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V4L/DVB: cpia_usb: remove unneeded variable
[wandboard.git] / virt / kvm / kvm_main.c
blobf032806a212f9d8e02faa7823f65262813d82015
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/mm.h>
26 #include <linux/miscdevice.h>
27 #include <linux/vmalloc.h>
28 #include <linux/reboot.h>
29 #include <linux/debugfs.h>
30 #include <linux/highmem.h>
31 #include <linux/file.h>
32 #include <linux/sysdev.h>
33 #include <linux/cpu.h>
34 #include <linux/sched.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
49
50 #include <asm/processor.h>
51 #include <asm/io.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm-generic/bitops/le.h>
55
56 #include "coalesced_mmio.h"
57
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/kvm.h>
60
61 MODULE_AUTHOR("Qumranet");
62 MODULE_LICENSE("GPL");
63
64 /*
65 * Ordering of locks:
66 *
67 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
68 */
69
70 DEFINE_SPINLOCK(kvm_lock);
71 LIST_HEAD(vm_list);
72
73 static cpumask_var_t cpus_hardware_enabled;
74 static int kvm_usage_count = 0;
75 static atomic_t hardware_enable_failed;
76
77 struct kmem_cache *kvm_vcpu_cache;
78 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
79
80 static __read_mostly struct preempt_ops kvm_preempt_ops;
81
82 struct dentry *kvm_debugfs_dir;
83
84 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
85 unsigned long arg);
86 static int hardware_enable_all(void);
87 static void hardware_disable_all(void);
88
89 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
90
91 static bool kvm_rebooting;
92
93 static bool largepages_enabled = true;
94
95 inline int kvm_is_mmio_pfn(pfn_t pfn)
96 {
97 if (pfn_valid(pfn)) {
98 struct page *page = compound_head(pfn_to_page(pfn));
99 return PageReserved(page);
100 }
101
102 return true;
103 }
104
105 /*
106 * Switches to specified vcpu, until a matching vcpu_put()
107 */
108 void vcpu_load(struct kvm_vcpu *vcpu)
109 {
110 int cpu;
111
112 mutex_lock(&vcpu->mutex);
113 cpu = get_cpu();
114 preempt_notifier_register(&vcpu->preempt_notifier);
115 kvm_arch_vcpu_load(vcpu, cpu);
116 put_cpu();
117 }
118
119 void vcpu_put(struct kvm_vcpu *vcpu)
120 {
121 preempt_disable();
122 kvm_arch_vcpu_put(vcpu);
123 preempt_notifier_unregister(&vcpu->preempt_notifier);
124 preempt_enable();
125 mutex_unlock(&vcpu->mutex);
126 }
127
128 static void ack_flush(void *_completed)
129 {
130 }
131
132 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
133 {
134 int i, cpu, me;
135 cpumask_var_t cpus;
136 bool called = true;
137 struct kvm_vcpu *vcpu;
138
139 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
140
141 raw_spin_lock(&kvm->requests_lock);
142 me = smp_processor_id();
143 kvm_for_each_vcpu(i, vcpu, kvm) {
144 if (test_and_set_bit(req, &vcpu->requests))
145 continue;
146 cpu = vcpu->cpu;
147 if (cpus != NULL && cpu != -1 && cpu != me)
148 cpumask_set_cpu(cpu, cpus);
149 }
150 if (unlikely(cpus == NULL))
151 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
152 else if (!cpumask_empty(cpus))
153 smp_call_function_many(cpus, ack_flush, NULL, 1);
154 else
155 called = false;
156 raw_spin_unlock(&kvm->requests_lock);
157 free_cpumask_var(cpus);
158 return called;
159 }
160
161 void kvm_flush_remote_tlbs(struct kvm *kvm)
162 {
163 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
164 ++kvm->stat.remote_tlb_flush;
165 }
166
167 void kvm_reload_remote_mmus(struct kvm *kvm)
168 {
169 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
170 }
171
172 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
173 {
174 struct page *page;
175 int r;
176
177 mutex_init(&vcpu->mutex);
178 vcpu->cpu = -1;
179 vcpu->kvm = kvm;
180 vcpu->vcpu_id = id;
181 init_waitqueue_head(&vcpu->wq);
182
183 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
184 if (!page) {
185 r = -ENOMEM;
186 goto fail;
187 }
188 vcpu->run = page_address(page);
189
190 r = kvm_arch_vcpu_init(vcpu);
191 if (r < 0)
192 goto fail_free_run;
193 return 0;
194
195 fail_free_run:
196 free_page((unsigned long)vcpu->run);
197 fail:
198 return r;
199 }
200 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
201
202 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
203 {
204 kvm_arch_vcpu_uninit(vcpu);
205 free_page((unsigned long)vcpu->run);
206 }
207 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
208
209 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
210 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
211 {
212 return container_of(mn, struct kvm, mmu_notifier);
213 }
214
215 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
216 struct mm_struct *mm,
217 unsigned long address)
218 {
219 struct kvm *kvm = mmu_notifier_to_kvm(mn);
220 int need_tlb_flush, idx;
221
222 /*
223 * When ->invalidate_page runs, the linux pte has been zapped
224 * already but the page is still allocated until
225 * ->invalidate_page returns. So if we increase the sequence
226 * here the kvm page fault will notice if the spte can't be
227 * established because the page is going to be freed. If
228 * instead the kvm page fault establishes the spte before
229 * ->invalidate_page runs, kvm_unmap_hva will release it
230 * before returning.
231 *
232 * The sequence increase only need to be seen at spin_unlock
233 * time, and not at spin_lock time.
234 *
235 * Increasing the sequence after the spin_unlock would be
236 * unsafe because the kvm page fault could then establish the
237 * pte after kvm_unmap_hva returned, without noticing the page
238 * is going to be freed.
239 */
240 idx = srcu_read_lock(&kvm->srcu);
241 spin_lock(&kvm->mmu_lock);
242 kvm->mmu_notifier_seq++;
243 need_tlb_flush = kvm_unmap_hva(kvm, address);
244 spin_unlock(&kvm->mmu_lock);
245 srcu_read_unlock(&kvm->srcu, idx);
246
247 /* we've to flush the tlb before the pages can be freed */
248 if (need_tlb_flush)
249 kvm_flush_remote_tlbs(kvm);
250
251 }
252
253 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
254 struct mm_struct *mm,
255 unsigned long address,
256 pte_t pte)
257 {
258 struct kvm *kvm = mmu_notifier_to_kvm(mn);
259 int idx;
260
261 idx = srcu_read_lock(&kvm->srcu);
262 spin_lock(&kvm->mmu_lock);
263 kvm->mmu_notifier_seq++;
264 kvm_set_spte_hva(kvm, address, pte);
265 spin_unlock(&kvm->mmu_lock);
266 srcu_read_unlock(&kvm->srcu, idx);
267 }
268
269 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
270 struct mm_struct *mm,
271 unsigned long start,
272 unsigned long end)
273 {
274 struct kvm *kvm = mmu_notifier_to_kvm(mn);
275 int need_tlb_flush = 0, idx;
276
277 idx = srcu_read_lock(&kvm->srcu);
278 spin_lock(&kvm->mmu_lock);
279 /*
280 * The count increase must become visible at unlock time as no
281 * spte can be established without taking the mmu_lock and
282 * count is also read inside the mmu_lock critical section.
283 */
284 kvm->mmu_notifier_count++;
285 for (; start < end; start += PAGE_SIZE)
286 need_tlb_flush |= kvm_unmap_hva(kvm, start);
287 spin_unlock(&kvm->mmu_lock);
288 srcu_read_unlock(&kvm->srcu, idx);
289
290 /* we've to flush the tlb before the pages can be freed */
291 if (need_tlb_flush)
292 kvm_flush_remote_tlbs(kvm);
293 }
294
295 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
296 struct mm_struct *mm,
297 unsigned long start,
298 unsigned long end)
299 {
300 struct kvm *kvm = mmu_notifier_to_kvm(mn);
301
302 spin_lock(&kvm->mmu_lock);
303 /*
304 * This sequence increase will notify the kvm page fault that
305 * the page that is going to be mapped in the spte could have
306 * been freed.
