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Commit | Line | Data |
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6aa8b732 AK |
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. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
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 | ||
af669ac6 | 19 | #include <kvm/iodev.h> |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
743eeb0b SL |
50 | #include <linux/sort.h> |
51 | #include <linux/bsearch.h> | |
6aa8b732 | 52 | |
e495606d | 53 | #include <asm/processor.h> |
e495606d | 54 | #include <asm/io.h> |
2ea75be3 | 55 | #include <asm/ioctl.h> |
e495606d | 56 | #include <asm/uaccess.h> |
3e021bf5 | 57 | #include <asm/pgtable.h> |
6aa8b732 | 58 | |
5f94c174 | 59 | #include "coalesced_mmio.h" |
af585b92 | 60 | #include "async_pf.h" |
3c3c29fd | 61 | #include "vfio.h" |
5f94c174 | 62 | |
229456fc MT |
63 | #define CREATE_TRACE_POINTS |
64 | #include <trace/events/kvm.h> | |
65 | ||
6aa8b732 AK |
66 | MODULE_AUTHOR("Qumranet"); |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
920552b2 DH |
69 | /* Architectures should define their poll value according to the halt latency */ |
70 | static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; | |
f7819512 PB |
71 | module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR); |
72 | ||
aca6ff29 WL |
73 | /* Default doubles per-vcpu halt_poll_ns. */ |
74 | static unsigned int halt_poll_ns_grow = 2; | |
75 | module_param(halt_poll_ns_grow, int, S_IRUGO); | |
76 | ||
77 | /* Default resets per-vcpu halt_poll_ns . */ | |
78 | static unsigned int halt_poll_ns_shrink; | |
79 | module_param(halt_poll_ns_shrink, int, S_IRUGO); | |
80 | ||
fa40a821 MT |
81 | /* |
82 | * Ordering of locks: | |
83 | * | |
b7d409de | 84 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
85 | */ |
86 | ||
2f303b74 | 87 | DEFINE_SPINLOCK(kvm_lock); |
4a937f96 | 88 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 89 | LIST_HEAD(vm_list); |
133de902 | 90 | |
7f59f492 | 91 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 92 | static int kvm_usage_count; |
10474ae8 | 93 | static atomic_t hardware_enable_failed; |
1b6c0168 | 94 | |
c16f862d RR |
95 | struct kmem_cache *kvm_vcpu_cache; |
96 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 97 | |
15ad7146 AK |
98 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
99 | ||
76f7c879 | 100 | struct dentry *kvm_debugfs_dir; |
e23a808b | 101 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 102 | |
bccf2150 AK |
103 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
104 | unsigned long arg); | |
de8e5d74 | 105 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
106 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
107 | unsigned long arg); | |
108 | #endif | |
10474ae8 AG |
109 | static int hardware_enable_all(void); |
110 | static void hardware_disable_all(void); | |
bccf2150 | 111 | |
e93f8a0f | 112 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e SH |
113 | |
114 | static void kvm_release_pfn_dirty(pfn_t pfn); | |
bc009e43 | 115 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 116 | |
52480137 | 117 | __visible bool kvm_rebooting; |
b7c4145b | 118 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 119 | |
54dee993 MT |
120 | static bool largepages_enabled = true; |
121 | ||
bf4bea8e | 122 | bool kvm_is_reserved_pfn(pfn_t pfn) |
cbff90a7 | 123 | { |
11feeb49 | 124 | if (pfn_valid(pfn)) |
bf4bea8e | 125 | return PageReserved(pfn_to_page(pfn)); |
cbff90a7 BAY |
126 | |
127 | return true; | |
128 | } | |
129 | ||
bccf2150 AK |
130 | /* |
131 | * Switches to specified vcpu, until a matching vcpu_put() | |
132 | */ | |
9fc77441 | 133 | int vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 134 | { |
15ad7146 AK |
135 | int cpu; |
136 | ||
9fc77441 MT |
137 | if (mutex_lock_killable(&vcpu->mutex)) |
138 | return -EINTR; | |
15ad7146 AK |
139 | cpu = get_cpu(); |
140 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 141 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 142 | put_cpu(); |
9fc77441 | 143 | return 0; |
6aa8b732 AK |
144 | } |
145 | ||
313a3dc7 | 146 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 147 | { |
15ad7146 | 148 | preempt_disable(); |
313a3dc7 | 149 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
150 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
151 | preempt_enable(); | |
6aa8b732 AK |
152 | mutex_unlock(&vcpu->mutex); |
153 | } | |
154 | ||
d9e368d6 AK |
155 | static void ack_flush(void *_completed) |
156 | { | |
d9e368d6 AK |
157 | } |
158 | ||
445b8236 | 159 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 160 | { |
597a5f55 | 161 | int i, cpu, me; |
6ef7a1bc RR |
162 | cpumask_var_t cpus; |
163 | bool called = true; | |
d9e368d6 | 164 | struct kvm_vcpu *vcpu; |
d9e368d6 | 165 | |
79f55997 | 166 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 167 | |
3cba4130 | 168 | me = get_cpu(); |
988a2cae | 169 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 170 | kvm_make_request(req, vcpu); |
d9e368d6 | 171 | cpu = vcpu->cpu; |
6b7e2d09 XG |
172 | |
173 | /* Set ->requests bit before we read ->mode */ | |
174 | smp_mb(); | |
175 | ||
176 | if (cpus != NULL && cpu != -1 && cpu != me && | |
177 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 178 | cpumask_set_cpu(cpu, cpus); |
49846896 | 179 | } |
6ef7a1bc RR |
180 | if (unlikely(cpus == NULL)) |
181 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
182 | else if (!cpumask_empty(cpus)) | |
183 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
184 | else | |
185 | called = false; | |
3cba4130 | 186 | put_cpu(); |
6ef7a1bc | 187 | free_cpumask_var(cpus); |
49846896 | 188 | return called; |
d9e368d6 AK |
189 | } |
190 | ||
a6d51016 | 191 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 192 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 193 | { |
a086f6a1 XG |
194 | long dirty_count = kvm->tlbs_dirty; |
195 | ||
196 | smp_mb(); | |
445b8236 | 197 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
49846896 | 198 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 199 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 200 | } |
2ba9f0d8 | 201 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 202 | #endif |
2e53d63a | 203 | |
49846896 RR |
204 | void kvm_reload_remote_mmus(struct kvm *kvm) |
205 | { | |
445b8236 | 206 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 207 | } |
2e53d63a | 208 | |
d828199e MT |
209 | void kvm_make_mclock_inprogress_request(struct kvm *kvm) |
210 | { | |
445b8236 | 211 | kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); |
d828199e MT |
212 | } |
213 | ||
3d81bc7e | 214 | void kvm_make_scan_ioapic_request(struct kvm *kvm) |
c7c9c56c | 215 | { |
445b8236 | 216 | kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); |
c7c9c56c YZ |
217 | } |
218 | ||
fb3f0f51 RR |
219 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
220 | { | |
221 | struct page *page; | |
222 | int r; | |
223 | ||
224 | mutex_init(&vcpu->mutex); | |
225 | vcpu->cpu = -1; | |
fb3f0f51 RR |
226 | vcpu->kvm = kvm; |
227 | vcpu->vcpu_id = id; | |
34bb10b7 | 228 | vcpu->pid = NULL; |
19020f8a | 229 | vcpu->halt_poll_ns = 0; |
b6958ce4 | 230 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 231 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
232 | |
233 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
234 | if (!page) { | |
235 | r = -ENOMEM; | |
236 | goto fail; | |
237 | } | |
238 | vcpu->run = page_address(page); | |
239 | ||
4c088493 R |
240 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
241 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 242 | vcpu->preempted = false; |
4c088493 | 243 | |
e9b11c17 | 244 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 245 | if (r < 0) |
e9b11c17 | 246 | goto fail_free_run; |
fb3f0f51 RR |
247 | return 0; |
248 | ||
fb3f0f51 RR |
249 | fail_free_run: |
250 | free_page((unsigned long)vcpu->run); | |
251 | fail: | |
76fafa5e | 252 | return r; |
fb3f0f51 RR |
253 | } |
254 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
255 | ||
256 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
257 | { | |
34bb10b7 | 258 | put_pid(vcpu->pid); |
e9b11c17 | 259 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
260 | free_page((unsigned long)vcpu->run); |
261 | } | |
262 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
263 | ||
e930bffe AA |
264 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
265 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
266 | { | |
267 | return container_of(mn, struct kvm, mmu_notifier); | |
268 | } | |
269 | ||
270 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
271 | struct mm_struct *mm, | |
272 | unsigned long address) | |
273 | { | |
274 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 275 | int need_tlb_flush, idx; |
e930bffe AA |
276 | |
277 | /* | |
278 | * When ->invalidate_page runs, the linux pte has been zapped | |
279 | * already but the page is still allocated until | |
280 | * ->invalidate_page returns. So if we increase the sequence | |
281 | * here the kvm page fault will notice if the spte can't be | |
282 | * established because the page is going to be freed. If | |
283 | * instead the kvm page fault establishes the spte before | |
284 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
285 | * before returning. | |
286 | * | |
287 | * The sequence increase only need to be seen at spin_unlock | |
288 | * time, and not at spin_lock time. | |
289 | * | |
290 | * Increasing the sequence after the spin_unlock would be | |
291 | * unsafe because the kvm page fault could then establish the | |
292 | * pte after kvm_unmap_hva returned, without noticing the page | |
293 | * is going to be freed. | |
294 | */ | |
bc6678a3 | 295 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 296 | spin_lock(&kvm->mmu_lock); |
565f3be2 | 297 | |
e930bffe | 298 | kvm->mmu_notifier_seq++; |
a4ee1ca4 | 299 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe AA |
300 | /* we've to flush the tlb before the pages can be freed */ |
301 | if (need_tlb_flush) | |
302 | kvm_flush_remote_tlbs(kvm); | |
303 | ||
565f3be2 | 304 | spin_unlock(&kvm->mmu_lock); |
fe71557a TC |
305 | |
306 | kvm_arch_mmu_notifier_invalidate_page(kvm, address); | |
307 | ||
565f3be2 | 308 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
309 | } |
310 | ||
3da0dd43 IE |
311 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
312 | struct mm_struct *mm, | |
313 | unsigned long address, | |
314 | pte_t pte) | |
315 | { | |
316 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 317 | int idx; |
3da0dd43 | 318 | |
bc6678a3 | 319 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
320 | spin_lock(&kvm->mmu_lock); |
321 | kvm->mmu_notifier_seq++; | |
322 | kvm_set_spte_hva(kvm, address, pte); | |
323 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 324 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
325 | } |
326 | ||
e930bffe AA |
327 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
328 | struct mm_struct *mm, | |
329 | unsigned long start, | |
330 | unsigned long end) | |
331 | { | |
332 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 333 | int need_tlb_flush = 0, idx; |
e930bffe | 334 | |
bc6678a3 | 335 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
336 | spin_lock(&kvm->mmu_lock); |
337 | /* | |
338 | * The count increase must become visible at unlock time as no | |
339 | * spte can be established without taking the mmu_lock and | |
340 | * count is also read inside the mmu_lock critical section. | |
341 | */ | |
342 | kvm->mmu_notifier_count++; | |
b3ae2096 | 343 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
a4ee1ca4 | 344 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
345 | /* we've to flush the tlb before the pages can be freed */ |
346 | if (need_tlb_flush) | |
347 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
348 | |
349 | spin_unlock(&kvm->mmu_lock); | |
350 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
351 | } |
352 | ||
353 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
354 | struct mm_struct *mm, | |
355 | unsigned long start, | |
356 | unsigned long end) | |
357 | { | |
358 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
359 | ||
360 | spin_lock(&kvm->mmu_lock); | |
361 | /* | |
362 | * This sequence increase will notify the kvm page fault that | |
363 | * the page that is going to be mapped in the spte could have | |
364 | * been freed. | |
365 | */ | |
366 | kvm->mmu_notifier_seq++; | |
a355aa54 | 367 | smp_wmb(); |
e930bffe AA |
368 | /* |
369 | * The above sequence increase must be visible before the | |
a355aa54 PM |
370 | * below count decrease, which is ensured by the smp_wmb above |
371 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
372 | */ |
373 | kvm->mmu_notifier_count--; | |
374 | spin_unlock(&kvm->mmu_lock); | |
375 | ||
376 | BUG_ON(kvm->mmu_notifier_count < 0); | |
377 | } | |
378 | ||
379 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
380 | struct mm_struct *mm, | |
57128468 ALC |
381 | unsigned long start, |
382 | unsigned long end) | |
e930bffe AA |
383 | { |
384 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 385 | int young, idx; |
e930bffe | 386 | |
bc6678a3 | 387 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 388 | spin_lock(&kvm->mmu_lock); |
e930bffe | 389 | |
57128468 | 390 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
391 | if (young) |
392 | kvm_flush_remote_tlbs(kvm); | |
393 | ||
565f3be2 TY |
394 | spin_unlock(&kvm->mmu_lock); |
395 | srcu_read_unlock(&kvm->srcu, idx); | |
396 | ||
e930bffe AA |
397 | return young; |
398 | } | |
399 | ||
1d7715c6 VD |
400 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
401 | struct mm_struct *mm, | |
402 | unsigned long start, | |
403 | unsigned long end) | |
404 | { | |
405 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
406 | int young, idx; | |
407 | ||
408 | idx = srcu_read_lock(&kvm->srcu); | |
409 | spin_lock(&kvm->mmu_lock); | |
410 | /* | |
411 | * Even though we do not flush TLB, this will still adversely | |
412 | * affect performance on pre-Haswell Intel EPT, where there is | |
413 | * no EPT Access Bit to clear so that we have to tear down EPT | |
414 | * tables instead. If we find this unacceptable, we can always | |
415 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
416 | * do anything on clear_young. | |
417 | * | |
418 | * Also note that currently we never issue secondary TLB flushes | |
419 | * from clear_young, leaving this job up to the regular system | |
420 | * cadence. If we find this inaccurate, we might come up with a | |
421 | * more sophisticated heuristic later. | |
422 | */ | |
423 | young = kvm_age_hva(kvm, start, end); | |
424 | spin_unlock(&kvm->mmu_lock); | |
425 | srcu_read_unlock(&kvm->srcu, idx); | |
426 | ||
427 | return young; | |
428 | } | |
429 | ||
8ee53820 AA |
430 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
431 | struct mm_struct *mm, | |
432 | unsigned long address) | |
433 | { | |
434 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
435 | int young, idx; | |
436 | ||
437 | idx = srcu_read_lock(&kvm->srcu); | |
438 | spin_lock(&kvm->mmu_lock); | |
439 | young = kvm_test_age_hva(kvm, address); | |
440 | spin_unlock(&kvm->mmu_lock); | |
441 | srcu_read_unlock(&kvm->srcu, idx); | |
442 | ||
443 | return young; | |
444 | } | |
445 | ||
85db06e5 MT |
446 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
447 | struct mm_struct *mm) | |
448 | { | |
449 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
450 | int idx; |
451 | ||
452 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 453 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 454 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
455 | } |
456 | ||
e930bffe AA |
457 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
458 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
459 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
