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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 <kvm/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/signal.h> | |
36 | #include <linux/sched/mm.h> | |
37 | #include <linux/cpumask.h> | |
38 | #include <linux/smp.h> | |
39 | #include <linux/anon_inodes.h> | |
40 | #include <linux/profile.h> | |
41 | #include <linux/kvm_para.h> | |
42 | #include <linux/pagemap.h> | |
43 | #include <linux/mman.h> | |
44 | #include <linux/swap.h> | |
45 | #include <linux/bitops.h> | |
46 | #include <linux/spinlock.h> | |
47 | #include <linux/compat.h> | |
48 | #include <linux/srcu.h> | |
49 | #include <linux/hugetlb.h> | |
50 | #include <linux/slab.h> | |
51 | #include <linux/sort.h> | |
52 | #include <linux/bsearch.h> | |
53 | ||
54 | #include <asm/processor.h> | |
55 | #include <asm/io.h> | |
56 | #include <asm/ioctl.h> | |
57 | #include <linux/uaccess.h> | |
58 | #include <asm/pgtable.h> | |
59 | ||
60 | #include "coalesced_mmio.h" | |
61 | #include "async_pf.h" | |
62 | #include "vfio.h" | |
63 | ||
64 | #define CREATE_TRACE_POINTS | |
65 | #include <trace/events/kvm.h> | |
66 | ||
67 | /* Worst case buffer size needed for holding an integer. */ | |
68 | #define ITOA_MAX_LEN 12 | |
69 | ||
70 | MODULE_AUTHOR("Qumranet"); | |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
73 | /* Architectures should define their poll value according to the halt latency */ | |
74 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; | |
75 | module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR); | |
76 | EXPORT_SYMBOL_GPL(halt_poll_ns); | |
77 | ||
78 | /* Default doubles per-vcpu halt_poll_ns. */ | |
79 | unsigned int halt_poll_ns_grow = 2; | |
80 | module_param(halt_poll_ns_grow, uint, S_IRUGO | S_IWUSR); | |
81 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); | |
82 | ||
83 | /* Default resets per-vcpu halt_poll_ns . */ | |
84 | unsigned int halt_poll_ns_shrink; | |
85 | module_param(halt_poll_ns_shrink, uint, S_IRUGO | S_IWUSR); | |
86 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); | |
87 | ||
88 | /* | |
89 | * Ordering of locks: | |
90 | * | |
91 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock | |
92 | */ | |
93 | ||
94 | DEFINE_SPINLOCK(kvm_lock); | |
95 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); | |
96 | LIST_HEAD(vm_list); | |
97 | ||
98 | static cpumask_var_t cpus_hardware_enabled; | |
99 | static int kvm_usage_count; | |
100 | static atomic_t hardware_enable_failed; | |
101 | ||
102 | struct kmem_cache *kvm_vcpu_cache; | |
103 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
104 | ||
105 | static __read_mostly struct preempt_ops kvm_preempt_ops; | |
106 | ||
107 | struct dentry *kvm_debugfs_dir; | |
108 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); | |
109 | ||
110 | static int kvm_debugfs_num_entries; | |
111 | static const struct file_operations *stat_fops_per_vm[]; | |
112 | ||
113 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, | |
114 | unsigned long arg); | |
115 | #ifdef CONFIG_KVM_COMPAT | |
116 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, | |
117 | unsigned long arg); | |
118 | #endif | |
119 | static int hardware_enable_all(void); | |
120 | static void hardware_disable_all(void); | |
121 | ||
122 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); | |
123 | ||
124 | static void kvm_release_pfn_dirty(kvm_pfn_t pfn); | |
125 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); | |
126 | ||
127 | __visible bool kvm_rebooting; | |
128 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
129 | ||
130 | static bool largepages_enabled = true; | |
131 | ||
132 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) | |
133 | { | |
134 | if (pfn_valid(pfn)) | |
135 | return PageReserved(pfn_to_page(pfn)); | |
136 | ||
137 | return true; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Switches to specified vcpu, until a matching vcpu_put() | |
142 | */ | |
143 | int vcpu_load(struct kvm_vcpu *vcpu) | |
144 | { | |
145 | int cpu; | |
146 | ||
147 | if (mutex_lock_killable(&vcpu->mutex)) | |
148 | return -EINTR; | |
149 | cpu = get_cpu(); | |
150 | preempt_notifier_register(&vcpu->preempt_notifier); | |
151 | kvm_arch_vcpu_load(vcpu, cpu); | |
152 | put_cpu(); | |
153 | return 0; | |
154 | } | |
155 | EXPORT_SYMBOL_GPL(vcpu_load); | |
156 | ||
157 | void vcpu_put(struct kvm_vcpu *vcpu) | |
158 | { | |
159 | preempt_disable(); | |
160 | kvm_arch_vcpu_put(vcpu); | |
161 | preempt_notifier_unregister(&vcpu->preempt_notifier); | |
162 | preempt_enable(); | |
163 | mutex_unlock(&vcpu->mutex); | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(vcpu_put); | |
166 | ||
167 | static void ack_flush(void *_completed) | |
168 | { | |
169 | } | |
170 | ||
171 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
172 | { | |
173 | int i, cpu, me; | |
174 | cpumask_var_t cpus; | |
175 | bool called = true; | |
176 | struct kvm_vcpu *vcpu; | |
177 | ||
178 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
179 | ||
180 | me = get_cpu(); | |
181 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
182 | kvm_make_request(req, vcpu); | |
183 | cpu = vcpu->cpu; | |
184 | ||
185 | /* Set ->requests bit before we read ->mode. */ | |
186 | smp_mb__after_atomic(); | |
187 | ||
188 | if (cpus != NULL && cpu != -1 && cpu != me && | |
189 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
190 | cpumask_set_cpu(cpu, cpus); | |
191 | } | |
192 | if (unlikely(cpus == NULL)) | |
193 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
194 | else if (!cpumask_empty(cpus)) | |
195 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
196 | else | |
197 | called = false; | |
198 | put_cpu(); | |
199 | free_cpumask_var(cpus); | |
200 | return called; | |
201 | } | |
202 | ||
203 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL | |
204 | void kvm_flush_remote_tlbs(struct kvm *kvm) | |
205 | { | |
206 | /* | |
207 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
208 | * kvm_make_all_cpus_request. | |
209 | */ | |
210 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
211 | ||
212 | /* | |
213 | * We want to publish modifications to the page tables before reading | |
214 | * mode. Pairs with a memory barrier in arch-specific code. | |
215 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
216 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
217 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
218 | * | |
219 | * There is already an smp_mb__after_atomic() before | |
220 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
221 | * barrier here. | |
222 | */ | |
223 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
224 | ++kvm->stat.remote_tlb_flush; | |
225 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); | |
226 | } | |
227 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); | |
228 | #endif | |
229 | ||
230 | void kvm_reload_remote_mmus(struct kvm *kvm) | |
231 | { | |
232 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
233 | } | |
234 | ||
235 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) | |
236 | { | |
237 | struct page *page; | |
238 | int r; | |
239 | ||
240 | mutex_init(&vcpu->mutex); | |
241 | vcpu->cpu = -1; | |
242 | vcpu->kvm = kvm; | |
243 | vcpu->vcpu_id = id; | |
244 | vcpu->pid = NULL; | |
245 | init_swait_queue_head(&vcpu->wq); | |
246 | kvm_async_pf_vcpu_init(vcpu); | |
247 | ||
248 | vcpu->pre_pcpu = -1; | |
249 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
250 | ||
251 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
252 | if (!page) { | |
253 | r = -ENOMEM; | |
254 | goto fail; | |
255 | } | |
256 | vcpu->run = page_address(page); | |
257 | ||
258 | kvm_vcpu_set_in_spin_loop(vcpu, false); | |
259 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
260 | vcpu->preempted = false; | |
261 | ||
262 | r = kvm_arch_vcpu_init(vcpu); | |
263 | if (r < 0) | |
264 | goto fail_free_run; | |
265 | return 0; | |
266 | ||
267 | fail_free_run: | |
268 | free_page((unsigned long)vcpu->run); | |
269 | fail: | |
270 | return r; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
273 | ||
274 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
275 | { | |
276 | put_pid(vcpu->pid); | |
277 | kvm_arch_vcpu_uninit(vcpu); | |
278 | free_page((unsigned long)vcpu->run); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
281 | ||
282 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
283 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
284 | { | |
285 | return container_of(mn, struct kvm, mmu_notifier); | |
286 | } | |
287 | ||
288 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
289 | struct mm_struct *mm, | |
290 | unsigned long address) | |
291 | { | |
292 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
293 | int need_tlb_flush, idx; | |
294 | ||
295 | /* | |
296 | * When ->invalidate_page runs, the linux pte has been zapped | |
297 | * already but the page is still allocated until | |
298 | * ->invalidate_page returns. So if we increase the sequence | |
299 | * here the kvm page fault will notice if the spte can't be | |
300 | * established because the page is going to be freed. If | |
301 | * instead the kvm page fault establishes the spte before | |
302 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
303 | * before returning. | |
304 | * | |
305 | * The sequence increase only need to be seen at spin_unlock | |
306 | * time, and not at spin_lock time. | |
307 | * | |
308 | * Increasing the sequence after the spin_unlock would be | |
309 | * unsafe because the kvm page fault could then establish the | |
310 | * pte after kvm_unmap_hva returned, without noticing the page | |
311 | * is going to be freed. | |
312 | */ | |
313 | idx = srcu_read_lock(&kvm->srcu); | |
314 | spin_lock(&kvm->mmu_lock); | |
315 | ||
316 | kvm->mmu_notifier_seq++; | |
317 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; | |
318 | /* we've to flush the tlb before the pages can be freed */ | |
319 | if (need_tlb_flush) | |
320 | kvm_flush_remote_tlbs(kvm); | |
321 | ||
322 | spin_unlock(&kvm->mmu_lock); | |
323 | ||
324 | kvm_arch_mmu_notifier_invalidate_page(kvm, address); | |
325 | ||
326 | srcu_read_unlock(&kvm->srcu, idx); | |
327 | } | |
328 | ||
329 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, | |
330 | struct mm_struct *mm, | |
331 | unsigned long address, | |
332 | pte_t pte) | |
333 | { | |
334 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
335 | int idx; | |
336 | ||
337 | idx = srcu_read_lock(&kvm->srcu); | |
338 | spin_lock(&kvm->mmu_lock); | |
339 | kvm->mmu_notifier_seq++; | |
340 | kvm_set_spte_hva(kvm, address, pte); | |
341 | spin_unlock(&kvm->mmu_lock); | |
342 | srcu_read_unlock(&kvm->srcu, idx); | |
343 | } | |
344 | ||
345 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, | |
346 | struct mm_struct *mm, | |
347 | unsigned long start, | |
348 | unsigned long end) | |
349 | { | |
350 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
351 | int need_tlb_flush = 0, idx; | |
352 | ||
353 | idx = srcu_read_lock(&kvm->srcu); | |
354 | spin_lock(&kvm->mmu_lock); | |
355 | /* | |
356 | * The count increase must become visible at unlock time as no | |
357 | * spte can be established without taking the mmu_lock and | |
358 | * count is also read inside the mmu_lock critical section. | |
359 | */ | |
360 | kvm->mmu_notifier_count++; | |
361 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); | |
362 | need_tlb_flush |= kvm->tlbs_dirty; | |
363 | /* we've to flush the tlb before the pages can be freed */ | |
364 | if (need_tlb_flush) | |
365 | kvm_flush_remote_tlbs(kvm); | |
366 | ||
367 | spin_unlock(&kvm->mmu_lock); | |
368 | srcu_read_unlock(&kvm->srcu, idx); | |
369 | } | |
370 | ||
371 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
372 | struct mm_struct *mm, | |
373 | unsigned long start, | |
374 | unsigned long end) | |
375 | { | |
376 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
377 | ||
378 | spin_lock(&kvm->mmu_lock); | |
379 | /* | |
380 | * This sequence increase will notify the kvm page fault that | |
381 | * the page that is going to be mapped in the spte could have | |
382 | * been freed. | |
383 | */ | |
384 | kvm->mmu_notifier_seq++; | |
385 | smp_wmb(); | |
386 | /* | |
387 | * The above sequence increase must be visible before the | |
388 | * below count decrease, which is ensured by the smp_wmb above | |
389 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
390 | */ | |
391 | kvm->mmu_notifier_count--; | |
392 | spin_unlock(&kvm->mmu_lock); | |
393 | ||
394 | BUG_ON(kvm->mmu_notifier_count < 0); | |
395 | } | |
396 | ||
397 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
398 | struct mm_struct *mm, | |
399 | unsigned long start, | |
400 | unsigned long end) | |
401 | { | |
402 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
403 | int young, idx; | |
404 | ||
405 | idx = srcu_read_lock(&kvm->srcu); | |
406 | spin_lock(&kvm->mmu_lock); | |
407 | ||
408 | young = kvm_age_hva(kvm, start, end); | |
409 | if (young) | |
410 | kvm_flush_remote_tlbs(kvm); | |
411 | ||
412 | spin_unlock(&kvm->mmu_lock); | |
413 | srcu_read_unlock(&kvm->srcu, idx); | |
414 | ||
415 | return young; | |
416 | } | |
417 | ||
418 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, | |
419 | struct mm_struct *mm, | |
420 | unsigned long start, | |
421 | unsigned long end) | |
422 | { | |
423 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
424 | int young, idx; | |
425 | ||
426 | idx = srcu_read_lock(&kvm->srcu); | |
427 | spin_lock(&kvm->mmu_lock); | |
428 | /* | |
429 | * Even though we do not flush TLB, this will still adversely | |
430 | * affect performance on pre-Haswell Intel EPT, where there is | |
431 | * no EPT Access Bit to clear so that we have to tear down EPT | |
432 | * tables instead. If we find this unacceptable, we can always | |
433 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
434 | * do anything on clear_young. | |
435 | * | |
436 | * Also note that currently we never issue secondary TLB flushes | |
437 | * from clear_young, leaving this job up to the regular system | |
438 | * cadence. If we find this inaccurate, we might come up with a | |
439 | * more sophisticated heuristic later. | |
440 | */ | |
441 | young = kvm_age_hva(kvm, start, end); | |
442 | spin_unlock(&kvm->mmu_lock); | |
443 | srcu_read_unlock(&kvm->srcu, idx); | |
444 | ||
445 | return young; | |
446 | } | |
447 | ||
448 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, | |
449 | struct mm_struct *mm, | |
450 | unsigned long address) | |
451 | { | |
452 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
453 | int young, idx; | |
454 | ||
455 | idx = srcu_read_lock(&kvm->srcu); | |
456 | spin_lock(&kvm->mmu_lock); | |
457 | young = kvm_test_age_hva(kvm, address); | |
458 | spin_unlock(&kvm->mmu_lock); | |
459 | srcu_read_unlock(&kvm->srcu, idx); | |
460 | ||
461 | return young; | |
462 | } | |
463 | ||
464 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, | |
465 | struct mm_struct *mm) | |
466 | { | |
467 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
468 | int idx; | |
469 | ||
470 | idx = srcu_read_lock(&kvm->srcu); | |
471 | kvm_arch_flush_shadow_all(kvm); | |
472 | srcu_read_unlock(&kvm->srcu, idx); | |
473 | } | |
474 | ||
475 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { | |
476 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
477 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
478 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
479 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
480 | .clear_young = kvm_mmu_notifier_clear_young, | |
481 | .test_young = kvm_mmu_notifier_test_young, | |
482 | .change_pte = kvm_mmu_notifier_change_pte, | |
483 | .release = kvm_mmu_notifier_release, | |
484 | }; | |
485 | ||
486 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
487 | { | |
488 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
489 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
490 | } | |
491 | ||
492 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
493 | ||
