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> |
174cd4b1 | 35 | #include <linux/sched/signal.h> |
6e84f315 | 36 | #include <linux/sched/mm.h> |
03441a34 | 37 | #include <linux/sched/stat.h> |
d9e368d6 AK |
38 | #include <linux/cpumask.h> |
39 | #include <linux/smp.h> | |
d6d28168 | 40 | #include <linux/anon_inodes.h> |
04d2cc77 | 41 | #include <linux/profile.h> |
7aa81cc0 | 42 | #include <linux/kvm_para.h> |
6fc138d2 | 43 | #include <linux/pagemap.h> |
8d4e1288 | 44 | #include <linux/mman.h> |
35149e21 | 45 | #include <linux/swap.h> |
e56d532f | 46 | #include <linux/bitops.h> |
547de29e | 47 | #include <linux/spinlock.h> |
6ff5894c | 48 | #include <linux/compat.h> |
bc6678a3 | 49 | #include <linux/srcu.h> |
8f0b1ab6 | 50 | #include <linux/hugetlb.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
743eeb0b SL |
52 | #include <linux/sort.h> |
53 | #include <linux/bsearch.h> | |
6aa8b732 | 54 | |
e495606d | 55 | #include <asm/processor.h> |
e495606d | 56 | #include <asm/io.h> |
2ea75be3 | 57 | #include <asm/ioctl.h> |
7c0f6ba6 | 58 | #include <linux/uaccess.h> |
3e021bf5 | 59 | #include <asm/pgtable.h> |
6aa8b732 | 60 | |
5f94c174 | 61 | #include "coalesced_mmio.h" |
af585b92 | 62 | #include "async_pf.h" |
3c3c29fd | 63 | #include "vfio.h" |
5f94c174 | 64 | |
229456fc MT |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/kvm.h> | |
67 | ||
536a6f88 JF |
68 | /* Worst case buffer size needed for holding an integer. */ |
69 | #define ITOA_MAX_LEN 12 | |
70 | ||
6aa8b732 AK |
71 | MODULE_AUTHOR("Qumranet"); |
72 | MODULE_LICENSE("GPL"); | |
73 | ||
920552b2 | 74 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 75 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 76 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 77 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 78 | |
aca6ff29 | 79 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 80 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 81 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 82 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 WL |
83 | |
84 | /* Default resets per-vcpu halt_poll_ns . */ | |
ec76d819 | 85 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 86 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 87 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 88 | |
fa40a821 MT |
89 | /* |
90 | * Ordering of locks: | |
91 | * | |
b7d409de | 92 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
93 | */ |
94 | ||
2f303b74 | 95 | DEFINE_SPINLOCK(kvm_lock); |
4a937f96 | 96 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 97 | LIST_HEAD(vm_list); |
133de902 | 98 | |
7f59f492 | 99 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 100 | static int kvm_usage_count; |
10474ae8 | 101 | static atomic_t hardware_enable_failed; |
1b6c0168 | 102 | |
c16f862d RR |
103 | struct kmem_cache *kvm_vcpu_cache; |
104 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 105 | |
15ad7146 AK |
106 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
107 | ||
76f7c879 | 108 | struct dentry *kvm_debugfs_dir; |
e23a808b | 109 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 110 | |
536a6f88 JF |
111 | static int kvm_debugfs_num_entries; |
112 | static const struct file_operations *stat_fops_per_vm[]; | |
113 | ||
bccf2150 AK |
114 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
115 | unsigned long arg); | |
de8e5d74 | 116 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
117 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
118 | unsigned long arg); | |
7ddfd3e0 MZ |
119 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
120 | #else | |
121 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, | |
122 | unsigned long arg) { return -EINVAL; } | |
123 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl | |
1dda606c | 124 | #endif |
10474ae8 AG |
125 | static int hardware_enable_all(void); |
126 | static void hardware_disable_all(void); | |
bccf2150 | 127 | |
e93f8a0f | 128 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 129 | |
bc009e43 | 130 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 131 | |
52480137 | 132 | __visible bool kvm_rebooting; |
b7c4145b | 133 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 134 | |
54dee993 MT |
135 | static bool largepages_enabled = true; |
136 | ||
286de8f6 CI |
137 | #define KVM_EVENT_CREATE_VM 0 |
138 | #define KVM_EVENT_DESTROY_VM 1 | |
139 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
140 | static unsigned long long kvm_createvm_count; | |
141 | static unsigned long long kvm_active_vms; | |
142 | ||
93065ac7 MH |
143 | __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
144 | unsigned long start, unsigned long end, bool blockable) | |
b1394e74 | 145 | { |
93065ac7 | 146 | return 0; |
b1394e74 RK |
147 | } |
148 | ||
ba049e93 | 149 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
cbff90a7 | 150 | { |
11feeb49 | 151 | if (pfn_valid(pfn)) |
bf4bea8e | 152 | return PageReserved(pfn_to_page(pfn)); |
cbff90a7 BAY |
153 | |
154 | return true; | |
155 | } | |
156 | ||
bccf2150 AK |
157 | /* |
158 | * Switches to specified vcpu, until a matching vcpu_put() | |
159 | */ | |
ec7660cc | 160 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 161 | { |
ec7660cc | 162 | int cpu = get_cpu(); |
15ad7146 | 163 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 164 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 165 | put_cpu(); |
6aa8b732 | 166 | } |
2f1fe811 | 167 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 168 | |
313a3dc7 | 169 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 170 | { |
15ad7146 | 171 | preempt_disable(); |
313a3dc7 | 172 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
173 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
174 | preempt_enable(); | |
6aa8b732 | 175 | } |
2f1fe811 | 176 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 177 | |
7a97cec2 PB |
178 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
179 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
180 | { | |
181 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
182 | ||
183 | /* | |
184 | * We need to wait for the VCPU to reenable interrupts and get out of | |
185 | * READING_SHADOW_PAGE_TABLES mode. | |
186 | */ | |
187 | if (req & KVM_REQUEST_WAIT) | |
188 | return mode != OUTSIDE_GUEST_MODE; | |
189 | ||
190 | /* | |
191 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
192 | */ | |
193 | return mode == IN_GUEST_MODE; | |
194 | } | |
195 | ||
d9e368d6 AK |
196 | static void ack_flush(void *_completed) |
197 | { | |
d9e368d6 AK |
198 | } |
199 | ||
b49defe8 PB |
200 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) |
201 | { | |
202 | if (unlikely(!cpus)) | |
203 | cpus = cpu_online_mask; | |
204 | ||
205 | if (cpumask_empty(cpus)) | |
206 | return false; | |
207 | ||
208 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
209 | return true; | |
210 | } | |
211 | ||
7053df4e VK |
212 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
213 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) | |
d9e368d6 | 214 | { |
597a5f55 | 215 | int i, cpu, me; |
d9e368d6 | 216 | struct kvm_vcpu *vcpu; |
7053df4e | 217 | bool called; |
6ef7a1bc | 218 | |
3cba4130 | 219 | me = get_cpu(); |
7053df4e | 220 | |
988a2cae | 221 | kvm_for_each_vcpu(i, vcpu, kvm) { |
a812297c | 222 | if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) |
7053df4e VK |
223 | continue; |
224 | ||
3cba4130 | 225 | kvm_make_request(req, vcpu); |
d9e368d6 | 226 | cpu = vcpu->cpu; |
6b7e2d09 | 227 | |
178f02ff RK |
228 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) |
229 | continue; | |
6c6e8360 | 230 | |
7053df4e | 231 | if (tmp != NULL && cpu != -1 && cpu != me && |
7a97cec2 | 232 | kvm_request_needs_ipi(vcpu, req)) |
7053df4e | 233 | __cpumask_set_cpu(cpu, tmp); |
49846896 | 234 | } |
7053df4e VK |
235 | |
236 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 237 | put_cpu(); |
7053df4e VK |
238 | |
239 | return called; | |
240 | } | |
241 | ||
242 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
243 | { | |
244 | cpumask_var_t cpus; | |
245 | bool called; | |
7053df4e VK |
246 | |
247 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
248 | ||
a812297c | 249 | called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus); |
7053df4e | 250 | |
6ef7a1bc | 251 | free_cpumask_var(cpus); |
49846896 | 252 | return called; |
d9e368d6 AK |
253 | } |
254 | ||
a6d51016 | 255 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 256 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 257 | { |
4ae3cb3a LT |
258 | /* |
259 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
260 | * kvm_make_all_cpus_request. | |
261 | */ | |
262 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
263 | ||
264 | /* | |
265 | * We want to publish modifications to the page tables before reading | |
266 | * mode. Pairs with a memory barrier in arch-specific code. | |
267 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
268 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
269 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
270 | * | |
271 | * There is already an smp_mb__after_atomic() before | |
272 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
273 | * barrier here. | |
274 | */ | |
b08660e5 TL |
275 | if (!kvm_arch_flush_remote_tlb(kvm) |
276 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
49846896 | 277 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 278 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 279 | } |
2ba9f0d8 | 280 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 281 | #endif |
2e53d63a | 282 | |
49846896 RR |
283 | void kvm_reload_remote_mmus(struct kvm *kvm) |
284 | { | |
445b8236 | 285 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 286 | } |
2e53d63a | 287 | |
fb3f0f51 RR |
288 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
289 | { | |
290 | struct page *page; | |
291 | int r; | |
292 | ||
293 | mutex_init(&vcpu->mutex); | |
294 | vcpu->cpu = -1; | |
fb3f0f51 RR |
295 | vcpu->kvm = kvm; |
296 | vcpu->vcpu_id = id; | |
34bb10b7 | 297 | vcpu->pid = NULL; |
8577370f | 298 | init_swait_queue_head(&vcpu->wq); |
af585b92 | 299 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 300 | |
bf9f6ac8 FW |
301 | vcpu->pre_pcpu = -1; |
302 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
303 | ||
fb3f0f51 RR |
304 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
305 | if (!page) { | |
306 | r = -ENOMEM; | |
307 | goto fail; | |
308 | } | |
309 | vcpu->run = page_address(page); | |
310 | ||
4c088493 R |
311 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
312 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 313 | vcpu->preempted = false; |
4c088493 | 314 | |
e9b11c17 | 315 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 316 | if (r < 0) |
e9b11c17 | 317 | goto fail_free_run; |
fb3f0f51 RR |
318 | return 0; |
319 | ||
fb3f0f51 RR |
320 | fail_free_run: |
321 | free_page((unsigned long)vcpu->run); | |
322 | fail: | |
76fafa5e | 323 | return r; |
fb3f0f51 RR |
324 | } |
325 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
326 | ||
327 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
328 | { | |
0e4524a5 CB |
329 | /* |
330 | * no need for rcu_read_lock as VCPU_RUN is the only place that | |
331 | * will change the vcpu->pid pointer and on uninit all file | |
332 | * descriptors are already gone. | |
333 | */ | |
334 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
e9b11c17 | 335 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
336 | free_page((unsigned long)vcpu->run); |
337 | } | |
338 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
339 | ||
e930bffe AA |
340 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
341 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
342 | { | |
343 | return container_of(mn, struct kvm, mmu_notifier); | |
344 | } | |
345 | ||
3da0dd43 IE |
346 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
347 | struct mm_struct *mm, | |
348 | unsigned long address, | |
349 | pte_t pte) | |
350 | { | |
351 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 352 | int idx; |
3da0dd43 | 353 | |
bc6678a3 | 354 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
355 | spin_lock(&kvm->mmu_lock); |
356 | kvm->mmu_notifier_seq++; | |
357 | kvm_set_spte_hva(kvm, address, pte); | |
358 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 359 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
360 | } |
361 | ||
93065ac7 | 362 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
e930bffe AA |
363 | struct mm_struct *mm, |
364 | unsigned long start, | |
93065ac7 MH |
365 | unsigned long end, |
366 | bool blockable) | |
e930bffe AA |
367 | { |
368 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 369 | int need_tlb_flush = 0, idx; |
93065ac7 | 370 | int ret; |
e930bffe | 371 | |
bc6678a3 | 372 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
373 | spin_lock(&kvm->mmu_lock); |
374 | /* | |
375 | * The count increase must become visible at unlock time as no | |
376 | * spte can be established without taking the mmu_lock and | |
377 | * count is also read inside the mmu_lock critical section. | |
378 | */ | |
379 | kvm->mmu_notifier_count++; | |
b3ae2096 | 380 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
a4ee1ca4 | 381 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
382 | /* we've to flush the tlb before the pages can be freed */ |
383 | if (need_tlb_flush) | |
384 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
385 | |
386 | spin_unlock(&kvm->mmu_lock); | |
b1394e74 | 387 | |
93065ac7 | 388 | ret = kvm_arch_mmu_notifier_invalidate_range(kvm, start, end, blockable); |
b1394e74 | 389 | |
565f3be2 | 390 | srcu_read_unlock(&kvm->srcu, idx); |
93065ac7 MH |
391 | |
392 | return ret; | |
e930bffe AA |
393 | } |
394 | ||
395 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
396 | struct mm_struct *mm, | |
397 | unsigned long start, | |
398 | unsigned long end) | |
399 | { | |
400 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
401 | ||
402 | spin_lock(&kvm->mmu_lock); | |
403 | /* | |
404 | * This sequence increase will notify the kvm page fault that | |
405 | * the page that is going to be mapped in the spte could have | |
406 | * been freed. | |
407 | */ | |
408 | kvm->mmu_notifier_seq++; | |
a355aa54 | 409 | smp_wmb(); |
e930bffe AA |
410 | /* |
411 | * The above sequence increase must be visible before the | |
a355aa54 PM |
412 | * below count decrease, which is ensured by the smp_wmb above |
413 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
414 | */ |
415 | kvm->mmu_notifier_count--; | |
416 | spin_unlock(&kvm->mmu_lock); | |
417 | ||
418 | BUG_ON(kvm->mmu_notifier_count < 0); | |
419 | } | |
420 | ||
421 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
422 | struct mm_struct *mm, | |
57128468 ALC |
423 | unsigned long start, |
424 | unsigned long end) | |
e930bffe AA |
425 | { |
426 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 427 | int young, idx; |
e930bffe | 428 | |
bc6678a3 | 429 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 430 | spin_lock(&kvm->mmu_lock); |
e930bffe | 431 | |
57128468 | 432 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
433 | if (young) |
434 | kvm_flush_remote_tlbs(kvm); | |
435 | ||
565f3be2 TY |
436 | spin_unlock(&kvm->mmu_lock); |
437 | srcu_read_unlock(&kvm->srcu, idx); | |
438 | ||
e930bffe AA |
439 | return young; |
440 | } | |
441 | ||
1d7715c6 VD |
442 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
443 | struct mm_struct *mm, | |
444 | unsigned long start, | |
445 | unsigned long end) | |
446 | { | |
447 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
448 | int young, idx; | |
449 | ||
450 | idx = srcu_read_lock(&kvm->srcu); | |
451 | spin_lock(&kvm->mmu_lock); | |
452 | /* | |
453 | * Even though we do not flush TLB, this will still adversely | |
454 | * affect performance on pre-Haswell Intel EPT, where there is | |
455 | * no EPT Access Bit to clear so that we have to tear down EPT | |
456 | * tables instead. If we find this unacceptable, we can always | |
457 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
458 | * do anything on clear_young. | |
459 | * | |
460 | * Also note that currently we never issue secondary TLB flushes | |
461 | * from clear_young, leaving this job up to the regular system | |
462 | * cadence. If we find this inaccurate, we might come up with a | |
463 | * more sophisticated heuristic later. | |
464 | */ | |
465 | young = kvm_age_hva(kvm, start, end); | |
466 | spin_unlock(&kvm->mmu_lock); | |
467 | srcu_read_unlock(&kvm->srcu, idx); | |
468 | ||
469 | return young; | |
470 | } | |
471 | ||
8ee53820 AA |
472 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
473 | struct mm_struct *mm, | |
474 | unsigned long address) | |
475 | { | |
476 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
477 | int young, idx; | |
478 | ||
479 | idx = srcu_read_lock(&kvm->srcu); | |
480 | spin_lock(&kvm->mmu_lock); | |
481 | young = kvm_test_age_hva(kvm, address); | |
482 | spin_unlock(&kvm->mmu_lock); | |
483 | srcu_read_unlock(&kvm->srcu, idx); | |
484 | ||
485 | return young; | |
486 | } | |
487 | ||
85db06e5 MT |
488 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
489 | struct mm_struct *mm) | |
490 | { | |
491 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
492 | int idx; |
493 | ||
494 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 495 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 496 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
497 | } |
498 | ||
e930bffe | 499 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e930bffe AA |
500 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
501 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
502 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 503 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 504 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 505 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 506 | .release = kvm_mmu_notifier_release, |
e930bffe | 507 | }; |
4c07b0a4 AK |
508 | |
509 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
510 | { | |
511 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
512 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
513 | } | |
