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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> |
c57c8046 | 53 | #include <linux/kthread.h> |
6aa8b732 | 54 | |
e495606d | 55 | #include <asm/processor.h> |
2ea75be3 | 56 | #include <asm/ioctl.h> |
7c0f6ba6 | 57 | #include <linux/uaccess.h> |
3e021bf5 | 58 | #include <asm/pgtable.h> |
6aa8b732 | 59 | |
5f94c174 | 60 | #include "coalesced_mmio.h" |
af585b92 | 61 | #include "async_pf.h" |
3c3c29fd | 62 | #include "vfio.h" |
5f94c174 | 63 | |
229456fc MT |
64 | #define CREATE_TRACE_POINTS |
65 | #include <trace/events/kvm.h> | |
66 | ||
536a6f88 JF |
67 | /* Worst case buffer size needed for holding an integer. */ |
68 | #define ITOA_MAX_LEN 12 | |
69 | ||
6aa8b732 AK |
70 | MODULE_AUTHOR("Qumranet"); |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
920552b2 | 73 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 74 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 75 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 76 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 77 | |
aca6ff29 | 78 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 79 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 80 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 81 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 | 82 | |
49113d36 NW |
83 | /* The start value to grow halt_poll_ns from */ |
84 | unsigned int halt_poll_ns_grow_start = 10000; /* 10us */ | |
85 | module_param(halt_poll_ns_grow_start, uint, 0644); | |
86 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start); | |
87 | ||
aca6ff29 | 88 | /* Default resets per-vcpu halt_poll_ns . */ |
ec76d819 | 89 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 90 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 91 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 92 | |
fa40a821 MT |
93 | /* |
94 | * Ordering of locks: | |
95 | * | |
b7d409de | 96 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
97 | */ |
98 | ||
0d9ce162 | 99 | DEFINE_MUTEX(kvm_lock); |
4a937f96 | 100 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 101 | LIST_HEAD(vm_list); |
133de902 | 102 | |
7f59f492 | 103 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 104 | static int kvm_usage_count; |
10474ae8 | 105 | static atomic_t hardware_enable_failed; |
1b6c0168 | 106 | |
aaba298c | 107 | static struct kmem_cache *kvm_vcpu_cache; |
1165f5fe | 108 | |
15ad7146 | 109 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
7495e22b | 110 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu); |
15ad7146 | 111 | |
76f7c879 | 112 | struct dentry *kvm_debugfs_dir; |
e23a808b | 113 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 114 | |
536a6f88 | 115 | static int kvm_debugfs_num_entries; |
09cbcef6 | 116 | static const struct file_operations stat_fops_per_vm; |
536a6f88 | 117 | |
bccf2150 AK |
118 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
119 | unsigned long arg); | |
de8e5d74 | 120 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
121 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
122 | unsigned long arg); | |
7ddfd3e0 MZ |
123 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
124 | #else | |
9cb09e7c MZ |
125 | /* |
126 | * For architectures that don't implement a compat infrastructure, | |
127 | * adopt a double line of defense: | |
128 | * - Prevent a compat task from opening /dev/kvm | |
129 | * - If the open has been done by a 64bit task, and the KVM fd | |
130 | * passed to a compat task, let the ioctls fail. | |
131 | */ | |
7ddfd3e0 MZ |
132 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, |
133 | unsigned long arg) { return -EINVAL; } | |
b9876e6d MZ |
134 | |
135 | static int kvm_no_compat_open(struct inode *inode, struct file *file) | |
136 | { | |
137 | return is_compat_task() ? -ENODEV : 0; | |
138 | } | |
139 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \ | |
140 | .open = kvm_no_compat_open | |
1dda606c | 141 | #endif |
10474ae8 AG |
142 | static int hardware_enable_all(void); |
143 | static void hardware_disable_all(void); | |
bccf2150 | 144 | |
e93f8a0f | 145 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 146 | |
bc009e43 | 147 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 148 | |
52480137 | 149 | __visible bool kvm_rebooting; |
b7c4145b | 150 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 151 | |
286de8f6 CI |
152 | #define KVM_EVENT_CREATE_VM 0 |
153 | #define KVM_EVENT_DESTROY_VM 1 | |
154 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
155 | static unsigned long long kvm_createvm_count; | |
156 | static unsigned long long kvm_active_vms; | |
157 | ||
93065ac7 MH |
158 | __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
159 | unsigned long start, unsigned long end, bool blockable) | |
b1394e74 | 160 | { |
93065ac7 | 161 | return 0; |
b1394e74 RK |
162 | } |
163 | ||
a78986aa SC |
164 | bool kvm_is_zone_device_pfn(kvm_pfn_t pfn) |
165 | { | |
166 | /* | |
167 | * The metadata used by is_zone_device_page() to determine whether or | |
168 | * not a page is ZONE_DEVICE is guaranteed to be valid if and only if | |
169 | * the device has been pinned, e.g. by get_user_pages(). WARN if the | |
170 | * page_count() is zero to help detect bad usage of this helper. | |
171 | */ | |
172 | if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn)))) | |
173 | return false; | |
174 | ||
175 | return is_zone_device_page(pfn_to_page(pfn)); | |
176 | } | |
177 | ||
ba049e93 | 178 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
cbff90a7 | 179 | { |
a78986aa SC |
180 | /* |
181 | * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting | |
182 | * perspective they are "normal" pages, albeit with slightly different | |
183 | * usage rules. | |
184 | */ | |
11feeb49 | 185 | if (pfn_valid(pfn)) |
a78986aa | 186 | return PageReserved(pfn_to_page(pfn)) && |
7df003c8 | 187 | !is_zero_pfn(pfn) && |
a78986aa | 188 | !kvm_is_zone_device_pfn(pfn); |
cbff90a7 BAY |
189 | |
190 | return true; | |
191 | } | |
192 | ||
005ba37c SC |
193 | bool kvm_is_transparent_hugepage(kvm_pfn_t pfn) |
194 | { | |
195 | struct page *page = pfn_to_page(pfn); | |
196 | ||
197 | if (!PageTransCompoundMap(page)) | |
198 | return false; | |
199 | ||
200 | return is_transparent_hugepage(compound_head(page)); | |
201 | } | |
202 | ||
bccf2150 AK |
203 | /* |
204 | * Switches to specified vcpu, until a matching vcpu_put() | |
205 | */ | |
ec7660cc | 206 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 207 | { |
ec7660cc | 208 | int cpu = get_cpu(); |
7495e22b PB |
209 | |
210 | __this_cpu_write(kvm_running_vcpu, vcpu); | |
15ad7146 | 211 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 212 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 213 | put_cpu(); |
6aa8b732 | 214 | } |
2f1fe811 | 215 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 216 | |
313a3dc7 | 217 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 218 | { |
15ad7146 | 219 | preempt_disable(); |
313a3dc7 | 220 | kvm_arch_vcpu_put(vcpu); |
15ad7146 | 221 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
7495e22b | 222 | __this_cpu_write(kvm_running_vcpu, NULL); |
15ad7146 | 223 | preempt_enable(); |
6aa8b732 | 224 | } |
2f1fe811 | 225 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 226 | |
7a97cec2 PB |
227 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
228 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
229 | { | |
230 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
231 | ||
232 | /* | |
233 | * We need to wait for the VCPU to reenable interrupts and get out of | |
234 | * READING_SHADOW_PAGE_TABLES mode. | |
235 | */ | |
236 | if (req & KVM_REQUEST_WAIT) | |
237 | return mode != OUTSIDE_GUEST_MODE; | |
238 | ||
239 | /* | |
240 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
241 | */ | |
242 | return mode == IN_GUEST_MODE; | |
243 | } | |
244 | ||
d9e368d6 AK |
245 | static void ack_flush(void *_completed) |
246 | { | |
d9e368d6 AK |
247 | } |
248 | ||
b49defe8 PB |
249 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) |
250 | { | |
251 | if (unlikely(!cpus)) | |
252 | cpus = cpu_online_mask; | |
253 | ||
254 | if (cpumask_empty(cpus)) | |
255 | return false; | |
256 | ||
257 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
258 | return true; | |
259 | } | |
260 | ||
7053df4e | 261 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
54163a34 | 262 | struct kvm_vcpu *except, |
7053df4e | 263 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) |
d9e368d6 | 264 | { |
597a5f55 | 265 | int i, cpu, me; |
d9e368d6 | 266 | struct kvm_vcpu *vcpu; |
7053df4e | 267 | bool called; |
6ef7a1bc | 268 | |
3cba4130 | 269 | me = get_cpu(); |
7053df4e | 270 | |
988a2cae | 271 | kvm_for_each_vcpu(i, vcpu, kvm) { |
54163a34 SS |
272 | if ((vcpu_bitmap && !test_bit(i, vcpu_bitmap)) || |
273 | vcpu == except) | |
7053df4e VK |
274 | continue; |
275 | ||
3cba4130 | 276 | kvm_make_request(req, vcpu); |
d9e368d6 | 277 | cpu = vcpu->cpu; |
6b7e2d09 | 278 | |
178f02ff RK |
279 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) |
280 | continue; | |
6c6e8360 | 281 | |
7053df4e | 282 | if (tmp != NULL && cpu != -1 && cpu != me && |
7a97cec2 | 283 | kvm_request_needs_ipi(vcpu, req)) |
7053df4e | 284 | __cpumask_set_cpu(cpu, tmp); |
49846896 | 285 | } |
7053df4e VK |
286 | |
287 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 288 | put_cpu(); |
7053df4e VK |
289 | |
290 | return called; | |
291 | } | |
292 | ||
54163a34 SS |
293 | bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req, |
294 | struct kvm_vcpu *except) | |
7053df4e VK |
295 | { |
296 | cpumask_var_t cpus; | |
297 | bool called; | |
7053df4e VK |
298 | |
299 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
300 | ||
54163a34 | 301 | called = kvm_make_vcpus_request_mask(kvm, req, except, NULL, cpus); |
7053df4e | 302 | |
6ef7a1bc | 303 | free_cpumask_var(cpus); |
49846896 | 304 | return called; |
d9e368d6 AK |
305 | } |
306 | ||
54163a34 SS |
307 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
308 | { | |
309 | return kvm_make_all_cpus_request_except(kvm, req, NULL); | |
310 | } | |
311 | ||
a6d51016 | 312 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 313 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 314 | { |
4ae3cb3a LT |
315 | /* |
316 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
317 | * kvm_make_all_cpus_request. | |
318 | */ | |
319 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
320 | ||
321 | /* | |
322 | * We want to publish modifications to the page tables before reading | |
323 | * mode. Pairs with a memory barrier in arch-specific code. | |
324 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
325 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
326 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
327 | * | |
328 | * There is already an smp_mb__after_atomic() before | |
329 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
330 | * barrier here. | |
331 | */ | |
b08660e5 TL |
332 | if (!kvm_arch_flush_remote_tlb(kvm) |
333 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
49846896 | 334 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 335 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 336 | } |
