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  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Avi Kivity   <avi@qumranet.com>
  12  *   Yaniv Kamay  <yaniv@qumranet.com>
  13  *
  14  * This work is licensed under the terms of the GNU GPL, version 2.  See
  15  * the COPYING file in the top-level directory.
  16  *
  17  */
  18
  19 #include "iodev.h"
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kvm.h>
  23 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/percpu.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/syscore_ops.h>
  34 #include <linux/cpu.h>
  35 #include <linux/sched.h>
  36 #include <linux/cpumask.h>
  37 #include <linux/smp.h>
  38 #include <linux/anon_inodes.h>
  39 #include <linux/profile.h>
  40 #include <linux/kvm_para.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/mman.h>
  43 #include <linux/swap.h>
  44 #include <linux/bitops.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/compat.h>
  47 #include <linux/srcu.h>
  48 #include <linux/hugetlb.h>
  49 #include <linux/slab.h>
  50 #include <linux/sort.h>
  51 #include <linux/bsearch.h>
  52
  53 #include <asm/processor.h>
  54 #include <asm/io.h>
  55 #include <asm/uaccess.h>
  56 #include <asm/pgtable.h>
  57
  58 #include "coalesced_mmio.h"
  59 #include "async_pf.h"
  60
  61 #define CREATE_TRACE_POINTS
  62 #include <trace/events/kvm.h>
  63
  64 MODULE_AUTHOR("Qumranet");
  65 MODULE_LICENSE("GPL");
  66
  67 /*
  68  * Ordering of locks:
  69  *
  70  *              kvm->lock --> kvm->slots_lock --> kvm->irq_lock
  71  */
  72
  73 DEFINE_RAW_SPINLOCK(kvm_lock);
  74 LIST_HEAD(vm_list);
  75
  76 static cpumask_var_t cpus_hardware_enabled;
  77 static int kvm_usage_count = 0;
  78 static atomic_t hardware_enable_failed;
  79
  80 struct kmem_cache *kvm_vcpu_cache;
  81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  82
  83 static __read_mostly struct preempt_ops kvm_preempt_ops;
  84
  85 struct dentry *kvm_debugfs_dir;
  86
  87 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  88                            unsigned long arg);
  89 #ifdef CONFIG_COMPAT
  90 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
  91                                   unsigned long arg);
  92 #endif
  93 static int hardware_enable_all(void);
  94 static void hardware_disable_all(void);
  95
  96 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
  97
  98 bool kvm_rebooting;
  99 EXPORT_SYMBOL_GPL(kvm_rebooting);
 100
 101 static bool largepages_enabled = true;
 102
 103 static struct page *hwpoison_page;
 104 static pfn_t hwpoison_pfn;
 105
 106 struct page *fault_page;
 107 pfn_t fault_pfn;
 108
 109 inline int kvm_is_mmio_pfn(pfn_t pfn)
 110 {
 111         if (pfn_valid(pfn)) {
 112                 int reserved;
 113                 struct page *tail = pfn_to_page(pfn);
 114                 struct page *head = compound_trans_head(tail);
 115                 reserved = PageReserved(head);
 116                 if (head != tail) {
 117                         /*
 118                          * "head" is not a dangling pointer
 119                          * (compound_trans_head takes care of that)
 120                          * but the hugepage may have been splitted
 121                          * from under us (and we may not hold a
 122                          * reference count on the head page so it can
 123                          * be reused before we run PageReferenced), so
 124                          * we've to check PageTail before returning
 125                          * what we just read.
 126                          */
 127                         smp_rmb();
 128                         if (PageTail(tail))
 129                                 return reserved;
 130                 }
 131                 return PageReserved(tail);
 132         }
 133
 134         return true;
 135 }
 136
 137 /*
 138  * Switches to specified vcpu, until a matching vcpu_put()
 139  */
 140 void vcpu_load(struct kvm_vcpu *vcpu)
 141 {
 142         int cpu;
 143
 144         mutex_lock(&vcpu->mutex);
 145         if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
 146                 /* The thread running this VCPU changed. */
 147                 struct pid *oldpid = vcpu->pid;
 148                 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
 149                 rcu_assign_pointer(vcpu->pid, newpid);
 150                 synchronize_rcu();
 151                 put_pid(oldpid);
 152         }
 153         cpu = get_cpu();
 154         preempt_notifier_register(&vcpu->preempt_notifier);
 155         kvm_arch_vcpu_load(vcpu, cpu);
 156         put_cpu();
 157 }
 158
 159 void vcpu_put(struct kvm_vcpu *vcpu)
 160 {
 161         preempt_disable();
 162         kvm_arch_vcpu_put(vcpu);
 163         preempt_notifier_unregister(&vcpu->preempt_notifier);
 164         preempt_enable();
 165         mutex_unlock(&vcpu->mutex);
 166 }
 167
 168 static void ack_flush(void *_completed)
 169 {
 170 }
 171
 172 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 173 {
 174         int i, cpu, me;
 175         cpumask_var_t cpus;
 176         bool called = true;
 177         struct kvm_vcpu *vcpu;
 178
 179         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
 180
 181         me = get_cpu();
 182         kvm_for_each_vcpu(i, vcpu, kvm) {
 183                 kvm_make_request(req, vcpu);
 184                 cpu = vcpu->cpu;
 185
 186                 /* Set ->requests bit before we read ->mode */
 187                 smp_mb();
 188
 189                 if (cpus != NULL && cpu != -1 && cpu != me &&
 190                       kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
 191                         cpumask_set_cpu(cpu, cpus);
 192         }
 193         if (unlikely(cpus == NULL))
 194                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
 195         else if (!cpumask_empty(cpus))
 196                 smp_call_function_many(cpus, ack_flush, NULL, 1);
 197         else
 198                 called = false;
 199         put_cpu();
 200         free_cpumask_var(cpus);
 201         return called;
 202 }
 203
 204 void kvm_flush_remote_tlbs(struct kvm *kvm)
 205 {
 206         int dirty_count = kvm->tlbs_dirty;
 207
 208         smp_mb();
 209         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 210                 ++kvm->stat.remote_tlb_flush;
 211         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 212 }
 213
 214 void kvm_reload_remote_mmus(struct kvm *kvm)
 215 {
 216         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 217 }
 218
 219 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 220 {
 221         struct page *page;
 222         int r;
 223
 224         mutex_init(&vcpu->mutex);
 225         vcpu->cpu = -1;
 226         vcpu->kvm = kvm;
 227         vcpu->vcpu_id = id;
 228         vcpu->pid = NULL;
 229         init_waitqueue_head(&vcpu->wq);
 230         kvm_async_pf_vcpu_init(vcpu);
 231
 232         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 233         if (!page) {
 234                 r = -ENOMEM;
 235                 goto fail;
 236         }
 237         vcpu->run = page_address(page);
 238
 239         r = kvm_arch_vcpu_init(vcpu);
 240         if (r < 0)
 241                 goto fail_free_run;
 242         return 0;
 243
 244 fail_free_run:
 245         free_page((unsigned long)vcpu->run);
 246 fail:
 247         return r;
 248 }
 249 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 250
 251 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 252 {
 253         put_pid(vcpu->pid);
 254         kvm_arch_vcpu_uninit(vcpu);
 255         free_page((unsigned long)vcpu->run);
 256 }
 257 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 258
 259 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 260 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 261 {
 262         return container_of(mn, struct kvm, mmu_notifier);
 263 }
 264
 265 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 266                                              struct mm_struct *mm,
 267                                              unsigned long address)
 268 {
 269         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 270         int need_tlb_flush, idx;
 271
 272         /*
 273          * When ->invalidate_page runs, the linux pte has been zapped
 274          * already but the page is still allocated until
 275          * ->invalidate_page returns. So if we increase the sequence
 276          * here the kvm page fault will notice if the spte can't be
 277          * established because the page is going to be freed. If
 278          * instead the kvm page fault establishes the spte before
 279          * ->invalidate_page runs, kvm_unmap_hva will release it
 280          * before returning.
 281          *
 282          * The sequence increase only need to be seen at spin_unlock
 283          * time, and not at spin_lock time.
 284          *
 285          * Increasing the sequence after the spin_unlock would be
 286          * unsafe because the kvm page fault could then establish the
 287          * pte after kvm_unmap_hva returned, without noticing the page
 288          * is going to be freed.
 289          */
 290         idx = srcu_read_lock(&kvm->srcu);
 291         spin_lock(&kvm->mmu_lock);
 292         kvm->mmu_notifier_seq++;
 293         need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
 294         spin_unlock(&kvm->mmu_lock);
 295         srcu_read_unlock(&kvm->srcu, idx);
 296
 297         /* we've to flush the tlb before the pages can be freed */
 298         if (need_tlb_flush)
 299                 kvm_flush_remote_tlbs(kvm);
 300
 301 }
 302
 303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 304                                         struct mm_struct *mm,
 305                                         unsigned long address,
 306                                         pte_t pte)
 307 {
 308         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 309         int idx;
 310
 311         idx = srcu_read_lock(&kvm->srcu);
 312         spin_lock(&kvm->mmu_lock);
 313         kvm->mmu_notifier_seq++;
 314         kvm_set_spte_hva(kvm, address, pte);
 315         spin_unlock(&kvm->mmu_lock);
 316         srcu_read_unlock(&kvm->srcu, idx);
 317 }
 318
 319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 320                                                     struct mm_struct *mm,
 321                                                     unsigned long start,
 322                                                     unsigned long end)
 323 {
 324         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 325         int need_tlb_flush = 0, idx;
 326
 327         idx = srcu_read_lock(&kvm->srcu);
 328         spin_lock(&kvm->mmu_lock);
 329         /*
 330          * The count increase must become visible at unlock time as no
 331          * spte can be established without taking the mmu_lock and
 332          * count is also read inside the mmu_lock critical section.
