KVM: Allow internal errors reported to userspace to carry extra data
[linux-2.6.git] / virt / kvm / kvm_main.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * This module enables machines with Intel VT-x extensions to run virtual
5  * machines without emulation or binary translation.
6  *
7  * Copyright (C) 2006 Qumranet, Inc.
8  *
9  * Authors:
10  *   Avi Kivity   <avi@qumranet.com>
11  *   Yaniv Kamay  <yaniv@qumranet.com>
12  *
13  * This work is licensed under the terms of the GNU GPL, version 2.  See
14  * the COPYING file in the top-level directory.
15  *
16  */
17
18 #include "iodev.h"
19
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
26 #include <linux/mm.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47
48 #include <asm/processor.h>
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51 #include <asm/pgtable.h>
52
53 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
54 #include "coalesced_mmio.h"
55 #endif
56
57 #define CREATE_TRACE_POINTS
58 #include <trace/events/kvm.h>
59
60 MODULE_AUTHOR("Qumranet");
61 MODULE_LICENSE("GPL");
62
63 /*
64  * Ordering of locks:
65  *
66  *              kvm->slots_lock --> kvm->lock --> kvm->irq_lock
67  */
68
69 DEFINE_SPINLOCK(kvm_lock);
70 LIST_HEAD(vm_list);
71
72 static cpumask_var_t cpus_hardware_enabled;
73 static int kvm_usage_count = 0;
74 static atomic_t hardware_enable_failed;
75
76 struct kmem_cache *kvm_vcpu_cache;
77 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
78
79 static __read_mostly struct preempt_ops kvm_preempt_ops;
80
81 struct dentry *kvm_debugfs_dir;
82
83 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
84                            unsigned long arg);
85 static int hardware_enable_all(void);
86 static void hardware_disable_all(void);
87
88 static bool kvm_rebooting;
89
90 static bool largepages_enabled = true;
91
92 inline int kvm_is_mmio_pfn(pfn_t pfn)
93 {
94         if (pfn_valid(pfn)) {
95                 struct page *page = compound_head(pfn_to_page(pfn));
96                 return PageReserved(page);
97         }
98
99         return true;
100 }
101
102 /*
103  * Switches to specified vcpu, until a matching vcpu_put()
104  */
105 void vcpu_load(struct kvm_vcpu *vcpu)
106 {
107         int cpu;
108
109         mutex_lock(&vcpu->mutex);
110         cpu = get_cpu();
111         preempt_notifier_register(&vcpu->preempt_notifier);
112         kvm_arch_vcpu_load(vcpu, cpu);
113         put_cpu();
114 }
115
116 void vcpu_put(struct kvm_vcpu *vcpu)
117 {
118         preempt_disable();
119         kvm_arch_vcpu_put(vcpu);
120         preempt_notifier_unregister(&vcpu->preempt_notifier);
121         preempt_enable();
122         mutex_unlock(&vcpu->mutex);
123 }
124
125 static void ack_flush(void *_completed)
126 {
127 }
128
129 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
130 {
131         int i, cpu, me;
132         cpumask_var_t cpus;
133         bool called = true;
134         struct kvm_vcpu *vcpu;
135
136         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
137
138         spin_lock(&kvm->requests_lock);
139         me = smp_processor_id();
140         kvm_for_each_vcpu(i, vcpu, kvm) {
141                 if (test_and_set_bit(req, &vcpu->requests))
142                         continue;
143                 cpu = vcpu->cpu;
144                 if (cpus != NULL && cpu != -1 && cpu != me)
145                         cpumask_set_cpu(cpu, cpus);
146         }
147         if (unlikely(cpus == NULL))
148                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
149         else if (!cpumask_empty(cpus))
150                 smp_call_function_many(cpus, ack_flush, NULL, 1);
151         else
152                 called = false;
153         spin_unlock(&kvm->requests_lock);
154         free_cpumask_var(cpus);
155         return called;
156 }
157
158 void kvm_flush_remote_tlbs(struct kvm *kvm)
159 {
160         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
161                 ++kvm->stat.remote_tlb_flush;
162 }
163
164 void kvm_reload_remote_mmus(struct kvm *kvm)
165 {
166         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
167 }
168
169 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
170 {
171         struct page *page;
172         int r;
173
174         mutex_init(&vcpu->mutex);
175         vcpu->cpu = -1;
176         vcpu->kvm = kvm;
177         vcpu->vcpu_id = id;
178         init_waitqueue_head(&vcpu->wq);
179
180         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
181         if (!page) {
182                 r = -ENOMEM;
183                 goto fail;
184         }
185         vcpu->run = page_address(page);
186
187         r = kvm_arch_vcpu_init(vcpu);
188         if (r < 0)
189                 goto fail_free_run;
190         return 0;
191
192 fail_free_run:
193         free_page((unsigned long)vcpu->run);
194 fail:
195         return r;
196 }
197 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
198
199 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
200 {
201         kvm_arch_vcpu_uninit(vcpu);
202         free_page((unsigned long)vcpu->run);
203 }
204 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
205
206 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
207 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
208 {
209         return container_of(mn, struct kvm, mmu_notifier);
210 }
211
212 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
213                                              struct mm_struct *mm,
214                                              unsigned long address)
215 {
216         struct kvm *kvm = mmu_notifier_to_kvm(mn);
217         int need_tlb_flush;
218
219         /*
220          * When ->invalidate_page runs, the linux pte has been zapped
221          * already but the page is still allocated until
222          * ->invalidate_page returns. So if we increase the sequence
223          * here the kvm page fault will notice if the spte can't be
224          * established because the page is going to be freed. If
225          * instead the kvm page fault establishes the spte before
226          * ->invalidate_page runs, kvm_unmap_hva will release it
227          * before returning.
228          *
229          * The sequence increase only need to be seen at spin_unlock
230          * time, and not at spin_lock time.
231          *
232          * Increasing the sequence after the spin_unlock would be
233          * unsafe because the kvm page fault could then establish the
234          * pte after kvm_unmap_hva returned, without noticing the page
235          * is going to be freed.
236          */
237         spin_lock(&kvm->mmu_lock);
238         kvm->mmu_notifier_seq++;
239         need_tlb_flush = kvm_unmap_hva(kvm, address);
240         spin_unlock(&kvm->mmu_lock);
241
242         /* we've to flush the tlb before the pages can be freed */
243         if (need_tlb_flush)
244                 kvm_flush_remote_tlbs(kvm);
245
246 }
247
248 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
249                                         struct mm_struct *mm,
250                                         unsigned long address,
251                                         pte_t pte)
252 {
253         struct kvm *kvm = mmu_notifier_to_kvm(mn);
254
255         spin_lock(&kvm->mmu_lock);
256         kvm->mmu_notifier_seq++;
257         kvm_set_spte_hva(kvm, address, pte);
258         spin_unlock(&kvm->mmu_lock);
259 }
260
261 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
262                                                     struct mm_struct *mm,
263                                                     unsigned long start,
264                                                     unsigned long end)
265 {
266         struct kvm *kvm = mmu_notifier_to_kvm(mn);
267         int need_tlb_flush = 0;
268
269         spin_lock(&kvm->mmu_lock);
270         /*
271          * The count increase must become visible at unlock time as no
272          * spte can be established without taking the mmu_lock and
273          * count is also read inside the mmu_lock critical section.
