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1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux |
3 | * |
4 | * This module enables machines with Intel VT-x extensions to run virtual |
5 | * machines without emulation or binary translation. |
6 | * |
7 | * Copyright (C) 2006 Qumranet, Inc. |
8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
9 | * |
10 | * Authors: |
11 | * Avi Kivity <avi@qumranet.com> |
12 | * Yaniv Kamay <yaniv@qumranet.com> |
13 | * |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See |
15 | * the COPYING file in the top-level directory. |
16 | * |
17 | */ |
18 | |
19 | #include "iodev.h" |
20 | |
21 | #include <linux/kvm_host.h> |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> |
24 | #include <linux/errno.h> |
25 | #include <linux/percpu.h> |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> |
28 | #include <linux/vmalloc.h> |
29 | #include <linux/reboot.h> |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> |
32 | #include <linux/file.h> |
33 | #include <linux/syscore_ops.h> |
34 | #include <linux/cpu.h> |
35 | #include <linux/sched.h> |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> |
38 | #include <linux/anon_inodes.h> |
39 | #include <linux/profile.h> |
40 | #include <linux/kvm_para.h> |
41 | #include <linux/pagemap.h> |
42 | #include <linux/mman.h> |
43 | #include <linux/swap.h> |
44 | #include <linux/bitops.h> |
45 | #include <linux/spinlock.h> |
46 | #include <linux/compat.h> |
47 | #include <linux/srcu.h> |
48 | #include <linux/hugetlb.h> |
49 | #include <linux/slab.h> |
50 | #include <linux/sort.h> |
51 | #include <linux/bsearch.h> |
52 | |
53 | #include <asm/processor.h> |
54 | #include <asm/io.h> |
55 | #include <asm/uaccess.h> |
56 | #include <asm/pgtable.h> |
57 | |
58 | #include "coalesced_mmio.h" |
59 | #include "async_pf.h" |
60 | |
61 | #define CREATE_TRACE_POINTS |
62 | #include <trace/events/kvm.h> |
63 | |
64 | MODULE_AUTHOR("Qumranet"); |
65 | MODULE_LICENSE("GPL"); |
66 | |
67 | /* |
68 | * Ordering of locks: |
69 | * |
70 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
71 | */ |
72 | |
73 | DEFINE_RAW_SPINLOCK(kvm_lock); |
74 | LIST_HEAD(vm_list); |
75 | |
76 | static cpumask_var_t cpus_hardware_enabled; |
77 | static int kvm_usage_count = 0; |
78 | static atomic_t hardware_enable_failed; |
79 | |
80 | struct kmem_cache *kvm_vcpu_cache; |
81 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); |
82 | |
83 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
84 | |
85 | struct dentry *kvm_debugfs_dir; |
86 | |
87 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
88 | unsigned long arg); |
89 | #ifdef CONFIG_COMPAT |
90 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
91 | unsigned long arg); |
92 | #endif |
93 | static int hardware_enable_all(void); |
94 | static void hardware_disable_all(void); |
95 | |
96 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
97 | |
98 | bool kvm_rebooting; |
99 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
100 | |
101 | static bool largepages_enabled = true; |
102 | |
103 | static struct page *hwpoison_page; |
104 | static pfn_t hwpoison_pfn; |
105 | |
106 | struct page *fault_page; |
107 | pfn_t fault_pfn; |
108 | |
109 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
110 | { |
111 | if (pfn_valid(pfn)) { |
112 | int reserved; |
113 | struct page *tail = pfn_to_page(pfn); |
114 | struct page *head = compound_trans_head(tail); |
115 | reserved = PageReserved(head); |
116 | if (head != tail) { |
117 | /* |
118 | * "head" is not a dangling pointer |
119 | * (compound_trans_head takes care of that) |
120 | * but the hugepage may have been splitted |
121 | * from under us (and we may not hold a |
122 | * reference count on the head page so it can |
123 | * be reused before we run PageReferenced), so |
124 | * we've to check PageTail before returning |
125 | * what we just read. |
126 | */ |
127 | smp_rmb(); |
128 | if (PageTail(tail)) |
129 | return reserved; |
130 | } |
131 | return PageReserved(tail); |
132 | } |
133 | |
134 | return true; |
135 | } |
136 | |
137 | /* |
138 | * Switches to specified vcpu, until a matching vcpu_put() |
139 | */ |
140 | void vcpu_load(struct kvm_vcpu *vcpu) |
141 | { |
142 | int cpu; |
143 | |
144 | mutex_lock(&vcpu->mutex); |
145 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
146 | /* The thread running this VCPU changed. */ |
147 | struct pid *oldpid = vcpu->pid; |
148 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); |
149 | rcu_assign_pointer(vcpu->pid, newpid); |
150 | synchronize_rcu(); |
151 | put_pid(oldpid); |
152 | } |
153 | cpu = get_cpu(); |
154 | preempt_notifier_register(&vcpu->preempt_notifier); |
155 | kvm_arch_vcpu_load(vcpu, cpu); |
156 | put_cpu(); |
157 | } |
158 | |
159 | void vcpu_put(struct kvm_vcpu *vcpu) |
160 | { |
161 | preempt_disable(); |
162 | kvm_arch_vcpu_put(vcpu); |
163 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
164 | preempt_enable(); |
165 | mutex_unlock(&vcpu->mutex); |
166 | } |
167 | |
168 | static void ack_flush(void *_completed) |
169 | { |
170 | } |
171 | |
172 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
173 | { |
174 | int i, cpu, me; |
175 | cpumask_var_t cpus; |
176 | bool called = true; |
177 | struct kvm_vcpu *vcpu; |
178 | |
179 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
180 | |
181 | me = get_cpu(); |
182 | kvm_for_each_vcpu(i, vcpu, kvm) { |
183 | kvm_make_request(req, vcpu); |
184 | cpu = vcpu->cpu; |
185 | |
186 | /* Set ->requests bit before we read ->mode */ |
187 | smp_mb(); |
188 | |
189 | if (cpus != NULL && cpu != -1 && cpu != me && |
190 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) |
191 | cpumask_set_cpu(cpu, cpus); |
192 | } |
193 | if (unlikely(cpus == NULL)) |
194 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); |
195 | else if (!cpumask_empty(cpus)) |
196 | smp_call_function_many(cpus, ack_flush, NULL, 1); |
197 | else |
198 | called = false; |
199 | put_cpu(); |
200 | free_cpumask_var(cpus); |
201 | return called; |
202 | } |
203 | |
204 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
205 | { |
206 | int dirty_count = kvm->tlbs_dirty; |
207 | |
208 | smp_mb(); |
209 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
210 | ++kvm->stat.remote_tlb_flush; |
211 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
212 | } |
213 | |
214 | void kvm_reload_remote_mmus(struct kvm *kvm) |
215 | { |
216 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
217 | } |
218 | |
219 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
220 | { |
221 | struct page *page; |
222 | int r; |
223 | |
224 | mutex_init(&vcpu->mutex); |
225 | vcpu->cpu = -1; |
226 | vcpu->kvm = kvm; |
227 | vcpu->vcpu_id = id; |
228 | vcpu->pid = NULL; |
229 | init_waitqueue_head(&vcpu->wq); |
230 | kvm_async_pf_vcpu_init(vcpu); |
231 | |
232 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
233 | if (!page) { |
234 | r = -ENOMEM; |
235 | goto fail; |
236 | } |
237 | vcpu->run = page_address(page); |
238 | |
239 | r = kvm_arch_vcpu_init(vcpu); |
240 | if (r < 0) |
241 | goto fail_free_run; |
242 | return 0; |
243 | |
244 | fail_free_run: |
245 | free_page((unsigned long)vcpu->run); |
246 | fail: |
247 | return r; |
248 | } |
249 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); |
250 | |
251 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) |
252 | { |
253 | put_pid(vcpu->pid); |
254 | kvm_arch_vcpu_uninit(vcpu); |
255 | free_page((unsigned long)vcpu->run); |
256 | } |
257 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); |
258 | |
259 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
260 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) |
261 | { |
262 | return container_of(mn, struct kvm, mmu_notifier); |
263 | } |
264 | |
265 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, |
266 | struct mm_struct *mm, |
267 | unsigned long address) |
268 | { |
269 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
270 | int need_tlb_flush, idx; |
271 | |
272 | /* |
273 | * When ->invalidate_page runs, the linux pte has been zapped |
274 | * already but the page is still allocated until |
275 | * ->invalidate_page returns. So if we increase the sequence |
276 | * here the kvm page fault will notice if the spte can't be |
277 | * established because the page is going to be freed. If |
278 | * instead the kvm page fault establishes the spte before |
279 | * ->invalidate_page runs, kvm_unmap_hva will release it |
280 | * before returning. |
281 | * |
282 | * The sequence increase only need to be seen at spin_unlock |
283 | * time, and not at spin_lock time. |
284 | * |
285 | * Increasing the sequence after the spin_unlock would be |
286 | * unsafe because the kvm page fault could then establish the |
287 | * pte after kvm_unmap_hva returned, without noticing the page |
288 | * is going to be freed. |
289 | */ |
290 | idx = srcu_read_lock(&kvm->srcu); |
291 | spin_lock(&kvm->mmu_lock); |
292 | kvm->mmu_notifier_seq++; |
293 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
294 | spin_unlock(&kvm->mmu_lock); |
295 | srcu_read_unlock(&kvm->srcu, idx); |
296 | |
297 | /* we've to flush the tlb before the pages can be freed */ |
298 | if (need_tlb_flush) |
299 | kvm_flush_remote_tlbs(kvm); |
300 | |
301 | } |
302 | |
303 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
304 | struct mm_struct *mm, |
305 | unsigned long address, |
306 | pte_t pte) |
307 | { |
308 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
309 | int idx; |
310 | |
311 | idx = srcu_read_lock(&kvm->srcu); |
312 | spin_lock(&kvm->mmu_lock); |
313 | kvm->mmu_notifier_seq++; |
314 | kvm_set_spte_hva(kvm, address, pte); |
315 | spin_unlock(&kvm->mmu_lock); |
316 | srcu_read_unlock(&kvm->srcu, idx); |
317 | } |
318 | |
319 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
320 | struct mm_struct *mm, |
321 | unsigned long start, |
322 | unsigned long end) |
323 | { |
324 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
325 | int need_tlb_flush = 0, idx; |
326 | |
327 | idx = srcu_read_lock(&kvm->srcu); |
328 | spin_lock(&kvm->mmu_lock); |
329 | /* |
330 | * The count increase must become visible at unlock time as no |
331 | * spte can be established without taking the mmu_lock and |
332 | * count is also read inside the mmu_lock critical section. |
333 | */ |
334 | kvm->mmu_notifier_count++; |
335 | for (; start < end; start += PAGE_SIZE) |
336 | need_tlb_flush |= kvm_unmap_hva(kvm, start); |
