a6e612fced737b034c61f90a4ea22fbd87a956da
[linux-2.6.git] / virt / kvm / kvm_main.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * This module enables machines with Intel VT-x extensions to run virtual
5  * machines without emulation or binary translation.
6  *
7  * Copyright (C) 2006 Qumranet, Inc.
8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
9  *
10  * Authors:
11  *   Avi Kivity   <avi@qumranet.com>
12  *   Yaniv Kamay  <yaniv@qumranet.com>
13  *
14  * This work is licensed under the terms of the GNU GPL, version 2.  See
15  * the COPYING file in the top-level directory.
16  *
17  */
18
19 #include "iodev.h"
20
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
26 #include <linux/mm.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
52
53 #include <asm/processor.h>
54 #include <asm/io.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
57
58 #include "coalesced_mmio.h"
59 #include "async_pf.h"
60
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
63
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
66
67 /*
68  * Ordering of locks:
69  *
70  *              kvm->lock --> kvm->slots_lock --> kvm->irq_lock
71  */
72
73 DEFINE_RAW_SPINLOCK(kvm_lock);
74 LIST_HEAD(vm_list);
75
76 static cpumask_var_t cpus_hardware_enabled;
77 static int kvm_usage_count = 0;
78 static atomic_t hardware_enable_failed;
79
80 struct kmem_cache *kvm_vcpu_cache;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
82
83 static __read_mostly struct preempt_ops kvm_preempt_ops;
84
85 struct dentry *kvm_debugfs_dir;
86
87 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
88                            unsigned long arg);
89 #ifdef CONFIG_COMPAT
90 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
91                                   unsigned long arg);
92 #endif
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
95
96 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
97
98 bool kvm_rebooting;
99 EXPORT_SYMBOL_GPL(kvm_rebooting);
100
101 static bool largepages_enabled = true;
102
103 static struct page *hwpoison_page;
104 static pfn_t hwpoison_pfn;
105
106 struct page *fault_page;
107 pfn_t fault_pfn;
108
109 inline int kvm_is_mmio_pfn(pfn_t pfn)
110 {
111         if (pfn_valid(pfn)) {
112                 int reserved;
113                 struct page *tail = pfn_to_page(pfn);
114                 struct page *head = compound_trans_head(tail);
115                 reserved = PageReserved(head);
116                 if (head != tail) {
117                         /*
118                          * "head" is not a dangling pointer
119                          * (compound_trans_head takes care of that)
120                          * but the hugepage may have been splitted
121                          * from under us (and we may not hold a
122                          * reference count on the head page so it can
123                          * be reused before we run PageReferenced), so
124                          * we've to check PageTail before returning
125                          * what we just read.
126                          */
127                         smp_rmb();
128                         if (PageTail(tail))
129                                 return reserved;
130                 }
131                 return PageReserved(tail);
132         }
133
134         return true;
135 }
136
137 /*
138  * Switches to specified vcpu, until a matching vcpu_put()
139  */
140 void vcpu_load(struct kvm_vcpu *vcpu)
141 {
142         int cpu;
143
144         mutex_lock(&vcpu->mutex);
145         if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
146                 /* The thread running this VCPU changed. */
147                 struct pid *oldpid = vcpu->pid;
148                 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
149                 rcu_assign_pointer(vcpu->pid, newpid);
150                 synchronize_rcu();
151                 put_pid(oldpid);
152         }
153         cpu = get_cpu();
154         preempt_notifier_register(&vcpu->preempt_notifier);
155         kvm_arch_vcpu_load(vcpu, cpu);
156         put_cpu();
157 }
158
159 void vcpu_put(struct kvm_vcpu *vcpu)
160 {
161         preempt_disable();
162         kvm_arch_vcpu_put(vcpu);
163         preempt_notifier_unregister(&vcpu->preempt_notifier);
164         preempt_enable();
165         mutex_unlock(&vcpu->mutex);
166 }
167
168 static void ack_flush(void *_completed)
169 {
170 }
171
172 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
173 {
174         int i, cpu, me;
175         cpumask_var_t cpus;
176         bool called = true;
177         struct kvm_vcpu *vcpu;
178
179         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
180
181         me = get_cpu();
182         kvm_for_each_vcpu(i, vcpu, kvm) {
183                 kvm_make_request(req, vcpu);
184                 cpu = vcpu->cpu;
185
186                 /* Set ->requests bit before we read ->mode */
187                 smp_mb();
188
189                 if (cpus != NULL && cpu != -1 && cpu != me &&
190                       kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
191                         cpumask_set_cpu(cpu, cpus);
192         }
193         if (unlikely(cpus == NULL))
194                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
195         else if (!cpumask_empty(cpus))
196                 smp_call_function_many(cpus, ack_flush, NULL, 1);
197         else
198                 called = false;
199         put_cpu();
200         free_cpumask_var(cpus);
201         return called;
202 }
203
204 void kvm_flush_remote_tlbs(struct kvm *kvm)
205 {
206         int dirty_count = kvm->tlbs_dirty;
207
208         smp_mb();
209         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
210                 ++kvm->stat.remote_tlb_flush;
211         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
212 }
213
214 void kvm_reload_remote_mmus(struct kvm *kvm)
215 {
216         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
217 }
218
219 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
220 {
221         struct page *page;
222         int r;
223
224         mutex_init(&vcpu->mutex);
225         vcpu->cpu = -1;
226         vcpu->kvm = kvm;
227         vcpu->vcpu_id = id;
228         vcpu->pid = NULL;
229         init_waitqueue_head(&vcpu->wq);
230         kvm_async_pf_vcpu_init(vcpu);
231
232         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
233         if (!page) {
234                 r = -ENOMEM;
235                 goto fail;
236         }
237         vcpu->run = page_address(page);
238
239         r = kvm_arch_vcpu_init(vcpu);
240         if (r < 0)
241                 goto fail_free_run;
242         return 0;
243
244 fail_free_run:
245         free_page((unsigned long)vcpu->run);
246 fail:
247         return r;
248 }
249 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
250
251 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
252 {
253         put_pid(vcpu->pid);
254         kvm_arch_vcpu_uninit(vcpu);
255         free_page((unsigned long)vcpu->run);
256 }
257 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
258
259 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
260 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
261 {
262         return container_of(mn, struct kvm, mmu_notifier);
263 }
264
265 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
266                                              struct mm_struct *mm,
267                                              unsigned long address)
268 {
269         struct kvm *kvm = mmu_notifier_to_kvm(mn);
270         int need_tlb_flush, idx;
271
272         /*
273          * When ->invalidate_page runs, the linux pte has been zapped
274          * already but the page is still allocated until
275          * ->invalidate_page returns. So if we increase the sequence
276          * here the kvm page fault will notice if the spte can't be
277          * established because the page is going to be freed. If
278          * instead the kvm page fault establishes the spte before
279          * ->invalidate_page runs, kvm_unmap_hva will release it
280          * before returning.
281          *
282          * The sequence increase only need to be seen at spin_unlock
283          * time, and not at spin_lock time.
284          *
285          * Increasing the sequence after the spin_unlock would be
286          * unsafe because the kvm page fault could then establish the
287          * pte after kvm_unmap_hva returned, without noticing the page
288          * is going to be freed.
289          */
290         idx = srcu_read_lock(&kvm->srcu);
291         spin_lock(&kvm->mmu_lock);
292         kvm->mmu_notifier_seq++;
293         need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
294         spin_unlock(&kvm->mmu_lock);
295         srcu_read_unlock(&kvm->srcu, idx);
296
297         /* we've to flush the tlb before the pages can be freed */
298         if (need_tlb_flush)
299                 kvm_flush_remote_tlbs(kvm);
300
301 }
302
303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
304                                         struct mm_struct *mm,
305                                         unsigned long address,
306                                         pte_t pte)
307 {
308         struct kvm *kvm = mmu_notifier_to_kvm(mn);
309         int idx;
310
311         idx = srcu_read_lock(&kvm->srcu);
312         spin_lock(&kvm->mmu_lock);
313         kvm->mmu_notifier_seq++;
314         kvm_set_spte_hva(kvm, address, pte);
315         spin_unlock(&kvm->mmu_lock);
316         srcu_read_unlock(&kvm->srcu, idx);
317 }
318
319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
320                                                     struct mm_struct *mm,
321                                                     unsigned long start,
322                                                     unsigned long end)
323 {
324         struct kvm *kvm = mmu_notifier_to_kvm(mn);
325         int need_tlb_flush = 0, idx;
326
327         idx = srcu_read_lock(&kvm->srcu);
328         spin_lock(&kvm->mmu_lock);
329         /*
330          * The count increase must become visible at unlock time as no
331          * spte can be established without taking the mmu_lock and
332          * count is also read inside the mmu_lock critical section.
333          */
334         kvm->mmu_notifier_count++;
335         for (; start < end; start += PAGE_SIZE)
336                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
337         need_tlb_flush |= kvm->tlbs_dirty;
338         spin_unlock(&kvm->mmu_lock);
339         srcu_read_unlock(&kvm->srcu, idx);
340
341         /* we've to flush the tlb before the pages can be freed */
342         if (need_tlb_flush)
343                 kvm_flush_remote_tlbs(kvm);
344 }
345
346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
347                                                   struct mm_struct *mm,
348                                                   unsigned long start,
349                                                   unsigned long end)
350 {
351         struct kvm *kvm = mmu_notifier_to_kvm(mn);
352
353         spin_lock(&kvm->mmu_lock);
354         /*
355          * This sequence increase will notify the kvm page fault that
356          * the page that is going to be mapped in the spte could have
357          * been freed.
358          */
359         kvm->mmu_notifier_seq++;
360         /*
361          * The above sequence increase must be visible before the
362          * below count decrease but both values are read by the kvm
363          * page fault under mmu_lock spinlock so we don't need to add
364          * a smb_wmb() here in between the two.