460 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
461 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 462 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 463 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 464 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 465 | .release = kvm_mmu_notifier_release, |
e930bffe | 466 | }; |
4c07b0a4 AK |
467 | |
468 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
469 | { | |
470 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
471 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
472 | } | |
473 | ||
474 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
475 | ||
476 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
e930bffe AA |
481 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
482 | ||
a47d2b07 | 483 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
484 | { |
485 | int i; | |
a47d2b07 | 486 | struct kvm_memslots *slots; |
bf3e05bc | 487 | |
a47d2b07 PB |
488 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
489 | if (!slots) | |
490 | return NULL; | |
491 | ||
492 | /* | |
493 | * Init kvm generation close to the maximum to easily test the | |
494 | * code of handling generation number wrap-around. | |
495 | */ | |
496 | slots->generation = -150; | |
bf3e05bc | 497 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
f85e2cb5 | 498 | slots->id_to_index[i] = slots->memslots[i].id = i; |
a47d2b07 PB |
499 | |
500 | return slots; | |
501 | } | |
502 | ||
503 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
504 | { | |
505 | if (!memslot->dirty_bitmap) | |
506 | return; | |
507 | ||
508 | kvfree(memslot->dirty_bitmap); | |
509 | memslot->dirty_bitmap = NULL; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Free any memory in @free but not in @dont. | |
514 | */ | |
515 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
516 | struct kvm_memory_slot *dont) | |
517 | { | |
518 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
519 | kvm_destroy_dirty_bitmap(free); | |
520 | ||
521 | kvm_arch_free_memslot(kvm, free, dont); | |
522 | ||
523 | free->npages = 0; | |
524 | } | |
525 | ||
526 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
527 | { | |
528 | struct kvm_memory_slot *memslot; | |
529 | ||
530 | if (!slots) | |
531 | return; | |
532 | ||
533 | kvm_for_each_memslot(memslot, slots) | |
534 | kvm_free_memslot(kvm, memslot, NULL); | |
535 | ||
536 | kvfree(slots); | |
bf3e05bc XG |
537 | } |
538 | ||
e08b9637 | 539 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 540 | { |
d89f5eff JK |
541 | int r, i; |
542 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 543 | |
d89f5eff JK |
544 | if (!kvm) |
545 | return ERR_PTR(-ENOMEM); | |
546 | ||
e08b9637 | 547 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 548 | if (r) |
719d93cd | 549 | goto out_err_no_disable; |
10474ae8 AG |
550 | |
551 | r = hardware_enable_all(); | |
552 | if (r) | |
719d93cd | 553 | goto out_err_no_disable; |
10474ae8 | 554 | |
c77dcacb | 555 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 556 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 557 | #endif |
6aa8b732 | 558 | |
1e702d9a AW |
559 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
560 | ||
46a26bf5 | 561 | r = -ENOMEM; |
f481b069 PB |
562 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
563 | kvm->memslots[i] = kvm_alloc_memslots(); | |
564 | if (!kvm->memslots[i]) | |
565 | goto out_err_no_srcu; | |
566 | } | |
00f034a1 | 567 | |
bc6678a3 | 568 | if (init_srcu_struct(&kvm->srcu)) |
719d93cd CB |
569 | goto out_err_no_srcu; |
570 | if (init_srcu_struct(&kvm->irq_srcu)) | |
571 | goto out_err_no_irq_srcu; | |
e93f8a0f MT |
572 | for (i = 0; i < KVM_NR_BUSES; i++) { |
573 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
574 | GFP_KERNEL); | |
57e7fbee | 575 | if (!kvm->buses[i]) |
e93f8a0f | 576 | goto out_err; |
e93f8a0f | 577 | } |
e930bffe | 578 | |
74b5c5bf | 579 | spin_lock_init(&kvm->mmu_lock); |
6d4e4c4f AK |
580 | kvm->mm = current->mm; |
581 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 582 | kvm_eventfd_init(kvm); |
11ec2804 | 583 | mutex_init(&kvm->lock); |
60eead79 | 584 | mutex_init(&kvm->irq_lock); |
79fac95e | 585 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 586 | atomic_set(&kvm->users_count, 1); |
07f0a7bd | 587 | INIT_LIST_HEAD(&kvm->devices); |
74b5c5bf MW |
588 | |
589 | r = kvm_init_mmu_notifier(kvm); | |
590 | if (r) | |
591 | goto out_err; | |
592 | ||
2f303b74 | 593 | spin_lock(&kvm_lock); |
5e58cfe4 | 594 | list_add(&kvm->vm_list, &vm_list); |
2f303b74 | 595 | spin_unlock(&kvm_lock); |
d89f5eff | 596 | |
2ecd9d29 PZ |
597 | preempt_notifier_inc(); |
598 | ||
f17abe9a | 599 | return kvm; |
10474ae8 AG |
600 | |
601 | out_err: | |
719d93cd CB |
602 | cleanup_srcu_struct(&kvm->irq_srcu); |
603 | out_err_no_irq_srcu: | |
57e7fbee | 604 | cleanup_srcu_struct(&kvm->srcu); |
719d93cd | 605 | out_err_no_srcu: |
10474ae8 | 606 | hardware_disable_all(); |
719d93cd | 607 | out_err_no_disable: |
e93f8a0f MT |
608 | for (i = 0; i < KVM_NR_BUSES; i++) |
609 | kfree(kvm->buses[i]); | |
f481b069 PB |
610 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
611 | kvm_free_memslots(kvm, kvm->memslots[i]); | |
d89f5eff | 612 | kvm_arch_free_vm(kvm); |
10474ae8 | 613 | return ERR_PTR(r); |
f17abe9a AK |
614 | } |
615 | ||
92eca8fa TY |
616 | /* |
617 | * Avoid using vmalloc for a small buffer. | |
618 | * Should not be used when the size is statically known. | |
619 | */ | |
c1a7b32a | 620 | void *kvm_kvzalloc(unsigned long size) |
92eca8fa TY |
621 | { |
622 | if (size > PAGE_SIZE) | |
623 | return vzalloc(size); | |
624 | else | |
625 | return kzalloc(size, GFP_KERNEL); | |
626 | } | |
627 | ||
07f0a7bd SW |
628 | static void kvm_destroy_devices(struct kvm *kvm) |
629 | { | |
630 | struct list_head *node, *tmp; | |
631 | ||
632 | list_for_each_safe(node, tmp, &kvm->devices) { | |
633 | struct kvm_device *dev = | |
634 | list_entry(node, struct kvm_device, vm_node); | |
635 | ||
636 | list_del(node); | |
637 | dev->ops->destroy(dev); | |
638 | } | |
639 | } | |
640 | ||
f17abe9a AK |
641 | static void kvm_destroy_vm(struct kvm *kvm) |
642 | { | |
e93f8a0f | 643 | int i; |
6d4e4c4f AK |
644 | struct mm_struct *mm = kvm->mm; |
645 | ||
ad8ba2cd | 646 | kvm_arch_sync_events(kvm); |
2f303b74 | 647 | spin_lock(&kvm_lock); |
133de902 | 648 | list_del(&kvm->vm_list); |
2f303b74 | 649 | spin_unlock(&kvm_lock); |
399ec807 | 650 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
651 | for (i = 0; i < KVM_NR_BUSES; i++) |
652 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 653 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
654 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
655 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 656 | #else |
2df72e9b | 657 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 658 | #endif |
d19a9cd2 | 659 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 660 | kvm_destroy_devices(kvm); |
f481b069 PB |
661 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
662 | kvm_free_memslots(kvm, kvm->memslots[i]); | |
820b3fcd | 663 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
664 | cleanup_srcu_struct(&kvm->srcu); |
665 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 666 | preempt_notifier_dec(); |
10474ae8 | 667 | hardware_disable_all(); |
6d4e4c4f | 668 | mmdrop(mm); |
f17abe9a AK |
669 | } |
670 | ||
d39f13b0 IE |
671 | void kvm_get_kvm(struct kvm *kvm) |
672 | { | |
673 | atomic_inc(&kvm->users_count); | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
676 | ||
677 | void kvm_put_kvm(struct kvm *kvm) | |
678 | { | |
679 | if (atomic_dec_and_test(&kvm->users_count)) | |
680 | kvm_destroy_vm(kvm); | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
683 | ||
684 | ||
f17abe9a AK |
685 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
686 | { | |
687 | struct kvm *kvm = filp->private_data; | |
688 | ||
721eecbf GH |
689 | kvm_irqfd_release(kvm); |
690 | ||
d39f13b0 | 691 | kvm_put_kvm(kvm); |
6aa8b732 AK |
692 | return 0; |
693 | } | |
694 | ||
515a0127 TY |
695 | /* |
696 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 697 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 698 | */ |
a36a57b1 TY |
699 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
700 | { | |
515a0127 | 701 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 702 | |
92eca8fa | 703 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
a36a57b1 TY |
704 | if (!memslot->dirty_bitmap) |
705 | return -ENOMEM; | |
706 | ||
a36a57b1 TY |
707 | return 0; |
708 | } | |
709 | ||
bf3e05bc | 710 | /* |
0e60b079 IM |
711 | * Insert memslot and re-sort memslots based on their GFN, |
712 | * so binary search could be used to lookup GFN. | |
713 | * Sorting algorithm takes advantage of having initially | |
714 | * sorted array and known changed memslot position. | |
bf3e05bc | 715 | */ |
5cc15027 PB |
716 | static void update_memslots(struct kvm_memslots *slots, |
717 | struct kvm_memory_slot *new) | |
bf3e05bc | 718 | { |
8593176c PB |
719 | int id = new->id; |
720 | int i = slots->id_to_index[id]; | |
063584d4 | 721 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 722 | |
8593176c | 723 | WARN_ON(mslots[i].id != id); |
9c1a5d38 | 724 | if (!new->npages) { |
dbaff309 | 725 | WARN_ON(!mslots[i].npages); |
9c1a5d38 IM |
726 | if (mslots[i].npages) |
727 | slots->used_slots--; | |
728 | } else { | |
729 | if (!mslots[i].npages) | |
730 | slots->used_slots++; | |
731 | } | |
0e60b079 | 732 | |
7f379cff | 733 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
734 | new->base_gfn <= mslots[i + 1].base_gfn) { |
735 | if (!mslots[i + 1].npages) | |
736 | break; | |
7f379cff IM |
737 | mslots[i] = mslots[i + 1]; |
738 | slots->id_to_index[mslots[i].id] = i; | |
739 | i++; | |
740 | } | |
efbeec70 PB |
741 | |
742 | /* | |
743 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
744 | * so that it moves before all those with base_gfn == npages == 0. | |
745 | * | |
746 | * On the other hand, if new->npages is zero, the above loop has | |
747 | * already left i pointing to the beginning of the empty part of | |
748 | * mslots, and the ">=" would move the hole backwards in this | |
749 | * case---which is wrong. So skip the loop when deleting a slot. | |
750 | */ | |
751 | if (new->npages) { | |
752 | while (i > 0 && | |
753 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
754 | mslots[i] = mslots[i - 1]; | |
755 | slots->id_to_index[mslots[i].id] = i; | |
756 | i--; | |
757 | } | |
dbaff309 PB |
758 | } else |
759 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 760 | |
8593176c PB |
761 | mslots[i] = *new; |
762 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
763 | } |
764 | ||
09170a49 | 765 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 766 | { |
4d8b81ab XG |
767 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
768 | ||
0f8a4de3 | 769 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
770 | valid_flags |= KVM_MEM_READONLY; |
771 | #endif | |
772 | ||
773 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
774 | return -EINVAL; |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
7ec4fb44 | 779 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 780 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 781 | { |
f481b069 | 782 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
7ec4fb44 | 783 | |
ee3d1570 DM |
784 | /* |
785 | * Set the low bit in the generation, which disables SPTE caching | |
786 | * until the end of synchronize_srcu_expedited. | |
787 | */ | |
788 | WARN_ON(old_memslots->generation & 1); | |
789 | slots->generation = old_memslots->generation + 1; | |
790 | ||
f481b069 | 791 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 792 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 793 | |
ee3d1570 DM |
794 | /* |
795 | * Increment the new memslot generation a second time. This prevents | |
796 | * vm exits that race with memslot updates from caching a memslot | |
797 | * generation that will (potentially) be valid forever. | |
798 | */ | |
799 | slots->generation++; | |
800 | ||
15f46015 | 801 | kvm_arch_memslots_updated(kvm, slots); |
e59dbe09 TY |
802 | |
803 | return old_memslots; | |
7ec4fb44 GN |
804 | } |
805 | ||
6aa8b732 AK |
806 | /* |
807 | * Allocate some memory and give it an address in the guest physical address | |
808 | * space. | |
809 | * | |
810 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 811 | * |
02d5d55b | 812 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 813 | */ |
f78e0e2e | 814 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 815 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 816 | { |
8234b22e | 817 | int r; |
6aa8b732 | 818 | gfn_t base_gfn; |
28bcb112 | 819 | unsigned long npages; |
a843fac2 | 820 | struct kvm_memory_slot *slot; |
6aa8b732 | 821 | struct kvm_memory_slot old, new; |
b7f69c55 | 822 | struct kvm_memslots *slots = NULL, *old_memslots; |
f481b069 | 823 | int as_id, id; |
f64c0398 | 824 | enum kvm_mr_change change; |
6aa8b732 | 825 | |
a50d64d6 XG |
826 | r = check_memory_region_flags(mem); |
827 | if (r) | |
828 | goto out; | |
829 | ||
6aa8b732 | 830 | r = -EINVAL; |
f481b069 PB |
831 | as_id = mem->slot >> 16; |
832 | id = (u16)mem->slot; | |
833 | ||
6aa8b732 AK |
834 | /* General sanity checks */ |
835 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
836 | goto out; | |
837 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
838 | goto out; | |
fa3d315a | 839 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 840 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 841 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
9e3bb6b6 HC |
842 | !access_ok(VERIFY_WRITE, |
843 | (void __user *)(unsigned long)mem->userspace_addr, | |
844 | mem->memory_size))) | |
78749809 | 845 | goto out; |
f481b069 | 846 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
847 | goto out; |
848 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
849 | goto out; | |
850 | ||
f481b069 | 851 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
6aa8b732 AK |
852 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
853 | npages = mem->memory_size >> PAGE_SHIFT; | |
854 | ||
660c22c4 TY |
855 | if (npages > KVM_MEM_MAX_NR_PAGES) |
856 | goto out; | |
857 | ||
a843fac2 | 858 | new = old = *slot; |
6aa8b732 | 859 | |
f481b069 | 860 | new.id = id; |
6aa8b732 AK |
861 | new.base_gfn = base_gfn; |
862 | new.npages = npages; | |
863 | new.flags = mem->flags; | |
864 | ||
f64c0398 TY |
865 | if (npages) { |
866 | if (!old.npages) | |
867 | change = KVM_MR_CREATE; | |
868 | else { /* Modify an existing slot. */ | |
869 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
870 | (npages != old.npages) || |
871 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
872 | goto out; |
873 | ||
874 | if (base_gfn != old.base_gfn) | |
875 | change = KVM_MR_MOVE; | |
876 | else if (new.flags != old.flags) | |
877 | change = KVM_MR_FLAGS_ONLY; | |
878 | else { /* Nothing to change. */ | |
879 | r = 0; | |
880 | goto out; | |
881 | } | |
882 | } | |
09170a49 PB |
883 | } else { |
884 | if (!old.npages) | |
885 | goto out; | |
886 | ||
f64c0398 | 887 | change = KVM_MR_DELETE; |
09170a49 PB |
888 | new.base_gfn = 0; |
889 | new.flags = 0; | |
890 | } | |
6aa8b732 | 891 | |
f64c0398 | 892 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
893 | /* Check for overlaps */ |
894 | r = -EEXIST; | |
f481b069 | 895 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
a843fac2 | 896 | if ((slot->id >= KVM_USER_MEM_SLOTS) || |
f481b069 | 897 | (slot->id == id)) |
0a706bee TY |
898 | continue; |
899 | if (!((base_gfn + npages <= slot->base_gfn) || | |
900 | (base_gfn >= slot->base_gfn + slot->npages))) | |
901 | goto out; | |
902 | } | |
6aa8b732 | 903 | } |
6aa8b732 | 904 | |
6aa8b732 AK |
905 | /* Free page dirty bitmap if unneeded */ |
906 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 907 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
908 | |
