drivers/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 "kvm.h"
  19 #include "x86.h"
  20 #include "irq.h"
  21
  22 #include <linux/kvm.h>
  23 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/percpu.h>
  26 #include <linux/gfp.h>
  27 #include <linux/mm.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/reboot.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/highmem.h>
  33 #include <linux/file.h>
  34 #include <linux/sysdev.h>
  35 #include <linux/cpu.h>
  36 #include <linux/sched.h>
  37 #include <linux/cpumask.h>
  38 #include <linux/smp.h>
  39 #include <linux/anon_inodes.h>
  40 #include <linux/profile.h>
  41 #include <linux/kvm_para.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mman.h>
  44
  45 #include <asm/processor.h>
  46 #include <asm/io.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/desc.h>
  49 #include <asm/pgtable.h>
  50
  51 MODULE_AUTHOR("Qumranet");
  52 MODULE_LICENSE("GPL");
  53
  54 DEFINE_SPINLOCK(kvm_lock);
  55 LIST_HEAD(vm_list);
  56
  57 static cpumask_t cpus_hardware_enabled;
  58
  59 struct kmem_cache *kvm_vcpu_cache;
  60 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  61
  62 static __read_mostly struct preempt_ops kvm_preempt_ops;
  63
  64 static struct dentry *debugfs_dir;
  65
  66 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  67                            unsigned long arg);
  68
  69 static inline int valid_vcpu(int n)
  70 {
  71         return likely(n >= 0 && n < KVM_MAX_VCPUS);
  72 }
  73
  74 /*
  75  * Switches to specified vcpu, until a matching vcpu_put()
  76  */
  77 void vcpu_load(struct kvm_vcpu *vcpu)
  78 {
  79         int cpu;
  80
  81         mutex_lock(&vcpu->mutex);
  82         cpu = get_cpu();
  83         preempt_notifier_register(&vcpu->preempt_notifier);
  84         kvm_arch_vcpu_load(vcpu, cpu);
  85         put_cpu();
  86 }
  87
  88 void vcpu_put(struct kvm_vcpu *vcpu)
  89 {
  90         preempt_disable();
  91         kvm_arch_vcpu_put(vcpu);
  92         preempt_notifier_unregister(&vcpu->preempt_notifier);
  93         preempt_enable();
  94         mutex_unlock(&vcpu->mutex);
  95 }
  96
  97 static void ack_flush(void *_completed)
  98 {
  99 }
 100
 101 void kvm_flush_remote_tlbs(struct kvm *kvm)
 102 {
 103         int i, cpu;
 104         cpumask_t cpus;
 105         struct kvm_vcpu *vcpu;
 106
 107         cpus_clear(cpus);
 108         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 109                 vcpu = kvm->vcpus[i];
 110                 if (!vcpu)
 111                         continue;
 112                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
 113                         continue;
 114                 cpu = vcpu->cpu;
 115                 if (cpu != -1 && cpu != raw_smp_processor_id())
 116                         cpu_set(cpu, cpus);
 117         }
 118         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 119 }
 120
 121 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 122 {
 123         struct page *page;
 124         int r;
 125
 126         mutex_init(&vcpu->mutex);
 127         vcpu->cpu = -1;
 128         vcpu->kvm = kvm;
 129         vcpu->vcpu_id = id;
 130         init_waitqueue_head(&vcpu->wq);
 131
 132         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 133         if (!page) {
 134                 r = -ENOMEM;
 135                 goto fail;
 136         }
 137         vcpu->run = page_address(page);
 138
 139         r = kvm_arch_vcpu_init(vcpu);
 140         if (r < 0)
 141                 goto fail_free_run;
 142         return 0;
 143
 144 fail_free_run:
 145         free_page((unsigned long)vcpu->run);
 146 fail:
 147         return r;
 148 }
 149 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 150
 151 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 152 {
 153         kvm_arch_vcpu_uninit(vcpu);
 154         free_page((unsigned long)vcpu->run);
 155 }
 156 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 157
 158 static struct kvm *kvm_create_vm(void)
 159 {
 160         struct kvm *kvm = kvm_arch_create_vm();
 161
 162         if (IS_ERR(kvm))
 163                 goto out;
 164
 165         kvm_io_bus_init(&kvm->pio_bus);
 166         mutex_init(&kvm->lock);
 167         kvm_io_bus_init(&kvm->mmio_bus);
 168         spin_lock(&kvm_lock);
 169         list_add(&kvm->vm_list, &vm_list);
 170         spin_unlock(&kvm_lock);
 171 out:
 172         return kvm;
 173 }
 174
 175 /*
 176  * Free any memory in @free but not in @dont.
