d617f69131d7667d3847c7e0fc040a717625bf38
[linux-3.10.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  * 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         long 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
293         kvm->mmu_notifier_seq++;
294         need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
295         /* we've to flush the tlb before the pages can be freed */
296         if (need_tlb_flush)
297                 kvm_flush_remote_tlbs(kvm);
298
299         spin_unlock(&kvm->mmu_lock);
300         srcu_read_unlock(&kvm->srcu, idx);
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         /* we've to flush the tlb before the pages can be freed */
339         if (need_tlb_flush)
340                 kvm_flush_remote_tlbs(kvm);
341
342         spin_unlock(&kvm->mmu_lock);
343         srcu_read_unlock(&kvm->srcu, idx);
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         smp_wmb();
361         /*
362          * The above sequence increase must be visible before the
363          * below count decrease, which is ensured by the smp_wmb above
364          * in conjunction with the smp_rmb in mmu_notifier_retry().
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
382         young = kvm_age_hva(kvm, address);
383         if (young)
384                 kvm_flush_remote_tlbs(kvm);
385
386         spin_unlock(&kvm->mmu_lock);
387         srcu_read_unlock(&kvm->srcu, idx);
388
389         return young;
390 }
391
392 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
393                                        struct mm_struct *mm,
394                                        unsigned long address)
395 {
396         struct kvm *kvm = mmu_notifier_to_kvm(mn);
397         int young, idx;
398
399         idx = srcu_read_lock(&kvm->srcu);
400         spin_lock(&kvm->mmu_lock);
401         young = kvm_test_age_hva(kvm, address);
402         spin_unlock(&kvm->mmu_lock);
403         srcu_read_unlock(&kvm->srcu, idx);
404
405         return young;
406 }
407
408 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
409                                      struct mm_struct *mm)
410 {
411         struct kvm *kvm = mmu_notifier_to_kvm(mn);
412         int idx;
413
414         idx = srcu_read_lock(&kvm->srcu);
415         kvm_arch_flush_shadow(kvm);
416         srcu_read_unlock(&kvm->srcu, idx);
417 }
418
419 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
420         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
421         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
422         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
423         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
424         .test_young             = kvm_mmu_notifier_test_young,
425         .change_pte             = kvm_mmu_notifier_change_pte,
426         .release                = kvm_mmu_notifier_release,
427 };
428
429 static int kvm_init_mmu_notifier(struct kvm *kvm)
430 {
431         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
432         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
433 }
434
435 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
436
437 static int kvm_init_mmu_notifier(struct kvm *kvm)
438 {
439         return 0;
440 }
441
442 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
443
444 static void kvm_init_memslots_id(struct kvm *kvm)
445 {
446         int i;
447         struct kvm_memslots *slots = kvm->memslots;
448
449         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
450                 slots->id_to_index[i] = slots->memslots[i].id = i;
451 }
452
453 static struct kvm *kvm_create_vm(unsigned long type)
454 {
455         int r, i;
456         struct kvm *kvm = kvm_arch_alloc_vm();
457
458         if (!kvm)
459                 return ERR_PTR(-ENOMEM);
460
461         r = kvm_arch_init_vm(kvm, type);
462         if (r)
463                 goto out_err_nodisable;
464
465         r = hardware_enable_all();
466         if (r)
467                 goto out_err_nodisable;
468
469 #ifdef CONFIG_HAVE_KVM_IRQCHIP
470         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
471         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
472 #endif
473
474         r = -ENOMEM;
475         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
476         if (!kvm->memslots)
477                 goto out_err_nosrcu;
478         kvm_init_memslots_id(kvm);
479         if (init_srcu_struct(&kvm->srcu))
480                 goto out_err_nosrcu;
481         for (i = 0; i < KVM_NR_BUSES; i++) {
482                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
483                                         GFP_KERNEL);
484                 if (!kvm->buses[i])
485                         goto out_err;
486         }
487
488         spin_lock_init(&kvm->mmu_lock);
489         kvm->mm = current->mm;
490         atomic_inc(&kvm->mm->mm_count);
491         kvm_eventfd_init(kvm);
492         mutex_init(&kvm->lock);
493         mutex_init(&kvm->irq_lock);
494         mutex_init(&kvm->slots_lock);
495         atomic_set(&kvm->users_count, 1);
496
497         r = kvm_init_mmu_notifier(kvm);
498         if (r)
499                 goto out_err;
500
501         raw_spin_lock(&kvm_lock);
502         list_add(&kvm->vm_list, &vm_list);
503         raw_spin_unlock(&kvm_lock);
504
505         return kvm;
506
507 out_err:
508         cleanup_srcu_struct(&kvm->srcu);
509 out_err_nosrcu:
510         hardware_disable_all();
511 out_err_nodisable:
512         for (i = 0; i < KVM_NR_BUSES; i++)
513                 kfree(kvm->buses[i]);
514         kfree(kvm->memslots);
515         kvm_arch_free_vm(kvm);
516         return ERR_PTR(r);
517 }
518
519 /*
520  * Avoid using vmalloc for a small buffer.
521  * Should not be used when the size is statically known.
522  */
523 void *kvm_kvzalloc(unsigned long size)
524 {
525         if (size > PAGE_SIZE)
526                 return vzalloc(size);
527         else
528                 return kzalloc(size, GFP_KERNEL);
529 }
530
531 void kvm_kvfree(const void *addr)
532 {
533         if (is_vmalloc_addr(addr))
534                 vfree(addr);
535         else
536                 kfree(addr);
537 }
538
539 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
540 {
541         if (!memslot->dirty_bitmap)
542                 return;
543
544         kvm_kvfree(memslot->dirty_bitmap);
545         memslot->dirty_bitmap = NULL;
546 }
547
548 /*
549  * Free any memory in @free but not in @dont.
550  */
551 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
552                                   struct kvm_memory_slot *dont)
553 {
554         if (!dont || free->rmap != dont->rmap)
555                 vfree(free->rmap);
556
557         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
558                 kvm_destroy_dirty_bitmap(free);
559
560         kvm_arch_free_memslot(free, dont);
561
562         free->npages = 0;
563         free->rmap = NULL;
564 }
565
566 void kvm_free_physmem(struct kvm *kvm)
567 {
568         struct kvm_memslots *slots = kvm->memslots;
569         struct kvm_memory_slot *memslot;
570
571         kvm_for_each_memslot(memslot, slots)
572                 kvm_free_physmem_slot(memslot, NULL);
573
574         kfree(kvm->memslots);
575 }
576
577 static void kvm_destroy_vm(struct kvm *kvm)
578 {
579         int i;
580         struct mm_struct *mm = kvm->mm;
581
582         kvm_arch_sync_events(kvm);
583         raw_spin_lock(&kvm_lock);
584         list_del(&kvm->vm_list);
585         raw_spin_unlock(&kvm_lock);
586         kvm_free_irq_routing(kvm);
587         for (i = 0; i < KVM_NR_BUSES; i++)
588                 kvm_io_bus_destroy(kvm->buses[i]);
589         kvm_coalesced_mmio_free(kvm);
590 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
591         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
592 #else
593         kvm_arch_flush_shadow(kvm);
594 #endif
595         kvm_arch_destroy_vm(kvm);
596         kvm_free_physmem(kvm);
597         cleanup_srcu_struct(&kvm->srcu);
598         kvm_arch_free_vm(kvm);
599         hardware_disable_all();
600         mmdrop(mm);
601 }
602
603 void kvm_get_kvm(struct kvm *kvm)
604 {
605         atomic_inc(&kvm->users_count);
606 }
607 EXPORT_SYMBOL_GPL(kvm_get_kvm);
608
609 void kvm_put_kvm(struct kvm *kvm)
610 {
611         if (atomic_dec_and_test(&kvm->users_count))
612                 kvm_destroy_vm(kvm);
613 }
614 EXPORT_SYMBOL_GPL(kvm_put_kvm);
615
616
617 static int kvm_vm_release(struct inode *inode, struct file *filp)
618 {
619         struct kvm *kvm = filp->private_data;
620
621         kvm_irqfd_release(kvm);
622
623         kvm_put_kvm(kvm);
624         return 0;
625 }
626
627 /*
628  * Allocation size is twice as large as the actual dirty bitmap size.
629  * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
630  */
631 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
632 {
633 #ifndef CONFIG_S390
634         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
635
636         memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
637         if (!memslot->dirty_bitmap)
638                 return -ENOMEM;
639
640 #endif /* !CONFIG_S390 */
641         return 0;
642 }
643
644 static int cmp_memslot(const void *slot1, const void *slot2)
645 {
646         struct kvm_memory_slot *s1, *s2;
647
648         s1 = (struct kvm_memory_slot *)slot1;
649         s2 = (struct kvm_memory_slot *)slot2;
650
651         if (s1->npages < s2->npages)
652                 return 1;
653         if (s1->npages > s2->npages)
654                 return -1;
655
656         return 0;
657 }
658
659 /*
660  * Sort the memslots base on its size, so the larger slots
661  * will get better fit.
