KVM: Allow browsing memslots with mmu_lock
[linux-2.6.git] / virt / kvm / kvm_main.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * This module enables machines with Intel VT-x extensions to run virtual
5  * machines without emulation or binary translation.
6  *
7  * Copyright (C) 2006 Qumranet, Inc.
8  *
9  * Authors:
10  *   Avi Kivity   <avi@qumranet.com>
11  *   Yaniv Kamay  <yaniv@qumranet.com>
12  *
13  * This work is licensed under the terms of the GNU GPL, version 2.  See
14  * the COPYING file in the top-level directory.
15  *
16  */
17
18 #include "iodev.h"
19
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
26 #include <linux/mm.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44
45 #include <asm/processor.h>
46 #include <asm/io.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
49
50 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
51 #include "coalesced_mmio.h"
52 #endif
53
54 MODULE_AUTHOR("Qumranet");
55 MODULE_LICENSE("GPL");
56
57 DEFINE_SPINLOCK(kvm_lock);
58 LIST_HEAD(vm_list);
59
60 static cpumask_t cpus_hardware_enabled;
61
62 struct kmem_cache *kvm_vcpu_cache;
63 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
64
65 static __read_mostly struct preempt_ops kvm_preempt_ops;
66
67 struct dentry *kvm_debugfs_dir;
68
69 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
70                            unsigned long arg);
71
72 bool kvm_rebooting;
73
74 static inline int valid_vcpu(int n)
75 {
76         return likely(n >= 0 && n < KVM_MAX_VCPUS);
77 }
78
79 /*
80  * Switches to specified vcpu, until a matching vcpu_put()
81  */
82 void vcpu_load(struct kvm_vcpu *vcpu)
83 {
84         int cpu;
85
86         mutex_lock(&vcpu->mutex);
87         cpu = get_cpu();
88         preempt_notifier_register(&vcpu->preempt_notifier);
89         kvm_arch_vcpu_load(vcpu, cpu);
90         put_cpu();
91 }
92
93 void vcpu_put(struct kvm_vcpu *vcpu)
94 {
95         preempt_disable();
96         kvm_arch_vcpu_put(vcpu);
97         preempt_notifier_unregister(&vcpu->preempt_notifier);
98         preempt_enable();
99         mutex_unlock(&vcpu->mutex);
100 }
101
102 static void ack_flush(void *_completed)
103 {
104 }
105
106 void kvm_flush_remote_tlbs(struct kvm *kvm)
107 {
108         int i, cpu, me;
109         cpumask_t cpus;
110         struct kvm_vcpu *vcpu;
111
112         me = get_cpu();
113         cpus_clear(cpus);
114         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
115                 vcpu = kvm->vcpus[i];
116                 if (!vcpu)
117                         continue;
118                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
119                         continue;
120                 cpu = vcpu->cpu;
121                 if (cpu != -1 && cpu != me)
122                         cpu_set(cpu, cpus);
123         }
124         if (cpus_empty(cpus))
125                 goto out;
126         ++kvm->stat.remote_tlb_flush;
127         smp_call_function_mask(cpus, ack_flush, NULL, 1);
128 out:
129         put_cpu();
130 }
131
132 void kvm_reload_remote_mmus(struct kvm *kvm)
133 {
134         int i, cpu, me;
135         cpumask_t cpus;
136         struct kvm_vcpu *vcpu;
137
138         me = get_cpu();
139         cpus_clear(cpus);
140         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
141                 vcpu = kvm->vcpus[i];
142                 if (!vcpu)
143                         continue;
144                 if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
145                         continue;
146                 cpu = vcpu->cpu;
147                 if (cpu != -1 && cpu != me)
148                         cpu_set(cpu, cpus);
149         }
150         if (cpus_empty(cpus))
151                 goto out;
152         smp_call_function_mask(cpus, ack_flush, NULL, 1);
153 out:
154         put_cpu();
155 }
156
157
158 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
159 {
160         struct page *page;
161         int r;
162
163         mutex_init(&vcpu->mutex);
164         vcpu->cpu = -1;
165         vcpu->kvm = kvm;
166         vcpu->vcpu_id = id;
167         init_waitqueue_head(&vcpu->wq);
168
169         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
170         if (!page) {
171                 r = -ENOMEM;
172                 goto fail;
173         }
174         vcpu->run = page_address(page);
175
176         r = kvm_arch_vcpu_init(vcpu);
177         if (r < 0)
178                 goto fail_free_run;
179         return 0;
180
181 fail_free_run:
182         free_page((unsigned long)vcpu->run);
183 fail:
184         return r;
185 }
186 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
187
188 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
189 {
190         kvm_arch_vcpu_uninit(vcpu);
191         free_page((unsigned long)vcpu->run);
192 }
193 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
194
195 static struct kvm *kvm_create_vm(void)
196 {
197         struct kvm *kvm = kvm_arch_create_vm();
198 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
199         struct page *page;
200 #endif
201
202         if (IS_ERR(kvm))
203                 goto out;
204
205 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
206         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
207         if (!page) {
208                 kfree(kvm);
209                 return ERR_PTR(-ENOMEM);
210         }
211         kvm->coalesced_mmio_ring =
212                         (struct kvm_coalesced_mmio_ring *)page_address(page);
213 #endif
214
215         kvm->mm = current->mm;
216         atomic_inc(&kvm->mm->mm_count);
217         spin_lock_init(&kvm->mmu_lock);
218         kvm_io_bus_init(&kvm->pio_bus);
219         mutex_init(&kvm->lock);
220         kvm_io_bus_init(&kvm->mmio_bus);
221         init_rwsem(&kvm->slots_lock);
222         atomic_set(&kvm->users_count, 1);
223         spin_lock(&kvm_lock);
224         list_add(&kvm->vm_list, &vm_list);
225         spin_unlock(&kvm_lock);
226 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
227         kvm_coalesced_mmio_init(kvm);
228 #endif
229 out:
230         return kvm;
231 }
232
233 /*
234  * Free any memory in @free but not in @dont.
