
 530
 531         r = -EINVAL;
 532         /* General sanity checks */
 533         if (mem->memory_size & (PAGE_SIZE - 1))
 534                 goto out;
 535         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 536                 goto out;
 537         if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
 538                 goto out;
 539         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 540                 goto out;
 541         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 542                 goto out;
 543
 544         memslot = &kvm->memslots->memslots[mem->slot];
 545         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 546         npages = mem->memory_size >> PAGE_SHIFT;
 547
 548         if (!npages)
 549                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 550
 551         new = old = *memslot;
 552
 553         new.base_gfn = base_gfn;
 554         new.npages = npages;
 555         new.flags = mem->flags;
 556
 557         /* Disallow changing a memory slot's size. */
 558         r = -EINVAL;
 559         if (npages && old.npages && npages != old.npages)
 560                 goto out_free;
 561
 562         /* Check for overlaps */
 563         r = -EEXIST;
 564         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 565                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
 566
 567                 if (s == memslot || !s->npages)
 568                         continue;
 569                 if (!((base_gfn + npages <= s->base_gfn) ||
 570                       (base_gfn >= s->base_gfn + s->npages)))
 571                         goto out_free;
 572         }
 573
 574         /* Free page dirty bitmap if unneeded */
 575         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 576                 new.dirty_bitmap = NULL;
 577
 578         r = -ENOMEM;
 579
 580         /* Allocate if a slot is being created */
 581 #ifndef CONFIG_S390
 582         if (npages && !new.rmap) {
 583                 new.rmap = vmalloc(npages * sizeof(struct page *));
 584
 585                 if (!new.rmap)
 586                         goto out_free;
 587
 588                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 589
 590                 new.user_alloc = user_alloc;
 591                 /*
 592                  * hva_to_rmmap() serialzies with the mmu_lock and to be
 593                  * safe it has to ignore memslots with !user_alloc &&
 594                  * !userspace_addr.
 595                  */
 596                 if (user_alloc)
 597                         new.userspace_addr = mem->userspace_addr;
 598                 else
 599                         new.userspace_addr = 0;
 600         }
 601         if (!npages)
 602                 goto skip_lpage;
 603
 604         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 605                 unsigned long ugfn;
 606                 unsigned long j;
 607                 int lpages;
 608                 int level = i + 2;
 609
 610                 /* Avoid unused variable warning if no large pages */
 611                 (void)level;
 612
 613                 if (new.lpage_info[i])
 614                         continue;
 615
 616                 lpages = 1 + (base_gfn + npages - 1) /
 617                              KVM_PAGES_PER_HPAGE(level);
 618                 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
 619
 620                 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
 621
 622                 if (!new.lpage_info[i])
 623                         goto out_free;
 624
 625                 memset(new.lpage_info[i], 0,
 626                        lpages * sizeof(*new.lpage_info[i]));
 627
 628                 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
 629                         new.lpage_info[i][0].write_count = 1;
 630                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
 631                         new.lpage_info[i][lpages - 1].write_count = 1;
 632                 ugfn = new.userspace_addr >> PAGE_SHIFT;
 633                 /*
 634                  * If the gfn and userspace address are not aligned wrt each
 635                  * other, or if explicitly asked to, disable large page
 636                  * support for this slot
 637                  */
 638                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
 639                     !largepages_enabled)
 640                         for (j = 0; j < lpages; ++j)
 641                                 new.lpage_info[i][j].write_count = 1;
 642         }
 643
 644 skip_lpage:
 645
 646         /* Allocate page dirty bitmap if needed */
 647         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 648                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 649
 650                 new.dirty_bitmap = vmalloc(dirty_bytes);
 651                 if (!new.dirty_bitmap)
 652                         goto out_free;
 653                 memset(new.dirty_bitmap, 0, dirty_bytes);
 654                 if (old.npages)
 655                         kvm_arch_flush_shadow(kvm);
 656         }
 657 #else  /* not defined CONFIG_S390 */
 658         new.user_alloc = user_alloc;
 659         if (user_alloc)
 660                 new.userspace_addr = mem->userspace_addr;
 661 #endif /* not defined CONFIG_S390 */
 662
 663         if (!npages)
 664                 kvm_arch_flush_shadow(kvm);
 665
 666         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
 667         if (r)
 668                 goto out_free;
 669
 670         spin_lock(&kvm->mmu_lock);
 671         if (mem->slot >= kvm->memslots->nmemslots)
 672                 kvm->memslots->nmemslots = mem->slot + 1;
 673
 674         *memslot = new;
 675         spin_unlock(&kvm->mmu_lock);
 676
 677         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
 678
 679         kvm_free_physmem_slot(&old, npages ? &new : NULL);
 680         /* Slot deletion case: we have to update the current slot */
 681         spin_lock(&kvm->mmu_lock);
 682         if (!npages)
 683                 *memslot = old;
 684         spin_unlock(&kvm->mmu_lock);
 685 #ifdef CONFIG_DMAR
 686         /* map the pages in iommu page table */
 687         r = kvm_iommu_map_pages(kvm, base_gfn, npages);
 688         if (r)
 689                 goto out;
 690 #endif
 691         return 0;
 692
 693 out_free:
 694         kvm_free_physmem_slot(&new, &old);
 695 out:
 696         return r;
 697
 698 }
 699 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 700
 701 int kvm_set_memory_region(struct kvm *kvm,
 702                           struct kvm_userspace_memory_region *mem,
 703                           int user_alloc)
 704 {
 705         int r;
 706
 707         down_write(&kvm->slots_lock);
 708         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 709         up_write(&kvm->slots_lock);
 710         return r;
 711 }
 712 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 713
 714 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 715                                    struct
 716                                    kvm_userspace_memory_region *mem,
 717                                    int user_alloc)
 718 {
 719         if (mem->slot >= KVM_MEMORY_SLOTS)
 720                 return -EINVAL;
 721         return kvm_set_memory_region(kvm, mem, user_alloc);
 722 }
 723
 724 int kvm_get_dirty_log(struct kvm *kvm,