909 | r = -ENOMEM; | |
f64c0398 | 910 | if (change == KVM_MR_CREATE) { |
189a2f7b | 911 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 912 | |
5587027c | 913 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 914 | goto out_free; |
6aa8b732 | 915 | } |
ec04b260 | 916 | |
6aa8b732 AK |
917 | /* Allocate page dirty bitmap if needed */ |
918 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 919 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 920 | goto out_free; |
6aa8b732 AK |
921 | } |
922 | ||
74496134 | 923 | slots = kvm_kvzalloc(sizeof(struct kvm_memslots)); |
f2a81036 PB |
924 | if (!slots) |
925 | goto out_free; | |
f481b069 | 926 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
f2a81036 | 927 | |
f64c0398 | 928 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
f481b069 | 929 | slot = id_to_memslot(slots, id); |
28a37544 XG |
930 | slot->flags |= KVM_MEMSLOT_INVALID; |
931 | ||
f481b069 | 932 | old_memslots = install_new_memslots(kvm, as_id, slots); |
bc6678a3 | 933 | |
e40f193f AW |
934 | /* slot was deleted or moved, clear iommu mapping */ |
935 | kvm_iommu_unmap_pages(kvm, &old); | |
12d6e753 MT |
936 | /* From this point no new shadow pages pointing to a deleted, |
937 | * or moved, memslot will be created. | |
bc6678a3 MT |
938 | * |
939 | * validation of sp->gfn happens in: | |
b7d409de XL |
940 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
941 | * - kvm_is_visible_gfn (mmu_check_roots) | |
bc6678a3 | 942 | */ |
2df72e9b | 943 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
944 | |
945 | /* | |
946 | * We can re-use the old_memslots from above, the only difference | |
947 | * from the currently installed memslots is the invalid flag. This | |
948 | * will get overwritten by update_memslots anyway. | |
949 | */ | |
b7f69c55 | 950 | slots = old_memslots; |
bc6678a3 | 951 | } |
34d4cb8f | 952 | |
7b6195a9 | 953 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 954 | if (r) |
b7f69c55 | 955 | goto out_slots; |
f7784b8e | 956 | |
a47d2b07 | 957 | /* actual memory is freed via old in kvm_free_memslot below */ |
f64c0398 | 958 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 959 | new.dirty_bitmap = NULL; |
db3fe4eb | 960 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
961 | } |
962 | ||
5cc15027 | 963 | update_memslots(slots, &new); |
f481b069 | 964 | old_memslots = install_new_memslots(kvm, as_id, slots); |
3ad82a7e | 965 | |
f36f3f28 | 966 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
82ce2c96 | 967 | |
a47d2b07 | 968 | kvm_free_memslot(kvm, &old, &new); |
74496134 | 969 | kvfree(old_memslots); |
bc6678a3 | 970 | |
261874b0 AW |
971 | /* |
972 | * IOMMU mapping: New slots need to be mapped. Old slots need to be | |
75d61fbc TY |
973 | * un-mapped and re-mapped if their base changes. Since base change |
974 | * unmapping is handled above with slot deletion, mapping alone is | |
975 | * needed here. Anything else the iommu might care about for existing | |
976 | * slots (size changes, userspace addr changes and read-only flag | |
977 | * changes) is disallowed above, so any other attribute changes getting | |
978 | * here can be skipped. | |
261874b0 | 979 | */ |
75d61fbc TY |
980 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
981 | r = kvm_iommu_map_pages(kvm, &new); | |
e0230e13 | 982 | return r; |
bc6678a3 MT |
983 | } |
984 | ||
6aa8b732 AK |
985 | return 0; |
986 | ||
e40f193f | 987 | out_slots: |
74496134 | 988 | kvfree(slots); |
f78e0e2e | 989 | out_free: |
a47d2b07 | 990 | kvm_free_memslot(kvm, &new, &old); |
6aa8b732 AK |
991 | out: |
992 | return r; | |
210c7c4d | 993 | } |
f78e0e2e SY |
994 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
995 | ||
996 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 997 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
998 | { |
999 | int r; | |
1000 | ||
79fac95e | 1001 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1002 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1003 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1004 | return r; |
1005 | } | |
210c7c4d IE |
1006 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1007 | ||
7940876e SH |
1008 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1009 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1010 | { |
f481b069 | 1011 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1012 | return -EINVAL; |
09170a49 | 1013 | |
47ae31e2 | 1014 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1015 | } |
1016 | ||
5bb064dc ZX |
1017 | int kvm_get_dirty_log(struct kvm *kvm, |
1018 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 | 1019 | { |
9f6b8029 | 1020 | struct kvm_memslots *slots; |
6aa8b732 | 1021 | struct kvm_memory_slot *memslot; |
f481b069 | 1022 | int r, i, as_id, id; |
87bf6e7d | 1023 | unsigned long n; |
6aa8b732 AK |
1024 | unsigned long any = 0; |
1025 | ||
6aa8b732 | 1026 | r = -EINVAL; |
f481b069 PB |
1027 | as_id = log->slot >> 16; |
1028 | id = (u16)log->slot; | |
1029 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
6aa8b732 AK |
1030 | goto out; |
1031 | ||
f481b069 PB |
1032 | slots = __kvm_memslots(kvm, as_id); |
1033 | memslot = id_to_memslot(slots, id); | |
6aa8b732 AK |
1034 | r = -ENOENT; |
1035 | if (!memslot->dirty_bitmap) | |
1036 | goto out; | |
1037 | ||
87bf6e7d | 1038 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 1039 | |
cd1a4a98 | 1040 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
1041 | any = memslot->dirty_bitmap[i]; |
1042 | ||
1043 | r = -EFAULT; | |
1044 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
1045 | goto out; | |
1046 | ||
5bb064dc ZX |
1047 | if (any) |
1048 | *is_dirty = 1; | |
6aa8b732 AK |
1049 | |
1050 | r = 0; | |
6aa8b732 | 1051 | out: |
6aa8b732 AK |
1052 | return r; |
1053 | } | |
2ba9f0d8 | 1054 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1055 | |
ba0513b5 MS |
1056 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
1057 | /** | |
1058 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages | |
1059 | * are dirty write protect them for next write. | |
1060 | * @kvm: pointer to kvm instance | |
1061 | * @log: slot id and address to which we copy the log | |
1062 | * @is_dirty: flag set if any page is dirty | |
1063 | * | |
1064 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1065 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1066 | * following order: | |
1067 | * | |
1068 | * 1. Take a snapshot of the bit and clear it if needed. | |
1069 | * 2. Write protect the corresponding page. | |
1070 | * 3. Copy the snapshot to the userspace. | |
1071 | * 4. Upon return caller flushes TLB's if needed. | |
1072 | * | |
1073 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1074 | * entry. This is not a problem because the page is reported dirty using | |
1075 | * the snapshot taken before and step 4 ensures that writes done after | |
1076 | * exiting to userspace will be logged for the next call. | |
1077 | * | |
1078 | */ | |
1079 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
1080 | struct kvm_dirty_log *log, bool *is_dirty) | |
1081 | { | |
9f6b8029 | 1082 | struct kvm_memslots *slots; |
ba0513b5 | 1083 | struct kvm_memory_slot *memslot; |
f481b069 | 1084 | int r, i, as_id, id; |
ba0513b5 MS |
1085 | unsigned long n; |
1086 | unsigned long *dirty_bitmap; | |
1087 | unsigned long *dirty_bitmap_buffer; | |
1088 | ||
1089 | r = -EINVAL; | |
f481b069 PB |
1090 | as_id = log->slot >> 16; |
1091 | id = (u16)log->slot; | |
1092 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
ba0513b5 MS |
1093 | goto out; |
1094 | ||
f481b069 PB |
1095 | slots = __kvm_memslots(kvm, as_id); |
1096 | memslot = id_to_memslot(slots, id); | |
ba0513b5 MS |
1097 | |
1098 | dirty_bitmap = memslot->dirty_bitmap; | |
1099 | r = -ENOENT; | |
1100 | if (!dirty_bitmap) | |
1101 | goto out; | |
1102 | ||
1103 | n = kvm_dirty_bitmap_bytes(memslot); | |
1104 | ||
1105 | dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long); | |
1106 | memset(dirty_bitmap_buffer, 0, n); | |
1107 | ||
1108 | spin_lock(&kvm->mmu_lock); | |
1109 | *is_dirty = false; | |
1110 | for (i = 0; i < n / sizeof(long); i++) { | |
1111 | unsigned long mask; | |
1112 | gfn_t offset; | |
1113 | ||
1114 | if (!dirty_bitmap[i]) | |
1115 | continue; | |
1116 | ||
1117 | *is_dirty = true; | |
1118 | ||
1119 | mask = xchg(&dirty_bitmap[i], 0); | |
1120 | dirty_bitmap_buffer[i] = mask; | |
1121 | ||
58d2930f TY |
1122 | if (mask) { |
1123 | offset = i * BITS_PER_LONG; | |
1124 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1125 | offset, mask); | |
1126 | } | |
ba0513b5 MS |
1127 | } |
1128 | ||
1129 | spin_unlock(&kvm->mmu_lock); | |
1130 | ||
1131 | r = -EFAULT; | |
1132 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1133 | goto out; | |
1134 | ||
1135 | r = 0; | |
1136 | out: | |
1137 | return r; | |
1138 | } | |
1139 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1140 | #endif | |
1141 | ||
db3fe4eb TY |
1142 | bool kvm_largepages_enabled(void) |
1143 | { | |
1144 | return largepages_enabled; | |
1145 | } | |
1146 | ||
54dee993 MT |
1147 | void kvm_disable_largepages(void) |
1148 | { | |
1149 | largepages_enabled = false; | |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1152 | ||
49c7754c GN |
1153 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1154 | { | |
1155 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1156 | } | |
a1f4d395 | 1157 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1158 | |
8e73485c PB |
1159 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1160 | { | |
1161 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1162 | } | |
1163 | ||
e0d62c7f IE |
1164 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
1165 | { | |
bf3e05bc | 1166 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1167 | |
bbacc0c1 | 1168 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc XG |
1169 | memslot->flags & KVM_MEMSLOT_INVALID) |
1170 | return 0; | |
e0d62c7f | 1171 | |
bf3e05bc | 1172 | return 1; |
e0d62c7f IE |
1173 | } |
1174 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1175 | ||
8f0b1ab6 JR |
1176 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1177 | { | |
1178 | struct vm_area_struct *vma; | |
1179 | unsigned long addr, size; | |
1180 | ||
1181 | size = PAGE_SIZE; | |
1182 | ||
1183 | addr = gfn_to_hva(kvm, gfn); | |
1184 | if (kvm_is_error_hva(addr)) | |
1185 | return PAGE_SIZE; | |
1186 | ||
1187 | down_read(¤t->mm->mmap_sem); | |
1188 | vma = find_vma(current->mm, addr); | |
1189 | if (!vma) | |
1190 | goto out; | |
1191 | ||
1192 | size = vma_kernel_pagesize(vma); | |
1193 | ||
1194 | out: | |
1195 | up_read(¤t->mm->mmap_sem); | |
1196 | ||
1197 | return size; | |
1198 | } | |
1199 | ||
4d8b81ab XG |
1200 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1201 | { | |
1202 | return slot->flags & KVM_MEM_READONLY; | |
1203 | } | |
1204 | ||
4d8b81ab XG |
1205 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1206 | gfn_t *nr_pages, bool write) | |
539cb660 | 1207 | { |
bc6678a3 | 1208 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1209 | return KVM_HVA_ERR_BAD; |
48987781 | 1210 | |
4d8b81ab XG |
1211 | if (memslot_is_readonly(slot) && write) |
1212 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1213 | |
1214 | if (nr_pages) | |
1215 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1216 | ||
4d8b81ab | 1217 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1218 | } |
48987781 | 1219 | |
4d8b81ab XG |
1220 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1221 | gfn_t *nr_pages) | |
1222 | { | |
1223 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1224 | } |
48987781 | 1225 | |
4d8b81ab | 1226 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1227 | gfn_t gfn) |
4d8b81ab XG |
1228 | { |
1229 | return gfn_to_hva_many(slot, gfn, NULL); | |
1230 | } | |
1231 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1232 | ||
48987781 XG |
1233 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1234 | { | |
49c7754c | 1235 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1236 | } |
0d150298 | 1237 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1238 | |
8e73485c PB |
1239 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1240 | { | |
1241 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1242 | } | |
1243 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1244 | ||
86ab8cff | 1245 | /* |
ba6a3541 PB |
1246 | * If writable is set to false, the hva returned by this function is only |
1247 | * allowed to be read. | |
86ab8cff | 1248 | */ |
64d83126 CD |
1249 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1250 | gfn_t gfn, bool *writable) | |
86ab8cff | 1251 | { |
a2ac07fe GN |
1252 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1253 | ||
1254 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1255 | *writable = !memslot_is_readonly(slot); |
1256 | ||
a2ac07fe | 1257 | return hva; |
86ab8cff XG |
1258 | } |
1259 | ||
64d83126 CD |
1260 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1261 | { | |
1262 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1263 | ||
1264 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1265 | } | |
1266 | ||
8e73485c PB |
1267 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1268 | { | |
1269 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1270 | ||
1271 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1272 | } | |
1273 | ||
39369f7a | 1274 | static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
0857b9e9 GN |
1275 | unsigned long start, int write, struct page **page) |
1276 | { | |
1277 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1278 | ||
1279 | if (write) | |
1280 | flags |= FOLL_WRITE; | |
1281 | ||
1282 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1283 | } | |
1284 | ||
fafc3dba HY |
1285 | static inline int check_user_page_hwpoison(unsigned long addr) |
1286 | { | |
1287 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1288 | ||
1289 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1290 | flags, NULL, NULL, NULL); | |
1291 | return rc == -EHWPOISON; | |
1292 | } | |
1293 | ||
2fc84311 XG |
1294 | /* |
1295 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1296 | * true indicates success, otherwise false is returned. | |
1297 | */ | |
1298 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1299 | bool write_fault, bool *writable, pfn_t *pfn) | |
954bbbc2 | 1300 | { |
8d4e1288 | 1301 | struct page *page[1]; |
2fc84311 | 1302 | int npages; |
954bbbc2 | 1303 | |
2fc84311 XG |
1304 | if (!(async || atomic)) |
1305 | return false; | |
af585b92 | 1306 | |
12ce13fe XG |
1307 | /* |
1308 | * Fast pin a writable pfn only if it is a write fault request | |
1309 | * or the caller allows to map a writable pfn for a read fault | |
1310 | * request. | |
1311 | */ | |
1312 | if (!(write_fault || writable)) | |
1313 | return false; | |
612819c3 | 1314 | |
2fc84311 XG |
1315 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1316 | if (npages == 1) { | |
1317 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1318 | |
2fc84311 XG |
1319 | if (writable) |
1320 | *writable = true; | |
1321 | return true; | |
1322 | } | |
af585b92 | 1323 | |
2fc84311 XG |
1324 | return false; |
1325 | } | |
612819c3 | 1326 | |
2fc84311 XG |
1327 | /* |
1328 | * The slow path to get the pfn of the specified host virtual address, | |
1329 | * 1 indicates success, -errno is returned if error is detected. | |
1330 | */ | |
1331 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1332 | bool *writable, pfn_t *pfn) | |
1333 | { | |
1334 | struct page *page[1]; | |
1335 | int npages = 0; | |
612819c3 | 1336 | |
2fc84311 XG |
1337 | might_sleep(); |
1338 | ||
1339 | if (writable) | |
1340 | *writable = write_fault; | |
1341 | ||
1342 | if (async) { | |
1343 | down_read(¤t->mm->mmap_sem); | |
1344 | npages = get_user_page_nowait(current, current->mm, | |
1345 | addr, write_fault, page); | |
1346 | up_read(¤t->mm->mmap_sem); | |
0664e57f AA |
1347 | } else |
