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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/sched/stat.h> | |
38 | #include <linux/cpumask.h> | |
39 | #include <linux/smp.h> | |
40 | #include <linux/anon_inodes.h> | |
41 | #include <linux/profile.h> | |
42 | #include <linux/kvm_para.h> | |
43 | #include <linux/pagemap.h> | |
44 | #include <linux/mman.h> | |
45 | #include <linux/swap.h> | |
46 | #include <linux/bitops.h> | |
47 | #include <linux/spinlock.h> | |
48 | #include <linux/compat.h> | |
49 | #include <linux/srcu.h> | |
50 | #include <linux/hugetlb.h> | |
51 | #include <linux/slab.h> | |
52 | #include <linux/sort.h> | |
53 | #include <linux/bsearch.h> | |
54 | #include <linux/kthread.h> | |
55 | ||
56 | #include <asm/processor.h> | |
57 | #include <asm/io.h> | |
58 | #include <asm/ioctl.h> | |
59 | #include <linux/uaccess.h> | |
60 | #include <asm/pgtable.h> | |
61 | ||
62 | #include "coalesced_mmio.h" | |
63 | #include "async_pf.h" | |
64 | #include "vfio.h" | |
65 | ||
66 | #define CREATE_TRACE_POINTS | |
67 | #include <trace/events/kvm.h> | |
68 | ||
69 | /* Worst case buffer size needed for holding an integer. */ | |
70 | #define ITOA_MAX_LEN 12 | |
71 | ||
72 | MODULE_AUTHOR("Qumranet"); | |
73 | MODULE_LICENSE("GPL"); | |
74 | ||
75 | /* Architectures should define their poll value according to the halt latency */ | |
76 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; | |
77 | module_param(halt_poll_ns, uint, 0644); | |
78 | EXPORT_SYMBOL_GPL(halt_poll_ns); | |
79 | ||
80 | /* Default doubles per-vcpu halt_poll_ns. */ | |
81 | unsigned int halt_poll_ns_grow = 2; | |
82 | module_param(halt_poll_ns_grow, uint, 0644); | |
83 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); | |
84 | ||
85 | /* Default resets per-vcpu halt_poll_ns . */ | |
86 | unsigned int halt_poll_ns_shrink; | |
87 | module_param(halt_poll_ns_shrink, uint, 0644); | |
88 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); | |
89 | ||
90 | /* | |
91 | * Ordering of locks: | |
92 | * | |
93 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock | |
94 | */ | |
95 | ||
96 | DEFINE_MUTEX(kvm_lock); | |
97 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); | |
98 | LIST_HEAD(vm_list); | |
99 | ||
100 | static cpumask_var_t cpus_hardware_enabled; | |
101 | static int kvm_usage_count; | |
102 | static atomic_t hardware_enable_failed; | |
103 | ||
104 | struct kmem_cache *kvm_vcpu_cache; | |
105 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
106 | ||
107 | static __read_mostly struct preempt_ops kvm_preempt_ops; | |
108 | ||
109 | struct dentry *kvm_debugfs_dir; | |
110 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); | |
111 | ||
112 | static int kvm_debugfs_num_entries; | |
113 | static const struct file_operations *stat_fops_per_vm[]; | |
114 | ||
115 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, | |
116 | unsigned long arg); | |
117 | #ifdef CONFIG_KVM_COMPAT | |
118 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, | |
119 | unsigned long arg); | |
120 | #endif | |
121 | static int hardware_enable_all(void); | |
122 | static void hardware_disable_all(void); | |
123 | ||
124 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); | |
125 | ||
126 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); | |
127 | ||
128 | __visible bool kvm_rebooting; | |
129 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
130 | ||
131 | static bool largepages_enabled = true; | |
132 | ||
133 | #define KVM_EVENT_CREATE_VM 0 | |
134 | #define KVM_EVENT_DESTROY_VM 1 | |
135 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
136 | static unsigned long long kvm_createvm_count; | |
137 | static unsigned long long kvm_active_vms; | |
138 | ||
139 | __weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, | |
140 | unsigned long start, unsigned long end) | |
141 | { | |
142 | } | |
143 | ||
144 | bool kvm_is_zone_device_pfn(kvm_pfn_t pfn) | |
145 | { | |
146 | /* | |
147 | * The metadata used by is_zone_device_page() to determine whether or | |
148 | * not a page is ZONE_DEVICE is guaranteed to be valid if and only if | |
149 | * the device has been pinned, e.g. by get_user_pages(). WARN if the | |
150 | * page_count() is zero to help detect bad usage of this helper. | |
151 | */ | |
152 | if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn)))) | |
153 | return false; | |
154 | ||
155 | return is_zone_device_page(pfn_to_page(pfn)); | |
156 | } | |
157 | ||
158 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) | |
159 | { | |
160 | /* | |
161 | * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting | |
162 | * perspective they are "normal" pages, albeit with slightly different | |
163 | * usage rules. | |
164 | */ | |
165 | if (pfn_valid(pfn)) | |
166 | return PageReserved(pfn_to_page(pfn)) && | |
167 | !kvm_is_zone_device_pfn(pfn); | |
168 | ||
169 | return true; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Switches to specified vcpu, until a matching vcpu_put() | |
174 | */ | |
175 | int vcpu_load(struct kvm_vcpu *vcpu) | |
176 | { | |
177 | int cpu; | |
178 | ||
179 | if (mutex_lock_killable(&vcpu->mutex)) | |
180 | return -EINTR; | |
181 | cpu = get_cpu(); | |
182 | preempt_notifier_register(&vcpu->preempt_notifier); | |
183 | kvm_arch_vcpu_load(vcpu, cpu); | |
184 | put_cpu(); | |
185 | return 0; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(vcpu_load); | |
188 | ||
189 | void vcpu_put(struct kvm_vcpu *vcpu) | |
190 | { | |
191 | preempt_disable(); | |
192 | kvm_arch_vcpu_put(vcpu); | |
193 | preempt_notifier_unregister(&vcpu->preempt_notifier); | |
194 | preempt_enable(); | |
195 | mutex_unlock(&vcpu->mutex); | |
196 | } | |
197 | EXPORT_SYMBOL_GPL(vcpu_put); | |
198 | ||
199 | /* TODO: merge with kvm_arch_vcpu_should_kick */ | |
200 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
201 | { | |
202 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
203 | ||
204 | /* | |
205 | * We need to wait for the VCPU to reenable interrupts and get out of | |
206 | * READING_SHADOW_PAGE_TABLES mode. | |
207 | */ | |
208 | if (req & KVM_REQUEST_WAIT) | |
209 | return mode != OUTSIDE_GUEST_MODE; | |
210 | ||
211 | /* | |
212 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
213 | */ | |
214 | return mode == IN_GUEST_MODE; | |
215 | } | |
216 | ||
217 | static void ack_flush(void *_completed) | |
218 | { | |
219 | } | |
220 | ||
221 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) | |
222 | { | |
223 | if (unlikely(!cpus)) | |
224 | cpus = cpu_online_mask; | |
225 | ||
226 | if (cpumask_empty(cpus)) | |
227 | return false; | |
228 | ||
229 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
230 | return true; | |
231 | } | |
232 | ||
233 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
234 | { | |
235 | int i, cpu, me; | |
236 | cpumask_var_t cpus; | |
237 | bool called; | |
238 | struct kvm_vcpu *vcpu; | |
239 | ||
240 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
241 | ||
242 | me = get_cpu(); | |
243 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
244 | kvm_make_request(req, vcpu); | |
245 | cpu = vcpu->cpu; | |
246 | ||
247 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) | |
248 | continue; | |
249 | ||
250 | if (cpus != NULL && cpu != -1 && cpu != me && | |
251 | kvm_request_needs_ipi(vcpu, req)) | |
252 | __cpumask_set_cpu(cpu, cpus); | |
253 | } | |
254 | called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT)); | |
255 | put_cpu(); | |
256 | free_cpumask_var(cpus); | |
257 | return called; | |
258 | } | |
259 | ||
260 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL | |
261 | void kvm_flush_remote_tlbs(struct kvm *kvm) | |
262 | { | |
263 | /* | |
264 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
265 | * kvm_make_all_cpus_request. | |
266 | */ | |
267 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
268 | ||
269 | /* | |
270 | * We want to publish modifications to the page tables before reading | |
271 | * mode. Pairs with a memory barrier in arch-specific code. | |
272 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
273 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
274 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
275 | * | |
276 | * There is already an smp_mb__after_atomic() before | |
277 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
278 | * barrier here. | |
279 | */ | |
280 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
281 | ++kvm->stat.remote_tlb_flush; | |
282 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); | |
285 | #endif | |
286 | ||
287 | void kvm_reload_remote_mmus(struct kvm *kvm) | |
288 | { | |
289 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
290 | } | |
291 | ||
292 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) | |
293 | { | |
294 | struct page *page; | |
295 | int r; | |
296 | ||
297 | mutex_init(&vcpu->mutex); | |
298 | vcpu->cpu = -1; | |
299 | vcpu->kvm = kvm; | |
300 | vcpu->vcpu_id = id; | |
301 | vcpu->pid = NULL; | |
302 | init_swait_queue_head(&vcpu->wq); | |
303 | kvm_async_pf_vcpu_init(vcpu); | |
304 | ||
305 | vcpu->pre_pcpu = -1; | |
306 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
307 | ||
308 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
309 | if (!page) { | |
310 | r = -ENOMEM; | |
311 | goto fail; | |
312 | } | |
313 | vcpu->run = page_address(page); | |
314 | ||
315 | kvm_vcpu_set_in_spin_loop(vcpu, false); | |
316 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
317 | vcpu->preempted = false; | |
318 | ||
319 | r = kvm_arch_vcpu_init(vcpu); | |
320 | if (r < 0) | |
321 | goto fail_free_run; | |
322 | return 0; | |
323 | ||
324 | fail_free_run: | |
325 | free_page((unsigned long)vcpu->run); | |
326 | fail: | |
327 | return r; | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
330 | ||
331 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
332 | { | |
333 | /* | |
334 | * no need for rcu_read_lock as VCPU_RUN is the only place that | |
335 | * will change the vcpu->pid pointer and on uninit all file | |
336 | * descriptors are already gone. | |
337 | */ | |
338 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
339 | kvm_arch_vcpu_uninit(vcpu); | |
340 | free_page((unsigned long)vcpu->run); | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
343 | ||
344 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
345 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
346 | { | |
347 | return container_of(mn, struct kvm, mmu_notifier); | |
348 | } | |
349 | ||
350 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, | |
351 | struct mm_struct *mm, | |
352 | unsigned long address, | |
353 | pte_t pte) | |
354 | { | |
355 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
356 | int idx; | |
357 | ||
358 | idx = srcu_read_lock(&kvm->srcu); | |
359 | spin_lock(&kvm->mmu_lock); | |
360 | kvm->mmu_notifier_seq++; | |
361 | kvm_set_spte_hva(kvm, address, pte); | |
362 | spin_unlock(&kvm->mmu_lock); | |
363 | srcu_read_unlock(&kvm->srcu, idx); | |
364 | } | |
365 | ||
366 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, | |
367 | struct mm_struct *mm, | |
368 | unsigned long start, | |
369 | unsigned long end) | |
370 | { | |
371 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
372 | int need_tlb_flush = 0, idx; | |
373 | ||
374 | idx = srcu_read_lock(&kvm->srcu); | |
375 | spin_lock(&kvm->mmu_lock); | |
376 | /* | |
377 | * The count increase must become visible at unlock time as no | |
378 | * spte can be established without taking the mmu_lock and | |
379 | * count is also read inside the mmu_lock critical section. | |
380 | */ | |
381 | kvm->mmu_notifier_count++; | |
382 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); | |
383 | need_tlb_flush |= kvm->tlbs_dirty; | |
384 | /* we've to flush the tlb before the pages can be freed */ | |
385 | if (need_tlb_flush) | |
386 | kvm_flush_remote_tlbs(kvm); | |
387 | ||
388 | spin_unlock(&kvm->mmu_lock); | |
389 | ||
390 | kvm_arch_mmu_notifier_invalidate_range(kvm, start, end); | |
391 | ||
392 | srcu_read_unlock(&kvm->srcu, idx); | |
393 | } | |
394 | ||
395 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
396 | struct mm_struct *mm, | |
397 | unsigned long start, | |
398 | unsigned long end) | |
399 | { | |
400 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
401 | ||
402 | spin_lock(&kvm->mmu_lock); | |
403 | /* | |
404 | * This sequence increase will notify the kvm page fault that | |
405 | * the page that is going to be mapped in the spte could have | |
406 | * been freed. | |
407 | */ | |
408 | kvm->mmu_notifier_seq++; | |
409 | smp_wmb(); | |
410 | /* | |
411 | * The above sequence increase must be visible before the | |
412 | * below count decrease, which is ensured by the smp_wmb above | |
413 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
414 | */ | |
415 | kvm->mmu_notifier_count--; | |
416 | spin_unlock(&kvm->mmu_lock); | |
417 | ||
418 | BUG_ON(kvm->mmu_notifier_count < 0); | |
419 | } | |
420 | ||
421 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
422 | struct mm_struct *mm, | |
423 | unsigned long start, | |
424 | unsigned long end) | |
425 | { | |
426 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
427 | int young, idx; | |
428 | ||
429 | idx = srcu_read_lock(&kvm->srcu); | |
430 | spin_lock(&kvm->mmu_lock); | |
431 | ||
432 | young = kvm_age_hva(kvm, start, end); | |
433 | if (young) | |
434 | kvm_flush_remote_tlbs(kvm); | |
435 | ||
436 | spin_unlock(&kvm->mmu_lock); | |
437 | srcu_read_unlock(&kvm->srcu, idx); | |
438 | ||
439 | return young; | |
440 | } | |
441 | ||
442 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, | |
443 | struct mm_struct *mm, | |
444 | unsigned long start, | |
445 | unsigned long end) | |
446 | { | |
447 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
448 | int young, idx; | |
449 | ||
450 | idx = srcu_read_lock(&kvm->srcu); | |
451 | spin_lock(&kvm->mmu_lock); | |
452 | /* | |
453 | * Even though we do not flush TLB, this will still adversely | |
454 | * affect performance on pre-Haswell Intel EPT, where there is | |
455 | * no EPT Access Bit to clear so that we have to tear down EPT | |
456 | * tables instead. If we find this unacceptable, we can always | |
457 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
458 | * do anything on clear_young. | |
459 | * | |
460 | * Also note that currently we never issue secondary TLB flushes | |
461 | * from clear_young, leaving this job up to the regular system | |
462 | * cadence. If we find this inaccurate, we might come up with a | |
463 | * more sophisticated heuristic later. | |
464 | */ | |
465 | young = kvm_age_hva(kvm, start, end); | |
466 | spin_unlock(&kvm->mmu_lock); | |
467 | srcu_read_unlock(&kvm->srcu, idx); | |
468 | ||
469 | return young; | |
470 | } | |
471 | ||
472 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, | |
473 | struct mm_struct *mm, | |
474 | unsigned long address) | |
475 | { | |
476 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
477 | int young, idx; | |
478 | ||
479 | idx = srcu_read_lock(&kvm->srcu); | |
480 | spin_lock(&kvm->mmu_lock); | |
481 | young = kvm_test_age_hva(kvm, address); | |
482 | spin_unlock(&kvm->mmu_lock); | |
483 | srcu_read_unlock(&kvm->srcu, idx); | |
484 | ||
485 | return young; | |
486 | } | |
487 | ||
488 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, | |
489 | struct mm_struct *mm) | |
490 | { | |
491 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
492 | int idx; | |
493 | ||
494 | idx = srcu_read_lock(&kvm->srcu); | |
495 | kvm_arch_flush_shadow_all(kvm); | |
496 | srcu_read_unlock(&kvm->srcu, idx); | |
497 | } | |
498 | ||
499 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { | |
500 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
501 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
502 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
503 | .clear_young = kvm_mmu_notifier_clear_young, | |
504 | .test_young = kvm_mmu_notifier_test_young, | |
505 | .change_pte = kvm_mmu_notifier_change_pte, | |
506 | .release = kvm_mmu_notifier_release, | |
507 | }; | |
508 | ||
509 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
510 | { | |
511 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
512 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
513 | } | |
514 | ||
515 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
516 | ||
517 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
518 | { | |
519 | return 0; | |
520 | } | |
521 | ||
522 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ | |
523 | ||
524 | static struct kvm_memslots *kvm_alloc_memslots(void) | |
525 | { | |
526 | int i; | |
527 | struct kvm_memslots *slots; | |
528 | ||
529 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
530 | if (!slots) | |
531 | return NULL; | |
532 | ||
533 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
534 | slots->id_to_index[i] = slots->memslots[i].id = i; | |
535 | ||
536 | return slots; | |
537 | } | |
538 | ||
539 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
