SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  44 #include <asm/processor.h>
  45 #include <asm/io.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/pgtable.h>
  48
  49 MODULE_AUTHOR("Qumranet");
  50 MODULE_LICENSE("GPL");
  51
  52 DEFINE_SPINLOCK(kvm_lock);
  53 LIST_HEAD(vm_list);
  54
  55 static cpumask_t cpus_hardware_enabled;
  56
  57 struct kmem_cache *kvm_vcpu_cache;
  58 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  59
  60 static __read_mostly struct preempt_ops kvm_preempt_ops;
  61
  62 static struct dentry *debugfs_dir;
  63
  64 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  65                            unsigned long arg);
  66
  67 static inline int valid_vcpu(int n)
  68 {
  69         return likely(n >= 0 && n < KVM_MAX_VCPUS);
  70 }
  71
  72 /*
  73  * Switches to specified vcpu, until a matching vcpu_put()
  74  */
  75 void vcpu_load(struct kvm_vcpu *vcpu)
  76 {
  77         int cpu;
  78
  79         mutex_lock(&vcpu->mutex);
  80         cpu = get_cpu();
  81         preempt_notifier_register(&vcpu->preempt_notifier);
  82         kvm_arch_vcpu_load(vcpu, cpu);
  83         put_cpu();
  84 }
  85
  86 void vcpu_put(struct kvm_vcpu *vcpu)
  87 {
  88         preempt_disable();
  89         kvm_arch_vcpu_put(vcpu);
  90         preempt_notifier_unregister(&vcpu->preempt_notifier);
  91         preempt_enable();
  92         mutex_unlock(&vcpu->mutex);
  93 }
  94
  95 static void ack_flush(void *_completed)
  96 {
  97 }
  98
  99 void kvm_flush_remote_tlbs(struct kvm *kvm)
 100 {
 101         int i, cpu;
 102         cpumask_t cpus;
 103         struct kvm_vcpu *vcpu;
 104
 105         cpus_clear(cpus);
 106         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 107                 vcpu = kvm->vcpus[i];
 108                 if (!vcpu)
 109                         continue;
 110                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
 111                         continue;
 112                 cpu = vcpu->cpu;
 113                 if (cpu != -1 && cpu != raw_smp_processor_id())
 114                         cpu_set(cpu, cpus);
 115         }
 116         if (cpus_empty(cpus))
 117                 return;
 118         ++kvm->stat.remote_tlb_flush;
 119         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 120 }
 121
 122 void kvm_reload_remote_mmus(struct kvm *kvm)
 123 {
 124         int i, cpu;
 125         cpumask_t cpus;
 126         struct kvm_vcpu *vcpu;
 127
 128         cpus_clear(cpus);
 129         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 130                 vcpu = kvm->vcpus[i];
 131                 if (!vcpu)
 132                         continue;
 133                 if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
 134                         continue;
 135                 cpu = vcpu->cpu;
 136                 if (cpu != -1 && cpu != raw_smp_processor_id())
 137                         cpu_set(cpu, cpus);
 138         }
 139         if (cpus_empty(cpus))
 140                 return;
 141         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 142 }
 143
 144
 145 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 146 {
 147         struct page *page;
 148         int r;
 149
 150         mutex_init(&vcpu->mutex);
 151         vcpu->cpu = -1;
 152         vcpu->kvm = kvm;
 153         vcpu->vcpu_id = id;
 154         init_waitqueue_head(&vcpu->wq);
 155
 156         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 157         if (!page) {
 158                 r = -ENOMEM;
 159                 goto fail;
 160         }
 161         vcpu->run = page_address(page);
 162
 163         r = kvm_arch_vcpu_init(vcpu);
 164         if (r < 0)
 165                 goto fail_free_run;
 166         return 0;
 167
 168 fail_free_run:
 169         free_page((unsigned long)vcpu->run);
 170 fail:
 171         return r;
 172 }
 173 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 174
 175 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 176 {
 177         kvm_arch_vcpu_uninit(vcpu);
 178         free_page((unsigned long)vcpu->run);
 179 }
 180 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 181
 182 static struct kvm *kvm_create_vm(void)
 183 {
 184         struct kvm *kvm = kvm_arch_create_vm();
 185
 186         if (IS_ERR(kvm))
 187                 goto out;
 188
 189         kvm->mm = current->mm;
 190         atomic_inc(&kvm->mm->mm_count);
 191         spin_lock_init(&kvm->mmu_lock);
 192         kvm_io_bus_init(&kvm->pio_bus);
 193         mutex_init(&kvm->lock);
 194         kvm_io_bus_init(&kvm->mmio_bus);
 195         init_rwsem(&kvm->slots_lock);
 196         spin_lock(&kvm_lock);
 197         list_add(&kvm->vm_list, &vm_list);
 198         spin_unlock(&kvm_lock);
 199 out:
 200         return kvm;
 201 }
 202
 203 /*
 204  * Free any memory in @free but not in @dont.