2ba9f0d8 | 337 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 338 | #endif |
2e53d63a | 339 | |
49846896 RR |
340 | void kvm_reload_remote_mmus(struct kvm *kvm) |
341 | { | |
445b8236 | 342 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 343 | } |
2e53d63a | 344 | |
8bd826d6 | 345 | static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
fb3f0f51 | 346 | { |
fb3f0f51 RR |
347 | mutex_init(&vcpu->mutex); |
348 | vcpu->cpu = -1; | |
fb3f0f51 RR |
349 | vcpu->kvm = kvm; |
350 | vcpu->vcpu_id = id; | |
34bb10b7 | 351 | vcpu->pid = NULL; |
8577370f | 352 | init_swait_queue_head(&vcpu->wq); |
af585b92 | 353 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 354 | |
bf9f6ac8 FW |
355 | vcpu->pre_pcpu = -1; |
356 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
357 | ||
4c088493 R |
358 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
359 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 360 | vcpu->preempted = false; |
d73eb57b | 361 | vcpu->ready = false; |
d5c48deb | 362 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
fb3f0f51 | 363 | } |
fb3f0f51 | 364 | |
4543bdc0 SC |
365 | void kvm_vcpu_destroy(struct kvm_vcpu *vcpu) |
366 | { | |
367 | kvm_arch_vcpu_destroy(vcpu); | |
e529ef66 | 368 | |
9941d224 SC |
369 | /* |
370 | * No need for rcu_read_lock as VCPU_RUN is the only place that changes | |
371 | * the vcpu->pid pointer, and at destruction time all file descriptors | |
372 | * are already gone. | |
373 | */ | |
374 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
375 | ||
8bd826d6 | 376 | free_page((unsigned long)vcpu->run); |
e529ef66 | 377 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
4543bdc0 SC |
378 | } |
379 | EXPORT_SYMBOL_GPL(kvm_vcpu_destroy); | |
380 | ||
e930bffe AA |
381 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
382 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
383 | { | |
384 | return container_of(mn, struct kvm, mmu_notifier); | |
385 | } | |
386 | ||
3da0dd43 IE |
387 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
388 | struct mm_struct *mm, | |
389 | unsigned long address, | |
390 | pte_t pte) | |
391 | { | |
392 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 393 | int idx; |
3da0dd43 | 394 | |
bc6678a3 | 395 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
396 | spin_lock(&kvm->mmu_lock); |
397 | kvm->mmu_notifier_seq++; | |
0cf853c5 LT |
398 | |
399 | if (kvm_set_spte_hva(kvm, address, pte)) | |
400 | kvm_flush_remote_tlbs(kvm); | |
401 | ||
3da0dd43 | 402 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 403 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
404 | } |
405 | ||
93065ac7 | 406 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
5d6527a7 | 407 | const struct mmu_notifier_range *range) |
e930bffe AA |
408 | { |
409 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 410 | int need_tlb_flush = 0, idx; |
93065ac7 | 411 | int ret; |
e930bffe | 412 | |
bc6678a3 | 413 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
414 | spin_lock(&kvm->mmu_lock); |
415 | /* | |
416 | * The count increase must become visible at unlock time as no | |
417 | * spte can be established without taking the mmu_lock and | |
418 | * count is also read inside the mmu_lock critical section. | |
419 | */ | |
420 | kvm->mmu_notifier_count++; | |
5d6527a7 | 421 | need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end); |
a4ee1ca4 | 422 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
423 | /* we've to flush the tlb before the pages can be freed */ |
424 | if (need_tlb_flush) | |
425 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
426 | |
427 | spin_unlock(&kvm->mmu_lock); | |
b1394e74 | 428 | |
5d6527a7 | 429 | ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start, |
dfcd6660 JG |
430 | range->end, |
431 | mmu_notifier_range_blockable(range)); | |
b1394e74 | 432 | |
565f3be2 | 433 | srcu_read_unlock(&kvm->srcu, idx); |
93065ac7 MH |
434 | |
435 | return ret; | |
e930bffe AA |
436 | } |
437 | ||
438 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
5d6527a7 | 439 | const struct mmu_notifier_range *range) |
e930bffe AA |
440 | { |
441 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
442 | ||
443 | spin_lock(&kvm->mmu_lock); | |
444 | /* | |
445 | * This sequence increase will notify the kvm page fault that | |
446 | * the page that is going to be mapped in the spte could have | |
447 | * been freed. | |
448 | */ | |
449 | kvm->mmu_notifier_seq++; | |
a355aa54 | 450 | smp_wmb(); |
e930bffe AA |
451 | /* |
452 | * The above sequence increase must be visible before the | |
a355aa54 PM |
453 | * below count decrease, which is ensured by the smp_wmb above |
454 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
455 | */ |
456 | kvm->mmu_notifier_count--; | |
457 | spin_unlock(&kvm->mmu_lock); | |
458 | ||
459 | BUG_ON(kvm->mmu_notifier_count < 0); | |
460 | } | |
461 | ||
462 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
463 | struct mm_struct *mm, | |
57128468 ALC |
464 | unsigned long start, |
465 | unsigned long end) | |
e930bffe AA |
466 | { |
467 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 468 | int young, idx; |
e930bffe | 469 | |
bc6678a3 | 470 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 471 | spin_lock(&kvm->mmu_lock); |
e930bffe | 472 | |
57128468 | 473 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
474 | if (young) |
475 | kvm_flush_remote_tlbs(kvm); | |
476 | ||
565f3be2 TY |
477 | spin_unlock(&kvm->mmu_lock); |
478 | srcu_read_unlock(&kvm->srcu, idx); | |
479 | ||
e930bffe AA |
480 | return young; |
481 | } | |
482 | ||
1d7715c6 VD |
483 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
484 | struct mm_struct *mm, | |
485 | unsigned long start, | |
486 | unsigned long end) | |
487 | { | |
488 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
489 | int young, idx; | |
490 | ||
491 | idx = srcu_read_lock(&kvm->srcu); | |
492 | spin_lock(&kvm->mmu_lock); | |
493 | /* | |
494 | * Even though we do not flush TLB, this will still adversely | |
495 | * affect performance on pre-Haswell Intel EPT, where there is | |
496 | * no EPT Access Bit to clear so that we have to tear down EPT | |
497 | * tables instead. If we find this unacceptable, we can always | |
498 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
499 | * do anything on clear_young. | |
500 | * | |
501 | * Also note that currently we never issue secondary TLB flushes | |
502 | * from clear_young, leaving this job up to the regular system | |
503 | * cadence. If we find this inaccurate, we might come up with a | |
504 | * more sophisticated heuristic later. | |
505 | */ | |
506 | young = kvm_age_hva(kvm, start, end); | |
507 | spin_unlock(&kvm->mmu_lock); | |
508 | srcu_read_unlock(&kvm->srcu, idx); | |
509 | ||
510 | return young; | |
511 | } | |
512 | ||
8ee53820 AA |
513 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
514 | struct mm_struct *mm, | |
515 | unsigned long address) | |
516 | { | |
517 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
518 | int young, idx; | |
519 | ||
520 | idx = srcu_read_lock(&kvm->srcu); | |
521 | spin_lock(&kvm->mmu_lock); | |
522 | young = kvm_test_age_hva(kvm, address); | |
523 | spin_unlock(&kvm->mmu_lock); | |
524 | srcu_read_unlock(&kvm->srcu, idx); | |
525 | ||
526 | return young; | |
527 | } | |
528 | ||
85db06e5 MT |
529 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
530 | struct mm_struct *mm) | |
531 | { | |
532 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
533 | int idx; |
534 | ||
535 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 536 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 537 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
538 | } |
539 | ||
e930bffe | 540 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e930bffe AA |
541 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
542 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
543 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 544 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 545 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 546 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 547 | .release = kvm_mmu_notifier_release, |
e930bffe | 548 | }; |
4c07b0a4 AK |
549 | |
550 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
551 | { | |
552 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
553 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
554 | } | |
555 | ||
556 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
557 | ||
558 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
559 | { | |
560 | return 0; | |
561 | } | |
562 | ||
e930bffe AA |
563 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
564 | ||
a47d2b07 | 565 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
566 | { |
567 | int i; | |
a47d2b07 | 568 | struct kvm_memslots *slots; |
bf3e05bc | 569 | |
b12ce36a | 570 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
a47d2b07 PB |
571 | if (!slots) |
572 | return NULL; | |
573 | ||
bf3e05bc | 574 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
36947254 | 575 | slots->id_to_index[i] = -1; |
a47d2b07 PB |
576 | |
577 | return slots; | |
578 | } | |
579 | ||
580 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
581 | { | |
582 | if (!memslot->dirty_bitmap) | |
583 | return; | |
584 | ||
585 | kvfree(memslot->dirty_bitmap); | |
586 | memslot->dirty_bitmap = NULL; | |
587 | } | |
588 | ||
e96c81ee | 589 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) |
a47d2b07 | 590 | { |
e96c81ee | 591 | kvm_destroy_dirty_bitmap(slot); |
a47d2b07 | 592 | |
e96c81ee | 593 | kvm_arch_free_memslot(kvm, slot); |
a47d2b07 | 594 | |
e96c81ee SC |
595 | slot->flags = 0; |
596 | slot->npages = 0; | |
a47d2b07 PB |
597 | } |
598 | ||
599 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
600 | { | |
601 | struct kvm_memory_slot *memslot; | |
602 | ||
603 | if (!slots) | |
604 | return; | |
605 | ||
606 | kvm_for_each_memslot(memslot, slots) | |
e96c81ee | 607 | kvm_free_memslot(kvm, memslot); |
a47d2b07 PB |
608 | |
609 | kvfree(slots); | |
bf3e05bc XG |
610 | } |
611 | ||
536a6f88 JF |
612 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
613 | { | |
614 | int i; | |
615 | ||
616 | if (!kvm->debugfs_dentry) | |
617 | return; | |
618 | ||
619 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
620 | ||
9d5a1dce LC |
621 | if (kvm->debugfs_stat_data) { |
622 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
623 | kfree(kvm->debugfs_stat_data[i]); | |
624 | kfree(kvm->debugfs_stat_data); | |
625 | } | |
536a6f88 JF |
626 | } |
627 | ||
628 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
629 | { | |
630 | char dir_name[ITOA_MAX_LEN * 2]; | |
631 | struct kvm_stat_data *stat_data; | |
632 | struct kvm_stats_debugfs_item *p; | |
633 | ||
634 | if (!debugfs_initialized()) | |
635 | return 0; | |
636 | ||
637 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
929f45e3 | 638 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir); |
536a6f88 JF |
639 | |
640 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
641 | sizeof(*kvm->debugfs_stat_data), | |
b12ce36a | 642 | GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