365          */
366         kvm->mmu_notifier_count--;
367         spin_unlock(&kvm->mmu_lock);
368
369         BUG_ON(kvm->mmu_notifier_count < 0);
370 }
371
372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
373                                               struct mm_struct *mm,
374                                               unsigned long address)
375 {
376         struct kvm *kvm = mmu_notifier_to_kvm(mn);
377         int young, idx;
378
379         idx = srcu_read_lock(&kvm->srcu);
380         spin_lock(&kvm->mmu_lock);
381         young = kvm_age_hva(kvm, address);
382         spin_unlock(&kvm->mmu_lock);
383         srcu_read_unlock(&kvm->srcu, idx);
384
385         if (young)
386                 kvm_flush_remote_tlbs(kvm);
387
388         return young;
389 }
390
391 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
392                                        struct mm_struct *mm,
393                                        unsigned long address)
394 {
395         struct kvm *kvm = mmu_notifier_to_kvm(mn);
396         int young, idx;
397
398         idx = srcu_read_lock(&kvm->srcu);
399         spin_lock(&kvm->mmu_lock);
400         young = kvm_test_age_hva(kvm, address);
401         spin_unlock(&kvm->mmu_lock);
402         srcu_read_unlock(&kvm->srcu, idx);
403
404         return young;
405 }
406
407 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
408                                      struct mm_struct *mm)
409 {
410         struct kvm *kvm = mmu_notifier_to_kvm(mn);
411         int idx;
412
413         idx = srcu_read_lock(&kvm->srcu);
414         kvm_arch_flush_shadow(kvm);
415         srcu_read_unlock(&kvm->srcu, idx);
416 }
417
418 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
419         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
420         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
421         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
422         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
423         .test_young             = kvm_mmu_notifier_test_young,
424         .change_pte             = kvm_mmu_notifier_change_pte,
425         .release                = kvm_mmu_notifier_release,
426 };
427
428 static int kvm_init_mmu_notifier(struct kvm *kvm)
429 {
430         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
431         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
432 }
433
434 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
435
436 static int kvm_init_mmu_notifier(struct kvm *kvm)
437 {
438         return 0;
439 }
440
441 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
442
443 static void kvm_init_memslots_id(struct kvm *kvm)
444 {
445         int i;
446         struct kvm_memslots *slots = kvm->memslots;
447
448         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
449                 slots->id_to_index[i] = slots->memslots[i].id = i;
450 }
451
452 static struct kvm *kvm_create_vm(void)
453 {
454         int r, i;
455         struct kvm *kvm = kvm_arch_alloc_vm();
456
457         if (!kvm)
458                 return ERR_PTR(-ENOMEM);
459
460         r = kvm_arch_init_vm(kvm);
461         if (r)
462                 goto out_err_nodisable;
463
464         r = hardware_enable_all();
465         if (r)
466                 goto out_err_nodisable;
467
468 #ifdef CONFIG_HAVE_KVM_IRQCHIP
469         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
470         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
471 #endif
472
473         r = -ENOMEM;
474         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
475         if (!kvm->memslots)
476                 goto out_err_nosrcu;
477         kvm_init_memslots_id(kvm);
478         if (init_srcu_struct(&kvm->srcu))
479                 goto out_err_nosrcu;
480         for (i = 0; i < KVM_NR_BUSES; i++) {
481                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
482                                         GFP_KERNEL);
483                 if (!kvm->buses[i])
484                         goto out_err;
485         }
486
487         spin_lock_init(&kvm->mmu_lock);
488         kvm->mm = current->mm;
489         atomic_inc(&kvm->mm->mm_count);
490         kvm_eventfd_init(kvm);
491         mutex_init(&kvm->lock);
492         mutex_init(&kvm->irq_lock);
493         mutex_init(&kvm->slots_lock);
494         atomic_set(&kvm->users_count, 1);
495
496         r = kvm_init_mmu_notifier(kvm);
497         if (r)
498                 goto out_err;
499
500         raw_spin_lock(&kvm_lock);
501         list_add(&kvm->vm_list, &vm_list);
502         raw_spin_unlock(&kvm_lock);
503
504         return kvm;
505
506 out_err:
507         cleanup_srcu_struct(&kvm->srcu);
508 out_err_nosrcu:
509         hardware_disable_all();
510 out_err_nodisable:
511         for (i = 0; i < KVM_NR_BUSES; i++)
512                 kfree(kvm->buses[i]);
513         kfree(kvm->memslots);
514         kvm_arch_free_vm(kvm);
515         return ERR_PTR(r);
516 }
517
518 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
519 {
520         if (!memslot->dirty_bitmap)
521                 return;
522
523         if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
524                 vfree(memslot->dirty_bitmap_head);
525         else
526                 kfree(memslot->dirty_bitmap_head);
527
528         memslot->dirty_bitmap = NULL;
529         memslot->dirty_bitmap_head = NULL;
530 }
531
532 /*
533  * Free any memory in @free but not in @dont.
534  */
535 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
536                                   struct kvm_memory_slot *dont)
537 {
538         int i;
539
540         if (!dont || free->rmap != dont->rmap)
541                 vfree(free->rmap);
542
543         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
544                 kvm_destroy_dirty_bitmap(free);
545
546
547         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
548                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
549                         vfree(free->lpage_info[i]);
550                         free->lpage_info[i] = NULL;
551                 }
552         }
553
554         free->npages = 0;
555         free->rmap = NULL;
556 }
557
558 void kvm_free_physmem(struct kvm *kvm)
559 {
560         struct kvm_memslots *slots = kvm->memslots;
561         struct kvm_memory_slot *memslot;
562
563         kvm_for_each_memslot(memslot, slots)
564                 kvm_free_physmem_slot(memslot, NULL);
565
566         kfree(kvm->memslots);
567 }
568
569 static void kvm_destroy_vm(struct kvm *kvm)
570 {
571         int i;
572         struct mm_struct *mm = kvm->mm;
573
574         kvm_arch_sync_events(kvm);
575         raw_spin_lock(&kvm_lock);
576         list_del(&kvm->vm_list);
577         raw_spin_unlock(&kvm_lock);
578         kvm_free_irq_routing(kvm);
579         for (i = 0; i < KVM_NR_BUSES; i++)
580                 kvm_io_bus_destroy(kvm->buses[i]);
581         kvm_coalesced_mmio_free(kvm);
582 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
583         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
584 #else
585         kvm_arch_flush_shadow(kvm);
586 #endif
587         kvm_arch_destroy_vm(kvm);
588         kvm_free_physmem(kvm);
589         cleanup_srcu_struct(&kvm->srcu);
590         kvm_arch_free_vm(kvm);
591         hardware_disable_all();
592         mmdrop(mm);
593 }
594
595 void kvm_get_kvm(struct kvm *kvm)
596 {
597         atomic_inc(&kvm->users_count);
598 }
599 EXPORT_SYMBOL_GPL(kvm_get_kvm);
600
601 void kvm_put_kvm(struct kvm *kvm)
602 {
603         if (atomic_dec_and_test(&kvm->users_count))
604                 kvm_destroy_vm(kvm);
605 }
606 EXPORT_SYMBOL_GPL(kvm_put_kvm);
607
608
609 static int kvm_vm_release(struct inode *inode, struct file *filp)
610 {
611         struct kvm *kvm = filp->private_data;
612
613         kvm_irqfd_release(kvm);
614
615         kvm_put_kvm(kvm);
616         return 0;
617 }
618
619 #ifndef CONFIG_S390
620 /*
621  * Allocation size is twice as large as the actual dirty bitmap size.
622  * This makes it possible to do double buffering: see x86's
623  * kvm_vm_ioctl_get_dirty_log().
624  */
625 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
626 {
627         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
628
629         if (dirty_bytes > PAGE_SIZE)
630                 memslot->dirty_bitmap = vzalloc(dirty_bytes);
631         else
632                 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
633
634         if (!memslot->dirty_bitmap)
635                 return -ENOMEM;
636
637         memslot->dirty_bitmap_head = memslot->dirty_bitmap;
638         memslot->nr_dirty_pages = 0;
639         return 0;
640 }
641 #endif /* !CONFIG_S390 */
642
643 static struct kvm_memory_slot *
644 search_memslots(struct kvm_memslots *slots, gfn_t gfn)
645 {
646         struct kvm_memory_slot *memslot;
647
648         kvm_for_each_memslot(memslot, slots)
649                 if (gfn >= memslot->base_gfn &&
650                       gfn < memslot->base_gfn + memslot->npages)
651                         return memslot;
652
653         return NULL;
654 }
655
656 static int cmp_memslot(const void *slot1, const void *slot2)
657 {
658         struct kvm_memory_slot *s1, *s2;
659
660         s1 = (struct kvm_memory_slot *)slot1;
661         s2 = (struct kvm_memory_slot *)slot2;
662
663         if (s1->npages < s2->npages)
664                 return 1;
665         if (s1->npages > s2->npages)
666                 return -1;
667
668         return 0;
669 }
670
671 /*
672  * Sort the memslots base on its size, so the larger slots
673  * will get better fit.
674  */
675 static void sort_memslots(struct kvm_memslots *slots)
676 {
677         int i;
678
679         sort(slots->memslots, KVM_MEM_SLOTS_NUM,
680               sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
681
682         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
683                 slots->id_to_index[slots->memslots[i].id] = i;
684 }
685
686 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
687 {
688         if (new) {
689                 int id = new->id;
690                 struct kvm_memory_slot *old = id_to_memslot(slots, id);
691                 unsigned long npages = old->npages;
692
693                 *old = *new;
694                 if (new->npages != npages)
695                         sort_memslots(slots);
696         }
697
698         slots->generation++;
699 }
700
701 /*
702  * Allocate some memory and give it an address in the guest physical address
703  * space.
704  *
705  * Discontiguous memory is allowed, mostly for framebuffers.
706  *
707  * Must be called holding mmap_sem for write.
