Commit | Line | Data |
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20c8ccb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6aa8b732 AK |
2 | /* |
3 | * Kernel-based Virtual Machine driver for Linux | |
4 | * | |
5 | * This module enables machines with Intel VT-x extensions to run virtual | |
6 | * machines without emulation or binary translation. | |
7 | * | |
8 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 9 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
10 | * |
11 | * Authors: | |
12 | * Avi Kivity <avi@qumranet.com> | |
13 | * Yaniv Kamay <yaniv@qumranet.com> | |
6aa8b732 AK |
14 | */ |
15 | ||
af669ac6 | 16 | #include <kvm/iodev.h> |
6aa8b732 | 17 | |
edf88417 | 18 | #include <linux/kvm_host.h> |
6aa8b732 AK |
19 | #include <linux/kvm.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/errno.h> | |
6aa8b732 | 22 | #include <linux/percpu.h> |
6aa8b732 AK |
23 | #include <linux/mm.h> |
24 | #include <linux/miscdevice.h> | |
25 | #include <linux/vmalloc.h> | |
6aa8b732 | 26 | #include <linux/reboot.h> |
6aa8b732 AK |
27 | #include <linux/debugfs.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/file.h> | |
fb3600cc | 30 | #include <linux/syscore_ops.h> |
774c47f1 | 31 | #include <linux/cpu.h> |
174cd4b1 | 32 | #include <linux/sched/signal.h> |
6e84f315 | 33 | #include <linux/sched/mm.h> |
03441a34 | 34 | #include <linux/sched/stat.h> |
d9e368d6 AK |
35 | #include <linux/cpumask.h> |
36 | #include <linux/smp.h> | |
d6d28168 | 37 | #include <linux/anon_inodes.h> |
04d2cc77 | 38 | #include <linux/profile.h> |
7aa81cc0 | 39 | #include <linux/kvm_para.h> |
6fc138d2 | 40 | #include <linux/pagemap.h> |
8d4e1288 | 41 | #include <linux/mman.h> |
35149e21 | 42 | #include <linux/swap.h> |
e56d532f | 43 | #include <linux/bitops.h> |
547de29e | 44 | #include <linux/spinlock.h> |
6ff5894c | 45 | #include <linux/compat.h> |
bc6678a3 | 46 | #include <linux/srcu.h> |
8f0b1ab6 | 47 | #include <linux/hugetlb.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
743eeb0b SL |
49 | #include <linux/sort.h> |
50 | #include <linux/bsearch.h> | |
c011d23b | 51 | #include <linux/io.h> |
2eb06c30 | 52 | #include <linux/lockdep.h> |
6aa8b732 | 53 | |
e495606d | 54 | #include <asm/processor.h> |
2ea75be3 | 55 | #include <asm/ioctl.h> |
7c0f6ba6 | 56 | #include <linux/uaccess.h> |
3e021bf5 | 57 | #include <asm/pgtable.h> |
6aa8b732 | 58 | |
5f94c174 | 59 | #include "coalesced_mmio.h" |
af585b92 | 60 | #include "async_pf.h" |
3c3c29fd | 61 | #include "vfio.h" |
5f94c174 | 62 | |
229456fc MT |
63 | #define CREATE_TRACE_POINTS |
64 | #include <trace/events/kvm.h> | |
65 | ||
536a6f88 JF |
66 | /* Worst case buffer size needed for holding an integer. */ |
67 | #define ITOA_MAX_LEN 12 | |
68 | ||
6aa8b732 AK |
69 | MODULE_AUTHOR("Qumranet"); |
70 | MODULE_LICENSE("GPL"); | |
71 | ||
920552b2 | 72 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 73 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 74 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 75 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 76 | |
aca6ff29 | 77 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 78 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 79 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 80 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 | 81 | |
49113d36 NW |
82 | /* The start value to grow halt_poll_ns from */ |
83 | unsigned int halt_poll_ns_grow_start = 10000; /* 10us */ | |
84 | module_param(halt_poll_ns_grow_start, uint, 0644); | |
85 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start); | |
86 | ||
aca6ff29 | 87 | /* Default resets per-vcpu halt_poll_ns . */ |
ec76d819 | 88 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 89 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 90 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 91 | |
fa40a821 MT |
92 | /* |
93 | * Ordering of locks: | |
94 | * | |
b7d409de | 95 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
96 | */ |
97 | ||
0d9ce162 | 98 | DEFINE_MUTEX(kvm_lock); |
4a937f96 | 99 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 100 | LIST_HEAD(vm_list); |
133de902 | 101 | |
7f59f492 | 102 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 103 | static int kvm_usage_count; |
10474ae8 | 104 | static atomic_t hardware_enable_failed; |
1b6c0168 | 105 | |
c16f862d RR |
106 | struct kmem_cache *kvm_vcpu_cache; |
107 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 108 | |
15ad7146 AK |
109 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
110 | ||
76f7c879 | 111 | struct dentry *kvm_debugfs_dir; |
e23a808b | 112 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 113 | |
536a6f88 JF |
114 | static int kvm_debugfs_num_entries; |
115 | static const struct file_operations *stat_fops_per_vm[]; | |
116 | ||
bccf2150 AK |
117 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
118 | unsigned long arg); | |
de8e5d74 | 119 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
120 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
121 | unsigned long arg); | |
7ddfd3e0 MZ |
122 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
123 | #else | |
124 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, | |
125 | unsigned long arg) { return -EINVAL; } | |
126 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl | |
1dda606c | 127 | #endif |
10474ae8 AG |
128 | static int hardware_enable_all(void); |
129 | static void hardware_disable_all(void); | |
bccf2150 | 130 | |
e93f8a0f | 131 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 132 | |
bc009e43 | 133 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 134 | |
52480137 | 135 | __visible bool kvm_rebooting; |
b7c4145b | 136 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 137 | |
54dee993 MT |
138 | static bool largepages_enabled = true; |
139 | ||
286de8f6 CI |
140 | #define KVM_EVENT_CREATE_VM 0 |
141 | #define KVM_EVENT_DESTROY_VM 1 | |
142 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
143 | static unsigned long long kvm_createvm_count; | |
144 | static unsigned long long kvm_active_vms; | |
145 | ||
93065ac7 MH |
146 | __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
147 | unsigned long start, unsigned long end, bool blockable) | |
b1394e74 | 148 | { |
93065ac7 | 149 | return 0; |
b1394e74 RK |
150 | } |
151 | ||
ba049e93 | 152 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
cbff90a7 | 153 | { |
11feeb49 | 154 | if (pfn_valid(pfn)) |
bf4bea8e | 155 | return PageReserved(pfn_to_page(pfn)); |
cbff90a7 BAY |
156 | |
157 | return true; | |
158 | } | |
159 | ||
bccf2150 AK |
160 | /* |
161 | * Switches to specified vcpu, until a matching vcpu_put() | |
162 | */ | |
ec7660cc | 163 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 164 | { |
ec7660cc | 165 | int cpu = get_cpu(); |
15ad7146 | 166 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 167 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 168 | put_cpu(); |
6aa8b732 | 169 | } |
2f1fe811 | 170 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 171 | |
313a3dc7 | 172 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 173 | { |
15ad7146 | 174 | preempt_disable(); |
313a3dc7 | 175 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
176 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
177 | preempt_enable(); | |
6aa8b732 | 178 | } |
2f1fe811 | 179 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 180 | |
7a97cec2 PB |
181 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
182 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
183 | { | |
184 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
185 | ||
186 | /* | |
187 | * We need to wait for the VCPU to reenable interrupts and get out of | |
188 | * READING_SHADOW_PAGE_TABLES mode. | |
189 | */ | |
190 | if (req & KVM_REQUEST_WAIT) | |
191 | return mode != OUTSIDE_GUEST_MODE; | |
192 | ||
193 | /* | |
194 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
195 | */ | |
196 | return mode == IN_GUEST_MODE; | |
197 | } | |
198 | ||
d9e368d6 AK |
199 | static void ack_flush(void *_completed) |
200 | { | |
d9e368d6 AK |
201 | } |
202 | ||
b49defe8 PB |
203 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) |
204 | { | |
205 | if (unlikely(!cpus)) | |
206 | cpus = cpu_online_mask; | |
207 | ||
208 | if (cpumask_empty(cpus)) | |
209 | return false; | |
210 | ||
211 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
212 | return true; | |
213 | } | |
214 | ||
7053df4e VK |
215 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
216 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) | |
d9e368d6 | 217 | { |
597a5f55 | 218 | int i, cpu, me; |
d9e368d6 | 219 | struct kvm_vcpu *vcpu; |
7053df4e | 220 | bool called; |
6ef7a1bc | 221 | |
3cba4130 | 222 | me = get_cpu(); |
7053df4e | 223 | |
988a2cae | 224 | kvm_for_each_vcpu(i, vcpu, kvm) { |
a812297c | 225 | if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) |
7053df4e VK |
226 | continue; |
227 | ||
3cba4130 | 228 | kvm_make_request(req, vcpu); |
d9e368d6 | 229 | cpu = vcpu->cpu; |
6b7e2d09 | 230 | |
178f02ff RK |
231 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) |
232 | continue; | |
6c6e8360 | 233 | |
7053df4e | 234 | if (tmp != NULL && cpu != -1 && cpu != me && |
7a97cec2 | 235 | kvm_request_needs_ipi(vcpu, req)) |
7053df4e | 236 | __cpumask_set_cpu(cpu, tmp); |
49846896 | 237 | } |
7053df4e VK |
238 | |
239 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 240 | put_cpu(); |
7053df4e VK |
241 | |
242 | return called; | |
243 | } | |
244 | ||
245 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
246 | { | |
247 | cpumask_var_t cpus; | |
248 | bool called; | |
7053df4e VK |
249 | |
250 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
251 | ||
a812297c | 252 | called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus); |
7053df4e | 253 | |
6ef7a1bc | 254 | free_cpumask_var(cpus); |
49846896 | 255 | return called; |
d9e368d6 AK |
256 | } |
257 | ||
a6d51016 | 258 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 259 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 260 | { |
4ae3cb3a LT |
261 | /* |
262 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
263 | * kvm_make_all_cpus_request. | |
264 | */ | |
265 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
266 | ||
267 | /* | |
268 | * We want to publish modifications to the page tables before reading | |
269 | * mode. Pairs with a memory barrier in arch-specific code. | |
270 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
271 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
272 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
273 | * | |
274 | * There is already an smp_mb__after_atomic() before | |
275 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
276 | * barrier here. | |
277 | */ | |
b08660e5 TL |
278 | if (!kvm_arch_flush_remote_tlb(kvm) |
279 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
49846896 | 280 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 281 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 282 | } |
2ba9f0d8 | 283 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 284 | #endif |
2e53d63a | 285 | |
49846896 RR |
286 | void kvm_reload_remote_mmus(struct kvm *kvm) |
287 | { | |
445b8236 | 288 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 289 | } |
2e53d63a | 290 | |
fb3f0f51 RR |
291 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
292 | { | |
293 | struct page *page; | |
294 | int r; | |
295 | ||
296 | mutex_init(&vcpu->mutex); | |
297 | vcpu->cpu = -1; | |
fb3f0f51 RR |
298 | vcpu->kvm = kvm; |
299 | vcpu->vcpu_id = id; | |
34bb10b7 | 300 | vcpu->pid = NULL; |
8577370f | 301 | init_swait_queue_head(&vcpu->wq); |
af585b92 | 302 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 303 | |
bf9f6ac8 FW |
304 | vcpu->pre_pcpu = -1; |
305 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
306 | ||
fb3f0f51 RR |
307 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
308 | if (!page) { | |
309 | r = -ENOMEM; | |
310 | goto fail; | |
311 | } | |
312 | vcpu->run = page_address(page); | |
313 | ||
4c088493 R |
314 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
315 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 316 | vcpu->preempted = false; |
d73eb57b | 317 | vcpu->ready = false; |
4c088493 | 318 | |
e9b11c17 | 319 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 320 | if (r < 0) |
e9b11c17 | 321 | goto fail_free_run; |
fb3f0f51 RR |
322 | return 0; |
323 | ||
fb3f0f51 RR |
324 | fail_free_run: |
325 | free_page((unsigned long)vcpu->run); | |
326 | fail: | |
76fafa5e | 327 | return r; |
fb3f0f51 RR |
328 | } |
329 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
330 | ||
331 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
332 | { | |
0e4524a5 CB |
333 | /* |
334 | * no need for rcu_read_lock as VCPU_RUN is the only place that | |
335 | * will change the vcpu->pid pointer and on uninit all file | |
336 | * descriptors are already gone. | |
337 | */ | |
338 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
e9b11c17 | 339 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
340 | free_page((unsigned long)vcpu->run); |
341 | } | |
342 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
343 | ||
e930bffe AA |
344 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
345 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
346 | { | |
347 | return container_of(mn, struct kvm, mmu_notifier); | |
348 | } | |
349 | ||
3da0dd43 IE |
350 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
351 | struct mm_struct *mm, | |
352 | unsigned long address, | |
353 | pte_t pte) | |
354 | { | |
355 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 356 | int idx; |
3da0dd43 | 357 | |
bc6678a3 | 358 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
359 | spin_lock(&kvm->mmu_lock); |
360 | kvm->mmu_notifier_seq++; | |
0cf853c5 LT |
361 | |
362 | if (kvm_set_spte_hva(kvm, address, pte)) | |
363 | kvm_flush_remote_tlbs(kvm); | |
364 | ||
3da0dd43 | 365 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 366 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
367 | } |
368 | ||
93065ac7 | 369 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
5d6527a7 | 370 | const struct mmu_notifier_range *range) |
e930bffe AA |
371 | { |
372 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 373 | int need_tlb_flush = 0, idx; |
93065ac7 | 374 | int ret; |
e930bffe | 375 | |
bc6678a3 | 376 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
377 | spin_lock(&kvm->mmu_lock); |
378 | /* | |
379 | * The count increase must become visible at unlock time as no | |
380 | * spte can be established without taking the mmu_lock and | |
381 | * count is also read inside the mmu_lock critical section. | |
382 | */ | |
383 | kvm->mmu_notifier_count++; | |
5d6527a7 | 384 | need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end); |
a4ee1ca4 | 385 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
386 | /* we've to flush the tlb before the pages can be freed */ |
387 | if (need_tlb_flush) | |
388 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
389 | |
390 | spin_unlock(&kvm->mmu_lock); | |
b1394e74 | 391 | |
5d6527a7 | 392 | ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start, |
dfcd6660 JG |
393 | range->end, |
394 | mmu_notifier_range_blockable(range)); | |
b1394e74 | 395 | |
565f3be2 | 396 | srcu_read_unlock(&kvm->srcu, idx); |
93065ac7 MH |
397 | |
398 | return ret; | |
e930bffe AA |
399 | } |
400 | ||
401 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
5d6527a7 | 402 | const struct mmu_notifier_range *range) |
e930bffe AA |
403 | { |
404 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
405 | ||
406 | spin_lock(&kvm->mmu_lock); | |
407 | /* | |
408 | * This sequence increase will notify the kvm page fault that | |
409 | * the page that is going to be mapped in the spte could have | |
410 | * been freed. | |
411 | */ | |
412 | kvm->mmu_notifier_seq++; | |
a355aa54 | 413 | smp_wmb(); |
e930bffe AA |
414 | /* |
415 | * The above sequence increase must be visible before the | |
a355aa54 PM |
416 | * below count decrease, which is ensured by the smp_wmb above |
417 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
418 | */ |
419 | kvm->mmu_notifier_count--; | |
420 | spin_unlock(&kvm->mmu_lock); | |
421 | ||
422 | BUG_ON(kvm->mmu_notifier_count < 0); | |
423 | } | |
424 | ||
425 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
426 | struct mm_struct *mm, | |
57128468 ALC |
427 | unsigned long start, |
428 | unsigned long end) | |
e930bffe AA |
429 | { |
430 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 431 | int young, idx; |
e930bffe | 432 | |
bc6678a3 | 433 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 434 | spin_lock(&kvm->mmu_lock); |
e930bffe | 435 | |
57128468 | 436 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
437 | if (young) |
438 | kvm_flush_remote_tlbs(kvm); | |
439 | ||
565f3be2 TY |
440 | spin_unlock(&kvm->mmu_lock); |
441 | srcu_read_unlock(&kvm->srcu, idx); | |
442 | ||
e930bffe AA |
443 | return young; |
444 | } | |
445 | ||
1d7715c6 VD |
446 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
447 | struct mm_struct *mm, | |
448 | unsigned long start, | |
449 | unsigned long end) | |
450 | { | |
451 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
452 | int young, idx; | |
453 | ||
454 | idx = srcu_read_lock(&kvm->srcu); | |
455 | spin_lock(&kvm->mmu_lock); | |
456 | /* | |
457 | * Even though we do not flush TLB, this will still adversely | |
458 | * affect performance on pre-Haswell Intel EPT, where there is | |
459 | * no EPT Access Bit to clear so that we have to tear down EPT | |
460 | * tables instead. If we find this unacceptable, we can always | |
461 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
462 | * do anything on clear_young. | |
463 | * | |
464 | * Also note that currently we never issue secondary TLB flushes | |
465 | * from clear_young, leaving this job up to the regular system | |
466 | * cadence. If we find this inaccurate, we might come up with a | |
467 | * more sophisticated heuristic later. | |
468 | */ | |
469 | young = kvm_age_hva(kvm, start, end); | |
470 | spin_unlock(&kvm->mmu_lock); | |
471 | srcu_read_unlock(&kvm->srcu, idx); | |
472 | ||
473 | return young; | |
474 | } | |
475 | ||
8ee53820 AA |
476 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
477 | struct mm_struct *mm, | |
478 | unsigned long address) | |
479 | { | |
480 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
481 | int young, idx; | |
482 | ||
483 | idx = srcu_read_lock(&kvm->srcu); | |
484 | spin_lock(&kvm->mmu_lock); | |
485 | young = kvm_test_age_hva(kvm, address); | |
486 | spin_unlock(&kvm->mmu_lock); | |
487 | srcu_read_unlock(&kvm->srcu, idx); | |
488 | ||
489 | return young; | |
490 | } | |
491 | ||
85db06e5 MT |
492 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
493 | struct mm_struct *mm) | |
494 | { | |
495 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
496 | int idx; |
497 | ||
498 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 499 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 500 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
501 | } |
502 | ||
e930bffe | 503 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e930bffe AA |
504 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
505 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
506 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 507 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 508 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 509 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 510 | .release = kvm_mmu_notifier_release, |
e930bffe | 511 | }; |
4c07b0a4 AK |
512 | |