274          */
275         kvm->mmu_notifier_count++;
276         for (; start < end; start += PAGE_SIZE)
277                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
278         spin_unlock(&kvm->mmu_lock);
279
280         /* we've to flush the tlb before the pages can be freed */
281         if (need_tlb_flush)
282                 kvm_flush_remote_tlbs(kvm);
283 }
284
285 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
286                                                   struct mm_struct *mm,
287                                                   unsigned long start,
288                                                   unsigned long end)
289 {
290         struct kvm *kvm = mmu_notifier_to_kvm(mn);
291
292         spin_lock(&kvm->mmu_lock);
293         /*
294          * This sequence increase will notify the kvm page fault that
295          * the page that is going to be mapped in the spte could have
296          * been freed.
297          */
298         kvm->mmu_notifier_seq++;
299         /*
300          * The above sequence increase must be visible before the
301          * below count decrease but both values are read by the kvm
302          * page fault under mmu_lock spinlock so we don't need to add
303          * a smb_wmb() here in between the two.
304          */
305         kvm->mmu_notifier_count--;
306         spin_unlock(&kvm->mmu_lock);
307
308         BUG_ON(kvm->mmu_notifier_count < 0);
309 }
310
311 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
312                                               struct mm_struct *mm,
313                                               unsigned long address)
314 {
315         struct kvm *kvm = mmu_notifier_to_kvm(mn);
316         int young;
317
318         spin_lock(&kvm->mmu_lock);
319         young = kvm_age_hva(kvm, address);
320         spin_unlock(&kvm->mmu_lock);
321
322         if (young)
323                 kvm_flush_remote_tlbs(kvm);
324
325         return young;
326 }
327
328 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
329                                      struct mm_struct *mm)
330 {
331         struct kvm *kvm = mmu_notifier_to_kvm(mn);
332         kvm_arch_flush_shadow(kvm);
333 }
334
335 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
336         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
337         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
338         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
339         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
340         .change_pte             = kvm_mmu_notifier_change_pte,
341         .release                = kvm_mmu_notifier_release,
342 };
343 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
344
345 static struct kvm *kvm_create_vm(void)
346 {
347         int r = 0;
348         struct kvm *kvm = kvm_arch_create_vm();
349 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
350         struct page *page;
351 #endif
352
353         if (IS_ERR(kvm))
354                 goto out;
355
356         r = hardware_enable_all();
357         if (r)
358                 goto out_err_nodisable;
359
360 #ifdef CONFIG_HAVE_KVM_IRQCHIP
361         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
362         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
363 #endif
364
365 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
366         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
367         if (!page) {
368                 r = -ENOMEM;
369                 goto out_err;
370         }
371         kvm->coalesced_mmio_ring =
372                         (struct kvm_coalesced_mmio_ring *)page_address(page);
373 #endif
374
375 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
376         {
377                 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
378                 r = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
379                 if (r) {
380 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
381                         put_page(page);
382 #endif
383                         goto out_err;
384                 }
385         }
386 #endif
387
388         kvm->mm = current->mm;
389         atomic_inc(&kvm->mm->mm_count);
390         spin_lock_init(&kvm->mmu_lock);
391         spin_lock_init(&kvm->requests_lock);
392         kvm_io_bus_init(&kvm->pio_bus);
393         kvm_eventfd_init(kvm);
394         mutex_init(&kvm->lock);
395         mutex_init(&kvm->irq_lock);
396         kvm_io_bus_init(&kvm->mmio_bus);
397         init_rwsem(&kvm->slots_lock);
398         atomic_set(&kvm->users_count, 1);
399         spin_lock(&kvm_lock);
400         list_add(&kvm->vm_list, &vm_list);
401         spin_unlock(&kvm_lock);
402 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
403         kvm_coalesced_mmio_init(kvm);
404 #endif
405 out:
406         return kvm;
407
408 out_err:
409         hardware_disable_all();
410 out_err_nodisable:
411         kfree(kvm);
412         return ERR_PTR(r);
413 }
414
415 /*
416  * Free any memory in @free but not in @dont.
417  */
418 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
419                                   struct kvm_memory_slot *dont)
420 {
421         int i;
422
423         if (!dont || free->rmap != dont->rmap)
424                 vfree(free->rmap);
425
426         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
427                 vfree(free->dirty_bitmap);
428
429
430         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
431                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
432                         vfree(free->lpage_info[i]);
433                         free->lpage_info[i] = NULL;
434                 }
435         }
436
437         free->npages = 0;
438         free->dirty_bitmap = NULL;
439         free->rmap = NULL;
440 }
441
442 void kvm_free_physmem(struct kvm *kvm)
443 {
444         int i;
445
446         for (i = 0; i < kvm->nmemslots; ++i)
447                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
448 }
449
450 static void kvm_destroy_vm(struct kvm *kvm)
451 {
452         struct mm_struct *mm = kvm->mm;
453
454         kvm_arch_sync_events(kvm);
455         spin_lock(&kvm_lock);
456         list_del(&kvm->vm_list);
457         spin_unlock(&kvm_lock);
458         kvm_free_irq_routing(kvm);
459         kvm_io_bus_destroy(&kvm->pio_bus);
460         kvm_io_bus_destroy(&kvm->mmio_bus);
461 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
462         if (kvm->coalesced_mmio_ring != NULL)
463                 free_page((unsigned long)kvm->coalesced_mmio_ring);
464 #endif
465 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
466         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
467 #else
468         kvm_arch_flush_shadow(kvm);
469 #endif
470         kvm_arch_destroy_vm(kvm);
471         hardware_disable_all();
472         mmdrop(mm);
473 }
474
475 void kvm_get_kvm(struct kvm *kvm)
476 {
477         atomic_inc(&kvm->users_count);
478 }
479 EXPORT_SYMBOL_GPL(kvm_get_kvm);
480
481 void kvm_put_kvm(struct kvm *kvm)
482 {
483         if (atomic_dec_and_test(&kvm->users_count))
484                 kvm_destroy_vm(kvm);
485 }
486 EXPORT_SYMBOL_GPL(kvm_put_kvm);
487
488
489 static int kvm_vm_release(struct inode *inode, struct file *filp)
490 {
491         struct kvm *kvm = filp->private_data;
492
493         kvm_irqfd_release(kvm);
494
495         kvm_put_kvm(kvm);
496         return 0;
497 }
498
499 /*
500  * Allocate some memory and give it an address in the guest physical address
501  * space.
502  *
503  * Discontiguous memory is allowed, mostly for framebuffers.
504  *
505  * Must be called holding mmap_sem for write.
506  */
507 int __kvm_set_memory_region(struct kvm *kvm,
508                             struct kvm_userspace_memory_region *mem,
509                             int user_alloc)
510 {
511         int r;
512         gfn_t base_gfn;
513         unsigned long npages;
514         unsigned long i;
515         struct kvm_memory_slot *memslot;
516         struct kvm_memory_slot old, new;
517
518         r = -EINVAL;
519         /* General sanity checks */
520         if (mem->memory_size & (PAGE_SIZE - 1))
521                 goto out;
522         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
523                 goto out;
524         if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
525                 goto out;
526         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
527                 goto out;
528         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
529                 goto out;
530
531         memslot = &kvm->memslots[mem->slot];
532         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
533         npages = mem->memory_size >> PAGE_SHIFT;
534
535         if (!npages)
536                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
537
538         new = old = *memslot;
539
540         new.base_gfn = base_gfn;
541         new.npages = npages;
542         new.flags = mem->flags;
543
544         /* Disallow changing a memory slot's size. */
545         r = -EINVAL;
546         if (npages && old.npages && npages != old.npages)
547                 goto out_free;
548
549         /* Check for overlaps */
550         r = -EEXIST;
551         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
552                 struct kvm_memory_slot *s = &kvm->memslots[i];
553
554                 if (s == memslot || !s->npages)
555                         continue;
556                 if (!((base_gfn + npages <= s->base_gfn) ||
557                       (base_gfn >= s->base_gfn + s->npages)))
558                         goto out_free;
559         }
560
561         /* Free page dirty bitmap if unneeded */
562         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
563                 new.dirty_bitmap = NULL;
564
565         r = -ENOMEM;
566
567         /* Allocate if a slot is being created */
568 #ifndef CONFIG_S390
569         if (npages && !new.rmap) {
570                 new.rmap = vmalloc(npages * sizeof(struct page *));
571
572                 if (!new.rmap)
573                         goto out_free;
574
575                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
576
577                 new.user_alloc = user_alloc;
578                 /*
579                  * hva_to_rmmap() serialzies with the mmu_lock and to be
580                  * safe it has to ignore memslots with !user_alloc &&
581                  * !userspace_addr.