337 | need_tlb_flush |= kvm->tlbs_dirty; |
338 | spin_unlock(&kvm->mmu_lock); |
339 | srcu_read_unlock(&kvm->srcu, idx); |
340 | |
341 | /* we've to flush the tlb before the pages can be freed */ |
342 | if (need_tlb_flush) |
343 | kvm_flush_remote_tlbs(kvm); |
344 | } |
345 | |
346 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, |
347 | struct mm_struct *mm, |
348 | unsigned long start, |
349 | unsigned long end) |
350 | { |
351 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
352 | |
353 | spin_lock(&kvm->mmu_lock); |
354 | /* |
355 | * This sequence increase will notify the kvm page fault that |
356 | * the page that is going to be mapped in the spte could have |
357 | * been freed. |
358 | */ |
359 | kvm->mmu_notifier_seq++; |
360 | /* |
361 | * The above sequence increase must be visible before the |
362 | * below count decrease but both values are read by the kvm |
363 | * page fault under mmu_lock spinlock so we don't need to add |
364 | * a smb_wmb() here in between the two. |
365 | */ |
366 | kvm->mmu_notifier_count--; |
367 | spin_unlock(&kvm->mmu_lock); |
368 | |
369 | BUG_ON(kvm->mmu_notifier_count < 0); |
370 | } |
371 | |
372 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, |
373 | struct mm_struct *mm, |
374 | unsigned long address) |
375 | { |
376 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
377 | int young, idx; |
378 | |
379 | idx = srcu_read_lock(&kvm->srcu); |
380 | spin_lock(&kvm->mmu_lock); |
381 | young = kvm_age_hva(kvm, address); |
382 | spin_unlock(&kvm->mmu_lock); |
383 | srcu_read_unlock(&kvm->srcu, idx); |
384 | |
385 | if (young) |
386 | kvm_flush_remote_tlbs(kvm); |
387 | |
388 | return young; |
389 | } |
390 | |
391 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
392 | struct mm_struct *mm, |
393 | unsigned long address) |
394 | { |
395 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
396 | int young, idx; |
397 | |
398 | idx = srcu_read_lock(&kvm->srcu); |
399 | spin_lock(&kvm->mmu_lock); |
400 | young = kvm_test_age_hva(kvm, address); |
401 | spin_unlock(&kvm->mmu_lock); |
402 | srcu_read_unlock(&kvm->srcu, idx); |
403 | |
404 | return young; |
405 | } |
406 | |
407 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
408 | struct mm_struct *mm) |
409 | { |
410 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
411 | int idx; |
412 | |
413 | idx = srcu_read_lock(&kvm->srcu); |
414 | kvm_arch_flush_shadow(kvm); |
415 | srcu_read_unlock(&kvm->srcu, idx); |
416 | } |
417 | |
418 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
419 | .invalidate_page = kvm_mmu_notifier_invalidate_page, |
420 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
421 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, |
422 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, |
423 | .test_young = kvm_mmu_notifier_test_young, |
424 | .change_pte = kvm_mmu_notifier_change_pte, |
425 | .release = kvm_mmu_notifier_release, |
426 | }; |
427 | |
428 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
429 | { |
430 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; |
431 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); |
432 | } |
433 | |
434 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ |
435 | |
436 | static int kvm_init_mmu_notifier(struct kvm *kvm) |
437 | { |
438 | return 0; |
439 | } |
440 | |
441 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
442 | |
443 | static void kvm_init_memslots_id(struct kvm *kvm) |
444 | { |
445 | int i; |
446 | struct kvm_memslots *slots = kvm->memslots; |
447 | |
448 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
449 | slots->id_to_index[i] = slots->memslots[i].id = i; |
450 | } |
451 | |
452 | static struct kvm *kvm_create_vm(void) |
453 | { |
454 | int r, i; |
455 | struct kvm *kvm = kvm_arch_alloc_vm(); |
456 | |
457 | if (!kvm) |
458 | return ERR_PTR(-ENOMEM); |
459 | |
460 | r = kvm_arch_init_vm(kvm); |
461 | if (r) |
462 | goto out_err_nodisable; |
463 | |
464 | r = hardware_enable_all(); |
465 | if (r) |
466 | goto out_err_nodisable; |
467 | |
468 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
469 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); |
470 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
471 | #endif |
472 | |
473 | r = -ENOMEM; |
474 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); |
475 | if (!kvm->memslots) |
476 | goto out_err_nosrcu; |
477 | kvm_init_memslots_id(kvm); |
478 | if (init_srcu_struct(&kvm->srcu)) |
479 | goto out_err_nosrcu; |
480 | for (i = 0; i < KVM_NR_BUSES; i++) { |
481 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), |
482 | GFP_KERNEL); |
483 | if (!kvm->buses[i]) |
484 | goto out_err; |
485 | } |
486 | |
487 | spin_lock_init(&kvm->mmu_lock); |
488 | kvm->mm = current->mm; |
489 | atomic_inc(&kvm->mm->mm_count); |
490 | kvm_eventfd_init(kvm); |
491 | mutex_init(&kvm->lock); |
492 | mutex_init(&kvm->irq_lock); |
493 | mutex_init(&kvm->slots_lock); |
494 | atomic_set(&kvm->users_count, 1); |
495 | |
496 | r = kvm_init_mmu_notifier(kvm); |
497 | if (r) |
498 | goto out_err; |
499 | |
500 | raw_spin_lock(&kvm_lock); |
501 | list_add(&kvm->vm_list, &vm_list); |
502 | raw_spin_unlock(&kvm_lock); |
503 | |
504 | return kvm; |
505 | |
506 | out_err: |
507 | cleanup_srcu_struct(&kvm->srcu); |
508 | out_err_nosrcu: |
509 | hardware_disable_all(); |
510 | out_err_nodisable: |
511 | for (i = 0; i < KVM_NR_BUSES; i++) |
512 | kfree(kvm->buses[i]); |
513 | kfree(kvm->memslots); |
514 | kvm_arch_free_vm(kvm); |
515 | return ERR_PTR(r); |
516 | } |
517 | |
518 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
519 | { |
520 | if (!memslot->dirty_bitmap) |
521 | return; |
522 | |
523 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
524 | vfree(memslot->dirty_bitmap_head); |
525 | else |
526 | kfree(memslot->dirty_bitmap_head); |
527 | |
528 | memslot->dirty_bitmap = NULL; |
529 | memslot->dirty_bitmap_head = NULL; |
530 | } |
531 | |
532 | /* |
533 | * Free any memory in @free but not in @dont. |
534 | */ |
535 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, |
536 | struct kvm_memory_slot *dont) |
537 | { |
538 | int i; |
539 | |
540 | if (!dont || free->rmap != dont->rmap) |
541 | vfree(free->rmap); |
542 | |
543 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
544 | kvm_destroy_dirty_bitmap(free); |
545 | |
546 | |
547 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
548 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { |
549 | vfree(free->lpage_info[i]); |
550 | free->lpage_info[i] = NULL; |
551 | } |
552 | } |
553 | |
554 | free->npages = 0; |
555 | free->rmap = NULL; |
556 | } |
557 | |
558 | void kvm_free_physmem(struct kvm *kvm) |
559 | { |
560 | struct kvm_memslots *slots = kvm->memslots; |
561 | struct kvm_memory_slot *memslot; |
562 | |
563 | kvm_for_each_memslot(memslot, slots) |
564 | kvm_free_physmem_slot(memslot, NULL); |
565 | |
566 | kfree(kvm->memslots); |
567 | } |
568 | |
569 | static void kvm_destroy_vm(struct kvm *kvm) |
570 | { |
571 | int i; |
572 | struct mm_struct *mm = kvm->mm; |
573 | |
574 | kvm_arch_sync_events(kvm); |
575 | raw_spin_lock(&kvm_lock); |
576 | list_del(&kvm->vm_list); |
577 | raw_spin_unlock(&kvm_lock); |
578 | kvm_free_irq_routing(kvm); |
579 | for (i = 0; i < KVM_NR_BUSES; i++) |
580 | kvm_io_bus_destroy(kvm->buses[i]); |
581 | kvm_coalesced_mmio_free(kvm); |
582 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
583 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); |
584 | #else |
585 | kvm_arch_flush_shadow(kvm); |
586 | #endif |
587 | kvm_arch_destroy_vm(kvm); |
588 | kvm_free_physmem(kvm); |
589 | cleanup_srcu_struct(&kvm->srcu); |
590 | kvm_arch_free_vm(kvm); |
591 | hardware_disable_all(); |
592 | mmdrop(mm); |
593 | } |
594 | |
595 | void kvm_get_kvm(struct kvm *kvm) |
596 | { |
597 | atomic_inc(&kvm->users_count); |
598 | } |
599 | EXPORT_SYMBOL_GPL(kvm_get_kvm); |
600 | |
601 | void kvm_put_kvm(struct kvm *kvm) |
602 | { |
603 | if (atomic_dec_and_test(&kvm->users_count)) |
604 | kvm_destroy_vm(kvm); |
605 | } |
606 | EXPORT_SYMBOL_GPL(kvm_put_kvm); |
607 | |
608 | |
609 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
610 | { |
611 | struct kvm *kvm = filp->private_data; |
612 | |
613 | kvm_irqfd_release(kvm); |
614 | |
615 | kvm_put_kvm(kvm); |
616 | return 0; |
617 | } |
618 | |
619 | #ifndef CONFIG_S390 |
620 | /* |
621 | * Allocation size is twice as large as the actual dirty bitmap size. |
622 | * This makes it possible to do double buffering: see x86's |
623 | * kvm_vm_ioctl_get_dirty_log(). |
624 | */ |
625 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
626 | { |
627 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
628 | |
629 | if (dirty_bytes > PAGE_SIZE) |
630 | memslot->dirty_bitmap = vzalloc(dirty_bytes); |
631 | else |
632 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); |
633 | |
634 | if (!memslot->dirty_bitmap) |
635 | return -ENOMEM; |
636 | |
637 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
638 | memslot->nr_dirty_pages = 0; |
639 | return 0; |
640 | } |
641 | #endif /* !CONFIG_S390 */ |
642 | |
643 | static struct kvm_memory_slot * |
644 | search_memslots(struct kvm_memslots *slots, gfn_t gfn) |
645 | { |
646 | struct kvm_memory_slot *memslot; |
647 | |
648 | kvm_for_each_memslot(memslot, slots) |
649 | if (gfn >= memslot->base_gfn && |
650 | gfn < memslot->base_gfn + memslot->npages) |
651 | return memslot; |
652 | |
653 | return NULL; |
654 | } |
655 | |
656 | static int cmp_memslot(const void *slot1, const void *slot2) |
657 | { |
658 | struct kvm_memory_slot *s1, *s2; |
659 | |
660 | s1 = (struct kvm_memory_slot *)slot1; |
661 | s2 = (struct kvm_memory_slot *)slot2; |
662 | |
663 | if (s1->npages < s2->npages) |
664 | return 1; |
665 | if (s1->npages > s2->npages) |
666 | return -1; |
667 | |
668 | return 0; |
669 | } |
670 | |
671 | /* |
672 | * Sort the memslots base on its size, so the larger slots |
673 | * will get better fit. |
674 | */ |
675 | static void sort_memslots(struct kvm_memslots *slots) |
676 | { |
677 | int i; |
678 | |
679 | sort(slots->memslots, KVM_MEM_SLOTS_NUM, |
680 | sizeof(struct kvm_memory_slot), cmp_memslot, NULL); |
681 | |
682 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
683 | slots->id_to_index[slots->memslots[i].id] = i; |
684 | } |
685 | |
686 | void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) |
687 | { |
688 | if (new) { |
689 | int id = new->id; |
690 | struct kvm_memory_slot *old = id_to_memslot(slots, id); |