307 */
308 kvm->mmu_notifier_seq++;
309 /*
310 * The above sequence increase must be visible before the
311 * below count decrease but both values are read by the kvm
312 * page fault under mmu_lock spinlock so we don't need to add
313 * a smb_wmb() here in between the two.
314 */
315 kvm->mmu_notifier_count--;
316 spin_unlock(&kvm->mmu_lock);
317
318 BUG_ON(kvm->mmu_notifier_count < 0);
319 }
320
321 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
322 struct mm_struct *mm,
323 unsigned long address)
324 {
325 struct kvm *kvm = mmu_notifier_to_kvm(mn);
326 int young, idx;
327
328 idx = srcu_read_lock(&kvm->srcu);
329 spin_lock(&kvm->mmu_lock);
330 young = kvm_age_hva(kvm, address);
331 spin_unlock(&kvm->mmu_lock);
332 srcu_read_unlock(&kvm->srcu, idx);
333
334 if (young)
335 kvm_flush_remote_tlbs(kvm);
336
337 return young;
338 }
339
340 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
341 struct mm_struct *mm)
342 {
343 struct kvm *kvm = mmu_notifier_to_kvm(mn);
344 int idx;
345
346 idx = srcu_read_lock(&kvm->srcu);
347 kvm_arch_flush_shadow(kvm);
348 srcu_read_unlock(&kvm->srcu, idx);
349 }
350
351 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
352 .invalidate_page = kvm_mmu_notifier_invalidate_page,
353 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
354 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
355 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
356 .change_pte = kvm_mmu_notifier_change_pte,
357 .release = kvm_mmu_notifier_release,
358 };
359
360 static int kvm_init_mmu_notifier(struct kvm *kvm)
361 {
362 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
363 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
364 }
365
366 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
367
368 static int kvm_init_mmu_notifier(struct kvm *kvm)
369 {
370 return 0;
371 }
372
373 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
374
375 static struct kvm *kvm_create_vm(void)
376 {
377 int r = 0, i;
378 struct kvm *kvm = kvm_arch_create_vm();
379
380 if (IS_ERR(kvm))
381 goto out;
382
383 r = hardware_enable_all();
384 if (r)
385 goto out_err_nodisable;
386
387 #ifdef CONFIG_HAVE_KVM_IRQCHIP
388 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
389 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
390 #endif
391
392 r = -ENOMEM;
393 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
394 if (!kvm->memslots)
395 goto out_err;
396 if (init_srcu_struct(&kvm->srcu))
397 goto out_err;
398 for (i = 0; i < KVM_NR_BUSES; i++) {
399 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
400 GFP_KERNEL);
401 if (!kvm->buses[i]) {
402 cleanup_srcu_struct(&kvm->srcu);
403 goto out_err;
404 }
405 }
406
407 r = kvm_init_mmu_notifier(kvm);
408 if (r) {
409 cleanup_srcu_struct(&kvm->srcu);
410 goto out_err;
411 }
412
413 kvm->mm = current->mm;
414 atomic_inc(&kvm->mm->mm_count);
415 spin_lock_init(&kvm->mmu_lock);
416 raw_spin_lock_init(&kvm->requests_lock);
417 kvm_eventfd_init(kvm);
418 mutex_init(&kvm->lock);
419 mutex_init(&kvm->irq_lock);
420 mutex_init(&kvm->slots_lock);
421 atomic_set(&kvm->users_count, 1);
422 spin_lock(&kvm_lock);
423 list_add(&kvm->vm_list, &vm_list);
424 spin_unlock(&kvm_lock);
425 out:
426 return kvm;
427
428 out_err:
429 hardware_disable_all();
430 out_err_nodisable:
431 for (i = 0; i < KVM_NR_BUSES; i++)
432 kfree(kvm->buses[i]);
433 kfree(kvm->memslots);
434 kfree(kvm);
435 return ERR_PTR(r);
436 }
437
438 /*
439 * Free any memory in @free but not in @dont.
440 */
441 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
442 struct kvm_memory_slot *dont)
443 {
444 int i;
445
446 if (!dont || free->rmap != dont->rmap)
447 vfree(free->rmap);
448
449 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
450 vfree(free->dirty_bitmap);
451
452
453 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
454 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
455 vfree(free->lpage_info[i]);
456 free->lpage_info[i] = NULL;
457 }
458 }
459
460 free->npages = 0;
461 free->dirty_bitmap = NULL;
462 free->rmap = NULL;
463 }
464
465 void kvm_free_physmem(struct kvm *kvm)
466 {
467 int i;
468 struct kvm_memslots *slots = kvm->memslots;
469
470 for (i = 0; i < slots->nmemslots; ++i)
471 kvm_free_physmem_slot(&slots->memslots[i], NULL);
472
473 kfree(kvm->memslots);
474 }
475
476 static void kvm_destroy_vm(struct kvm *kvm)
477 {
478 int i;
479 struct mm_struct *mm = kvm->mm;
480
481 kvm_arch_sync_events(kvm);
482 spin_lock(&kvm_lock);
483 list_del(&kvm->vm_list);
484 spin_unlock(&kvm_lock);
485 kvm_free_irq_routing(kvm);
486 for (i = 0; i < KVM_NR_BUSES; i++)
487 kvm_io_bus_destroy(kvm->buses[i]);
488 kvm_coalesced_mmio_free(kvm);
489 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
490 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
491 #else
492 kvm_arch_flush_shadow(kvm);
493 #endif
494 kvm_arch_destroy_vm(kvm);
495 hardware_disable_all();
496 mmdrop(mm);
497 }
498
499 void kvm_get_kvm(struct kvm *kvm)
500 {
501 atomic_inc(&kvm->users_count);
502 }
503 EXPORT_SYMBOL_GPL(kvm_get_kvm);
504
505 void kvm_put_kvm(struct kvm *kvm)
506 {
507 if (atomic_dec_and_test(&kvm->users_count))
508 kvm_destroy_vm(kvm);
509 }
510 EXPORT_SYMBOL_GPL(kvm_put_kvm);
511
512
513 static int kvm_vm_release(struct inode *inode, struct file *filp)
514 {
515 struct kvm *kvm = filp->private_data;
516
517 kvm_irqfd_release(kvm);
518
519 kvm_put_kvm(kvm);
520 return 0;
521 }
522
523 /*
524 * Allocate some memory and give it an address in the guest physical address
525 * space.
526 *
527 * Discontiguous memory is allowed, mostly for framebuffers.
528 *
529 * Must be called holding mmap_sem for write.