 205  */
 206 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 207                                   struct kvm_memory_slot *dont)
 208 {
 209         if (!dont || free->rmap != dont->rmap)
 210                 vfree(free->rmap);
 211
 212         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 213                 vfree(free->dirty_bitmap);
 214
 215         free->npages = 0;
 216         free->dirty_bitmap = NULL;
 217         free->rmap = NULL;
 218 }
 219
 220 void kvm_free_physmem(struct kvm *kvm)
 221 {
 222         int i;
 223
 224         for (i = 0; i < kvm->nmemslots; ++i)
 225                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 226 }
 227
 228 static void kvm_destroy_vm(struct kvm *kvm)
 229 {
 230         struct mm_struct *mm = kvm->mm;
 231
 232         spin_lock(&kvm_lock);
 233         list_del(&kvm->vm_list);
 234         spin_unlock(&kvm_lock);
 235         kvm_io_bus_destroy(&kvm->pio_bus);
 236         kvm_io_bus_destroy(&kvm->mmio_bus);
 237         kvm_arch_destroy_vm(kvm);
 238         mmdrop(mm);
 239 }
 240
 241 static int kvm_vm_release(struct inode *inode, struct file *filp)
 242 {
 243         struct kvm *kvm = filp->private_data;
 244
 245         kvm_destroy_vm(kvm);
 246         return 0;
 247 }
 248
 249 /*
 250  * Allocate some memory and give it an address in the guest physical address
 251  * space.
 252  *
 253  * Discontiguous memory is allowed, mostly for framebuffers.
 254  *
 255  * Must be called holding mmap_sem for write.
 256  */
 257 int __kvm_set_memory_region(struct kvm *kvm,
 258                             struct kvm_userspace_memory_region *mem,
 259                             int user_alloc)
 260 {
 261         int r;
 262         gfn_t base_gfn;
 263         unsigned long npages;
 264         unsigned long i;
 265         struct kvm_memory_slot *memslot;
 266         struct kvm_memory_slot old, new;
 267
 268         r = -EINVAL;
 269         /* General sanity checks */
 270         if (mem->memory_size & (PAGE_SIZE - 1))
 271                 goto out;
 272         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 273                 goto out;
 274         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 275                 goto out;
 276         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 277                 goto out;
 278
 279         memslot = &kvm->memslots[mem->slot];
 280         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 281         npages = mem->memory_size >> PAGE_SHIFT;
 282
 283         if (!npages)
 284                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 285
 286         new = old = *memslot;
 287
 288         new.base_gfn = base_gfn;
 289         new.npages = npages;
 290         new.flags = mem->flags;
 291
 292         /* Disallow changing a memory slot's size. */
 293         r = -EINVAL;
 294         if (npages && old.npages && npages != old.npages)
 295                 goto out_free;
 296
 297         /* Check for overlaps */
 298         r = -EEXIST;
 299         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 300                 struct kvm_memory_slot *s = &kvm->memslots[i];
 301
 302                 if (s == memslot)
 303                         continue;
 304                 if (!((base_gfn + npages <= s->base_gfn) ||
 305                       (base_gfn >= s->base_gfn + s->npages)))
 306                         goto out_free;
 307         }
 308
 309         /* Free page dirty bitmap if unneeded */
 310         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 311                 new.dirty_bitmap = NULL;
 312
 313         r = -ENOMEM;
 314
 315         /* Allocate if a slot is being created */
 316         if (npages && !new.rmap) {
 317                 new.rmap = vmalloc(npages * sizeof(struct page *));
 318
 319                 if (!new.rmap)
 320                         goto out_free;
 321
 322                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 323
 324                 new.user_alloc = user_alloc;
 325                 new.userspace_addr = mem->userspace_addr;
 326         }
 327
 328         /* Allocate page dirty bitmap if needed */
 329         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 330                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 331
 332                 new.dirty_bitmap = vmalloc(dirty_bytes);
 333                 if (!new.dirty_bitmap)
 334                         goto out_free;
 335                 memset(new.dirty_bitmap, 0, dirty_bytes);
 336         }
 337
 338         if (mem->slot >= kvm->nmemslots)
 339                 kvm->nmemslots = mem->slot + 1;
 340
 341         *memslot = new;
 342
 343         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
 344         if (r) {
 345                 *memslot = old;
 346                 goto out_free;
 347         }
 348
 349         kvm_free_physmem_slot(&old, &new);
 350         return 0;
 351
 352 out_free:
 353         kvm_free_physmem_slot(&new, &old);
 354 out:
 355         return r;
 356
 357 }
 358 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 359
 360 int kvm_set_memory_region(struct kvm *kvm,
 361                           struct kvm_userspace_memory_region *mem,
 362                           int user_alloc)
 363 {
 364         int r;
 365
 366         down_write(&kvm->slots_lock);
 367         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 368         up_write(&kvm->slots_lock);
 369         return r;
 370 }
 371 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 372
 373 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 374                                    struct
 375                                    kvm_userspace_memory_region *mem,
 376                                    int user_alloc)