708  */
709 int __kvm_set_memory_region(struct kvm *kvm,
710                             struct kvm_userspace_memory_region *mem,
711                             int user_alloc)
712 {
713         int r;
714         gfn_t base_gfn;
715         unsigned long npages;
716         unsigned long i;
717         struct kvm_memory_slot *memslot;
718         struct kvm_memory_slot old, new;
719         struct kvm_memslots *slots, *old_memslots;
720
721         r = -EINVAL;
722         /* General sanity checks */
723         if (mem->memory_size & (PAGE_SIZE - 1))
724                 goto out;
725         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
726                 goto out;
727         /* We can read the guest memory with __xxx_user() later on. */
728         if (user_alloc &&
729             ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
730              !access_ok(VERIFY_WRITE,
731                         (void __user *)(unsigned long)mem->userspace_addr,
732                         mem->memory_size)))
733                 goto out;
734         if (mem->slot >= KVM_MEM_SLOTS_NUM)
735                 goto out;
736         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
737                 goto out;
738
739         memslot = id_to_memslot(kvm->memslots, mem->slot);
740         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
741         npages = mem->memory_size >> PAGE_SHIFT;
742
743         r = -EINVAL;
744         if (npages > KVM_MEM_MAX_NR_PAGES)
745                 goto out;
746
747         if (!npages)
748                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
749
750         new = old = *memslot;
751
752         new.id = mem->slot;
753         new.base_gfn = base_gfn;
754         new.npages = npages;
755         new.flags = mem->flags;
756
757         /* Disallow changing a memory slot's size. */
758         r = -EINVAL;
759         if (npages && old.npages && npages != old.npages)
760                 goto out_free;
761
762         /* Check for overlaps */
763         r = -EEXIST;
764         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
765                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
766
767                 if (s == memslot || !s->npages)
768                         continue;
769                 if (!((base_gfn + npages <= s->base_gfn) ||
770                       (base_gfn >= s->base_gfn + s->npages)))
771                         goto out_free;
772         }
773
774         /* Free page dirty bitmap if unneeded */
775         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
776                 new.dirty_bitmap = NULL;
777
778         r = -ENOMEM;
779
780         /* Allocate if a slot is being created */
781 #ifndef CONFIG_S390
782         if (npages && !new.rmap) {
783                 new.rmap = vzalloc(npages * sizeof(*new.rmap));
784
785                 if (!new.rmap)
786                         goto out_free;
787
788                 new.user_alloc = user_alloc;
789                 new.userspace_addr = mem->userspace_addr;
790         }
791         if (!npages)
792                 goto skip_lpage;
793
794         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
795                 unsigned long ugfn;
796                 unsigned long j;
797                 int lpages;
798                 int level = i + 2;
799
800                 /* Avoid unused variable warning if no large pages */
801                 (void)level;
802
803                 if (new.lpage_info[i])
804                         continue;
805
806                 lpages = 1 + ((base_gfn + npages - 1)
807                              >> KVM_HPAGE_GFN_SHIFT(level));
808                 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
809
810                 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
811
812                 if (!new.lpage_info[i])
813                         goto out_free;
814
815                 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
816                         new.lpage_info[i][0].write_count = 1;
817                 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
818                         new.lpage_info[i][lpages - 1].write_count = 1;
819                 ugfn = new.userspace_addr >> PAGE_SHIFT;
820                 /*
821                  * If the gfn and userspace address are not aligned wrt each
822                  * other, or if explicitly asked to, disable large page
823                  * support for this slot
824                  */
825                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
826                     !largepages_enabled)
827                         for (j = 0; j < lpages; ++j)
828                                 new.lpage_info[i][j].write_count = 1;
829         }
830
831 skip_lpage:
832
833         /* Allocate page dirty bitmap if needed */
834         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
835                 if (kvm_create_dirty_bitmap(&new) < 0)
836                         goto out_free;
837                 /* destroy any largepage mappings for dirty tracking */
838         }
839 #else  /* not defined CONFIG_S390 */
840         new.user_alloc = user_alloc;
841         if (user_alloc)
842                 new.userspace_addr = mem->userspace_addr;
843 #endif /* not defined CONFIG_S390 */
844
845         if (!npages) {
846                 struct kvm_memory_slot *slot;
847
848                 r = -ENOMEM;
849                 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
850                                 GFP_KERNEL);
851                 if (!slots)
852                         goto out_free;
853                 slot = id_to_memslot(slots, mem->slot);
854                 slot->flags |= KVM_MEMSLOT_INVALID;
855
856                 update_memslots(slots, NULL);
857
858                 old_memslots = kvm->memslots;
859                 rcu_assign_pointer(kvm->memslots, slots);
860                 synchronize_srcu_expedited(&kvm->srcu);
861                 /* From this point no new shadow pages pointing to a deleted
862                  * memslot will be created.
863                  *
864                  * validation of sp->gfn happens in:
865                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
866                  *      - kvm_is_visible_gfn (mmu_check_roots)
867                  */
868                 kvm_arch_flush_shadow(kvm);
869                 kfree(old_memslots);
870         }
871
872         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
873         if (r)
874                 goto out_free;
875
876         /* map the pages in iommu page table */
877         if (npages) {
878                 r = kvm_iommu_map_pages(kvm, &new);
879                 if (r)
880                         goto out_free;
881         }
882
883         r = -ENOMEM;
884         slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
885                         GFP_KERNEL);
886         if (!slots)
887                 goto out_free;
888
889         /* actual memory is freed via old in kvm_free_physmem_slot below */
890         if (!npages) {
891                 new.rmap = NULL;
892                 new.dirty_bitmap = NULL;
893                 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
894                         new.lpage_info[i] = NULL;
895         }
896
897         update_memslots(slots, &new);
898         old_memslots = kvm->memslots;
899         rcu_assign_pointer(kvm->memslots, slots);
900         synchronize_srcu_expedited(&kvm->srcu);
901
902         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
903
904         /*
905          * If the new memory slot is created, we need to clear all
906          * mmio sptes.
907          */
908         if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
909                 kvm_arch_flush_shadow(kvm);
910
911         kvm_free_physmem_slot(&old, &new);
912         kfree(old_memslots);
913
914         return 0;
915
916 out_free:
917         kvm_free_physmem_slot(&new, &old);
918 out:
919         return r;
920
921 }
922 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
923
924 int kvm_set_memory_region(struct kvm *kvm,
925                           struct kvm_userspace_memory_region *mem,
926                           int user_alloc)
927 {
928         int r;
929
930         mutex_lock(&kvm->slots_lock);
931         r = __kvm_set_memory_region(kvm, mem, user_alloc);
932         mutex_unlock(&kvm->slots_lock);
933         return r;
934 }
935 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
936
937 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
938                                    struct
939                                    kvm_userspace_memory_region *mem,
940                                    int user_alloc)
941 {
942         if (mem->slot >= KVM_MEMORY_SLOTS)
943                 return -EINVAL;
944         return kvm_set_memory_region(kvm, mem, user_alloc);
945 }
946
947 int kvm_get_dirty_log(struct kvm *kvm,
948                         struct kvm_dirty_log *log, int *is_dirty)
949 {
950         struct kvm_memory_slot *memslot;
951         int r, i;
952         unsigned long n;
953         unsigned long any = 0;
954
955         r = -EINVAL;
956         if (log->slot >= KVM_MEMORY_SLOTS)
957                 goto out;
958
959         memslot = id_to_memslot(kvm->memslots, log->slot);
960         r = -ENOENT;
961         if (!memslot->dirty_bitmap)
962                 goto out;
963
964         n = kvm_dirty_bitmap_bytes(memslot);
965
966         for (i = 0; !any && i < n/sizeof(long); ++i)
967                 any = memslot->dirty_bitmap[i];
968
969         r = -EFAULT;
970         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
971                 goto out;
972
973         if (any)
974                 *is_dirty = 1;
975
976         r = 0;
977 out:
978         return r;
979 }
980
981 void kvm_disable_largepages(void)
982 {
983         largepages_enabled = false;
984 }
985 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
986
987 int is_error_page(struct page *page)
988 {
989         return page == bad_page || page == hwpoison_page || page == fault_page;
990 }
991 EXPORT_SYMBOL_GPL(is_error_page);
992
993 int is_error_pfn(pfn_t pfn)
994 {
995         return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
996 }
997 EXPORT_SYMBOL_GPL(is_error_pfn);
998
999 int is_hwpoison_pfn(pfn_t pfn)
1000 {
1001         return pfn == hwpoison_pfn;
1002 }
1003 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
1004
1005 int is_fault_pfn(pfn_t pfn)
1006 {
1007         return pfn == fault_pfn;
1008 }
1009 EXPORT_SYMBOL_GPL(is_fault_pfn);
1010
1011 int is_noslot_pfn(pfn_t pfn)
1012 {
1013         return pfn == bad_pfn;
1014 }
1015 EXPORT_SYMBOL_GPL(is_noslot_pfn);
1016
1017 int is_invalid_pfn(pfn_t pfn)
1018 {
1019         return pfn == hwpoison_pfn || pfn == fault_pfn;
1020 }
1021 EXPORT_SYMBOL_GPL(is_invalid_pfn);
1022
1023 static inline unsigned long bad_hva(void)
1024 {
1025         return PAGE_OFFSET;
1026 }
1027
1028 int kvm_is_error_hva(unsigned long addr)
1029 {
1030         return addr == bad_hva();
1031 }
1032 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1033
1034 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
1035                                                 gfn_t gfn)
1036 {
1037         return search_memslots(slots, gfn);
1038 }
1039
1040 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1041 {
1042         return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1043 }
1044 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1045
1046 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1047 {
1048         struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1049
1050         if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
1051               memslot->flags & KVM_MEMSLOT_INVALID)
1052                 return 0;
1053
1054         return 1;
1055 }
1056 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1057
1058 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1059 {