530 */
531 int __kvm_set_memory_region(struct kvm *kvm,
532 struct kvm_userspace_memory_region *mem,
533 int user_alloc)
534 {
535 int r, flush_shadow = 0;
536 gfn_t base_gfn;
537 unsigned long npages;
538 unsigned long i;
539 struct kvm_memory_slot *memslot;
540 struct kvm_memory_slot old, new;
541 struct kvm_memslots *slots, *old_memslots;
542
543 r = -EINVAL;
544 /* General sanity checks */
545 if (mem->memory_size & (PAGE_SIZE - 1))
546 goto out;
547 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
548 goto out;
549 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
550 goto out;
551 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
552 goto out;
553 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
554 goto out;
555
556 memslot = &kvm->memslots->memslots[mem->slot];
557 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
558 npages = mem->memory_size >> PAGE_SHIFT;
559
560 r = -EINVAL;
561 if (npages > KVM_MEM_MAX_NR_PAGES)
562 goto out;
563
564 if (!npages)
565 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
566
567 new = old = *memslot;
568
569 new.base_gfn = base_gfn;
570 new.npages = npages;
571 new.flags = mem->flags;
572
573 /* Disallow changing a memory slot's size. */
574 r = -EINVAL;
575 if (npages && old.npages && npages != old.npages)
576 goto out_free;
577
578 /* Check for overlaps */
579 r = -EEXIST;
580 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
581 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
582
583 if (s == memslot || !s->npages)
584 continue;
585 if (!((base_gfn + npages <= s->base_gfn) ||
586 (base_gfn >= s->base_gfn + s->npages)))
587 goto out_free;
588 }
589
590 /* Free page dirty bitmap if unneeded */
591 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
592 new.dirty_bitmap = NULL;
593
594 r = -ENOMEM;
595
596 /* Allocate if a slot is being created */
597 #ifndef CONFIG_S390
598 if (npages && !new.rmap) {
599 new.rmap = vmalloc(npages * sizeof(struct page *));
600
601 if (!new.rmap)
602 goto out_free;
603
604 memset(new.rmap, 0, npages * sizeof(*new.rmap));
605
606 new.user_alloc = user_alloc;
607 new.userspace_addr = mem->userspace_addr;
608 }
609 if (!npages)
610 goto skip_lpage;
611
612 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
613 unsigned long ugfn;
614 unsigned long j;
615 int lpages;
616 int level = i + 2;
617
618 /* Avoid unused variable warning if no large pages */
619 (void)level;
620
621 if (new.lpage_info[i])
622 continue;
623
624 lpages = 1 + (base_gfn + npages - 1) /
625 KVM_PAGES_PER_HPAGE(level);
626 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
627
628 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
629
630 if (!new.lpage_info[i])
631 goto out_free;
632
633 memset(new.lpage_info[i], 0,
634 lpages * sizeof(*new.lpage_info[i]));
635
636 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
637 new.lpage_info[i][0].write_count = 1;
638 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
639 new.lpage_info[i][lpages - 1].write_count = 1;
640 ugfn = new.userspace_addr >> PAGE_SHIFT;
641 /*
642 * If the gfn and userspace address are not aligned wrt each
643 * other, or if explicitly asked to, disable large page
644 * support for this slot
645 */
646 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
647 !largepages_enabled)
648 for (j = 0; j < lpages; ++j)
649 new.lpage_info[i][j].write_count = 1;
650 }
651
652 skip_lpage:
653
654 /* Allocate page dirty bitmap if needed */
655 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
656 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
657
658 new.dirty_bitmap = vmalloc(dirty_bytes);
659 if (!new.dirty_bitmap)
660 goto out_free;
661 memset(new.dirty_bitmap, 0, dirty_bytes);
662 /* destroy any largepage mappings for dirty tracking */
663 if (old.npages)
664 flush_shadow = 1;
665 }
666 #else /* not defined CONFIG_S390 */
667 new.user_alloc = user_alloc;
668 if (user_alloc)
669 new.userspace_addr = mem->userspace_addr;
670 #endif /* not defined CONFIG_S390 */
671
672 if (!npages) {
673 r = -ENOMEM;
674 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
675 if (!slots)
676 goto out_free;
677 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
678 if (mem->slot >= slots->nmemslots)
679 slots->nmemslots = mem->slot + 1;
680 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
681
682 old_memslots = kvm->memslots;
683 rcu_assign_pointer(kvm->memslots, slots);
684 synchronize_srcu_expedited(&kvm->srcu);
685 /* From this point no new shadow pages pointing to a deleted
686 * memslot will be created.
687 *
688 * validation of sp->gfn happens in:
689 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
690 * - kvm_is_visible_gfn (mmu_check_roots)
691 */
692 kvm_arch_flush_shadow(kvm);
693 kfree(old_memslots);
694 }
695
696 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
697 if (r)
698 goto out_free;
699
700 #ifdef CONFIG_DMAR
701 /* map the pages in iommu page table */
702 if (npages) {
703 r = kvm_iommu_map_pages(kvm, &new);
704 if (r)
705 goto out_free;
706 }
707 #endif
708
709 r = -ENOMEM;
710 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
711 if (!slots)
712 goto out_free;
713 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
714 if (mem->slot >= slots->nmemslots)
715 slots->nmemslots = mem->slot + 1;
716
717 /* actual memory is freed via old in kvm_free_physmem_slot below */
718 if (!npages) {
719 new.rmap = NULL;
720 new.dirty_bitmap = NULL;
721 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
722 new.lpage_info[i] = NULL;
723 }
724
725 slots->memslots[mem->slot] = new;
726 old_memslots = kvm->memslots;
727 rcu_assign_pointer(kvm->memslots, slots);
728 synchronize_srcu_expedited(&kvm->srcu);
729
730 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
731
732 kvm_free_physmem_slot(&old, &new);
733 kfree(old_memslots);
734
735 if (flush_shadow)
736 kvm_arch_flush_shadow(kvm);
737
738 return 0;
739
740 out_free:
741 kvm_free_physmem_slot(&new, &old);
742 out:
743 return r;
744
745 }
746 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
747
748 int kvm_set_memory_region(struct kvm *kvm,
749 struct kvm_userspace_memory_region *mem,
750 int user_alloc)
751 {
752 int r;
753
754 mutex_lock(&kvm->slots_lock);
755 r = __kvm_set_memory_region(kvm, mem, user_alloc);
756 mutex_unlock(&kvm->slots_lock);
757 return r;
758 }
759 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
760
761 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
762 struct
763 kvm_userspace_memory_region *mem,
764 int user_alloc)
765 {
766 if (mem->slot >= KVM_MEMORY_SLOTS)
767 return -EINVAL;
768 return kvm_set_memory_region(kvm, mem, user_alloc);
769 }
770
771 int kvm_get_dirty_log(struct kvm *kvm,
772 struct kvm_dirty_log *log, int *is_dirty)
773 {
774 struct kvm_memory_slot *memslot;
775 int r, i;
776 unsigned long n;
777 unsigned long any = 0;
778
779 r = -EINVAL;
780 if (log->slot >= KVM_MEMORY_SLOTS)
781 goto out;
782
783 memslot = &kvm->memslots->memslots[log->slot];
784 r = -ENOENT;
785 if (!memslot->dirty_bitmap)
786 goto out;
787
788 n = kvm_dirty_bitmap_bytes(memslot);
789
790 for (i = 0; !any && i < n/sizeof(long); ++i)