 333          */
 334         kvm->mmu_notifier_count++;
 335         for (; start < end; start += PAGE_SIZE)
 336                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 337         need_tlb_flush |= kvm->tlbs_dirty;
 338         spin_unlock(&kvm->mmu_lock);
 339         srcu_read_unlock(&kvm->srcu, idx);
 340
 341         /* we've to flush the tlb before the pages can be freed */
 342         if (need_tlb_flush)
 343                 kvm_flush_remote_tlbs(kvm);
 344 }
 345
 346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 347                                                   struct mm_struct *mm,
 348                                                   unsigned long start,
 349                                                   unsigned long end)
 350 {
 351         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 352
 353         spin_lock(&kvm->mmu_lock);
 354         /*
 355          * This sequence increase will notify the kvm page fault that
 356          * the page that is going to be mapped in the spte could have
 357          * been freed.
 358          */
 359         kvm->mmu_notifier_seq++;
 360         /*
 361          * The above sequence increase must be visible before the
 362          * below count decrease but both values are read by the kvm
 363          * page fault under mmu_lock spinlock so we don't need to add
 364          * a smb_wmb() here in between the two.
 365          */
 366         kvm->mmu_notifier_count--;
 367         spin_unlock(&kvm->mmu_lock);
 368
 369         BUG_ON(kvm->mmu_notifier_count < 0);
 370 }
 371
 372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 373                                               struct mm_struct *mm,
 374                                               unsigned long address)
 375 {
 376         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 377         int young, idx;
 378
 379         idx = srcu_read_lock(&kvm->srcu);
 380         spin_lock(&kvm->mmu_lock);
 381         young = kvm_age_hva(kvm, address);
 382         spin_unlock(&kvm->mmu_lock);
 383         srcu_read_unlock(&kvm->srcu, idx);
 384
 385         if (young)
 386                 kvm_flush_remote_tlbs(kvm);
 387
 388         return young;
 389 }
 390
 391 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
 392                                        struct mm_struct *mm,
 393                                        unsigned long address)
 394 {
 395         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 396         int young, idx;
 397
 398         idx = srcu_read_lock(&kvm->srcu);
 399         spin_lock(&kvm->mmu_lock);
 400         young = kvm_test_age_hva(kvm, address);
 401         spin_unlock(&kvm->mmu_lock);
 402         srcu_read_unlock(&kvm->srcu, idx);
 403
 404         return young;
 405 }
 406
 407 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 408                                      struct mm_struct *mm)
 409 {
 410         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 411         int idx;
 412
 413         idx = srcu_read_lock(&kvm->srcu);
 414         kvm_arch_flush_shadow(kvm);
 415         srcu_read_unlock(&kvm->srcu, idx);
 416 }
 417
 418 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 419         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 420         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 421         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 422         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 423         .test_young             = kvm_mmu_notifier_test_young,
 424         .change_pte             = kvm_mmu_notifier_change_pte,
 425         .release                = kvm_mmu_notifier_release,
 426 };
 427
 428 static int kvm_init_mmu_notifier(struct kvm *kvm)
 429 {
 430         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 431         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 432 }
 433
 434 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
 435
 436 static int kvm_init_mmu_notifier(struct kvm *kvm)
 437 {
 438         return 0;
 439 }
 440
 441 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 442
 443 static struct kvm *kvm_create_vm(void)
 444 {
 445         int r, i;
 446         struct kvm *kvm = kvm_arch_alloc_vm();
 447
 448         if (!kvm)
 449                 return ERR_PTR(-ENOMEM);
 450
 451         r = kvm_arch_init_vm(kvm);
 452         if (r)
 453                 goto out_err_nodisable;
 454
 455         r = hardware_enable_all();
 456         if (r)
 457                 goto out_err_nodisable;
 458
 459 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 460         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 461         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 462 #endif
 463
 464         r = -ENOMEM;
 465         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 466         if (!kvm->memslots)
 467                 goto out_err_nosrcu;
 468         if (init_srcu_struct(&kvm->srcu))
 469                 goto out_err_nosrcu;
 470         for (i = 0; i < KVM_NR_BUSES; i++) {
 471                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
 472                                         GFP_KERNEL);
 473                 if (!kvm->buses[i])
 474                         goto out_err;
 475         }
 476
 477         spin_lock_init(&kvm->mmu_lock);
 478         kvm->mm = current->mm;
 479         atomic_inc(&kvm->mm->mm_count);
 480         kvm_eventfd_init(kvm);
 481         mutex_init(&kvm->lock);
 482         mutex_init(&kvm->irq_lock);
 483         mutex_init(&kvm->slots_lock);
 484         atomic_set(&kvm->users_count, 1);
 485
 486         r = kvm_init_mmu_notifier(kvm);
 487         if (r)
 488                 goto out_err;
 489
 490         raw_spin_lock(&kvm_lock);
 491         list_add(&kvm->vm_list, &vm_list);
 492         raw_spin_unlock(&kvm_lock);
 493
 494         return kvm;
 495
 496 out_err:
 497         cleanup_srcu_struct(&kvm->srcu);
 498 out_err_nosrcu:
 499         hardware_disable_all();
 500 out_err_nodisable:
 501         for (i = 0; i < KVM_NR_BUSES; i++)
 502                 kfree(kvm->buses[i]);
 503         kfree(kvm->memslots);
 504         kvm_arch_free_vm(kvm);
 505         return ERR_PTR(r);
 506 }
 507
 508 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
 509 {
 510         if (!memslot->dirty_bitmap)
 511                 return;
 512
 513         if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
 514                 vfree(memslot->dirty_bitmap_head);
 515         else
 516                 kfree(memslot->dirty_bitmap_head);
 517
 518         memslot->dirty_bitmap = NULL;
 519         memslot->dirty_bitmap_head = NULL;
 520 }
 521
 522 /*
 523  * Free any memory in @free but not in @dont.
 524  */
 525 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 526                                   struct kvm_memory_slot *dont)
 527 {
 528         int i;
 529
 530         if (!dont || free->rmap != dont->rmap)
 531                 vfree(free->rmap);
 532
 533         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 534                 kvm_destroy_dirty_bitmap(free);
 535
 536
 537         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 538                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
 539                         vfree(free->lpage_info[i]);
 540                         free->lpage_info[i] = NULL;
 541                 }
 542         }
 543
 544         free->npages = 0;
 545         free->rmap = NULL;
 546 }
 547
 548 void kvm_free_physmem(struct kvm *kvm)
 549 {
 550         int i;
 551         struct kvm_memslots *slots = kvm->memslots;
 552
 553         for (i = 0; i < slots->nmemslots; ++i)
 554                 kvm_free_physmem_slot(&slots->memslots[i], NULL);
 555
 556         kfree(kvm->memslots);
 557 }
 558
 559 static void kvm_destroy_vm(struct kvm *kvm)
 560 {
 561         int i;
 562         struct mm_struct *mm = kvm->mm;
 563
 564         kvm_arch_sync_events(kvm);
 565         raw_spin_lock(&kvm_lock);
 566         list_del(&kvm->vm_list);
 567         raw_spin_unlock(&kvm_lock);
 568         kvm_free_irq_routing(kvm);
 569         for (i = 0; i < KVM_NR_BUSES; i++)
 570                 kvm_io_bus_destroy(kvm->buses[i]);
 571         kvm_coalesced_mmio_free(kvm);
 572 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 573         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 574 #else
 575         kvm_arch_flush_shadow(kvm);
 576 #endif
 577         kvm_arch_destroy_vm(kvm);
 578         kvm_free_physmem(kvm);
 579         cleanup_srcu_struct(&kvm->srcu);
 580         kvm_arch_free_vm(kvm);
 581         hardware_disable_all();
 582         mmdrop(mm);
 583 }
 584
 585 void kvm_get_kvm(struct kvm *kvm)
 586 {
 587         atomic_inc(&kvm->users_count);
 588 }
 589 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 590
 591 void kvm_put_kvm(struct kvm *kvm)
 592 {
 593         if (atomic_dec_and_test(&kvm->users_count))
 594                 kvm_destroy_vm(kvm);
 595 }
 596 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 597
 598
 599 static int kvm_vm_release(struct inode *inode, struct file *filp)
 600 {
 601         struct kvm *kvm = filp->private_data;
 602
 603         kvm_irqfd_release(kvm);
 604
 605         kvm_put_kvm(kvm);
 606         return 0;
 607 }
 608
 609 #ifndef CONFIG_S390
 610 /*
 611  * Allocation size is twice as large as the actual dirty bitmap size.
 612  * This makes it possible to do double buffering: see x86's
 613  * kvm_vm_ioctl_get_dirty_log().
 614  */
 615 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
 616 {
 617         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
 618
 619         if (dirty_bytes > PAGE_SIZE)
 620                 memslot->dirty_bitmap = vzalloc(dirty_bytes);
 621         else
 622                 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
 623
 624         if (!memslot->dirty_bitmap)
 625                 return -ENOMEM;
 626
 627         memslot->dirty_bitmap_head = memslot->dirty_bitmap;
 628         return 0;
 629 }
 630 #endif /* !CONFIG_S390 */
 631
 632 /*
 633  * Allocate some memory and give it an address in the guest physical address
 634  * space.
 635  *
 636  * Discontiguous memory is allowed, mostly for framebuffers.
 637  *
 638  * Must be called holding mmap_sem for write.