643 | if (!kvm->debugfs_stat_data) |
644 | return -ENOMEM; | |
645 | ||
646 | for (p = debugfs_entries; p->name; p++) { | |
b12ce36a | 647 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
648 | if (!stat_data) |
649 | return -ENOMEM; | |
650 | ||
651 | stat_data->kvm = kvm; | |
09cbcef6 | 652 | stat_data->dbgfs_item = p; |
536a6f88 | 653 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; |
09cbcef6 MP |
654 | debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p), |
655 | kvm->debugfs_dentry, stat_data, | |
656 | &stat_fops_per_vm); | |
536a6f88 JF |
657 | } |
658 | return 0; | |
659 | } | |
660 | ||
1aa9b957 JS |
661 | /* |
662 | * Called after the VM is otherwise initialized, but just before adding it to | |
663 | * the vm_list. | |
664 | */ | |
665 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | |
666 | { | |
667 | return 0; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Called just after removing the VM from the vm_list, but before doing any | |
672 | * other destruction. | |
673 | */ | |
674 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | |
675 | { | |
676 | } | |
677 | ||
e08b9637 | 678 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 679 | { |
d89f5eff | 680 | struct kvm *kvm = kvm_arch_alloc_vm(); |
9121923c JM |
681 | int r = -ENOMEM; |
682 | int i; | |
6aa8b732 | 683 | |
d89f5eff JK |
684 | if (!kvm) |
685 | return ERR_PTR(-ENOMEM); | |
686 | ||
e9ad4ec8 | 687 | spin_lock_init(&kvm->mmu_lock); |
f1f10076 | 688 | mmgrab(current->mm); |
e9ad4ec8 PB |
689 | kvm->mm = current->mm; |
690 | kvm_eventfd_init(kvm); | |
691 | mutex_init(&kvm->lock); | |
692 | mutex_init(&kvm->irq_lock); | |
693 | mutex_init(&kvm->slots_lock); | |
e9ad4ec8 PB |
694 | INIT_LIST_HEAD(&kvm->devices); |
695 | ||
1e702d9a AW |
696 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
697 | ||
8a44119a PB |
698 | if (init_srcu_struct(&kvm->srcu)) |
699 | goto out_err_no_srcu; | |
700 | if (init_srcu_struct(&kvm->irq_srcu)) | |
701 | goto out_err_no_irq_srcu; | |
702 | ||
e2d3fcaf | 703 | refcount_set(&kvm->users_count, 1); |
f481b069 | 704 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 | 705 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
9121923c | 706 | |
4bd518f1 | 707 | if (!slots) |
a97b0e77 | 708 | goto out_err_no_arch_destroy_vm; |
0e32958e | 709 | /* Generations must be different for each address space. */ |
164bf7e5 | 710 | slots->generation = i; |
4bd518f1 | 711 | rcu_assign_pointer(kvm->memslots[i], slots); |
f481b069 | 712 | } |
00f034a1 | 713 | |
e93f8a0f | 714 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 | 715 | rcu_assign_pointer(kvm->buses[i], |
b12ce36a | 716 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT)); |
57e7fbee | 717 | if (!kvm->buses[i]) |
a97b0e77 | 718 | goto out_err_no_arch_destroy_vm; |
e93f8a0f | 719 | } |
e930bffe | 720 | |
e08b9637 | 721 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 722 | if (r) |
a97b0e77 | 723 | goto out_err_no_arch_destroy_vm; |
10474ae8 AG |
724 | |
725 | r = hardware_enable_all(); | |
726 | if (r) | |
719d93cd | 727 | goto out_err_no_disable; |
10474ae8 | 728 | |
c77dcacb | 729 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 730 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 731 | #endif |
6aa8b732 | 732 | |
74b5c5bf | 733 | r = kvm_init_mmu_notifier(kvm); |
1aa9b957 JS |
734 | if (r) |
735 | goto out_err_no_mmu_notifier; | |
736 | ||
737 | r = kvm_arch_post_init_vm(kvm); | |
74b5c5bf MW |
738 | if (r) |
739 | goto out_err; | |
740 | ||
0d9ce162 | 741 | mutex_lock(&kvm_lock); |
5e58cfe4 | 742 | list_add(&kvm->vm_list, &vm_list); |
0d9ce162 | 743 | mutex_unlock(&kvm_lock); |
d89f5eff | 744 | |
2ecd9d29 PZ |
745 | preempt_notifier_inc(); |
746 | ||
f17abe9a | 747 | return kvm; |
10474ae8 AG |
748 | |
749 | out_err: | |
1aa9b957 JS |
750 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
751 | if (kvm->mmu_notifier.ops) | |
752 | mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); | |
753 | #endif | |
754 | out_err_no_mmu_notifier: | |
10474ae8 | 755 | hardware_disable_all(); |
719d93cd | 756 | out_err_no_disable: |
a97b0e77 | 757 | kvm_arch_destroy_vm(kvm); |
a97b0e77 | 758 | out_err_no_arch_destroy_vm: |
e2d3fcaf | 759 | WARN_ON_ONCE(!refcount_dec_and_test(&kvm->users_count)); |
e93f8a0f | 760 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 761 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 762 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 763 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
8a44119a PB |
764 | cleanup_srcu_struct(&kvm->irq_srcu); |
765 | out_err_no_irq_srcu: | |
766 | cleanup_srcu_struct(&kvm->srcu); | |
767 | out_err_no_srcu: | |
d89f5eff | 768 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 769 | mmdrop(current->mm); |
10474ae8 | 770 | return ERR_PTR(r); |
f17abe9a AK |
771 | } |
772 | ||
07f0a7bd SW |
773 | static void kvm_destroy_devices(struct kvm *kvm) |
774 | { | |
e6e3b5a6 | 775 | struct kvm_device *dev, *tmp; |
07f0a7bd | 776 | |
a28ebea2 CD |
777 | /* |
778 | * We do not need to take the kvm->lock here, because nobody else | |
779 | * has a reference to the struct kvm at this point and therefore | |
780 | * cannot access the devices list anyhow. | |
781 | */ | |
e6e3b5a6 GT |
782 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
783 | list_del(&dev->vm_node); | |
07f0a7bd SW |
784 | dev->ops->destroy(dev); |
785 | } | |
786 | } | |
787 | ||
f17abe9a AK |
788 | static void kvm_destroy_vm(struct kvm *kvm) |
789 | { | |
e93f8a0f | 790 | int i; |
6d4e4c4f AK |
791 | struct mm_struct *mm = kvm->mm; |
792 | ||
286de8f6 | 793 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 794 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 795 | kvm_arch_sync_events(kvm); |
0d9ce162 | 796 | mutex_lock(&kvm_lock); |
133de902 | 797 | list_del(&kvm->vm_list); |
0d9ce162 | 798 | mutex_unlock(&kvm_lock); |
1aa9b957 JS |
799 | kvm_arch_pre_destroy_vm(kvm); |
800 | ||
399ec807 | 801 | kvm_free_irq_routing(kvm); |
df630b8c | 802 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 803 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 804 | |
4a12f951 CB |
805 | if (bus) |
806 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
807 | kvm->buses[i] = NULL; |
808 | } | |
980da6ce | 809 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
810 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
811 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 812 | #else |
2df72e9b | 813 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 814 | #endif |
d19a9cd2 | 815 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 816 | kvm_destroy_devices(kvm); |
f481b069 | 817 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 818 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 819 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
820 | cleanup_srcu_struct(&kvm->srcu); |
821 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 822 | preempt_notifier_dec(); |
10474ae8 | 823 | hardware_disable_all(); |
6d4e4c4f | 824 | mmdrop(mm); |
f17abe9a AK |
825 | } |
826 | ||
d39f13b0 IE |
827 | void kvm_get_kvm(struct kvm *kvm) |
828 | { | |
e3736c3e | 829 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
830 | } |
831 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
832 | ||
833 | void kvm_put_kvm(struct kvm *kvm) | |
834 | { | |
e3736c3e | 835 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
836 | kvm_destroy_vm(kvm); |
837 | } | |
838 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
839 | ||
149487bd SC |
840 | /* |
841 | * Used to put a reference that was taken on behalf of an object associated | |
842 | * with a user-visible file descriptor, e.g. a vcpu or device, if installation | |
843 | * of the new file descriptor fails and the reference cannot be transferred to | |
844 | * its final owner. In such cases, the caller is still actively using @kvm and | |
845 | * will fail miserably if the refcount unexpectedly hits zero. | |
846 | */ | |
847 | void kvm_put_kvm_no_destroy(struct kvm *kvm) | |
848 | { | |
849 | WARN_ON(refcount_dec_and_test(&kvm->users_count)); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy); | |
d39f13b0 | 852 | |
f17abe9a AK |
853 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
854 | { | |
855 | struct kvm *kvm = filp->private_data; | |
856 | ||
721eecbf GH |
857 | kvm_irqfd_release(kvm); |
858 | ||
d39f13b0 | 859 | kvm_put_kvm(kvm); |
6aa8b732 AK |
860 | return 0; |
861 | } | |
862 | ||
515a0127 TY |
863 | /* |
864 | * Allocation size is twice as large as the actual dirty bitmap size. | |
0dff0846 | 865 | * See kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 866 | */ |
3c9bd400 | 867 | static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot *memslot) |
a36a57b1 | 868 | { |
515a0127 | 869 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 870 | |
b12ce36a | 871 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT); |
a36a57b1 TY |
872 | if (!memslot->dirty_bitmap) |
873 | return -ENOMEM; | |
874 | ||
a36a57b1 TY |
875 | return 0; |
876 | } | |
877 | ||
bf3e05bc | 878 | /* |
0577d1ab SC |
879 | * Delete a memslot by decrementing the number of used slots and shifting all |
880 | * other entries in the array forward one spot. | |
bf3e05bc | 881 | */ |
0577d1ab SC |
882 | static inline void kvm_memslot_delete(struct kvm_memslots *slots, |
883 | struct kvm_memory_slot *memslot) | |
bf3e05bc | 884 | { |
063584d4 | 885 | struct kvm_memory_slot *mslots = slots->memslots; |
0577d1ab | 886 | int i; |
f85e2cb5 | 887 | |
0577d1ab SC |
888 | if (WARN_ON(slots->id_to_index[memslot->id] == -1)) |
889 | return; | |
0e60b079 | 890 | |
0577d1ab SC |
891 | slots->used_slots--; |
892 | ||
0774a964 SC |
893 | if (atomic_read(&slots->lru_slot) >= slots->used_slots) |
894 | atomic_set(&slots->lru_slot, 0); | |
895 | ||
0577d1ab | 896 | for (i = slots->id_to_index[memslot->id]; i < slots->used_slots; i++) { |
7f379cff IM |
897 | mslots[i] = mslots[i + 1]; |
898 | slots->id_to_index[mslots[i].id] = i; | |
7f379cff | 899 | } |
0577d1ab SC |
900 | mslots[i] = *memslot; |
901 | slots->id_to_index[memslot->id] = -1; | |
902 | } | |
903 | ||
904 | /* | |
905 | * "Insert" a new memslot by incrementing the number of used slots. Returns | |
906 | * the new slot's initial index into the memslots array. | |
907 | */ | |
908 | static inline int kvm_memslot_insert_back(struct kvm_memslots *slots) | |
909 | { | |
910 | return slots->used_slots++; | |
911 | } | |
912 | ||
913 | /* | |
914 | * Move a changed memslot backwards in the array by shifting existing slots | |
915 | * with a higher GFN toward the front of the array. Note, the changed memslot | |
916 | * itself is not preserved in the array, i.e. not swapped at this time, only | |
917 | * its new index into the array is tracked. Returns the changed memslot's | |
918 | * current index into the memslots array. | |
919 | */ | |
920 | static inline int kvm_memslot_move_backward(struct kvm_memslots *slots, | |
921 | struct kvm_memory_slot *memslot) | |
922 | { | |
923 | struct kvm_memory_slot *mslots = slots->memslots; | |
924 | int i; | |
925 | ||
926 | if (WARN_ON_ONCE(slots->id_to_index[memslot->id] == -1) || | |