791 any = memslot->dirty_bitmap[i];
792
793 r = -EFAULT;
794 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
795 goto out;
796
797 if (any)
798 *is_dirty = 1;
799
800 r = 0;
801 out:
802 return r;
803 }
804
805 void kvm_disable_largepages(void)
806 {
807 largepages_enabled = false;
808 }
809 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
810
811 int is_error_page(struct page *page)
812 {
813 return page == bad_page;
814 }
815 EXPORT_SYMBOL_GPL(is_error_page);
816
817 int is_error_pfn(pfn_t pfn)
818 {
819 return pfn == bad_pfn;
820 }
821 EXPORT_SYMBOL_GPL(is_error_pfn);
822
823 static inline unsigned long bad_hva(void)
824 {
825 return PAGE_OFFSET;
826 }
827
828 int kvm_is_error_hva(unsigned long addr)
829 {
830 return addr == bad_hva();
831 }
832 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
833
834 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
835 {
836 int i;
837 struct kvm_memslots *slots = kvm_memslots(kvm);
838
839 for (i = 0; i < slots->nmemslots; ++i) {
840 struct kvm_memory_slot *memslot = &slots->memslots[i];
841
842 if (gfn >= memslot->base_gfn
843 && gfn < memslot->base_gfn + memslot->npages)
844 return memslot;
845 }
846 return NULL;
847 }
848 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
849
850 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
851 {
852 gfn = unalias_gfn(kvm, gfn);
853 return gfn_to_memslot_unaliased(kvm, gfn);
854 }
855
856 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
857 {
858 int i;
859 struct kvm_memslots *slots = kvm_memslots(kvm);
860
861 gfn = unalias_gfn_instantiation(kvm, gfn);
862 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
863 struct kvm_memory_slot *memslot = &slots->memslots[i];
864
865 if (memslot->flags & KVM_MEMSLOT_INVALID)
866 continue;
867
868 if (gfn >= memslot->base_gfn
869 && gfn < memslot->base_gfn + memslot->npages)
870 return 1;
871 }
872 return 0;
873 }
874 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
875
876 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
877 {
878 struct vm_area_struct *vma;
879 unsigned long addr, size;
880
881 size = PAGE_SIZE;
882
883 addr = gfn_to_hva(kvm, gfn);
884 if (kvm_is_error_hva(addr))
885 return PAGE_SIZE;
886
887 down_read(&current->mm->mmap_sem);
888 vma = find_vma(current->mm, addr);
889 if (!vma)
890 goto out;
891
892 size = vma_kernel_pagesize(vma);
893
894 out:
895 up_read(&current->mm->mmap_sem);
896
897 return size;
898 }
899
900 int memslot_id(struct kvm *kvm, gfn_t gfn)
901 {
902 int i;
903 struct kvm_memslots *slots = kvm_memslots(kvm);
904 struct kvm_memory_slot *memslot = NULL;
905
906 gfn = unalias_gfn(kvm, gfn);
907 for (i = 0; i < slots->nmemslots; ++i) {
908 memslot = &slots->memslots[i];
909
910 if (gfn >= memslot->base_gfn
911 && gfn < memslot->base_gfn + memslot->npages)
912 break;
913 }
914
915 return memslot - slots->memslots;
916 }
917
918 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
919 {
920 return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
921 }
922
923 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
924 {
925 struct kvm_memory_slot *slot;
926
927 gfn = unalias_gfn_instantiation(kvm, gfn);
928 slot = gfn_to_memslot_unaliased(kvm, gfn);
929 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
930 return bad_hva();
931 return gfn_to_hva_memslot(slot, gfn);
932 }
933 EXPORT_SYMBOL_GPL(gfn_to_hva);
934
935 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
936 {
937 struct page *page[1];
938 int npages;
939 pfn_t pfn;
940
941 might_sleep();
942
943 npages = get_user_pages_fast(addr, 1, 1, page);
944
945 if (unlikely(npages != 1)) {
946 struct vm_area_struct *vma;
947
948 down_read(&current->mm->mmap_sem);
949 vma = find_vma(current->mm, addr);
950
951 if (vma == NULL || addr < vma->vm_start ||
952 !(vma->vm_flags & VM_PFNMAP)) {
953 up_read(&current->mm->mmap_sem);
954 get_page(bad_page);
955 return page_to_pfn(bad_page);
956 }
957
958 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
959 up_read(&current->mm->mmap_sem);
960 BUG_ON(!kvm_is_mmio_pfn(pfn));
961 } else
962 pfn = page_to_pfn(page[0]);
963
964 return pfn;
965 }
966
967 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
968 {
969 unsigned long addr;
970
971 addr = gfn_to_hva(kvm, gfn);
972 if (kvm_is_error_hva(addr)) {
973 get_page(bad_page);
974 return page_to_pfn(bad_page);
975 }
976
977 return hva_to_pfn(kvm, addr);
978 }
979 EXPORT_SYMBOL_GPL(gfn_to_pfn);
980
981 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
982 struct kvm_memory_slot *slot, gfn_t gfn)
983 {
984 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
985 return hva_to_pfn(kvm, addr);
986 }
987
988 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
989 {
990 pfn_t pfn;
991
992 pfn = gfn_to_pfn(kvm, gfn);
993 if (!kvm_is_mmio_pfn(pfn))
994 return pfn_to_page(pfn);
995
996 WARN_ON(kvm_is_mmio_pfn(pfn));
997
998 get_page(bad_page);
999 return bad_page;
1000 }
1001
1002 EXPORT_SYMBOL_GPL(gfn_to_page);
1003
1004 void kvm_release_page_clean(struct page *page)
1005 {
1006 kvm_release_pfn_clean(page_to_pfn(page));
1007 }
1008 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1009
1010 void kvm_release_pfn_clean(pfn_t pfn)
1011 {
1012 if (!kvm_is_mmio_pfn(pfn))
1013 put_page(pfn_to_page(pfn));
1014 }
1015 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1016
1017 void kvm_release_page_dirty(struct page *page)
1018 {
1019 kvm_release_pfn_dirty(page_to_pfn(page));
1020 }
1021 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1022
1023 void kvm_release_pfn_dirty(pfn_t pfn)
1024 {
1025 kvm_set_pfn_dirty(pfn);
1026 kvm_release_pfn_clean(pfn);
1027 }
1028 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1029
1030 void kvm_set_page_dirty(struct page *page)
1031 {
1032 kvm_set_pfn_dirty(page_to_pfn(page));
1033 }
1034 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1035
1036 void kvm_set_pfn_dirty(pfn_t pfn)
1037 {
1038 if (!kvm_is_mmio_pfn(pfn)) {
1039 struct page *page = pfn_to_page(pfn);
1040 if (!PageReserved(page))
1041 SetPageDirty(page);
1042 }
1043 }
1044 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1045
1046 void kvm_set_pfn_accessed(pfn_t pfn)
1047 {
1048 if (!kvm_is_mmio_pfn(pfn))
1049 mark_page_accessed(pfn_to_page(pfn));
1050 }
1051 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1052
1053 void kvm_get_pfn(pfn_t pfn)
1054 {
1055 if (!kvm_is_mmio_pfn(pfn))
1056 get_page(pfn_to_page(pfn));
1057 }
1058 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1059
1060 static int next_segment(unsigned long len, int offset)
1061 {
1062 if (len > PAGE_SIZE - offset)
1063 return PAGE_SIZE - offset;
1064 else
1065 return len;
1066 }
1067
1068 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1069 int len)
1070 {
1071 int r;
1072 unsigned long addr;
1073
1074 addr = gfn_to_hva(kvm, gfn);
1075 if (kvm_is_error_hva(addr))
1076 return -EFAULT;
1077 r = copy_from_user(data, (void __user *)addr + offset, len);
1078 if (r)
1079 return -EFAULT;
1080 return 0;
1081 }
1082 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1083
1084 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1085 {