662  */
663 static void sort_memslots(struct kvm_memslots *slots)
664 {
665         int i;
666
667         sort(slots->memslots, KVM_MEM_SLOTS_NUM,
668               sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
669
670         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
671                 slots->id_to_index[slots->memslots[i].id] = i;
672 }
673
674 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
675 {
676         if (new) {
677                 int id = new->id;
678                 struct kvm_memory_slot *old = id_to_memslot(slots, id);
679                 unsigned long npages = old->npages;
680
681                 *old = *new;
682                 if (new->npages != npages)
683                         sort_memslots(slots);
684         }
685
686         slots->generation++;
687 }
688
689 /*
690  * Allocate some memory and give it an address in the guest physical address
691  * space.
692  *
693  * Discontiguous memory is allowed, mostly for framebuffers.
694  *
695  * Must be called holding mmap_sem for write.
696  */
697 int __kvm_set_memory_region(struct kvm *kvm,
698                             struct kvm_userspace_memory_region *mem,
699                             int user_alloc)
700 {
701         int r;
702         gfn_t base_gfn;
703         unsigned long npages;
704         unsigned long i;
705         struct kvm_memory_slot *memslot;
706         struct kvm_memory_slot old, new;
707         struct kvm_memslots *slots, *old_memslots;
708
709         r = -EINVAL;
710         /* General sanity checks */
711         if (mem->memory_size & (PAGE_SIZE - 1))
712                 goto out;
713         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
714                 goto out;
715         /* We can read the guest memory with __xxx_user() later on. */
716         if (user_alloc &&
717             ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
718              !access_ok(VERIFY_WRITE,
719                         (void __user *)(unsigned long)mem->userspace_addr,
720                         mem->memory_size)))
721                 goto out;
722         if (mem->slot >= KVM_MEM_SLOTS_NUM)
723                 goto out;
724         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
725                 goto out;
726
727         memslot = id_to_memslot(kvm->memslots, mem->slot);
728         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
729         npages = mem->memory_size >> PAGE_SHIFT;
730
731         r = -EINVAL;
732         if (npages > KVM_MEM_MAX_NR_PAGES)
733                 goto out;
734
735         if (!npages)
736                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
737
738         new = old = *memslot;
739
740         new.id = mem->slot;
741         new.base_gfn = base_gfn;
742         new.npages = npages;
743         new.flags = mem->flags;
744
745         /* Disallow changing a memory slot's size. */
746         r = -EINVAL;
747         if (npages && old.npages && npages != old.npages)
748                 goto out_free;
749
750         /* Check for overlaps */
751         r = -EEXIST;
752         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
753                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
754
755                 if (s == memslot || !s->npages)
756                         continue;
757                 if (!((base_gfn + npages <= s->base_gfn) ||
758                       (base_gfn >= s->base_gfn + s->npages)))
759                         goto out_free;
760         }
761
762         /* Free page dirty bitmap if unneeded */
763         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
764                 new.dirty_bitmap = NULL;
765
766         r = -ENOMEM;
767
768         /* Allocate if a slot is being created */
769         if (npages && !old.npages) {
770                 new.user_alloc = user_alloc;
771                 new.userspace_addr = mem->userspace_addr;
772 #ifndef CONFIG_S390
773                 new.rmap = vzalloc(npages * sizeof(*new.rmap));
774                 if (!new.rmap)
775                         goto out_free;
776 #endif /* not defined CONFIG_S390 */
777                 if (kvm_arch_create_memslot(&new, npages))
778                         goto out_free;
779         }
780
781         /* Allocate page dirty bitmap if needed */
782         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
783                 if (kvm_create_dirty_bitmap(&new) < 0)
784                         goto out_free;
785                 /* destroy any largepage mappings for dirty tracking */
786         }
787
788         if (!npages) {
789                 struct kvm_memory_slot *slot;
790
791                 r = -ENOMEM;
792                 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
793                                 GFP_KERNEL);
794                 if (!slots)
795                         goto out_free;
796                 slot = id_to_memslot(slots, mem->slot);
797                 slot->flags |= KVM_MEMSLOT_INVALID;
798
799                 update_memslots(slots, NULL);
800
801                 old_memslots = kvm->memslots;
802                 rcu_assign_pointer(kvm->memslots, slots);
803                 synchronize_srcu_expedited(&kvm->srcu);
804                 /* From this point no new shadow pages pointing to a deleted
805                  * memslot will be created.
806                  *
807                  * validation of sp->gfn happens in:
808                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
809                  *      - kvm_is_visible_gfn (mmu_check_roots)
810                  */
811                 kvm_arch_flush_shadow(kvm);
812                 kfree(old_memslots);
813         }
814
815         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
816         if (r)
817                 goto out_free;
818
819         /* map/unmap the pages in iommu page table */
820         if (npages) {
821                 r = kvm_iommu_map_pages(kvm, &new);
822                 if (r)
823                         goto out_free;
824         } else
825                 kvm_iommu_unmap_pages(kvm, &old);
826
827         r = -ENOMEM;
828         slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
829                         GFP_KERNEL);
830         if (!slots)
831                 goto out_free;
832
833         /* actual memory is freed via old in kvm_free_physmem_slot below */
834         if (!npages) {
835                 new.rmap = NULL;
836                 new.dirty_bitmap = NULL;
837                 memset(&new.arch, 0, sizeof(new.arch));
838         }
839
840         update_memslots(slots, &new);
841         old_memslots = kvm->memslots;
842         rcu_assign_pointer(kvm->memslots, slots);
843         synchronize_srcu_expedited(&kvm->srcu);
844
845         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
846
847         /*
848          * If the new memory slot is created, we need to clear all
849          * mmio sptes.
850          */
851         if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
852                 kvm_arch_flush_shadow(kvm);
853
854         kvm_free_physmem_slot(&old, &new);
855         kfree(old_memslots);
856
857         return 0;
858
859 out_free:
860         kvm_free_physmem_slot(&new, &old);
861 out:
862         return r;
863
864 }
865 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
866
867 int kvm_set_memory_region(struct kvm *kvm,
868                           struct kvm_userspace_memory_region *mem,
869                           int user_alloc)
870 {
871         int r;
872
873         mutex_lock(&kvm->slots_lock);
874         r = __kvm_set_memory_region(kvm, mem, user_alloc);
875         mutex_unlock(&kvm->slots_lock);
876         return r;
877 }
878 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
879
880 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
881                                    struct
882                                    kvm_userspace_memory_region *mem,
883                                    int user_alloc)
884 {
885         if (mem->slot >= KVM_MEMORY_SLOTS)
886                 return -EINVAL;
887         return kvm_set_memory_region(kvm, mem, user_alloc);
888 }
889
890 int kvm_get_dirty_log(struct kvm *kvm,
891                         struct kvm_dirty_log *log, int *is_dirty)
892 {
893         struct kvm_memory_slot *memslot;
894         int r, i;
895         unsigned long n;
896         unsigned long any = 0;
897
898         r = -EINVAL;
899         if (log->slot >= KVM_MEMORY_SLOTS)
900                 goto out;
901
902         memslot = id_to_memslot(kvm->memslots, log->slot);
903         r = -ENOENT;
904         if (!memslot->dirty_bitmap)
905                 goto out;
906
907         n = kvm_dirty_bitmap_bytes(memslot);
908
909         for (i = 0; !any && i < n/sizeof(long); ++i)
910                 any = memslot->dirty_bitmap[i];
911
912         r = -EFAULT;
913         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
914                 goto out;
915
916         if (any)
917                 *is_dirty = 1;
918
919         r = 0;
920 out:
921         return r;
922 }
923
924 bool kvm_largepages_enabled(void)
925 {
926         return largepages_enabled;
927 }
928
929 void kvm_disable_largepages(void)
930 {
931         largepages_enabled = false;
932 }
933 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
934
935 int is_error_page(struct page *page)
936 {
937         return page == bad_page || page == hwpoison_page || page == fault_page;
938 }
939 EXPORT_SYMBOL_GPL(is_error_page);
940
941 int is_error_pfn(pfn_t pfn)
942 {
943         return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
944 }
945 EXPORT_SYMBOL_GPL(is_error_pfn);
946
947 int is_hwpoison_pfn(pfn_t pfn)
948 {
949         return pfn == hwpoison_pfn;
950 }
951 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
952
953 int is_fault_pfn(pfn_t pfn)
954 {
955         return pfn == fault_pfn;
956 }
957 EXPORT_SYMBOL_GPL(is_fault_pfn);
958
959 int is_noslot_pfn(pfn_t pfn)
960 {
961         return pfn == bad_pfn;
962 }
963 EXPORT_SYMBOL_GPL(is_noslot_pfn);
964
965 int is_invalid_pfn(pfn_t pfn)
966 {
967         return pfn == hwpoison_pfn || pfn == fault_pfn;
968 }
969 EXPORT_SYMBOL_GPL(is_invalid_pfn);
970
971 static inline unsigned long bad_hva(void)
972 {
973         return PAGE_OFFSET;
974 }
975
976 int kvm_is_error_hva(unsigned long addr)
977 {
978         return addr == bad_hva();
979 }
980 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
981
982 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
983 {
984         return __gfn_to_memslot(kvm_memslots(kvm), gfn);
985 }
986 EXPORT_SYMBOL_GPL(gfn_to_memslot);
987
988 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
989 {
990         struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
991
992         if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
993               memslot->flags & KVM_MEMSLOT_INVALID)
994                 return 0;
995
996         return 1;
997 }
998 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
999
1000 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1001 {
1002         struct vm_area_struct *vma;