514 | ||
515 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
516 | ||
517 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
518 | { | |
519 | return 0; | |
520 | } | |
521 | ||
e930bffe AA |
522 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
523 | ||
a47d2b07 | 524 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
525 | { |
526 | int i; | |
a47d2b07 | 527 | struct kvm_memslots *slots; |
bf3e05bc | 528 | |
a7c3e901 | 529 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); |
a47d2b07 PB |
530 | if (!slots) |
531 | return NULL; | |
532 | ||
bf3e05bc | 533 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
f85e2cb5 | 534 | slots->id_to_index[i] = slots->memslots[i].id = i; |
a47d2b07 PB |
535 | |
536 | return slots; | |
537 | } | |
538 | ||
539 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
540 | { | |
541 | if (!memslot->dirty_bitmap) | |
542 | return; | |
543 | ||
544 | kvfree(memslot->dirty_bitmap); | |
545 | memslot->dirty_bitmap = NULL; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Free any memory in @free but not in @dont. | |
550 | */ | |
551 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
552 | struct kvm_memory_slot *dont) | |
553 | { | |
554 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
555 | kvm_destroy_dirty_bitmap(free); | |
556 | ||
557 | kvm_arch_free_memslot(kvm, free, dont); | |
558 | ||
559 | free->npages = 0; | |
560 | } | |
561 | ||
562 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
563 | { | |
564 | struct kvm_memory_slot *memslot; | |
565 | ||
566 | if (!slots) | |
567 | return; | |
568 | ||
569 | kvm_for_each_memslot(memslot, slots) | |
570 | kvm_free_memslot(kvm, memslot, NULL); | |
571 | ||
572 | kvfree(slots); | |
bf3e05bc XG |
573 | } |
574 | ||
536a6f88 JF |
575 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
576 | { | |
577 | int i; | |
578 | ||
579 | if (!kvm->debugfs_dentry) | |
580 | return; | |
581 | ||
582 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
583 | ||
9d5a1dce LC |
584 | if (kvm->debugfs_stat_data) { |
585 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
586 | kfree(kvm->debugfs_stat_data[i]); | |
587 | kfree(kvm->debugfs_stat_data); | |
588 | } | |
536a6f88 JF |
589 | } |
590 | ||
591 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
592 | { | |
593 | char dir_name[ITOA_MAX_LEN * 2]; | |
594 | struct kvm_stat_data *stat_data; | |
595 | struct kvm_stats_debugfs_item *p; | |
596 | ||
597 | if (!debugfs_initialized()) | |
598 | return 0; | |
599 | ||
600 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
929f45e3 | 601 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir); |
536a6f88 JF |
602 | |
603 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
604 | sizeof(*kvm->debugfs_stat_data), | |
605 | GFP_KERNEL); | |
606 | if (!kvm->debugfs_stat_data) | |
607 | return -ENOMEM; | |
608 | ||
609 | for (p = debugfs_entries; p->name; p++) { | |
610 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL); | |
611 | if (!stat_data) | |
612 | return -ENOMEM; | |
613 | ||
614 | stat_data->kvm = kvm; | |
615 | stat_data->offset = p->offset; | |
616 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; | |
929f45e3 GKH |
617 | debugfs_create_file(p->name, 0644, kvm->debugfs_dentry, |
618 | stat_data, stat_fops_per_vm[p->kind]); | |
536a6f88 JF |
619 | } |
620 | return 0; | |
621 | } | |
622 | ||
e08b9637 | 623 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 624 | { |
d89f5eff JK |
625 | int r, i; |
626 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 627 | |
d89f5eff JK |
628 | if (!kvm) |
629 | return ERR_PTR(-ENOMEM); | |
630 | ||
e9ad4ec8 | 631 | spin_lock_init(&kvm->mmu_lock); |
f1f10076 | 632 | mmgrab(current->mm); |
e9ad4ec8 PB |
633 | kvm->mm = current->mm; |
634 | kvm_eventfd_init(kvm); | |
635 | mutex_init(&kvm->lock); | |
636 | mutex_init(&kvm->irq_lock); | |
637 | mutex_init(&kvm->slots_lock); | |
e3736c3e | 638 | refcount_set(&kvm->users_count, 1); |
e9ad4ec8 PB |
639 | INIT_LIST_HEAD(&kvm->devices); |
640 | ||
e08b9637 | 641 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 642 | if (r) |
719d93cd | 643 | goto out_err_no_disable; |
10474ae8 AG |
644 | |
645 | r = hardware_enable_all(); | |
646 | if (r) | |
719d93cd | 647 | goto out_err_no_disable; |
10474ae8 | 648 | |
c77dcacb | 649 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 650 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 651 | #endif |
6aa8b732 | 652 | |
1e702d9a AW |
653 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
654 | ||
46a26bf5 | 655 | r = -ENOMEM; |
f481b069 | 656 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 PB |
657 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
658 | if (!slots) | |
f481b069 | 659 | goto out_err_no_srcu; |
4bd518f1 PB |
660 | /* |
661 | * Generations must be different for each address space. | |
662 | * Init kvm generation close to the maximum to easily test the | |
663 | * code of handling generation number wrap-around. | |
664 | */ | |
665 | slots->generation = i * 2 - 150; | |
666 | rcu_assign_pointer(kvm->memslots[i], slots); | |
f481b069 | 667 | } |
00f034a1 | 668 | |
bc6678a3 | 669 | if (init_srcu_struct(&kvm->srcu)) |
719d93cd CB |
670 | goto out_err_no_srcu; |
671 | if (init_srcu_struct(&kvm->irq_srcu)) | |
672 | goto out_err_no_irq_srcu; | |
e93f8a0f | 673 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 CB |
674 | rcu_assign_pointer(kvm->buses[i], |
675 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL)); | |
57e7fbee | 676 | if (!kvm->buses[i]) |
e93f8a0f | 677 | goto out_err; |
e93f8a0f | 678 | } |
e930bffe | 679 | |
74b5c5bf MW |
680 | r = kvm_init_mmu_notifier(kvm); |
681 | if (r) | |
682 | goto out_err; | |
683 | ||
2f303b74 | 684 | spin_lock(&kvm_lock); |
5e58cfe4 | 685 | list_add(&kvm->vm_list, &vm_list); |
2f303b74 | 686 | spin_unlock(&kvm_lock); |
d89f5eff | 687 | |
2ecd9d29 PZ |
688 | preempt_notifier_inc(); |
689 | ||
f17abe9a | 690 | return kvm; |
10474ae8 AG |
691 | |
692 | out_err: | |
719d93cd CB |
693 | cleanup_srcu_struct(&kvm->irq_srcu); |
694 | out_err_no_irq_srcu: | |
57e7fbee | 695 | cleanup_srcu_struct(&kvm->srcu); |
719d93cd | 696 | out_err_no_srcu: |
10474ae8 | 697 | hardware_disable_all(); |
719d93cd | 698 | out_err_no_disable: |
021086e3 | 699 | refcount_set(&kvm->users_count, 0); |
e93f8a0f | 700 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 701 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 702 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 703 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
d89f5eff | 704 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 705 | mmdrop(current->mm); |
10474ae8 | 706 | return ERR_PTR(r); |
f17abe9a AK |
707 | } |
708 | ||
07f0a7bd SW |
709 | static void kvm_destroy_devices(struct kvm *kvm) |
710 | { | |
e6e3b5a6 | 711 | struct kvm_device *dev, *tmp; |
07f0a7bd | 712 | |
a28ebea2 CD |
713 | /* |
714 | * We do not need to take the kvm->lock here, because nobody else | |
715 | * has a reference to the struct kvm at this point and therefore | |
716 | * cannot access the devices list anyhow. | |
717 | */ | |
e6e3b5a6 GT |
718 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
719 | list_del(&dev->vm_node); | |
07f0a7bd SW |
720 | dev->ops->destroy(dev); |
721 | } | |
722 | } | |
723 | ||
f17abe9a AK |
724 | static void kvm_destroy_vm(struct kvm *kvm) |
725 | { | |
e93f8a0f | 726 | int i; |
6d4e4c4f AK |
727 | struct mm_struct *mm = kvm->mm; |
728 | ||
286de8f6 | 729 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 730 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 731 | kvm_arch_sync_events(kvm); |
2f303b74 | 732 | spin_lock(&kvm_lock); |
133de902 | 733 | list_del(&kvm->vm_list); |
2f303b74 | 734 | spin_unlock(&kvm_lock); |
399ec807 | 735 | kvm_free_irq_routing(kvm); |
df630b8c | 736 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 737 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 738 | |
4a12f951 CB |
739 | if (bus) |
740 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
741 | kvm->buses[i] = NULL; |
742 | } | |
980da6ce | 743 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
744 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
745 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 746 | #else |
2df72e9b | 747 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 748 | #endif |
d19a9cd2 | 749 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 750 | kvm_destroy_devices(kvm); |
f481b069 | 751 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 752 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 753 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
754 | cleanup_srcu_struct(&kvm->srcu); |
755 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 756 | preempt_notifier_dec(); |
10474ae8 | 757 | hardware_disable_all(); |
6d4e4c4f | 758 | mmdrop(mm); |
f17abe9a AK |
759 | } |
760 | ||
d39f13b0 IE |
761 | void kvm_get_kvm(struct kvm *kvm) |
762 | { | |
e3736c3e | 763 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
764 | } |
765 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
766 | ||
767 | void kvm_put_kvm(struct kvm *kvm) | |
768 | { | |
e3736c3e | 769 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
770 | kvm_destroy_vm(kvm); |
771 | } | |
772 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
773 | ||
774 | ||
f17abe9a AK |
775 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
776 | { | |
777 | struct kvm *kvm = filp->private_data; | |
778 | ||
721eecbf GH |
779 | kvm_irqfd_release(kvm); |
780 | ||
d39f13b0 | 781 | kvm_put_kvm(kvm); |
6aa8b732 AK |
782 | return 0; |
783 | } | |
784 | ||
515a0127 TY |
785 | /* |
786 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 787 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 788 | */ |
a36a57b1 TY |
789 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
790 | { | |
515a0127 | 791 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 792 | |
a7c3e901 | 793 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL); |
a36a57b1 TY |
794 | if (!memslot->dirty_bitmap) |
795 | return -ENOMEM; | |
796 | ||
a36a57b1 TY |
797 | return 0; |
798 | } | |
799 | ||
bf3e05bc | 800 | /* |
0e60b079 IM |
801 | * Insert memslot and re-sort memslots based on their GFN, |
802 | * so binary search could be used to lookup GFN. | |
803 | * Sorting algorithm takes advantage of having initially | |
804 | * sorted array and known changed memslot position. | |
bf3e05bc | 805 | */ |
5cc15027 | 806 | static void update_memslots(struct kvm_memslots *slots, |
31fc4f95 WY |
807 | struct kvm_memory_slot *new, |
808 | enum kvm_mr_change change) | |
bf3e05bc | 809 | { |
8593176c PB |
810 | int id = new->id; |
811 | int i = slots->id_to_index[id]; | |
063584d4 | 812 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 813 | |
8593176c | 814 | WARN_ON(mslots[i].id != id); |
31fc4f95 WY |
815 | switch (change) { |
816 | case KVM_MR_CREATE: | |
817 | slots->used_slots++; | |
818 | WARN_ON(mslots[i].npages || !new->npages); | |
819 | break; | |
820 | case KVM_MR_DELETE: | |
821 | slots->used_slots--; | |
822 | WARN_ON(new->npages || !mslots[i].npages); | |
823 | break; | |
824 | default: | |
825 | break; | |
9c1a5d38 | 826 | } |
0e60b079 | 827 | |
7f379cff | 828 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
829 | new->base_gfn <= mslots[i + 1].base_gfn) { |
830 | if (!mslots[i + 1].npages) | |
831 | break; | |
7f379cff IM |
832 | mslots[i] = mslots[i + 1]; |
833 | slots->id_to_index[mslots[i].id] = i; | |
834 | i++; | |
835 | } | |
efbeec70 PB |
836 | |
837 | /* | |
838 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
839 | * so that it moves before all those with base_gfn == npages == 0. | |
840 | * | |
841 | * On the other hand, if new->npages is zero, the above loop has | |
842 | * already left i pointing to the beginning of the empty part of | |
843 | * mslots, and the ">=" would move the hole backwards in this | |
844 | * case---which is wrong. So skip the loop when deleting a slot. | |
845 | */ | |
846 | if (new->npages) { | |
847 | while (i > 0 && | |
848 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
849 | mslots[i] = mslots[i - 1]; | |
850 | slots->id_to_index[mslots[i].id] = i; | |
851 | i--; | |
852 | } | |
dbaff309 PB |
853 | } else |
854 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 855 | |
8593176c PB |
856 | mslots[i] = *new; |
857 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
858 | } |
859 | ||
09170a49 | 860 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 861 | { |
4d8b81ab XG |
862 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
863 | ||
0f8a4de3 | 864 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
865 | valid_flags |= KVM_MEM_READONLY; |
866 | #endif | |
867 | ||
868 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
869 | return -EINVAL; |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
7ec4fb44 | 874 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 875 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 876 | { |
f481b069 | 877 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
7ec4fb44 | 878 | |
ee3d1570 DM |
879 | /* |
880 | * Set the low bit in the generation, which disables SPTE caching | |
881 | * until the end of synchronize_srcu_expedited. | |
882 | */ | |
883 | WARN_ON(old_memslots->generation & 1); | |
884 | slots->generation = old_memslots->generation + 1; | |
885 | ||
f481b069 | 886 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 887 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 888 | |
ee3d1570 DM |
889 | /* |
890 | * Increment the new memslot generation a second time. This prevents | |
891 | * vm exits that race with memslot updates from caching a memslot | |
892 | * generation that will (potentially) be valid forever. | |
4bd518f1 PB |
893 | * |
894 | * Generations must be unique even across address spaces. We do not need | |
895 | * a global counter for that, instead the generation space is evenly split | |
896 | * across address spaces. For example, with two address spaces, address | |
897 | * space 0 will use generations 0, 4, 8, ... while * address space 1 will | |
898 | * use generations 2, 6, 10, 14, ... | |
ee3d1570 | 899 | */ |
4bd518f1 | 900 | slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1; |
ee3d1570 | 901 | |
15f46015 | 902 | kvm_arch_memslots_updated(kvm, slots); |
e59dbe09 TY |
903 | |
904 | return old_memslots; | |
7ec4fb44 GN |
905 | } |
906 | ||
6aa8b732 AK |
907 | /* |
908 | * Allocate some memory and give it an address in the guest physical address | |
909 | * space. | |
910 | * | |
911 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 912 | * |
02d5d55b | 913 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 914 | */ |
f78e0e2e | 915 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 916 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 917 | { |
8234b22e | 918 | int r; |
6aa8b732 | 919 | gfn_t base_gfn; |
28bcb112 | 920 | unsigned long npages; |
a843fac2 | 921 | struct kvm_memory_slot *slot; |
6aa8b732 | 922 | struct kvm_memory_slot old, new; |
b7f69c55 | 923 | struct kvm_memslots *slots = NULL, *old_memslots; |
f481b069 | 924 | int as_id, id; |
f64c0398 | 925 | enum kvm_mr_change change; |
6aa8b732 | 926 | |
a50d64d6 XG |
927 | r = check_memory_region_flags(mem); |
928 | if (r) | |
929 | goto out; | |
930 | ||
6aa8b732 | 931 | r = -EINVAL; |
f481b069 PB |
932 | as_id = mem->slot >> 16; |
933 | id = (u16)mem->slot; | |
934 | ||
6aa8b732 AK |
935 | /* General sanity checks */ |
936 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
937 | goto out; | |
938 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
939 | goto out; | |
fa3d315a | 940 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 941 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 942 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
9e3bb6b6 HC |
943 | !access_ok(VERIFY_WRITE, |
944 | (void __user *)(unsigned long)mem->userspace_addr, | |
945 | mem->memory_size))) | |
78749809 | 946 | goto out; |
f481b069 | 947 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
948 | goto out; |
949 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
950 | goto out; | |
951 | ||
f481b069 | 952 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
6aa8b732 AK |
953 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
954 | npages = mem->memory_size >> PAGE_SHIFT; | |
955 | ||
660c22c4 TY |
956 | if (npages > KVM_MEM_MAX_NR_PAGES) |
957 | goto out; | |
958 | ||
a843fac2 | 959 | new = old = *slot; |
6aa8b732 | 960 | |
f481b069 | 961 | new.id = id; |
6aa8b732 AK |
962 | new.base_gfn = base_gfn; |
963 | new.npages = npages; | |
964 | new.flags = mem->flags; | |
965 | ||
f64c0398 TY |
966 | if (npages) { |
967 | if (!old.npages) | |
968 | change = KVM_MR_CREATE; | |
969 | else { /* Modify an existing slot. */ | |
970 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
971 | (npages != old.npages) || |
972 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
973 | goto out; |
974 | ||
975 | if (base_gfn != old.base_gfn) | |
976 | change = KVM_MR_MOVE; | |
977 | else if (new.flags != old.flags) | |
978 | change = KVM_MR_FLAGS_ONLY; | |
979 | else { /* Nothing to change. */ | |
980 | r = 0; | |
981 | goto out; | |
982 | } | |
983 | } | |
09170a49 PB |
984 | } else { |
985 | if (!old.npages) | |
986 | goto out; | |
987 | ||
f64c0398 | 988 | change = KVM_MR_DELETE; |
09170a49 PB |
989 | new.base_gfn = 0; |
990 | new.flags = 0; | |
991 | } | |
6aa8b732 | 992 | |
f64c0398 | 993 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
994 | /* Check for overlaps */ |
995 | r = -EEXIST; | |
f481b069 | 996 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
b28676bb | 997 | if (slot->id == id) |
0a706bee TY |
998 | continue; |
999 | if (!((base_gfn + npages <= slot->base_gfn) || | |
1000 | (base_gfn >= slot->base_gfn + slot->npages))) | |
1001 | goto out; | |
1002 | } | |
6aa8b732 | 1003 | } |
6aa8b732 | 1004 | |
6aa8b732 AK |
1005 | /* Free page dirty bitmap if unneeded */ |
1006 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 1007 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
1008 | |
1009 | r = -ENOMEM; | |
f64c0398 | 1010 | if (change == KVM_MR_CREATE) { |
189a2f7b | 1011 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 1012 | |