1086 gfn_t gfn = gpa >> PAGE_SHIFT;
1087 int seg;
1088 int offset = offset_in_page(gpa);
1089 int ret;
1090
1091 while ((seg = next_segment(len, offset)) != 0) {
1092 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1093 if (ret < 0)
1094 return ret;
1095 offset = 0;
1096 len -= seg;
1097 data += seg;
1098 ++gfn;
1099 }
1100 return 0;
1101 }
1102 EXPORT_SYMBOL_GPL(kvm_read_guest);
1103
1104 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1105 unsigned long len)
1106 {
1107 int r;
1108 unsigned long addr;
1109 gfn_t gfn = gpa >> PAGE_SHIFT;
1110 int offset = offset_in_page(gpa);
1111
1112 addr = gfn_to_hva(kvm, gfn);
1113 if (kvm_is_error_hva(addr))
1114 return -EFAULT;
1115 pagefault_disable();
1116 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1117 pagefault_enable();
1118 if (r)
1119 return -EFAULT;
1120 return 0;
1121 }
1122 EXPORT_SYMBOL(kvm_read_guest_atomic);
1123
1124 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1125 int offset, int len)
1126 {
1127 int r;
1128 unsigned long addr;
1129
1130 addr = gfn_to_hva(kvm, gfn);
1131 if (kvm_is_error_hva(addr))
1132 return -EFAULT;
1133 r = copy_to_user((void __user *)addr + offset, data, len);
1134 if (r)
1135 return -EFAULT;
1136 mark_page_dirty(kvm, gfn);
1137 return 0;
1138 }
1139 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1140
1141 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1142 unsigned long len)
1143 {
1144 gfn_t gfn = gpa >> PAGE_SHIFT;
1145 int seg;
1146 int offset = offset_in_page(gpa);
1147 int ret;
1148
1149 while ((seg = next_segment(len, offset)) != 0) {
1150 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1151 if (ret < 0)
1152 return ret;
1153 offset = 0;
1154 len -= seg;
1155 data += seg;
1156 ++gfn;
1157 }
1158 return 0;
1159 }
1160
1161 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1162 {
1163 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1164 }
1165 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1166
1167 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1168 {
1169 gfn_t gfn = gpa >> PAGE_SHIFT;
1170 int seg;
1171 int offset = offset_in_page(gpa);
1172 int ret;
1173
1174 while ((seg = next_segment(len, offset)) != 0) {
1175 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1176 if (ret < 0)
1177 return ret;
1178 offset = 0;
1179 len -= seg;
1180 ++gfn;
1181 }
1182 return 0;
1183 }
1184 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1185
1186 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1187 {
1188 struct kvm_memory_slot *memslot;
1189
1190 gfn = unalias_gfn(kvm, gfn);
1191 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1192 if (memslot && memslot->dirty_bitmap) {
1193 unsigned long rel_gfn = gfn - memslot->base_gfn;
1194
1195 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1196 }
1197 }
1198
1199 /*
1200 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1201 */
1202 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1203 {
1204 DEFINE_WAIT(wait);
1205
1206 for (;;) {
1207 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1208
1209 if (kvm_arch_vcpu_runnable(vcpu)) {
1210 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1211 break;
1212 }
1213 if (kvm_cpu_has_pending_timer(vcpu))
1214 break;
1215 if (signal_pending(current))
1216 break;
1217
1218 schedule();
1219 }
1220
1221 finish_wait(&vcpu->wq, &wait);
1222 }
1223
1224 void kvm_resched(struct kvm_vcpu *vcpu)
1225 {
1226 if (!need_resched())
1227 return;
1228 cond_resched();
1229 }
1230 EXPORT_SYMBOL_GPL(kvm_resched);
1231
1232 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1233 {
1234 ktime_t expires;
1235 DEFINE_WAIT(wait);
1236
1237 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1238
1239 /* Sleep for 100 us, and hope lock-holder got scheduled */
1240 expires = ktime_add_ns(ktime_get(), 100000UL);
1241 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1242
1243 finish_wait(&vcpu->wq, &wait);
1244 }
1245 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1246
1247 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1248 {
1249 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1250 struct page *page;
1251
1252 if (vmf->pgoff == 0)
1253 page = virt_to_page(vcpu->run);
1254 #ifdef CONFIG_X86
1255 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1256 page = virt_to_page(vcpu->arch.pio_data);
1257 #endif
1258 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1259 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1260 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1261 #endif
1262 else
1263 return VM_FAULT_SIGBUS;
1264 get_page(page);
1265 vmf->page = page;
1266 return 0;
1267 }
1268
1269 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1270 .fault = kvm_vcpu_fault,
1271 };
1272
1273 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1274 {
1275 vma->vm_ops = &kvm_vcpu_vm_ops;
1276 return 0;
1277 }
1278
1279 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1280 {
1281 struct kvm_vcpu *vcpu = filp->private_data;
1282
1283 kvm_put_kvm(vcpu->kvm);
1284 return 0;
1285 }
1286
1287 static struct file_operations kvm_vcpu_fops = {
1288 .release = kvm_vcpu_release,
1289 .unlocked_ioctl = kvm_vcpu_ioctl,
1290 .compat_ioctl = kvm_vcpu_ioctl,
1291 .mmap = kvm_vcpu_mmap,
1292 };
1293
1294 /*
1295 * Allocates an inode for the vcpu.
1296 */
1297 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1298 {
1299 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1300 }
1301
1302 /*
1303 * Creates some virtual cpus. Good luck creating more than one.
1304 */
1305 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1306 {
1307 int r;
1308 struct kvm_vcpu *vcpu, *v;
1309
1310 vcpu = kvm_arch_vcpu_create(kvm, id);
1311 if (IS_ERR(vcpu))
1312 return PTR_ERR(vcpu);
1313
1314 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1315
1316 r = kvm_arch_vcpu_setup(vcpu);
1317 if (r)
1318 return r;
1319
1320 mutex_lock(&kvm->lock);
1321 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1322 r = -EINVAL;
1323 goto vcpu_destroy;
1324 }
1325
1326 kvm_for_each_vcpu(r, v, kvm)
1327 if (v->vcpu_id == id) {
1328 r = -EEXIST;
1329 goto vcpu_destroy;
1330 }
1331
1332 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1333
1334 /* Now it's all set up, let userspace reach it */
1335 kvm_get_kvm(kvm);
1336 r = create_vcpu_fd(vcpu);
1337 if (r < 0) {
1338 kvm_put_kvm(kvm);
1339 goto vcpu_destroy;
1340 }
1341
1342 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1343 smp_wmb();
1344 atomic_inc(&kvm->online_vcpus);
1345
1346 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1347 if (kvm->bsp_vcpu_id == id)
1348 kvm->bsp_vcpu = vcpu;
1349 #endif
1350 mutex_unlock(&kvm->lock);
1351 return r;
1352
1353 vcpu_destroy:
1354 mutex_unlock(&kvm->lock);
1355 kvm_arch_vcpu_destroy(vcpu);
1356 return r;
1357 }
1358
1359 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1360 {
1361 if (sigset) {
1362 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1363 vcpu->sigset_active = 1;
1364 vcpu->sigset = *sigset;
1365 } else
1366 vcpu->sigset_active = 0;
1367 return 0;
1368 }
1369
1370 static long kvm_vcpu_ioctl(struct file *filp,