1060         struct vm_area_struct *vma;
1061         unsigned long addr, size;
1062
1063         size = PAGE_SIZE;
1064
1065         addr = gfn_to_hva(kvm, gfn);
1066         if (kvm_is_error_hva(addr))
1067                 return PAGE_SIZE;
1068
1069         down_read(&current->mm->mmap_sem);
1070         vma = find_vma(current->mm, addr);
1071         if (!vma)
1072                 goto out;
1073
1074         size = vma_kernel_pagesize(vma);
1075
1076 out:
1077         up_read(&current->mm->mmap_sem);
1078
1079         return size;
1080 }
1081
1082 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1083                                      gfn_t *nr_pages)
1084 {
1085         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1086                 return bad_hva();
1087
1088         if (nr_pages)
1089                 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1090
1091         return gfn_to_hva_memslot(slot, gfn);
1092 }
1093
1094 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1095 {
1096         return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1097 }
1098 EXPORT_SYMBOL_GPL(gfn_to_hva);
1099
1100 static pfn_t get_fault_pfn(void)
1101 {
1102         get_page(fault_page);
1103         return fault_pfn;
1104 }
1105
1106 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1107         unsigned long start, int write, struct page **page)
1108 {
1109         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1110
1111         if (write)
1112                 flags |= FOLL_WRITE;
1113
1114         return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1115 }
1116
1117 static inline int check_user_page_hwpoison(unsigned long addr)
1118 {
1119         int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1120
1121         rc = __get_user_pages(current, current->mm, addr, 1,
1122                               flags, NULL, NULL, NULL);
1123         return rc == -EHWPOISON;
1124 }
1125
1126 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1127                         bool *async, bool write_fault, bool *writable)
1128 {
1129         struct page *page[1];
1130         int npages = 0;
1131         pfn_t pfn;
1132
1133         /* we can do it either atomically or asynchronously, not both */
1134         BUG_ON(atomic && async);
1135
1136         BUG_ON(!write_fault && !writable);
1137
1138         if (writable)
1139                 *writable = true;
1140
1141         if (atomic || async)
1142                 npages = __get_user_pages_fast(addr, 1, 1, page);
1143
1144         if (unlikely(npages != 1) && !atomic) {
1145                 might_sleep();
1146
1147                 if (writable)
1148                         *writable = write_fault;
1149
1150                 if (async) {
1151                         down_read(&current->mm->mmap_sem);
1152                         npages = get_user_page_nowait(current, current->mm,
1153                                                      addr, write_fault, page);
1154                         up_read(&current->mm->mmap_sem);
1155                 } else
1156                         npages = get_user_pages_fast(addr, 1, write_fault,
1157                                                      page);
1158
1159                 /* map read fault as writable if possible */
1160                 if (unlikely(!write_fault) && npages == 1) {
1161                         struct page *wpage[1];
1162
1163                         npages = __get_user_pages_fast(addr, 1, 1, wpage);
1164                         if (npages == 1) {
1165                                 *writable = true;
1166                                 put_page(page[0]);
1167                                 page[0] = wpage[0];
1168                         }
1169                         npages = 1;
1170                 }
1171         }
1172
1173         if (unlikely(npages != 1)) {
1174                 struct vm_area_struct *vma;
1175
1176                 if (atomic)
1177                         return get_fault_pfn();
1178
1179                 down_read(&current->mm->mmap_sem);
1180                 if (npages == -EHWPOISON ||
1181                         (!async && check_user_page_hwpoison(addr))) {
1182                         up_read(&current->mm->mmap_sem);
1183                         get_page(hwpoison_page);
1184                         return page_to_pfn(hwpoison_page);
1185                 }
1186
1187                 vma = find_vma_intersection(current->mm, addr, addr+1);
1188
1189                 if (vma == NULL)
1190                         pfn = get_fault_pfn();
1191                 else if ((vma->vm_flags & VM_PFNMAP)) {
1192                         pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1193                                 vma->vm_pgoff;
1194                         BUG_ON(!kvm_is_mmio_pfn(pfn));
1195                 } else {
1196                         if (async && (vma->vm_flags & VM_WRITE))
1197                                 *async = true;
1198                         pfn = get_fault_pfn();
1199                 }
1200                 up_read(&current->mm->mmap_sem);
1201         } else
1202                 pfn = page_to_pfn(page[0]);
1203
1204         return pfn;
1205 }
1206
1207 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1208 {
1209         return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1210 }
1211 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1212
1213 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1214                           bool write_fault, bool *writable)
1215 {
1216         unsigned long addr;
1217
1218         if (async)
1219                 *async = false;
1220
1221         addr = gfn_to_hva(kvm, gfn);
1222         if (kvm_is_error_hva(addr)) {
1223                 get_page(bad_page);
1224                 return page_to_pfn(bad_page);
1225         }
1226
1227         return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1228 }
1229
1230 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1231 {
1232         return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1233 }
1234 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1235
1236 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1237                        bool write_fault, bool *writable)
1238 {
1239         return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1240 }
1241 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1242
1243 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1244 {
1245         return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1246 }
1247 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1248
1249 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1250                       bool *writable)
1251 {
1252         return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1253 }
1254 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1255
1256 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1257                          struct kvm_memory_slot *slot, gfn_t gfn)
1258 {
1259         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1260         return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1261 }
1262
1263 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1264                                                                   int nr_pages)
1265 {
1266         unsigned long addr;
1267         gfn_t entry;
1268
1269         addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1270         if (kvm_is_error_hva(addr))
1271                 return -1;
1272
1273         if (entry < nr_pages)
1274                 return 0;
1275
1276         return __get_user_pages_fast(addr, nr_pages, 1, pages);
1277 }
1278 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1279
1280 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1281 {
1282         pfn_t pfn;
1283
1284         pfn = gfn_to_pfn(kvm, gfn);
1285         if (!kvm_is_mmio_pfn(pfn))
1286                 return pfn_to_page(pfn);
1287
1288         WARN_ON(kvm_is_mmio_pfn(pfn));
1289
1290         get_page(bad_page);
1291         return bad_page;
1292 }
1293
1294 EXPORT_SYMBOL_GPL(gfn_to_page);
1295
1296 void kvm_release_page_clean(struct page *page)
1297 {
1298         kvm_release_pfn_clean(page_to_pfn(page));
1299 }
1300 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1301
1302 void kvm_release_pfn_clean(pfn_t pfn)
1303 {
1304         if (!kvm_is_mmio_pfn(pfn))
1305                 put_page(pfn_to_page(pfn));
1306 }
1307 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1308
1309 void kvm_release_page_dirty(struct page *page)
1310 {
1311         kvm_release_pfn_dirty(page_to_pfn(page));
1312 }
1313 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1314
1315 void kvm_release_pfn_dirty(pfn_t pfn)
1316 {
1317         kvm_set_pfn_dirty(pfn);
1318         kvm_release_pfn_clean(pfn);
1319 }
1320 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1321
1322 void kvm_set_page_dirty(struct page *page)
1323 {
1324         kvm_set_pfn_dirty(page_to_pfn(page));
1325 }
1326 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1327
1328 void kvm_set_pfn_dirty(pfn_t pfn)
1329 {
1330         if (!kvm_is_mmio_pfn(pfn)) {
1331                 struct page *page = pfn_to_page(pfn);
1332                 if (!PageReserved(page))
1333                         SetPageDirty(page);
1334         }
1335 }
1336 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1337
1338 void kvm_set_pfn_accessed(pfn_t pfn)
1339 {
1340         if (!kvm_is_mmio_pfn(pfn))
1341                 mark_page_accessed(pfn_to_page(pfn));
1342 }
1343 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1344
1345 void kvm_get_pfn(pfn_t pfn)
1346 {
1347         if (!kvm_is_mmio_pfn(pfn))
1348                 get_page(pfn_to_page(pfn));
1349 }
1350 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1351
1352 static int next_segment(unsigned long len, int offset)
1353 {
1354         if (len > PAGE_SIZE - offset)
1355                 return PAGE_SIZE - offset;
1356         else
1357                 return len;
1358 }
1359
1360 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1361                         int len)
1362 {
1363         int r;
1364         unsigned long addr;
1365
1366         addr = gfn_to_hva(kvm, gfn);
1367         if (kvm_is_error_hva(addr))
1368                 return -EFAULT;
1369         r = __copy_from_user(data, (void __user *)addr + offset, len);
1370         if (r)
1371                 return -EFAULT;
1372         return 0;
1373 }
1374 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1375
1376 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, 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_read_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 EXPORT_SYMBOL_GPL(kvm_read_guest);
1395
1396 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1397                           unsigned long len)
1398 {
1399         int r;
1400         unsigned long addr;
1401         gfn_t gfn = gpa >> PAGE_SHIFT;
1402         int offset = offset_in_page(gpa);
1403
1404         addr = gfn_to_hva(kvm, gfn);
1405         if (kvm_is_error_hva(addr))
1406                 return -EFAULT;
1407         pagefault_disable();
1408         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1409         pagefault_enable();
1410         if (r)
1411                 return -EFAULT;
1412         return 0;
1413 }
1414 EXPORT_SYMBOL(kvm_read_guest_atomic);
1415
1416 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1417                          int offset, int len)
1418 {
1419         int r;
1420         unsigned long addr;
1421
1422         addr = gfn_to_hva(kvm, gfn);
1423         if (kvm_is_error_hva(addr))
1424                 return -EFAULT;
1425         r = __copy_to_user((void __user *)addr + offset, data, len);
1426         if (r)
1427                 return -EFAULT;
1428         mark_page_dirty(kvm, gfn);
1429         return 0;
1430 }
1431 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1432
1433 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1434                     unsigned long len)
1435 {
1436         gfn_t gfn = gpa >> PAGE_SHIFT;