 177  */
 178 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 179                                   struct kvm_memory_slot *dont)
 180 {
 181         if (!dont || free->rmap != dont->rmap)
 182                 vfree(free->rmap);
 183
 184         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 185                 vfree(free->dirty_bitmap);
 186
 187         free->npages = 0;
 188         free->dirty_bitmap = NULL;
 189         free->rmap = NULL;
 190 }
 191
 192 void kvm_free_physmem(struct kvm *kvm)
 193 {
 194         int i;
 195
 196         for (i = 0; i < kvm->nmemslots; ++i)
 197                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 198 }
 199
 200 static void kvm_destroy_vm(struct kvm *kvm)
 201 {
 202         spin_lock(&kvm_lock);
 203         list_del(&kvm->vm_list);
 204         spin_unlock(&kvm_lock);
 205         kvm_io_bus_destroy(&kvm->pio_bus);
 206         kvm_io_bus_destroy(&kvm->mmio_bus);
 207         kvm_arch_destroy_vm(kvm);
 208 }
 209
 210 static int kvm_vm_release(struct inode *inode, struct file *filp)
 211 {
 212         struct kvm *kvm = filp->private_data;
 213
 214         kvm_destroy_vm(kvm);
 215         return 0;
 216 }
 217
 218 /*
 219  * Allocate some memory and give it an address in the guest physical address
 220  * space.
 221  *
 222  * Discontiguous memory is allowed, mostly for framebuffers.
 223  *
 224  * Must be called holding kvm->lock.
 225  */
 226 int __kvm_set_memory_region(struct kvm *kvm,
 227                             struct kvm_userspace_memory_region *mem,
 228                             int user_alloc)
 229 {
 230         int r;
 231         gfn_t base_gfn;
 232         unsigned long npages;
 233         unsigned long i;
 234         struct kvm_memory_slot *memslot;
 235         struct kvm_memory_slot old, new;
 236
 237         r = -EINVAL;
 238         /* General sanity checks */
 239         if (mem->memory_size & (PAGE_SIZE - 1))
 240                 goto out;
 241         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 242                 goto out;
 243         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 244                 goto out;
 245         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 246                 goto out;
 247
 248         memslot = &kvm->memslots[mem->slot];
 249         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 250         npages = mem->memory_size >> PAGE_SHIFT;
 251
 252         if (!npages)
 253                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 254
 255         new = old = *memslot;
 256
 257         new.base_gfn = base_gfn;
 258         new.npages = npages;
 259         new.flags = mem->flags;
 260
 261         /* Disallow changing a memory slot's size. */
 262         r = -EINVAL;
 263         if (npages && old.npages && npages != old.npages)
 264                 goto out_free;
 265
 266         /* Check for overlaps */
 267         r = -EEXIST;
 268         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 269                 struct kvm_memory_slot *s = &kvm->memslots[i];
 270
 271                 if (s == memslot)
 272                         continue;
 273                 if (!((base_gfn + npages <= s->base_gfn) ||
 274                       (base_gfn >= s->base_gfn + s->npages)))
 275                         goto out_free;
 276         }
 277
 278         /* Free page dirty bitmap if unneeded */
 279         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 280                 new.dirty_bitmap = NULL;
 281
 282         r = -ENOMEM;
 283
 284         /* Allocate if a slot is being created */
 285         if (npages && !new.rmap) {
 286                 new.rmap = vmalloc(npages * sizeof(struct page *));
 287
 288                 if (!new.rmap)
 289                         goto out_free;
 290
 291                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 292
 293                 new.user_alloc = user_alloc;
 294                 if (user_alloc)
 295                         new.userspace_addr = mem->userspace_addr;
 296                 else {
 297                         down_write(&current->mm->mmap_sem);
 298                         new.userspace_addr = do_mmap(NULL, 0,
 299                                                      npages * PAGE_SIZE,
 300                                                      PROT_READ | PROT_WRITE,
 301                                                      MAP_SHARED | MAP_ANONYMOUS,
 302                                                      0);
 303                         up_write(&current->mm->mmap_sem);
 304
 305                         if (IS_ERR((void *)new.userspace_addr))
 306                                 goto out_free;
 307                 }
 308         } else {
 309                 if (!old.user_alloc && old.rmap) {
 310                         int ret;
 311
 312                         down_write(&current->mm->mmap_sem);
 313                         ret = do_munmap(current->mm, old.userspace_addr,
 314                                         old.npages * PAGE_SIZE);
 315                         up_write(&current->mm->mmap_sem);
 316                         if (ret < 0)
 317                                 printk(KERN_WARNING
 318                                        "kvm_vm_ioctl_set_memory_region: "
 319                                        "failed to munmap memory\n");
 320                 }
 321         }
 322
 323         /* Allocate page dirty bitmap if needed */
 324         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 325                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 326
 327                 new.dirty_bitmap = vmalloc(dirty_bytes);
 328                 if (!new.dirty_bitmap)
 329                         goto out_free;
 330                 memset(new.dirty_bitmap, 0, dirty_bytes);
 331         }
 332
 333         if (mem->slot >= kvm->nmemslots)
 334                 kvm->nmemslots = mem->slot + 1;
 335
 336         if (!kvm->n_requested_mmu_pages) {
 337                 unsigned int n_pages;
 338
 339                 if (npages) {
 340                         n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000;
 341                         kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages +
 342                                                  n_pages);
 343                 } else {
 344                         unsigned int nr_mmu_pages;
 345
 346                         n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000;
 347                         nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