 639  */
 640 int __kvm_set_memory_region(struct kvm *kvm,
 641                             struct kvm_userspace_memory_region *mem,
 642                             int user_alloc)
 643 {
 644         int r;
 645         gfn_t base_gfn;
 646         unsigned long npages;
 647         unsigned long i;
 648         struct kvm_memory_slot *memslot;
 649         struct kvm_memory_slot old, new;
 650         struct kvm_memslots *slots, *old_memslots;
 651
 652         r = -EINVAL;
 653         /* General sanity checks */
 654         if (mem->memory_size & (PAGE_SIZE - 1))
 655                 goto out;
 656         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 657                 goto out;
 658         /* We can read the guest memory with __xxx_user() later on. */
 659         if (user_alloc &&
 660             ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
 661              !access_ok(VERIFY_WRITE,
 662                         (void __user *)(unsigned long)mem->userspace_addr,
 663                         mem->memory_size)))
 664                 goto out;
 665         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 666                 goto out;
 667         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 668                 goto out;
 669
 670         memslot = &kvm->memslots->memslots[mem->slot];
 671         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 672         npages = mem->memory_size >> PAGE_SHIFT;
 673
 674         r = -EINVAL;
 675         if (npages > KVM_MEM_MAX_NR_PAGES)
 676                 goto out;
 677
 678         if (!npages)
 679                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 680
 681         new = old = *memslot;
 682
 683         new.id = mem->slot;
 684         new.base_gfn = base_gfn;
 685         new.npages = npages;
 686         new.flags = mem->flags;
 687
 688         /* Disallow changing a memory slot's size. */
 689         r = -EINVAL;
 690         if (npages && old.npages && npages != old.npages)
 691                 goto out_free;
 692
 693         /* Check for overlaps */
 694         r = -EEXIST;
 695         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 696                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
 697
 698                 if (s == memslot || !s->npages)
 699                         continue;
 700                 if (!((base_gfn + npages <= s->base_gfn) ||
 701                       (base_gfn >= s->base_gfn + s->npages)))
 702                         goto out_free;
 703         }
 704
 705         /* Free page dirty bitmap if unneeded */
 706         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 707                 new.dirty_bitmap = NULL;
 708
 709         r = -ENOMEM;
 710
 711         /* Allocate if a slot is being created */
 712 #ifndef CONFIG_S390
 713         if (npages && !new.rmap) {
 714                 new.rmap = vzalloc(npages * sizeof(*new.rmap));
 715
 716                 if (!new.rmap)
 717                         goto out_free;
 718
 719                 new.user_alloc = user_alloc;
 720                 new.userspace_addr = mem->userspace_addr;
 721         }
 722         if (!npages)
 723                 goto skip_lpage;
 724
 725         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 726                 unsigned long ugfn;
 727                 unsigned long j;
 728                 int lpages;
 729                 int level = i + 2;
 730
 731                 /* Avoid unused variable warning if no large pages */
 732                 (void)level;
 733
 734                 if (new.lpage_info[i])
 735                         continue;
 736
 737                 lpages = 1 + ((base_gfn + npages - 1)
 738                              >> KVM_HPAGE_GFN_SHIFT(level));
 739                 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
 740
 741                 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
 742
 743                 if (!new.lpage_info[i])
 744                         goto out_free;
 745
 746                 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
 747                         new.lpage_info[i][0].write_count = 1;
 748                 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
 749                         new.lpage_info[i][lpages - 1].write_count = 1;
 750                 ugfn = new.userspace_addr >> PAGE_SHIFT;
 751                 /*
 752                  * If the gfn and userspace address are not aligned wrt each
 753                  * other, or if explicitly asked to, disable large page
 754                  * support for this slot
 755                  */
 756                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
 757                     !largepages_enabled)
 758                         for (j = 0; j < lpages; ++j)
 759                                 new.lpage_info[i][j].write_count = 1;
 760         }
 761
 762 skip_lpage:
 763
 764         /* Allocate page dirty bitmap if needed */
 765         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 766                 if (kvm_create_dirty_bitmap(&new) < 0)
 767                         goto out_free;
 768                 /* destroy any largepage mappings for dirty tracking */
 769         }
 770 #else  /* not defined CONFIG_S390 */
 771         new.user_alloc = user_alloc;
 772         if (user_alloc)
 773                 new.userspace_addr = mem->userspace_addr;
 774 #endif /* not defined CONFIG_S390 */
 775
 776         if (!npages) {
 777                 r = -ENOMEM;
 778                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 779                 if (!slots)
 780                         goto out_free;
 781                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 782                 if (mem->slot >= slots->nmemslots)
 783                         slots->nmemslots = mem->slot + 1;
 784                 slots->generation++;
 785                 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
 786
 787                 old_memslots = kvm->memslots;
 788                 rcu_assign_pointer(kvm->memslots, slots);
 789                 synchronize_srcu_expedited(&kvm->srcu);
 790                 /* From this point no new shadow pages pointing to a deleted
 791                  * memslot will be created.
 792                  *
 793                  * validation of sp->gfn happens in:
 794                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
 795                  *      - kvm_is_visible_gfn (mmu_check_roots)
 796                  */
 797                 kvm_arch_flush_shadow(kvm);
 798                 kfree(old_memslots);
 799         }
 800
 801         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
 802         if (r)
 803                 goto out_free;
 804
 805         /* map the pages in iommu page table */
 806         if (npages) {
 807                 r = kvm_iommu_map_pages(kvm, &new);
 808                 if (r)
 809                         goto out_free;
 810         }
 811
 812         r = -ENOMEM;
 813         slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 814         if (!slots)
 815                 goto out_free;
 816         memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 817         if (mem->slot >= slots->nmemslots)
 818                 slots->nmemslots = mem->slot + 1;
 819         slots->generation++;
 820
 821         /* actual memory is freed via old in kvm_free_physmem_slot below */
 822         if (!npages) {
 823                 new.rmap = NULL;
 824                 new.dirty_bitmap = NULL;
 825                 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
 826                         new.lpage_info[i] = NULL;
 827         }
 828
 829         slots->memslots[mem->slot] = new;
 830         old_memslots = kvm->memslots;
 831         rcu_assign_pointer(kvm->memslots, slots);
 832         synchronize_srcu_expedited(&kvm->srcu);
 833
 834         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
 835
 836         /*
 837          * If the new memory slot is created, we need to clear all
 838          * mmio sptes.
 839          */
 840         if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
 841                 kvm_arch_flush_shadow(kvm);
 842
 843         kvm_free_physmem_slot(&old, &new);
 844         kfree(old_memslots);
 845
 846         return 0;
 847
 848 out_free:
 849         kvm_free_physmem_slot(&new, &old);
 850 out:
 851         return r;
 852
 853 }
 854 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 855
 856 int kvm_set_memory_region(struct kvm *kvm,
 857                           struct kvm_userspace_memory_region *mem,
 858                           int user_alloc)
 859 {
 860         int r;
 861
 862         mutex_lock(&kvm->slots_lock);
 863         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 864         mutex_unlock(&kvm->slots_lock);
 865         return r;
 866 }
 867 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 868
 869 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 870                                    struct
 871                                    kvm_userspace_memory_region *mem,
 872                                    int user_alloc)
 873 {
 874         if (mem->slot >= KVM_MEMORY_SLOTS)
 875                 return -EINVAL;
 876         return kvm_set_memory_region(kvm, mem, user_alloc);
 877 }
 878
 879 int kvm_get_dirty_log(struct kvm *kvm,
 880                         struct kvm_dirty_log *log, int *is_dirty)
 881 {
 882         struct kvm_memory_slot *memslot;
 883         int r, i;
 884         unsigned long n;
 885         unsigned long any = 0;
 886
 887         r = -EINVAL;
 888         if (log->slot >= KVM_MEMORY_SLOTS)
 889                 goto out;
 890
 891         memslot = &kvm->memslots->memslots[log->slot];
 892         r = -ENOENT;
 893         if (!memslot->dirty_bitmap)
 894                 goto out;
 895
 896         n = kvm_dirty_bitmap_bytes(memslot);
 897
 898         for (i = 0; !any && i < n/sizeof(long); ++i)
 899                 any = memslot->dirty_bitmap[i];
 900
 901         r = -EFAULT;
 902         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 903                 goto out;
 904
 905         if (any)
 906                 *is_dirty = 1;
 907
 908         r = 0;
 909 out:
 910         return r;
 911 }
 912
 913 void kvm_disable_largepages(void)
 914 {
 915         largepages_enabled = false;
 916 }
 917 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 918
 919 int is_error_page(struct page *page)
 920 {
 921         return page == bad_page || page == hwpoison_page || page == fault_page;
 922 }
 923 EXPORT_SYMBOL_GPL(is_error_page);
 924
 925 int is_error_pfn(pfn_t pfn)
 926 {
 927         return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
 928 }
 929 EXPORT_SYMBOL_GPL(is_error_pfn);
 930
 931 int is_hwpoison_pfn(pfn_t pfn)
 932 {
 933         return pfn == hwpoison_pfn;
 934 }
 935 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
 936
 937 int is_fault_pfn(pfn_t pfn)
 938 {
 939         return pfn == fault_pfn;
 940 }
 941 EXPORT_SYMBOL_GPL(is_fault_pfn);
 942
 943 int is_noslot_pfn(pfn_t pfn)
 944 {
 945         return pfn == bad_pfn;
 946 }
 947 EXPORT_SYMBOL_GPL(is_noslot_pfn);
 948
 949 int is_invalid_pfn(pfn_t pfn)
 950 {
 951         return pfn == hwpoison_pfn || pfn == fault_pfn;
 952 }
 953 EXPORT_SYMBOL_GPL(is_invalid_pfn);
 954
 955 static inline unsigned long bad_hva(void)
 956 {
 957         return PAGE_OFFSET;
 958 }
 959
 960 int kvm_is_error_hva(unsigned long addr)
 961 {
 962         return addr == bad_hva();
 963 }
 964 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 965
 966 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
 967                                                 gfn_t gfn)
 968 {
 969         int i;
 970
 971         for (i = 0; i < slots->nmemslots; ++i) {
 972                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 973
 974                 if (gfn >= memslot->base_gfn
 975                     && gfn < memslot->base_gfn + memslot->npages)
 976                         return memslot;
 977         }
 978         return NULL;
 979 }
 980
 981 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 982 {
 983         return __gfn_to_memslot(kvm_memslots(kvm), gfn);
 984 }
 985 EXPORT_SYMBOL_GPL(gfn_to_memslot);
 986
 987 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 988 {
 989         int i;
 990         struct kvm_memslots *slots = kvm_memslots(kvm);
 991