1437         int seg;
1438         int offset = offset_in_page(gpa);
1439         int ret;
1440
1441         while ((seg = next_segment(len, offset)) != 0) {
1442                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1443                 if (ret < 0)
1444                         return ret;
1445                 offset = 0;
1446                 len -= seg;
1447                 data += seg;
1448                 ++gfn;
1449         }
1450         return 0;
1451 }
1452
1453 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1454                               gpa_t gpa)
1455 {
1456         struct kvm_memslots *slots = kvm_memslots(kvm);
1457         int offset = offset_in_page(gpa);
1458         gfn_t gfn = gpa >> PAGE_SHIFT;
1459
1460         ghc->gpa = gpa;
1461         ghc->generation = slots->generation;
1462         ghc->memslot = __gfn_to_memslot(slots, gfn);
1463         ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1464         if (!kvm_is_error_hva(ghc->hva))
1465                 ghc->hva += offset;
1466         else
1467                 return -EFAULT;
1468
1469         return 0;
1470 }
1471 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1472
1473 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1474                            void *data, unsigned long len)
1475 {
1476         struct kvm_memslots *slots = kvm_memslots(kvm);
1477         int r;
1478
1479         if (slots->generation != ghc->generation)
1480                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1481
1482         if (kvm_is_error_hva(ghc->hva))
1483                 return -EFAULT;
1484
1485         r = __copy_to_user((void __user *)ghc->hva, data, len);
1486         if (r)
1487                 return -EFAULT;
1488         mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1489
1490         return 0;
1491 }
1492 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1493
1494 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1495                            void *data, unsigned long len)
1496 {
1497         struct kvm_memslots *slots = kvm_memslots(kvm);
1498         int r;
1499
1500         if (slots->generation != ghc->generation)
1501                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1502
1503         if (kvm_is_error_hva(ghc->hva))
1504                 return -EFAULT;
1505
1506         r = __copy_from_user(data, (void __user *)ghc->hva, len);
1507         if (r)
1508                 return -EFAULT;
1509
1510         return 0;
1511 }
1512 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1513
1514 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1515 {
1516         return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1517                                     offset, len);
1518 }
1519 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1520
1521 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1522 {
1523         gfn_t gfn = gpa >> PAGE_SHIFT;
1524         int seg;
1525         int offset = offset_in_page(gpa);
1526         int ret;
1527
1528         while ((seg = next_segment(len, offset)) != 0) {
1529                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1530                 if (ret < 0)
1531                         return ret;
1532                 offset = 0;
1533                 len -= seg;
1534                 ++gfn;
1535         }
1536         return 0;
1537 }
1538 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1539
1540 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1541                              gfn_t gfn)
1542 {
1543         if (memslot && memslot->dirty_bitmap) {
1544                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1545
1546                 if (!__test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap))
1547                         memslot->nr_dirty_pages++;
1548         }
1549 }
1550
1551 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1552 {
1553         struct kvm_memory_slot *memslot;
1554
1555         memslot = gfn_to_memslot(kvm, gfn);
1556         mark_page_dirty_in_slot(kvm, memslot, gfn);
1557 }
1558
1559 /*
1560  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1561  */
1562 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1563 {
1564         DEFINE_WAIT(wait);
1565
1566         for (;;) {
1567                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1568
1569                 if (kvm_arch_vcpu_runnable(vcpu)) {
1570                         kvm_make_request(KVM_REQ_UNHALT, vcpu);
1571                         break;
1572                 }
1573                 if (kvm_cpu_has_pending_timer(vcpu))
1574                         break;
1575                 if (signal_pending(current))
1576                         break;
1577
1578                 schedule();
1579         }
1580
1581         finish_wait(&vcpu->wq, &wait);
1582 }
1583
1584 void kvm_resched(struct kvm_vcpu *vcpu)
1585 {
1586         if (!need_resched())
1587                 return;
1588         cond_resched();
1589 }
1590 EXPORT_SYMBOL_GPL(kvm_resched);
1591
1592 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1593 {
1594         struct kvm *kvm = me->kvm;
1595         struct kvm_vcpu *vcpu;
1596         int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1597         int yielded = 0;
1598         int pass;
1599         int i;
1600
1601         /*
1602          * We boost the priority of a VCPU that is runnable but not
1603          * currently running, because it got preempted by something
1604          * else and called schedule in __vcpu_run.  Hopefully that
1605          * VCPU is holding the lock that we need and will release it.
1606          * We approximate round-robin by starting at the last boosted VCPU.
1607          */
1608         for (pass = 0; pass < 2 && !yielded; pass++) {
1609                 kvm_for_each_vcpu(i, vcpu, kvm) {
1610                         struct task_struct *task = NULL;
1611                         struct pid *pid;
1612                         if (!pass && i < last_boosted_vcpu) {
1613                                 i = last_boosted_vcpu;
1614                                 continue;
1615                         } else if (pass && i > last_boosted_vcpu)
1616                                 break;
1617                         if (vcpu == me)
1618                                 continue;
1619                         if (waitqueue_active(&vcpu->wq))
1620                                 continue;
1621                         rcu_read_lock();
1622                         pid = rcu_dereference(vcpu->pid);
1623                         if (pid)
1624                                 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1625                         rcu_read_unlock();
1626                         if (!task)
1627                                 continue;
1628                         if (task->flags & PF_VCPU) {
1629                                 put_task_struct(task);
1630                                 continue;
1631                         }
1632                         if (yield_to(task, 1)) {
1633                                 put_task_struct(task);
1634                                 kvm->last_boosted_vcpu = i;
1635                                 yielded = 1;
1636                                 break;
1637                         }
1638                         put_task_struct(task);
1639                 }
1640         }
1641 }
1642 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1643
1644 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1645 {
1646         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1647         struct page *page;
1648
1649         if (vmf->pgoff == 0)
1650                 page = virt_to_page(vcpu->run);
1651 #ifdef CONFIG_X86
1652         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1653                 page = virt_to_page(vcpu->arch.pio_data);
1654 #endif
1655 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1656         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1657                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1658 #endif
1659         else
1660                 return VM_FAULT_SIGBUS;
1661         get_page(page);
1662         vmf->page = page;
1663         return 0;
1664 }
1665
1666 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1667         .fault = kvm_vcpu_fault,
1668 };
1669
1670 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1671 {
1672         vma->vm_ops = &kvm_vcpu_vm_ops;
1673         return 0;
1674 }
1675
1676 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1677 {
1678         struct kvm_vcpu *vcpu = filp->private_data;
1679
1680         kvm_put_kvm(vcpu->kvm);
1681         return 0;
1682 }
1683
1684 static struct file_operations kvm_vcpu_fops = {
1685         .release        = kvm_vcpu_release,
1686         .unlocked_ioctl = kvm_vcpu_ioctl,
1687 #ifdef CONFIG_COMPAT
1688         .compat_ioctl   = kvm_vcpu_compat_ioctl,
1689 #endif
1690         .mmap           = kvm_vcpu_mmap,
1691         .llseek         = noop_llseek,
1692 };
1693
1694 /*
1695  * Allocates an inode for the vcpu.
1696  */
1697 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1698 {
1699         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1700 }
1701
1702 /*
1703  * Creates some virtual cpus.  Good luck creating more than one.
1704  */
1705 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1706 {
1707         int r;
1708         struct kvm_vcpu *vcpu, *v;
1709
1710         vcpu = kvm_arch_vcpu_create(kvm, id);
1711         if (IS_ERR(vcpu))
1712                 return PTR_ERR(vcpu);
1713
1714         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1715
1716         r = kvm_arch_vcpu_setup(vcpu);
1717         if (r)
1718                 goto vcpu_destroy;
1719
1720         mutex_lock(&kvm->lock);
1721         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1722                 r = -EINVAL;
1723                 goto unlock_vcpu_destroy;
1724         }
1725
1726         kvm_for_each_vcpu(r, v, kvm)
1727                 if (v->vcpu_id == id) {
1728                         r = -EEXIST;
1729                         goto unlock_vcpu_destroy;
1730                 }
1731
1732         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1733
1734         /* Now it's all set up, let userspace reach it */
1735         kvm_get_kvm(kvm);
1736         r = create_vcpu_fd(vcpu);
1737         if (r < 0) {
1738                 kvm_put_kvm(kvm);
1739                 goto unlock_vcpu_destroy;
1740         }
1741
1742         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1743         smp_wmb();
1744         atomic_inc(&kvm->online_vcpus);
1745
1746 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1747         if (kvm->bsp_vcpu_id == id)
1748                 kvm->bsp_vcpu = vcpu;
1749 #endif
1750         mutex_unlock(&kvm->lock);
1751         return r;
1752
1753 unlock_vcpu_destroy:
1754         mutex_unlock(&kvm->lock);
1755 vcpu_destroy:
1756         kvm_arch_vcpu_destroy(vcpu);
1757         return r;
1758 }
1759
1760 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1761 {
1762         if (sigset) {
1763                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1764                 vcpu->sigset_active = 1;
1765                 vcpu->sigset = *sigset;
1766         } else
1767                 vcpu->sigset_active = 0;
1768         return 0;
1769 }
1770
1771 static long kvm_vcpu_ioctl(struct file *filp,
1772                            unsigned int ioctl, unsigned long arg)
1773 {
1774         struct kvm_vcpu *vcpu = filp->private_data;
1775         void __user *argp = (void __user *)arg;
1776         int r;
1777         struct kvm_fpu *fpu = NULL;
1778         struct kvm_sregs *kvm_sregs = NULL;
1779
1780         if (vcpu->kvm->mm != current->mm)
1781                 return -EIO;
1782
1783 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1784         /*
1785          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1786          * so vcpu_load() would break it.