 725                         struct kvm_dirty_log *log, int *is_dirty)
 726 {
 727         struct kvm_memory_slot *memslot;
 728         int r, i;
 729         int n;
 730         unsigned long any = 0;
 731
 732         r = -EINVAL;
 733         if (log->slot >= KVM_MEMORY_SLOTS)
 734                 goto out;
 735
 736         memslot = &kvm->memslots->memslots[log->slot];
 737         r = -ENOENT;
 738         if (!memslot->dirty_bitmap)
 739                 goto out;
 740
 741         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 742
 743         for (i = 0; !any && i < n/sizeof(long); ++i)
 744                 any = memslot->dirty_bitmap[i];
 745
 746         r = -EFAULT;
 747         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 748                 goto out;
 749
 750         if (any)
 751                 *is_dirty = 1;
 752
 753         r = 0;
 754 out:
 755         return r;
 756 }
 757
 758 void kvm_disable_largepages(void)
 759 {
 760         largepages_enabled = false;
 761 }
 762 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 763
 764 int is_error_page(struct page *page)
 765 {
 766         return page == bad_page;
 767 }
 768 EXPORT_SYMBOL_GPL(is_error_page);
 769
 770 int is_error_pfn(pfn_t pfn)
 771 {
 772         return pfn == bad_pfn;
 773 }
 774 EXPORT_SYMBOL_GPL(is_error_pfn);
 775
 776 static inline unsigned long bad_hva(void)
 777 {
 778         return PAGE_OFFSET;
 779 }
 780
 781 int kvm_is_error_hva(unsigned long addr)
 782 {
 783         return addr == bad_hva();
 784 }
 785 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 786
 787 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
 788 {
 789         int i;
 790         struct kvm_memslots *slots = kvm->memslots;
 791
 792         for (i = 0; i < slots->nmemslots; ++i) {
 793                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 794
 795                 if (gfn >= memslot->base_gfn
 796                     && gfn < memslot->base_gfn + memslot->npages)
 797                         return memslot;
 798         }
 799         return NULL;
 800 }
 801 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
 802
 803 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 804 {
 805         gfn = unalias_gfn(kvm, gfn);
 806         return gfn_to_memslot_unaliased(kvm, gfn);
 807 }
 808
 809 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 810 {
 811         int i;
 812         struct kvm_memslots *slots = kvm->memslots;
 813
 814         gfn = unalias_gfn(kvm, gfn);
 815         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 816                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 817
 818                 if (gfn >= memslot->base_gfn
 819                     && gfn < memslot->base_gfn + memslot->npages)
 820                         return 1;
 821         }
 822         return 0;
 823 }
 824 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 825
 826 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 827 {
 828         struct kvm_memory_slot *slot;
 829
 830         gfn = unalias_gfn(kvm, gfn);
 831         slot = gfn_to_memslot_unaliased(kvm, gfn);
 832         if (!slot)
 833                 return bad_hva();
 834         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 835 }
 836 EXPORT_SYMBOL_GPL(gfn_to_hva);
 837
 838 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
 839 {
 840         struct page *page[1];
 841         int npages;
 842         pfn_t pfn;
 843
 844         might_sleep();
 845
 846         npages = get_user_pages_fast(addr, 1, 1, page);
 847
 848         if (unlikely(npages != 1)) {
 849                 struct vm_area_struct *vma;
 850
 851                 down_read(&current->mm->mmap_sem);
 852                 vma = find_vma(current->mm, addr);
 853
 854                 if (vma == NULL || addr < vma->vm_start ||
 855                     !(vma->vm_flags & VM_PFNMAP)) {
 856                         up_read(&current->mm->mmap_sem);
 857                         get_page(bad_page);
 858                         return page_to_pfn(bad_page);
 859                 }
 860
 861                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 862                 up_read(&current->mm->mmap_sem);
 863                 BUG_ON(!kvm_is_mmio_pfn(pfn));
 864         } else
 865                 pfn = page_to_pfn(page[0]);
 866
 867         return pfn;
 868 }
 869
 870 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
 871 {
 872         unsigned long addr;
 873
 874         addr = gfn_to_hva(kvm, gfn);
 875         if (kvm_is_error_hva(addr)) {
 876                 get_page(bad_page);
 877                 return page_to_pfn(bad_page);
 878         }
 879
 880         return hva_to_pfn(kvm, addr);
 881 }
 882 EXPORT_SYMBOL_GPL(gfn_to_pfn);
 883
 884 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 885 {
 886         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 887 }
 888
 889 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 890                          struct kvm_memory_slot *slot, gfn_t gfn)
 891 {
 892         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
 893         return hva_to_pfn(kvm, addr);
 894 }
 895
 896 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 897 {
 898         pfn_t pfn;
 899
 900         pfn = gfn_to_pfn(kvm, gfn);
 901         if (!kvm_is_mmio_pfn(pfn))
 902                 return pfn_to_page(pfn);
 903
 904         WARN_ON(kvm_is_mmio_pfn(pfn));
 905
 906         get_page(bad_page);
 907         return bad_page;
 908 }
 909
 910 EXPORT_SYMBOL_GPL(gfn_to_page);
 911
 912 void kvm_release_page_clean(struct page *page)
 913 {
 914         kvm_release_pfn_clean(page_to_pfn(page));
 915 }
 916 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
 917
 918 void kvm_release_pfn_clean(pfn_t pfn)
 919 {
 920         if (!kvm_is_mmio_pfn(pfn))
 921                 put_page(pfn_to_page(pfn));
 922 }
 923 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
 924
 925 void kvm_release_page_dirty(struct page *page)
 926 {
 927         kvm_release_pfn_dirty(page_to_pfn(page));
 928 }
 929 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
 930
 931 void kvm_release_pfn_dirty(pfn_t pfn)
 932 {
 933         kvm_set_pfn_dirty(pfn);
 934         kvm_release_pfn_clean(pfn);
 935 }
 936 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
 937
 938 void kvm_set_page_dirty(struct page *page)
 939 {
 940         kvm_set_pfn_dirty(page_to_pfn(page));
 941 }
 942 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
 943
 944 void kvm_set_pfn_dirty(pfn_t pfn)
 945 {
 946         if (!kvm_is_mmio_pfn(pfn)) {
 947                 struct page *page = pfn_to_page(pfn);
 948                 if (!PageReserved(page))
 949                         SetPageDirty(page);
 950         }
 951 }
 952 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
 953
 954 void kvm_set_pfn_accessed(pfn_t pfn)
 955 {
 956         if (!kvm_is_mmio_pfn(pfn))
 957                 mark_page_accessed(pfn_to_page(pfn));
 958 }
 959 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
 960
 961 void kvm_get_pfn(pfn_t pfn)
 962 {
 963         if (!kvm_is_mmio_pfn(pfn))
 964                 get_page(pfn_to_page(pfn));
 965 }
 966 EXPORT_SYMBOL_GPL(kvm_get_pfn);
 967
 968 static int next_segment(unsigned long len, int offset)
 969 {
 970         if (len > PAGE_SIZE - offset)
 971                 return PAGE_SIZE - offset;
 972         else