513 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
514 | { | |
515 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
516 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
517 | } | |
518 | ||
519 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
520 | ||
521 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
522 | { | |
523 | return 0; | |
524 | } | |
525 | ||
e930bffe AA |
526 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
527 | ||
a47d2b07 | 528 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
529 | { |
530 | int i; | |
a47d2b07 | 531 | struct kvm_memslots *slots; |
bf3e05bc | 532 | |
b12ce36a | 533 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
a47d2b07 PB |
534 | if (!slots) |
535 | return NULL; | |
536 | ||
bf3e05bc | 537 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
f85e2cb5 | 538 | slots->id_to_index[i] = slots->memslots[i].id = i; |
a47d2b07 PB |
539 | |
540 | return slots; | |
541 | } | |
542 | ||
543 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
544 | { | |
545 | if (!memslot->dirty_bitmap) | |
546 | return; | |
547 | ||
548 | kvfree(memslot->dirty_bitmap); | |
549 | memslot->dirty_bitmap = NULL; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Free any memory in @free but not in @dont. | |
554 | */ | |
555 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
556 | struct kvm_memory_slot *dont) | |
557 | { | |
558 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
559 | kvm_destroy_dirty_bitmap(free); | |
560 | ||
561 | kvm_arch_free_memslot(kvm, free, dont); | |
562 | ||
563 | free->npages = 0; | |
564 | } | |
565 | ||
566 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
567 | { | |
568 | struct kvm_memory_slot *memslot; | |
569 | ||
570 | if (!slots) | |
571 | return; | |
572 | ||
573 | kvm_for_each_memslot(memslot, slots) | |
574 | kvm_free_memslot(kvm, memslot, NULL); | |
575 | ||
576 | kvfree(slots); | |
bf3e05bc XG |
577 | } |
578 | ||
536a6f88 JF |
579 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
580 | { | |
581 | int i; | |
582 | ||
583 | if (!kvm->debugfs_dentry) | |
584 | return; | |
585 | ||
586 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
587 | ||
9d5a1dce LC |
588 | if (kvm->debugfs_stat_data) { |
589 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
590 | kfree(kvm->debugfs_stat_data[i]); | |
591 | kfree(kvm->debugfs_stat_data); | |
592 | } | |
536a6f88 JF |
593 | } |
594 | ||
595 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
596 | { | |
597 | char dir_name[ITOA_MAX_LEN * 2]; | |
598 | struct kvm_stat_data *stat_data; | |
599 | struct kvm_stats_debugfs_item *p; | |
600 | ||
601 | if (!debugfs_initialized()) | |
602 | return 0; | |
603 | ||
604 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
929f45e3 | 605 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir); |
536a6f88 JF |
606 | |
607 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
608 | sizeof(*kvm->debugfs_stat_data), | |
b12ce36a | 609 | GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
610 | if (!kvm->debugfs_stat_data) |
611 | return -ENOMEM; | |
612 | ||
613 | for (p = debugfs_entries; p->name; p++) { | |
b12ce36a | 614 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
615 | if (!stat_data) |
616 | return -ENOMEM; | |
617 | ||
618 | stat_data->kvm = kvm; | |
619 | stat_data->offset = p->offset; | |
833b45de | 620 | stat_data->mode = p->mode ? p->mode : 0644; |
536a6f88 | 621 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; |
833b45de | 622 | debugfs_create_file(p->name, stat_data->mode, kvm->debugfs_dentry, |
929f45e3 | 623 | stat_data, stat_fops_per_vm[p->kind]); |
536a6f88 JF |
624 | } |
625 | return 0; | |
626 | } | |
627 | ||
e08b9637 | 628 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 629 | { |
d89f5eff JK |
630 | int r, i; |
631 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 632 | |
d89f5eff JK |
633 | if (!kvm) |
634 | return ERR_PTR(-ENOMEM); | |
635 | ||
e9ad4ec8 | 636 | spin_lock_init(&kvm->mmu_lock); |
f1f10076 | 637 | mmgrab(current->mm); |
e9ad4ec8 PB |
638 | kvm->mm = current->mm; |
639 | kvm_eventfd_init(kvm); | |
640 | mutex_init(&kvm->lock); | |
641 | mutex_init(&kvm->irq_lock); | |
642 | mutex_init(&kvm->slots_lock); | |
e3736c3e | 643 | refcount_set(&kvm->users_count, 1); |
e9ad4ec8 PB |
644 | INIT_LIST_HEAD(&kvm->devices); |
645 | ||
e08b9637 | 646 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 647 | if (r) |
719d93cd | 648 | goto out_err_no_disable; |
10474ae8 AG |
649 | |
650 | r = hardware_enable_all(); | |
651 | if (r) | |
719d93cd | 652 | goto out_err_no_disable; |
10474ae8 | 653 | |
c77dcacb | 654 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 655 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 656 | #endif |
6aa8b732 | 657 | |
1e702d9a AW |
658 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
659 | ||
46a26bf5 | 660 | r = -ENOMEM; |
f481b069 | 661 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 PB |
662 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
663 | if (!slots) | |
f481b069 | 664 | goto out_err_no_srcu; |
0e32958e | 665 | /* Generations must be different for each address space. */ |
164bf7e5 | 666 | slots->generation = i; |
4bd518f1 | 667 | rcu_assign_pointer(kvm->memslots[i], slots); |
f481b069 | 668 | } |
00f034a1 | 669 | |
bc6678a3 | 670 | if (init_srcu_struct(&kvm->srcu)) |
719d93cd CB |
671 | goto out_err_no_srcu; |
672 | if (init_srcu_struct(&kvm->irq_srcu)) | |
673 | goto out_err_no_irq_srcu; | |
e93f8a0f | 674 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 | 675 | rcu_assign_pointer(kvm->buses[i], |
b12ce36a | 676 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT)); |
57e7fbee | 677 | if (!kvm->buses[i]) |
e93f8a0f | 678 | goto out_err; |
e93f8a0f | 679 | } |
e930bffe | 680 | |
74b5c5bf MW |
681 | r = kvm_init_mmu_notifier(kvm); |
682 | if (r) | |
683 | goto out_err; | |
684 | ||
0d9ce162 | 685 | mutex_lock(&kvm_lock); |
5e58cfe4 | 686 | list_add(&kvm->vm_list, &vm_list); |
0d9ce162 | 687 | mutex_unlock(&kvm_lock); |
d89f5eff | 688 | |
2ecd9d29 PZ |
689 | preempt_notifier_inc(); |
690 | ||
f17abe9a | 691 | return kvm; |
10474ae8 AG |
692 | |
693 | out_err: | |
719d93cd CB |
694 | cleanup_srcu_struct(&kvm->irq_srcu); |
695 | out_err_no_irq_srcu: | |
57e7fbee | 696 | cleanup_srcu_struct(&kvm->srcu); |
719d93cd | 697 | out_err_no_srcu: |
10474ae8 | 698 | hardware_disable_all(); |
719d93cd | 699 | out_err_no_disable: |
021086e3 | 700 | refcount_set(&kvm->users_count, 0); |
e93f8a0f | 701 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 702 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 703 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 704 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
d89f5eff | 705 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 706 | mmdrop(current->mm); |
10474ae8 | 707 | return ERR_PTR(r); |
f17abe9a AK |
708 | } |
709 | ||
07f0a7bd SW |
710 | static void kvm_destroy_devices(struct kvm *kvm) |
711 | { | |
e6e3b5a6 | 712 | struct kvm_device *dev, *tmp; |
07f0a7bd | 713 | |
a28ebea2 CD |
714 | /* |
715 | * We do not need to take the kvm->lock here, because nobody else | |
716 | * has a reference to the struct kvm at this point and therefore | |
717 | * cannot access the devices list anyhow. | |
718 | */ | |
e6e3b5a6 GT |
719 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
720 | list_del(&dev->vm_node); | |
07f0a7bd SW |
721 | dev->ops->destroy(dev); |
722 | } | |
723 | } | |
724 | ||
f17abe9a AK |
725 | static void kvm_destroy_vm(struct kvm *kvm) |
726 | { | |
e93f8a0f | 727 | int i; |
6d4e4c4f AK |
728 | struct mm_struct *mm = kvm->mm; |
729 | ||
286de8f6 | 730 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 731 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 732 | kvm_arch_sync_events(kvm); |
0d9ce162 | 733 | mutex_lock(&kvm_lock); |
133de902 | 734 | list_del(&kvm->vm_list); |
0d9ce162 | 735 | mutex_unlock(&kvm_lock); |
399ec807 | 736 | kvm_free_irq_routing(kvm); |
df630b8c | 737 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 738 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 739 | |
4a12f951 CB |
740 | if (bus) |
741 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
742 | kvm->buses[i] = NULL; |
743 | } | |
980da6ce | 744 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
745 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
746 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 747 | #else |
2df72e9b | 748 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 749 | #endif |
d19a9cd2 | 750 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 751 | kvm_destroy_devices(kvm); |
f481b069 | 752 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 753 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 754 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
755 | cleanup_srcu_struct(&kvm->srcu); |
756 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 757 | preempt_notifier_dec(); |
10474ae8 | 758 | hardware_disable_all(); |
6d4e4c4f | 759 | mmdrop(mm); |
f17abe9a AK |
760 | } |
761 | ||
d39f13b0 IE |
762 | void kvm_get_kvm(struct kvm *kvm) |
763 | { | |
e3736c3e | 764 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
765 | } |
766 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
767 | ||
768 | void kvm_put_kvm(struct kvm *kvm) | |
769 | { | |
e3736c3e | 770 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
771 | kvm_destroy_vm(kvm); |
772 | } | |
773 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
774 | ||
775 | ||
f17abe9a AK |
776 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
777 | { | |
778 | struct kvm *kvm = filp->private_data; | |
779 | ||
721eecbf GH |
780 | kvm_irqfd_release(kvm); |
781 | ||
d39f13b0 | 782 | kvm_put_kvm(kvm); |
6aa8b732 AK |
783 | return 0; |
784 | } | |
785 | ||
515a0127 TY |
786 | /* |
787 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 788 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 789 | */ |
a36a57b1 TY |
790 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
791 | { | |
515a0127 | 792 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 793 | |
b12ce36a | 794 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT); |
a36a57b1 TY |
795 | if (!memslot->dirty_bitmap) |
796 | return -ENOMEM; | |
797 | ||
a36a57b1 TY |
798 | return 0; |
799 | } | |
800 | ||
bf3e05bc | 801 | /* |
0e60b079 IM |
802 | * Insert memslot and re-sort memslots based on their GFN, |
803 | * so binary search could be used to lookup GFN. | |
804 | * Sorting algorithm takes advantage of having initially | |
805 | * sorted array and known changed memslot position. | |
bf3e05bc | 806 | */ |
5cc15027 | 807 | static void update_memslots(struct kvm_memslots *slots, |
31fc4f95 WY |
808 | struct kvm_memory_slot *new, |
809 | enum kvm_mr_change change) | |
bf3e05bc | 810 | { |
8593176c PB |
811 | int id = new->id; |
812 | int i = slots->id_to_index[id]; | |
063584d4 | 813 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 814 | |
8593176c | 815 | WARN_ON(mslots[i].id != id); |
31fc4f95 WY |
816 | switch (change) { |
817 | case KVM_MR_CREATE: | |
818 | slots->used_slots++; | |
819 | WARN_ON(mslots[i].npages || !new->npages); | |
820 | break; | |
821 | case KVM_MR_DELETE: | |
822 | slots->used_slots--; | |
823 | WARN_ON(new->npages || !mslots[i].npages); | |
824 | break; | |
825 | default: | |
826 | break; | |
9c1a5d38 | 827 | } |
0e60b079 | 828 | |
7f379cff | 829 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
830 | new->base_gfn <= mslots[i + 1].base_gfn) { |
831 | if (!mslots[i + 1].npages) | |
832 | break; | |
7f379cff IM |
833 | mslots[i] = mslots[i + 1]; |
834 | slots->id_to_index[mslots[i].id] = i; | |
835 | i++; | |
836 | } | |
efbeec70 PB |
837 | |
838 | /* | |
839 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
840 | * so that it moves before all those with base_gfn == npages == 0. | |
841 | * | |
842 | * On the other hand, if new->npages is zero, the above loop has | |
843 | * already left i pointing to the beginning of the empty part of | |
844 | * mslots, and the ">=" would move the hole backwards in this | |
845 | * case---which is wrong. So skip the loop when deleting a slot. | |
846 | */ | |
847 | if (new->npages) { | |
848 | while (i > 0 && | |
849 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
850 | mslots[i] = mslots[i - 1]; | |
851 | slots->id_to_index[mslots[i].id] = i; | |
852 | i--; | |
853 | } | |
dbaff309 PB |
854 | } else |
855 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 856 | |
8593176c PB |
857 | mslots[i] = *new; |
858 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
859 | } |
860 | ||
09170a49 | 861 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 862 | { |
4d8b81ab XG |
863 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
864 | ||
0f8a4de3 | 865 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
866 | valid_flags |= KVM_MEM_READONLY; |
867 | #endif | |
868 | ||
869 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
870 | return -EINVAL; |
871 | ||
872 | return 0; | |
873 | } | |
874 | ||
7ec4fb44 | 875 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 876 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 877 | { |
f481b069 | 878 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
361209e0 | 879 | u64 gen = old_memslots->generation; |
7ec4fb44 | 880 | |
361209e0 SC |
881 | WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS); |
882 | slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
ee3d1570 | 883 | |
f481b069 | 884 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 885 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 886 | |
ee3d1570 | 887 | /* |
361209e0 SC |
888 | * Increment the new memslot generation a second time, dropping the |
889 | * update in-progress flag and incrementing then generation based on | |
890 | * the number of address spaces. This provides a unique and easily | |
891 | * identifiable generation number while the memslots are in flux. | |
892 | */ | |
893 | gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
894 | ||
895 | /* | |
4bd518f1 PB |
896 | * Generations must be unique even across address spaces. We do not need |
897 | * a global counter for that, instead the generation space is evenly split | |
898 | * across address spaces. For example, with two address spaces, address | |
164bf7e5 SC |
899 | * space 0 will use generations 0, 2, 4, ... while address space 1 will |
900 | * use generations 1, 3, 5, ... | |
ee3d1570 | 901 | */ |
164bf7e5 | 902 | gen += KVM_ADDRESS_SPACE_NUM; |
ee3d1570 | 903 | |
15248258 | 904 | kvm_arch_memslots_updated(kvm, gen); |
ee3d1570 | 905 | |
15248258 | 906 | slots->generation = gen; |
e59dbe09 TY |
907 | |
908 | return old_memslots; | |
7ec4fb44 GN |
909 | } |
910 | ||
6aa8b732 AK |
911 | /* |
912 | * Allocate some memory and give it an address in the guest physical address | |
913 | * space. | |
914 | * | |
915 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 916 | * |
02d5d55b | 917 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 918 | */ |
f78e0e2e | 919 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 920 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 921 | { |
8234b22e | 922 | int r; |
6aa8b732 | 923 | gfn_t base_gfn; |
28bcb112 | 924 | unsigned long npages; |
a843fac2 | 925 | struct kvm_memory_slot *slot; |
6aa8b732 | 926 | struct kvm_memory_slot old, new; |
b7f69c55 | 927 | struct kvm_memslots *slots = NULL, *old_memslots; |
f481b069 | 928 | int as_id, id; |
f64c0398 | 929 | enum kvm_mr_change change; |
6aa8b732 | 930 | |
a50d64d6 XG |
931 | r = check_memory_region_flags(mem); |
932 | if (r) | |
933 | goto out; | |
934 | ||
6aa8b732 | 935 | r = -EINVAL; |
f481b069 PB |
936 | as_id = mem->slot >> 16; |
937 | id = (u16)mem->slot; | |
938 | ||
6aa8b732 AK |
939 | /* General sanity checks */ |
940 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
941 | goto out; | |
942 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
943 | goto out; | |
fa3d315a | 944 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 945 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 946 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
96d4f267 | 947 | !access_ok((void __user *)(unsigned long)mem->userspace_addr, |
9e3bb6b6 | 948 | mem->memory_size))) |
78749809 | 949 | goto out; |
f481b069 | 950 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
951 | goto out; |
952 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
953 | goto out; | |
954 | ||
f481b069 | 955 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
6aa8b732 AK |
956 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
957 | npages = mem->memory_size >> PAGE_SHIFT; | |
958 | ||
660c22c4 TY |
959 | if (npages > KVM_MEM_MAX_NR_PAGES) |
960 | goto out; | |
961 | ||
a843fac2 | 962 | new = old = *slot; |
6aa8b732 | 963 | |
f481b069 | 964 | new.id = id; |
6aa8b732 AK |
965 | new.base_gfn = base_gfn; |
966 | new.npages = npages; | |
967 | new.flags = mem->flags; | |
968 | ||
f64c0398 TY |
969 | if (npages) { |
970 | if (!old.npages) | |
971 | change = KVM_MR_CREATE; | |
972 | else { /* Modify an existing slot. */ | |
973 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
974 | (npages != old.npages) || |
975 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
976 | goto out; |
977 | ||
978 | if (base_gfn != old.base_gfn) | |
979 | change = KVM_MR_MOVE; | |
980 | else if (new.flags != old.flags) | |
981 | change = KVM_MR_FLAGS_ONLY; | |
982 | else { /* Nothing to change. */ | |
983 | r = 0; | |
984 | goto out; | |
985 | } | |
986 | } | |
09170a49 PB |
987 | } else { |
988 | if (!old.npages) | |
989 | goto out; | |
990 | ||
f64c0398 | 991 | change = KVM_MR_DELETE; |
09170a49 PB |
992 | new.base_gfn = 0; |
993 | new.flags = 0; | |
994 | } | |
6aa8b732 | 995 | |
f64c0398 | 996 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
997 | /* Check for overlaps */ |
998 | r = -EEXIST; | |
f481b069 | 999 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
b28676bb | 1000 | if (slot->id == id) |
0a706bee TY |
1001 | continue; |
1002 | if (!((base_gfn + npages <= slot->base_gfn) || | |
1003 | (base_gfn >= slot->base_gfn + slot->npages))) | |
1004 | goto out; | |
1005 | } | |
6aa8b732 | 1006 | } |
6aa8b732 | 1007 | |
6aa8b732 AK |
1008 | /* Free page dirty bitmap if unneeded */ |
1009 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 1010 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
1011 | |
1012 | r = -ENOMEM; | |
f64c0398 | 1013 | if (change == KVM_MR_CREATE) { |
189a2f7b | 1014 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 1015 | |
5587027c | 1016 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 1017 | goto out_free; |
6aa8b732 | 1018 | } |
ec04b260 | 1019 | |
6aa8b732 AK |
1020 | /* Allocate page dirty bitmap if needed */ |
1021 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 1022 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 1023 | goto out_free; |
6aa8b732 AK |
1024 | } |
1025 | ||
b12ce36a | 1026 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
f2a81036 PB |
1027 | if (!slots) |
1028 | goto out_free; | |
f481b069 | 1029 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
f2a81036 | 1030 | |
f64c0398 | 1031 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
f481b069 | 1032 | slot = id_to_memslot(slots, id); |
28a37544 XG |
1033 | slot->flags |= KVM_MEMSLOT_INVALID; |
1034 | ||
f481b069 | 1035 | old_memslots = install_new_memslots(kvm, as_id, slots); |
bc6678a3 | 1036 | |
12d6e753 MT |
1037 | /* From this point no new shadow pages pointing to a deleted, |
1038 | * or moved, memslot will be created. | |
bc6678a3 MT |
1039 | * |
1040 | * validation of sp->gfn happens in: | |
b7d409de XL |
1041 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