494 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
495 | { | |
496 | return 0; | |
497 | } | |
498 | ||
499 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ | |
500 | ||
501 | static struct kvm_memslots *kvm_alloc_memslots(void) | |
502 | { | |
503 | int i; | |
504 | struct kvm_memslots *slots; | |
505 | ||
506 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); | |
507 | if (!slots) | |
508 | return NULL; | |
509 | ||
510 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
511 | slots->id_to_index[i] = slots->memslots[i].id = i; | |
512 | ||
513 | return slots; | |
514 | } | |
515 | ||
516 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
517 | { | |
518 | if (!memslot->dirty_bitmap) | |
519 | return; | |
520 | ||
521 | kvfree(memslot->dirty_bitmap); | |
522 | memslot->dirty_bitmap = NULL; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Free any memory in @free but not in @dont. | |
527 | */ | |
528 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
529 | struct kvm_memory_slot *dont) | |
530 | { | |
531 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
532 | kvm_destroy_dirty_bitmap(free); | |
533 | ||
534 | kvm_arch_free_memslot(kvm, free, dont); | |
535 | ||
536 | free->npages = 0; | |
537 | } | |
538 | ||
539 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
540 | { | |
541 | struct kvm_memory_slot *memslot; | |
542 | ||
543 | if (!slots) | |
544 | return; | |
545 | ||
546 | kvm_for_each_memslot(memslot, slots) | |
547 | kvm_free_memslot(kvm, memslot, NULL); | |
548 | ||
549 | kvfree(slots); | |
550 | } | |
551 | ||
552 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) | |
553 | { | |
554 | int i; | |
555 | ||
556 | if (!kvm->debugfs_dentry) | |
557 | return; | |
558 | ||
559 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
560 | ||
561 | if (kvm->debugfs_stat_data) { | |
562 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
563 | kfree(kvm->debugfs_stat_data[i]); | |
564 | kfree(kvm->debugfs_stat_data); | |
565 | } | |
566 | } | |
567 | ||
568 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
569 | { | |
570 | char dir_name[ITOA_MAX_LEN * 2]; | |
571 | struct kvm_stat_data *stat_data; | |
572 | struct kvm_stats_debugfs_item *p; | |
573 | ||
574 | if (!debugfs_initialized()) | |
575 | return 0; | |
576 | ||
577 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
578 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, | |
579 | kvm_debugfs_dir); | |
580 | if (!kvm->debugfs_dentry) | |
581 | return -ENOMEM; | |
582 | ||
583 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
584 | sizeof(*kvm->debugfs_stat_data), | |
585 | GFP_KERNEL); | |
586 | if (!kvm->debugfs_stat_data) | |
587 | return -ENOMEM; | |
588 | ||
589 | for (p = debugfs_entries; p->name; p++) { | |
590 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); | |
591 | if (!stat_data) | |
592 | return -ENOMEM; | |
593 | ||
594 | stat_data->kvm = kvm; | |
595 | stat_data->offset = p->offset; | |
596 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; | |
597 | if (!debugfs_create_file(p->name, 0644, | |
598 | kvm->debugfs_dentry, | |
599 | stat_data, | |
600 | stat_fops_per_vm[p->kind])) | |
601 | return -ENOMEM; | |
602 | } | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static struct kvm *kvm_create_vm(unsigned long type) | |
607 | { | |
608 | int r, i; | |
609 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
610 | ||
611 | if (!kvm) | |
612 | return ERR_PTR(-ENOMEM); | |
613 | ||
614 | spin_lock_init(&kvm->mmu_lock); | |
615 | mmgrab(current->mm); | |
616 | kvm->mm = current->mm; | |
617 | kvm_eventfd_init(kvm); | |
618 | mutex_init(&kvm->lock); | |
619 | mutex_init(&kvm->irq_lock); | |
620 | mutex_init(&kvm->slots_lock); | |
621 | atomic_set(&kvm->users_count, 1); | |
622 | INIT_LIST_HEAD(&kvm->devices); | |
623 | ||
624 | r = kvm_arch_init_vm(kvm, type); | |
625 | if (r) | |
626 | goto out_err_no_disable; | |
627 | ||
628 | r = hardware_enable_all(); | |
629 | if (r) | |
630 | goto out_err_no_disable; | |
631 | ||
632 | #ifdef CONFIG_HAVE_KVM_IRQFD | |
633 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); | |
634 | #endif | |
635 | ||
636 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); | |
637 | ||
638 | r = -ENOMEM; | |
639 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { | |
640 | struct kvm_memslots *slots = kvm_alloc_memslots(); | |
641 | if (!slots) | |
642 | goto out_err_no_srcu; | |
643 | /* | |
644 | * Generations must be different for each address space. | |
645 | * Init kvm generation close to the maximum to easily test the | |
646 | * code of handling generation number wrap-around. | |
647 | */ | |
648 | slots->generation = i * 2 - 150; | |
649 | rcu_assign_pointer(kvm->memslots[i], slots); | |
650 | } | |
651 | ||
652 | if (init_srcu_struct(&kvm->srcu)) | |
653 | goto out_err_no_srcu; | |
654 | if (init_srcu_struct(&kvm->irq_srcu)) | |
655 | goto out_err_no_irq_srcu; | |
656 | for (i = 0; i < KVM_NR_BUSES; i++) { | |
657 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
658 | GFP_KERNEL); | |
659 | if (!kvm->buses[i]) | |
660 | goto out_err; | |
661 | } | |
662 | ||
663 | r = kvm_init_mmu_notifier(kvm); | |
664 | if (r) | |
665 | goto out_err; | |
666 | ||
667 | spin_lock(&kvm_lock); | |
668 | list_add(&kvm->vm_list, &vm_list); | |
669 | spin_unlock(&kvm_lock); | |
670 | ||
671 | preempt_notifier_inc(); | |
672 | ||
673 | return kvm; | |
674 | ||
675 | out_err: | |
676 | cleanup_srcu_struct(&kvm->irq_srcu); | |
677 | out_err_no_irq_srcu: | |
678 | cleanup_srcu_struct(&kvm->srcu); | |
679 | out_err_no_srcu: | |
680 | hardware_disable_all(); | |
681 | out_err_no_disable: | |
682 | for (i = 0; i < KVM_NR_BUSES; i++) | |
683 | kfree(kvm->buses[i]); | |
684 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) | |
685 | kvm_free_memslots(kvm, kvm->memslots[i]); | |
686 | kvm_arch_free_vm(kvm); | |
687 | mmdrop(current->mm); | |
688 | return ERR_PTR(r); | |
689 | } | |
690 | ||
691 | /* | |
692 | * Avoid using vmalloc for a small buffer. | |
693 | * Should not be used when the size is statically known. | |
694 | */ | |
695 | void *kvm_kvzalloc(unsigned long size) | |
696 | { | |
697 | if (size > PAGE_SIZE) | |
698 | return vzalloc(size); | |
699 | else | |
700 | return kzalloc(size, GFP_KERNEL); | |
701 | } | |
702 | ||
703 | static void kvm_destroy_devices(struct kvm *kvm) | |
704 | { | |
705 | struct kvm_device *dev, *tmp; | |
706 | ||
707 | /* | |
708 | * We do not need to take the kvm->lock here, because nobody else | |
709 | * has a reference to the struct kvm at this point and therefore | |
710 | * cannot access the devices list anyhow. | |
711 | */ | |
712 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { | |
713 | list_del(&dev->vm_node); | |
714 | dev->ops->destroy(dev); | |
715 | } | |
716 | } | |
717 | ||
718 | static void kvm_destroy_vm(struct kvm *kvm) | |
719 | { | |
720 | int i; | |
721 | struct mm_struct *mm = kvm->mm; | |
722 | ||
723 | kvm_destroy_vm_debugfs(kvm); | |
724 | kvm_arch_sync_events(kvm); | |
725 | spin_lock(&kvm_lock); | |
726 | list_del(&kvm->vm_list); | |
727 | spin_unlock(&kvm_lock); | |
728 | kvm_free_irq_routing(kvm); | |
729 | for (i = 0; i < KVM_NR_BUSES; i++) | |
730 | kvm_io_bus_destroy(kvm->buses[i]); | |
731 | kvm_coalesced_mmio_free(kvm); | |
732 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
733 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
734 | #else | |
735 | kvm_arch_flush_shadow_all(kvm); | |
736 | #endif | |
737 | kvm_arch_destroy_vm(kvm); | |
738 | kvm_destroy_devices(kvm); | |
739 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) | |
740 | kvm_free_memslots(kvm, kvm->memslots[i]); | |
741 | cleanup_srcu_struct(&kvm->irq_srcu); | |
742 | cleanup_srcu_struct(&kvm->srcu); | |
743 | kvm_arch_free_vm(kvm); | |
744 | preempt_notifier_dec(); | |
745 | hardware_disable_all(); | |
746 | mmdrop(mm); | |
747 | } | |
748 | ||
749 | void kvm_get_kvm(struct kvm *kvm) | |
750 | { | |
751 | atomic_inc(&kvm->users_count); | |
752 | } | |
753 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
754 | ||
755 | void kvm_put_kvm(struct kvm *kvm) | |
756 | { | |
757 | if (atomic_dec_and_test(&kvm->users_count)) | |
758 | kvm_destroy_vm(kvm); | |
759 | } | |
760 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
761 | ||
762 | ||
763 | static int kvm_vm_release(struct inode *inode, struct file *filp) | |
764 | { | |
765 | struct kvm *kvm = filp->private_data; | |
766 | ||
767 | kvm_irqfd_release(kvm); | |
768 | ||
769 | kvm_put_kvm(kvm); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | /* | |
774 | * Allocation size is twice as large as the actual dirty bitmap size. | |
775 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. | |
776 | */ | |
777 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) | |
778 | { | |
779 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); | |
780 | ||
781 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); | |
782 | if (!memslot->dirty_bitmap) | |
783 | return -ENOMEM; | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Insert memslot and re-sort memslots based on their GFN, | |
790 | * so binary search could be used to lookup GFN. | |
791 | * Sorting algorithm takes advantage of having initially | |
792 | * sorted array and known changed memslot position. | |
793 | */ | |
794 | static void update_memslots(struct kvm_memslots *slots, | |
795 | struct kvm_memory_slot *new) | |
796 | { | |
797 | int id = new->id; | |
798 | int i = slots->id_to_index[id]; | |
799 | struct kvm_memory_slot *mslots = slots->memslots; | |
800 | ||
801 | WARN_ON(mslots[i].id != id); | |
802 | if (!new->npages) { | |
803 | WARN_ON(!mslots[i].npages); | |
804 | if (mslots[i].npages) | |
805 | slots->used_slots--; | |
806 | } else { | |
807 | if (!mslots[i].npages) | |
808 | slots->used_slots++; | |
809 | } | |
810 | ||
811 | while (i < KVM_MEM_SLOTS_NUM - 1 && | |
812 | new->base_gfn <= mslots[i + 1].base_gfn) { | |
813 | if (!mslots[i + 1].npages) | |
814 | break; | |
815 | mslots[i] = mslots[i + 1]; | |
816 | slots->id_to_index[mslots[i].id] = i; | |
817 | i++; | |
818 | } | |
819 | ||
820 | /* | |
821 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
822 | * so that it moves before all those with base_gfn == npages == 0. | |
823 | * | |
824 | * On the other hand, if new->npages is zero, the above loop has | |
825 | * already left i pointing to the beginning of the empty part of | |
826 | * mslots, and the ">=" would move the hole backwards in this | |
827 | * case---which is wrong. So skip the loop when deleting a slot. | |
828 | */ | |
829 | if (new->npages) { | |
830 | while (i > 0 && | |
831 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
832 | mslots[i] = mslots[i - 1]; | |
833 | slots->id_to_index[mslots[i].id] = i; | |
834 | i--; | |
835 | } | |
836 | } else | |
837 | WARN_ON_ONCE(i != slots->used_slots); | |
838 | ||
839 | mslots[i] = *new; | |
840 | slots->id_to_index[mslots[i].id] = i; | |
841 | } | |
842 | ||
843 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) | |
844 | { | |
845 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; | |
846 | ||
847 | #ifdef __KVM_HAVE_READONLY_MEM | |
848 | valid_flags |= KVM_MEM_READONLY; | |
849 | #endif | |
850 | ||
851 | if (mem->flags & ~valid_flags) | |
852 | return -EINVAL; | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, | |
858 | int as_id, struct kvm_memslots *slots) | |
859 | { | |
860 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); | |
861 | ||
862 | /* | |
863 | * Set the low bit in the generation, which disables SPTE caching | |
864 | * until the end of synchronize_srcu_expedited. | |
865 | */ | |
866 | WARN_ON(old_memslots->generation & 1); | |
867 | slots->generation = old_memslots->generation + 1; | |
868 | ||
869 | rcu_assign_pointer(kvm->memslots[as_id], slots); | |
870 | synchronize_srcu_expedited(&kvm->srcu); | |
871 | ||
872 | /* | |
873 | * Increment the new memslot generation a second time. This prevents | |
874 | * vm exits that race with memslot updates from caching a memslot | |
875 | * generation that will (potentially) be valid forever. | |
876 | * | |
877 | * Generations must be unique even across address spaces. We do not need | |
878 | * a global counter for that, instead the generation space is evenly split | |
879 | * across address spaces. For example, with two address spaces, address | |
880 | * space 0 will use generations 0, 4, 8, ... while * address space 1 will | |
881 | * use generations 2, 6, 10, 14, ... | |
882 | */ | |
883 | slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1; | |
884 | ||
885 | kvm_arch_memslots_updated(kvm, slots); | |
886 | ||
887 | return old_memslots; | |
888 | } | |
889 | ||
890 | /* | |
891 | * Allocate some memory and give it an address in the guest physical address | |
892 | * space. | |
893 | * | |
894 | * Discontiguous memory is allowed, mostly for framebuffers. | |
895 | * | |
896 | * Must be called holding kvm->slots_lock for write. | |
897 | */ | |
898 | int __kvm_set_memory_region(struct kvm *kvm, | |
899 | const struct kvm_userspace_memory_region *mem) | |
900 | { | |
901 | int r; | |
902 | gfn_t base_gfn; | |
903 | unsigned long npages; | |
904 | struct kvm_memory_slot *slot; | |
905 | struct kvm_memory_slot old, new; | |
906 | struct kvm_memslots *slots = NULL, *old_memslots; | |
907 | int as_id, id; | |
908 | enum kvm_mr_change change; | |
909 | ||
910 | r = check_memory_region_flags(mem); | |
911 | if (r) | |
912 | goto out; | |
913 | ||
914 | r = -EINVAL; | |
915 | as_id = mem->slot >> 16; | |
916 | id = (u16)mem->slot; | |
917 | ||
918 | /* General sanity checks */ | |
919 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
920 | goto out; | |
921 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
922 | goto out; | |
923 | /* We can read the guest memory with __xxx_user() later on. */ | |
924 | if ((id < KVM_USER_MEM_SLOTS) && | |
925 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
926 | !access_ok(VERIFY_WRITE, | |
927 | (void __user *)(unsigned long)mem->userspace_addr, | |
928 | mem->memory_size))) | |
929 | goto out; | |
930 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) | |
931 | goto out; | |
932 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
933 | goto out; | |
934 | ||
935 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); | |
936 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; | |
937 | npages = mem->memory_size >> PAGE_SHIFT; | |
938 | ||
939 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
940 | goto out; | |
941 | ||
942 | new = old = *slot; | |
943 | ||
944 | new.id = id; | |
945 | new.base_gfn = base_gfn; | |
946 | new.npages = npages; | |
947 | new.flags = mem->flags; | |
948 | ||
949 | if (npages) { | |
950 | if (!old.npages) | |
951 | change = KVM_MR_CREATE; | |
952 | else { /* Modify an existing slot. */ | |
953 | if ((mem->userspace_addr != old.userspace_addr) || | |
954 | (npages != old.npages) || | |
955 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
956 | goto out; | |
957 | ||
958 | if (base_gfn != old.base_gfn) | |
959 | change = KVM_MR_MOVE; | |
960 | else if (new.flags != old.flags) | |
961 | change = KVM_MR_FLAGS_ONLY; | |
962 | else { /* Nothing to change. */ | |
963 | r = 0; | |
964 | goto out; | |
965 | } | |
966 | } | |
967 | } else { | |
968 | if (!old.npages) | |
969 | goto out; | |
970 | ||
971 | change = KVM_MR_DELETE; | |
972 | new.base_gfn = 0; | |
973 | new.flags = 0; | |
974 | } | |
975 | ||
976 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { | |
977 | /* Check for overlaps */ | |
978 | r = -EEXIST; | |
979 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { | |
980 | if ((slot->id >= KVM_USER_MEM_SLOTS) || | |
981 | (slot->id == id)) | |
982 | continue; | |
983 | if (!((base_gfn + npages <= slot->base_gfn) || | |
984 | (base_gfn >= slot->base_gfn + slot->npages))) | |
985 | goto out; | |
986 | } | |
987 | } | |
988 | ||
989 | /* Free page dirty bitmap if unneeded */ | |
990 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
991 | new.dirty_bitmap = NULL; | |
992 | ||
993 | r = -ENOMEM; | |