 973                 return len;
 974 }
 975
 976 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 977                         int len)
 978 {
 979         int r;
 980         unsigned long addr;
 981
 982         addr = gfn_to_hva(kvm, gfn);
 983         if (kvm_is_error_hva(addr))
 984                 return -EFAULT;
 985         r = copy_from_user(data, (void __user *)addr + offset, len);
 986         if (r)
 987                 return -EFAULT;
 988         return 0;
 989 }
 990 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
 991
 992 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
 993 {
 994         gfn_t gfn = gpa >> PAGE_SHIFT;
 995         int seg;
 996         int offset = offset_in_page(gpa);
 997         int ret;
 998
 999         while ((seg = next_segment(len, offset)) != 0) {
1000                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1001                 if (ret < 0)
1002                         return ret;
1003                 offset = 0;
1004                 len -= seg;
1005                 data += seg;
1006                 ++gfn;
1007         }
1008         return 0;
1009 }
1010 EXPORT_SYMBOL_GPL(kvm_read_guest);
1011
1012 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1013                           unsigned long len)
1014 {
1015         int r;
1016         unsigned long addr;
1017         gfn_t gfn = gpa >> PAGE_SHIFT;
1018         int offset = offset_in_page(gpa);
1019
1020         addr = gfn_to_hva(kvm, gfn);
1021         if (kvm_is_error_hva(addr))
1022                 return -EFAULT;
1023         pagefault_disable();
1024         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1025         pagefault_enable();
1026         if (r)
1027                 return -EFAULT;
1028         return 0;
1029 }
1030 EXPORT_SYMBOL(kvm_read_guest_atomic);
1031
1032 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1033                          int offset, int len)
1034 {
1035         int r;
1036         unsigned long addr;
1037
1038         addr = gfn_to_hva(kvm, gfn);
1039         if (kvm_is_error_hva(addr))
1040                 return -EFAULT;
1041         r = copy_to_user((void __user *)addr + offset, data, len);
1042         if (r)
1043                 return -EFAULT;
1044         mark_page_dirty(kvm, gfn);
1045         return 0;
1046 }
1047 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1048
1049 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1050                     unsigned long len)
1051 {
1052         gfn_t gfn = gpa >> PAGE_SHIFT;
1053         int seg;
1054         int offset = offset_in_page(gpa);
1055         int ret;
1056
1057         while ((seg = next_segment(len, offset)) != 0) {
1058                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1059                 if (ret < 0)
1060                         return ret;
1061                 offset = 0;
1062                 len -= seg;
1063                 data += seg;
1064                 ++gfn;
1065         }
1066         return 0;
1067 }
1068
1069 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1070 {
1071         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1072 }
1073 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1074
1075 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1076 {
1077         gfn_t gfn = gpa >> PAGE_SHIFT;
1078         int seg;
1079         int offset = offset_in_page(gpa);
1080         int ret;
1081
1082         while ((seg = next_segment(len, offset)) != 0) {
1083                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1084                 if (ret < 0)
1085                         return ret;
1086                 offset = 0;
1087                 len -= seg;
1088                 ++gfn;
1089         }
1090         return 0;
1091 }
1092 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1093
1094 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1095 {
1096         struct kvm_memory_slot *memslot;
1097
1098         gfn = unalias_gfn(kvm, gfn);
1099         memslot = gfn_to_memslot_unaliased(kvm, gfn);
1100         if (memslot && memslot->dirty_bitmap) {
1101                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1102
1103                 /* avoid RMW */
1104                 if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap))
1105                         generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1106         }
1107 }
1108
1109 /*
1110  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1111  */
1112 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1113 {
1114         DEFINE_WAIT(wait);
1115
1116         for (;;) {
1117                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1118
1119                 if (kvm_arch_vcpu_runnable(vcpu)) {
1120                         set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1121                         break;
1122                 }
1123                 if (kvm_cpu_has_pending_timer(vcpu))
1124                         break;
1125                 if (signal_pending(current))
1126                         break;
1127
1128                 schedule();
1129         }
1130
1131         finish_wait(&vcpu->wq, &wait);
1132 }
1133
1134 void kvm_resched(struct kvm_vcpu *vcpu)
1135 {
1136         if (!need_resched())
1137                 return;
1138         cond_resched();
1139 }
1140 EXPORT_SYMBOL_GPL(kvm_resched);
1141
1142 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1143 {
1144         ktime_t expires;
1145         DEFINE_WAIT(wait);
1146
1147         prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1148
1149         /* Sleep for 100 us, and hope lock-holder got scheduled */
1150         expires = ktime_add_ns(ktime_get(), 100000UL);
1151         schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1152
1153         finish_wait(&vcpu->wq, &wait);
1154 }
1155 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1156
1157 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1158 {
1159         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1160         struct page *page;
1161
1162         if (vmf->pgoff == 0)
1163                 page = virt_to_page(vcpu->run);
1164 #ifdef CONFIG_X86
1165         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1166                 page = virt_to_page(vcpu->arch.pio_data);
1167 #endif
1168 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1169         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1170                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1171 #endif
1172         else
1173                 return VM_FAULT_SIGBUS;
1174         get_page(page);
1175         vmf->page = page;
1176         return 0;
1177 }
1178
1179 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1180         .fault = kvm_vcpu_fault,
1181 };
1182
1183 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1184 {
1185         vma->vm_ops = &kvm_vcpu_vm_ops;
1186         return 0;
1187 }
1188
1189 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1190 {
1191         struct kvm_vcpu *vcpu = filp->private_data;
1192
1193         kvm_put_kvm(vcpu->kvm);
1194         return 0;
1195 }
1196
1197 static struct file_operations kvm_vcpu_fops = {
1198         .release        = kvm_vcpu_release,
1199         .unlocked_ioctl = kvm_vcpu_ioctl,
1200         .compat_ioctl   = kvm_vcpu_ioctl,
1201         .mmap           = kvm_vcpu_mmap,
1202 };
1203
1204 /*
1205  * Allocates an inode for the vcpu.