1042 | * - kvm_is_visible_gfn (mmu_check_roots) | |
bc6678a3 | 1043 | */ |
2df72e9b | 1044 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
1045 | |
1046 | /* | |
1047 | * We can re-use the old_memslots from above, the only difference | |
1048 | * from the currently installed memslots is the invalid flag. This | |
1049 | * will get overwritten by update_memslots anyway. | |
1050 | */ | |
b7f69c55 | 1051 | slots = old_memslots; |
bc6678a3 | 1052 | } |
34d4cb8f | 1053 | |
7b6195a9 | 1054 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 1055 | if (r) |
b7f69c55 | 1056 | goto out_slots; |
f7784b8e | 1057 | |
a47d2b07 | 1058 | /* actual memory is freed via old in kvm_free_memslot below */ |
f64c0398 | 1059 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 1060 | new.dirty_bitmap = NULL; |
db3fe4eb | 1061 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
1062 | } |
1063 | ||
31fc4f95 | 1064 | update_memslots(slots, &new, change); |
f481b069 | 1065 | old_memslots = install_new_memslots(kvm, as_id, slots); |
3ad82a7e | 1066 | |
f36f3f28 | 1067 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
82ce2c96 | 1068 | |
a47d2b07 | 1069 | kvm_free_memslot(kvm, &old, &new); |
74496134 | 1070 | kvfree(old_memslots); |
6aa8b732 AK |
1071 | return 0; |
1072 | ||
e40f193f | 1073 | out_slots: |
74496134 | 1074 | kvfree(slots); |
f78e0e2e | 1075 | out_free: |
a47d2b07 | 1076 | kvm_free_memslot(kvm, &new, &old); |
6aa8b732 AK |
1077 | out: |
1078 | return r; | |
210c7c4d | 1079 | } |
f78e0e2e SY |
1080 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1081 | ||
1082 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1083 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1084 | { |
1085 | int r; | |
1086 | ||
79fac95e | 1087 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1088 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1089 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1090 | return r; |
1091 | } | |
210c7c4d IE |
1092 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1093 | ||
7940876e SH |
1094 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1095 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1096 | { |
f481b069 | 1097 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1098 | return -EINVAL; |
09170a49 | 1099 | |
47ae31e2 | 1100 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1101 | } |
1102 | ||
5bb064dc ZX |
1103 | int kvm_get_dirty_log(struct kvm *kvm, |
1104 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 | 1105 | { |
9f6b8029 | 1106 | struct kvm_memslots *slots; |
6aa8b732 | 1107 | struct kvm_memory_slot *memslot; |
843574a3 | 1108 | int i, as_id, id; |
87bf6e7d | 1109 | unsigned long n; |
6aa8b732 AK |
1110 | unsigned long any = 0; |
1111 | ||
f481b069 PB |
1112 | as_id = log->slot >> 16; |
1113 | id = (u16)log->slot; | |
1114 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1115 | return -EINVAL; |
6aa8b732 | 1116 | |
f481b069 PB |
1117 | slots = __kvm_memslots(kvm, as_id); |
1118 | memslot = id_to_memslot(slots, id); | |
6aa8b732 | 1119 | if (!memslot->dirty_bitmap) |
843574a3 | 1120 | return -ENOENT; |
6aa8b732 | 1121 | |
87bf6e7d | 1122 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 1123 | |
cd1a4a98 | 1124 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
1125 | any = memslot->dirty_bitmap[i]; |
1126 | ||
6aa8b732 | 1127 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
843574a3 | 1128 | return -EFAULT; |
6aa8b732 | 1129 | |
5bb064dc ZX |
1130 | if (any) |
1131 | *is_dirty = 1; | |
843574a3 | 1132 | return 0; |
6aa8b732 | 1133 | } |
2ba9f0d8 | 1134 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1135 | |
ba0513b5 MS |
1136 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
1137 | /** | |
b8b00220 | 1138 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages |
2a31b9db | 1139 | * and reenable dirty page tracking for the corresponding pages. |
ba0513b5 MS |
1140 | * @kvm: pointer to kvm instance |
1141 | * @log: slot id and address to which we copy the log | |
b8b00220 | 1142 | * @flush: true if TLB flush is needed by caller |
ba0513b5 MS |
1143 | * |
1144 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1145 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1146 | * following order: | |
1147 | * | |
1148 | * 1. Take a snapshot of the bit and clear it if needed. | |
1149 | * 2. Write protect the corresponding page. | |
1150 | * 3. Copy the snapshot to the userspace. | |
1151 | * 4. Upon return caller flushes TLB's if needed. | |
1152 | * | |
1153 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1154 | * entry. This is not a problem because the page is reported dirty using | |
1155 | * the snapshot taken before and step 4 ensures that writes done after | |
1156 | * exiting to userspace will be logged for the next call. | |
1157 | * | |
1158 | */ | |
1159 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
8fe65a82 | 1160 | struct kvm_dirty_log *log, bool *flush) |
ba0513b5 | 1161 | { |
9f6b8029 | 1162 | struct kvm_memslots *slots; |
ba0513b5 | 1163 | struct kvm_memory_slot *memslot; |
58d6db34 | 1164 | int i, as_id, id; |
ba0513b5 MS |
1165 | unsigned long n; |
1166 | unsigned long *dirty_bitmap; | |
1167 | unsigned long *dirty_bitmap_buffer; | |
1168 | ||
f481b069 PB |
1169 | as_id = log->slot >> 16; |
1170 | id = (u16)log->slot; | |
1171 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1172 | return -EINVAL; |
ba0513b5 | 1173 | |
f481b069 PB |
1174 | slots = __kvm_memslots(kvm, as_id); |
1175 | memslot = id_to_memslot(slots, id); | |
ba0513b5 MS |
1176 | |
1177 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1178 | if (!dirty_bitmap) |
58d6db34 | 1179 | return -ENOENT; |
ba0513b5 MS |
1180 | |
1181 | n = kvm_dirty_bitmap_bytes(memslot); | |
2a31b9db PB |
1182 | *flush = false; |
1183 | if (kvm->manual_dirty_log_protect) { | |
1184 | /* | |
1185 | * Unlike kvm_get_dirty_log, we always return false in *flush, | |
1186 | * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There | |
1187 | * is some code duplication between this function and | |
1188 | * kvm_get_dirty_log, but hopefully all architecture | |
1189 | * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log | |
1190 | * can be eliminated. | |
1191 | */ | |
1192 | dirty_bitmap_buffer = dirty_bitmap; | |
1193 | } else { | |
1194 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); | |
1195 | memset(dirty_bitmap_buffer, 0, n); | |
ba0513b5 | 1196 | |
2a31b9db PB |
1197 | spin_lock(&kvm->mmu_lock); |
1198 | for (i = 0; i < n / sizeof(long); i++) { | |
1199 | unsigned long mask; | |
1200 | gfn_t offset; | |
ba0513b5 | 1201 | |
2a31b9db PB |
1202 | if (!dirty_bitmap[i]) |
1203 | continue; | |
1204 | ||
1205 | *flush = true; | |
1206 | mask = xchg(&dirty_bitmap[i], 0); | |
1207 | dirty_bitmap_buffer[i] = mask; | |
1208 | ||
a67794ca LT |
1209 | offset = i * BITS_PER_LONG; |
1210 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1211 | offset, mask); | |
2a31b9db PB |
1212 | } |
1213 | spin_unlock(&kvm->mmu_lock); | |
1214 | } | |
1215 | ||
1216 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1217 | return -EFAULT; | |
1218 | return 0; | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1221 | ||
1222 | /** | |
1223 | * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap | |
1224 | * and reenable dirty page tracking for the corresponding pages. | |
1225 | * @kvm: pointer to kvm instance | |
1226 | * @log: slot id and address from which to fetch the bitmap of dirty pages | |
b8b00220 | 1227 | * @flush: true if TLB flush is needed by caller |
2a31b9db PB |
1228 | */ |
1229 | int kvm_clear_dirty_log_protect(struct kvm *kvm, | |
1230 | struct kvm_clear_dirty_log *log, bool *flush) | |
1231 | { | |
1232 | struct kvm_memslots *slots; | |
1233 | struct kvm_memory_slot *memslot; | |
98938aa8 | 1234 | int as_id, id; |
2a31b9db | 1235 | gfn_t offset; |
98938aa8 | 1236 | unsigned long i, n; |
2a31b9db PB |
1237 | unsigned long *dirty_bitmap; |
1238 | unsigned long *dirty_bitmap_buffer; | |
1239 | ||
1240 | as_id = log->slot >> 16; | |
1241 | id = (u16)log->slot; | |
1242 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1243 | return -EINVAL; | |
1244 | ||
76d58e0f | 1245 | if (log->first_page & 63) |
2a31b9db PB |
1246 | return -EINVAL; |
1247 | ||
1248 | slots = __kvm_memslots(kvm, as_id); | |
1249 | memslot = id_to_memslot(slots, id); | |
1250 | ||
1251 | dirty_bitmap = memslot->dirty_bitmap; | |
1252 | if (!dirty_bitmap) | |
1253 | return -ENOENT; | |
1254 | ||
4ddc9204 | 1255 | n = ALIGN(log->num_pages, BITS_PER_LONG) / 8; |
98938aa8 TB |
1256 | |
1257 | if (log->first_page > memslot->npages || | |
76d58e0f PB |
1258 | log->num_pages > memslot->npages - log->first_page || |
1259 | (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63))) | |
1260 | return -EINVAL; | |
98938aa8 | 1261 | |
8fe65a82 | 1262 | *flush = false; |
2a31b9db PB |
1263 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
1264 | if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n)) | |
1265 | return -EFAULT; | |
ba0513b5 | 1266 | |
2a31b9db | 1267 | spin_lock(&kvm->mmu_lock); |
53eac7a8 PX |
1268 | for (offset = log->first_page, i = offset / BITS_PER_LONG, |
1269 | n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--; | |
2a31b9db PB |
1270 | i++, offset += BITS_PER_LONG) { |
1271 | unsigned long mask = *dirty_bitmap_buffer++; | |
1272 | atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i]; | |
1273 | if (!mask) | |
ba0513b5 MS |
1274 | continue; |
1275 | ||
2a31b9db | 1276 | mask &= atomic_long_fetch_andnot(mask, p); |
ba0513b5 | 1277 | |
2a31b9db PB |
1278 | /* |
1279 | * mask contains the bits that really have been cleared. This | |
1280 | * never includes any bits beyond the length of the memslot (if | |
1281 | * the length is not aligned to 64 pages), therefore it is not | |
1282 | * a problem if userspace sets them in log->dirty_bitmap. | |
1283 | */ | |
58d2930f | 1284 | if (mask) { |
2a31b9db | 1285 | *flush = true; |
58d2930f TY |
1286 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
1287 | offset, mask); | |
1288 | } | |
ba0513b5 | 1289 | } |
ba0513b5 | 1290 | spin_unlock(&kvm->mmu_lock); |
2a31b9db | 1291 | |
58d6db34 | 1292 | return 0; |
ba0513b5 | 1293 | } |
2a31b9db | 1294 | EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect); |
ba0513b5 MS |
1295 | #endif |
1296 | ||
db3fe4eb TY |
1297 | bool kvm_largepages_enabled(void) |
1298 | { | |
1299 | return largepages_enabled; | |
1300 | } | |
1301 | ||
54dee993 MT |
1302 | void kvm_disable_largepages(void) |
1303 | { | |
1304 | largepages_enabled = false; | |
1305 | } | |
1306 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1307 | ||
49c7754c GN |
1308 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1309 | { | |
1310 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1311 | } | |
a1f4d395 | 1312 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1313 | |
8e73485c PB |
1314 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1315 | { | |
1316 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1317 | } | |
1318 | ||
33e94154 | 1319 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 1320 | { |
bf3e05bc | 1321 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1322 | |
bbacc0c1 | 1323 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc | 1324 | memslot->flags & KVM_MEMSLOT_INVALID) |
33e94154 | 1325 | return false; |
e0d62c7f | 1326 | |
33e94154 | 1327 | return true; |
e0d62c7f IE |
1328 | } |
1329 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1330 | ||
8f0b1ab6 JR |
1331 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1332 | { | |
1333 | struct vm_area_struct *vma; | |
1334 | unsigned long addr, size; | |
1335 | ||
1336 | size = PAGE_SIZE; | |
1337 | ||
1338 | addr = gfn_to_hva(kvm, gfn); | |
1339 | if (kvm_is_error_hva(addr)) | |
1340 | return PAGE_SIZE; | |
1341 | ||
1342 | down_read(¤t->mm->mmap_sem); | |
1343 | vma = find_vma(current->mm, addr); | |
1344 | if (!vma) | |
1345 | goto out; | |
1346 | ||
1347 | size = vma_kernel_pagesize(vma); | |
1348 | ||
1349 | out: | |
1350 | up_read(¤t->mm->mmap_sem); | |
1351 | ||
1352 | return size; | |
1353 | } | |
1354 | ||
4d8b81ab XG |
1355 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1356 | { | |
1357 | return slot->flags & KVM_MEM_READONLY; | |
1358 | } | |
1359 | ||
4d8b81ab XG |
1360 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1361 | gfn_t *nr_pages, bool write) | |
539cb660 | 1362 | { |
bc6678a3 | 1363 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1364 | return KVM_HVA_ERR_BAD; |
48987781 | 1365 | |
4d8b81ab XG |
1366 | if (memslot_is_readonly(slot) && write) |
1367 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1368 | |
1369 | if (nr_pages) | |
1370 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1371 | ||
4d8b81ab | 1372 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1373 | } |
48987781 | 1374 | |
4d8b81ab XG |
1375 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1376 | gfn_t *nr_pages) | |
1377 | { | |
1378 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1379 | } |
48987781 | 1380 | |
4d8b81ab | 1381 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1382 | gfn_t gfn) |
4d8b81ab XG |
1383 | { |
1384 | return gfn_to_hva_many(slot, gfn, NULL); | |
1385 | } | |
1386 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1387 | ||
48987781 XG |
1388 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1389 | { | |
49c7754c | 1390 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1391 | } |
0d150298 | 1392 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1393 | |
8e73485c PB |
1394 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1395 | { | |
1396 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1399 | ||
86ab8cff | 1400 | /* |
970c0d4b WY |
1401 | * Return the hva of a @gfn and the R/W attribute if possible. |
1402 | * | |
1403 | * @slot: the kvm_memory_slot which contains @gfn | |
1404 | * @gfn: the gfn to be translated | |
1405 | * @writable: used to return the read/write attribute of the @slot if the hva | |
1406 | * is valid and @writable is not NULL | |
86ab8cff | 1407 | */ |
64d83126 CD |
1408 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1409 | gfn_t gfn, bool *writable) | |
86ab8cff | 1410 | { |
a2ac07fe GN |
1411 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1412 | ||
1413 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1414 | *writable = !memslot_is_readonly(slot); |
1415 | ||
a2ac07fe | 1416 | return hva; |
86ab8cff XG |
1417 | } |
1418 | ||
64d83126 CD |
1419 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1420 | { | |
1421 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1422 | ||
1423 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1424 | } | |
1425 | ||
8e73485c PB |
1426 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1427 | { | |
1428 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1429 | ||
1430 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1431 | } | |
1432 | ||
fafc3dba HY |
1433 | static inline int check_user_page_hwpoison(unsigned long addr) |
1434 | { | |
0d731759 | 1435 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 1436 | |
0d731759 | 1437 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
1438 | return rc == -EHWPOISON; |
1439 | } | |
1440 | ||
2fc84311 | 1441 | /* |
b9b33da2 PB |
1442 | * The fast path to get the writable pfn which will be stored in @pfn, |
1443 | * true indicates success, otherwise false is returned. It's also the | |
1444 | * only part that runs if we can are in atomic context. | |
2fc84311 | 1445 | */ |
b9b33da2 PB |
1446 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
1447 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 1448 | { |
8d4e1288 | 1449 | struct page *page[1]; |
2fc84311 | 1450 | int npages; |
954bbbc2 | 1451 | |
12ce13fe XG |
1452 | /* |
1453 | * Fast pin a writable pfn only if it is a write fault request | |
1454 | * or the caller allows to map a writable pfn for a read fault | |
1455 | * request. | |
1456 | */ | |
1457 | if (!(write_fault || writable)) | |
1458 | return false; | |
612819c3 | 1459 | |
2fc84311 XG |
1460 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1461 | if (npages == 1) { | |
1462 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1463 | |
2fc84311 XG |
1464 | if (writable) |
1465 | *writable = true; | |
1466 | return true; | |
1467 | } | |
af585b92 | 1468 | |
2fc84311 XG |
1469 | return false; |
1470 | } | |
612819c3 | 1471 | |
2fc84311 XG |
1472 | /* |
1473 | * The slow path to get the pfn of the specified host virtual address, | |
1474 | * 1 indicates success, -errno is returned if error is detected. | |
1475 | */ | |
1476 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 1477 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 1478 | { |
ce53053c AV |
1479 | unsigned int flags = FOLL_HWPOISON; |
1480 | struct page *page; | |
2fc84311 | 1481 | int npages = 0; |
612819c3 | 1482 | |
2fc84311 XG |
1483 | might_sleep(); |
1484 | ||
1485 | if (writable) | |
1486 | *writable = write_fault; | |
1487 | ||
ce53053c AV |
1488 | if (write_fault) |
1489 | flags |= FOLL_WRITE; | |
1490 | if (async) | |
1491 | flags |= FOLL_NOWAIT; | |
d4944b0e | 1492 | |
ce53053c | 1493 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
1494 | if (npages != 1) |
1495 | return npages; | |
1496 | ||
1497 | /* map read fault as writable if possible */ | |
12ce13fe | 1498 | if (unlikely(!write_fault) && writable) { |
ce53053c | 1499 | struct page *wpage; |
2fc84311 | 1500 | |
ce53053c | 1501 | if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { |
2fc84311 | 1502 | *writable = true; |
ce53053c AV |
1503 | put_page(page); |
1504 | page = wpage; | |
612819c3 | 1505 | } |
887c08ac | 1506 | } |
ce53053c | 1507 | *pfn = page_to_pfn(page); |
2fc84311 XG |
1508 | return npages; |
1509 | } | |
539cb660 | 1510 | |
4d8b81ab XG |
1511 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1512 | { | |
1513 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1514 | return false; | |
2e2e3738 | 1515 | |
4d8b81ab XG |
1516 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1517 | return false; | |
887c08ac | 1518 | |
4d8b81ab XG |
1519 | return true; |
1520 | } | |
bf998156 | 1521 | |
92176a8e PB |
1522 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
1523 | unsigned long addr, bool *async, | |
a340b3e2 KA |
1524 | bool write_fault, bool *writable, |
1525 | kvm_pfn_t *p_pfn) | |
92176a8e | 1526 | { |
add6a0cd PB |
1527 | unsigned long pfn; |
1528 | int r; | |
1529 | ||
1530 | r = follow_pfn(vma, addr, &pfn); | |
1531 | if (r) { | |
1532 | /* | |
1533 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1534 | * not call the fault handler, so do it here. | |
1535 | */ | |
1536 | bool unlocked = false; | |
1537 | r = fixup_user_fault(current, current->mm, addr, | |
1538 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1539 | &unlocked); | |
1540 | if (unlocked) | |
1541 | return -EAGAIN; | |
1542 | if (r) | |
1543 | return r; | |
1544 | ||
1545 | r = follow_pfn(vma, addr, &pfn); | |
1546 | if (r) | |
1547 | return r; | |
1548 | ||
1549 | } | |
1550 | ||
a340b3e2 KA |
1551 | if (writable) |
1552 | *writable = true; | |
add6a0cd PB |
1553 | |
1554 | /* | |
1555 | * Get a reference here because callers of *hva_to_pfn* and | |
1556 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1557 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1558 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1559 | * simply do nothing for reserved pfns. | |
1560 | * | |
1561 | * Whoever called remap_pfn_range is also going to call e.g. | |
1562 | * unmap_mapping_range before the underlying pages are freed, | |
1563 | * causing a call to our MMU notifier. | |