994 | if (change == KVM_MR_CREATE) { | |
995 | new.userspace_addr = mem->userspace_addr; | |
996 | ||
997 | if (kvm_arch_create_memslot(kvm, &new, npages)) | |
998 | goto out_free; | |
999 | } | |
1000 | ||
1001 | /* Allocate page dirty bitmap if needed */ | |
1002 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
1003 | if (kvm_create_dirty_bitmap(&new) < 0) | |
1004 | goto out_free; | |
1005 | } | |
1006 | ||
1007 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); | |
1008 | if (!slots) | |
1009 | goto out_free; | |
1010 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); | |
1011 | ||
1012 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { | |
1013 | slot = id_to_memslot(slots, id); | |
1014 | slot->flags |= KVM_MEMSLOT_INVALID; | |
1015 | ||
1016 | old_memslots = install_new_memslots(kvm, as_id, slots); | |
1017 | ||
1018 | /* slot was deleted or moved, clear iommu mapping */ | |
1019 | kvm_iommu_unmap_pages(kvm, &old); | |
1020 | /* From this point no new shadow pages pointing to a deleted, | |
1021 | * or moved, memslot will be created. | |
1022 | * | |
1023 | * validation of sp->gfn happens in: | |
1024 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
1025 | * - kvm_is_visible_gfn (mmu_check_roots) | |
1026 | */ | |
1027 | kvm_arch_flush_shadow_memslot(kvm, slot); | |
1028 | ||
1029 | /* | |
1030 | * We can re-use the old_memslots from above, the only difference | |
1031 | * from the currently installed memslots is the invalid flag. This | |
1032 | * will get overwritten by update_memslots anyway. | |
1033 | */ | |
1034 | slots = old_memslots; | |
1035 | } | |
1036 | ||
1037 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); | |
1038 | if (r) | |
1039 | goto out_slots; | |
1040 | ||
1041 | /* actual memory is freed via old in kvm_free_memslot below */ | |
1042 | if (change == KVM_MR_DELETE) { | |
1043 | new.dirty_bitmap = NULL; | |
1044 | memset(&new.arch, 0, sizeof(new.arch)); | |
1045 | } | |
1046 | ||
1047 | update_memslots(slots, &new); | |
1048 | old_memslots = install_new_memslots(kvm, as_id, slots); | |
1049 | ||
1050 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); | |
1051 | ||
1052 | kvm_free_memslot(kvm, &old, &new); | |
1053 | kvfree(old_memslots); | |
1054 | ||
1055 | /* | |
1056 | * IOMMU mapping: New slots need to be mapped. Old slots need to be | |
1057 | * un-mapped and re-mapped if their base changes. Since base change | |
1058 | * unmapping is handled above with slot deletion, mapping alone is | |
1059 | * needed here. Anything else the iommu might care about for existing | |
1060 | * slots (size changes, userspace addr changes and read-only flag | |
1061 | * changes) is disallowed above, so any other attribute changes getting | |
1062 | * here can be skipped. | |
1063 | */ | |
1064 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { | |
1065 | r = kvm_iommu_map_pages(kvm, &new); | |
1066 | return r; | |
1067 | } | |
1068 | ||
1069 | return 0; | |
1070 | ||
1071 | out_slots: | |
1072 | kvfree(slots); | |
1073 | out_free: | |
1074 | kvm_free_memslot(kvm, &new, &old); | |
1075 | out: | |
1076 | return r; | |
1077 | } | |
1078 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); | |
1079 | ||
1080 | int kvm_set_memory_region(struct kvm *kvm, | |
1081 | const struct kvm_userspace_memory_region *mem) | |
1082 | { | |
1083 | int r; | |
1084 | ||
1085 | mutex_lock(&kvm->slots_lock); | |
1086 | r = __kvm_set_memory_region(kvm, mem); | |
1087 | mutex_unlock(&kvm->slots_lock); | |
1088 | return r; | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); | |
1091 | ||
1092 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, | |
1093 | struct kvm_userspace_memory_region *mem) | |
1094 | { | |
1095 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) | |
1096 | return -EINVAL; | |
1097 | ||
1098 | return kvm_set_memory_region(kvm, mem); | |
1099 | } | |
1100 | ||
1101 | int kvm_get_dirty_log(struct kvm *kvm, | |
1102 | struct kvm_dirty_log *log, int *is_dirty) | |
1103 | { | |
1104 | struct kvm_memslots *slots; | |
1105 | struct kvm_memory_slot *memslot; | |
1106 | int i, as_id, id; | |
1107 | unsigned long n; | |
1108 | unsigned long any = 0; | |
1109 | ||
1110 | as_id = log->slot >> 16; | |
1111 | id = (u16)log->slot; | |
1112 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1113 | return -EINVAL; | |
1114 | ||
1115 | slots = __kvm_memslots(kvm, as_id); | |
1116 | memslot = id_to_memslot(slots, id); | |
1117 | if (!memslot->dirty_bitmap) | |
1118 | return -ENOENT; | |
1119 | ||
1120 | n = kvm_dirty_bitmap_bytes(memslot); | |
1121 | ||
1122 | for (i = 0; !any && i < n/sizeof(long); ++i) | |
1123 | any = memslot->dirty_bitmap[i]; | |
1124 | ||
1125 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
1126 | return -EFAULT; | |
1127 | ||
1128 | if (any) | |
1129 | *is_dirty = 1; | |
1130 | return 0; | |
1131 | } | |
1132 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); | |
1133 | ||
1134 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT | |
1135 | /** | |
1136 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages | |
1137 | * are dirty write protect them for next write. | |
1138 | * @kvm: pointer to kvm instance | |
1139 | * @log: slot id and address to which we copy the log | |
1140 | * @is_dirty: flag set if any page is dirty | |
1141 | * | |
1142 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1143 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1144 | * following order: | |
1145 | * | |
1146 | * 1. Take a snapshot of the bit and clear it if needed. | |
1147 | * 2. Write protect the corresponding page. | |
1148 | * 3. Copy the snapshot to the userspace. | |
1149 | * 4. Upon return caller flushes TLB's if needed. | |
1150 | * | |
1151 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1152 | * entry. This is not a problem because the page is reported dirty using | |
1153 | * the snapshot taken before and step 4 ensures that writes done after | |
1154 | * exiting to userspace will be logged for the next call. | |
1155 | * | |
1156 | */ | |
1157 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
1158 | struct kvm_dirty_log *log, bool *is_dirty) | |
1159 | { | |
1160 | struct kvm_memslots *slots; | |
1161 | struct kvm_memory_slot *memslot; | |
1162 | int i, as_id, id; | |
1163 | unsigned long n; | |
1164 | unsigned long *dirty_bitmap; | |
1165 | unsigned long *dirty_bitmap_buffer; | |
1166 | ||
1167 | as_id = log->slot >> 16; | |
1168 | id = (u16)log->slot; | |
1169 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1170 | return -EINVAL; | |
1171 | ||
1172 | slots = __kvm_memslots(kvm, as_id); | |
1173 | memslot = id_to_memslot(slots, id); | |
1174 | ||
1175 | dirty_bitmap = memslot->dirty_bitmap; | |
1176 | if (!dirty_bitmap) | |
1177 | return -ENOENT; | |
1178 | ||
1179 | n = kvm_dirty_bitmap_bytes(memslot); | |
1180 | ||
1181 | dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long); | |
1182 | memset(dirty_bitmap_buffer, 0, n); | |
1183 | ||
1184 | spin_lock(&kvm->mmu_lock); | |
1185 | *is_dirty = false; | |
1186 | for (i = 0; i < n / sizeof(long); i++) { | |
1187 | unsigned long mask; | |
1188 | gfn_t offset; | |
1189 | ||
1190 | if (!dirty_bitmap[i]) | |
1191 | continue; | |
1192 | ||
1193 | *is_dirty = true; | |
1194 | ||
1195 | mask = xchg(&dirty_bitmap[i], 0); | |
1196 | dirty_bitmap_buffer[i] = mask; | |
1197 | ||
1198 | if (mask) { | |
1199 | offset = i * BITS_PER_LONG; | |
1200 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1201 | offset, mask); | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | spin_unlock(&kvm->mmu_lock); | |
1206 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1207 | return -EFAULT; | |
1208 | return 0; | |
1209 | } | |
1210 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1211 | #endif | |
1212 | ||
1213 | bool kvm_largepages_enabled(void) | |
1214 | { | |
1215 | return largepages_enabled; | |
1216 | } | |
1217 | ||
1218 | void kvm_disable_largepages(void) | |
1219 | { | |
1220 | largepages_enabled = false; | |
1221 | } | |
1222 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1223 | ||
1224 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
1225 | { | |
1226 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(gfn_to_memslot); | |
1229 | ||
1230 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1231 | { | |
1232 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1233 | } | |
1234 | ||
1235 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) | |
1236 | { | |
1237 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); | |
1238 | ||
1239 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || | |
1240 | memslot->flags & KVM_MEMSLOT_INVALID) | |
1241 | return false; | |
1242 | ||
1243 | return true; | |
1244 | } | |
1245 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1246 | ||
1247 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) | |
1248 | { | |
1249 | struct vm_area_struct *vma; | |
1250 | unsigned long addr, size; | |
1251 | ||
1252 | size = PAGE_SIZE; | |
1253 | ||
1254 | addr = gfn_to_hva(kvm, gfn); | |
1255 | if (kvm_is_error_hva(addr)) | |
1256 | return PAGE_SIZE; | |
1257 | ||
1258 | down_read(¤t->mm->mmap_sem); | |
1259 | vma = find_vma(current->mm, addr); | |
1260 | if (!vma) | |
1261 | goto out; | |
1262 | ||
1263 | size = vma_kernel_pagesize(vma); | |
1264 | ||
1265 | out: | |
1266 | up_read(¤t->mm->mmap_sem); | |
1267 | ||
1268 | return size; | |
1269 | } | |
1270 | ||
1271 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) | |
1272 | { | |
1273 | return slot->flags & KVM_MEM_READONLY; | |
1274 | } | |
1275 | ||
1276 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, | |
1277 | gfn_t *nr_pages, bool write) | |
1278 | { | |
1279 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) | |
1280 | return KVM_HVA_ERR_BAD; | |
1281 | ||
1282 | if (memslot_is_readonly(slot) && write) | |
1283 | return KVM_HVA_ERR_RO_BAD; | |
1284 | ||
1285 | if (nr_pages) | |
1286 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1287 | ||
1288 | return __gfn_to_hva_memslot(slot, gfn); | |
1289 | } | |
1290 | ||
1291 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, | |
1292 | gfn_t *nr_pages) | |
1293 | { | |
1294 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
1295 | } | |
1296 | ||
1297 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, | |
1298 | gfn_t gfn) | |
1299 | { | |
1300 | return gfn_to_hva_many(slot, gfn, NULL); | |
1301 | } | |
1302 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1303 | ||
1304 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1305 | { | |
1306 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); | |
1307 | } | |
1308 | EXPORT_SYMBOL_GPL(gfn_to_hva); | |
1309 | ||
1310 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1311 | { | |
1312 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1313 | } | |
1314 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1315 | ||
1316 | /* | |
1317 | * If writable is set to false, the hva returned by this function is only | |
1318 | * allowed to be read. | |
1319 | */ | |
1320 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, | |
1321 | gfn_t gfn, bool *writable) | |
1322 | { | |
1323 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); | |
1324 | ||
1325 | if (!kvm_is_error_hva(hva) && writable) | |
1326 | *writable = !memslot_is_readonly(slot); | |
1327 | ||
1328 | return hva; | |
1329 | } | |
1330 | ||
1331 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) | |
1332 | { | |
1333 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1334 | ||
1335 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1336 | } | |
1337 | ||
1338 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) | |
1339 | { | |
1340 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1341 | ||
1342 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1343 | } | |
1344 | ||
1345 | static int get_user_page_nowait(unsigned long start, int write, | |
1346 | struct page **page) | |
1347 | { | |
1348 | int flags = FOLL_NOWAIT | FOLL_HWPOISON; | |
1349 | ||
1350 | if (write) | |
1351 | flags |= FOLL_WRITE; | |
1352 | ||
1353 | return get_user_pages(start, 1, flags, page, NULL); | |
1354 | } | |
1355 | ||
1356 | static inline int check_user_page_hwpoison(unsigned long addr) | |
1357 | { | |
1358 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; | |
1359 | ||
1360 | rc = get_user_pages(addr, 1, flags, NULL, NULL); | |
1361 | return rc == -EHWPOISON; | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1366 | * true indicates success, otherwise false is returned. | |
1367 | */ | |
1368 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1369 | bool write_fault, bool *writable, kvm_pfn_t *pfn) | |
1370 | { | |
1371 | struct page *page[1]; | |
1372 | int npages; | |
1373 | ||
1374 | if (!(async || atomic)) | |
1375 | return false; | |
1376 | ||
1377 | /* | |
1378 | * Fast pin a writable pfn only if it is a write fault request | |
1379 | * or the caller allows to map a writable pfn for a read fault | |
1380 | * request. | |
1381 | */ | |
1382 | if (!(write_fault || writable)) | |
1383 | return false; | |
1384 | ||
1385 | npages = __get_user_pages_fast(addr, 1, 1, page); | |
1386 | if (npages == 1) { | |
1387 | *pfn = page_to_pfn(page[0]); | |
1388 | ||
1389 | if (writable) | |
1390 | *writable = true; | |
1391 | return true; | |
1392 | } | |
1393 | ||
1394 | return false; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * The slow path to get the pfn of the specified host virtual address, | |
1399 | * 1 indicates success, -errno is returned if error is detected. | |
1400 | */ | |
1401 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1402 | bool *writable, kvm_pfn_t *pfn) | |
1403 | { | |
1404 | struct page *page[1]; | |
1405 | int npages = 0; | |
1406 | ||
1407 | might_sleep(); | |
1408 | ||
1409 | if (writable) | |
1410 | *writable = write_fault; | |
1411 | ||
1412 | if (async) { | |
1413 | down_read(¤t->mm->mmap_sem); | |
1414 | npages = get_user_page_nowait(addr, write_fault, page); | |
1415 | up_read(¤t->mm->mmap_sem); | |
1416 | } else { | |
1417 | unsigned int flags = FOLL_HWPOISON; | |
1418 | ||
1419 | if (write_fault) | |
1420 | flags |= FOLL_WRITE; | |
1421 | ||
1422 | npages = get_user_pages_unlocked(addr, 1, page, flags); | |
1423 | } | |
1424 | if (npages != 1) | |
1425 | return npages; | |
1426 | ||
1427 | /* map read fault as writable if possible */ | |
1428 | if (unlikely(!write_fault) && writable) { | |
1429 | struct page *wpage[1]; | |
1430 | ||
1431 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1432 | if (npages == 1) { | |
1433 | *writable = true; | |
1434 | put_page(page[0]); | |
1435 | page[0] = wpage[0]; | |
1436 | } | |
1437 | ||
1438 | npages = 1; | |
1439 | } | |
1440 | *pfn = page_to_pfn(page[0]); | |
1441 | return npages; | |
1442 | } | |
1443 | ||
1444 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) | |
1445 | { | |
1446 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1447 | return false; | |
1448 | ||
1449 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) | |
1450 | return false; | |
1451 | ||
1452 | return true; | |
1453 | } | |
1454 | ||
1455 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, | |
1456 | unsigned long addr, bool *async, | |
1457 | bool write_fault, kvm_pfn_t *p_pfn) | |
1458 | { | |
1459 | unsigned long pfn; | |
1460 | int r; | |
1461 | ||
1462 | r = follow_pfn(vma, addr, &pfn); | |
1463 | if (r) { | |
1464 | /* | |
1465 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1466 | * not call the fault handler, so do it here. | |
1467 | */ | |
1468 | bool unlocked = false; | |
1469 | r = fixup_user_fault(current, current->mm, addr, | |
1470 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1471 | &unlocked); | |
1472 | if (unlocked) | |
1473 | return -EAGAIN; | |
1474 | if (r) | |
1475 | return r; | |
1476 | ||
1477 | r = follow_pfn(vma, addr, &pfn); | |
1478 | if (r) | |
1479 | return r; | |
1480 | ||
1481 | } | |
1482 | ||
1483 | ||
1484 | /* | |
1485 | * Get a reference here because callers of *hva_to_pfn* and | |