5587027c | 1013 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 1014 | goto out_free; |
6aa8b732 | 1015 | } |
ec04b260 | 1016 | |
6aa8b732 AK |
1017 | /* Allocate page dirty bitmap if needed */ |
1018 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 1019 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 1020 | goto out_free; |
6aa8b732 AK |
1021 | } |
1022 | ||
a7c3e901 | 1023 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); |
f2a81036 PB |
1024 | if (!slots) |
1025 | goto out_free; | |
f481b069 | 1026 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
f2a81036 | 1027 | |
f64c0398 | 1028 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
f481b069 | 1029 | slot = id_to_memslot(slots, id); |
28a37544 XG |
1030 | slot->flags |= KVM_MEMSLOT_INVALID; |
1031 | ||
f481b069 | 1032 | old_memslots = install_new_memslots(kvm, as_id, slots); |
bc6678a3 | 1033 | |
12d6e753 MT |
1034 | /* From this point no new shadow pages pointing to a deleted, |
1035 | * or moved, memslot will be created. | |
bc6678a3 MT |
1036 | * |
1037 | * validation of sp->gfn happens in: | |
b7d409de XL |
1038 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
1039 | * - kvm_is_visible_gfn (mmu_check_roots) | |
bc6678a3 | 1040 | */ |
2df72e9b | 1041 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
1042 | |
1043 | /* | |
1044 | * We can re-use the old_memslots from above, the only difference | |
1045 | * from the currently installed memslots is the invalid flag. This | |
1046 | * will get overwritten by update_memslots anyway. | |
1047 | */ | |
b7f69c55 | 1048 | slots = old_memslots; |
bc6678a3 | 1049 | } |
34d4cb8f | 1050 | |
7b6195a9 | 1051 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 1052 | if (r) |
b7f69c55 | 1053 | goto out_slots; |
f7784b8e | 1054 | |
a47d2b07 | 1055 | /* actual memory is freed via old in kvm_free_memslot below */ |
f64c0398 | 1056 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 1057 | new.dirty_bitmap = NULL; |
db3fe4eb | 1058 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
1059 | } |
1060 | ||
31fc4f95 | 1061 | update_memslots(slots, &new, change); |
f481b069 | 1062 | old_memslots = install_new_memslots(kvm, as_id, slots); |
3ad82a7e | 1063 | |
f36f3f28 | 1064 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
82ce2c96 | 1065 | |
a47d2b07 | 1066 | kvm_free_memslot(kvm, &old, &new); |
74496134 | 1067 | kvfree(old_memslots); |
6aa8b732 AK |
1068 | return 0; |
1069 | ||
e40f193f | 1070 | out_slots: |
74496134 | 1071 | kvfree(slots); |
f78e0e2e | 1072 | out_free: |
a47d2b07 | 1073 | kvm_free_memslot(kvm, &new, &old); |
6aa8b732 AK |
1074 | out: |
1075 | return r; | |
210c7c4d | 1076 | } |
f78e0e2e SY |
1077 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1078 | ||
1079 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1080 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1081 | { |
1082 | int r; | |
1083 | ||
79fac95e | 1084 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1085 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1086 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1087 | return r; |
1088 | } | |
210c7c4d IE |
1089 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1090 | ||
7940876e SH |
1091 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1092 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1093 | { |
f481b069 | 1094 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1095 | return -EINVAL; |
09170a49 | 1096 | |
47ae31e2 | 1097 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1098 | } |
1099 | ||
5bb064dc ZX |
1100 | int kvm_get_dirty_log(struct kvm *kvm, |
1101 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 | 1102 | { |
9f6b8029 | 1103 | struct kvm_memslots *slots; |
6aa8b732 | 1104 | struct kvm_memory_slot *memslot; |
843574a3 | 1105 | int i, as_id, id; |
87bf6e7d | 1106 | unsigned long n; |
6aa8b732 AK |
1107 | unsigned long any = 0; |
1108 | ||
f481b069 PB |
1109 | as_id = log->slot >> 16; |
1110 | id = (u16)log->slot; | |
1111 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1112 | return -EINVAL; |
6aa8b732 | 1113 | |
f481b069 PB |
1114 | slots = __kvm_memslots(kvm, as_id); |
1115 | memslot = id_to_memslot(slots, id); | |
6aa8b732 | 1116 | if (!memslot->dirty_bitmap) |
843574a3 | 1117 | return -ENOENT; |
6aa8b732 | 1118 | |
87bf6e7d | 1119 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 1120 | |
cd1a4a98 | 1121 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
1122 | any = memslot->dirty_bitmap[i]; |
1123 | ||
6aa8b732 | 1124 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
843574a3 | 1125 | return -EFAULT; |
6aa8b732 | 1126 | |
5bb064dc ZX |
1127 | if (any) |
1128 | *is_dirty = 1; | |
843574a3 | 1129 | return 0; |
6aa8b732 | 1130 | } |
2ba9f0d8 | 1131 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1132 | |
ba0513b5 MS |
1133 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
1134 | /** | |
1135 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages | |
1136 | * are dirty write protect them for next write. | |
1137 | * @kvm: pointer to kvm instance | |
1138 | * @log: slot id and address to which we copy the log | |
1139 | * @is_dirty: flag set if any page is dirty | |
1140 | * | |
1141 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1142 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1143 | * following order: | |
1144 | * | |
1145 | * 1. Take a snapshot of the bit and clear it if needed. | |
1146 | * 2. Write protect the corresponding page. | |
1147 | * 3. Copy the snapshot to the userspace. | |
1148 | * 4. Upon return caller flushes TLB's if needed. | |
1149 | * | |
1150 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1151 | * entry. This is not a problem because the page is reported dirty using | |
1152 | * the snapshot taken before and step 4 ensures that writes done after | |
1153 | * exiting to userspace will be logged for the next call. | |
1154 | * | |
1155 | */ | |
1156 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
1157 | struct kvm_dirty_log *log, bool *is_dirty) | |
1158 | { | |
9f6b8029 | 1159 | struct kvm_memslots *slots; |
ba0513b5 | 1160 | struct kvm_memory_slot *memslot; |
58d6db34 | 1161 | int i, as_id, id; |
ba0513b5 MS |
1162 | unsigned long n; |
1163 | unsigned long *dirty_bitmap; | |
1164 | unsigned long *dirty_bitmap_buffer; | |
1165 | ||
f481b069 PB |
1166 | as_id = log->slot >> 16; |
1167 | id = (u16)log->slot; | |
1168 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1169 | return -EINVAL; |
ba0513b5 | 1170 | |
f481b069 PB |
1171 | slots = __kvm_memslots(kvm, as_id); |
1172 | memslot = id_to_memslot(slots, id); | |
ba0513b5 MS |
1173 | |
1174 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1175 | if (!dirty_bitmap) |
58d6db34 | 1176 | return -ENOENT; |
ba0513b5 MS |
1177 | |
1178 | n = kvm_dirty_bitmap_bytes(memslot); | |
1179 | ||
03133347 | 1180 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
ba0513b5 MS |
1181 | memset(dirty_bitmap_buffer, 0, n); |
1182 | ||
1183 | spin_lock(&kvm->mmu_lock); | |
1184 | *is_dirty = false; | |
1185 | for (i = 0; i < n / sizeof(long); i++) { | |
1186 | unsigned long mask; | |
1187 | gfn_t offset; | |
1188 | ||
1189 | if (!dirty_bitmap[i]) | |
1190 | continue; | |
1191 | ||
1192 | *is_dirty = true; | |
1193 | ||
1194 | mask = xchg(&dirty_bitmap[i], 0); | |
1195 | dirty_bitmap_buffer[i] = mask; | |
1196 | ||
58d2930f TY |
1197 | if (mask) { |
1198 | offset = i * BITS_PER_LONG; | |
1199 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1200 | offset, mask); | |
1201 | } | |
ba0513b5 MS |
1202 | } |
1203 | ||
1204 | spin_unlock(&kvm->mmu_lock); | |
ba0513b5 | 1205 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) |
58d6db34 ME |
1206 | return -EFAULT; |
1207 | return 0; | |
ba0513b5 MS |
1208 | } |
1209 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1210 | #endif | |
1211 | ||
db3fe4eb TY |
1212 | bool kvm_largepages_enabled(void) |
1213 | { | |
1214 | return largepages_enabled; | |
1215 | } | |
1216 | ||
54dee993 MT |
1217 | void kvm_disable_largepages(void) |
1218 | { | |
1219 | largepages_enabled = false; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1222 | ||
49c7754c GN |
1223 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1224 | { | |
1225 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1226 | } | |
a1f4d395 | 1227 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1228 | |
8e73485c PB |
1229 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1230 | { | |
1231 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1232 | } | |
1233 | ||
33e94154 | 1234 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 1235 | { |
bf3e05bc | 1236 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1237 | |
bbacc0c1 | 1238 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc | 1239 | memslot->flags & KVM_MEMSLOT_INVALID) |
33e94154 | 1240 | return false; |
e0d62c7f | 1241 | |
33e94154 | 1242 | return true; |
e0d62c7f IE |
1243 | } |
1244 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1245 | ||
8f0b1ab6 JR |
1246 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1247 | { | |
1248 | struct vm_area_struct *vma; | |
1249 | unsigned long addr, size; | |
1250 | ||
1251 | size = PAGE_SIZE; | |
1252 | ||
1253 | addr = gfn_to_hva(kvm, gfn); | |
1254 | if (kvm_is_error_hva(addr)) | |
1255 | return PAGE_SIZE; | |
1256 | ||
1257 | down_read(¤t->mm->mmap_sem); | |
1258 | vma = find_vma(current->mm, addr); | |
1259 | if (!vma) | |
1260 | goto out; | |
1261 | ||
1262 | size = vma_kernel_pagesize(vma); | |
1263 | ||
1264 | out: | |
1265 | up_read(¤t->mm->mmap_sem); | |
1266 | ||
1267 | return size; | |
1268 | } | |
1269 | ||
4d8b81ab XG |
1270 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1271 | { | |
1272 | return slot->flags & KVM_MEM_READONLY; | |
1273 | } | |
1274 | ||
4d8b81ab XG |
1275 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1276 | gfn_t *nr_pages, bool write) | |
539cb660 | 1277 | { |
bc6678a3 | 1278 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1279 | return KVM_HVA_ERR_BAD; |
48987781 | 1280 | |
4d8b81ab XG |
1281 | if (memslot_is_readonly(slot) && write) |
1282 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1283 | |
1284 | if (nr_pages) | |
1285 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1286 | ||
4d8b81ab | 1287 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1288 | } |
48987781 | 1289 | |
4d8b81ab XG |
1290 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1291 | gfn_t *nr_pages) | |
1292 | { | |
1293 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1294 | } |
48987781 | 1295 | |
4d8b81ab | 1296 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1297 | gfn_t gfn) |
4d8b81ab XG |
1298 | { |
1299 | return gfn_to_hva_many(slot, gfn, NULL); | |
1300 | } | |
1301 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1302 | ||
48987781 XG |
1303 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1304 | { | |
49c7754c | 1305 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1306 | } |
0d150298 | 1307 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1308 | |
8e73485c PB |
1309 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1310 | { | |
1311 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1314 | ||
86ab8cff | 1315 | /* |
970c0d4b WY |
1316 | * Return the hva of a @gfn and the R/W attribute if possible. |
1317 | * | |
1318 | * @slot: the kvm_memory_slot which contains @gfn | |
1319 | * @gfn: the gfn to be translated | |
1320 | * @writable: used to return the read/write attribute of the @slot if the hva | |
1321 | * is valid and @writable is not NULL | |
86ab8cff | 1322 | */ |
64d83126 CD |
1323 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1324 | gfn_t gfn, bool *writable) | |
86ab8cff | 1325 | { |
a2ac07fe GN |
1326 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1327 | ||
1328 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1329 | *writable = !memslot_is_readonly(slot); |
1330 | ||
a2ac07fe | 1331 | return hva; |
86ab8cff XG |
1332 | } |
1333 | ||
64d83126 CD |
1334 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1335 | { | |
1336 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1337 | ||
1338 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1339 | } | |
1340 | ||
8e73485c PB |
1341 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1342 | { | |
1343 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1344 | ||
1345 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1346 | } | |
1347 | ||
fafc3dba HY |
1348 | static inline int check_user_page_hwpoison(unsigned long addr) |
1349 | { | |
0d731759 | 1350 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 1351 | |
0d731759 | 1352 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
1353 | return rc == -EHWPOISON; |
1354 | } | |
1355 | ||
2fc84311 | 1356 | /* |
b9b33da2 PB |
1357 | * The fast path to get the writable pfn which will be stored in @pfn, |
1358 | * true indicates success, otherwise false is returned. It's also the | |
1359 | * only part that runs if we can are in atomic context. | |
2fc84311 | 1360 | */ |
b9b33da2 PB |
1361 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
1362 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 1363 | { |
8d4e1288 | 1364 | struct page *page[1]; |
2fc84311 | 1365 | int npages; |
954bbbc2 | 1366 | |
12ce13fe XG |
1367 | /* |
1368 | * Fast pin a writable pfn only if it is a write fault request | |
1369 | * or the caller allows to map a writable pfn for a read fault | |
1370 | * request. | |
1371 | */ | |
1372 | if (!(write_fault || writable)) | |
1373 | return false; | |
612819c3 | 1374 | |
2fc84311 XG |
1375 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1376 | if (npages == 1) { | |
1377 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1378 | |
2fc84311 XG |
1379 | if (writable) |
1380 | *writable = true; | |
1381 | return true; | |
1382 | } | |
af585b92 | 1383 | |
2fc84311 XG |
1384 | return false; |
1385 | } | |
612819c3 | 1386 | |
2fc84311 XG |
1387 | /* |
1388 | * The slow path to get the pfn of the specified host virtual address, | |
1389 | * 1 indicates success, -errno is returned if error is detected. | |
1390 | */ | |
1391 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 1392 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 1393 | { |
ce53053c AV |
1394 | unsigned int flags = FOLL_HWPOISON; |
1395 | struct page *page; | |
2fc84311 | 1396 | int npages = 0; |
612819c3 | 1397 | |
2fc84311 XG |
1398 | might_sleep(); |
1399 | ||
1400 | if (writable) | |
1401 | *writable = write_fault; | |
1402 | ||
ce53053c AV |
1403 | if (write_fault) |
1404 | flags |= FOLL_WRITE; | |
1405 | if (async) | |
1406 | flags |= FOLL_NOWAIT; | |
d4944b0e | 1407 | |
ce53053c | 1408 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
1409 | if (npages != 1) |
1410 | return npages; | |
1411 | ||
1412 | /* map read fault as writable if possible */ | |
12ce13fe | 1413 | if (unlikely(!write_fault) && writable) { |
ce53053c | 1414 | struct page *wpage; |
2fc84311 | 1415 | |
ce53053c | 1416 | if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { |
2fc84311 | 1417 | *writable = true; |
ce53053c AV |
1418 | put_page(page); |
1419 | page = wpage; | |
612819c3 | 1420 | } |
887c08ac | 1421 | } |
ce53053c | 1422 | *pfn = page_to_pfn(page); |
2fc84311 XG |
1423 | return npages; |
1424 | } | |
539cb660 | 1425 | |
4d8b81ab XG |
1426 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1427 | { | |
1428 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1429 | return false; | |
2e2e3738 | 1430 | |
4d8b81ab XG |
1431 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1432 | return false; | |
887c08ac | 1433 | |
4d8b81ab XG |
1434 | return true; |
1435 | } | |
bf998156 | 1436 | |
92176a8e PB |
1437 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
1438 | unsigned long addr, bool *async, | |
a340b3e2 KA |
1439 | bool write_fault, bool *writable, |
1440 | kvm_pfn_t *p_pfn) | |
92176a8e | 1441 | { |
add6a0cd PB |
1442 | unsigned long pfn; |
1443 | int r; | |
1444 | ||
1445 | r = follow_pfn(vma, addr, &pfn); | |
1446 | if (r) { | |
1447 | /* | |
1448 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1449 | * not call the fault handler, so do it here. | |
1450 | */ | |
1451 | bool unlocked = false; | |
1452 | r = fixup_user_fault(current, current->mm, addr, | |
1453 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1454 | &unlocked); | |
1455 | if (unlocked) | |
1456 | return -EAGAIN; | |
1457 | if (r) | |
1458 | return r; | |
1459 | ||
1460 | r = follow_pfn(vma, addr, &pfn); | |
1461 | if (r) | |
1462 | return r; | |
1463 | ||
1464 | } | |
1465 | ||
a340b3e2 KA |
1466 | if (writable) |
1467 | *writable = true; | |
add6a0cd PB |
1468 | |
1469 | /* | |
1470 | * Get a reference here because callers of *hva_to_pfn* and | |
1471 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1472 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1473 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1474 | * simply do nothing for reserved pfns. | |
1475 | * | |
1476 | * Whoever called remap_pfn_range is also going to call e.g. | |
1477 | * unmap_mapping_range before the underlying pages are freed, | |
1478 | * causing a call to our MMU notifier. | |
1479 | */ | |
1480 | kvm_get_pfn(pfn); | |
1481 | ||
1482 | *p_pfn = pfn; | |
92176a8e PB |
1483 | return 0; |
1484 | } | |
1485 | ||
12ce13fe XG |
1486 | /* |
1487 | * Pin guest page in memory and return its pfn. | |
1488 | * @addr: host virtual address which maps memory to the guest | |
1489 | * @atomic: whether this function can sleep | |
1490 | * @async: whether this function need to wait IO complete if the | |
1491 | * host page is not in the memory | |
1492 | * @write_fault: whether we should get a writable host page | |
1493 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1494 | * | |
1495 | * The function will map a writable host page for these two cases: | |
1496 | * 1): @write_fault = true | |
1497 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1498 | * whether the mapping is writable. | |
1499 | */ | |
ba049e93 | 1500 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
1501 | bool write_fault, bool *writable) |
1502 | { | |
1503 | struct vm_area_struct *vma; | |
ba049e93 | 1504 | kvm_pfn_t pfn = 0; |
92176a8e | 1505 | int npages, r; |
2e2e3738 | 1506 | |
2fc84311 XG |