1564 | */ | |
1565 | kvm_get_pfn(pfn); | |
1566 | ||
1567 | *p_pfn = pfn; | |
92176a8e PB |
1568 | return 0; |
1569 | } | |
1570 | ||
12ce13fe XG |
1571 | /* |
1572 | * Pin guest page in memory and return its pfn. | |
1573 | * @addr: host virtual address which maps memory to the guest | |
1574 | * @atomic: whether this function can sleep | |
1575 | * @async: whether this function need to wait IO complete if the | |
1576 | * host page is not in the memory | |
1577 | * @write_fault: whether we should get a writable host page | |
1578 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1579 | * | |
1580 | * The function will map a writable host page for these two cases: | |
1581 | * 1): @write_fault = true | |
1582 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1583 | * whether the mapping is writable. | |
1584 | */ | |
ba049e93 | 1585 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
1586 | bool write_fault, bool *writable) |
1587 | { | |
1588 | struct vm_area_struct *vma; | |
ba049e93 | 1589 | kvm_pfn_t pfn = 0; |
92176a8e | 1590 | int npages, r; |
2e2e3738 | 1591 | |
2fc84311 XG |
1592 | /* we can do it either atomically or asynchronously, not both */ |
1593 | BUG_ON(atomic && async); | |
8d4e1288 | 1594 | |
b9b33da2 | 1595 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
1596 | return pfn; |
1597 | ||
1598 | if (atomic) | |
1599 | return KVM_PFN_ERR_FAULT; | |
1600 | ||
1601 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1602 | if (npages == 1) | |
1603 | return pfn; | |
8d4e1288 | 1604 | |
2fc84311 XG |
1605 | down_read(¤t->mm->mmap_sem); |
1606 | if (npages == -EHWPOISON || | |
1607 | (!async && check_user_page_hwpoison(addr))) { | |
1608 | pfn = KVM_PFN_ERR_HWPOISON; | |
1609 | goto exit; | |
1610 | } | |
1611 | ||
add6a0cd | 1612 | retry: |
2fc84311 XG |
1613 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
1614 | ||
1615 | if (vma == NULL) | |
1616 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 1617 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 1618 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
add6a0cd PB |
1619 | if (r == -EAGAIN) |
1620 | goto retry; | |
92176a8e PB |
1621 | if (r < 0) |
1622 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 1623 | } else { |
4d8b81ab | 1624 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1625 | *async = true; |
1626 | pfn = KVM_PFN_ERR_FAULT; | |
1627 | } | |
1628 | exit: | |
1629 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1630 | return pfn; |
35149e21 AL |
1631 | } |
1632 | ||
ba049e93 DW |
1633 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
1634 | bool atomic, bool *async, bool write_fault, | |
1635 | bool *writable) | |
887c08ac | 1636 | { |
4d8b81ab XG |
1637 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1638 | ||
b2740d35 PB |
1639 | if (addr == KVM_HVA_ERR_RO_BAD) { |
1640 | if (writable) | |
1641 | *writable = false; | |
4d8b81ab | 1642 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 1643 | } |
4d8b81ab | 1644 | |
b2740d35 PB |
1645 | if (kvm_is_error_hva(addr)) { |
1646 | if (writable) | |
1647 | *writable = false; | |
81c52c56 | 1648 | return KVM_PFN_NOSLOT; |
b2740d35 | 1649 | } |
4d8b81ab XG |
1650 | |
1651 | /* Do not map writable pfn in the readonly memslot. */ | |
1652 | if (writable && memslot_is_readonly(slot)) { | |
1653 | *writable = false; | |
1654 | writable = NULL; | |
1655 | } | |
1656 | ||
1657 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1658 | writable); | |
887c08ac | 1659 | } |
3520469d | 1660 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1661 | |
ba049e93 | 1662 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
1663 | bool *writable) |
1664 | { | |
e37afc6e PB |
1665 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1666 | write_fault, writable); | |
612819c3 MT |
1667 | } |
1668 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1669 | ||
ba049e93 | 1670 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1671 | { |
4d8b81ab | 1672 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1673 | } |
e37afc6e | 1674 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1675 | |
ba049e93 | 1676 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1677 | { |
4d8b81ab | 1678 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1679 | } |
037d92dc | 1680 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1681 | |
ba049e93 | 1682 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1683 | { |
1684 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1685 | } | |
1686 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1687 | ||
ba049e93 | 1688 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1689 | { |
1690 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1693 | ||
ba049e93 | 1694 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1695 | { |
1696 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1699 | ||
ba049e93 | 1700 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1701 | { |
1702 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1705 | ||
d9ef13c2 PB |
1706 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1707 | struct page **pages, int nr_pages) | |
48987781 XG |
1708 | { |
1709 | unsigned long addr; | |
076b925d | 1710 | gfn_t entry = 0; |
48987781 | 1711 | |
d9ef13c2 | 1712 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
1713 | if (kvm_is_error_hva(addr)) |
1714 | return -1; | |
1715 | ||
1716 | if (entry < nr_pages) | |
1717 | return 0; | |
1718 | ||
1719 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1720 | } | |
1721 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1722 | ||
ba049e93 | 1723 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 1724 | { |
81c52c56 | 1725 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1726 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1727 | |
bf4bea8e | 1728 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1729 | WARN_ON(1); |
6cede2e6 | 1730 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1731 | } |
a2766325 XG |
1732 | |
1733 | return pfn_to_page(pfn); | |
1734 | } | |
1735 | ||
35149e21 AL |
1736 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1737 | { | |
ba049e93 | 1738 | kvm_pfn_t pfn; |
2e2e3738 AL |
1739 | |
1740 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1741 | |
a2766325 | 1742 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
1743 | } |
1744 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1745 | ||
e45adf66 KA |
1746 | static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn, |
1747 | struct kvm_host_map *map) | |
1748 | { | |
1749 | kvm_pfn_t pfn; | |
1750 | void *hva = NULL; | |
1751 | struct page *page = KVM_UNMAPPED_PAGE; | |
1752 | ||
1753 | if (!map) | |
1754 | return -EINVAL; | |
1755 | ||
1756 | pfn = gfn_to_pfn_memslot(slot, gfn); | |
1757 | if (is_error_noslot_pfn(pfn)) | |
1758 | return -EINVAL; | |
1759 | ||
1760 | if (pfn_valid(pfn)) { | |
1761 | page = pfn_to_page(pfn); | |
1762 | hva = kmap(page); | |
d30b214d | 1763 | #ifdef CONFIG_HAS_IOMEM |
e45adf66 KA |
1764 | } else { |
1765 | hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB); | |
d30b214d | 1766 | #endif |
e45adf66 KA |
1767 | } |
1768 | ||
1769 | if (!hva) | |
1770 | return -EFAULT; | |
1771 | ||
1772 | map->page = page; | |
1773 | map->hva = hva; | |
1774 | map->pfn = pfn; | |
1775 | map->gfn = gfn; | |
1776 | ||
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) | |
1781 | { | |
1782 | return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, map); | |
1783 | } | |
1784 | EXPORT_SYMBOL_GPL(kvm_vcpu_map); | |
1785 | ||
1786 | void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, | |
1787 | bool dirty) | |
1788 | { | |
1789 | if (!map) | |
1790 | return; | |
1791 | ||
1792 | if (!map->hva) | |
1793 | return; | |
1794 | ||
b614c602 | 1795 | if (map->page != KVM_UNMAPPED_PAGE) |
e45adf66 | 1796 | kunmap(map->page); |
eb1f2f38 | 1797 | #ifdef CONFIG_HAS_IOMEM |
e45adf66 KA |
1798 | else |
1799 | memunmap(map->hva); | |
eb1f2f38 | 1800 | #endif |
e45adf66 KA |
1801 | |
1802 | if (dirty) { | |
1803 | kvm_vcpu_mark_page_dirty(vcpu, map->gfn); | |
1804 | kvm_release_pfn_dirty(map->pfn); | |
1805 | } else { | |
1806 | kvm_release_pfn_clean(map->pfn); | |
1807 | } | |
1808 | ||
1809 | map->hva = NULL; | |
1810 | map->page = NULL; | |
1811 | } | |
1812 | EXPORT_SYMBOL_GPL(kvm_vcpu_unmap); | |
1813 | ||
8e73485c PB |
1814 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
1815 | { | |
ba049e93 | 1816 | kvm_pfn_t pfn; |
8e73485c PB |
1817 | |
1818 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1819 | ||
1820 | return kvm_pfn_to_page(pfn); | |
1821 | } | |
1822 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1823 | ||
b4231d61 IE |
1824 | void kvm_release_page_clean(struct page *page) |
1825 | { | |
32cad84f XG |
1826 | WARN_ON(is_error_page(page)); |
1827 | ||
35149e21 | 1828 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1829 | } |
1830 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1831 | ||
ba049e93 | 1832 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 1833 | { |
bf4bea8e | 1834 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1835 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1836 | } |
1837 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1838 | ||
b4231d61 | 1839 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1840 | { |
a2766325 XG |
1841 | WARN_ON(is_error_page(page)); |
1842 | ||
35149e21 AL |
1843 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1844 | } | |
1845 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1846 | ||
f7a6509f | 1847 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
1848 | { |
1849 | kvm_set_pfn_dirty(pfn); | |
1850 | kvm_release_pfn_clean(pfn); | |
1851 | } | |
f7a6509f | 1852 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 1853 | |
ba049e93 | 1854 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 1855 | { |
bf4bea8e | 1856 | if (!kvm_is_reserved_pfn(pfn)) { |
2e2e3738 | 1857 | struct page *page = pfn_to_page(pfn); |
f95ef0cd | 1858 | |
8f946da7 | 1859 | SetPageDirty(page); |
2e2e3738 | 1860 | } |
8a7ae055 | 1861 | } |
35149e21 AL |
1862 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1863 | ||
ba049e93 | 1864 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 1865 | { |
bf4bea8e | 1866 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1867 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1868 | } |
1869 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1870 | ||
ba049e93 | 1871 | void kvm_get_pfn(kvm_pfn_t pfn) |
35149e21 | 1872 | { |
bf4bea8e | 1873 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1874 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1875 | } |
1876 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1877 | |
195aefde IE |
1878 | static int next_segment(unsigned long len, int offset) |
1879 | { | |
1880 | if (len > PAGE_SIZE - offset) | |
1881 | return PAGE_SIZE - offset; | |
1882 | else | |
1883 | return len; | |
1884 | } | |
1885 | ||
8e73485c PB |
1886 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
1887 | void *data, int offset, int len) | |
195aefde | 1888 | { |
e0506bcb IE |
1889 | int r; |
1890 | unsigned long addr; | |
195aefde | 1891 | |
8e73485c | 1892 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
1893 | if (kvm_is_error_hva(addr)) |
1894 | return -EFAULT; | |
3180a7fc | 1895 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1896 | if (r) |
195aefde | 1897 | return -EFAULT; |
195aefde IE |
1898 | return 0; |
1899 | } | |
8e73485c PB |
1900 | |
1901 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1902 | int len) | |
1903 | { | |
1904 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1905 | ||
1906 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1907 | } | |
195aefde IE |
1908 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1909 | ||
8e73485c PB |
1910 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
1911 | int offset, int len) | |
1912 | { | |
1913 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1914 | ||
1915 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1916 | } | |
1917 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1918 | ||
195aefde IE |
1919 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1920 | { | |
1921 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1922 | int seg; | |
1923 | int offset = offset_in_page(gpa); | |
1924 | int ret; | |
1925 | ||
1926 | while ((seg = next_segment(len, offset)) != 0) { | |
1927 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1928 | if (ret < 0) | |
1929 | return ret; | |
1930 | offset = 0; | |
1931 | len -= seg; | |
1932 | data += seg; | |
1933 | ++gfn; | |
1934 | } | |
1935 | return 0; | |
1936 | } | |
1937 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1938 | ||
8e73485c | 1939 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 1940 | { |
7ec54588 | 1941 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 1942 | int seg; |
7ec54588 | 1943 | int offset = offset_in_page(gpa); |
8e73485c PB |
1944 | int ret; |
1945 | ||
1946 | while ((seg = next_segment(len, offset)) != 0) { | |
1947 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
1948 | if (ret < 0) | |
1949 | return ret; | |
1950 | offset = 0; | |
1951 | len -= seg; | |
1952 | data += seg; | |
1953 | ++gfn; | |
1954 | } | |
1955 | return 0; | |
1956 | } | |
1957 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 1958 | |
8e73485c PB |
1959 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1960 | void *data, int offset, unsigned long len) | |
1961 | { | |
1962 | int r; | |
1963 | unsigned long addr; | |
1964 | ||
1965 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
1966 | if (kvm_is_error_hva(addr)) |
1967 | return -EFAULT; | |
0aac03f0 | 1968 | pagefault_disable(); |
3180a7fc | 1969 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1970 | pagefault_enable(); |
7ec54588 MT |
1971 | if (r) |
1972 | return -EFAULT; | |
1973 | return 0; | |
1974 | } | |
7ec54588 | 1975 | |
8e73485c PB |
1976 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1977 | unsigned long len) | |
1978 | { | |
1979 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1980 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1981 | int offset = offset_in_page(gpa); | |
1982 | ||
1983 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1984 | } | |
1985 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1986 | ||
1987 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1988 | void *data, unsigned long len) | |
1989 | { | |
1990 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1991 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1992 | int offset = offset_in_page(gpa); | |
1993 | ||
1994 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1995 | } | |
1996 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1997 | ||
1998 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1999 | const void *data, int offset, int len) | |
195aefde | 2000 | { |
e0506bcb IE |
2001 | int r; |
2002 | unsigned long addr; | |
195aefde | 2003 | |
251eb841 | 2004 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
2005 | if (kvm_is_error_hva(addr)) |
2006 | return -EFAULT; | |
8b0cedff | 2007 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 2008 | if (r) |
195aefde | 2009 | return -EFAULT; |
bc009e43 | 2010 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
2011 | return 0; |
2012 | } | |
8e73485c PB |
2013 | |
2014 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
2015 | const void *data, int offset, int len) | |
2016 | { | |
2017 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2018 | ||
2019 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2020 | } | |
195aefde IE |
2021 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
2022 | ||
8e73485c PB |
2023 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
2024 | const void *data, int offset, int len) | |
2025 | { | |
2026 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2027 | ||
2028 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2029 | } | |
2030 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
2031 | ||
195aefde IE |
2032 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
2033 | unsigned long len) | |
2034 | { | |
2035 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2036 | int seg; | |
2037 | int offset = offset_in_page(gpa); | |
2038 | int ret; | |
2039 | ||
2040 | while ((seg = next_segment(len, offset)) != 0) { | |
2041 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
2042 | if (ret < 0) | |
2043 | return ret; | |
2044 | offset = 0; | |
2045 | len -= seg; | |
2046 | data += seg; | |
2047 | ++gfn; | |
2048 | } | |
2049 | return 0; | |
2050 | } | |
ff651cb6 | 2051 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 2052 | |
8e73485c PB |
2053 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
2054 | unsigned long len) | |
2055 | { | |
2056 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2057 | int seg; | |
2058 | int offset = offset_in_page(gpa); | |
2059 | int ret; | |
2060 | ||
2061 | while ((seg = next_segment(len, offset)) != 0) { | |
2062 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
2063 | if (ret < 0) | |
2064 | return ret; | |
2065 | offset = 0; | |
2066 | len -= seg; | |
2067 | data += seg; | |
2068 | ++gfn; | |
2069 | } | |
2070 | return 0; | |
2071 | } | |
2072 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
2073 | ||
5a2d4365 PB |
2074 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
2075 | struct gfn_to_hva_cache *ghc, | |
2076 | gpa_t gpa, unsigned long len) | |
49c7754c | 2077 | { |
49c7754c | 2078 | int offset = offset_in_page(gpa); |
8f964525 AH |
2079 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
2080 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
2081 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
2082 | gfn_t nr_pages_avail; | |
f1b9dd5e | 2083 | int r = start_gfn <= end_gfn ? 0 : -EINVAL; |
49c7754c GN |
2084 | |
2085 | ghc->gpa = gpa; | |
2086 | ghc->generation = slots->generation; | |
8f964525 | 2087 | ghc->len = len; |
f1b9dd5e JM |
2088 | ghc->hva = KVM_HVA_ERR_BAD; |
2089 | ||
2090 | /* | |
2091 | * If the requested region crosses two memslots, we still | |
2092 | * verify that the entire region is valid here. | |
2093 | */ | |
2094 | while (!r && start_gfn <= end_gfn) { | |
2095 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
2096 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
2097 | &nr_pages_avail); | |
2098 | if (kvm_is_error_hva(ghc->hva)) | |
2099 | r = -EFAULT; | |
2100 | start_gfn += nr_pages_avail; | |
2101 | } | |
2102 | ||
2103 | /* Use the slow path for cross page reads and writes. */ | |
2104 | if (!r && nr_pages_needed == 1) | |
49c7754c | 2105 | ghc->hva += offset; |
f1b9dd5e | 2106 | else |
8f964525 | 2107 | ghc->memslot = NULL; |
f1b9dd5e JM |
2108 | |
2109 | return r; | |
49c7754c | 2110 | } |
5a2d4365 | 2111 | |
4e335d9e | 2112 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
2113 | gpa_t gpa, unsigned long len) |
2114 | { | |
4e335d9e | 2115 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
2116 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
2117 | } | |
4e335d9e | 2118 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 2119 | |
4e335d9e | 2120 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
7a86dab8 JM |
2121 | void *data, unsigned int offset, |
2122 | unsigned long len) | |
49c7754c | 2123 | { |
4e335d9e | 2124 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 2125 | int r; |
4ec6e863 | 2126 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 2127 | |
4ec6e863 | 2128 | BUG_ON(len + offset > ghc->len); |
8f964525 | 2129 | |
49c7754c | 2130 | if (slots->generation != ghc->generation) |