540 | { | |
541 | if (!memslot->dirty_bitmap) | |
542 | return; | |
543 | ||
544 | kvfree(memslot->dirty_bitmap); | |
545 | memslot->dirty_bitmap = NULL; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Free any memory in @free but not in @dont. | |
550 | */ | |
551 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
552 | struct kvm_memory_slot *dont) | |
553 | { | |
554 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
555 | kvm_destroy_dirty_bitmap(free); | |
556 | ||
557 | kvm_arch_free_memslot(kvm, free, dont); | |
558 | ||
559 | free->npages = 0; | |
560 | } | |
561 | ||
562 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
563 | { | |
564 | struct kvm_memory_slot *memslot; | |
565 | ||
566 | if (!slots) | |
567 | return; | |
568 | ||
569 | kvm_for_each_memslot(memslot, slots) | |
570 | kvm_free_memslot(kvm, memslot, NULL); | |
571 | ||
572 | kvfree(slots); | |
573 | } | |
574 | ||
575 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) | |
576 | { | |
577 | int i; | |
578 | ||
579 | if (!kvm->debugfs_dentry) | |
580 | return; | |
581 | ||
582 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
583 | ||
584 | if (kvm->debugfs_stat_data) { | |
585 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
586 | kfree(kvm->debugfs_stat_data[i]); | |
587 | kfree(kvm->debugfs_stat_data); | |
588 | } | |
589 | } | |
590 | ||
591 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
592 | { | |
593 | char dir_name[ITOA_MAX_LEN * 2]; | |
594 | struct kvm_stat_data *stat_data; | |
595 | struct kvm_stats_debugfs_item *p; | |
596 | ||
597 | if (!debugfs_initialized()) | |
598 | return 0; | |
599 | ||
600 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
601 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, | |
602 | kvm_debugfs_dir); | |
603 | if (!kvm->debugfs_dentry) | |
604 | return -ENOMEM; | |
605 | ||
606 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
607 | sizeof(*kvm->debugfs_stat_data), | |
608 | GFP_KERNEL); | |
609 | if (!kvm->debugfs_stat_data) | |
610 | return -ENOMEM; | |
611 | ||
612 | for (p = debugfs_entries; p->name; p++) { | |
613 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); | |
614 | if (!stat_data) | |
615 | return -ENOMEM; | |
616 | ||
617 | stat_data->kvm = kvm; | |
618 | stat_data->offset = p->offset; | |
619 | stat_data->mode = p->mode ? p->mode : 0644; | |
620 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; | |
621 | if (!debugfs_create_file(p->name, stat_data->mode, | |
622 | kvm->debugfs_dentry, | |
623 | stat_data, | |
624 | stat_fops_per_vm[p->kind])) | |
625 | return -ENOMEM; | |
626 | } | |
627 | return 0; | |
628 | } | |
629 | ||
630 | /* | |
631 | * Called after the VM is otherwise initialized, but just before adding it to | |
632 | * the vm_list. | |
633 | */ | |
634 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | |
635 | { | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Called just after removing the VM from the vm_list, but before doing any | |
641 | * other destruction. | |
642 | */ | |
643 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | |
644 | { | |
645 | } | |
646 | ||
647 | static struct kvm *kvm_create_vm(unsigned long type) | |
648 | { | |
649 | int r, i; | |
650 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
651 | ||
652 | if (!kvm) | |
653 | return ERR_PTR(-ENOMEM); | |
654 | ||
655 | spin_lock_init(&kvm->mmu_lock); | |
656 | mmgrab(current->mm); | |
657 | kvm->mm = current->mm; | |
658 | kvm_eventfd_init(kvm); | |
659 | mutex_init(&kvm->lock); | |
660 | mutex_init(&kvm->irq_lock); | |
661 | mutex_init(&kvm->slots_lock); | |
662 | refcount_set(&kvm->users_count, 1); | |
663 | INIT_LIST_HEAD(&kvm->devices); | |
664 | ||
665 | r = kvm_arch_init_vm(kvm, type); | |
666 | if (r) | |
667 | goto out_err_no_disable; | |
668 | ||
669 | r = hardware_enable_all(); | |
670 | if (r) | |
671 | goto out_err_no_disable; | |
672 | ||
673 | #ifdef CONFIG_HAVE_KVM_IRQFD | |
674 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); | |
675 | #endif | |
676 | ||
677 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); | |
678 | ||
679 | r = -ENOMEM; | |
680 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { | |
681 | struct kvm_memslots *slots = kvm_alloc_memslots(); | |
682 | if (!slots) | |
683 | goto out_err_no_srcu; | |
684 | /* | |
685 | * Generations must be different for each address space. | |
686 | * Init kvm generation close to the maximum to easily test the | |
687 | * code of handling generation number wrap-around. | |
688 | */ | |
689 | slots->generation = i * 2 - 150; | |
690 | rcu_assign_pointer(kvm->memslots[i], slots); | |
691 | } | |
692 | ||
693 | if (init_srcu_struct(&kvm->srcu)) | |
694 | goto out_err_no_srcu; | |
695 | if (init_srcu_struct(&kvm->irq_srcu)) | |
696 | goto out_err_no_irq_srcu; | |
697 | for (i = 0; i < KVM_NR_BUSES; i++) { | |
698 | rcu_assign_pointer(kvm->buses[i], | |
699 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL)); | |
700 | if (!kvm->buses[i]) | |
701 | goto out_err_no_mmu_notifier; | |
702 | } | |
703 | ||
704 | r = kvm_init_mmu_notifier(kvm); | |
705 | if (r) | |
706 | goto out_err_no_mmu_notifier; | |
707 | ||
708 | r = kvm_arch_post_init_vm(kvm); | |
709 | if (r) | |
710 | goto out_err; | |
711 | ||
712 | mutex_lock(&kvm_lock); | |
713 | list_add(&kvm->vm_list, &vm_list); | |
714 | mutex_unlock(&kvm_lock); | |
715 | ||
716 | preempt_notifier_inc(); | |
717 | ||
718 | return kvm; | |
719 | ||
720 | out_err: | |
721 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
722 | if (kvm->mmu_notifier.ops) | |
723 | mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); | |
724 | #endif | |
725 | out_err_no_mmu_notifier: | |
726 | cleanup_srcu_struct(&kvm->irq_srcu); | |
727 | out_err_no_irq_srcu: | |
728 | cleanup_srcu_struct(&kvm->srcu); | |
729 | out_err_no_srcu: | |
730 | hardware_disable_all(); | |
731 | out_err_no_disable: | |
732 | refcount_set(&kvm->users_count, 0); | |
733 | for (i = 0; i < KVM_NR_BUSES; i++) | |
734 | kfree(kvm_get_bus(kvm, i)); | |
735 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) | |
736 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); | |
737 | kvm_arch_free_vm(kvm); | |
738 | mmdrop(current->mm); | |
739 | return ERR_PTR(r); | |
740 | } | |
741 | ||
742 | static void kvm_destroy_devices(struct kvm *kvm) | |
743 | { | |
744 | struct kvm_device *dev, *tmp; | |
745 | ||
746 | /* | |
747 | * We do not need to take the kvm->lock here, because nobody else | |
748 | * has a reference to the struct kvm at this point and therefore | |
749 | * cannot access the devices list anyhow. | |
750 | */ | |
751 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { | |
752 | list_del(&dev->vm_node); | |
753 | dev->ops->destroy(dev); | |
754 | } | |
755 | } | |
756 | ||
757 | static void kvm_destroy_vm(struct kvm *kvm) | |
758 | { | |
759 | int i; | |
760 | struct mm_struct *mm = kvm->mm; | |
761 | ||
762 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); | |
763 | kvm_destroy_vm_debugfs(kvm); | |
764 | kvm_arch_sync_events(kvm); | |
765 | mutex_lock(&kvm_lock); | |
766 | list_del(&kvm->vm_list); | |
767 | mutex_unlock(&kvm_lock); | |
768 | kvm_arch_pre_destroy_vm(kvm); | |
769 | ||
770 | kvm_free_irq_routing(kvm); | |
771 | for (i = 0; i < KVM_NR_BUSES; i++) { | |
772 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); | |
773 | ||
774 | if (bus) | |
775 | kvm_io_bus_destroy(bus); | |
776 | kvm->buses[i] = NULL; | |
777 | } | |
778 | kvm_coalesced_mmio_free(kvm); | |
779 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
780 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
781 | #else | |
782 | kvm_arch_flush_shadow_all(kvm); | |
783 | #endif | |
784 | kvm_arch_destroy_vm(kvm); | |
785 | kvm_destroy_devices(kvm); | |
786 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) | |
787 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); | |
788 | cleanup_srcu_struct(&kvm->irq_srcu); | |
789 | cleanup_srcu_struct(&kvm->srcu); | |
790 | kvm_arch_free_vm(kvm); | |
791 | preempt_notifier_dec(); | |
792 | hardware_disable_all(); | |
793 | mmdrop(mm); | |
794 | } | |
795 | ||
796 | void kvm_get_kvm(struct kvm *kvm) | |
797 | { | |
798 | refcount_inc(&kvm->users_count); | |
799 | } | |
800 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
801 | ||
802 | void kvm_put_kvm(struct kvm *kvm) | |
803 | { | |
804 | if (refcount_dec_and_test(&kvm->users_count)) | |
805 | kvm_destroy_vm(kvm); | |
806 | } | |
807 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
808 | ||
809 | ||
810 | static int kvm_vm_release(struct inode *inode, struct file *filp) | |
811 | { | |
812 | struct kvm *kvm = filp->private_data; | |
813 | ||
814 | kvm_irqfd_release(kvm); | |
815 | ||
816 | kvm_put_kvm(kvm); | |
817 | return 0; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Allocation size is twice as large as the actual dirty bitmap size. | |
822 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. | |
823 | */ | |
824 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) | |
825 | { | |
826 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); | |
827 | ||
828 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL); | |
829 | if (!memslot->dirty_bitmap) | |
830 | return -ENOMEM; | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Insert memslot and re-sort memslots based on their GFN, | |
837 | * so binary search could be used to lookup GFN. | |
838 | * Sorting algorithm takes advantage of having initially | |
839 | * sorted array and known changed memslot position. | |
840 | */ | |
841 | static void update_memslots(struct kvm_memslots *slots, | |
842 | struct kvm_memory_slot *new) | |
843 | { | |
844 | int id = new->id; | |
845 | int i = slots->id_to_index[id]; | |
846 | struct kvm_memory_slot *mslots = slots->memslots; | |
847 | ||
848 | WARN_ON(mslots[i].id != id); | |
849 | if (!new->npages) { | |
850 | WARN_ON(!mslots[i].npages); | |
851 | if (mslots[i].npages) | |
852 | slots->used_slots--; | |
853 | } else { | |
854 | if (!mslots[i].npages) | |
855 | slots->used_slots++; | |
856 | } | |
857 | ||
858 | while (i < KVM_MEM_SLOTS_NUM - 1 && | |
859 | new->base_gfn <= mslots[i + 1].base_gfn) { | |
860 | if (!mslots[i + 1].npages) | |
861 | break; | |
862 | mslots[i] = mslots[i + 1]; | |
863 | slots->id_to_index[mslots[i].id] = i; | |
864 | i++; | |
865 | } | |
866 | ||
867 | /* | |
868 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
869 | * so that it moves before all those with base_gfn == npages == 0. | |
870 | * | |
871 | * On the other hand, if new->npages is zero, the above loop has | |
872 | * already left i pointing to the beginning of the empty part of | |
873 | * mslots, and the ">=" would move the hole backwards in this | |
874 | * case---which is wrong. So skip the loop when deleting a slot. | |
875 | */ | |
876 | if (new->npages) { | |
877 | while (i > 0 && | |
878 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
879 | mslots[i] = mslots[i - 1]; | |
880 | slots->id_to_index[mslots[i].id] = i; | |
881 | i--; | |
882 | } | |
883 | } else | |
884 | WARN_ON_ONCE(i != slots->used_slots); | |
885 | ||
886 | mslots[i] = *new; | |
887 | slots->id_to_index[mslots[i].id] = i; | |
888 | } | |
889 | ||
890 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) | |
891 | { | |
892 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; | |
893 | ||
894 | #ifdef __KVM_HAVE_READONLY_MEM | |
895 | valid_flags |= KVM_MEM_READONLY; | |
896 | #endif | |
897 | ||
898 | if (mem->flags & ~valid_flags) | |
899 | return -EINVAL; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, | |
905 | int as_id, struct kvm_memslots *slots) | |
906 | { | |
907 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); | |
908 | u64 gen; | |
909 | ||
910 | /* | |
911 | * Set the low bit in the generation, which disables SPTE caching | |
912 | * until the end of synchronize_srcu_expedited. | |
913 | */ | |
914 | WARN_ON(old_memslots->generation & 1); | |
915 | slots->generation = old_memslots->generation + 1; | |
916 | ||
917 | rcu_assign_pointer(kvm->memslots[as_id], slots); | |
918 | synchronize_srcu_expedited(&kvm->srcu); | |
919 | ||
920 | /* | |
921 | * Increment the new memslot generation a second time. This prevents | |
922 | * vm exits that race with memslot updates from caching a memslot | |
923 | * generation that will (potentially) be valid forever. | |
924 | * | |
925 | * Generations must be unique even across address spaces. We do not need | |
926 | * a global counter for that, instead the generation space is evenly split | |
927 | * across address spaces. For example, with two address spaces, address | |
928 | * space 0 will use generations 0, 4, 8, ... while * address space 1 will | |
929 | * use generations 2, 6, 10, 14, ... | |
930 | */ | |
931 | gen = slots->generation + KVM_ADDRESS_SPACE_NUM * 2 - 1; | |
932 | ||
933 | kvm_arch_memslots_updated(kvm, gen); | |
934 | ||
935 | slots->generation = gen; | |
936 | ||
937 | return old_memslots; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Allocate some memory and give it an address in the guest physical address | |
942 | * space. | |
943 | * | |
944 | * Discontiguous memory is allowed, mostly for framebuffers. | |
945 | * | |
946 | * Must be called holding kvm->slots_lock for write. | |
947 | */ | |
948 | int __kvm_set_memory_region(struct kvm *kvm, | |
949 | const struct kvm_userspace_memory_region *mem) | |
950 | { | |
951 | int r; | |
952 | gfn_t base_gfn; | |
953 | unsigned long npages; | |
954 | struct kvm_memory_slot *slot; | |
955 | struct kvm_memory_slot old, new; | |
956 | struct kvm_memslots *slots = NULL, *old_memslots; | |
957 | int as_id, id; | |
958 | enum kvm_mr_change change; | |
959 | ||
960 | r = check_memory_region_flags(mem); | |
961 | if (r) | |
962 | goto out; | |
963 | ||
964 | r = -EINVAL; | |
965 | as_id = mem->slot >> 16; | |
966 | id = (u16)mem->slot; | |
967 | ||
968 | /* General sanity checks */ | |
969 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
970 | goto out; | |
971 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
972 | goto out; | |
973 | /* We can read the guest memory with __xxx_user() later on. */ | |
974 | if ((id < KVM_USER_MEM_SLOTS) && | |
975 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
976 | !access_ok(VERIFY_WRITE, | |
977 | (void __user *)(unsigned long)mem->userspace_addr, | |
978 | mem->memory_size))) | |
979 | goto out; | |
980 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) | |
981 | goto out; | |
982 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
983 | goto out; | |
984 | ||
985 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); | |
986 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; | |
987 | npages = mem->memory_size >> PAGE_SHIFT; | |
988 | ||
989 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
990 | goto out; | |
991 | ||
992 | new = old = *slot; | |
993 | ||
994 | new.id = id; | |
995 | new.base_gfn = base_gfn; | |
996 | new.npages = npages; | |
997 | new.flags = mem->flags; | |
998 | ||
999 | if (npages) { | |
1000 | if (!old.npages) | |
1001 | change = KVM_MR_CREATE; | |
1002 | else { /* Modify an existing slot. */ | |
1003 | if ((mem->userspace_addr != old.userspace_addr) || | |
1004 | (npages != old.npages) || | |
1005 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
1006 | goto out; | |
1007 | ||
1008 | if (base_gfn != old.base_gfn) | |
1009 | change = KVM_MR_MOVE; | |
1010 | else if (new.flags != old.flags) | |
1011 | change = KVM_MR_FLAGS_ONLY; | |
1012 | else { /* Nothing to change. */ | |
1013 | r = 0; | |
1014 | goto out; | |
1015 | } | |
1016 | } | |
1017 | } else { | |
1018 | if (!old.npages) | |
1019 | goto out; | |
1020 | ||
1021 | change = KVM_MR_DELETE; | |
1022 | new.base_gfn = 0; | |
1023 | new.flags = 0; | |
1024 | } | |
1025 | ||
1026 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { | |
1027 | /* Check for overlaps */ | |
1028 | r = -EEXIST; | |
1029 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { | |
1030 | if (slot->id == id) | |
1031 | continue; | |
1032 | if (!((base_gfn + npages <= slot->base_gfn) || | |
1033 | (base_gfn >= slot->base_gfn + slot->npages))) | |
1034 | goto out; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | /* Free page dirty bitmap if unneeded */ | |
1039 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
1040 | new.dirty_bitmap = NULL; | |
1041 | ||
1042 | r = -ENOMEM; | |
1043 | if (change == KVM_MR_CREATE) { | |
1044 | new.userspace_addr = mem->userspace_addr; | |
1045 | ||
1046 | if (kvm_arch_create_memslot(kvm, &new, npages)) | |
1047 | goto out_free; | |
1048 | } | |
1049 | ||
1050 | /* Allocate page dirty bitmap if needed */ | |
1051 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
1052 | if (kvm_create_dirty_bitmap(&new) < 0) | |
1053 | goto out_free; | |
1054 | } | |
1055 | ||
1056 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
1057 | if (!slots) | |
1058 | goto out_free; | |
1059 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); | |
1060 | ||
1061 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { | |
1062 | slot = id_to_memslot(slots, id); | |
1063 | slot->flags |= KVM_MEMSLOT_INVALID; | |
1064 | ||
1065 | old_memslots = install_new_memslots(kvm, as_id, slots); | |
1066 | ||
1067 | /* From this point no new shadow pages pointing to a deleted, | |
1068 | * or moved, memslot will be created. | |
1069 | * | |
1070 | * validation of sp->gfn happens in: | |
1071 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
1072 | * - kvm_is_visible_gfn (mmu_check_roots) | |
1073 | */ | |
1074 | kvm_arch_flush_shadow_memslot(kvm, slot); | |
1075 | ||
1076 | /* | |
1077 | * We can re-use the old_memslots from above, the only difference | |
1078 | * from the currently installed memslots is the invalid flag. This | |
1079 | * will get overwritten by update_memslots anyway. | |
1080 | */ | |
1081 | slots = old_memslots; | |
1082 | } | |
1083 | ||
1084 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); | |
1085 | if (r) | |
1086 | goto out_slots; | |
1087 | ||
1088 | /* actual memory is freed via old in kvm_free_memslot below */ | |
1089 | if (change == KVM_MR_DELETE) { | |
1090 | new.dirty_bitmap = NULL; | |
1091 | memset(&new.arch, 0, sizeof(new.arch)); | |
1092 | } | |
1093 | ||
1094 | update_memslots(slots, &new); | |
1095 | old_memslots = install_new_memslots(kvm, as_id, slots); | |
1096 | ||
1097 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); | |
1098 | ||
1099 | kvm_free_memslot(kvm, &old, &new); | |
1100 | kvfree(old_memslots); | |
1101 | return 0; | |
1102 | ||
1103 | out_slots: | |
1104 | kvfree(slots); | |
1105 | out_free: | |
1106 | kvm_free_memslot(kvm, &new, &old); | |
1107 | out: | |
1108 | return r; | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); | |
1111 | ||
1112 | int kvm_set_memory_region(struct kvm *kvm, | |
1113 | const struct kvm_userspace_memory_region *mem) | |
1114 | { | |
1115 | int r; | |
1116 | ||
1117 | mutex_lock(&kvm->slots_lock); | |
1118 | r = __kvm_set_memory_region(kvm, mem); | |
1119 | mutex_unlock(&kvm->slots_lock); | |
1120 | return r; | |
1121 | } | |
1122 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); | |
1123 | ||
1124 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, | |
1125 | struct kvm_userspace_memory_region *mem) | |
1126 | { | |
1127 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) | |
1128 | return -EINVAL; | |
1129 | ||
1130 | return kvm_set_memory_region(kvm, mem); | |
1131 | } | |
1132 | ||
1133 | int kvm_get_dirty_log(struct kvm *kvm, | |
1134 | struct kvm_dirty_log *log, int *is_dirty) | |
1135 | { | |
1136 | struct kvm_memslots *slots; | |
1137 | struct kvm_memory_slot *memslot; | |
1138 | int i, as_id, id; | |
1139 | unsigned long n; | |
1140 | unsigned long any = 0; | |
1141 | ||
1142 | as_id = log->slot >> 16; | |
1143 | id = (u16)log->slot; | |
1144 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1145 | return -EINVAL; | |
1146 | ||
1147 | slots = __kvm_memslots(kvm, as_id); | |
1148 | memslot = id_to_memslot(slots, id); | |
1149 | if (!memslot->dirty_bitmap) | |
1150 | return -ENOENT; | |
1151 | ||
1152 | n = kvm_dirty_bitmap_bytes(memslot); | |
1153 | ||
1154 | for (i = 0; !any && i < n/sizeof(long); ++i) | |
1155 | any = memslot->dirty_bitmap[i]; | |
1156 | ||
1157 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
1158 | return -EFAULT; | |
1159 | ||
1160 | if (any) | |
1161 | *is_dirty = 1; | |
1162 | return 0; | |
1163 | } | |
1164 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); | |
1165 | ||
1166 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT | |
1167 | /** | |
1168 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages | |
1169 | * are dirty write protect them for next write. | |
1170 | * @kvm: pointer to kvm instance | |
1171 | * @log: slot id and address to which we copy the log | |
1172 | * @is_dirty: flag set if any page is dirty | |
1173 | * | |
1174 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1175 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1176 | * following order: | |
1177 | * | |
1178 | * 1. Take a snapshot of the bit and clear it if needed. | |
1179 | * 2. Write protect the corresponding page. | |
1180 | * 3. Copy the snapshot to the userspace. | |
1181 | * 4. Upon return caller flushes TLB's if needed. | |
1182 | * | |
1183 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1184 | * entry. This is not a problem because the page is reported dirty using | |
1185 | * the snapshot taken before and step 4 ensures that writes done after | |
1186 | * exiting to userspace will be logged for the next call. | |
1187 | * | |
1188 | */ | |
1189 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
1190 | struct kvm_dirty_log *log, bool *is_dirty) | |
1191 | { | |
1192 | struct kvm_memslots *slots; | |
1193 | struct kvm_memory_slot *memslot; | |
1194 | int i, as_id, id; | |
1195 | unsigned long n; | |
1196 | unsigned long *dirty_bitmap; | |
1197 | unsigned long *dirty_bitmap_buffer; | |
1198 | ||
1199 | as_id = log->slot >> 16; | |
1200 | id = (u16)log->slot; | |
1201 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1202 | return -EINVAL; | |
1203 | ||
1204 | slots = __kvm_memslots(kvm, as_id); | |
1205 | memslot = id_to_memslot(slots, id); | |
1206 | ||
1207 | dirty_bitmap = memslot->dirty_bitmap; | |
1208 | if (!dirty_bitmap) | |
1209 | return -ENOENT; | |
1210 | ||
1211 | n = kvm_dirty_bitmap_bytes(memslot); | |
1212 | ||
1213 | dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long); | |
1214 | memset(dirty_bitmap_buffer, 0, n); | |
1215 | ||
1216 | spin_lock(&kvm->mmu_lock); | |
1217 | *is_dirty = false; | |
1218 | for (i = 0; i < n / sizeof(long); i++) { | |
1219 | unsigned long mask; | |
1220 | gfn_t offset; | |
1221 | ||
1222 | if (!dirty_bitmap[i]) | |
1223 | continue; | |
1224 | ||
1225 | *is_dirty = true; | |
1226 | ||
1227 | mask = xchg(&dirty_bitmap[i], 0); | |
1228 | dirty_bitmap_buffer[i] = mask; | |
1229 | ||
1230 | if (mask) { | |
1231 | offset = i * BITS_PER_LONG; | |
1232 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1233 | offset, mask); | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | spin_unlock(&kvm->mmu_lock); | |
1238 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1239 | return -EFAULT; | |
1240 | return 0; | |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1243 | #endif | |
1244 | ||
1245 | bool kvm_largepages_enabled(void) | |
1246 | { | |
1247 | return largepages_enabled; | |
1248 | } | |
1249 | ||
1250 | void kvm_disable_largepages(void) | |
1251 | { | |
1252 | largepages_enabled = false; | |
1253 | } | |
1254 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1255 | ||
1256 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
1257 | { | |
1258 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(gfn_to_memslot); | |
1261 | ||
1262 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1263 | { | |
1264 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1265 | } | |
1266 | ||
1267 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) | |
1268 | { | |
1269 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); | |
1270 | ||
1271 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || | |
1272 | memslot->flags & KVM_MEMSLOT_INVALID) | |
1273 | return false; | |
1274 | ||
1275 | return true; | |
1276 | } | |
1277 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1278 | ||
1279 | unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1280 | { | |
1281 | struct vm_area_struct *vma; | |
1282 | unsigned long addr, size; | |
1283 | ||
1284 | size = PAGE_SIZE; | |
1285 | ||
1286 | addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL); | |
1287 | if (kvm_is_error_hva(addr)) | |
1288 | return PAGE_SIZE; | |
1289 | ||
1290 | down_read(¤t->mm->mmap_sem); | |
1291 | vma = find_vma(current->mm, addr); | |
1292 | if (!vma) | |
1293 | goto out; | |
1294 | ||
1295 | size = vma_kernel_pagesize(vma); | |
1296 | ||
1297 | out: | |
1298 | up_read(¤t->mm->mmap_sem); | |
1299 | ||
1300 | return size; | |
1301 | } | |
1302 | ||
1303 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) | |
1304 | { | |
1305 | return slot->flags & KVM_MEM_READONLY; | |
1306 | } | |
1307 | ||
1308 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, | |
1309 | gfn_t *nr_pages, bool write) | |
1310 | { | |
1311 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) | |
1312 | return KVM_HVA_ERR_BAD; | |
1313 | ||
1314 | if (memslot_is_readonly(slot) && write) | |
1315 | return KVM_HVA_ERR_RO_BAD; | |
1316 | ||
1317 | if (nr_pages) | |
1318 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1319 | ||
1320 | return __gfn_to_hva_memslot(slot, gfn); | |
1321 | } | |
1322 | ||
1323 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, | |
1324 | gfn_t *nr_pages) | |
1325 | { | |
1326 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
1327 | } | |
1328 | ||
1329 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, | |
1330 | gfn_t gfn) | |
1331 | { | |
1332 | return gfn_to_hva_many(slot, gfn, NULL); | |
1333 | } | |
1334 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1335 | ||
1336 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1337 | { | |
1338 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); | |
1339 | } | |
1340 | EXPORT_SYMBOL_GPL(gfn_to_hva); | |
1341 | ||
1342 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1343 | { | |
1344 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1347 | ||
1348 | /* | |
1349 | * If writable is set to false, the hva returned by this function is only | |
1350 | * allowed to be read. | |
1351 | */ | |
1352 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, | |
1353 | gfn_t gfn, bool *writable) | |
1354 | { | |
1355 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); | |
1356 | ||
1357 | if (!kvm_is_error_hva(hva) && writable) | |
1358 | *writable = !memslot_is_readonly(slot); | |
1359 | ||
1360 | return hva; | |
1361 | } | |
1362 | ||
1363 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) | |
1364 | { | |
1365 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1366 | ||
1367 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1368 | } | |
1369 | ||
1370 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) | |
1371 | { | |
1372 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1373 | ||
1374 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1375 | } | |
1376 | ||
1377 | static int get_user_page_nowait(unsigned long start, int write, | |
1378 | struct page **page) | |
1379 | { | |
1380 | int flags = FOLL_NOWAIT | FOLL_HWPOISON; | |
1381 | ||
1382 | if (write) | |
1383 | flags |= FOLL_WRITE; | |
1384 | ||
1385 | return get_user_pages(start, 1, flags, page, NULL); | |
1386 | } | |
1387 | ||
1388 | static inline int check_user_page_hwpoison(unsigned long addr) | |
1389 | { | |
1390 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; | |
1391 | ||
1392 | rc = get_user_pages(addr, 1, flags, NULL, NULL); | |
1393 | return rc == -EHWPOISON; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1398 | * true indicates success, otherwise false is returned. | |
1399 | */ | |
1400 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1401 | bool write_fault, bool *writable, kvm_pfn_t *pfn) | |
1402 | { | |
1403 | struct page *page[1]; | |
1404 | int npages; | |
1405 | ||
1406 | if (!(async || atomic)) | |
1407 | return false; | |
1408 | ||
1409 | /* | |
1410 | * Fast pin a writable pfn only if it is a write fault request | |
1411 | * or the caller allows to map a writable pfn for a read fault | |
1412 | * request. | |
1413 | */ | |
1414 | if (!(write_fault || writable)) | |
1415 | return false; | |
1416 | ||
1417 | npages = __get_user_pages_fast(addr, 1, 1, page); | |
1418 | if (npages == 1) { | |
1419 | *pfn = page_to_pfn(page[0]); | |
1420 | ||
1421 | if (writable) | |
1422 | *writable = true; | |
1423 | return true; | |
1424 | } | |
1425 | ||
1426 | return false; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * The slow path to get the pfn of the specified host virtual address, | |
1431 | * 1 indicates success, -errno is returned if error is detected. | |
1432 | */ | |
1433 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1434 | bool *writable, kvm_pfn_t *pfn) | |
1435 | { | |
1436 | struct page *page[1]; | |
1437 | int npages = 0; | |
1438 | ||
1439 | might_sleep(); | |
1440 | ||
1441 | if (writable) | |
1442 | *writable = write_fault; | |
1443 | ||
1444 | if (async) { | |
1445 | down_read(¤t->mm->mmap_sem); | |
1446 | npages = get_user_page_nowait(addr, write_fault, page); | |
1447 | up_read(¤t->mm->mmap_sem); | |
1448 | } else { | |
1449 | unsigned int flags = FOLL_HWPOISON; | |
1450 | ||
1451 | if (write_fault) | |
1452 | flags |= FOLL_WRITE; | |
1453 | ||
1454 | npages = get_user_pages_unlocked(addr, 1, page, flags); | |
1455 | } | |
1456 | if (npages != 1) | |
1457 | return npages; | |
1458 | ||
1459 | /* map read fault as writable if possible */ | |
1460 | if (unlikely(!write_fault) && writable) { | |
1461 | struct page *wpage[1]; | |
1462 | ||
1463 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1464 | if (npages == 1) { | |
1465 | *writable = true; | |
1466 | put_page(page[0]); | |
1467 | page[0] = wpage[0]; | |
1468 | } | |
1469 | ||
1470 | npages = 1; | |
1471 | } | |
1472 | *pfn = page_to_pfn(page[0]); | |
1473 | return npages; | |
1474 | } | |
1475 | ||
1476 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) | |
1477 | { | |
1478 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1479 | return false; | |
1480 | ||
1481 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) | |
1482 | return false; | |
1483 | ||
1484 | return true; | |
1485 | } | |
1486 | ||
1487 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, | |
1488 | unsigned long addr, bool *async, | |
1489 | bool write_fault, bool *writable, | |
1490 | kvm_pfn_t *p_pfn) | |
1491 | { | |
1492 | unsigned long pfn; | |
1493 | int r; | |
1494 | ||
1495 | r = follow_pfn(vma, addr, &pfn); | |
1496 | if (r) { | |
1497 | /* | |
1498 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1499 | * not call the fault handler, so do it here. | |
1500 | */ | |
1501 | bool unlocked = false; | |
1502 | r = fixup_user_fault(current, current->mm, addr, | |
1503 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1504 | &unlocked); | |
1505 | if (unlocked) | |
1506 | return -EAGAIN; | |
1507 | if (r) | |
1508 | return r; | |
1509 | ||
1510 | r = follow_pfn(vma, addr, &pfn); | |
1511 | if (r) | |
1512 | return r; | |
1513 | ||
1514 | } | |
1515 | ||
1516 | if (writable) | |
1517 | *writable = true; | |
1518 | ||
1519 | /* | |
1520 | * Get a reference here because callers of *hva_to_pfn* and | |
1521 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1522 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1523 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1524 | * simply do nothing for reserved pfns. | |
1525 | * | |
1526 | * Whoever called remap_pfn_range is also going to call e.g. | |
1527 | * unmap_mapping_range before the underlying pages are freed, | |
1528 | * causing a call to our MMU notifier. | |
1529 | */ | |
1530 | kvm_get_pfn(pfn); | |
1531 | ||
1532 | *p_pfn = pfn; | |
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Pin guest page in memory and return its pfn. | |
1538 | * @addr: host virtual address which maps memory to the guest | |
1539 | * @atomic: whether this function can sleep | |
1540 | * @async: whether this function need to wait IO complete if the | |
1541 | * host page is not in the memory | |
1542 | * @write_fault: whether we should get a writable host page | |
1543 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1544 | * | |
1545 | * The function will map a writable host page for these two cases: | |
1546 | * 1): @write_fault = true | |
1547 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1548 | * whether the mapping is writable. | |
1549 | */ | |
1550 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, | |
1551 | bool write_fault, bool *writable) | |
1552 | { | |
1553 | struct vm_area_struct *vma; | |
1554 | kvm_pfn_t pfn = 0; | |
1555 | int npages, r; | |
1556 | ||
1557 | /* we can do it either atomically or asynchronously, not both */ | |
1558 | BUG_ON(atomic && async); | |
1559 | ||
1560 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) | |
1561 | return pfn; | |
1562 | ||
1563 | if (atomic) | |
1564 | return KVM_PFN_ERR_FAULT; | |
1565 | ||
1566 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1567 | if (npages == 1) | |
1568 | return pfn; | |
1569 | ||
1570 | down_read(¤t->mm->mmap_sem); | |
1571 | if (npages == -EHWPOISON || | |
1572 | (!async && check_user_page_hwpoison(addr))) { | |
1573 | pfn = KVM_PFN_ERR_HWPOISON; | |
1574 | goto exit; | |
1575 | } | |
1576 | ||
1577 | retry: | |
1578 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1579 | ||
1580 | if (vma == NULL) | |
1581 | pfn = KVM_PFN_ERR_FAULT; | |
1582 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { | |
1583 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); | |
1584 | if (r == -EAGAIN) | |
1585 | goto retry; | |
1586 | if (r < 0) | |