 992         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 993                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 994
 995                 if (memslot->flags & KVM_MEMSLOT_INVALID)
 996                         continue;
 997
 998                 if (gfn >= memslot->base_gfn
 999                     && gfn < memslot->base_gfn + memslot->npages)
1000                         return 1;
1001         }
1002         return 0;
1003 }
1004 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1005
1006 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1007 {
1008         struct vm_area_struct *vma;
1009         unsigned long addr, size;
1010
1011         size = PAGE_SIZE;
1012
1013         addr = gfn_to_hva(kvm, gfn);
1014         if (kvm_is_error_hva(addr))
1015                 return PAGE_SIZE;
1016
1017         down_read(&current->mm->mmap_sem);
1018         vma = find_vma(current->mm, addr);
1019         if (!vma)
1020                 goto out;
1021
1022         size = vma_kernel_pagesize(vma);
1023
1024 out:
1025         up_read(&current->mm->mmap_sem);
1026
1027         return size;
1028 }
1029
1030 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1031                                      gfn_t *nr_pages)
1032 {
1033         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1034                 return bad_hva();
1035
1036         if (nr_pages)
1037                 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1038
1039         return gfn_to_hva_memslot(slot, gfn);
1040 }
1041
1042 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1043 {
1044         return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1045 }
1046 EXPORT_SYMBOL_GPL(gfn_to_hva);
1047
1048 static pfn_t get_fault_pfn(void)
1049 {
1050         get_page(fault_page);
1051         return fault_pfn;
1052 }
1053
1054 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1055         unsigned long start, int write, struct page **page)
1056 {
1057         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1058
1059         if (write)
1060                 flags |= FOLL_WRITE;
1061
1062         return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1063 }
1064
1065 static inline int check_user_page_hwpoison(unsigned long addr)
1066 {
1067         int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1068
1069         rc = __get_user_pages(current, current->mm, addr, 1,
1070                               flags, NULL, NULL, NULL);
1071         return rc == -EHWPOISON;
1072 }
1073
1074 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1075                         bool *async, bool write_fault, bool *writable)
1076 {
1077         struct page *page[1];
1078         int npages = 0;
1079         pfn_t pfn;
1080
1081         /* we can do it either atomically or asynchronously, not both */
1082         BUG_ON(atomic && async);
1083
1084         BUG_ON(!write_fault && !writable);
1085
1086         if (writable)
1087                 *writable = true;
1088
1089         if (atomic || async)
1090                 npages = __get_user_pages_fast(addr, 1, 1, page);
1091
1092         if (unlikely(npages != 1) && !atomic) {
1093                 might_sleep();
1094
1095                 if (writable)
1096                         *writable = write_fault;
1097
1098                 if (async) {
1099                         down_read(&current->mm->mmap_sem);
1100                         npages = get_user_page_nowait(current, current->mm,
1101                                                      addr, write_fault, page);
1102                         up_read(&current->mm->mmap_sem);
1103                 } else
1104                         npages = get_user_pages_fast(addr, 1, write_fault,
1105                                                      page);
1106
1107                 /* map read fault as writable if possible */
1108                 if (unlikely(!write_fault) && npages == 1) {
1109                         struct page *wpage[1];
1110
1111                         npages = __get_user_pages_fast(addr, 1, 1, wpage);
1112                         if (npages == 1) {
1113                                 *writable = true;
1114                                 put_page(page[0]);
1115                                 page[0] = wpage[0];
1116                         }
1117                         npages = 1;
1118                 }
1119         }
1120
1121         if (unlikely(npages != 1)) {
1122                 struct vm_area_struct *vma;
1123
1124                 if (atomic)
1125                         return get_fault_pfn();
1126
1127                 down_read(&current->mm->mmap_sem);
1128                 if (npages == -EHWPOISON ||
1129                         (!async && check_user_page_hwpoison(addr))) {
1130                         up_read(&current->mm->mmap_sem);
1131                         get_page(hwpoison_page);
1132                         return page_to_pfn(hwpoison_page);
1133                 }
1134
1135                 vma = find_vma_intersection(current->mm, addr, addr+1);
1136
1137                 if (vma == NULL)
1138                         pfn = get_fault_pfn();
1139                 else if ((vma->vm_flags & VM_PFNMAP)) {
1140                         pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1141                                 vma->vm_pgoff;
1142                         BUG_ON(!kvm_is_mmio_pfn(pfn));
1143                 } else {
1144                         if (async && (vma->vm_flags & VM_WRITE))
1145                                 *async = true;
1146                         pfn = get_fault_pfn();
1147                 }
1148                 up_read(&current->mm->mmap_sem);
1149         } else
1150                 pfn = page_to_pfn(page[0]);
1151
1152         return pfn;
1153 }
1154
1155 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1156 {
1157         return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1158 }
1159 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1160
1161 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1162                           bool write_fault, bool *writable)
1163 {
1164         unsigned long addr;
1165
1166         if (async)
1167                 *async = false;
1168
1169         addr = gfn_to_hva(kvm, gfn);
1170         if (kvm_is_error_hva(addr)) {
1171                 get_page(bad_page);
1172                 return page_to_pfn(bad_page);
1173         }
1174
1175         return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1176 }
1177
1178 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1179 {
1180         return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1181 }
1182 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1183
1184 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1185                        bool write_fault, bool *writable)
1186 {
1187         return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1188 }
1189 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1190
1191 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1192 {
1193         return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1194 }
1195 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1196
1197 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1198                       bool *writable)
1199 {
1200         return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1201 }
1202 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1203
1204 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1205                          struct kvm_memory_slot *slot, gfn_t gfn)
1206 {
1207         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1208         return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1209 }
1210
1211 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1212                                                                   int nr_pages)
1213 {
1214         unsigned long addr;
1215         gfn_t entry;
1216
1217         addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1218         if (kvm_is_error_hva(addr))
1219                 return -1;
1220
1221         if (entry < nr_pages)
1222                 return 0;
1223
1224         return __get_user_pages_fast(addr, nr_pages, 1, pages);
1225 }
1226 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1227
1228 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1229 {
1230         pfn_t pfn;
1231
1232         pfn = gfn_to_pfn(kvm, gfn);
1233         if (!kvm_is_mmio_pfn(pfn))
1234                 return pfn_to_page(pfn);
1235
1236         WARN_ON(kvm_is_mmio_pfn(pfn));
1237
1238         get_page(bad_page);
1239         return bad_page;
1240 }
1241
1242 EXPORT_SYMBOL_GPL(gfn_to_page);
1243
1244 void kvm_release_page_clean(struct page *page)
1245 {
1246         kvm_release_pfn_clean(page_to_pfn(page));
1247 }
1248 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1249
1250 void kvm_release_pfn_clean(pfn_t pfn)
1251 {
1252         if (!kvm_is_mmio_pfn(pfn))
1253                 put_page(pfn_to_page(pfn));
1254 }
1255 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1256
1257 void kvm_release_page_dirty(struct page *page)
1258 {
1259         kvm_release_pfn_dirty(page_to_pfn(page));
1260 }
1261 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1262
1263 void kvm_release_pfn_dirty(pfn_t pfn)
1264 {
1265         kvm_set_pfn_dirty(pfn);
1266         kvm_release_pfn_clean(pfn);
1267 }
1268 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1269
1270 void kvm_set_page_dirty(struct page *page)
1271 {
1272         kvm_set_pfn_dirty(page_to_pfn(page));
1273 }
1274 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1275
1276 void kvm_set_pfn_dirty(pfn_t pfn)
1277 {
1278         if (!kvm_is_mmio_pfn(pfn)) {
1279                 struct page *page = pfn_to_page(pfn);
1280                 if (!PageReserved(page))
1281                         SetPageDirty(page);
1282         }
1283 }
1284 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1285
1286 void kvm_set_pfn_accessed(pfn_t pfn)
1287 {
1288         if (!kvm_is_mmio_pfn(pfn))
1289                 mark_page_accessed(pfn_to_page(pfn));
1290 }
1291 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1292
1293 void kvm_get_pfn(pfn_t pfn)
1294 {
1295         if (!kvm_is_mmio_pfn(pfn))
1296                 get_page(pfn_to_page(pfn));
1297 }
1298 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1299
1300 static int next_segment(unsigned long len, int offset)
1301 {
1302         if (len > PAGE_SIZE - offset)
1303                 return PAGE_SIZE - offset;
1304         else
1305                 return len;
1306 }
1307
1308 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1309                         int len)
1310 {
1311         int r;
1312         unsigned long addr;
1313
1314         addr = gfn_to_hva(kvm, gfn);
1315         if (kvm_is_error_hva(addr))
1316                 return -EFAULT;
1317         r = __copy_from_user(data, (void __user *)addr + offset, len);
1318         if (r)
1319                 return -EFAULT;
1320         return 0;
1321 }
1322 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1323
1324 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1325 {
1326         gfn_t gfn = gpa >> PAGE_SHIFT;
1327         int seg;
1328         int offset = offset_in_page(gpa);
1329         int ret;
1330
1331         while ((seg = next_segment(len, offset)) != 0) {
1332                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1333                 if (ret < 0)
1334                         return ret;
1335                 offset = 0;
1336                 len -= seg;
1337                 data += seg;
1338                 ++gfn;
1339         }
1340         return 0;
1341 }
1342 EXPORT_SYMBOL_GPL(kvm_read_guest);
1343
1344 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1345                           unsigned long len)
1346 {
1347         int r;
1348         unsigned long addr;
1349         gfn_t gfn = gpa >> PAGE_SHIFT;
1350         int offset = offset_in_page(gpa);
1351
1352         addr = gfn_to_hva(kvm, gfn);
1353         if (kvm_is_error_hva(addr))
1354                 return -EFAULT;
1355         pagefault_disable();
1356         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1357         pagefault_enable();
1358         if (r)
1359                 return -EFAULT;
1360         return 0;
1361 }
1362 EXPORT_SYMBOL(kvm_read_guest_atomic);
1363
1364 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1365                          int offset, int len)
1366 {
1367         int r;
1368         unsigned long addr;
1369
1370         addr = gfn_to_hva(kvm, gfn);
1371         if (kvm_is_error_hva(addr))