 348                         nr_mmu_pages = max(nr_mmu_pages,
 349                                         (unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
 350                         kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
 351                 }
 352         }
 353
 354         *memslot = new;
 355
 356         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
 357         kvm_flush_remote_tlbs(kvm);
 358
 359         kvm_free_physmem_slot(&old, &new);
 360         return 0;
 361
 362 out_free:
 363         kvm_free_physmem_slot(&new, &old);
 364 out:
 365         return r;
 366
 367 }
 368 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 369
 370 int kvm_set_memory_region(struct kvm *kvm,
 371                           struct kvm_userspace_memory_region *mem,
 372                           int user_alloc)
 373 {
 374         int r;
 375
 376         mutex_lock(&kvm->lock);
 377         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 378         mutex_unlock(&kvm->lock);
 379         return r;
 380 }
 381 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 382
 383 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 384                                    struct
 385                                    kvm_userspace_memory_region *mem,
 386                                    int user_alloc)
 387 {
 388         if (mem->slot >= KVM_MEMORY_SLOTS)
 389                 return -EINVAL;
 390         return kvm_set_memory_region(kvm, mem, user_alloc);
 391 }
 392
 393 int kvm_get_dirty_log(struct kvm *kvm,
 394                         struct kvm_dirty_log *log, int *is_dirty)
 395 {
 396         struct kvm_memory_slot *memslot;
 397         int r, i;
 398         int n;
 399         unsigned long any = 0;
 400
 401         r = -EINVAL;
 402         if (log->slot >= KVM_MEMORY_SLOTS)
 403                 goto out;
 404
 405         memslot = &kvm->memslots[log->slot];
 406         r = -ENOENT;
 407         if (!memslot->dirty_bitmap)
 408                 goto out;
 409
 410         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 411
 412         for (i = 0; !any && i < n/sizeof(long); ++i)
 413                 any = memslot->dirty_bitmap[i];
 414
 415         r = -EFAULT;
 416         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 417                 goto out;
 418
 419         if (any)
 420                 *is_dirty = 1;
 421
 422         r = 0;
 423 out:
 424         return r;
 425 }
 426
 427 int is_error_page(struct page *page)
 428 {
 429         return page == bad_page;
 430 }
 431 EXPORT_SYMBOL_GPL(is_error_page);
 432
 433 static inline unsigned long bad_hva(void)
 434 {
 435         return PAGE_OFFSET;
 436 }
 437
 438 int kvm_is_error_hva(unsigned long addr)
 439 {
 440         return addr == bad_hva();
 441 }
 442 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 443
 444 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 445 {
 446         int i;
 447         struct kvm_mem_alias *alias;
 448
 449         for (i = 0; i < kvm->naliases; ++i) {
 450                 alias = &kvm->aliases[i];
 451                 if (gfn >= alias->base_gfn
 452                     && gfn < alias->base_gfn + alias->npages)
 453                         return alias->target_gfn + gfn - alias->base_gfn;
 454         }
 455         return gfn;
 456 }
 457
 458 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 459 {
 460         int i;
 461
 462         for (i = 0; i < kvm->nmemslots; ++i) {
 463                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 464
 465                 if (gfn >= memslot->base_gfn
 466                     && gfn < memslot->base_gfn + memslot->npages)
 467                         return memslot;
 468         }
 469         return NULL;
 470 }
 471
 472 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 473 {
 474         gfn = unalias_gfn(kvm, gfn);
 475         return __gfn_to_memslot(kvm, gfn);
 476 }
 477
 478 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 479 {
 480         int i;
 481
 482         gfn = unalias_gfn(kvm, gfn);
 483         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 484                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 485
 486                 if (gfn >= memslot->base_gfn
 487                     && gfn < memslot->base_gfn + memslot->npages)
 488                         return 1;
 489         }
 490         return 0;
 491 }
 492 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 493
 494 static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 495 {
 496         struct kvm_memory_slot *slot;
 497
 498         gfn = unalias_gfn(kvm, gfn);
 499         slot = __gfn_to_memslot(kvm, gfn);
 500         if (!slot)
 501                 return bad_hva();
 502         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 503 }
 504
 505 /*
 506  * Requires current->mm->mmap_sem to be held
 507  */
 508 static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
 509 {
 510         struct page *page[1];
 511         unsigned long addr;
 512         int npages;
 513
 514         might_sleep();
 515
 516         addr = gfn_to_hva(kvm, gfn);
 517         if (kvm_is_error_hva(addr)) {
 518                 get_page(bad_page);
 519                 return bad_page;
 520         }
 521
 522         npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
 523                                 NULL);
 524
 525         if (npages != 1) {
 526                 get_page(bad_page);
 527                 return bad_page;
 528         }
 529
 530         return page[0];
 531 }
 532
 533 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 534 {
 535         struct page *page;
 536
 537         down_read(&current->mm->mmap_sem);
 538         page = __gfn_to_page(kvm, gfn);
 539         up_read(&current->mm->mmap_sem);
 540
 541         return page;
 542 }
 543
 544 EXPORT_SYMBOL_GPL(gfn_to_page);
 545
 546 void kvm_release_page(struct page *page)
 547 {
 548         if (!PageReserved(page))
 549                 SetPageDirty(page);
 550         put_page(page);
 551 }
 552 EXPORT_SYMBOL_GPL(kvm_release_page);
 553
 554 static int next_segment(unsigned long len, int offset)
 555 {
 556         if (len > PAGE_SIZE - offset)
 557                 return PAGE_SIZE - offset;
 558         else
 559                 return len;
 560 }
 561
 562 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 563                         int len)
 564 {
 565         int r;
 566         unsigned long addr;
 567
 568         addr = gfn_to_hva(kvm, gfn);
 569         if (kvm_is_error_hva(addr))