5a2d4365 | 2131 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2132 | |
2133 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2134 | return kvm_write_guest(kvm, gpa, data, len); |
49c7754c GN |
2135 | |
2136 | if (kvm_is_error_hva(ghc->hva)) | |
2137 | return -EFAULT; | |
2138 | ||
4ec6e863 | 2139 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
2140 | if (r) |
2141 | return -EFAULT; | |
4ec6e863 | 2142 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
2143 | |
2144 | return 0; | |
2145 | } | |
4e335d9e | 2146 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 2147 | |
4e335d9e PB |
2148 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2149 | void *data, unsigned long len) | |
4ec6e863 | 2150 | { |
4e335d9e | 2151 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 2152 | } |
4e335d9e | 2153 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 2154 | |
4e335d9e PB |
2155 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2156 | void *data, unsigned long len) | |
e03b644f | 2157 | { |
4e335d9e | 2158 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f GN |
2159 | int r; |
2160 | ||
8f964525 AH |
2161 | BUG_ON(len > ghc->len); |
2162 | ||
e03b644f | 2163 | if (slots->generation != ghc->generation) |
5a2d4365 | 2164 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2165 | |
2166 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2167 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
e03b644f GN |
2168 | |
2169 | if (kvm_is_error_hva(ghc->hva)) | |
2170 | return -EFAULT; | |
2171 | ||
2172 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2173 | if (r) | |
2174 | return -EFAULT; | |
2175 | ||
2176 | return 0; | |
2177 | } | |
4e335d9e | 2178 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 2179 | |
195aefde IE |
2180 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
2181 | { | |
8a3caa6d HC |
2182 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
2183 | ||
2184 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
2185 | } |
2186 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2187 | ||
2188 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2189 | { | |
2190 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2191 | int seg; | |
2192 | int offset = offset_in_page(gpa); | |
2193 | int ret; | |
2194 | ||
bfda0e84 | 2195 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
2196 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
2197 | if (ret < 0) | |
2198 | return ret; | |
2199 | offset = 0; | |
2200 | len -= seg; | |
2201 | ++gfn; | |
2202 | } | |
2203 | return 0; | |
2204 | } | |
2205 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2206 | ||
bc009e43 | 2207 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 2208 | gfn_t gfn) |
6aa8b732 | 2209 | { |
7e9d619d RR |
2210 | if (memslot && memslot->dirty_bitmap) { |
2211 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 2212 | |
b74ca3b3 | 2213 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
2214 | } |
2215 | } | |
2216 | ||
49c7754c GN |
2217 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
2218 | { | |
2219 | struct kvm_memory_slot *memslot; | |
2220 | ||
2221 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 2222 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 2223 | } |
2ba9f0d8 | 2224 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 2225 | |
8e73485c PB |
2226 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
2227 | { | |
2228 | struct kvm_memory_slot *memslot; | |
2229 | ||
2230 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2231 | mark_page_dirty_in_slot(memslot, gfn); | |
2232 | } | |
2233 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2234 | ||
20b7035c JS |
2235 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
2236 | { | |
2237 | if (!vcpu->sigset_active) | |
2238 | return; | |
2239 | ||
2240 | /* | |
2241 | * This does a lockless modification of ->real_blocked, which is fine | |
2242 | * because, only current can change ->real_blocked and all readers of | |
2243 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2244 | * of ->blocked. | |
2245 | */ | |
2246 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2247 | } | |
2248 | ||
2249 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2250 | { | |
2251 | if (!vcpu->sigset_active) | |
2252 | return; | |
2253 | ||
2254 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2255 | sigemptyset(¤t->real_blocked); | |
2256 | } | |
2257 | ||
aca6ff29 WL |
2258 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
2259 | { | |
dee339b5 | 2260 | unsigned int old, val, grow, grow_start; |
aca6ff29 | 2261 | |
2cbd7824 | 2262 | old = val = vcpu->halt_poll_ns; |
dee339b5 | 2263 | grow_start = READ_ONCE(halt_poll_ns_grow_start); |
6b6de68c | 2264 | grow = READ_ONCE(halt_poll_ns_grow); |
7fa08e71 NW |
2265 | if (!grow) |
2266 | goto out; | |
2267 | ||
dee339b5 NW |
2268 | val *= grow; |
2269 | if (val < grow_start) | |
2270 | val = grow_start; | |
aca6ff29 | 2271 | |
313f636d DM |
2272 | if (val > halt_poll_ns) |
2273 | val = halt_poll_ns; | |
2274 | ||
aca6ff29 | 2275 | vcpu->halt_poll_ns = val; |
7fa08e71 | 2276 | out: |
2cbd7824 | 2277 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2278 | } |
2279 | ||
2280 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2281 | { | |
6b6de68c | 2282 | unsigned int old, val, shrink; |
aca6ff29 | 2283 | |
2cbd7824 | 2284 | old = val = vcpu->halt_poll_ns; |
6b6de68c CB |
2285 | shrink = READ_ONCE(halt_poll_ns_shrink); |
2286 | if (shrink == 0) | |
aca6ff29 WL |
2287 | val = 0; |
2288 | else | |
6b6de68c | 2289 | val /= shrink; |
aca6ff29 WL |
2290 | |
2291 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 2292 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2293 | } |
2294 | ||
f7819512 PB |
2295 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
2296 | { | |
50c28f21 JS |
2297 | int ret = -EINTR; |
2298 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
2299 | ||
f7819512 PB |
2300 | if (kvm_arch_vcpu_runnable(vcpu)) { |
2301 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 2302 | goto out; |
f7819512 PB |
2303 | } |
2304 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 2305 | goto out; |
f7819512 | 2306 | if (signal_pending(current)) |
50c28f21 | 2307 | goto out; |
f7819512 | 2308 | |
50c28f21 JS |
2309 | ret = 0; |
2310 | out: | |
2311 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2312 | return ret; | |
f7819512 PB |
2313 | } |
2314 | ||
b6958ce4 ED |
2315 | /* |
2316 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2317 | */ | |
8776e519 | 2318 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 2319 | { |
f7819512 | 2320 | ktime_t start, cur; |
8577370f | 2321 | DECLARE_SWAITQUEUE(wait); |
f7819512 | 2322 | bool waited = false; |
aca6ff29 | 2323 | u64 block_ns; |
f7819512 | 2324 | |
07ab0f8d MZ |
2325 | kvm_arch_vcpu_blocking(vcpu); |
2326 | ||
f7819512 | 2327 | start = cur = ktime_get(); |
cdd6ad3a | 2328 | if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) { |
19020f8a | 2329 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
f95ef0cd | 2330 | |
62bea5bf | 2331 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2332 | do { |
2333 | /* | |
2334 | * This sets KVM_REQ_UNHALT if an interrupt | |
2335 | * arrives. | |
2336 | */ | |
2337 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2338 | ++vcpu->stat.halt_successful_poll; | |
3491caf2 CB |
2339 | if (!vcpu_valid_wakeup(vcpu)) |
2340 | ++vcpu->stat.halt_poll_invalid; | |
f7819512 PB |
2341 | goto out; |
2342 | } | |
2343 | cur = ktime_get(); | |
2344 | } while (single_task_running() && ktime_before(cur, stop)); | |
2345 | } | |
e5c239cf MT |
2346 | |
2347 | for (;;) { | |
b3dae109 | 2348 | prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
e5c239cf | 2349 | |
f7819512 | 2350 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2351 | break; |
2352 | ||
f7819512 | 2353 | waited = true; |
b6958ce4 | 2354 | schedule(); |
b6958ce4 | 2355 | } |
d3bef15f | 2356 | |
8577370f | 2357 | finish_swait(&vcpu->wq, &wait); |
f7819512 | 2358 | cur = ktime_get(); |
f7819512 | 2359 | out: |
07ab0f8d | 2360 | kvm_arch_vcpu_unblocking(vcpu); |
aca6ff29 WL |
2361 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2362 | ||
2086d320 CB |
2363 | if (!vcpu_valid_wakeup(vcpu)) |
2364 | shrink_halt_poll_ns(vcpu); | |
2365 | else if (halt_poll_ns) { | |
aca6ff29 WL |
2366 | if (block_ns <= vcpu->halt_poll_ns) |
2367 | ; | |
2368 | /* we had a long block, shrink polling */ | |
2086d320 | 2369 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) |
aca6ff29 WL |
2370 | shrink_halt_poll_ns(vcpu); |
2371 | /* we had a short halt and our poll time is too small */ | |
2372 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2373 | block_ns < halt_poll_ns) | |
2374 | grow_halt_poll_ns(vcpu); | |
edb9272f WL |
2375 | } else |
2376 | vcpu->halt_poll_ns = 0; | |
aca6ff29 | 2377 | |
3491caf2 CB |
2378 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
2379 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 2380 | } |
2ba9f0d8 | 2381 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2382 | |
178f02ff | 2383 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 2384 | { |
8577370f | 2385 | struct swait_queue_head *wqp; |
b6d33834 CD |
2386 | |
2387 | wqp = kvm_arch_vcpu_wq(vcpu); | |
5e0018b3 | 2388 | if (swq_has_sleeper(wqp)) { |
b3dae109 | 2389 | swake_up_one(wqp); |
d73eb57b | 2390 | WRITE_ONCE(vcpu->ready, true); |
b6d33834 | 2391 | ++vcpu->stat.halt_wakeup; |
178f02ff | 2392 | return true; |
b6d33834 CD |
2393 | } |
2394 | ||
178f02ff | 2395 | return false; |
dd1a4cc1 RK |
2396 | } |
2397 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2398 | ||
0266c894 | 2399 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
2400 | /* |
2401 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2402 | */ | |
2403 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2404 | { | |
2405 | int me; | |
2406 | int cpu = vcpu->cpu; | |
2407 | ||
178f02ff RK |
2408 | if (kvm_vcpu_wake_up(vcpu)) |
2409 | return; | |
2410 | ||
b6d33834 CD |
2411 | me = get_cpu(); |
2412 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2413 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2414 | smp_send_reschedule(cpu); | |
2415 | put_cpu(); | |
2416 | } | |
a20ed54d | 2417 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 2418 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2419 | |
fa93384f | 2420 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2421 | { |
2422 | struct pid *pid; | |
2423 | struct task_struct *task = NULL; | |
fa93384f | 2424 | int ret = 0; |
41628d33 KW |
2425 | |
2426 | rcu_read_lock(); | |
2427 | pid = rcu_dereference(target->pid); | |
2428 | if (pid) | |
27fbe64b | 2429 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2430 | rcu_read_unlock(); |
2431 | if (!task) | |
c45c528e | 2432 | return ret; |
c45c528e | 2433 | ret = yield_to(task, 1); |
41628d33 | 2434 | put_task_struct(task); |
c45c528e R |
2435 | |
2436 | return ret; | |
41628d33 KW |
2437 | } |
2438 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2439 | ||
06e48c51 R |
2440 | /* |
2441 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2442 | * Most eligible candidate to yield is decided by following heuristics: | |
2443 | * | |
2444 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2445 | * (preempted lock holder), indicated by @in_spin_loop. | |
2446 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2447 | * | |
2448 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2449 | * chance last time (mostly it has become eligible now since we have probably | |
2450 | * yielded to lockholder in last iteration. This is done by toggling | |
2451 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2452 | * | |
2453 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2454 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2455 | * burning. Giving priority for a potential lock-holder increases lock | |
2456 | * progress. | |
2457 | * | |
2458 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2459 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2460 | * and continue with next VCPU and so on. | |
2461 | */ | |
7940876e | 2462 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2463 | { |
4a55dd72 | 2464 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2465 | bool eligible; |
2466 | ||
2467 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2468 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2469 | |
2470 | if (vcpu->spin_loop.in_spin_loop) | |
2471 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2472 | ||
2473 | return eligible; | |
4a55dd72 SW |
2474 | #else |
2475 | return true; | |
06e48c51 | 2476 | #endif |
4a55dd72 | 2477 | } |
c45c528e | 2478 | |
17e433b5 WL |
2479 | /* |
2480 | * Unlike kvm_arch_vcpu_runnable, this function is called outside | |
2481 | * a vcpu_load/vcpu_put pair. However, for most architectures | |
2482 | * kvm_arch_vcpu_runnable does not require vcpu_load. | |
2483 | */ | |
2484 | bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) | |
2485 | { | |
2486 | return kvm_arch_vcpu_runnable(vcpu); | |
2487 | } | |
2488 | ||
2489 | static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu) | |
2490 | { | |
2491 | if (kvm_arch_dy_runnable(vcpu)) | |
2492 | return true; | |
2493 | ||
2494 | #ifdef CONFIG_KVM_ASYNC_PF | |
2495 | if (!list_empty_careful(&vcpu->async_pf.done)) | |
2496 | return true; | |
2497 | #endif | |
2498 | ||
2499 | return false; | |
2500 | } | |
2501 | ||
199b5763 | 2502 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 2503 | { |
217ece61 RR |
2504 | struct kvm *kvm = me->kvm; |
2505 | struct kvm_vcpu *vcpu; | |
2506 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2507 | int yielded = 0; | |
c45c528e | 2508 | int try = 3; |
217ece61 RR |
2509 | int pass; |
2510 | int i; | |
d255f4f2 | 2511 | |
4c088493 | 2512 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2513 | /* |
2514 | * We boost the priority of a VCPU that is runnable but not | |
2515 | * currently running, because it got preempted by something | |
2516 | * else and called schedule in __vcpu_run. Hopefully that | |
2517 | * VCPU is holding the lock that we need and will release it. | |
2518 | * We approximate round-robin by starting at the last boosted VCPU. | |
2519 | */ | |
c45c528e | 2520 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2521 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2522 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2523 | i = last_boosted_vcpu; |
2524 | continue; | |
2525 | } else if (pass && i > last_boosted_vcpu) | |
2526 | break; | |
d73eb57b | 2527 | if (!READ_ONCE(vcpu->ready)) |
7bc7ae25 | 2528 | continue; |
217ece61 RR |
2529 | if (vcpu == me) |
2530 | continue; | |
17e433b5 | 2531 | if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu)) |
217ece61 | 2532 | continue; |
046ddeed WL |
2533 | if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode && |
2534 | !kvm_arch_vcpu_in_kernel(vcpu)) | |
199b5763 | 2535 | continue; |
06e48c51 R |
2536 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2537 | continue; | |
c45c528e R |
2538 | |
2539 | yielded = kvm_vcpu_yield_to(vcpu); | |
2540 | if (yielded > 0) { | |
217ece61 | 2541 | kvm->last_boosted_vcpu = i; |
217ece61 | 2542 | break; |
c45c528e R |
2543 | } else if (yielded < 0) { |
2544 | try--; | |
2545 | if (!try) | |
2546 | break; | |
217ece61 | 2547 | } |
217ece61 RR |
2548 | } |
2549 | } | |
4c088493 | 2550 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2551 | |
2552 | /* Ensure vcpu is not eligible during next spinloop */ | |
2553 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2554 | } |
2555 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2556 | ||
1499fa80 | 2557 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 2558 | { |
11bac800 | 2559 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
2560 | struct page *page; |
2561 | ||
e4a533a4 | 2562 | if (vmf->pgoff == 0) |
039576c0 | 2563 | page = virt_to_page(vcpu->run); |
09566765 | 2564 | #ifdef CONFIG_X86 |
e4a533a4 | 2565 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2566 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 2567 | #endif |
4b4357e0 | 2568 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
2569 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
2570 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2571 | #endif |
039576c0 | 2572 | else |
5b1c1493 | 2573 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2574 | get_page(page); |
e4a533a4 | 2575 | vmf->page = page; |
2576 | return 0; | |
9a2bb7f4 AK |
2577 | } |
2578 | ||
f0f37e2f | 2579 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2580 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2581 | }; |
2582 | ||
2583 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2584 | { | |
2585 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2586 | return 0; | |
2587 | } | |
2588 | ||
bccf2150 AK |
2589 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2590 | { | |
2591 | struct kvm_vcpu *vcpu = filp->private_data; | |
2592 | ||
45b5939e | 2593 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
66c0b394 | 2594 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2595 | return 0; |
2596 | } | |
2597 | ||
3d3aab1b | 2598 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2599 | .release = kvm_vcpu_release, |
2600 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 2601 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2602 | .llseek = noop_llseek, |
7ddfd3e0 | 2603 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
2604 | }; |
2605 | ||
2606 | /* | |
2607 | * Allocates an inode for the vcpu. | |
2608 | */ | |
2609 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2610 | { | |
e46b4692 MY |
2611 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
2612 | ||
2613 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
2614 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
2615 | } |
2616 | ||
3e7093d0 | 2617 | static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
45b5939e | 2618 | { |
741cbbae | 2619 | #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS |
45b5939e | 2620 | char dir_name[ITOA_MAX_LEN * 2]; |
45b5939e | 2621 | |
45b5939e | 2622 | if (!debugfs_initialized()) |
3e7093d0 | 2623 | return; |
45b5939e LC |
2624 | |
2625 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2626 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
3e7093d0 | 2627 | vcpu->kvm->debugfs_dentry); |
45b5939e | 2628 | |
3e7093d0 | 2629 | kvm_arch_create_vcpu_debugfs(vcpu); |
741cbbae | 2630 | #endif |
45b5939e LC |
2631 | } |
2632 | ||
c5ea7660 AK |
2633 | /* |
2634 | * Creates some virtual cpus. Good luck creating more than one. | |
2635 | */ | |
73880c80 | 2636 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
2637 | { |
2638 | int r; | |
e09fefde | 2639 | struct kvm_vcpu *vcpu; |
c5ea7660 | 2640 | |
0b1b1dfd | 2641 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
2642 | return -EINVAL; |
2643 | ||
6c7caebc PB |
2644 | mutex_lock(&kvm->lock); |
2645 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2646 | mutex_unlock(&kvm->lock); | |
2647 | return -EINVAL; | |
2648 | } | |
2649 | ||
2650 | kvm->created_vcpus++; | |
2651 | mutex_unlock(&kvm->lock); | |
2652 | ||
73880c80 | 2653 | vcpu = kvm_arch_vcpu_create(kvm, id); |
6c7caebc PB |
2654 | if (IS_ERR(vcpu)) { |
2655 | r = PTR_ERR(vcpu); | |
2656 | goto vcpu_decrement; | |
2657 | } | |
c5ea7660 | 2658 | |
15ad7146 AK |
2659 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
2660 | ||
26e5215f AK |
2661 | r = kvm_arch_vcpu_setup(vcpu); |
2662 | if (r) | |
d780592b | 2663 | goto vcpu_destroy; |
26e5215f | 2664 | |
3e7093d0 | 2665 | kvm_create_vcpu_debugfs(vcpu); |