1372                 return -EFAULT;
1373         r = __copy_to_user((void __user *)addr + offset, data, len);
1374         if (r)
1375                 return -EFAULT;
1376         mark_page_dirty(kvm, gfn);
1377         return 0;
1378 }
1379 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1380
1381 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1382                     unsigned long len)
1383 {
1384         gfn_t gfn = gpa >> PAGE_SHIFT;
1385         int seg;
1386         int offset = offset_in_page(gpa);
1387         int ret;
1388
1389         while ((seg = next_segment(len, offset)) != 0) {
1390                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1391                 if (ret < 0)
1392                         return ret;
1393                 offset = 0;
1394                 len -= seg;
1395                 data += seg;
1396                 ++gfn;
1397         }
1398         return 0;
1399 }
1400
1401 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1402                               gpa_t gpa)
1403 {
1404         struct kvm_memslots *slots = kvm_memslots(kvm);
1405         int offset = offset_in_page(gpa);
1406         gfn_t gfn = gpa >> PAGE_SHIFT;
1407
1408         ghc->gpa = gpa;
1409         ghc->generation = slots->generation;
1410         ghc->memslot = __gfn_to_memslot(slots, gfn);
1411         ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1412         if (!kvm_is_error_hva(ghc->hva))
1413                 ghc->hva += offset;
1414         else
1415                 return -EFAULT;
1416
1417         return 0;
1418 }
1419 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1420
1421 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1422                            void *data, unsigned long len)
1423 {
1424         struct kvm_memslots *slots = kvm_memslots(kvm);
1425         int r;
1426
1427         if (slots->generation != ghc->generation)
1428                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1429
1430         if (kvm_is_error_hva(ghc->hva))
1431                 return -EFAULT;
1432
1433         r = __copy_to_user((void __user *)ghc->hva, data, len);
1434         if (r)
1435                 return -EFAULT;
1436         mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1437
1438         return 0;
1439 }
1440 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1441
1442 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1443                            void *data, unsigned long len)
1444 {
1445         struct kvm_memslots *slots = kvm_memslots(kvm);
1446         int r;
1447
1448         if (slots->generation != ghc->generation)
1449                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1450
1451         if (kvm_is_error_hva(ghc->hva))
1452                 return -EFAULT;
1453
1454         r = __copy_from_user(data, (void __user *)ghc->hva, len);
1455         if (r)
1456                 return -EFAULT;
1457
1458         return 0;
1459 }
1460 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1461
1462 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1463 {
1464         return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1465                                     offset, len);
1466 }
1467 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1468
1469 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1470 {
1471         gfn_t gfn = gpa >> PAGE_SHIFT;
1472         int seg;
1473         int offset = offset_in_page(gpa);
1474         int ret;
1475
1476         while ((seg = next_segment(len, offset)) != 0) {
1477                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1478                 if (ret < 0)
1479                         return ret;
1480                 offset = 0;
1481                 len -= seg;
1482                 ++gfn;
1483         }
1484         return 0;
1485 }
1486 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1487
1488 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1489                              gfn_t gfn)
1490 {
1491         if (memslot && memslot->dirty_bitmap) {
1492                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1493
1494                 __set_bit_le(rel_gfn, memslot->dirty_bitmap);
1495         }
1496 }
1497
1498 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1499 {
1500         struct kvm_memory_slot *memslot;
1501
1502         memslot = gfn_to_memslot(kvm, gfn);
1503         mark_page_dirty_in_slot(kvm, memslot, gfn);
1504 }
1505
1506 /*
1507  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1508  */
1509 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1510 {
1511         DEFINE_WAIT(wait);
1512
1513         for (;;) {
1514                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1515
1516                 if (kvm_arch_vcpu_runnable(vcpu)) {
1517                         kvm_make_request(KVM_REQ_UNHALT, vcpu);
1518                         break;
1519                 }
1520                 if (kvm_cpu_has_pending_timer(vcpu))
1521                         break;
1522                 if (signal_pending(current))
1523                         break;
1524
1525                 schedule();
1526         }
1527
1528         finish_wait(&vcpu->wq, &wait);
1529 }
1530
1531 void kvm_resched(struct kvm_vcpu *vcpu)
1532 {
1533         if (!need_resched())
1534                 return;
1535         cond_resched();
1536 }
1537 EXPORT_SYMBOL_GPL(kvm_resched);
1538
1539 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1540 {
1541         struct kvm *kvm = me->kvm;
1542         struct kvm_vcpu *vcpu;
1543         int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1544         int yielded = 0;
1545         int pass;
1546         int i;
1547
1548         /*
1549          * We boost the priority of a VCPU that is runnable but not
1550          * currently running, because it got preempted by something
1551          * else and called schedule in __vcpu_run.  Hopefully that
1552          * VCPU is holding the lock that we need and will release it.
1553          * We approximate round-robin by starting at the last boosted VCPU.
1554          */
1555         for (pass = 0; pass < 2 && !yielded; pass++) {
1556                 kvm_for_each_vcpu(i, vcpu, kvm) {
1557                         struct task_struct *task = NULL;
1558                         struct pid *pid;
1559                         if (!pass && i < last_boosted_vcpu) {
1560                                 i = last_boosted_vcpu;
1561                                 continue;
1562                         } else if (pass && i > last_boosted_vcpu)
1563                                 break;
1564                         if (vcpu == me)
1565                                 continue;
1566                         if (waitqueue_active(&vcpu->wq))
1567                                 continue;
1568                         rcu_read_lock();
1569                         pid = rcu_dereference(vcpu->pid);
1570                         if (pid)
1571                                 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1572                         rcu_read_unlock();
1573                         if (!task)
1574                                 continue;
1575                         if (task->flags & PF_VCPU) {
1576                                 put_task_struct(task);
1577                                 continue;
1578                         }
1579                         if (yield_to(task, 1)) {
1580                                 put_task_struct(task);
1581                                 kvm->last_boosted_vcpu = i;
1582                                 yielded = 1;
1583                                 break;
1584                         }
1585                         put_task_struct(task);
1586                 }
1587         }
1588 }
1589 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1590
1591 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1592 {
1593         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1594         struct page *page;
1595
1596         if (vmf->pgoff == 0)
1597                 page = virt_to_page(vcpu->run);
1598 #ifdef CONFIG_X86
1599         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1600                 page = virt_to_page(vcpu->arch.pio_data);
1601 #endif
1602 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1603         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1604                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1605 #endif
1606         else
1607                 return VM_FAULT_SIGBUS;
1608         get_page(page);
1609         vmf->page = page;
1610         return 0;
1611 }
1612
1613 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1614         .fault = kvm_vcpu_fault,
1615 };
1616
1617 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1618 {
1619         vma->vm_ops = &kvm_vcpu_vm_ops;
1620         return 0;
1621 }
1622
1623 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1624 {
1625         struct kvm_vcpu *vcpu = filp->private_data;
1626
1627         kvm_put_kvm(vcpu->kvm);
1628         return 0;
1629 }
1630
1631 static struct file_operations kvm_vcpu_fops = {
1632         .release        = kvm_vcpu_release,
1633         .unlocked_ioctl = kvm_vcpu_ioctl,
1634 #ifdef CONFIG_COMPAT
1635         .compat_ioctl   = kvm_vcpu_compat_ioctl,
1636 #endif
1637         .mmap           = kvm_vcpu_mmap,
1638         .llseek         = noop_llseek,
1639 };
1640
1641 /*
1642  * Allocates an inode for the vcpu.
1643  */
1644 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1645 {
1646         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1647 }
1648
1649 /*
1650  * Creates some virtual cpus.  Good luck creating more than one.
1651  */
1652 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1653 {
1654         int r;
1655         struct kvm_vcpu *vcpu, *v;
1656
1657         vcpu = kvm_arch_vcpu_create(kvm, id);
1658         if (IS_ERR(vcpu))
1659                 return PTR_ERR(vcpu);
1660
1661         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1662
1663         r = kvm_arch_vcpu_setup(vcpu);
1664         if (r)
1665                 goto vcpu_destroy;
1666
1667         mutex_lock(&kvm->lock);
1668         if (!kvm_vcpu_compatible(vcpu)) {
1669                 r = -EINVAL;
1670                 goto unlock_vcpu_destroy;
1671         }
1672         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1673                 r = -EINVAL;
1674                 goto unlock_vcpu_destroy;
1675         }
1676
1677         kvm_for_each_vcpu(r, v, kvm)
1678                 if (v->vcpu_id == id) {
1679                         r = -EEXIST;
1680                         goto unlock_vcpu_destroy;
1681                 }
1682
1683         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1684
1685         /* Now it's all set up, let userspace reach it */
1686         kvm_get_kvm(kvm);
1687         r = create_vcpu_fd(vcpu);
1688         if (r < 0) {
1689                 kvm_put_kvm(kvm);
1690                 goto unlock_vcpu_destroy;
1691         }
1692
1693         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1694         smp_wmb();
1695         atomic_inc(&kvm->online_vcpus);
1696
1697 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1698         if (kvm->bsp_vcpu_id == id)
1699                 kvm->bsp_vcpu = vcpu;
1700 #endif
1701         mutex_unlock(&kvm->lock);
1702         return r;
1703
1704 unlock_vcpu_destroy:
1705         mutex_unlock(&kvm->lock);
1706 vcpu_destroy:
1707         kvm_arch_vcpu_destroy(vcpu);
1708         return r;
1709 }
1710
1711 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1712 {
1713         if (sigset) {
1714                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1715                 vcpu->sigset_active = 1;
1716                 vcpu->sigset = *sigset;
1717         } else
1718                 vcpu->sigset_active = 0;
1719         return 0;
1720 }
1721
1722 static long kvm_vcpu_ioctl(struct file *filp,
1723                            unsigned int ioctl, unsigned long arg)
1724 {
1725         struct kvm_vcpu *vcpu = filp->private_data;
1726         void __user *argp = (void __user *)arg;
1727         int r;
1728         struct kvm_fpu *fpu = NULL;
1729         struct kvm_sregs *kvm_sregs = NULL;
1730
1731         if (vcpu->kvm->mm != current->mm)
1732                 return -EIO;
1733
1734 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1735         /*
1736          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1737          * so vcpu_load() would break it.