 570                 return -EFAULT;
 571         r = copy_from_user(data, (void __user *)addr + offset, len);
 572         if (r)
 573                 return -EFAULT;
 574         return 0;
 575 }
 576 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
 577
 578 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
 579 {
 580         gfn_t gfn = gpa >> PAGE_SHIFT;
 581         int seg;
 582         int offset = offset_in_page(gpa);
 583         int ret;
 584
 585         while ((seg = next_segment(len, offset)) != 0) {
 586                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
 587                 if (ret < 0)
 588                         return ret;
 589                 offset = 0;
 590                 len -= seg;
 591                 data += seg;
 592                 ++gfn;
 593         }
 594         return 0;
 595 }
 596 EXPORT_SYMBOL_GPL(kvm_read_guest);
 597
 598 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 599                          int offset, int len)
 600 {
 601         int r;
 602         unsigned long addr;
 603
 604         addr = gfn_to_hva(kvm, gfn);
 605         if (kvm_is_error_hva(addr))
 606                 return -EFAULT;
 607         r = copy_to_user((void __user *)addr + offset, data, len);
 608         if (r)
 609                 return -EFAULT;
 610         mark_page_dirty(kvm, gfn);
 611         return 0;
 612 }
 613 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
 614
 615 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 616                     unsigned long len)
 617 {
 618         gfn_t gfn = gpa >> PAGE_SHIFT;
 619         int seg;
 620         int offset = offset_in_page(gpa);
 621         int ret;
 622
 623         while ((seg = next_segment(len, offset)) != 0) {
 624                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
 625                 if (ret < 0)
 626                         return ret;
 627                 offset = 0;
 628                 len -= seg;
 629                 data += seg;
 630                 ++gfn;
 631         }
 632         return 0;
 633 }
 634
 635 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 636 {
 637         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
 638 }
 639 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
 640
 641 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
 642 {
 643         gfn_t gfn = gpa >> PAGE_SHIFT;
 644         int seg;
 645         int offset = offset_in_page(gpa);
 646         int ret;
 647
 648         while ((seg = next_segment(len, offset)) != 0) {
 649                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
 650                 if (ret < 0)
 651                         return ret;
 652                 offset = 0;
 653                 len -= seg;
 654                 ++gfn;
 655         }
 656         return 0;
 657 }
 658 EXPORT_SYMBOL_GPL(kvm_clear_guest);
 659
 660 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 661 {
 662         struct kvm_memory_slot *memslot;
 663
 664         gfn = unalias_gfn(kvm, gfn);
 665         memslot = __gfn_to_memslot(kvm, gfn);
 666         if (memslot && memslot->dirty_bitmap) {
 667                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 668
 669                 /* avoid RMW */
 670                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 671                         set_bit(rel_gfn, memslot->dirty_bitmap);
 672         }
 673 }
 674
 675 /*
 676  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
 677  */
 678 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 679 {
 680         DECLARE_WAITQUEUE(wait, current);
 681
 682         add_wait_queue(&vcpu->wq, &wait);
 683
 684         /*
 685          * We will block until either an interrupt or a signal wakes us up
 686          */
 687         while (!kvm_cpu_has_interrupt(vcpu)
 688                && !signal_pending(current)
 689                && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
 690                && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
 691                 set_current_state(TASK_INTERRUPTIBLE);
 692                 vcpu_put(vcpu);
 693                 schedule();
 694                 vcpu_load(vcpu);
 695         }
 696
 697         __set_current_state(TASK_RUNNING);
 698         remove_wait_queue(&vcpu->wq, &wait);
 699 }
 700
 701 void kvm_resched(struct kvm_vcpu *vcpu)
 702 {
 703         if (!need_resched())
 704                 return;
 705         cond_resched();
 706 }
 707 EXPORT_SYMBOL_GPL(kvm_resched);
 708
 709 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 710                                     struct kvm_interrupt *irq)
 711 {
 712         if (irq->irq < 0 || irq->irq >= 256)
 713                 return -EINVAL;
 714         if (irqchip_in_kernel(vcpu->kvm))
 715                 return -ENXIO;
 716         vcpu_load(vcpu);
 717
 718         set_bit(irq->irq, vcpu->irq_pending);
 719         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
 720
 721         vcpu_put(vcpu);
 722
 723         return 0;
 724 }
 725
 726 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
 727                                     unsigned long address,
 728                                     int *type)
 729 {
 730         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
 731         unsigned long pgoff;
 732         struct page *page;
 733
 734         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 735         if (pgoff == 0)
 736                 page = virt_to_page(vcpu->run);
 737         else if (pgoff == KVM_PIO_PAGE_OFFSET)
 738                 page = virt_to_page(vcpu->pio_data);
 739         else
 740                 return NOPAGE_SIGBUS;
 741         get_page(page);
 742         if (type != NULL)
 743                 *type = VM_FAULT_MINOR;
 744
 745         return page;
 746 }
 747
 748 static struct vm_operations_struct kvm_vcpu_vm_ops = {
 749         .nopage = kvm_vcpu_nopage,
 750 };
 751
 752 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
 753 {
 754         vma->vm_ops = &kvm_vcpu_vm_ops;
 755         return 0;
 756 }
 757
 758 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
 759 {
 760         struct kvm_vcpu *vcpu = filp->private_data;
 761
 762         fput(vcpu->kvm->filp);
 763         return 0;
 764 }
 765
 766 static struct file_operations kvm_vcpu_fops = {
 767         .release        = kvm_vcpu_release,
 768         .unlocked_ioctl = kvm_vcpu_ioctl,
 769         .compat_ioctl   = kvm_vcpu_ioctl,
 770         .mmap           = kvm_vcpu_mmap,
 771 };
 772
 773 /*
 774  * Allocates an inode for the vcpu.