 377 {
 378         if (mem->slot >= KVM_MEMORY_SLOTS)
 379                 return -EINVAL;
 380         return kvm_set_memory_region(kvm, mem, user_alloc);
 381 }
 382
 383 int kvm_get_dirty_log(struct kvm *kvm,
 384                         struct kvm_dirty_log *log, int *is_dirty)
 385 {
 386         struct kvm_memory_slot *memslot;
 387         int r, i;
 388         int n;
 389         unsigned long any = 0;
 390
 391         r = -EINVAL;
 392         if (log->slot >= KVM_MEMORY_SLOTS)
 393                 goto out;
 394
 395         memslot = &kvm->memslots[log->slot];
 396         r = -ENOENT;
 397         if (!memslot->dirty_bitmap)
 398                 goto out;
 399
 400         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 401
 402         for (i = 0; !any && i < n/sizeof(long); ++i)
 403                 any = memslot->dirty_bitmap[i];
 404
 405         r = -EFAULT;
 406         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 407                 goto out;
 408
 409         if (any)
 410                 *is_dirty = 1;
 411
 412         r = 0;
 413 out:
 414         return r;
 415 }
 416
 417 int is_error_page(struct page *page)
 418 {
 419         return page == bad_page;
 420 }
 421 EXPORT_SYMBOL_GPL(is_error_page);
 422
 423 static inline unsigned long bad_hva(void)
 424 {
 425         return PAGE_OFFSET;
 426 }
 427
 428 int kvm_is_error_hva(unsigned long addr)
 429 {
 430         return addr == bad_hva();
 431 }
 432 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 433
 434 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 435 {
 436         int i;
 437
 438         for (i = 0; i < kvm->nmemslots; ++i) {
 439                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 440
 441                 if (gfn >= memslot->base_gfn
 442                     && gfn < memslot->base_gfn + memslot->npages)
 443                         return memslot;
 444         }
 445         return NULL;
 446 }
 447
 448 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 449 {
 450         gfn = unalias_gfn(kvm, gfn);
 451         return __gfn_to_memslot(kvm, gfn);
 452 }
 453
 454 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 455 {
 456         int i;
 457
 458         gfn = unalias_gfn(kvm, gfn);
 459         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 460                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 461
 462                 if (gfn >= memslot->base_gfn
 463                     && gfn < memslot->base_gfn + memslot->npages)
 464                         return 1;
 465         }
 466         return 0;
 467 }
 468 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 469
 470 static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 471 {
 472         struct kvm_memory_slot *slot;
 473
 474         gfn = unalias_gfn(kvm, gfn);
 475         slot = __gfn_to_memslot(kvm, gfn);
 476         if (!slot)
 477                 return bad_hva();
 478         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 479 }
 480
 481 /*
 482  * Requires current->mm->mmap_sem to be held
 483  */
 484 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 485 {
 486         struct page *page[1];
 487         unsigned long addr;
 488         int npages;
 489
 490         might_sleep();
 491
 492         addr = gfn_to_hva(kvm, gfn);
 493         if (kvm_is_error_hva(addr)) {
 494                 get_page(bad_page);
 495                 return bad_page;
 496         }
 497
 498         npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
 499                                 NULL);
 500
 501         if (npages != 1) {
 502                 get_page(bad_page);
 503                 return bad_page;
 504         }
 505
 506         return page[0];
 507 }
 508
 509 EXPORT_SYMBOL_GPL(gfn_to_page);
 510
 511 void kvm_release_page_clean(struct page *page)
 512 {
 513         put_page(page);
 514 }
 515 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
 516
 517 void kvm_release_page_dirty(struct page *page)
 518 {
 519         if (!PageReserved(page))
 520                 SetPageDirty(page);
 521         put_page(page);
 522 }
 523 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
 524
 525 static int next_segment(unsigned long len, int offset)
 526 {
 527         if (len > PAGE_SIZE - offset)
 528                 return PAGE_SIZE - offset;
 529         else
 530                 return len;
 531 }
 532
 533 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 534                         int len)
 535 {
 536         int r;
 537         unsigned long addr;
 538
 539         addr = gfn_to_hva(kvm, gfn);
 540         if (kvm_is_error_hva(addr))
 541                 return -EFAULT;
 542         r = copy_from_user(data, (void __user *)addr + offset, len);
 543         if (r)
 544                 return -EFAULT;
 545         return 0;
 546 }
 547 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
 548
 549 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
 550 {
 551         gfn_t gfn = gpa >> PAGE_SHIFT;
 552         int seg;
 553         int offset = offset_in_page(gpa);
 554         int ret;
 555
 556         while ((seg = next_segment(len, offset)) != 0) {
 557                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
 558                 if (ret < 0)
 559                         return ret;
 560                 offset = 0;
 561                 len -= seg;
 562                 data += seg;
 563                 ++gfn;
 564         }
 565         return 0;
 566 }
 567 EXPORT_SYMBOL_GPL(kvm_read_guest);
 568
 569 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 570                           unsigned long len)
 571 {
 572         int r;
 573         unsigned long addr;
 574         gfn_t gfn = gpa >> PAGE_SHIFT;
 575         int offset = offset_in_page(gpa);