927 | WARN_ON_ONCE(!slots->used_slots)) | |
928 | return -1; | |
efbeec70 PB |
929 | |
930 | /* | |
0577d1ab SC |
931 | * Move the target memslot backward in the array by shifting existing |
932 | * memslots with a higher GFN (than the target memslot) towards the | |
933 | * front of the array. | |
efbeec70 | 934 | */ |
0577d1ab SC |
935 | for (i = slots->id_to_index[memslot->id]; i < slots->used_slots - 1; i++) { |
936 | if (memslot->base_gfn > mslots[i + 1].base_gfn) | |
937 | break; | |
938 | ||
939 | WARN_ON_ONCE(memslot->base_gfn == mslots[i + 1].base_gfn); | |
f85e2cb5 | 940 | |
0577d1ab SC |
941 | /* Shift the next memslot forward one and update its index. */ |
942 | mslots[i] = mslots[i + 1]; | |
943 | slots->id_to_index[mslots[i].id] = i; | |
944 | } | |
945 | return i; | |
946 | } | |
947 | ||
948 | /* | |
949 | * Move a changed memslot forwards in the array by shifting existing slots with | |
950 | * a lower GFN toward the back of the array. Note, the changed memslot itself | |
951 | * is not preserved in the array, i.e. not swapped at this time, only its new | |
952 | * index into the array is tracked. Returns the changed memslot's final index | |
953 | * into the memslots array. | |
954 | */ | |
955 | static inline int kvm_memslot_move_forward(struct kvm_memslots *slots, | |
956 | struct kvm_memory_slot *memslot, | |
957 | int start) | |
958 | { | |
959 | struct kvm_memory_slot *mslots = slots->memslots; | |
960 | int i; | |
961 | ||
962 | for (i = start; i > 0; i--) { | |
963 | if (memslot->base_gfn < mslots[i - 1].base_gfn) | |
964 | break; | |
965 | ||
966 | WARN_ON_ONCE(memslot->base_gfn == mslots[i - 1].base_gfn); | |
967 | ||
968 | /* Shift the next memslot back one and update its index. */ | |
969 | mslots[i] = mslots[i - 1]; | |
970 | slots->id_to_index[mslots[i].id] = i; | |
971 | } | |
972 | return i; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Re-sort memslots based on their GFN to account for an added, deleted, or | |
977 | * moved memslot. Sorting memslots by GFN allows using a binary search during | |
978 | * memslot lookup. | |
979 | * | |
980 | * IMPORTANT: Slots are sorted from highest GFN to lowest GFN! I.e. the entry | |
981 | * at memslots[0] has the highest GFN. | |
982 | * | |
983 | * The sorting algorithm takes advantage of having initially sorted memslots | |
984 | * and knowing the position of the changed memslot. Sorting is also optimized | |
985 | * by not swapping the updated memslot and instead only shifting other memslots | |
986 | * and tracking the new index for the update memslot. Only once its final | |
987 | * index is known is the updated memslot copied into its position in the array. | |
988 | * | |
989 | * - When deleting a memslot, the deleted memslot simply needs to be moved to | |
990 | * the end of the array. | |
991 | * | |
992 | * - When creating a memslot, the algorithm "inserts" the new memslot at the | |
993 | * end of the array and then it forward to its correct location. | |
994 | * | |
995 | * - When moving a memslot, the algorithm first moves the updated memslot | |
996 | * backward to handle the scenario where the memslot's GFN was changed to a | |
997 | * lower value. update_memslots() then falls through and runs the same flow | |
998 | * as creating a memslot to move the memslot forward to handle the scenario | |
999 | * where its GFN was changed to a higher value. | |
1000 | * | |
1001 | * Note, slots are sorted from highest->lowest instead of lowest->highest for | |
1002 | * historical reasons. Originally, invalid memslots where denoted by having | |
1003 | * GFN=0, thus sorting from highest->lowest naturally sorted invalid memslots | |
1004 | * to the end of the array. The current algorithm uses dedicated logic to | |
1005 | * delete a memslot and thus does not rely on invalid memslots having GFN=0. | |
1006 | * | |
1007 | * The other historical motiviation for highest->lowest was to improve the | |
1008 | * performance of memslot lookup. KVM originally used a linear search starting | |
1009 | * at memslots[0]. On x86, the largest memslot usually has one of the highest, | |
1010 | * if not *the* highest, GFN, as the bulk of the guest's RAM is located in a | |
1011 | * single memslot above the 4gb boundary. As the largest memslot is also the | |
1012 | * most likely to be referenced, sorting it to the front of the array was | |
1013 | * advantageous. The current binary search starts from the middle of the array | |
1014 | * and uses an LRU pointer to improve performance for all memslots and GFNs. | |
1015 | */ | |
1016 | static void update_memslots(struct kvm_memslots *slots, | |
1017 | struct kvm_memory_slot *memslot, | |
1018 | enum kvm_mr_change change) | |
1019 | { | |
1020 | int i; | |
1021 | ||
1022 | if (change == KVM_MR_DELETE) { | |
1023 | kvm_memslot_delete(slots, memslot); | |
1024 | } else { | |
1025 | if (change == KVM_MR_CREATE) | |
1026 | i = kvm_memslot_insert_back(slots); | |
1027 | else | |
1028 | i = kvm_memslot_move_backward(slots, memslot); | |
1029 | i = kvm_memslot_move_forward(slots, memslot, i); | |
1030 | ||
1031 | /* | |
1032 | * Copy the memslot to its new position in memslots and update | |
1033 | * its index accordingly. | |
1034 | */ | |
1035 | slots->memslots[i] = *memslot; | |
1036 | slots->id_to_index[memslot->id] = i; | |
1037 | } | |
bf3e05bc XG |
1038 | } |
1039 | ||
09170a49 | 1040 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 1041 | { |
4d8b81ab XG |
1042 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
1043 | ||
0f8a4de3 | 1044 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
1045 | valid_flags |= KVM_MEM_READONLY; |
1046 | #endif | |
1047 | ||
1048 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
1049 | return -EINVAL; |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
7ec4fb44 | 1054 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 1055 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 1056 | { |
f481b069 | 1057 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
361209e0 | 1058 | u64 gen = old_memslots->generation; |
7ec4fb44 | 1059 | |
361209e0 SC |
1060 | WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS); |
1061 | slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
ee3d1570 | 1062 | |
f481b069 | 1063 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 1064 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 1065 | |
ee3d1570 | 1066 | /* |
361209e0 | 1067 | * Increment the new memslot generation a second time, dropping the |
00116795 | 1068 | * update in-progress flag and incrementing the generation based on |
361209e0 SC |
1069 | * the number of address spaces. This provides a unique and easily |
1070 | * identifiable generation number while the memslots are in flux. | |
1071 | */ | |
1072 | gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
1073 | ||
1074 | /* | |
4bd518f1 PB |
1075 | * Generations must be unique even across address spaces. We do not need |
1076 | * a global counter for that, instead the generation space is evenly split | |
1077 | * across address spaces. For example, with two address spaces, address | |
164bf7e5 SC |
1078 | * space 0 will use generations 0, 2, 4, ... while address space 1 will |
1079 | * use generations 1, 3, 5, ... | |
ee3d1570 | 1080 | */ |
164bf7e5 | 1081 | gen += KVM_ADDRESS_SPACE_NUM; |
ee3d1570 | 1082 | |
15248258 | 1083 | kvm_arch_memslots_updated(kvm, gen); |
ee3d1570 | 1084 | |
15248258 | 1085 | slots->generation = gen; |
e59dbe09 TY |
1086 | |
1087 | return old_memslots; | |
7ec4fb44 GN |
1088 | } |
1089 | ||
36947254 SC |
1090 | /* |
1091 | * Note, at a minimum, the current number of used slots must be allocated, even | |
1092 | * when deleting a memslot, as we need a complete duplicate of the memslots for | |
1093 | * use when invalidating a memslot prior to deleting/moving the memslot. | |
1094 | */ | |
1095 | static struct kvm_memslots *kvm_dup_memslots(struct kvm_memslots *old, | |
1096 | enum kvm_mr_change change) | |
1097 | { | |
1098 | struct kvm_memslots *slots; | |
1099 | size_t old_size, new_size; | |
1100 | ||
1101 | old_size = sizeof(struct kvm_memslots) + | |
1102 | (sizeof(struct kvm_memory_slot) * old->used_slots); | |
1103 | ||
1104 | if (change == KVM_MR_CREATE) | |
1105 | new_size = old_size + sizeof(struct kvm_memory_slot); | |
1106 | else | |
1107 | new_size = old_size; | |
1108 | ||
1109 | slots = kvzalloc(new_size, GFP_KERNEL_ACCOUNT); | |
1110 | if (likely(slots)) | |
1111 | memcpy(slots, old, old_size); | |
1112 | ||
1113 | return slots; | |
1114 | } | |
1115 | ||
cf47f50b SC |
1116 | static int kvm_set_memslot(struct kvm *kvm, |
1117 | const struct kvm_userspace_memory_region *mem, | |
9d4c197c | 1118 | struct kvm_memory_slot *old, |
cf47f50b SC |
1119 | struct kvm_memory_slot *new, int as_id, |
1120 | enum kvm_mr_change change) | |
1121 | { | |
1122 | struct kvm_memory_slot *slot; | |
1123 | struct kvm_memslots *slots; | |
1124 | int r; | |
1125 | ||
36947254 | 1126 | slots = kvm_dup_memslots(__kvm_memslots(kvm, as_id), change); |
cf47f50b SC |
1127 | if (!slots) |
1128 | return -ENOMEM; | |
cf47f50b SC |
1129 | |
1130 | if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) { | |
1131 | /* | |
1132 | * Note, the INVALID flag needs to be in the appropriate entry | |
1133 | * in the freshly allocated memslots, not in @old or @new. | |
1134 | */ | |
1135 | slot = id_to_memslot(slots, old->id); | |
1136 | slot->flags |= KVM_MEMSLOT_INVALID; | |
1137 | ||
1138 | /* | |
1139 | * We can re-use the old memslots, the only difference from the | |
1140 | * newly installed memslots is the invalid flag, which will get | |
1141 | * dropped by update_memslots anyway. We'll also revert to the | |
1142 | * old memslots if preparing the new memory region fails. | |
1143 | */ | |
1144 | slots = install_new_memslots(kvm, as_id, slots); | |
1145 | ||
1146 | /* From this point no new shadow pages pointing to a deleted, | |
1147 | * or moved, memslot will be created. | |
1148 | * | |
1149 | * validation of sp->gfn happens in: | |
1150 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
1151 | * - kvm_is_visible_gfn (mmu_check_root) | |
1152 | */ | |
1153 | kvm_arch_flush_shadow_memslot(kvm, slot); | |
1154 | } | |
1155 | ||
1156 | r = kvm_arch_prepare_memory_region(kvm, new, mem, change); | |
1157 | if (r) | |
1158 | goto out_slots; | |
1159 | ||
1160 | update_memslots(slots, new, change); | |
1161 | slots = install_new_memslots(kvm, as_id, slots); | |
1162 | ||
1163 | kvm_arch_commit_memory_region(kvm, mem, old, new, change); | |
1164 | ||
1165 | kvfree(slots); | |
1166 | return 0; | |
1167 | ||
1168 | out_slots: | |
1169 | if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) | |
1170 | slots = install_new_memslots(kvm, as_id, slots); | |
1171 | kvfree(slots); | |
1172 | return r; | |
1173 | } | |
1174 | ||
5c0b4f3d SC |
1175 | static int kvm_delete_memslot(struct kvm *kvm, |
1176 | const struct kvm_userspace_memory_region *mem, | |
1177 | struct kvm_memory_slot *old, int as_id) | |
1178 | { | |
1179 | struct kvm_memory_slot new; | |
1180 | int r; | |
1181 | ||
1182 | if (!old->npages) | |
1183 | return -EINVAL; | |
1184 | ||
1185 | memset(&new, 0, sizeof(new)); | |