1206  */
1207 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1208 {
1209         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1210 }
1211
1212 /*
1213  * Creates some virtual cpus.  Good luck creating more than one.
1214  */
1215 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1216 {
1217         int r;
1218         struct kvm_vcpu *vcpu, *v;
1219
1220         vcpu = kvm_arch_vcpu_create(kvm, id);
1221         if (IS_ERR(vcpu))
1222                 return PTR_ERR(vcpu);
1223
1224         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1225
1226         r = kvm_arch_vcpu_setup(vcpu);
1227         if (r)
1228                 return r;
1229
1230         mutex_lock(&kvm->lock);
1231         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1232                 r = -EINVAL;
1233                 goto vcpu_destroy;
1234         }
1235
1236         kvm_for_each_vcpu(r, v, kvm)
1237                 if (v->vcpu_id == id) {
1238                         r = -EEXIST;
1239                         goto vcpu_destroy;
1240                 }
1241
1242         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1243
1244         /* Now it's all set up, let userspace reach it */
1245         kvm_get_kvm(kvm);
1246         r = create_vcpu_fd(vcpu);
1247         if (r < 0) {
1248                 kvm_put_kvm(kvm);
1249                 goto vcpu_destroy;
1250         }
1251
1252         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1253         smp_wmb();
1254         atomic_inc(&kvm->online_vcpus);
1255
1256 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1257         if (kvm->bsp_vcpu_id == id)
1258                 kvm->bsp_vcpu = vcpu;
1259 #endif
1260         mutex_unlock(&kvm->lock);
1261         return r;
1262
1263 vcpu_destroy:
1264         mutex_unlock(&kvm->lock);
1265         kvm_arch_vcpu_destroy(vcpu);
1266         return r;
1267 }
1268
1269 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1270 {
1271         if (sigset) {
1272                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1273                 vcpu->sigset_active = 1;
1274                 vcpu->sigset = *sigset;
1275         } else
1276                 vcpu->sigset_active = 0;
1277         return 0;
1278 }
1279
1280 static long kvm_vcpu_ioctl(struct file *filp,
1281                            unsigned int ioctl, unsigned long arg)
1282 {
1283         struct kvm_vcpu *vcpu = filp->private_data;
1284         void __user *argp = (void __user *)arg;
1285         int r;
1286         struct kvm_fpu *fpu = NULL;
1287         struct kvm_sregs *kvm_sregs = NULL;
1288
1289         if (vcpu->kvm->mm != current->mm)
1290                 return -EIO;
1291         switch (ioctl) {
1292         case KVM_RUN:
1293                 r = -EINVAL;
1294                 if (arg)
1295                         goto out;
1296                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1297                 break;
1298         case KVM_GET_REGS: {
1299                 struct kvm_regs *kvm_regs;
1300
1301                 r = -ENOMEM;
1302                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1303                 if (!kvm_regs)
1304                         goto out;
1305                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1306                 if (r)
1307                         goto out_free1;
1308                 r = -EFAULT;
1309                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1310                         goto out_free1;
1311                 r = 0;
1312 out_free1:
1313                 kfree(kvm_regs);
1314                 break;
1315         }
1316         case KVM_SET_REGS: {
1317                 struct kvm_regs *kvm_regs;
1318
1319                 r = -ENOMEM;
1320                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1321                 if (!kvm_regs)
1322                         goto out;
1323                 r = -EFAULT;
1324                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1325                         goto out_free2;
1326                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1327                 if (r)
1328                         goto out_free2;
1329                 r = 0;
1330 out_free2:
1331                 kfree(kvm_regs);
1332                 break;
1333         }
1334         case KVM_GET_SREGS: {
1335                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1336                 r = -ENOMEM;
1337                 if (!kvm_sregs)
1338                         goto out;
1339                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1340                 if (r)
1341                         goto out;
1342                 r = -EFAULT;
1343                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1344                         goto out;
1345                 r = 0;
1346                 break;
1347         }
1348         case KVM_SET_SREGS: {
1349                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1350                 r = -ENOMEM;
1351                 if (!kvm_sregs)
1352                         goto out;
1353                 r = -EFAULT;
1354                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1355                         goto out;
1356                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1357                 if (r)
1358                         goto out;
1359                 r = 0;
1360                 break;
1361         }
1362         case KVM_GET_MP_STATE: {
1363                 struct kvm_mp_state mp_state;
1364
1365                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1366                 if (r)
1367                         goto out;
1368                 r = -EFAULT;
1369                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1370                         goto out;
1371                 r = 0;
1372                 break;
1373         }
1374         case KVM_SET_MP_STATE: {
1375                 struct kvm_mp_state mp_state;
1376
1377                 r = -EFAULT;
1378                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1379                         goto out;
1380                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1381                 if (r)
1382                         goto out;
1383                 r = 0;
1384                 break;
1385         }
1386         case KVM_TRANSLATE: {
1387                 struct kvm_translation tr;
1388
1389                 r = -EFAULT;
1390                 if (copy_from_user(&tr, argp, sizeof tr))
1391                         goto out;
1392                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1393                 if (r)