1787          */
1788         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1789                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1790 #endif
1791
1792
1793         vcpu_load(vcpu);
1794         switch (ioctl) {
1795         case KVM_RUN:
1796                 r = -EINVAL;
1797                 if (arg)
1798                         goto out;
1799                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1800                 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1801                 break;
1802         case KVM_GET_REGS: {
1803                 struct kvm_regs *kvm_regs;
1804
1805                 r = -ENOMEM;
1806                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1807                 if (!kvm_regs)
1808                         goto out;
1809                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1810                 if (r)
1811                         goto out_free1;
1812                 r = -EFAULT;
1813                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1814                         goto out_free1;
1815                 r = 0;
1816 out_free1:
1817                 kfree(kvm_regs);
1818                 break;
1819         }
1820         case KVM_SET_REGS: {
1821                 struct kvm_regs *kvm_regs;
1822
1823                 r = -ENOMEM;
1824                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1825                 if (!kvm_regs)
1826                         goto out;
1827                 r = -EFAULT;
1828                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1829                         goto out_free2;
1830                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1831                 if (r)
1832                         goto out_free2;
1833                 r = 0;
1834 out_free2:
1835                 kfree(kvm_regs);
1836                 break;
1837         }
1838         case KVM_GET_SREGS: {
1839                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1840                 r = -ENOMEM;
1841                 if (!kvm_sregs)
1842                         goto out;
1843                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1844                 if (r)
1845                         goto out;
1846                 r = -EFAULT;
1847                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1848                         goto out;
1849                 r = 0;
1850                 break;
1851         }
1852         case KVM_SET_SREGS: {
1853                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1854                 r = -ENOMEM;
1855                 if (!kvm_sregs)
1856                         goto out;
1857                 r = -EFAULT;
1858                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1859                         goto out;
1860                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1861                 if (r)
1862                         goto out;
1863                 r = 0;
1864                 break;
1865         }
1866         case KVM_GET_MP_STATE: {
1867                 struct kvm_mp_state mp_state;
1868
1869                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1870                 if (r)
1871                         goto out;
1872                 r = -EFAULT;
1873                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1874                         goto out;
1875                 r = 0;
1876                 break;
1877         }
1878         case KVM_SET_MP_STATE: {
1879                 struct kvm_mp_state mp_state;
1880
1881                 r = -EFAULT;
1882                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1883                         goto out;
1884                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1885                 if (r)
1886                         goto out;
1887                 r = 0;
1888                 break;
1889         }
1890         case KVM_TRANSLATE: {
1891                 struct kvm_translation tr;
1892
1893                 r = -EFAULT;
1894                 if (copy_from_user(&tr, argp, sizeof tr))
1895                         goto out;
1896                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1897                 if (r)
1898                         goto out;
1899                 r = -EFAULT;
1900                 if (copy_to_user(argp, &tr, sizeof tr))
1901                         goto out;
1902                 r = 0;
1903                 break;
1904         }
1905         case KVM_SET_GUEST_DEBUG: {
1906                 struct kvm_guest_debug dbg;
1907
1908                 r = -EFAULT;
1909                 if (copy_from_user(&dbg, argp, sizeof dbg))
1910                         goto out;
1911                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1912                 if (r)
1913                         goto out;
1914                 r = 0;
1915                 break;
1916         }
1917         case KVM_SET_SIGNAL_MASK: {
1918                 struct kvm_signal_mask __user *sigmask_arg = argp;
1919                 struct kvm_signal_mask kvm_sigmask;
1920                 sigset_t sigset, *p;
1921
1922                 p = NULL;
1923                 if (argp) {
1924                         r = -EFAULT;
1925                         if (copy_from_user(&kvm_sigmask, argp,
1926                                            sizeof kvm_sigmask))
1927                                 goto out;
1928                         r = -EINVAL;
1929                         if (kvm_sigmask.len != sizeof sigset)
1930                                 goto out;
1931                         r = -EFAULT;
1932                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1933                                            sizeof sigset))
1934                                 goto out;
1935                         p = &sigset;
1936                 }
1937                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1938                 break;
1939         }
1940         case KVM_GET_FPU: {
1941                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1942                 r = -ENOMEM;
1943                 if (!fpu)
1944                         goto out;
1945                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1946                 if (r)
1947                         goto out;
1948                 r = -EFAULT;
1949                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1950                         goto out;
1951                 r = 0;
1952                 break;
1953         }
1954         case KVM_SET_FPU: {
1955                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1956                 r = -ENOMEM;
1957                 if (!fpu)
1958                         goto out;
1959                 r = -EFAULT;
1960                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1961                         goto out;
1962                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1963                 if (r)
1964                         goto out;
1965                 r = 0;
1966                 break;
1967         }
1968         default:
1969                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1970         }
1971 out:
1972         vcpu_put(vcpu);
1973         kfree(fpu);
1974         kfree(kvm_sregs);
1975         return r;
1976 }
1977
1978 #ifdef CONFIG_COMPAT
1979 static long kvm_vcpu_compat_ioctl(struct file *filp,
1980                                   unsigned int ioctl, unsigned long arg)
1981 {
1982         struct kvm_vcpu *vcpu = filp->private_data;
1983         void __user *argp = compat_ptr(arg);
1984         int r;
1985
1986         if (vcpu->kvm->mm != current->mm)
1987                 return -EIO;
1988
1989         switch (ioctl) {
1990         case KVM_SET_SIGNAL_MASK: {
1991                 struct kvm_signal_mask __user *sigmask_arg = argp;
1992                 struct kvm_signal_mask kvm_sigmask;
1993                 compat_sigset_t csigset;
1994                 sigset_t sigset;
1995
1996                 if (argp) {
1997                         r = -EFAULT;
1998                         if (copy_from_user(&kvm_sigmask, argp,
1999                                            sizeof kvm_sigmask))
2000                                 goto out;
2001                         r = -EINVAL;
2002                         if (kvm_sigmask.len != sizeof csigset)
2003                                 goto out;
2004                         r = -EFAULT;
2005                         if (copy_from_user(&csigset, sigmask_arg->sigset,
2006                                            sizeof csigset))
2007                                 goto out;
2008                 }
2009                 sigset_from_compat(&sigset, &csigset);
2010                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2011                 break;
2012         }
2013         default:
2014                 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2015         }
2016
2017 out:
2018         return r;
2019 }
2020 #endif
2021
2022 static long kvm_vm_ioctl(struct file *filp,
2023                            unsigned int ioctl, unsigned long arg)
2024 {
2025         struct kvm *kvm = filp->private_data;
2026         void __user *argp = (void __user *)arg;
2027         int r;
2028
2029         if (kvm->mm != current->mm)
2030                 return -EIO;
2031         switch (ioctl) {
2032         case KVM_CREATE_VCPU:
2033                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2034                 if (r < 0)
2035                         goto out;
2036                 break;
2037         case KVM_SET_USER_MEMORY_REGION: {
2038                 struct kvm_userspace_memory_region kvm_userspace_mem;
2039
2040                 r = -EFAULT;
2041                 if (copy_from_user(&kvm_userspace_mem, argp,
2042                                                 sizeof kvm_userspace_mem))
2043                         goto out;
2044
2045                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2046                 if (r)
2047                         goto out;
2048                 break;
2049         }
2050         case KVM_GET_DIRTY_LOG: {
2051                 struct kvm_dirty_log log;
2052
2053                 r = -EFAULT;
2054                 if (copy_from_user(&log, argp, sizeof log))
2055                         goto out;
2056                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2057                 if (r)
2058                         goto out;
2059                 break;
2060         }
2061 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2062         case KVM_REGISTER_COALESCED_MMIO: {
2063                 struct kvm_coalesced_mmio_zone zone;
2064                 r = -EFAULT;
2065                 if (copy_from_user(&zone, argp, sizeof zone))
2066                         goto out;
2067                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2068                 if (r)
2069                         goto out;
2070                 r = 0;
2071                 break;
2072         }
2073         case KVM_UNREGISTER_COALESCED_MMIO: {
2074                 struct kvm_coalesced_mmio_zone zone;
2075                 r = -EFAULT;
2076                 if (copy_from_user(&zone, argp, sizeof zone))