1003         unsigned long addr, size;
1004
1005         size = PAGE_SIZE;
1006
1007         addr = gfn_to_hva(kvm, gfn);
1008         if (kvm_is_error_hva(addr))
1009                 return PAGE_SIZE;
1010
1011         down_read(&current->mm->mmap_sem);
1012         vma = find_vma(current->mm, addr);
1013         if (!vma)
1014                 goto out;
1015
1016         size = vma_kernel_pagesize(vma);
1017
1018 out:
1019         up_read(&current->mm->mmap_sem);
1020
1021         return size;
1022 }
1023
1024 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1025                                      gfn_t *nr_pages)
1026 {
1027         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1028                 return bad_hva();
1029
1030         if (nr_pages)
1031                 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1032
1033         return gfn_to_hva_memslot(slot, gfn);
1034 }
1035
1036 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1037 {
1038         return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1039 }
1040 EXPORT_SYMBOL_GPL(gfn_to_hva);
1041
1042 static pfn_t get_fault_pfn(void)
1043 {
1044         get_page(fault_page);
1045         return fault_pfn;
1046 }
1047
1048 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1049         unsigned long start, int write, struct page **page)
1050 {
1051         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1052
1053         if (write)
1054                 flags |= FOLL_WRITE;
1055
1056         return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1057 }
1058
1059 static inline int check_user_page_hwpoison(unsigned long addr)
1060 {
1061         int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1062
1063         rc = __get_user_pages(current, current->mm, addr, 1,
1064                               flags, NULL, NULL, NULL);
1065         return rc == -EHWPOISON;
1066 }
1067
1068 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1069                         bool *async, bool write_fault, bool *writable)
1070 {
1071         struct page *page[1];
1072         int npages = 0;
1073         pfn_t pfn;
1074
1075         /* we can do it either atomically or asynchronously, not both */
1076         BUG_ON(atomic && async);
1077
1078         BUG_ON(!write_fault && !writable);
1079
1080         if (writable)
1081                 *writable = true;
1082
1083         if (atomic || async)
1084                 npages = __get_user_pages_fast(addr, 1, 1, page);
1085
1086         if (unlikely(npages != 1) && !atomic) {
1087                 might_sleep();
1088
1089                 if (writable)
1090                         *writable = write_fault;
1091
1092                 if (async) {
1093                         down_read(&current->mm->mmap_sem);
1094                         npages = get_user_page_nowait(current, current->mm,
1095                                                      addr, write_fault, page);
1096                         up_read(&current->mm->mmap_sem);
1097                 } else
1098                         npages = get_user_pages_fast(addr, 1, write_fault,
1099                                                      page);
1100
1101                 /* map read fault as writable if possible */
1102                 if (unlikely(!write_fault) && npages == 1) {
1103                         struct page *wpage[1];
1104
1105                         npages = __get_user_pages_fast(addr, 1, 1, wpage);
1106                         if (npages == 1) {
1107                                 *writable = true;
1108                                 put_page(page[0]);
1109                                 page[0] = wpage[0];
1110                         }
1111                         npages = 1;
1112                 }
1113         }
1114
1115         if (unlikely(npages != 1)) {
1116                 struct vm_area_struct *vma;
1117
1118                 if (atomic)
1119                         return get_fault_pfn();
1120
1121                 down_read(&current->mm->mmap_sem);
1122                 if (npages == -EHWPOISON ||
1123                         (!async && check_user_page_hwpoison(addr))) {
1124                         up_read(&current->mm->mmap_sem);
1125                         get_page(hwpoison_page);
1126                         return page_to_pfn(hwpoison_page);
1127                 }
1128
1129                 vma = find_vma_intersection(current->mm, addr, addr+1);
1130
1131                 if (vma == NULL)
1132                         pfn = get_fault_pfn();
1133                 else if ((vma->vm_flags & VM_PFNMAP)) {
1134                         pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1135                                 vma->vm_pgoff;
1136                         BUG_ON(!kvm_is_mmio_pfn(pfn));
1137                 } else {
1138                         if (async && (vma->vm_flags & VM_WRITE))
1139                                 *async = true;
1140                         pfn = get_fault_pfn();
1141                 }
1142                 up_read(&current->mm->mmap_sem);
1143         } else
1144                 pfn = page_to_pfn(page[0]);
1145
1146         return pfn;
1147 }
1148
1149 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1150 {
1151         return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1152 }
1153 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1154
1155 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1156                           bool write_fault, bool *writable)
1157 {
1158         unsigned long addr;
1159
1160         if (async)
1161                 *async = false;
1162
1163         addr = gfn_to_hva(kvm, gfn);
1164         if (kvm_is_error_hva(addr)) {
1165                 get_page(bad_page);
1166                 return page_to_pfn(bad_page);
1167         }
1168
1169         return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1170 }
1171
1172 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1173 {
1174         return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1175 }
1176 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1177
1178 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1179                        bool write_fault, bool *writable)
1180 {
1181         return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1182 }
1183 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1184
1185 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1186 {
1187         return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1188 }
1189 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1190
1191 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1192                       bool *writable)
1193 {
1194         return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1195 }
1196 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1197
1198 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1199                          struct kvm_memory_slot *slot, gfn_t gfn)
1200 {
1201         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1202         return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1203 }
1204
1205 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1206                                                                   int nr_pages)
1207 {
1208         unsigned long addr;
1209         gfn_t entry;
1210
1211         addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1212         if (kvm_is_error_hva(addr))
1213                 return -1;
1214
1215         if (entry < nr_pages)
1216                 return 0;
1217
1218         return __get_user_pages_fast(addr, nr_pages, 1, pages);
1219 }
1220 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1221
1222 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1223 {
1224         pfn_t pfn;
1225
1226         pfn = gfn_to_pfn(kvm, gfn);
1227         if (!kvm_is_mmio_pfn(pfn))
1228                 return pfn_to_page(pfn);
1229
1230         WARN_ON(kvm_is_mmio_pfn(pfn));
1231
1232         get_page(bad_page);
1233         return bad_page;
1234 }
1235
1236 EXPORT_SYMBOL_GPL(gfn_to_page);
1237
1238 void kvm_release_page_clean(struct page *page)
1239 {
1240         kvm_release_pfn_clean(page_to_pfn(page));
1241 }
1242 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1243
1244 void kvm_release_pfn_clean(pfn_t pfn)
1245 {
1246         if (!kvm_is_mmio_pfn(pfn))
1247                 put_page(pfn_to_page(pfn));
1248 }
1249 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1250
1251 void kvm_release_page_dirty(struct page *page)
1252 {
1253         kvm_release_pfn_dirty(page_to_pfn(page));
1254 }
1255 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1256
1257 void kvm_release_pfn_dirty(pfn_t pfn)
1258 {
1259         kvm_set_pfn_dirty(pfn);
1260         kvm_release_pfn_clean(pfn);
1261 }
1262 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1263
1264 void kvm_set_page_dirty(struct page *page)
1265 {
1266         kvm_set_pfn_dirty(page_to_pfn(page));
1267 }
1268 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1269
1270 void kvm_set_pfn_dirty(pfn_t pfn)
1271 {
1272         if (!kvm_is_mmio_pfn(pfn)) {
1273                 struct page *page = pfn_to_page(pfn);
1274                 if (!PageReserved(page))
1275                         SetPageDirty(page);
1276         }
1277 }
1278 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1279
1280 void kvm_set_pfn_accessed(pfn_t pfn)
1281 {
1282         if (!kvm_is_mmio_pfn(pfn))
1283                 mark_page_accessed(pfn_to_page(pfn));
1284 }
1285 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1286
1287 void kvm_get_pfn(pfn_t pfn)
1288 {
1289         if (!kvm_is_mmio_pfn(pfn))
1290                 get_page(pfn_to_page(pfn));
1291 }
1292 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1293
1294 static int next_segment(unsigned long len, int offset)
1295 {
1296         if (len > PAGE_SIZE - offset)
1297                 return PAGE_SIZE - offset;
1298         else
1299                 return len;
1300 }
1301
1302 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1303                         int len)
1304 {
1305         int r;
1306         unsigned long addr;
1307
1308         addr = gfn_to_hva(kvm, gfn);
1309         if (kvm_is_error_hva(addr))
1310                 return -EFAULT;
1311         r = __copy_from_user(data, (void __user *)addr + offset, len);
1312         if (r)
1313                 return -EFAULT;
1314         return 0;
1315 }
1316 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1317
1318 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1319 {
1320         gfn_t gfn = gpa >> PAGE_SHIFT;
1321         int seg;
1322         int offset = offset_in_page(gpa);
1323         int ret;
1324
1325         while ((seg = next_segment(len, offset)) != 0) {
1326                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1327                 if (ret < 0)
1328                         return ret;
1329                 offset = 0;
1330                 len -= seg;
1331                 data += seg;
1332                 ++gfn;
1333         }
1334         return 0;
1335 }
1336 EXPORT_SYMBOL_GPL(kvm_read_guest);
1337
1338 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1339                           unsigned long len)