582                  */
583                 if (user_alloc)
584                         new.userspace_addr = mem->userspace_addr;
585                 else
586                         new.userspace_addr = 0;
587         }
588         if (!npages)
589                 goto skip_lpage;
590
591         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
592                 unsigned long ugfn;
593                 unsigned long j;
594                 int lpages;
595                 int level = i + 2;
596
597                 /* Avoid unused variable warning if no large pages */
598                 (void)level;
599
600                 if (new.lpage_info[i])
601                         continue;
602
603                 lpages = 1 + (base_gfn + npages - 1) /
604                              KVM_PAGES_PER_HPAGE(level);
605                 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
606
607                 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
608
609                 if (!new.lpage_info[i])
610                         goto out_free;
611
612                 memset(new.lpage_info[i], 0,
613                        lpages * sizeof(*new.lpage_info[i]));
614
615                 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
616                         new.lpage_info[i][0].write_count = 1;
617                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
618                         new.lpage_info[i][lpages - 1].write_count = 1;
619                 ugfn = new.userspace_addr >> PAGE_SHIFT;
620                 /*
621                  * If the gfn and userspace address are not aligned wrt each
622                  * other, or if explicitly asked to, disable large page
623                  * support for this slot
624                  */
625                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
626                     !largepages_enabled)
627                         for (j = 0; j < lpages; ++j)
628                                 new.lpage_info[i][j].write_count = 1;
629         }
630
631 skip_lpage:
632
633         /* Allocate page dirty bitmap if needed */
634         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
635                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
636
637                 new.dirty_bitmap = vmalloc(dirty_bytes);
638                 if (!new.dirty_bitmap)
639                         goto out_free;
640                 memset(new.dirty_bitmap, 0, dirty_bytes);
641                 if (old.npages)
642                         kvm_arch_flush_shadow(kvm);
643         }
644 #else  /* not defined CONFIG_S390 */
645         new.user_alloc = user_alloc;
646         if (user_alloc)
647                 new.userspace_addr = mem->userspace_addr;
648 #endif /* not defined CONFIG_S390 */
649
650         if (!npages)
651                 kvm_arch_flush_shadow(kvm);
652
653         spin_lock(&kvm->mmu_lock);
654         if (mem->slot >= kvm->nmemslots)
655                 kvm->nmemslots = mem->slot + 1;
656
657         *memslot = new;
658         spin_unlock(&kvm->mmu_lock);
659
660         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
661         if (r) {
662                 spin_lock(&kvm->mmu_lock);
663                 *memslot = old;
664                 spin_unlock(&kvm->mmu_lock);
665                 goto out_free;
666         }
667
668         kvm_free_physmem_slot(&old, npages ? &new : NULL);
669         /* Slot deletion case: we have to update the current slot */
670         spin_lock(&kvm->mmu_lock);
671         if (!npages)
672                 *memslot = old;
673         spin_unlock(&kvm->mmu_lock);
674 #ifdef CONFIG_DMAR
675         /* map the pages in iommu page table */
676         r = kvm_iommu_map_pages(kvm, base_gfn, npages);
677         if (r)
678                 goto out;
679 #endif
680         return 0;
681
682 out_free:
683         kvm_free_physmem_slot(&new, &old);
684 out:
685         return r;
686
687 }
688 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
689
690 int kvm_set_memory_region(struct kvm *kvm,
691                           struct kvm_userspace_memory_region *mem,
692                           int user_alloc)
693 {
694         int r;
695
696         down_write(&kvm->slots_lock);
697         r = __kvm_set_memory_region(kvm, mem, user_alloc);
698         up_write(&kvm->slots_lock);
699         return r;
700 }
701 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
702
703 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
704                                    struct
705                                    kvm_userspace_memory_region *mem,
706                                    int user_alloc)
707 {
708         if (mem->slot >= KVM_MEMORY_SLOTS)
709                 return -EINVAL;
710         return kvm_set_memory_region(kvm, mem, user_alloc);
711 }
712
713 int kvm_get_dirty_log(struct kvm *kvm,
714                         struct kvm_dirty_log *log, int *is_dirty)
715 {
716         struct kvm_memory_slot *memslot;
717         int r, i;
718         int n;
719         unsigned long any = 0;
720
721         r = -EINVAL;
722         if (log->slot >= KVM_MEMORY_SLOTS)
723                 goto out;
724
725         memslot = &kvm->memslots[log->slot];
726         r = -ENOENT;
727         if (!memslot->dirty_bitmap)
728                 goto out;
729
730         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
731
732         for (i = 0; !any && i < n/sizeof(long); ++i)
733                 any = memslot->dirty_bitmap[i];
734
735         r = -EFAULT;
736         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
737                 goto out;
738
739         if (any)
740                 *is_dirty = 1;
741
742         r = 0;
743 out:
744         return r;
745 }
746
747 void kvm_disable_largepages(void)
748 {
749         largepages_enabled = false;
750 }
751 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
752
753 int is_error_page(struct page *page)
754 {
755         return page == bad_page;
756 }
757 EXPORT_SYMBOL_GPL(is_error_page);
758
759 int is_error_pfn(pfn_t pfn)
760 {
761         return pfn == bad_pfn;
762 }
763 EXPORT_SYMBOL_GPL(is_error_pfn);
764
765 static inline unsigned long bad_hva(void)
766 {
767         return PAGE_OFFSET;
768 }
769
770 int kvm_is_error_hva(unsigned long addr)
771 {
772         return addr == bad_hva();
773 }
774 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
775
776 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
777 {
778         int i;
779
780         for (i = 0; i < kvm->nmemslots; ++i) {
781                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
782
783                 if (gfn >= memslot->base_gfn
784                     && gfn < memslot->base_gfn + memslot->npages)
785                         return memslot;
786         }
787         return NULL;
788 }
789 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
790
791 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
792 {
793         gfn = unalias_gfn(kvm, gfn);
794         return gfn_to_memslot_unaliased(kvm, gfn);
795 }
796
797 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
798 {
799         int i;
800
801         gfn = unalias_gfn(kvm, gfn);
802         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
803                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
804
805                 if (gfn >= memslot->base_gfn
806                     && gfn < memslot->base_gfn + memslot->npages)
807                         return 1;
808         }
809         return 0;
810 }
811 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
812
813 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
814 {
815         struct kvm_memory_slot *slot;
816
817         gfn = unalias_gfn(kvm, gfn);
818         slot = gfn_to_memslot_unaliased(kvm, gfn);
819         if (!slot)
820                 return bad_hva();
821         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
822 }
823 EXPORT_SYMBOL_GPL(gfn_to_hva);
824
825 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
826 {
827         struct page *page[1];
828         unsigned long addr;
829         int npages;
830         pfn_t pfn;
831
832         might_sleep();
833
834         addr = gfn_to_hva(kvm, gfn);
835         if (kvm_is_error_hva(addr)) {
836                 get_page(bad_page);
837                 return page_to_pfn(bad_page);
838         }
839
840         npages = get_user_pages_fast(addr, 1, 1, page);
841
842         if (unlikely(npages != 1)) {
843                 struct vm_area_struct *vma;
844
845                 down_read(&current->mm->mmap_sem);
846                 vma = find_vma(current->mm, addr);
847
848                 if (vma == NULL || addr < vma->vm_start ||
849                     !(vma->vm_flags & VM_PFNMAP)) {
850                         up_read(&current->mm->mmap_sem);
851                         get_page(bad_page);
852                         return page_to_pfn(bad_page);
853                 }
854
855                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
856                 up_read(&current->mm->mmap_sem);
857                 BUG_ON(!kvm_is_mmio_pfn(pfn));
858         } else
859                 pfn = page_to_pfn(page[0]);
860
861         return pfn;
862 }
863
864 EXPORT_SYMBOL_GPL(gfn_to_pfn);
865
866 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
867 {
868         pfn_t pfn;
869
870         pfn = gfn_to_pfn(kvm, gfn);