691 | unsigned long npages = old->npages; |
692 | |
693 | *old = *new; |
694 | if (new->npages != npages) |
695 | sort_memslots(slots); |
696 | } |
697 | |
698 | slots->generation++; |
699 | } |
700 | |
701 | /* |
702 | * Allocate some memory and give it an address in the guest physical address |
703 | * space. |
704 | * |
705 | * Discontiguous memory is allowed, mostly for framebuffers. |
706 | * |
707 | * Must be called holding mmap_sem for write. |
708 | */ |
709 | int __kvm_set_memory_region(struct kvm *kvm, |
710 | struct kvm_userspace_memory_region *mem, |
711 | int user_alloc) |
712 | { |
713 | int r; |
714 | gfn_t base_gfn; |
715 | unsigned long npages; |
716 | unsigned long i; |
717 | struct kvm_memory_slot *memslot; |
718 | struct kvm_memory_slot old, new; |
719 | struct kvm_memslots *slots, *old_memslots; |
720 | |
721 | r = -EINVAL; |
722 | /* General sanity checks */ |
723 | if (mem->memory_size & (PAGE_SIZE - 1)) |
724 | goto out; |
725 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
726 | goto out; |
727 | /* We can read the guest memory with __xxx_user() later on. */ |
728 | if (user_alloc && |
729 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
730 | !access_ok(VERIFY_WRITE, |
731 | (void __user *)(unsigned long)mem->userspace_addr, |
732 | mem->memory_size))) |
733 | goto out; |
734 | if (mem->slot >= KVM_MEM_SLOTS_NUM) |
735 | goto out; |
736 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
737 | goto out; |
738 | |
739 | memslot = id_to_memslot(kvm->memslots, mem->slot); |
740 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
741 | npages = mem->memory_size >> PAGE_SHIFT; |
742 | |
743 | r = -EINVAL; |
744 | if (npages > KVM_MEM_MAX_NR_PAGES) |
745 | goto out; |
746 | |
747 | if (!npages) |
748 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; |
749 | |
750 | new = old = *memslot; |
751 | |
752 | new.id = mem->slot; |
753 | new.base_gfn = base_gfn; |
754 | new.npages = npages; |
755 | new.flags = mem->flags; |
756 | |
757 | /* Disallow changing a memory slot's size. */ |
758 | r = -EINVAL; |
759 | if (npages && old.npages && npages != old.npages) |
760 | goto out_free; |
761 | |
762 | /* Check for overlaps */ |
763 | r = -EEXIST; |
764 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
765 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
766 | |
767 | if (s == memslot || !s->npages) |
768 | continue; |
769 | if (!((base_gfn + npages <= s->base_gfn) || |
770 | (base_gfn >= s->base_gfn + s->npages))) |
771 | goto out_free; |
772 | } |
773 | |
774 | /* Free page dirty bitmap if unneeded */ |
775 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) |
776 | new.dirty_bitmap = NULL; |
777 | |
778 | r = -ENOMEM; |
779 | |
780 | /* Allocate if a slot is being created */ |
781 | #ifndef CONFIG_S390 |
782 | if (npages && !new.rmap) { |
783 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
784 | |
785 | if (!new.rmap) |
786 | goto out_free; |
787 | |
788 | new.user_alloc = user_alloc; |
789 | new.userspace_addr = mem->userspace_addr; |
790 | } |
791 | if (!npages) |
792 | goto skip_lpage; |
793 | |
794 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
795 | unsigned long ugfn; |
796 | unsigned long j; |
797 | int lpages; |
798 | int level = i + 2; |
799 | |
800 | /* Avoid unused variable warning if no large pages */ |
801 | (void)level; |
802 | |
803 | if (new.lpage_info[i]) |
804 | continue; |
805 | |
806 | lpages = 1 + ((base_gfn + npages - 1) |
807 | >> KVM_HPAGE_GFN_SHIFT(level)); |
808 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); |
809 | |
810 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
811 | |
812 | if (!new.lpage_info[i]) |
813 | goto out_free; |
814 | |
815 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
816 | new.lpage_info[i][0].write_count = 1; |
817 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
818 | new.lpage_info[i][lpages - 1].write_count = 1; |
819 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
820 | /* |
821 | * If the gfn and userspace address are not aligned wrt each |
822 | * other, or if explicitly asked to, disable large page |
823 | * support for this slot |
824 | */ |
825 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
826 | !largepages_enabled) |
827 | for (j = 0; j < lpages; ++j) |
828 | new.lpage_info[i][j].write_count = 1; |
829 | } |
830 | |
831 | skip_lpage: |
832 | |
833 | /* Allocate page dirty bitmap if needed */ |
834 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { |
835 | if (kvm_create_dirty_bitmap(&new) < 0) |
836 | goto out_free; |
837 | /* destroy any largepage mappings for dirty tracking */ |
838 | } |
839 | #else /* not defined CONFIG_S390 */ |
840 | new.user_alloc = user_alloc; |
841 | if (user_alloc) |
842 | new.userspace_addr = mem->userspace_addr; |
843 | #endif /* not defined CONFIG_S390 */ |
844 | |
845 | if (!npages) { |
846 | struct kvm_memory_slot *slot; |
847 | |
848 | r = -ENOMEM; |
849 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
850 | GFP_KERNEL); |
851 | if (!slots) |
852 | goto out_free; |
853 | slot = id_to_memslot(slots, mem->slot); |
854 | slot->flags |= KVM_MEMSLOT_INVALID; |
855 | |
856 | update_memslots(slots, NULL); |
857 | |
858 | old_memslots = kvm->memslots; |
859 | rcu_assign_pointer(kvm->memslots, slots); |
860 | synchronize_srcu_expedited(&kvm->srcu); |
861 | /* From this point no new shadow pages pointing to a deleted |
862 | * memslot will be created. |
863 | * |
864 | * validation of sp->gfn happens in: |
865 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
866 | * - kvm_is_visible_gfn (mmu_check_roots) |
867 | */ |
868 | kvm_arch_flush_shadow(kvm); |
869 | kfree(old_memslots); |
870 | } |
871 | |
872 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
873 | if (r) |
874 | goto out_free; |
875 | |
876 | /* map the pages in iommu page table */ |
877 | if (npages) { |
878 | r = kvm_iommu_map_pages(kvm, &new); |
879 | if (r) |
880 | goto out_free; |
881 | } |
882 | |
883 | r = -ENOMEM; |
884 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
885 | GFP_KERNEL); |
886 | if (!slots) |
887 | goto out_free; |
888 | |
889 | /* actual memory is freed via old in kvm_free_physmem_slot below */ |
890 | if (!npages) { |
891 | new.rmap = NULL; |
892 | new.dirty_bitmap = NULL; |
893 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) |
894 | new.lpage_info[i] = NULL; |
895 | } |
896 | |
897 | update_memslots(slots, &new); |
898 | old_memslots = kvm->memslots; |
899 | rcu_assign_pointer(kvm->memslots, slots); |
900 | synchronize_srcu_expedited(&kvm->srcu); |
901 | |
902 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
903 | |
904 | /* |
905 | * If the new memory slot is created, we need to clear all |
906 | * mmio sptes. |
907 | */ |
908 | if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) |
909 | kvm_arch_flush_shadow(kvm); |
910 | |
911 | kvm_free_physmem_slot(&old, &new); |
912 | kfree(old_memslots); |
913 | |
914 | return 0; |
915 | |
916 | out_free: |
917 | kvm_free_physmem_slot(&new, &old); |
918 | out: |
919 | return r; |
920 | |
921 | } |
922 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
923 | |
924 | int kvm_set_memory_region(struct kvm *kvm, |
925 | struct kvm_userspace_memory_region *mem, |
926 | int user_alloc) |
927 | { |
928 | int r; |
929 | |
930 | mutex_lock(&kvm->slots_lock); |
931 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
932 | mutex_unlock(&kvm->slots_lock); |
933 | return r; |
934 | } |
935 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
936 | |
937 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
938 | struct |
939 | kvm_userspace_memory_region *mem, |
940 | int user_alloc) |
941 | { |
942 | if (mem->slot >= KVM_MEMORY_SLOTS) |
943 | return -EINVAL; |
944 | return kvm_set_memory_region(kvm, mem, user_alloc); |
945 | } |
946 | |
947 | int kvm_get_dirty_log(struct kvm *kvm, |
948 | struct kvm_dirty_log *log, int *is_dirty) |
949 | { |
950 | struct kvm_memory_slot *memslot; |
951 | int r, i; |
952 | unsigned long n; |
953 | unsigned long any = 0; |
954 | |
955 | r = -EINVAL; |
956 | if (log->slot >= KVM_MEMORY_SLOTS) |
957 | goto out; |
958 | |
959 | memslot = id_to_memslot(kvm->memslots, log->slot); |
960 | r = -ENOENT; |
961 | if (!memslot->dirty_bitmap) |
962 | goto out; |
963 | |
964 | n = kvm_dirty_bitmap_bytes(memslot); |
965 | |
966 | for (i = 0; !any && i < n/sizeof(long); ++i) |
967 | any = memslot->dirty_bitmap[i]; |
968 | |
969 | r = -EFAULT; |
970 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
971 | goto out; |
972 | |
973 | if (any) |
974 | *is_dirty = 1; |
975 | |
976 | r = 0; |
977 | out: |
978 | return r; |
979 | } |
980 | |
981 | void kvm_disable_largepages(void) |
982 | { |
983 | largepages_enabled = false; |
984 | } |
985 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); |
986 | |
987 | int is_error_page(struct page *page) |
988 | { |
989 | return page == bad_page || page == hwpoison_page || page == fault_page; |
990 | } |
991 | EXPORT_SYMBOL_GPL(is_error_page); |
992 | |
993 | int is_error_pfn(pfn_t pfn) |
994 | { |
995 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
996 | } |
997 | EXPORT_SYMBOL_GPL(is_error_pfn); |
998 | |
999 | int is_hwpoison_pfn(pfn_t pfn) |
1000 | { |
1001 | return pfn == hwpoison_pfn; |
1002 | } |
1003 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); |
1004 | |
1005 | int is_fault_pfn(pfn_t pfn) |
1006 | { |
1007 | return pfn == fault_pfn; |
1008 | } |
1009 | EXPORT_SYMBOL_GPL(is_fault_pfn); |
1010 | |
1011 | int is_noslot_pfn(pfn_t pfn) |
1012 | { |
1013 | return pfn == bad_pfn; |
1014 | } |
1015 | EXPORT_SYMBOL_GPL(is_noslot_pfn); |
1016 | |
1017 | int is_invalid_pfn(pfn_t pfn) |
1018 | { |
1019 | return pfn == hwpoison_pfn || pfn == fault_pfn; |
1020 | } |
1021 | EXPORT_SYMBOL_GPL(is_invalid_pfn); |
1022 | |
1023 | static inline unsigned long bad_hva(void) |
1024 | { |
1025 | return PAGE_OFFSET; |
1026 | } |
1027 | |
1028 | int kvm_is_error_hva(unsigned long addr) |
1029 | { |
1030 | return addr == bad_hva(); |
1031 | } |
1032 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); |
1033 | |
1034 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
1035 | gfn_t gfn) |
1036 | { |
1037 | return search_memslots(slots, gfn); |
1038 | } |
1039 | |
1040 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1041 | { |
1042 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); |
1043 | } |
1044 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
1045 | |