1394                         goto out;
1395                 r = -EFAULT;
1396                 if (copy_to_user(argp, &tr, sizeof tr))
1397                         goto out;
1398                 r = 0;
1399                 break;
1400         }
1401         case KVM_SET_GUEST_DEBUG: {
1402                 struct kvm_guest_debug dbg;
1403
1404                 r = -EFAULT;
1405                 if (copy_from_user(&dbg, argp, sizeof dbg))
1406                         goto out;
1407                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1408                 if (r)
1409                         goto out;
1410                 r = 0;
1411                 break;
1412         }
1413         case KVM_SET_SIGNAL_MASK: {
1414                 struct kvm_signal_mask __user *sigmask_arg = argp;
1415                 struct kvm_signal_mask kvm_sigmask;
1416                 sigset_t sigset, *p;
1417
1418                 p = NULL;
1419                 if (argp) {
1420                         r = -EFAULT;
1421                         if (copy_from_user(&kvm_sigmask, argp,
1422                                            sizeof kvm_sigmask))
1423                                 goto out;
1424                         r = -EINVAL;
1425                         if (kvm_sigmask.len != sizeof sigset)
1426                                 goto out;
1427                         r = -EFAULT;
1428                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1429                                            sizeof sigset))
1430                                 goto out;
1431                         p = &sigset;
1432                 }
1433                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1434                 break;
1435         }
1436         case KVM_GET_FPU: {
1437                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1438                 r = -ENOMEM;
1439                 if (!fpu)
1440                         goto out;
1441                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1442                 if (r)
1443                         goto out;
1444                 r = -EFAULT;
1445                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1446                         goto out;
1447                 r = 0;
1448                 break;
1449         }
1450         case KVM_SET_FPU: {
1451                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1452                 r = -ENOMEM;
1453                 if (!fpu)
1454                         goto out;
1455                 r = -EFAULT;
1456                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1457                         goto out;
1458                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1459                 if (r)
1460                         goto out;
1461                 r = 0;
1462                 break;
1463         }
1464         default:
1465                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1466         }
1467 out:
1468         kfree(fpu);
1469         kfree(kvm_sregs);
1470         return r;
1471 }
1472
1473 static long kvm_vm_ioctl(struct file *filp,
1474                            unsigned int ioctl, unsigned long arg)
1475 {
1476         struct kvm *kvm = filp->private_data;
1477         void __user *argp = (void __user *)arg;
1478         int r;
1479
1480         if (kvm->mm != current->mm)
1481                 return -EIO;
1482         switch (ioctl) {
1483         case KVM_CREATE_VCPU:
1484                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1485                 if (r < 0)
1486                         goto out;
1487                 break;
1488         case KVM_SET_USER_MEMORY_REGION: {
1489                 struct kvm_userspace_memory_region kvm_userspace_mem;
1490
1491                 r = -EFAULT;
1492                 if (copy_from_user(&kvm_userspace_mem, argp,
1493                                                 sizeof kvm_userspace_mem))
1494                         goto out;
1495
1496                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1497                 if (r)
1498                         goto out;
1499                 break;
1500         }
1501         case KVM_GET_DIRTY_LOG: {
1502                 struct kvm_dirty_log log;
1503
1504                 r = -EFAULT;
1505                 if (copy_from_user(&log, argp, sizeof log))
1506                         goto out;
1507                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1508                 if (r)
1509                         goto out;
1510                 break;
1511         }
1512 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1513         case KVM_REGISTER_COALESCED_MMIO: {
1514                 struct kvm_coalesced_mmio_zone zone;
1515                 r = -EFAULT;
1516                 if (copy_from_user(&zone, argp, sizeof zone))
1517                         goto out;
1518                 r = -ENXIO;
1519                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1520                 if (r)
1521                         goto out;
1522                 r = 0;
1523                 break;
1524         }
1525         case KVM_UNREGISTER_COALESCED_MMIO: {
1526                 struct kvm_coalesced_mmio_zone zone;
1527                 r = -EFAULT;
1528                 if (copy_from_user(&zone, argp, sizeof zone))
1529                         goto out;
1530                 r = -ENXIO;
1531                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1532                 if (r)
1533                         goto out;
1534                 r = 0;
1535                 break;
1536         }
1537 #endif
1538         case KVM_IRQFD: {
1539                 struct kvm_irqfd data;
1540
1541                 r = -EFAULT;
1542                 if (copy_from_user(&data, argp, sizeof data))
1543                         goto out;
1544                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1545                 break;
1546         }
1547         case KVM_IOEVENTFD: {
1548                 struct kvm_ioeventfd data;
1549
1550                 r = -EFAULT;
1551                 if (copy_from_user(&data, argp, sizeof data))
1552                         goto out;
1553                 r = kvm_ioeventfd(kvm, &data);
1554                 break;
1555         }
1556 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1557         case KVM_SET_BOOT_CPU_ID:
1558                 r = 0;
1559                 mutex_lock(&kvm->lock);
1560                 if (atomic_read(&kvm->online_vcpus) != 0)
1561                         r = -EBUSY;
1562                 else