871         if (!kvm_is_mmio_pfn(pfn))
872                 return pfn_to_page(pfn);
873
874         WARN_ON(kvm_is_mmio_pfn(pfn));
875
876         get_page(bad_page);
877         return bad_page;
878 }
879
880 EXPORT_SYMBOL_GPL(gfn_to_page);
881
882 void kvm_release_page_clean(struct page *page)
883 {
884         kvm_release_pfn_clean(page_to_pfn(page));
885 }
886 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
887
888 void kvm_release_pfn_clean(pfn_t pfn)
889 {
890         if (!kvm_is_mmio_pfn(pfn))
891                 put_page(pfn_to_page(pfn));
892 }
893 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
894
895 void kvm_release_page_dirty(struct page *page)
896 {
897         kvm_release_pfn_dirty(page_to_pfn(page));
898 }
899 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
900
901 void kvm_release_pfn_dirty(pfn_t pfn)
902 {
903         kvm_set_pfn_dirty(pfn);
904         kvm_release_pfn_clean(pfn);
905 }
906 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
907
908 void kvm_set_page_dirty(struct page *page)
909 {
910         kvm_set_pfn_dirty(page_to_pfn(page));
911 }
912 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
913
914 void kvm_set_pfn_dirty(pfn_t pfn)
915 {
916         if (!kvm_is_mmio_pfn(pfn)) {
917                 struct page *page = pfn_to_page(pfn);
918                 if (!PageReserved(page))
919                         SetPageDirty(page);
920         }
921 }
922 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
923
924 void kvm_set_pfn_accessed(pfn_t pfn)
925 {
926         if (!kvm_is_mmio_pfn(pfn))
927                 mark_page_accessed(pfn_to_page(pfn));
928 }
929 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
930
931 void kvm_get_pfn(pfn_t pfn)
932 {
933         if (!kvm_is_mmio_pfn(pfn))
934                 get_page(pfn_to_page(pfn));
935 }
936 EXPORT_SYMBOL_GPL(kvm_get_pfn);
937
938 static int next_segment(unsigned long len, int offset)
939 {
940         if (len > PAGE_SIZE - offset)
941                 return PAGE_SIZE - offset;
942         else
943                 return len;
944 }
945
946 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
947                         int len)
948 {
949         int r;
950         unsigned long addr;
951
952         addr = gfn_to_hva(kvm, gfn);
953         if (kvm_is_error_hva(addr))
954                 return -EFAULT;
955         r = copy_from_user(data, (void __user *)addr + offset, len);
956         if (r)
957                 return -EFAULT;
958         return 0;
959 }
960 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
961
962 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
963 {
964         gfn_t gfn = gpa >> PAGE_SHIFT;
965         int seg;
966         int offset = offset_in_page(gpa);
967         int ret;
968
969         while ((seg = next_segment(len, offset)) != 0) {
970                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
971                 if (ret < 0)
972                         return ret;
973                 offset = 0;
974                 len -= seg;
975                 data += seg;
976                 ++gfn;
977         }
978         return 0;
979 }
980 EXPORT_SYMBOL_GPL(kvm_read_guest);
981
982 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
983                           unsigned long len)
984 {
985         int r;
986         unsigned long addr;
987         gfn_t gfn = gpa >> PAGE_SHIFT;
988         int offset = offset_in_page(gpa);
989
990         addr = gfn_to_hva(kvm, gfn);
991         if (kvm_is_error_hva(addr))
992                 return -EFAULT;
993         pagefault_disable();
994         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
995         pagefault_enable();
996         if (r)
997                 return -EFAULT;
998         return 0;
999 }
1000 EXPORT_SYMBOL(kvm_read_guest_atomic);
1001
1002 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1003                          int offset, int len)
1004 {
1005         int r;
1006         unsigned long addr;
1007
1008         addr = gfn_to_hva(kvm, gfn);
1009         if (kvm_is_error_hva(addr))
1010                 return -EFAULT;
1011         r = copy_to_user((void __user *)addr + offset, data, len);
1012         if (r)
1013                 return -EFAULT;
1014         mark_page_dirty(kvm, gfn);
1015         return 0;
1016 }
1017 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1018
1019 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1020                     unsigned long len)
1021 {
1022         gfn_t gfn = gpa >> PAGE_SHIFT;
1023         int seg;
1024         int offset = offset_in_page(gpa);
1025         int ret;
1026
1027         while ((seg = next_segment(len, offset)) != 0) {
1028                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1029                 if (ret < 0)
1030                         return ret;
1031                 offset = 0;
1032                 len -= seg;
1033                 data += seg;
1034                 ++gfn;
1035         }
1036         return 0;
1037 }
1038
1039 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1040 {
1041         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1042 }
1043 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1044
1045 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1046 {
1047         gfn_t gfn = gpa >> PAGE_SHIFT;
1048         int seg;
1049         int offset = offset_in_page(gpa);
1050         int ret;
1051
1052         while ((seg = next_segment(len, offset)) != 0) {
1053                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1054                 if (ret < 0)
1055                         return ret;
1056                 offset = 0;
1057                 len -= seg;
1058                 ++gfn;
1059         }
1060         return 0;
1061 }
1062 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1063
1064 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1065 {
1066         struct kvm_memory_slot *memslot;
1067
1068         gfn = unalias_gfn(kvm, gfn);
1069         memslot = gfn_to_memslot_unaliased(kvm, gfn);
1070         if (memslot && memslot->dirty_bitmap) {
1071                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1072
1073                 /* avoid RMW */
1074                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1075                         set_bit(rel_gfn, memslot->dirty_bitmap);
1076         }
1077 }
1078
1079 /*
1080  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1081  */
1082 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1083 {
1084         DEFINE_WAIT(wait);
1085
1086         for (;;) {
1087                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1088
1089                 if (kvm_arch_vcpu_runnable(vcpu)) {
1090                         set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1091                         break;
1092                 }
1093                 if (kvm_cpu_has_pending_timer(vcpu))
1094                         break;
1095                 if (signal_pending(current))
1096                         break;
1097
1098                 schedule();
1099         }
1100
1101         finish_wait(&vcpu->wq, &wait);
1102 }
1103
1104 void kvm_resched(struct kvm_vcpu *vcpu)
1105 {
1106         if (!need_resched())
1107                 return;
1108         cond_resched();
1109 }
1110 EXPORT_SYMBOL_GPL(kvm_resched);
1111
1112 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1113 {
1114         ktime_t expires;
1115         DEFINE_WAIT(wait);
1116
1117         prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1118
1119         /* Sleep for 100 us, and hope lock-holder got scheduled */
1120         expires = ktime_add_ns(ktime_get(), 100000UL);
1121         schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1122
1123         finish_wait(&vcpu->wq, &wait);
1124 }
1125 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1126
1127 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1128 {
1129         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1130         struct page *page;
1131
1132         if (vmf->pgoff == 0)
1133                 page = virt_to_page(vcpu->run);
1134 #ifdef CONFIG_X86
1135         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1136                 page = virt_to_page(vcpu->arch.pio_data);
1137 #endif
1138 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1139         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1140                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1141 #endif
1142         else
1143                 return VM_FAULT_SIGBUS;
1144         get_page(page);
1145         vmf->page = page;
1146         return 0;
1147 }
1148
1149 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1150         .fault = kvm_vcpu_fault,
1151 };
1152
1153 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1154 {
1155         vma->vm_ops = &kvm_vcpu_vm_ops;
1156         return 0;
1157 }
1158
1159 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1160 {
1161         struct kvm_vcpu *vcpu = filp->private_data;
1162
1163         kvm_put_kvm(vcpu->kvm);
1164         return 0;
1165 }
1166
1167 static struct file_operations kvm_vcpu_fops = {
1168         .release        = kvm_vcpu_release,
1169         .unlocked_ioctl = kvm_vcpu_ioctl,
1170         .compat_ioctl   = kvm_vcpu_ioctl,
1171         .mmap           = kvm_vcpu_mmap,
1172 };
1173
1174 /*
1175  * Allocates an inode for the vcpu.