45b5939e | 2666 | |
11ec2804 | 2667 | mutex_lock(&kvm->lock); |
e09fefde DH |
2668 | if (kvm_get_vcpu_by_id(kvm, id)) { |
2669 | r = -EEXIST; | |
2670 | goto unlock_vcpu_destroy; | |
2671 | } | |
73880c80 GN |
2672 | |
2673 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 2674 | |
fb3f0f51 | 2675 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 2676 | kvm_get_kvm(kvm); |
bccf2150 | 2677 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
2678 | if (r < 0) { |
2679 | kvm_put_kvm(kvm); | |
d780592b | 2680 | goto unlock_vcpu_destroy; |
73880c80 GN |
2681 | } |
2682 | ||
2683 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
dd489240 PB |
2684 | |
2685 | /* | |
2686 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2687 | * before kvm->online_vcpu's incremented value. | |
2688 | */ | |
73880c80 GN |
2689 | smp_wmb(); |
2690 | atomic_inc(&kvm->online_vcpus); | |
2691 | ||
73880c80 | 2692 | mutex_unlock(&kvm->lock); |
42897d86 | 2693 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2694 | return r; |
39c3b86e | 2695 | |
d780592b | 2696 | unlock_vcpu_destroy: |
7d8fece6 | 2697 | mutex_unlock(&kvm->lock); |
45b5939e | 2698 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
d780592b | 2699 | vcpu_destroy: |
d40ccc62 | 2700 | kvm_arch_vcpu_destroy(vcpu); |
6c7caebc PB |
2701 | vcpu_decrement: |
2702 | mutex_lock(&kvm->lock); | |
2703 | kvm->created_vcpus--; | |
2704 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
2705 | return r; |
2706 | } | |
2707 | ||
1961d276 AK |
2708 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2709 | { | |
2710 | if (sigset) { | |
2711 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2712 | vcpu->sigset_active = 1; | |
2713 | vcpu->sigset = *sigset; | |
2714 | } else | |
2715 | vcpu->sigset_active = 0; | |
2716 | return 0; | |
2717 | } | |
2718 | ||
bccf2150 AK |
2719 | static long kvm_vcpu_ioctl(struct file *filp, |
2720 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2721 | { |
bccf2150 | 2722 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2723 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2724 | int r; |
fa3795a7 DH |
2725 | struct kvm_fpu *fpu = NULL; |
2726 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2727 | |
6d4e4c4f AK |
2728 | if (vcpu->kvm->mm != current->mm) |
2729 | return -EIO; | |
2122ff5e | 2730 | |
2ea75be3 DM |
2731 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2732 | return -EINVAL; | |
2733 | ||
2122ff5e | 2734 | /* |
5cb0944c PB |
2735 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
2736 | * execution; mutex_lock() would break them. | |
2122ff5e | 2737 | */ |
5cb0944c PB |
2738 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
2739 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 2740 | return r; |
2122ff5e | 2741 | |
ec7660cc CD |
2742 | if (mutex_lock_killable(&vcpu->mutex)) |
2743 | return -EINTR; | |
6aa8b732 | 2744 | switch (ioctl) { |
0e4524a5 CB |
2745 | case KVM_RUN: { |
2746 | struct pid *oldpid; | |
f0fe5108 AK |
2747 | r = -EINVAL; |
2748 | if (arg) | |
2749 | goto out; | |
0e4524a5 | 2750 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 2751 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 2752 | /* The thread running this VCPU changed. */ |
bd2a6394 | 2753 | struct pid *newpid; |
f95ef0cd | 2754 | |
bd2a6394 CD |
2755 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
2756 | if (r) | |
2757 | break; | |
2758 | ||
2759 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
2760 | rcu_assign_pointer(vcpu->pid, newpid); |
2761 | if (oldpid) | |
2762 | synchronize_rcu(); | |
2763 | put_pid(oldpid); | |
2764 | } | |
b6c7a5dc | 2765 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2766 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2767 | break; |
0e4524a5 | 2768 | } |
6aa8b732 | 2769 | case KVM_GET_REGS: { |
3e4bb3ac | 2770 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2771 | |
3e4bb3ac | 2772 | r = -ENOMEM; |
b12ce36a | 2773 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT); |
3e4bb3ac | 2774 | if (!kvm_regs) |
6aa8b732 | 2775 | goto out; |
3e4bb3ac XZ |
2776 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2777 | if (r) | |
2778 | goto out_free1; | |
6aa8b732 | 2779 | r = -EFAULT; |
3e4bb3ac XZ |
2780 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2781 | goto out_free1; | |
6aa8b732 | 2782 | r = 0; |
3e4bb3ac XZ |
2783 | out_free1: |
2784 | kfree(kvm_regs); | |
6aa8b732 AK |
2785 | break; |
2786 | } | |
2787 | case KVM_SET_REGS: { | |
3e4bb3ac | 2788 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2789 | |
3e4bb3ac | 2790 | r = -ENOMEM; |
ff5c2c03 SL |
2791 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2792 | if (IS_ERR(kvm_regs)) { | |
2793 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2794 | goto out; |
ff5c2c03 | 2795 | } |
3e4bb3ac | 2796 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2797 | kfree(kvm_regs); |
6aa8b732 AK |
2798 | break; |
2799 | } | |
2800 | case KVM_GET_SREGS: { | |
b12ce36a BG |
2801 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), |
2802 | GFP_KERNEL_ACCOUNT); | |
fa3795a7 DH |
2803 | r = -ENOMEM; |
2804 | if (!kvm_sregs) | |
2805 | goto out; | |
2806 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2807 | if (r) |
2808 | goto out; | |
2809 | r = -EFAULT; | |
fa3795a7 | 2810 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2811 | goto out; |
2812 | r = 0; | |
2813 | break; | |
2814 | } | |
2815 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2816 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2817 | if (IS_ERR(kvm_sregs)) { | |
2818 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2819 | kvm_sregs = NULL; |
6aa8b732 | 2820 | goto out; |
ff5c2c03 | 2821 | } |
fa3795a7 | 2822 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2823 | break; |
2824 | } | |
62d9f0db MT |
2825 | case KVM_GET_MP_STATE: { |
2826 | struct kvm_mp_state mp_state; | |
2827 | ||
2828 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2829 | if (r) | |
2830 | goto out; | |
2831 | r = -EFAULT; | |
893bdbf1 | 2832 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
2833 | goto out; |
2834 | r = 0; | |
2835 | break; | |
2836 | } | |
2837 | case KVM_SET_MP_STATE: { | |
2838 | struct kvm_mp_state mp_state; | |
2839 | ||
2840 | r = -EFAULT; | |
893bdbf1 | 2841 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
2842 | goto out; |
2843 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2844 | break; |
2845 | } | |
6aa8b732 AK |
2846 | case KVM_TRANSLATE: { |
2847 | struct kvm_translation tr; | |
2848 | ||
2849 | r = -EFAULT; | |
893bdbf1 | 2850 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 2851 | goto out; |
8b006791 | 2852 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2853 | if (r) |
2854 | goto out; | |
2855 | r = -EFAULT; | |
893bdbf1 | 2856 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
2857 | goto out; |
2858 | r = 0; | |
2859 | break; | |
2860 | } | |
d0bfb940 JK |
2861 | case KVM_SET_GUEST_DEBUG: { |
2862 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2863 | |
2864 | r = -EFAULT; | |
893bdbf1 | 2865 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 2866 | goto out; |
d0bfb940 | 2867 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2868 | break; |
2869 | } | |
1961d276 AK |
2870 | case KVM_SET_SIGNAL_MASK: { |
2871 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2872 | struct kvm_signal_mask kvm_sigmask; | |
2873 | sigset_t sigset, *p; | |
2874 | ||
2875 | p = NULL; | |
2876 | if (argp) { | |
2877 | r = -EFAULT; | |
2878 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2879 | sizeof(kvm_sigmask))) |
1961d276 AK |
2880 | goto out; |
2881 | r = -EINVAL; | |
893bdbf1 | 2882 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
2883 | goto out; |
2884 | r = -EFAULT; | |
2885 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 2886 | sizeof(sigset))) |
1961d276 AK |
2887 | goto out; |
2888 | p = &sigset; | |
2889 | } | |
376d41ff | 2890 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2891 | break; |
2892 | } | |
b8836737 | 2893 | case KVM_GET_FPU: { |
b12ce36a | 2894 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT); |
fa3795a7 DH |
2895 | r = -ENOMEM; |
2896 | if (!fpu) | |
2897 | goto out; | |
2898 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2899 | if (r) |
2900 | goto out; | |
2901 | r = -EFAULT; | |
fa3795a7 | 2902 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2903 | goto out; |
2904 | r = 0; | |
2905 | break; | |
2906 | } | |
2907 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2908 | fpu = memdup_user(argp, sizeof(*fpu)); |
2909 | if (IS_ERR(fpu)) { | |
2910 | r = PTR_ERR(fpu); | |
18595411 | 2911 | fpu = NULL; |
b8836737 | 2912 | goto out; |
ff5c2c03 | 2913 | } |
fa3795a7 | 2914 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2915 | break; |
2916 | } | |
bccf2150 | 2917 | default: |
313a3dc7 | 2918 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2919 | } |
2920 | out: | |
ec7660cc | 2921 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
2922 | kfree(fpu); |
2923 | kfree(kvm_sregs); | |
bccf2150 AK |
2924 | return r; |
2925 | } | |
2926 | ||
de8e5d74 | 2927 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
2928 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
2929 | unsigned int ioctl, unsigned long arg) | |
2930 | { | |
2931 | struct kvm_vcpu *vcpu = filp->private_data; | |
2932 | void __user *argp = compat_ptr(arg); | |
2933 | int r; | |
2934 | ||
2935 | if (vcpu->kvm->mm != current->mm) | |
2936 | return -EIO; | |
2937 | ||
2938 | switch (ioctl) { | |
2939 | case KVM_SET_SIGNAL_MASK: { | |
2940 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2941 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
2942 | sigset_t sigset; |
2943 | ||
2944 | if (argp) { | |
2945 | r = -EFAULT; | |
2946 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2947 | sizeof(kvm_sigmask))) |
1dda606c AG |
2948 | goto out; |
2949 | r = -EINVAL; | |
3968cf62 | 2950 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
2951 | goto out; |
2952 | r = -EFAULT; | |
3968cf62 | 2953 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) |
1dda606c | 2954 | goto out; |
760a9a30 AC |
2955 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
2956 | } else | |
2957 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2958 | break; |
2959 | } | |
2960 | default: | |
2961 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2962 | } | |
2963 | ||
2964 | out: | |
2965 | return r; | |
2966 | } | |
2967 | #endif | |
2968 | ||
a1cd3f08 CLG |
2969 | static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma) |
2970 | { | |
2971 | struct kvm_device *dev = filp->private_data; | |
2972 | ||
2973 | if (dev->ops->mmap) | |
2974 | return dev->ops->mmap(dev, vma); | |
2975 | ||
2976 | return -ENODEV; | |
2977 | } | |
2978 | ||
852b6d57 SW |
2979 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
2980 | int (*accessor)(struct kvm_device *dev, | |
2981 | struct kvm_device_attr *attr), | |
2982 | unsigned long arg) | |
2983 | { | |
2984 | struct kvm_device_attr attr; | |
2985 | ||
2986 | if (!accessor) | |
2987 | return -EPERM; | |
2988 | ||
2989 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2990 | return -EFAULT; | |
2991 | ||
2992 | return accessor(dev, &attr); | |
2993 | } | |
2994 | ||
2995 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2996 | unsigned long arg) | |
2997 | { | |
2998 | struct kvm_device *dev = filp->private_data; | |
2999 | ||
ddba9180 SC |
3000 | if (dev->kvm->mm != current->mm) |
3001 | return -EIO; | |
3002 | ||
852b6d57 SW |
3003 | switch (ioctl) { |
3004 | case KVM_SET_DEVICE_ATTR: | |
3005 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
3006 | case KVM_GET_DEVICE_ATTR: | |
3007 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
3008 | case KVM_HAS_DEVICE_ATTR: | |
3009 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
3010 | default: | |
3011 | if (dev->ops->ioctl) | |
3012 | return dev->ops->ioctl(dev, ioctl, arg); | |
3013 | ||
3014 | return -ENOTTY; | |
3015 | } | |
3016 | } | |
3017 | ||
852b6d57 SW |
3018 | static int kvm_device_release(struct inode *inode, struct file *filp) |
3019 | { | |
3020 | struct kvm_device *dev = filp->private_data; | |
3021 | struct kvm *kvm = dev->kvm; | |
3022 | ||
2bde9b3e CLG |
3023 | if (dev->ops->release) { |
3024 | mutex_lock(&kvm->lock); | |
3025 | list_del(&dev->vm_node); | |
3026 | dev->ops->release(dev); | |
3027 | mutex_unlock(&kvm->lock); | |
3028 | } | |
3029 | ||
852b6d57 SW |
3030 | kvm_put_kvm(kvm); |
3031 | return 0; | |
3032 | } | |
3033 | ||
3034 | static const struct file_operations kvm_device_fops = { | |
3035 | .unlocked_ioctl = kvm_device_ioctl, | |
3036 | .release = kvm_device_release, | |
7ddfd3e0 | 3037 | KVM_COMPAT(kvm_device_ioctl), |
a1cd3f08 | 3038 | .mmap = kvm_device_mmap, |
852b6d57 SW |
3039 | }; |
3040 | ||
3041 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
3042 | { | |
3043 | if (filp->f_op != &kvm_device_fops) | |
3044 | return NULL; | |
3045 | ||
3046 | return filp->private_data; | |
3047 | } | |
3048 | ||
d60eacb0 | 3049 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 3050 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
3051 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
3052 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 3053 | #endif |
d60eacb0 WD |
3054 | }; |
3055 | ||
3056 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
3057 | { | |
3058 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
3059 | return -ENOSPC; | |
3060 | ||
3061 | if (kvm_device_ops_table[type] != NULL) | |
3062 | return -EEXIST; | |
3063 | ||
3064 | kvm_device_ops_table[type] = ops; | |
3065 | return 0; | |
3066 | } | |
3067 | ||
571ee1b6 WL |
3068 | void kvm_unregister_device_ops(u32 type) |
3069 | { | |
3070 | if (kvm_device_ops_table[type] != NULL) | |
3071 | kvm_device_ops_table[type] = NULL; | |
3072 | } | |
3073 | ||
852b6d57 SW |
3074 | static int kvm_ioctl_create_device(struct kvm *kvm, |
3075 | struct kvm_create_device *cd) | |
3076 | { | |
3077 | struct kvm_device_ops *ops = NULL; | |
3078 | struct kvm_device *dev; | |
3079 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
1d487e9b | 3080 | int type; |
852b6d57 SW |
3081 | int ret; |
3082 | ||
d60eacb0 WD |
3083 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
3084 | return -ENODEV; | |
3085 | ||
1d487e9b PB |
3086 | type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table)); |
3087 | ops = kvm_device_ops_table[type]; | |
d60eacb0 | 3088 | if (ops == NULL) |
852b6d57 | 3089 | return -ENODEV; |
852b6d57 SW |
3090 | |
3091 | if (test) | |
3092 | return 0; | |
3093 | ||
b12ce36a | 3094 | dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT); |
852b6d57 SW |
3095 | if (!dev) |
3096 | return -ENOMEM; | |
3097 | ||
3098 | dev->ops = ops; | |
3099 | dev->kvm = kvm; | |
852b6d57 | 3100 | |
a28ebea2 | 3101 | mutex_lock(&kvm->lock); |
1d487e9b | 3102 | ret = ops->create(dev, type); |
852b6d57 | 3103 | if (ret < 0) { |
a28ebea2 | 3104 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
3105 | kfree(dev); |
3106 | return ret; | |
3107 | } | |
a28ebea2 CD |
3108 | list_add(&dev->vm_node, &kvm->devices); |
3109 | mutex_unlock(&kvm->lock); | |
852b6d57 | 3110 | |
023e9fdd CD |
3111 | if (ops->init) |
3112 | ops->init(dev); | |
3113 | ||
cfa39381 | 3114 | kvm_get_kvm(kvm); |
24009b05 | 3115 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 3116 | if (ret < 0) { |
cfa39381 | 3117 | kvm_put_kvm(kvm); |
a28ebea2 CD |
3118 | mutex_lock(&kvm->lock); |
3119 | list_del(&dev->vm_node); | |
3120 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 3121 | ops->destroy(dev); |
852b6d57 SW |
3122 | return ret; |
3123 | } | |
3124 | ||
852b6d57 SW |
3125 | cd->fd = ret; |
3126 | return 0; | |
3127 | } | |
3128 | ||
92b591a4 AG |
3129 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
3130 | { | |
3131 | switch (arg) { | |
3132 | case KVM_CAP_USER_MEMORY: | |
3133 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
3134 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
3135 | case KVM_CAP_INTERNAL_ERROR_DATA: |
3136 | #ifdef CONFIG_HAVE_KVM_MSI | |
3137 | case KVM_CAP_SIGNAL_MSI: | |
3138 | #endif | |
297e2105 | 3139 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 3140 | case KVM_CAP_IRQFD: |
92b591a4 AG |
3141 | case KVM_CAP_IRQFD_RESAMPLE: |
3142 | #endif | |
e9ea5069 | 3143 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 | 3144 | case KVM_CAP_CHECK_EXTENSION_VM: |
e5d83c74 | 3145 | case KVM_CAP_ENABLE_CAP_VM: |
2a31b9db | 3146 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
d7547c55 | 3147 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: |
2a31b9db | 3148 | #endif |
92b591a4 | 3149 | return 1; |
4b4357e0 | 3150 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
3151 | case KVM_CAP_COALESCED_MMIO: |
3152 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
3153 | case KVM_CAP_COALESCED_PIO: |
3154 | return 1; | |
30422558 | 3155 | #endif |
92b591a4 AG |
3156 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3157 | case KVM_CAP_IRQ_ROUTING: | |
3158 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
3159 | #endif |
3160 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
3161 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
3162 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 3163 | #endif |
c110ae57 PB |
3164 | case KVM_CAP_NR_MEMSLOTS: |
3165 | return KVM_USER_MEM_SLOTS; | |
92b591a4 AG |
3166 | default: |
3167 | break; | |
3168 | } | |
3169 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
3170 | } | |
3171 | ||
e5d83c74 PB |
3172 | int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, |
3173 | struct kvm_enable_cap *cap) | |
3174 | { | |
3175 | return -EINVAL; | |
3176 | } | |
3177 | ||
3178 | static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, | |
3179 | struct kvm_enable_cap *cap) | |
3180 | { | |
3181 | switch (cap->cap) { | |
2a31b9db | 3182 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
d7547c55 | 3183 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: |
2a31b9db PB |
3184 | if (cap->flags || (cap->args[0] & ~1)) |
3185 | return -EINVAL; | |
3186 | kvm->manual_dirty_log_protect = cap->args[0]; | |
3187 | return 0; | |
3188 | #endif | |
e5d83c74 PB |
3189 | default: |
3190 | return kvm_vm_ioctl_enable_cap(kvm, cap); | |
3191 | } | |
3192 | } | |
3193 | ||
bccf2150 AK |
3194 | static long kvm_vm_ioctl(struct file *filp, |
3195 | unsigned int ioctl, unsigned long arg) | |
3196 | { | |
3197 | struct kvm *kvm = filp->private_data; | |
3198 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 3199 | int r; |
bccf2150 | 3200 | |
6d4e4c4f AK |
3201 | if (kvm->mm != current->mm) |
3202 | return -EIO; | |
bccf2150 AK |
3203 | switch (ioctl) { |
3204 | case KVM_CREATE_VCPU: | |
3205 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 3206 | break; |
e5d83c74 PB |
3207 | case KVM_ENABLE_CAP: { |
3208 | struct kvm_enable_cap cap; | |
3209 | ||
3210 | r = -EFAULT; | |
3211 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
3212 | goto out; | |
3213 | r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap); | |
3214 | break; | |
3215 | } | |
6fc138d2 IE |
3216 | case KVM_SET_USER_MEMORY_REGION: { |
3217 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3218 | ||
3219 | r = -EFAULT; | |
3220 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 3221 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
3222 | goto out; |
3223 | ||
47ae31e2 | 3224 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
3225 | break; |
3226 | } | |
3227 | case KVM_GET_DIRTY_LOG: { | |
3228 | struct kvm_dirty_log log; | |
3229 | ||
3230 | r = -EFAULT; | |
893bdbf1 | 3231 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 3232 | goto out; |