235  */
236 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
237                                   struct kvm_memory_slot *dont)
238 {
239         if (!dont || free->rmap != dont->rmap)
240                 vfree(free->rmap);
241
242         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
243                 vfree(free->dirty_bitmap);
244
245         if (!dont || free->lpage_info != dont->lpage_info)
246                 vfree(free->lpage_info);
247
248         free->npages = 0;
249         free->dirty_bitmap = NULL;
250         free->rmap = NULL;
251         free->lpage_info = NULL;
252 }
253
254 void kvm_free_physmem(struct kvm *kvm)
255 {
256         int i;
257
258         for (i = 0; i < kvm->nmemslots; ++i)
259                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
260 }
261
262 static void kvm_destroy_vm(struct kvm *kvm)
263 {
264         struct mm_struct *mm = kvm->mm;
265
266         spin_lock(&kvm_lock);
267         list_del(&kvm->vm_list);
268         spin_unlock(&kvm_lock);
269         kvm_io_bus_destroy(&kvm->pio_bus);
270         kvm_io_bus_destroy(&kvm->mmio_bus);
271 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
272         if (kvm->coalesced_mmio_ring != NULL)
273                 free_page((unsigned long)kvm->coalesced_mmio_ring);
274 #endif
275         kvm_arch_destroy_vm(kvm);
276         mmdrop(mm);
277 }
278
279 void kvm_get_kvm(struct kvm *kvm)
280 {
281         atomic_inc(&kvm->users_count);
282 }
283 EXPORT_SYMBOL_GPL(kvm_get_kvm);
284
285 void kvm_put_kvm(struct kvm *kvm)
286 {
287         if (atomic_dec_and_test(&kvm->users_count))
288                 kvm_destroy_vm(kvm);
289 }
290 EXPORT_SYMBOL_GPL(kvm_put_kvm);
291
292
293 static int kvm_vm_release(struct inode *inode, struct file *filp)
294 {
295         struct kvm *kvm = filp->private_data;
296
297         kvm_put_kvm(kvm);
298         return 0;
299 }
300
301 /*
302  * Allocate some memory and give it an address in the guest physical address
303  * space.
304  *
305  * Discontiguous memory is allowed, mostly for framebuffers.
306  *
307  * Must be called holding mmap_sem for write.
308  */
309 int __kvm_set_memory_region(struct kvm *kvm,
310                             struct kvm_userspace_memory_region *mem,
311                             int user_alloc)
312 {
313         int r;
314         gfn_t base_gfn;
315         unsigned long npages;
316         unsigned long i;
317         struct kvm_memory_slot *memslot;
318         struct kvm_memory_slot old, new;
319
320         r = -EINVAL;
321         /* General sanity checks */
322         if (mem->memory_size & (PAGE_SIZE - 1))
323                 goto out;
324         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
325                 goto out;
326         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
327                 goto out;
328         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
329                 goto out;
330
331         memslot = &kvm->memslots[mem->slot];
332         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
333         npages = mem->memory_size >> PAGE_SHIFT;
334
335         if (!npages)
336                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
337
338         new = old = *memslot;
339
340         new.base_gfn = base_gfn;
341         new.npages = npages;
342         new.flags = mem->flags;
343
344         /* Disallow changing a memory slot's size. */
345         r = -EINVAL;
346         if (npages && old.npages && npages != old.npages)
347                 goto out_free;
348
349         /* Check for overlaps */
350         r = -EEXIST;
351         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
352                 struct kvm_memory_slot *s = &kvm->memslots[i];
353
354                 if (s == memslot)
355                         continue;
356                 if (!((base_gfn + npages <= s->base_gfn) ||
357                       (base_gfn >= s->base_gfn + s->npages)))
358                         goto out_free;
359         }
360
361         /* Free page dirty bitmap if unneeded */
362         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
363                 new.dirty_bitmap = NULL;
364
365         r = -ENOMEM;
366
367         /* Allocate if a slot is being created */
368 #ifndef CONFIG_S390
369         if (npages && !new.rmap) {
370                 new.rmap = vmalloc(npages * sizeof(struct page *));
371
372                 if (!new.rmap)
373                         goto out_free;
374
375                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
376
377                 new.user_alloc = user_alloc;
378                 /*
379                  * hva_to_rmmap() serialzies with the mmu_lock and to be
380                  * safe it has to ignore memslots with !user_alloc &&
381                  * !userspace_addr.