 775  */
 776 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 777 {
 778         int fd, r;
 779         struct inode *inode;
 780         struct file *file;
 781
 782         r = anon_inode_getfd(&fd, &inode, &file,
 783                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
 784         if (r)
 785                 return r;
 786         atomic_inc(&vcpu->kvm->filp->f_count);
 787         return fd;
 788 }
 789
 790 /*
 791  * Creates some virtual cpus.  Good luck creating more than one.
 792  */
 793 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 794 {
 795         int r;
 796         struct kvm_vcpu *vcpu;
 797
 798         if (!valid_vcpu(n))
 799                 return -EINVAL;
 800
 801         vcpu = kvm_arch_vcpu_create(kvm, n);
 802         if (IS_ERR(vcpu))
 803                 return PTR_ERR(vcpu);
 804
 805         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 806
 807         mutex_lock(&kvm->lock);
 808         if (kvm->vcpus[n]) {
 809                 r = -EEXIST;
 810                 mutex_unlock(&kvm->lock);
 811                 goto vcpu_destroy;
 812         }
 813         kvm->vcpus[n] = vcpu;
 814         mutex_unlock(&kvm->lock);
 815
 816         /* Now it's all set up, let userspace reach it */
 817         r = create_vcpu_fd(vcpu);
 818         if (r < 0)
 819                 goto unlink;
 820         return r;
 821
 822 unlink:
 823         mutex_lock(&kvm->lock);
 824         kvm->vcpus[n] = NULL;
 825         mutex_unlock(&kvm->lock);
 826 vcpu_destroy:
 827         kvm_arch_vcpu_destroy(vcpu);
 828         return r;
 829 }
 830
 831 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 832 {
 833         if (sigset) {
 834                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 835                 vcpu->sigset_active = 1;
 836                 vcpu->sigset = *sigset;
 837         } else
 838                 vcpu->sigset_active = 0;
 839         return 0;
 840 }
 841
 842 static long kvm_vcpu_ioctl(struct file *filp,
 843                            unsigned int ioctl, unsigned long arg)
 844 {
 845         struct kvm_vcpu *vcpu = filp->private_data;
 846         void __user *argp = (void __user *)arg;
 847         int r;
 848
 849         switch (ioctl) {
 850         case KVM_RUN:
 851                 r = -EINVAL;
 852                 if (arg)
 853                         goto out;
 854                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
 855                 break;
 856         case KVM_GET_REGS: {
 857                 struct kvm_regs kvm_regs;
 858
 859                 memset(&kvm_regs, 0, sizeof kvm_regs);
 860                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
 861                 if (r)
 862                         goto out;
 863                 r = -EFAULT;
 864                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
 865                         goto out;
 866                 r = 0;
 867                 break;
 868         }
 869         case KVM_SET_REGS: {
 870                 struct kvm_regs kvm_regs;
 871
 872                 r = -EFAULT;
 873                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
 874                         goto out;
 875                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
 876                 if (r)
 877                         goto out;
 878                 r = 0;
 879                 break;
 880         }
 881         case KVM_GET_SREGS: {
 882                 struct kvm_sregs kvm_sregs;
 883
 884                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
 885                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
 886                 if (r)
 887                         goto out;
 888                 r = -EFAULT;
 889                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
 890                         goto out;
 891                 r = 0;
 892                 break;
 893         }
 894         case KVM_SET_SREGS: {
 895                 struct kvm_sregs kvm_sregs;
 896
 897                 r = -EFAULT;
 898                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
 899                         goto out;
 900                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
 901                 if (r)
 902                         goto out;
 903                 r = 0;
 904                 break;
 905         }
 906         case KVM_TRANSLATE: {
 907                 struct kvm_translation tr;
 908
 909                 r = -EFAULT;
 910                 if (copy_from_user(&tr, argp, sizeof tr))
 911                         goto out;
 912                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
 913                 if (r)
 914                         goto out;
 915                 r = -EFAULT;
 916                 if (copy_to_user(argp, &tr, sizeof tr))
 917                         goto out;
 918                 r = 0;
 919                 break;
 920         }
 921         case KVM_INTERRUPT: {
 922                 struct kvm_interrupt irq;
 923
 924                 r = -EFAULT;
 925                 if (copy_from_user(&irq, argp, sizeof irq))
 926                         goto out;
 927                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 928                 if (r)
 929                         goto out;
 930                 r = 0;
 931                 break;
 932         }
 933         case KVM_DEBUG_GUEST: {
 934                 struct kvm_debug_guest dbg;
 935
 936                 r = -EFAULT;
 937                 if (copy_from_user(&dbg, argp, sizeof dbg))
 938                         goto out;
 939                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