 576
 577         addr = gfn_to_hva(kvm, gfn);
 578         if (kvm_is_error_hva(addr))
 579                 return -EFAULT;
 580         pagefault_disable();
 581         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
 582         pagefault_enable();
 583         if (r)
 584                 return -EFAULT;
 585         return 0;
 586 }
 587 EXPORT_SYMBOL(kvm_read_guest_atomic);
 588
 589 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 590                          int offset, int len)
 591 {
 592         int r;
 593         unsigned long addr;
 594
 595         addr = gfn_to_hva(kvm, gfn);
 596         if (kvm_is_error_hva(addr))
 597                 return -EFAULT;
 598         r = copy_to_user((void __user *)addr + offset, data, len);
 599         if (r)
 600                 return -EFAULT;
 601         mark_page_dirty(kvm, gfn);
 602         return 0;
 603 }
 604 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
 605
 606 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 607                     unsigned long len)
 608 {
 609         gfn_t gfn = gpa >> PAGE_SHIFT;
 610         int seg;
 611         int offset = offset_in_page(gpa);
 612         int ret;
 613
 614         while ((seg = next_segment(len, offset)) != 0) {
 615                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
 616                 if (ret < 0)
 617                         return ret;
 618                 offset = 0;
 619                 len -= seg;
 620                 data += seg;
 621                 ++gfn;
 622         }
 623         return 0;
 624 }
 625
 626 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 627 {
 628         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
 629 }
 630 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
 631
 632 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
 633 {
 634         gfn_t gfn = gpa >> PAGE_SHIFT;
 635         int seg;
 636         int offset = offset_in_page(gpa);
 637         int ret;
 638
 639         while ((seg = next_segment(len, offset)) != 0) {
 640                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
 641                 if (ret < 0)
 642                         return ret;
 643                 offset = 0;
 644                 len -= seg;
 645                 ++gfn;
 646         }
 647         return 0;
 648 }
 649 EXPORT_SYMBOL_GPL(kvm_clear_guest);
 650
 651 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 652 {
 653         struct kvm_memory_slot *memslot;
 654
 655         gfn = unalias_gfn(kvm, gfn);
 656         memslot = __gfn_to_memslot(kvm, gfn);
 657         if (memslot && memslot->dirty_bitmap) {
 658                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 659
 660                 /* avoid RMW */
 661                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 662                         set_bit(rel_gfn, memslot->dirty_bitmap);
 663         }
 664 }
 665
 666 /*
 667  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
 668  */
 669 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 670 {
 671         DECLARE_WAITQUEUE(wait, current);
 672
 673         add_wait_queue(&vcpu->wq, &wait);
 674
 675         /*
 676          * We will block until either an interrupt or a signal wakes us up
 677          */
 678         while (!kvm_cpu_has_interrupt(vcpu)
 679                && !signal_pending(current)
 680                && !kvm_arch_vcpu_runnable(vcpu)) {
 681                 set_current_state(TASK_INTERRUPTIBLE);
 682                 vcpu_put(vcpu);
 683                 schedule();
 684                 vcpu_load(vcpu);
 685         }
 686
 687         __set_current_state(TASK_RUNNING);
 688         remove_wait_queue(&vcpu->wq, &wait);
 689 }
 690
 691 void kvm_resched(struct kvm_vcpu *vcpu)
 692 {
 693         if (!need_resched())
 694                 return;
 695         cond_resched();
 696 }
 697 EXPORT_SYMBOL_GPL(kvm_resched);
 698
 699 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 700 {
 701         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
 702         struct page *page;
 703
 704         if (vmf->pgoff == 0)
 705                 page = virt_to_page(vcpu->run);
 706 #ifdef CONFIG_X86
 707         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
 708                 page = virt_to_page(vcpu->arch.pio_data);
 709 #endif
 710         else
 711                 return VM_FAULT_SIGBUS;
 712         get_page(page);
 713         vmf->page = page;
 714         return 0;
 715 }
 716
 717 static struct vm_operations_struct kvm_vcpu_vm_ops = {
 718         .fault = kvm_vcpu_fault,
 719 };
 720
 721 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
 722 {
 723         vma->vm_ops = &kvm_vcpu_vm_ops;
 724         return 0;
 725 }
 726
 727 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
 728 {
 729         struct kvm_vcpu *vcpu = filp->private_data;
 730
 731         fput(vcpu->kvm->filp);
 732         return 0;
 733 }
 734
 735 static const struct file_operations kvm_vcpu_fops = {
 736         .release        = kvm_vcpu_release,
 737         .unlocked_ioctl = kvm_vcpu_ioctl,
 738         .compat_ioctl   = kvm_vcpu_ioctl,
 739         .mmap           = kvm_vcpu_mmap,
 740 };
 741
 742 /*
 743  * Allocates an inode for the vcpu.
 744  */
 745 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 746 {
 747         int fd, r;
 748         struct inode *inode;
 749         struct file *file;
 750
 751         r = anon_inode_getfd(&fd, &inode, &file,
 752                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
 753         if (r)
 754                 return r;
 755         atomic_inc(&vcpu->kvm->filp->f_count);
 756         return fd;
 757 }
 758
 759 /*
 760  * Creates some virtual cpus.  Good luck creating more than one.