1587 | pfn = KVM_PFN_ERR_FAULT; | |
1588 | } else { | |
1589 | if (async && vma_is_valid(vma, write_fault)) | |
1590 | *async = true; | |
1591 | pfn = KVM_PFN_ERR_FAULT; | |
1592 | } | |
1593 | exit: | |
1594 | up_read(¤t->mm->mmap_sem); | |
1595 | return pfn; | |
1596 | } | |
1597 | ||
1598 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, | |
1599 | bool atomic, bool *async, bool write_fault, | |
1600 | bool *writable) | |
1601 | { | |
1602 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); | |
1603 | ||
1604 | if (addr == KVM_HVA_ERR_RO_BAD) { | |
1605 | if (writable) | |
1606 | *writable = false; | |
1607 | return KVM_PFN_ERR_RO_FAULT; | |
1608 | } | |
1609 | ||
1610 | if (kvm_is_error_hva(addr)) { | |
1611 | if (writable) | |
1612 | *writable = false; | |
1613 | return KVM_PFN_NOSLOT; | |
1614 | } | |
1615 | ||
1616 | /* Do not map writable pfn in the readonly memslot. */ | |
1617 | if (writable && memslot_is_readonly(slot)) { | |
1618 | *writable = false; | |
1619 | writable = NULL; | |
1620 | } | |
1621 | ||
1622 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1623 | writable); | |
1624 | } | |
1625 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); | |
1626 | ||
1627 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, | |
1628 | bool *writable) | |
1629 | { | |
1630 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, | |
1631 | write_fault, writable); | |
1632 | } | |
1633 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1634 | ||
1635 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) | |
1636 | { | |
1637 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); | |
1638 | } | |
1639 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); | |
1640 | ||
1641 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) | |
1642 | { | |
1643 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); | |
1644 | } | |
1645 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); | |
1646 | ||
1647 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1648 | { | |
1649 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1652 | ||
1653 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1654 | { | |
1655 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1656 | } | |
1657 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1658 | ||
1659 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) | |
1660 | { | |
1661 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1662 | } | |
1663 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1664 | ||
1665 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1666 | { | |
1667 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1668 | } | |
1669 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1670 | ||
1671 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, | |
1672 | struct page **pages, int nr_pages) | |
1673 | { | |
1674 | unsigned long addr; | |
1675 | gfn_t entry = 0; | |
1676 | ||
1677 | addr = gfn_to_hva_many(slot, gfn, &entry); | |
1678 | if (kvm_is_error_hva(addr)) | |
1679 | return -1; | |
1680 | ||
1681 | if (entry < nr_pages) | |
1682 | return 0; | |
1683 | ||
1684 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1685 | } | |
1686 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1687 | ||
1688 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) | |
1689 | { | |
1690 | if (is_error_noslot_pfn(pfn)) | |
1691 | return KVM_ERR_PTR_BAD_PAGE; | |
1692 | ||
1693 | if (kvm_is_reserved_pfn(pfn)) { | |
1694 | WARN_ON(1); | |
1695 | return KVM_ERR_PTR_BAD_PAGE; | |
1696 | } | |
1697 | ||
1698 | return pfn_to_page(pfn); | |
1699 | } | |
1700 | ||
1701 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) | |
1702 | { | |
1703 | kvm_pfn_t pfn; | |
1704 | ||
1705 | pfn = gfn_to_pfn(kvm, gfn); | |
1706 | ||
1707 | return kvm_pfn_to_page(pfn); | |
1708 | } | |
1709 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1710 | ||
1711 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1712 | { | |
1713 | kvm_pfn_t pfn; | |
1714 | ||
1715 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1716 | ||
1717 | return kvm_pfn_to_page(pfn); | |
1718 | } | |
1719 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1720 | ||
1721 | void kvm_release_page_clean(struct page *page) | |
1722 | { | |
1723 | WARN_ON(is_error_page(page)); | |
1724 | ||
1725 | kvm_release_pfn_clean(page_to_pfn(page)); | |
1726 | } | |
1727 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1728 | ||
1729 | void kvm_release_pfn_clean(kvm_pfn_t pfn) | |
1730 | { | |
1731 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) | |
1732 | put_page(pfn_to_page(pfn)); | |
1733 | } | |
1734 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1735 | ||
1736 | void kvm_release_page_dirty(struct page *page) | |
1737 | { | |
1738 | WARN_ON(is_error_page(page)); | |
1739 | ||
1740 | kvm_release_pfn_dirty(page_to_pfn(page)); | |
1741 | } | |
1742 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1743 | ||
1744 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) | |
1745 | { | |
1746 | kvm_set_pfn_dirty(pfn); | |
1747 | kvm_release_pfn_clean(pfn); | |
1748 | } | |
1749 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1750 | ||
1751 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) | |
1752 | { | |
1753 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) { | |
1754 | struct page *page = pfn_to_page(pfn); | |
1755 | ||
1756 | if (!PageReserved(page)) | |
1757 | SetPageDirty(page); | |
1758 | } | |
1759 | } | |
1760 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); | |
1761 | ||
1762 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) | |
1763 | { | |
1764 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) | |
1765 | mark_page_accessed(pfn_to_page(pfn)); | |
1766 | } | |
1767 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1768 | ||
1769 | void kvm_get_pfn(kvm_pfn_t pfn) | |
1770 | { | |
1771 | if (!kvm_is_reserved_pfn(pfn)) | |
1772 | get_page(pfn_to_page(pfn)); | |
1773 | } | |
1774 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
1775 | ||
1776 | static int next_segment(unsigned long len, int offset) | |
1777 | { | |
1778 | if (len > PAGE_SIZE - offset) | |
1779 | return PAGE_SIZE - offset; | |
1780 | else | |
1781 | return len; | |
1782 | } | |
1783 | ||
1784 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, | |
1785 | void *data, int offset, int len) | |
1786 | { | |
1787 | int r; | |
1788 | unsigned long addr; | |
1789 | ||
1790 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
1791 | if (kvm_is_error_hva(addr)) | |
1792 | return -EFAULT; | |
1793 | r = __copy_from_user(data, (void __user *)addr + offset, len); | |
1794 | if (r) | |
1795 | return -EFAULT; | |
1796 | return 0; | |
1797 | } | |
1798 | ||
1799 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1800 | int len) | |
1801 | { | |
1802 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1803 | ||
1804 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1805 | } | |
1806 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1807 | ||
1808 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, | |
1809 | int offset, int len) | |
1810 | { | |
1811 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1812 | ||
1813 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1814 | } | |
1815 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1816 | ||
1817 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1818 | { | |
1819 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1820 | int seg; | |
1821 | int offset = offset_in_page(gpa); | |
1822 | int ret; | |
1823 | ||
1824 | while ((seg = next_segment(len, offset)) != 0) { | |
1825 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1826 | if (ret < 0) | |
1827 | return ret; | |
1828 | offset = 0; | |
1829 | len -= seg; | |
1830 | data += seg; | |
1831 | ++gfn; | |
1832 | } | |
1833 | return 0; | |
1834 | } | |
1835 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1836 | ||
1837 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) | |
1838 | { | |
1839 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1840 | int seg; | |
1841 | int offset = offset_in_page(gpa); | |
1842 | int ret; | |
1843 | ||
1844 | while ((seg = next_segment(len, offset)) != 0) { | |
1845 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
1846 | if (ret < 0) | |
1847 | return ret; | |
1848 | offset = 0; | |
1849 | len -= seg; | |
1850 | data += seg; | |
1851 | ++gfn; | |
1852 | } | |
1853 | return 0; | |
1854 | } | |
1855 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
1856 | ||
1857 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, | |
1858 | void *data, int offset, unsigned long len) | |
1859 | { | |
1860 | int r; | |
1861 | unsigned long addr; | |
1862 | ||
1863 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
1864 | if (kvm_is_error_hva(addr)) | |
1865 | return -EFAULT; | |
1866 | pagefault_disable(); | |
1867 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); | |
1868 | pagefault_enable(); | |
1869 | if (r) | |
1870 | return -EFAULT; | |
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, | |
1875 | unsigned long len) | |
1876 | { | |
1877 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1878 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1879 | int offset = offset_in_page(gpa); | |
1880 | ||
1881 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1882 | } | |
1883 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1884 | ||
1885 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1886 | void *data, unsigned long len) | |
1887 | { | |
1888 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1889 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1890 | int offset = offset_in_page(gpa); | |
1891 | ||
1892 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1895 | ||
1896 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1897 | const void *data, int offset, int len) | |
1898 | { | |
1899 | int r; | |
1900 | unsigned long addr; | |
1901 | ||
1902 | addr = gfn_to_hva_memslot(memslot, gfn); | |
1903 | if (kvm_is_error_hva(addr)) | |
1904 | return -EFAULT; | |
1905 | r = __copy_to_user((void __user *)addr + offset, data, len); | |
1906 | if (r) | |
1907 | return -EFAULT; | |
1908 | mark_page_dirty_in_slot(memslot, gfn); | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
1913 | const void *data, int offset, int len) | |
1914 | { | |
1915 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1916 | ||
1917 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1918 | } | |
1919 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1920 | ||
1921 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, | |
1922 | const void *data, int offset, int len) | |
1923 | { | |
1924 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1925 | ||
1926 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1927 | } | |
1928 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
1929 | ||
1930 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1931 | unsigned long len) | |
1932 | { | |
1933 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1934 | int seg; | |
1935 | int offset = offset_in_page(gpa); | |
1936 | int ret; | |
1937 | ||
1938 | while ((seg = next_segment(len, offset)) != 0) { | |
1939 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1940 | if (ret < 0) | |
1941 | return ret; | |
1942 | offset = 0; | |
1943 | len -= seg; | |
1944 | data += seg; | |
1945 | ++gfn; | |
1946 | } | |
1947 | return 0; | |
1948 | } | |
1949 | EXPORT_SYMBOL_GPL(kvm_write_guest); | |
1950 | ||
1951 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, | |
1952 | unsigned long len) | |
1953 | { | |
1954 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1955 | int seg; | |
1956 | int offset = offset_in_page(gpa); | |
1957 | int ret; | |
1958 | ||
1959 | while ((seg = next_segment(len, offset)) != 0) { | |
1960 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
1961 | if (ret < 0) | |
1962 | return ret; | |
1963 | offset = 0; | |
1964 | len -= seg; | |
1965 | data += seg; | |
1966 | ++gfn; | |
1967 | } | |
1968 | return 0; | |
1969 | } | |
1970 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
1971 | ||
1972 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, | |
1973 | struct gfn_to_hva_cache *ghc, | |
1974 | gpa_t gpa, unsigned long len) | |
1975 | { | |
1976 | int offset = offset_in_page(gpa); | |
1977 | gfn_t start_gfn = gpa >> PAGE_SHIFT; | |
1978 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1979 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1980 | gfn_t nr_pages_avail; | |
1981 | ||
1982 | ghc->gpa = gpa; | |
1983 | ghc->generation = slots->generation; | |
1984 | ghc->len = len; | |
1985 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
1986 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); | |
1987 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { | |
1988 | ghc->hva += offset; | |
1989 | } else { | |
1990 | /* | |
1991 | * If the requested region crosses two memslots, we still | |
1992 | * verify that the entire region is valid here. | |
1993 | */ | |
1994 | while (start_gfn <= end_gfn) { | |
1995 | nr_pages_avail = 0; | |
1996 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
1997 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
1998 | &nr_pages_avail); | |
1999 | if (kvm_is_error_hva(ghc->hva)) | |
2000 | return -EFAULT; | |
2001 | start_gfn += nr_pages_avail; | |
2002 | } | |
2003 | /* Use the slow path for cross page reads and writes. */ | |
2004 | ghc->memslot = NULL; | |
2005 | } | |
2006 | return 0; | |
2007 | } | |
2008 | ||
2009 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
2010 | gpa_t gpa, unsigned long len) | |
2011 | { | |
2012 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
2013 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); | |
2014 | } | |
2015 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
2016 | ||
2017 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
2018 | void *data, unsigned int offset, | |
2019 | unsigned long len) | |
2020 | { | |
2021 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
2022 | int r; | |
2023 | gpa_t gpa = ghc->gpa + offset; | |
2024 | ||
2025 | BUG_ON(len + offset > ghc->len); | |
2026 | ||
2027 | if (slots->generation != ghc->generation) | |
2028 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); | |
2029 | ||
2030 | if (unlikely(!ghc->memslot)) | |
2031 | return kvm_write_guest(kvm, gpa, data, len); | |
2032 | ||
2033 | if (kvm_is_error_hva(ghc->hva)) | |
2034 | return -EFAULT; | |
2035 | ||
2036 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); | |
2037 | if (r) | |
2038 | return -EFAULT; | |
2039 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); | |
2040 | ||
2041 | return 0; | |
2042 | } | |
2043 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); | |
2044 | ||
2045 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
2046 | void *data, unsigned long len) | |
2047 | { | |
2048 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); | |
2049 | } | |
2050 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
2051 | ||
2052 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
2053 | void *data, unsigned long len) | |
2054 | { | |
2055 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
2056 | int r; | |
2057 | ||
2058 | BUG_ON(len > ghc->len); | |
2059 | ||
2060 | if (slots->generation != ghc->generation) | |
2061 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); | |
2062 | ||
2063 | if (unlikely(!ghc->memslot)) | |
2064 | return kvm_read_guest(kvm, ghc->gpa, data, len); | |
2065 | ||
2066 | if (kvm_is_error_hva(ghc->hva)) | |
2067 | return -EFAULT; | |
2068 | ||
2069 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2070 | if (r) | |
2071 | return -EFAULT; | |
2072 | ||
2073 | return 0; | |
2074 | } | |
2075 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
2076 | ||
2077 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
2078 | { | |
2079 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); | |
2080 | ||
2081 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
2082 | } | |
2083 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2084 | ||
2085 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2086 | { | |
2087 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2088 | int seg; | |
2089 | int offset = offset_in_page(gpa); | |
2090 | int ret; | |
2091 | ||
2092 | while ((seg = next_segment(len, offset)) != 0) { | |
2093 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
2094 | if (ret < 0) | |
2095 | return ret; | |
2096 | offset = 0; | |
2097 | len -= seg; | |
2098 | ++gfn; | |
2099 | } | |
2100 | return 0; | |
2101 | } | |
2102 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2103 | ||
2104 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, | |
2105 | gfn_t gfn) | |
2106 | { | |
2107 | if (memslot && memslot->dirty_bitmap) { | |
2108 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
2109 | ||
2110 | set_bit_le(rel_gfn, memslot->dirty_bitmap); | |
2111 | } | |
2112 | } | |
2113 | ||
2114 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) | |