1340 {
1341         int r;
1342         unsigned long addr;
1343         gfn_t gfn = gpa >> PAGE_SHIFT;
1344         int offset = offset_in_page(gpa);
1345
1346         addr = gfn_to_hva(kvm, gfn);
1347         if (kvm_is_error_hva(addr))
1348                 return -EFAULT;
1349         pagefault_disable();
1350         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1351         pagefault_enable();
1352         if (r)
1353                 return -EFAULT;
1354         return 0;
1355 }
1356 EXPORT_SYMBOL(kvm_read_guest_atomic);
1357
1358 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1359                          int offset, int len)
1360 {
1361         int r;
1362         unsigned long addr;
1363
1364         addr = gfn_to_hva(kvm, gfn);
1365         if (kvm_is_error_hva(addr))
1366                 return -EFAULT;
1367         r = __copy_to_user((void __user *)addr + offset, data, len);
1368         if (r)
1369                 return -EFAULT;
1370         mark_page_dirty(kvm, gfn);
1371         return 0;
1372 }
1373 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1374
1375 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1376                     unsigned long len)
1377 {
1378         gfn_t gfn = gpa >> PAGE_SHIFT;
1379         int seg;
1380         int offset = offset_in_page(gpa);
1381         int ret;
1382
1383         while ((seg = next_segment(len, offset)) != 0) {
1384                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1385                 if (ret < 0)
1386                         return ret;
1387                 offset = 0;
1388                 len -= seg;
1389                 data += seg;
1390                 ++gfn;
1391         }
1392         return 0;
1393 }
1394
1395 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1396                               gpa_t gpa)
1397 {
1398         struct kvm_memslots *slots = kvm_memslots(kvm);
1399         int offset = offset_in_page(gpa);
1400         gfn_t gfn = gpa >> PAGE_SHIFT;
1401
1402         ghc->gpa = gpa;
1403         ghc->generation = slots->generation;
1404         ghc->memslot = gfn_to_memslot(kvm, gfn);
1405         ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1406         if (!kvm_is_error_hva(ghc->hva))
1407                 ghc->hva += offset;
1408         else
1409                 return -EFAULT;
1410
1411         return 0;
1412 }
1413 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1414
1415 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1416                            void *data, unsigned long len)
1417 {
1418         struct kvm_memslots *slots = kvm_memslots(kvm);
1419         int r;
1420
1421         if (slots->generation != ghc->generation)
1422                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1423
1424         if (kvm_is_error_hva(ghc->hva))
1425                 return -EFAULT;
1426
1427         r = __copy_to_user((void __user *)ghc->hva, data, len);
1428         if (r)
1429                 return -EFAULT;
1430         mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1431
1432         return 0;
1433 }
1434 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1435
1436 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1437                            void *data, unsigned long len)
1438 {
1439         struct kvm_memslots *slots = kvm_memslots(kvm);
1440         int r;
1441
1442         if (slots->generation != ghc->generation)
1443                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1444
1445         if (kvm_is_error_hva(ghc->hva))
1446                 return -EFAULT;
1447
1448         r = __copy_from_user(data, (void __user *)ghc->hva, len);
1449         if (r)
1450                 return -EFAULT;
1451
1452         return 0;
1453 }
1454 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1455
1456 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1457 {
1458         return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1459                                     offset, len);
1460 }
1461 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1462
1463 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1464 {
1465         gfn_t gfn = gpa >> PAGE_SHIFT;
1466         int seg;
1467         int offset = offset_in_page(gpa);
1468         int ret;
1469
1470         while ((seg = next_segment(len, offset)) != 0) {
1471                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1472                 if (ret < 0)
1473                         return ret;
1474                 offset = 0;
1475                 len -= seg;
1476                 ++gfn;
1477         }
1478         return 0;
1479 }
1480 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1481
1482 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1483                              gfn_t gfn)
1484 {
1485         if (memslot && memslot->dirty_bitmap) {
1486                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1487
1488                 /* TODO: introduce set_bit_le() and use it */
1489                 test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap);
1490         }
1491 }
1492
1493 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1494 {
1495         struct kvm_memory_slot *memslot;
1496
1497         memslot = gfn_to_memslot(kvm, gfn);
1498         mark_page_dirty_in_slot(kvm, memslot, gfn);
1499 }
1500
1501 /*
1502  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1503  */
1504 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1505 {
1506         DEFINE_WAIT(wait);
1507
1508         for (;;) {
1509                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1510
1511                 if (kvm_arch_vcpu_runnable(vcpu)) {
1512                         kvm_make_request(KVM_REQ_UNHALT, vcpu);
1513                         break;
1514                 }
1515                 if (kvm_cpu_has_pending_timer(vcpu))
1516                         break;
1517                 if (signal_pending(current))
1518                         break;
1519
1520                 schedule();
1521         }
1522
1523         finish_wait(&vcpu->wq, &wait);
1524 }
1525
1526 #ifndef CONFIG_S390
1527 /*
1528  * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1529  */
1530 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1531 {
1532         int me;
1533         int cpu = vcpu->cpu;
1534         wait_queue_head_t *wqp;
1535
1536         wqp = kvm_arch_vcpu_wq(vcpu);
1537         if (waitqueue_active(wqp)) {
1538                 wake_up_interruptible(wqp);
1539                 ++vcpu->stat.halt_wakeup;
1540         }
1541
1542         me = get_cpu();
1543         if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1544                 if (kvm_arch_vcpu_should_kick(vcpu))
1545                         smp_send_reschedule(cpu);
1546         put_cpu();
1547 }
1548 #endif /* !CONFIG_S390 */
1549
1550 void kvm_resched(struct kvm_vcpu *vcpu)
1551 {
1552         if (!need_resched())
1553                 return;
1554         cond_resched();
1555 }
1556 EXPORT_SYMBOL_GPL(kvm_resched);
1557
1558 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1559 {
1560         struct pid *pid;
1561         struct task_struct *task = NULL;
1562
1563         rcu_read_lock();
1564         pid = rcu_dereference(target->pid);
1565         if (pid)
1566                 task = get_pid_task(target->pid, PIDTYPE_PID);
1567         rcu_read_unlock();
1568         if (!task)
1569                 return false;
1570         if (task->flags & PF_VCPU) {
1571                 put_task_struct(task);
1572                 return false;
1573         }
1574         if (yield_to(task, 1)) {
1575                 put_task_struct(task);
1576                 return true;
1577         }
1578         put_task_struct(task);
1579         return false;
1580 }
1581 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1582
1583 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1584 {
1585         struct kvm *kvm = me->kvm;
1586         struct kvm_vcpu *vcpu;
1587         int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1588         int yielded = 0;
1589         int pass;
1590         int i;
1591
1592         /*
1593          * We boost the priority of a VCPU that is runnable but not
1594          * currently running, because it got preempted by something
1595          * else and called schedule in __vcpu_run.  Hopefully that
1596          * VCPU is holding the lock that we need and will release it.
1597          * We approximate round-robin by starting at the last boosted VCPU.
1598          */
1599         for (pass = 0; pass < 2 && !yielded; pass++) {
1600                 kvm_for_each_vcpu(i, vcpu, kvm) {
1601                         if (!pass && i <= last_boosted_vcpu) {
1602                                 i = last_boosted_vcpu;
1603                                 continue;
1604                         } else if (pass && i > last_boosted_vcpu)
1605                                 break;
1606                         if (vcpu == me)
1607                                 continue;
1608                         if (waitqueue_active(&vcpu->wq))
1609                                 continue;
1610                         if (kvm_vcpu_yield_to(vcpu)) {
1611                                 kvm->last_boosted_vcpu = i;
1612                                 yielded = 1;
1613                                 break;
1614                         }
1615                 }
1616         }
1617 }
1618 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1619
1620 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1621 {
1622         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1623         struct page *page;
1624
1625         if (vmf->pgoff == 0)
1626                 page = virt_to_page(vcpu->run);
1627 #ifdef CONFIG_X86
1628         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1629                 page = virt_to_page(vcpu->arch.pio_data);
1630 #endif
1631 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1632         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1633                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1634 #endif
1635         else
1636                 return kvm_arch_vcpu_fault(vcpu, vmf);
1637         get_page(page);
1638         vmf->page = page;
1639         return 0;
1640 }
1641
1642 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1643         .fault = kvm_vcpu_fault,
1644 };
1645
1646 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1647 {
1648         vma->vm_ops = &kvm_vcpu_vm_ops;
1649         return 0;
1650 }
1651
1652 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1653 {
1654         struct kvm_vcpu *vcpu = filp->private_data;
1655
1656         kvm_put_kvm(vcpu->kvm);
1657         return 0;
1658 }
1659
1660 static struct file_operations kvm_vcpu_fops = {
1661         .release        = kvm_vcpu_release,
1662         .unlocked_ioctl = kvm_vcpu_ioctl,
1663 #ifdef CONFIG_COMPAT
1664         .compat_ioctl   = kvm_vcpu_compat_ioctl,
1665 #endif
1666         .mmap           = kvm_vcpu_mmap,
1667         .llseek         = noop_llseek,
1668 };
1669
1670 /*
1671  * Allocates an inode for the vcpu.