1186 | new.id = old->id; | |
1187 | ||
1188 | r = kvm_set_memslot(kvm, mem, old, &new, as_id, KVM_MR_DELETE); | |
1189 | if (r) | |
1190 | return r; | |
1191 | ||
e96c81ee | 1192 | kvm_free_memslot(kvm, old); |
5c0b4f3d SC |
1193 | return 0; |
1194 | } | |
1195 | ||
6aa8b732 AK |
1196 | /* |
1197 | * Allocate some memory and give it an address in the guest physical address | |
1198 | * space. | |
1199 | * | |
1200 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 1201 | * |
02d5d55b | 1202 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 1203 | */ |
f78e0e2e | 1204 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 1205 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 1206 | { |
6aa8b732 | 1207 | struct kvm_memory_slot old, new; |
163da372 | 1208 | struct kvm_memory_slot *tmp; |
f64c0398 | 1209 | enum kvm_mr_change change; |
163da372 SC |
1210 | int as_id, id; |
1211 | int r; | |
6aa8b732 | 1212 | |
a50d64d6 XG |
1213 | r = check_memory_region_flags(mem); |
1214 | if (r) | |
71a4c30b | 1215 | return r; |
a50d64d6 | 1216 | |
f481b069 PB |
1217 | as_id = mem->slot >> 16; |
1218 | id = (u16)mem->slot; | |
1219 | ||
6aa8b732 AK |
1220 | /* General sanity checks */ |
1221 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
71a4c30b | 1222 | return -EINVAL; |
6aa8b732 | 1223 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
71a4c30b | 1224 | return -EINVAL; |
fa3d315a | 1225 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 1226 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 1227 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
96d4f267 | 1228 | !access_ok((void __user *)(unsigned long)mem->userspace_addr, |
9e3bb6b6 | 1229 | mem->memory_size))) |
71a4c30b | 1230 | return -EINVAL; |
f481b069 | 1231 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
71a4c30b | 1232 | return -EINVAL; |
6aa8b732 | 1233 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
71a4c30b | 1234 | return -EINVAL; |
6aa8b732 | 1235 | |
5c0b4f3d SC |
1236 | /* |
1237 | * Make a full copy of the old memslot, the pointer will become stale | |
1238 | * when the memslots are re-sorted by update_memslots(), and the old | |
1239 | * memslot needs to be referenced after calling update_memslots(), e.g. | |
0dff0846 | 1240 | * to free its resources and for arch specific behavior. |
5c0b4f3d | 1241 | */ |
0577d1ab SC |
1242 | tmp = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
1243 | if (tmp) { | |
1244 | old = *tmp; | |
1245 | tmp = NULL; | |
1246 | } else { | |
1247 | memset(&old, 0, sizeof(old)); | |
1248 | old.id = id; | |
1249 | } | |
163da372 | 1250 | |
5c0b4f3d SC |
1251 | if (!mem->memory_size) |
1252 | return kvm_delete_memslot(kvm, mem, &old, as_id); | |
1253 | ||
f481b069 | 1254 | new.id = id; |
163da372 SC |
1255 | new.base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
1256 | new.npages = mem->memory_size >> PAGE_SHIFT; | |
6aa8b732 | 1257 | new.flags = mem->flags; |
414de7ab | 1258 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 1259 | |
163da372 SC |
1260 | if (new.npages > KVM_MEM_MAX_NR_PAGES) |
1261 | return -EINVAL; | |
1262 | ||
5c0b4f3d SC |
1263 | if (!old.npages) { |
1264 | change = KVM_MR_CREATE; | |
163da372 SC |
1265 | new.dirty_bitmap = NULL; |
1266 | memset(&new.arch, 0, sizeof(new.arch)); | |
5c0b4f3d SC |
1267 | } else { /* Modify an existing slot. */ |
1268 | if ((new.userspace_addr != old.userspace_addr) || | |
163da372 | 1269 | (new.npages != old.npages) || |
5c0b4f3d | 1270 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) |
71a4c30b | 1271 | return -EINVAL; |
09170a49 | 1272 | |
163da372 | 1273 | if (new.base_gfn != old.base_gfn) |
5c0b4f3d SC |
1274 | change = KVM_MR_MOVE; |
1275 | else if (new.flags != old.flags) | |
1276 | change = KVM_MR_FLAGS_ONLY; | |
1277 | else /* Nothing to change. */ | |
1278 | return 0; | |
163da372 SC |
1279 | |
1280 | /* Copy dirty_bitmap and arch from the current memslot. */ | |
1281 | new.dirty_bitmap = old.dirty_bitmap; | |
1282 | memcpy(&new.arch, &old.arch, sizeof(new.arch)); | |
09170a49 | 1283 | } |
6aa8b732 | 1284 | |
f64c0398 | 1285 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee | 1286 | /* Check for overlaps */ |
163da372 SC |
1287 | kvm_for_each_memslot(tmp, __kvm_memslots(kvm, as_id)) { |
1288 | if (tmp->id == id) | |
0a706bee | 1289 | continue; |
163da372 SC |
1290 | if (!((new.base_gfn + new.npages <= tmp->base_gfn) || |
1291 | (new.base_gfn >= tmp->base_gfn + tmp->npages))) | |
71a4c30b | 1292 | return -EEXIST; |
0a706bee | 1293 | } |
6aa8b732 | 1294 | } |
6aa8b732 | 1295 | |
414de7ab SC |
1296 | /* Allocate/free page dirty bitmap as needed */ |
1297 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
1298 | new.dirty_bitmap = NULL; | |
1299 | else if (!new.dirty_bitmap) { | |
3c9bd400 | 1300 | r = kvm_alloc_dirty_bitmap(&new); |
71a4c30b SC |
1301 | if (r) |
1302 | return r; | |
3c9bd400 JZ |
1303 | |
1304 | if (kvm_dirty_log_manual_protect_and_init_set(kvm)) | |
1305 | bitmap_set(new.dirty_bitmap, 0, new.npages); | |
6aa8b732 AK |
1306 | } |
1307 | ||
cf47f50b SC |
1308 | r = kvm_set_memslot(kvm, mem, &old, &new, as_id, change); |
1309 | if (r) | |
1310 | goto out_bitmap; | |
82ce2c96 | 1311 | |
5c0b4f3d SC |
1312 | if (old.dirty_bitmap && !new.dirty_bitmap) |
1313 | kvm_destroy_dirty_bitmap(&old); | |
6aa8b732 AK |
1314 | return 0; |
1315 | ||
bd0e96fd SC |
1316 | out_bitmap: |
1317 | if (new.dirty_bitmap && !old.dirty_bitmap) | |
1318 | kvm_destroy_dirty_bitmap(&new); | |
6aa8b732 | 1319 | return r; |
210c7c4d | 1320 | } |
f78e0e2e SY |
1321 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1322 | ||
1323 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1324 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1325 | { |
1326 | int r; | |
1327 | ||
79fac95e | 1328 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1329 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1330 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1331 | return r; |
1332 | } | |
210c7c4d IE |
1333 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1334 | ||
7940876e SH |
1335 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1336 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1337 | { |
f481b069 | 1338 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1339 | return -EINVAL; |
09170a49 | 1340 | |
47ae31e2 | 1341 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1342 | } |
1343 | ||
0dff0846 | 1344 | #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
2a49f61d SC |
1345 | /** |
1346 | * kvm_get_dirty_log - get a snapshot of dirty pages | |
1347 | * @kvm: pointer to kvm instance | |
1348 | * @log: slot id and address to which we copy the log | |
1349 | * @is_dirty: set to '1' if any dirty pages were found | |
1350 | * @memslot: set to the associated memslot, always valid on success | |
1351 | */ | |
1352 | int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, | |
1353 | int *is_dirty, struct kvm_memory_slot **memslot) | |
6aa8b732 | 1354 | { |
9f6b8029 | 1355 | struct kvm_memslots *slots; |
843574a3 | 1356 | int i, as_id, id; |
87bf6e7d | 1357 | unsigned long n; |
6aa8b732 AK |
1358 | unsigned long any = 0; |
1359 | ||
2a49f61d SC |
1360 | *memslot = NULL; |
1361 | *is_dirty = 0; | |
1362 | ||
f481b069 PB |
1363 | as_id = log->slot >> 16; |
1364 | id = (u16)log->slot; | |
1365 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1366 | return -EINVAL; |
6aa8b732 | 1367 | |
f481b069 | 1368 | slots = __kvm_memslots(kvm, as_id); |
2a49f61d | 1369 | *memslot = id_to_memslot(slots, id); |
0577d1ab | 1370 | if (!(*memslot) || !(*memslot)->dirty_bitmap) |
843574a3 | 1371 | return -ENOENT; |
6aa8b732 | 1372 | |
2a49f61d SC |
1373 | kvm_arch_sync_dirty_log(kvm, *memslot); |
1374 | ||
1375 | n = kvm_dirty_bitmap_bytes(*memslot); | |
6aa8b732 | 1376 | |
cd1a4a98 | 1377 | for (i = 0; !any && i < n/sizeof(long); ++i) |
2a49f61d | 1378 | any = (*memslot)->dirty_bitmap[i]; |
6aa8b732 | 1379 | |
2a49f61d | 1380 | if (copy_to_user(log->dirty_bitmap, (*memslot)->dirty_bitmap, n)) |
843574a3 | 1381 | return -EFAULT; |
6aa8b732 | 1382 | |
5bb064dc ZX |
1383 | if (any) |
1384 | *is_dirty = 1; | |
843574a3 | 1385 | return 0; |
6aa8b732 | 1386 | } |
2ba9f0d8 | 1387 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1388 | |
0dff0846 | 1389 | #else /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */ |
ba0513b5 | 1390 | /** |
b8b00220 | 1391 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages |
2a31b9db | 1392 | * and reenable dirty page tracking for the corresponding pages. |
ba0513b5 MS |
1393 | * @kvm: pointer to kvm instance |
1394 | * @log: slot id and address to which we copy the log | |
ba0513b5 MS |
1395 | * |
1396 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1397 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1398 | * following order: | |
1399 | * | |
1400 | * 1. Take a snapshot of the bit and clear it if needed. | |
1401 | * 2. Write protect the corresponding page. | |
1402 | * 3. Copy the snapshot to the userspace. | |
1403 | * 4. Upon return caller flushes TLB's if needed. | |
1404 | * | |
1405 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1406 | * entry. This is not a problem because the page is reported dirty using | |
1407 | * the snapshot taken before and step 4 ensures that writes done after | |
1408 | * exiting to userspace will be logged for the next call. | |
1409 | * | |
1410 | */ | |
0dff0846 | 1411 | static int kvm_get_dirty_log_protect(struct kvm *kvm, struct kvm_dirty_log *log) |
ba0513b5 | 1412 | { |
9f6b8029 | 1413 | struct kvm_memslots *slots; |
ba0513b5 | 1414 | struct kvm_memory_slot *memslot; |
58d6db34 | 1415 | int i, as_id, id; |
ba0513b5 MS |
1416 | unsigned long n; |
1417 | unsigned long *dirty_bitmap; | |
1418 | unsigned long *dirty_bitmap_buffer; | |
0dff0846 | 1419 | bool flush; |
ba0513b5 | 1420 | |
f481b069 PB |
1421 | as_id = log->slot >> 16; |
1422 | id = (u16)log->slot; | |
1423 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1424 | return -EINVAL; |
ba0513b5 | 1425 | |
f481b069 PB |
1426 | slots = __kvm_memslots(kvm, as_id); |
1427 | memslot = id_to_memslot(slots, id); | |
0577d1ab SC |
1428 | if (!memslot || !memslot->dirty_bitmap) |
1429 | return -ENOENT; | |
ba0513b5 MS |
1430 | |
1431 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1432 | |
0dff0846 SC |
1433 | kvm_arch_sync_dirty_log(kvm, memslot); |
1434 | ||
ba0513b5 | 1435 | n = kvm_dirty_bitmap_bytes(memslot); |
0dff0846 | 1436 | flush = false; |
2a31b9db PB |
1437 | if (kvm->manual_dirty_log_protect) { |
1438 | /* | |
1439 | * Unlike kvm_get_dirty_log, we always return false in *flush, | |
1440 | * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There | |
1441 | * is some code duplication between this function and | |
1442 | * kvm_get_dirty_log, but hopefully all architecture | |
1443 | * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log | |
1444 | * can be eliminated. | |
1445 | */ | |
1446 | dirty_bitmap_buffer = dirty_bitmap; | |
1447 | } else { | |
1448 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); | |
1449 | memset(dirty_bitmap_buffer, 0, n); | |
ba0513b5 | 1450 | |
2a31b9db PB |
1451 | spin_lock(&kvm->mmu_lock); |