2115 | { | |
2116 | struct kvm_memory_slot *memslot; | |
2117 | ||
2118 | memslot = gfn_to_memslot(kvm, gfn); | |
2119 | mark_page_dirty_in_slot(memslot, gfn); | |
2120 | } | |
2121 | EXPORT_SYMBOL_GPL(mark_page_dirty); | |
2122 | ||
2123 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) | |
2124 | { | |
2125 | struct kvm_memory_slot *memslot; | |
2126 | ||
2127 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2128 | mark_page_dirty_in_slot(memslot, gfn); | |
2129 | } | |
2130 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2131 | ||
2132 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) | |
2133 | { | |
2134 | if (!vcpu->sigset_active) | |
2135 | return; | |
2136 | ||
2137 | /* | |
2138 | * This does a lockless modification of ->real_blocked, which is fine | |
2139 | * because, only current can change ->real_blocked and all readers of | |
2140 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2141 | * of ->blocked. | |
2142 | */ | |
2143 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2144 | } | |
2145 | ||
2146 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2147 | { | |
2148 | if (!vcpu->sigset_active) | |
2149 | return; | |
2150 | ||
2151 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2152 | sigemptyset(¤t->real_blocked); | |
2153 | } | |
2154 | ||
2155 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2156 | { | |
2157 | unsigned int old, val, grow; | |
2158 | ||
2159 | old = val = vcpu->halt_poll_ns; | |
2160 | grow = READ_ONCE(halt_poll_ns_grow); | |
2161 | /* 10us base */ | |
2162 | if (val == 0 && grow) | |
2163 | val = 10000; | |
2164 | else | |
2165 | val *= grow; | |
2166 | ||
2167 | if (val > halt_poll_ns) | |
2168 | val = halt_poll_ns; | |
2169 | ||
2170 | vcpu->halt_poll_ns = val; | |
2171 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); | |
2172 | } | |
2173 | ||
2174 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2175 | { | |
2176 | unsigned int old, val, shrink; | |
2177 | ||
2178 | old = val = vcpu->halt_poll_ns; | |
2179 | shrink = READ_ONCE(halt_poll_ns_shrink); | |
2180 | if (shrink == 0) | |
2181 | val = 0; | |
2182 | else | |
2183 | val /= shrink; | |
2184 | ||
2185 | vcpu->halt_poll_ns = val; | |
2186 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); | |
2187 | } | |
2188 | ||
2189 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) | |
2190 | { | |
2191 | if (kvm_arch_vcpu_runnable(vcpu)) { | |
2192 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
2193 | return -EINTR; | |
2194 | } | |
2195 | if (kvm_cpu_has_pending_timer(vcpu)) | |
2196 | return -EINTR; | |
2197 | if (signal_pending(current)) | |
2198 | return -EINTR; | |
2199 | ||
2200 | return 0; | |
2201 | } | |
2202 | ||
2203 | /* | |
2204 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2205 | */ | |
2206 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) | |
2207 | { | |
2208 | ktime_t start, cur; | |
2209 | DECLARE_SWAITQUEUE(wait); | |
2210 | bool waited = false; | |
2211 | u64 block_ns; | |
2212 | ||
2213 | start = cur = ktime_get(); | |
2214 | if (vcpu->halt_poll_ns) { | |
2215 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); | |
2216 | ||
2217 | ++vcpu->stat.halt_attempted_poll; | |
2218 | do { | |
2219 | /* | |
2220 | * This sets KVM_REQ_UNHALT if an interrupt | |
2221 | * arrives. | |
2222 | */ | |
2223 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2224 | ++vcpu->stat.halt_successful_poll; | |
2225 | if (!vcpu_valid_wakeup(vcpu)) | |
2226 | ++vcpu->stat.halt_poll_invalid; | |
2227 | goto out; | |
2228 | } | |
2229 | cur = ktime_get(); | |
2230 | } while (single_task_running() && ktime_before(cur, stop)); | |
2231 | } | |
2232 | ||
2233 | kvm_arch_vcpu_blocking(vcpu); | |
2234 | ||
2235 | for (;;) { | |
2236 | prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
2237 | ||
2238 | if (kvm_vcpu_check_block(vcpu) < 0) | |
2239 | break; | |
2240 | ||
2241 | waited = true; | |
2242 | schedule(); | |
2243 | } | |
2244 | ||
2245 | finish_swait(&vcpu->wq, &wait); | |
2246 | cur = ktime_get(); | |
2247 | ||
2248 | kvm_arch_vcpu_unblocking(vcpu); | |
2249 | out: | |
2250 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); | |
2251 | ||
2252 | if (!vcpu_valid_wakeup(vcpu)) | |
2253 | shrink_halt_poll_ns(vcpu); | |
2254 | else if (halt_poll_ns) { | |
2255 | if (block_ns <= vcpu->halt_poll_ns) | |
2256 | ; | |
2257 | /* we had a long block, shrink polling */ | |
2258 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) | |
2259 | shrink_halt_poll_ns(vcpu); | |
2260 | /* we had a short halt and our poll time is too small */ | |
2261 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2262 | block_ns < halt_poll_ns) | |
2263 | grow_halt_poll_ns(vcpu); | |
2264 | } else | |
2265 | vcpu->halt_poll_ns = 0; | |
2266 | ||
2267 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); | |
2268 | kvm_arch_vcpu_block_finish(vcpu); | |
2269 | } | |
2270 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); | |
2271 | ||
2272 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) | |
2273 | { | |
2274 | struct swait_queue_head *wqp; | |
2275 | ||
2276 | wqp = kvm_arch_vcpu_wq(vcpu); | |
2277 | if (swq_has_sleeper(wqp)) { | |
2278 | swake_up(wqp); | |
2279 | ++vcpu->stat.halt_wakeup; | |
2280 | return true; | |
2281 | } | |
2282 | ||
2283 | return false; | |
2284 | } | |
2285 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2286 | ||
2287 | #ifndef CONFIG_S390 | |
2288 | /* | |
2289 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2290 | */ | |
2291 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2292 | { | |
2293 | int me; | |
2294 | int cpu = vcpu->cpu; | |
2295 | ||
2296 | if (kvm_vcpu_wake_up(vcpu)) | |
2297 | return; | |
2298 | ||
2299 | me = get_cpu(); | |
2300 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2301 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2302 | smp_send_reschedule(cpu); | |
2303 | put_cpu(); | |
2304 | } | |
2305 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); | |
2306 | #endif /* !CONFIG_S390 */ | |
2307 | ||
2308 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) | |
2309 | { | |
2310 | struct pid *pid; | |
2311 | struct task_struct *task = NULL; | |
2312 | int ret = 0; | |
2313 | ||
2314 | rcu_read_lock(); | |
2315 | pid = rcu_dereference(target->pid); | |
2316 | if (pid) | |
2317 | task = get_pid_task(pid, PIDTYPE_PID); | |
2318 | rcu_read_unlock(); | |
2319 | if (!task) | |
2320 | return ret; | |
2321 | ret = yield_to(task, 1); | |
2322 | put_task_struct(task); | |
2323 | ||
2324 | return ret; | |
2325 | } | |
2326 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2327 | ||
2328 | /* | |
2329 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2330 | * Most eligible candidate to yield is decided by following heuristics: | |
2331 | * | |
2332 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2333 | * (preempted lock holder), indicated by @in_spin_loop. | |
2334 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2335 | * | |
2336 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2337 | * chance last time (mostly it has become eligible now since we have probably | |
2338 | * yielded to lockholder in last iteration. This is done by toggling | |
2339 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2340 | * | |
2341 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2342 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2343 | * burning. Giving priority for a potential lock-holder increases lock | |
2344 | * progress. | |
2345 | * | |
2346 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2347 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2348 | * and continue with next VCPU and so on. | |
2349 | */ | |
2350 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) | |
2351 | { | |
2352 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT | |
2353 | bool eligible; | |
2354 | ||
2355 | eligible = !vcpu->spin_loop.in_spin_loop || | |
2356 | vcpu->spin_loop.dy_eligible; | |
2357 | ||
2358 | if (vcpu->spin_loop.in_spin_loop) | |
2359 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2360 | ||
2361 | return eligible; | |
2362 | #else | |
2363 | return true; | |
2364 | #endif | |
2365 | } | |
2366 | ||
2367 | /* | |
2368 | * Unlike kvm_arch_vcpu_runnable, this function is called outside | |
2369 | * a vcpu_load/vcpu_put pair. However, for most architectures | |
2370 | * kvm_arch_vcpu_runnable does not require vcpu_load. | |
2371 | */ | |
2372 | bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) | |
2373 | { | |
2374 | return kvm_arch_vcpu_runnable(vcpu); | |
2375 | } | |
2376 | ||
2377 | static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu) | |
2378 | { | |
2379 | if (kvm_arch_dy_runnable(vcpu)) | |
2380 | return true; | |
2381 | ||
2382 | #ifdef CONFIG_KVM_ASYNC_PF | |
2383 | if (!list_empty_careful(&vcpu->async_pf.done)) | |
2384 | return true; | |
2385 | #endif | |
2386 | ||
2387 | return false; | |
2388 | } | |
2389 | ||
2390 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) | |
2391 | { | |
2392 | struct kvm *kvm = me->kvm; | |
2393 | struct kvm_vcpu *vcpu; | |
2394 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2395 | int yielded = 0; | |
2396 | int try = 3; | |
2397 | int pass; | |
2398 | int i; | |
2399 | ||
2400 | kvm_vcpu_set_in_spin_loop(me, true); | |
2401 | /* | |
2402 | * We boost the priority of a VCPU that is runnable but not | |
2403 | * currently running, because it got preempted by something | |
2404 | * else and called schedule in __vcpu_run. Hopefully that | |
2405 | * VCPU is holding the lock that we need and will release it. | |
2406 | * We approximate round-robin by starting at the last boosted VCPU. | |
2407 | */ | |
2408 | for (pass = 0; pass < 2 && !yielded && try; pass++) { | |
2409 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
2410 | if (!pass && i <= last_boosted_vcpu) { | |
2411 | i = last_boosted_vcpu; | |
2412 | continue; | |
2413 | } else if (pass && i > last_boosted_vcpu) | |
2414 | break; | |
2415 | if (!READ_ONCE(vcpu->preempted)) | |
2416 | continue; | |
2417 | if (vcpu == me) | |
2418 | continue; | |
2419 | if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu)) | |
2420 | continue; | |
2421 | if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu)) | |
2422 | continue; | |
2423 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) | |
2424 | continue; | |
2425 | ||
2426 | yielded = kvm_vcpu_yield_to(vcpu); | |
2427 | if (yielded > 0) { | |
2428 | kvm->last_boosted_vcpu = i; | |
2429 | break; | |
2430 | } else if (yielded < 0) { | |
2431 | try--; | |
2432 | if (!try) | |
2433 | break; | |
2434 | } | |
2435 | } | |
2436 | } | |
2437 | kvm_vcpu_set_in_spin_loop(me, false); | |
2438 | ||
2439 | /* Ensure vcpu is not eligible during next spinloop */ | |
2440 | kvm_vcpu_set_dy_eligible(me, false); | |
2441 | } | |
2442 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2443 | ||
2444 | static int kvm_vcpu_fault(struct vm_fault *vmf) | |
2445 | { | |
2446 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; | |
2447 | struct page *page; | |
2448 | ||
2449 | if (vmf->pgoff == 0) | |
2450 | page = virt_to_page(vcpu->run); | |
2451 | #ifdef CONFIG_X86 | |
2452 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) | |
2453 | page = virt_to_page(vcpu->arch.pio_data); | |
2454 | #endif | |
2455 | #ifdef CONFIG_KVM_MMIO | |
2456 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
2457 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
2458 | #endif | |
2459 | else | |
2460 | return kvm_arch_vcpu_fault(vcpu, vmf); | |
2461 | get_page(page); | |
2462 | vmf->page = page; | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { | |
2467 | .fault = kvm_vcpu_fault, | |
2468 | }; | |
2469 | ||
2470 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2471 | { | |
2472 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) | |
2477 | { | |
2478 | struct kvm_vcpu *vcpu = filp->private_data; | |
2479 | ||
2480 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2481 | kvm_put_kvm(vcpu->kvm); | |
2482 | return 0; | |
2483 | } | |
2484 | ||
2485 | static struct file_operations kvm_vcpu_fops = { | |
2486 | .release = kvm_vcpu_release, | |
2487 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
2488 | #ifdef CONFIG_KVM_COMPAT | |
2489 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
2490 | #endif | |
2491 | .mmap = kvm_vcpu_mmap, | |
2492 | .llseek = noop_llseek, | |
2493 | }; | |
2494 | ||
2495 | /* | |
2496 | * Allocates an inode for the vcpu. | |
2497 | */ | |
2498 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2499 | { | |
2500 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
2501 | } | |
2502 | ||
2503 | static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) | |
2504 | { | |
2505 | char dir_name[ITOA_MAX_LEN * 2]; | |
2506 | int ret; | |
2507 | ||
2508 | if (!kvm_arch_has_vcpu_debugfs()) | |
2509 | return 0; | |
2510 | ||
2511 | if (!debugfs_initialized()) | |
2512 | return 0; | |
2513 | ||
2514 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2515 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
2516 | vcpu->kvm->debugfs_dentry); | |
2517 | if (!vcpu->debugfs_dentry) | |
2518 | return -ENOMEM; | |
2519 | ||
2520 | ret = kvm_arch_create_vcpu_debugfs(vcpu); | |
2521 | if (ret < 0) { | |
2522 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2523 | return ret; | |
2524 | } | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * Creates some virtual cpus. Good luck creating more than one. | |
2531 | */ | |
2532 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) | |
2533 | { | |
2534 | int r; | |
2535 | struct kvm_vcpu *vcpu; | |
2536 | ||
2537 | if (id >= KVM_MAX_VCPU_ID) | |
2538 | return -EINVAL; | |
2539 | ||
2540 | mutex_lock(&kvm->lock); | |
2541 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2542 | mutex_unlock(&kvm->lock); | |
2543 | return -EINVAL; | |
2544 | } | |
2545 | ||
2546 | kvm->created_vcpus++; | |
2547 | mutex_unlock(&kvm->lock); | |
2548 | ||
2549 | vcpu = kvm_arch_vcpu_create(kvm, id); | |
2550 | if (IS_ERR(vcpu)) { | |
2551 | r = PTR_ERR(vcpu); | |
2552 | goto vcpu_decrement; | |
2553 | } | |
2554 | ||
2555 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); | |
2556 | ||
2557 | r = kvm_arch_vcpu_setup(vcpu); | |
2558 | if (r) | |
2559 | goto vcpu_destroy; | |
2560 | ||
2561 | r = kvm_create_vcpu_debugfs(vcpu); | |
2562 | if (r) | |
2563 | goto vcpu_destroy; | |
2564 | ||
2565 | mutex_lock(&kvm->lock); | |
2566 | if (kvm_get_vcpu_by_id(kvm, id)) { | |
2567 | r = -EEXIST; | |
2568 | goto unlock_vcpu_destroy; | |
2569 | } | |
2570 | ||
2571 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
2572 | ||
2573 | /* Now it's all set up, let userspace reach it */ | |
2574 | kvm_get_kvm(kvm); | |
2575 | r = create_vcpu_fd(vcpu); | |
2576 | if (r < 0) { | |
2577 | kvm_put_kvm(kvm); | |
2578 | goto unlock_vcpu_destroy; | |
2579 | } | |
2580 | ||
2581 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
2582 | ||
2583 | /* | |
2584 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2585 | * before kvm->online_vcpu's incremented value. | |
2586 | */ | |
2587 | smp_wmb(); | |
2588 | atomic_inc(&kvm->online_vcpus); | |
2589 | ||
2590 | mutex_unlock(&kvm->lock); | |
2591 | kvm_arch_vcpu_postcreate(vcpu); | |
2592 | return r; | |
2593 | ||
2594 | unlock_vcpu_destroy: | |
2595 | mutex_unlock(&kvm->lock); | |
2596 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2597 | vcpu_destroy: | |
2598 | kvm_arch_vcpu_destroy(vcpu); | |
2599 | vcpu_decrement: | |
2600 | mutex_lock(&kvm->lock); | |
2601 | kvm->created_vcpus--; | |
2602 | mutex_unlock(&kvm->lock); | |
2603 | return r; | |
2604 | } | |
2605 | ||
2606 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) | |
2607 | { | |
2608 | if (sigset) { | |
2609 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2610 | vcpu->sigset_active = 1; | |
2611 | vcpu->sigset = *sigset; | |
2612 | } else | |
2613 | vcpu->sigset_active = 0; | |
2614 | return 0; | |
2615 | } | |
2616 | ||
2617 | static long kvm_vcpu_ioctl(struct file *filp, | |
2618 | unsigned int ioctl, unsigned long arg) | |
2619 | { | |
2620 | struct kvm_vcpu *vcpu = filp->private_data; | |
2621 | void __user *argp = (void __user *)arg; | |
2622 | int r; | |
2623 | struct kvm_fpu *fpu = NULL; | |
2624 | struct kvm_sregs *kvm_sregs = NULL; | |
2625 | ||
2626 | if (vcpu->kvm->mm != current->mm) | |
2627 | return -EIO; | |
2628 | ||
2629 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) | |
2630 | return -EINVAL; | |
2631 | ||
2632 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) | |
2633 | /* | |
2634 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
2635 | * so vcpu_load() would break it. | |
2636 | */ | |
2637 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT) | |
2638 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
2639 | #endif | |
2640 | ||
2641 | ||
2642 | r = vcpu_load(vcpu); | |
2643 | if (r) | |
2644 | return r; | |
2645 | switch (ioctl) { | |
2646 | case KVM_RUN: { | |
2647 | struct pid *oldpid; | |