1738          */
1739         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1740                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1741 #endif
1742
1743
1744         vcpu_load(vcpu);
1745         switch (ioctl) {
1746         case KVM_RUN:
1747                 r = -EINVAL;
1748                 if (arg)
1749                         goto out;
1750                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1751                 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1752                 break;
1753         case KVM_GET_REGS: {
1754                 struct kvm_regs *kvm_regs;
1755
1756                 r = -ENOMEM;
1757                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1758                 if (!kvm_regs)
1759                         goto out;
1760                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1761                 if (r)
1762                         goto out_free1;
1763                 r = -EFAULT;
1764                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1765                         goto out_free1;
1766                 r = 0;
1767 out_free1:
1768                 kfree(kvm_regs);
1769                 break;
1770         }
1771         case KVM_SET_REGS: {
1772                 struct kvm_regs *kvm_regs;
1773
1774                 r = -ENOMEM;
1775                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1776                 if (!kvm_regs)
1777                         goto out;
1778                 r = -EFAULT;
1779                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1780                         goto out_free2;
1781                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1782                 if (r)
1783                         goto out_free2;
1784                 r = 0;
1785 out_free2:
1786                 kfree(kvm_regs);
1787                 break;
1788         }
1789         case KVM_GET_SREGS: {
1790                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1791                 r = -ENOMEM;
1792                 if (!kvm_sregs)
1793                         goto out;
1794                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1795                 if (r)
1796                         goto out;
1797                 r = -EFAULT;
1798                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1799                         goto out;
1800                 r = 0;
1801                 break;
1802         }
1803         case KVM_SET_SREGS: {
1804                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1805                 r = -ENOMEM;
1806                 if (!kvm_sregs)
1807                         goto out;
1808                 r = -EFAULT;
1809                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1810                         goto out;
1811                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1812                 if (r)
1813                         goto out;
1814                 r = 0;
1815                 break;
1816         }
1817         case KVM_GET_MP_STATE: {
1818                 struct kvm_mp_state mp_state;
1819
1820                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1821                 if (r)
1822                         goto out;
1823                 r = -EFAULT;
1824                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1825                         goto out;
1826                 r = 0;
1827                 break;
1828         }
1829         case KVM_SET_MP_STATE: {
1830                 struct kvm_mp_state mp_state;
1831
1832                 r = -EFAULT;
1833                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1834                         goto out;
1835                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1836                 if (r)
1837                         goto out;
1838                 r = 0;
1839                 break;
1840         }
1841         case KVM_TRANSLATE: {
1842                 struct kvm_translation tr;
1843
1844                 r = -EFAULT;
1845                 if (copy_from_user(&tr, argp, sizeof tr))
1846                         goto out;
1847                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1848                 if (r)
1849                         goto out;
1850                 r = -EFAULT;
1851                 if (copy_to_user(argp, &tr, sizeof tr))
1852                         goto out;
1853                 r = 0;
1854                 break;
1855         }
1856         case KVM_SET_GUEST_DEBUG: {
1857                 struct kvm_guest_debug dbg;
1858
1859                 r = -EFAULT;
1860                 if (copy_from_user(&dbg, argp, sizeof dbg))
1861                         goto out;
1862                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1863                 if (r)
1864                         goto out;
1865                 r = 0;
1866                 break;
1867         }
1868         case KVM_SET_SIGNAL_MASK: {
1869                 struct kvm_signal_mask __user *sigmask_arg = argp;
1870                 struct kvm_signal_mask kvm_sigmask;
1871                 sigset_t sigset, *p;
1872
1873                 p = NULL;
1874                 if (argp) {
1875                         r = -EFAULT;
1876                         if (copy_from_user(&kvm_sigmask, argp,
1877                                            sizeof kvm_sigmask))
1878                                 goto out;
1879                         r = -EINVAL;
1880                         if (kvm_sigmask.len != sizeof sigset)
1881                                 goto out;
1882                         r = -EFAULT;
1883                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1884                                            sizeof sigset))
1885                                 goto out;
1886                         p = &sigset;
1887                 }
1888                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1889                 break;
1890         }
1891         case KVM_GET_FPU: {
1892                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1893                 r = -ENOMEM;
1894                 if (!fpu)
1895                         goto out;
1896                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1897                 if (r)
1898                         goto out;
1899                 r = -EFAULT;
1900                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1901                         goto out;
1902                 r = 0;
1903                 break;
1904         }
1905         case KVM_SET_FPU: {
1906                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1907                 r = -ENOMEM;
1908                 if (!fpu)
1909                         goto out;
1910                 r = -EFAULT;
1911                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1912                         goto out;
1913                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1914                 if (r)
1915                         goto out;
1916                 r = 0;
1917                 break;
1918         }
1919         default:
1920                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1921         }
1922 out:
1923         vcpu_put(vcpu);
1924         kfree(fpu);
1925         kfree(kvm_sregs);
1926         return r;
1927 }
1928
1929 #ifdef CONFIG_COMPAT
1930 static long kvm_vcpu_compat_ioctl(struct file *filp,
1931                                   unsigned int ioctl, unsigned long arg)
1932 {
1933         struct kvm_vcpu *vcpu = filp->private_data;
1934         void __user *argp = compat_ptr(arg);
1935         int r;
1936
1937         if (vcpu->kvm->mm != current->mm)
1938                 return -EIO;
1939
1940         switch (ioctl) {
1941         case KVM_SET_SIGNAL_MASK: {
1942                 struct kvm_signal_mask __user *sigmask_arg = argp;
1943                 struct kvm_signal_mask kvm_sigmask;
1944                 compat_sigset_t csigset;
1945                 sigset_t sigset;
1946
1947                 if (argp) {
1948                         r = -EFAULT;
1949                         if (copy_from_user(&kvm_sigmask, argp,
1950                                            sizeof kvm_sigmask))
1951                                 goto out;
1952                         r = -EINVAL;
1953                         if (kvm_sigmask.len != sizeof csigset)
1954                                 goto out;
1955                         r = -EFAULT;
1956                         if (copy_from_user(&csigset, sigmask_arg->sigset,
1957                                            sizeof csigset))
1958                                 goto out;
1959                 }
1960                 sigset_from_compat(&sigset, &csigset);
1961                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1962                 break;
1963         }
1964         default:
1965                 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1966         }
1967
1968 out:
1969         return r;
1970 }
1971 #endif
1972
1973 static long kvm_vm_ioctl(struct file *filp,
1974                            unsigned int ioctl, unsigned long arg)
1975 {
1976         struct kvm *kvm = filp->private_data;
1977         void __user *argp = (void __user *)arg;
1978         int r;
1979
1980         if (kvm->mm != current->mm)
1981                 return -EIO;
1982         switch (ioctl) {
1983         case KVM_CREATE_VCPU:
1984                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1985                 if (r < 0)
1986                         goto out;
1987                 break;
1988         case KVM_SET_USER_MEMORY_REGION: {
1989                 struct kvm_userspace_memory_region kvm_userspace_mem;
1990
1991                 r = -EFAULT;
1992                 if (copy_from_user(&kvm_userspace_mem, argp,
1993                                                 sizeof kvm_userspace_mem))
1994                         goto out;
1995
1996                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1997                 if (r)
1998                         goto out;
1999                 break;
2000         }
2001         case KVM_GET_DIRTY_LOG: {
2002                 struct kvm_dirty_log log;
2003
2004                 r = -EFAULT;
2005                 if (copy_from_user(&log, argp, sizeof log))
2006                         goto out;
2007                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2008                 if (r)
2009                         goto out;
2010                 break;
2011         }
2012 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2013         case KVM_REGISTER_COALESCED_MMIO: {
2014                 struct kvm_coalesced_mmio_zone zone;
2015                 r = -EFAULT;
2016                 if (copy_from_user(&zone, argp, sizeof zone))
2017                         goto out;
2018                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2019                 if (r)
2020                         goto out;
2021                 r = 0;
2022                 break;
2023         }
2024         case KVM_UNREGISTER_COALESCED_MMIO: {
2025                 struct kvm_coalesced_mmio_zone zone;
2026                 r = -EFAULT;
2027                 if (copy_from_user(&zone, argp, sizeof zone))