382                  */
383                 if (user_alloc)
384                         new.userspace_addr = mem->userspace_addr;
385                 else
386                         new.userspace_addr = 0;
387         }
388         if (npages && !new.lpage_info) {
389                 int largepages = npages / KVM_PAGES_PER_HPAGE;
390                 if (npages % KVM_PAGES_PER_HPAGE)
391                         largepages++;
392                 if (base_gfn % KVM_PAGES_PER_HPAGE)
393                         largepages++;
394
395                 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
396
397                 if (!new.lpage_info)
398                         goto out_free;
399
400                 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
401
402                 if (base_gfn % KVM_PAGES_PER_HPAGE)
403                         new.lpage_info[0].write_count = 1;
404                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
405                         new.lpage_info[largepages-1].write_count = 1;
406         }
407
408         /* Allocate page dirty bitmap if needed */
409         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
410                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
411
412                 new.dirty_bitmap = vmalloc(dirty_bytes);
413                 if (!new.dirty_bitmap)
414                         goto out_free;
415                 memset(new.dirty_bitmap, 0, dirty_bytes);
416         }
417 #endif /* not defined CONFIG_S390 */
418
419         if (!npages)
420                 kvm_arch_flush_shadow(kvm);
421
422         spin_lock(&kvm->mmu_lock);
423         if (mem->slot >= kvm->nmemslots)
424                 kvm->nmemslots = mem->slot + 1;
425
426         *memslot = new;
427         spin_unlock(&kvm->mmu_lock);
428
429         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
430         if (r) {
431                 spin_lock(&kvm->mmu_lock);
432                 *memslot = old;
433                 spin_unlock(&kvm->mmu_lock);
434                 goto out_free;
435         }
436
437         kvm_free_physmem_slot(&old, &new);
438         return 0;
439
440 out_free:
441         kvm_free_physmem_slot(&new, &old);
442 out:
443         return r;
444
445 }
446 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
447
448 int kvm_set_memory_region(struct kvm *kvm,
449                           struct kvm_userspace_memory_region *mem,
450                           int user_alloc)
451 {
452         int r;
453
454         down_write(&kvm->slots_lock);
455         r = __kvm_set_memory_region(kvm, mem, user_alloc);
456         up_write(&kvm->slots_lock);
457         return r;
458 }
459 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
460
461 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
462                                    struct
463                                    kvm_userspace_memory_region *mem,
464                                    int user_alloc)
465 {
466         if (mem->slot >= KVM_MEMORY_SLOTS)
467                 return -EINVAL;
468         return kvm_set_memory_region(kvm, mem, user_alloc);
469 }
470
471 int kvm_get_dirty_log(struct kvm *kvm,
472                         struct kvm_dirty_log *log, int *is_dirty)
473 {
474         struct kvm_memory_slot *memslot;
475         int r, i;
476         int n;
477         unsigned long any = 0;
478
479         r = -EINVAL;
480         if (log->slot >= KVM_MEMORY_SLOTS)
481                 goto out;
482
483         memslot = &kvm->memslots[log->slot];
484         r = -ENOENT;
485         if (!memslot->dirty_bitmap)
486                 goto out;
487
488         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
489
490         for (i = 0; !any && i < n/sizeof(long); ++i)
491                 any = memslot->dirty_bitmap[i];
492
493         r = -EFAULT;
494         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
495                 goto out;
496
497         if (any)
498                 *is_dirty = 1;
499
500         r = 0;
501 out:
502         return r;
503 }
504
505 int is_error_page(struct page *page)
506 {
507         return page == bad_page;
508 }
509 EXPORT_SYMBOL_GPL(is_error_page);
510
511 int is_error_pfn(pfn_t pfn)
512 {
513         return pfn == bad_pfn;
514 }
515 EXPORT_SYMBOL_GPL(is_error_pfn);
516
517 static inline unsigned long bad_hva(void)
518 {
519         return PAGE_OFFSET;
520 }
521
522 int kvm_is_error_hva(unsigned long addr)
523 {
524         return addr == bad_hva();
525 }
526 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
527
528 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
529 {
530         int i;
531
532         for (i = 0; i < kvm->nmemslots; ++i) {
533                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
534
535                 if (gfn >= memslot->base_gfn
536                     && gfn < memslot->base_gfn + memslot->npages)
537                         return memslot;
538         }
539         return NULL;
540 }
541
542 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
543 {
544         gfn = unalias_gfn(kvm, gfn);
545         return __gfn_to_memslot(kvm, gfn);
546 }
547
548 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
549 {
550         int i;
551
552         gfn = unalias_gfn(kvm, gfn);
553         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
554                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
555
556                 if (gfn >= memslot->base_gfn
557                     && gfn < memslot->base_gfn + memslot->npages)
558                         return 1;
559         }
560         return 0;
561 }
562 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
563
564 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
565 {
566         struct kvm_memory_slot *slot;
567
568         gfn = unalias_gfn(kvm, gfn);
569         slot = __gfn_to_memslot(kvm, gfn);
570         if (!slot)
571                 return bad_hva();
572         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
573 }
574 EXPORT_SYMBOL_GPL(gfn_to_hva);
575
576 /*
577  * Requires current->mm->mmap_sem to be held
578  */
579 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
580 {
581         struct page *page[1];
582         unsigned long addr;
583         int npages;
584         pfn_t pfn;
585
586         might_sleep();
587
588         addr = gfn_to_hva(kvm, gfn);
589         if (kvm_is_error_hva(addr)) {
590                 get_page(bad_page);
591                 return page_to_pfn(bad_page);
592         }
593
594         npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
595                                 NULL);
596
597         if (unlikely(npages != 1)) {
598                 struct vm_area_struct *vma;
599
600                 vma = find_vma(current->mm, addr);
601                 if (vma == NULL || addr < vma->vm_start ||
602                     !(vma->vm_flags & VM_PFNMAP)) {
603                         get_page(bad_page);
604                         return page_to_pfn(bad_page);
605                 }
606
607                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
608                 BUG_ON(pfn_valid(pfn));
609         } else
610                 pfn = page_to_pfn(page[0]);
611
612         return pfn;
613 }
614
615 EXPORT_SYMBOL_GPL(gfn_to_pfn);
616
617 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
618 {
619         pfn_t pfn;
620
621         pfn = gfn_to_pfn(kvm, gfn);
622         if (pfn_valid(pfn))
623                 return pfn_to_page(pfn);
624
625         WARN_ON(!pfn_valid(pfn));
626
627         get_page(bad_page);
628         return bad_page;
629 }
630
631 EXPORT_SYMBOL_GPL(gfn_to_page);
632
633 void kvm_release_page_clean(struct page *page)
634 {
635         kvm_release_pfn_clean(page_to_pfn(page));
636 }
637 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
638
639 void kvm_release_pfn_clean(pfn_t pfn)
640 {
641         if (pfn_valid(pfn))
642                 put_page(pfn_to_page(pfn));
643 }
644 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
645
646 void kvm_release_page_dirty(struct page *page)