1486 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1487 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1488 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1489 | * simply do nothing for reserved pfns. | |
1490 | * | |
1491 | * Whoever called remap_pfn_range is also going to call e.g. | |
1492 | * unmap_mapping_range before the underlying pages are freed, | |
1493 | * causing a call to our MMU notifier. | |
1494 | */ | |
1495 | kvm_get_pfn(pfn); | |
1496 | ||
1497 | *p_pfn = pfn; | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * Pin guest page in memory and return its pfn. | |
1503 | * @addr: host virtual address which maps memory to the guest | |
1504 | * @atomic: whether this function can sleep | |
1505 | * @async: whether this function need to wait IO complete if the | |
1506 | * host page is not in the memory | |
1507 | * @write_fault: whether we should get a writable host page | |
1508 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1509 | * | |
1510 | * The function will map a writable host page for these two cases: | |
1511 | * 1): @write_fault = true | |
1512 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1513 | * whether the mapping is writable. | |
1514 | */ | |
1515 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, | |
1516 | bool write_fault, bool *writable) | |
1517 | { | |
1518 | struct vm_area_struct *vma; | |
1519 | kvm_pfn_t pfn = 0; | |
1520 | int npages, r; | |
1521 | ||
1522 | /* we can do it either atomically or asynchronously, not both */ | |
1523 | BUG_ON(atomic && async); | |
1524 | ||
1525 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) | |
1526 | return pfn; | |
1527 | ||
1528 | if (atomic) | |
1529 | return KVM_PFN_ERR_FAULT; | |
1530 | ||
1531 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1532 | if (npages == 1) | |
1533 | return pfn; | |
1534 | ||
1535 | down_read(¤t->mm->mmap_sem); | |
1536 | if (npages == -EHWPOISON || | |
1537 | (!async && check_user_page_hwpoison(addr))) { | |
1538 | pfn = KVM_PFN_ERR_HWPOISON; | |
1539 | goto exit; | |
1540 | } | |
1541 | ||
1542 | retry: | |
1543 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1544 | ||
1545 | if (vma == NULL) | |
1546 | pfn = KVM_PFN_ERR_FAULT; | |
1547 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { | |
1548 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn); | |
1549 | if (r == -EAGAIN) | |
1550 | goto retry; | |
1551 | if (r < 0) | |
1552 | pfn = KVM_PFN_ERR_FAULT; | |
1553 | } else { | |
1554 | if (async && vma_is_valid(vma, write_fault)) | |
1555 | *async = true; | |
1556 | pfn = KVM_PFN_ERR_FAULT; | |
1557 | } | |
1558 | exit: | |
1559 | up_read(¤t->mm->mmap_sem); | |
1560 | return pfn; | |
1561 | } | |
1562 | ||
1563 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, | |
1564 | bool atomic, bool *async, bool write_fault, | |
1565 | bool *writable) | |
1566 | { | |
1567 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); | |
1568 | ||
1569 | if (addr == KVM_HVA_ERR_RO_BAD) { | |
1570 | if (writable) | |
1571 | *writable = false; | |
1572 | return KVM_PFN_ERR_RO_FAULT; | |
1573 | } | |
1574 | ||
1575 | if (kvm_is_error_hva(addr)) { | |
1576 | if (writable) | |
1577 | *writable = false; | |
1578 | return KVM_PFN_NOSLOT; | |
1579 | } | |
1580 | ||
1581 | /* Do not map writable pfn in the readonly memslot. */ | |
1582 | if (writable && memslot_is_readonly(slot)) { | |
1583 | *writable = false; | |
1584 | writable = NULL; | |
1585 | } | |
1586 | ||
1587 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1588 | writable); | |
1589 | } | |
1590 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); | |
1591 | ||
1592 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, | |
1593 | bool *writable) | |
1594 | { | |
1595 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, | |
1596 | write_fault, writable); | |
1597 | } | |
1598 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1599 | ||
1600 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) | |
1601 | { | |
1602 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); | |
1603 | } | |
1604 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); | |
1605 | ||
1606 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) | |
1607 | { | |
1608 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); | |
1609 | } | |
1610 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); | |
1611 | ||
1612 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1613 | { | |
1614 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1615 | } | |
1616 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1617 | ||
1618 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1619 | { | |
1620 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1623 | ||
1624 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) | |
1625 | { | |
1626 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1627 | } | |
1628 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1629 | ||
1630 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1631 | { | |
1632 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1633 | } | |
1634 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1635 | ||
1636 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, | |
1637 | struct page **pages, int nr_pages) | |
1638 | { | |
1639 | unsigned long addr; | |
1640 | gfn_t entry; | |
1641 | ||
1642 | addr = gfn_to_hva_many(slot, gfn, &entry); | |
1643 | if (kvm_is_error_hva(addr)) | |
1644 | return -1; | |
1645 | ||
1646 | if (entry < nr_pages) | |
1647 | return 0; | |
1648 | ||
1649 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1652 | ||
1653 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) | |
1654 | { | |
1655 | if (is_error_noslot_pfn(pfn)) | |
1656 | return KVM_ERR_PTR_BAD_PAGE; | |
1657 | ||
1658 | if (kvm_is_reserved_pfn(pfn)) { | |
1659 | WARN_ON(1); | |
1660 | return KVM_ERR_PTR_BAD_PAGE; | |
1661 | } | |
1662 | ||
1663 | return pfn_to_page(pfn); | |
1664 | } | |
1665 | ||
1666 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) | |
1667 | { | |
1668 | kvm_pfn_t pfn; | |
1669 | ||
1670 | pfn = gfn_to_pfn(kvm, gfn); | |
1671 | ||
1672 | return kvm_pfn_to_page(pfn); | |
1673 | } | |
1674 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1675 | ||
1676 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1677 | { | |
1678 | kvm_pfn_t pfn; | |
1679 | ||
1680 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1681 | ||
1682 | return kvm_pfn_to_page(pfn); | |
1683 | } | |
1684 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1685 | ||
1686 | void kvm_release_page_clean(struct page *page) | |
1687 | { | |
1688 | WARN_ON(is_error_page(page)); | |
1689 | ||
1690 | kvm_release_pfn_clean(page_to_pfn(page)); | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1693 | ||
1694 | void kvm_release_pfn_clean(kvm_pfn_t pfn) | |
1695 | { | |
1696 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) | |
1697 | put_page(pfn_to_page(pfn)); | |
1698 | } | |
1699 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1700 | ||
1701 | void kvm_release_page_dirty(struct page *page) | |
1702 | { | |
1703 | WARN_ON(is_error_page(page)); | |
1704 | ||
1705 | kvm_release_pfn_dirty(page_to_pfn(page)); | |
1706 | } | |
1707 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1708 | ||
1709 | static void kvm_release_pfn_dirty(kvm_pfn_t pfn) | |
1710 | { | |
1711 | kvm_set_pfn_dirty(pfn); | |
1712 | kvm_release_pfn_clean(pfn); | |
1713 | } | |
1714 | ||
1715 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) | |
1716 | { | |
1717 | if (!kvm_is_reserved_pfn(pfn)) { | |
1718 | struct page *page = pfn_to_page(pfn); | |
1719 | ||
1720 | if (!PageReserved(page)) | |
1721 | SetPageDirty(page); | |
1722 | } | |
1723 | } | |
1724 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); | |
1725 | ||
1726 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) | |
1727 | { | |
1728 | if (!kvm_is_reserved_pfn(pfn)) | |
1729 | mark_page_accessed(pfn_to_page(pfn)); | |
1730 | } | |
1731 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1732 | ||
1733 | void kvm_get_pfn(kvm_pfn_t pfn) | |
1734 | { | |
1735 | if (!kvm_is_reserved_pfn(pfn)) | |
1736 | get_page(pfn_to_page(pfn)); | |
1737 | } | |
1738 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
1739 | ||
1740 | static int next_segment(unsigned long len, int offset) | |
1741 | { | |
1742 | if (len > PAGE_SIZE - offset) | |
1743 | return PAGE_SIZE - offset; | |
1744 | else | |
1745 | return len; | |
1746 | } | |
1747 | ||
1748 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, | |
1749 | void *data, int offset, int len) | |
1750 | { | |
1751 | int r; | |
1752 | unsigned long addr; | |
1753 | ||
1754 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
1755 | if (kvm_is_error_hva(addr)) | |
1756 | return -EFAULT; | |
1757 | r = __copy_from_user(data, (void __user *)addr + offset, len); | |
1758 | if (r) | |
1759 | return -EFAULT; | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1764 | int len) | |
1765 | { | |
1766 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1767 | ||
1768 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1769 | } | |
1770 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1771 | ||
1772 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, | |
1773 | int offset, int len) | |
1774 | { | |
1775 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1776 | ||
1777 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1778 | } | |
1779 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1780 | ||
1781 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1782 | { | |
1783 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1784 | int seg; | |
1785 | int offset = offset_in_page(gpa); | |
1786 | int ret; | |
1787 | ||
1788 | while ((seg = next_segment(len, offset)) != 0) { | |
1789 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1790 | if (ret < 0) | |
1791 | return ret; | |
1792 | offset = 0; | |
1793 | len -= seg; | |
1794 | data += seg; | |
1795 | ++gfn; | |
1796 | } | |
1797 | return 0; | |
1798 | } | |
1799 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1800 | ||
1801 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) | |
1802 | { | |
1803 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1804 | int seg; | |
1805 | int offset = offset_in_page(gpa); | |
1806 | int ret; | |
1807 | ||
1808 | while ((seg = next_segment(len, offset)) != 0) { | |
1809 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
1810 | if (ret < 0) | |
1811 | return ret; | |
1812 | offset = 0; | |
1813 | len -= seg; | |
1814 | data += seg; | |
1815 | ++gfn; | |
1816 | } | |
1817 | return 0; | |
1818 | } | |
1819 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
1820 | ||
1821 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, | |
1822 | void *data, int offset, unsigned long len) | |
1823 | { | |
1824 | int r; | |
1825 | unsigned long addr; | |
1826 | ||
1827 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
1828 | if (kvm_is_error_hva(addr)) | |
1829 | return -EFAULT; | |
1830 | pagefault_disable(); | |
1831 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); | |
1832 | pagefault_enable(); | |
1833 | if (r) | |
1834 | return -EFAULT; | |
1835 | return 0; | |
1836 | } | |
1837 | ||
1838 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, | |
1839 | unsigned long len) | |
1840 | { | |
1841 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1842 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1843 | int offset = offset_in_page(gpa); | |
1844 | ||
1845 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1846 | } | |
1847 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1848 | ||
1849 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1850 | void *data, unsigned long len) | |
1851 | { | |
1852 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1853 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1854 | int offset = offset_in_page(gpa); | |
1855 | ||
1856 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1857 | } | |
1858 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1859 | ||
1860 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1861 | const void *data, int offset, int len) | |
1862 | { | |
1863 | int r; | |
1864 | unsigned long addr; | |
1865 | ||
1866 | addr = gfn_to_hva_memslot(memslot, gfn); | |
1867 | if (kvm_is_error_hva(addr)) | |
1868 | return -EFAULT; | |
1869 | r = __copy_to_user((void __user *)addr + offset, data, len); | |
1870 | if (r) | |
1871 | return -EFAULT; | |
1872 | mark_page_dirty_in_slot(memslot, gfn); | |
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
1877 | const void *data, int offset, int len) | |
1878 | { | |
1879 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1880 | ||
1881 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1882 | } | |
1883 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1884 | ||
1885 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, | |
1886 | const void *data, int offset, int len) | |
1887 | { | |
1888 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1889 | ||
1890 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1891 | } | |
1892 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
1893 | ||
1894 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1895 | unsigned long len) | |
1896 | { | |
1897 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1898 | int seg; | |
1899 | int offset = offset_in_page(gpa); | |
1900 | int ret; | |
1901 | ||
1902 | while ((seg = next_segment(len, offset)) != 0) { | |
1903 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1904 | if (ret < 0) | |
1905 | return ret; | |
1906 | offset = 0; | |
1907 | len -= seg; | |
1908 | data += seg; | |
1909 | ++gfn; | |
1910 | } | |
1911 | return 0; | |
1912 | } | |
1913 | EXPORT_SYMBOL_GPL(kvm_write_guest); | |
1914 | ||
1915 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, | |
1916 | unsigned long len) | |
1917 | { | |
1918 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1919 | int seg; | |
1920 | int offset = offset_in_page(gpa); | |
1921 | int ret; | |
1922 | ||
1923 | while ((seg = next_segment(len, offset)) != 0) { | |
1924 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
1925 | if (ret < 0) | |
1926 | return ret; | |
1927 | offset = 0; | |
1928 | len -= seg; | |
1929 | data += seg; | |
1930 | ++gfn; | |
1931 | } | |
1932 | return 0; | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
1935 | ||
1936 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, | |
1937 | struct gfn_to_hva_cache *ghc, | |
1938 | gpa_t gpa, unsigned long len) | |
1939 | { | |
1940 | int offset = offset_in_page(gpa); | |
1941 | gfn_t start_gfn = gpa >> PAGE_SHIFT; | |
1942 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1943 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1944 | gfn_t nr_pages_avail; | |
1945 | ||
1946 | ghc->gpa = gpa; | |
1947 | ghc->generation = slots->generation; | |
1948 | ghc->len = len; | |
1949 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
1950 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); | |
1951 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { | |
1952 | ghc->hva += offset; | |
1953 | } else { | |
1954 | /* | |
1955 | * If the requested region crosses two memslots, we still | |
1956 | * verify that the entire region is valid here. | |
1957 | */ | |
1958 | while (start_gfn <= end_gfn) { | |
1959 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
1960 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
1961 | &nr_pages_avail); | |
1962 | if (kvm_is_error_hva(ghc->hva)) | |
1963 | return -EFAULT; | |
1964 | start_gfn += nr_pages_avail; | |
1965 | } | |
1966 | /* Use the slow path for cross page reads and writes. */ | |
1967 | ghc->memslot = NULL; | |
1968 | } | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | int kvm_vcpu_gfn_to_hva_cache_init(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc, | |
1973 | gpa_t gpa, unsigned long len) | |
1974 | { | |
1975 | struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu); | |
1976 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); | |
1977 | } | |
1978 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva_cache_init); | |