1672  */
1673 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1674 {
1675         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1676 }
1677
1678 /*
1679  * Creates some virtual cpus.  Good luck creating more than one.
1680  */
1681 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1682 {
1683         int r;
1684         struct kvm_vcpu *vcpu, *v;
1685
1686         vcpu = kvm_arch_vcpu_create(kvm, id);
1687         if (IS_ERR(vcpu))
1688                 return PTR_ERR(vcpu);
1689
1690         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1691
1692         r = kvm_arch_vcpu_setup(vcpu);
1693         if (r)
1694                 goto vcpu_destroy;
1695
1696         mutex_lock(&kvm->lock);
1697         if (!kvm_vcpu_compatible(vcpu)) {
1698                 r = -EINVAL;
1699                 goto unlock_vcpu_destroy;
1700         }
1701         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1702                 r = -EINVAL;
1703                 goto unlock_vcpu_destroy;
1704         }
1705
1706         kvm_for_each_vcpu(r, v, kvm)
1707                 if (v->vcpu_id == id) {
1708                         r = -EEXIST;
1709                         goto unlock_vcpu_destroy;
1710                 }
1711
1712         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1713
1714         /* Now it's all set up, let userspace reach it */
1715         kvm_get_kvm(kvm);
1716         r = create_vcpu_fd(vcpu);
1717         if (r < 0) {
1718                 kvm_put_kvm(kvm);
1719                 goto unlock_vcpu_destroy;
1720         }
1721
1722         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1723         smp_wmb();
1724         atomic_inc(&kvm->online_vcpus);
1725
1726         mutex_unlock(&kvm->lock);
1727         return r;
1728
1729 unlock_vcpu_destroy:
1730         mutex_unlock(&kvm->lock);
1731 vcpu_destroy:
1732         kvm_arch_vcpu_destroy(vcpu);
1733         return r;
1734 }
1735
1736 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1737 {
1738         if (sigset) {
1739                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1740                 vcpu->sigset_active = 1;
1741                 vcpu->sigset = *sigset;
1742         } else
1743                 vcpu->sigset_active = 0;
1744         return 0;
1745 }
1746
1747 static long kvm_vcpu_ioctl(struct file *filp,
1748                            unsigned int ioctl, unsigned long arg)
1749 {
1750         struct kvm_vcpu *vcpu = filp->private_data;
1751         void __user *argp = (void __user *)arg;
1752         int r;
1753         struct kvm_fpu *fpu = NULL;
1754         struct kvm_sregs *kvm_sregs = NULL;
1755
1756         if (vcpu->kvm->mm != current->mm)
1757                 return -EIO;
1758
1759 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1760         /*
1761          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1762          * so vcpu_load() would break it.
1763          */
1764         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1765                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1766 #endif
1767
1768
1769         vcpu_load(vcpu);
1770         switch (ioctl) {
1771         case KVM_RUN:
1772                 r = -EINVAL;
1773                 if (arg)
1774                         goto out;
1775                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1776                 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1777                 break;
1778         case KVM_GET_REGS: {
1779                 struct kvm_regs *kvm_regs;
1780
1781                 r = -ENOMEM;
1782                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1783                 if (!kvm_regs)
1784                         goto out;
1785                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1786                 if (r)
1787                         goto out_free1;
1788                 r = -EFAULT;
1789                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1790                         goto out_free1;
1791                 r = 0;
1792 out_free1:
1793                 kfree(kvm_regs);
1794                 break;
1795         }
1796         case KVM_SET_REGS: {
1797                 struct kvm_regs *kvm_regs;
1798
1799                 r = -ENOMEM;
1800                 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1801                 if (IS_ERR(kvm_regs)) {
1802                         r = PTR_ERR(kvm_regs);
1803                         goto out;
1804                 }
1805                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1806                 if (r)
1807                         goto out_free2;
1808                 r = 0;
1809 out_free2:
1810                 kfree(kvm_regs);
1811                 break;
1812         }
1813         case KVM_GET_SREGS: {
1814                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1815                 r = -ENOMEM;
1816                 if (!kvm_sregs)
1817                         goto out;
1818                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1819                 if (r)
1820                         goto out;
1821                 r = -EFAULT;
1822                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1823                         goto out;
1824                 r = 0;
1825                 break;
1826         }
1827         case KVM_SET_SREGS: {
1828                 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
1829                 if (IS_ERR(kvm_sregs)) {
1830                         r = PTR_ERR(kvm_sregs);
1831                         goto out;
1832                 }
1833                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1834                 if (r)
1835                         goto out;
1836                 r = 0;
1837                 break;
1838         }
1839         case KVM_GET_MP_STATE: {
1840                 struct kvm_mp_state mp_state;
1841
1842                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1843                 if (r)
1844                         goto out;
1845                 r = -EFAULT;
1846                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1847                         goto out;
1848                 r = 0;
1849                 break;
1850         }
1851         case KVM_SET_MP_STATE: {
1852                 struct kvm_mp_state mp_state;
1853
1854                 r = -EFAULT;
1855                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1856                         goto out;
1857                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1858                 if (r)
1859                         goto out;
1860                 r = 0;
1861                 break;
1862         }
1863         case KVM_TRANSLATE: {
1864                 struct kvm_translation tr;
1865
1866                 r = -EFAULT;
1867                 if (copy_from_user(&tr, argp, sizeof tr))
1868                         goto out;
1869                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1870                 if (r)
1871                         goto out;
1872                 r = -EFAULT;
1873                 if (copy_to_user(argp, &tr, sizeof tr))
1874                         goto out;
1875                 r = 0;
1876                 break;
1877         }
1878         case KVM_SET_GUEST_DEBUG: {
1879                 struct kvm_guest_debug dbg;
1880
1881                 r = -EFAULT;
1882                 if (copy_from_user(&dbg, argp, sizeof dbg))
1883                         goto out;
1884                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1885                 if (r)
1886                         goto out;
1887                 r = 0;
1888                 break;
1889         }
1890         case KVM_SET_SIGNAL_MASK: {
1891                 struct kvm_signal_mask __user *sigmask_arg = argp;
1892                 struct kvm_signal_mask kvm_sigmask;
1893                 sigset_t sigset, *p;
1894
1895                 p = NULL;
1896                 if (argp) {
1897                         r = -EFAULT;
1898                         if (copy_from_user(&kvm_sigmask, argp,
1899                                            sizeof kvm_sigmask))
1900                                 goto out;
1901                         r = -EINVAL;
1902                         if (kvm_sigmask.len != sizeof sigset)
1903                                 goto out;
1904                         r = -EFAULT;
1905                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1906                                            sizeof sigset))
1907                                 goto out;
1908                         p = &sigset;
1909                 }
1910                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1911                 break;
1912         }
1913         case KVM_GET_FPU: {
1914                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1915                 r = -ENOMEM;
1916                 if (!fpu)
1917                         goto out;
1918                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1919                 if (r)
1920                         goto out;
1921                 r = -EFAULT;
1922                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1923                         goto out;
1924                 r = 0;
1925                 break;
1926         }
1927         case KVM_SET_FPU: {
1928                 fpu = memdup_user(argp, sizeof(*fpu));
1929                 if (IS_ERR(fpu)) {
1930                         r = PTR_ERR(fpu);
1931                         goto out;
1932                 }
1933                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1934                 if (r)
1935                         goto out;
1936                 r = 0;
1937                 break;
1938         }
1939         default:
1940                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1941         }
1942 out:
1943         vcpu_put(vcpu);
1944         kfree(fpu);
1945         kfree(kvm_sregs);