2077                         goto out;
2078                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2079                 if (r)
2080                         goto out;
2081                 r = 0;
2082                 break;
2083         }
2084 #endif
2085         case KVM_IRQFD: {
2086                 struct kvm_irqfd data;
2087
2088                 r = -EFAULT;
2089                 if (copy_from_user(&data, argp, sizeof data))
2090                         goto out;
2091                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2092                 break;
2093         }
2094         case KVM_IOEVENTFD: {
2095                 struct kvm_ioeventfd data;
2096
2097                 r = -EFAULT;
2098                 if (copy_from_user(&data, argp, sizeof data))
2099                         goto out;
2100                 r = kvm_ioeventfd(kvm, &data);
2101                 break;
2102         }
2103 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2104         case KVM_SET_BOOT_CPU_ID:
2105                 r = 0;
2106                 mutex_lock(&kvm->lock);
2107                 if (atomic_read(&kvm->online_vcpus) != 0)
2108                         r = -EBUSY;
2109                 else
2110                         kvm->bsp_vcpu_id = arg;
2111                 mutex_unlock(&kvm->lock);
2112                 break;
2113 #endif
2114         default:
2115                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2116                 if (r == -ENOTTY)
2117                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2118         }
2119 out:
2120         return r;
2121 }
2122
2123 #ifdef CONFIG_COMPAT
2124 struct compat_kvm_dirty_log {
2125         __u32 slot;
2126         __u32 padding1;
2127         union {
2128                 compat_uptr_t dirty_bitmap; /* one bit per page */
2129                 __u64 padding2;
2130         };
2131 };
2132
2133 static long kvm_vm_compat_ioctl(struct file *filp,
2134                            unsigned int ioctl, unsigned long arg)
2135 {
2136         struct kvm *kvm = filp->private_data;
2137         int r;
2138
2139         if (kvm->mm != current->mm)
2140                 return -EIO;
2141         switch (ioctl) {
2142         case KVM_GET_DIRTY_LOG: {
2143                 struct compat_kvm_dirty_log compat_log;
2144                 struct kvm_dirty_log log;
2145
2146                 r = -EFAULT;
2147                 if (copy_from_user(&compat_log, (void __user *)arg,
2148                                    sizeof(compat_log)))
2149                         goto out;
2150                 log.slot         = compat_log.slot;
2151                 log.padding1     = compat_log.padding1;
2152                 log.padding2     = compat_log.padding2;
2153                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2154
2155                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2156                 if (r)
2157                         goto out;
2158                 break;
2159         }
2160         default:
2161                 r = kvm_vm_ioctl(filp, ioctl, arg);
2162         }
2163
2164 out:
2165         return r;
2166 }
2167 #endif
2168
2169 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2170 {
2171         struct page *page[1];
2172         unsigned long addr;
2173         int npages;
2174         gfn_t gfn = vmf->pgoff;
2175         struct kvm *kvm = vma->vm_file->private_data;
2176
2177         addr = gfn_to_hva(kvm, gfn);
2178         if (kvm_is_error_hva(addr))
2179                 return VM_FAULT_SIGBUS;
2180
2181         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2182                                 NULL);
2183         if (unlikely(npages != 1))
2184                 return VM_FAULT_SIGBUS;
2185
2186         vmf->page = page[0];
2187         return 0;
2188 }
2189
2190 static const struct vm_operations_struct kvm_vm_vm_ops = {
2191         .fault = kvm_vm_fault,
2192 };
2193
2194 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2195 {
2196         vma->vm_ops = &kvm_vm_vm_ops;
2197         return 0;
2198 }
2199
2200 static struct file_operations kvm_vm_fops = {
2201         .release        = kvm_vm_release,
2202         .unlocked_ioctl = kvm_vm_ioctl,
2203 #ifdef CONFIG_COMPAT
2204         .compat_ioctl   = kvm_vm_compat_ioctl,
2205 #endif
2206         .mmap           = kvm_vm_mmap,
2207         .llseek         = noop_llseek,
2208 };
2209
2210 static int kvm_dev_ioctl_create_vm(void)
2211 {
2212         int r;
2213         struct kvm *kvm;
2214
2215         kvm = kvm_create_vm();
2216         if (IS_ERR(kvm))
2217                 return PTR_ERR(kvm);
2218 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2219         r = kvm_coalesced_mmio_init(kvm);
2220         if (r < 0) {
2221                 kvm_put_kvm(kvm);
2222                 return r;
2223         }
2224 #endif
2225         r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2226         if (r < 0)
2227                 kvm_put_kvm(kvm);
2228
2229         return r;
2230 }
2231
2232 static long kvm_dev_ioctl_check_extension_generic(long arg)
2233 {
2234         switch (arg) {
2235         case KVM_CAP_USER_MEMORY:
2236         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2237         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2238 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2239         case KVM_CAP_SET_BOOT_CPU_ID:
2240 #endif
2241         case KVM_CAP_INTERNAL_ERROR_DATA:
2242                 return 1;
2243 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2244         case KVM_CAP_IRQ_ROUTING:
2245                 return KVM_MAX_IRQ_ROUTES;
2246 #endif
2247         default:
2248                 break;
2249         }
2250         return kvm_dev_ioctl_check_extension(arg);
2251 }
2252
2253 static long kvm_dev_ioctl(struct file *filp,
2254                           unsigned int ioctl, unsigned long arg)
2255 {
2256         long r = -EINVAL;
2257
2258         switch (ioctl) {
2259         case KVM_GET_API_VERSION:
2260                 r = -EINVAL;
2261                 if (arg)
2262                         goto out;
2263                 r = KVM_API_VERSION;
2264                 break;
2265         case KVM_CREATE_VM:
2266                 r = -EINVAL;
2267                 if (arg)
2268                         goto out;
2269                 r = kvm_dev_ioctl_create_vm();
2270                 break;
2271         case KVM_CHECK_EXTENSION:
2272                 r = kvm_dev_ioctl_check_extension_generic(arg);
2273                 break;
2274         case KVM_GET_VCPU_MMAP_SIZE:
2275                 r = -EINVAL;
2276                 if (arg)
2277                         goto out;
2278                 r = PAGE_SIZE;     /* struct kvm_run */
2279 #ifdef CONFIG_X86
2280                 r += PAGE_SIZE;    /* pio data page */
2281 #endif
2282 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2283                 r += PAGE_SIZE;    /* coalesced mmio ring page */
2284 #endif
2285                 break;
2286         case KVM_TRACE_ENABLE:
2287         case KVM_TRACE_PAUSE:
2288         case KVM_TRACE_DISABLE:
2289                 r = -EOPNOTSUPP;
2290                 break;
2291         default:
2292                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2293         }
2294 out:
2295         return r;
2296 }
2297
2298 static struct file_operations kvm_chardev_ops = {
2299         .unlocked_ioctl = kvm_dev_ioctl,
2300         .compat_ioctl   = kvm_dev_ioctl,
2301         .llseek         = noop_llseek,
2302 };
2303
2304 static struct miscdevice kvm_dev = {
2305         KVM_MINOR,
2306         "kvm",
2307         &kvm_chardev_ops,
2308 };
2309
2310 static void hardware_enable_nolock(void *junk)
2311 {
2312         int cpu = raw_smp_processor_id();
2313         int r;
2314
2315         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2316                 return;
2317
2318         cpumask_set_cpu(cpu, cpus_hardware_enabled);
2319
2320         r = kvm_arch_hardware_enable(NULL);
2321
2322         if (r) {
2323                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2324                 atomic_inc(&hardware_enable_failed);
2325                 printk(KERN_INFO "kvm: enabling virtualization on "
2326                                  "CPU%d failed\n", cpu);
2327         }
2328 }
2329
2330 static void hardware_enable(void *junk)
2331 {
2332         raw_spin_lock(&kvm_lock);
2333         hardware_enable_nolock(junk);
2334         raw_spin_unlock(&kvm_lock);
2335 }
2336
2337 static void hardware_disable_nolock(void *junk)
2338 {
2339         int cpu = raw_smp_processor_id();
2340
2341         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2342                 return;
2343         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2344         kvm_arch_hardware_disable(NULL);
2345 }
2346
2347 static void hardware_disable(void *junk)
2348 {
2349         raw_spin_lock(&kvm_lock);
2350         hardware_disable_nolock(junk);
2351         raw_spin_unlock(&kvm_lock);
2352 }
2353
2354 static void hardware_disable_all_nolock(void)
2355 {
2356         BUG_ON(!kvm_usage_count);
2357
2358         kvm_usage_count--;
2359         if (!kvm_usage_count)
2360                 on_each_cpu(hardware_disable_nolock, NULL, 1);
2361 }
2362
2363 static void hardware_disable_all(void)
2364 {
2365         raw_spin_lock(&kvm_lock);
2366         hardware_disable_all_nolock();
2367         raw_spin_unlock(&kvm_lock);
2368 }
2369
2370 static int hardware_enable_all(void)
2371 {
2372         int r = 0;
2373
2374         raw_spin_lock(&kvm_lock);
2375
2376         kvm_usage_count++;
2377         if (kvm_usage_count == 1) {
2378                 atomic_set(&hardware_enable_failed, 0);
2379                 on_each_cpu(hardware_enable_nolock, NULL, 1);
2380
2381                 if (atomic_read(&hardware_enable_failed)) {
2382                         hardware_disable_all_nolock();
2383                         r = -EBUSY;
2384                 }
2385         }
2386
2387         raw_spin_unlock(&kvm_lock);
2388
2389         return r;
2390 }
2391
2392 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2393                            void *v)
2394 {
2395         int cpu = (long)v;
2396
2397         if (!kvm_usage_count)
2398                 return NOTIFY_OK;
2399
2400         val &= ~CPU_TASKS_FROZEN;
2401         switch (val) {
2402         case CPU_DYING:
2403                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2404                        cpu);
2405                 hardware_disable(NULL);
2406                 break;
2407         case CPU_STARTING:
2408                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2409                        cpu);
2410                 hardware_enable(NULL);
2411                 break;
2412         }
2413         return NOTIFY_OK;
2414 }
2415
2416
2417 asmlinkage void kvm_spurious_fault(void)
2418 {
2419         /* Fault while not rebooting.  We want the trace. */
2420         BUG();
2421 }
2422 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2423
2424 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2425                       void *v)
2426 {
2427         /*
2428          * Some (well, at least mine) BIOSes hang on reboot if
2429          * in vmx root mode.
2430          *
2431          * And Intel TXT required VMX off for all cpu when system shutdown.