1348 | npages = __get_user_pages_unlocked(current, current->mm, addr, 1, | |
1349 | write_fault, 0, page, | |
1350 | FOLL_TOUCH|FOLL_HWPOISON); | |
2fc84311 XG |
1351 | if (npages != 1) |
1352 | return npages; | |
1353 | ||
1354 | /* map read fault as writable if possible */ | |
12ce13fe | 1355 | if (unlikely(!write_fault) && writable) { |
2fc84311 XG |
1356 | struct page *wpage[1]; |
1357 | ||
1358 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1359 | if (npages == 1) { | |
1360 | *writable = true; | |
1361 | put_page(page[0]); | |
1362 | page[0] = wpage[0]; | |
612819c3 | 1363 | } |
2fc84311 XG |
1364 | |
1365 | npages = 1; | |
887c08ac | 1366 | } |
2fc84311 XG |
1367 | *pfn = page_to_pfn(page[0]); |
1368 | return npages; | |
1369 | } | |
539cb660 | 1370 | |
4d8b81ab XG |
1371 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1372 | { | |
1373 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1374 | return false; | |
2e2e3738 | 1375 | |
4d8b81ab XG |
1376 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1377 | return false; | |
887c08ac | 1378 | |
4d8b81ab XG |
1379 | return true; |
1380 | } | |
bf998156 | 1381 | |
12ce13fe XG |
1382 | /* |
1383 | * Pin guest page in memory and return its pfn. | |
1384 | * @addr: host virtual address which maps memory to the guest | |
1385 | * @atomic: whether this function can sleep | |
1386 | * @async: whether this function need to wait IO complete if the | |
1387 | * host page is not in the memory | |
1388 | * @write_fault: whether we should get a writable host page | |
1389 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1390 | * | |
1391 | * The function will map a writable host page for these two cases: | |
1392 | * 1): @write_fault = true | |
1393 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1394 | * whether the mapping is writable. | |
1395 | */ | |
2fc84311 XG |
1396 | static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
1397 | bool write_fault, bool *writable) | |
1398 | { | |
1399 | struct vm_area_struct *vma; | |
1400 | pfn_t pfn = 0; | |
1401 | int npages; | |
2e2e3738 | 1402 | |
2fc84311 XG |
1403 | /* we can do it either atomically or asynchronously, not both */ |
1404 | BUG_ON(atomic && async); | |
8d4e1288 | 1405 | |
2fc84311 XG |
1406 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
1407 | return pfn; | |
1408 | ||
1409 | if (atomic) | |
1410 | return KVM_PFN_ERR_FAULT; | |
1411 | ||
1412 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1413 | if (npages == 1) | |
1414 | return pfn; | |
8d4e1288 | 1415 | |
2fc84311 XG |
1416 | down_read(¤t->mm->mmap_sem); |
1417 | if (npages == -EHWPOISON || | |
1418 | (!async && check_user_page_hwpoison(addr))) { | |
1419 | pfn = KVM_PFN_ERR_HWPOISON; | |
1420 | goto exit; | |
1421 | } | |
1422 | ||
1423 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1424 | ||
1425 | if (vma == NULL) | |
1426 | pfn = KVM_PFN_ERR_FAULT; | |
1427 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1428 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1429 | vma->vm_pgoff; | |
bf4bea8e | 1430 | BUG_ON(!kvm_is_reserved_pfn(pfn)); |
2fc84311 | 1431 | } else { |
4d8b81ab | 1432 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1433 | *async = true; |
1434 | pfn = KVM_PFN_ERR_FAULT; | |
1435 | } | |
1436 | exit: | |
1437 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1438 | return pfn; |
35149e21 AL |
1439 | } |
1440 | ||
3520469d PB |
1441 | pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, |
1442 | bool *async, bool write_fault, bool *writable) | |
887c08ac | 1443 | { |
4d8b81ab XG |
1444 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1445 | ||
1446 | if (addr == KVM_HVA_ERR_RO_BAD) | |
1447 | return KVM_PFN_ERR_RO_FAULT; | |
1448 | ||
1449 | if (kvm_is_error_hva(addr)) | |
81c52c56 | 1450 | return KVM_PFN_NOSLOT; |
4d8b81ab XG |
1451 | |
1452 | /* Do not map writable pfn in the readonly memslot. */ | |
1453 | if (writable && memslot_is_readonly(slot)) { | |
1454 | *writable = false; | |
1455 | writable = NULL; | |
1456 | } | |
1457 | ||
1458 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1459 | writable); | |
887c08ac | 1460 | } |
3520469d | 1461 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1462 | |
612819c3 MT |
1463 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1464 | bool *writable) | |
1465 | { | |
e37afc6e PB |
1466 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1467 | write_fault, writable); | |
612819c3 MT |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1470 | ||
d5661048 | 1471 | pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1472 | { |
4d8b81ab | 1473 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1474 | } |
e37afc6e | 1475 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1476 | |
037d92dc | 1477 | pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1478 | { |
4d8b81ab | 1479 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1480 | } |
037d92dc | 1481 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1482 | |
e37afc6e PB |
1483 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
1484 | { | |
1485 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1486 | } | |
1487 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1488 | ||
8e73485c PB |
1489 | pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
1490 | { | |
1491 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1492 | } | |
1493 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1494 | ||
e37afc6e PB |
1495 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1496 | { | |
1497 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1498 | } | |
1499 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1500 | ||
8e73485c PB |
1501 | pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
1502 | { | |
1503 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1504 | } | |
1505 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1506 | ||
d9ef13c2 PB |
1507 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1508 | struct page **pages, int nr_pages) | |
48987781 XG |
1509 | { |
1510 | unsigned long addr; | |
1511 | gfn_t entry; | |
1512 | ||
d9ef13c2 | 1513 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
1514 | if (kvm_is_error_hva(addr)) |
1515 | return -1; | |
1516 | ||
1517 | if (entry < nr_pages) | |
1518 | return 0; | |
1519 | ||
1520 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1521 | } | |
1522 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1523 | ||
a2766325 XG |
1524 | static struct page *kvm_pfn_to_page(pfn_t pfn) |
1525 | { | |
81c52c56 | 1526 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1527 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1528 | |
bf4bea8e | 1529 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1530 | WARN_ON(1); |
6cede2e6 | 1531 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1532 | } |
a2766325 XG |
1533 | |
1534 | return pfn_to_page(pfn); | |
1535 | } | |
1536 | ||
35149e21 AL |
1537 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1538 | { | |
2e2e3738 AL |
1539 | pfn_t pfn; |
1540 | ||
1541 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1542 | |
a2766325 | 1543 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
1544 | } |
1545 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1546 | ||
8e73485c PB |
1547 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
1548 | { | |
1549 | pfn_t pfn; | |
1550 | ||
1551 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1552 | ||
1553 | return kvm_pfn_to_page(pfn); | |
1554 | } | |
1555 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1556 | ||
b4231d61 IE |
1557 | void kvm_release_page_clean(struct page *page) |
1558 | { | |
32cad84f XG |
1559 | WARN_ON(is_error_page(page)); |
1560 | ||
35149e21 | 1561 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1562 | } |
1563 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1564 | ||
35149e21 AL |
1565 | void kvm_release_pfn_clean(pfn_t pfn) |
1566 | { | |
bf4bea8e | 1567 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1568 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1569 | } |
1570 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1571 | ||
b4231d61 | 1572 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1573 | { |
a2766325 XG |
1574 | WARN_ON(is_error_page(page)); |
1575 | ||
35149e21 AL |
1576 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1577 | } | |
1578 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1579 | ||
7940876e | 1580 | static void kvm_release_pfn_dirty(pfn_t pfn) |
35149e21 AL |
1581 | { |
1582 | kvm_set_pfn_dirty(pfn); | |
1583 | kvm_release_pfn_clean(pfn); | |
1584 | } | |
35149e21 AL |
1585 | |
1586 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1587 | { | |
bf4bea8e | 1588 | if (!kvm_is_reserved_pfn(pfn)) { |
2e2e3738 | 1589 | struct page *page = pfn_to_page(pfn); |
f95ef0cd | 1590 | |
2e2e3738 AL |
1591 | if (!PageReserved(page)) |
1592 | SetPageDirty(page); | |
1593 | } | |
8a7ae055 | 1594 | } |
35149e21 AL |
1595 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1596 | ||
1597 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1598 | { | |
bf4bea8e | 1599 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1600 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1601 | } |
1602 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1603 | ||
1604 | void kvm_get_pfn(pfn_t pfn) | |
1605 | { | |
bf4bea8e | 1606 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1607 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1608 | } |
1609 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1610 | |
195aefde IE |
1611 | static int next_segment(unsigned long len, int offset) |
1612 | { | |
1613 | if (len > PAGE_SIZE - offset) | |
1614 | return PAGE_SIZE - offset; | |
1615 | else | |
1616 | return len; | |
1617 | } | |
1618 | ||
8e73485c PB |
1619 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
1620 | void *data, int offset, int len) | |
195aefde | 1621 | { |
e0506bcb IE |
1622 | int r; |
1623 | unsigned long addr; | |
195aefde | 1624 | |
8e73485c | 1625 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
1626 | if (kvm_is_error_hva(addr)) |
1627 | return -EFAULT; | |
3180a7fc | 1628 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1629 | if (r) |
195aefde | 1630 | return -EFAULT; |
195aefde IE |
1631 | return 0; |
1632 | } | |
8e73485c PB |
1633 | |
1634 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1635 | int len) | |
1636 | { | |
1637 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1638 | ||
1639 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1640 | } | |
195aefde IE |
1641 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1642 | ||
8e73485c PB |
1643 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
1644 | int offset, int len) | |
1645 | { | |
1646 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1647 | ||
1648 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1649 | } | |
1650 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1651 | ||
195aefde IE |
1652 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1653 | { | |
1654 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1655 | int seg; | |
1656 | int offset = offset_in_page(gpa); | |
1657 | int ret; | |
1658 | ||
1659 | while ((seg = next_segment(len, offset)) != 0) { | |
1660 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1661 | if (ret < 0) | |
1662 | return ret; | |
1663 | offset = 0; | |
1664 | len -= seg; | |
1665 | data += seg; | |
1666 | ++gfn; | |
1667 | } | |
1668 | return 0; | |
1669 | } | |
1670 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1671 | ||
8e73485c | 1672 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 1673 | { |
7ec54588 | 1674 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 1675 | int seg; |
7ec54588 | 1676 | int offset = offset_in_page(gpa); |
8e73485c PB |
1677 | int ret; |
1678 | ||
1679 | while ((seg = next_segment(len, offset)) != 0) { | |
1680 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
1681 | if (ret < 0) | |
1682 | return ret; | |
1683 | offset = 0; | |
1684 | len -= seg; | |
1685 | data += seg; | |
1686 | ++gfn; | |
1687 | } | |
1688 | return 0; | |
1689 | } | |
1690 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 1691 | |
8e73485c PB |
1692 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1693 | void *data, int offset, unsigned long len) | |
1694 | { | |
1695 | int r; | |
1696 | unsigned long addr; | |
1697 | ||
1698 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
1699 | if (kvm_is_error_hva(addr)) |
1700 | return -EFAULT; | |
0aac03f0 | 1701 | pagefault_disable(); |
3180a7fc | 1702 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1703 | pagefault_enable(); |
7ec54588 MT |
1704 | if (r) |
1705 | return -EFAULT; | |
1706 | return 0; | |
1707 | } | |
7ec54588 | 1708 | |
8e73485c PB |
1709 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1710 | unsigned long len) | |
1711 | { | |
1712 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1713 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1714 | int offset = offset_in_page(gpa); | |
1715 | ||
1716 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1717 | } | |
1718 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1719 | ||
1720 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1721 | void *data, unsigned long len) | |
1722 | { | |
1723 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1724 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1725 | int offset = offset_in_page(gpa); | |
1726 | ||
1727 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1728 | } | |
1729 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1730 | ||
1731 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1732 | const void *data, int offset, int len) | |
195aefde | 1733 | { |
e0506bcb IE |
1734 | int r; |
1735 | unsigned long addr; | |
195aefde | 1736 | |
251eb841 | 1737 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
1738 | if (kvm_is_error_hva(addr)) |
1739 | return -EFAULT; | |
8b0cedff | 1740 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1741 | if (r) |
195aefde | 1742 | return -EFAULT; |
bc009e43 | 1743 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
1744 | return 0; |
1745 | } | |
8e73485c PB |
1746 | |
1747 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
1748 | const void *data, int offset, int len) | |
1749 | { | |
1750 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1751 | ||
1752 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1753 | } | |
195aefde IE |
1754 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
1755 | ||
8e73485c PB |
1756 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
1757 | const void *data, int offset, int len) | |
1758 | { | |
1759 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1760 | ||
1761 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1762 | } | |
1763 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
1764 | ||
195aefde IE |
1765 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
1766 | unsigned long len) | |
1767 | { | |
1768 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1769 | int seg; | |
1770 | int offset = offset_in_page(gpa); | |
1771 | int ret; | |
1772 | ||
1773 | while ((seg = next_segment(len, offset)) != 0) { | |
1774 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1775 | if (ret < 0) | |
1776 | return ret; | |
1777 | offset = 0; | |
1778 | len -= seg; | |
1779 | data += seg; | |
1780 | ++gfn; | |
1781 | } | |
1782 | return 0; | |
1783 | } | |
ff651cb6 | 1784 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 1785 | |
8e73485c PB |
1786 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
1787 | unsigned long len) | |
1788 | { | |
1789 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1790 | int seg; | |
1791 | int offset = offset_in_page(gpa); | |
1792 | int ret; | |
1793 | ||
1794 | while ((seg = next_segment(len, offset)) != 0) { | |
1795 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
1796 | if (ret < 0) | |