2648 | r = -EINVAL; | |
2649 | if (arg) | |
2650 | goto out; | |
2651 | oldpid = rcu_access_pointer(vcpu->pid); | |
2652 | if (unlikely(oldpid != current->pids[PIDTYPE_PID].pid)) { | |
2653 | /* The thread running this VCPU changed. */ | |
2654 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
2655 | ||
2656 | rcu_assign_pointer(vcpu->pid, newpid); | |
2657 | if (oldpid) | |
2658 | synchronize_rcu(); | |
2659 | put_pid(oldpid); | |
2660 | } | |
2661 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); | |
2662 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); | |
2663 | break; | |
2664 | } | |
2665 | case KVM_GET_REGS: { | |
2666 | struct kvm_regs *kvm_regs; | |
2667 | ||
2668 | r = -ENOMEM; | |
2669 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2670 | if (!kvm_regs) | |
2671 | goto out; | |
2672 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); | |
2673 | if (r) | |
2674 | goto out_free1; | |
2675 | r = -EFAULT; | |
2676 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) | |
2677 | goto out_free1; | |
2678 | r = 0; | |
2679 | out_free1: | |
2680 | kfree(kvm_regs); | |
2681 | break; | |
2682 | } | |
2683 | case KVM_SET_REGS: { | |
2684 | struct kvm_regs *kvm_regs; | |
2685 | ||
2686 | r = -ENOMEM; | |
2687 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); | |
2688 | if (IS_ERR(kvm_regs)) { | |
2689 | r = PTR_ERR(kvm_regs); | |
2690 | goto out; | |
2691 | } | |
2692 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
2693 | kfree(kvm_regs); | |
2694 | break; | |
2695 | } | |
2696 | case KVM_GET_SREGS: { | |
2697 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); | |
2698 | r = -ENOMEM; | |
2699 | if (!kvm_sregs) | |
2700 | goto out; | |
2701 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
2702 | if (r) | |
2703 | goto out; | |
2704 | r = -EFAULT; | |
2705 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) | |
2706 | goto out; | |
2707 | r = 0; | |
2708 | break; | |
2709 | } | |
2710 | case KVM_SET_SREGS: { | |
2711 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); | |
2712 | if (IS_ERR(kvm_sregs)) { | |
2713 | r = PTR_ERR(kvm_sregs); | |
2714 | kvm_sregs = NULL; | |
2715 | goto out; | |
2716 | } | |
2717 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); | |
2718 | break; | |
2719 | } | |
2720 | case KVM_GET_MP_STATE: { | |
2721 | struct kvm_mp_state mp_state; | |
2722 | ||
2723 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2724 | if (r) | |
2725 | goto out; | |
2726 | r = -EFAULT; | |
2727 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) | |
2728 | goto out; | |
2729 | r = 0; | |
2730 | break; | |
2731 | } | |
2732 | case KVM_SET_MP_STATE: { | |
2733 | struct kvm_mp_state mp_state; | |
2734 | ||
2735 | r = -EFAULT; | |
2736 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) | |
2737 | goto out; | |
2738 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
2739 | break; | |
2740 | } | |
2741 | case KVM_TRANSLATE: { | |
2742 | struct kvm_translation tr; | |
2743 | ||
2744 | r = -EFAULT; | |
2745 | if (copy_from_user(&tr, argp, sizeof(tr))) | |
2746 | goto out; | |
2747 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); | |
2748 | if (r) | |
2749 | goto out; | |
2750 | r = -EFAULT; | |
2751 | if (copy_to_user(argp, &tr, sizeof(tr))) | |
2752 | goto out; | |
2753 | r = 0; | |
2754 | break; | |
2755 | } | |
2756 | case KVM_SET_GUEST_DEBUG: { | |
2757 | struct kvm_guest_debug dbg; | |
2758 | ||
2759 | r = -EFAULT; | |
2760 | if (copy_from_user(&dbg, argp, sizeof(dbg))) | |
2761 | goto out; | |
2762 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); | |
2763 | break; | |
2764 | } | |
2765 | case KVM_SET_SIGNAL_MASK: { | |
2766 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2767 | struct kvm_signal_mask kvm_sigmask; | |
2768 | sigset_t sigset, *p; | |
2769 | ||
2770 | p = NULL; | |
2771 | if (argp) { | |
2772 | r = -EFAULT; | |
2773 | if (copy_from_user(&kvm_sigmask, argp, | |
2774 | sizeof(kvm_sigmask))) | |
2775 | goto out; | |
2776 | r = -EINVAL; | |
2777 | if (kvm_sigmask.len != sizeof(sigset)) | |
2778 | goto out; | |
2779 | r = -EFAULT; | |
2780 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
2781 | sizeof(sigset))) | |
2782 | goto out; | |
2783 | p = &sigset; | |
2784 | } | |
2785 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); | |
2786 | break; | |
2787 | } | |
2788 | case KVM_GET_FPU: { | |
2789 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); | |
2790 | r = -ENOMEM; | |
2791 | if (!fpu) | |
2792 | goto out; | |
2793 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
2794 | if (r) | |
2795 | goto out; | |
2796 | r = -EFAULT; | |
2797 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) | |
2798 | goto out; | |
2799 | r = 0; | |
2800 | break; | |
2801 | } | |
2802 | case KVM_SET_FPU: { | |
2803 | fpu = memdup_user(argp, sizeof(*fpu)); | |
2804 | if (IS_ERR(fpu)) { | |
2805 | r = PTR_ERR(fpu); | |
2806 | fpu = NULL; | |
2807 | goto out; | |
2808 | } | |
2809 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); | |
2810 | break; | |
2811 | } | |
2812 | default: | |
2813 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
2814 | } | |
2815 | out: | |
2816 | vcpu_put(vcpu); | |
2817 | kfree(fpu); | |
2818 | kfree(kvm_sregs); | |
2819 | return r; | |
2820 | } | |
2821 | ||
2822 | #ifdef CONFIG_KVM_COMPAT | |
2823 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
2824 | unsigned int ioctl, unsigned long arg) | |
2825 | { | |
2826 | struct kvm_vcpu *vcpu = filp->private_data; | |
2827 | void __user *argp = compat_ptr(arg); | |
2828 | int r; | |
2829 | ||
2830 | if (vcpu->kvm->mm != current->mm) | |
2831 | return -EIO; | |
2832 | ||
2833 | switch (ioctl) { | |
2834 | case KVM_SET_SIGNAL_MASK: { | |
2835 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2836 | struct kvm_signal_mask kvm_sigmask; | |
2837 | sigset_t sigset; | |
2838 | ||
2839 | if (argp) { | |
2840 | r = -EFAULT; | |
2841 | if (copy_from_user(&kvm_sigmask, argp, | |
2842 | sizeof(kvm_sigmask))) | |
2843 | goto out; | |
2844 | r = -EINVAL; | |
2845 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) | |
2846 | goto out; | |
2847 | r = -EFAULT; | |
2848 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) | |
2849 | goto out; | |
2850 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2851 | } else | |
2852 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
2853 | break; | |
2854 | } | |
2855 | default: | |
2856 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2857 | } | |
2858 | ||
2859 | out: | |
2860 | return r; | |
2861 | } | |
2862 | #endif | |
2863 | ||
2864 | static int kvm_device_ioctl_attr(struct kvm_device *dev, | |
2865 | int (*accessor)(struct kvm_device *dev, | |
2866 | struct kvm_device_attr *attr), | |
2867 | unsigned long arg) | |
2868 | { | |
2869 | struct kvm_device_attr attr; | |
2870 | ||
2871 | if (!accessor) | |
2872 | return -EPERM; | |
2873 | ||
2874 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2875 | return -EFAULT; | |
2876 | ||
2877 | return accessor(dev, &attr); | |
2878 | } | |
2879 | ||
2880 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2881 | unsigned long arg) | |
2882 | { | |
2883 | struct kvm_device *dev = filp->private_data; | |
2884 | ||
2885 | if (dev->kvm->mm != current->mm) | |
2886 | return -EIO; | |
2887 | ||
2888 | switch (ioctl) { | |
2889 | case KVM_SET_DEVICE_ATTR: | |
2890 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2891 | case KVM_GET_DEVICE_ATTR: | |
2892 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2893 | case KVM_HAS_DEVICE_ATTR: | |
2894 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2895 | default: | |
2896 | if (dev->ops->ioctl) | |
2897 | return dev->ops->ioctl(dev, ioctl, arg); | |
2898 | ||
2899 | return -ENOTTY; | |
2900 | } | |
2901 | } | |
2902 | ||
2903 | static int kvm_device_release(struct inode *inode, struct file *filp) | |
2904 | { | |
2905 | struct kvm_device *dev = filp->private_data; | |
2906 | struct kvm *kvm = dev->kvm; | |
2907 | ||
2908 | kvm_put_kvm(kvm); | |
2909 | return 0; | |
2910 | } | |
2911 | ||
2912 | static const struct file_operations kvm_device_fops = { | |
2913 | .unlocked_ioctl = kvm_device_ioctl, | |
2914 | #ifdef CONFIG_KVM_COMPAT | |
2915 | .compat_ioctl = kvm_device_ioctl, | |
2916 | #endif | |
2917 | .release = kvm_device_release, | |
2918 | }; | |
2919 | ||
2920 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2921 | { | |
2922 | if (filp->f_op != &kvm_device_fops) | |
2923 | return NULL; | |
2924 | ||
2925 | return filp->private_data; | |
2926 | } | |
2927 | ||
2928 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { | |
2929 | #ifdef CONFIG_KVM_MPIC | |
2930 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, | |
2931 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
2932 | #endif | |
2933 | }; | |
2934 | ||
2935 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2936 | { | |
2937 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2938 | return -ENOSPC; | |
2939 | ||
2940 | if (kvm_device_ops_table[type] != NULL) | |
2941 | return -EEXIST; | |
2942 | ||
2943 | kvm_device_ops_table[type] = ops; | |
2944 | return 0; | |
2945 | } | |
2946 | ||
2947 | void kvm_unregister_device_ops(u32 type) | |
2948 | { | |
2949 | if (kvm_device_ops_table[type] != NULL) | |
2950 | kvm_device_ops_table[type] = NULL; | |
2951 | } | |
2952 | ||
2953 | static int kvm_ioctl_create_device(struct kvm *kvm, | |
2954 | struct kvm_create_device *cd) | |
2955 | { | |
2956 | struct kvm_device_ops *ops = NULL; | |
2957 | struct kvm_device *dev; | |
2958 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2959 | int type; | |
2960 | int ret; | |
2961 | ||
2962 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2963 | return -ENODEV; | |
2964 | ||
2965 | type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table)); | |
2966 | ops = kvm_device_ops_table[type]; | |
2967 | if (ops == NULL) | |
2968 | return -ENODEV; | |
2969 | ||
2970 | if (test) | |
2971 | return 0; | |
2972 | ||
2973 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2974 | if (!dev) | |
2975 | return -ENOMEM; | |
2976 | ||
2977 | dev->ops = ops; | |
2978 | dev->kvm = kvm; | |
2979 | ||
2980 | mutex_lock(&kvm->lock); | |
2981 | ret = ops->create(dev, type); | |
2982 | if (ret < 0) { | |
2983 | mutex_unlock(&kvm->lock); | |
2984 | kfree(dev); | |
2985 | return ret; | |
2986 | } | |
2987 | list_add(&dev->vm_node, &kvm->devices); | |
2988 | mutex_unlock(&kvm->lock); | |
2989 | ||
2990 | if (ops->init) | |
2991 | ops->init(dev); | |
2992 | ||
2993 | kvm_get_kvm(kvm); | |
2994 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); | |
2995 | if (ret < 0) { | |
2996 | kvm_put_kvm(kvm); | |
2997 | mutex_lock(&kvm->lock); | |
2998 | list_del(&dev->vm_node); | |
2999 | mutex_unlock(&kvm->lock); | |
3000 | ops->destroy(dev); | |
3001 | return ret; | |
3002 | } | |
3003 | ||
3004 | cd->fd = ret; | |
3005 | return 0; | |
3006 | } | |
3007 | ||
3008 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) | |
3009 | { | |
3010 | switch (arg) { | |
3011 | case KVM_CAP_USER_MEMORY: | |
3012 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
3013 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
3014 | case KVM_CAP_INTERNAL_ERROR_DATA: | |
3015 | #ifdef CONFIG_HAVE_KVM_MSI | |
3016 | case KVM_CAP_SIGNAL_MSI: | |
3017 | #endif | |
3018 | #ifdef CONFIG_HAVE_KVM_IRQFD | |
3019 | case KVM_CAP_IRQFD: | |
3020 | case KVM_CAP_IRQFD_RESAMPLE: | |
3021 | #endif | |
3022 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: | |
3023 | case KVM_CAP_CHECK_EXTENSION_VM: | |
3024 | return 1; | |
3025 | #ifdef CONFIG_KVM_MMIO | |
3026 | case KVM_CAP_COALESCED_MMIO: | |
3027 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
3028 | #endif | |
3029 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
3030 | case KVM_CAP_IRQ_ROUTING: | |
3031 | return KVM_MAX_IRQ_ROUTES; | |
3032 | #endif | |
3033 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
3034 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
3035 | return KVM_ADDRESS_SPACE_NUM; | |
3036 | #endif | |
3037 | default: | |
3038 | break; | |
3039 | } | |
3040 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
3041 | } | |
3042 | ||
3043 | static long kvm_vm_ioctl(struct file *filp, | |
3044 | unsigned int ioctl, unsigned long arg) | |
3045 | { | |
3046 | struct kvm *kvm = filp->private_data; | |
3047 | void __user *argp = (void __user *)arg; | |
3048 | int r; | |
3049 | ||
3050 | if (kvm->mm != current->mm) | |
3051 | return -EIO; | |
3052 | switch (ioctl) { | |
3053 | case KVM_CREATE_VCPU: | |
3054 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
3055 | break; | |
3056 | case KVM_SET_USER_MEMORY_REGION: { | |
3057 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3058 | ||
3059 | r = -EFAULT; | |
3060 | if (copy_from_user(&kvm_userspace_mem, argp, | |
3061 | sizeof(kvm_userspace_mem))) | |
3062 | goto out; | |
3063 | ||
3064 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); | |
3065 | break; | |
3066 | } | |
3067 | case KVM_GET_DIRTY_LOG: { | |
3068 | struct kvm_dirty_log log; | |
3069 | ||
3070 | r = -EFAULT; | |
3071 | if (copy_from_user(&log, argp, sizeof(log))) | |
3072 | goto out; | |
3073 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
3074 | break; | |
3075 | } | |
3076 | #ifdef CONFIG_KVM_MMIO | |
3077 | case KVM_REGISTER_COALESCED_MMIO: { | |
3078 | struct kvm_coalesced_mmio_zone zone; | |
3079 | ||
3080 | r = -EFAULT; | |
3081 | if (copy_from_user(&zone, argp, sizeof(zone))) | |
3082 | goto out; | |
3083 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); | |
3084 | break; | |
3085 | } | |
3086 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3087 | struct kvm_coalesced_mmio_zone zone; | |
3088 | ||
3089 | r = -EFAULT; | |
3090 | if (copy_from_user(&zone, argp, sizeof(zone))) | |
3091 | goto out; | |
3092 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); | |
3093 | break; | |
3094 | } | |
3095 | #endif | |
3096 | case KVM_IRQFD: { | |
3097 | struct kvm_irqfd data; | |
3098 | ||
3099 | r = -EFAULT; | |
3100 | if (copy_from_user(&data, argp, sizeof(data))) | |
3101 | goto out; | |
3102 | r = kvm_irqfd(kvm, &data); | |
3103 | break; | |
3104 | } | |
3105 | case KVM_IOEVENTFD: { | |
3106 | struct kvm_ioeventfd data; | |
3107 | ||
3108 | r = -EFAULT; | |
3109 | if (copy_from_user(&data, argp, sizeof(data))) | |
3110 | goto out; | |
3111 | r = kvm_ioeventfd(kvm, &data); | |
3112 | break; | |
3113 | } | |
3114 | #ifdef CONFIG_HAVE_KVM_MSI | |
3115 | case KVM_SIGNAL_MSI: { | |
3116 | struct kvm_msi msi; | |
3117 | ||
3118 | r = -EFAULT; | |
3119 | if (copy_from_user(&msi, argp, sizeof(msi))) | |
3120 | goto out; | |
3121 | r = kvm_send_userspace_msi(kvm, &msi); | |
3122 | break; | |
3123 | } | |
3124 | #endif | |
3125 | #ifdef __KVM_HAVE_IRQ_LINE | |
3126 | case KVM_IRQ_LINE_STATUS: | |
3127 | case KVM_IRQ_LINE: { | |
3128 | struct kvm_irq_level irq_event; | |
3129 | ||
3130 | r = -EFAULT; | |
3131 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) | |
3132 | goto out; | |
3133 | ||
3134 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, | |
3135 | ioctl == KVM_IRQ_LINE_STATUS); | |
3136 | if (r) | |
3137 | goto out; | |
3138 | ||
3139 | r = -EFAULT; | |
3140 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
3141 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) | |
3142 | goto out; | |
3143 | } | |
3144 | ||
3145 | r = 0; | |
3146 | break; | |
3147 | } | |
3148 | #endif | |
3149 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
3150 | case KVM_SET_GSI_ROUTING: { | |
3151 | struct kvm_irq_routing routing; | |
3152 | struct kvm_irq_routing __user *urouting; | |
3153 | struct kvm_irq_routing_entry *entries = NULL; | |
3154 | ||
3155 | r = -EFAULT; | |
3156 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3157 | goto out; | |
3158 | r = -EINVAL; | |
3159 | if (!kvm_arch_can_set_irq_routing(kvm)) | |
3160 | goto out; | |
3161 | if (routing.nr > KVM_MAX_IRQ_ROUTES) | |
3162 | goto out; | |
3163 | if (routing.flags) | |
3164 | goto out; | |
3165 | if (routing.nr) { | |
3166 | r = -ENOMEM; | |
3167 | entries = vmalloc(routing.nr * sizeof(*entries)); | |
3168 | if (!entries) | |
3169 | goto out; | |
3170 | r = -EFAULT; | |
3171 | urouting = argp; | |
3172 | if (copy_from_user(entries, urouting->entries, | |
3173 | routing.nr * sizeof(*entries))) | |
3174 | goto out_free_irq_routing; | |
3175 | } | |
3176 | r = kvm_set_irq_routing(kvm, entries, routing.nr, | |
3177 | routing.flags); | |
3178 | out_free_irq_routing: | |
3179 | vfree(entries); | |
3180 | break; | |
3181 | } | |
3182 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
3183 | case KVM_CREATE_DEVICE: { | |
3184 | struct kvm_create_device cd; | |
3185 | ||
3186 | r = -EFAULT; | |
3187 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3188 | goto out; | |
3189 | ||
3190 | r = kvm_ioctl_create_device(kvm, &cd); | |
3191 | if (r) | |
3192 | goto out; | |
3193 | ||
3194 | r = -EFAULT; | |
3195 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3196 | goto out; | |
3197 | ||
3198 | r = 0; | |