2028                         goto out;
2029                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2030                 if (r)
2031                         goto out;
2032                 r = 0;
2033                 break;
2034         }
2035 #endif
2036         case KVM_IRQFD: {
2037                 struct kvm_irqfd data;
2038
2039                 r = -EFAULT;
2040                 if (copy_from_user(&data, argp, sizeof data))
2041                         goto out;
2042                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2043                 break;
2044         }
2045         case KVM_IOEVENTFD: {
2046                 struct kvm_ioeventfd data;
2047
2048                 r = -EFAULT;
2049                 if (copy_from_user(&data, argp, sizeof data))
2050                         goto out;
2051                 r = kvm_ioeventfd(kvm, &data);
2052                 break;
2053         }
2054 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2055         case KVM_SET_BOOT_CPU_ID:
2056                 r = 0;
2057                 mutex_lock(&kvm->lock);
2058                 if (atomic_read(&kvm->online_vcpus) != 0)
2059                         r = -EBUSY;
2060                 else
2061                         kvm->bsp_vcpu_id = arg;
2062                 mutex_unlock(&kvm->lock);
2063                 break;
2064 #endif
2065         default:
2066                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2067                 if (r == -ENOTTY)
2068                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2069         }
2070 out:
2071         return r;
2072 }
2073
2074 #ifdef CONFIG_COMPAT
2075 struct compat_kvm_dirty_log {
2076         __u32 slot;
2077         __u32 padding1;
2078         union {
2079                 compat_uptr_t dirty_bitmap; /* one bit per page */
2080                 __u64 padding2;
2081         };
2082 };
2083
2084 static long kvm_vm_compat_ioctl(struct file *filp,
2085                            unsigned int ioctl, unsigned long arg)
2086 {
2087         struct kvm *kvm = filp->private_data;
2088         int r;
2089
2090         if (kvm->mm != current->mm)
2091                 return -EIO;
2092         switch (ioctl) {
2093         case KVM_GET_DIRTY_LOG: {
2094                 struct compat_kvm_dirty_log compat_log;
2095                 struct kvm_dirty_log log;
2096
2097                 r = -EFAULT;
2098                 if (copy_from_user(&compat_log, (void __user *)arg,
2099                                    sizeof(compat_log)))
2100                         goto out;
2101                 log.slot         = compat_log.slot;
2102                 log.padding1     = compat_log.padding1;
2103                 log.padding2     = compat_log.padding2;
2104                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2105
2106                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2107                 if (r)
2108                         goto out;
2109                 break;
2110         }
2111         default:
2112                 r = kvm_vm_ioctl(filp, ioctl, arg);
2113         }
2114
2115 out:
2116         return r;
2117 }
2118 #endif
2119
2120 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2121 {
2122         struct page *page[1];
2123         unsigned long addr;
2124         int npages;
2125         gfn_t gfn = vmf->pgoff;
2126         struct kvm *kvm = vma->vm_file->private_data;
2127
2128         addr = gfn_to_hva(kvm, gfn);
2129         if (kvm_is_error_hva(addr))
2130                 return VM_FAULT_SIGBUS;
2131
2132         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2133                                 NULL);
2134         if (unlikely(npages != 1))
2135                 return VM_FAULT_SIGBUS;
2136
2137         vmf->page = page[0];
2138         return 0;
2139 }
2140
2141 static const struct vm_operations_struct kvm_vm_vm_ops = {
2142         .fault = kvm_vm_fault,
2143 };
2144
2145 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2146 {
2147         vma->vm_ops = &kvm_vm_vm_ops;
2148         return 0;
2149 }
2150
2151 static struct file_operations kvm_vm_fops = {
2152         .release        = kvm_vm_release,
2153         .unlocked_ioctl = kvm_vm_ioctl,
2154 #ifdef CONFIG_COMPAT
2155         .compat_ioctl   = kvm_vm_compat_ioctl,
2156 #endif
2157         .mmap           = kvm_vm_mmap,
2158         .llseek         = noop_llseek,
2159 };
2160
2161 static int kvm_dev_ioctl_create_vm(void)
2162 {
2163         int r;
2164         struct kvm *kvm;
2165
2166         kvm = kvm_create_vm();
2167         if (IS_ERR(kvm))
2168                 return PTR_ERR(kvm);
2169 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2170         r = kvm_coalesced_mmio_init(kvm);
2171         if (r < 0) {
2172                 kvm_put_kvm(kvm);
2173                 return r;
2174         }
2175 #endif
2176         r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2177         if (r < 0)
2178                 kvm_put_kvm(kvm);
2179
2180         return r;
2181 }
2182
2183 static long kvm_dev_ioctl_check_extension_generic(long arg)
2184 {
2185         switch (arg) {
2186         case KVM_CAP_USER_MEMORY:
2187         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2188         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2189 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2190         case KVM_CAP_SET_BOOT_CPU_ID:
2191 #endif
2192         case KVM_CAP_INTERNAL_ERROR_DATA:
2193                 return 1;
2194 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2195         case KVM_CAP_IRQ_ROUTING:
2196                 return KVM_MAX_IRQ_ROUTES;
2197 #endif
2198         default:
2199                 break;
2200         }
2201         return kvm_dev_ioctl_check_extension(arg);
2202 }
2203
2204 static long kvm_dev_ioctl(struct file *filp,
2205                           unsigned int ioctl, unsigned long arg)
2206 {
2207         long r = -EINVAL;
2208
2209         switch (ioctl) {
2210         case KVM_GET_API_VERSION:
2211                 r = -EINVAL;
2212                 if (arg)
2213                         goto out;
2214                 r = KVM_API_VERSION;
2215                 break;
2216         case KVM_CREATE_VM:
2217                 r = -EINVAL;
2218                 if (arg)
2219                         goto out;
2220                 r = kvm_dev_ioctl_create_vm();
2221                 break;
2222         case KVM_CHECK_EXTENSION:
2223                 r = kvm_dev_ioctl_check_extension_generic(arg);
2224                 break;
2225         case KVM_GET_VCPU_MMAP_SIZE:
2226                 r = -EINVAL;
2227                 if (arg)
2228                         goto out;
2229                 r = PAGE_SIZE;     /* struct kvm_run */
2230 #ifdef CONFIG_X86
2231                 r += PAGE_SIZE;    /* pio data page */
2232 #endif
2233 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2234                 r += PAGE_SIZE;    /* coalesced mmio ring page */
2235 #endif
2236                 break;
2237         case KVM_TRACE_ENABLE:
2238         case KVM_TRACE_PAUSE:
2239         case KVM_TRACE_DISABLE:
2240                 r = -EOPNOTSUPP;
2241                 break;
2242         default:
2243                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2244         }
2245 out:
2246         return r;
2247 }
2248
2249 static struct file_operations kvm_chardev_ops = {
2250         .unlocked_ioctl = kvm_dev_ioctl,
2251         .compat_ioctl   = kvm_dev_ioctl,
2252         .llseek         = noop_llseek,
2253 };
2254
2255 static struct miscdevice kvm_dev = {
2256         KVM_MINOR,
2257         "kvm",
2258         &kvm_chardev_ops,
2259 };
2260
2261 static void hardware_enable_nolock(void *junk)
2262 {
2263         int cpu = raw_smp_processor_id();
2264         int r;
2265
2266         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2267                 return;
2268
2269         cpumask_set_cpu(cpu, cpus_hardware_enabled);
2270
2271         r = kvm_arch_hardware_enable(NULL);
2272
2273         if (r) {
2274                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2275                 atomic_inc(&hardware_enable_failed);
2276                 printk(KERN_INFO "kvm: enabling virtualization on "
2277                                  "CPU%d failed\n", cpu);
2278         }
2279 }
2280
2281 static void hardware_enable(void *junk)
2282 {
2283         raw_spin_lock(&kvm_lock);
2284         hardware_enable_nolock(junk);
2285         raw_spin_unlock(&kvm_lock);
2286 }
2287
2288 static void hardware_disable_nolock(void *junk)
2289 {
2290         int cpu = raw_smp_processor_id();
2291
2292         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2293                 return;
2294         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2295         kvm_arch_hardware_disable(NULL);
2296 }
2297
2298 static void hardware_disable(void *junk)
2299 {
2300         raw_spin_lock(&kvm_lock);
2301         hardware_disable_nolock(junk);
2302         raw_spin_unlock(&kvm_lock);
2303 }
2304
2305 static void hardware_disable_all_nolock(void)
2306 {
2307         BUG_ON(!kvm_usage_count);
2308
2309         kvm_usage_count--;
2310         if (!kvm_usage_count)
2311                 on_each_cpu(hardware_disable_nolock, NULL, 1);
2312 }
2313
2314 static void hardware_disable_all(void)
2315 {
2316         raw_spin_lock(&kvm_lock);
2317         hardware_disable_all_nolock();
2318         raw_spin_unlock(&kvm_lock);
2319 }
2320
2321 static int hardware_enable_all(void)
2322 {
2323         int r = 0;
2324
2325         raw_spin_lock(&kvm_lock);
2326
2327         kvm_usage_count++;
2328         if (kvm_usage_count == 1) {
2329                 atomic_set(&hardware_enable_failed, 0);
2330                 on_each_cpu(hardware_enable_nolock, NULL, 1);
2331
2332                 if (atomic_read(&hardware_enable_failed)) {
2333                         hardware_disable_all_nolock();
2334                         r = -EBUSY;
2335                 }
2336         }
2337
2338         raw_spin_unlock(&kvm_lock);
2339
2340         return r;
2341 }
2342
2343 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2344                            void *v)
2345 {
2346         int cpu = (long)v;
2347
2348         if (!kvm_usage_count)
2349                 return NOTIFY_OK;
2350
2351         val &= ~CPU_TASKS_FROZEN;
2352         switch (val) {
2353         case CPU_DYING:
2354                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2355                        cpu);
2356                 hardware_disable(NULL);
2357                 break;
2358         case CPU_STARTING:
2359                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2360                        cpu);
2361                 hardware_enable(NULL);
2362                 break;
2363         }
2364         return NOTIFY_OK;
2365 }
2366
2367
2368 asmlinkage void kvm_spurious_fault(void)
2369 {
2370         /* Fault while not rebooting.  We want the trace. */
2371         BUG();
2372 }
2373 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2374
2375 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2376                       void *v)
2377 {
2378         /*
2379          * Some (well, at least mine) BIOSes hang on reboot if
2380          * in vmx root mode.
2381          *
2382          * And Intel TXT required VMX off for all cpu when system shutdown.