1979 | ||
1980 | int kvm_vcpu_write_guest_offset_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc, | |
1981 | void *data, int offset, unsigned long len) | |
1982 | { | |
1983 | struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu); | |
1984 | int r; | |
1985 | gpa_t gpa = ghc->gpa + offset; | |
1986 | ||
1987 | BUG_ON(len + offset > ghc->len); | |
1988 | ||
1989 | if (slots->generation != ghc->generation) | |
1990 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); | |
1991 | ||
1992 | if (unlikely(!ghc->memslot)) | |
1993 | return kvm_vcpu_write_guest(vcpu, gpa, data, len); | |
1994 | ||
1995 | if (kvm_is_error_hva(ghc->hva)) | |
1996 | return -EFAULT; | |
1997 | ||
1998 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); | |
1999 | if (r) | |
2000 | return -EFAULT; | |
2001 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); | |
2002 | ||
2003 | return 0; | |
2004 | } | |
2005 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_offset_cached); | |
2006 | ||
2007 | int kvm_vcpu_write_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc, | |
2008 | void *data, unsigned long len) | |
2009 | { | |
2010 | return kvm_vcpu_write_guest_offset_cached(vcpu, ghc, data, 0, len); | |
2011 | } | |
2012 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_cached); | |
2013 | ||
2014 | int kvm_vcpu_read_guest_cached(struct kvm_vcpu *vcpu, struct gfn_to_hva_cache *ghc, | |
2015 | void *data, unsigned long len) | |
2016 | { | |
2017 | struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu); | |
2018 | int r; | |
2019 | ||
2020 | BUG_ON(len > ghc->len); | |
2021 | ||
2022 | if (slots->generation != ghc->generation) | |
2023 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); | |
2024 | ||
2025 | if (unlikely(!ghc->memslot)) | |
2026 | return kvm_vcpu_read_guest(vcpu, ghc->gpa, data, len); | |
2027 | ||
2028 | if (kvm_is_error_hva(ghc->hva)) | |
2029 | return -EFAULT; | |
2030 | ||
2031 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2032 | if (r) | |
2033 | return -EFAULT; | |
2034 | ||
2035 | return 0; | |
2036 | } | |
2037 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_cached); | |
2038 | ||
2039 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
2040 | { | |
2041 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); | |
2042 | ||
2043 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
2044 | } | |
2045 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2046 | ||
2047 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2048 | { | |
2049 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2050 | int seg; | |
2051 | int offset = offset_in_page(gpa); | |
2052 | int ret; | |
2053 | ||
2054 | while ((seg = next_segment(len, offset)) != 0) { | |
2055 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
2056 | if (ret < 0) | |
2057 | return ret; | |
2058 | offset = 0; | |
2059 | len -= seg; | |
2060 | ++gfn; | |
2061 | } | |
2062 | return 0; | |
2063 | } | |
2064 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2065 | ||
2066 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, | |
2067 | gfn_t gfn) | |
2068 | { | |
2069 | if (memslot && memslot->dirty_bitmap) { | |
2070 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
2071 | ||
2072 | set_bit_le(rel_gfn, memslot->dirty_bitmap); | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) | |
2077 | { | |
2078 | struct kvm_memory_slot *memslot; | |
2079 | ||
2080 | memslot = gfn_to_memslot(kvm, gfn); | |
2081 | mark_page_dirty_in_slot(memslot, gfn); | |
2082 | } | |
2083 | EXPORT_SYMBOL_GPL(mark_page_dirty); | |
2084 | ||
2085 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) | |
2086 | { | |
2087 | struct kvm_memory_slot *memslot; | |
2088 | ||
2089 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2090 | mark_page_dirty_in_slot(memslot, gfn); | |
2091 | } | |
2092 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2093 | ||
2094 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2095 | { | |
2096 | unsigned int old, val, grow; | |
2097 | ||
2098 | old = val = vcpu->halt_poll_ns; | |
2099 | grow = READ_ONCE(halt_poll_ns_grow); | |
2100 | /* 10us base */ | |
2101 | if (val == 0 && grow) | |
2102 | val = 10000; | |
2103 | else | |
2104 | val *= grow; | |
2105 | ||
2106 | if (val > halt_poll_ns) | |
2107 | val = halt_poll_ns; | |
2108 | ||
2109 | vcpu->halt_poll_ns = val; | |
2110 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); | |
2111 | } | |
2112 | ||
2113 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2114 | { | |
2115 | unsigned int old, val, shrink; | |
2116 | ||
2117 | old = val = vcpu->halt_poll_ns; | |
2118 | shrink = READ_ONCE(halt_poll_ns_shrink); | |
2119 | if (shrink == 0) | |
2120 | val = 0; | |
2121 | else | |
2122 | val /= shrink; | |
2123 | ||
2124 | vcpu->halt_poll_ns = val; | |
2125 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); | |
2126 | } | |
2127 | ||
2128 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) | |
2129 | { | |
2130 | if (kvm_arch_vcpu_runnable(vcpu)) { | |
2131 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
2132 | return -EINTR; | |
2133 | } | |
2134 | if (kvm_cpu_has_pending_timer(vcpu)) | |
2135 | return -EINTR; | |
2136 | if (signal_pending(current)) | |
2137 | return -EINTR; | |
2138 | ||
2139 | return 0; | |
2140 | } | |
2141 | ||
2142 | /* | |
2143 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2144 | */ | |
2145 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) | |
2146 | { | |
2147 | ktime_t start, cur; | |
2148 | DECLARE_SWAITQUEUE(wait); | |
2149 | bool waited = false; | |
2150 | u64 block_ns; | |
2151 | ||
2152 | start = cur = ktime_get(); | |
2153 | if (vcpu->halt_poll_ns) { | |
2154 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); | |
2155 | ||
2156 | ++vcpu->stat.halt_attempted_poll; | |
2157 | do { | |
2158 | /* | |
2159 | * This sets KVM_REQ_UNHALT if an interrupt | |
2160 | * arrives. | |
2161 | */ | |
2162 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2163 | ++vcpu->stat.halt_successful_poll; | |
2164 | if (!vcpu_valid_wakeup(vcpu)) | |
2165 | ++vcpu->stat.halt_poll_invalid; | |
2166 | goto out; | |
2167 | } | |
2168 | cur = ktime_get(); | |
2169 | } while (single_task_running() && ktime_before(cur, stop)); | |
2170 | } | |
2171 | ||
2172 | kvm_arch_vcpu_blocking(vcpu); | |
2173 | ||
2174 | for (;;) { | |
2175 | prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
2176 | ||
2177 | if (kvm_vcpu_check_block(vcpu) < 0) | |
2178 | break; | |
2179 | ||
2180 | waited = true; | |
2181 | schedule(); | |
2182 | } | |
2183 | ||
2184 | finish_swait(&vcpu->wq, &wait); | |
2185 | cur = ktime_get(); | |
2186 | ||
2187 | kvm_arch_vcpu_unblocking(vcpu); | |
2188 | out: | |
2189 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); | |
2190 | ||
2191 | if (!vcpu_valid_wakeup(vcpu)) | |
2192 | shrink_halt_poll_ns(vcpu); | |
2193 | else if (halt_poll_ns) { | |
2194 | if (block_ns <= vcpu->halt_poll_ns) | |
2195 | ; | |
2196 | /* we had a long block, shrink polling */ | |
2197 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) | |
2198 | shrink_halt_poll_ns(vcpu); | |
2199 | /* we had a short halt and our poll time is too small */ | |
2200 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2201 | block_ns < halt_poll_ns) | |
2202 | grow_halt_poll_ns(vcpu); | |
2203 | } else | |
2204 | vcpu->halt_poll_ns = 0; | |
2205 | ||
2206 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); | |
2207 | kvm_arch_vcpu_block_finish(vcpu); | |
2208 | } | |
2209 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); | |
2210 | ||
2211 | #ifndef CONFIG_S390 | |
2212 | void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) | |
2213 | { | |
2214 | struct swait_queue_head *wqp; | |
2215 | ||
2216 | wqp = kvm_arch_vcpu_wq(vcpu); | |
2217 | if (swait_active(wqp)) { | |
2218 | swake_up(wqp); | |
2219 | ++vcpu->stat.halt_wakeup; | |
2220 | } | |
2221 | ||
2222 | } | |
2223 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2224 | ||
2225 | /* | |
2226 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2227 | */ | |
2228 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2229 | { | |
2230 | int me; | |
2231 | int cpu = vcpu->cpu; | |
2232 | ||
2233 | kvm_vcpu_wake_up(vcpu); | |
2234 | me = get_cpu(); | |
2235 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2236 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2237 | smp_send_reschedule(cpu); | |
2238 | put_cpu(); | |
2239 | } | |
2240 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); | |
2241 | #endif /* !CONFIG_S390 */ | |
2242 | ||
2243 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) | |
2244 | { | |
2245 | struct pid *pid; | |
2246 | struct task_struct *task = NULL; | |
2247 | int ret = 0; | |
2248 | ||
2249 | rcu_read_lock(); | |
2250 | pid = rcu_dereference(target->pid); | |
2251 | if (pid) | |
2252 | task = get_pid_task(pid, PIDTYPE_PID); | |
2253 | rcu_read_unlock(); | |
2254 | if (!task) | |
2255 | return ret; | |
2256 | ret = yield_to(task, 1); | |
2257 | put_task_struct(task); | |
2258 | ||
2259 | return ret; | |
2260 | } | |
2261 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2262 | ||
2263 | /* | |
2264 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2265 | * Most eligible candidate to yield is decided by following heuristics: | |
2266 | * | |
2267 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2268 | * (preempted lock holder), indicated by @in_spin_loop. | |
2269 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2270 | * | |
2271 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2272 | * chance last time (mostly it has become eligible now since we have probably | |
2273 | * yielded to lockholder in last iteration. This is done by toggling | |
2274 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2275 | * | |
2276 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2277 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2278 | * burning. Giving priority for a potential lock-holder increases lock | |
2279 | * progress. | |
2280 | * | |
2281 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2282 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2283 | * and continue with next VCPU and so on. | |
2284 | */ | |
2285 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) | |
2286 | { | |
2287 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT | |
2288 | bool eligible; | |
2289 | ||
2290 | eligible = !vcpu->spin_loop.in_spin_loop || | |
2291 | vcpu->spin_loop.dy_eligible; | |
2292 | ||
2293 | if (vcpu->spin_loop.in_spin_loop) | |
2294 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2295 | ||
2296 | return eligible; | |
2297 | #else | |
2298 | return true; | |
2299 | #endif | |
2300 | } | |
2301 | ||
2302 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) | |
2303 | { | |
2304 | struct kvm *kvm = me->kvm; | |
2305 | struct kvm_vcpu *vcpu; | |
2306 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2307 | int yielded = 0; | |
2308 | int try = 3; | |
2309 | int pass; | |
2310 | int i; | |
2311 | ||
2312 | kvm_vcpu_set_in_spin_loop(me, true); | |
2313 | /* | |
2314 | * We boost the priority of a VCPU that is runnable but not | |
2315 | * currently running, because it got preempted by something | |
2316 | * else and called schedule in __vcpu_run. Hopefully that | |
2317 | * VCPU is holding the lock that we need and will release it. | |
2318 | * We approximate round-robin by starting at the last boosted VCPU. | |
2319 | */ | |
2320 | for (pass = 0; pass < 2 && !yielded && try; pass++) { | |
2321 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
2322 | if (!pass && i <= last_boosted_vcpu) { | |
2323 | i = last_boosted_vcpu; | |
2324 | continue; | |
2325 | } else if (pass && i > last_boosted_vcpu) | |
2326 | break; | |
2327 | if (!ACCESS_ONCE(vcpu->preempted)) | |
2328 | continue; | |
2329 | if (vcpu == me) | |
2330 | continue; | |
2331 | if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) | |
2332 | continue; | |
2333 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) | |
2334 | continue; | |
2335 | ||
2336 | yielded = kvm_vcpu_yield_to(vcpu); | |
2337 | if (yielded > 0) { | |
2338 | kvm->last_boosted_vcpu = i; | |
2339 | break; | |
2340 | } else if (yielded < 0) { | |
2341 | try--; | |
2342 | if (!try) | |
2343 | break; | |
2344 | } | |
2345 | } | |
2346 | } | |
2347 | kvm_vcpu_set_in_spin_loop(me, false); | |
2348 | ||
2349 | /* Ensure vcpu is not eligible during next spinloop */ | |
2350 | kvm_vcpu_set_dy_eligible(me, false); | |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2353 | ||
2354 | static int kvm_vcpu_fault(struct vm_fault *vmf) | |
2355 | { | |
2356 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; | |
2357 | struct page *page; | |
2358 | ||
2359 | if (vmf->pgoff == 0) | |
2360 | page = virt_to_page(vcpu->run); | |
2361 | #ifdef CONFIG_X86 | |
2362 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) | |
2363 | page = virt_to_page(vcpu->arch.pio_data); | |
2364 | #endif | |
2365 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2366 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
2367 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
2368 | #endif | |
2369 | else | |
2370 | return kvm_arch_vcpu_fault(vcpu, vmf); | |
2371 | get_page(page); | |
2372 | vmf->page = page; | |
2373 | return 0; | |
2374 | } | |
2375 | ||
2376 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { | |
2377 | .fault = kvm_vcpu_fault, | |
2378 | }; | |
2379 | ||
2380 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2381 | { | |
2382 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) | |
2387 | { | |
2388 | struct kvm_vcpu *vcpu = filp->private_data; | |
2389 | ||
2390 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2391 | kvm_put_kvm(vcpu->kvm); | |
2392 | return 0; | |
2393 | } | |
2394 | ||
2395 | static struct file_operations kvm_vcpu_fops = { | |
2396 | .release = kvm_vcpu_release, | |
2397 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
2398 | #ifdef CONFIG_KVM_COMPAT | |
2399 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
2400 | #endif | |
2401 | .mmap = kvm_vcpu_mmap, | |
2402 | .llseek = noop_llseek, | |
2403 | }; | |
2404 | ||
2405 | /* | |
2406 | * Allocates an inode for the vcpu. | |
2407 | */ | |
2408 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2409 | { | |
2410 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
2411 | } | |
2412 | ||
2413 | static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) | |
2414 | { | |
2415 | char dir_name[ITOA_MAX_LEN * 2]; | |
2416 | int ret; | |
2417 | ||
2418 | if (!kvm_arch_has_vcpu_debugfs()) | |
2419 | return 0; | |
2420 | ||
2421 | if (!debugfs_initialized()) | |
2422 | return 0; | |
2423 | ||
2424 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2425 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
2426 | vcpu->kvm->debugfs_dentry); | |
2427 | if (!vcpu->debugfs_dentry) | |
2428 | return -ENOMEM; | |
2429 | ||
2430 | ret = kvm_arch_create_vcpu_debugfs(vcpu); | |
2431 | if (ret < 0) { | |
2432 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2433 | return ret; | |
2434 | } | |
2435 | ||
2436 | return 0; | |
2437 | } | |
2438 | ||
2439 | /* | |
2440 | * Creates some virtual cpus. Good luck creating more than one. | |
2441 | */ | |
2442 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) | |
2443 | { | |
2444 | int r; | |
2445 | struct kvm_vcpu *vcpu; | |
2446 | ||
2447 | if (id >= KVM_MAX_VCPU_ID) | |
2448 | return -EINVAL; | |
2449 | ||
2450 | mutex_lock(&kvm->lock); | |
2451 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2452 | mutex_unlock(&kvm->lock); | |
2453 | return -EINVAL; | |
2454 | } | |
2455 | ||
2456 | kvm->created_vcpus++; | |
2457 | mutex_unlock(&kvm->lock); | |
2458 | ||
2459 | vcpu = kvm_arch_vcpu_create(kvm, id); | |
2460 | if (IS_ERR(vcpu)) { | |
2461 | r = PTR_ERR(vcpu); | |
2462 | goto vcpu_decrement; | |
2463 | } | |
2464 | ||
2465 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); | |
2466 | ||
2467 | r = kvm_arch_vcpu_setup(vcpu); | |
2468 | if (r) | |
2469 | goto vcpu_destroy; | |
2470 | ||