1507 | /* we can do it either atomically or asynchronously, not both */ |
1508 | BUG_ON(atomic && async); | |
8d4e1288 | 1509 | |
b9b33da2 | 1510 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
1511 | return pfn; |
1512 | ||
1513 | if (atomic) | |
1514 | return KVM_PFN_ERR_FAULT; | |
1515 | ||
1516 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1517 | if (npages == 1) | |
1518 | return pfn; | |
8d4e1288 | 1519 | |
2fc84311 XG |
1520 | down_read(¤t->mm->mmap_sem); |
1521 | if (npages == -EHWPOISON || | |
1522 | (!async && check_user_page_hwpoison(addr))) { | |
1523 | pfn = KVM_PFN_ERR_HWPOISON; | |
1524 | goto exit; | |
1525 | } | |
1526 | ||
add6a0cd | 1527 | retry: |
2fc84311 XG |
1528 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
1529 | ||
1530 | if (vma == NULL) | |
1531 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 1532 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 1533 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
add6a0cd PB |
1534 | if (r == -EAGAIN) |
1535 | goto retry; | |
92176a8e PB |
1536 | if (r < 0) |
1537 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 1538 | } else { |
4d8b81ab | 1539 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1540 | *async = true; |
1541 | pfn = KVM_PFN_ERR_FAULT; | |
1542 | } | |
1543 | exit: | |
1544 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1545 | return pfn; |
35149e21 AL |
1546 | } |
1547 | ||
ba049e93 DW |
1548 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
1549 | bool atomic, bool *async, bool write_fault, | |
1550 | bool *writable) | |
887c08ac | 1551 | { |
4d8b81ab XG |
1552 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1553 | ||
b2740d35 PB |
1554 | if (addr == KVM_HVA_ERR_RO_BAD) { |
1555 | if (writable) | |
1556 | *writable = false; | |
4d8b81ab | 1557 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 1558 | } |
4d8b81ab | 1559 | |
b2740d35 PB |
1560 | if (kvm_is_error_hva(addr)) { |
1561 | if (writable) | |
1562 | *writable = false; | |
81c52c56 | 1563 | return KVM_PFN_NOSLOT; |
b2740d35 | 1564 | } |
4d8b81ab XG |
1565 | |
1566 | /* Do not map writable pfn in the readonly memslot. */ | |
1567 | if (writable && memslot_is_readonly(slot)) { | |
1568 | *writable = false; | |
1569 | writable = NULL; | |
1570 | } | |
1571 | ||
1572 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1573 | writable); | |
887c08ac | 1574 | } |
3520469d | 1575 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1576 | |
ba049e93 | 1577 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
1578 | bool *writable) |
1579 | { | |
e37afc6e PB |
1580 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1581 | write_fault, writable); | |
612819c3 MT |
1582 | } |
1583 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1584 | ||
ba049e93 | 1585 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1586 | { |
4d8b81ab | 1587 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1588 | } |
e37afc6e | 1589 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1590 | |
ba049e93 | 1591 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1592 | { |
4d8b81ab | 1593 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1594 | } |
037d92dc | 1595 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1596 | |
ba049e93 | 1597 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1598 | { |
1599 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1600 | } | |
1601 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1602 | ||
ba049e93 | 1603 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1604 | { |
1605 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1606 | } | |
1607 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1608 | ||
ba049e93 | 1609 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1610 | { |
1611 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1612 | } | |
1613 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1614 | ||
ba049e93 | 1615 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1616 | { |
1617 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1620 | ||
d9ef13c2 PB |
1621 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1622 | struct page **pages, int nr_pages) | |
48987781 XG |
1623 | { |
1624 | unsigned long addr; | |
076b925d | 1625 | gfn_t entry = 0; |
48987781 | 1626 | |
d9ef13c2 | 1627 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
1628 | if (kvm_is_error_hva(addr)) |
1629 | return -1; | |
1630 | ||
1631 | if (entry < nr_pages) | |
1632 | return 0; | |
1633 | ||
1634 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1635 | } | |
1636 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1637 | ||
ba049e93 | 1638 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 1639 | { |
81c52c56 | 1640 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1641 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1642 | |
bf4bea8e | 1643 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1644 | WARN_ON(1); |
6cede2e6 | 1645 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1646 | } |
a2766325 XG |
1647 | |
1648 | return pfn_to_page(pfn); | |
1649 | } | |
1650 | ||
35149e21 AL |
1651 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1652 | { | |
ba049e93 | 1653 | kvm_pfn_t pfn; |
2e2e3738 AL |
1654 | |
1655 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1656 | |
a2766325 | 1657 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
1658 | } |
1659 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1660 | ||
8e73485c PB |
1661 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
1662 | { | |
ba049e93 | 1663 | kvm_pfn_t pfn; |
8e73485c PB |
1664 | |
1665 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1666 | ||
1667 | return kvm_pfn_to_page(pfn); | |
1668 | } | |
1669 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1670 | ||
b4231d61 IE |
1671 | void kvm_release_page_clean(struct page *page) |
1672 | { | |
32cad84f XG |
1673 | WARN_ON(is_error_page(page)); |
1674 | ||
35149e21 | 1675 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1676 | } |
1677 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1678 | ||
ba049e93 | 1679 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 1680 | { |
bf4bea8e | 1681 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1682 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1683 | } |
1684 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1685 | ||
b4231d61 | 1686 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1687 | { |
a2766325 XG |
1688 | WARN_ON(is_error_page(page)); |
1689 | ||
35149e21 AL |
1690 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1693 | ||
f7a6509f | 1694 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
1695 | { |
1696 | kvm_set_pfn_dirty(pfn); | |
1697 | kvm_release_pfn_clean(pfn); | |
1698 | } | |
f7a6509f | 1699 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 1700 | |
ba049e93 | 1701 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 1702 | { |
bf4bea8e | 1703 | if (!kvm_is_reserved_pfn(pfn)) { |
2e2e3738 | 1704 | struct page *page = pfn_to_page(pfn); |
f95ef0cd | 1705 | |
2e2e3738 AL |
1706 | if (!PageReserved(page)) |
1707 | SetPageDirty(page); | |
1708 | } | |
8a7ae055 | 1709 | } |
35149e21 AL |
1710 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1711 | ||
ba049e93 | 1712 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 1713 | { |
bf4bea8e | 1714 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1715 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1716 | } |
1717 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1718 | ||
ba049e93 | 1719 | void kvm_get_pfn(kvm_pfn_t pfn) |
35149e21 | 1720 | { |
bf4bea8e | 1721 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1722 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1723 | } |
1724 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1725 | |
195aefde IE |
1726 | static int next_segment(unsigned long len, int offset) |
1727 | { | |
1728 | if (len > PAGE_SIZE - offset) | |
1729 | return PAGE_SIZE - offset; | |
1730 | else | |
1731 | return len; | |
1732 | } | |
1733 | ||
8e73485c PB |
1734 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
1735 | void *data, int offset, int len) | |
195aefde | 1736 | { |
e0506bcb IE |
1737 | int r; |
1738 | unsigned long addr; | |
195aefde | 1739 | |
8e73485c | 1740 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
1741 | if (kvm_is_error_hva(addr)) |
1742 | return -EFAULT; | |
3180a7fc | 1743 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1744 | if (r) |
195aefde | 1745 | return -EFAULT; |
195aefde IE |
1746 | return 0; |
1747 | } | |
8e73485c PB |
1748 | |
1749 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1750 | int len) | |
1751 | { | |
1752 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1753 | ||
1754 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1755 | } | |
195aefde IE |
1756 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1757 | ||
8e73485c PB |
1758 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
1759 | int offset, int len) | |
1760 | { | |
1761 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1762 | ||
1763 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1764 | } | |
1765 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1766 | ||
195aefde IE |
1767 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1768 | { | |
1769 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1770 | int seg; | |
1771 | int offset = offset_in_page(gpa); | |
1772 | int ret; | |
1773 | ||
1774 | while ((seg = next_segment(len, offset)) != 0) { | |
1775 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1776 | if (ret < 0) | |
1777 | return ret; | |
1778 | offset = 0; | |
1779 | len -= seg; | |
1780 | data += seg; | |
1781 | ++gfn; | |
1782 | } | |
1783 | return 0; | |
1784 | } | |
1785 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1786 | ||
8e73485c | 1787 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 1788 | { |
7ec54588 | 1789 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 1790 | int seg; |
7ec54588 | 1791 | int offset = offset_in_page(gpa); |
8e73485c PB |
1792 | int ret; |
1793 | ||
1794 | while ((seg = next_segment(len, offset)) != 0) { | |
1795 | ret = kvm_vcpu_read_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_read_guest); | |
7ec54588 | 1806 | |
8e73485c PB |
1807 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1808 | void *data, int offset, unsigned long len) | |
1809 | { | |
1810 | int r; | |
1811 | unsigned long addr; | |
1812 | ||
1813 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
1814 | if (kvm_is_error_hva(addr)) |
1815 | return -EFAULT; | |
0aac03f0 | 1816 | pagefault_disable(); |
3180a7fc | 1817 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1818 | pagefault_enable(); |
7ec54588 MT |
1819 | if (r) |
1820 | return -EFAULT; | |
1821 | return 0; | |
1822 | } | |
7ec54588 | 1823 | |
8e73485c PB |
1824 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1825 | unsigned long len) | |
1826 | { | |
1827 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1828 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1829 | int offset = offset_in_page(gpa); | |
1830 | ||
1831 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1832 | } | |
1833 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1834 | ||
1835 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1836 | void *data, unsigned long len) | |
1837 | { | |
1838 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1839 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1840 | int offset = offset_in_page(gpa); | |
1841 | ||
1842 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1843 | } | |
1844 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1845 | ||
1846 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1847 | const void *data, int offset, int len) | |
195aefde | 1848 | { |
e0506bcb IE |
1849 | int r; |
1850 | unsigned long addr; | |
195aefde | 1851 | |
251eb841 | 1852 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
1853 | if (kvm_is_error_hva(addr)) |
1854 | return -EFAULT; | |
8b0cedff | 1855 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1856 | if (r) |
195aefde | 1857 | return -EFAULT; |
bc009e43 | 1858 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
1859 | return 0; |
1860 | } | |
8e73485c PB |
1861 | |
1862 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
1863 | const void *data, int offset, int len) | |
1864 | { | |
1865 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1866 | ||
1867 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1868 | } | |
195aefde IE |
1869 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
1870 | ||
8e73485c PB |
1871 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
1872 | const void *data, int offset, int len) | |
1873 | { | |
1874 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1875 | ||
1876 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1877 | } | |
1878 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
1879 | ||
195aefde IE |
1880 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
1881 | unsigned long len) | |
1882 | { | |
1883 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1884 | int seg; | |
1885 | int offset = offset_in_page(gpa); | |
1886 | int ret; | |
1887 | ||
1888 | while ((seg = next_segment(len, offset)) != 0) { | |
1889 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1890 | if (ret < 0) | |
1891 | return ret; | |
1892 | offset = 0; | |
1893 | len -= seg; | |
1894 | data += seg; | |
1895 | ++gfn; | |
1896 | } | |
1897 | return 0; | |
1898 | } | |
ff651cb6 | 1899 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 1900 | |
8e73485c PB |
1901 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
1902 | unsigned long len) | |
1903 | { | |
1904 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1905 | int seg; | |
1906 | int offset = offset_in_page(gpa); | |
1907 | int ret; | |
1908 | ||
1909 | while ((seg = next_segment(len, offset)) != 0) { | |
1910 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
1911 | if (ret < 0) | |
1912 | return ret; | |
1913 | offset = 0; | |
1914 | len -= seg; | |
1915 | data += seg; | |
1916 | ++gfn; | |
1917 | } | |
1918 | return 0; | |
1919 | } | |
1920 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
1921 | ||
5a2d4365 PB |
1922 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
1923 | struct gfn_to_hva_cache *ghc, | |
1924 | gpa_t gpa, unsigned long len) | |
49c7754c | 1925 | { |
49c7754c | 1926 | int offset = offset_in_page(gpa); |
8f964525 AH |
1927 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
1928 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1929 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1930 | gfn_t nr_pages_avail; | |
49c7754c GN |
1931 | |
1932 | ghc->gpa = gpa; | |
1933 | ghc->generation = slots->generation; | |
8f964525 | 1934 | ghc->len = len; |
5a2d4365 | 1935 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); |
ca3f0874 RK |
1936 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL); |
1937 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) { | |
49c7754c | 1938 | ghc->hva += offset; |
8f964525 AH |
1939 | } else { |
1940 | /* | |
1941 | * If the requested region crosses two memslots, we still | |
1942 | * verify that the entire region is valid here. | |
1943 | */ | |
1944 | while (start_gfn <= end_gfn) { | |
076b925d | 1945 | nr_pages_avail = 0; |
5a2d4365 | 1946 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); |
8f964525 AH |
1947 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, |
1948 | &nr_pages_avail); | |
1949 | if (kvm_is_error_hva(ghc->hva)) | |
1950 | return -EFAULT; | |
1951 | start_gfn += nr_pages_avail; | |
1952 | } | |
1953 | /* Use the slow path for cross page reads and writes. */ | |
1954 | ghc->memslot = NULL; | |
1955 | } | |
49c7754c GN |
1956 | return 0; |
1957 | } | |
5a2d4365 | 1958 | |
4e335d9e | 1959 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
1960 | gpa_t gpa, unsigned long len) |
1961 | { | |
4e335d9e | 1962 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
1963 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
1964 | } | |
4e335d9e | 1965 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 1966 | |
4e335d9e PB |
1967 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1968 | void *data, int offset, unsigned long len) | |
49c7754c | 1969 | { |
4e335d9e | 1970 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 1971 | int r; |
4ec6e863 | 1972 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 1973 | |
4ec6e863 | 1974 | BUG_ON(len + offset > ghc->len); |
8f964525 | 1975 | |
49c7754c | 1976 | if (slots->generation != ghc->generation) |
5a2d4365 | 1977 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
1978 | |
1979 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 1980 | return kvm_write_guest(kvm, gpa, data, len); |
49c7754c GN |
1981 | |
1982 | if (kvm_is_error_hva(ghc->hva)) | |
1983 | return -EFAULT; | |
1984 | ||
4ec6e863 | 1985 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
1986 | if (r) |
1987 | return -EFAULT; | |
4ec6e863 | 1988 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
1989 | |
1990 | return 0; | |
1991 | } | |
4e335d9e | 1992 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 1993 | |
4e335d9e PB |
1994 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1995 | void *data, unsigned long len) | |
4ec6e863 | 1996 | { |
4e335d9e | 1997 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 1998 | } |
4e335d9e | 1999 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 2000 | |
4e335d9e PB |
2001 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2002 | void *data, unsigned long len) | |
e03b644f | 2003 | { |
4e335d9e | 2004 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f GN |
2005 | int r; |
2006 | ||
8f964525 AH |
2007 | BUG_ON(len > ghc->len); |
2008 | ||
e03b644f | 2009 | if (slots->generation != ghc->generation) |
5a2d4365 | 2010 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2011 | |
2012 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2013 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
e03b644f GN |
2014 | |
2015 | if (kvm_is_error_hva(ghc->hva)) | |
2016 | return -EFAULT; | |
2017 | ||
2018 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2019 | if (r) | |
2020 | return -EFAULT; | |
2021 | ||