1371 unsigned int ioctl, unsigned long arg)
1372 {
1373 struct kvm_vcpu *vcpu = filp->private_data;
1374 void __user *argp = (void __user *)arg;
1375 int r;
1376 struct kvm_fpu *fpu = NULL;
1377 struct kvm_sregs *kvm_sregs = NULL;
1378
1379 if (vcpu->kvm->mm != current->mm)
1380 return -EIO;
1381 switch (ioctl) {
1382 case KVM_RUN:
1383 r = -EINVAL;
1384 if (arg)
1385 goto out;
1386 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1387 break;
1388 case KVM_GET_REGS: {
1389 struct kvm_regs *kvm_regs;
1390
1391 r = -ENOMEM;
1392 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1393 if (!kvm_regs)
1394 goto out;
1395 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1396 if (r)
1397 goto out_free1;
1398 r = -EFAULT;
1399 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1400 goto out_free1;
1401 r = 0;
1402 out_free1:
1403 kfree(kvm_regs);
1404 break;
1405 }
1406 case KVM_SET_REGS: {
1407 struct kvm_regs *kvm_regs;
1408
1409 r = -ENOMEM;
1410 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1411 if (!kvm_regs)
1412 goto out;
1413 r = -EFAULT;
1414 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1415 goto out_free2;
1416 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1417 if (r)
1418 goto out_free2;
1419 r = 0;
1420 out_free2:
1421 kfree(kvm_regs);
1422 break;
1423 }
1424 case KVM_GET_SREGS: {
1425 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1426 r = -ENOMEM;
1427 if (!kvm_sregs)
1428 goto out;
1429 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1430 if (r)
1431 goto out;
1432 r = -EFAULT;
1433 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1434 goto out;
1435 r = 0;
1436 break;
1437 }
1438 case KVM_SET_SREGS: {
1439 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1440 r = -ENOMEM;
1441 if (!kvm_sregs)
1442 goto out;
1443 r = -EFAULT;
1444 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1445 goto out;
1446 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1447 if (r)
1448 goto out;
1449 r = 0;
1450 break;
1451 }
1452 case KVM_GET_MP_STATE: {
1453 struct kvm_mp_state mp_state;
1454
1455 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1456 if (r)
1457 goto out;
1458 r = -EFAULT;
1459 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1460 goto out;
1461 r = 0;
1462 break;
1463 }
1464 case KVM_SET_MP_STATE: {
1465 struct kvm_mp_state mp_state;
1466
1467 r = -EFAULT;
1468 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1469 goto out;
1470 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1471 if (r)
1472 goto out;
1473 r = 0;
1474 break;
1475 }
1476 case KVM_TRANSLATE: {
1477 struct kvm_translation tr;
1478
1479 r = -EFAULT;
1480 if (copy_from_user(&tr, argp, sizeof tr))
1481 goto out;
1482 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1483 if (r)
1484 goto out;
1485 r = -EFAULT;
1486 if (copy_to_user(argp, &tr, sizeof tr))
1487 goto out;
1488 r = 0;
1489 break;
1490 }
1491 case KVM_SET_GUEST_DEBUG: {
1492 struct kvm_guest_debug dbg;
1493
1494 r = -EFAULT;
1495 if (copy_from_user(&dbg, argp, sizeof dbg))
1496 goto out;
1497 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1498 if (r)
1499 goto out;
1500 r = 0;
1501 break;
1502 }
1503 case KVM_SET_SIGNAL_MASK: {
1504 struct kvm_signal_mask __user *sigmask_arg = argp;
1505 struct kvm_signal_mask kvm_sigmask;
1506 sigset_t sigset, *p;
1507
1508 p = NULL;
1509 if (argp) {
1510 r = -EFAULT;
1511 if (copy_from_user(&kvm_sigmask, argp,
1512 sizeof kvm_sigmask))
1513 goto out;
1514 r = -EINVAL;
1515 if (kvm_sigmask.len != sizeof sigset)
1516 goto out;
1517 r = -EFAULT;
1518 if (copy_from_user(&sigset, sigmask_arg->sigset,
1519 sizeof sigset))
1520 goto out;
1521 p = &sigset;
1522 }
1523 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1524 break;
1525 }
1526 case KVM_GET_FPU: {
1527 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1528 r = -ENOMEM;
1529 if (!fpu)
1530 goto out;
1531 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1532 if (r)
1533 goto out;
1534 r = -EFAULT;
1535 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1536 goto out;
1537 r = 0;
1538 break;
1539 }
1540 case KVM_SET_FPU: {
1541 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1542 r = -ENOMEM;
1543 if (!fpu)
1544 goto out;
1545 r = -EFAULT;
1546 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1547 goto out;
1548 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1549 if (r)
1550 goto out;
1551 r = 0;
1552 break;
1553 }
1554 default:
1555 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1556 }
1557 out:
1558 kfree(fpu);
1559 kfree(kvm_sregs);
1560 return r;
1561 }
1562
1563 static long kvm_vm_ioctl(struct file *filp,
1564 unsigned int ioctl, unsigned long arg)
1565 {
1566 struct kvm *kvm = filp->private_data;
1567 void __user *argp = (void __user *)arg;
1568 int r;
1569
1570 if (kvm->mm != current->mm)
1571 return -EIO;
1572 switch (ioctl) {
1573 case KVM_CREATE_VCPU:
1574 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1575 if (r < 0)
1576 goto out;
1577 break;
1578 case KVM_SET_USER_MEMORY_REGION: {
1579 struct kvm_userspace_memory_region kvm_userspace_mem;
1580
1581 r = -EFAULT;
1582 if (copy_from_user(&kvm_userspace_mem, argp,
1583 sizeof kvm_userspace_mem))
1584 goto out;
1585
1586 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1587 if (r)
1588 goto out;
1589 break;
1590 }
1591 case KVM_GET_DIRTY_LOG: {
1592 struct kvm_dirty_log log;
1593
1594 r = -EFAULT;
1595 if (copy_from_user(&log, argp, sizeof log))
1596 goto out;
1597 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1598 if (r)
1599 goto out;
1600 break;
1601 }
1602 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1603 case KVM_REGISTER_COALESCED_MMIO: {
1604 struct kvm_coalesced_mmio_zone zone;
1605 r = -EFAULT;
1606 if (copy_from_user(&zone, argp, sizeof zone))
1607 goto out;
1608 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1609 if (r)
1610 goto out;
1611 r = 0;
1612 break;
1613 }
1614 case KVM_UNREGISTER_COALESCED_MMIO: {
1615 struct kvm_coalesced_mmio_zone zone;
1616 r = -EFAULT;
1617 if (copy_from_user(&zone, argp, sizeof zone))
1618 goto out;
1619 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1620 if (r)
1621 goto out;
1622 r = 0;
1623 break;
1624 }
1625 #endif
1626 case KVM_IRQFD: {
1627 struct kvm_irqfd data;
1628
1629 r = -EFAULT;
1630 if (copy_from_user(&data, argp, sizeof data))
1631 goto out;
1632 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1633 break;
1634 }
1635 case KVM_IOEVENTFD: {
1636 struct kvm_ioeventfd data;
1637
1638 r = -EFAULT;
1639 if (copy_from_user(&data, argp, sizeof data))
1640 goto out;
1641 r = kvm_ioeventfd(kvm, &data);
1642 break;
1643 }
1644 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1645 case KVM_SET_BOOT_CPU_ID:
1646 r = 0;
1647 mutex_lock(&kvm->lock);
1648 if (atomic_read(&kvm->online_vcpus) != 0)
1649 r = -EBUSY;
1650 else
1651 kvm->bsp_vcpu_id = arg;
1652 mutex_unlock(&kvm->lock);
1653 break;
1654 #endif
1655 default:
1656 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1657 if (r == -ENOTTY)
1658 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1659 }
1660 out:
1661 return r;
1662 }
1663