1797 | return ret; | |
1798 | offset = 0; | |
1799 | len -= seg; | |
1800 | data += seg; | |
1801 | ++gfn; | |
1802 | } | |
1803 | return 0; | |
1804 | } | |
1805 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
1806 | ||
49c7754c | 1807 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
8f964525 | 1808 | gpa_t gpa, unsigned long len) |
49c7754c GN |
1809 | { |
1810 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1811 | int offset = offset_in_page(gpa); | |
8f964525 AH |
1812 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
1813 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1814 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1815 | gfn_t nr_pages_avail; | |
49c7754c GN |
1816 | |
1817 | ghc->gpa = gpa; | |
1818 | ghc->generation = slots->generation; | |
8f964525 AH |
1819 | ghc->len = len; |
1820 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
ca3f0874 RK |
1821 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); |
1822 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { | |
49c7754c | 1823 | ghc->hva += offset; |
8f964525 AH |
1824 | } else { |
1825 | /* | |
1826 | * If the requested region crosses two memslots, we still | |
1827 | * verify that the entire region is valid here. | |
1828 | */ | |
1829 | while (start_gfn <= end_gfn) { | |
1830 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
1831 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
1832 | &nr_pages_avail); | |
1833 | if (kvm_is_error_hva(ghc->hva)) | |
1834 | return -EFAULT; | |
1835 | start_gfn += nr_pages_avail; | |
1836 | } | |
1837 | /* Use the slow path for cross page reads and writes. */ | |
1838 | ghc->memslot = NULL; | |
1839 | } | |
49c7754c GN |
1840 | return 0; |
1841 | } | |
1842 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1843 | ||
1844 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1845 | void *data, unsigned long len) | |
1846 | { | |
1847 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1848 | int r; | |
1849 | ||
8f964525 AH |
1850 | BUG_ON(len > ghc->len); |
1851 | ||
49c7754c | 1852 | if (slots->generation != ghc->generation) |
8f964525 AH |
1853 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1854 | ||
1855 | if (unlikely(!ghc->memslot)) | |
1856 | return kvm_write_guest(kvm, ghc->gpa, data, len); | |
49c7754c GN |
1857 | |
1858 | if (kvm_is_error_hva(ghc->hva)) | |
1859 | return -EFAULT; | |
1860 | ||
8b0cedff | 1861 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
49c7754c GN |
1862 | if (r) |
1863 | return -EFAULT; | |
bc009e43 | 1864 | mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT); |
49c7754c GN |
1865 | |
1866 | return 0; | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1869 | ||
e03b644f GN |
1870 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1871 | void *data, unsigned long len) | |
1872 | { | |
1873 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1874 | int r; | |
1875 | ||
8f964525 AH |
1876 | BUG_ON(len > ghc->len); |
1877 | ||
e03b644f | 1878 | if (slots->generation != ghc->generation) |
8f964525 AH |
1879 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1880 | ||
1881 | if (unlikely(!ghc->memslot)) | |
1882 | return kvm_read_guest(kvm, ghc->gpa, data, len); | |
e03b644f GN |
1883 | |
1884 | if (kvm_is_error_hva(ghc->hva)) | |
1885 | return -EFAULT; | |
1886 | ||
1887 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
1888 | if (r) | |
1889 | return -EFAULT; | |
1890 | ||
1891 | return 0; | |
1892 | } | |
1893 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
1894 | ||
195aefde IE |
1895 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1896 | { | |
8a3caa6d HC |
1897 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
1898 | ||
1899 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
1900 | } |
1901 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1902 | ||
1903 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1904 | { | |
1905 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1906 | int seg; | |
1907 | int offset = offset_in_page(gpa); | |
1908 | int ret; | |
1909 | ||
bfda0e84 | 1910 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
1911 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
1912 | if (ret < 0) | |
1913 | return ret; | |
1914 | offset = 0; | |
1915 | len -= seg; | |
1916 | ++gfn; | |
1917 | } | |
1918 | return 0; | |
1919 | } | |
1920 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1921 | ||
bc009e43 | 1922 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 1923 | gfn_t gfn) |
6aa8b732 | 1924 | { |
7e9d619d RR |
1925 | if (memslot && memslot->dirty_bitmap) { |
1926 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1927 | |
b74ca3b3 | 1928 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1929 | } |
1930 | } | |
1931 | ||
49c7754c GN |
1932 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1933 | { | |
1934 | struct kvm_memory_slot *memslot; | |
1935 | ||
1936 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 1937 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 1938 | } |
2ba9f0d8 | 1939 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 1940 | |
8e73485c PB |
1941 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
1942 | { | |
1943 | struct kvm_memory_slot *memslot; | |
1944 | ||
1945 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1946 | mark_page_dirty_in_slot(memslot, gfn); | |
1947 | } | |
1948 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
1949 | ||
aca6ff29 WL |
1950 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
1951 | { | |
2cbd7824 | 1952 | int old, val; |
aca6ff29 | 1953 | |
2cbd7824 | 1954 | old = val = vcpu->halt_poll_ns; |
aca6ff29 WL |
1955 | /* 10us base */ |
1956 | if (val == 0 && halt_poll_ns_grow) | |
1957 | val = 10000; | |
1958 | else | |
1959 | val *= halt_poll_ns_grow; | |
1960 | ||
1961 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 1962 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
1963 | } |
1964 | ||
1965 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
1966 | { | |
2cbd7824 | 1967 | int old, val; |
aca6ff29 | 1968 | |
2cbd7824 | 1969 | old = val = vcpu->halt_poll_ns; |
aca6ff29 WL |
1970 | if (halt_poll_ns_shrink == 0) |
1971 | val = 0; | |
1972 | else | |
1973 | val /= halt_poll_ns_shrink; | |
1974 | ||
1975 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 1976 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
1977 | } |
1978 | ||
f7819512 PB |
1979 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
1980 | { | |
1981 | if (kvm_arch_vcpu_runnable(vcpu)) { | |
1982 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
1983 | return -EINTR; | |
1984 | } | |
1985 | if (kvm_cpu_has_pending_timer(vcpu)) | |
1986 | return -EINTR; | |
1987 | if (signal_pending(current)) | |
1988 | return -EINTR; | |
1989 | ||
1990 | return 0; | |
1991 | } | |
1992 | ||
b6958ce4 ED |
1993 | /* |
1994 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1995 | */ | |
8776e519 | 1996 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1997 | { |
f7819512 | 1998 | ktime_t start, cur; |
e5c239cf | 1999 | DEFINE_WAIT(wait); |
f7819512 | 2000 | bool waited = false; |
aca6ff29 | 2001 | u64 block_ns; |
f7819512 PB |
2002 | |
2003 | start = cur = ktime_get(); | |
19020f8a WL |
2004 | if (vcpu->halt_poll_ns) { |
2005 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); | |
f95ef0cd | 2006 | |
62bea5bf | 2007 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2008 | do { |
2009 | /* | |
2010 | * This sets KVM_REQ_UNHALT if an interrupt | |
2011 | * arrives. | |
2012 | */ | |
2013 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2014 | ++vcpu->stat.halt_successful_poll; | |
2015 | goto out; | |
2016 | } | |
2017 | cur = ktime_get(); | |
2018 | } while (single_task_running() && ktime_before(cur, stop)); | |
2019 | } | |
e5c239cf MT |
2020 | |
2021 | for (;;) { | |
2022 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
2023 | ||
f7819512 | 2024 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2025 | break; |
2026 | ||
f7819512 | 2027 | waited = true; |
b6958ce4 | 2028 | schedule(); |
b6958ce4 | 2029 | } |
d3bef15f | 2030 | |
e5c239cf | 2031 | finish_wait(&vcpu->wq, &wait); |
f7819512 PB |
2032 | cur = ktime_get(); |
2033 | ||
2034 | out: | |
aca6ff29 WL |
2035 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2036 | ||
2037 | if (halt_poll_ns) { | |
2038 | if (block_ns <= vcpu->halt_poll_ns) | |
2039 | ; | |
2040 | /* we had a long block, shrink polling */ | |
2041 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) | |
2042 | shrink_halt_poll_ns(vcpu); | |
2043 | /* we had a short halt and our poll time is too small */ | |
2044 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2045 | block_ns < halt_poll_ns) | |
2046 | grow_halt_poll_ns(vcpu); | |
edb9272f WL |
2047 | } else |
2048 | vcpu->halt_poll_ns = 0; | |
aca6ff29 WL |
2049 | |
2050 | trace_kvm_vcpu_wakeup(block_ns, waited); | |
b6958ce4 | 2051 | } |
2ba9f0d8 | 2052 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2053 | |
8c84780d | 2054 | #ifndef CONFIG_S390 |
b6d33834 CD |
2055 | /* |
2056 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2057 | */ | |
2058 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2059 | { | |
2060 | int me; | |
2061 | int cpu = vcpu->cpu; | |
2062 | wait_queue_head_t *wqp; | |
2063 | ||
2064 | wqp = kvm_arch_vcpu_wq(vcpu); | |
2065 | if (waitqueue_active(wqp)) { | |
2066 | wake_up_interruptible(wqp); | |
2067 | ++vcpu->stat.halt_wakeup; | |
2068 | } | |
2069 | ||
2070 | me = get_cpu(); | |
2071 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2072 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2073 | smp_send_reschedule(cpu); | |
2074 | put_cpu(); | |
2075 | } | |
a20ed54d | 2076 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
8c84780d | 2077 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2078 | |
fa93384f | 2079 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2080 | { |
2081 | struct pid *pid; | |
2082 | struct task_struct *task = NULL; | |
fa93384f | 2083 | int ret = 0; |
41628d33 KW |
2084 | |
2085 | rcu_read_lock(); | |
2086 | pid = rcu_dereference(target->pid); | |
2087 | if (pid) | |
27fbe64b | 2088 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2089 | rcu_read_unlock(); |
2090 | if (!task) | |
c45c528e | 2091 | return ret; |
c45c528e | 2092 | ret = yield_to(task, 1); |
41628d33 | 2093 | put_task_struct(task); |
c45c528e R |
2094 | |
2095 | return ret; | |
41628d33 KW |
2096 | } |
2097 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2098 | ||
06e48c51 R |
2099 | /* |
2100 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2101 | * Most eligible candidate to yield is decided by following heuristics: | |
2102 | * | |
2103 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2104 | * (preempted lock holder), indicated by @in_spin_loop. | |
2105 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2106 | * | |
2107 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2108 | * chance last time (mostly it has become eligible now since we have probably | |
2109 | * yielded to lockholder in last iteration. This is done by toggling | |
2110 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2111 | * | |
2112 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2113 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2114 | * burning. Giving priority for a potential lock-holder increases lock | |
2115 | * progress. | |
2116 | * | |
2117 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2118 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2119 | * and continue with next VCPU and so on. | |
2120 | */ | |
7940876e | 2121 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2122 | { |
4a55dd72 | 2123 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2124 | bool eligible; |
2125 | ||
2126 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2127 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2128 | |
2129 | if (vcpu->spin_loop.in_spin_loop) | |
2130 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2131 | ||
2132 | return eligible; | |
4a55dd72 SW |
2133 | #else |
2134 | return true; | |
06e48c51 | 2135 | #endif |
4a55dd72 | 2136 | } |
c45c528e | 2137 | |
217ece61 | 2138 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 2139 | { |
217ece61 RR |
2140 | struct kvm *kvm = me->kvm; |
2141 | struct kvm_vcpu *vcpu; | |
2142 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2143 | int yielded = 0; | |
c45c528e | 2144 | int try = 3; |
217ece61 RR |
2145 | int pass; |
2146 | int i; | |
d255f4f2 | 2147 | |
4c088493 | 2148 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2149 | /* |
2150 | * We boost the priority of a VCPU that is runnable but not | |
2151 | * currently running, because it got preempted by something | |
2152 | * else and called schedule in __vcpu_run. Hopefully that | |
2153 | * VCPU is holding the lock that we need and will release it. | |
2154 | * We approximate round-robin by starting at the last boosted VCPU. | |
2155 | */ | |
c45c528e | 2156 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2157 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2158 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2159 | i = last_boosted_vcpu; |
2160 | continue; | |
2161 | } else if (pass && i > last_boosted_vcpu) | |
2162 | break; | |
7bc7ae25 R |
2163 | if (!ACCESS_ONCE(vcpu->preempted)) |
2164 | continue; | |
217ece61 RR |
2165 | if (vcpu == me) |
2166 | continue; | |
98f4a146 | 2167 | if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
217ece61 | 2168 | continue; |
06e48c51 R |
2169 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2170 | continue; | |
c45c528e R |
2171 | |
2172 | yielded = kvm_vcpu_yield_to(vcpu); | |
2173 | if (yielded > 0) { | |
217ece61 | 2174 | kvm->last_boosted_vcpu = i; |
217ece61 | 2175 | break; |
c45c528e R |
2176 | } else if (yielded < 0) { |
2177 | try--; | |
2178 | if (!try) | |
2179 | break; | |
217ece61 | 2180 | } |
217ece61 RR |
2181 | } |
2182 | } | |
4c088493 | 2183 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2184 | |
2185 | /* Ensure vcpu is not eligible during next spinloop */ | |
2186 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2187 | } |
2188 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2189 | ||
e4a533a4 | 2190 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
2191 | { |
2192 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
2193 | struct page *page; |
2194 | ||
e4a533a4 | 2195 | if (vmf->pgoff == 0) |
039576c0 | 2196 | page = virt_to_page(vcpu->run); |
09566765 | 2197 | #ifdef CONFIG_X86 |
e4a533a4 | 2198 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2199 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
2200 | #endif |
2201 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2202 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
2203 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2204 | #endif |
039576c0 | 2205 | else |
5b1c1493 | 2206 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2207 | get_page(page); |
e4a533a4 | 2208 | vmf->page = page; |
2209 | return 0; | |
9a2bb7f4 AK |
2210 | } |
2211 | ||
f0f37e2f | 2212 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2213 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2214 | }; |
2215 | ||
2216 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2217 | { | |
2218 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2219 | return 0; | |
2220 | } | |
2221 | ||
bccf2150 AK |
2222 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2223 | { | |
2224 | struct kvm_vcpu *vcpu = filp->private_data; | |
2225 | ||
66c0b394 | 2226 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2227 | return 0; |
2228 | } | |
2229 | ||
3d3aab1b | 2230 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2231 | .release = kvm_vcpu_release, |
2232 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
de8e5d74 | 2233 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
2234 | .compat_ioctl = kvm_vcpu_compat_ioctl, |
2235 | #endif | |