647 {
648         kvm_release_pfn_dirty(page_to_pfn(page));
649 }
650 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
651
652 void kvm_release_pfn_dirty(pfn_t pfn)
653 {
654         kvm_set_pfn_dirty(pfn);
655         kvm_release_pfn_clean(pfn);
656 }
657 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
658
659 void kvm_set_page_dirty(struct page *page)
660 {
661         kvm_set_pfn_dirty(page_to_pfn(page));
662 }
663 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
664
665 void kvm_set_pfn_dirty(pfn_t pfn)
666 {
667         if (pfn_valid(pfn)) {
668                 struct page *page = pfn_to_page(pfn);
669                 if (!PageReserved(page))
670                         SetPageDirty(page);
671         }
672 }
673 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
674
675 void kvm_set_pfn_accessed(pfn_t pfn)
676 {
677         if (pfn_valid(pfn))
678                 mark_page_accessed(pfn_to_page(pfn));
679 }
680 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
681
682 void kvm_get_pfn(pfn_t pfn)
683 {
684         if (pfn_valid(pfn))
685                 get_page(pfn_to_page(pfn));
686 }
687 EXPORT_SYMBOL_GPL(kvm_get_pfn);
688
689 static int next_segment(unsigned long len, int offset)
690 {
691         if (len > PAGE_SIZE - offset)
692                 return PAGE_SIZE - offset;
693         else
694                 return len;
695 }
696
697 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
698                         int len)
699 {
700         int r;
701         unsigned long addr;
702
703         addr = gfn_to_hva(kvm, gfn);
704         if (kvm_is_error_hva(addr))
705                 return -EFAULT;
706         r = copy_from_user(data, (void __user *)addr + offset, len);
707         if (r)
708                 return -EFAULT;
709         return 0;
710 }
711 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
712
713 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
714 {
715         gfn_t gfn = gpa >> PAGE_SHIFT;
716         int seg;
717         int offset = offset_in_page(gpa);
718         int ret;
719
720         while ((seg = next_segment(len, offset)) != 0) {
721                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
722                 if (ret < 0)
723                         return ret;
724                 offset = 0;
725                 len -= seg;
726                 data += seg;
727                 ++gfn;
728         }
729         return 0;
730 }
731 EXPORT_SYMBOL_GPL(kvm_read_guest);
732
733 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
734                           unsigned long len)
735 {
736         int r;
737         unsigned long addr;
738         gfn_t gfn = gpa >> PAGE_SHIFT;
739         int offset = offset_in_page(gpa);
740
741         addr = gfn_to_hva(kvm, gfn);
742         if (kvm_is_error_hva(addr))
743                 return -EFAULT;
744         pagefault_disable();
745         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
746         pagefault_enable();
747         if (r)
748                 return -EFAULT;
749         return 0;
750 }
751 EXPORT_SYMBOL(kvm_read_guest_atomic);
752
753 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
754                          int offset, int len)
755 {
756         int r;
757         unsigned long addr;
758
759         addr = gfn_to_hva(kvm, gfn);
760         if (kvm_is_error_hva(addr))
761                 return -EFAULT;
762         r = copy_to_user((void __user *)addr + offset, data, len);
763         if (r)
764                 return -EFAULT;
765         mark_page_dirty(kvm, gfn);
766         return 0;
767 }
768 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
769
770 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
771                     unsigned long len)
772 {
773         gfn_t gfn = gpa >> PAGE_SHIFT;
774         int seg;
775         int offset = offset_in_page(gpa);
776         int ret;
777
778         while ((seg = next_segment(len, offset)) != 0) {
779                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
780                 if (ret < 0)
781                         return ret;
782                 offset = 0;
783                 len -= seg;
784                 data += seg;
785                 ++gfn;
786         }
787         return 0;
788 }
789
790 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
791 {
792         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
793 }
794 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
795
796 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
797 {
798         gfn_t gfn = gpa >> PAGE_SHIFT;
799         int seg;
800         int offset = offset_in_page(gpa);
801         int ret;
802
803         while ((seg = next_segment(len, offset)) != 0) {
804                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
805                 if (ret < 0)
806                         return ret;
807                 offset = 0;
808                 len -= seg;
809                 ++gfn;
810         }
811         return 0;
812 }
813 EXPORT_SYMBOL_GPL(kvm_clear_guest);
814
815 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
816 {
817         struct kvm_memory_slot *memslot;
818
819         gfn = unalias_gfn(kvm, gfn);
820         memslot = __gfn_to_memslot(kvm, gfn);
821         if (memslot && memslot->dirty_bitmap) {
822                 unsigned long rel_gfn = gfn - memslot->base_gfn;
823
824                 /* avoid RMW */
825                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
826                         set_bit(rel_gfn, memslot->dirty_bitmap);
827         }
828 }
829
830 /*
831  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
832  */
833 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
834 {
835         DEFINE_WAIT(wait);
836
837         for (;;) {
838                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
839
840                 if (kvm_cpu_has_interrupt(vcpu))
841                         break;
842                 if (kvm_cpu_has_pending_timer(vcpu))
843                         break;
844                 if (kvm_arch_vcpu_runnable(vcpu))
845                         break;
846                 if (signal_pending(current))
847                         break;
848
849                 vcpu_put(vcpu);
850                 schedule();
851                 vcpu_load(vcpu);
852         }
853
854         finish_wait(&vcpu->wq, &wait);
855 }
856
857 void kvm_resched(struct kvm_vcpu *vcpu)
858 {
859         if (!need_resched())
860                 return;
861         cond_resched();
862 }
863 EXPORT_SYMBOL_GPL(kvm_resched);
864
865 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
866 {
867         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
868         struct page *page;
869
870         if (vmf->pgoff == 0)
871                 page = virt_to_page(vcpu->run);
872 #ifdef CONFIG_X86
873         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
874                 page = virt_to_page(vcpu->arch.pio_data);
875 #endif
876 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
877         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
878                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
879 #endif
880         else
881                 return VM_FAULT_SIGBUS;
882         get_page(page);
883         vmf->page = page;
884         return 0;
885 }
886
887 static struct vm_operations_struct kvm_vcpu_vm_ops = {
888         .fault = kvm_vcpu_fault,
889 };
890
891 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
892 {
893         vma->vm_ops = &kvm_vcpu_vm_ops;
894         return 0;
895 }
896
897 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
898 {
899         struct kvm_vcpu *vcpu = filp->private_data;
900
901         kvm_put_kvm(vcpu->kvm);
902         return 0;
903 }
904
905 static const struct file_operations kvm_vcpu_fops = {
906         .release        = kvm_vcpu_release,
907         .unlocked_ioctl = kvm_vcpu_ioctl,
908         .compat_ioctl   = kvm_vcpu_ioctl,
909         .mmap           = kvm_vcpu_mmap,
910 };
911
912 /*
913  * Allocates an inode for the vcpu.