1664 #ifdef CONFIG_COMPAT
1665 struct compat_kvm_dirty_log {
1666 __u32 slot;
1667 __u32 padding1;
1668 union {
1669 compat_uptr_t dirty_bitmap; /* one bit per page */
1670 __u64 padding2;
1671 };
1672 };
1673
1674 static long kvm_vm_compat_ioctl(struct file *filp,
1675 unsigned int ioctl, unsigned long arg)
1676 {
1677 struct kvm *kvm = filp->private_data;
1678 int r;
1679
1680 if (kvm->mm != current->mm)
1681 return -EIO;
1682 switch (ioctl) {
1683 case KVM_GET_DIRTY_LOG: {
1684 struct compat_kvm_dirty_log compat_log;
1685 struct kvm_dirty_log log;
1686
1687 r = -EFAULT;
1688 if (copy_from_user(&compat_log, (void __user *)arg,
1689 sizeof(compat_log)))
1690 goto out;
1691 log.slot = compat_log.slot;
1692 log.padding1 = compat_log.padding1;
1693 log.padding2 = compat_log.padding2;
1694 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1695
1696 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1697 if (r)
1698 goto out;
1699 break;
1700 }
1701 default:
1702 r = kvm_vm_ioctl(filp, ioctl, arg);
1703 }
1704
1705 out:
1706 return r;
1707 }
1708 #endif
1709
1710 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1711 {
1712 struct page *page[1];
1713 unsigned long addr;
1714 int npages;
1715 gfn_t gfn = vmf->pgoff;
1716 struct kvm *kvm = vma->vm_file->private_data;
1717
1718 addr = gfn_to_hva(kvm, gfn);
1719 if (kvm_is_error_hva(addr))
1720 return VM_FAULT_SIGBUS;
1721
1722 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1723 NULL);
1724 if (unlikely(npages != 1))
1725 return VM_FAULT_SIGBUS;
1726
1727 vmf->page = page[0];
1728 return 0;
1729 }
1730
1731 static const struct vm_operations_struct kvm_vm_vm_ops = {
1732 .fault = kvm_vm_fault,
1733 };
1734
1735 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1736 {
1737 vma->vm_ops = &kvm_vm_vm_ops;
1738 return 0;
1739 }
1740
1741 static struct file_operations kvm_vm_fops = {
1742 .release = kvm_vm_release,
1743 .unlocked_ioctl = kvm_vm_ioctl,
1744 #ifdef CONFIG_COMPAT
1745 .compat_ioctl = kvm_vm_compat_ioctl,
1746 #endif
1747 .mmap = kvm_vm_mmap,
1748 };
1749
1750 static int kvm_dev_ioctl_create_vm(void)
1751 {
1752 int fd, r;
1753 struct kvm *kvm;
1754
1755 kvm = kvm_create_vm();
1756 if (IS_ERR(kvm))
1757 return PTR_ERR(kvm);
1758 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1759 r = kvm_coalesced_mmio_init(kvm);
1760 if (r < 0) {
1761 kvm_put_kvm(kvm);
1762 return r;
1763 }
1764 #endif
1765 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1766 if (fd < 0)
1767 kvm_put_kvm(kvm);
1768
1769 return fd;
1770 }
1771
1772 static long kvm_dev_ioctl_check_extension_generic(long arg)
1773 {
1774 switch (arg) {
1775 case KVM_CAP_USER_MEMORY:
1776 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1777 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1778 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1779 case KVM_CAP_SET_BOOT_CPU_ID:
1780 #endif
1781 case KVM_CAP_INTERNAL_ERROR_DATA:
1782 return 1;
1783 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1784 case KVM_CAP_IRQ_ROUTING:
1785 return KVM_MAX_IRQ_ROUTES;
1786 #endif
1787 default:
1788 break;
1789 }
1790 return kvm_dev_ioctl_check_extension(arg);
1791 }
1792
1793 static long kvm_dev_ioctl(struct file *filp,
1794 unsigned int ioctl, unsigned long arg)
1795 {
1796 long r = -EINVAL;
1797
1798 switch (ioctl) {
1799 case KVM_GET_API_VERSION:
1800 r = -EINVAL;
1801 if (arg)
1802 goto out;
1803 r = KVM_API_VERSION;
1804 break;
1805 case KVM_CREATE_VM:
1806 r = -EINVAL;
1807 if (arg)
1808 goto out;
1809 r = kvm_dev_ioctl_create_vm();
1810 break;
1811 case KVM_CHECK_EXTENSION:
1812 r = kvm_dev_ioctl_check_extension_generic(arg);
1813 break;
1814 case KVM_GET_VCPU_MMAP_SIZE:
1815 r = -EINVAL;
1816 if (arg)
1817 goto out;
1818 r = PAGE_SIZE; /* struct kvm_run */
1819 #ifdef CONFIG_X86
1820 r += PAGE_SIZE; /* pio data page */
1821 #endif
1822 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1823 r += PAGE_SIZE; /* coalesced mmio ring page */
1824 #endif
1825 break;
1826 case KVM_TRACE_ENABLE:
1827 case KVM_TRACE_PAUSE:
1828 case KVM_TRACE_DISABLE:
1829 r = -EOPNOTSUPP;
1830 break;
1831 default:
1832 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1833 }
1834 out:
1835 return r;
1836 }
1837
1838 static struct file_operations kvm_chardev_ops = {
1839 .unlocked_ioctl = kvm_dev_ioctl,
1840 .compat_ioctl = kvm_dev_ioctl,
1841 };
1842
1843 static struct miscdevice kvm_dev = {
1844 KVM_MINOR,
1845 "kvm",
1846 &kvm_chardev_ops,
1847 };
1848
1849 static void hardware_enable(void *junk)
1850 {
1851 int cpu = raw_smp_processor_id();
1852 int r;
1853
1854 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1855 return;
1856
1857 cpumask_set_cpu(cpu, cpus_hardware_enabled);
1858
1859 r = kvm_arch_hardware_enable(NULL);
1860
1861 if (r) {
1862 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1863 atomic_inc(&hardware_enable_failed);
1864 printk(KERN_INFO "kvm: enabling virtualization on "
1865 "CPU%d failed\n", cpu);
1866 }
1867 }
1868
1869 static void hardware_disable(void *junk)
1870 {
1871 int cpu = raw_smp_processor_id();
1872
1873 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1874 return;
1875 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1876 kvm_arch_hardware_disable(NULL);
1877 }
1878
1879 static void hardware_disable_all_nolock(void)
1880 {
1881 BUG_ON(!kvm_usage_count);
1882
1883 kvm_usage_count--;
1884 if (!kvm_usage_count)
1885 on_each_cpu(hardware_disable, NULL, 1);
1886 }
1887
1888 static void hardware_disable_all(void)
1889 {
1890 spin_lock(&kvm_lock);
1891 hardware_disable_all_nolock();
1892 spin_unlock(&kvm_lock);
1893 }
1894
1895 static int hardware_enable_all(void)
1896 {
1897 int r = 0;
1898
1899 spin_lock(&kvm_lock);
1900
1901 kvm_usage_count++;
1902 if (kvm_usage_count == 1) {
1903 atomic_set(&hardware_enable_failed, 0);
1904 on_each_cpu(hardware_enable, NULL, 1);
1905
1906 if (atomic_read(&hardware_enable_failed)) {
1907 hardware_disable_all_nolock();
1908 r = -EBUSY;
1909 }
1910 }
1911
1912 spin_unlock(&kvm_lock);
1913
1914 return r;
1915 }
1916
1917 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1918 void *v)
1919 {
1920 int cpu = (long)v;
1921
1922 if (!kvm_usage_count)
1923 return NOTIFY_OK;
1924
1925 val &= ~CPU_TASKS_FROZEN;
1926 switch (val) {
1927 case CPU_DYING:
1928 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1929 cpu);
1930 hardware_disable(NULL);
1931 break;
1932 case CPU_ONLINE:
1933 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1934 cpu);
1935 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1936 break;
1937 }
1938 return NOTIFY_OK;
1939 }
1940
1941
1942 asmlinkage void kvm_handle_fault_on_reboot(void)
1943 {
1944 if (kvm_rebooting)
1945 /* spin while reset goes on */
1946 while (true)
1947 ;
1948 /* Fault while not rebooting. We want the trace. */
1949 BUG();
1950 }
1951 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1952
1953 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1954 void *v)
1955 {
1956 /*
1957 * Some (well, at least mine) BIOSes hang on reboot if
1958 * in vmx root mode.
1959 *
1960 * And Intel TXT required VMX off for all cpu when system shutdown.