2383          */
2384         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2385         kvm_rebooting = true;
2386         on_each_cpu(hardware_disable_nolock, NULL, 1);
2387         return NOTIFY_OK;
2388 }
2389
2390 static struct notifier_block kvm_reboot_notifier = {
2391         .notifier_call = kvm_reboot,
2392         .priority = 0,
2393 };
2394
2395 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2396 {
2397         int i;
2398
2399         for (i = 0; i < bus->dev_count; i++) {
2400                 struct kvm_io_device *pos = bus->range[i].dev;
2401
2402                 kvm_iodevice_destructor(pos);
2403         }
2404         kfree(bus);
2405 }
2406
2407 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2408 {
2409         const struct kvm_io_range *r1 = p1;
2410         const struct kvm_io_range *r2 = p2;
2411
2412         if (r1->addr < r2->addr)
2413                 return -1;
2414         if (r1->addr + r1->len > r2->addr + r2->len)
2415                 return 1;
2416         return 0;
2417 }
2418
2419 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2420                           gpa_t addr, int len)
2421 {
2422         if (bus->dev_count == NR_IOBUS_DEVS)
2423                 return -ENOSPC;
2424
2425         bus->range[bus->dev_count++] = (struct kvm_io_range) {
2426                 .addr = addr,
2427                 .len = len,
2428                 .dev = dev,
2429         };
2430
2431         sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2432                 kvm_io_bus_sort_cmp, NULL);
2433
2434         return 0;
2435 }
2436
2437 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2438                              gpa_t addr, int len)
2439 {
2440         struct kvm_io_range *range, key;
2441         int off;
2442
2443         key = (struct kvm_io_range) {
2444                 .addr = addr,
2445                 .len = len,
2446         };
2447
2448         range = bsearch(&key, bus->range, bus->dev_count,
2449                         sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2450         if (range == NULL)
2451                 return -ENOENT;
2452
2453         off = range - bus->range;
2454
2455         while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2456                 off--;
2457
2458         return off;
2459 }
2460
2461 /* kvm_io_bus_write - called under kvm->slots_lock */
2462 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2463                      int len, const void *val)
2464 {
2465         int idx;
2466         struct kvm_io_bus *bus;
2467         struct kvm_io_range range;
2468
2469         range = (struct kvm_io_range) {
2470                 .addr = addr,
2471                 .len = len,
2472         };
2473
2474         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2475         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2476         if (idx < 0)
2477                 return -EOPNOTSUPP;
2478
2479         while (idx < bus->dev_count &&
2480                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2481                 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2482                         return 0;
2483                 idx++;
2484         }
2485
2486         return -EOPNOTSUPP;
2487 }
2488
2489 /* kvm_io_bus_read - called under kvm->slots_lock */
2490 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2491                     int len, void *val)
2492 {
2493         int idx;
2494         struct kvm_io_bus *bus;
2495         struct kvm_io_range range;
2496
2497         range = (struct kvm_io_range) {
2498                 .addr = addr,
2499                 .len = len,
2500         };
2501
2502         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2503         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2504         if (idx < 0)
2505                 return -EOPNOTSUPP;
2506
2507         while (idx < bus->dev_count &&
2508                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2509                 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2510                         return 0;
2511                 idx++;
2512         }
2513
2514         return -EOPNOTSUPP;
2515 }
2516
2517 /* Caller must hold slots_lock. */
2518 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2519                             int len, struct kvm_io_device *dev)
2520 {
2521         struct kvm_io_bus *new_bus, *bus;
2522
2523         bus = kvm->buses[bus_idx];
2524         if (bus->dev_count > NR_IOBUS_DEVS-1)
2525                 return -ENOSPC;
2526
2527         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2528         if (!new_bus)
2529                 return -ENOMEM;
2530         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2531         kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2532         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2533         synchronize_srcu_expedited(&kvm->srcu);
2534         kfree(bus);
2535
2536         return 0;
2537 }
2538
2539 /* Caller must hold slots_lock. */
2540 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2541                               struct kvm_io_device *dev)
2542 {
2543         int i, r;
2544         struct kvm_io_bus *new_bus, *bus;
2545
2546         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2547         if (!new_bus)
2548                 return -ENOMEM;
2549
2550         bus = kvm->buses[bus_idx];
2551         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2552
2553         r = -ENOENT;
2554         for (i = 0; i < new_bus->dev_count; i++)
2555                 if (new_bus->range[i].dev == dev) {
2556                         r = 0;
2557                         new_bus->dev_count--;
2558                         new_bus->range[i] = new_bus->range[new_bus->dev_count];
2559                         sort(new_bus->range, new_bus->dev_count,
2560                              sizeof(struct kvm_io_range),
2561                              kvm_io_bus_sort_cmp, NULL);
2562                         break;
2563                 }
2564
2565         if (r) {
2566                 kfree(new_bus);
2567                 return r;
2568         }
2569
2570         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2571         synchronize_srcu_expedited(&kvm->srcu);
2572         kfree(bus);
2573         return r;
2574 }
2575
2576 static struct notifier_block kvm_cpu_notifier = {
2577         .notifier_call = kvm_cpu_hotplug,
2578 };
2579
2580 static int vm_stat_get(void *_offset, u64 *val)
2581 {
2582         unsigned offset = (long)_offset;
2583         struct kvm *kvm;
2584
2585         *val = 0;
2586         raw_spin_lock(&kvm_lock);
2587         list_for_each_entry(kvm, &vm_list, vm_list)
2588                 *val += *(u32 *)((void *)kvm + offset);
2589         raw_spin_unlock(&kvm_lock);
2590         return 0;
2591 }
2592
2593 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2594
2595 static int vcpu_stat_get(void *_offset, u64 *val)
2596 {
2597         unsigned offset = (long)_offset;
2598         struct kvm *kvm;
2599         struct kvm_vcpu *vcpu;
2600         int i;
2601
2602         *val = 0;
2603         raw_spin_lock(&kvm_lock);
2604         list_for_each_entry(kvm, &vm_list, vm_list)
2605                 kvm_for_each_vcpu(i, vcpu, kvm)
2606                         *val += *(u32 *)((void *)vcpu + offset);
2607
2608         raw_spin_unlock(&kvm_lock);
2609         return 0;
2610 }
2611
2612 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2613
2614 static const struct file_operations *stat_fops[] = {
2615         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2616         [KVM_STAT_VM]   = &vm_stat_fops,
2617 };
2618
2619 static void kvm_init_debug(void)
2620 {
2621         struct kvm_stats_debugfs_item *p;
2622
2623         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2624         for (p = debugfs_entries; p->name; ++p)
2625                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2626                                                 (void *)(long)p->offset,
2627                                                 stat_fops[p->kind]);
2628 }
2629
2630 static void kvm_exit_debug(void)
2631 {
2632         struct kvm_stats_debugfs_item *p;
2633
2634         for (p = debugfs_entries; p->name; ++p)
2635                 debugfs_remove(p->dentry);
2636         debugfs_remove(kvm_debugfs_dir);
2637 }
2638
2639 static int kvm_suspend(void)
2640 {
2641         if (kvm_usage_count)
2642                 hardware_disable_nolock(NULL);
2643         return 0;
2644 }
2645
2646 static void kvm_resume(void)
2647 {
2648         if (kvm_usage_count) {
2649                 WARN_ON(raw_spin_is_locked(&kvm_lock));
2650                 hardware_enable_nolock(NULL);
2651         }
2652 }
2653
2654 static struct syscore_ops kvm_syscore_ops = {
2655         .suspend = kvm_suspend,
2656         .resume = kvm_resume,
2657 };
2658
2659 struct page *bad_page;
2660 pfn_t bad_pfn;
2661
2662 static inline
2663 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2664 {
2665         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2666 }
2667
2668 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2669 {
2670         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2671
2672         kvm_arch_vcpu_load(vcpu, cpu);
2673 }
2674
2675 static void kvm_sched_out(struct preempt_notifier *pn,
2676                           struct task_struct *next)
2677 {
2678         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2679
2680         kvm_arch_vcpu_put(vcpu);
2681 }
2682
2683 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2684                   struct module *module)
2685 {
2686         int r;
2687         int cpu;
2688
2689         r = kvm_arch_init(opaque);
2690         if (r)
2691                 goto out_fail;
2692
2693         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2694
2695         if (bad_page == NULL) {
2696                 r = -ENOMEM;
2697                 goto out;
2698         }
2699
2700         bad_pfn = page_to_pfn(bad_page);
2701
2702         hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2703
2704         if (hwpoison_page == NULL) {
2705                 r = -ENOMEM;
2706                 goto out_free_0;
2707         }
2708
2709         hwpoison_pfn = page_to_pfn(hwpoison_page);
2710
2711         fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2712
2713         if (fault_page == NULL) {
2714                 r = -ENOMEM;
2715                 goto out_free_0;
2716         }
2717
2718         fault_pfn = page_to_pfn(fault_page);
2719
2720         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2721                 r = -ENOMEM;
2722                 goto out_free_0;
2723         }
2724
2725         r = kvm_arch_hardware_setup();
2726         if (r < 0)
2727                 goto out_free_0a;
2728
2729         for_each_online_cpu(cpu) {
2730                 smp_call_function_single(cpu,
2731                                 kvm_arch_check_processor_compat,
2732                                 &r, 1);
2733                 if (r < 0)
2734                         goto out_free_1;
2735         }
2736
2737         r = register_cpu_notifier(&kvm_cpu_notifier);
2738         if (r)
2739                 goto out_free_2;
2740         register_reboot_notifier(&kvm_reboot_notifier);
2741
2742         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2743         if (!vcpu_align)
2744                 vcpu_align = __alignof__(struct kvm_vcpu);
2745         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2746                                            0, NULL);
2747         if (!kvm_vcpu_cache) {
2748                 r = -ENOMEM;
2749                 goto out_free_3;
2750         }
2751
2752         r = kvm_async_pf_init();
2753         if (r)
2754                 goto out_free;
2755
2756         kvm_chardev_ops.owner = module;
2757         kvm_vm_fops.owner = module;
2758         kvm_vcpu_fops.owner = module;
2759
2760         r = misc_register(&kvm_dev);
2761         if (r) {
2762                 printk(KERN_ERR "kvm: misc device register failed\n");
2763                 goto out_unreg;
2764         }
2765
2766         register_syscore_ops(&kvm_syscore_ops);
2767
2768         kvm_preempt_ops.sched_in = kvm_sched_in;
2769         kvm_preempt_ops.sched_out = kvm_sched_out;
2770
2771         kvm_init_debug();
2772
2773         return 0;
2774
2775 out_unreg:
2776         kvm_async_pf_deinit();
2777 out_free:
2778         kmem_cache_destroy(kvm_vcpu_cache);
2779 out_free_3:
2780         unregister_reboot_notifier(&kvm_reboot_notifier);
2781         unregister_cpu_notifier(&kvm_cpu_notifier);
2782 out_free_2:
2783 out_free_1:
2784         kvm_arch_hardware_unsetup();
2785 out_free_0a:
2786         free_cpumask_var(cpus_hardware_enabled);
2787 out_free_0:
2788         if (fault_page)
2789                 __free_page(fault_page);
2790         if (hwpoison_page)
2791                 __free_page(hwpoison_page);
2792         __free_page(bad_page);
2793 out:
2794         kvm_arch_exit();
2795 out_fail:
2796         return r;
2797 }
2798 EXPORT_SYMBOL_GPL(kvm_init);
2799
2800 void kvm_exit(void)
2801 {
2802         kvm_exit_debug();
2803         misc_deregister(&kvm_dev);
2804         kmem_cache_destroy(kvm_vcpu_cache);
2805         kvm_async_pf_deinit();
2806         unregister_syscore_ops(&kvm_syscore_ops);
2807         unregister_reboot_notifier(&kvm_reboot_notifier);
2808         unregister_cpu_notifier(&kvm_cpu_notifier);
2809         on_each_cpu(hardware_disable_nolock, NULL, 1);
2810         kvm_arch_hardware_unsetup();
2811         kvm_arch_exit();
2812         free_cpumask_var(cpus_hardware_enabled);
2813         __free_page(hwpoison_page);
2814         __free_page(bad_page);
2815 }
2816 EXPORT_SYMBOL_GPL(kvm_exit);