2471 | r = kvm_create_vcpu_debugfs(vcpu); | |
2472 | if (r) | |
2473 | goto vcpu_destroy; | |
2474 | ||
2475 | mutex_lock(&kvm->lock); | |
2476 | if (kvm_get_vcpu_by_id(kvm, id)) { | |
2477 | r = -EEXIST; | |
2478 | goto unlock_vcpu_destroy; | |
2479 | } | |
2480 | ||
2481 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
2482 | ||
2483 | /* Now it's all set up, let userspace reach it */ | |
2484 | kvm_get_kvm(kvm); | |
2485 | r = create_vcpu_fd(vcpu); | |
2486 | if (r < 0) { | |
2487 | kvm_put_kvm(kvm); | |
2488 | goto unlock_vcpu_destroy; | |
2489 | } | |
2490 | ||
2491 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
2492 | ||
2493 | /* | |
2494 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2495 | * before kvm->online_vcpu's incremented value. | |
2496 | */ | |
2497 | smp_wmb(); | |
2498 | atomic_inc(&kvm->online_vcpus); | |
2499 | ||
2500 | mutex_unlock(&kvm->lock); | |
2501 | kvm_arch_vcpu_postcreate(vcpu); | |
2502 | return r; | |
2503 | ||
2504 | unlock_vcpu_destroy: | |
2505 | mutex_unlock(&kvm->lock); | |
2506 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2507 | vcpu_destroy: | |
2508 | kvm_arch_vcpu_destroy(vcpu); | |
2509 | vcpu_decrement: | |
2510 | mutex_lock(&kvm->lock); | |
2511 | kvm->created_vcpus--; | |
2512 | mutex_unlock(&kvm->lock); | |
2513 | return r; | |
2514 | } | |
2515 | ||
2516 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) | |
2517 | { | |
2518 | if (sigset) { | |
2519 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2520 | vcpu->sigset_active = 1; | |
2521 | vcpu->sigset = *sigset; | |
2522 | } else | |
2523 | vcpu->sigset_active = 0; | |
2524 | return 0; | |
2525 | } | |
2526 | ||
2527 | static long kvm_vcpu_ioctl(struct file *filp, | |
2528 | unsigned int ioctl, unsigned long arg) | |
2529 | { | |
2530 | struct kvm_vcpu *vcpu = filp->private_data; | |
2531 | void __user *argp = (void __user *)arg; | |
2532 | int r; | |
2533 | struct kvm_fpu *fpu = NULL; | |
2534 | struct kvm_sregs *kvm_sregs = NULL; | |
2535 | ||
2536 | if (vcpu->kvm->mm != current->mm) | |
2537 | return -EIO; | |
2538 | ||
2539 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) | |
2540 | return -EINVAL; | |
2541 | ||
2542 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) | |
2543 | /* | |
2544 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
2545 | * so vcpu_load() would break it. | |
2546 | */ | |
2547 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT) | |
2548 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
2549 | #endif | |
2550 | ||
2551 | ||
2552 | r = vcpu_load(vcpu); | |
2553 | if (r) | |
2554 | return r; | |
2555 | switch (ioctl) { | |
2556 | case KVM_RUN: | |
2557 | r = -EINVAL; | |
2558 | if (arg) | |
2559 | goto out; | |
2560 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { | |
2561 | /* The thread running this VCPU changed. */ | |
2562 | struct pid *oldpid = vcpu->pid; | |
2563 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
2564 | ||
2565 | rcu_assign_pointer(vcpu->pid, newpid); | |
2566 | if (oldpid) | |
2567 | synchronize_rcu(); | |
2568 | put_pid(oldpid); | |
2569 | } | |
2570 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); | |
2571 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); | |
2572 | break; | |
2573 | case KVM_GET_REGS: { | |
2574 | struct kvm_regs *kvm_regs; | |
2575 | ||
2576 | r = -ENOMEM; | |
2577 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2578 | if (!kvm_regs) | |
2579 | goto out; | |
2580 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); | |
2581 | if (r) | |
2582 | goto out_free1; | |
2583 | r = -EFAULT; | |
2584 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) | |
2585 | goto out_free1; | |
2586 | r = 0; | |
2587 | out_free1: | |
2588 | kfree(kvm_regs); | |
2589 | break; | |
2590 | } | |
2591 | case KVM_SET_REGS: { | |
2592 | struct kvm_regs *kvm_regs; | |
2593 | ||
2594 | r = -ENOMEM; | |
2595 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); | |
2596 | if (IS_ERR(kvm_regs)) { | |
2597 | r = PTR_ERR(kvm_regs); | |
2598 | goto out; | |
2599 | } | |
2600 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
2601 | kfree(kvm_regs); | |
2602 | break; | |
2603 | } | |
2604 | case KVM_GET_SREGS: { | |
2605 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); | |
2606 | r = -ENOMEM; | |
2607 | if (!kvm_sregs) | |
2608 | goto out; | |
2609 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
2610 | if (r) | |
2611 | goto out; | |
2612 | r = -EFAULT; | |
2613 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) | |
2614 | goto out; | |
2615 | r = 0; | |
2616 | break; | |
2617 | } | |
2618 | case KVM_SET_SREGS: { | |
2619 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); | |
2620 | if (IS_ERR(kvm_sregs)) { | |
2621 | r = PTR_ERR(kvm_sregs); | |
2622 | kvm_sregs = NULL; | |
2623 | goto out; | |
2624 | } | |
2625 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); | |
2626 | break; | |
2627 | } | |
2628 | case KVM_GET_MP_STATE: { | |
2629 | struct kvm_mp_state mp_state; | |
2630 | ||
2631 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2632 | if (r) | |
2633 | goto out; | |
2634 | r = -EFAULT; | |
2635 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) | |
2636 | goto out; | |
2637 | r = 0; | |
2638 | break; | |
2639 | } | |
2640 | case KVM_SET_MP_STATE: { | |
2641 | struct kvm_mp_state mp_state; | |
2642 | ||
2643 | r = -EFAULT; | |
2644 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) | |
2645 | goto out; | |
2646 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
2647 | break; | |
2648 | } | |
2649 | case KVM_TRANSLATE: { | |
2650 | struct kvm_translation tr; | |
2651 | ||
2652 | r = -EFAULT; | |
2653 | if (copy_from_user(&tr, argp, sizeof(tr))) | |
2654 | goto out; | |
2655 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); | |
2656 | if (r) | |
2657 | goto out; | |
2658 | r = -EFAULT; | |
2659 | if (copy_to_user(argp, &tr, sizeof(tr))) | |
2660 | goto out; | |
2661 | r = 0; | |
2662 | break; | |
2663 | } | |
2664 | case KVM_SET_GUEST_DEBUG: { | |
2665 | struct kvm_guest_debug dbg; | |
2666 | ||
2667 | r = -EFAULT; | |
2668 | if (copy_from_user(&dbg, argp, sizeof(dbg))) | |
2669 | goto out; | |
2670 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); | |
2671 | break; | |
2672 | } | |
2673 | case KVM_SET_SIGNAL_MASK: { | |
2674 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2675 | struct kvm_signal_mask kvm_sigmask; | |
2676 | sigset_t sigset, *p; | |
2677 | ||
2678 | p = NULL; | |
2679 | if (argp) { | |
2680 | r = -EFAULT; | |
2681 | if (copy_from_user(&kvm_sigmask, argp, | |
2682 | sizeof(kvm_sigmask))) | |
2683 | goto out; | |
2684 | r = -EINVAL; | |
2685 | if (kvm_sigmask.len != sizeof(sigset)) | |
2686 | goto out; | |
2687 | r = -EFAULT; | |
2688 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
2689 | sizeof(sigset))) | |
2690 | goto out; | |
2691 | p = &sigset; | |
2692 | } | |
2693 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); | |
2694 | break; | |
2695 | } | |
2696 | case KVM_GET_FPU: { | |
2697 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); | |
2698 | r = -ENOMEM; | |
2699 | if (!fpu) | |
2700 | goto out; | |
2701 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
2702 | if (r) | |
2703 | goto out; | |
2704 | r = -EFAULT; | |
2705 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) | |
2706 | goto out; | |
2707 | r = 0; | |
2708 | break; | |
2709 | } | |
2710 | case KVM_SET_FPU: { | |
2711 | fpu = memdup_user(argp, sizeof(*fpu)); | |
2712 | if (IS_ERR(fpu)) { | |
2713 | r = PTR_ERR(fpu); | |
2714 | fpu = NULL; | |
2715 | goto out; | |
2716 | } | |
2717 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); | |
2718 | break; | |
2719 | } | |
2720 | default: | |
2721 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
2722 | } | |
2723 | out: | |
2724 | vcpu_put(vcpu); | |
2725 | kfree(fpu); | |
2726 | kfree(kvm_sregs); | |
2727 | return r; | |
2728 | } | |
2729 | ||
2730 | #ifdef CONFIG_KVM_COMPAT | |
2731 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
2732 | unsigned int ioctl, unsigned long arg) | |
2733 | { | |
2734 | struct kvm_vcpu *vcpu = filp->private_data; | |
2735 | void __user *argp = compat_ptr(arg); | |
2736 | int r; | |
2737 | ||
2738 | if (vcpu->kvm->mm != current->mm) | |
2739 | return -EIO; | |
2740 | ||
2741 | switch (ioctl) { | |
2742 | case KVM_SET_SIGNAL_MASK: { | |
2743 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2744 | struct kvm_signal_mask kvm_sigmask; | |
2745 | compat_sigset_t csigset; | |
2746 | sigset_t sigset; | |
2747 | ||
2748 | if (argp) { | |
2749 | r = -EFAULT; | |
2750 | if (copy_from_user(&kvm_sigmask, argp, | |
2751 | sizeof(kvm_sigmask))) | |
2752 | goto out; | |
2753 | r = -EINVAL; | |
2754 | if (kvm_sigmask.len != sizeof(csigset)) | |
2755 | goto out; | |
2756 | r = -EFAULT; | |
2757 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
2758 | sizeof(csigset))) | |
2759 | goto out; | |
2760 | sigset_from_compat(&sigset, &csigset); | |
2761 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2762 | } else | |
2763 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
2764 | break; | |
2765 | } | |
2766 | default: | |
2767 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2768 | } | |
2769 | ||
2770 | out: | |
2771 | return r; | |
2772 | } | |
2773 | #endif | |
2774 | ||
2775 | static int kvm_device_ioctl_attr(struct kvm_device *dev, | |
2776 | int (*accessor)(struct kvm_device *dev, | |
2777 | struct kvm_device_attr *attr), | |
2778 | unsigned long arg) | |
2779 | { | |
2780 | struct kvm_device_attr attr; | |
2781 | ||
2782 | if (!accessor) | |
2783 | return -EPERM; | |
2784 | ||
2785 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2786 | return -EFAULT; | |
2787 | ||
2788 | return accessor(dev, &attr); | |
2789 | } | |
2790 | ||
2791 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2792 | unsigned long arg) | |
2793 | { | |
2794 | struct kvm_device *dev = filp->private_data; | |
2795 | ||
2796 | switch (ioctl) { | |
2797 | case KVM_SET_DEVICE_ATTR: | |
2798 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2799 | case KVM_GET_DEVICE_ATTR: | |
2800 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2801 | case KVM_HAS_DEVICE_ATTR: | |
2802 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2803 | default: | |
2804 | if (dev->ops->ioctl) | |
2805 | return dev->ops->ioctl(dev, ioctl, arg); | |
2806 | ||
2807 | return -ENOTTY; | |
2808 | } | |
2809 | } | |
2810 | ||
2811 | static int kvm_device_release(struct inode *inode, struct file *filp) | |
2812 | { | |
2813 | struct kvm_device *dev = filp->private_data; | |
2814 | struct kvm *kvm = dev->kvm; | |
2815 | ||
2816 | kvm_put_kvm(kvm); | |
2817 | return 0; | |
2818 | } | |
2819 | ||
2820 | static const struct file_operations kvm_device_fops = { | |
2821 | .unlocked_ioctl = kvm_device_ioctl, | |
2822 | #ifdef CONFIG_KVM_COMPAT | |
2823 | .compat_ioctl = kvm_device_ioctl, | |
2824 | #endif | |
2825 | .release = kvm_device_release, | |
2826 | }; | |
2827 | ||
2828 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2829 | { | |
2830 | if (filp->f_op != &kvm_device_fops) | |
2831 | return NULL; | |
2832 | ||
2833 | return filp->private_data; | |
2834 | } | |
2835 | ||
2836 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { | |
2837 | #ifdef CONFIG_KVM_MPIC | |
2838 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, | |
2839 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
2840 | #endif | |
2841 | ||
2842 | #ifdef CONFIG_KVM_XICS | |
2843 | [KVM_DEV_TYPE_XICS] = &kvm_xics_ops, | |
2844 | #endif | |
2845 | }; | |
2846 | ||
2847 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2848 | { | |
2849 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2850 | return -ENOSPC; | |
2851 | ||
2852 | if (kvm_device_ops_table[type] != NULL) | |
2853 | return -EEXIST; | |
2854 | ||
2855 | kvm_device_ops_table[type] = ops; | |
2856 | return 0; | |
2857 | } | |
2858 | ||
2859 | void kvm_unregister_device_ops(u32 type) | |
2860 | { | |
2861 | if (kvm_device_ops_table[type] != NULL) | |
2862 | kvm_device_ops_table[type] = NULL; | |
2863 | } | |
2864 | ||
2865 | static int kvm_ioctl_create_device(struct kvm *kvm, | |
2866 | struct kvm_create_device *cd) | |
2867 | { | |
2868 | struct kvm_device_ops *ops = NULL; | |
2869 | struct kvm_device *dev; | |
2870 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2871 | int ret; | |
2872 | ||
2873 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2874 | return -ENODEV; | |
2875 | ||
2876 | ops = kvm_device_ops_table[cd->type]; | |
2877 | if (ops == NULL) | |
2878 | return -ENODEV; | |
2879 | ||
2880 | if (test) | |
2881 | return 0; | |
2882 | ||
2883 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2884 | if (!dev) | |
2885 | return -ENOMEM; | |
2886 | ||
2887 | dev->ops = ops; | |
2888 | dev->kvm = kvm; | |
2889 | ||
2890 | mutex_lock(&kvm->lock); | |
2891 | ret = ops->create(dev, cd->type); | |
2892 | if (ret < 0) { | |
2893 | mutex_unlock(&kvm->lock); | |
2894 | kfree(dev); | |
2895 | return ret; | |
2896 | } | |
2897 | list_add(&dev->vm_node, &kvm->devices); | |
2898 | mutex_unlock(&kvm->lock); | |
2899 | ||
2900 | if (ops->init) | |
2901 | ops->init(dev); | |
2902 | ||
2903 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); | |
2904 | if (ret < 0) { | |
2905 | mutex_lock(&kvm->lock); | |
2906 | list_del(&dev->vm_node); | |
2907 | mutex_unlock(&kvm->lock); | |
2908 | ops->destroy(dev); | |
2909 | return ret; | |
2910 | } | |
2911 | ||
2912 | kvm_get_kvm(kvm); | |
2913 | cd->fd = ret; | |
2914 | return 0; | |
2915 | } | |
2916 | ||
2917 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) | |
2918 | { | |
2919 | switch (arg) { | |
2920 | case KVM_CAP_USER_MEMORY: | |
2921 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
2922 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
2923 | case KVM_CAP_INTERNAL_ERROR_DATA: | |
2924 | #ifdef CONFIG_HAVE_KVM_MSI | |
2925 | case KVM_CAP_SIGNAL_MSI: | |
2926 | #endif | |
2927 | #ifdef CONFIG_HAVE_KVM_IRQFD | |
2928 | case KVM_CAP_IRQFD: | |
2929 | case KVM_CAP_IRQFD_RESAMPLE: | |
2930 | #endif | |
2931 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: | |
2932 | case KVM_CAP_CHECK_EXTENSION_VM: | |
2933 | return 1; | |
2934 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
2935 | case KVM_CAP_IRQ_ROUTING: | |
2936 | return KVM_MAX_IRQ_ROUTES; | |
2937 | #endif | |
2938 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
2939 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
2940 | return KVM_ADDRESS_SPACE_NUM; | |
2941 | #endif | |
2942 | case KVM_CAP_MAX_VCPU_ID: | |
2943 | return KVM_MAX_VCPU_ID; | |
2944 | default: | |
2945 | break; | |
2946 | } | |
2947 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
2948 | } | |
2949 | ||
2950 | static long kvm_vm_ioctl(struct file *filp, | |
2951 | unsigned int ioctl, unsigned long arg) | |
2952 | { | |
2953 | struct kvm *kvm = filp->private_data; | |
2954 | void __user *argp = (void __user *)arg; | |
2955 | int r; | |
2956 | ||
2957 | if (kvm->mm != current->mm) | |
2958 | return -EIO; | |
2959 | switch (ioctl) { | |
2960 | case KVM_CREATE_VCPU: | |
2961 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
2962 | break; | |
2963 | case KVM_SET_USER_MEMORY_REGION: { | |
2964 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2965 | ||
2966 | r = -EFAULT; | |
2967 | if (copy_from_user(&kvm_userspace_mem, argp, | |
2968 | sizeof(kvm_userspace_mem))) | |
2969 | goto out; | |
2970 | ||
2971 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); | |
2972 | break; | |
2973 | } | |
2974 | case KVM_GET_DIRTY_LOG: { | |
2975 | struct kvm_dirty_log log; | |
2976 | ||
2977 | r = -EFAULT; | |
2978 | if (copy_from_user(&log, argp, sizeof(log))) | |
2979 | goto out; | |
2980 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
2981 | break; | |
2982 | } | |
2983 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2984 | case KVM_REGISTER_COALESCED_MMIO: { | |
2985 | struct kvm_coalesced_mmio_zone zone; | |
2986 | ||
2987 | r = -EFAULT; | |
2988 | if (copy_from_user(&zone, argp, sizeof(zone))) | |
2989 | goto out; | |