 761  */
 762 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 763 {
 764         int r;
 765         struct kvm_vcpu *vcpu;
 766
 767         if (!valid_vcpu(n))
 768                 return -EINVAL;
 769
 770         vcpu = kvm_arch_vcpu_create(kvm, n);
 771         if (IS_ERR(vcpu))
 772                 return PTR_ERR(vcpu);
 773
 774         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 775
 776         r = kvm_arch_vcpu_setup(vcpu);
 777         if (r)
 778                 goto vcpu_destroy;
 779
 780         mutex_lock(&kvm->lock);
 781         if (kvm->vcpus[n]) {
 782                 r = -EEXIST;
 783                 mutex_unlock(&kvm->lock);
 784                 goto vcpu_destroy;
 785         }
 786         kvm->vcpus[n] = vcpu;
 787         mutex_unlock(&kvm->lock);
 788
 789         /* Now it's all set up, let userspace reach it */
 790         r = create_vcpu_fd(vcpu);
 791         if (r < 0)
 792                 goto unlink;
 793         return r;
 794
 795 unlink:
 796         mutex_lock(&kvm->lock);
 797         kvm->vcpus[n] = NULL;
 798         mutex_unlock(&kvm->lock);
 799 vcpu_destroy:
 800         kvm_arch_vcpu_destroy(vcpu);
 801         return r;
 802 }
 803
 804 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 805 {
 806         if (sigset) {
 807                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 808                 vcpu->sigset_active = 1;
 809                 vcpu->sigset = *sigset;
 810         } else
 811                 vcpu->sigset_active = 0;
 812         return 0;
 813 }
 814
 815 static long kvm_vcpu_ioctl(struct file *filp,
 816                            unsigned int ioctl, unsigned long arg)
 817 {
 818         struct kvm_vcpu *vcpu = filp->private_data;
 819         void __user *argp = (void __user *)arg;
 820         int r;
 821
 822         if (vcpu->kvm->mm != current->mm)
 823                 return -EIO;
 824         switch (ioctl) {
 825         case KVM_RUN:
 826                 r = -EINVAL;
 827                 if (arg)
 828                         goto out;
 829                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
 830                 break;
 831         case KVM_GET_REGS: {
 832                 struct kvm_regs kvm_regs;
 833
 834                 memset(&kvm_regs, 0, sizeof kvm_regs);
 835                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
 836                 if (r)
 837                         goto out;
 838                 r = -EFAULT;
 839                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
 840                         goto out;
 841                 r = 0;
 842                 break;
 843         }
 844         case KVM_SET_REGS: {
 845                 struct kvm_regs kvm_regs;
 846
 847                 r = -EFAULT;
 848                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
 849                         goto out;
 850                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
 851                 if (r)
 852                         goto out;
 853                 r = 0;
 854                 break;
 855         }
 856         case KVM_GET_SREGS: {
 857                 struct kvm_sregs kvm_sregs;
 858
 859                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
 860                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
 861                 if (r)
 862                         goto out;
 863                 r = -EFAULT;
 864                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
 865                         goto out;
 866                 r = 0;
 867                 break;
 868         }
 869         case KVM_SET_SREGS: {
 870                 struct kvm_sregs kvm_sregs;
 871
 872                 r = -EFAULT;
 873                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
 874                         goto out;
 875                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
 876                 if (r)
 877                         goto out;
 878                 r = 0;
 879                 break;
 880         }
 881         case KVM_TRANSLATE: {
 882                 struct kvm_translation tr;
 883
 884                 r = -EFAULT;
 885                 if (copy_from_user(&tr, argp, sizeof tr))
 886                         goto out;
 887                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
 888                 if (r)
 889                         goto out;
 890                 r = -EFAULT;
 891                 if (copy_to_user(argp, &tr, sizeof tr))
 892                         goto out;
 893                 r = 0;
 894                 break;
 895         }
 896         case KVM_DEBUG_GUEST: {
 897                 struct kvm_debug_guest dbg;
 898
 899                 r = -EFAULT;
 900                 if (copy_from_user(&dbg, argp, sizeof dbg))
 901                         goto out;
 902                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
 903                 if (r)
 904                         goto out;
 905                 r = 0;
 906                 break;
 907         }
 908         case KVM_SET_SIGNAL_MASK: {
 909                 struct kvm_signal_mask __user *sigmask_arg = argp;
 910                 struct kvm_signal_mask kvm_sigmask;
 911                 sigset_t sigset, *p;
 912
 913                 p = NULL;
 914                 if (argp) {
 915                         r = -EFAULT;
 916                         if (copy_from_user(&kvm_sigmask, argp,