1563                         kvm->bsp_vcpu_id = arg;
1564                 mutex_unlock(&kvm->lock);
1565                 break;
1566 #endif
1567         default:
1568                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1569                 if (r == -ENOTTY)
1570                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1571         }
1572 out:
1573         return r;
1574 }
1575
1576 #ifdef CONFIG_COMPAT
1577 struct compat_kvm_dirty_log {
1578         __u32 slot;
1579         __u32 padding1;
1580         union {
1581                 compat_uptr_t dirty_bitmap; /* one bit per page */
1582                 __u64 padding2;
1583         };
1584 };
1585
1586 static long kvm_vm_compat_ioctl(struct file *filp,
1587                            unsigned int ioctl, unsigned long arg)
1588 {
1589         struct kvm *kvm = filp->private_data;
1590         int r;
1591
1592         if (kvm->mm != current->mm)
1593                 return -EIO;
1594         switch (ioctl) {
1595         case KVM_GET_DIRTY_LOG: {
1596                 struct compat_kvm_dirty_log compat_log;
1597                 struct kvm_dirty_log log;
1598
1599                 r = -EFAULT;
1600                 if (copy_from_user(&compat_log, (void __user *)arg,
1601                                    sizeof(compat_log)))
1602                         goto out;
1603                 log.slot         = compat_log.slot;
1604                 log.padding1     = compat_log.padding1;
1605                 log.padding2     = compat_log.padding2;
1606                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1607
1608                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1609                 if (r)
1610                         goto out;
1611                 break;
1612         }
1613         default:
1614                 r = kvm_vm_ioctl(filp, ioctl, arg);
1615         }
1616
1617 out:
1618         return r;
1619 }
1620 #endif
1621
1622 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1623 {
1624         struct page *page[1];
1625         unsigned long addr;
1626         int npages;
1627         gfn_t gfn = vmf->pgoff;
1628         struct kvm *kvm = vma->vm_file->private_data;
1629
1630         addr = gfn_to_hva(kvm, gfn);
1631         if (kvm_is_error_hva(addr))
1632                 return VM_FAULT_SIGBUS;
1633
1634         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1635                                 NULL);
1636         if (unlikely(npages != 1))
1637                 return VM_FAULT_SIGBUS;
1638
1639         vmf->page = page[0];
1640         return 0;
1641 }
1642
1643 static const struct vm_operations_struct kvm_vm_vm_ops = {
1644         .fault = kvm_vm_fault,
1645 };
1646
1647 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1648 {
1649         vma->vm_ops = &kvm_vm_vm_ops;
1650         return 0;
1651 }
1652
1653 static struct file_operations kvm_vm_fops = {
1654         .release        = kvm_vm_release,
1655         .unlocked_ioctl = kvm_vm_ioctl,
1656 #ifdef CONFIG_COMPAT
1657         .compat_ioctl   = kvm_vm_compat_ioctl,
1658 #endif
1659         .mmap           = kvm_vm_mmap,
1660 };
1661
1662 static int kvm_dev_ioctl_create_vm(void)
1663 {
1664         int fd;
1665         struct kvm *kvm;
1666
1667         kvm = kvm_create_vm();
1668         if (IS_ERR(kvm))
1669                 return PTR_ERR(kvm);
1670         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1671         if (fd < 0)
1672                 kvm_put_kvm(kvm);
1673
1674         return fd;
1675 }
1676
1677 static long kvm_dev_ioctl_check_extension_generic(long arg)
1678 {
1679         switch (arg) {
1680         case KVM_CAP_USER_MEMORY:
1681         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1682         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1683 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1684         case KVM_CAP_SET_BOOT_CPU_ID:
1685 #endif
1686         case KVM_CAP_INTERNAL_ERROR_DATA:
1687                 return 1;
1688 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1689         case KVM_CAP_IRQ_ROUTING:
1690                 return KVM_MAX_IRQ_ROUTES;
1691 #endif
1692         default:
1693                 break;
1694         }
1695         return kvm_dev_ioctl_check_extension(arg);
1696 }
1697
1698 static long kvm_dev_ioctl(struct file *filp,
1699                           unsigned int ioctl, unsigned long arg)
1700 {
1701         long r = -EINVAL;
1702
1703         switch (ioctl) {
1704         case KVM_GET_API_VERSION:
1705                 r = -EINVAL;
1706                 if (arg)
1707                         goto out;
1708                 r = KVM_API_VERSION;
1709                 break;
1710         case KVM_CREATE_VM:
1711                 r = -EINVAL;
1712                 if (arg)
1713                         goto out;
1714                 r = kvm_dev_ioctl_create_vm();
1715                 break;
1716         case KVM_CHECK_EXTENSION:
1717                 r = kvm_dev_ioctl_check_extension_generic(arg);
1718                 break;
1719         case KVM_GET_VCPU_MMAP_SIZE:
1720                 r = -EINVAL;
1721                 if (arg)
1722                         goto out;
1723                 r = PAGE_SIZE;     /* struct kvm_run */
1724 #ifdef CONFIG_X86
1725                 r += PAGE_SIZE;    /* pio data page */
1726 #endif
1727 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1728                 r += PAGE_SIZE;    /* coalesced mmio ring page */
1729 #endif
1730                 break;
1731         case KVM_TRACE_ENABLE:
1732         case KVM_TRACE_PAUSE:
1733         case KVM_TRACE_DISABLE:
1734                 r = -EOPNOTSUPP;
1735                 break;
1736         default:
1737                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1738         }
1739 out:
1740         return r;
1741 }
1742
1743 static struct file_operations kvm_chardev_ops = {
1744         .unlocked_ioctl = kvm_dev_ioctl,
1745         .compat_ioctl   = kvm_dev_ioctl,
1746 };
1747
1748 static struct miscdevice kvm_dev = {
1749         KVM_MINOR,
1750         "kvm",
1751         &kvm_chardev_ops,
1752 };
1753
1754 static void hardware_enable(void *junk)
1755 {
1756         int cpu = raw_smp_processor_id();
1757         int r;
1758
1759         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1760                 return;
1761
1762         cpumask_set_cpu(cpu, cpus_hardware_enabled);
1763
1764         r = kvm_arch_hardware_enable(NULL);
1765
1766         if (r) {
1767                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1768                 atomic_inc(&hardware_enable_failed);
1769                 printk(KERN_INFO "kvm: enabling virtualization on "