1946         return r;
1947 }
1948
1949 #ifdef CONFIG_COMPAT
1950 static long kvm_vcpu_compat_ioctl(struct file *filp,
1951                                   unsigned int ioctl, unsigned long arg)
1952 {
1953         struct kvm_vcpu *vcpu = filp->private_data;
1954         void __user *argp = compat_ptr(arg);
1955         int r;
1956
1957         if (vcpu->kvm->mm != current->mm)
1958                 return -EIO;
1959
1960         switch (ioctl) {
1961         case KVM_SET_SIGNAL_MASK: {
1962                 struct kvm_signal_mask __user *sigmask_arg = argp;
1963                 struct kvm_signal_mask kvm_sigmask;
1964                 compat_sigset_t csigset;
1965                 sigset_t sigset;
1966
1967                 if (argp) {
1968                         r = -EFAULT;
1969                         if (copy_from_user(&kvm_sigmask, argp,
1970                                            sizeof kvm_sigmask))
1971                                 goto out;
1972                         r = -EINVAL;
1973                         if (kvm_sigmask.len != sizeof csigset)
1974                                 goto out;
1975                         r = -EFAULT;
1976                         if (copy_from_user(&csigset, sigmask_arg->sigset,
1977                                            sizeof csigset))
1978                                 goto out;
1979                         sigset_from_compat(&sigset, &csigset);
1980                         r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1981                 } else
1982                         r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
1983                 break;
1984         }
1985         default:
1986                 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1987         }
1988
1989 out:
1990         return r;
1991 }
1992 #endif
1993
1994 static long kvm_vm_ioctl(struct file *filp,
1995                            unsigned int ioctl, unsigned long arg)
1996 {
1997         struct kvm *kvm = filp->private_data;
1998         void __user *argp = (void __user *)arg;
1999         int r;
2000
2001         if (kvm->mm != current->mm)
2002                 return -EIO;
2003         switch (ioctl) {
2004         case KVM_CREATE_VCPU:
2005                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2006                 if (r < 0)
2007                         goto out;
2008                 break;
2009         case KVM_SET_USER_MEMORY_REGION: {
2010                 struct kvm_userspace_memory_region kvm_userspace_mem;
2011
2012                 r = -EFAULT;
2013                 if (copy_from_user(&kvm_userspace_mem, argp,
2014                                                 sizeof kvm_userspace_mem))
2015                         goto out;
2016
2017                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2018                 if (r)
2019                         goto out;
2020                 break;
2021         }
2022         case KVM_GET_DIRTY_LOG: {
2023                 struct kvm_dirty_log log;
2024
2025                 r = -EFAULT;
2026                 if (copy_from_user(&log, argp, sizeof log))
2027                         goto out;
2028                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2029                 if (r)
2030                         goto out;
2031                 break;
2032         }
2033 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2034         case KVM_REGISTER_COALESCED_MMIO: {
2035                 struct kvm_coalesced_mmio_zone zone;
2036                 r = -EFAULT;
2037                 if (copy_from_user(&zone, argp, sizeof zone))
2038                         goto out;
2039                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2040                 if (r)
2041                         goto out;
2042                 r = 0;
2043                 break;
2044         }
2045         case KVM_UNREGISTER_COALESCED_MMIO: {
2046                 struct kvm_coalesced_mmio_zone zone;
2047                 r = -EFAULT;
2048                 if (copy_from_user(&zone, argp, sizeof zone))
2049                         goto out;
2050                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2051                 if (r)
2052                         goto out;
2053                 r = 0;
2054                 break;
2055         }
2056 #endif
2057         case KVM_IRQFD: {
2058                 struct kvm_irqfd data;
2059
2060                 r = -EFAULT;
2061                 if (copy_from_user(&data, argp, sizeof data))
2062                         goto out;
2063                 r = kvm_irqfd(kvm, &data);
2064                 break;
2065         }
2066         case KVM_IOEVENTFD: {
2067                 struct kvm_ioeventfd data;
2068
2069                 r = -EFAULT;
2070                 if (copy_from_user(&data, argp, sizeof data))
2071                         goto out;
2072                 r = kvm_ioeventfd(kvm, &data);
2073                 break;
2074         }
2075 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2076         case KVM_SET_BOOT_CPU_ID:
2077                 r = 0;
2078                 mutex_lock(&kvm->lock);
2079                 if (atomic_read(&kvm->online_vcpus) != 0)
2080                         r = -EBUSY;
2081                 else
2082                         kvm->bsp_vcpu_id = arg;
2083                 mutex_unlock(&kvm->lock);
2084                 break;
2085 #endif
2086 #ifdef CONFIG_HAVE_KVM_MSI
2087         case KVM_SIGNAL_MSI: {
2088                 struct kvm_msi msi;
2089
2090                 r = -EFAULT;
2091                 if (copy_from_user(&msi, argp, sizeof msi))
2092                         goto out;
2093                 r = kvm_send_userspace_msi(kvm, &msi);
2094                 break;
2095         }
2096 #endif
2097         default:
2098                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2099                 if (r == -ENOTTY)
2100                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2101         }
2102 out:
2103         return r;
2104 }
2105
2106 #ifdef CONFIG_COMPAT
2107 struct compat_kvm_dirty_log {
2108         __u32 slot;
2109         __u32 padding1;
2110         union {
2111                 compat_uptr_t dirty_bitmap; /* one bit per page */
2112                 __u64 padding2;
2113         };
2114 };
2115
2116 static long kvm_vm_compat_ioctl(struct file *filp,
2117                            unsigned int ioctl, unsigned long arg)
2118 {
2119         struct kvm *kvm = filp->private_data;
2120         int r;
2121
2122         if (kvm->mm != current->mm)
2123                 return -EIO;
2124         switch (ioctl) {
2125         case KVM_GET_DIRTY_LOG: {
2126                 struct compat_kvm_dirty_log compat_log;
2127                 struct kvm_dirty_log log;
2128
2129                 r = -EFAULT;
2130                 if (copy_from_user(&compat_log, (void __user *)arg,
2131                                    sizeof(compat_log)))
2132                         goto out;
2133                 log.slot         = compat_log.slot;
2134                 log.padding1     = compat_log.padding1;
2135                 log.padding2     = compat_log.padding2;
2136                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2137
2138                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2139                 if (r)
2140                         goto out;
2141                 break;
2142         }
2143         default:
2144                 r = kvm_vm_ioctl(filp, ioctl, arg);
2145         }
2146
2147 out:
2148         return r;
2149 }
2150 #endif
2151
2152 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2153 {
2154         struct page *page[1];
2155         unsigned long addr;
2156         int npages;
2157         gfn_t gfn = vmf->pgoff;
2158         struct kvm *kvm = vma->vm_file->private_data;
2159
2160         addr = gfn_to_hva(kvm, gfn);
2161         if (kvm_is_error_hva(addr))
2162                 return VM_FAULT_SIGBUS;
2163
2164         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2165                                 NULL);
2166         if (unlikely(npages != 1))
2167                 return VM_FAULT_SIGBUS;
2168
2169         vmf->page = page[0];
2170         return 0;
2171 }
2172
2173 static const struct vm_operations_struct kvm_vm_vm_ops = {
2174         .fault = kvm_vm_fault,
2175 };
2176
2177 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2178 {
2179         vma->vm_ops = &kvm_vm_vm_ops;
2180         return 0;
2181 }
2182
2183 static struct file_operations kvm_vm_fops = {
2184         .release        = kvm_vm_release,
2185         .unlocked_ioctl = kvm_vm_ioctl,
2186 #ifdef CONFIG_COMPAT
2187         .compat_ioctl   = kvm_vm_compat_ioctl,
2188 #endif
2189         .mmap           = kvm_vm_mmap,
2190         .llseek         = noop_llseek,
2191 };
2192
2193 static int kvm_dev_ioctl_create_vm(unsigned long type)
2194 {
2195         int r;
2196         struct kvm *kvm;
2197
2198         kvm = kvm_create_vm(type);
2199         if (IS_ERR(kvm))
2200                 return PTR_ERR(kvm);
2201 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2202         r = kvm_coalesced_mmio_init(kvm);
2203         if (r < 0) {
2204                 kvm_put_kvm(kvm);
2205                 return r;
2206         }
2207 #endif
2208         r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2209         if (r < 0)
2210                 kvm_put_kvm(kvm);
2211
2212         return r;
2213 }
2214
2215 static long kvm_dev_ioctl_check_extension_generic(long arg)
2216 {
2217         switch (arg) {
2218         case KVM_CAP_USER_MEMORY:
2219         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2220         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2221 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2222         case KVM_CAP_SET_BOOT_CPU_ID:
2223 #endif
2224         case KVM_CAP_INTERNAL_ERROR_DATA:
2225 #ifdef CONFIG_HAVE_KVM_MSI
2226         case KVM_CAP_SIGNAL_MSI:
2227 #endif
2228                 return 1;
2229 #ifdef KVM_CAP_IRQ_ROUTING