 917                                            sizeof kvm_sigmask))
 918                                 goto out;
 919                         r = -EINVAL;
 920                         if (kvm_sigmask.len != sizeof sigset)
 921                                 goto out;
 922                         r = -EFAULT;
 923                         if (copy_from_user(&sigset, sigmask_arg->sigset,
 924                                            sizeof sigset))
 925                                 goto out;
 926                         p = &sigset;
 927                 }
 928                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
 929                 break;
 930         }
 931         case KVM_GET_FPU: {
 932                 struct kvm_fpu fpu;
 933
 934                 memset(&fpu, 0, sizeof fpu);
 935                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
 936                 if (r)
 937                         goto out;
 938                 r = -EFAULT;
 939                 if (copy_to_user(argp, &fpu, sizeof fpu))
 940                         goto out;
 941                 r = 0;
 942                 break;
 943         }
 944         case KVM_SET_FPU: {
 945                 struct kvm_fpu fpu;
 946
 947                 r = -EFAULT;
 948                 if (copy_from_user(&fpu, argp, sizeof fpu))
 949                         goto out;
 950                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
 951                 if (r)
 952                         goto out;
 953                 r = 0;
 954                 break;
 955         }
 956         default:
 957                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 958         }
 959 out:
 960         return r;
 961 }
 962
 963 static long kvm_vm_ioctl(struct file *filp,
 964                            unsigned int ioctl, unsigned long arg)
 965 {
 966         struct kvm *kvm = filp->private_data;
 967         void __user *argp = (void __user *)arg;
 968         int r;
 969
 970         if (kvm->mm != current->mm)
 971                 return -EIO;
 972         switch (ioctl) {
 973         case KVM_CREATE_VCPU:
 974                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
 975                 if (r < 0)
 976                         goto out;
 977                 break;
 978         case KVM_SET_USER_MEMORY_REGION: {
 979                 struct kvm_userspace_memory_region kvm_userspace_mem;
 980
 981                 r = -EFAULT;
 982                 if (copy_from_user(&kvm_userspace_mem, argp,
 983                                                 sizeof kvm_userspace_mem))
 984                         goto out;
 985
 986                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
 987                 if (r)
 988                         goto out;
 989                 break;
 990         }
 991         case KVM_GET_DIRTY_LOG: {
 992                 struct kvm_dirty_log log;
 993
 994                 r = -EFAULT;
 995                 if (copy_from_user(&log, argp, sizeof log))
 996                         goto out;
 997                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
 998                 if (r)
 999                         goto out;
1000                 break;
1001         }
1002         default:
1003                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1004         }
1005 out:
1006         return r;
1007 }
1008
1009 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1010 {
1011         struct kvm *kvm = vma->vm_file->private_data;
1012         struct page *page;
1013
1014         if (!kvm_is_visible_gfn(kvm, vmf->pgoff))
1015                 return VM_FAULT_SIGBUS;
1016         page = gfn_to_page(kvm, vmf->pgoff);
1017         if (is_error_page(page)) {
1018                 kvm_release_page_clean(page);
1019                 return VM_FAULT_SIGBUS;
1020         }
1021         vmf->page = page;
1022         return 0;
1023 }
1024
1025 static struct vm_operations_struct kvm_vm_vm_ops = {
1026         .fault = kvm_vm_fault,
1027 };
1028
1029 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1030 {
1031         vma->vm_ops = &kvm_vm_vm_ops;
1032         return 0;
1033 }
1034
1035 static const struct file_operations kvm_vm_fops = {
1036         .release        = kvm_vm_release,
1037         .unlocked_ioctl = kvm_vm_ioctl,
1038         .compat_ioctl   = kvm_vm_ioctl,
1039         .mmap           = kvm_vm_mmap,
1040 };
1041
1042 static int kvm_dev_ioctl_create_vm(void)
1043 {
1044         int fd, r;
1045         struct inode *inode;
1046         struct file *file;
1047         struct kvm *kvm;
1048
1049         kvm = kvm_create_vm();
1050         if (IS_ERR(kvm))
1051                 return PTR_ERR(kvm);
1052         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1053         if (r) {
1054                 kvm_destroy_vm(kvm);
1055                 return r;
1056         }
1057
1058         kvm->filp = file;
1059
1060         return fd;
1061 }
1062
1063 static long kvm_dev_ioctl(struct file *filp,
1064                           unsigned int ioctl, unsigned long arg)
1065 {
1066         void __user *argp = (void __user *)arg;
1067         long r = -EINVAL;
1068
1069         switch (ioctl) {
1070         case KVM_GET_API_VERSION:
1071                 r = -EINVAL;
1072                 if (arg)
1073                         goto out;
1074                 r = KVM_API_VERSION;
1075                 break;
1076         case KVM_CREATE_VM:
1077                 r = -EINVAL;
1078                 if (arg)