3199 | break; | |
3200 | } | |
3201 | case KVM_CHECK_EXTENSION: | |
3202 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3203 | break; | |
3204 | default: | |
3205 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); | |
3206 | } | |
3207 | out: | |
3208 | return r; | |
3209 | } | |
3210 | ||
3211 | #ifdef CONFIG_KVM_COMPAT | |
3212 | struct compat_kvm_dirty_log { | |
3213 | __u32 slot; | |
3214 | __u32 padding1; | |
3215 | union { | |
3216 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3217 | __u64 padding2; | |
3218 | }; | |
3219 | }; | |
3220 | ||
3221 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3222 | unsigned int ioctl, unsigned long arg) | |
3223 | { | |
3224 | struct kvm *kvm = filp->private_data; | |
3225 | int r; | |
3226 | ||
3227 | if (kvm->mm != current->mm) | |
3228 | return -EIO; | |
3229 | switch (ioctl) { | |
3230 | case KVM_GET_DIRTY_LOG: { | |
3231 | struct compat_kvm_dirty_log compat_log; | |
3232 | struct kvm_dirty_log log; | |
3233 | ||
3234 | if (copy_from_user(&compat_log, (void __user *)arg, | |
3235 | sizeof(compat_log))) | |
3236 | return -EFAULT; | |
3237 | log.slot = compat_log.slot; | |
3238 | log.padding1 = compat_log.padding1; | |
3239 | log.padding2 = compat_log.padding2; | |
3240 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3241 | ||
3242 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
3243 | break; | |
3244 | } | |
3245 | default: | |
3246 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3247 | } | |
3248 | return r; | |
3249 | } | |
3250 | #endif | |
3251 | ||
3252 | static struct file_operations kvm_vm_fops = { | |
3253 | .release = kvm_vm_release, | |
3254 | .unlocked_ioctl = kvm_vm_ioctl, | |
3255 | #ifdef CONFIG_KVM_COMPAT | |
3256 | .compat_ioctl = kvm_vm_compat_ioctl, | |
3257 | #endif | |
3258 | .llseek = noop_llseek, | |
3259 | }; | |
3260 | ||
3261 | static int kvm_dev_ioctl_create_vm(unsigned long type) | |
3262 | { | |
3263 | int r; | |
3264 | struct kvm *kvm; | |
3265 | struct file *file; | |
3266 | ||
3267 | kvm = kvm_create_vm(type); | |
3268 | if (IS_ERR(kvm)) | |
3269 | return PTR_ERR(kvm); | |
3270 | #ifdef CONFIG_KVM_MMIO | |
3271 | r = kvm_coalesced_mmio_init(kvm); | |
3272 | if (r < 0) { | |
3273 | kvm_put_kvm(kvm); | |
3274 | return r; | |
3275 | } | |
3276 | #endif | |
3277 | r = get_unused_fd_flags(O_CLOEXEC); | |
3278 | if (r < 0) { | |
3279 | kvm_put_kvm(kvm); | |
3280 | return r; | |
3281 | } | |
3282 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); | |
3283 | if (IS_ERR(file)) { | |
3284 | put_unused_fd(r); | |
3285 | kvm_put_kvm(kvm); | |
3286 | return PTR_ERR(file); | |
3287 | } | |
3288 | ||
3289 | /* | |
3290 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3291 | * already set, with ->release() being kvm_vm_release(). In error | |
3292 | * cases it will be called by the final fput(file) and will take | |
3293 | * care of doing kvm_put_kvm(kvm). | |
3294 | */ | |
3295 | if (kvm_create_vm_debugfs(kvm, r) < 0) { | |
3296 | put_unused_fd(r); | |
3297 | fput(file); | |
3298 | return -ENOMEM; | |
3299 | } | |
3300 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); | |
3301 | ||
3302 | fd_install(r, file); | |
3303 | return r; | |
3304 | } | |
3305 | ||
3306 | static long kvm_dev_ioctl(struct file *filp, | |
3307 | unsigned int ioctl, unsigned long arg) | |
3308 | { | |
3309 | long r = -EINVAL; | |
3310 | ||
3311 | switch (ioctl) { | |
3312 | case KVM_GET_API_VERSION: | |
3313 | if (arg) | |
3314 | goto out; | |
3315 | r = KVM_API_VERSION; | |
3316 | break; | |
3317 | case KVM_CREATE_VM: | |
3318 | r = kvm_dev_ioctl_create_vm(arg); | |
3319 | break; | |
3320 | case KVM_CHECK_EXTENSION: | |
3321 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); | |
3322 | break; | |
3323 | case KVM_GET_VCPU_MMAP_SIZE: | |
3324 | if (arg) | |
3325 | goto out; | |
3326 | r = PAGE_SIZE; /* struct kvm_run */ | |
3327 | #ifdef CONFIG_X86 | |
3328 | r += PAGE_SIZE; /* pio data page */ | |
3329 | #endif | |
3330 | #ifdef CONFIG_KVM_MMIO | |
3331 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
3332 | #endif | |
3333 | break; | |
3334 | case KVM_TRACE_ENABLE: | |
3335 | case KVM_TRACE_PAUSE: | |
3336 | case KVM_TRACE_DISABLE: | |
3337 | r = -EOPNOTSUPP; | |
3338 | break; | |
3339 | default: | |
3340 | return kvm_arch_dev_ioctl(filp, ioctl, arg); | |
3341 | } | |
3342 | out: | |
3343 | return r; | |
3344 | } | |
3345 | ||
3346 | static struct file_operations kvm_chardev_ops = { | |
3347 | .unlocked_ioctl = kvm_dev_ioctl, | |
3348 | .compat_ioctl = kvm_dev_ioctl, | |
3349 | .llseek = noop_llseek, | |
3350 | }; | |
3351 | ||
3352 | static struct miscdevice kvm_dev = { | |
3353 | KVM_MINOR, | |
3354 | "kvm", | |
3355 | &kvm_chardev_ops, | |
3356 | }; | |
3357 | ||
3358 | static void hardware_enable_nolock(void *junk) | |
3359 | { | |
3360 | int cpu = raw_smp_processor_id(); | |
3361 | int r; | |
3362 | ||
3363 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) | |
3364 | return; | |
3365 | ||
3366 | cpumask_set_cpu(cpu, cpus_hardware_enabled); | |
3367 | ||
3368 | r = kvm_arch_hardware_enable(); | |
3369 | ||
3370 | if (r) { | |
3371 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3372 | atomic_inc(&hardware_enable_failed); | |
3373 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); | |
3374 | } | |
3375 | } | |
3376 | ||
3377 | static int kvm_starting_cpu(unsigned int cpu) | |
3378 | { | |
3379 | raw_spin_lock(&kvm_count_lock); | |
3380 | if (kvm_usage_count) | |
3381 | hardware_enable_nolock(NULL); | |
3382 | raw_spin_unlock(&kvm_count_lock); | |
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | static void hardware_disable_nolock(void *junk) | |
3387 | { | |
3388 | int cpu = raw_smp_processor_id(); | |
3389 | ||
3390 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) | |
3391 | return; | |
3392 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3393 | kvm_arch_hardware_disable(); | |
3394 | } | |
3395 | ||
3396 | static int kvm_dying_cpu(unsigned int cpu) | |
3397 | { | |
3398 | raw_spin_lock(&kvm_count_lock); | |
3399 | if (kvm_usage_count) | |
3400 | hardware_disable_nolock(NULL); | |
3401 | raw_spin_unlock(&kvm_count_lock); | |
3402 | return 0; | |
3403 | } | |
3404 | ||
3405 | static void hardware_disable_all_nolock(void) | |
3406 | { | |
3407 | BUG_ON(!kvm_usage_count); | |
3408 | ||
3409 | kvm_usage_count--; | |
3410 | if (!kvm_usage_count) | |
3411 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
3412 | } | |
3413 | ||
3414 | static void hardware_disable_all(void) | |
3415 | { | |
3416 | raw_spin_lock(&kvm_count_lock); | |
3417 | hardware_disable_all_nolock(); | |
3418 | raw_spin_unlock(&kvm_count_lock); | |
3419 | } | |
3420 | ||
3421 | static int hardware_enable_all(void) | |
3422 | { | |
3423 | int r = 0; | |
3424 | ||
3425 | raw_spin_lock(&kvm_count_lock); | |
3426 | ||
3427 | kvm_usage_count++; | |
3428 | if (kvm_usage_count == 1) { | |
3429 | atomic_set(&hardware_enable_failed, 0); | |
3430 | on_each_cpu(hardware_enable_nolock, NULL, 1); | |
3431 | ||
3432 | if (atomic_read(&hardware_enable_failed)) { | |
3433 | hardware_disable_all_nolock(); | |
3434 | r = -EBUSY; | |
3435 | } | |
3436 | } | |
3437 | ||
3438 | raw_spin_unlock(&kvm_count_lock); | |
3439 | ||
3440 | return r; | |
3441 | } | |
3442 | ||
3443 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, | |
3444 | void *v) | |
3445 | { | |
3446 | /* | |
3447 | * Some (well, at least mine) BIOSes hang on reboot if | |
3448 | * in vmx root mode. | |
3449 | * | |
3450 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3451 | */ | |
3452 | pr_info("kvm: exiting hardware virtualization\n"); | |
3453 | kvm_rebooting = true; | |
3454 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
3455 | return NOTIFY_OK; | |
3456 | } | |
3457 | ||
3458 | static struct notifier_block kvm_reboot_notifier = { | |
3459 | .notifier_call = kvm_reboot, | |
3460 | .priority = 0, | |
3461 | }; | |
3462 | ||
3463 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) | |
3464 | { | |
3465 | int i; | |
3466 | ||
3467 | for (i = 0; i < bus->dev_count; i++) { | |
3468 | struct kvm_io_device *pos = bus->range[i].dev; | |
3469 | ||
3470 | kvm_iodevice_destructor(pos); | |
3471 | } | |
3472 | kfree(bus); | |
3473 | } | |
3474 | ||
3475 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, | |
3476 | const struct kvm_io_range *r2) | |
3477 | { | |
3478 | gpa_t addr1 = r1->addr; | |
3479 | gpa_t addr2 = r2->addr; | |
3480 | ||
3481 | if (addr1 < addr2) | |
3482 | return -1; | |
3483 | ||
3484 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3485 | * accept any overlapping write. Any order is acceptable for | |
3486 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3487 | * we process all of them. | |
3488 | */ | |
3489 | if (r2->len) { | |
3490 | addr1 += r1->len; | |
3491 | addr2 += r2->len; | |
3492 | } | |
3493 | ||
3494 | if (addr1 > addr2) | |
3495 | return 1; | |
3496 | ||
3497 | return 0; | |
3498 | } | |
3499 | ||
3500 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) | |
3501 | { | |
3502 | return kvm_io_bus_cmp(p1, p2); | |
3503 | } | |
3504 | ||
3505 | static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, | |
3506 | gpa_t addr, int len) | |
3507 | { | |
3508 | bus->range[bus->dev_count++] = (struct kvm_io_range) { | |
3509 | .addr = addr, | |
3510 | .len = len, | |
3511 | .dev = dev, | |
3512 | }; | |
3513 | ||
3514 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
3515 | kvm_io_bus_sort_cmp, NULL); | |
3516 | ||
3517 | return 0; | |
3518 | } | |
3519 | ||
3520 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, | |
3521 | gpa_t addr, int len) | |
3522 | { | |
3523 | struct kvm_io_range *range, key; | |
3524 | int off; | |
3525 | ||
3526 | key = (struct kvm_io_range) { | |
3527 | .addr = addr, | |
3528 | .len = len, | |
3529 | }; | |
3530 | ||
3531 | range = bsearch(&key, bus->range, bus->dev_count, | |
3532 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3533 | if (range == NULL) | |
3534 | return -ENOENT; | |
3535 | ||
3536 | off = range - bus->range; | |
3537 | ||
3538 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) | |
3539 | off--; | |
3540 | ||
3541 | return off; | |
3542 | } | |
3543 | ||
3544 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, | |
3545 | struct kvm_io_range *range, const void *val) | |
3546 | { | |
3547 | int idx; | |
3548 | ||
3549 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3550 | if (idx < 0) | |
3551 | return -EOPNOTSUPP; | |
3552 | ||
3553 | while (idx < bus->dev_count && | |
3554 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { | |
3555 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, | |
3556 | range->len, val)) | |
3557 | return idx; | |
3558 | idx++; | |
3559 | } | |
3560 | ||
3561 | return -EOPNOTSUPP; | |
3562 | } | |
3563 | ||
3564 | /* kvm_io_bus_write - called under kvm->slots_lock */ | |
3565 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, | |
3566 | int len, const void *val) | |
3567 | { | |
3568 | struct kvm_io_bus *bus; | |
3569 | struct kvm_io_range range; | |
3570 | int r; | |
3571 | ||
3572 | range = (struct kvm_io_range) { | |
3573 | .addr = addr, | |
3574 | .len = len, | |
3575 | }; | |
3576 | ||
3577 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3578 | if (!bus) | |
3579 | return -ENOMEM; | |
3580 | r = __kvm_io_bus_write(vcpu, bus, &range, val); | |
3581 | return r < 0 ? r : 0; | |
3582 | } | |
3583 | ||
3584 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
3585 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, | |
3586 | gpa_t addr, int len, const void *val, long cookie) | |
3587 | { | |
3588 | struct kvm_io_bus *bus; | |
3589 | struct kvm_io_range range; | |
3590 | ||
3591 | range = (struct kvm_io_range) { | |
3592 | .addr = addr, | |
3593 | .len = len, | |
3594 | }; | |
3595 | ||
3596 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3597 | if (!bus) | |
3598 | return -ENOMEM; | |
3599 | ||
3600 | /* First try the device referenced by cookie. */ | |
3601 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
3602 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) | |
3603 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, | |
3604 | val)) | |
3605 | return cookie; | |
3606 | ||
3607 | /* | |
3608 | * cookie contained garbage; fall back to search and return the | |
3609 | * correct cookie value. | |
3610 | */ | |
3611 | return __kvm_io_bus_write(vcpu, bus, &range, val); | |
3612 | } | |
3613 | ||
3614 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, | |
3615 | struct kvm_io_range *range, void *val) | |
3616 | { | |
3617 | int idx; | |
3618 | ||
3619 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3620 | if (idx < 0) | |
3621 | return -EOPNOTSUPP; | |
3622 | ||
3623 | while (idx < bus->dev_count && | |
3624 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { | |
3625 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, | |
3626 | range->len, val)) | |
3627 | return idx; | |
3628 | idx++; | |
3629 | } | |
3630 | ||
3631 | return -EOPNOTSUPP; | |
3632 | } | |
3633 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); | |
3634 | ||
3635 | /* kvm_io_bus_read - called under kvm->slots_lock */ | |
3636 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, | |
3637 | int len, void *val) | |
3638 | { | |
3639 | struct kvm_io_bus *bus; | |
3640 | struct kvm_io_range range; | |
3641 | int r; | |
3642 | ||
3643 | range = (struct kvm_io_range) { | |
3644 | .addr = addr, | |
3645 | .len = len, | |
3646 | }; | |
3647 | ||
3648 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); | |
3649 | if (!bus) | |
3650 | return -ENOMEM; | |
3651 | r = __kvm_io_bus_read(vcpu, bus, &range, val); | |
3652 | return r < 0 ? r : 0; | |
3653 | } | |
3654 | ||
3655 | ||
3656 | /* Caller must hold slots_lock. */ | |
3657 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, | |
3658 | int len, struct kvm_io_device *dev) | |
3659 | { | |
3660 | struct kvm_io_bus *new_bus, *bus; | |
3661 | ||
3662 | bus = kvm_get_bus(kvm, bus_idx); | |
3663 | if (!bus) | |
3664 | return -ENOMEM; | |
3665 | ||
3666 | /* exclude ioeventfd which is limited by maximum fd */ | |
3667 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
3668 | return -ENOSPC; | |
3669 | ||
3670 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) * | |
3671 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3672 | if (!new_bus) | |
3673 | return -ENOMEM; | |
3674 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * | |
3675 | sizeof(struct kvm_io_range))); | |
3676 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); | |
3677 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3678 | synchronize_srcu_expedited(&kvm->srcu); | |
3679 | kfree(bus); | |
3680 | ||
3681 | return 0; | |
3682 | } | |
3683 | ||
3684 | /* Caller must hold slots_lock. */ | |
3685 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, | |
3686 | struct kvm_io_device *dev) | |
3687 | { | |
3688 | int i; | |
3689 | struct kvm_io_bus *new_bus, *bus; | |
3690 | ||
3691 | bus = kvm_get_bus(kvm, bus_idx); | |
3692 | if (!bus) | |
3693 | return; | |
3694 | ||
3695 | for (i = 0; i < bus->dev_count; i++) | |
3696 | if (bus->range[i].dev == dev) { | |
3697 | break; | |
3698 | } | |
3699 | ||
3700 | if (i == bus->dev_count) | |
3701 | return; | |
3702 | ||
3703 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
3704 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3705 | if (!new_bus) { | |
3706 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
3707 | goto broken; | |
3708 | } | |
3709 | ||
3710 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3711 | new_bus->dev_count--; | |
3712 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3713 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
3714 | ||
3715 | broken: | |
3716 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3717 | synchronize_srcu_expedited(&kvm->srcu); | |
3718 | kfree(bus); | |
3719 | return; | |
3720 | } | |
3721 | ||
3722 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, | |
3723 | gpa_t addr) | |
3724 | { | |
3725 | struct kvm_io_bus *bus; | |
3726 | int dev_idx, srcu_idx; | |
3727 | struct kvm_io_device *iodev = NULL; | |
3728 | ||
3729 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3730 | ||
3731 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
3732 | if (!bus) | |
3733 | goto out_unlock; | |
3734 | ||
3735 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3736 | if (dev_idx < 0) | |
3737 | goto out_unlock; | |
3738 | ||
3739 | iodev = bus->range[dev_idx].dev; | |
3740 | ||
3741 | out_unlock: | |
3742 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3743 | ||
3744 | return iodev; | |
3745 | } | |
3746 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
3747 | ||
3748 | static int kvm_debugfs_open(struct inode *inode, struct file *file, | |
3749 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
3750 | const char *fmt) | |
3751 | { | |
3752 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3753 | inode->i_private; | |
3754 | ||