2c6f5df9 | 3233 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
3234 | break; |
3235 | } | |
2a31b9db PB |
3236 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3237 | case KVM_CLEAR_DIRTY_LOG: { | |
3238 | struct kvm_clear_dirty_log log; | |
3239 | ||
3240 | r = -EFAULT; | |
3241 | if (copy_from_user(&log, argp, sizeof(log))) | |
3242 | goto out; | |
3243 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
3244 | break; | |
3245 | } | |
3246 | #endif | |
4b4357e0 | 3247 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3248 | case KVM_REGISTER_COALESCED_MMIO: { |
3249 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3250 | |
5f94c174 | 3251 | r = -EFAULT; |
893bdbf1 | 3252 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3253 | goto out; |
5f94c174 | 3254 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3255 | break; |
3256 | } | |
3257 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3258 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3259 | |
5f94c174 | 3260 | r = -EFAULT; |
893bdbf1 | 3261 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3262 | goto out; |
5f94c174 | 3263 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3264 | break; |
3265 | } | |
3266 | #endif | |
721eecbf GH |
3267 | case KVM_IRQFD: { |
3268 | struct kvm_irqfd data; | |
3269 | ||
3270 | r = -EFAULT; | |
893bdbf1 | 3271 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 3272 | goto out; |
d4db2935 | 3273 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
3274 | break; |
3275 | } | |
d34e6b17 GH |
3276 | case KVM_IOEVENTFD: { |
3277 | struct kvm_ioeventfd data; | |
3278 | ||
3279 | r = -EFAULT; | |
893bdbf1 | 3280 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
3281 | goto out; |
3282 | r = kvm_ioeventfd(kvm, &data); | |
3283 | break; | |
3284 | } | |
07975ad3 JK |
3285 | #ifdef CONFIG_HAVE_KVM_MSI |
3286 | case KVM_SIGNAL_MSI: { | |
3287 | struct kvm_msi msi; | |
3288 | ||
3289 | r = -EFAULT; | |
893bdbf1 | 3290 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
3291 | goto out; |
3292 | r = kvm_send_userspace_msi(kvm, &msi); | |
3293 | break; | |
3294 | } | |
23d43cf9 CD |
3295 | #endif |
3296 | #ifdef __KVM_HAVE_IRQ_LINE | |
3297 | case KVM_IRQ_LINE_STATUS: | |
3298 | case KVM_IRQ_LINE: { | |
3299 | struct kvm_irq_level irq_event; | |
3300 | ||
3301 | r = -EFAULT; | |
893bdbf1 | 3302 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
3303 | goto out; |
3304 | ||
aa2fbe6d YZ |
3305 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
3306 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
3307 | if (r) |
3308 | goto out; | |
3309 | ||
3310 | r = -EFAULT; | |
3311 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 3312 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
3313 | goto out; |
3314 | } | |
3315 | ||
3316 | r = 0; | |
3317 | break; | |
3318 | } | |
73880c80 | 3319 | #endif |
aa8d5944 AG |
3320 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3321 | case KVM_SET_GSI_ROUTING: { | |
3322 | struct kvm_irq_routing routing; | |
3323 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 3324 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
3325 | |
3326 | r = -EFAULT; | |
3327 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3328 | goto out; | |
3329 | r = -EINVAL; | |
5c0aea0e DH |
3330 | if (!kvm_arch_can_set_irq_routing(kvm)) |
3331 | goto out; | |
caf1ff26 | 3332 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
3333 | goto out; |
3334 | if (routing.flags) | |
3335 | goto out; | |
f8c1b85b PB |
3336 | if (routing.nr) { |
3337 | r = -ENOMEM; | |
42bc47b3 KC |
3338 | entries = vmalloc(array_size(sizeof(*entries), |
3339 | routing.nr)); | |
f8c1b85b PB |
3340 | if (!entries) |
3341 | goto out; | |
3342 | r = -EFAULT; | |
3343 | urouting = argp; | |
3344 | if (copy_from_user(entries, urouting->entries, | |
3345 | routing.nr * sizeof(*entries))) | |
3346 | goto out_free_irq_routing; | |
3347 | } | |
aa8d5944 AG |
3348 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
3349 | routing.flags); | |
a642a175 | 3350 | out_free_irq_routing: |
aa8d5944 AG |
3351 | vfree(entries); |
3352 | break; | |
3353 | } | |
3354 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
3355 | case KVM_CREATE_DEVICE: { |
3356 | struct kvm_create_device cd; | |
3357 | ||
3358 | r = -EFAULT; | |
3359 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3360 | goto out; | |
3361 | ||
3362 | r = kvm_ioctl_create_device(kvm, &cd); | |
3363 | if (r) | |
3364 | goto out; | |
3365 | ||
3366 | r = -EFAULT; | |
3367 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3368 | goto out; | |
3369 | ||
3370 | r = 0; | |
3371 | break; | |
3372 | } | |
92b591a4 AG |
3373 | case KVM_CHECK_EXTENSION: |
3374 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3375 | break; | |
f17abe9a | 3376 | default: |
1fe779f8 | 3377 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
3378 | } |
3379 | out: | |
3380 | return r; | |
3381 | } | |
3382 | ||
de8e5d74 | 3383 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
3384 | struct compat_kvm_dirty_log { |
3385 | __u32 slot; | |
3386 | __u32 padding1; | |
3387 | union { | |
3388 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3389 | __u64 padding2; | |
3390 | }; | |
3391 | }; | |
3392 | ||
3393 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3394 | unsigned int ioctl, unsigned long arg) | |
3395 | { | |
3396 | struct kvm *kvm = filp->private_data; | |
3397 | int r; | |
3398 | ||
3399 | if (kvm->mm != current->mm) | |
3400 | return -EIO; | |
3401 | switch (ioctl) { | |
3402 | case KVM_GET_DIRTY_LOG: { | |
3403 | struct compat_kvm_dirty_log compat_log; | |
3404 | struct kvm_dirty_log log; | |
3405 | ||
6ff5894c AB |
3406 | if (copy_from_user(&compat_log, (void __user *)arg, |
3407 | sizeof(compat_log))) | |
f6a3b168 | 3408 | return -EFAULT; |
6ff5894c AB |
3409 | log.slot = compat_log.slot; |
3410 | log.padding1 = compat_log.padding1; | |
3411 | log.padding2 = compat_log.padding2; | |
3412 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3413 | ||
3414 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
3415 | break; |
3416 | } | |
3417 | default: | |
3418 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3419 | } | |
6ff5894c AB |
3420 | return r; |
3421 | } | |
3422 | #endif | |
3423 | ||
3d3aab1b | 3424 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
3425 | .release = kvm_vm_release, |
3426 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 3427 | .llseek = noop_llseek, |
7ddfd3e0 | 3428 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
3429 | }; |
3430 | ||
e08b9637 | 3431 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 3432 | { |
aac87636 | 3433 | int r; |
f17abe9a | 3434 | struct kvm *kvm; |
506cfba9 | 3435 | struct file *file; |
f17abe9a | 3436 | |
e08b9637 | 3437 | kvm = kvm_create_vm(type); |
d6d28168 AK |
3438 | if (IS_ERR(kvm)) |
3439 | return PTR_ERR(kvm); | |
4b4357e0 | 3440 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 3441 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
3442 | if (r < 0) |
3443 | goto put_kvm; | |
6ce5a090 | 3444 | #endif |
506cfba9 | 3445 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
3446 | if (r < 0) |
3447 | goto put_kvm; | |
3448 | ||
506cfba9 AV |
3449 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
3450 | if (IS_ERR(file)) { | |
3451 | put_unused_fd(r); | |
78588335 ME |
3452 | r = PTR_ERR(file); |
3453 | goto put_kvm; | |
506cfba9 | 3454 | } |
536a6f88 | 3455 | |
525df861 PB |
3456 | /* |
3457 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3458 | * already set, with ->release() being kvm_vm_release(). In error | |
3459 | * cases it will be called by the final fput(file) and will take | |
3460 | * care of doing kvm_put_kvm(kvm). | |
3461 | */ | |
536a6f88 | 3462 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
3463 | put_unused_fd(r); |
3464 | fput(file); | |
536a6f88 JF |
3465 | return -ENOMEM; |
3466 | } | |
286de8f6 | 3467 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 3468 | |
506cfba9 | 3469 | fd_install(r, file); |
aac87636 | 3470 | return r; |
78588335 ME |
3471 | |
3472 | put_kvm: | |
3473 | kvm_put_kvm(kvm); | |
3474 | return r; | |
f17abe9a AK |
3475 | } |
3476 | ||
3477 | static long kvm_dev_ioctl(struct file *filp, | |
3478 | unsigned int ioctl, unsigned long arg) | |
3479 | { | |
07c45a36 | 3480 | long r = -EINVAL; |
f17abe9a AK |
3481 | |
3482 | switch (ioctl) { | |
3483 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
3484 | if (arg) |
3485 | goto out; | |
f17abe9a AK |
3486 | r = KVM_API_VERSION; |
3487 | break; | |
3488 | case KVM_CREATE_VM: | |
e08b9637 | 3489 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 3490 | break; |
018d00d2 | 3491 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 3492 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 3493 | break; |
07c45a36 | 3494 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
3495 | if (arg) |
3496 | goto out; | |
adb1ff46 AK |
3497 | r = PAGE_SIZE; /* struct kvm_run */ |
3498 | #ifdef CONFIG_X86 | |
3499 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 3500 | #endif |
4b4357e0 | 3501 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 3502 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 3503 | #endif |
07c45a36 | 3504 | break; |
d4c9ff2d FEL |
3505 | case KVM_TRACE_ENABLE: |
3506 | case KVM_TRACE_PAUSE: | |
3507 | case KVM_TRACE_DISABLE: | |
2023a29c | 3508 | r = -EOPNOTSUPP; |
d4c9ff2d | 3509 | break; |
6aa8b732 | 3510 | default: |
043405e1 | 3511 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3512 | } |
3513 | out: | |
3514 | return r; | |
3515 | } | |
3516 | ||
6aa8b732 | 3517 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 3518 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 3519 | .llseek = noop_llseek, |
7ddfd3e0 | 3520 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
3521 | }; |
3522 | ||
3523 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3524 | KVM_MINOR, |
6aa8b732 AK |
3525 | "kvm", |
3526 | &kvm_chardev_ops, | |
3527 | }; | |
3528 | ||
75b7127c | 3529 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3530 | { |
3531 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3532 | int r; |
1b6c0168 | 3533 | |
7f59f492 | 3534 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3535 | return; |
10474ae8 | 3536 | |
7f59f492 | 3537 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3538 | |
13a34e06 | 3539 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3540 | |
3541 | if (r) { | |
3542 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3543 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3544 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3545 | } |
1b6c0168 AK |
3546 | } |
3547 | ||
8c18b2d2 | 3548 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 3549 | { |
4a937f96 | 3550 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3551 | if (kvm_usage_count) |
3552 | hardware_enable_nolock(NULL); | |
4a937f96 | 3553 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3554 | return 0; |
75b7127c TY |
3555 | } |
3556 | ||
3557 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3558 | { |
3559 | int cpu = raw_smp_processor_id(); | |
3560 | ||
7f59f492 | 3561 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3562 | return; |
7f59f492 | 3563 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3564 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3565 | } |
3566 | ||
8c18b2d2 | 3567 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 3568 | { |
4a937f96 | 3569 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3570 | if (kvm_usage_count) |
3571 | hardware_disable_nolock(NULL); | |
4a937f96 | 3572 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3573 | return 0; |
75b7127c TY |
3574 | } |
3575 | ||
10474ae8 AG |
3576 | static void hardware_disable_all_nolock(void) |
3577 | { | |
3578 | BUG_ON(!kvm_usage_count); | |
3579 | ||
3580 | kvm_usage_count--; | |
3581 | if (!kvm_usage_count) | |
75b7127c | 3582 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3583 | } |
3584 | ||
3585 | static void hardware_disable_all(void) | |
3586 | { | |
4a937f96 | 3587 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3588 | hardware_disable_all_nolock(); |
4a937f96 | 3589 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3590 | } |
3591 | ||
3592 | static int hardware_enable_all(void) | |
3593 | { | |
3594 | int r = 0; | |
3595 | ||
4a937f96 | 3596 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3597 | |
3598 | kvm_usage_count++; | |
3599 | if (kvm_usage_count == 1) { | |
3600 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3601 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3602 | |
3603 | if (atomic_read(&hardware_enable_failed)) { | |
3604 | hardware_disable_all_nolock(); | |
3605 | r = -EBUSY; | |
3606 | } | |
3607 | } | |
3608 | ||
4a937f96 | 3609 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3610 | |
3611 | return r; | |
3612 | } | |
3613 | ||
9a2b85c6 | 3614 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 3615 | void *v) |
9a2b85c6 | 3616 | { |
8e1c1815 SY |
3617 | /* |
3618 | * Some (well, at least mine) BIOSes hang on reboot if | |
3619 | * in vmx root mode. | |
3620 | * | |
3621 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3622 | */ | |
1170adc6 | 3623 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 3624 | kvm_rebooting = true; |
75b7127c | 3625 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
3626 | return NOTIFY_OK; |
3627 | } | |
3628 | ||
3629 | static struct notifier_block kvm_reboot_notifier = { | |
3630 | .notifier_call = kvm_reboot, | |
3631 | .priority = 0, | |
3632 | }; | |
3633 | ||
e93f8a0f | 3634 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
3635 | { |
3636 | int i; | |
3637 | ||
3638 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 3639 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
3640 | |
3641 | kvm_iodevice_destructor(pos); | |
3642 | } | |
e93f8a0f | 3643 | kfree(bus); |
2eeb2e94 GH |
3644 | } |
3645 | ||
c21fbff1 | 3646 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 3647 | const struct kvm_io_range *r2) |
743eeb0b | 3648 | { |
8f4216c7 JW |
3649 | gpa_t addr1 = r1->addr; |
3650 | gpa_t addr2 = r2->addr; | |
3651 | ||
3652 | if (addr1 < addr2) | |
743eeb0b | 3653 | return -1; |
8f4216c7 JW |
3654 | |
3655 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3656 | * accept any overlapping write. Any order is acceptable for | |
3657 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3658 | * we process all of them. | |
3659 | */ | |
3660 | if (r2->len) { | |
3661 | addr1 += r1->len; | |
3662 | addr2 += r2->len; | |
3663 | } | |
3664 | ||
3665 | if (addr1 > addr2) | |
743eeb0b | 3666 | return 1; |
8f4216c7 | 3667 | |
743eeb0b SL |
3668 | return 0; |
3669 | } | |
3670 | ||
a343c9b7 PB |
3671 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
3672 | { | |
c21fbff1 | 3673 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
3674 | } |
3675 | ||
39369f7a | 3676 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
3677 | gpa_t addr, int len) |
3678 | { | |
3679 | struct kvm_io_range *range, key; | |
3680 | int off; | |
3681 | ||
3682 | key = (struct kvm_io_range) { | |
3683 | .addr = addr, | |
3684 | .len = len, | |
3685 | }; | |
3686 | ||
3687 | range = bsearch(&key, bus->range, bus->dev_count, | |
3688 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3689 | if (range == NULL) | |
3690 | return -ENOENT; | |
3691 | ||
3692 | off = range - bus->range; | |
3693 | ||
c21fbff1 | 3694 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
3695 | off--; |
3696 | ||
3697 | return off; | |
3698 | } | |
3699 | ||
e32edf4f | 3700 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
3701 | struct kvm_io_range *range, const void *val) |
3702 | { | |
3703 | int idx; | |
3704 | ||
3705 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3706 | if (idx < 0) | |
3707 | return -EOPNOTSUPP; | |
3708 | ||
3709 | while (idx < bus->dev_count && | |
c21fbff1 | 3710 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3711 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3712 | range->len, val)) |
3713 | return idx; | |
3714 | idx++; | |
3715 | } | |
3716 | ||
3717 | return -EOPNOTSUPP; | |
3718 | } | |
3719 | ||
bda9020e | 3720 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 3721 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 3722 | int len, const void *val) |
2eeb2e94 | 3723 | { |
90d83dc3 | 3724 | struct kvm_io_bus *bus; |
743eeb0b | 3725 | struct kvm_io_range range; |
126a5af5 | 3726 | int r; |
743eeb0b SL |
3727 | |
3728 | range = (struct kvm_io_range) { | |
3729 | .addr = addr, | |
3730 | .len = len, | |
3731 | }; | |
90d83dc3 | 3732 | |
e32edf4f | 3733 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3734 | if (!bus) |
3735 | return -ENOMEM; | |
e32edf4f | 3736 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3737 | return r < 0 ? r : 0; |
3738 | } | |
a2420107 | 3739 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
126a5af5 CH |
3740 | |
3741 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
3742 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
3743 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
3744 | { |
3745 | struct kvm_io_bus *bus; | |
3746 | struct kvm_io_range range; | |
3747 | ||
3748 | range = (struct kvm_io_range) { | |
3749 | .addr = addr, | |
3750 | .len = len, | |
3751 | }; | |
3752 | ||
e32edf4f | 3753 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3754 | if (!bus) |
3755 | return -ENOMEM; | |
126a5af5 CH |
3756 | |
3757 | /* First try the device referenced by cookie. */ | |
3758 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 3759 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 3760 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
3761 | val)) |
3762 | return cookie; | |
3763 | ||
3764 | /* | |
3765 | * cookie contained garbage; fall back to search and return the | |
3766 | * correct cookie value. | |
3767 | */ | |
e32edf4f | 3768 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3769 | } |
3770 | ||
e32edf4f NN |
3771 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
3772 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
3773 | { |
3774 | int idx; | |
3775 | ||
3776 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
3777 | if (idx < 0) |
3778 | return -EOPNOTSUPP; | |
3779 | ||
3780 | while (idx < bus->dev_count && | |
c21fbff1 | 3781 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3782 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3783 | range->len, val)) |
3784 | return idx; | |
743eeb0b SL |
3785 | idx++; |
3786 | } | |
3787 | ||
bda9020e MT |
3788 | return -EOPNOTSUPP; |
3789 | } | |
2eeb2e94 | 3790 | |
bda9020e | 3791 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 3792 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 3793 | int len, void *val) |
bda9020e | 3794 | { |
90d83dc3 | 3795 | struct kvm_io_bus *bus; |
743eeb0b | 3796 | struct kvm_io_range range; |
126a5af5 | 3797 | int r; |
743eeb0b SL |
3798 | |
3799 | range = (struct kvm_io_range) { | |
3800 | .addr = addr, | |
3801 | .len = len, | |
3802 | }; | |
e93f8a0f | 3803 | |
e32edf4f | 3804 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3805 | if (!bus) |
3806 | return -ENOMEM; | |
e32edf4f | 3807 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
3808 | return r < 0 ? r : 0; |
3809 | } | |
743eeb0b | 3810 | |
79fac95e | 3811 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3812 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3813 | int len, struct kvm_io_device *dev) | |
6c474694 | 3814 | { |
d4c67a7a | 3815 | int i; |
e93f8a0f | 3816 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 3817 | struct kvm_io_range range; |