1079                         goto out;
1080                 r = kvm_dev_ioctl_create_vm();
1081                 break;
1082         case KVM_CHECK_EXTENSION:
1083                 r = kvm_dev_ioctl_check_extension((long)argp);
1084                 break;
1085         case KVM_GET_VCPU_MMAP_SIZE:
1086                 r = -EINVAL;
1087                 if (arg)
1088                         goto out;
1089                 r = PAGE_SIZE;     /* struct kvm_run */
1090 #ifdef CONFIG_X86
1091                 r += PAGE_SIZE;    /* pio data page */
1092 #endif
1093                 break;
1094         default:
1095                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1096         }
1097 out:
1098         return r;
1099 }
1100
1101 static struct file_operations kvm_chardev_ops = {
1102         .unlocked_ioctl = kvm_dev_ioctl,
1103         .compat_ioctl   = kvm_dev_ioctl,
1104 };
1105
1106 static struct miscdevice kvm_dev = {
1107         KVM_MINOR,
1108         "kvm",
1109         &kvm_chardev_ops,
1110 };
1111
1112 static void hardware_enable(void *junk)
1113 {
1114         int cpu = raw_smp_processor_id();
1115
1116         if (cpu_isset(cpu, cpus_hardware_enabled))
1117                 return;
1118         cpu_set(cpu, cpus_hardware_enabled);
1119         kvm_arch_hardware_enable(NULL);
1120 }
1121
1122 static void hardware_disable(void *junk)
1123 {
1124         int cpu = raw_smp_processor_id();
1125
1126         if (!cpu_isset(cpu, cpus_hardware_enabled))
1127                 return;
1128         cpu_clear(cpu, cpus_hardware_enabled);
1129         decache_vcpus_on_cpu(cpu);
1130         kvm_arch_hardware_disable(NULL);
1131 }
1132
1133 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1134                            void *v)
1135 {
1136         int cpu = (long)v;
1137
1138         val &= ~CPU_TASKS_FROZEN;
1139         switch (val) {
1140         case CPU_DYING:
1141                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1142                        cpu);
1143                 hardware_disable(NULL);
1144                 break;
1145         case CPU_UP_CANCELED:
1146                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1147                        cpu);
1148                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
1149                 break;
1150         case CPU_ONLINE:
1151                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1152                        cpu);
1153                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
1154                 break;
1155         }
1156         return NOTIFY_OK;
1157 }
1158
1159 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1160                       void *v)
1161 {
1162         if (val == SYS_RESTART) {
1163                 /*
1164                  * Some (well, at least mine) BIOSes hang on reboot if
1165                  * in vmx root mode.
1166                  */
1167                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1168                 on_each_cpu(hardware_disable, NULL, 0, 1);
1169         }
1170         return NOTIFY_OK;
1171 }
1172
1173 static struct notifier_block kvm_reboot_notifier = {
1174         .notifier_call = kvm_reboot,
1175         .priority = 0,
1176 };
1177
1178 void kvm_io_bus_init(struct kvm_io_bus *bus)
1179 {
1180         memset(bus, 0, sizeof(*bus));
1181 }
1182
1183 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1184 {
1185         int i;
1186
1187         for (i = 0; i < bus->dev_count; i++) {
1188                 struct kvm_io_device *pos = bus->devs[i];
1189
1190                 kvm_iodevice_destructor(pos);
1191         }
1192 }
1193
1194 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
1195 {
1196         int i;
1197
1198         for (i = 0; i < bus->dev_count; i++) {
1199                 struct kvm_io_device *pos = bus->devs[i];
1200
1201                 if (pos->in_range(pos, addr))
1202                         return pos;
1203         }
1204
1205         return NULL;
1206 }
1207
1208 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1209 {
1210         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1211
1212         bus->devs[bus->dev_count++] = dev;
1213 }
1214
1215 static struct notifier_block kvm_cpu_notifier = {
1216         .notifier_call = kvm_cpu_hotplug,
1217         .priority = 20, /* must be > scheduler priority */
1218 };
1219
1220 static int vm_stat_get(void *_offset, u64 *val)
1221 {
1222         unsigned offset = (long)_offset;
1223         struct kvm *kvm;
1224
1225         *val = 0;
1226         spin_lock(&kvm_lock);
1227         list_for_each_entry(kvm, &vm_list, vm_list)
1228                 *val += *(u32 *)((void *)kvm + offset);
1229         spin_unlock(&kvm_lock);
1230         return 0;
1231 }
1232
1233 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1234
1235 static int vcpu_stat_get(void *_offset, u64 *val)
1236 {
1237         unsigned offset = (long)_offset;
1238         struct kvm *kvm;
1239         struct kvm_vcpu *vcpu;
1240         int i;
1241
1242         *val = 0;
1243         spin_lock(&kvm_lock);
1244         list_for_each_entry(kvm, &vm_list, vm_list)
1245                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1246                         vcpu = kvm->vcpus[i];
1247                         if (vcpu)
1248                                 *val += *(u32 *)((void *)vcpu + offset);
1249                 }
1250         spin_unlock(&kvm_lock);
1251         return 0;
1252 }
1253