2230         case KVM_CAP_IRQ_ROUTING:
2231                 return KVM_MAX_IRQ_ROUTES;
2232 #endif
2233         default:
2234                 break;
2235         }
2236         return kvm_dev_ioctl_check_extension(arg);
2237 }
2238
2239 static long kvm_dev_ioctl(struct file *filp,
2240                           unsigned int ioctl, unsigned long arg)
2241 {
2242         long r = -EINVAL;
2243
2244         switch (ioctl) {
2245         case KVM_GET_API_VERSION:
2246                 r = -EINVAL;
2247                 if (arg)
2248                         goto out;
2249                 r = KVM_API_VERSION;
2250                 break;
2251         case KVM_CREATE_VM:
2252                 r = kvm_dev_ioctl_create_vm(arg);
2253                 break;
2254         case KVM_CHECK_EXTENSION:
2255                 r = kvm_dev_ioctl_check_extension_generic(arg);
2256                 break;
2257         case KVM_GET_VCPU_MMAP_SIZE:
2258                 r = -EINVAL;
2259                 if (arg)
2260                         goto out;
2261                 r = PAGE_SIZE;     /* struct kvm_run */
2262 #ifdef CONFIG_X86
2263                 r += PAGE_SIZE;    /* pio data page */
2264 #endif
2265 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2266                 r += PAGE_SIZE;    /* coalesced mmio ring page */
2267 #endif
2268                 break;
2269         case KVM_TRACE_ENABLE:
2270         case KVM_TRACE_PAUSE:
2271         case KVM_TRACE_DISABLE:
2272                 r = -EOPNOTSUPP;
2273                 break;
2274         default:
2275                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2276         }
2277 out:
2278         return r;
2279 }
2280
2281 static struct file_operations kvm_chardev_ops = {
2282         .unlocked_ioctl = kvm_dev_ioctl,
2283         .compat_ioctl   = kvm_dev_ioctl,
2284         .llseek         = noop_llseek,
2285 };
2286
2287 static struct miscdevice kvm_dev = {
2288         KVM_MINOR,
2289         "kvm",
2290         &kvm_chardev_ops,
2291 };
2292
2293 static void hardware_enable_nolock(void *junk)
2294 {
2295         int cpu = raw_smp_processor_id();
2296         int r;
2297
2298         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2299                 return;
2300
2301         cpumask_set_cpu(cpu, cpus_hardware_enabled);
2302
2303         r = kvm_arch_hardware_enable(NULL);
2304
2305         if (r) {
2306                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2307                 atomic_inc(&hardware_enable_failed);
2308                 printk(KERN_INFO "kvm: enabling virtualization on "
2309                                  "CPU%d failed\n", cpu);
2310         }
2311 }
2312
2313 static void hardware_enable(void *junk)
2314 {
2315         raw_spin_lock(&kvm_lock);
2316         hardware_enable_nolock(junk);
2317         raw_spin_unlock(&kvm_lock);
2318 }
2319
2320 static void hardware_disable_nolock(void *junk)
2321 {
2322         int cpu = raw_smp_processor_id();
2323
2324         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2325                 return;
2326         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2327         kvm_arch_hardware_disable(NULL);
2328 }
2329
2330 static void hardware_disable(void *junk)
2331 {
2332         raw_spin_lock(&kvm_lock);
2333         hardware_disable_nolock(junk);
2334         raw_spin_unlock(&kvm_lock);
2335 }
2336
2337 static void hardware_disable_all_nolock(void)
2338 {
2339         BUG_ON(!kvm_usage_count);
2340
2341         kvm_usage_count--;
2342         if (!kvm_usage_count)
2343                 on_each_cpu(hardware_disable_nolock, NULL, 1);
2344 }
2345
2346 static void hardware_disable_all(void)
2347 {
2348         raw_spin_lock(&kvm_lock);
2349         hardware_disable_all_nolock();
2350         raw_spin_unlock(&kvm_lock);
2351 }
2352
2353 static int hardware_enable_all(void)
2354 {
2355         int r = 0;
2356
2357         raw_spin_lock(&kvm_lock);
2358
2359         kvm_usage_count++;
2360         if (kvm_usage_count == 1) {
2361                 atomic_set(&hardware_enable_failed, 0);
2362                 on_each_cpu(hardware_enable_nolock, NULL, 1);
2363
2364                 if (atomic_read(&hardware_enable_failed)) {
2365                         hardware_disable_all_nolock();
2366                         r = -EBUSY;
2367                 }
2368         }
2369
2370         raw_spin_unlock(&kvm_lock);
2371
2372         return r;
2373 }
2374
2375 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2376                            void *v)
2377 {
2378         int cpu = (long)v;
2379
2380         if (!kvm_usage_count)
2381                 return NOTIFY_OK;
2382
2383         val &= ~CPU_TASKS_FROZEN;
2384         switch (val) {
2385         case CPU_DYING:
2386                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2387                        cpu);
2388                 hardware_disable(NULL);
2389                 break;
2390         case CPU_STARTING:
2391                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2392                        cpu);
2393                 hardware_enable(NULL);
2394                 break;
2395         }
2396         return NOTIFY_OK;
2397 }
2398
2399
2400 asmlinkage void kvm_spurious_fault(void)
2401 {
2402         /* Fault while not rebooting.  We want the trace. */
2403         BUG();
2404 }
2405 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2406
2407 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2408                       void *v)
2409 {
2410         /*
2411          * Some (well, at least mine) BIOSes hang on reboot if
2412          * in vmx root mode.
2413          *
2414          * And Intel TXT required VMX off for all cpu when system shutdown.
2415          */
2416         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2417         kvm_rebooting = true;
2418         on_each_cpu(hardware_disable_nolock, NULL, 1);
2419         return NOTIFY_OK;
2420 }
2421
2422 static struct notifier_block kvm_reboot_notifier = {
2423         .notifier_call = kvm_reboot,
2424         .priority = 0,
2425 };
2426
2427 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2428 {
2429         int i;
2430
2431         for (i = 0; i < bus->dev_count; i++) {
2432                 struct kvm_io_device *pos = bus->range[i].dev;
2433
2434                 kvm_iodevice_destructor(pos);
2435         }
2436         kfree(bus);
2437 }
2438
2439 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2440 {
2441         const struct kvm_io_range *r1 = p1;
2442         const struct kvm_io_range *r2 = p2;
2443
2444         if (r1->addr < r2->addr)
2445                 return -1;
2446         if (r1->addr + r1->len > r2->addr + r2->len)
2447                 return 1;
2448         return 0;
2449 }
2450
2451 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2452                           gpa_t addr, int len)
2453 {
2454         bus->range[bus->dev_count++] = (struct kvm_io_range) {
2455                 .addr = addr,
2456                 .len = len,
2457                 .dev = dev,
2458         };
2459
2460         sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2461                 kvm_io_bus_sort_cmp, NULL);
2462
2463         return 0;
2464 }
2465
2466 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2467                              gpa_t addr, int len)
2468 {
2469         struct kvm_io_range *range, key;
2470         int off;
2471
2472         key = (struct kvm_io_range) {
2473                 .addr = addr,
2474                 .len = len,
2475         };
2476
2477         range = bsearch(&key, bus->range, bus->dev_count,
2478                         sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2479         if (range == NULL)
2480                 return -ENOENT;
2481
2482         off = range - bus->range;
2483
2484         while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2485                 off--;
2486
2487         return off;
2488 }
2489
2490 /* kvm_io_bus_write - called under kvm->slots_lock */
2491 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2492                      int len, const void *val)
2493 {
2494         int idx;
2495         struct kvm_io_bus *bus;
2496         struct kvm_io_range range;
2497
2498         range = (struct kvm_io_range) {
2499                 .addr = addr,
2500                 .len = len,
2501         };
2502
2503         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2504         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2505         if (idx < 0)
2506                 return -EOPNOTSUPP;
2507
2508         while (idx < bus->dev_count &&
2509                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2510                 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2511                         return 0;
2512                 idx++;
2513         }
2514
2515         return -EOPNOTSUPP;
2516 }
2517
2518 /* kvm_io_bus_read - called under kvm->slots_lock */
2519 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2520                     int len, void *val)
2521 {
2522         int idx;
2523         struct kvm_io_bus *bus;
2524         struct kvm_io_range range;
2525
2526         range = (struct kvm_io_range) {
2527                 .addr = addr,
2528                 .len = len,
2529         };
2530
2531         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2532         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2533         if (idx < 0)
2534                 return -EOPNOTSUPP;
2535
2536         while (idx < bus->dev_count &&
2537                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2538                 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2539                         return 0;
2540                 idx++;
2541         }
2542
2543         return -EOPNOTSUPP;
2544 }
2545
2546 /* Caller must hold slots_lock. */
2547 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2548                             int len, struct kvm_io_device *dev)
2549 {