914  */
915 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
916 {
917         int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
918         if (fd < 0)
919                 kvm_put_kvm(vcpu->kvm);
920         return fd;
921 }
922
923 /*
924  * Creates some virtual cpus.  Good luck creating more than one.
925  */
926 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
927 {
928         int r;
929         struct kvm_vcpu *vcpu;
930
931         if (!valid_vcpu(n))
932                 return -EINVAL;
933
934         vcpu = kvm_arch_vcpu_create(kvm, n);
935         if (IS_ERR(vcpu))
936                 return PTR_ERR(vcpu);
937
938         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
939
940         r = kvm_arch_vcpu_setup(vcpu);
941         if (r)
942                 goto vcpu_destroy;
943
944         mutex_lock(&kvm->lock);
945         if (kvm->vcpus[n]) {
946                 r = -EEXIST;
947                 mutex_unlock(&kvm->lock);
948                 goto vcpu_destroy;
949         }
950         kvm->vcpus[n] = vcpu;
951         mutex_unlock(&kvm->lock);
952
953         /* Now it's all set up, let userspace reach it */
954         kvm_get_kvm(kvm);
955         r = create_vcpu_fd(vcpu);
956         if (r < 0)
957                 goto unlink;
958         return r;
959
960 unlink:
961         mutex_lock(&kvm->lock);
962         kvm->vcpus[n] = NULL;
963         mutex_unlock(&kvm->lock);
964 vcpu_destroy:
965         kvm_arch_vcpu_destroy(vcpu);
966         return r;
967 }
968
969 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
970 {
971         if (sigset) {
972                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
973                 vcpu->sigset_active = 1;
974                 vcpu->sigset = *sigset;
975         } else
976                 vcpu->sigset_active = 0;
977         return 0;
978 }
979
980 static long kvm_vcpu_ioctl(struct file *filp,
981                            unsigned int ioctl, unsigned long arg)
982 {
983         struct kvm_vcpu *vcpu = filp->private_data;
984         void __user *argp = (void __user *)arg;
985         int r;
986
987         if (vcpu->kvm->mm != current->mm)
988                 return -EIO;
989         switch (ioctl) {
990         case KVM_RUN:
991                 r = -EINVAL;
992                 if (arg)
993                         goto out;
994                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
995                 break;
996         case KVM_GET_REGS: {
997                 struct kvm_regs *kvm_regs;
998
999                 r = -ENOMEM;
1000                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1001                 if (!kvm_regs)
1002                         goto out;
1003                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1004                 if (r)
1005                         goto out_free1;
1006                 r = -EFAULT;
1007                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1008                         goto out_free1;
1009                 r = 0;
1010 out_free1:
1011                 kfree(kvm_regs);
1012                 break;
1013         }
1014         case KVM_SET_REGS: {
1015                 struct kvm_regs *kvm_regs;
1016
1017                 r = -ENOMEM;
1018                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1019                 if (!kvm_regs)
1020                         goto out;
1021                 r = -EFAULT;
1022                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1023                         goto out_free2;
1024                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1025                 if (r)
1026                         goto out_free2;
1027                 r = 0;
1028 out_free2:
1029                 kfree(kvm_regs);
1030                 break;
1031         }
1032         case KVM_GET_SREGS: {
1033                 struct kvm_sregs kvm_sregs;
1034
1035                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
1036                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
1037                 if (r)
1038                         goto out;
1039                 r = -EFAULT;
1040                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
1041                         goto out;
1042                 r = 0;
1043                 break;
1044         }
1045         case KVM_SET_SREGS: {
1046                 struct kvm_sregs kvm_sregs;
1047
1048                 r = -EFAULT;
1049                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1050                         goto out;
1051                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
1052                 if (r)
1053                         goto out;
1054                 r = 0;
1055                 break;
1056         }
1057         case KVM_GET_MP_STATE: {
1058                 struct kvm_mp_state mp_state;
1059
1060                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1061                 if (r)
1062                         goto out;
1063                 r = -EFAULT;
1064                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1065                         goto out;
1066                 r = 0;
1067                 break;
1068         }
1069         case KVM_SET_MP_STATE: {
1070                 struct kvm_mp_state mp_state;
1071
1072                 r = -EFAULT;
1073                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1074                         goto out;
1075                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1076                 if (r)
1077                         goto out;
1078                 r = 0;
1079                 break;
1080         }
1081         case KVM_TRANSLATE: {
1082                 struct kvm_translation tr;
1083
1084                 r = -EFAULT;
1085                 if (copy_from_user(&tr, argp, sizeof tr))
1086                         goto out;
1087                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1088                 if (r)
1089                         goto out;
1090                 r = -EFAULT;
1091                 if (copy_to_user(argp, &tr, sizeof tr))
1092                         goto out;
1093                 r = 0;
1094                 break;
1095         }
1096         case KVM_DEBUG_GUEST: {
1097                 struct kvm_debug_guest dbg;