2432          */
2433         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2434         kvm_rebooting = true;
2435         on_each_cpu(hardware_disable_nolock, NULL, 1);
2436         return NOTIFY_OK;
2437 }
2438
2439 static struct notifier_block kvm_reboot_notifier = {
2440         .notifier_call = kvm_reboot,
2441         .priority = 0,
2442 };
2443
2444 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2445 {
2446         int i;
2447
2448         for (i = 0; i < bus->dev_count; i++) {
2449                 struct kvm_io_device *pos = bus->range[i].dev;
2450
2451                 kvm_iodevice_destructor(pos);
2452         }
2453         kfree(bus);
2454 }
2455
2456 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2457 {
2458         const struct kvm_io_range *r1 = p1;
2459         const struct kvm_io_range *r2 = p2;
2460
2461         if (r1->addr < r2->addr)
2462                 return -1;
2463         if (r1->addr + r1->len > r2->addr + r2->len)
2464                 return 1;
2465         return 0;
2466 }
2467
2468 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2469                           gpa_t addr, int len)
2470 {
2471         if (bus->dev_count == NR_IOBUS_DEVS)
2472                 return -ENOSPC;
2473
2474         bus->range[bus->dev_count++] = (struct kvm_io_range) {
2475                 .addr = addr,
2476                 .len = len,
2477                 .dev = dev,
2478         };
2479
2480         sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2481                 kvm_io_bus_sort_cmp, NULL);
2482
2483         return 0;
2484 }
2485
2486 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2487                              gpa_t addr, int len)
2488 {
2489         struct kvm_io_range *range, key;
2490         int off;
2491
2492         key = (struct kvm_io_range) {
2493                 .addr = addr,
2494                 .len = len,
2495         };
2496
2497         range = bsearch(&key, bus->range, bus->dev_count,
2498                         sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2499         if (range == NULL)
2500                 return -ENOENT;
2501
2502         off = range - bus->range;
2503
2504         while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2505                 off--;
2506
2507         return off;
2508 }
2509
2510 /* kvm_io_bus_write - called under kvm->slots_lock */
2511 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2512                      int len, const void *val)
2513 {
2514         int idx;
2515         struct kvm_io_bus *bus;
2516         struct kvm_io_range range;
2517
2518         range = (struct kvm_io_range) {
2519                 .addr = addr,
2520                 .len = len,
2521         };
2522
2523         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2524         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2525         if (idx < 0)
2526                 return -EOPNOTSUPP;
2527
2528         while (idx < bus->dev_count &&
2529                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2530                 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2531                         return 0;
2532                 idx++;
2533         }
2534
2535         return -EOPNOTSUPP;
2536 }
2537
2538 /* kvm_io_bus_read - called under kvm->slots_lock */
2539 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2540                     int len, void *val)
2541 {
2542         int idx;
2543         struct kvm_io_bus *bus;
2544         struct kvm_io_range range;
2545
2546         range = (struct kvm_io_range) {
2547                 .addr = addr,
2548                 .len = len,
2549         };
2550
2551         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2552         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2553         if (idx < 0)
2554                 return -EOPNOTSUPP;
2555
2556         while (idx < bus->dev_count &&
2557                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2558                 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2559                         return 0;
2560                 idx++;
2561         }
2562
2563         return -EOPNOTSUPP;
2564 }
2565
2566 /* Caller must hold slots_lock. */
2567 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2568                             int len, struct kvm_io_device *dev)
2569 {
2570         struct kvm_io_bus *new_bus, *bus;
2571
2572         bus = kvm->buses[bus_idx];
2573         if (bus->dev_count > NR_IOBUS_DEVS-1)
2574                 return -ENOSPC;
2575
2576         new_bus = kmemdup(bus, sizeof(struct kvm_io_bus), GFP_KERNEL);
2577         if (!new_bus)
2578                 return -ENOMEM;
2579         kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2580         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2581         synchronize_srcu_expedited(&kvm->srcu);
2582         kfree(bus);
2583
2584         return 0;
2585 }
2586
2587 /* Caller must hold slots_lock. */
2588 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2589                               struct kvm_io_device *dev)
2590 {
2591         int i, r;
2592         struct kvm_io_bus *new_bus, *bus;
2593
2594         bus = kvm->buses[bus_idx];
2595
2596         new_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL);
2597         if (!new_bus)
2598                 return -ENOMEM;
2599
2600         r = -ENOENT;
2601         for (i = 0; i < new_bus->dev_count; i++)
2602                 if (new_bus->range[i].dev == dev) {
2603                         r = 0;
2604                         new_bus->dev_count--;
2605                         new_bus->range[i] = new_bus->range[new_bus->dev_count];
2606                         sort(new_bus->range, new_bus->dev_count,
2607                              sizeof(struct kvm_io_range),
2608                              kvm_io_bus_sort_cmp, NULL);
2609                         break;
2610                 }
2611
2612         if (r) {
2613                 kfree(new_bus);
2614                 return r;
2615         }
2616
2617         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2618         synchronize_srcu_expedited(&kvm->srcu);
2619         kfree(bus);
2620         return r;
2621 }
2622
2623 static struct notifier_block kvm_cpu_notifier = {
2624         .notifier_call = kvm_cpu_hotplug,
2625 };
2626
2627 static int vm_stat_get(void *_offset, u64 *val)
2628 {
2629         unsigned offset = (long)_offset;
2630         struct kvm *kvm;
2631
2632         *val = 0;
2633         raw_spin_lock(&kvm_lock);
2634         list_for_each_entry(kvm, &vm_list, vm_list)
2635                 *val += *(u32 *)((void *)kvm + offset);
2636         raw_spin_unlock(&kvm_lock);
2637         return 0;
2638 }
2639
2640 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2641
2642 static int vcpu_stat_get(void *_offset, u64 *val)
2643 {
2644         unsigned offset = (long)_offset;
2645         struct kvm *kvm;
2646         struct kvm_vcpu *vcpu;
2647         int i;
2648
2649         *val = 0;
2650         raw_spin_lock(&kvm_lock);
2651         list_for_each_entry(kvm, &vm_list, vm_list)
2652                 kvm_for_each_vcpu(i, vcpu, kvm)
2653                         *val += *(u32 *)((void *)vcpu + offset);
2654
2655         raw_spin_unlock(&kvm_lock);
2656         return 0;
2657 }
2658
2659 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2660
2661 static const struct file_operations *stat_fops[] = {
2662         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2663         [KVM_STAT_VM]   = &vm_stat_fops,
2664 };
2665
2666 static void kvm_init_debug(void)
2667 {
2668         struct kvm_stats_debugfs_item *p;
2669
2670         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2671         for (p = debugfs_entries; p->name; ++p)
2672                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2673                                                 (void *)(long)p->offset,
2674                                                 stat_fops[p->kind]);
2675 }
2676
2677 static void kvm_exit_debug(void)
2678 {
2679         struct kvm_stats_debugfs_item *p;
2680
2681         for (p = debugfs_entries; p->name; ++p)
2682                 debugfs_remove(p->dentry);
2683         debugfs_remove(kvm_debugfs_dir);
2684 }
2685
2686 static int kvm_suspend(void)
2687 {
2688         if (kvm_usage_count)
2689                 hardware_disable_nolock(NULL);
2690         return 0;
2691 }
2692
2693 static void kvm_resume(void)
2694 {
2695         if (kvm_usage_count) {
2696                 WARN_ON(raw_spin_is_locked(&kvm_lock));
2697                 hardware_enable_nolock(NULL);
2698         }
2699 }
2700
2701 static struct syscore_ops kvm_syscore_ops = {
2702         .suspend = kvm_suspend,
2703         .resume = kvm_resume,
2704 };
2705
2706 struct page *bad_page;
2707 pfn_t bad_pfn;
2708
2709 static inline
2710 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2711 {
2712         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2713 }
2714
2715 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2716 {
2717         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2718
2719         kvm_arch_vcpu_load(vcpu, cpu);
2720 }
2721
2722 static void kvm_sched_out(struct preempt_notifier *pn,
2723                           struct task_struct *next)
2724 {
2725         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2726
2727         kvm_arch_vcpu_put(vcpu);
2728 }
2729
2730 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2731                   struct module *module)
2732 {
2733         int r;
2734         int cpu;
2735
2736         r = kvm_arch_init(opaque);
2737         if (r)
2738                 goto out_fail;
2739
2740         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2741
2742         if (bad_page == NULL) {
2743                 r = -ENOMEM;
2744                 goto out;
2745         }
2746
2747         bad_pfn = page_to_pfn(bad_page);
2748
2749         hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2750
2751         if (hwpoison_page == NULL) {
2752                 r = -ENOMEM;
2753                 goto out_free_0;
2754         }
2755
2756         hwpoison_pfn = page_to_pfn(hwpoison_page);
2757
2758         fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2759
2760         if (fault_page == NULL) {
2761                 r = -ENOMEM;
2762                 goto out_free_0;
2763         }
2764
2765         fault_pfn = page_to_pfn(fault_page);
2766
2767         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2768                 r = -ENOMEM;
2769                 goto out_free_0;
2770         }
2771
2772         r = kvm_arch_hardware_setup();
2773         if (r < 0)
2774                 goto out_free_0a;
2775
2776         for_each_online_cpu(cpu) {
2777                 smp_call_function_single(cpu,
2778                                 kvm_arch_check_processor_compat,
2779                                 &r, 1);
2780                 if (r < 0)
2781                         goto out_free_1;
2782         }
2783
2784         r = register_cpu_notifier(&kvm_cpu_notifier);
2785         if (r)
2786                 goto out_free_2;
2787         register_reboot_notifier(&kvm_reboot_notifier);
2788
2789         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2790         if (!vcpu_align)
2791                 vcpu_align = __alignof__(struct kvm_vcpu);
2792         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2793                                            0, NULL);
2794         if (!kvm_vcpu_cache) {
2795                 r = -ENOMEM;
2796                 goto out_free_3;
2797         }
2798
2799         r = kvm_async_pf_init();
2800         if (r)
2801                 goto out_free;
2802
2803         kvm_chardev_ops.owner = module;
2804         kvm_vm_fops.owner = module;
2805         kvm_vcpu_fops.owner = module;
2806
2807         r = misc_register(&kvm_dev);
2808         if (r) {
2809                 printk(KERN_ERR "kvm: misc device register failed\n");
2810                 goto out_unreg;
2811         }
2812
2813         register_syscore_ops(&kvm_syscore_ops);
2814
2815         kvm_preempt_ops.sched_in = kvm_sched_in;
2816         kvm_preempt_ops.sched_out = kvm_sched_out;
2817
2818         kvm_init_debug();
2819
2820         return 0;
2821
2822 out_unreg:
2823         kvm_async_pf_deinit();
2824 out_free:
2825         kmem_cache_destroy(kvm_vcpu_cache);
2826 out_free_3:
2827         unregister_reboot_notifier(&kvm_reboot_notifier);
2828         unregister_cpu_notifier(&kvm_cpu_notifier);
2829 out_free_2:
2830 out_free_1:
2831         kvm_arch_hardware_unsetup();
2832 out_free_0a:
2833         free_cpumask_var(cpus_hardware_enabled);
2834 out_free_0:
2835         if (fault_page)
2836                 __free_page(fault_page);
2837         if (hwpoison_page)
2838                 __free_page(hwpoison_page);
2839         __free_page(bad_page);
2840 out:
2841         kvm_arch_exit();
2842 out_fail:
2843         return r;
2844 }
2845 EXPORT_SYMBOL_GPL(kvm_init);
2846
2847 void kvm_exit(void)
2848 {
2849         kvm_exit_debug();
2850         misc_deregister(&kvm_dev);
2851         kmem_cache_destroy(kvm_vcpu_cache);
2852         kvm_async_pf_deinit();
2853         unregister_syscore_ops(&kvm_syscore_ops);
2854         unregister_reboot_notifier(&kvm_reboot_notifier);
2855         unregister_cpu_notifier(&kvm_cpu_notifier);
2856         on_each_cpu(hardware_disable_nolock, NULL, 1);
2857         kvm_arch_hardware_unsetup();
2858         kvm_arch_exit();
2859         free_cpumask_var(cpus_hardware_enabled);
2860         __free_page(hwpoison_page);
2861         __free_page(bad_page);
2862 }
2863 EXPORT_SYMBOL_GPL(kvm_exit);