2550         struct kvm_io_bus *new_bus, *bus;
2551
2552         bus = kvm->buses[bus_idx];
2553         if (bus->dev_count > NR_IOBUS_DEVS - 1)
2554                 return -ENOSPC;
2555
2556         new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2557                           sizeof(struct kvm_io_range)), GFP_KERNEL);
2558         if (!new_bus)
2559                 return -ENOMEM;
2560         memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2561                sizeof(struct kvm_io_range)));
2562         kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2563         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2564         synchronize_srcu_expedited(&kvm->srcu);
2565         kfree(bus);
2566
2567         return 0;
2568 }
2569
2570 /* Caller must hold slots_lock. */
2571 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2572                               struct kvm_io_device *dev)
2573 {
2574         int i, r;
2575         struct kvm_io_bus *new_bus, *bus;
2576
2577         bus = kvm->buses[bus_idx];
2578         r = -ENOENT;
2579         for (i = 0; i < bus->dev_count; i++)
2580                 if (bus->range[i].dev == dev) {
2581                         r = 0;
2582                         break;
2583                 }
2584
2585         if (r)
2586                 return r;
2587
2588         new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2589                           sizeof(struct kvm_io_range)), GFP_KERNEL);
2590         if (!new_bus)
2591                 return -ENOMEM;
2592
2593         memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2594         new_bus->dev_count--;
2595         memcpy(new_bus->range + i, bus->range + i + 1,
2596                (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
2597
2598         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2599         synchronize_srcu_expedited(&kvm->srcu);
2600         kfree(bus);
2601         return r;
2602 }
2603
2604 static struct notifier_block kvm_cpu_notifier = {
2605         .notifier_call = kvm_cpu_hotplug,
2606 };
2607
2608 static int vm_stat_get(void *_offset, u64 *val)
2609 {
2610         unsigned offset = (long)_offset;
2611         struct kvm *kvm;
2612
2613         *val = 0;
2614         raw_spin_lock(&kvm_lock);
2615         list_for_each_entry(kvm, &vm_list, vm_list)
2616                 *val += *(u32 *)((void *)kvm + offset);
2617         raw_spin_unlock(&kvm_lock);
2618         return 0;
2619 }
2620
2621 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2622
2623 static int vcpu_stat_get(void *_offset, u64 *val)
2624 {
2625         unsigned offset = (long)_offset;
2626         struct kvm *kvm;
2627         struct kvm_vcpu *vcpu;
2628         int i;
2629
2630         *val = 0;
2631         raw_spin_lock(&kvm_lock);
2632         list_for_each_entry(kvm, &vm_list, vm_list)
2633                 kvm_for_each_vcpu(i, vcpu, kvm)
2634                         *val += *(u32 *)((void *)vcpu + offset);
2635
2636         raw_spin_unlock(&kvm_lock);
2637         return 0;
2638 }
2639
2640 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2641
2642 static const struct file_operations *stat_fops[] = {
2643         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2644         [KVM_STAT_VM]   = &vm_stat_fops,
2645 };
2646
2647 static int kvm_init_debug(void)
2648 {
2649         int r = -EFAULT;
2650         struct kvm_stats_debugfs_item *p;
2651
2652         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2653         if (kvm_debugfs_dir == NULL)
2654                 goto out;
2655
2656         for (p = debugfs_entries; p->name; ++p) {
2657                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2658                                                 (void *)(long)p->offset,
2659                                                 stat_fops[p->kind]);
2660                 if (p->dentry == NULL)
2661                         goto out_dir;
2662         }
2663
2664         return 0;
2665
2666 out_dir:
2667         debugfs_remove_recursive(kvm_debugfs_dir);
2668 out:
2669         return r;
2670 }
2671
2672 static void kvm_exit_debug(void)
2673 {
2674         struct kvm_stats_debugfs_item *p;
2675
2676         for (p = debugfs_entries; p->name; ++p)
2677                 debugfs_remove(p->dentry);
2678         debugfs_remove(kvm_debugfs_dir);
2679 }
2680
2681 static int kvm_suspend(void)
2682 {
2683         if (kvm_usage_count)
2684                 hardware_disable_nolock(NULL);
2685         return 0;
2686 }
2687
2688 static void kvm_resume(void)
2689 {
2690         if (kvm_usage_count) {
2691                 WARN_ON(raw_spin_is_locked(&kvm_lock));
2692                 hardware_enable_nolock(NULL);
2693         }
2694 }
2695
2696 static struct syscore_ops kvm_syscore_ops = {
2697         .suspend = kvm_suspend,
2698         .resume = kvm_resume,
2699 };
2700
2701 struct page *bad_page;
2702 pfn_t bad_pfn;
2703
2704 static inline
2705 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2706 {
2707         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2708 }
2709
2710 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2711 {
2712         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2713
2714         kvm_arch_vcpu_load(vcpu, cpu);
2715 }
2716
2717 static void kvm_sched_out(struct preempt_notifier *pn,
2718                           struct task_struct *next)
2719 {
2720         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2721
2722         kvm_arch_vcpu_put(vcpu);
2723 }
2724
2725 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2726                   struct module *module)
2727 {
2728         int r;
2729         int cpu;
2730
2731         r = kvm_arch_init(opaque);
2732         if (r)
2733                 goto out_fail;
2734
2735         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2736
2737         if (bad_page == NULL) {
2738                 r = -ENOMEM;
2739                 goto out;
2740         }
2741
2742         bad_pfn = page_to_pfn(bad_page);
2743
2744         hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2745
2746         if (hwpoison_page == NULL) {
2747                 r = -ENOMEM;
2748                 goto out_free_0;
2749         }
2750
2751         hwpoison_pfn = page_to_pfn(hwpoison_page);
2752
2753         fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2754
2755         if (fault_page == NULL) {
2756                 r = -ENOMEM;
2757                 goto out_free_0;
2758         }
2759
2760         fault_pfn = page_to_pfn(fault_page);
2761
2762         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2763                 r = -ENOMEM;
2764                 goto out_free_0;
2765         }
2766
2767         r = kvm_arch_hardware_setup();
2768         if (r < 0)
2769                 goto out_free_0a;
2770
2771         for_each_online_cpu(cpu) {
2772                 smp_call_function_single(cpu,
2773                                 kvm_arch_check_processor_compat,
2774                                 &r, 1);
2775                 if (r < 0)
2776                         goto out_free_1;
2777         }
2778
2779         r = register_cpu_notifier(&kvm_cpu_notifier);
2780         if (r)
2781                 goto out_free_2;
2782         register_reboot_notifier(&kvm_reboot_notifier);
2783
2784         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2785         if (!vcpu_align)
2786                 vcpu_align = __alignof__(struct kvm_vcpu);
2787         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2788                                            0, NULL);
2789         if (!kvm_vcpu_cache) {
2790                 r = -ENOMEM;
2791                 goto out_free_3;
2792         }
2793
2794         r = kvm_async_pf_init();
2795         if (r)
2796                 goto out_free;
2797
2798         kvm_chardev_ops.owner = module;
2799         kvm_vm_fops.owner = module;
2800         kvm_vcpu_fops.owner = module;
2801
2802         r = misc_register(&kvm_dev);
2803         if (r) {
2804                 printk(KERN_ERR "kvm: misc device register failed\n");
2805                 goto out_unreg;
2806         }
2807
2808         register_syscore_ops(&kvm_syscore_ops);
2809
2810         kvm_preempt_ops.sched_in = kvm_sched_in;
2811         kvm_preempt_ops.sched_out = kvm_sched_out;
2812
2813         r = kvm_init_debug();
2814         if (r) {
2815                 printk(KERN_ERR "kvm: create debugfs files failed\n");
2816                 goto out_undebugfs;
2817         }
2818
2819         return 0;
2820
2821 out_undebugfs:
2822         unregister_syscore_ops(&kvm_syscore_ops);
2823 out_unreg:
2824         kvm_async_pf_deinit();
2825 out_free:
2826         kmem_cache_destroy(kvm_vcpu_cache);
2827 out_free_3:
2828         unregister_reboot_notifier(&kvm_reboot_notifier);
2829         unregister_cpu_notifier(&kvm_cpu_notifier);
2830 out_free_2:
2831 out_free_1:
2832         kvm_arch_hardware_unsetup();
2833 out_free_0a:
2834         free_cpumask_var(cpus_hardware_enabled);
2835 out_free_0:
2836         if (fault_page)
2837                 __free_page(fault_page);
2838         if (hwpoison_page)
2839                 __free_page(hwpoison_page);
2840         __free_page(bad_page);
2841 out:
2842         kvm_arch_exit();
2843 out_fail:
2844         return r;
2845 }
2846 EXPORT_SYMBOL_GPL(kvm_init);
2847
2848 void kvm_exit(void)
2849 {
2850         kvm_exit_debug();
2851         misc_deregister(&kvm_dev);
2852         kmem_cache_destroy(kvm_vcpu_cache);
2853         kvm_async_pf_deinit();
2854         unregister_syscore_ops(&kvm_syscore_ops);
2855         unregister_reboot_notifier(&kvm_reboot_notifier);
2856         unregister_cpu_notifier(&kvm_cpu_notifier);
2857         on_each_cpu(hardware_disable_nolock, NULL, 1);
2858         kvm_arch_hardware_unsetup();
2859         kvm_arch_exit();
2860         free_cpumask_var(cpus_hardware_enabled);
2861         __free_page(fault_page);
2862         __free_page(hwpoison_page);
2863         __free_page(bad_page);
2864 }
2865 EXPORT_SYMBOL_GPL(kvm_exit);