1046 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
1047 | { |
1048 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
1049 | |
1050 | if (!memslot || memslot->id >= KVM_MEMORY_SLOTS || |
1051 | memslot->flags & KVM_MEMSLOT_INVALID) |
1052 | return 0; |
1053 | |
1054 | return 1; |
1055 | } |
1056 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); |
1057 | |
1058 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1059 | { |
1060 | struct vm_area_struct *vma; |
1061 | unsigned long addr, size; |
1062 | |
1063 | size = PAGE_SIZE; |
1064 | |
1065 | addr = gfn_to_hva(kvm, gfn); |
1066 | if (kvm_is_error_hva(addr)) |
1067 | return PAGE_SIZE; |
1068 | |
1069 | down_read(¤t->mm->mmap_sem); |
1070 | vma = find_vma(current->mm, addr); |
1071 | if (!vma) |
1072 | goto out; |
1073 | |
1074 | size = vma_kernel_pagesize(vma); |
1075 | |
1076 | out: |
1077 | up_read(¤t->mm->mmap_sem); |
1078 | |
1079 | return size; |
1080 | } |
1081 | |
1082 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1083 | gfn_t *nr_pages) |
1084 | { |
1085 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
1086 | return bad_hva(); |
1087 | |
1088 | if (nr_pages) |
1089 | *nr_pages = slot->npages - (gfn - slot->base_gfn); |
1090 | |
1091 | return gfn_to_hva_memslot(slot, gfn); |
1092 | } |
1093 | |
1094 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1095 | { |
1096 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
1097 | } |
1098 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
1099 | |
1100 | static pfn_t get_fault_pfn(void) |
1101 | { |
1102 | get_page(fault_page); |
1103 | return fault_pfn; |
1104 | } |
1105 | |
1106 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1107 | unsigned long start, int write, struct page **page) |
1108 | { |
1109 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; |
1110 | |
1111 | if (write) |
1112 | flags |= FOLL_WRITE; |
1113 | |
1114 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); |
1115 | } |
1116 | |
1117 | static inline int check_user_page_hwpoison(unsigned long addr) |
1118 | { |
1119 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; |
1120 | |
1121 | rc = __get_user_pages(current, current->mm, addr, 1, |
1122 | flags, NULL, NULL, NULL); |
1123 | return rc == -EHWPOISON; |
1124 | } |
1125 | |
1126 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
1127 | bool *async, bool write_fault, bool *writable) |
1128 | { |
1129 | struct page *page[1]; |
1130 | int npages = 0; |
1131 | pfn_t pfn; |
1132 | |
1133 | /* we can do it either atomically or asynchronously, not both */ |
1134 | BUG_ON(atomic && async); |
1135 | |
1136 | BUG_ON(!write_fault && !writable); |
1137 | |
1138 | if (writable) |
1139 | *writable = true; |
1140 | |
1141 | if (atomic || async) |
1142 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1143 | |
1144 | if (unlikely(npages != 1) && !atomic) { |
1145 | might_sleep(); |
1146 | |
1147 | if (writable) |
1148 | *writable = write_fault; |
1149 | |
1150 | if (async) { |
1151 | down_read(¤t->mm->mmap_sem); |
1152 | npages = get_user_page_nowait(current, current->mm, |
1153 | addr, write_fault, page); |
1154 | up_read(¤t->mm->mmap_sem); |
1155 | } else |
1156 | npages = get_user_pages_fast(addr, 1, write_fault, |
1157 | page); |
1158 | |
1159 | /* map read fault as writable if possible */ |
1160 | if (unlikely(!write_fault) && npages == 1) { |
1161 | struct page *wpage[1]; |
1162 | |
1163 | npages = __get_user_pages_fast(addr, 1, 1, wpage); |
1164 | if (npages == 1) { |
1165 | *writable = true; |
1166 | put_page(page[0]); |
1167 | page[0] = wpage[0]; |
1168 | } |
1169 | npages = 1; |
1170 | } |
1171 | } |
1172 | |
1173 | if (unlikely(npages != 1)) { |
1174 | struct vm_area_struct *vma; |
1175 | |
1176 | if (atomic) |
1177 | return get_fault_pfn(); |
1178 | |
1179 | down_read(¤t->mm->mmap_sem); |
1180 | if (npages == -EHWPOISON || |
1181 | (!async && check_user_page_hwpoison(addr))) { |
1182 | up_read(¤t->mm->mmap_sem); |
1183 | get_page(hwpoison_page); |
1184 | return page_to_pfn(hwpoison_page); |
1185 | } |
1186 | |
1187 | vma = find_vma_intersection(current->mm, addr, addr+1); |
1188 | |
1189 | if (vma == NULL) |
1190 | pfn = get_fault_pfn(); |
1191 | else if ((vma->vm_flags & VM_PFNMAP)) { |
1192 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + |
1193 | vma->vm_pgoff; |
1194 | BUG_ON(!kvm_is_mmio_pfn(pfn)); |
1195 | } else { |
1196 | if (async && (vma->vm_flags & VM_WRITE)) |
1197 | *async = true; |
1198 | pfn = get_fault_pfn(); |
1199 | } |
1200 | up_read(¤t->mm->mmap_sem); |
1201 | } else |
1202 | pfn = page_to_pfn(page[0]); |
1203 | |
1204 | return pfn; |
1205 | } |
1206 | |
1207 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1208 | { |
1209 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
1210 | } |
1211 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); |
1212 | |
1213 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1214 | bool write_fault, bool *writable) |
1215 | { |
1216 | unsigned long addr; |
1217 | |
1218 | if (async) |
1219 | *async = false; |
1220 | |
1221 | addr = gfn_to_hva(kvm, gfn); |
1222 | if (kvm_is_error_hva(addr)) { |
1223 | get_page(bad_page); |
1224 | return page_to_pfn(bad_page); |
1225 | } |
1226 | |
1227 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
1228 | } |
1229 | |
1230 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
1231 | { |
1232 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
1233 | } |
1234 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); |
1235 | |
1236 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1237 | bool write_fault, bool *writable) |
1238 | { |
1239 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
1240 | } |
1241 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); |
1242 | |
1243 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1244 | { |
1245 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
1246 | } |
1247 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1248 | |
1249 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1250 | bool *writable) |
1251 | { |
1252 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); |
1253 | } |
1254 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); |
1255 | |
1256 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1257 | struct kvm_memory_slot *slot, gfn_t gfn) |
1258 | { |
1259 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); |
1260 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
1261 | } |
1262 | |
1263 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1264 | int nr_pages) |
1265 | { |
1266 | unsigned long addr; |
1267 | gfn_t entry; |
1268 | |
1269 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
1270 | if (kvm_is_error_hva(addr)) |
1271 | return -1; |
1272 | |
1273 | if (entry < nr_pages) |
1274 | return 0; |
1275 | |
1276 | return __get_user_pages_fast(addr, nr_pages, 1, pages); |
1277 | } |
1278 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); |
1279 | |
1280 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1281 | { |
1282 | pfn_t pfn; |
1283 | |
1284 | pfn = gfn_to_pfn(kvm, gfn); |
1285 | if (!kvm_is_mmio_pfn(pfn)) |
1286 | return pfn_to_page(pfn); |
1287 | |
1288 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
1289 | |
1290 | get_page(bad_page); |
1291 | return bad_page; |
1292 | } |
1293 | |
1294 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1295 | |
1296 | void kvm_release_page_clean(struct page *page) |
1297 | { |
1298 | kvm_release_pfn_clean(page_to_pfn(page)); |
1299 | } |
1300 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); |
1301 | |
1302 | void kvm_release_pfn_clean(pfn_t pfn) |
1303 | { |
1304 | if (!kvm_is_mmio_pfn(pfn)) |
1305 | put_page(pfn_to_page(pfn)); |
1306 | } |
1307 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); |
1308 | |
1309 | void kvm_release_page_dirty(struct page *page) |
1310 | { |
1311 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1312 | } |
1313 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); |
1314 | |
1315 | void kvm_release_pfn_dirty(pfn_t pfn) |
1316 | { |
1317 | kvm_set_pfn_dirty(pfn); |
1318 | kvm_release_pfn_clean(pfn); |
1319 | } |
1320 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
1321 | |
1322 | void kvm_set_page_dirty(struct page *page) |
1323 | { |
1324 | kvm_set_pfn_dirty(page_to_pfn(page)); |
1325 | } |
1326 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); |
1327 | |
1328 | void kvm_set_pfn_dirty(pfn_t pfn) |
1329 | { |
1330 | if (!kvm_is_mmio_pfn(pfn)) { |
1331 | struct page *page = pfn_to_page(pfn); |
1332 | if (!PageReserved(page)) |
1333 | SetPageDirty(page); |
1334 | } |
1335 | } |
1336 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1337 | |
1338 | void kvm_set_pfn_accessed(pfn_t pfn) |
1339 | { |
1340 | if (!kvm_is_mmio_pfn(pfn)) |
1341 | mark_page_accessed(pfn_to_page(pfn)); |
1342 | } |
1343 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); |
1344 | |
1345 | void kvm_get_pfn(pfn_t pfn) |
1346 | { |
1347 | if (!kvm_is_mmio_pfn(pfn)) |
1348 | get_page(pfn_to_page(pfn)); |
1349 | } |
1350 | EXPORT_SYMBOL_GPL(kvm_get_pfn); |
1351 | |
1352 | static int next_segment(unsigned long len, int offset) |
1353 | { |
1354 | if (len > PAGE_SIZE - offset) |
1355 | return PAGE_SIZE - offset; |
1356 | else |
1357 | return len; |
1358 | } |
1359 | |
1360 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, |
1361 | int len) |
1362 | { |
1363 | int r; |
1364 | unsigned long addr; |
1365 | |
1366 | addr = gfn_to_hva(kvm, gfn); |
1367 | if (kvm_is_error_hva(addr)) |
1368 | return -EFAULT; |
1369 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
1370 | if (r) |
1371 | return -EFAULT; |
1372 | return 0; |
1373 | } |
1374 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1375 | |
1376 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1377 | { |
1378 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1379 | int seg; |
1380 | int offset = offset_in_page(gpa); |
1381 | int ret; |
1382 | |
1383 | while ((seg = next_segment(len, offset)) != 0) { |
1384 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); |
1385 | if (ret < 0) |
1386 | return ret; |
1387 | offset = 0; |
1388 | len -= seg; |
1389 | data += seg; |
1390 | ++gfn; |
1391 | } |
1392 | return 0; |
1393 | } |
1394 | EXPORT_SYMBOL_GPL(kvm_read_guest); |
1395 | |
1396 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1397 | unsigned long len) |
1398 | { |
1399 | int r; |
1400 | unsigned long addr; |
1401 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1402 | int offset = offset_in_page(gpa); |