1098
1099                 r = -EFAULT;
1100                 if (copy_from_user(&dbg, argp, sizeof dbg))
1101                         goto out;
1102                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
1103                 if (r)
1104                         goto out;
1105                 r = 0;
1106                 break;
1107         }
1108         case KVM_SET_SIGNAL_MASK: {
1109                 struct kvm_signal_mask __user *sigmask_arg = argp;
1110                 struct kvm_signal_mask kvm_sigmask;
1111                 sigset_t sigset, *p;
1112
1113                 p = NULL;
1114                 if (argp) {
1115                         r = -EFAULT;
1116                         if (copy_from_user(&kvm_sigmask, argp,
1117                                            sizeof kvm_sigmask))
1118                                 goto out;
1119                         r = -EINVAL;
1120                         if (kvm_sigmask.len != sizeof sigset)
1121                                 goto out;
1122                         r = -EFAULT;
1123                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1124                                            sizeof sigset))
1125                                 goto out;
1126                         p = &sigset;
1127                 }
1128                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1129                 break;
1130         }
1131         case KVM_GET_FPU: {
1132                 struct kvm_fpu fpu;
1133
1134                 memset(&fpu, 0, sizeof fpu);
1135                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
1136                 if (r)
1137                         goto out;
1138                 r = -EFAULT;
1139                 if (copy_to_user(argp, &fpu, sizeof fpu))
1140                         goto out;
1141                 r = 0;
1142                 break;
1143         }
1144         case KVM_SET_FPU: {
1145                 struct kvm_fpu fpu;
1146
1147                 r = -EFAULT;
1148                 if (copy_from_user(&fpu, argp, sizeof fpu))
1149                         goto out;
1150                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
1151                 if (r)
1152                         goto out;
1153                 r = 0;
1154                 break;
1155         }
1156         default:
1157                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1158         }
1159 out:
1160         return r;
1161 }
1162
1163 static long kvm_vm_ioctl(struct file *filp,
1164                            unsigned int ioctl, unsigned long arg)
1165 {
1166         struct kvm *kvm = filp->private_data;
1167         void __user *argp = (void __user *)arg;
1168         int r;
1169
1170         if (kvm->mm != current->mm)
1171                 return -EIO;
1172         switch (ioctl) {
1173         case KVM_CREATE_VCPU:
1174                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1175                 if (r < 0)
1176                         goto out;
1177                 break;
1178         case KVM_SET_USER_MEMORY_REGION: {
1179                 struct kvm_userspace_memory_region kvm_userspace_mem;
1180
1181                 r = -EFAULT;
1182                 if (copy_from_user(&kvm_userspace_mem, argp,
1183                                                 sizeof kvm_userspace_mem))
1184                         goto out;
1185
1186                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1187                 if (r)
1188                         goto out;
1189                 break;
1190         }
1191         case KVM_GET_DIRTY_LOG: {
1192                 struct kvm_dirty_log log;
1193
1194                 r = -EFAULT;
1195                 if (copy_from_user(&log, argp, sizeof log))
1196                         goto out;
1197                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1198                 if (r)
1199                         goto out;
1200                 break;
1201         }
1202 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1203         case KVM_REGISTER_COALESCED_MMIO: {
1204                 struct kvm_coalesced_mmio_zone zone;
1205                 r = -EFAULT;
1206                 if (copy_from_user(&zone, argp, sizeof zone))
1207                         goto out;
1208                 r = -ENXIO;
1209                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1210                 if (r)
1211                         goto out;
1212                 r = 0;
1213                 break;
1214         }
1215         case KVM_UNREGISTER_COALESCED_MMIO: {
1216                 struct kvm_coalesced_mmio_zone zone;
1217                 r = -EFAULT;
1218                 if (copy_from_user(&zone, argp, sizeof zone))
1219                         goto out;
1220                 r = -ENXIO;
1221                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1222                 if (r)
1223                         goto out;
1224                 r = 0;
1225                 break;
1226         }
1227 #endif
1228         default:
1229                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1230         }
1231 out:
1232         return r;
1233 }
1234
1235 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1236 {
1237         struct kvm *kvm = vma->vm_file->private_data;
1238         struct page *page;
1239
1240         if (!kvm_is_visible_gfn(kvm, vmf->pgoff))
1241                 return VM_FAULT_SIGBUS;
1242         page = gfn_to_page(kvm, vmf->pgoff);
1243         if (is_error_page(page)) {
1244                 kvm_release_page_clean(page);
1245                 return VM_FAULT_SIGBUS;
1246         }
1247         vmf->page = page;
1248         return 0;
1249 }
1250
1251 static struct vm_operations_struct kvm_vm_vm_ops = {
1252         .fault = kvm_vm_fault,
1253 };
1254
1255 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1256 {
1257         vma->vm_ops = &kvm_vm_vm_ops;
1258         return 0;
1259 }
1260
1261 static const struct file_operations kvm_vm_fops = {
1262         .release        = kvm_vm_release,
1263         .unlocked_ioctl = kvm_vm_ioctl,
1264         .compat_ioctl   = kvm_vm_ioctl,
1265         .mmap           = kvm_vm_mmap,
1266 };
1267
1268 static int kvm_dev_ioctl_create_vm(void)
1269 {
1270         int fd;
1271         struct kvm *kvm;
1272