9a2bb7f4 | 2236 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2237 | .llseek = noop_llseek, |
bccf2150 AK |
2238 | }; |
2239 | ||
2240 | /* | |
2241 | * Allocates an inode for the vcpu. | |
2242 | */ | |
2243 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2244 | { | |
24009b05 | 2245 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); |
bccf2150 AK |
2246 | } |
2247 | ||
c5ea7660 AK |
2248 | /* |
2249 | * Creates some virtual cpus. Good luck creating more than one. | |
2250 | */ | |
73880c80 | 2251 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
2252 | { |
2253 | int r; | |
988a2cae | 2254 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 2255 | |
338c7dba AH |
2256 | if (id >= KVM_MAX_VCPUS) |
2257 | return -EINVAL; | |
2258 | ||
73880c80 | 2259 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
2260 | if (IS_ERR(vcpu)) |
2261 | return PTR_ERR(vcpu); | |
c5ea7660 | 2262 | |
15ad7146 AK |
2263 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
2264 | ||
26e5215f AK |
2265 | r = kvm_arch_vcpu_setup(vcpu); |
2266 | if (r) | |
d780592b | 2267 | goto vcpu_destroy; |
26e5215f | 2268 | |
11ec2804 | 2269 | mutex_lock(&kvm->lock); |
3e515705 AK |
2270 | if (!kvm_vcpu_compatible(vcpu)) { |
2271 | r = -EINVAL; | |
2272 | goto unlock_vcpu_destroy; | |
2273 | } | |
73880c80 GN |
2274 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
2275 | r = -EINVAL; | |
d780592b | 2276 | goto unlock_vcpu_destroy; |
fb3f0f51 | 2277 | } |
73880c80 | 2278 | |
988a2cae GN |
2279 | kvm_for_each_vcpu(r, v, kvm) |
2280 | if (v->vcpu_id == id) { | |
73880c80 | 2281 | r = -EEXIST; |
d780592b | 2282 | goto unlock_vcpu_destroy; |
73880c80 GN |
2283 | } |
2284 | ||
2285 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 2286 | |
fb3f0f51 | 2287 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 2288 | kvm_get_kvm(kvm); |
bccf2150 | 2289 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
2290 | if (r < 0) { |
2291 | kvm_put_kvm(kvm); | |
d780592b | 2292 | goto unlock_vcpu_destroy; |
73880c80 GN |
2293 | } |
2294 | ||
2295 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
dd489240 PB |
2296 | |
2297 | /* | |
2298 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2299 | * before kvm->online_vcpu's incremented value. | |
2300 | */ | |
73880c80 GN |
2301 | smp_wmb(); |
2302 | atomic_inc(&kvm->online_vcpus); | |
2303 | ||
73880c80 | 2304 | mutex_unlock(&kvm->lock); |
42897d86 | 2305 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2306 | return r; |
39c3b86e | 2307 | |
d780592b | 2308 | unlock_vcpu_destroy: |
7d8fece6 | 2309 | mutex_unlock(&kvm->lock); |
d780592b | 2310 | vcpu_destroy: |
d40ccc62 | 2311 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
2312 | return r; |
2313 | } | |
2314 | ||
1961d276 AK |
2315 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2316 | { | |
2317 | if (sigset) { | |
2318 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2319 | vcpu->sigset_active = 1; | |
2320 | vcpu->sigset = *sigset; | |
2321 | } else | |
2322 | vcpu->sigset_active = 0; | |
2323 | return 0; | |
2324 | } | |
2325 | ||
bccf2150 AK |
2326 | static long kvm_vcpu_ioctl(struct file *filp, |
2327 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2328 | { |
bccf2150 | 2329 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2330 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2331 | int r; |
fa3795a7 DH |
2332 | struct kvm_fpu *fpu = NULL; |
2333 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2334 | |
6d4e4c4f AK |
2335 | if (vcpu->kvm->mm != current->mm) |
2336 | return -EIO; | |
2122ff5e | 2337 | |
2ea75be3 DM |
2338 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2339 | return -EINVAL; | |
2340 | ||
2f4d9b54 | 2341 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) |
2122ff5e AK |
2342 | /* |
2343 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
2344 | * so vcpu_load() would break it. | |
2345 | */ | |
47b43c52 | 2346 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT) |
2122ff5e AK |
2347 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
2348 | #endif | |
2349 | ||
2350 | ||
9fc77441 MT |
2351 | r = vcpu_load(vcpu); |
2352 | if (r) | |
2353 | return r; | |
6aa8b732 | 2354 | switch (ioctl) { |
9a2bb7f4 | 2355 | case KVM_RUN: |
f0fe5108 AK |
2356 | r = -EINVAL; |
2357 | if (arg) | |
2358 | goto out; | |
7a72f7a1 CB |
2359 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
2360 | /* The thread running this VCPU changed. */ | |
2361 | struct pid *oldpid = vcpu->pid; | |
2362 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
f95ef0cd | 2363 | |
7a72f7a1 CB |
2364 | rcu_assign_pointer(vcpu->pid, newpid); |
2365 | if (oldpid) | |
2366 | synchronize_rcu(); | |
2367 | put_pid(oldpid); | |
2368 | } | |
b6c7a5dc | 2369 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2370 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2371 | break; |
6aa8b732 | 2372 | case KVM_GET_REGS: { |
3e4bb3ac | 2373 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2374 | |
3e4bb3ac XZ |
2375 | r = -ENOMEM; |
2376 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2377 | if (!kvm_regs) | |
6aa8b732 | 2378 | goto out; |
3e4bb3ac XZ |
2379 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2380 | if (r) | |
2381 | goto out_free1; | |
6aa8b732 | 2382 | r = -EFAULT; |
3e4bb3ac XZ |
2383 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2384 | goto out_free1; | |
6aa8b732 | 2385 | r = 0; |
3e4bb3ac XZ |
2386 | out_free1: |
2387 | kfree(kvm_regs); | |
6aa8b732 AK |
2388 | break; |
2389 | } | |
2390 | case KVM_SET_REGS: { | |
3e4bb3ac | 2391 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2392 | |
3e4bb3ac | 2393 | r = -ENOMEM; |
ff5c2c03 SL |
2394 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2395 | if (IS_ERR(kvm_regs)) { | |
2396 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2397 | goto out; |
ff5c2c03 | 2398 | } |
3e4bb3ac | 2399 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2400 | kfree(kvm_regs); |
6aa8b732 AK |
2401 | break; |
2402 | } | |
2403 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
2404 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
2405 | r = -ENOMEM; | |
2406 | if (!kvm_sregs) | |
2407 | goto out; | |
2408 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2409 | if (r) |
2410 | goto out; | |
2411 | r = -EFAULT; | |
fa3795a7 | 2412 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2413 | goto out; |
2414 | r = 0; | |
2415 | break; | |
2416 | } | |
2417 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2418 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2419 | if (IS_ERR(kvm_sregs)) { | |
2420 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2421 | kvm_sregs = NULL; |
6aa8b732 | 2422 | goto out; |
ff5c2c03 | 2423 | } |
fa3795a7 | 2424 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2425 | break; |
2426 | } | |
62d9f0db MT |
2427 | case KVM_GET_MP_STATE: { |
2428 | struct kvm_mp_state mp_state; | |
2429 | ||
2430 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2431 | if (r) | |
2432 | goto out; | |
2433 | r = -EFAULT; | |
893bdbf1 | 2434 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
2435 | goto out; |
2436 | r = 0; | |
2437 | break; | |
2438 | } | |
2439 | case KVM_SET_MP_STATE: { | |
2440 | struct kvm_mp_state mp_state; | |
2441 | ||
2442 | r = -EFAULT; | |
893bdbf1 | 2443 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
2444 | goto out; |
2445 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2446 | break; |
2447 | } | |
6aa8b732 AK |
2448 | case KVM_TRANSLATE: { |
2449 | struct kvm_translation tr; | |
2450 | ||
2451 | r = -EFAULT; | |
893bdbf1 | 2452 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 2453 | goto out; |
8b006791 | 2454 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2455 | if (r) |
2456 | goto out; | |
2457 | r = -EFAULT; | |
893bdbf1 | 2458 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
2459 | goto out; |
2460 | r = 0; | |
2461 | break; | |
2462 | } | |
d0bfb940 JK |
2463 | case KVM_SET_GUEST_DEBUG: { |
2464 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2465 | |
2466 | r = -EFAULT; | |
893bdbf1 | 2467 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 2468 | goto out; |
d0bfb940 | 2469 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2470 | break; |
2471 | } | |
1961d276 AK |
2472 | case KVM_SET_SIGNAL_MASK: { |
2473 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2474 | struct kvm_signal_mask kvm_sigmask; | |
2475 | sigset_t sigset, *p; | |
2476 | ||
2477 | p = NULL; | |
2478 | if (argp) { | |
2479 | r = -EFAULT; | |
2480 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2481 | sizeof(kvm_sigmask))) |
1961d276 AK |
2482 | goto out; |
2483 | r = -EINVAL; | |
893bdbf1 | 2484 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
2485 | goto out; |
2486 | r = -EFAULT; | |
2487 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 2488 | sizeof(sigset))) |
1961d276 AK |
2489 | goto out; |
2490 | p = &sigset; | |
2491 | } | |
376d41ff | 2492 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2493 | break; |
2494 | } | |
b8836737 | 2495 | case KVM_GET_FPU: { |
fa3795a7 DH |
2496 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
2497 | r = -ENOMEM; | |
2498 | if (!fpu) | |
2499 | goto out; | |
2500 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2501 | if (r) |
2502 | goto out; | |
2503 | r = -EFAULT; | |
fa3795a7 | 2504 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2505 | goto out; |
2506 | r = 0; | |
2507 | break; | |
2508 | } | |
2509 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2510 | fpu = memdup_user(argp, sizeof(*fpu)); |
2511 | if (IS_ERR(fpu)) { | |
2512 | r = PTR_ERR(fpu); | |
18595411 | 2513 | fpu = NULL; |
b8836737 | 2514 | goto out; |
ff5c2c03 | 2515 | } |
fa3795a7 | 2516 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2517 | break; |
2518 | } | |
bccf2150 | 2519 | default: |
313a3dc7 | 2520 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2521 | } |
2522 | out: | |
2122ff5e | 2523 | vcpu_put(vcpu); |
fa3795a7 DH |
2524 | kfree(fpu); |
2525 | kfree(kvm_sregs); | |
bccf2150 AK |
2526 | return r; |
2527 | } | |
2528 | ||
de8e5d74 | 2529 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
2530 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
2531 | unsigned int ioctl, unsigned long arg) | |
2532 | { | |
2533 | struct kvm_vcpu *vcpu = filp->private_data; | |
2534 | void __user *argp = compat_ptr(arg); | |
2535 | int r; | |
2536 | ||
2537 | if (vcpu->kvm->mm != current->mm) | |
2538 | return -EIO; | |
2539 | ||
2540 | switch (ioctl) { | |
2541 | case KVM_SET_SIGNAL_MASK: { | |
2542 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2543 | struct kvm_signal_mask kvm_sigmask; | |
2544 | compat_sigset_t csigset; | |
2545 | sigset_t sigset; | |
2546 | ||
2547 | if (argp) { | |
2548 | r = -EFAULT; | |
2549 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2550 | sizeof(kvm_sigmask))) |
1dda606c AG |
2551 | goto out; |
2552 | r = -EINVAL; | |
893bdbf1 | 2553 | if (kvm_sigmask.len != sizeof(csigset)) |
1dda606c AG |
2554 | goto out; |
2555 | r = -EFAULT; | |
2556 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
893bdbf1 | 2557 | sizeof(csigset))) |
1dda606c | 2558 | goto out; |
760a9a30 AC |
2559 | sigset_from_compat(&sigset, &csigset); |
2560 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2561 | } else | |
2562 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2563 | break; |
2564 | } | |
2565 | default: | |
2566 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2567 | } | |
2568 | ||
2569 | out: | |
2570 | return r; | |
2571 | } | |
2572 | #endif | |
2573 | ||
852b6d57 SW |
2574 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
2575 | int (*accessor)(struct kvm_device *dev, | |
2576 | struct kvm_device_attr *attr), | |
2577 | unsigned long arg) | |
2578 | { | |
2579 | struct kvm_device_attr attr; | |
2580 | ||
2581 | if (!accessor) | |
2582 | return -EPERM; | |
2583 | ||
2584 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2585 | return -EFAULT; | |
2586 | ||
2587 | return accessor(dev, &attr); | |
2588 | } | |
2589 | ||
2590 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2591 | unsigned long arg) | |
2592 | { | |
2593 | struct kvm_device *dev = filp->private_data; | |
2594 | ||
2595 | switch (ioctl) { | |
2596 | case KVM_SET_DEVICE_ATTR: | |
2597 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2598 | case KVM_GET_DEVICE_ATTR: | |
2599 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2600 | case KVM_HAS_DEVICE_ATTR: | |
2601 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2602 | default: | |
2603 | if (dev->ops->ioctl) | |
2604 | return dev->ops->ioctl(dev, ioctl, arg); | |
2605 | ||
2606 | return -ENOTTY; | |
2607 | } | |
2608 | } | |
2609 | ||
852b6d57 SW |
2610 | static int kvm_device_release(struct inode *inode, struct file *filp) |
2611 | { | |
2612 | struct kvm_device *dev = filp->private_data; | |
2613 | struct kvm *kvm = dev->kvm; | |
2614 | ||
852b6d57 SW |
2615 | kvm_put_kvm(kvm); |
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | static const struct file_operations kvm_device_fops = { | |
2620 | .unlocked_ioctl = kvm_device_ioctl, | |
de8e5d74 | 2621 | #ifdef CONFIG_KVM_COMPAT |
db6ae615 SW |
2622 | .compat_ioctl = kvm_device_ioctl, |
2623 | #endif | |
852b6d57 SW |
2624 | .release = kvm_device_release, |
2625 | }; | |
2626 | ||
2627 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2628 | { | |
2629 | if (filp->f_op != &kvm_device_fops) | |
2630 | return NULL; | |
2631 | ||
2632 | return filp->private_data; | |
2633 | } | |
2634 | ||
d60eacb0 | 2635 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 2636 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
2637 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
2638 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 2639 | #endif |
d60eacb0 | 2640 | |
5975a2e0 | 2641 | #ifdef CONFIG_KVM_XICS |
d60eacb0 | 2642 | [KVM_DEV_TYPE_XICS] = &kvm_xics_ops, |
ec53500f | 2643 | #endif |
d60eacb0 WD |
2644 | }; |
2645 | ||
2646 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2647 | { | |
2648 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2649 | return -ENOSPC; | |
2650 | ||
2651 | if (kvm_device_ops_table[type] != NULL) | |
2652 | return -EEXIST; | |
2653 | ||
2654 | kvm_device_ops_table[type] = ops; | |
2655 | return 0; | |
2656 | } | |
2657 | ||
571ee1b6 WL |
2658 | void kvm_unregister_device_ops(u32 type) |
2659 | { | |
2660 | if (kvm_device_ops_table[type] != NULL) | |
2661 | kvm_device_ops_table[type] = NULL; | |
2662 | } | |
2663 | ||
852b6d57 SW |
2664 | static int kvm_ioctl_create_device(struct kvm *kvm, |
2665 | struct kvm_create_device *cd) | |
2666 | { | |
2667 | struct kvm_device_ops *ops = NULL; | |
2668 | struct kvm_device *dev; | |
2669 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2670 | int ret; | |
2671 | ||
d60eacb0 WD |
2672 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
2673 | return -ENODEV; | |
2674 | ||
2675 | ops = kvm_device_ops_table[cd->type]; | |
2676 | if (ops == NULL) | |
852b6d57 | 2677 | return -ENODEV; |
852b6d57 SW |
2678 | |
2679 | if (test) | |
2680 | return 0; | |
2681 | ||
2682 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2683 | if (!dev) | |
2684 | return -ENOMEM; | |
2685 | ||
2686 | dev->ops = ops; | |
2687 | dev->kvm = kvm; | |
852b6d57 SW |
2688 | |
2689 | ret = ops->create(dev, cd->type); | |
2690 | if (ret < 0) { | |
2691 | kfree(dev); | |
2692 | return ret; | |
2693 | } | |
2694 | ||
24009b05 | 2695 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 SW |
2696 | if (ret < 0) { |
2697 | ops->destroy(dev); | |
2698 | return ret; | |
2699 | } | |
2700 | ||
07f0a7bd | 2701 | list_add(&dev->vm_node, &kvm->devices); |
852b6d57 SW |
2702 | kvm_get_kvm(kvm); |
2703 | cd->fd = ret; | |
2704 | return 0; | |
2705 | } | |
2706 | ||
92b591a4 AG |
2707 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
2708 | { | |
2709 | switch (arg) { | |
2710 | case KVM_CAP_USER_MEMORY: | |