1176  */
1177 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1178 {
1179         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1180 }
1181
1182 /*
1183  * Creates some virtual cpus.  Good luck creating more than one.
1184  */
1185 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1186 {
1187         int r;
1188         struct kvm_vcpu *vcpu, *v;
1189
1190         vcpu = kvm_arch_vcpu_create(kvm, id);
1191         if (IS_ERR(vcpu))
1192                 return PTR_ERR(vcpu);
1193
1194         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1195
1196         r = kvm_arch_vcpu_setup(vcpu);
1197         if (r)
1198                 return r;
1199
1200         mutex_lock(&kvm->lock);
1201         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1202                 r = -EINVAL;
1203                 goto vcpu_destroy;
1204         }
1205
1206         kvm_for_each_vcpu(r, v, kvm)
1207                 if (v->vcpu_id == id) {
1208                         r = -EEXIST;
1209                         goto vcpu_destroy;
1210                 }
1211
1212         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1213
1214         /* Now it's all set up, let userspace reach it */
1215         kvm_get_kvm(kvm);
1216         r = create_vcpu_fd(vcpu);
1217         if (r < 0) {
1218                 kvm_put_kvm(kvm);
1219                 goto vcpu_destroy;
1220         }
1221
1222         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1223         smp_wmb();
1224         atomic_inc(&kvm->online_vcpus);
1225
1226 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1227         if (kvm->bsp_vcpu_id == id)
1228                 kvm->bsp_vcpu = vcpu;
1229 #endif
1230         mutex_unlock(&kvm->lock);
1231         return r;
1232
1233 vcpu_destroy:
1234         mutex_unlock(&kvm->lock);
1235         kvm_arch_vcpu_destroy(vcpu);
1236         return r;
1237 }
1238
1239 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1240 {
1241         if (sigset) {
1242                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1243                 vcpu->sigset_active = 1;
1244                 vcpu->sigset = *sigset;
1245         } else
1246                 vcpu->sigset_active = 0;
1247         return 0;
1248 }
1249
1250 static long kvm_vcpu_ioctl(struct file *filp,
1251                            unsigned int ioctl, unsigned long arg)
1252 {
1253         struct kvm_vcpu *vcpu = filp->private_data;
1254         void __user *argp = (void __user *)arg;
1255         int r;
1256         struct kvm_fpu *fpu = NULL;
1257         struct kvm_sregs *kvm_sregs = NULL;
1258
1259         if (vcpu->kvm->mm != current->mm)
1260                 return -EIO;
1261         switch (ioctl) {
1262         case KVM_RUN:
1263                 r = -EINVAL;
1264                 if (arg)
1265                         goto out;
1266                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1267                 break;
1268         case KVM_GET_REGS: {
1269                 struct kvm_regs *kvm_regs;
1270
1271                 r = -ENOMEM;
1272                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1273                 if (!kvm_regs)
1274                         goto out;
1275                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1276                 if (r)
1277                         goto out_free1;
1278                 r = -EFAULT;
1279                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1280                         goto out_free1;
1281                 r = 0;
1282 out_free1:
1283                 kfree(kvm_regs);
1284                 break;
1285         }
1286         case KVM_SET_REGS: {
1287                 struct kvm_regs *kvm_regs;
1288
1289                 r = -ENOMEM;
1290                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1291                 if (!kvm_regs)
1292                         goto out;
1293                 r = -EFAULT;
1294                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1295                         goto out_free2;
1296                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1297                 if (r)
1298                         goto out_free2;
1299                 r = 0;
1300 out_free2:
1301                 kfree(kvm_regs);
1302                 break;
1303         }
1304         case KVM_GET_SREGS: {
1305                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1306                 r = -ENOMEM;
1307                 if (!kvm_sregs)
1308                         goto out;
1309                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1310                 if (r)
1311                         goto out;
1312                 r = -EFAULT;
1313                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1314                         goto out;
1315                 r = 0;
1316                 break;
1317         }
1318         case KVM_SET_SREGS: {
1319                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1320                 r = -ENOMEM;
1321                 if (!kvm_sregs)
1322                         goto out;
1323                 r = -EFAULT;
1324                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1325                         goto out;
1326                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1327                 if (r)
1328                         goto out;
1329                 r = 0;
1330                 break;
1331         }
1332         case KVM_GET_MP_STATE: {
1333                 struct kvm_mp_state mp_state;
1334
1335                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1336                 if (r)
1337                         goto out;
1338                 r = -EFAULT;
1339                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1340                         goto out;
1341                 r = 0;
1342                 break;
1343         }
1344         case KVM_SET_MP_STATE: {
1345                 struct kvm_mp_state mp_state;
1346
1347                 r = -EFAULT;
1348                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1349                         goto out;
1350                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1351                 if (r)
1352                         goto out;
1353                 r = 0;
1354                 break;
1355         }
1356         case KVM_TRANSLATE: {
1357                 struct kvm_translation tr;
1358
1359                 r = -EFAULT;
1360                 if (copy_from_user(&tr, argp, sizeof tr))
1361                         goto out;
1362                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1363                 if (r)
1364                         goto out;
1365                 r = -EFAULT;
1366                 if (copy_to_user(argp, &tr, sizeof tr))
1367                         goto out;
1368                 r = 0;
1369                 break;
1370         }
1371         case KVM_SET_GUEST_DEBUG: {
1372                 struct kvm_guest_debug dbg;
1373
1374                 r = -EFAULT;
1375                 if (copy_from_user(&dbg, argp, sizeof dbg))
1376                         goto out;
1377                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1378                 if (r)
1379                         goto out;
1380                 r = 0;
1381                 break;
1382         }
1383         case KVM_SET_SIGNAL_MASK: {
1384                 struct kvm_signal_mask __user *sigmask_arg = argp;
1385                 struct kvm_signal_mask kvm_sigmask;
1386                 sigset_t sigset, *p;
1387
1388                 p = NULL;
1389                 if (argp) {
1390                         r = -EFAULT;