1254 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1255
1256 static struct file_operations *stat_fops[] = {
1257         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1258         [KVM_STAT_VM]   = &vm_stat_fops,
1259 };
1260
1261 static void kvm_init_debug(void)
1262 {
1263         struct kvm_stats_debugfs_item *p;
1264
1265         debugfs_dir = debugfs_create_dir("kvm", NULL);
1266         for (p = debugfs_entries; p->name; ++p)
1267                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
1268                                                 (void *)(long)p->offset,
1269                                                 stat_fops[p->kind]);
1270 }
1271
1272 static void kvm_exit_debug(void)
1273 {
1274         struct kvm_stats_debugfs_item *p;
1275
1276         for (p = debugfs_entries; p->name; ++p)
1277                 debugfs_remove(p->dentry);
1278         debugfs_remove(debugfs_dir);
1279 }
1280
1281 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1282 {
1283         hardware_disable(NULL);
1284         return 0;
1285 }
1286
1287 static int kvm_resume(struct sys_device *dev)
1288 {
1289         hardware_enable(NULL);
1290         return 0;
1291 }
1292
1293 static struct sysdev_class kvm_sysdev_class = {
1294         .name = "kvm",
1295         .suspend = kvm_suspend,
1296         .resume = kvm_resume,
1297 };
1298
1299 static struct sys_device kvm_sysdev = {
1300         .id = 0,
1301         .cls = &kvm_sysdev_class,
1302 };
1303
1304 struct page *bad_page;
1305
1306 static inline
1307 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1308 {
1309         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1310 }
1311
1312 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1313 {
1314         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1315
1316         kvm_arch_vcpu_load(vcpu, cpu);
1317 }
1318
1319 static void kvm_sched_out(struct preempt_notifier *pn,
1320                           struct task_struct *next)
1321 {
1322         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1323
1324         kvm_arch_vcpu_put(vcpu);
1325 }
1326
1327 int kvm_init(void *opaque, unsigned int vcpu_size,
1328                   struct module *module)
1329 {
1330         int r;
1331         int cpu;
1332
1333         kvm_init_debug();
1334
1335         r = kvm_arch_init(opaque);
1336         if (r)
1337                 goto out_fail;
1338
1339         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1340
1341         if (bad_page == NULL) {
1342                 r = -ENOMEM;
1343                 goto out;
1344         }
1345
1346         r = kvm_arch_hardware_setup();
1347         if (r < 0)
1348                 goto out_free_0;
1349
1350         for_each_online_cpu(cpu) {
1351                 smp_call_function_single(cpu,
1352                                 kvm_arch_check_processor_compat,
1353                                 &r, 0, 1);
1354                 if (r < 0)
1355                         goto out_free_1;
1356         }
1357
1358         on_each_cpu(hardware_enable, NULL, 0, 1);
1359         r = register_cpu_notifier(&kvm_cpu_notifier);
1360         if (r)
1361                 goto out_free_2;
1362         register_reboot_notifier(&kvm_reboot_notifier);
1363
1364         r = sysdev_class_register(&kvm_sysdev_class);
1365         if (r)
1366                 goto out_free_3;
1367
1368         r = sysdev_register(&kvm_sysdev);
1369         if (r)
1370                 goto out_free_4;
1371
1372         /* A kmem cache lets us meet the alignment requirements of fx_save. */
1373         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1374                                            __alignof__(struct kvm_vcpu),
1375                                            0, NULL);
1376         if (!kvm_vcpu_cache) {
1377                 r = -ENOMEM;
1378                 goto out_free_5;
1379         }
1380
1381         kvm_chardev_ops.owner = module;
1382
1383         r = misc_register(&kvm_dev);
1384         if (r) {
1385                 printk(KERN_ERR "kvm: misc device register failed\n");
1386                 goto out_free;
1387         }
1388
1389         kvm_preempt_ops.sched_in = kvm_sched_in;
1390         kvm_preempt_ops.sched_out = kvm_sched_out;
1391
1392         return 0;
1393
1394 out_free:
1395         kmem_cache_destroy(kvm_vcpu_cache);
1396 out_free_5:
1397         sysdev_unregister(&kvm_sysdev);
1398 out_free_4:
1399         sysdev_class_unregister(&kvm_sysdev_class);
1400 out_free_3:
1401         unregister_reboot_notifier(&kvm_reboot_notifier);
1402         unregister_cpu_notifier(&kvm_cpu_notifier);
1403 out_free_2:
1404         on_each_cpu(hardware_disable, NULL, 0, 1);
1405 out_free_1:
1406         kvm_arch_hardware_unsetup();
1407 out_free_0:
1408         __free_page(bad_page);
1409 out:
1410         kvm_arch_exit();
1411         kvm_exit_debug();
1412 out_fail:
1413         return r;
1414 }
1415 EXPORT_SYMBOL_GPL(kvm_init);
1416
1417 void kvm_exit(void)
1418 {
1419         misc_deregister(&kvm_dev);
1420         kmem_cache_destroy(kvm_vcpu_cache);
1421         sysdev_unregister(&kvm_sysdev);
1422         sysdev_class_unregister(&kvm_sysdev_class);
1423         unregister_reboot_notifier(&kvm_reboot_notifier);
1424         unregister_cpu_notifier(&kvm_cpu_notifier);
1425         on_each_cpu(hardware_disable, NULL, 0, 1);
1426         kvm_arch_hardware_unsetup();
1427         kvm_arch_exit();
1428         kvm_exit_debug();
1429         __free_page(bad_page);
1430 }
1431 EXPORT_SYMBOL_GPL(kvm_exit);