1403 | |
1404 | addr = gfn_to_hva(kvm, gfn); |
1405 | if (kvm_is_error_hva(addr)) |
1406 | return -EFAULT; |
1407 | pagefault_disable(); |
1408 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
1409 | pagefault_enable(); |
1410 | if (r) |
1411 | return -EFAULT; |
1412 | return 0; |
1413 | } |
1414 | EXPORT_SYMBOL(kvm_read_guest_atomic); |
1415 | |
1416 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1417 | int offset, int len) |
1418 | { |
1419 | int r; |
1420 | unsigned long addr; |
1421 | |
1422 | addr = gfn_to_hva(kvm, gfn); |
1423 | if (kvm_is_error_hva(addr)) |
1424 | return -EFAULT; |
1425 | r = __copy_to_user((void __user *)addr + offset, data, len); |
1426 | if (r) |
1427 | return -EFAULT; |
1428 | mark_page_dirty(kvm, gfn); |
1429 | return 0; |
1430 | } |
1431 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
1432 | |
1433 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
1434 | unsigned long len) |
1435 | { |
1436 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1437 | int seg; |
1438 | int offset = offset_in_page(gpa); |
1439 | int ret; |
1440 | |
1441 | while ((seg = next_segment(len, offset)) != 0) { |
1442 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); |
1443 | if (ret < 0) |
1444 | return ret; |
1445 | offset = 0; |
1446 | len -= seg; |
1447 | data += seg; |
1448 | ++gfn; |
1449 | } |
1450 | return 0; |
1451 | } |
1452 | |
1453 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1454 | gpa_t gpa) |
1455 | { |
1456 | struct kvm_memslots *slots = kvm_memslots(kvm); |
1457 | int offset = offset_in_page(gpa); |
1458 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1459 | |
1460 | ghc->gpa = gpa; |
1461 | ghc->generation = slots->generation; |
1462 | ghc->memslot = __gfn_to_memslot(slots, gfn); |
1463 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); |
1464 | if (!kvm_is_error_hva(ghc->hva)) |
1465 | ghc->hva += offset; |
1466 | else |
1467 | return -EFAULT; |
1468 | |
1469 | return 0; |
1470 | } |
1471 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
1472 | |
1473 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1474 | void *data, unsigned long len) |
1475 | { |
1476 | struct kvm_memslots *slots = kvm_memslots(kvm); |
1477 | int r; |
1478 | |
1479 | if (slots->generation != ghc->generation) |
1480 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); |
1481 | |
1482 | if (kvm_is_error_hva(ghc->hva)) |
1483 | return -EFAULT; |
1484 | |
1485 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
1486 | if (r) |
1487 | return -EFAULT; |
1488 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); |
1489 | |
1490 | return 0; |
1491 | } |
1492 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
1493 | |
1494 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1495 | void *data, unsigned long len) |
1496 | { |
1497 | struct kvm_memslots *slots = kvm_memslots(kvm); |
1498 | int r; |
1499 | |
1500 | if (slots->generation != ghc->generation) |
1501 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); |
1502 | |
1503 | if (kvm_is_error_hva(ghc->hva)) |
1504 | return -EFAULT; |
1505 | |
1506 | r = __copy_from_user(data, (void __user *)ghc->hva, len); |
1507 | if (r) |
1508 | return -EFAULT; |
1509 | |
1510 | return 0; |
1511 | } |
1512 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
1513 | |
1514 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1515 | { |
1516 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1517 | offset, len); |
1518 | } |
1519 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); |
1520 | |
1521 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) |
1522 | { |
1523 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1524 | int seg; |
1525 | int offset = offset_in_page(gpa); |
1526 | int ret; |
1527 | |
1528 | while ((seg = next_segment(len, offset)) != 0) { |
1529 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
1530 | if (ret < 0) |
1531 | return ret; |
1532 | offset = 0; |
1533 | len -= seg; |
1534 | ++gfn; |
1535 | } |
1536 | return 0; |
1537 | } |
1538 | EXPORT_SYMBOL_GPL(kvm_clear_guest); |
1539 | |
1540 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1541 | gfn_t gfn) |
1542 | { |
1543 | if (memslot && memslot->dirty_bitmap) { |
1544 | unsigned long rel_gfn = gfn - memslot->base_gfn; |
1545 | |
1546 | if (!test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap)) |
1547 | memslot->nr_dirty_pages++; |
1548 | } |
1549 | } |
1550 | |
1551 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1552 | { |
1553 | struct kvm_memory_slot *memslot; |
1554 | |
1555 | memslot = gfn_to_memslot(kvm, gfn); |
1556 | mark_page_dirty_in_slot(kvm, memslot, gfn); |
1557 | } |
1558 | |
1559 | /* |
1560 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. |
1561 | */ |
1562 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
1563 | { |
1564 | DEFINE_WAIT(wait); |
1565 | |
1566 | for (;;) { |
1567 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
1568 | |
1569 | if (kvm_arch_vcpu_runnable(vcpu)) { |
1570 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
1571 | break; |
1572 | } |
1573 | if (kvm_cpu_has_pending_timer(vcpu)) |
1574 | break; |
1575 | if (signal_pending(current)) |
1576 | break; |
1577 | |
1578 | schedule(); |
1579 | } |
1580 | |
1581 | finish_wait(&vcpu->wq, &wait); |
1582 | } |
1583 | |
1584 | void kvm_resched(struct kvm_vcpu *vcpu) |
1585 | { |
1586 | if (!need_resched()) |
1587 | return; |
1588 | cond_resched(); |
1589 | } |
1590 | EXPORT_SYMBOL_GPL(kvm_resched); |
1591 | |
1592 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
1593 | { |
1594 | struct kvm *kvm = me->kvm; |
1595 | struct kvm_vcpu *vcpu; |
1596 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; |
1597 | int yielded = 0; |
1598 | int pass; |
1599 | int i; |
1600 | |
1601 | /* |
1602 | * We boost the priority of a VCPU that is runnable but not |
1603 | * currently running, because it got preempted by something |
1604 | * else and called schedule in __vcpu_run. Hopefully that |
1605 | * VCPU is holding the lock that we need and will release it. |
1606 | * We approximate round-robin by starting at the last boosted VCPU. |
1607 | */ |
1608 | for (pass = 0; pass < 2 && !yielded; pass++) { |
1609 | kvm_for_each_vcpu(i, vcpu, kvm) { |
1610 | struct task_struct *task = NULL; |
1611 | struct pid *pid; |
1612 | if (!pass && i < last_boosted_vcpu) { |
1613 | i = last_boosted_vcpu; |
1614 | continue; |
1615 | } else if (pass && i > last_boosted_vcpu) |
1616 | break; |
1617 | if (vcpu == me) |
1618 | continue; |
1619 | if (waitqueue_active(&vcpu->wq)) |
1620 | continue; |
1621 | rcu_read_lock(); |
1622 | pid = rcu_dereference(vcpu->pid); |
1623 | if (pid) |
1624 | task = get_pid_task(vcpu->pid, PIDTYPE_PID); |
1625 | rcu_read_unlock(); |
1626 | if (!task) |
1627 | continue; |
1628 | if (task->flags & PF_VCPU) { |
1629 | put_task_struct(task); |
1630 | continue; |
1631 | } |
1632 | if (yield_to(task, 1)) { |
1633 | put_task_struct(task); |
1634 | kvm->last_boosted_vcpu = i; |
1635 | yielded = 1; |
1636 | break; |
1637 | } |
1638 | put_task_struct(task); |
1639 | } |
1640 | } |
1641 | } |
1642 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); |
1643 | |
1644 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1645 | { |
1646 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; |
1647 | struct page *page; |
1648 | |
1649 | if (vmf->pgoff == 0) |
1650 | page = virt_to_page(vcpu->run); |
1651 | #ifdef CONFIG_X86 |
1652 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
1653 | page = virt_to_page(vcpu->arch.pio_data); |
1654 | #endif |
1655 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1656 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
1657 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); |
1658 | #endif |
1659 | else |
1660 | return VM_FAULT_SIGBUS; |
1661 | get_page(page); |
1662 | vmf->page = page; |
1663 | return 0; |
1664 | } |
1665 | |
1666 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
1667 | .fault = kvm_vcpu_fault, |
1668 | }; |
1669 | |
1670 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) |
1671 | { |
1672 | vma->vm_ops = &kvm_vcpu_vm_ops; |
1673 | return 0; |
1674 | } |
1675 | |
1676 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1677 | { |
1678 | struct kvm_vcpu *vcpu = filp->private_data; |
1679 | |
1680 | kvm_put_kvm(vcpu->kvm); |
1681 | return 0; |
1682 | } |
1683 | |
1684 | static struct file_operations kvm_vcpu_fops = { |
1685 | .release = kvm_vcpu_release, |
1686 | .unlocked_ioctl = kvm_vcpu_ioctl, |
1687 | #ifdef CONFIG_COMPAT |
1688 | .compat_ioctl = kvm_vcpu_compat_ioctl, |
1689 | #endif |
1690 | .mmap = kvm_vcpu_mmap, |
1691 | .llseek = noop_llseek, |
1692 | }; |
1693 | |
1694 | /* |
1695 | * Allocates an inode for the vcpu. |
1696 | */ |
1697 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) |
1698 | { |
1699 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
1700 | } |
1701 | |
1702 | /* |
1703 | * Creates some virtual cpus. Good luck creating more than one. |
1704 | */ |
1705 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
1706 | { |
1707 | int r; |
1708 | struct kvm_vcpu *vcpu, *v; |
1709 | |
1710 | vcpu = kvm_arch_vcpu_create(kvm, id); |
1711 | if (IS_ERR(vcpu)) |
1712 | return PTR_ERR(vcpu); |
1713 | |
1714 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1715 | |
1716 | r = kvm_arch_vcpu_setup(vcpu); |
1717 | if (r) |
1718 | goto vcpu_destroy; |
1719 | |
1720 | mutex_lock(&kvm->lock); |
1721 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1722 | r = -EINVAL; |
1723 | goto unlock_vcpu_destroy; |
1724 | } |
1725 | |
1726 | kvm_for_each_vcpu(r, v, kvm) |
1727 | if (v->vcpu_id == id) { |
1728 | r = -EEXIST; |
1729 | goto unlock_vcpu_destroy; |
1730 | } |
1731 | |
1732 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); |
1733 | |
1734 | /* Now it's all set up, let userspace reach it */ |
1735 | kvm_get_kvm(kvm); |
1736 | r = create_vcpu_fd(vcpu); |
1737 | if (r < 0) { |
1738 | kvm_put_kvm(kvm); |
1739 | goto unlock_vcpu_destroy; |
1740 | } |
1741 | |
1742 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; |
1743 | smp_wmb(); |
1744 | atomic_inc(&kvm->online_vcpus); |
1745 | |
1746 | mutex_unlock(&kvm->lock); |
1747 | return r; |
1748 | |
1749 | unlock_vcpu_destroy: |
1750 | mutex_unlock(&kvm->lock); |
1751 | vcpu_destroy: |
1752 | kvm_arch_vcpu_destroy(vcpu); |
1753 | return r; |
1754 | } |
1755 | |
1756 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1757 | { |