1391                         if (copy_from_user(&kvm_sigmask, argp,
1392                                            sizeof kvm_sigmask))
1393                                 goto out;
1394                         r = -EINVAL;
1395                         if (kvm_sigmask.len != sizeof sigset)
1396                                 goto out;
1397                         r = -EFAULT;
1398                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1399                                            sizeof sigset))
1400                                 goto out;
1401                         p = &sigset;
1402                 }
1403                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1404                 break;
1405         }
1406         case KVM_GET_FPU: {
1407                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1408                 r = -ENOMEM;
1409                 if (!fpu)
1410                         goto out;
1411                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1412                 if (r)
1413                         goto out;
1414                 r = -EFAULT;
1415                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1416                         goto out;
1417                 r = 0;
1418                 break;
1419         }
1420         case KVM_SET_FPU: {
1421                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1422                 r = -ENOMEM;
1423                 if (!fpu)
1424                         goto out;
1425                 r = -EFAULT;
1426                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1427                         goto out;
1428                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1429                 if (r)
1430                         goto out;
1431                 r = 0;
1432                 break;
1433         }
1434         default:
1435                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1436         }
1437 out:
1438         kfree(fpu);
1439         kfree(kvm_sregs);
1440         return r;
1441 }
1442
1443 static long kvm_vm_ioctl(struct file *filp,
1444                            unsigned int ioctl, unsigned long arg)
1445 {
1446         struct kvm *kvm = filp->private_data;
1447         void __user *argp = (void __user *)arg;
1448         int r;
1449
1450         if (kvm->mm != current->mm)
1451                 return -EIO;
1452         switch (ioctl) {
1453         case KVM_CREATE_VCPU:
1454                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1455                 if (r < 0)
1456                         goto out;
1457                 break;
1458         case KVM_SET_USER_MEMORY_REGION: {
1459                 struct kvm_userspace_memory_region kvm_userspace_mem;
1460
1461                 r = -EFAULT;
1462                 if (copy_from_user(&kvm_userspace_mem, argp,
1463                                                 sizeof kvm_userspace_mem))
1464                         goto out;
1465
1466                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1467                 if (r)
1468                         goto out;
1469                 break;
1470         }
1471         case KVM_GET_DIRTY_LOG: {
1472                 struct kvm_dirty_log log;
1473
1474                 r = -EFAULT;
1475                 if (copy_from_user(&log, argp, sizeof log))
1476                         goto out;
1477                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1478                 if (r)
1479                         goto out;
1480                 break;
1481         }
1482 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1483         case KVM_REGISTER_COALESCED_MMIO: {
1484                 struct kvm_coalesced_mmio_zone zone;
1485                 r = -EFAULT;
1486                 if (copy_from_user(&zone, argp, sizeof zone))
1487                         goto out;
1488                 r = -ENXIO;
1489                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1490                 if (r)
1491                         goto out;
1492                 r = 0;
1493                 break;
1494         }
1495         case KVM_UNREGISTER_COALESCED_MMIO: {
1496                 struct kvm_coalesced_mmio_zone zone;
1497                 r = -EFAULT;
1498                 if (copy_from_user(&zone, argp, sizeof zone))
1499                         goto out;
1500                 r = -ENXIO;
1501                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1502                 if (r)
1503                         goto out;
1504                 r = 0;
1505                 break;
1506         }
1507 #endif
1508         case KVM_IRQFD: {
1509                 struct kvm_irqfd data;
1510
1511                 r = -EFAULT;
1512                 if (copy_from_user(&data, argp, sizeof data))
1513                         goto out;
1514                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1515                 break;
1516         }
1517         case KVM_IOEVENTFD: {
1518                 struct kvm_ioeventfd data;
1519
1520                 r = -EFAULT;
1521                 if (copy_from_user(&data, argp, sizeof data))
1522                         goto out;
1523                 r = kvm_ioeventfd(kvm, &data);
1524                 break;
1525         }
1526 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1527         case KVM_SET_BOOT_CPU_ID:
1528                 r = 0;
1529                 mutex_lock(&kvm->lock);
1530                 if (atomic_read(&kvm->online_vcpus) != 0)
1531                         r = -EBUSY;
1532                 else
1533                         kvm->bsp_vcpu_id = arg;
1534                 mutex_unlock(&kvm->lock);
1535                 break;
1536 #endif
1537         default:
1538                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1539                 if (r == -ENOTTY)
1540                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1541         }
1542 out:
1543         return r;
1544 }
1545
1546 #ifdef CONFIG_COMPAT
1547 struct compat_kvm_dirty_log {
1548         __u32 slot;
1549         __u32 padding1;
1550         union {
1551                 compat_uptr_t dirty_bitmap; /* one bit per page */
1552                 __u64 padding2;
1553         };
1554 };
1555
1556 static long kvm_vm_compat_ioctl(struct file *filp,
1557                            unsigned int ioctl, unsigned long arg)
1558 {
1559         struct kvm *kvm = filp->private_data;
1560         int r;
1561
1562         if (kvm->mm != current->mm)
1563                 return -EIO;
1564         switch (ioctl) {
1565         case KVM_GET_DIRTY_LOG: {
1566                 struct compat_kvm_dirty_log compat_log;
1567                 struct kvm_dirty_log log;
1568
1569                 r = -EFAULT;
1570                 if (copy_from_user(&compat_log, (void __user *)arg,
1571                                    sizeof(compat_log)))
1572                         goto out;
1573                 log.slot         = compat_log.slot;
1574                 log.padding1     = compat_log.padding1;
1575                 log.padding2     = compat_log.padding2;
1576                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1577
1578                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1579                 if (r)
1580                         goto out;
1581                 break;
1582         }
1583         default:
1584                 r = kvm_vm_ioctl(filp, ioctl, arg);
1585         }
1586
1587 out:
1588         return r;
1589 }
1590 #endif
1591
1592 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1593 {
1594         struct page *page[1];
1595         unsigned long addr;
1596         int npages;
1597         gfn_t gfn = vmf->pgoff;