2022 | return 0; | |
2023 | } | |
4e335d9e | 2024 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 2025 | |
195aefde IE |
2026 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
2027 | { | |
8a3caa6d HC |
2028 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
2029 | ||
2030 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
2031 | } |
2032 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2033 | ||
2034 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2035 | { | |
2036 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2037 | int seg; | |
2038 | int offset = offset_in_page(gpa); | |
2039 | int ret; | |
2040 | ||
bfda0e84 | 2041 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
2042 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
2043 | if (ret < 0) | |
2044 | return ret; | |
2045 | offset = 0; | |
2046 | len -= seg; | |
2047 | ++gfn; | |
2048 | } | |
2049 | return 0; | |
2050 | } | |
2051 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2052 | ||
bc009e43 | 2053 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 2054 | gfn_t gfn) |
6aa8b732 | 2055 | { |
7e9d619d RR |
2056 | if (memslot && memslot->dirty_bitmap) { |
2057 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 2058 | |
b74ca3b3 | 2059 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
2060 | } |
2061 | } | |
2062 | ||
49c7754c GN |
2063 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
2064 | { | |
2065 | struct kvm_memory_slot *memslot; | |
2066 | ||
2067 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 2068 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 2069 | } |
2ba9f0d8 | 2070 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 2071 | |
8e73485c PB |
2072 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
2073 | { | |
2074 | struct kvm_memory_slot *memslot; | |
2075 | ||
2076 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2077 | mark_page_dirty_in_slot(memslot, gfn); | |
2078 | } | |
2079 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2080 | ||
20b7035c JS |
2081 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
2082 | { | |
2083 | if (!vcpu->sigset_active) | |
2084 | return; | |
2085 | ||
2086 | /* | |
2087 | * This does a lockless modification of ->real_blocked, which is fine | |
2088 | * because, only current can change ->real_blocked and all readers of | |
2089 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2090 | * of ->blocked. | |
2091 | */ | |
2092 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2093 | } | |
2094 | ||
2095 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2096 | { | |
2097 | if (!vcpu->sigset_active) | |
2098 | return; | |
2099 | ||
2100 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2101 | sigemptyset(¤t->real_blocked); | |
2102 | } | |
2103 | ||
aca6ff29 WL |
2104 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
2105 | { | |
6b6de68c | 2106 | unsigned int old, val, grow; |
aca6ff29 | 2107 | |
2cbd7824 | 2108 | old = val = vcpu->halt_poll_ns; |
6b6de68c | 2109 | grow = READ_ONCE(halt_poll_ns_grow); |
aca6ff29 | 2110 | /* 10us base */ |
6b6de68c | 2111 | if (val == 0 && grow) |
aca6ff29 WL |
2112 | val = 10000; |
2113 | else | |
6b6de68c | 2114 | val *= grow; |
aca6ff29 | 2115 | |
313f636d DM |
2116 | if (val > halt_poll_ns) |
2117 | val = halt_poll_ns; | |
2118 | ||
aca6ff29 | 2119 | vcpu->halt_poll_ns = val; |
2cbd7824 | 2120 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2121 | } |
2122 | ||
2123 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2124 | { | |
6b6de68c | 2125 | unsigned int old, val, shrink; |
aca6ff29 | 2126 | |
2cbd7824 | 2127 | old = val = vcpu->halt_poll_ns; |
6b6de68c CB |
2128 | shrink = READ_ONCE(halt_poll_ns_shrink); |
2129 | if (shrink == 0) | |
aca6ff29 WL |
2130 | val = 0; |
2131 | else | |
6b6de68c | 2132 | val /= shrink; |
aca6ff29 WL |
2133 | |
2134 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 2135 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2136 | } |
2137 | ||
f7819512 PB |
2138 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
2139 | { | |
50c28f21 JS |
2140 | int ret = -EINTR; |
2141 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
2142 | ||
f7819512 PB |
2143 | if (kvm_arch_vcpu_runnable(vcpu)) { |
2144 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 2145 | goto out; |
f7819512 PB |
2146 | } |
2147 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 2148 | goto out; |
f7819512 | 2149 | if (signal_pending(current)) |
50c28f21 | 2150 | goto out; |
f7819512 | 2151 | |
50c28f21 JS |
2152 | ret = 0; |
2153 | out: | |
2154 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2155 | return ret; | |
f7819512 PB |
2156 | } |
2157 | ||
b6958ce4 ED |
2158 | /* |
2159 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2160 | */ | |
8776e519 | 2161 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 2162 | { |
f7819512 | 2163 | ktime_t start, cur; |
8577370f | 2164 | DECLARE_SWAITQUEUE(wait); |
f7819512 | 2165 | bool waited = false; |
aca6ff29 | 2166 | u64 block_ns; |
f7819512 PB |
2167 | |
2168 | start = cur = ktime_get(); | |
19020f8a WL |
2169 | if (vcpu->halt_poll_ns) { |
2170 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); | |
f95ef0cd | 2171 | |
62bea5bf | 2172 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2173 | do { |
2174 | /* | |
2175 | * This sets KVM_REQ_UNHALT if an interrupt | |
2176 | * arrives. | |
2177 | */ | |
2178 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2179 | ++vcpu->stat.halt_successful_poll; | |
3491caf2 CB |
2180 | if (!vcpu_valid_wakeup(vcpu)) |
2181 | ++vcpu->stat.halt_poll_invalid; | |
f7819512 PB |
2182 | goto out; |
2183 | } | |
2184 | cur = ktime_get(); | |
2185 | } while (single_task_running() && ktime_before(cur, stop)); | |
2186 | } | |
e5c239cf | 2187 | |
3217f7c2 CD |
2188 | kvm_arch_vcpu_blocking(vcpu); |
2189 | ||
e5c239cf | 2190 | for (;;) { |
b3dae109 | 2191 | prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
e5c239cf | 2192 | |
f7819512 | 2193 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2194 | break; |
2195 | ||
f7819512 | 2196 | waited = true; |
b6958ce4 | 2197 | schedule(); |
b6958ce4 | 2198 | } |
d3bef15f | 2199 | |
8577370f | 2200 | finish_swait(&vcpu->wq, &wait); |
f7819512 PB |
2201 | cur = ktime_get(); |
2202 | ||
3217f7c2 | 2203 | kvm_arch_vcpu_unblocking(vcpu); |
f7819512 | 2204 | out: |
aca6ff29 WL |
2205 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2206 | ||
2086d320 CB |
2207 | if (!vcpu_valid_wakeup(vcpu)) |
2208 | shrink_halt_poll_ns(vcpu); | |
2209 | else if (halt_poll_ns) { | |
aca6ff29 WL |
2210 | if (block_ns <= vcpu->halt_poll_ns) |
2211 | ; | |
2212 | /* we had a long block, shrink polling */ | |
2086d320 | 2213 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) |
aca6ff29 WL |
2214 | shrink_halt_poll_ns(vcpu); |
2215 | /* we had a short halt and our poll time is too small */ | |
2216 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2217 | block_ns < halt_poll_ns) | |
2218 | grow_halt_poll_ns(vcpu); | |
edb9272f WL |
2219 | } else |
2220 | vcpu->halt_poll_ns = 0; | |
aca6ff29 | 2221 | |
3491caf2 CB |
2222 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
2223 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 2224 | } |
2ba9f0d8 | 2225 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2226 | |
178f02ff | 2227 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 2228 | { |
8577370f | 2229 | struct swait_queue_head *wqp; |
b6d33834 CD |
2230 | |
2231 | wqp = kvm_arch_vcpu_wq(vcpu); | |
5e0018b3 | 2232 | if (swq_has_sleeper(wqp)) { |
b3dae109 | 2233 | swake_up_one(wqp); |
b6d33834 | 2234 | ++vcpu->stat.halt_wakeup; |
178f02ff | 2235 | return true; |
b6d33834 CD |
2236 | } |
2237 | ||
178f02ff | 2238 | return false; |
dd1a4cc1 RK |
2239 | } |
2240 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2241 | ||
0266c894 | 2242 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
2243 | /* |
2244 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2245 | */ | |
2246 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2247 | { | |
2248 | int me; | |
2249 | int cpu = vcpu->cpu; | |
2250 | ||
178f02ff RK |
2251 | if (kvm_vcpu_wake_up(vcpu)) |
2252 | return; | |
2253 | ||
b6d33834 CD |
2254 | me = get_cpu(); |
2255 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2256 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2257 | smp_send_reschedule(cpu); | |
2258 | put_cpu(); | |
2259 | } | |
a20ed54d | 2260 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 2261 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2262 | |
fa93384f | 2263 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2264 | { |
2265 | struct pid *pid; | |
2266 | struct task_struct *task = NULL; | |
fa93384f | 2267 | int ret = 0; |
41628d33 KW |
2268 | |
2269 | rcu_read_lock(); | |
2270 | pid = rcu_dereference(target->pid); | |
2271 | if (pid) | |
27fbe64b | 2272 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2273 | rcu_read_unlock(); |
2274 | if (!task) | |
c45c528e | 2275 | return ret; |
c45c528e | 2276 | ret = yield_to(task, 1); |
41628d33 | 2277 | put_task_struct(task); |
c45c528e R |
2278 | |
2279 | return ret; | |
41628d33 KW |
2280 | } |
2281 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2282 | ||
06e48c51 R |
2283 | /* |
2284 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2285 | * Most eligible candidate to yield is decided by following heuristics: | |
2286 | * | |
2287 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2288 | * (preempted lock holder), indicated by @in_spin_loop. | |
2289 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2290 | * | |
2291 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2292 | * chance last time (mostly it has become eligible now since we have probably | |
2293 | * yielded to lockholder in last iteration. This is done by toggling | |
2294 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2295 | * | |
2296 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2297 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2298 | * burning. Giving priority for a potential lock-holder increases lock | |
2299 | * progress. | |
2300 | * | |
2301 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2302 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2303 | * and continue with next VCPU and so on. | |
2304 | */ | |
7940876e | 2305 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2306 | { |
4a55dd72 | 2307 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2308 | bool eligible; |
2309 | ||
2310 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2311 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2312 | |
2313 | if (vcpu->spin_loop.in_spin_loop) | |
2314 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2315 | ||
2316 | return eligible; | |
4a55dd72 SW |
2317 | #else |
2318 | return true; | |
06e48c51 | 2319 | #endif |
4a55dd72 | 2320 | } |
c45c528e | 2321 | |
199b5763 | 2322 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 2323 | { |
217ece61 RR |
2324 | struct kvm *kvm = me->kvm; |
2325 | struct kvm_vcpu *vcpu; | |
2326 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2327 | int yielded = 0; | |
c45c528e | 2328 | int try = 3; |
217ece61 RR |
2329 | int pass; |
2330 | int i; | |
d255f4f2 | 2331 | |
4c088493 | 2332 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2333 | /* |
2334 | * We boost the priority of a VCPU that is runnable but not | |
2335 | * currently running, because it got preempted by something | |
2336 | * else and called schedule in __vcpu_run. Hopefully that | |
2337 | * VCPU is holding the lock that we need and will release it. | |
2338 | * We approximate round-robin by starting at the last boosted VCPU. | |
2339 | */ | |
c45c528e | 2340 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2341 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2342 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2343 | i = last_boosted_vcpu; |
2344 | continue; | |
2345 | } else if (pass && i > last_boosted_vcpu) | |
2346 | break; | |
6aa7de05 | 2347 | if (!READ_ONCE(vcpu->preempted)) |
7bc7ae25 | 2348 | continue; |
217ece61 RR |
2349 | if (vcpu == me) |
2350 | continue; | |
8577370f | 2351 | if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
217ece61 | 2352 | continue; |
199b5763 LM |
2353 | if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu)) |
2354 | continue; | |
06e48c51 R |
2355 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2356 | continue; | |
c45c528e R |
2357 | |
2358 | yielded = kvm_vcpu_yield_to(vcpu); | |
2359 | if (yielded > 0) { | |
217ece61 | 2360 | kvm->last_boosted_vcpu = i; |
217ece61 | 2361 | break; |
c45c528e R |
2362 | } else if (yielded < 0) { |
2363 | try--; | |
2364 | if (!try) | |
2365 | break; | |
217ece61 | 2366 | } |
217ece61 RR |
2367 | } |
2368 | } | |
4c088493 | 2369 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2370 | |
2371 | /* Ensure vcpu is not eligible during next spinloop */ | |
2372 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2373 | } |
2374 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2375 | ||
1499fa80 | 2376 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 2377 | { |
11bac800 | 2378 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
2379 | struct page *page; |
2380 | ||
e4a533a4 | 2381 | if (vmf->pgoff == 0) |
039576c0 | 2382 | page = virt_to_page(vcpu->run); |
09566765 | 2383 | #ifdef CONFIG_X86 |
e4a533a4 | 2384 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2385 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 2386 | #endif |
4b4357e0 | 2387 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
2388 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
2389 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2390 | #endif |
039576c0 | 2391 | else |
5b1c1493 | 2392 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2393 | get_page(page); |
e4a533a4 | 2394 | vmf->page = page; |
2395 | return 0; | |
9a2bb7f4 AK |
2396 | } |
2397 | ||
f0f37e2f | 2398 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2399 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2400 | }; |
2401 | ||
2402 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2403 | { | |
2404 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2405 | return 0; | |
2406 | } | |
2407 | ||
bccf2150 AK |
2408 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2409 | { | |
2410 | struct kvm_vcpu *vcpu = filp->private_data; | |
2411 | ||
45b5939e | 2412 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
66c0b394 | 2413 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2414 | return 0; |
2415 | } | |
2416 | ||
3d3aab1b | 2417 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2418 | .release = kvm_vcpu_release, |
2419 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 2420 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2421 | .llseek = noop_llseek, |
7ddfd3e0 | 2422 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
2423 | }; |
2424 | ||
2425 | /* | |
2426 | * Allocates an inode for the vcpu. | |
2427 | */ | |
2428 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2429 | { | |
e46b4692 MY |
2430 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
2431 | ||
2432 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
2433 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
2434 | } |
2435 | ||
45b5939e LC |
2436 | static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
2437 | { | |
2438 | char dir_name[ITOA_MAX_LEN * 2]; | |
2439 | int ret; | |
2440 | ||
2441 | if (!kvm_arch_has_vcpu_debugfs()) | |
2442 | return 0; | |
2443 | ||
2444 | if (!debugfs_initialized()) | |
2445 | return 0; | |
2446 | ||
2447 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2448 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
2449 | vcpu->kvm->debugfs_dentry); | |
2450 | if (!vcpu->debugfs_dentry) | |
2451 | return -ENOMEM; | |
2452 | ||
2453 | ret = kvm_arch_create_vcpu_debugfs(vcpu); | |
2454 | if (ret < 0) { | |
2455 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2456 | return ret; | |
2457 | } | |
2458 | ||
2459 | return 0; | |
2460 | } | |
2461 | ||
c5ea7660 AK |
2462 | /* |
2463 | * Creates some virtual cpus. Good luck creating more than one. | |
2464 | */ | |
73880c80 | 2465 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
2466 | { |
2467 | int r; | |
e09fefde | 2468 | struct kvm_vcpu *vcpu; |
c5ea7660 | 2469 | |
0b1b1dfd | 2470 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
2471 | return -EINVAL; |
2472 | ||
6c7caebc PB |
2473 | mutex_lock(&kvm->lock); |
2474 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2475 | mutex_unlock(&kvm->lock); | |
2476 | return -EINVAL; | |
2477 | } | |
2478 | ||
2479 | kvm->created_vcpus++; | |
2480 | mutex_unlock(&kvm->lock); | |
2481 | ||
73880c80 | 2482 | vcpu = kvm_arch_vcpu_create(kvm, id); |
6c7caebc PB |
2483 | if (IS_ERR(vcpu)) { |
2484 | r = PTR_ERR(vcpu); | |
2485 | goto vcpu_decrement; | |
2486 | } | |
c5ea7660 | 2487 | |
15ad7146 AK |
2488 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
2489 | ||
26e5215f AK |
2490 | r = kvm_arch_vcpu_setup(vcpu); |
2491 | if (r) | |
d780592b | 2492 | goto vcpu_destroy; |
26e5215f | 2493 | |
45b5939e LC |
2494 | r = kvm_create_vcpu_debugfs(vcpu); |
2495 | if (r) | |
2496 | goto vcpu_destroy; | |
2497 | ||
11ec2804 | 2498 | mutex_lock(&kvm->lock); |
e09fefde DH |
2499 | if (kvm_get_vcpu_by_id(kvm, id)) { |
2500 | r = -EEXIST; | |
2501 | goto unlock_vcpu_destroy; | |
2502 | } | |
73880c80 GN |
2503 | |
2504 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 2505 | |
fb3f0f51 | 2506 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 2507 | kvm_get_kvm(kvm); |
bccf2150 | 2508 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
2509 | if (r < 0) { |
2510 | kvm_put_kvm(kvm); | |
d780592b | 2511 | goto unlock_vcpu_destroy; |
73880c80 GN |
2512 | } |
2513 | ||
2514 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
dd489240 PB |
2515 | |
2516 | /* | |
2517 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2518 | * before kvm->online_vcpu's incremented value. | |
2519 | */ | |
73880c80 GN |
2520 | smp_wmb(); |
2521 | atomic_inc(&kvm->online_vcpus); | |
2522 | ||
73880c80 | 2523 | mutex_unlock(&kvm->lock); |
42897d86 | 2524 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2525 | return r; |
39c3b86e | 2526 | |