1758 | if (sigset) { |
1759 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1760 | vcpu->sigset_active = 1; |
1761 | vcpu->sigset = *sigset; |
1762 | } else |
1763 | vcpu->sigset_active = 0; |
1764 | return 0; |
1765 | } |
1766 | |
1767 | static long kvm_vcpu_ioctl(struct file *filp, |
1768 | unsigned int ioctl, unsigned long arg) |
1769 | { |
1770 | struct kvm_vcpu *vcpu = filp->private_data; |
1771 | void __user *argp = (void __user *)arg; |
1772 | int r; |
1773 | struct kvm_fpu *fpu = NULL; |
1774 | struct kvm_sregs *kvm_sregs = NULL; |
1775 | |
1776 | if (vcpu->kvm->mm != current->mm) |
1777 | return -EIO; |
1778 | |
1779 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) |
1780 | /* |
1781 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, |
1782 | * so vcpu_load() would break it. |
1783 | */ |
1784 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) |
1785 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
1786 | #endif |
1787 | |
1788 | |
1789 | vcpu_load(vcpu); |
1790 | switch (ioctl) { |
1791 | case KVM_RUN: |
1792 | r = -EINVAL; |
1793 | if (arg) |
1794 | goto out; |
1795 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
1796 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
1797 | break; |
1798 | case KVM_GET_REGS: { |
1799 | struct kvm_regs *kvm_regs; |
1800 | |
1801 | r = -ENOMEM; |
1802 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); |
1803 | if (!kvm_regs) |
1804 | goto out; |
1805 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1806 | if (r) |
1807 | goto out_free1; |
1808 | r = -EFAULT; |
1809 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1810 | goto out_free1; |
1811 | r = 0; |
1812 | out_free1: |
1813 | kfree(kvm_regs); |
1814 | break; |
1815 | } |
1816 | case KVM_SET_REGS: { |
1817 | struct kvm_regs *kvm_regs; |
1818 | |
1819 | r = -ENOMEM; |
1820 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
1821 | if (IS_ERR(kvm_regs)) { |
1822 | r = PTR_ERR(kvm_regs); |
1823 | goto out; |
1824 | } |
1825 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
1826 | if (r) |
1827 | goto out_free2; |
1828 | r = 0; |
1829 | out_free2: |
1830 | kfree(kvm_regs); |
1831 | break; |
1832 | } |
1833 | case KVM_GET_SREGS: { |
1834 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1835 | r = -ENOMEM; |
1836 | if (!kvm_sregs) |
1837 | goto out; |
1838 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); |
1839 | if (r) |
1840 | goto out; |
1841 | r = -EFAULT; |
1842 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
1843 | goto out; |
1844 | r = 0; |
1845 | break; |
1846 | } |
1847 | case KVM_SET_SREGS: { |
1848 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
1849 | if (IS_ERR(kvm_sregs)) { |
1850 | r = PTR_ERR(kvm_sregs); |
1851 | goto out; |
1852 | } |
1853 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
1854 | if (r) |
1855 | goto out; |
1856 | r = 0; |
1857 | break; |
1858 | } |
1859 | case KVM_GET_MP_STATE: { |
1860 | struct kvm_mp_state mp_state; |
1861 | |
1862 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); |
1863 | if (r) |
1864 | goto out; |
1865 | r = -EFAULT; |
1866 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) |
1867 | goto out; |
1868 | r = 0; |
1869 | break; |
1870 | } |
1871 | case KVM_SET_MP_STATE: { |
1872 | struct kvm_mp_state mp_state; |
1873 | |
1874 | r = -EFAULT; |
1875 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) |
1876 | goto out; |
1877 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); |
1878 | if (r) |
1879 | goto out; |
1880 | r = 0; |
1881 | break; |
1882 | } |
1883 | case KVM_TRANSLATE: { |
1884 | struct kvm_translation tr; |
1885 | |
1886 | r = -EFAULT; |
1887 | if (copy_from_user(&tr, argp, sizeof tr)) |
1888 | goto out; |
1889 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
1890 | if (r) |
1891 | goto out; |
1892 | r = -EFAULT; |
1893 | if (copy_to_user(argp, &tr, sizeof tr)) |
1894 | goto out; |
1895 | r = 0; |
1896 | break; |
1897 | } |
1898 | case KVM_SET_GUEST_DEBUG: { |
1899 | struct kvm_guest_debug dbg; |
1900 | |
1901 | r = -EFAULT; |
1902 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
1903 | goto out; |
1904 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
1905 | if (r) |
1906 | goto out; |
1907 | r = 0; |
1908 | break; |
1909 | } |
1910 | case KVM_SET_SIGNAL_MASK: { |
1911 | struct kvm_signal_mask __user *sigmask_arg = argp; |
1912 | struct kvm_signal_mask kvm_sigmask; |
1913 | sigset_t sigset, *p; |
1914 | |
1915 | p = NULL; |
1916 | if (argp) { |
1917 | r = -EFAULT; |
1918 | if (copy_from_user(&kvm_sigmask, argp, |
1919 | sizeof kvm_sigmask)) |
1920 | goto out; |
1921 | r = -EINVAL; |
1922 | if (kvm_sigmask.len != sizeof sigset) |
1923 | goto out; |
1924 | r = -EFAULT; |
1925 | if (copy_from_user(&sigset, sigmask_arg->sigset, |
1926 | sizeof sigset)) |
1927 | goto out; |
1928 | p = &sigset; |
1929 | } |
1930 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1931 | break; |
1932 | } |
1933 | case KVM_GET_FPU: { |
1934 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1935 | r = -ENOMEM; |
1936 | if (!fpu) |
1937 | goto out; |
1938 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); |
1939 | if (r) |
1940 | goto out; |
1941 | r = -EFAULT; |
1942 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
1943 | goto out; |
1944 | r = 0; |
1945 | break; |
1946 | } |
1947 | case KVM_SET_FPU: { |
1948 | fpu = memdup_user(argp, sizeof(*fpu)); |
1949 | if (IS_ERR(fpu)) { |
1950 | r = PTR_ERR(fpu); |
1951 | goto out; |
1952 | } |
1953 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
1954 | if (r) |
1955 | goto out; |
1956 | r = 0; |
1957 | break; |
1958 | } |
1959 | default: |
1960 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
1961 | } |
1962 | out: |
1963 | vcpu_put(vcpu); |
1964 | kfree(fpu); |
1965 | kfree(kvm_sregs); |
1966 | return r; |
1967 | } |
1968 | |
1969 | #ifdef CONFIG_COMPAT |
1970 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
1971 | unsigned int ioctl, unsigned long arg) |
1972 | { |
1973 | struct kvm_vcpu *vcpu = filp->private_data; |
1974 | void __user *argp = compat_ptr(arg); |
1975 | int r; |
1976 | |
1977 | if (vcpu->kvm->mm != current->mm) |
1978 | return -EIO; |
1979 | |
1980 | switch (ioctl) { |
1981 | case KVM_SET_SIGNAL_MASK: { |
1982 | struct kvm_signal_mask __user *sigmask_arg = argp; |
1983 | struct kvm_signal_mask kvm_sigmask; |
1984 | compat_sigset_t csigset; |
1985 | sigset_t sigset; |
1986 | |
1987 | if (argp) { |
1988 | r = -EFAULT; |
1989 | if (copy_from_user(&kvm_sigmask, argp, |
1990 | sizeof kvm_sigmask)) |
1991 | goto out; |
1992 | r = -EINVAL; |
1993 | if (kvm_sigmask.len != sizeof csigset) |
1994 | goto out; |
1995 | r = -EFAULT; |
1996 | if (copy_from_user(&csigset, sigmask_arg->sigset, |
1997 | sizeof csigset)) |
1998 | goto out; |
1999 | } |
2000 | sigset_from_compat(&sigset, &csigset); |
2001 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
2002 | break; |
2003 | } |
2004 | default: |
2005 | r = kvm_vcpu_ioctl(filp, ioctl, arg); |
2006 | } |
2007 | |
2008 | out: |
2009 | return r; |
2010 | } |
2011 | #endif |
2012 | |
2013 | static long kvm_vm_ioctl(struct file *filp, |
2014 | unsigned int ioctl, unsigned long arg) |
2015 | { |
2016 | struct kvm *kvm = filp->private_data; |
2017 | void __user *argp = (void __user *)arg; |
2018 | int r; |
2019 | |
2020 | if (kvm->mm != current->mm) |
2021 | return -EIO; |
2022 | switch (ioctl) { |
2023 | case KVM_CREATE_VCPU: |
2024 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); |
2025 | if (r < 0) |
2026 | goto out; |
2027 | break; |
2028 | case KVM_SET_USER_MEMORY_REGION: { |
2029 | struct kvm_userspace_memory_region kvm_userspace_mem; |
2030 | |
2031 | r = -EFAULT; |
2032 | if (copy_from_user(&kvm_userspace_mem, argp, |
2033 | sizeof kvm_userspace_mem)) |
2034 | goto out; |
2035 | |
2036 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); |
2037 | if (r) |
2038 | goto out; |
2039 | break; |
2040 | } |
2041 | case KVM_GET_DIRTY_LOG: { |
2042 | struct kvm_dirty_log log; |
2043 | |
2044 | r = -EFAULT; |
2045 | if (copy_from_user(&log, argp, sizeof log)) |
2046 | goto out; |
2047 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
2048 | if (r) |
2049 | goto out; |
2050 | break; |
2051 | } |
2052 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2053 | case KVM_REGISTER_COALESCED_MMIO: { |
2054 | struct kvm_coalesced_mmio_zone zone; |
2055 | r = -EFAULT; |
2056 | if (copy_from_user(&zone, argp, sizeof zone)) |
2057 | goto out; |
2058 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
2059 | if (r) |
2060 | goto out; |
2061 | r = 0; |
2062 | break; |
2063 | } |
2064 | case KVM_UNREGISTER_COALESCED_MMIO: { |
2065 | struct kvm_coalesced_mmio_zone zone; |
2066 | r = -EFAULT; |
2067 | if (copy_from_user(&zone, argp, sizeof zone)) |
2068 | goto out; |
2069 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
2070 | if (r) |
2071 | goto out; |
2072 | r = 0; |
2073 | break; |
2074 | } |
2075 | #endif |
2076 | case KVM_IRQFD: { |
2077 | struct kvm_irqfd data; |
2078 | |
2079 | r = -EFAULT; |
2080 | if (copy_from_user(&data, argp, sizeof data)) |
2081 | goto out; |
2082 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); |
2083 | break; |
2084 | } |
2085 | case KVM_IOEVENTFD: { |
2086 | struct kvm_ioeventfd data; |
2087 | |
2088 | r = -EFAULT; |
2089 | if (copy_from_user(&data, argp, sizeof data)) |
2090 | goto out; |
2091 | r = kvm_ioeventfd(kvm, &data); |
2092 | break; |
2093 | } |
2094 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2095 | case KVM_SET_BOOT_CPU_ID: |
2096 | r = 0; |
2097 | mutex_lock(&kvm->lock); |
2098 | if (atomic_read(&kvm->online_vcpus) != 0) |
2099 | r = -EBUSY; |
2100 | else |
2101 | kvm->bsp_vcpu_id = arg; |
2102 | mutex_unlock(&kvm->lock); |
2103 | break; |
2104 | #endif |
2105 | default: |
2106 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
2107 | if (r == -ENOTTY) |
2108 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); |
2109 | } |
2110 | out: |
2111 | return r; |
2112 | } |
2113 | |
2114 | #ifdef CONFIG_COMPAT |
2115 | struct compat_kvm_dirty_log { |
2116 | __u32 slot; |
2117 | __u32 padding1; |
2118 | union { |
2119 | compat_uptr_t dirty_bitmap; /* one bit per page */ |
2120 | __u64 padding2; |
2121 | }; |
2122 | }; |
2123 | |
2124 | static long kvm_vm_compat_ioctl(struct file *filp, |
2125 | unsigned int ioctl, unsigned long arg) |
2126 | { |
2127 | struct kvm *kvm = filp->private_data; |
2128 | int r; |
2129 | |
2130 | if (kvm->mm != current->mm) |
2131 | return -EIO; |