2711 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
2712 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
2713 | case KVM_CAP_INTERNAL_ERROR_DATA: |
2714 | #ifdef CONFIG_HAVE_KVM_MSI | |
2715 | case KVM_CAP_SIGNAL_MSI: | |
2716 | #endif | |
297e2105 | 2717 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 2718 | case KVM_CAP_IRQFD: |
92b591a4 AG |
2719 | case KVM_CAP_IRQFD_RESAMPLE: |
2720 | #endif | |
2721 | case KVM_CAP_CHECK_EXTENSION_VM: | |
2722 | return 1; | |
2723 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
2724 | case KVM_CAP_IRQ_ROUTING: | |
2725 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
2726 | #endif |
2727 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
2728 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
2729 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 AG |
2730 | #endif |
2731 | default: | |
2732 | break; | |
2733 | } | |
2734 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
2735 | } | |
2736 | ||
bccf2150 AK |
2737 | static long kvm_vm_ioctl(struct file *filp, |
2738 | unsigned int ioctl, unsigned long arg) | |
2739 | { | |
2740 | struct kvm *kvm = filp->private_data; | |
2741 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 2742 | int r; |
bccf2150 | 2743 | |
6d4e4c4f AK |
2744 | if (kvm->mm != current->mm) |
2745 | return -EIO; | |
bccf2150 AK |
2746 | switch (ioctl) { |
2747 | case KVM_CREATE_VCPU: | |
2748 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 2749 | break; |
6fc138d2 IE |
2750 | case KVM_SET_USER_MEMORY_REGION: { |
2751 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2752 | ||
2753 | r = -EFAULT; | |
2754 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 2755 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
2756 | goto out; |
2757 | ||
47ae31e2 | 2758 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
2759 | break; |
2760 | } | |
2761 | case KVM_GET_DIRTY_LOG: { | |
2762 | struct kvm_dirty_log log; | |
2763 | ||
2764 | r = -EFAULT; | |
893bdbf1 | 2765 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 2766 | goto out; |
2c6f5df9 | 2767 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
2768 | break; |
2769 | } | |
5f94c174 LV |
2770 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2771 | case KVM_REGISTER_COALESCED_MMIO: { | |
2772 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 2773 | |
5f94c174 | 2774 | r = -EFAULT; |
893bdbf1 | 2775 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 2776 | goto out; |
5f94c174 | 2777 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2778 | break; |
2779 | } | |
2780 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2781 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 2782 | |
5f94c174 | 2783 | r = -EFAULT; |
893bdbf1 | 2784 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 2785 | goto out; |
5f94c174 | 2786 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2787 | break; |
2788 | } | |
2789 | #endif | |
721eecbf GH |
2790 | case KVM_IRQFD: { |
2791 | struct kvm_irqfd data; | |
2792 | ||
2793 | r = -EFAULT; | |
893bdbf1 | 2794 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 2795 | goto out; |
d4db2935 | 2796 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
2797 | break; |
2798 | } | |
d34e6b17 GH |
2799 | case KVM_IOEVENTFD: { |
2800 | struct kvm_ioeventfd data; | |
2801 | ||
2802 | r = -EFAULT; | |
893bdbf1 | 2803 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
2804 | goto out; |
2805 | r = kvm_ioeventfd(kvm, &data); | |
2806 | break; | |
2807 | } | |
07975ad3 JK |
2808 | #ifdef CONFIG_HAVE_KVM_MSI |
2809 | case KVM_SIGNAL_MSI: { | |
2810 | struct kvm_msi msi; | |
2811 | ||
2812 | r = -EFAULT; | |
893bdbf1 | 2813 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
2814 | goto out; |
2815 | r = kvm_send_userspace_msi(kvm, &msi); | |
2816 | break; | |
2817 | } | |
23d43cf9 CD |
2818 | #endif |
2819 | #ifdef __KVM_HAVE_IRQ_LINE | |
2820 | case KVM_IRQ_LINE_STATUS: | |
2821 | case KVM_IRQ_LINE: { | |
2822 | struct kvm_irq_level irq_event; | |
2823 | ||
2824 | r = -EFAULT; | |
893bdbf1 | 2825 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
2826 | goto out; |
2827 | ||
aa2fbe6d YZ |
2828 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
2829 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
2830 | if (r) |
2831 | goto out; | |
2832 | ||
2833 | r = -EFAULT; | |
2834 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 2835 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
2836 | goto out; |
2837 | } | |
2838 | ||
2839 | r = 0; | |
2840 | break; | |
2841 | } | |
73880c80 | 2842 | #endif |
aa8d5944 AG |
2843 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
2844 | case KVM_SET_GSI_ROUTING: { | |
2845 | struct kvm_irq_routing routing; | |
2846 | struct kvm_irq_routing __user *urouting; | |
2847 | struct kvm_irq_routing_entry *entries; | |
2848 | ||
2849 | r = -EFAULT; | |
2850 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
2851 | goto out; | |
2852 | r = -EINVAL; | |
2853 | if (routing.nr >= KVM_MAX_IRQ_ROUTES) | |
2854 | goto out; | |
2855 | if (routing.flags) | |
2856 | goto out; | |
2857 | r = -ENOMEM; | |
2858 | entries = vmalloc(routing.nr * sizeof(*entries)); | |
2859 | if (!entries) | |
2860 | goto out; | |
2861 | r = -EFAULT; | |
2862 | urouting = argp; | |
2863 | if (copy_from_user(entries, urouting->entries, | |
2864 | routing.nr * sizeof(*entries))) | |
2865 | goto out_free_irq_routing; | |
2866 | r = kvm_set_irq_routing(kvm, entries, routing.nr, | |
2867 | routing.flags); | |
a642a175 | 2868 | out_free_irq_routing: |
aa8d5944 AG |
2869 | vfree(entries); |
2870 | break; | |
2871 | } | |
2872 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
2873 | case KVM_CREATE_DEVICE: { |
2874 | struct kvm_create_device cd; | |
2875 | ||
2876 | r = -EFAULT; | |
2877 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
2878 | goto out; | |
2879 | ||
2880 | r = kvm_ioctl_create_device(kvm, &cd); | |
2881 | if (r) | |
2882 | goto out; | |
2883 | ||
2884 | r = -EFAULT; | |
2885 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
2886 | goto out; | |
2887 | ||
2888 | r = 0; | |
2889 | break; | |
2890 | } | |
92b591a4 AG |
2891 | case KVM_CHECK_EXTENSION: |
2892 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
2893 | break; | |
f17abe9a | 2894 | default: |
1fe779f8 | 2895 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
2896 | } |
2897 | out: | |
2898 | return r; | |
2899 | } | |
2900 | ||
de8e5d74 | 2901 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
2902 | struct compat_kvm_dirty_log { |
2903 | __u32 slot; | |
2904 | __u32 padding1; | |
2905 | union { | |
2906 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
2907 | __u64 padding2; | |
2908 | }; | |
2909 | }; | |
2910 | ||
2911 | static long kvm_vm_compat_ioctl(struct file *filp, | |
2912 | unsigned int ioctl, unsigned long arg) | |
2913 | { | |
2914 | struct kvm *kvm = filp->private_data; | |
2915 | int r; | |
2916 | ||
2917 | if (kvm->mm != current->mm) | |
2918 | return -EIO; | |
2919 | switch (ioctl) { | |
2920 | case KVM_GET_DIRTY_LOG: { | |
2921 | struct compat_kvm_dirty_log compat_log; | |
2922 | struct kvm_dirty_log log; | |
2923 | ||
2924 | r = -EFAULT; | |
2925 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2926 | sizeof(compat_log))) | |
2927 | goto out; | |
2928 | log.slot = compat_log.slot; | |
2929 | log.padding1 = compat_log.padding1; | |
2930 | log.padding2 = compat_log.padding2; | |
2931 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2932 | ||
2933 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
2934 | break; |
2935 | } | |
2936 | default: | |
2937 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2938 | } | |
2939 | ||
2940 | out: | |
2941 | return r; | |
2942 | } | |
2943 | #endif | |
2944 | ||
3d3aab1b | 2945 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2946 | .release = kvm_vm_release, |
2947 | .unlocked_ioctl = kvm_vm_ioctl, | |
de8e5d74 | 2948 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
2949 | .compat_ioctl = kvm_vm_compat_ioctl, |
2950 | #endif | |
6038f373 | 2951 | .llseek = noop_llseek, |
f17abe9a AK |
2952 | }; |
2953 | ||
e08b9637 | 2954 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 2955 | { |
aac87636 | 2956 | int r; |
f17abe9a AK |
2957 | struct kvm *kvm; |
2958 | ||
e08b9637 | 2959 | kvm = kvm_create_vm(type); |
d6d28168 AK |
2960 | if (IS_ERR(kvm)) |
2961 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2962 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2963 | r = kvm_coalesced_mmio_init(kvm); | |
2964 | if (r < 0) { | |
2965 | kvm_put_kvm(kvm); | |
2966 | return r; | |
2967 | } | |
2968 | #endif | |
24009b05 | 2969 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC); |
aac87636 | 2970 | if (r < 0) |
66c0b394 | 2971 | kvm_put_kvm(kvm); |
f17abe9a | 2972 | |
aac87636 | 2973 | return r; |
f17abe9a AK |
2974 | } |
2975 | ||
2976 | static long kvm_dev_ioctl(struct file *filp, | |
2977 | unsigned int ioctl, unsigned long arg) | |
2978 | { | |
07c45a36 | 2979 | long r = -EINVAL; |
f17abe9a AK |
2980 | |
2981 | switch (ioctl) { | |
2982 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2983 | if (arg) |
2984 | goto out; | |
f17abe9a AK |
2985 | r = KVM_API_VERSION; |
2986 | break; | |
2987 | case KVM_CREATE_VM: | |
e08b9637 | 2988 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 2989 | break; |
018d00d2 | 2990 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 2991 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 2992 | break; |
07c45a36 | 2993 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
2994 | if (arg) |
2995 | goto out; | |
adb1ff46 AK |
2996 | r = PAGE_SIZE; /* struct kvm_run */ |
2997 | #ifdef CONFIG_X86 | |
2998 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2999 | #endif |
3000 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
3001 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 3002 | #endif |
07c45a36 | 3003 | break; |
d4c9ff2d FEL |
3004 | case KVM_TRACE_ENABLE: |
3005 | case KVM_TRACE_PAUSE: | |
3006 | case KVM_TRACE_DISABLE: | |
2023a29c | 3007 | r = -EOPNOTSUPP; |
d4c9ff2d | 3008 | break; |
6aa8b732 | 3009 | default: |
043405e1 | 3010 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3011 | } |
3012 | out: | |
3013 | return r; | |
3014 | } | |
3015 | ||
6aa8b732 | 3016 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
3017 | .unlocked_ioctl = kvm_dev_ioctl, |
3018 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 3019 | .llseek = noop_llseek, |
6aa8b732 AK |
3020 | }; |
3021 | ||
3022 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3023 | KVM_MINOR, |
6aa8b732 AK |
3024 | "kvm", |
3025 | &kvm_chardev_ops, | |
3026 | }; | |
3027 | ||
75b7127c | 3028 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3029 | { |
3030 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3031 | int r; |
1b6c0168 | 3032 | |
7f59f492 | 3033 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3034 | return; |
10474ae8 | 3035 | |
7f59f492 | 3036 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3037 | |
13a34e06 | 3038 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3039 | |
3040 | if (r) { | |
3041 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3042 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3043 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3044 | } |
1b6c0168 AK |
3045 | } |
3046 | ||
4fa92fb2 | 3047 | static void hardware_enable(void) |
75b7127c | 3048 | { |
4a937f96 | 3049 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3050 | if (kvm_usage_count) |
3051 | hardware_enable_nolock(NULL); | |
4a937f96 | 3052 | raw_spin_unlock(&kvm_count_lock); |
75b7127c TY |
3053 | } |
3054 | ||
3055 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3056 | { |
3057 | int cpu = raw_smp_processor_id(); | |
3058 | ||
7f59f492 | 3059 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3060 | return; |
7f59f492 | 3061 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3062 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3063 | } |
3064 | ||
4fa92fb2 | 3065 | static void hardware_disable(void) |
75b7127c | 3066 | { |
4a937f96 | 3067 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3068 | if (kvm_usage_count) |
3069 | hardware_disable_nolock(NULL); | |
4a937f96 | 3070 | raw_spin_unlock(&kvm_count_lock); |
75b7127c TY |
3071 | } |
3072 | ||
10474ae8 AG |
3073 | static void hardware_disable_all_nolock(void) |
3074 | { | |
3075 | BUG_ON(!kvm_usage_count); | |
3076 | ||
3077 | kvm_usage_count--; | |
3078 | if (!kvm_usage_count) | |
75b7127c | 3079 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3080 | } |
3081 | ||
3082 | static void hardware_disable_all(void) | |
3083 | { | |
4a937f96 | 3084 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3085 | hardware_disable_all_nolock(); |
4a937f96 | 3086 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3087 | } |
3088 | ||
3089 | static int hardware_enable_all(void) | |
3090 | { | |
3091 | int r = 0; | |
3092 | ||
4a937f96 | 3093 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3094 | |
3095 | kvm_usage_count++; | |
3096 | if (kvm_usage_count == 1) { | |
3097 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3098 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3099 | |
3100 | if (atomic_read(&hardware_enable_failed)) { | |
3101 | hardware_disable_all_nolock(); | |
3102 | r = -EBUSY; | |
3103 | } | |
3104 | } | |
3105 | ||
4a937f96 | 3106 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3107 | |
3108 | return r; | |
3109 | } | |
3110 | ||
774c47f1 AK |
3111 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
3112 | void *v) | |
3113 | { | |
1a6f4d7f | 3114 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 3115 | switch (val) { |
cec9ad27 | 3116 | case CPU_DYING: |
4fa92fb2 | 3117 | hardware_disable(); |
6ec8a856 | 3118 | break; |
da908f2f | 3119 | case CPU_STARTING: |
4fa92fb2 | 3120 | hardware_enable(); |
774c47f1 AK |
3121 | break; |
3122 | } | |
3123 | return NOTIFY_OK; | |
3124 | } | |
3125 | ||
9a2b85c6 | 3126 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 3127 | void *v) |
9a2b85c6 | 3128 | { |
8e1c1815 SY |
3129 | /* |
3130 | * Some (well, at least mine) BIOSes hang on reboot if | |
3131 | * in vmx root mode. | |
3132 | * | |
3133 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3134 | */ | |
1170adc6 | 3135 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 3136 | kvm_rebooting = true; |
75b7127c | 3137 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
3138 | return NOTIFY_OK; |
3139 | } | |
3140 | ||
3141 | static struct notifier_block kvm_reboot_notifier = { | |
3142 | .notifier_call = kvm_reboot, | |
3143 | .priority = 0, | |
3144 | }; | |
3145 | ||
e93f8a0f | 3146 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
3147 | { |
3148 | int i; | |
3149 | ||
3150 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 3151 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
3152 | |
3153 | kvm_iodevice_destructor(pos); | |
3154 | } | |
e93f8a0f | 3155 | kfree(bus); |
2eeb2e94 GH |
3156 | } |
3157 | ||
c21fbff1 | 3158 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 3159 | const struct kvm_io_range *r2) |
743eeb0b | 3160 | { |
8f4216c7 JW |
3161 | gpa_t addr1 = r1->addr; |
3162 | gpa_t addr2 = r2->addr; | |
3163 | ||
3164 | if (addr1 < addr2) | |
743eeb0b | 3165 | return -1; |
8f4216c7 JW |
3166 | |
3167 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3168 | * accept any overlapping write. Any order is acceptable for | |
3169 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3170 | * we process all of them. | |
3171 | */ | |
3172 | if (r2->len) { | |
3173 | addr1 += r1->len; | |
3174 | addr2 += r2->len; | |
3175 | } | |
3176 | ||
3177 | if (addr1 > addr2) | |
743eeb0b | 3178 | return 1; |
8f4216c7 | 3179 | |
743eeb0b SL |
3180 | return 0; |
3181 | } | |
3182 | ||
a343c9b7 PB |
3183 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
3184 | { | |
c21fbff1 | 3185 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
3186 | } |