1452 | for (i = 0; i < n / sizeof(long); i++) { | |
1453 | unsigned long mask; | |
1454 | gfn_t offset; | |
ba0513b5 | 1455 | |
2a31b9db PB |
1456 | if (!dirty_bitmap[i]) |
1457 | continue; | |
1458 | ||
0dff0846 | 1459 | flush = true; |
2a31b9db PB |
1460 | mask = xchg(&dirty_bitmap[i], 0); |
1461 | dirty_bitmap_buffer[i] = mask; | |
1462 | ||
a67794ca LT |
1463 | offset = i * BITS_PER_LONG; |
1464 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1465 | offset, mask); | |
2a31b9db PB |
1466 | } |
1467 | spin_unlock(&kvm->mmu_lock); | |
1468 | } | |
1469 | ||
0dff0846 SC |
1470 | if (flush) |
1471 | kvm_arch_flush_remote_tlbs_memslot(kvm, memslot); | |
1472 | ||
2a31b9db PB |
1473 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) |
1474 | return -EFAULT; | |
1475 | return 0; | |
1476 | } | |
0dff0846 SC |
1477 | |
1478 | ||
1479 | /** | |
1480 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
1481 | * @kvm: kvm instance | |
1482 | * @log: slot id and address to which we copy the log | |
1483 | * | |
1484 | * Steps 1-4 below provide general overview of dirty page logging. See | |
1485 | * kvm_get_dirty_log_protect() function description for additional details. | |
1486 | * | |
1487 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
1488 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
1489 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
1490 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
1491 | * writes will be marked dirty for next log read. | |
1492 | * | |
1493 | * 1. Take a snapshot of the bit and clear it if needed. | |
1494 | * 2. Write protect the corresponding page. | |
1495 | * 3. Copy the snapshot to the userspace. | |
1496 | * 4. Flush TLB's if needed. | |
1497 | */ | |
1498 | static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, | |
1499 | struct kvm_dirty_log *log) | |
1500 | { | |
1501 | int r; | |
1502 | ||
1503 | mutex_lock(&kvm->slots_lock); | |
1504 | ||
1505 | r = kvm_get_dirty_log_protect(kvm, log); | |
1506 | ||
1507 | mutex_unlock(&kvm->slots_lock); | |
1508 | return r; | |
1509 | } | |
2a31b9db PB |
1510 | |
1511 | /** | |
1512 | * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap | |
1513 | * and reenable dirty page tracking for the corresponding pages. | |
1514 | * @kvm: pointer to kvm instance | |
1515 | * @log: slot id and address from which to fetch the bitmap of dirty pages | |
1516 | */ | |
0dff0846 SC |
1517 | static int kvm_clear_dirty_log_protect(struct kvm *kvm, |
1518 | struct kvm_clear_dirty_log *log) | |
2a31b9db PB |
1519 | { |
1520 | struct kvm_memslots *slots; | |
1521 | struct kvm_memory_slot *memslot; | |
98938aa8 | 1522 | int as_id, id; |
2a31b9db | 1523 | gfn_t offset; |
98938aa8 | 1524 | unsigned long i, n; |
2a31b9db PB |
1525 | unsigned long *dirty_bitmap; |
1526 | unsigned long *dirty_bitmap_buffer; | |
0dff0846 | 1527 | bool flush; |
2a31b9db PB |
1528 | |
1529 | as_id = log->slot >> 16; | |
1530 | id = (u16)log->slot; | |
1531 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1532 | return -EINVAL; | |
1533 | ||
76d58e0f | 1534 | if (log->first_page & 63) |
2a31b9db PB |
1535 | return -EINVAL; |
1536 | ||
1537 | slots = __kvm_memslots(kvm, as_id); | |
1538 | memslot = id_to_memslot(slots, id); | |
0577d1ab SC |
1539 | if (!memslot || !memslot->dirty_bitmap) |
1540 | return -ENOENT; | |
2a31b9db PB |
1541 | |
1542 | dirty_bitmap = memslot->dirty_bitmap; | |
2a31b9db | 1543 | |
4ddc9204 | 1544 | n = ALIGN(log->num_pages, BITS_PER_LONG) / 8; |
98938aa8 TB |
1545 | |
1546 | if (log->first_page > memslot->npages || | |
76d58e0f PB |
1547 | log->num_pages > memslot->npages - log->first_page || |
1548 | (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63))) | |
1549 | return -EINVAL; | |
98938aa8 | 1550 | |
0dff0846 SC |
1551 | kvm_arch_sync_dirty_log(kvm, memslot); |
1552 | ||
1553 | flush = false; | |
2a31b9db PB |
1554 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
1555 | if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n)) | |
1556 | return -EFAULT; | |
ba0513b5 | 1557 | |
2a31b9db | 1558 | spin_lock(&kvm->mmu_lock); |
53eac7a8 PX |
1559 | for (offset = log->first_page, i = offset / BITS_PER_LONG, |
1560 | n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--; | |
2a31b9db PB |
1561 | i++, offset += BITS_PER_LONG) { |
1562 | unsigned long mask = *dirty_bitmap_buffer++; | |
1563 | atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i]; | |
1564 | if (!mask) | |
ba0513b5 MS |
1565 | continue; |
1566 | ||
2a31b9db | 1567 | mask &= atomic_long_fetch_andnot(mask, p); |
ba0513b5 | 1568 | |
2a31b9db PB |
1569 | /* |
1570 | * mask contains the bits that really have been cleared. This | |
1571 | * never includes any bits beyond the length of the memslot (if | |
1572 | * the length is not aligned to 64 pages), therefore it is not | |
1573 | * a problem if userspace sets them in log->dirty_bitmap. | |
1574 | */ | |
58d2930f | 1575 | if (mask) { |
0dff0846 | 1576 | flush = true; |
58d2930f TY |
1577 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
1578 | offset, mask); | |
1579 | } | |
ba0513b5 | 1580 | } |
ba0513b5 | 1581 | spin_unlock(&kvm->mmu_lock); |
2a31b9db | 1582 | |
0dff0846 SC |
1583 | if (flush) |
1584 | kvm_arch_flush_remote_tlbs_memslot(kvm, memslot); | |
1585 | ||
58d6db34 | 1586 | return 0; |
ba0513b5 | 1587 | } |
0dff0846 SC |
1588 | |
1589 | static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, | |
1590 | struct kvm_clear_dirty_log *log) | |
1591 | { | |
1592 | int r; | |
1593 | ||
1594 | mutex_lock(&kvm->slots_lock); | |
1595 | ||
1596 | r = kvm_clear_dirty_log_protect(kvm, log); | |
1597 | ||
1598 | mutex_unlock(&kvm->slots_lock); | |
1599 | return r; | |
1600 | } | |
1601 | #endif /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */ | |
ba0513b5 | 1602 | |
49c7754c GN |
1603 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1604 | { | |
1605 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1606 | } | |
a1f4d395 | 1607 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1608 | |
8e73485c PB |
1609 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1610 | { | |
1611 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1612 | } | |
1613 | ||
33e94154 | 1614 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 1615 | { |
bf3e05bc | 1616 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1617 | |
bbacc0c1 | 1618 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc | 1619 | memslot->flags & KVM_MEMSLOT_INVALID) |
33e94154 | 1620 | return false; |
e0d62c7f | 1621 | |
33e94154 | 1622 | return true; |
e0d62c7f IE |
1623 | } |
1624 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1625 | ||
f9b84e19 | 1626 | unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) |
8f0b1ab6 JR |
1627 | { |
1628 | struct vm_area_struct *vma; | |
1629 | unsigned long addr, size; | |
1630 | ||
1631 | size = PAGE_SIZE; | |
1632 | ||
42cde48b | 1633 | addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL); |
8f0b1ab6 JR |
1634 | if (kvm_is_error_hva(addr)) |
1635 | return PAGE_SIZE; | |
1636 | ||
1637 | down_read(¤t->mm->mmap_sem); | |
1638 | vma = find_vma(current->mm, addr); | |
1639 | if (!vma) | |
1640 | goto out; | |
1641 | ||
1642 | size = vma_kernel_pagesize(vma); | |
1643 | ||
1644 | out: | |
1645 | up_read(¤t->mm->mmap_sem); | |
1646 | ||
1647 | return size; | |
1648 | } | |
1649 | ||
4d8b81ab XG |
1650 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1651 | { | |
1652 | return slot->flags & KVM_MEM_READONLY; | |
1653 | } | |
1654 | ||
4d8b81ab XG |
1655 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1656 | gfn_t *nr_pages, bool write) | |
539cb660 | 1657 | { |
bc6678a3 | 1658 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1659 | return KVM_HVA_ERR_BAD; |
48987781 | 1660 | |
4d8b81ab XG |
1661 | if (memslot_is_readonly(slot) && write) |
1662 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1663 | |
1664 | if (nr_pages) | |
1665 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1666 | ||
4d8b81ab | 1667 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1668 | } |
48987781 | 1669 | |
4d8b81ab XG |
1670 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1671 | gfn_t *nr_pages) | |
1672 | { | |
1673 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1674 | } |
48987781 | 1675 | |
4d8b81ab | 1676 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1677 | gfn_t gfn) |
4d8b81ab XG |
1678 | { |
1679 | return gfn_to_hva_many(slot, gfn, NULL); | |
1680 | } | |
1681 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1682 | ||
48987781 XG |
1683 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1684 | { | |
49c7754c | 1685 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1686 | } |
0d150298 | 1687 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1688 | |
8e73485c PB |
1689 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1690 | { | |
1691 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1692 | } | |
1693 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1694 | ||
86ab8cff | 1695 | /* |
970c0d4b WY |
1696 | * Return the hva of a @gfn and the R/W attribute if possible. |
1697 | * | |
1698 | * @slot: the kvm_memory_slot which contains @gfn | |
1699 | * @gfn: the gfn to be translated | |
1700 | * @writable: used to return the read/write attribute of the @slot if the hva | |
1701 | * is valid and @writable is not NULL | |
86ab8cff | 1702 | */ |
64d83126 CD |
1703 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1704 | gfn_t gfn, bool *writable) | |
86ab8cff | 1705 | { |
a2ac07fe GN |
1706 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1707 | ||
1708 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1709 | *writable = !memslot_is_readonly(slot); |
1710 | ||
a2ac07fe | 1711 | return hva; |
86ab8cff XG |
1712 | } |
1713 | ||
64d83126 CD |
1714 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1715 | { | |
1716 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1717 | ||
1718 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1719 | } | |
1720 | ||
8e73485c PB |
1721 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1722 | { | |
1723 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1724 | ||
1725 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1726 | } | |
1727 | ||
fafc3dba HY |
1728 | static inline int check_user_page_hwpoison(unsigned long addr) |
1729 | { | |
0d731759 | 1730 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 1731 | |
0d731759 | 1732 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
1733 | return rc == -EHWPOISON; |
1734 | } | |
1735 | ||
2fc84311 | 1736 | /* |
b9b33da2 PB |
1737 | * The fast path to get the writable pfn which will be stored in @pfn, |
1738 | * true indicates success, otherwise false is returned. It's also the | |
311497e0 | 1739 | * only part that runs if we can in atomic context. |
2fc84311 | 1740 | */ |
b9b33da2 PB |
1741 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
1742 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 1743 | { |
8d4e1288 | 1744 | struct page *page[1]; |
2fc84311 | 1745 | int npages; |
954bbbc2 | 1746 | |
12ce13fe XG |
1747 | /* |
1748 | * Fast pin a writable pfn only if it is a write fault request | |