2132 | switch (ioctl) { |
2133 | case KVM_GET_DIRTY_LOG: { |
2134 | struct compat_kvm_dirty_log compat_log; |
2135 | struct kvm_dirty_log log; |
2136 | |
2137 | r = -EFAULT; |
2138 | if (copy_from_user(&compat_log, (void __user *)arg, |
2139 | sizeof(compat_log))) |
2140 | goto out; |
2141 | log.slot = compat_log.slot; |
2142 | log.padding1 = compat_log.padding1; |
2143 | log.padding2 = compat_log.padding2; |
2144 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); |
2145 | |
2146 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
2147 | if (r) |
2148 | goto out; |
2149 | break; |
2150 | } |
2151 | default: |
2152 | r = kvm_vm_ioctl(filp, ioctl, arg); |
2153 | } |
2154 | |
2155 | out: |
2156 | return r; |
2157 | } |
2158 | #endif |
2159 | |
2160 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
2161 | { |
2162 | struct page *page[1]; |
2163 | unsigned long addr; |
2164 | int npages; |
2165 | gfn_t gfn = vmf->pgoff; |
2166 | struct kvm *kvm = vma->vm_file->private_data; |
2167 | |
2168 | addr = gfn_to_hva(kvm, gfn); |
2169 | if (kvm_is_error_hva(addr)) |
2170 | return VM_FAULT_SIGBUS; |
2171 | |
2172 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, |
2173 | NULL); |
2174 | if (unlikely(npages != 1)) |
2175 | return VM_FAULT_SIGBUS; |
2176 | |
2177 | vmf->page = page[0]; |
2178 | return 0; |
2179 | } |
2180 | |
2181 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
2182 | .fault = kvm_vm_fault, |
2183 | }; |
2184 | |
2185 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) |
2186 | { |
2187 | vma->vm_ops = &kvm_vm_vm_ops; |
2188 | return 0; |
2189 | } |
2190 | |
2191 | static struct file_operations kvm_vm_fops = { |
2192 | .release = kvm_vm_release, |
2193 | .unlocked_ioctl = kvm_vm_ioctl, |
2194 | #ifdef CONFIG_COMPAT |
2195 | .compat_ioctl = kvm_vm_compat_ioctl, |
2196 | #endif |
2197 | .mmap = kvm_vm_mmap, |
2198 | .llseek = noop_llseek, |
2199 | }; |
2200 | |
2201 | static int kvm_dev_ioctl_create_vm(void) |
2202 | { |
2203 | int r; |
2204 | struct kvm *kvm; |
2205 | |
2206 | kvm = kvm_create_vm(); |
2207 | if (IS_ERR(kvm)) |
2208 | return PTR_ERR(kvm); |
2209 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2210 | r = kvm_coalesced_mmio_init(kvm); |
2211 | if (r < 0) { |
2212 | kvm_put_kvm(kvm); |
2213 | return r; |
2214 | } |
2215 | #endif |
2216 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2217 | if (r < 0) |
2218 | kvm_put_kvm(kvm); |
2219 | |
2220 | return r; |
2221 | } |
2222 | |
2223 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2224 | { |
2225 | switch (arg) { |
2226 | case KVM_CAP_USER_MEMORY: |
2227 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
2228 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
2229 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2230 | case KVM_CAP_SET_BOOT_CPU_ID: |
2231 | #endif |
2232 | case KVM_CAP_INTERNAL_ERROR_DATA: |
2233 | return 1; |
2234 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2235 | case KVM_CAP_IRQ_ROUTING: |
2236 | return KVM_MAX_IRQ_ROUTES; |
2237 | #endif |
2238 | default: |
2239 | break; |
2240 | } |
2241 | return kvm_dev_ioctl_check_extension(arg); |
2242 | } |
2243 | |
2244 | static long kvm_dev_ioctl(struct file *filp, |
2245 | unsigned int ioctl, unsigned long arg) |
2246 | { |
2247 | long r = -EINVAL; |
2248 | |
2249 | switch (ioctl) { |
2250 | case KVM_GET_API_VERSION: |
2251 | r = -EINVAL; |
2252 | if (arg) |
2253 | goto out; |
2254 | r = KVM_API_VERSION; |
2255 | break; |
2256 | case KVM_CREATE_VM: |
2257 | r = -EINVAL; |
2258 | if (arg) |
2259 | goto out; |
2260 | r = kvm_dev_ioctl_create_vm(); |
2261 | break; |
2262 | case KVM_CHECK_EXTENSION: |
2263 | r = kvm_dev_ioctl_check_extension_generic(arg); |
2264 | break; |
2265 | case KVM_GET_VCPU_MMAP_SIZE: |
2266 | r = -EINVAL; |
2267 | if (arg) |
2268 | goto out; |
2269 | r = PAGE_SIZE; /* struct kvm_run */ |
2270 | #ifdef CONFIG_X86 |
2271 | r += PAGE_SIZE; /* pio data page */ |
2272 | #endif |
2273 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2274 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
2275 | #endif |
2276 | break; |
2277 | case KVM_TRACE_ENABLE: |
2278 | case KVM_TRACE_PAUSE: |
2279 | case KVM_TRACE_DISABLE: |
2280 | r = -EOPNOTSUPP; |
2281 | break; |
2282 | default: |
2283 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
2284 | } |
2285 | out: |
2286 | return r; |
2287 | } |
2288 | |
2289 | static struct file_operations kvm_chardev_ops = { |
2290 | .unlocked_ioctl = kvm_dev_ioctl, |
2291 | .compat_ioctl = kvm_dev_ioctl, |
2292 | .llseek = noop_llseek, |
2293 | }; |
2294 | |
2295 | static struct miscdevice kvm_dev = { |
2296 | KVM_MINOR, |
2297 | "kvm", |
2298 | &kvm_chardev_ops, |
2299 | }; |
2300 | |
2301 | static void hardware_enable_nolock(void *junk) |
2302 | { |
2303 | int cpu = raw_smp_processor_id(); |
2304 | int r; |
2305 | |
2306 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
2307 | return; |
2308 | |
2309 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
2310 | |
2311 | r = kvm_arch_hardware_enable(NULL); |
2312 | |
2313 | if (r) { |
2314 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
2315 | atomic_inc(&hardware_enable_failed); |
2316 | printk(KERN_INFO "kvm: enabling virtualization on " |
2317 | "CPU%d failed\n", cpu); |
2318 | } |
2319 | } |
2320 | |
2321 | static void hardware_enable(void *junk) |
2322 | { |
2323 | raw_spin_lock(&kvm_lock); |
2324 | hardware_enable_nolock(junk); |
2325 | raw_spin_unlock(&kvm_lock); |
2326 | } |
2327 | |
2328 | static void hardware_disable_nolock(void *junk) |
2329 | { |
2330 | int cpu = raw_smp_processor_id(); |
2331 | |
2332 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
2333 | return; |
2334 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
2335 | kvm_arch_hardware_disable(NULL); |
2336 | } |
2337 | |
2338 | static void hardware_disable(void *junk) |
2339 | { |
2340 | raw_spin_lock(&kvm_lock); |
2341 | hardware_disable_nolock(junk); |
2342 | raw_spin_unlock(&kvm_lock); |
2343 | } |
2344 | |
2345 | static void hardware_disable_all_nolock(void) |
2346 | { |
2347 | BUG_ON(!kvm_usage_count); |
2348 | |
2349 | kvm_usage_count--; |
2350 | if (!kvm_usage_count) |
2351 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
2352 | } |
2353 | |
2354 | static void hardware_disable_all(void) |
2355 | { |
2356 | raw_spin_lock(&kvm_lock); |
2357 | hardware_disable_all_nolock(); |
2358 | raw_spin_unlock(&kvm_lock); |
2359 | } |
2360 | |
2361 | static int hardware_enable_all(void) |
2362 | { |
2363 | int r = 0; |
2364 | |
2365 | raw_spin_lock(&kvm_lock); |
2366 | |
2367 | kvm_usage_count++; |
2368 | if (kvm_usage_count == 1) { |
2369 | atomic_set(&hardware_enable_failed, 0); |
2370 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
2371 | |
2372 | if (atomic_read(&hardware_enable_failed)) { |
2373 | hardware_disable_all_nolock(); |
2374 | r = -EBUSY; |
2375 | } |
2376 | } |
2377 | |
2378 | raw_spin_unlock(&kvm_lock); |
2379 | |
2380 | return r; |
2381 | } |
2382 | |
2383 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2384 | void *v) |
2385 | { |
2386 | int cpu = (long)v; |
2387 | |
2388 | if (!kvm_usage_count) |
2389 | return NOTIFY_OK; |
2390 | |
2391 | val &= ~CPU_TASKS_FROZEN; |
2392 | switch (val) { |
2393 | case CPU_DYING: |
2394 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2395 | cpu); |
2396 | hardware_disable(NULL); |
2397 | break; |
2398 | case CPU_STARTING: |
2399 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2400 | cpu); |
2401 | hardware_enable(NULL); |
2402 | break; |
2403 | } |
2404 | return NOTIFY_OK; |
2405 | } |
2406 | |
2407 | |
2408 | asmlinkage void kvm_spurious_fault(void) |
2409 | { |
2410 | /* Fault while not rebooting. We want the trace. */ |
2411 | BUG(); |
2412 | } |
2413 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
2414 | |
2415 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
2416 | void *v) |
2417 | { |
2418 | /* |
2419 | * Some (well, at least mine) BIOSes hang on reboot if |
2420 | * in vmx root mode. |
2421 | * |
2422 | * And Intel TXT required VMX off for all cpu when system shutdown. |
2423 | */ |
2424 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); |
2425 | kvm_rebooting = true; |
2426 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
2427 | return NOTIFY_OK; |
2428 | } |
2429 | |
2430 | static struct notifier_block kvm_reboot_notifier = { |
2431 | .notifier_call = kvm_reboot, |
2432 | .priority = 0, |
2433 | }; |
2434 | |
2435 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2436 | { |
2437 | int i; |
2438 | |
2439 | for (i = 0; i < bus->dev_count; i++) { |
2440 | struct kvm_io_device *pos = bus->range[i].dev; |
2441 | |
2442 | kvm_iodevice_destructor(pos); |
2443 | } |
2444 | kfree(bus); |
2445 | } |
2446 | |
2447 | int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
2448 | { |
2449 | const struct kvm_io_range *r1 = p1; |
2450 | const struct kvm_io_range *r2 = p2; |
2451 | |
2452 | if (r1->addr < r2->addr) |
2453 | return -1; |
2454 | if (r1->addr + r1->len > r2->addr + r2->len) |
2455 | return 1; |
2456 | return 0; |
2457 | } |
2458 | |
2459 | int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, |
2460 | gpa_t addr, int len) |
2461 | { |
2462 | if (bus->dev_count == NR_IOBUS_DEVS) |
2463 | return -ENOSPC; |
2464 | |
2465 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
2466 | .addr = addr, |
2467 | .len = len, |
2468 | .dev = dev, |
2469 | }; |
2470 | |
2471 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), |
2472 | kvm_io_bus_sort_cmp, NULL); |
2473 | |
2474 | return 0; |
2475 | } |
2476 | |
2477 | int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
2478 | gpa_t addr, int len) |
2479 | { |
2480 | struct kvm_io_range *range, key; |
2481 | int off; |
2482 | |
2483 | key = (struct kvm_io_range) { |
2484 | .addr = addr, |
2485 | .len = len, |
2486 | }; |
2487 | |
2488 | range = bsearch(&key, bus->range, bus->dev_count, |
2489 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); |
2490 | if (range == NULL) |
2491 | return -ENOENT; |
2492 | |
2493 | off = range - bus->range; |
2494 | |
2495 | while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) |
2496 | off--; |
2497 | |
2498 | return off; |
2499 | } |
2500 | |
2501 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
2502 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2503 | int len, const void *val) |
2504 | { |
2505 | int idx; |
2506 | struct kvm_io_bus *bus; |
2507 | struct kvm_io_range range; |
2508 | |
2509 | range = (struct kvm_io_range) { |