2990 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); | |
2991 | break; | |
2992 | } | |
2993 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2994 | struct kvm_coalesced_mmio_zone zone; | |
2995 | ||
2996 | r = -EFAULT; | |
2997 | if (copy_from_user(&zone, argp, sizeof(zone))) | |
2998 | goto out; | |
2999 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); | |
3000 | break; | |
3001 | } | |
3002 | #endif | |
3003 | case KVM_IRQFD: { | |
3004 | struct kvm_irqfd data; | |
3005 | ||
3006 | r = -EFAULT; | |
3007 | if (copy_from_user(&data, argp, sizeof(data))) | |
3008 | goto out; | |
3009 | r = kvm_irqfd(kvm, &data); | |
3010 | break; | |
3011 | } | |
3012 | case KVM_IOEVENTFD: { | |
3013 | struct kvm_ioeventfd data; | |
3014 | ||
3015 | r = -EFAULT; | |
3016 | if (copy_from_user(&data, argp, sizeof(data))) | |
3017 | goto out; | |
3018 | r = kvm_ioeventfd(kvm, &data); | |
3019 | break; | |
3020 | } | |
3021 | #ifdef CONFIG_HAVE_KVM_MSI | |
3022 | case KVM_SIGNAL_MSI: { | |
3023 | struct kvm_msi msi; | |
3024 | ||
3025 | r = -EFAULT; | |
3026 | if (copy_from_user(&msi, argp, sizeof(msi))) | |
3027 | goto out; | |
3028 | r = kvm_send_userspace_msi(kvm, &msi); | |
3029 | break; | |
3030 | } | |
3031 | #endif | |
3032 | #ifdef __KVM_HAVE_IRQ_LINE | |
3033 | case KVM_IRQ_LINE_STATUS: | |
3034 | case KVM_IRQ_LINE: { | |
3035 | struct kvm_irq_level irq_event; | |
3036 | ||
3037 | r = -EFAULT; | |
3038 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) | |
3039 | goto out; | |
3040 | ||
3041 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, | |
3042 | ioctl == KVM_IRQ_LINE_STATUS); | |
3043 | if (r) | |
3044 | goto out; | |
3045 | ||
3046 | r = -EFAULT; | |
3047 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
3048 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) | |
3049 | goto out; | |
3050 | } | |
3051 | ||
3052 | r = 0; | |
3053 | break; | |
3054 | } | |
3055 | #endif | |
3056 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
3057 | case KVM_SET_GSI_ROUTING: { | |
3058 | struct kvm_irq_routing routing; | |
3059 | struct kvm_irq_routing __user *urouting; | |
3060 | struct kvm_irq_routing_entry *entries = NULL; | |
3061 | ||
3062 | r = -EFAULT; | |
3063 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3064 | goto out; | |
3065 | r = -EINVAL; | |
3066 | if (routing.nr > KVM_MAX_IRQ_ROUTES) | |
3067 | goto out; | |
3068 | if (routing.flags) | |
3069 | goto out; | |
3070 | if (routing.nr) { | |
3071 | r = -ENOMEM; | |
3072 | entries = vmalloc(routing.nr * sizeof(*entries)); | |
3073 | if (!entries) | |
3074 | goto out; | |
3075 | r = -EFAULT; | |
3076 | urouting = argp; | |
3077 | if (copy_from_user(entries, urouting->entries, | |
3078 | routing.nr * sizeof(*entries))) | |
3079 | goto out_free_irq_routing; | |
3080 | } | |
3081 | r = kvm_set_irq_routing(kvm, entries, routing.nr, | |
3082 | routing.flags); | |
3083 | out_free_irq_routing: | |
3084 | vfree(entries); | |
3085 | break; | |
3086 | } | |
3087 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
3088 | case KVM_CREATE_DEVICE: { | |
3089 | struct kvm_create_device cd; | |
3090 | ||
3091 | r = -EFAULT; | |
3092 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3093 | goto out; | |
3094 | ||
3095 | r = kvm_ioctl_create_device(kvm, &cd); | |
3096 | if (r) | |
3097 | goto out; | |
3098 | ||
3099 | r = -EFAULT; | |
3100 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3101 | goto out; | |
3102 | ||
3103 | r = 0; | |
3104 | break; | |
3105 | } | |
3106 | case KVM_CHECK_EXTENSION: | |
3107 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3108 | break; | |
3109 | default: | |
3110 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); | |
3111 | } | |
3112 | out: | |
3113 | return r; | |
3114 | } | |
3115 | ||
3116 | #ifdef CONFIG_KVM_COMPAT | |
3117 | struct compat_kvm_dirty_log { | |
3118 | __u32 slot; | |
3119 | __u32 padding1; | |
3120 | union { | |
3121 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3122 | __u64 padding2; | |
3123 | }; | |
3124 | }; | |
3125 | ||
3126 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3127 | unsigned int ioctl, unsigned long arg) | |
3128 | { | |
3129 | struct kvm *kvm = filp->private_data; | |
3130 | int r; | |
3131 | ||
3132 | if (kvm->mm != current->mm) | |
3133 | return -EIO; | |
3134 | switch (ioctl) { | |
3135 | case KVM_GET_DIRTY_LOG: { | |
3136 | struct compat_kvm_dirty_log compat_log; | |
3137 | struct kvm_dirty_log log; | |
3138 | ||
3139 | if (copy_from_user(&compat_log, (void __user *)arg, | |
3140 | sizeof(compat_log))) | |
3141 | return -EFAULT; | |
3142 | log.slot = compat_log.slot; | |
3143 | log.padding1 = compat_log.padding1; | |
3144 | log.padding2 = compat_log.padding2; | |
3145 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3146 | ||
3147 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
3148 | break; | |
3149 | } | |
3150 | default: | |
3151 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3152 | } | |
3153 | return r; | |
3154 | } | |
3155 | #endif | |
3156 | ||
3157 | static struct file_operations kvm_vm_fops = { | |
3158 | .release = kvm_vm_release, | |
3159 | .unlocked_ioctl = kvm_vm_ioctl, | |
3160 | #ifdef CONFIG_KVM_COMPAT | |
3161 | .compat_ioctl = kvm_vm_compat_ioctl, | |
3162 | #endif | |
3163 | .llseek = noop_llseek, | |
3164 | }; | |
3165 | ||
3166 | static int kvm_dev_ioctl_create_vm(unsigned long type) | |
3167 | { | |
3168 | int r; | |
3169 | struct kvm *kvm; | |
3170 | struct file *file; | |
3171 | ||
3172 | kvm = kvm_create_vm(type); | |
3173 | if (IS_ERR(kvm)) | |
3174 | return PTR_ERR(kvm); | |
3175 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
3176 | r = kvm_coalesced_mmio_init(kvm); | |
3177 | if (r < 0) { | |
3178 | kvm_put_kvm(kvm); | |
3179 | return r; | |
3180 | } | |
3181 | #endif | |
3182 | r = get_unused_fd_flags(O_CLOEXEC); | |
3183 | if (r < 0) { | |
3184 | kvm_put_kvm(kvm); | |
3185 | return r; | |
3186 | } | |
3187 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); | |
3188 | if (IS_ERR(file)) { | |
3189 | put_unused_fd(r); | |
3190 | kvm_put_kvm(kvm); | |
3191 | return PTR_ERR(file); | |
3192 | } | |
3193 | ||
3194 | if (kvm_create_vm_debugfs(kvm, r) < 0) { | |
3195 | put_unused_fd(r); | |
3196 | fput(file); | |
3197 | return -ENOMEM; | |
3198 | } | |
3199 | ||
3200 | fd_install(r, file); | |
3201 | return r; | |
3202 | } | |
3203 | ||
3204 | static long kvm_dev_ioctl(struct file *filp, | |
3205 | unsigned int ioctl, unsigned long arg) | |
3206 | { | |
3207 | long r = -EINVAL; | |
3208 | ||
3209 | switch (ioctl) { | |
3210 | case KVM_GET_API_VERSION: | |
3211 | if (arg) | |
3212 | goto out; | |
3213 | r = KVM_API_VERSION; | |
3214 | break; | |
3215 | case KVM_CREATE_VM: | |
3216 | r = kvm_dev_ioctl_create_vm(arg); | |
3217 | break; | |
3218 | case KVM_CHECK_EXTENSION: | |
3219 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); | |
3220 | break; | |
3221 | case KVM_GET_VCPU_MMAP_SIZE: | |
3222 | if (arg) | |
3223 | goto out; | |
3224 | r = PAGE_SIZE; /* struct kvm_run */ | |
3225 | #ifdef CONFIG_X86 | |
3226 | r += PAGE_SIZE; /* pio data page */ | |
3227 | #endif | |
3228 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
3229 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
3230 | #endif | |
3231 | break; | |
3232 | case KVM_TRACE_ENABLE: | |
3233 | case KVM_TRACE_PAUSE: | |
3234 | case KVM_TRACE_DISABLE: | |
3235 | r = -EOPNOTSUPP; | |
3236 | break; | |
3237 | default: | |
3238 | return kvm_arch_dev_ioctl(filp, ioctl, arg); | |
3239 | } | |
3240 | out: | |
3241 | return r; | |
3242 | } | |
3243 | ||
3244 | static struct file_operations kvm_chardev_ops = { | |
3245 | .unlocked_ioctl = kvm_dev_ioctl, | |
3246 | .compat_ioctl = kvm_dev_ioctl, | |
3247 | .llseek = noop_llseek, | |
3248 | }; | |
3249 | ||
3250 | static struct miscdevice kvm_dev = { | |
3251 | KVM_MINOR, | |
3252 | "kvm", | |
3253 | &kvm_chardev_ops, | |
3254 | }; | |
3255 | ||
3256 | static void hardware_enable_nolock(void *junk) | |
3257 | { | |
3258 | int cpu = raw_smp_processor_id(); | |
3259 | int r; | |
3260 | ||
3261 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) | |
3262 | return; | |
3263 | ||
3264 | cpumask_set_cpu(cpu, cpus_hardware_enabled); | |
3265 | ||
3266 | r = kvm_arch_hardware_enable(); | |
3267 | ||
3268 | if (r) { | |
3269 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3270 | atomic_inc(&hardware_enable_failed); | |
3271 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); | |
3272 | } | |
3273 | } | |
3274 | ||
3275 | static int kvm_starting_cpu(unsigned int cpu) | |
3276 | { | |
3277 | raw_spin_lock(&kvm_count_lock); | |
3278 | if (kvm_usage_count) | |
3279 | hardware_enable_nolock(NULL); | |
3280 | raw_spin_unlock(&kvm_count_lock); | |
3281 | return 0; | |
3282 | } | |
3283 | ||
3284 | static void hardware_disable_nolock(void *junk) | |
3285 | { | |
3286 | int cpu = raw_smp_processor_id(); | |
3287 | ||
3288 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) | |
3289 | return; | |
3290 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3291 | kvm_arch_hardware_disable(); | |
3292 | } | |
3293 | ||
3294 | static int kvm_dying_cpu(unsigned int cpu) | |
3295 | { | |
3296 | raw_spin_lock(&kvm_count_lock); | |
3297 | if (kvm_usage_count) | |
3298 | hardware_disable_nolock(NULL); | |
3299 | raw_spin_unlock(&kvm_count_lock); | |
3300 | return 0; | |
3301 | } | |
3302 | ||
3303 | static void hardware_disable_all_nolock(void) | |
3304 | { | |
3305 | BUG_ON(!kvm_usage_count); | |
3306 | ||
3307 | kvm_usage_count--; | |
3308 | if (!kvm_usage_count) | |
3309 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
3310 | } | |
3311 | ||
3312 | static void hardware_disable_all(void) | |
3313 | { | |
3314 | raw_spin_lock(&kvm_count_lock); | |
3315 | hardware_disable_all_nolock(); | |
3316 | raw_spin_unlock(&kvm_count_lock); | |
3317 | } | |
3318 | ||
3319 | static int hardware_enable_all(void) | |
3320 | { | |
3321 | int r = 0; | |
3322 | ||
3323 | raw_spin_lock(&kvm_count_lock); | |
3324 | ||
3325 | kvm_usage_count++; | |
3326 | if (kvm_usage_count == 1) { | |
3327 | atomic_set(&hardware_enable_failed, 0); | |
3328 | on_each_cpu(hardware_enable_nolock, NULL, 1); | |
3329 | ||
3330 | if (atomic_read(&hardware_enable_failed)) { | |
3331 | hardware_disable_all_nolock(); | |
3332 | r = -EBUSY; | |
3333 | } | |
3334 | } | |
3335 | ||
3336 | raw_spin_unlock(&kvm_count_lock); | |
3337 | ||
3338 | return r; | |
3339 | } | |
3340 | ||
3341 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, | |
3342 | void *v) | |
3343 | { | |
3344 | /* | |
3345 | * Some (well, at least mine) BIOSes hang on reboot if | |
3346 | * in vmx root mode. | |
3347 | * | |
3348 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3349 | */ | |
3350 | pr_info("kvm: exiting hardware virtualization\n"); | |
3351 | kvm_rebooting = true; | |
3352 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
3353 | return NOTIFY_OK; | |
3354 | } | |
3355 | ||
3356 | static struct notifier_block kvm_reboot_notifier = { | |
3357 | .notifier_call = kvm_reboot, | |
3358 | .priority = 0, | |
3359 | }; | |
3360 | ||
3361 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) | |
3362 | { | |
3363 | int i; | |
3364 | ||
3365 | for (i = 0; i < bus->dev_count; i++) { | |
3366 | struct kvm_io_device *pos = bus->range[i].dev; | |
3367 | ||
3368 | kvm_iodevice_destructor(pos); | |
3369 | } | |
3370 | kfree(bus); | |
3371 | } | |
3372 | ||
3373 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, | |
3374 | const struct kvm_io_range *r2) | |
3375 | { | |
3376 | gpa_t addr1 = r1->addr; | |
3377 | gpa_t addr2 = r2->addr; | |
3378 | ||
3379 | if (addr1 < addr2) | |
3380 | return -1; | |
3381 | ||
3382 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3383 | * accept any overlapping write. Any order is acceptable for | |
3384 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3385 | * we process all of them. | |
3386 | */ | |
3387 | if (r2->len) { | |
3388 | addr1 += r1->len; | |
3389 | addr2 += r2->len; | |
3390 | } | |
3391 | ||
3392 | if (addr1 > addr2) | |
3393 | return 1; | |
3394 | ||
3395 | return 0; | |
3396 | } | |
3397 | ||
3398 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) | |
3399 | { | |
3400 | return kvm_io_bus_cmp(p1, p2); | |
3401 | } | |
3402 | ||
3403 | static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, | |
3404 | gpa_t addr, int len) | |
3405 | { | |
3406 | bus->range[bus->dev_count++] = (struct kvm_io_range) { | |
3407 | .addr = addr, | |
3408 | .len = len, | |
3409 | .dev = dev, | |
3410 | }; | |
3411 | ||
3412 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
3413 | kvm_io_bus_sort_cmp, NULL); | |
3414 | ||
3415 | return 0; | |
3416 | } | |
3417 | ||
3418 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, | |
3419 | gpa_t addr, int len) | |
3420 | { | |
3421 | struct kvm_io_range *range, key; | |
3422 | int off; | |
3423 | ||
3424 | key = (struct kvm_io_range) { | |
3425 | .addr = addr, | |
3426 | .len = len, | |
3427 | }; | |
3428 | ||
3429 | range = bsearch(&key, bus->range, bus->dev_count, | |
3430 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3431 | if (range == NULL) | |
3432 | return -ENOENT; | |
3433 | ||
3434 | off = range - bus->range; | |
3435 | ||
3436 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) | |
3437 | off--; | |
3438 | ||
3439 | return off; | |
3440 | } | |
3441 | ||
3442 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, | |
3443 | struct kvm_io_range *range, const void *val) | |
3444 | { | |
3445 | int idx; | |
3446 | ||
3447 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3448 | if (idx < 0) | |
3449 | return -EOPNOTSUPP; | |
3450 | ||
3451 | while (idx < bus->dev_count && | |
3452 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { | |
3453 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, | |
3454 | range->len, val)) | |
3455 | return idx; | |
3456 | idx++; | |
3457 | } | |
3458 | ||
3459 | return -EOPNOTSUPP; | |
3460 | } | |
3461 | ||
3462 | /* kvm_io_bus_write - called under kvm->slots_lock */ | |
3463 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, | |
3464 | int len, const void *val) | |
3465 | { | |
3466 | struct kvm_io_bus *bus; | |
3467 | struct kvm_io_range range; | |
3468 | int r; | |
3469 | ||
3470 | range = (struct kvm_io_range) { | |
3471 | .addr = addr, | |
3472 | .len = len, | |
3473 | }; | |
3474 | ||
3475 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3476 | r = __kvm_io_bus_write(vcpu, bus, &range, val); | |
3477 | return r < 0 ? r : 0; | |
3478 | } | |
3479 | ||
3480 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
3481 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, | |
3482 | gpa_t addr, int len, const void *val, long cookie) | |
3483 | { | |
3484 | struct kvm_io_bus *bus; | |
3485 | struct kvm_io_range range; | |
3486 | ||
3487 | range = (struct kvm_io_range) { | |
3488 | .addr = addr, | |
3489 | .len = len, | |
3490 | }; | |
3491 | ||
3492 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3493 | ||
3494 | /* First try the device referenced by cookie. */ | |
3495 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
3496 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) | |
3497 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, | |
3498 | val)) | |
3499 | return cookie; | |
3500 | ||
3501 | /* | |
3502 | * cookie contained garbage; fall back to search and return the | |
3503 | * correct cookie value. | |
3504 | */ | |
3505 | return __kvm_io_bus_write(vcpu, bus, &range, val); | |
3506 | } | |
3507 | ||
3508 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, | |
3509 | struct kvm_io_range *range, void *val) | |
3510 | { | |
3511 | int idx; | |
3512 | ||
3513 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3514 | if (idx < 0) | |
3515 | return -EOPNOTSUPP; | |
3516 | ||
3517 | while (idx < bus->dev_count && | |
3518 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { | |
3519 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, | |
3520 | range->len, val)) | |
3521 | return idx; | |
3522 | idx++; | |
3523 | } | |
3524 | ||
3525 | return -EOPNOTSUPP; | |