1749 | * or the caller allows to map a writable pfn for a read fault | |
1750 | * request. | |
1751 | */ | |
1752 | if (!(write_fault || writable)) | |
1753 | return false; | |
612819c3 | 1754 | |
2fc84311 XG |
1755 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1756 | if (npages == 1) { | |
1757 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1758 | |
2fc84311 XG |
1759 | if (writable) |
1760 | *writable = true; | |
1761 | return true; | |
1762 | } | |
af585b92 | 1763 | |
2fc84311 XG |
1764 | return false; |
1765 | } | |
612819c3 | 1766 | |
2fc84311 XG |
1767 | /* |
1768 | * The slow path to get the pfn of the specified host virtual address, | |
1769 | * 1 indicates success, -errno is returned if error is detected. | |
1770 | */ | |
1771 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 1772 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 1773 | { |
ce53053c AV |
1774 | unsigned int flags = FOLL_HWPOISON; |
1775 | struct page *page; | |
2fc84311 | 1776 | int npages = 0; |
612819c3 | 1777 | |
2fc84311 XG |
1778 | might_sleep(); |
1779 | ||
1780 | if (writable) | |
1781 | *writable = write_fault; | |
1782 | ||
ce53053c AV |
1783 | if (write_fault) |
1784 | flags |= FOLL_WRITE; | |
1785 | if (async) | |
1786 | flags |= FOLL_NOWAIT; | |
d4944b0e | 1787 | |
ce53053c | 1788 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
1789 | if (npages != 1) |
1790 | return npages; | |
1791 | ||
1792 | /* map read fault as writable if possible */ | |
12ce13fe | 1793 | if (unlikely(!write_fault) && writable) { |
ce53053c | 1794 | struct page *wpage; |
2fc84311 | 1795 | |
ce53053c | 1796 | if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { |
2fc84311 | 1797 | *writable = true; |
ce53053c AV |
1798 | put_page(page); |
1799 | page = wpage; | |
612819c3 | 1800 | } |
887c08ac | 1801 | } |
ce53053c | 1802 | *pfn = page_to_pfn(page); |
2fc84311 XG |
1803 | return npages; |
1804 | } | |
539cb660 | 1805 | |
4d8b81ab XG |
1806 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1807 | { | |
1808 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1809 | return false; | |
2e2e3738 | 1810 | |
4d8b81ab XG |
1811 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1812 | return false; | |
887c08ac | 1813 | |
4d8b81ab XG |
1814 | return true; |
1815 | } | |
bf998156 | 1816 | |
92176a8e PB |
1817 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
1818 | unsigned long addr, bool *async, | |
a340b3e2 KA |
1819 | bool write_fault, bool *writable, |
1820 | kvm_pfn_t *p_pfn) | |
92176a8e | 1821 | { |
add6a0cd PB |
1822 | unsigned long pfn; |
1823 | int r; | |
1824 | ||
1825 | r = follow_pfn(vma, addr, &pfn); | |
1826 | if (r) { | |
1827 | /* | |
1828 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1829 | * not call the fault handler, so do it here. | |
1830 | */ | |
1831 | bool unlocked = false; | |
1832 | r = fixup_user_fault(current, current->mm, addr, | |
1833 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1834 | &unlocked); | |
1835 | if (unlocked) | |
1836 | return -EAGAIN; | |
1837 | if (r) | |
1838 | return r; | |
1839 | ||
1840 | r = follow_pfn(vma, addr, &pfn); | |
1841 | if (r) | |
1842 | return r; | |
1843 | ||
1844 | } | |
1845 | ||
a340b3e2 KA |
1846 | if (writable) |
1847 | *writable = true; | |
add6a0cd PB |
1848 | |
1849 | /* | |
1850 | * Get a reference here because callers of *hva_to_pfn* and | |
1851 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1852 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1853 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1854 | * simply do nothing for reserved pfns. | |
1855 | * | |
1856 | * Whoever called remap_pfn_range is also going to call e.g. | |
1857 | * unmap_mapping_range before the underlying pages are freed, | |
1858 | * causing a call to our MMU notifier. | |
1859 | */ | |
1860 | kvm_get_pfn(pfn); | |
1861 | ||
1862 | *p_pfn = pfn; | |
92176a8e PB |
1863 | return 0; |
1864 | } | |
1865 | ||
12ce13fe XG |
1866 | /* |
1867 | * Pin guest page in memory and return its pfn. | |
1868 | * @addr: host virtual address which maps memory to the guest | |
1869 | * @atomic: whether this function can sleep | |
1870 | * @async: whether this function need to wait IO complete if the | |
1871 | * host page is not in the memory | |
1872 | * @write_fault: whether we should get a writable host page | |
1873 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1874 | * | |
1875 | * The function will map a writable host page for these two cases: | |
1876 | * 1): @write_fault = true | |
1877 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1878 | * whether the mapping is writable. | |
1879 | */ | |
ba049e93 | 1880 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
1881 | bool write_fault, bool *writable) |
1882 | { | |
1883 | struct vm_area_struct *vma; | |
ba049e93 | 1884 | kvm_pfn_t pfn = 0; |
92176a8e | 1885 | int npages, r; |
2e2e3738 | 1886 | |
2fc84311 XG |
1887 | /* we can do it either atomically or asynchronously, not both */ |
1888 | BUG_ON(atomic && async); | |
8d4e1288 | 1889 | |
b9b33da2 | 1890 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
1891 | return pfn; |
1892 | ||
1893 | if (atomic) | |
1894 | return KVM_PFN_ERR_FAULT; | |
1895 | ||
1896 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1897 | if (npages == 1) | |
1898 | return pfn; | |
8d4e1288 | 1899 | |
2fc84311 XG |
1900 | down_read(¤t->mm->mmap_sem); |
1901 | if (npages == -EHWPOISON || | |
1902 | (!async && check_user_page_hwpoison(addr))) { | |
1903 | pfn = KVM_PFN_ERR_HWPOISON; | |
1904 | goto exit; | |
1905 | } | |
1906 | ||
add6a0cd | 1907 | retry: |
2fc84311 XG |
1908 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
1909 | ||
1910 | if (vma == NULL) | |
1911 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 1912 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 1913 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
add6a0cd PB |
1914 | if (r == -EAGAIN) |
1915 | goto retry; | |
92176a8e PB |
1916 | if (r < 0) |
1917 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 1918 | } else { |
4d8b81ab | 1919 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1920 | *async = true; |
1921 | pfn = KVM_PFN_ERR_FAULT; | |
1922 | } | |
1923 | exit: | |
1924 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1925 | return pfn; |
35149e21 AL |
1926 | } |
1927 | ||
ba049e93 DW |
1928 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
1929 | bool atomic, bool *async, bool write_fault, | |
1930 | bool *writable) | |
887c08ac | 1931 | { |
4d8b81ab XG |
1932 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1933 | ||
b2740d35 PB |
1934 | if (addr == KVM_HVA_ERR_RO_BAD) { |
1935 | if (writable) | |
1936 | *writable = false; | |
4d8b81ab | 1937 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 1938 | } |
4d8b81ab | 1939 | |
b2740d35 PB |
1940 | if (kvm_is_error_hva(addr)) { |
1941 | if (writable) | |
1942 | *writable = false; | |
81c52c56 | 1943 | return KVM_PFN_NOSLOT; |
b2740d35 | 1944 | } |
4d8b81ab XG |
1945 | |
1946 | /* Do not map writable pfn in the readonly memslot. */ | |
1947 | if (writable && memslot_is_readonly(slot)) { | |
1948 | *writable = false; | |
1949 | writable = NULL; | |
1950 | } | |
1951 | ||
1952 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1953 | writable); | |
887c08ac | 1954 | } |
3520469d | 1955 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1956 | |
ba049e93 | 1957 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
1958 | bool *writable) |
1959 | { | |
e37afc6e PB |
1960 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1961 | write_fault, writable); | |
612819c3 MT |
1962 | } |
1963 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1964 | ||
ba049e93 | 1965 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1966 | { |
4d8b81ab | 1967 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1968 | } |
e37afc6e | 1969 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1970 | |
ba049e93 | 1971 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1972 | { |
4d8b81ab | 1973 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1974 | } |
037d92dc | 1975 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1976 | |
ba049e93 | 1977 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1978 | { |
1979 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1980 | } | |
1981 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1982 | ||
ba049e93 | 1983 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1984 | { |
1985 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1986 | } | |
1987 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1988 | ||
ba049e93 | 1989 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1990 | { |
1991 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1992 | } | |
1993 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1994 | ||
d9ef13c2 PB |
1995 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1996 | struct page **pages, int nr_pages) | |
48987781 XG |
1997 | { |
1998 | unsigned long addr; | |
076b925d | 1999 | gfn_t entry = 0; |
48987781 | 2000 | |
d9ef13c2 | 2001 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
2002 | if (kvm_is_error_hva(addr)) |
2003 | return -1; | |
2004 | ||
2005 | if (entry < nr_pages) | |
2006 | return 0; | |
2007 | ||
2008 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
2011 | ||
ba049e93 | 2012 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 2013 | { |
81c52c56 | 2014 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 2015 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 2016 | |
bf4bea8e | 2017 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 2018 | WARN_ON(1); |
6cede2e6 | 2019 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 2020 | } |
a2766325 XG |
2021 | |
2022 | return pfn_to_page(pfn); | |
2023 | } | |
2024 | ||
35149e21 AL |
2025 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
2026 | { | |
ba049e93 | 2027 | kvm_pfn_t pfn; |
2e2e3738 AL |
2028 | |
2029 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 2030 | |
a2766325 | 2031 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
2032 | } |
2033 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
2034 | ||
91724814 BO |
2035 | void kvm_release_pfn(kvm_pfn_t pfn, bool dirty, struct gfn_to_pfn_cache *cache) |
2036 | { | |
2037 | if (pfn == 0) | |
2038 | return; | |
2039 | ||
2040 | if (cache) | |
2041 | cache->pfn = cache->gfn = 0; | |
2042 | ||
2043 | if (dirty) | |
2044 | kvm_release_pfn_dirty(pfn); | |
2045 | else | |
2046 | kvm_release_pfn_clean(pfn); | |
2047 | } | |
2048 | ||
2049 | static void kvm_cache_gfn_to_pfn(struct kvm_memory_slot *slot, gfn_t gfn, | |
2050 | struct gfn_to_pfn_cache *cache, u64 gen) | |
2051 | { | |
2052 | kvm_release_pfn(cache->pfn, cache->dirty, cache); | |
2053 | ||
2054 | cache->pfn = gfn_to_pfn_memslot(slot, gfn); | |
2055 | cache->gfn = gfn; | |
2056 | cache->dirty = false; | |
2057 | cache->generation = gen; | |
2058 | } | |
2059 | ||
1eff70a9 | 2060 | static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn, |
91724814 BO |
2061 | struct kvm_host_map *map, |
2062 | struct gfn_to_pfn_cache *cache, | |
2063 | bool atomic) | |
e45adf66 KA |
2064 | { |
2065 | kvm_pfn_t pfn; | |
2066 | void *hva = NULL; | |