2510 | .addr = addr, |
2511 | .len = len, |
2512 | }; |
2513 | |
2514 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
2515 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2516 | if (idx < 0) |
2517 | return -EOPNOTSUPP; |
2518 | |
2519 | while (idx < bus->dev_count && |
2520 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { |
2521 | if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) |
2522 | return 0; |
2523 | idx++; |
2524 | } |
2525 | |
2526 | return -EOPNOTSUPP; |
2527 | } |
2528 | |
2529 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
2530 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2531 | int len, void *val) |
2532 | { |
2533 | int idx; |
2534 | struct kvm_io_bus *bus; |
2535 | struct kvm_io_range range; |
2536 | |
2537 | range = (struct kvm_io_range) { |
2538 | .addr = addr, |
2539 | .len = len, |
2540 | }; |
2541 | |
2542 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
2543 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2544 | if (idx < 0) |
2545 | return -EOPNOTSUPP; |
2546 | |
2547 | while (idx < bus->dev_count && |
2548 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { |
2549 | if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) |
2550 | return 0; |
2551 | idx++; |
2552 | } |
2553 | |
2554 | return -EOPNOTSUPP; |
2555 | } |
2556 | |
2557 | /* Caller must hold slots_lock. */ |
2558 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2559 | int len, struct kvm_io_device *dev) |
2560 | { |
2561 | struct kvm_io_bus *new_bus, *bus; |
2562 | |
2563 | bus = kvm->buses[bus_idx]; |
2564 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2565 | return -ENOSPC; |
2566 | |
2567 | new_bus = kmemdup(bus, sizeof(struct kvm_io_bus), GFP_KERNEL); |
2568 | if (!new_bus) |
2569 | return -ENOMEM; |
2570 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
2571 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
2572 | synchronize_srcu_expedited(&kvm->srcu); |
2573 | kfree(bus); |
2574 | |
2575 | return 0; |
2576 | } |
2577 | |
2578 | /* Caller must hold slots_lock. */ |
2579 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2580 | struct kvm_io_device *dev) |
2581 | { |
2582 | int i, r; |
2583 | struct kvm_io_bus *new_bus, *bus; |
2584 | |
2585 | bus = kvm->buses[bus_idx]; |
2586 | |
2587 | new_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL); |
2588 | if (!new_bus) |
2589 | return -ENOMEM; |
2590 | |
2591 | r = -ENOENT; |
2592 | for (i = 0; i < new_bus->dev_count; i++) |
2593 | if (new_bus->range[i].dev == dev) { |
2594 | r = 0; |
2595 | new_bus->dev_count--; |
2596 | new_bus->range[i] = new_bus->range[new_bus->dev_count]; |
2597 | sort(new_bus->range, new_bus->dev_count, |
2598 | sizeof(struct kvm_io_range), |
2599 | kvm_io_bus_sort_cmp, NULL); |
2600 | break; |
2601 | } |
2602 | |
2603 | if (r) { |
2604 | kfree(new_bus); |
2605 | return r; |
2606 | } |
2607 | |
2608 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
2609 | synchronize_srcu_expedited(&kvm->srcu); |
2610 | kfree(bus); |
2611 | return r; |
2612 | } |
2613 | |
2614 | static struct notifier_block kvm_cpu_notifier = { |
2615 | .notifier_call = kvm_cpu_hotplug, |
2616 | }; |
2617 | |
2618 | static int vm_stat_get(void *_offset, u64 *val) |
2619 | { |
2620 | unsigned offset = (long)_offset; |
2621 | struct kvm *kvm; |
2622 | |
2623 | *val = 0; |
2624 | raw_spin_lock(&kvm_lock); |
2625 | list_for_each_entry(kvm, &vm_list, vm_list) |
2626 | *val += *(u32 *)((void *)kvm + offset); |
2627 | raw_spin_unlock(&kvm_lock); |
2628 | return 0; |
2629 | } |
2630 | |
2631 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); |
2632 | |
2633 | static int vcpu_stat_get(void *_offset, u64 *val) |
2634 | { |
2635 | unsigned offset = (long)_offset; |
2636 | struct kvm *kvm; |
2637 | struct kvm_vcpu *vcpu; |
2638 | int i; |
2639 | |
2640 | *val = 0; |
2641 | raw_spin_lock(&kvm_lock); |
2642 | list_for_each_entry(kvm, &vm_list, vm_list) |
2643 | kvm_for_each_vcpu(i, vcpu, kvm) |
2644 | *val += *(u32 *)((void *)vcpu + offset); |
2645 | |
2646 | raw_spin_unlock(&kvm_lock); |
2647 | return 0; |
2648 | } |
2649 | |
2650 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2651 | |
2652 | static const struct file_operations *stat_fops[] = { |
2653 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2654 | [KVM_STAT_VM] = &vm_stat_fops, |
2655 | }; |
2656 | |
2657 | static int kvm_init_debug(void) |
2658 | { |
2659 | int r = -EFAULT; |
2660 | struct kvm_stats_debugfs_item *p; |
2661 | |
2662 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
2663 | if (kvm_debugfs_dir == NULL) |
2664 | goto out; |
2665 | |
2666 | for (p = debugfs_entries; p->name; ++p) { |
2667 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
2668 | (void *)(long)p->offset, |
2669 | stat_fops[p->kind]); |
2670 | if (p->dentry == NULL) |
2671 | goto out_dir; |
2672 | } |
2673 | |
2674 | return 0; |
2675 | |
2676 | out_dir: |
2677 | debugfs_remove_recursive(kvm_debugfs_dir); |
2678 | out: |
2679 | return r; |
2680 | } |
2681 | |
2682 | static void kvm_exit_debug(void) |
2683 | { |
2684 | struct kvm_stats_debugfs_item *p; |
2685 | |
2686 | for (p = debugfs_entries; p->name; ++p) |
2687 | debugfs_remove(p->dentry); |
2688 | debugfs_remove(kvm_debugfs_dir); |
2689 | } |
2690 | |
2691 | static int kvm_suspend(void) |
2692 | { |
2693 | if (kvm_usage_count) |
2694 | hardware_disable_nolock(NULL); |
2695 | return 0; |
2696 | } |
2697 | |
2698 | static void kvm_resume(void) |
2699 | { |
2700 | if (kvm_usage_count) { |
2701 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
2702 | hardware_enable_nolock(NULL); |
2703 | } |
2704 | } |
2705 | |
2706 | static struct syscore_ops kvm_syscore_ops = { |
2707 | .suspend = kvm_suspend, |
2708 | .resume = kvm_resume, |
2709 | }; |
2710 | |
2711 | struct page *bad_page; |
2712 | pfn_t bad_pfn; |
2713 | |
2714 | static inline |
2715 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) |
2716 | { |
2717 | return container_of(pn, struct kvm_vcpu, preempt_notifier); |
2718 | } |
2719 | |
2720 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) |
2721 | { |
2722 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
2723 | |
2724 | kvm_arch_vcpu_load(vcpu, cpu); |
2725 | } |
2726 | |
2727 | static void kvm_sched_out(struct preempt_notifier *pn, |
2728 | struct task_struct *next) |
2729 | { |
2730 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
2731 | |
2732 | kvm_arch_vcpu_put(vcpu); |
2733 | } |
2734 | |
2735 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
2736 | struct module *module) |
2737 | { |
2738 | int r; |
2739 | int cpu; |
2740 | |
2741 | r = kvm_arch_init(opaque); |
2742 | if (r) |
2743 | goto out_fail; |
2744 | |
2745 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2746 | |
2747 | if (bad_page == NULL) { |
2748 | r = -ENOMEM; |
2749 | goto out; |
2750 | } |
2751 | |
2752 | bad_pfn = page_to_pfn(bad_page); |
2753 | |
2754 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2755 | |
2756 | if (hwpoison_page == NULL) { |
2757 | r = -ENOMEM; |
2758 | goto out_free_0; |
2759 | } |
2760 | |
2761 | hwpoison_pfn = page_to_pfn(hwpoison_page); |
2762 | |
2763 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2764 | |
2765 | if (fault_page == NULL) { |
2766 | r = -ENOMEM; |
2767 | goto out_free_0; |
2768 | } |
2769 | |
2770 | fault_pfn = page_to_pfn(fault_page); |
2771 | |
2772 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
2773 | r = -ENOMEM; |
2774 | goto out_free_0; |
2775 | } |
2776 | |
2777 | r = kvm_arch_hardware_setup(); |
2778 | if (r < 0) |
2779 | goto out_free_0a; |
2780 | |
2781 | for_each_online_cpu(cpu) { |
2782 | smp_call_function_single(cpu, |
2783 | kvm_arch_check_processor_compat, |
2784 | &r, 1); |
2785 | if (r < 0) |
2786 | goto out_free_1; |
2787 | } |
2788 | |
2789 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2790 | if (r) |
2791 | goto out_free_2; |
2792 | register_reboot_notifier(&kvm_reboot_notifier); |
2793 | |
2794 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
2795 | if (!vcpu_align) |
2796 | vcpu_align = __alignof__(struct kvm_vcpu); |
2797 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, |
2798 | 0, NULL); |
2799 | if (!kvm_vcpu_cache) { |
2800 | r = -ENOMEM; |
2801 | goto out_free_3; |
2802 | } |
2803 | |
2804 | r = kvm_async_pf_init(); |
2805 | if (r) |
2806 | goto out_free; |
2807 | |
2808 | kvm_chardev_ops.owner = module; |
2809 | kvm_vm_fops.owner = module; |
2810 | kvm_vcpu_fops.owner = module; |
2811 | |
2812 | r = misc_register(&kvm_dev); |
2813 | if (r) { |
2814 | printk(KERN_ERR "kvm: misc device register failed\n"); |
2815 | goto out_unreg; |
2816 | } |
2817 | |
2818 | register_syscore_ops(&kvm_syscore_ops); |
2819 | |
2820 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2821 | kvm_preempt_ops.sched_out = kvm_sched_out; |
2822 | |
2823 | r = kvm_init_debug(); |
2824 | if (r) { |
2825 | printk(KERN_ERR "kvm: create debugfs files failed\n"); |
2826 | goto out_undebugfs; |
2827 | } |
2828 | |
2829 | return 0; |
2830 | |
2831 | out_undebugfs: |
2832 | unregister_syscore_ops(&kvm_syscore_ops); |
2833 | out_unreg: |
2834 | kvm_async_pf_deinit(); |
2835 | out_free: |
2836 | kmem_cache_destroy(kvm_vcpu_cache); |
2837 | out_free_3: |
2838 | unregister_reboot_notifier(&kvm_reboot_notifier); |
2839 | unregister_cpu_notifier(&kvm_cpu_notifier); |
2840 | out_free_2: |
2841 | out_free_1: |
2842 | kvm_arch_hardware_unsetup(); |
2843 | out_free_0a: |
2844 | free_cpumask_var(cpus_hardware_enabled); |
2845 | out_free_0: |
2846 | if (fault_page) |
2847 | __free_page(fault_page); |
2848 | if (hwpoison_page) |
2849 | __free_page(hwpoison_page); |
2850 | __free_page(bad_page); |
2851 | out: |
2852 | kvm_arch_exit(); |
2853 | out_fail: |
2854 | return r; |
2855 | } |
2856 | EXPORT_SYMBOL_GPL(kvm_init); |
2857 | |
2858 | void kvm_exit(void) |
2859 | { |
2860 | kvm_exit_debug(); |
2861 | misc_deregister(&kvm_dev); |
2862 | kmem_cache_destroy(kvm_vcpu_cache); |
2863 | kvm_async_pf_deinit(); |
2864 | unregister_syscore_ops(&kvm_syscore_ops); |
2865 | unregister_reboot_notifier(&kvm_reboot_notifier); |
2866 | unregister_cpu_notifier(&kvm_cpu_notifier); |
2867 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
2868 | kvm_arch_hardware_unsetup(); |
2869 | kvm_arch_exit(); |
2870 | free_cpumask_var(cpus_hardware_enabled); |
2871 | __free_page(hwpoison_page); |
2872 | __free_page(bad_page); |
2873 | } |
2874 | EXPORT_SYMBOL_GPL(kvm_exit); |
2875 |
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