3187 | ||
39369f7a | 3188 | static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, |
743eeb0b SL |
3189 | gpa_t addr, int len) |
3190 | { | |
743eeb0b SL |
3191 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
3192 | .addr = addr, | |
3193 | .len = len, | |
3194 | .dev = dev, | |
3195 | }; | |
3196 | ||
3197 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
3198 | kvm_io_bus_sort_cmp, NULL); | |
3199 | ||
3200 | return 0; | |
3201 | } | |
3202 | ||
39369f7a | 3203 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
3204 | gpa_t addr, int len) |
3205 | { | |
3206 | struct kvm_io_range *range, key; | |
3207 | int off; | |
3208 | ||
3209 | key = (struct kvm_io_range) { | |
3210 | .addr = addr, | |
3211 | .len = len, | |
3212 | }; | |
3213 | ||
3214 | range = bsearch(&key, bus->range, bus->dev_count, | |
3215 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3216 | if (range == NULL) | |
3217 | return -ENOENT; | |
3218 | ||
3219 | off = range - bus->range; | |
3220 | ||
c21fbff1 | 3221 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
3222 | off--; |
3223 | ||
3224 | return off; | |
3225 | } | |
3226 | ||
e32edf4f | 3227 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
3228 | struct kvm_io_range *range, const void *val) |
3229 | { | |
3230 | int idx; | |
3231 | ||
3232 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3233 | if (idx < 0) | |
3234 | return -EOPNOTSUPP; | |
3235 | ||
3236 | while (idx < bus->dev_count && | |
c21fbff1 | 3237 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3238 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3239 | range->len, val)) |
3240 | return idx; | |
3241 | idx++; | |
3242 | } | |
3243 | ||
3244 | return -EOPNOTSUPP; | |
3245 | } | |
3246 | ||
bda9020e | 3247 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 3248 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 3249 | int len, const void *val) |
2eeb2e94 | 3250 | { |
90d83dc3 | 3251 | struct kvm_io_bus *bus; |
743eeb0b | 3252 | struct kvm_io_range range; |
126a5af5 | 3253 | int r; |
743eeb0b SL |
3254 | |
3255 | range = (struct kvm_io_range) { | |
3256 | .addr = addr, | |
3257 | .len = len, | |
3258 | }; | |
90d83dc3 | 3259 | |
e32edf4f NN |
3260 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
3261 | r = __kvm_io_bus_write(vcpu, bus, &range, val); | |
126a5af5 CH |
3262 | return r < 0 ? r : 0; |
3263 | } | |
3264 | ||
3265 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
3266 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
3267 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
3268 | { |
3269 | struct kvm_io_bus *bus; | |
3270 | struct kvm_io_range range; | |
3271 | ||
3272 | range = (struct kvm_io_range) { | |
3273 | .addr = addr, | |
3274 | .len = len, | |
3275 | }; | |
3276 | ||
e32edf4f | 3277 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
126a5af5 CH |
3278 | |
3279 | /* First try the device referenced by cookie. */ | |
3280 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 3281 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 3282 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
3283 | val)) |
3284 | return cookie; | |
3285 | ||
3286 | /* | |
3287 | * cookie contained garbage; fall back to search and return the | |
3288 | * correct cookie value. | |
3289 | */ | |
e32edf4f | 3290 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3291 | } |
3292 | ||
e32edf4f NN |
3293 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
3294 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
3295 | { |
3296 | int idx; | |
3297 | ||
3298 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
3299 | if (idx < 0) |
3300 | return -EOPNOTSUPP; | |
3301 | ||
3302 | while (idx < bus->dev_count && | |
c21fbff1 | 3303 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3304 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3305 | range->len, val)) |
3306 | return idx; | |
743eeb0b SL |
3307 | idx++; |
3308 | } | |
3309 | ||
bda9020e MT |
3310 | return -EOPNOTSUPP; |
3311 | } | |
68c3b4d1 | 3312 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
2eeb2e94 | 3313 | |
bda9020e | 3314 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 3315 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 3316 | int len, void *val) |
bda9020e | 3317 | { |
90d83dc3 | 3318 | struct kvm_io_bus *bus; |
743eeb0b | 3319 | struct kvm_io_range range; |
126a5af5 | 3320 | int r; |
743eeb0b SL |
3321 | |
3322 | range = (struct kvm_io_range) { | |
3323 | .addr = addr, | |
3324 | .len = len, | |
3325 | }; | |
e93f8a0f | 3326 | |
e32edf4f NN |
3327 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
3328 | r = __kvm_io_bus_read(vcpu, bus, &range, val); | |
126a5af5 CH |
3329 | return r < 0 ? r : 0; |
3330 | } | |
743eeb0b | 3331 | |
2eeb2e94 | 3332 | |
79fac95e | 3333 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3334 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3335 | int len, struct kvm_io_device *dev) | |
6c474694 | 3336 | { |
e93f8a0f | 3337 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3338 | |
e93f8a0f | 3339 | bus = kvm->buses[bus_idx]; |
6ea34c9b AK |
3340 | /* exclude ioeventfd which is limited by maximum fd */ |
3341 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3342 | return -ENOSPC; |
2eeb2e94 | 3343 | |
a1300716 AK |
3344 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
3345 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
e93f8a0f MT |
3346 | if (!new_bus) |
3347 | return -ENOMEM; | |
a1300716 AK |
3348 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
3349 | sizeof(struct kvm_io_range))); | |
743eeb0b | 3350 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
e93f8a0f MT |
3351 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3352 | synchronize_srcu_expedited(&kvm->srcu); | |
3353 | kfree(bus); | |
090b7aff GH |
3354 | |
3355 | return 0; | |
3356 | } | |
3357 | ||
79fac95e | 3358 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
3359 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3360 | struct kvm_io_device *dev) | |
090b7aff | 3361 | { |
e93f8a0f MT |
3362 | int i, r; |
3363 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 3364 | |
cdfca7b3 | 3365 | bus = kvm->buses[bus_idx]; |
e93f8a0f | 3366 | r = -ENOENT; |
a1300716 AK |
3367 | for (i = 0; i < bus->dev_count; i++) |
3368 | if (bus->range[i].dev == dev) { | |
e93f8a0f | 3369 | r = 0; |
090b7aff GH |
3370 | break; |
3371 | } | |
e93f8a0f | 3372 | |
a1300716 | 3373 | if (r) |
e93f8a0f | 3374 | return r; |
a1300716 AK |
3375 | |
3376 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
3377 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3378 | if (!new_bus) | |
3379 | return -ENOMEM; | |
3380 | ||
3381 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3382 | new_bus->dev_count--; | |
3383 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3384 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3385 | |
3386 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3387 | synchronize_srcu_expedited(&kvm->srcu); | |
3388 | kfree(bus); | |
3389 | return r; | |
2eeb2e94 GH |
3390 | } |
3391 | ||
774c47f1 AK |
3392 | static struct notifier_block kvm_cpu_notifier = { |
3393 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
3394 | }; |
3395 | ||
8b88b099 | 3396 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
3397 | { |
3398 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
3399 | struct kvm *kvm; |
3400 | ||
8b88b099 | 3401 | *val = 0; |
2f303b74 | 3402 | spin_lock(&kvm_lock); |
ba1389b7 | 3403 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 3404 | *val += *(u32 *)((void *)kvm + offset); |
2f303b74 | 3405 | spin_unlock(&kvm_lock); |
8b88b099 | 3406 | return 0; |
ba1389b7 AK |
3407 | } |
3408 | ||
3409 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
3410 | ||
8b88b099 | 3411 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
3412 | { |
3413 | unsigned offset = (long)_offset; | |
1165f5fe AK |
3414 | struct kvm *kvm; |
3415 | struct kvm_vcpu *vcpu; | |
3416 | int i; | |
3417 | ||
8b88b099 | 3418 | *val = 0; |
2f303b74 | 3419 | spin_lock(&kvm_lock); |
1165f5fe | 3420 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
3421 | kvm_for_each_vcpu(i, vcpu, kvm) |
3422 | *val += *(u32 *)((void *)vcpu + offset); | |
3423 | ||
2f303b74 | 3424 | spin_unlock(&kvm_lock); |
8b88b099 | 3425 | return 0; |
1165f5fe AK |
3426 | } |
3427 | ||
ba1389b7 AK |
3428 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
3429 | ||
828c0950 | 3430 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
3431 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
3432 | [KVM_STAT_VM] = &vm_stat_fops, | |
3433 | }; | |
1165f5fe | 3434 | |
4f69b680 | 3435 | static int kvm_init_debug(void) |
6aa8b732 | 3436 | { |
0c8eb04a | 3437 | int r = -EEXIST; |
6aa8b732 AK |
3438 | struct kvm_stats_debugfs_item *p; |
3439 | ||
76f7c879 | 3440 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 H |
3441 | if (kvm_debugfs_dir == NULL) |
3442 | goto out; | |
3443 | ||
3444 | for (p = debugfs_entries; p->name; ++p) { | |
76f7c879 | 3445 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 3446 | (void *)(long)p->offset, |
ba1389b7 | 3447 | stat_fops[p->kind]); |
4f69b680 H |
3448 | if (p->dentry == NULL) |
3449 | goto out_dir; | |
3450 | } | |
3451 | ||
3452 | return 0; | |
3453 | ||
3454 | out_dir: | |
3455 | debugfs_remove_recursive(kvm_debugfs_dir); | |
3456 | out: | |
3457 | return r; | |
6aa8b732 AK |
3458 | } |
3459 | ||
3460 | static void kvm_exit_debug(void) | |
3461 | { | |
3462 | struct kvm_stats_debugfs_item *p; | |
3463 | ||
3464 | for (p = debugfs_entries; p->name; ++p) | |
3465 | debugfs_remove(p->dentry); | |
76f7c879 | 3466 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
3467 | } |
3468 | ||
fb3600cc | 3469 | static int kvm_suspend(void) |
59ae6c6b | 3470 | { |
10474ae8 | 3471 | if (kvm_usage_count) |
75b7127c | 3472 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
3473 | return 0; |
3474 | } | |
3475 | ||
fb3600cc | 3476 | static void kvm_resume(void) |
59ae6c6b | 3477 | { |
ca84d1a2 | 3478 | if (kvm_usage_count) { |
4a937f96 | 3479 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
75b7127c | 3480 | hardware_enable_nolock(NULL); |
ca84d1a2 | 3481 | } |
59ae6c6b AK |
3482 | } |
3483 | ||
fb3600cc | 3484 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
3485 | .suspend = kvm_suspend, |
3486 | .resume = kvm_resume, | |
3487 | }; | |
3488 | ||
15ad7146 AK |
3489 | static inline |
3490 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
3491 | { | |
3492 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
3493 | } | |
3494 | ||
3495 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
3496 | { | |
3497 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 3498 | |
3a08a8f9 R |
3499 | if (vcpu->preempted) |
3500 | vcpu->preempted = false; | |
15ad7146 | 3501 | |
e790d9ef RK |
3502 | kvm_arch_sched_in(vcpu, cpu); |
3503 | ||
e9b11c17 | 3504 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
3505 | } |
3506 | ||
3507 | static void kvm_sched_out(struct preempt_notifier *pn, | |
3508 | struct task_struct *next) | |
3509 | { | |
3510 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3511 | ||
3a08a8f9 R |
3512 | if (current->state == TASK_RUNNING) |
3513 | vcpu->preempted = true; | |
e9b11c17 | 3514 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
3515 | } |
3516 | ||
0ee75bea | 3517 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 3518 | struct module *module) |
6aa8b732 AK |
3519 | { |
3520 | int r; | |
002c7f7c | 3521 | int cpu; |
6aa8b732 | 3522 | |
f8c16bba ZX |
3523 | r = kvm_arch_init(opaque); |
3524 | if (r) | |
d2308784 | 3525 | goto out_fail; |
cb498ea2 | 3526 | |
7dac16c3 AH |
3527 | /* |
3528 | * kvm_arch_init makes sure there's at most one caller | |
3529 | * for architectures that support multiple implementations, | |
3530 | * like intel and amd on x86. | |
3531 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating | |
3532 | * conflicts in case kvm is already setup for another implementation. | |
3533 | */ | |
3534 | r = kvm_irqfd_init(); | |
3535 | if (r) | |
3536 | goto out_irqfd; | |
3537 | ||
8437a617 | 3538 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
3539 | r = -ENOMEM; |
3540 | goto out_free_0; | |
3541 | } | |
3542 | ||
e9b11c17 | 3543 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 3544 | if (r < 0) |
7f59f492 | 3545 | goto out_free_0a; |
6aa8b732 | 3546 | |
002c7f7c YS |
3547 | for_each_online_cpu(cpu) { |
3548 | smp_call_function_single(cpu, | |
e9b11c17 | 3549 | kvm_arch_check_processor_compat, |
8691e5a8 | 3550 | &r, 1); |
002c7f7c | 3551 | if (r < 0) |
d2308784 | 3552 | goto out_free_1; |
002c7f7c YS |
3553 | } |
3554 | ||
774c47f1 AK |
3555 | r = register_cpu_notifier(&kvm_cpu_notifier); |
3556 | if (r) | |
d2308784 | 3557 | goto out_free_2; |
6aa8b732 AK |
3558 | register_reboot_notifier(&kvm_reboot_notifier); |
3559 | ||
c16f862d | 3560 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
3561 | if (!vcpu_align) |
3562 | vcpu_align = __alignof__(struct kvm_vcpu); | |
3563 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 3564 | 0, NULL); |
c16f862d RR |
3565 | if (!kvm_vcpu_cache) { |
3566 | r = -ENOMEM; | |
fb3600cc | 3567 | goto out_free_3; |
c16f862d RR |
3568 | } |
3569 | ||
af585b92 GN |
3570 | r = kvm_async_pf_init(); |
3571 | if (r) | |
3572 | goto out_free; | |
3573 | ||
6aa8b732 | 3574 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
3575 | kvm_vm_fops.owner = module; |
3576 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
3577 | |
3578 | r = misc_register(&kvm_dev); | |
3579 | if (r) { | |
1170adc6 | 3580 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 3581 | goto out_unreg; |
6aa8b732 AK |
3582 | } |
3583 | ||
fb3600cc RW |
3584 | register_syscore_ops(&kvm_syscore_ops); |
3585 | ||
15ad7146 AK |
3586 | kvm_preempt_ops.sched_in = kvm_sched_in; |
3587 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
3588 | ||
4f69b680 H |
3589 | r = kvm_init_debug(); |
3590 | if (r) { | |
1170adc6 | 3591 | pr_err("kvm: create debugfs files failed\n"); |
4f69b680 H |
3592 | goto out_undebugfs; |
3593 | } | |
0ea4ed8e | 3594 | |
3c3c29fd PB |
3595 | r = kvm_vfio_ops_init(); |
3596 | WARN_ON(r); | |
3597 | ||
c7addb90 | 3598 | return 0; |
6aa8b732 | 3599 | |
4f69b680 H |
3600 | out_undebugfs: |
3601 | unregister_syscore_ops(&kvm_syscore_ops); | |
afc2f792 | 3602 | misc_deregister(&kvm_dev); |
af585b92 GN |
3603 | out_unreg: |
3604 | kvm_async_pf_deinit(); | |
6aa8b732 | 3605 | out_free: |
c16f862d | 3606 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 3607 | out_free_3: |
6aa8b732 | 3608 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 3609 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 3610 | out_free_2: |
d2308784 | 3611 | out_free_1: |
e9b11c17 | 3612 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
3613 | out_free_0a: |
3614 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 3615 | out_free_0: |
a0f155e9 CH |
3616 | kvm_irqfd_exit(); |
3617 | out_irqfd: | |
7dac16c3 AH |
3618 | kvm_arch_exit(); |
3619 | out_fail: | |
6aa8b732 AK |
3620 | return r; |
3621 | } | |
cb498ea2 | 3622 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 3623 | |
cb498ea2 | 3624 | void kvm_exit(void) |
6aa8b732 | 3625 | { |
0ea4ed8e | 3626 | kvm_exit_debug(); |
6aa8b732 | 3627 | misc_deregister(&kvm_dev); |
c16f862d | 3628 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 3629 | kvm_async_pf_deinit(); |
fb3600cc | 3630 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 3631 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 3632 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 3633 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 3634 | kvm_arch_hardware_unsetup(); |
f8c16bba | 3635 | kvm_arch_exit(); |
a0f155e9 | 3636 | kvm_irqfd_exit(); |
7f59f492 | 3637 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 3638 | kvm_vfio_ops_exit(); |
6aa8b732 | 3639 | } |
cb498ea2 | 3640 | EXPORT_SYMBOL_GPL(kvm_exit); |