1961 */
1962 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1963 kvm_rebooting = true;
1964 on_each_cpu(hardware_disable, NULL, 1);
1965 return NOTIFY_OK;
1966 }
1967
1968 static struct notifier_block kvm_reboot_notifier = {
1969 .notifier_call = kvm_reboot,
1970 .priority = 0,
1971 };
1972
1973 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1974 {
1975 int i;
1976
1977 for (i = 0; i < bus->dev_count; i++) {
1978 struct kvm_io_device *pos = bus->devs[i];
1979
1980 kvm_iodevice_destructor(pos);
1981 }
1982 kfree(bus);
1983 }
1984
1985 /* kvm_io_bus_write - called under kvm->slots_lock */
1986 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
1987 int len, const void *val)
1988 {
1989 int i;
1990 struct kvm_io_bus *bus;
1991
1992 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
1993 for (i = 0; i < bus->dev_count; i++)
1994 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
1995 return 0;
1996 return -EOPNOTSUPP;
1997 }
1998
1999 /* kvm_io_bus_read - called under kvm->slots_lock */
2000 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2001 int len, void *val)
2002 {
2003 int i;
2004 struct kvm_io_bus *bus;
2005
2006 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2007 for (i = 0; i < bus->dev_count; i++)
2008 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2009 return 0;
2010 return -EOPNOTSUPP;
2011 }
2012
2013 /* Caller must hold slots_lock. */
2014 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2015 struct kvm_io_device *dev)
2016 {
2017 struct kvm_io_bus *new_bus, *bus;
2018
2019 bus = kvm->buses[bus_idx];
2020 if (bus->dev_count > NR_IOBUS_DEVS-1)
2021 return -ENOSPC;
2022
2023 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2024 if (!new_bus)
2025 return -ENOMEM;
2026 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2027 new_bus->devs[new_bus->dev_count++] = dev;
2028 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2029 synchronize_srcu_expedited(&kvm->srcu);
2030 kfree(bus);
2031
2032 return 0;
2033 }
2034
2035 /* Caller must hold slots_lock. */
2036 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2037 struct kvm_io_device *dev)
2038 {
2039 int i, r;
2040 struct kvm_io_bus *new_bus, *bus;
2041
2042 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2043 if (!new_bus)
2044 return -ENOMEM;
2045
2046 bus = kvm->buses[bus_idx];
2047 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2048
2049 r = -ENOENT;
2050 for (i = 0; i < new_bus->dev_count; i++)
2051 if (new_bus->devs[i] == dev) {
2052 r = 0;
2053 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2054 break;
2055 }
2056
2057 if (r) {
2058 kfree(new_bus);
2059 return r;
2060 }
2061
2062 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2063 synchronize_srcu_expedited(&kvm->srcu);
2064 kfree(bus);
2065 return r;
2066 }
2067
2068 static struct notifier_block kvm_cpu_notifier = {
2069 .notifier_call = kvm_cpu_hotplug,
2070 .priority = 20, /* must be > scheduler priority */
2071 };
2072
2073 static int vm_stat_get(void *_offset, u64 *val)
2074 {
2075 unsigned offset = (long)_offset;
2076 struct kvm *kvm;
2077
2078 *val = 0;
2079 spin_lock(&kvm_lock);
2080 list_for_each_entry(kvm, &vm_list, vm_list)
2081 *val += *(u32 *)((void *)kvm + offset);
2082 spin_unlock(&kvm_lock);
2083 return 0;
2084 }
2085
2086 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2087
2088 static int vcpu_stat_get(void *_offset, u64 *val)
2089 {
2090 unsigned offset = (long)_offset;
2091 struct kvm *kvm;
2092 struct kvm_vcpu *vcpu;
2093 int i;
2094
2095 *val = 0;
2096 spin_lock(&kvm_lock);
2097 list_for_each_entry(kvm, &vm_list, vm_list)
2098 kvm_for_each_vcpu(i, vcpu, kvm)
2099 *val += *(u32 *)((void *)vcpu + offset);
2100
2101 spin_unlock(&kvm_lock);
2102 return 0;
2103 }
2104
2105 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2106
2107 static const struct file_operations *stat_fops[] = {
2108 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2109 [KVM_STAT_VM] = &vm_stat_fops,
2110 };
2111
2112 static void kvm_init_debug(void)
2113 {
2114 struct kvm_stats_debugfs_item *p;
2115
2116 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2117 for (p = debugfs_entries; p->name; ++p)
2118 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2119 (void *)(long)p->offset,
2120 stat_fops[p->kind]);
2121 }
2122
2123 static void kvm_exit_debug(void)
2124 {
2125 struct kvm_stats_debugfs_item *p;
2126
2127 for (p = debugfs_entries; p->name; ++p)
2128 debugfs_remove(p->dentry);
2129 debugfs_remove(kvm_debugfs_dir);
2130 }
2131
2132 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2133 {
2134 if (kvm_usage_count)
2135 hardware_disable(NULL);
2136 return 0;
2137 }
2138
2139 static int kvm_resume(struct sys_device *dev)
2140 {
2141 if (kvm_usage_count)
2142 hardware_enable(NULL);
2143 return 0;
2144 }
2145
2146 static struct sysdev_class kvm_sysdev_class = {
2147 .name = "kvm",
2148 .suspend = kvm_suspend,
2149 .resume = kvm_resume,
2150 };
2151
2152 static struct sys_device kvm_sysdev = {
2153 .id = 0,
2154 .cls = &kvm_sysdev_class,
2155 };
2156
2157 struct page *bad_page;
2158 pfn_t bad_pfn;
2159
2160 static inline
2161 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2162 {
2163 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2164 }
2165
2166 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2167 {
2168 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2169
2170 kvm_arch_vcpu_load(vcpu, cpu);
2171 }
2172
2173 static void kvm_sched_out(struct preempt_notifier *pn,
2174 struct task_struct *next)
2175 {
2176 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2177
2178 kvm_arch_vcpu_put(vcpu);
2179 }
2180
2181 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2182 struct module *module)
2183 {
2184 int r;
2185 int cpu;
2186
2187 r = kvm_arch_init(opaque);
2188 if (r)
2189 goto out_fail;
2190
2191 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2192
2193 if (bad_page == NULL) {
2194 r = -ENOMEM;
2195 goto out;
2196 }
2197
2198 bad_pfn = page_to_pfn(bad_page);
2199
2200 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2201 r = -ENOMEM;
2202 goto out_free_0;
2203 }
2204
2205 r = kvm_arch_hardware_setup();
2206 if (r < 0)
2207 goto out_free_0a;
2208
2209 for_each_online_cpu(cpu) {
2210 smp_call_function_single(cpu,
2211 kvm_arch_check_processor_compat,
2212 &r, 1);
2213 if (r < 0)
2214 goto out_free_1;
2215 }
2216
2217 r = register_cpu_notifier(&kvm_cpu_notifier);
2218 if (r)
2219 goto out_free_2;
2220 register_reboot_notifier(&kvm_reboot_notifier);
2221
2222 r = sysdev_class_register(&kvm_sysdev_class);
2223 if (r)
2224 goto out_free_3;
2225
2226 r = sysdev_register(&kvm_sysdev);
2227 if (r)
2228 goto out_free_4;
2229
2230 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2231 if (!vcpu_align)
2232 vcpu_align = __alignof__(struct kvm_vcpu);
2233 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2234 0, NULL);
2235 if (!kvm_vcpu_cache) {
2236 r = -ENOMEM;
2237 goto out_free_5;
2238 }
2239
2240 kvm_chardev_ops.owner = module;
2241 kvm_vm_fops.owner = module;
2242 kvm_vcpu_fops.owner = module;
2243
2244 r = misc_register(&kvm_dev);
2245 if (r) {
2246 printk(KERN_ERR "kvm: misc device register failed\n");
2247 goto out_free;
2248 }
2249
2250 kvm_preempt_ops.sched_in = kvm_sched_in;
2251 kvm_preempt_ops.sched_out = kvm_sched_out;
2252
2253 kvm_init_debug();
2254
2255 return 0;
2256
2257 out_free:
2258 kmem_cache_destroy(kvm_vcpu_cache);
2259 out_free_5:
2260 sysdev_unregister(&kvm_sysdev);
2261 out_free_4:
2262 sysdev_class_unregister(&kvm_sysdev_class);
2263 out_free_3:
2264 unregister_reboot_notifier(&kvm_reboot_notifier);
2265 unregister_cpu_notifier(&kvm_cpu_notifier);
2266 out_free_2:
2267 out_free_1:
2268 kvm_arch_hardware_unsetup();
2269 out_free_0a:
2270 free_cpumask_var(cpus_hardware_enabled);
2271 out_free_0:
2272 __free_page(bad_page);
2273 out:
2274 kvm_arch_exit();
2275 out_fail:
2276 return r;
2277 }
2278 EXPORT_SYMBOL_GPL(kvm_init);
2279
2280 void kvm_exit(void)
2281 {
2282 kvm_exit_debug();
2283 misc_deregister(&kvm_dev);
2284 kmem_cache_destroy(kvm_vcpu_cache);
2285 sysdev_unregister(&kvm_sysdev);
2286 sysdev_class_unregister(&kvm_sysdev_class);
2287 unregister_reboot_notifier(&kvm_reboot_notifier);
2288 unregister_cpu_notifier(&kvm_cpu_notifier);
2289 on_each_cpu(hardware_disable, NULL, 1);
2290 kvm_arch_hardware_unsetup();
2291 kvm_arch_exit();
2292 free_cpumask_var(cpus_hardware_enabled);
2293 __free_page(bad_page);
2294 }
2295 EXPORT_SYMBOL_GPL(kvm_exit);
WandBoard kernel