d780592b | 2527 | unlock_vcpu_destroy: |
7d8fece6 | 2528 | mutex_unlock(&kvm->lock); |
45b5939e | 2529 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
d780592b | 2530 | vcpu_destroy: |
d40ccc62 | 2531 | kvm_arch_vcpu_destroy(vcpu); |
6c7caebc PB |
2532 | vcpu_decrement: |
2533 | mutex_lock(&kvm->lock); | |
2534 | kvm->created_vcpus--; | |
2535 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
2536 | return r; |
2537 | } | |
2538 | ||
1961d276 AK |
2539 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2540 | { | |
2541 | if (sigset) { | |
2542 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2543 | vcpu->sigset_active = 1; | |
2544 | vcpu->sigset = *sigset; | |
2545 | } else | |
2546 | vcpu->sigset_active = 0; | |
2547 | return 0; | |
2548 | } | |
2549 | ||
bccf2150 AK |
2550 | static long kvm_vcpu_ioctl(struct file *filp, |
2551 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2552 | { |
bccf2150 | 2553 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2554 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2555 | int r; |
fa3795a7 DH |
2556 | struct kvm_fpu *fpu = NULL; |
2557 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2558 | |
6d4e4c4f AK |
2559 | if (vcpu->kvm->mm != current->mm) |
2560 | return -EIO; | |
2122ff5e | 2561 | |
2ea75be3 DM |
2562 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2563 | return -EINVAL; | |
2564 | ||
2122ff5e | 2565 | /* |
5cb0944c PB |
2566 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
2567 | * execution; mutex_lock() would break them. | |
2122ff5e | 2568 | */ |
5cb0944c PB |
2569 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
2570 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 2571 | return r; |
2122ff5e | 2572 | |
ec7660cc CD |
2573 | if (mutex_lock_killable(&vcpu->mutex)) |
2574 | return -EINTR; | |
6aa8b732 | 2575 | switch (ioctl) { |
0e4524a5 CB |
2576 | case KVM_RUN: { |
2577 | struct pid *oldpid; | |
f0fe5108 AK |
2578 | r = -EINVAL; |
2579 | if (arg) | |
2580 | goto out; | |
0e4524a5 | 2581 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 2582 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 2583 | /* The thread running this VCPU changed. */ |
bd2a6394 | 2584 | struct pid *newpid; |
f95ef0cd | 2585 | |
bd2a6394 CD |
2586 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
2587 | if (r) | |
2588 | break; | |
2589 | ||
2590 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
2591 | rcu_assign_pointer(vcpu->pid, newpid); |
2592 | if (oldpid) | |
2593 | synchronize_rcu(); | |
2594 | put_pid(oldpid); | |
2595 | } | |
b6c7a5dc | 2596 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2597 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2598 | break; |
0e4524a5 | 2599 | } |
6aa8b732 | 2600 | case KVM_GET_REGS: { |
3e4bb3ac | 2601 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2602 | |
3e4bb3ac XZ |
2603 | r = -ENOMEM; |
2604 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2605 | if (!kvm_regs) | |
6aa8b732 | 2606 | goto out; |
3e4bb3ac XZ |
2607 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2608 | if (r) | |
2609 | goto out_free1; | |
6aa8b732 | 2610 | r = -EFAULT; |
3e4bb3ac XZ |
2611 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2612 | goto out_free1; | |
6aa8b732 | 2613 | r = 0; |
3e4bb3ac XZ |
2614 | out_free1: |
2615 | kfree(kvm_regs); | |
6aa8b732 AK |
2616 | break; |
2617 | } | |
2618 | case KVM_SET_REGS: { | |
3e4bb3ac | 2619 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2620 | |
3e4bb3ac | 2621 | r = -ENOMEM; |
ff5c2c03 SL |
2622 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2623 | if (IS_ERR(kvm_regs)) { | |
2624 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2625 | goto out; |
ff5c2c03 | 2626 | } |
3e4bb3ac | 2627 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2628 | kfree(kvm_regs); |
6aa8b732 AK |
2629 | break; |
2630 | } | |
2631 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
2632 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
2633 | r = -ENOMEM; | |
2634 | if (!kvm_sregs) | |
2635 | goto out; | |
2636 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2637 | if (r) |
2638 | goto out; | |
2639 | r = -EFAULT; | |
fa3795a7 | 2640 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2641 | goto out; |
2642 | r = 0; | |
2643 | break; | |
2644 | } | |
2645 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2646 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2647 | if (IS_ERR(kvm_sregs)) { | |
2648 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2649 | kvm_sregs = NULL; |
6aa8b732 | 2650 | goto out; |
ff5c2c03 | 2651 | } |
fa3795a7 | 2652 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2653 | break; |
2654 | } | |
62d9f0db MT |
2655 | case KVM_GET_MP_STATE: { |
2656 | struct kvm_mp_state mp_state; | |
2657 | ||
2658 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2659 | if (r) | |
2660 | goto out; | |
2661 | r = -EFAULT; | |
893bdbf1 | 2662 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
2663 | goto out; |
2664 | r = 0; | |
2665 | break; | |
2666 | } | |
2667 | case KVM_SET_MP_STATE: { | |
2668 | struct kvm_mp_state mp_state; | |
2669 | ||
2670 | r = -EFAULT; | |
893bdbf1 | 2671 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
2672 | goto out; |
2673 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2674 | break; |
2675 | } | |
6aa8b732 AK |
2676 | case KVM_TRANSLATE: { |
2677 | struct kvm_translation tr; | |
2678 | ||
2679 | r = -EFAULT; | |
893bdbf1 | 2680 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 2681 | goto out; |
8b006791 | 2682 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2683 | if (r) |
2684 | goto out; | |
2685 | r = -EFAULT; | |
893bdbf1 | 2686 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
2687 | goto out; |
2688 | r = 0; | |
2689 | break; | |
2690 | } | |
d0bfb940 JK |
2691 | case KVM_SET_GUEST_DEBUG: { |
2692 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2693 | |
2694 | r = -EFAULT; | |
893bdbf1 | 2695 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 2696 | goto out; |
d0bfb940 | 2697 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2698 | break; |
2699 | } | |
1961d276 AK |
2700 | case KVM_SET_SIGNAL_MASK: { |
2701 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2702 | struct kvm_signal_mask kvm_sigmask; | |
2703 | sigset_t sigset, *p; | |
2704 | ||
2705 | p = NULL; | |
2706 | if (argp) { | |
2707 | r = -EFAULT; | |
2708 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2709 | sizeof(kvm_sigmask))) |
1961d276 AK |
2710 | goto out; |
2711 | r = -EINVAL; | |
893bdbf1 | 2712 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
2713 | goto out; |
2714 | r = -EFAULT; | |
2715 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 2716 | sizeof(sigset))) |
1961d276 AK |
2717 | goto out; |
2718 | p = &sigset; | |
2719 | } | |
376d41ff | 2720 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2721 | break; |
2722 | } | |
b8836737 | 2723 | case KVM_GET_FPU: { |
fa3795a7 DH |
2724 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
2725 | r = -ENOMEM; | |
2726 | if (!fpu) | |
2727 | goto out; | |
2728 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2729 | if (r) |
2730 | goto out; | |
2731 | r = -EFAULT; | |
fa3795a7 | 2732 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2733 | goto out; |
2734 | r = 0; | |
2735 | break; | |
2736 | } | |
2737 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2738 | fpu = memdup_user(argp, sizeof(*fpu)); |
2739 | if (IS_ERR(fpu)) { | |
2740 | r = PTR_ERR(fpu); | |
18595411 | 2741 | fpu = NULL; |
b8836737 | 2742 | goto out; |
ff5c2c03 | 2743 | } |
fa3795a7 | 2744 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2745 | break; |
2746 | } | |
bccf2150 | 2747 | default: |
313a3dc7 | 2748 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2749 | } |
2750 | out: | |
ec7660cc | 2751 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
2752 | kfree(fpu); |
2753 | kfree(kvm_sregs); | |
bccf2150 AK |
2754 | return r; |
2755 | } | |
2756 | ||
de8e5d74 | 2757 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
2758 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
2759 | unsigned int ioctl, unsigned long arg) | |
2760 | { | |
2761 | struct kvm_vcpu *vcpu = filp->private_data; | |
2762 | void __user *argp = compat_ptr(arg); | |
2763 | int r; | |
2764 | ||
2765 | if (vcpu->kvm->mm != current->mm) | |
2766 | return -EIO; | |
2767 | ||
2768 | switch (ioctl) { | |
2769 | case KVM_SET_SIGNAL_MASK: { | |
2770 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2771 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
2772 | sigset_t sigset; |
2773 | ||
2774 | if (argp) { | |
2775 | r = -EFAULT; | |
2776 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2777 | sizeof(kvm_sigmask))) |
1dda606c AG |
2778 | goto out; |
2779 | r = -EINVAL; | |
3968cf62 | 2780 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
2781 | goto out; |
2782 | r = -EFAULT; | |
3968cf62 | 2783 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) |
1dda606c | 2784 | goto out; |
760a9a30 AC |
2785 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
2786 | } else | |
2787 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2788 | break; |
2789 | } | |
2790 | default: | |
2791 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2792 | } | |
2793 | ||
2794 | out: | |
2795 | return r; | |
2796 | } | |
2797 | #endif | |
2798 | ||
852b6d57 SW |
2799 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
2800 | int (*accessor)(struct kvm_device *dev, | |
2801 | struct kvm_device_attr *attr), | |
2802 | unsigned long arg) | |
2803 | { | |
2804 | struct kvm_device_attr attr; | |
2805 | ||
2806 | if (!accessor) | |
2807 | return -EPERM; | |
2808 | ||
2809 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2810 | return -EFAULT; | |
2811 | ||
2812 | return accessor(dev, &attr); | |
2813 | } | |
2814 | ||
2815 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2816 | unsigned long arg) | |
2817 | { | |
2818 | struct kvm_device *dev = filp->private_data; | |
2819 | ||
2820 | switch (ioctl) { | |
2821 | case KVM_SET_DEVICE_ATTR: | |
2822 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2823 | case KVM_GET_DEVICE_ATTR: | |
2824 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2825 | case KVM_HAS_DEVICE_ATTR: | |
2826 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2827 | default: | |
2828 | if (dev->ops->ioctl) | |
2829 | return dev->ops->ioctl(dev, ioctl, arg); | |
2830 | ||
2831 | return -ENOTTY; | |
2832 | } | |
2833 | } | |
2834 | ||
852b6d57 SW |
2835 | static int kvm_device_release(struct inode *inode, struct file *filp) |
2836 | { | |
2837 | struct kvm_device *dev = filp->private_data; | |
2838 | struct kvm *kvm = dev->kvm; | |
2839 | ||
852b6d57 SW |
2840 | kvm_put_kvm(kvm); |
2841 | return 0; | |
2842 | } | |
2843 | ||
2844 | static const struct file_operations kvm_device_fops = { | |
2845 | .unlocked_ioctl = kvm_device_ioctl, | |
2846 | .release = kvm_device_release, | |
7ddfd3e0 | 2847 | KVM_COMPAT(kvm_device_ioctl), |
852b6d57 SW |
2848 | }; |
2849 | ||
2850 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2851 | { | |
2852 | if (filp->f_op != &kvm_device_fops) | |
2853 | return NULL; | |
2854 | ||
2855 | return filp->private_data; | |
2856 | } | |
2857 | ||
d60eacb0 | 2858 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 2859 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
2860 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
2861 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 2862 | #endif |
d60eacb0 WD |
2863 | }; |
2864 | ||
2865 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2866 | { | |
2867 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2868 | return -ENOSPC; | |
2869 | ||
2870 | if (kvm_device_ops_table[type] != NULL) | |
2871 | return -EEXIST; | |
2872 | ||
2873 | kvm_device_ops_table[type] = ops; | |
2874 | return 0; | |
2875 | } | |
2876 | ||
571ee1b6 WL |
2877 | void kvm_unregister_device_ops(u32 type) |
2878 | { | |
2879 | if (kvm_device_ops_table[type] != NULL) | |
2880 | kvm_device_ops_table[type] = NULL; | |
2881 | } | |
2882 | ||
852b6d57 SW |
2883 | static int kvm_ioctl_create_device(struct kvm *kvm, |
2884 | struct kvm_create_device *cd) | |
2885 | { | |
2886 | struct kvm_device_ops *ops = NULL; | |
2887 | struct kvm_device *dev; | |
2888 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2889 | int ret; | |
2890 | ||
d60eacb0 WD |
2891 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
2892 | return -ENODEV; | |
2893 | ||
2894 | ops = kvm_device_ops_table[cd->type]; | |
2895 | if (ops == NULL) | |
852b6d57 | 2896 | return -ENODEV; |
852b6d57 SW |
2897 | |
2898 | if (test) | |
2899 | return 0; | |
2900 | ||
2901 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2902 | if (!dev) | |
2903 | return -ENOMEM; | |
2904 | ||
2905 | dev->ops = ops; | |
2906 | dev->kvm = kvm; | |
852b6d57 | 2907 | |
a28ebea2 | 2908 | mutex_lock(&kvm->lock); |
852b6d57 SW |
2909 | ret = ops->create(dev, cd->type); |
2910 | if (ret < 0) { | |
a28ebea2 | 2911 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
2912 | kfree(dev); |
2913 | return ret; | |
2914 | } | |
a28ebea2 CD |
2915 | list_add(&dev->vm_node, &kvm->devices); |
2916 | mutex_unlock(&kvm->lock); | |
852b6d57 | 2917 | |
023e9fdd CD |
2918 | if (ops->init) |
2919 | ops->init(dev); | |
2920 | ||
24009b05 | 2921 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 2922 | if (ret < 0) { |
a28ebea2 CD |
2923 | mutex_lock(&kvm->lock); |
2924 | list_del(&dev->vm_node); | |
2925 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 2926 | ops->destroy(dev); |
852b6d57 SW |
2927 | return ret; |
2928 | } | |
2929 | ||
2930 | kvm_get_kvm(kvm); | |
2931 | cd->fd = ret; | |
2932 | return 0; | |
2933 | } | |
2934 | ||
92b591a4 AG |
2935 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
2936 | { | |
2937 | switch (arg) { | |
2938 | case KVM_CAP_USER_MEMORY: | |
2939 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
2940 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
2941 | case KVM_CAP_INTERNAL_ERROR_DATA: |
2942 | #ifdef CONFIG_HAVE_KVM_MSI | |
2943 | case KVM_CAP_SIGNAL_MSI: | |
2944 | #endif | |
297e2105 | 2945 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 2946 | case KVM_CAP_IRQFD: |
92b591a4 AG |
2947 | case KVM_CAP_IRQFD_RESAMPLE: |
2948 | #endif | |
e9ea5069 | 2949 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 AG |
2950 | case KVM_CAP_CHECK_EXTENSION_VM: |
2951 | return 1; | |
4b4357e0 | 2952 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
2953 | case KVM_CAP_COALESCED_MMIO: |
2954 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
2955 | case KVM_CAP_COALESCED_PIO: |
2956 | return 1; | |
30422558 | 2957 | #endif |
92b591a4 AG |
2958 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
2959 | case KVM_CAP_IRQ_ROUTING: | |
2960 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
2961 | #endif |
2962 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
2963 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
2964 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 2965 | #endif |
0b1b1dfd GK |
2966 | case KVM_CAP_MAX_VCPU_ID: |
2967 | return KVM_MAX_VCPU_ID; | |
92b591a4 AG |
2968 | default: |
2969 | break; | |
2970 | } | |
2971 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
2972 | } | |
2973 | ||
bccf2150 AK |
2974 | static long kvm_vm_ioctl(struct file *filp, |
2975 | unsigned int ioctl, unsigned long arg) | |
2976 | { | |
2977 | struct kvm *kvm = filp->private_data; | |
2978 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 2979 | int r; |
bccf2150 | 2980 | |
6d4e4c4f AK |
2981 | if (kvm->mm != current->mm) |
2982 | return -EIO; | |
bccf2150 AK |
2983 | switch (ioctl) { |
2984 | case KVM_CREATE_VCPU: | |
2985 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 2986 | break; |
6fc138d2 IE |
2987 | case KVM_SET_USER_MEMORY_REGION: { |
2988 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2989 | ||
2990 | r = -EFAULT; | |
2991 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 2992 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
2993 | goto out; |
2994 | ||
47ae31e2 | 2995 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
2996 | break; |
2997 | } | |
2998 | case KVM_GET_DIRTY_LOG: { | |
2999 | struct kvm_dirty_log log; | |
3000 | ||
3001 | r = -EFAULT; | |
893bdbf1 | 3002 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 3003 | goto out; |
2c6f5df9 | 3004 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
3005 | break; |
3006 | } | |
4b4357e0 | 3007 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3008 | case KVM_REGISTER_COALESCED_MMIO: { |
3009 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3010 | |
5f94c174 | 3011 | r = -EFAULT; |
893bdbf1 | 3012 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3013 | goto out; |
5f94c174 | 3014 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3015 | break; |
3016 | } | |
3017 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3018 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3019 | |
5f94c174 | 3020 | r = -EFAULT; |
893bdbf1 | 3021 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3022 | goto out; |
5f94c174 | 3023 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3024 | break; |
3025 | } | |
3026 | #endif | |
721eecbf GH |
3027 | case KVM_IRQFD: { |
3028 | struct kvm_irqfd data; | |
3029 | ||
3030 | r = -EFAULT; | |
893bdbf1 | 3031 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 3032 | goto out; |
d4db2935 | 3033 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
3034 | break; |
3035 | } | |
d34e6b17 GH |
3036 | case KVM_IOEVENTFD: { |
3037 | struct kvm_ioeventfd data; | |
3038 | ||
3039 | r = -EFAULT; | |
893bdbf1 | 3040 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
3041 | goto out; |
3042 | r = kvm_ioeventfd(kvm, &data); | |
3043 | break; | |
3044 | } | |
07975ad3 JK |
3045 | #ifdef CONFIG_HAVE_KVM_MSI |
3046 | case KVM_SIGNAL_MSI: { | |
3047 | struct kvm_msi msi; | |
3048 | ||
3049 | r = -EFAULT; | |
893bdbf1 | 3050 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
3051 | goto out; |
3052 | r = kvm_send_userspace_msi(kvm, &msi); | |
3053 | break; | |
3054 | } | |
23d43cf9 CD |
3055 | #endif |
3056 | #ifdef __KVM_HAVE_IRQ_LINE | |
3057 | case KVM_IRQ_LINE_STATUS: | |