 940                 if (r)
 941                         goto out;
 942                 r = 0;
 943                 break;
 944         }
 945         case KVM_SET_SIGNAL_MASK: {
 946                 struct kvm_signal_mask __user *sigmask_arg = argp;
 947                 struct kvm_signal_mask kvm_sigmask;
 948                 sigset_t sigset, *p;
 949
 950                 p = NULL;
 951                 if (argp) {
 952                         r = -EFAULT;
 953                         if (copy_from_user(&kvm_sigmask, argp,
 954                                            sizeof kvm_sigmask))
 955                                 goto out;
 956                         r = -EINVAL;
 957                         if (kvm_sigmask.len != sizeof sigset)
 958                                 goto out;
 959                         r = -EFAULT;
 960                         if (copy_from_user(&sigset, sigmask_arg->sigset,
 961                                            sizeof sigset))
 962                                 goto out;
 963                         p = &sigset;
 964                 }
 965                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
 966                 break;
 967         }
 968         case KVM_GET_FPU: {
 969                 struct kvm_fpu fpu;
 970
 971                 memset(&fpu, 0, sizeof fpu);
 972                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
 973                 if (r)
 974                         goto out;
 975                 r = -EFAULT;
 976                 if (copy_to_user(argp, &fpu, sizeof fpu))
 977                         goto out;
 978                 r = 0;
 979                 break;
 980         }
 981         case KVM_SET_FPU: {
 982                 struct kvm_fpu fpu;
 983
 984                 r = -EFAULT;
 985                 if (copy_from_user(&fpu, argp, sizeof fpu))
 986                         goto out;
 987                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
 988                 if (r)
 989                         goto out;
 990                 r = 0;
 991                 break;
 992         }
 993         default:
 994                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 995         }
 996 out:
 997         return r;
 998 }
 999
1000 static long kvm_vm_ioctl(struct file *filp,
1001                            unsigned int ioctl, unsigned long arg)
1002 {
1003         struct kvm *kvm = filp->private_data;
1004         void __user *argp = (void __user *)arg;
1005         int r;
1006
1007         switch (ioctl) {
1008         case KVM_CREATE_VCPU:
1009                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1010                 if (r < 0)
1011                         goto out;
1012                 break;
1013         case KVM_SET_USER_MEMORY_REGION: {
1014                 struct kvm_userspace_memory_region kvm_userspace_mem;
1015
1016                 r = -EFAULT;
1017                 if (copy_from_user(&kvm_userspace_mem, argp,
1018                                                 sizeof kvm_userspace_mem))
1019                         goto out;
1020
1021                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1022                 if (r)
1023                         goto out;
1024                 break;
1025         }
1026         case KVM_GET_DIRTY_LOG: {
1027                 struct kvm_dirty_log log;
1028
1029                 r = -EFAULT;
1030                 if (copy_from_user(&log, argp, sizeof log))
1031                         goto out;
1032                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1033                 if (r)
1034                         goto out;
1035                 break;
1036         }
1037         default:
1038                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1039         }
1040 out:
1041         return r;
1042 }
1043
1044 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
1045                                   unsigned long address,
1046                                   int *type)
1047 {
1048         struct kvm *kvm = vma->vm_file->private_data;
1049         unsigned long pgoff;
1050         struct page *page;
1051
1052         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1053         if (!kvm_is_visible_gfn(kvm, pgoff))
1054                 return NOPAGE_SIGBUS;
1055         /* current->mm->mmap_sem is already held so call lockless version */
1056         page = __gfn_to_page(kvm, pgoff);
1057         if (is_error_page(page)) {
1058                 kvm_release_page(page);
1059                 return NOPAGE_SIGBUS;
1060         }
1061         if (type != NULL)
1062                 *type = VM_FAULT_MINOR;
1063
1064         return page;
1065 }
1066
1067 static struct vm_operations_struct kvm_vm_vm_ops = {
1068         .nopage = kvm_vm_nopage,
1069 };
1070
1071 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1072 {
1073         vma->vm_ops = &kvm_vm_vm_ops;
1074         return 0;
1075 }
1076
1077 static struct file_operations kvm_vm_fops = {
1078         .release        = kvm_vm_release,
1079         .unlocked_ioctl = kvm_vm_ioctl,
1080         .compat_ioctl   = kvm_vm_ioctl,
1081         .mmap           = kvm_vm_mmap,
1082 };
1083
1084 static int kvm_dev_ioctl_create_vm(void)
1085 {
1086         int fd, r;
1087         struct inode *inode;
1088         struct file *file;
1089         struct kvm *kvm;
1090
1091         kvm = kvm_create_vm();
1092         if (IS_ERR(kvm))
1093                 return PTR_ERR(kvm);
1094         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1095         if (r) {
1096                 kvm_destroy_vm(kvm);
1097                 return r;
1098         }
1099
1100         kvm->filp = file;
1101