3526 | } | |
3527 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); | |
3528 | ||
3529 | /* kvm_io_bus_read - called under kvm->slots_lock */ | |
3530 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, | |
3531 | int len, void *val) | |
3532 | { | |
3533 | struct kvm_io_bus *bus; | |
3534 | struct kvm_io_range range; | |
3535 | int r; | |
3536 | ||
3537 | range = (struct kvm_io_range) { | |
3538 | .addr = addr, | |
3539 | .len = len, | |
3540 | }; | |
3541 | ||
3542 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3543 | r = __kvm_io_bus_read(vcpu, bus, &range, val); | |
3544 | return r < 0 ? r : 0; | |
3545 | } | |
3546 | ||
3547 | ||
3548 | /* Caller must hold slots_lock. */ | |
3549 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, | |
3550 | int len, struct kvm_io_device *dev) | |
3551 | { | |
3552 | struct kvm_io_bus *new_bus, *bus; | |
3553 | ||
3554 | bus = kvm->buses[bus_idx]; | |
3555 | /* exclude ioeventfd which is limited by maximum fd */ | |
3556 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
3557 | return -ENOSPC; | |
3558 | ||
3559 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) * | |
3560 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3561 | if (!new_bus) | |
3562 | return -ENOMEM; | |
3563 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * | |
3564 | sizeof(struct kvm_io_range))); | |
3565 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); | |
3566 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3567 | synchronize_srcu_expedited(&kvm->srcu); | |
3568 | kfree(bus); | |
3569 | ||
3570 | return 0; | |
3571 | } | |
3572 | ||
3573 | /* Caller must hold slots_lock. */ | |
3574 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, | |
3575 | struct kvm_io_device *dev) | |
3576 | { | |
3577 | int i, r; | |
3578 | struct kvm_io_bus *new_bus, *bus; | |
3579 | ||
3580 | bus = kvm->buses[bus_idx]; | |
3581 | r = -ENOENT; | |
3582 | for (i = 0; i < bus->dev_count; i++) | |
3583 | if (bus->range[i].dev == dev) { | |
3584 | r = 0; | |
3585 | break; | |
3586 | } | |
3587 | ||
3588 | if (r) | |
3589 | return r; | |
3590 | ||
3591 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
3592 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3593 | if (!new_bus) | |
3594 | return -ENOMEM; | |
3595 | ||
3596 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3597 | new_bus->dev_count--; | |
3598 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3599 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
3600 | ||
3601 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3602 | synchronize_srcu_expedited(&kvm->srcu); | |
3603 | kfree(bus); | |
3604 | return r; | |
3605 | } | |
3606 | ||
3607 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, | |
3608 | gpa_t addr) | |
3609 | { | |
3610 | struct kvm_io_bus *bus; | |
3611 | int dev_idx, srcu_idx; | |
3612 | struct kvm_io_device *iodev = NULL; | |
3613 | ||
3614 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3615 | ||
3616 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
3617 | ||
3618 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3619 | if (dev_idx < 0) | |
3620 | goto out_unlock; | |
3621 | ||
3622 | iodev = bus->range[dev_idx].dev; | |
3623 | ||
3624 | out_unlock: | |
3625 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3626 | ||
3627 | return iodev; | |
3628 | } | |
3629 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
3630 | ||
3631 | static int kvm_debugfs_open(struct inode *inode, struct file *file, | |
3632 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
3633 | const char *fmt) | |
3634 | { | |
3635 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3636 | inode->i_private; | |
3637 | ||
3638 | /* The debugfs files are a reference to the kvm struct which | |
3639 | * is still valid when kvm_destroy_vm is called. | |
3640 | * To avoid the race between open and the removal of the debugfs | |
3641 | * directory we test against the users count. | |
3642 | */ | |
3643 | if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0)) | |
3644 | return -ENOENT; | |
3645 | ||
3646 | if (simple_attr_open(inode, file, get, set, fmt)) { | |
3647 | kvm_put_kvm(stat_data->kvm); | |
3648 | return -ENOMEM; | |
3649 | } | |
3650 | ||
3651 | return 0; | |
3652 | } | |
3653 | ||
3654 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
3655 | { | |
3656 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3657 | inode->i_private; | |
3658 | ||
3659 | simple_attr_release(inode, file); | |
3660 | kvm_put_kvm(stat_data->kvm); | |
3661 | ||
3662 | return 0; | |
3663 | } | |
3664 | ||
3665 | static int vm_stat_get_per_vm(void *data, u64 *val) | |
3666 | { | |
3667 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3668 | ||
3669 | *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset); | |
3670 | ||
3671 | return 0; | |
3672 | } | |
3673 | ||
3674 | static int vm_stat_clear_per_vm(void *data, u64 val) | |
3675 | { | |
3676 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3677 | ||
3678 | if (val) | |
3679 | return -EINVAL; | |
3680 | ||
3681 | *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0; | |
3682 | ||
3683 | return 0; | |
3684 | } | |
3685 | ||
3686 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) | |
3687 | { | |
3688 | __simple_attr_check_format("%llu\n", 0ull); | |
3689 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, | |
3690 | vm_stat_clear_per_vm, "%llu\n"); | |
3691 | } | |
3692 | ||
3693 | static const struct file_operations vm_stat_get_per_vm_fops = { | |
3694 | .owner = THIS_MODULE, | |
3695 | .open = vm_stat_get_per_vm_open, | |
3696 | .release = kvm_debugfs_release, | |
3697 | .read = simple_attr_read, | |
3698 | .write = simple_attr_write, | |
3699 | .llseek = generic_file_llseek, | |
3700 | }; | |
3701 | ||
3702 | static int vcpu_stat_get_per_vm(void *data, u64 *val) | |
3703 | { | |
3704 | int i; | |
3705 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3706 | struct kvm_vcpu *vcpu; | |
3707 | ||
3708 | *val = 0; | |
3709 | ||
3710 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3711 | *val += *(u64 *)((void *)vcpu + stat_data->offset); | |
3712 | ||
3713 | return 0; | |
3714 | } | |
3715 | ||
3716 | static int vcpu_stat_clear_per_vm(void *data, u64 val) | |
3717 | { | |
3718 | int i; | |
3719 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3720 | struct kvm_vcpu *vcpu; | |
3721 | ||
3722 | if (val) | |
3723 | return -EINVAL; | |
3724 | ||
3725 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3726 | *(u64 *)((void *)vcpu + stat_data->offset) = 0; | |
3727 | ||
3728 | return 0; | |
3729 | } | |
3730 | ||
3731 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) | |
3732 | { | |
3733 | __simple_attr_check_format("%llu\n", 0ull); | |
3734 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, | |
3735 | vcpu_stat_clear_per_vm, "%llu\n"); | |
3736 | } | |
3737 | ||
3738 | static const struct file_operations vcpu_stat_get_per_vm_fops = { | |
3739 | .owner = THIS_MODULE, | |
3740 | .open = vcpu_stat_get_per_vm_open, | |
3741 | .release = kvm_debugfs_release, | |
3742 | .read = simple_attr_read, | |
3743 | .write = simple_attr_write, | |
3744 | .llseek = generic_file_llseek, | |
3745 | }; | |
3746 | ||
3747 | static const struct file_operations *stat_fops_per_vm[] = { | |
3748 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, | |
3749 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, | |
3750 | }; | |
3751 | ||
3752 | static int vm_stat_get(void *_offset, u64 *val) | |
3753 | { | |
3754 | unsigned offset = (long)_offset; | |
3755 | struct kvm *kvm; | |
3756 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3757 | u64 tmp_val; | |
3758 | ||
3759 | *val = 0; | |
3760 | spin_lock(&kvm_lock); | |
3761 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3762 | stat_tmp.kvm = kvm; | |
3763 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3764 | *val += tmp_val; | |
3765 | } | |
3766 | spin_unlock(&kvm_lock); | |
3767 | return 0; | |
3768 | } | |
3769 | ||
3770 | static int vm_stat_clear(void *_offset, u64 val) | |
3771 | { | |
3772 | unsigned offset = (long)_offset; | |
3773 | struct kvm *kvm; | |
3774 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3775 | ||
3776 | if (val) | |
3777 | return -EINVAL; | |
3778 | ||
3779 | spin_lock(&kvm_lock); | |
3780 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3781 | stat_tmp.kvm = kvm; | |
3782 | vm_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3783 | } | |
3784 | spin_unlock(&kvm_lock); | |
3785 | ||
3786 | return 0; | |
3787 | } | |
3788 | ||
3789 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
3790 | ||
3791 | static int vcpu_stat_get(void *_offset, u64 *val) | |
3792 | { | |
3793 | unsigned offset = (long)_offset; | |
3794 | struct kvm *kvm; | |
3795 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3796 | u64 tmp_val; | |
3797 | ||
3798 | *val = 0; | |
3799 | spin_lock(&kvm_lock); | |
3800 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3801 | stat_tmp.kvm = kvm; | |
3802 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3803 | *val += tmp_val; | |
3804 | } | |
3805 | spin_unlock(&kvm_lock); | |
3806 | return 0; | |
3807 | } | |
3808 | ||
3809 | static int vcpu_stat_clear(void *_offset, u64 val) | |
3810 | { | |
3811 | unsigned offset = (long)_offset; | |
3812 | struct kvm *kvm; | |
3813 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3814 | ||
3815 | if (val) | |
3816 | return -EINVAL; | |
3817 | ||
3818 | spin_lock(&kvm_lock); | |
3819 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3820 | stat_tmp.kvm = kvm; | |
3821 | vcpu_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3822 | } | |
3823 | spin_unlock(&kvm_lock); | |
3824 | ||
3825 | return 0; | |
3826 | } | |
3827 | ||
3828 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
3829 | "%llu\n"); | |
3830 | ||
3831 | static const struct file_operations *stat_fops[] = { | |
3832 | [KVM_STAT_VCPU] = &vcpu_stat_fops, | |
3833 | [KVM_STAT_VM] = &vm_stat_fops, | |
3834 | }; | |
3835 | ||
3836 | static int kvm_init_debug(void) | |
3837 | { | |
3838 | int r = -EEXIST; | |
3839 | struct kvm_stats_debugfs_item *p; | |
3840 | ||
3841 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); | |
3842 | if (kvm_debugfs_dir == NULL) | |
3843 | goto out; | |
3844 | ||
3845 | kvm_debugfs_num_entries = 0; | |
3846 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
3847 | if (!debugfs_create_file(p->name, 0644, kvm_debugfs_dir, | |
3848 | (void *)(long)p->offset, | |
3849 | stat_fops[p->kind])) | |
3850 | goto out_dir; | |
3851 | } | |
3852 | ||
3853 | return 0; | |
3854 | ||
3855 | out_dir: | |
3856 | debugfs_remove_recursive(kvm_debugfs_dir); | |
3857 | out: | |
3858 | return r; | |
3859 | } | |
3860 | ||
3861 | static int kvm_suspend(void) | |
3862 | { | |
3863 | if (kvm_usage_count) | |
3864 | hardware_disable_nolock(NULL); | |
3865 | return 0; | |
3866 | } | |
3867 | ||
3868 | static void kvm_resume(void) | |
3869 | { | |
3870 | if (kvm_usage_count) { | |
3871 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); | |
3872 | hardware_enable_nolock(NULL); | |
3873 | } | |
3874 | } | |
3875 | ||
3876 | static struct syscore_ops kvm_syscore_ops = { | |
3877 | .suspend = kvm_suspend, | |
3878 | .resume = kvm_resume, | |
3879 | }; | |
3880 | ||
3881 | static inline | |
3882 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
3883 | { | |
3884 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
3885 | } | |
3886 | ||
3887 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
3888 | { | |
3889 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3890 | ||
3891 | if (vcpu->preempted) | |
3892 | vcpu->preempted = false; | |
3893 | ||
3894 | kvm_arch_sched_in(vcpu, cpu); | |
3895 | ||
3896 | kvm_arch_vcpu_load(vcpu, cpu); | |
3897 | } | |
3898 | ||
3899 | static void kvm_sched_out(struct preempt_notifier *pn, | |
3900 | struct task_struct *next) | |
3901 | { | |
3902 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3903 | ||
3904 | if (current->state == TASK_RUNNING) | |
3905 | vcpu->preempted = true; | |
3906 | kvm_arch_vcpu_put(vcpu); | |
3907 | } | |
3908 | ||
3909 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, | |
3910 | struct module *module) | |
3911 | { | |
3912 | int r; | |
3913 | int cpu; | |
3914 | ||
3915 | r = kvm_arch_init(opaque); | |
3916 | if (r) | |
3917 | goto out_fail; | |
3918 | ||
3919 | /* | |
3920 | * kvm_arch_init makes sure there's at most one caller | |
3921 | * for architectures that support multiple implementations, | |
3922 | * like intel and amd on x86. | |
3923 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating | |
3924 | * conflicts in case kvm is already setup for another implementation. | |
3925 | */ | |
3926 | r = kvm_irqfd_init(); | |
3927 | if (r) | |
3928 | goto out_irqfd; | |
3929 | ||
3930 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { | |
3931 | r = -ENOMEM; | |
3932 | goto out_free_0; | |
3933 | } | |
3934 | ||
3935 | r = kvm_arch_hardware_setup(); | |
3936 | if (r < 0) | |
3937 | goto out_free_0a; | |
3938 | ||
3939 | for_each_online_cpu(cpu) { | |
3940 | smp_call_function_single(cpu, | |
3941 | kvm_arch_check_processor_compat, | |
3942 | &r, 1); | |
3943 | if (r < 0) | |
3944 | goto out_free_1; | |
3945 | } | |
3946 | ||
3947 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", | |
3948 | kvm_starting_cpu, kvm_dying_cpu); | |
3949 | if (r) | |
3950 | goto out_free_2; | |
3951 | register_reboot_notifier(&kvm_reboot_notifier); | |
3952 | ||
3953 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ | |
3954 | if (!vcpu_align) | |
3955 | vcpu_align = __alignof__(struct kvm_vcpu); | |
3956 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
3957 | 0, NULL); | |
3958 | if (!kvm_vcpu_cache) { | |
3959 | r = -ENOMEM; | |
3960 | goto out_free_3; | |
3961 | } | |
3962 | ||
3963 | r = kvm_async_pf_init(); | |
3964 | if (r) | |
3965 | goto out_free; | |
3966 | ||
3967 | kvm_chardev_ops.owner = module; | |
3968 | kvm_vm_fops.owner = module; | |
3969 | kvm_vcpu_fops.owner = module; | |
3970 | ||
3971 | r = misc_register(&kvm_dev); | |
3972 | if (r) { | |
3973 | pr_err("kvm: misc device register failed\n"); | |
3974 | goto out_unreg; | |
3975 | } | |
3976 | ||
3977 | register_syscore_ops(&kvm_syscore_ops); | |
3978 | ||
3979 | kvm_preempt_ops.sched_in = kvm_sched_in; | |
3980 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
3981 | ||
3982 | r = kvm_init_debug(); | |
3983 | if (r) { | |
3984 | pr_err("kvm: create debugfs files failed\n"); | |
3985 | goto out_undebugfs; | |
3986 | } | |
3987 | ||
3988 | r = kvm_vfio_ops_init(); | |
3989 | WARN_ON(r); | |
3990 | ||
3991 | return 0; | |
3992 | ||
3993 | out_undebugfs: | |
3994 | unregister_syscore_ops(&kvm_syscore_ops); | |
3995 | misc_deregister(&kvm_dev); | |
3996 | out_unreg: | |
3997 | kvm_async_pf_deinit(); | |
3998 | out_free: | |
3999 | kmem_cache_destroy(kvm_vcpu_cache); | |
4000 | out_free_3: | |
4001 | unregister_reboot_notifier(&kvm_reboot_notifier); | |
4002 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); | |
4003 | out_free_2: | |
4004 | out_free_1: | |
4005 | kvm_arch_hardware_unsetup(); | |
4006 | out_free_0a: | |
4007 | free_cpumask_var(cpus_hardware_enabled); | |
4008 | out_free_0: | |
4009 | kvm_irqfd_exit(); | |
4010 | out_irqfd: | |
4011 | kvm_arch_exit(); | |
4012 | out_fail: | |
4013 | return r; | |
4014 | } | |
4015 | EXPORT_SYMBOL_GPL(kvm_init); | |
4016 | ||
4017 | void kvm_exit(void) | |
4018 | { | |
4019 | debugfs_remove_recursive(kvm_debugfs_dir); | |
4020 | misc_deregister(&kvm_dev); | |
4021 | kmem_cache_destroy(kvm_vcpu_cache); | |
4022 | kvm_async_pf_deinit(); | |
4023 | unregister_syscore_ops(&kvm_syscore_ops); | |
4024 | unregister_reboot_notifier(&kvm_reboot_notifier); | |
4025 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); | |
4026 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
4027 | kvm_arch_hardware_unsetup(); | |
4028 | kvm_arch_exit(); | |
4029 | kvm_irqfd_exit(); | |
4030 | free_cpumask_var(cpus_hardware_enabled); | |
4031 | kvm_vfio_ops_exit(); | |
4032 | } | |
4033 | EXPORT_SYMBOL_GPL(kvm_exit); |