1770                                  "CPU%d failed\n", cpu);
1771         }
1772 }
1773
1774 static void hardware_disable(void *junk)
1775 {
1776         int cpu = raw_smp_processor_id();
1777
1778         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1779                 return;
1780         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1781         kvm_arch_hardware_disable(NULL);
1782 }
1783
1784 static void hardware_disable_all_nolock(void)
1785 {
1786         BUG_ON(!kvm_usage_count);
1787
1788         kvm_usage_count--;
1789         if (!kvm_usage_count)
1790                 on_each_cpu(hardware_disable, NULL, 1);
1791 }
1792
1793 static void hardware_disable_all(void)
1794 {
1795         spin_lock(&kvm_lock);
1796         hardware_disable_all_nolock();
1797         spin_unlock(&kvm_lock);
1798 }
1799
1800 static int hardware_enable_all(void)
1801 {
1802         int r = 0;
1803
1804         spin_lock(&kvm_lock);
1805
1806         kvm_usage_count++;
1807         if (kvm_usage_count == 1) {
1808                 atomic_set(&hardware_enable_failed, 0);
1809                 on_each_cpu(hardware_enable, NULL, 1);
1810
1811                 if (atomic_read(&hardware_enable_failed)) {
1812                         hardware_disable_all_nolock();
1813                         r = -EBUSY;
1814                 }
1815         }
1816
1817         spin_unlock(&kvm_lock);
1818
1819         return r;
1820 }
1821
1822 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1823                            void *v)
1824 {
1825         int cpu = (long)v;
1826
1827         if (!kvm_usage_count)
1828                 return NOTIFY_OK;
1829
1830         val &= ~CPU_TASKS_FROZEN;
1831         switch (val) {
1832         case CPU_DYING:
1833                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1834                        cpu);
1835                 hardware_disable(NULL);
1836                 break;
1837         case CPU_UP_CANCELED:
1838                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1839                        cpu);
1840                 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1841                 break;
1842         case CPU_ONLINE:
1843                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1844                        cpu);
1845                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1846                 break;
1847         }
1848         return NOTIFY_OK;
1849 }
1850
1851
1852 asmlinkage void kvm_handle_fault_on_reboot(void)
1853 {
1854         if (kvm_rebooting)
1855                 /* spin while reset goes on */
1856                 while (true)
1857                         ;
1858         /* Fault while not rebooting.  We want the trace. */
1859         BUG();
1860 }
1861 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1862
1863 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1864                       void *v)
1865 {
1866         /*
1867          * Some (well, at least mine) BIOSes hang on reboot if
1868          * in vmx root mode.
1869          *
1870          * And Intel TXT required VMX off for all cpu when system shutdown.
1871          */
1872         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1873         kvm_rebooting = true;
1874         on_each_cpu(hardware_disable, NULL, 1);
1875         return NOTIFY_OK;
1876 }
1877
1878 static struct notifier_block kvm_reboot_notifier = {
1879         .notifier_call = kvm_reboot,
1880         .priority = 0,
1881 };
1882
1883 void kvm_io_bus_init(struct kvm_io_bus *bus)
1884 {
1885         memset(bus, 0, sizeof(*bus));
1886 }
1887
1888 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1889 {
1890         int i;
1891
1892         for (i = 0; i < bus->dev_count; i++) {
1893                 struct kvm_io_device *pos = bus->devs[i];
1894
1895                 kvm_iodevice_destructor(pos);
1896         }
1897 }
1898
1899 /* kvm_io_bus_write - called under kvm->slots_lock */
1900 int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
1901                      int len, const void *val)
1902 {
1903         int i;
1904         for (i = 0; i < bus->dev_count; i++)
1905                 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
1906                         return 0;
1907         return -EOPNOTSUPP;
1908 }
1909
1910 /* kvm_io_bus_read - called under kvm->slots_lock */
1911 int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
1912 {
1913         int i;
1914         for (i = 0; i < bus->dev_count; i++)
1915                 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
1916                         return 0;
1917         return -EOPNOTSUPP;
1918 }
1919
1920 int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
1921                              struct kvm_io_device *dev)
1922 {
1923         int ret;
1924
1925         down_write(&kvm->slots_lock);
1926         ret = __kvm_io_bus_register_dev(bus, dev);
1927         up_write(&kvm->slots_lock);
1928
1929         return ret;
1930 }
1931
1932 /* An unlocked version. Caller must have write lock on slots_lock. */
1933 int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
1934                               struct kvm_io_device *dev)
1935 {
1936         if (bus->dev_count > NR_IOBUS_DEVS-1)
1937                 return -ENOSPC;
1938
1939         bus->devs[bus->dev_count++] = dev;
1940
1941         return 0;
1942 }
1943
1944 void kvm_io_bus_unregister_dev(struct kvm *kvm,
1945                                struct kvm_io_bus *bus,
1946                                struct kvm_io_device *dev)
1947 {
1948         down_write(&kvm->slots_lock);
1949         __kvm_io_bus_unregister_dev(bus, dev);
1950         up_write(&kvm->slots_lock);
1951 }
1952
1953 /* An unlocked version. Caller must have write lock on slots_lock. */
1954 void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
1955                                  struct kvm_io_device *dev)
1956 {
1957         int i;
1958
1959         for (i = 0; i < bus->dev_count; i++)
1960                 if (bus->devs[i] == dev) {
1961                         bus->devs[i] = bus->devs[--bus->dev_count];
1962                         break;
1963                 }
1964 }
1965
1966 static struct notifier_block kvm_cpu_notifier = {
1967         .notifier_call = kvm_cpu_hotplug,
1968         .priority = 20, /* must be > scheduler priority */
1969 };
1970
1971 static int vm_stat_get(void *_offset, u64 *val)
1972 {
1973         unsigned offset = (long)_offset;
1974         struct kvm *kvm;
1975
1976         *val = 0;
1977         spin_lock(&kvm_lock);
1978         list_for_each_entry(kvm, &vm_list, vm_list)