1102         return fd;
1103 }
1104
1105 static long kvm_dev_ioctl(struct file *filp,
1106                           unsigned int ioctl, unsigned long arg)
1107 {
1108         void __user *argp = (void __user *)arg;
1109         long r = -EINVAL;
1110
1111         switch (ioctl) {
1112         case KVM_GET_API_VERSION:
1113                 r = -EINVAL;
1114                 if (arg)
1115                         goto out;
1116                 r = KVM_API_VERSION;
1117                 break;
1118         case KVM_CREATE_VM:
1119                 r = -EINVAL;
1120                 if (arg)
1121                         goto out;
1122                 r = kvm_dev_ioctl_create_vm();
1123                 break;
1124         case KVM_CHECK_EXTENSION:
1125                 r = kvm_dev_ioctl_check_extension((long)argp);
1126                 break;
1127         case KVM_GET_VCPU_MMAP_SIZE:
1128                 r = -EINVAL;
1129                 if (arg)
1130                         goto out;
1131                 r = 2 * PAGE_SIZE;
1132                 break;
1133         default:
1134                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1135         }
1136 out:
1137         return r;
1138 }
1139
1140 static struct file_operations kvm_chardev_ops = {
1141         .unlocked_ioctl = kvm_dev_ioctl,
1142         .compat_ioctl   = kvm_dev_ioctl,
1143 };
1144
1145 static struct miscdevice kvm_dev = {
1146         KVM_MINOR,
1147         "kvm",
1148         &kvm_chardev_ops,
1149 };
1150
1151 static void hardware_enable(void *junk)
1152 {
1153         int cpu = raw_smp_processor_id();
1154
1155         if (cpu_isset(cpu, cpus_hardware_enabled))
1156                 return;
1157         cpu_set(cpu, cpus_hardware_enabled);
1158         kvm_arch_hardware_enable(NULL);
1159 }
1160
1161 static void hardware_disable(void *junk)
1162 {
1163         int cpu = raw_smp_processor_id();
1164
1165         if (!cpu_isset(cpu, cpus_hardware_enabled))
1166                 return;
1167         cpu_clear(cpu, cpus_hardware_enabled);
1168         decache_vcpus_on_cpu(cpu);
1169         kvm_arch_hardware_disable(NULL);
1170 }
1171
1172 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1173                            void *v)
1174 {
1175         int cpu = (long)v;
1176
1177         val &= ~CPU_TASKS_FROZEN;
1178         switch (val) {
1179         case CPU_DYING:
1180                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1181                        cpu);
1182                 hardware_disable(NULL);
1183                 break;
1184         case CPU_UP_CANCELED:
1185                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1186                        cpu);
1187                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
1188                 break;
1189         case CPU_ONLINE:
1190                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1191                        cpu);
1192                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
1193                 break;
1194         }
1195         return NOTIFY_OK;
1196 }
1197
1198 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1199                       void *v)
1200 {
1201         if (val == SYS_RESTART) {
1202                 /*
1203                  * Some (well, at least mine) BIOSes hang on reboot if
1204                  * in vmx root mode.
1205                  */
1206                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1207                 on_each_cpu(hardware_disable, NULL, 0, 1);
1208         }
1209         return NOTIFY_OK;
1210 }
1211
1212 static struct notifier_block kvm_reboot_notifier = {
1213         .notifier_call = kvm_reboot,
1214         .priority = 0,
1215 };
1216
1217 void kvm_io_bus_init(struct kvm_io_bus *bus)
1218 {
1219         memset(bus, 0, sizeof(*bus));
1220 }
1221
1222 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1223 {
1224         int i;
1225
1226         for (i = 0; i < bus->dev_count; i++) {
1227                 struct kvm_io_device *pos = bus->devs[i];
1228
1229                 kvm_iodevice_destructor(pos);
1230         }
1231 }
1232
1233 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
1234 {
1235         int i;
1236
1237         for (i = 0; i < bus->dev_count; i++) {
1238                 struct kvm_io_device *pos = bus->devs[i];
1239
1240                 if (pos->in_range(pos, addr))
1241                         return pos;
1242         }
1243
1244         return NULL;
1245 }
1246
1247 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1248 {
1249         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1250
1251         bus->devs[bus->dev_count++] = dev;
1252 }
1253
1254 static struct notifier_block kvm_cpu_notifier = {
1255         .notifier_call = kvm_cpu_hotplug,
1256         .priority = 20, /* must be > scheduler priority */
1257 };
1258
1259 static u64 vm_stat_get(void *_offset)
1260 {
1261         unsigned offset = (long)_offset;
1262         u64 total = 0;
1263         struct kvm *kvm;
1264
1265         spin_lock(&kvm_lock);
1266         list_for_each_entry(kvm, &vm_list, vm_list)
1267                 total += *(u32 *)((void *)kvm + offset);
1268         spin_unlock(&kvm_lock);
1269         return total;
1270 }
1271
1272 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1273
1274 static u64 vcpu_stat_get(void *_offset)
1275 {
1276         unsigned offset = (long)_offset;
1277         u64 total = 0;
1278         struct kvm *kvm;
1279         struct kvm_vcpu *vcpu;
1280         int i;
1281
1282         spin_lock(&kvm_lock);
1283         list_for_each_entry(kvm, &vm_list, vm_list)
1284                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1285                         vcpu = kvm->vcpus[i];