1273         kvm = kvm_create_vm();
1274         if (IS_ERR(kvm))
1275                 return PTR_ERR(kvm);
1276         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1277         if (fd < 0)
1278                 kvm_put_kvm(kvm);
1279
1280         return fd;
1281 }
1282
1283 static long kvm_dev_ioctl(struct file *filp,
1284                           unsigned int ioctl, unsigned long arg)
1285 {
1286         long r = -EINVAL;
1287
1288         switch (ioctl) {
1289         case KVM_GET_API_VERSION:
1290                 r = -EINVAL;
1291                 if (arg)
1292                         goto out;
1293                 r = KVM_API_VERSION;
1294                 break;
1295         case KVM_CREATE_VM:
1296                 r = -EINVAL;
1297                 if (arg)
1298                         goto out;
1299                 r = kvm_dev_ioctl_create_vm();
1300                 break;
1301         case KVM_CHECK_EXTENSION:
1302                 r = kvm_dev_ioctl_check_extension(arg);
1303                 break;
1304         case KVM_GET_VCPU_MMAP_SIZE:
1305                 r = -EINVAL;
1306                 if (arg)
1307                         goto out;
1308                 r = PAGE_SIZE;     /* struct kvm_run */
1309 #ifdef CONFIG_X86
1310                 r += PAGE_SIZE;    /* pio data page */
1311 #endif
1312 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1313                 r += PAGE_SIZE;    /* coalesced mmio ring page */
1314 #endif
1315                 break;
1316         case KVM_TRACE_ENABLE:
1317         case KVM_TRACE_PAUSE:
1318         case KVM_TRACE_DISABLE:
1319                 r = kvm_trace_ioctl(ioctl, arg);
1320                 break;
1321         default:
1322                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1323         }
1324 out:
1325         return r;
1326 }
1327
1328 static struct file_operations kvm_chardev_ops = {
1329         .unlocked_ioctl = kvm_dev_ioctl,
1330         .compat_ioctl   = kvm_dev_ioctl,
1331 };
1332
1333 static struct miscdevice kvm_dev = {
1334         KVM_MINOR,
1335         "kvm",
1336         &kvm_chardev_ops,
1337 };
1338
1339 static void hardware_enable(void *junk)
1340 {
1341         int cpu = raw_smp_processor_id();
1342
1343         if (cpu_isset(cpu, cpus_hardware_enabled))
1344                 return;
1345         cpu_set(cpu, cpus_hardware_enabled);
1346         kvm_arch_hardware_enable(NULL);
1347 }
1348
1349 static void hardware_disable(void *junk)
1350 {
1351         int cpu = raw_smp_processor_id();
1352
1353         if (!cpu_isset(cpu, cpus_hardware_enabled))
1354                 return;
1355         cpu_clear(cpu, cpus_hardware_enabled);
1356         kvm_arch_hardware_disable(NULL);
1357 }
1358
1359 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1360                            void *v)
1361 {
1362         int cpu = (long)v;
1363
1364         val &= ~CPU_TASKS_FROZEN;
1365         switch (val) {
1366         case CPU_DYING:
1367                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1368                        cpu);
1369                 hardware_disable(NULL);
1370                 break;
1371         case CPU_UP_CANCELED:
1372                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1373                        cpu);
1374                 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1375                 break;
1376         case CPU_ONLINE:
1377                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1378                        cpu);
1379                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1380                 break;
1381         }
1382         return NOTIFY_OK;
1383 }
1384
1385
1386 asmlinkage void kvm_handle_fault_on_reboot(void)
1387 {
1388         if (kvm_rebooting)
1389                 /* spin while reset goes on */
1390                 while (true)
1391                         ;
1392         /* Fault while not rebooting.  We want the trace. */
1393         BUG();
1394 }
1395 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1396
1397 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1398                       void *v)
1399 {
1400         if (val == SYS_RESTART) {
1401                 /*
1402                  * Some (well, at least mine) BIOSes hang on reboot if
1403                  * in vmx root mode.
1404                  */
1405                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1406                 kvm_rebooting = true;
1407                 on_each_cpu(hardware_disable, NULL, 1);
1408         }
1409         return NOTIFY_OK;
1410 }
1411
1412 static struct notifier_block kvm_reboot_notifier = {
1413         .notifier_call = kvm_reboot,
1414         .priority = 0,
1415 };
1416
1417 void kvm_io_bus_init(struct kvm_io_bus *bus)
1418 {
1419         memset(bus, 0, sizeof(*bus));
1420 }
1421
1422 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1423 {
1424         int i;
1425
1426         for (i = 0; i < bus->dev_count; i++) {
1427                 struct kvm_io_device *pos = bus->devs[i];
1428
1429                 kvm_iodevice_destructor(pos);
1430         }
1431 }
1432
1433 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
1434                                           gpa_t addr, int len, int is_write)
1435 {
1436         int i;
1437
1438         for (i = 0; i < bus->dev_count; i++) {
1439                 struct kvm_io_device *pos = bus->devs[i];
1440
1441                 if (pos->in_range(pos, addr, len, is_write))
1442                         return pos;
1443         }
1444
1445         return NULL;
1446 }
1447
1448 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1449 {
1450         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1451
1452         bus->devs[bus->dev_count++] = dev;
1453 }
1454
1455 static struct notifier_block kvm_cpu_notifier = {
1456         .notifier_call = kvm_cpu_hotplug,
1457         .priority = 20, /* must be > scheduler priority */
1458 };
1459
1460 static int vm_stat_get(void *_offset, u64 *val)
1461 {
1462         unsigned offset = (long)_offset;
1463         struct kvm *kvm;
1464
1465         *val = 0;
1466         spin_lock(&kvm_lock);
1467         list_for_each_entry(kvm, &vm_list, vm_list)
1468                 *val += *(u32 *)((void *)kvm + offset);
1469         spin_unlock(&kvm_lock);
1470         return 0;
1471 }
1472