1598         struct kvm *kvm = vma->vm_file->private_data;
1599
1600         addr = gfn_to_hva(kvm, gfn);
1601         if (kvm_is_error_hva(addr))
1602                 return VM_FAULT_SIGBUS;
1603
1604         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1605                                 NULL);
1606         if (unlikely(npages != 1))
1607                 return VM_FAULT_SIGBUS;
1608
1609         vmf->page = page[0];
1610         return 0;
1611 }
1612
1613 static const struct vm_operations_struct kvm_vm_vm_ops = {
1614         .fault = kvm_vm_fault,
1615 };
1616
1617 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1618 {
1619         vma->vm_ops = &kvm_vm_vm_ops;
1620         return 0;
1621 }
1622
1623 static struct file_operations kvm_vm_fops = {
1624         .release        = kvm_vm_release,
1625         .unlocked_ioctl = kvm_vm_ioctl,
1626 #ifdef CONFIG_COMPAT
1627         .compat_ioctl   = kvm_vm_compat_ioctl,
1628 #endif
1629         .mmap           = kvm_vm_mmap,
1630 };
1631
1632 static int kvm_dev_ioctl_create_vm(void)
1633 {
1634         int fd;
1635         struct kvm *kvm;
1636
1637         kvm = kvm_create_vm();
1638         if (IS_ERR(kvm))
1639                 return PTR_ERR(kvm);
1640         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1641         if (fd < 0)
1642                 kvm_put_kvm(kvm);
1643
1644         return fd;
1645 }
1646
1647 static long kvm_dev_ioctl_check_extension_generic(long arg)
1648 {
1649         switch (arg) {
1650         case KVM_CAP_USER_MEMORY:
1651         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1652         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1653 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1654         case KVM_CAP_SET_BOOT_CPU_ID:
1655 #endif
1656         case KVM_CAP_INTERNAL_ERROR_DATA:
1657                 return 1;
1658 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1659         case KVM_CAP_IRQ_ROUTING:
1660                 return KVM_MAX_IRQ_ROUTES;
1661 #endif
1662         default:
1663                 break;
1664         }
1665         return kvm_dev_ioctl_check_extension(arg);
1666 }
1667
1668 static long kvm_dev_ioctl(struct file *filp,
1669                           unsigned int ioctl, unsigned long arg)
1670 {
1671         long r = -EINVAL;
1672
1673         switch (ioctl) {
1674         case KVM_GET_API_VERSION:
1675                 r = -EINVAL;
1676                 if (arg)
1677                         goto out;
1678                 r = KVM_API_VERSION;
1679                 break;
1680         case KVM_CREATE_VM:
1681                 r = -EINVAL;
1682                 if (arg)
1683                         goto out;
1684                 r = kvm_dev_ioctl_create_vm();
1685                 break;
1686         case KVM_CHECK_EXTENSION:
1687                 r = kvm_dev_ioctl_check_extension_generic(arg);
1688                 break;
1689         case KVM_GET_VCPU_MMAP_SIZE:
1690                 r = -EINVAL;
1691                 if (arg)
1692                         goto out;
1693                 r = PAGE_SIZE;     /* struct kvm_run */
1694 #ifdef CONFIG_X86
1695                 r += PAGE_SIZE;    /* pio data page */
1696 #endif
1697 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1698                 r += PAGE_SIZE;    /* coalesced mmio ring page */
1699 #endif
1700                 break;
1701         case KVM_TRACE_ENABLE:
1702         case KVM_TRACE_PAUSE:
1703         case KVM_TRACE_DISABLE:
1704                 r = -EOPNOTSUPP;
1705                 break;
1706         default:
1707                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1708         }
1709 out:
1710         return r;
1711 }
1712
1713 static struct file_operations kvm_chardev_ops = {
1714         .unlocked_ioctl = kvm_dev_ioctl,
1715         .compat_ioctl   = kvm_dev_ioctl,
1716 };
1717
1718 static struct miscdevice kvm_dev = {
1719         KVM_MINOR,
1720         "kvm",
1721         &kvm_chardev_ops,
1722 };
1723
1724 static void hardware_enable(void *junk)
1725 {
1726         int cpu = raw_smp_processor_id();
1727         int r;
1728
1729         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1730                 return;
1731
1732         cpumask_set_cpu(cpu, cpus_hardware_enabled);
1733
1734         r = kvm_arch_hardware_enable(NULL);
1735
1736         if (r) {
1737                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1738                 atomic_inc(&hardware_enable_failed);
1739                 printk(KERN_INFO "kvm: enabling virtualization on "
1740                                  "CPU%d failed\n", cpu);
1741         }
1742 }
1743
1744 static void hardware_disable(void *junk)
1745 {
1746         int cpu = raw_smp_processor_id();
1747
1748         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1749                 return;
1750         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1751         kvm_arch_hardware_disable(NULL);
1752 }
1753
1754 static void hardware_disable_all_nolock(void)
1755 {
1756         BUG_ON(!kvm_usage_count);
1757
1758         kvm_usage_count--;
1759         if (!kvm_usage_count)
1760                 on_each_cpu(hardware_disable, NULL, 1);
1761 }
1762
1763 static void hardware_disable_all(void)
1764 {
1765         spin_lock(&kvm_lock);
1766         hardware_disable_all_nolock();
1767         spin_unlock(&kvm_lock);
1768 }
1769
1770 static int hardware_enable_all(void)
1771 {
1772         int r = 0;
1773
1774         spin_lock(&kvm_lock);
1775
1776         kvm_usage_count++;
1777         if (kvm_usage_count == 1) {
1778                 atomic_set(&hardware_enable_failed, 0);
1779                 on_each_cpu(hardware_enable, NULL, 1);
1780
1781                 if (atomic_read(&hardware_enable_failed)) {
1782                         hardware_disable_all_nolock();
1783                         r = -EBUSY;
1784                 }
1785         }
1786
1787         spin_unlock(&kvm_lock);
1788
1789         return r;
1790 }
1791
1792 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1793                            void *v)
1794 {
1795         int cpu = (long)v;
1796
1797         if (!kvm_usage_count)
1798                 return NOTIFY_OK;
1799
1800         val &= ~CPU_TASKS_FROZEN;
1801         switch (val) {
1802         case CPU_DYING:
1803                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1804                        cpu);
1805                 hardware_disable(NULL);
1806                 break;
1807         case CPU_UP_CANCELED:
1808                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1809                        cpu);
1810                 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1811                 break;
1812         case CPU_ONLINE:
1813                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1814                        cpu);
1815                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1816                 break;
1817         }
1818         return NOTIFY_OK;
1819 }
1820
1821
1822 asmlinkage void kvm_handle_fault_on_reboot(void)
1823 {
1824         if (kvm_rebooting)
1825                 /* spin while reset goes on */
1826                 while (true)
1827                         ;
1828         /* Fault while not rebooting.  We want the trace. */
1829         BUG();
1830 }
1831 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1832
1833 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1834                       void *v)
1835 {
1836         /*
1837          * Some (well, at least mine) BIOSes hang on reboot if
1838          * in vmx root mode.
1839          *
1840          * And Intel TXT required VMX off for all cpu when system shutdown.