1286                         if (vcpu)
1287                                 total += *(u32 *)((void *)vcpu + offset);
1288                 }
1289         spin_unlock(&kvm_lock);
1290         return total;
1291 }
1292
1293 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1294
1295 static struct file_operations *stat_fops[] = {
1296         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1297         [KVM_STAT_VM]   = &vm_stat_fops,
1298 };
1299
1300 static void kvm_init_debug(void)
1301 {
1302         struct kvm_stats_debugfs_item *p;
1303
1304         debugfs_dir = debugfs_create_dir("kvm", NULL);
1305         for (p = debugfs_entries; p->name; ++p)
1306                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
1307                                                 (void *)(long)p->offset,
1308                                                 stat_fops[p->kind]);
1309 }
1310
1311 static void kvm_exit_debug(void)
1312 {
1313         struct kvm_stats_debugfs_item *p;
1314
1315         for (p = debugfs_entries; p->name; ++p)
1316                 debugfs_remove(p->dentry);
1317         debugfs_remove(debugfs_dir);
1318 }
1319
1320 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1321 {
1322         hardware_disable(NULL);
1323         return 0;
1324 }
1325
1326 static int kvm_resume(struct sys_device *dev)
1327 {
1328         hardware_enable(NULL);
1329         return 0;
1330 }
1331
1332 static struct sysdev_class kvm_sysdev_class = {
1333         .name = "kvm",
1334         .suspend = kvm_suspend,
1335         .resume = kvm_resume,
1336 };
1337
1338 static struct sys_device kvm_sysdev = {
1339         .id = 0,
1340         .cls = &kvm_sysdev_class,
1341 };
1342
1343 struct page *bad_page;
1344
1345 static inline
1346 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1347 {
1348         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1349 }
1350
1351 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1352 {
1353         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1354
1355         kvm_arch_vcpu_load(vcpu, cpu);
1356 }
1357
1358 static void kvm_sched_out(struct preempt_notifier *pn,
1359                           struct task_struct *next)
1360 {
1361         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1362
1363         kvm_arch_vcpu_put(vcpu);
1364 }
1365
1366 int kvm_init(void *opaque, unsigned int vcpu_size,
1367                   struct module *module)
1368 {
1369         int r;
1370         int cpu;
1371
1372         kvm_init_debug();
1373
1374         r = kvm_arch_init(opaque);
1375         if (r)
1376                 goto out4;
1377
1378         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1379
1380         if (bad_page == NULL) {
1381                 r = -ENOMEM;
1382                 goto out;
1383         }
1384
1385         r = kvm_arch_hardware_setup();
1386         if (r < 0)
1387                 goto out;
1388
1389         for_each_online_cpu(cpu) {
1390                 smp_call_function_single(cpu,
1391                                 kvm_arch_check_processor_compat,
1392                                 &r, 0, 1);
1393                 if (r < 0)
1394                         goto out_free_0;
1395         }
1396
1397         on_each_cpu(hardware_enable, NULL, 0, 1);
1398         r = register_cpu_notifier(&kvm_cpu_notifier);
1399         if (r)
1400                 goto out_free_1;
1401         register_reboot_notifier(&kvm_reboot_notifier);
1402
1403         r = sysdev_class_register(&kvm_sysdev_class);
1404         if (r)
1405                 goto out_free_2;
1406
1407         r = sysdev_register(&kvm_sysdev);
1408         if (r)
1409                 goto out_free_3;
1410
1411         /* A kmem cache lets us meet the alignment requirements of fx_save. */
1412         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1413                                            __alignof__(struct kvm_vcpu),
1414                                            0, NULL);
1415         if (!kvm_vcpu_cache) {
1416                 r = -ENOMEM;
1417                 goto out_free_4;
1418         }
1419
1420         kvm_chardev_ops.owner = module;
1421
1422         r = misc_register(&kvm_dev);
1423         if (r) {
1424                 printk(KERN_ERR "kvm: misc device register failed\n");
1425                 goto out_free;
1426         }
1427
1428         kvm_preempt_ops.sched_in = kvm_sched_in;
1429         kvm_preempt_ops.sched_out = kvm_sched_out;
1430
1431         return 0;
1432
1433 out_free:
1434         kmem_cache_destroy(kvm_vcpu_cache);
1435 out_free_4:
1436         sysdev_unregister(&kvm_sysdev);
1437 out_free_3:
1438         sysdev_class_unregister(&kvm_sysdev_class);
1439 out_free_2:
1440         unregister_reboot_notifier(&kvm_reboot_notifier);
1441         unregister_cpu_notifier(&kvm_cpu_notifier);
1442 out_free_1:
1443         on_each_cpu(hardware_disable, NULL, 0, 1);
1444 out_free_0:
1445         kvm_arch_hardware_unsetup();
1446 out:
1447         kvm_arch_exit();
1448         kvm_exit_debug();
1449 out4:
1450         return r;
1451 }
1452 EXPORT_SYMBOL_GPL(kvm_init);
1453
1454 void kvm_exit(void)
1455 {
1456         misc_deregister(&kvm_dev);
1457         kmem_cache_destroy(kvm_vcpu_cache);
1458         sysdev_unregister(&kvm_sysdev);
1459         sysdev_class_unregister(&kvm_sysdev_class);
1460         unregister_reboot_notifier(&kvm_reboot_notifier);
1461         unregister_cpu_notifier(&kvm_cpu_notifier);
1462         on_each_cpu(hardware_disable, NULL, 0, 1);
1463         kvm_arch_hardware_unsetup();
1464         kvm_arch_exit();
1465         kvm_exit_debug();
1466         __free_page(bad_page);
1467 }
1468 EXPORT_SYMBOL_GPL(kvm_exit);