1473 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1474
1475 static int vcpu_stat_get(void *_offset, u64 *val)
1476 {
1477         unsigned offset = (long)_offset;
1478         struct kvm *kvm;
1479         struct kvm_vcpu *vcpu;
1480         int i;
1481
1482         *val = 0;
1483         spin_lock(&kvm_lock);
1484         list_for_each_entry(kvm, &vm_list, vm_list)
1485                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1486                         vcpu = kvm->vcpus[i];
1487                         if (vcpu)
1488                                 *val += *(u32 *)((void *)vcpu + offset);
1489                 }
1490         spin_unlock(&kvm_lock);
1491         return 0;
1492 }
1493
1494 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1495
1496 static struct file_operations *stat_fops[] = {
1497         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1498         [KVM_STAT_VM]   = &vm_stat_fops,
1499 };
1500
1501 static void kvm_init_debug(void)
1502 {
1503         struct kvm_stats_debugfs_item *p;
1504
1505         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
1506         for (p = debugfs_entries; p->name; ++p)
1507                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
1508                                                 (void *)(long)p->offset,
1509                                                 stat_fops[p->kind]);
1510 }
1511
1512 static void kvm_exit_debug(void)
1513 {
1514         struct kvm_stats_debugfs_item *p;
1515
1516         for (p = debugfs_entries; p->name; ++p)
1517                 debugfs_remove(p->dentry);
1518         debugfs_remove(kvm_debugfs_dir);
1519 }
1520
1521 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1522 {
1523         hardware_disable(NULL);
1524         return 0;
1525 }
1526
1527 static int kvm_resume(struct sys_device *dev)
1528 {
1529         hardware_enable(NULL);
1530         return 0;
1531 }
1532
1533 static struct sysdev_class kvm_sysdev_class = {
1534         .name = "kvm",
1535         .suspend = kvm_suspend,
1536         .resume = kvm_resume,
1537 };
1538
1539 static struct sys_device kvm_sysdev = {
1540         .id = 0,
1541         .cls = &kvm_sysdev_class,
1542 };
1543
1544 struct page *bad_page;
1545 pfn_t bad_pfn;
1546
1547 static inline
1548 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1549 {
1550         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1551 }
1552
1553 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1554 {
1555         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1556
1557         kvm_arch_vcpu_load(vcpu, cpu);
1558 }
1559
1560 static void kvm_sched_out(struct preempt_notifier *pn,
1561                           struct task_struct *next)
1562 {
1563         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1564
1565         kvm_arch_vcpu_put(vcpu);
1566 }
1567
1568 int kvm_init(void *opaque, unsigned int vcpu_size,
1569                   struct module *module)
1570 {
1571         int r;
1572         int cpu;
1573
1574         kvm_init_debug();
1575
1576         r = kvm_arch_init(opaque);
1577         if (r)
1578                 goto out_fail;
1579
1580         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1581
1582         if (bad_page == NULL) {
1583                 r = -ENOMEM;
1584                 goto out;
1585         }
1586
1587         bad_pfn = page_to_pfn(bad_page);
1588
1589         r = kvm_arch_hardware_setup();
1590         if (r < 0)
1591                 goto out_free_0;
1592
1593         for_each_online_cpu(cpu) {
1594                 smp_call_function_single(cpu,
1595                                 kvm_arch_check_processor_compat,
1596                                 &r, 1);
1597                 if (r < 0)
1598                         goto out_free_1;
1599         }
1600
1601         on_each_cpu(hardware_enable, NULL, 1);
1602         r = register_cpu_notifier(&kvm_cpu_notifier);
1603         if (r)
1604                 goto out_free_2;
1605         register_reboot_notifier(&kvm_reboot_notifier);
1606
1607         r = sysdev_class_register(&kvm_sysdev_class);
1608         if (r)
1609                 goto out_free_3;
1610
1611         r = sysdev_register(&kvm_sysdev);
1612         if (r)
1613                 goto out_free_4;
1614
1615         /* A kmem cache lets us meet the alignment requirements of fx_save. */
1616         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1617                                            __alignof__(struct kvm_vcpu),
1618                                            0, NULL);
1619         if (!kvm_vcpu_cache) {
1620                 r = -ENOMEM;
1621                 goto out_free_5;
1622         }
1623
1624         kvm_chardev_ops.owner = module;
1625
1626         r = misc_register(&kvm_dev);
1627         if (r) {
1628                 printk(KERN_ERR "kvm: misc device register failed\n");
1629                 goto out_free;
1630         }
1631
1632         kvm_preempt_ops.sched_in = kvm_sched_in;
1633         kvm_preempt_ops.sched_out = kvm_sched_out;
1634
1635         return 0;
1636
1637 out_free:
1638         kmem_cache_destroy(kvm_vcpu_cache);
1639 out_free_5:
1640         sysdev_unregister(&kvm_sysdev);
1641 out_free_4:
1642         sysdev_class_unregister(&kvm_sysdev_class);
1643 out_free_3:
1644         unregister_reboot_notifier(&kvm_reboot_notifier);
1645         unregister_cpu_notifier(&kvm_cpu_notifier);
1646 out_free_2:
1647         on_each_cpu(hardware_disable, NULL, 1);
1648 out_free_1:
1649         kvm_arch_hardware_unsetup();
1650 out_free_0:
1651         __free_page(bad_page);
1652 out:
1653         kvm_arch_exit();
1654         kvm_exit_debug();
1655 out_fail:
1656         return r;
1657 }
1658 EXPORT_SYMBOL_GPL(kvm_init);
1659
1660 void kvm_exit(void)
1661 {
1662         kvm_trace_cleanup();
1663         misc_deregister(&kvm_dev);
1664         kmem_cache_destroy(kvm_vcpu_cache);
1665         sysdev_unregister(&kvm_sysdev);
1666         sysdev_class_unregister(&kvm_sysdev_class);
1667         unregister_reboot_notifier(&kvm_reboot_notifier);
1668         unregister_cpu_notifier(&kvm_cpu_notifier);
1669         on_each_cpu(hardware_disable, NULL, 1);
1670         kvm_arch_hardware_unsetup();
1671         kvm_arch_exit();
1672         kvm_exit_debug();
1673         __free_page(bad_page);
1674 }
1675 EXPORT_SYMBOL_GPL(kvm_exit);