3058 | case KVM_IRQ_LINE: { | |
3059 | struct kvm_irq_level irq_event; | |
3060 | ||
3061 | r = -EFAULT; | |
893bdbf1 | 3062 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
3063 | goto out; |
3064 | ||
aa2fbe6d YZ |
3065 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
3066 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
3067 | if (r) |
3068 | goto out; | |
3069 | ||
3070 | r = -EFAULT; | |
3071 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 3072 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
3073 | goto out; |
3074 | } | |
3075 | ||
3076 | r = 0; | |
3077 | break; | |
3078 | } | |
73880c80 | 3079 | #endif |
aa8d5944 AG |
3080 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3081 | case KVM_SET_GSI_ROUTING: { | |
3082 | struct kvm_irq_routing routing; | |
3083 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 3084 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
3085 | |
3086 | r = -EFAULT; | |
3087 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3088 | goto out; | |
3089 | r = -EINVAL; | |
5c0aea0e DH |
3090 | if (!kvm_arch_can_set_irq_routing(kvm)) |
3091 | goto out; | |
caf1ff26 | 3092 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
3093 | goto out; |
3094 | if (routing.flags) | |
3095 | goto out; | |
f8c1b85b PB |
3096 | if (routing.nr) { |
3097 | r = -ENOMEM; | |
42bc47b3 KC |
3098 | entries = vmalloc(array_size(sizeof(*entries), |
3099 | routing.nr)); | |
f8c1b85b PB |
3100 | if (!entries) |
3101 | goto out; | |
3102 | r = -EFAULT; | |
3103 | urouting = argp; | |
3104 | if (copy_from_user(entries, urouting->entries, | |
3105 | routing.nr * sizeof(*entries))) | |
3106 | goto out_free_irq_routing; | |
3107 | } | |
aa8d5944 AG |
3108 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
3109 | routing.flags); | |
a642a175 | 3110 | out_free_irq_routing: |
aa8d5944 AG |
3111 | vfree(entries); |
3112 | break; | |
3113 | } | |
3114 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
3115 | case KVM_CREATE_DEVICE: { |
3116 | struct kvm_create_device cd; | |
3117 | ||
3118 | r = -EFAULT; | |
3119 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3120 | goto out; | |
3121 | ||
3122 | r = kvm_ioctl_create_device(kvm, &cd); | |
3123 | if (r) | |
3124 | goto out; | |
3125 | ||
3126 | r = -EFAULT; | |
3127 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3128 | goto out; | |
3129 | ||
3130 | r = 0; | |
3131 | break; | |
3132 | } | |
92b591a4 AG |
3133 | case KVM_CHECK_EXTENSION: |
3134 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3135 | break; | |
f17abe9a | 3136 | default: |
1fe779f8 | 3137 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
3138 | } |
3139 | out: | |
3140 | return r; | |
3141 | } | |
3142 | ||
de8e5d74 | 3143 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
3144 | struct compat_kvm_dirty_log { |
3145 | __u32 slot; | |
3146 | __u32 padding1; | |
3147 | union { | |
3148 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3149 | __u64 padding2; | |
3150 | }; | |
3151 | }; | |
3152 | ||
3153 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3154 | unsigned int ioctl, unsigned long arg) | |
3155 | { | |
3156 | struct kvm *kvm = filp->private_data; | |
3157 | int r; | |
3158 | ||
3159 | if (kvm->mm != current->mm) | |
3160 | return -EIO; | |
3161 | switch (ioctl) { | |
3162 | case KVM_GET_DIRTY_LOG: { | |
3163 | struct compat_kvm_dirty_log compat_log; | |
3164 | struct kvm_dirty_log log; | |
3165 | ||
6ff5894c AB |
3166 | if (copy_from_user(&compat_log, (void __user *)arg, |
3167 | sizeof(compat_log))) | |
f6a3b168 | 3168 | return -EFAULT; |
6ff5894c AB |
3169 | log.slot = compat_log.slot; |
3170 | log.padding1 = compat_log.padding1; | |
3171 | log.padding2 = compat_log.padding2; | |
3172 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3173 | ||
3174 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
3175 | break; |
3176 | } | |
3177 | default: | |
3178 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3179 | } | |
6ff5894c AB |
3180 | return r; |
3181 | } | |
3182 | #endif | |
3183 | ||
3d3aab1b | 3184 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
3185 | .release = kvm_vm_release, |
3186 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 3187 | .llseek = noop_llseek, |
7ddfd3e0 | 3188 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
3189 | }; |
3190 | ||
e08b9637 | 3191 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 3192 | { |
aac87636 | 3193 | int r; |
f17abe9a | 3194 | struct kvm *kvm; |
506cfba9 | 3195 | struct file *file; |
f17abe9a | 3196 | |
e08b9637 | 3197 | kvm = kvm_create_vm(type); |
d6d28168 AK |
3198 | if (IS_ERR(kvm)) |
3199 | return PTR_ERR(kvm); | |
4b4357e0 | 3200 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 3201 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
3202 | if (r < 0) |
3203 | goto put_kvm; | |
6ce5a090 | 3204 | #endif |
506cfba9 | 3205 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
3206 | if (r < 0) |
3207 | goto put_kvm; | |
3208 | ||
506cfba9 AV |
3209 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
3210 | if (IS_ERR(file)) { | |
3211 | put_unused_fd(r); | |
78588335 ME |
3212 | r = PTR_ERR(file); |
3213 | goto put_kvm; | |
506cfba9 | 3214 | } |
536a6f88 | 3215 | |
525df861 PB |
3216 | /* |
3217 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3218 | * already set, with ->release() being kvm_vm_release(). In error | |
3219 | * cases it will be called by the final fput(file) and will take | |
3220 | * care of doing kvm_put_kvm(kvm). | |
3221 | */ | |
536a6f88 | 3222 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
3223 | put_unused_fd(r); |
3224 | fput(file); | |
536a6f88 JF |
3225 | return -ENOMEM; |
3226 | } | |
286de8f6 | 3227 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 3228 | |
506cfba9 | 3229 | fd_install(r, file); |
aac87636 | 3230 | return r; |
78588335 ME |
3231 | |
3232 | put_kvm: | |
3233 | kvm_put_kvm(kvm); | |
3234 | return r; | |
f17abe9a AK |
3235 | } |
3236 | ||
3237 | static long kvm_dev_ioctl(struct file *filp, | |
3238 | unsigned int ioctl, unsigned long arg) | |
3239 | { | |
07c45a36 | 3240 | long r = -EINVAL; |
f17abe9a AK |
3241 | |
3242 | switch (ioctl) { | |
3243 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
3244 | if (arg) |
3245 | goto out; | |
f17abe9a AK |
3246 | r = KVM_API_VERSION; |
3247 | break; | |
3248 | case KVM_CREATE_VM: | |
e08b9637 | 3249 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 3250 | break; |
018d00d2 | 3251 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 3252 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 3253 | break; |
07c45a36 | 3254 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
3255 | if (arg) |
3256 | goto out; | |
adb1ff46 AK |
3257 | r = PAGE_SIZE; /* struct kvm_run */ |
3258 | #ifdef CONFIG_X86 | |
3259 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 3260 | #endif |
4b4357e0 | 3261 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 3262 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 3263 | #endif |
07c45a36 | 3264 | break; |
d4c9ff2d FEL |
3265 | case KVM_TRACE_ENABLE: |
3266 | case KVM_TRACE_PAUSE: | |
3267 | case KVM_TRACE_DISABLE: | |
2023a29c | 3268 | r = -EOPNOTSUPP; |
d4c9ff2d | 3269 | break; |
6aa8b732 | 3270 | default: |
043405e1 | 3271 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3272 | } |
3273 | out: | |
3274 | return r; | |
3275 | } | |
3276 | ||
6aa8b732 | 3277 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 3278 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 3279 | .llseek = noop_llseek, |
7ddfd3e0 | 3280 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
3281 | }; |
3282 | ||
3283 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3284 | KVM_MINOR, |
6aa8b732 AK |
3285 | "kvm", |
3286 | &kvm_chardev_ops, | |
3287 | }; | |
3288 | ||
75b7127c | 3289 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3290 | { |
3291 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3292 | int r; |
1b6c0168 | 3293 | |
7f59f492 | 3294 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3295 | return; |
10474ae8 | 3296 | |
7f59f492 | 3297 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3298 | |
13a34e06 | 3299 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3300 | |
3301 | if (r) { | |
3302 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3303 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3304 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3305 | } |
1b6c0168 AK |
3306 | } |
3307 | ||
8c18b2d2 | 3308 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 3309 | { |
4a937f96 | 3310 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3311 | if (kvm_usage_count) |
3312 | hardware_enable_nolock(NULL); | |
4a937f96 | 3313 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3314 | return 0; |
75b7127c TY |
3315 | } |
3316 | ||
3317 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3318 | { |
3319 | int cpu = raw_smp_processor_id(); | |
3320 | ||
7f59f492 | 3321 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3322 | return; |
7f59f492 | 3323 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3324 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3325 | } |
3326 | ||
8c18b2d2 | 3327 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 3328 | { |
4a937f96 | 3329 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3330 | if (kvm_usage_count) |
3331 | hardware_disable_nolock(NULL); | |
4a937f96 | 3332 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3333 | return 0; |
75b7127c TY |
3334 | } |
3335 | ||
10474ae8 AG |
3336 | static void hardware_disable_all_nolock(void) |
3337 | { | |
3338 | BUG_ON(!kvm_usage_count); | |
3339 | ||
3340 | kvm_usage_count--; | |
3341 | if (!kvm_usage_count) | |
75b7127c | 3342 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3343 | } |
3344 | ||
3345 | static void hardware_disable_all(void) | |
3346 | { | |
4a937f96 | 3347 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3348 | hardware_disable_all_nolock(); |
4a937f96 | 3349 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3350 | } |
3351 | ||
3352 | static int hardware_enable_all(void) | |
3353 | { | |
3354 | int r = 0; | |
3355 | ||
4a937f96 | 3356 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3357 | |
3358 | kvm_usage_count++; | |
3359 | if (kvm_usage_count == 1) { | |
3360 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3361 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3362 | |
3363 | if (atomic_read(&hardware_enable_failed)) { | |
3364 | hardware_disable_all_nolock(); | |
3365 | r = -EBUSY; | |
3366 | } | |
3367 | } | |
3368 | ||
4a937f96 | 3369 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3370 | |
3371 | return r; | |
3372 | } | |
3373 | ||
9a2b85c6 | 3374 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 3375 | void *v) |
9a2b85c6 | 3376 | { |
8e1c1815 SY |
3377 | /* |
3378 | * Some (well, at least mine) BIOSes hang on reboot if | |
3379 | * in vmx root mode. | |
3380 | * | |
3381 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3382 | */ | |
1170adc6 | 3383 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 3384 | kvm_rebooting = true; |
75b7127c | 3385 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
3386 | return NOTIFY_OK; |
3387 | } | |
3388 | ||
3389 | static struct notifier_block kvm_reboot_notifier = { | |
3390 | .notifier_call = kvm_reboot, | |
3391 | .priority = 0, | |
3392 | }; | |
3393 | ||
e93f8a0f | 3394 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
3395 | { |
3396 | int i; | |
3397 | ||
3398 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 3399 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
3400 | |
3401 | kvm_iodevice_destructor(pos); | |
3402 | } | |
e93f8a0f | 3403 | kfree(bus); |
2eeb2e94 GH |
3404 | } |
3405 | ||
c21fbff1 | 3406 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 3407 | const struct kvm_io_range *r2) |
743eeb0b | 3408 | { |
8f4216c7 JW |
3409 | gpa_t addr1 = r1->addr; |
3410 | gpa_t addr2 = r2->addr; | |
3411 | ||
3412 | if (addr1 < addr2) | |
743eeb0b | 3413 | return -1; |
8f4216c7 JW |
3414 | |
3415 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3416 | * accept any overlapping write. Any order is acceptable for | |
3417 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3418 | * we process all of them. | |
3419 | */ | |
3420 | if (r2->len) { | |
3421 | addr1 += r1->len; | |
3422 | addr2 += r2->len; | |
3423 | } | |
3424 | ||
3425 | if (addr1 > addr2) | |
743eeb0b | 3426 | return 1; |
8f4216c7 | 3427 | |
743eeb0b SL |
3428 | return 0; |
3429 | } | |
3430 | ||
a343c9b7 PB |
3431 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
3432 | { | |
c21fbff1 | 3433 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
3434 | } |
3435 | ||
39369f7a | 3436 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
3437 | gpa_t addr, int len) |
3438 | { | |
3439 | struct kvm_io_range *range, key; | |
3440 | int off; | |
3441 | ||
3442 | key = (struct kvm_io_range) { | |
3443 | .addr = addr, | |
3444 | .len = len, | |
3445 | }; | |
3446 | ||
3447 | range = bsearch(&key, bus->range, bus->dev_count, | |
3448 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3449 | if (range == NULL) | |
3450 | return -ENOENT; | |
3451 | ||
3452 | off = range - bus->range; | |
3453 | ||
c21fbff1 | 3454 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
3455 | off--; |
3456 | ||
3457 | return off; | |
3458 | } | |
3459 | ||
e32edf4f | 3460 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
3461 | struct kvm_io_range *range, const void *val) |
3462 | { | |
3463 | int idx; | |
3464 | ||
3465 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3466 | if (idx < 0) | |
3467 | return -EOPNOTSUPP; | |
3468 | ||
3469 | while (idx < bus->dev_count && | |
c21fbff1 | 3470 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3471 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3472 | range->len, val)) |
3473 | return idx; | |
3474 | idx++; | |
3475 | } | |
3476 | ||
3477 | return -EOPNOTSUPP; | |
3478 | } | |
3479 | ||
bda9020e | 3480 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 3481 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 3482 | int len, const void *val) |
2eeb2e94 | 3483 | { |
90d83dc3 | 3484 | struct kvm_io_bus *bus; |
743eeb0b | 3485 | struct kvm_io_range range; |
126a5af5 | 3486 | int r; |
743eeb0b SL |
3487 | |
3488 | range = (struct kvm_io_range) { | |
3489 | .addr = addr, | |
3490 | .len = len, | |
3491 | }; | |
90d83dc3 | 3492 | |
e32edf4f | 3493 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3494 | if (!bus) |
3495 | return -ENOMEM; | |
e32edf4f | 3496 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3497 | return r < 0 ? r : 0; |
3498 | } | |
3499 | ||
3500 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
3501 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
3502 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
3503 | { |
3504 | struct kvm_io_bus *bus; | |
3505 | struct kvm_io_range range; | |
3506 | ||
3507 | range = (struct kvm_io_range) { | |
3508 | .addr = addr, | |
3509 | .len = len, | |
3510 | }; | |
3511 | ||
e32edf4f | 3512 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3513 | if (!bus) |
3514 | return -ENOMEM; | |
126a5af5 CH |
3515 | |
3516 | /* First try the device referenced by cookie. */ | |
3517 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 3518 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 3519 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
3520 | val)) |
3521 | return cookie; | |
3522 | ||
3523 | /* | |
3524 | * cookie contained garbage; fall back to search and return the | |
3525 | * correct cookie value. | |
3526 | */ | |
e32edf4f | 3527 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3528 | } |
3529 | ||
e32edf4f NN |
3530 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
3531 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
3532 | { |
3533 | int idx; | |
3534 | ||
3535 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
3536 | if (idx < 0) |
3537 | return -EOPNOTSUPP; | |
3538 | ||
3539 | while (idx < bus->dev_count && | |
c21fbff1 | 3540 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3541 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3542 | range->len, val)) |
3543 | return idx; | |
743eeb0b SL |
3544 | idx++; |
3545 | } | |
3546 | ||
bda9020e MT |
3547 | return -EOPNOTSUPP; |
3548 | } | |
68c3b4d1 | 3549 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
2eeb2e94 | 3550 | |
bda9020e | 3551 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 3552 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 3553 | int len, void *val) |
bda9020e | 3554 | { |
90d83dc3 | 3555 | struct kvm_io_bus *bus; |
743eeb0b | 3556 | struct kvm_io_range range; |
126a5af5 | 3557 | int r; |
743eeb0b SL |
3558 | |
3559 | range = (struct kvm_io_range) { | |
3560 | .addr = addr, | |
3561 | .len = len, | |
3562 | }; | |
e93f8a0f | 3563 | |
e32edf4f | 3564 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3565 | if (!bus) |
3566 | return -ENOMEM; | |
e32edf4f | 3567 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
3568 | return r < 0 ? r : 0; |
3569 | } | |
743eeb0b | 3570 | |
2eeb2e94 | 3571 | |
79fac95e | 3572 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3573 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3574 | int len, struct kvm_io_device *dev) | |
6c474694 | 3575 | { |
d4c67a7a | 3576 | int i; |
e93f8a0f | 3577 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 3578 | struct kvm_io_range range; |
090b7aff | 3579 | |
4a12f951 | 3580 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
3581 | if (!bus) |
3582 | return -ENOMEM; | |
3583 | ||
6ea34c9b AK |
3584 | /* exclude ioeventfd which is limited by maximum fd */ |
3585 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3586 | return -ENOSPC; |
2eeb2e94 | 3587 | |
d3febddd | 3588 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
a1300716 | 3589 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
e93f8a0f MT |
3590 | if (!new_bus) |
3591 | return -ENOMEM; | |
d4c67a7a GH |
3592 | |
3593 | range = (struct kvm_io_range) { | |
3594 | .addr = addr, | |
3595 | .len = len, | |
3596 | .dev = dev, | |
3597 | }; | |
3598 | ||
3599 | for (i = 0; i < bus->dev_count; i++) | |
3600 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
3601 | break; | |