090b7aff | 3818 | |
4a12f951 | 3819 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
3820 | if (!bus) |
3821 | return -ENOMEM; | |
3822 | ||
6ea34c9b AK |
3823 | /* exclude ioeventfd which is limited by maximum fd */ |
3824 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3825 | return -ENOSPC; |
2eeb2e94 | 3826 | |
90952cd3 | 3827 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1), |
b12ce36a | 3828 | GFP_KERNEL_ACCOUNT); |
e93f8a0f MT |
3829 | if (!new_bus) |
3830 | return -ENOMEM; | |
d4c67a7a GH |
3831 | |
3832 | range = (struct kvm_io_range) { | |
3833 | .addr = addr, | |
3834 | .len = len, | |
3835 | .dev = dev, | |
3836 | }; | |
3837 | ||
3838 | for (i = 0; i < bus->dev_count; i++) | |
3839 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
3840 | break; | |
3841 | ||
3842 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3843 | new_bus->dev_count++; | |
3844 | new_bus->range[i] = range; | |
3845 | memcpy(new_bus->range + i + 1, bus->range + i, | |
3846 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3847 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3848 | synchronize_srcu_expedited(&kvm->srcu); | |
3849 | kfree(bus); | |
090b7aff GH |
3850 | |
3851 | return 0; | |
3852 | } | |
3853 | ||
79fac95e | 3854 | /* Caller must hold slots_lock. */ |
90db1043 DH |
3855 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3856 | struct kvm_io_device *dev) | |
090b7aff | 3857 | { |
90db1043 | 3858 | int i; |
e93f8a0f | 3859 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3860 | |
4a12f951 | 3861 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 3862 | if (!bus) |
90db1043 | 3863 | return; |
df630b8c | 3864 | |
a1300716 AK |
3865 | for (i = 0; i < bus->dev_count; i++) |
3866 | if (bus->range[i].dev == dev) { | |
090b7aff GH |
3867 | break; |
3868 | } | |
e93f8a0f | 3869 | |
90db1043 DH |
3870 | if (i == bus->dev_count) |
3871 | return; | |
a1300716 | 3872 | |
90952cd3 | 3873 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1), |
b12ce36a | 3874 | GFP_KERNEL_ACCOUNT); |
90db1043 DH |
3875 | if (!new_bus) { |
3876 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
3877 | goto broken; | |
3878 | } | |
a1300716 AK |
3879 | |
3880 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3881 | new_bus->dev_count--; | |
3882 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3883 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f | 3884 | |
90db1043 | 3885 | broken: |
e93f8a0f MT |
3886 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3887 | synchronize_srcu_expedited(&kvm->srcu); | |
3888 | kfree(bus); | |
90db1043 | 3889 | return; |
2eeb2e94 GH |
3890 | } |
3891 | ||
8a39d006 AP |
3892 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3893 | gpa_t addr) | |
3894 | { | |
3895 | struct kvm_io_bus *bus; | |
3896 | int dev_idx, srcu_idx; | |
3897 | struct kvm_io_device *iodev = NULL; | |
3898 | ||
3899 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3900 | ||
3901 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
3902 | if (!bus) |
3903 | goto out_unlock; | |
8a39d006 AP |
3904 | |
3905 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3906 | if (dev_idx < 0) | |
3907 | goto out_unlock; | |
3908 | ||
3909 | iodev = bus->range[dev_idx].dev; | |
3910 | ||
3911 | out_unlock: | |
3912 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3913 | ||
3914 | return iodev; | |
3915 | } | |
3916 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
3917 | ||
536a6f88 JF |
3918 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
3919 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
3920 | const char *fmt) | |
3921 | { | |
3922 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3923 | inode->i_private; | |
3924 | ||
3925 | /* The debugfs files are a reference to the kvm struct which | |
3926 | * is still valid when kvm_destroy_vm is called. | |
3927 | * To avoid the race between open and the removal of the debugfs | |
3928 | * directory we test against the users count. | |
3929 | */ | |
e3736c3e | 3930 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) |
536a6f88 JF |
3931 | return -ENOENT; |
3932 | ||
833b45de PB |
3933 | if (simple_attr_open(inode, file, get, |
3934 | stat_data->mode & S_IWUGO ? set : NULL, | |
3935 | fmt)) { | |
536a6f88 JF |
3936 | kvm_put_kvm(stat_data->kvm); |
3937 | return -ENOMEM; | |
3938 | } | |
3939 | ||
3940 | return 0; | |
3941 | } | |
3942 | ||
3943 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
3944 | { | |
3945 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3946 | inode->i_private; | |
3947 | ||
3948 | simple_attr_release(inode, file); | |
3949 | kvm_put_kvm(stat_data->kvm); | |
3950 | ||
3951 | return 0; | |
3952 | } | |
3953 | ||
3954 | static int vm_stat_get_per_vm(void *data, u64 *val) | |
3955 | { | |
3956 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3957 | ||
8a7e75d4 | 3958 | *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset); |
536a6f88 JF |
3959 | |
3960 | return 0; | |
3961 | } | |
3962 | ||
ce35ef27 SJS |
3963 | static int vm_stat_clear_per_vm(void *data, u64 val) |
3964 | { | |
3965 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3966 | ||
3967 | if (val) | |
3968 | return -EINVAL; | |
3969 | ||
3970 | *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0; | |
3971 | ||
3972 | return 0; | |
3973 | } | |
3974 | ||
536a6f88 JF |
3975 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) |
3976 | { | |
3977 | __simple_attr_check_format("%llu\n", 0ull); | |
3978 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, | |
ce35ef27 | 3979 | vm_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
3980 | } |
3981 | ||
3982 | static const struct file_operations vm_stat_get_per_vm_fops = { | |
3983 | .owner = THIS_MODULE, | |
3984 | .open = vm_stat_get_per_vm_open, | |
3985 | .release = kvm_debugfs_release, | |
3986 | .read = simple_attr_read, | |
3987 | .write = simple_attr_write, | |
3bed8888 | 3988 | .llseek = no_llseek, |
536a6f88 JF |
3989 | }; |
3990 | ||
3991 | static int vcpu_stat_get_per_vm(void *data, u64 *val) | |
3992 | { | |
3993 | int i; | |
3994 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3995 | struct kvm_vcpu *vcpu; | |
3996 | ||
3997 | *val = 0; | |
3998 | ||
3999 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
8a7e75d4 | 4000 | *val += *(u64 *)((void *)vcpu + stat_data->offset); |
536a6f88 JF |
4001 | |
4002 | return 0; | |
4003 | } | |
4004 | ||
ce35ef27 SJS |
4005 | static int vcpu_stat_clear_per_vm(void *data, u64 val) |
4006 | { | |
4007 | int i; | |
4008 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
4009 | struct kvm_vcpu *vcpu; | |
4010 | ||
4011 | if (val) | |
4012 | return -EINVAL; | |
4013 | ||
4014 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
4015 | *(u64 *)((void *)vcpu + stat_data->offset) = 0; | |
4016 | ||
4017 | return 0; | |
4018 | } | |
4019 | ||
536a6f88 JF |
4020 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) |
4021 | { | |
4022 | __simple_attr_check_format("%llu\n", 0ull); | |
4023 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, | |
ce35ef27 | 4024 | vcpu_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
4025 | } |
4026 | ||
4027 | static const struct file_operations vcpu_stat_get_per_vm_fops = { | |
4028 | .owner = THIS_MODULE, | |
4029 | .open = vcpu_stat_get_per_vm_open, | |
4030 | .release = kvm_debugfs_release, | |
4031 | .read = simple_attr_read, | |
4032 | .write = simple_attr_write, | |
3bed8888 | 4033 | .llseek = no_llseek, |
536a6f88 JF |
4034 | }; |
4035 | ||
4036 | static const struct file_operations *stat_fops_per_vm[] = { | |
4037 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, | |
4038 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, | |
4039 | }; | |
4040 | ||
8b88b099 | 4041 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
4042 | { |
4043 | unsigned offset = (long)_offset; | |
ba1389b7 | 4044 | struct kvm *kvm; |
536a6f88 JF |
4045 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
4046 | u64 tmp_val; | |
ba1389b7 | 4047 | |
8b88b099 | 4048 | *val = 0; |
0d9ce162 | 4049 | mutex_lock(&kvm_lock); |
536a6f88 JF |
4050 | list_for_each_entry(kvm, &vm_list, vm_list) { |
4051 | stat_tmp.kvm = kvm; | |
4052 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
4053 | *val += tmp_val; | |
4054 | } | |
0d9ce162 | 4055 | mutex_unlock(&kvm_lock); |
8b88b099 | 4056 | return 0; |
ba1389b7 AK |
4057 | } |
4058 | ||
ce35ef27 SJS |
4059 | static int vm_stat_clear(void *_offset, u64 val) |
4060 | { | |
4061 | unsigned offset = (long)_offset; | |
4062 | struct kvm *kvm; | |
4063 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
4064 | ||
4065 | if (val) | |
4066 | return -EINVAL; | |
4067 | ||
0d9ce162 | 4068 | mutex_lock(&kvm_lock); |
ce35ef27 SJS |
4069 | list_for_each_entry(kvm, &vm_list, vm_list) { |
4070 | stat_tmp.kvm = kvm; | |
4071 | vm_stat_clear_per_vm((void *)&stat_tmp, 0); | |
4072 | } | |
0d9ce162 | 4073 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4074 | |
4075 | return 0; | |
4076 | } | |
4077 | ||
4078 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
ba1389b7 | 4079 | |
8b88b099 | 4080 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
4081 | { |
4082 | unsigned offset = (long)_offset; | |
1165f5fe | 4083 | struct kvm *kvm; |
536a6f88 JF |
4084 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
4085 | u64 tmp_val; | |
1165f5fe | 4086 | |
8b88b099 | 4087 | *val = 0; |
0d9ce162 | 4088 | mutex_lock(&kvm_lock); |
536a6f88 JF |
4089 | list_for_each_entry(kvm, &vm_list, vm_list) { |
4090 | stat_tmp.kvm = kvm; | |
4091 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
4092 | *val += tmp_val; | |
4093 | } | |
0d9ce162 | 4094 | mutex_unlock(&kvm_lock); |
8b88b099 | 4095 | return 0; |
1165f5fe AK |
4096 | } |
4097 | ||
ce35ef27 SJS |
4098 | static int vcpu_stat_clear(void *_offset, u64 val) |
4099 | { | |
4100 | unsigned offset = (long)_offset; | |
4101 | struct kvm *kvm; | |
4102 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
4103 | ||
4104 | if (val) | |
4105 | return -EINVAL; | |
4106 | ||
0d9ce162 | 4107 | mutex_lock(&kvm_lock); |
ce35ef27 SJS |
4108 | list_for_each_entry(kvm, &vm_list, vm_list) { |
4109 | stat_tmp.kvm = kvm; | |
4110 | vcpu_stat_clear_per_vm((void *)&stat_tmp, 0); | |
4111 | } | |
0d9ce162 | 4112 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4113 | |
4114 | return 0; | |
4115 | } | |
4116 | ||
4117 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
4118 | "%llu\n"); | |
ba1389b7 | 4119 | |
828c0950 | 4120 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
4121 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
4122 | [KVM_STAT_VM] = &vm_stat_fops, | |
4123 | }; | |
1165f5fe | 4124 | |
286de8f6 CI |
4125 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
4126 | { | |
4127 | struct kobj_uevent_env *env; | |
286de8f6 CI |
4128 | unsigned long long created, active; |
4129 | ||
4130 | if (!kvm_dev.this_device || !kvm) | |
4131 | return; | |
4132 | ||
0d9ce162 | 4133 | mutex_lock(&kvm_lock); |
286de8f6 CI |
4134 | if (type == KVM_EVENT_CREATE_VM) { |
4135 | kvm_createvm_count++; | |
4136 | kvm_active_vms++; | |
4137 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
4138 | kvm_active_vms--; | |
4139 | } | |
4140 | created = kvm_createvm_count; | |
4141 | active = kvm_active_vms; | |
0d9ce162 | 4142 | mutex_unlock(&kvm_lock); |
286de8f6 | 4143 | |
b12ce36a | 4144 | env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT); |
286de8f6 CI |
4145 | if (!env) |
4146 | return; | |
4147 | ||
4148 | add_uevent_var(env, "CREATED=%llu", created); | |
4149 | add_uevent_var(env, "COUNT=%llu", active); | |
4150 | ||
fdeaf7e3 | 4151 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 4152 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
4153 | kvm->userspace_pid = task_pid_nr(current); |
4154 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 4155 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
4156 | } |
4157 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 | 4158 | |
8ed0579c | 4159 | if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) { |
b12ce36a | 4160 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); |
fdeaf7e3 CI |
4161 | |
4162 | if (p) { | |
4163 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
4164 | if (!IS_ERR(tmp)) | |
4165 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
4166 | kfree(p); | |
286de8f6 CI |
4167 | } |
4168 | } | |
4169 | /* no need for checks, since we are adding at most only 5 keys */ | |
4170 | env->envp[env->envp_idx++] = NULL; | |
4171 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
4172 | kfree(env); | |
286de8f6 CI |
4173 | } |
4174 | ||
929f45e3 | 4175 | static void kvm_init_debug(void) |
6aa8b732 AK |
4176 | { |
4177 | struct kvm_stats_debugfs_item *p; | |
4178 | ||
76f7c879 | 4179 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 4180 | |
536a6f88 JF |
4181 | kvm_debugfs_num_entries = 0; |
4182 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
833b45de PB |
4183 | int mode = p->mode ? p->mode : 0644; |
4184 | debugfs_create_file(p->name, mode, kvm_debugfs_dir, | |
929f45e3 GKH |
4185 | (void *)(long)p->offset, |
4186 | stat_fops[p->kind]); | |
4f69b680 | 4187 | } |
6aa8b732 AK |
4188 | } |
4189 | ||
fb3600cc | 4190 | static int kvm_suspend(void) |
59ae6c6b | 4191 | { |
10474ae8 | 4192 | if (kvm_usage_count) |
75b7127c | 4193 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
4194 | return 0; |
4195 | } | |
4196 | ||
fb3600cc | 4197 | static void kvm_resume(void) |
59ae6c6b | 4198 | { |
ca84d1a2 | 4199 | if (kvm_usage_count) { |
2eb06c30 WL |
4200 | #ifdef CONFIG_LOCKDEP |
4201 | WARN_ON(lockdep_is_held(&kvm_count_lock)); | |
4202 | #endif | |
75b7127c | 4203 | hardware_enable_nolock(NULL); |
ca84d1a2 | 4204 | } |
59ae6c6b AK |
4205 | } |
4206 | ||
fb3600cc | 4207 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
4208 | .suspend = kvm_suspend, |
4209 | .resume = kvm_resume, | |
4210 | }; | |
4211 | ||
15ad7146 AK |
4212 | static inline |
4213 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
4214 | { | |
4215 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
4216 | } | |
4217 | ||
4218 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
4219 | { | |
4220 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 4221 | |
046ddeed | 4222 | WRITE_ONCE(vcpu->preempted, false); |
d73eb57b | 4223 | WRITE_ONCE(vcpu->ready, false); |
15ad7146 | 4224 | |
e790d9ef RK |
4225 | kvm_arch_sched_in(vcpu, cpu); |
4226 | ||
e9b11c17 | 4227 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
4228 | } |
4229 | ||
4230 | static void kvm_sched_out(struct preempt_notifier *pn, | |
4231 | struct task_struct *next) | |
4232 | { | |
4233 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4234 | ||
d73eb57b | 4235 | if (current->state == TASK_RUNNING) { |
046ddeed | 4236 | WRITE_ONCE(vcpu->preempted, true); |
d73eb57b WL |
4237 | WRITE_ONCE(vcpu->ready, true); |
4238 | } | |
e9b11c17 | 4239 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
4240 | } |
4241 | ||
f257d6dc SC |
4242 | static void check_processor_compat(void *rtn) |
4243 | { | |
4244 | *(int *)rtn = kvm_arch_check_processor_compat(); | |
4245 | } | |
4246 | ||
0ee75bea | 4247 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 4248 | struct module *module) |
6aa8b732 AK |
4249 | { |
4250 | int r; | |
002c7f7c | 4251 | int cpu; |
6aa8b732 | 4252 | |
f8c16bba ZX |
4253 | r = kvm_arch_init(opaque); |
4254 | if (r) | |
d2308784 | 4255 | goto out_fail; |
cb498ea2 | 4256 | |
7dac16c3 AH |
4257 | /* |
4258 | * kvm_arch_init makes sure there's at most one caller | |
4259 | * for architectures that support multiple implementations, | |
4260 | * like intel and amd on x86. | |
36343f6e PB |
4261 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
4262 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 4263 | */ |
36343f6e PB |
4264 | r = kvm_irqfd_init(); |
4265 | if (r) | |
4266 | goto out_irqfd; | |
7dac16c3 | 4267 | |
8437a617 | 4268 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
4269 | r = -ENOMEM; |
4270 | goto out_free_0; | |
4271 | } | |
4272 | ||
e9b11c17 | 4273 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 4274 | if (r < 0) |
7f59f492 | 4275 | goto out_free_0a; |
6aa8b732 | 4276 | |
002c7f7c | 4277 | for_each_online_cpu(cpu) { |
f257d6dc | 4278 | smp_call_function_single(cpu, check_processor_compat, &r, 1); |
002c7f7c | 4279 | if (r < 0) |
d2308784 | 4280 | goto out_free_1; |
002c7f7c YS |
4281 | } |
4282 | ||
73c1b41e | 4283 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 4284 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 4285 | if (r) |
d2308784 | 4286 | goto out_free_2; |
6aa8b732 AK |
4287 | register_reboot_notifier(&kvm_reboot_notifier); |
4288 | ||
c16f862d | 4289 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
4290 | if (!vcpu_align) |
4291 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
4292 | kvm_vcpu_cache = |
4293 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
4294 | SLAB_ACCOUNT, | |
4295 | offsetof(struct kvm_vcpu, arch), | |
4296 | sizeof_field(struct kvm_vcpu, arch), | |
4297 | NULL); | |
c16f862d RR |
4298 | if (!kvm_vcpu_cache) { |
4299 | r = -ENOMEM; | |
fb3600cc | 4300 | goto out_free_3; |
c16f862d RR |
4301 | } |
4302 | ||
af585b92 GN |
4303 | r = kvm_async_pf_init(); |
4304 | if (r) | |
4305 | goto out_free; | |
4306 | ||
6aa8b732 | 4307 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
4308 | kvm_vm_fops.owner = module; |
4309 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
4310 | |
4311 | r = misc_register(&kvm_dev); | |
4312 | if (r) { | |
1170adc6 | 4313 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 4314 | goto out_unreg; |
6aa8b732 AK |
4315 | } |
4316 | ||
fb3600cc RW |
4317 | register_syscore_ops(&kvm_syscore_ops); |
4318 | ||
15ad7146 AK |
4319 | kvm_preempt_ops.sched_in = kvm_sched_in; |
4320 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4321 | ||
929f45e3 | 4322 | kvm_init_debug(); |
0ea4ed8e | 4323 | |
3c3c29fd PB |
4324 | r = kvm_vfio_ops_init(); |
4325 | WARN_ON(r); | |
4326 | ||
c7addb90 | 4327 | return 0; |
6aa8b732 | 4328 | |
af585b92 GN |
4329 | out_unreg: |
4330 | kvm_async_pf_deinit(); | |
6aa8b732 | 4331 | out_free: |
c16f862d | 4332 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 4333 | out_free_3: |
6aa8b732 | 4334 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4335 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 4336 | out_free_2: |
d2308784 | 4337 | out_free_1: |
e9b11c17 | 4338 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
4339 | out_free_0a: |
4340 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 4341 | out_free_0: |
a0f155e9 | 4342 | kvm_irqfd_exit(); |
36343f6e | 4343 | out_irqfd: |
7dac16c3 AH |
4344 | kvm_arch_exit(); |
4345 | out_fail: | |
6aa8b732 AK |
4346 | return r; |
4347 | } | |
cb498ea2 | 4348 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 4349 | |
cb498ea2 | 4350 | void kvm_exit(void) |
6aa8b732 | 4351 | { |
4bd33b56 | 4352 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 4353 | misc_deregister(&kvm_dev); |
c16f862d | 4354 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 4355 | kvm_async_pf_deinit(); |
fb3600cc | 4356 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 4357 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4358 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 4359 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 4360 | kvm_arch_hardware_unsetup(); |
f8c16bba | 4361 | kvm_arch_exit(); |
a0f155e9 | 4362 | kvm_irqfd_exit(); |
7f59f492 | 4363 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 4364 | kvm_vfio_ops_exit(); |
6aa8b732 | 4365 | } |
cb498ea2 | 4366 | EXPORT_SYMBOL_GPL(kvm_exit); |