1841          */
1842         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1843         kvm_rebooting = true;
1844         on_each_cpu(hardware_disable, NULL, 1);
1845         return NOTIFY_OK;
1846 }
1847
1848 static struct notifier_block kvm_reboot_notifier = {
1849         .notifier_call = kvm_reboot,
1850         .priority = 0,
1851 };
1852
1853 void kvm_io_bus_init(struct kvm_io_bus *bus)
1854 {
1855         memset(bus, 0, sizeof(*bus));
1856 }
1857
1858 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1859 {
1860         int i;
1861
1862         for (i = 0; i < bus->dev_count; i++) {
1863                 struct kvm_io_device *pos = bus->devs[i];
1864
1865                 kvm_iodevice_destructor(pos);
1866         }
1867 }
1868
1869 /* kvm_io_bus_write - called under kvm->slots_lock */
1870 int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
1871                      int len, const void *val)
1872 {
1873         int i;
1874         for (i = 0; i < bus->dev_count; i++)
1875                 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
1876                         return 0;
1877         return -EOPNOTSUPP;
1878 }
1879
1880 /* kvm_io_bus_read - called under kvm->slots_lock */
1881 int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
1882 {
1883         int i;
1884         for (i = 0; i < bus->dev_count; i++)
1885                 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
1886                         return 0;
1887         return -EOPNOTSUPP;
1888 }
1889
1890 int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
1891                              struct kvm_io_device *dev)
1892 {
1893         int ret;
1894
1895         down_write(&kvm->slots_lock);
1896         ret = __kvm_io_bus_register_dev(bus, dev);
1897         up_write(&kvm->slots_lock);
1898
1899         return ret;
1900 }
1901
1902 /* An unlocked version. Caller must have write lock on slots_lock. */
1903 int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
1904                               struct kvm_io_device *dev)
1905 {
1906         if (bus->dev_count > NR_IOBUS_DEVS-1)
1907                 return -ENOSPC;
1908
1909         bus->devs[bus->dev_count++] = dev;
1910
1911         return 0;
1912 }
1913
1914 void kvm_io_bus_unregister_dev(struct kvm *kvm,
1915                                struct kvm_io_bus *bus,
1916                                struct kvm_io_device *dev)
1917 {
1918         down_write(&kvm->slots_lock);
1919         __kvm_io_bus_unregister_dev(bus, dev);
1920         up_write(&kvm->slots_lock);
1921 }
1922
1923 /* An unlocked version. Caller must have write lock on slots_lock. */
1924 void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
1925                                  struct kvm_io_device *dev)
1926 {
1927         int i;
1928
1929         for (i = 0; i < bus->dev_count; i++)
1930                 if (bus->devs[i] == dev) {
1931                         bus->devs[i] = bus->devs[--bus->dev_count];
1932                         break;
1933                 }
1934 }
1935
1936 static struct notifier_block kvm_cpu_notifier = {
1937         .notifier_call = kvm_cpu_hotplug,
1938         .priority = 20, /* must be > scheduler priority */
1939 };
1940
1941 static int vm_stat_get(void *_offset, u64 *val)
1942 {
1943         unsigned offset = (long)_offset;
1944         struct kvm *kvm;
1945
1946         *val = 0;
1947         spin_lock(&kvm_lock);
1948         list_for_each_entry(kvm, &vm_list, vm_list)
1949                 *val += *(u32 *)((void *)kvm + offset);
1950         spin_unlock(&kvm_lock);
1951         return 0;
1952 }
1953
1954 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1955
1956 static int vcpu_stat_get(void *_offset, u64 *val)
1957 {
1958         unsigned offset = (long)_offset;
1959         struct kvm *kvm;
1960         struct kvm_vcpu *vcpu;
1961         int i;
1962
1963         *val = 0;
1964         spin_lock(&kvm_lock);
1965         list_for_each_entry(kvm, &vm_list, vm_list)
1966                 kvm_for_each_vcpu(i, vcpu, kvm)
1967                         *val += *(u32 *)((void *)vcpu + offset);
1968
1969         spin_unlock(&kvm_lock);
1970         return 0;
1971 }
1972
1973 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1974
1975 static const struct file_operations *stat_fops[] = {
1976         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1977         [KVM_STAT_VM]   = &vm_stat_fops,
1978 };
1979
1980 static void kvm_init_debug(void)
1981 {
1982         struct kvm_stats_debugfs_item *p;
1983
1984         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
1985         for (p = debugfs_entries; p->name; ++p)
1986                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
1987                                                 (void *)(long)p->offset,
1988                                                 stat_fops[p->kind]);
1989 }
1990
1991 static void kvm_exit_debug(void)
1992 {
1993         struct kvm_stats_debugfs_item *p;
1994
1995         for (p = debugfs_entries; p->name; ++p)
1996                 debugfs_remove(p->dentry);
1997         debugfs_remove(kvm_debugfs_dir);
1998 }
1999
2000 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2001 {
2002         if (kvm_usage_count)
2003                 hardware_disable(NULL);
2004         return 0;
2005 }
2006
2007 static int kvm_resume(struct sys_device *dev)
2008 {
2009         if (kvm_usage_count)
2010                 hardware_enable(NULL);
2011         return 0;
2012 }
2013
2014 static struct sysdev_class kvm_sysdev_class = {
2015         .name = "kvm",
2016         .suspend = kvm_suspend,
2017         .resume = kvm_resume,
2018 };
2019
2020 static struct sys_device kvm_sysdev = {
2021         .id = 0,
2022         .cls = &kvm_sysdev_class,
2023 };
2024
2025 struct page *bad_page;
2026 pfn_t bad_pfn;
2027
2028 static inline
2029 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2030 {
2031         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2032 }
2033
2034 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2035 {
2036         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2037
2038         kvm_arch_vcpu_load(vcpu, cpu);
2039 }
2040
2041 static void kvm_sched_out(struct preempt_notifier *pn,
2042                           struct task_struct *next)
2043 {
2044         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2045
2046         kvm_arch_vcpu_put(vcpu);
2047 }
2048
2049 int kvm_init(void *opaque, unsigned int vcpu_size,
2050                   struct module *module)
2051 {
2052         int r;
2053         int cpu;
2054
2055         r = kvm_arch_init(opaque);
2056         if (r)
2057                 goto out_fail;
2058
2059         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2060
2061         if (bad_page == NULL) {
2062                 r = -ENOMEM;
2063                 goto out;
2064         }
2065
2066         bad_pfn = page_to_pfn(bad_page);
2067
2068         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2069                 r = -ENOMEM;
2070                 goto out_free_0;
2071         }
2072
2073         r = kvm_arch_hardware_setup();
2074         if (r < 0)
2075                 goto out_free_0a;
2076
2077         for_each_online_cpu(cpu) {
2078                 smp_call_function_single(cpu,
2079                                 kvm_arch_check_processor_compat,
2080                                 &r, 1);
2081                 if (r < 0)
2082                         goto out_free_1;
2083         }
2084
2085         r = register_cpu_notifier(&kvm_cpu_notifier);
2086         if (r)
2087                 goto out_free_2;
2088         register_reboot_notifier(&kvm_reboot_notifier);
2089
2090         r = sysdev_class_register(&kvm_sysdev_class);
2091         if (r)
2092                 goto out_free_3;
2093
2094         r = sysdev_register(&kvm_sysdev);
2095         if (r)
2096                 goto out_free_4;
2097
2098         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2099         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2100                                            __alignof__(struct kvm_vcpu),
2101                                            0, NULL);
2102         if (!kvm_vcpu_cache) {
2103                 r = -ENOMEM;
2104                 goto out_free_5;
2105         }
2106
2107         kvm_chardev_ops.owner = module;
2108         kvm_vm_fops.owner = module;
2109         kvm_vcpu_fops.owner = module;
2110
2111         r = misc_register(&kvm_dev);
2112         if (r) {
2113                 printk(KERN_ERR "kvm: misc device register failed\n");
2114                 goto out_free;
2115         }
2116
2117         kvm_preempt_ops.sched_in = kvm_sched_in;
2118         kvm_preempt_ops.sched_out = kvm_sched_out;
2119
2120         kvm_init_debug();
2121
2122         return 0;
2123
2124 out_free:
2125         kmem_cache_destroy(kvm_vcpu_cache);
2126 out_free_5:
2127         sysdev_unregister(&kvm_sysdev);
2128 out_free_4:
2129         sysdev_class_unregister(&kvm_sysdev_class);
2130 out_free_3:
2131         unregister_reboot_notifier(&kvm_reboot_notifier);
2132         unregister_cpu_notifier(&kvm_cpu_notifier);
2133 out_free_2:
2134 out_free_1:
2135         kvm_arch_hardware_unsetup();
2136 out_free_0a:
2137         free_cpumask_var(cpus_hardware_enabled);
2138 out_free_0:
2139         __free_page(bad_page);
2140 out:
2141         kvm_arch_exit();
2142 out_fail:
2143         return r;
2144 }
2145 EXPORT_SYMBOL_GPL(kvm_init);
2146
2147 void kvm_exit(void)
2148 {
2149         tracepoint_synchronize_unregister();
2150         kvm_exit_debug();
2151         misc_deregister(&kvm_dev);
2152         kmem_cache_destroy(kvm_vcpu_cache);
2153         sysdev_unregister(&kvm_sysdev);
2154         sysdev_class_unregister(&kvm_sysdev_class);
2155         unregister_reboot_notifier(&kvm_reboot_notifier);
2156         unregister_cpu_notifier(&kvm_cpu_notifier);
2157         on_each_cpu(hardware_disable, NULL, 1);
2158         kvm_arch_hardware_unsetup();
2159         kvm_arch_exit();
2160         free_cpumask_var(cpus_hardware_enabled);
2161         __free_page(bad_page);
2162 }
2163 EXPORT_SYMBOL_GPL(kvm_exit);