3602 | ||
3603 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3604 | new_bus->dev_count++; | |
3605 | new_bus->range[i] = range; | |
3606 | memcpy(new_bus->range + i + 1, bus->range + i, | |
3607 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3608 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3609 | synchronize_srcu_expedited(&kvm->srcu); | |
3610 | kfree(bus); | |
090b7aff GH |
3611 | |
3612 | return 0; | |
3613 | } | |
3614 | ||
79fac95e | 3615 | /* Caller must hold slots_lock. */ |
90db1043 DH |
3616 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3617 | struct kvm_io_device *dev) | |
090b7aff | 3618 | { |
90db1043 | 3619 | int i; |
e93f8a0f | 3620 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3621 | |
4a12f951 | 3622 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 3623 | if (!bus) |
90db1043 | 3624 | return; |
df630b8c | 3625 | |
a1300716 AK |
3626 | for (i = 0; i < bus->dev_count; i++) |
3627 | if (bus->range[i].dev == dev) { | |
090b7aff GH |
3628 | break; |
3629 | } | |
e93f8a0f | 3630 | |
90db1043 DH |
3631 | if (i == bus->dev_count) |
3632 | return; | |
a1300716 | 3633 | |
d3febddd | 3634 | new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) * |
a1300716 | 3635 | sizeof(struct kvm_io_range)), GFP_KERNEL); |
90db1043 DH |
3636 | if (!new_bus) { |
3637 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
3638 | goto broken; | |
3639 | } | |
a1300716 AK |
3640 | |
3641 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3642 | new_bus->dev_count--; | |
3643 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3644 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f | 3645 | |
90db1043 | 3646 | broken: |
e93f8a0f MT |
3647 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3648 | synchronize_srcu_expedited(&kvm->srcu); | |
3649 | kfree(bus); | |
90db1043 | 3650 | return; |
2eeb2e94 GH |
3651 | } |
3652 | ||
8a39d006 AP |
3653 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3654 | gpa_t addr) | |
3655 | { | |
3656 | struct kvm_io_bus *bus; | |
3657 | int dev_idx, srcu_idx; | |
3658 | struct kvm_io_device *iodev = NULL; | |
3659 | ||
3660 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3661 | ||
3662 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
3663 | if (!bus) |
3664 | goto out_unlock; | |
8a39d006 AP |
3665 | |
3666 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3667 | if (dev_idx < 0) | |
3668 | goto out_unlock; | |
3669 | ||
3670 | iodev = bus->range[dev_idx].dev; | |
3671 | ||
3672 | out_unlock: | |
3673 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3674 | ||
3675 | return iodev; | |
3676 | } | |
3677 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
3678 | ||
536a6f88 JF |
3679 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
3680 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
3681 | const char *fmt) | |
3682 | { | |
3683 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3684 | inode->i_private; | |
3685 | ||
3686 | /* The debugfs files are a reference to the kvm struct which | |
3687 | * is still valid when kvm_destroy_vm is called. | |
3688 | * To avoid the race between open and the removal of the debugfs | |
3689 | * directory we test against the users count. | |
3690 | */ | |
e3736c3e | 3691 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) |
536a6f88 JF |
3692 | return -ENOENT; |
3693 | ||
3694 | if (simple_attr_open(inode, file, get, set, fmt)) { | |
3695 | kvm_put_kvm(stat_data->kvm); | |
3696 | return -ENOMEM; | |
3697 | } | |
3698 | ||
3699 | return 0; | |
3700 | } | |
3701 | ||
3702 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
3703 | { | |
3704 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3705 | inode->i_private; | |
3706 | ||
3707 | simple_attr_release(inode, file); | |
3708 | kvm_put_kvm(stat_data->kvm); | |
3709 | ||
3710 | return 0; | |
3711 | } | |
3712 | ||
3713 | static int vm_stat_get_per_vm(void *data, u64 *val) | |
3714 | { | |
3715 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3716 | ||
8a7e75d4 | 3717 | *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset); |
536a6f88 JF |
3718 | |
3719 | return 0; | |
3720 | } | |
3721 | ||
ce35ef27 SJS |
3722 | static int vm_stat_clear_per_vm(void *data, u64 val) |
3723 | { | |
3724 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3725 | ||
3726 | if (val) | |
3727 | return -EINVAL; | |
3728 | ||
3729 | *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0; | |
3730 | ||
3731 | return 0; | |
3732 | } | |
3733 | ||
536a6f88 JF |
3734 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) |
3735 | { | |
3736 | __simple_attr_check_format("%llu\n", 0ull); | |
3737 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, | |
ce35ef27 | 3738 | vm_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
3739 | } |
3740 | ||
3741 | static const struct file_operations vm_stat_get_per_vm_fops = { | |
3742 | .owner = THIS_MODULE, | |
3743 | .open = vm_stat_get_per_vm_open, | |
3744 | .release = kvm_debugfs_release, | |
3745 | .read = simple_attr_read, | |
3746 | .write = simple_attr_write, | |
3bed8888 | 3747 | .llseek = no_llseek, |
536a6f88 JF |
3748 | }; |
3749 | ||
3750 | static int vcpu_stat_get_per_vm(void *data, u64 *val) | |
3751 | { | |
3752 | int i; | |
3753 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3754 | struct kvm_vcpu *vcpu; | |
3755 | ||
3756 | *val = 0; | |
3757 | ||
3758 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
8a7e75d4 | 3759 | *val += *(u64 *)((void *)vcpu + stat_data->offset); |
536a6f88 JF |
3760 | |
3761 | return 0; | |
3762 | } | |
3763 | ||
ce35ef27 SJS |
3764 | static int vcpu_stat_clear_per_vm(void *data, u64 val) |
3765 | { | |
3766 | int i; | |
3767 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3768 | struct kvm_vcpu *vcpu; | |
3769 | ||
3770 | if (val) | |
3771 | return -EINVAL; | |
3772 | ||
3773 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3774 | *(u64 *)((void *)vcpu + stat_data->offset) = 0; | |
3775 | ||
3776 | return 0; | |
3777 | } | |
3778 | ||
536a6f88 JF |
3779 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) |
3780 | { | |
3781 | __simple_attr_check_format("%llu\n", 0ull); | |
3782 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, | |
ce35ef27 | 3783 | vcpu_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
3784 | } |
3785 | ||
3786 | static const struct file_operations vcpu_stat_get_per_vm_fops = { | |
3787 | .owner = THIS_MODULE, | |
3788 | .open = vcpu_stat_get_per_vm_open, | |
3789 | .release = kvm_debugfs_release, | |
3790 | .read = simple_attr_read, | |
3791 | .write = simple_attr_write, | |
3bed8888 | 3792 | .llseek = no_llseek, |
536a6f88 JF |
3793 | }; |
3794 | ||
3795 | static const struct file_operations *stat_fops_per_vm[] = { | |
3796 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, | |
3797 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, | |
3798 | }; | |
3799 | ||
8b88b099 | 3800 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
3801 | { |
3802 | unsigned offset = (long)_offset; | |
ba1389b7 | 3803 | struct kvm *kvm; |
536a6f88 JF |
3804 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
3805 | u64 tmp_val; | |
ba1389b7 | 3806 | |
8b88b099 | 3807 | *val = 0; |
2f303b74 | 3808 | spin_lock(&kvm_lock); |
536a6f88 JF |
3809 | list_for_each_entry(kvm, &vm_list, vm_list) { |
3810 | stat_tmp.kvm = kvm; | |
3811 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3812 | *val += tmp_val; | |
3813 | } | |
2f303b74 | 3814 | spin_unlock(&kvm_lock); |
8b88b099 | 3815 | return 0; |
ba1389b7 AK |
3816 | } |
3817 | ||
ce35ef27 SJS |
3818 | static int vm_stat_clear(void *_offset, u64 val) |
3819 | { | |
3820 | unsigned offset = (long)_offset; | |
3821 | struct kvm *kvm; | |
3822 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3823 | ||
3824 | if (val) | |
3825 | return -EINVAL; | |
3826 | ||
3827 | spin_lock(&kvm_lock); | |
3828 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3829 | stat_tmp.kvm = kvm; | |
3830 | vm_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3831 | } | |
3832 | spin_unlock(&kvm_lock); | |
3833 | ||
3834 | return 0; | |
3835 | } | |
3836 | ||
3837 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
ba1389b7 | 3838 | |
8b88b099 | 3839 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
3840 | { |
3841 | unsigned offset = (long)_offset; | |
1165f5fe | 3842 | struct kvm *kvm; |
536a6f88 JF |
3843 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
3844 | u64 tmp_val; | |
1165f5fe | 3845 | |
8b88b099 | 3846 | *val = 0; |
2f303b74 | 3847 | spin_lock(&kvm_lock); |
536a6f88 JF |
3848 | list_for_each_entry(kvm, &vm_list, vm_list) { |
3849 | stat_tmp.kvm = kvm; | |
3850 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3851 | *val += tmp_val; | |
3852 | } | |
2f303b74 | 3853 | spin_unlock(&kvm_lock); |
8b88b099 | 3854 | return 0; |
1165f5fe AK |
3855 | } |
3856 | ||
ce35ef27 SJS |
3857 | static int vcpu_stat_clear(void *_offset, u64 val) |
3858 | { | |
3859 | unsigned offset = (long)_offset; | |
3860 | struct kvm *kvm; | |
3861 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3862 | ||
3863 | if (val) | |
3864 | return -EINVAL; | |
3865 | ||
3866 | spin_lock(&kvm_lock); | |
3867 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3868 | stat_tmp.kvm = kvm; | |
3869 | vcpu_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3870 | } | |
3871 | spin_unlock(&kvm_lock); | |
3872 | ||
3873 | return 0; | |
3874 | } | |
3875 | ||
3876 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
3877 | "%llu\n"); | |
ba1389b7 | 3878 | |
828c0950 | 3879 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
3880 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
3881 | [KVM_STAT_VM] = &vm_stat_fops, | |
3882 | }; | |
1165f5fe | 3883 | |
286de8f6 CI |
3884 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
3885 | { | |
3886 | struct kobj_uevent_env *env; | |
286de8f6 CI |
3887 | unsigned long long created, active; |
3888 | ||
3889 | if (!kvm_dev.this_device || !kvm) | |
3890 | return; | |
3891 | ||
3892 | spin_lock(&kvm_lock); | |
3893 | if (type == KVM_EVENT_CREATE_VM) { | |
3894 | kvm_createvm_count++; | |
3895 | kvm_active_vms++; | |
3896 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
3897 | kvm_active_vms--; | |
3898 | } | |
3899 | created = kvm_createvm_count; | |
3900 | active = kvm_active_vms; | |
3901 | spin_unlock(&kvm_lock); | |
3902 | ||
3903 | env = kzalloc(sizeof(*env), GFP_KERNEL); | |
3904 | if (!env) | |
3905 | return; | |
3906 | ||
3907 | add_uevent_var(env, "CREATED=%llu", created); | |
3908 | add_uevent_var(env, "COUNT=%llu", active); | |
3909 | ||
fdeaf7e3 | 3910 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 3911 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
3912 | kvm->userspace_pid = task_pid_nr(current); |
3913 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 3914 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
3915 | } |
3916 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 CI |
3917 | |
3918 | if (kvm->debugfs_dentry) { | |
fdeaf7e3 CI |
3919 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL); |
3920 | ||
3921 | if (p) { | |
3922 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
3923 | if (!IS_ERR(tmp)) | |
3924 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
3925 | kfree(p); | |
286de8f6 CI |
3926 | } |
3927 | } | |
3928 | /* no need for checks, since we are adding at most only 5 keys */ | |
3929 | env->envp[env->envp_idx++] = NULL; | |
3930 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
3931 | kfree(env); | |
286de8f6 CI |
3932 | } |
3933 | ||
929f45e3 | 3934 | static void kvm_init_debug(void) |
6aa8b732 AK |
3935 | { |
3936 | struct kvm_stats_debugfs_item *p; | |
3937 | ||
76f7c879 | 3938 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 3939 | |
536a6f88 JF |
3940 | kvm_debugfs_num_entries = 0; |
3941 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
929f45e3 GKH |
3942 | debugfs_create_file(p->name, 0644, kvm_debugfs_dir, |
3943 | (void *)(long)p->offset, | |
3944 | stat_fops[p->kind]); | |
4f69b680 | 3945 | } |
6aa8b732 AK |
3946 | } |
3947 | ||
fb3600cc | 3948 | static int kvm_suspend(void) |
59ae6c6b | 3949 | { |
10474ae8 | 3950 | if (kvm_usage_count) |
75b7127c | 3951 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
3952 | return 0; |
3953 | } | |
3954 | ||
fb3600cc | 3955 | static void kvm_resume(void) |
59ae6c6b | 3956 | { |
ca84d1a2 | 3957 | if (kvm_usage_count) { |
4a937f96 | 3958 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
75b7127c | 3959 | hardware_enable_nolock(NULL); |
ca84d1a2 | 3960 | } |
59ae6c6b AK |
3961 | } |
3962 | ||
fb3600cc | 3963 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
3964 | .suspend = kvm_suspend, |
3965 | .resume = kvm_resume, | |
3966 | }; | |
3967 | ||
15ad7146 AK |
3968 | static inline |
3969 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
3970 | { | |
3971 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
3972 | } | |
3973 | ||
3974 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
3975 | { | |
3976 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 3977 | |
3a08a8f9 R |
3978 | if (vcpu->preempted) |
3979 | vcpu->preempted = false; | |
15ad7146 | 3980 | |
e790d9ef RK |
3981 | kvm_arch_sched_in(vcpu, cpu); |
3982 | ||
e9b11c17 | 3983 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
3984 | } |
3985 | ||
3986 | static void kvm_sched_out(struct preempt_notifier *pn, | |
3987 | struct task_struct *next) | |
3988 | { | |
3989 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3990 | ||
3a08a8f9 R |
3991 | if (current->state == TASK_RUNNING) |
3992 | vcpu->preempted = true; | |
e9b11c17 | 3993 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
3994 | } |
3995 | ||
0ee75bea | 3996 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 3997 | struct module *module) |
6aa8b732 AK |
3998 | { |
3999 | int r; | |
002c7f7c | 4000 | int cpu; |
6aa8b732 | 4001 | |
f8c16bba ZX |
4002 | r = kvm_arch_init(opaque); |
4003 | if (r) | |
d2308784 | 4004 | goto out_fail; |
cb498ea2 | 4005 | |
7dac16c3 AH |
4006 | /* |
4007 | * kvm_arch_init makes sure there's at most one caller | |
4008 | * for architectures that support multiple implementations, | |
4009 | * like intel and amd on x86. | |
36343f6e PB |
4010 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
4011 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 4012 | */ |
36343f6e PB |
4013 | r = kvm_irqfd_init(); |
4014 | if (r) | |
4015 | goto out_irqfd; | |
7dac16c3 | 4016 | |
8437a617 | 4017 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
4018 | r = -ENOMEM; |
4019 | goto out_free_0; | |
4020 | } | |
4021 | ||
e9b11c17 | 4022 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 4023 | if (r < 0) |
7f59f492 | 4024 | goto out_free_0a; |
6aa8b732 | 4025 | |
002c7f7c YS |
4026 | for_each_online_cpu(cpu) { |
4027 | smp_call_function_single(cpu, | |
e9b11c17 | 4028 | kvm_arch_check_processor_compat, |
8691e5a8 | 4029 | &r, 1); |
002c7f7c | 4030 | if (r < 0) |
d2308784 | 4031 | goto out_free_1; |
002c7f7c YS |
4032 | } |
4033 | ||
73c1b41e | 4034 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 4035 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 4036 | if (r) |
d2308784 | 4037 | goto out_free_2; |
6aa8b732 AK |
4038 | register_reboot_notifier(&kvm_reboot_notifier); |
4039 | ||
c16f862d | 4040 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
4041 | if (!vcpu_align) |
4042 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
4043 | kvm_vcpu_cache = |
4044 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
4045 | SLAB_ACCOUNT, | |
4046 | offsetof(struct kvm_vcpu, arch), | |
4047 | sizeof_field(struct kvm_vcpu, arch), | |
4048 | NULL); | |
c16f862d RR |
4049 | if (!kvm_vcpu_cache) { |
4050 | r = -ENOMEM; | |
fb3600cc | 4051 | goto out_free_3; |
c16f862d RR |
4052 | } |
4053 | ||
af585b92 GN |
4054 | r = kvm_async_pf_init(); |
4055 | if (r) | |
4056 | goto out_free; | |
4057 | ||
6aa8b732 | 4058 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
4059 | kvm_vm_fops.owner = module; |
4060 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
4061 | |
4062 | r = misc_register(&kvm_dev); | |
4063 | if (r) { | |
1170adc6 | 4064 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 4065 | goto out_unreg; |
6aa8b732 AK |
4066 | } |
4067 | ||
fb3600cc RW |
4068 | register_syscore_ops(&kvm_syscore_ops); |
4069 | ||
15ad7146 AK |
4070 | kvm_preempt_ops.sched_in = kvm_sched_in; |
4071 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4072 | ||
929f45e3 | 4073 | kvm_init_debug(); |
0ea4ed8e | 4074 | |
3c3c29fd PB |
4075 | r = kvm_vfio_ops_init(); |
4076 | WARN_ON(r); | |
4077 | ||
c7addb90 | 4078 | return 0; |
6aa8b732 | 4079 | |
af585b92 GN |
4080 | out_unreg: |
4081 | kvm_async_pf_deinit(); | |
6aa8b732 | 4082 | out_free: |
c16f862d | 4083 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 4084 | out_free_3: |
6aa8b732 | 4085 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4086 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 4087 | out_free_2: |
d2308784 | 4088 | out_free_1: |
e9b11c17 | 4089 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
4090 | out_free_0a: |
4091 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 4092 | out_free_0: |
a0f155e9 | 4093 | kvm_irqfd_exit(); |
36343f6e | 4094 | out_irqfd: |
7dac16c3 AH |
4095 | kvm_arch_exit(); |
4096 | out_fail: | |
6aa8b732 AK |
4097 | return r; |
4098 | } | |
cb498ea2 | 4099 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 4100 | |
cb498ea2 | 4101 | void kvm_exit(void) |
6aa8b732 | 4102 | { |
4bd33b56 | 4103 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 4104 | misc_deregister(&kvm_dev); |
c16f862d | 4105 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 4106 | kvm_async_pf_deinit(); |
fb3600cc | 4107 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 4108 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4109 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 4110 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 4111 | kvm_arch_hardware_unsetup(); |
f8c16bba | 4112 | kvm_arch_exit(); |
a0f155e9 | 4113 | kvm_irqfd_exit(); |
7f59f492 | 4114 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 4115 | kvm_vfio_ops_exit(); |
6aa8b732 | 4116 | } |
cb498ea2 | 4117 | EXPORT_SYMBOL_GPL(kvm_exit); |