1979                 *val += *(u32 *)((void *)kvm + offset);
1980         spin_unlock(&kvm_lock);
1981         return 0;
1982 }
1983
1984 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1985
1986 static int vcpu_stat_get(void *_offset, u64 *val)
1987 {
1988         unsigned offset = (long)_offset;
1989         struct kvm *kvm;
1990         struct kvm_vcpu *vcpu;
1991         int i;
1992
1993         *val = 0;
1994         spin_lock(&kvm_lock);
1995         list_for_each_entry(kvm, &vm_list, vm_list)
1996                 kvm_for_each_vcpu(i, vcpu, kvm)
1997                         *val += *(u32 *)((void *)vcpu + offset);
1998
1999         spin_unlock(&kvm_lock);
2000         return 0;
2001 }
2002
2003 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2004
2005 static const struct file_operations *stat_fops[] = {
2006         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2007         [KVM_STAT_VM]   = &vm_stat_fops,
2008 };
2009
2010 static void kvm_init_debug(void)
2011 {
2012         struct kvm_stats_debugfs_item *p;
2013
2014         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2015         for (p = debugfs_entries; p->name; ++p)
2016                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2017                                                 (void *)(long)p->offset,
2018                                                 stat_fops[p->kind]);
2019 }
2020
2021 static void kvm_exit_debug(void)
2022 {
2023         struct kvm_stats_debugfs_item *p;
2024
2025         for (p = debugfs_entries; p->name; ++p)
2026                 debugfs_remove(p->dentry);
2027         debugfs_remove(kvm_debugfs_dir);
2028 }
2029
2030 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2031 {
2032         if (kvm_usage_count)
2033                 hardware_disable(NULL);
2034         return 0;
2035 }
2036
2037 static int kvm_resume(struct sys_device *dev)
2038 {
2039         if (kvm_usage_count)
2040                 hardware_enable(NULL);
2041         return 0;
2042 }
2043
2044 static struct sysdev_class kvm_sysdev_class = {
2045         .name = "kvm",
2046         .suspend = kvm_suspend,
2047         .resume = kvm_resume,
2048 };
2049
2050 static struct sys_device kvm_sysdev = {
2051         .id = 0,
2052         .cls = &kvm_sysdev_class,
2053 };
2054
2055 struct page *bad_page;
2056 pfn_t bad_pfn;
2057
2058 static inline
2059 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2060 {
2061         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2062 }
2063
2064 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2065 {
2066         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2067
2068         kvm_arch_vcpu_load(vcpu, cpu);
2069 }
2070
2071 static void kvm_sched_out(struct preempt_notifier *pn,
2072                           struct task_struct *next)
2073 {
2074         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2075
2076         kvm_arch_vcpu_put(vcpu);
2077 }
2078
2079 int kvm_init(void *opaque, unsigned int vcpu_size,
2080                   struct module *module)
2081 {
2082         int r;
2083         int cpu;
2084
2085         r = kvm_arch_init(opaque);
2086         if (r)
2087                 goto out_fail;
2088
2089         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2090
2091         if (bad_page == NULL) {
2092                 r = -ENOMEM;
2093                 goto out;
2094         }
2095
2096         bad_pfn = page_to_pfn(bad_page);
2097
2098         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2099                 r = -ENOMEM;
2100                 goto out_free_0;
2101         }
2102
2103         r = kvm_arch_hardware_setup();
2104         if (r < 0)
2105                 goto out_free_0a;
2106
2107         for_each_online_cpu(cpu) {
2108                 smp_call_function_single(cpu,
2109                                 kvm_arch_check_processor_compat,
2110                                 &r, 1);
2111                 if (r < 0)
2112                         goto out_free_1;
2113         }
2114
2115         r = register_cpu_notifier(&kvm_cpu_notifier);
2116         if (r)
2117                 goto out_free_2;
2118         register_reboot_notifier(&kvm_reboot_notifier);
2119
2120         r = sysdev_class_register(&kvm_sysdev_class);
2121         if (r)
2122                 goto out_free_3;
2123
2124         r = sysdev_register(&kvm_sysdev);
2125         if (r)
2126                 goto out_free_4;
2127
2128         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2129         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2130                                            __alignof__(struct kvm_vcpu),
2131                                            0, NULL);
2132         if (!kvm_vcpu_cache) {
2133                 r = -ENOMEM;
2134                 goto out_free_5;
2135         }
2136
2137         kvm_chardev_ops.owner = module;
2138         kvm_vm_fops.owner = module;
2139         kvm_vcpu_fops.owner = module;
2140
2141         r = misc_register(&kvm_dev);
2142         if (r) {
2143                 printk(KERN_ERR "kvm: misc device register failed\n");
2144                 goto out_free;
2145         }
2146
2147         kvm_preempt_ops.sched_in = kvm_sched_in;
2148         kvm_preempt_ops.sched_out = kvm_sched_out;
2149
2150         kvm_init_debug();
2151
2152         return 0;
2153
2154 out_free:
2155         kmem_cache_destroy(kvm_vcpu_cache);
2156 out_free_5:
2157         sysdev_unregister(&kvm_sysdev);
2158 out_free_4:
2159         sysdev_class_unregister(&kvm_sysdev_class);
2160 out_free_3:
2161         unregister_reboot_notifier(&kvm_reboot_notifier);
2162         unregister_cpu_notifier(&kvm_cpu_notifier);
2163 out_free_2:
2164 out_free_1:
2165         kvm_arch_hardware_unsetup();
2166 out_free_0a:
2167         free_cpumask_var(cpus_hardware_enabled);
2168 out_free_0:
2169         __free_page(bad_page);
2170 out:
2171         kvm_arch_exit();
2172 out_fail:
2173         return r;
2174 }
2175 EXPORT_SYMBOL_GPL(kvm_init);
2176
2177 void kvm_exit(void)
2178 {
2179         tracepoint_synchronize_unregister();
2180         kvm_exit_debug();
2181         misc_deregister(&kvm_dev);
2182         kmem_cache_destroy(kvm_vcpu_cache);
2183         sysdev_unregister(&kvm_sysdev);
2184         sysdev_class_unregister(&kvm_sysdev_class);
2185         unregister_reboot_notifier(&kvm_reboot_notifier);
2186         unregister_cpu_notifier(&kvm_cpu_notifier);
2187         on_each_cpu(hardware_disable, NULL, 1);
2188         kvm_arch_hardware_unsetup();
2189         kvm_arch_exit();
2190         free_cpumask_var(cpus_hardware_enabled);
2191         __free_page(bad_page);
2192 }
2193 EXPORT_SYMBOL_GPL(kvm_exit);