3755 | /* The debugfs files are a reference to the kvm struct which | |
3756 | * is still valid when kvm_destroy_vm is called. | |
3757 | * To avoid the race between open and the removal of the debugfs | |
3758 | * directory we test against the users count. | |
3759 | */ | |
3760 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) | |
3761 | return -ENOENT; | |
3762 | ||
3763 | if (simple_attr_open(inode, file, get, | |
3764 | stat_data->mode & S_IWUGO ? set : NULL, | |
3765 | fmt)) { | |
3766 | kvm_put_kvm(stat_data->kvm); | |
3767 | return -ENOMEM; | |
3768 | } | |
3769 | ||
3770 | return 0; | |
3771 | } | |
3772 | ||
3773 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
3774 | { | |
3775 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3776 | inode->i_private; | |
3777 | ||
3778 | simple_attr_release(inode, file); | |
3779 | kvm_put_kvm(stat_data->kvm); | |
3780 | ||
3781 | return 0; | |
3782 | } | |
3783 | ||
3784 | static int vm_stat_get_per_vm(void *data, u64 *val) | |
3785 | { | |
3786 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3787 | ||
3788 | *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset); | |
3789 | ||
3790 | return 0; | |
3791 | } | |
3792 | ||
3793 | static int vm_stat_clear_per_vm(void *data, u64 val) | |
3794 | { | |
3795 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3796 | ||
3797 | if (val) | |
3798 | return -EINVAL; | |
3799 | ||
3800 | *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0; | |
3801 | ||
3802 | return 0; | |
3803 | } | |
3804 | ||
3805 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) | |
3806 | { | |
3807 | __simple_attr_check_format("%llu\n", 0ull); | |
3808 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, | |
3809 | vm_stat_clear_per_vm, "%llu\n"); | |
3810 | } | |
3811 | ||
3812 | static const struct file_operations vm_stat_get_per_vm_fops = { | |
3813 | .owner = THIS_MODULE, | |
3814 | .open = vm_stat_get_per_vm_open, | |
3815 | .release = kvm_debugfs_release, | |
3816 | .read = simple_attr_read, | |
3817 | .write = simple_attr_write, | |
3818 | .llseek = no_llseek, | |
3819 | }; | |
3820 | ||
3821 | static int vcpu_stat_get_per_vm(void *data, u64 *val) | |
3822 | { | |
3823 | int i; | |
3824 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3825 | struct kvm_vcpu *vcpu; | |
3826 | ||
3827 | *val = 0; | |
3828 | ||
3829 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3830 | *val += *(u64 *)((void *)vcpu + stat_data->offset); | |
3831 | ||
3832 | return 0; | |
3833 | } | |
3834 | ||
3835 | static int vcpu_stat_clear_per_vm(void *data, u64 val) | |
3836 | { | |
3837 | int i; | |
3838 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3839 | struct kvm_vcpu *vcpu; | |
3840 | ||
3841 | if (val) | |
3842 | return -EINVAL; | |
3843 | ||
3844 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3845 | *(u64 *)((void *)vcpu + stat_data->offset) = 0; | |
3846 | ||
3847 | return 0; | |
3848 | } | |
3849 | ||
3850 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) | |
3851 | { | |
3852 | __simple_attr_check_format("%llu\n", 0ull); | |
3853 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, | |
3854 | vcpu_stat_clear_per_vm, "%llu\n"); | |
3855 | } | |
3856 | ||
3857 | static const struct file_operations vcpu_stat_get_per_vm_fops = { | |
3858 | .owner = THIS_MODULE, | |
3859 | .open = vcpu_stat_get_per_vm_open, | |
3860 | .release = kvm_debugfs_release, | |
3861 | .read = simple_attr_read, | |
3862 | .write = simple_attr_write, | |
3863 | .llseek = no_llseek, | |
3864 | }; | |
3865 | ||
3866 | static const struct file_operations *stat_fops_per_vm[] = { | |
3867 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, | |
3868 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, | |
3869 | }; | |
3870 | ||
3871 | static int vm_stat_get(void *_offset, u64 *val) | |
3872 | { | |
3873 | unsigned offset = (long)_offset; | |
3874 | struct kvm *kvm; | |
3875 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3876 | u64 tmp_val; | |
3877 | ||
3878 | *val = 0; | |
3879 | mutex_lock(&kvm_lock); | |
3880 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3881 | stat_tmp.kvm = kvm; | |
3882 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3883 | *val += tmp_val; | |
3884 | } | |
3885 | mutex_unlock(&kvm_lock); | |
3886 | return 0; | |
3887 | } | |
3888 | ||
3889 | static int vm_stat_clear(void *_offset, u64 val) | |
3890 | { | |
3891 | unsigned offset = (long)_offset; | |
3892 | struct kvm *kvm; | |
3893 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3894 | ||
3895 | if (val) | |
3896 | return -EINVAL; | |
3897 | ||
3898 | mutex_lock(&kvm_lock); | |
3899 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3900 | stat_tmp.kvm = kvm; | |
3901 | vm_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3902 | } | |
3903 | mutex_unlock(&kvm_lock); | |
3904 | ||
3905 | return 0; | |
3906 | } | |
3907 | ||
3908 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
3909 | ||
3910 | static int vcpu_stat_get(void *_offset, u64 *val) | |
3911 | { | |
3912 | unsigned offset = (long)_offset; | |
3913 | struct kvm *kvm; | |
3914 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3915 | u64 tmp_val; | |
3916 | ||
3917 | *val = 0; | |
3918 | mutex_lock(&kvm_lock); | |
3919 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3920 | stat_tmp.kvm = kvm; | |
3921 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3922 | *val += tmp_val; | |
3923 | } | |
3924 | mutex_unlock(&kvm_lock); | |
3925 | return 0; | |
3926 | } | |
3927 | ||
3928 | static int vcpu_stat_clear(void *_offset, u64 val) | |
3929 | { | |
3930 | unsigned offset = (long)_offset; | |
3931 | struct kvm *kvm; | |
3932 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3933 | ||
3934 | if (val) | |
3935 | return -EINVAL; | |
3936 | ||
3937 | mutex_lock(&kvm_lock); | |
3938 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3939 | stat_tmp.kvm = kvm; | |
3940 | vcpu_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3941 | } | |
3942 | mutex_unlock(&kvm_lock); | |
3943 | ||
3944 | return 0; | |
3945 | } | |
3946 | ||
3947 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
3948 | "%llu\n"); | |
3949 | ||
3950 | static const struct file_operations *stat_fops[] = { | |
3951 | [KVM_STAT_VCPU] = &vcpu_stat_fops, | |
3952 | [KVM_STAT_VM] = &vm_stat_fops, | |
3953 | }; | |
3954 | ||
3955 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) | |
3956 | { | |
3957 | struct kobj_uevent_env *env; | |
3958 | unsigned long long created, active; | |
3959 | ||
3960 | if (!kvm_dev.this_device || !kvm) | |
3961 | return; | |
3962 | ||
3963 | mutex_lock(&kvm_lock); | |
3964 | if (type == KVM_EVENT_CREATE_VM) { | |
3965 | kvm_createvm_count++; | |
3966 | kvm_active_vms++; | |
3967 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
3968 | kvm_active_vms--; | |
3969 | } | |
3970 | created = kvm_createvm_count; | |
3971 | active = kvm_active_vms; | |
3972 | mutex_unlock(&kvm_lock); | |
3973 | ||
3974 | env = kzalloc(sizeof(*env), GFP_KERNEL); | |
3975 | if (!env) | |
3976 | return; | |
3977 | ||
3978 | add_uevent_var(env, "CREATED=%llu", created); | |
3979 | add_uevent_var(env, "COUNT=%llu", active); | |
3980 | ||
3981 | if (type == KVM_EVENT_CREATE_VM) { | |
3982 | add_uevent_var(env, "EVENT=create"); | |
3983 | kvm->userspace_pid = task_pid_nr(current); | |
3984 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
3985 | add_uevent_var(env, "EVENT=destroy"); | |
3986 | } | |
3987 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
3988 | ||
3989 | if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) { | |
3990 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL); | |
3991 | ||
3992 | if (p) { | |
3993 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
3994 | if (!IS_ERR(tmp)) | |
3995 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
3996 | kfree(p); | |
3997 | } | |
3998 | } | |
3999 | /* no need for checks, since we are adding at most only 5 keys */ | |
4000 | env->envp[env->envp_idx++] = NULL; | |
4001 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
4002 | kfree(env); | |
4003 | } | |
4004 | ||
4005 | static int kvm_init_debug(void) | |
4006 | { | |
4007 | int r = -EEXIST; | |
4008 | struct kvm_stats_debugfs_item *p; | |
4009 | ||
4010 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); | |
4011 | if (kvm_debugfs_dir == NULL) | |
4012 | goto out; | |
4013 | ||
4014 | kvm_debugfs_num_entries = 0; | |
4015 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
4016 | int mode = p->mode ? p->mode : 0644; | |
4017 | if (!debugfs_create_file(p->name, mode, kvm_debugfs_dir, | |
4018 | (void *)(long)p->offset, | |
4019 | stat_fops[p->kind])) | |
4020 | goto out_dir; | |
4021 | } | |
4022 | ||
4023 | return 0; | |
4024 | ||
4025 | out_dir: | |
4026 | debugfs_remove_recursive(kvm_debugfs_dir); | |
4027 | out: | |
4028 | return r; | |
4029 | } | |
4030 | ||
4031 | static int kvm_suspend(void) | |
4032 | { | |
4033 | if (kvm_usage_count) | |
4034 | hardware_disable_nolock(NULL); | |
4035 | return 0; | |
4036 | } | |
4037 | ||
4038 | static void kvm_resume(void) | |
4039 | { | |
4040 | if (kvm_usage_count) { | |
4041 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); | |
4042 | hardware_enable_nolock(NULL); | |
4043 | } | |
4044 | } | |
4045 | ||
4046 | static struct syscore_ops kvm_syscore_ops = { | |
4047 | .suspend = kvm_suspend, | |
4048 | .resume = kvm_resume, | |
4049 | }; | |
4050 | ||
4051 | static inline | |
4052 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
4053 | { | |
4054 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
4055 | } | |
4056 | ||
4057 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
4058 | { | |
4059 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4060 | ||
4061 | if (vcpu->preempted) | |
4062 | vcpu->preempted = false; | |
4063 | ||
4064 | kvm_arch_sched_in(vcpu, cpu); | |
4065 | ||
4066 | kvm_arch_vcpu_load(vcpu, cpu); | |
4067 | } | |
4068 | ||
4069 | static void kvm_sched_out(struct preempt_notifier *pn, | |
4070 | struct task_struct *next) | |
4071 | { | |
4072 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4073 | ||
4074 | if (current->state == TASK_RUNNING) | |
4075 | vcpu->preempted = true; | |
4076 | kvm_arch_vcpu_put(vcpu); | |
4077 | } | |
4078 | ||
4079 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, | |
4080 | struct module *module) | |
4081 | { | |
4082 | int r; | |
4083 | int cpu; | |
4084 | ||
4085 | r = kvm_arch_init(opaque); | |
4086 | if (r) | |
4087 | goto out_fail; | |
4088 | ||
4089 | /* | |
4090 | * kvm_arch_init makes sure there's at most one caller | |
4091 | * for architectures that support multiple implementations, | |
4092 | * like intel and amd on x86. | |
4093 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating | |
4094 | * conflicts in case kvm is already setup for another implementation. | |
4095 | */ | |
4096 | r = kvm_irqfd_init(); | |
4097 | if (r) | |
4098 | goto out_irqfd; | |
4099 | ||
4100 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { | |
4101 | r = -ENOMEM; | |
4102 | goto out_free_0; | |
4103 | } | |
4104 | ||
4105 | r = kvm_arch_hardware_setup(); | |
4106 | if (r < 0) | |
4107 | goto out_free_0a; | |
4108 | ||
4109 | for_each_online_cpu(cpu) { | |
4110 | smp_call_function_single(cpu, | |
4111 | kvm_arch_check_processor_compat, | |
4112 | &r, 1); | |
4113 | if (r < 0) | |
4114 | goto out_free_1; | |
4115 | } | |
4116 | ||
4117 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", | |
4118 | kvm_starting_cpu, kvm_dying_cpu); | |
4119 | if (r) | |
4120 | goto out_free_2; | |
4121 | register_reboot_notifier(&kvm_reboot_notifier); | |
4122 | ||
4123 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ | |
4124 | if (!vcpu_align) | |
4125 | vcpu_align = __alignof__(struct kvm_vcpu); | |
4126 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
4127 | SLAB_ACCOUNT, NULL); | |
4128 | if (!kvm_vcpu_cache) { | |
4129 | r = -ENOMEM; | |
4130 | goto out_free_3; | |
4131 | } | |
4132 | ||
4133 | r = kvm_async_pf_init(); | |
4134 | if (r) | |
4135 | goto out_free; | |
4136 | ||
4137 | kvm_chardev_ops.owner = module; | |
4138 | kvm_vm_fops.owner = module; | |
4139 | kvm_vcpu_fops.owner = module; | |
4140 | ||
4141 | r = misc_register(&kvm_dev); | |
4142 | if (r) { | |
4143 | pr_err("kvm: misc device register failed\n"); | |
4144 | goto out_unreg; | |
4145 | } | |
4146 | ||
4147 | register_syscore_ops(&kvm_syscore_ops); | |
4148 | ||
4149 | kvm_preempt_ops.sched_in = kvm_sched_in; | |
4150 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4151 | ||
4152 | r = kvm_init_debug(); | |
4153 | if (r) { | |
4154 | pr_err("kvm: create debugfs files failed\n"); | |
4155 | goto out_undebugfs; | |
4156 | } | |
4157 | ||
4158 | r = kvm_vfio_ops_init(); | |
4159 | WARN_ON(r); | |
4160 | ||
4161 | return 0; | |
4162 | ||
4163 | out_undebugfs: | |
4164 | unregister_syscore_ops(&kvm_syscore_ops); | |
4165 | misc_deregister(&kvm_dev); | |
4166 | out_unreg: | |
4167 | kvm_async_pf_deinit(); | |
4168 | out_free: | |
4169 | kmem_cache_destroy(kvm_vcpu_cache); | |
4170 | out_free_3: | |
4171 | unregister_reboot_notifier(&kvm_reboot_notifier); | |
4172 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); | |
4173 | out_free_2: | |
4174 | out_free_1: | |
4175 | kvm_arch_hardware_unsetup(); | |
4176 | out_free_0a: | |
4177 | free_cpumask_var(cpus_hardware_enabled); | |
4178 | out_free_0: | |
4179 | kvm_irqfd_exit(); | |
4180 | out_irqfd: | |
4181 | kvm_arch_exit(); | |
4182 | out_fail: | |
4183 | return r; | |
4184 | } | |
4185 | EXPORT_SYMBOL_GPL(kvm_init); | |
4186 | ||
4187 | void kvm_exit(void) | |
4188 | { | |
4189 | debugfs_remove_recursive(kvm_debugfs_dir); | |
4190 | misc_deregister(&kvm_dev); | |
4191 | kmem_cache_destroy(kvm_vcpu_cache); | |
4192 | kvm_async_pf_deinit(); | |
4193 | unregister_syscore_ops(&kvm_syscore_ops); | |
4194 | unregister_reboot_notifier(&kvm_reboot_notifier); | |
4195 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); | |
4196 | on_each_cpu(hardware_disable_nolock, NULL, 1); | |
4197 | kvm_arch_hardware_unsetup(); | |
4198 | kvm_arch_exit(); | |
4199 | kvm_irqfd_exit(); | |
4200 | free_cpumask_var(cpus_hardware_enabled); | |
4201 | kvm_vfio_ops_exit(); | |
4202 | } | |
4203 | EXPORT_SYMBOL_GPL(kvm_exit); | |
4204 | ||
4205 | struct kvm_vm_worker_thread_context { | |
4206 | struct kvm *kvm; | |
4207 | struct task_struct *parent; | |
4208 | struct completion init_done; | |
4209 | kvm_vm_thread_fn_t thread_fn; | |
4210 | uintptr_t data; | |
4211 | int err; | |
4212 | }; | |
4213 | ||
4214 | static int kvm_vm_worker_thread(void *context) | |
4215 | { | |
4216 | /* | |
4217 | * The init_context is allocated on the stack of the parent thread, so | |
4218 | * we have to locally copy anything that is needed beyond initialization | |
4219 | */ | |
4220 | struct kvm_vm_worker_thread_context *init_context = context; | |
4221 | struct kvm *kvm = init_context->kvm; | |
4222 | kvm_vm_thread_fn_t thread_fn = init_context->thread_fn; | |
4223 | uintptr_t data = init_context->data; | |
4224 | int err; | |
4225 | ||
4226 | err = kthread_park(current); | |
4227 | /* kthread_park(current) is never supposed to return an error */ | |
4228 | WARN_ON(err != 0); | |
4229 | if (err) | |
4230 | goto init_complete; | |
4231 | ||
4232 | err = cgroup_attach_task_all(init_context->parent, current); | |
4233 | if (err) { | |
4234 | kvm_err("%s: cgroup_attach_task_all failed with err %d\n", | |
4235 | __func__, err); | |
4236 | goto init_complete; | |
4237 | } | |
4238 | ||
4239 | set_user_nice(current, task_nice(init_context->parent)); | |
4240 | ||
4241 | init_complete: | |
4242 | init_context->err = err; | |
4243 | complete(&init_context->init_done); | |
4244 | init_context = NULL; | |
4245 | ||
4246 | if (err) | |
4247 | return err; | |
4248 | ||
4249 | /* Wait to be woken up by the spawner before proceeding. */ | |
4250 | kthread_parkme(); | |
4251 | ||
4252 | if (!kthread_should_stop()) | |
4253 | err = thread_fn(kvm, data); | |
4254 | ||
4255 | return err; | |
4256 | } | |
4257 | ||
4258 | int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn, | |
4259 | uintptr_t data, const char *name, | |
4260 | struct task_struct **thread_ptr) | |
4261 | { | |
4262 | struct kvm_vm_worker_thread_context init_context = {}; | |
4263 | struct task_struct *thread; | |
4264 | ||
4265 | *thread_ptr = NULL; | |
4266 | init_context.kvm = kvm; | |
4267 | init_context.parent = current; | |
4268 | init_context.thread_fn = thread_fn; | |
4269 | init_context.data = data; | |
4270 | init_completion(&init_context.init_done); | |
4271 | ||
4272 | thread = kthread_run(kvm_vm_worker_thread, &init_context, | |
4273 | "%s-%d", name, task_pid_nr(current)); | |
4274 | if (IS_ERR(thread)) | |
4275 | return PTR_ERR(thread); | |
4276 | ||
4277 | /* kthread_run is never supposed to return NULL */ | |
4278 | WARN_ON(thread == NULL); | |
4279 | ||
4280 | wait_for_completion(&init_context.init_done); | |
4281 | ||
4282 | if (!init_context.err) | |
4283 | *thread_ptr = thread; | |
4284 | ||
4285 | return init_context.err; | |
4286 | } |