2067 | struct page *page = KVM_UNMAPPED_PAGE; | |
1eff70a9 | 2068 | struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn); |
91724814 | 2069 | u64 gen = slots->generation; |
e45adf66 KA |
2070 | |
2071 | if (!map) | |
2072 | return -EINVAL; | |
2073 | ||
91724814 BO |
2074 | if (cache) { |
2075 | if (!cache->pfn || cache->gfn != gfn || | |
2076 | cache->generation != gen) { | |
2077 | if (atomic) | |
2078 | return -EAGAIN; | |
2079 | kvm_cache_gfn_to_pfn(slot, gfn, cache, gen); | |
2080 | } | |
2081 | pfn = cache->pfn; | |
2082 | } else { | |
2083 | if (atomic) | |
2084 | return -EAGAIN; | |
2085 | pfn = gfn_to_pfn_memslot(slot, gfn); | |
2086 | } | |
e45adf66 KA |
2087 | if (is_error_noslot_pfn(pfn)) |
2088 | return -EINVAL; | |
2089 | ||
2090 | if (pfn_valid(pfn)) { | |
2091 | page = pfn_to_page(pfn); | |
91724814 BO |
2092 | if (atomic) |
2093 | hva = kmap_atomic(page); | |
2094 | else | |
2095 | hva = kmap(page); | |
d30b214d | 2096 | #ifdef CONFIG_HAS_IOMEM |
91724814 | 2097 | } else if (!atomic) { |
e45adf66 | 2098 | hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB); |
91724814 BO |
2099 | } else { |
2100 | return -EINVAL; | |
d30b214d | 2101 | #endif |
e45adf66 KA |
2102 | } |
2103 | ||
2104 | if (!hva) | |
2105 | return -EFAULT; | |
2106 | ||
2107 | map->page = page; | |
2108 | map->hva = hva; | |
2109 | map->pfn = pfn; | |
2110 | map->gfn = gfn; | |
2111 | ||
2112 | return 0; | |
2113 | } | |
2114 | ||
91724814 BO |
2115 | int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map, |
2116 | struct gfn_to_pfn_cache *cache, bool atomic) | |
1eff70a9 | 2117 | { |
91724814 BO |
2118 | return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map, |
2119 | cache, atomic); | |
1eff70a9 BO |
2120 | } |
2121 | EXPORT_SYMBOL_GPL(kvm_map_gfn); | |
2122 | ||
e45adf66 KA |
2123 | int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) |
2124 | { | |
91724814 BO |
2125 | return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map, |
2126 | NULL, false); | |
e45adf66 KA |
2127 | } |
2128 | EXPORT_SYMBOL_GPL(kvm_vcpu_map); | |
2129 | ||
1eff70a9 | 2130 | static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot, |
91724814 BO |
2131 | struct kvm_host_map *map, |
2132 | struct gfn_to_pfn_cache *cache, | |
2133 | bool dirty, bool atomic) | |
e45adf66 KA |
2134 | { |
2135 | if (!map) | |
2136 | return; | |
2137 | ||
2138 | if (!map->hva) | |
2139 | return; | |
2140 | ||
91724814 BO |
2141 | if (map->page != KVM_UNMAPPED_PAGE) { |
2142 | if (atomic) | |
2143 | kunmap_atomic(map->hva); | |
2144 | else | |
2145 | kunmap(map->page); | |
2146 | } | |
eb1f2f38 | 2147 | #ifdef CONFIG_HAS_IOMEM |
91724814 | 2148 | else if (!atomic) |
e45adf66 | 2149 | memunmap(map->hva); |
91724814 BO |
2150 | else |
2151 | WARN_ONCE(1, "Unexpected unmapping in atomic context"); | |
eb1f2f38 | 2152 | #endif |
e45adf66 | 2153 | |
91724814 | 2154 | if (dirty) |
1eff70a9 | 2155 | mark_page_dirty_in_slot(memslot, map->gfn); |
91724814 BO |
2156 | |
2157 | if (cache) | |
2158 | cache->dirty |= dirty; | |
2159 | else | |
2160 | kvm_release_pfn(map->pfn, dirty, NULL); | |
e45adf66 KA |
2161 | |
2162 | map->hva = NULL; | |
2163 | map->page = NULL; | |
2164 | } | |
1eff70a9 | 2165 | |
91724814 BO |
2166 | int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, |
2167 | struct gfn_to_pfn_cache *cache, bool dirty, bool atomic) | |
1eff70a9 | 2168 | { |
91724814 BO |
2169 | __kvm_unmap_gfn(gfn_to_memslot(vcpu->kvm, map->gfn), map, |
2170 | cache, dirty, atomic); | |
1eff70a9 BO |
2171 | return 0; |
2172 | } | |
2173 | EXPORT_SYMBOL_GPL(kvm_unmap_gfn); | |
2174 | ||
2175 | void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty) | |
2176 | { | |
91724814 BO |
2177 | __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), map, NULL, |
2178 | dirty, false); | |
1eff70a9 | 2179 | } |
e45adf66 KA |
2180 | EXPORT_SYMBOL_GPL(kvm_vcpu_unmap); |
2181 | ||
8e73485c PB |
2182 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
2183 | { | |
ba049e93 | 2184 | kvm_pfn_t pfn; |
8e73485c PB |
2185 | |
2186 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
2187 | ||
2188 | return kvm_pfn_to_page(pfn); | |
2189 | } | |
2190 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
2191 | ||
b4231d61 IE |
2192 | void kvm_release_page_clean(struct page *page) |
2193 | { | |
32cad84f XG |
2194 | WARN_ON(is_error_page(page)); |
2195 | ||
35149e21 | 2196 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
2197 | } |
2198 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
2199 | ||
ba049e93 | 2200 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 2201 | { |
bf4bea8e | 2202 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 2203 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
2204 | } |
2205 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
2206 | ||
b4231d61 | 2207 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 2208 | { |
a2766325 XG |
2209 | WARN_ON(is_error_page(page)); |
2210 | ||
35149e21 AL |
2211 | kvm_release_pfn_dirty(page_to_pfn(page)); |
2212 | } | |
2213 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
2214 | ||
f7a6509f | 2215 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
2216 | { |
2217 | kvm_set_pfn_dirty(pfn); | |
2218 | kvm_release_pfn_clean(pfn); | |
2219 | } | |
f7a6509f | 2220 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 2221 | |
ba049e93 | 2222 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 2223 | { |
d29c03a5 ML |
2224 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
2225 | SetPageDirty(pfn_to_page(pfn)); | |
8a7ae055 | 2226 | } |
35149e21 AL |
2227 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
2228 | ||
ba049e93 | 2229 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 2230 | { |
a78986aa | 2231 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
2e2e3738 | 2232 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
2233 | } |
2234 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
2235 | ||
ba049e93 | 2236 | void kvm_get_pfn(kvm_pfn_t pfn) |
35149e21 | 2237 | { |
bf4bea8e | 2238 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 2239 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
2240 | } |
2241 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 2242 | |
195aefde IE |
2243 | static int next_segment(unsigned long len, int offset) |
2244 | { | |
2245 | if (len > PAGE_SIZE - offset) | |
2246 | return PAGE_SIZE - offset; | |
2247 | else | |
2248 | return len; | |
2249 | } | |
2250 | ||
8e73485c PB |
2251 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
2252 | void *data, int offset, int len) | |
195aefde | 2253 | { |
e0506bcb IE |
2254 | int r; |
2255 | unsigned long addr; | |
195aefde | 2256 | |
8e73485c | 2257 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
2258 | if (kvm_is_error_hva(addr)) |
2259 | return -EFAULT; | |
3180a7fc | 2260 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 2261 | if (r) |
195aefde | 2262 | return -EFAULT; |
195aefde IE |
2263 | return 0; |
2264 | } | |
8e73485c PB |
2265 | |
2266 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
2267 | int len) | |
2268 | { | |
2269 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2270 | ||
2271 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
2272 | } | |
195aefde IE |
2273 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
2274 | ||
8e73485c PB |
2275 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
2276 | int offset, int len) | |
2277 | { | |
2278 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2279 | ||
2280 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
2281 | } | |
2282 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
2283 | ||
195aefde IE |
2284 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
2285 | { | |
2286 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2287 | int seg; | |
2288 | int offset = offset_in_page(gpa); | |
2289 | int ret; | |
2290 | ||
2291 | while ((seg = next_segment(len, offset)) != 0) { | |
2292 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
2293 | if (ret < 0) | |
2294 | return ret; | |
2295 | offset = 0; | |
2296 | len -= seg; | |
2297 | data += seg; | |
2298 | ++gfn; | |
2299 | } | |
2300 | return 0; | |
2301 | } | |
2302 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
2303 | ||
8e73485c | 2304 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 2305 | { |
7ec54588 | 2306 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 2307 | int seg; |
7ec54588 | 2308 | int offset = offset_in_page(gpa); |
8e73485c PB |
2309 | int ret; |
2310 | ||
2311 | while ((seg = next_segment(len, offset)) != 0) { | |
2312 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
2313 | if (ret < 0) | |
2314 | return ret; | |
2315 | offset = 0; | |
2316 | len -= seg; | |
2317 | data += seg; | |
2318 | ++gfn; | |
2319 | } | |
2320 | return 0; | |
2321 | } | |
2322 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 2323 | |
8e73485c PB |
2324 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
2325 | void *data, int offset, unsigned long len) | |
2326 | { | |
2327 | int r; | |
2328 | unsigned long addr; | |
2329 | ||
2330 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
2331 | if (kvm_is_error_hva(addr)) |
2332 | return -EFAULT; | |
0aac03f0 | 2333 | pagefault_disable(); |
3180a7fc | 2334 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 2335 | pagefault_enable(); |
7ec54588 MT |
2336 | if (r) |
2337 | return -EFAULT; | |
2338 | return 0; | |
2339 | } | |
7ec54588 | 2340 | |
8e73485c PB |
2341 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, |
2342 | void *data, unsigned long len) | |
2343 | { | |
2344 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2345 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2346 | int offset = offset_in_page(gpa); | |
2347 | ||
2348 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
2349 | } | |
2350 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
2351 | ||
2352 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
2353 | const void *data, int offset, int len) | |
195aefde | 2354 | { |
e0506bcb IE |
2355 | int r; |
2356 | unsigned long addr; | |
195aefde | 2357 | |
251eb841 | 2358 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
2359 | if (kvm_is_error_hva(addr)) |
2360 | return -EFAULT; | |
8b0cedff | 2361 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 2362 | if (r) |
195aefde | 2363 | return -EFAULT; |
bc009e43 | 2364 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
2365 | return 0; |
2366 | } | |
8e73485c PB |
2367 | |
2368 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
2369 | const void *data, int offset, int len) | |
2370 | { | |
2371 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2372 | ||
2373 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2374 | } | |
195aefde IE |
2375 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
2376 | ||
8e73485c PB |
2377 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
2378 | const void *data, int offset, int len) | |
2379 | { | |
2380 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2381 | ||
2382 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2383 | } | |
2384 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
2385 | ||
195aefde IE |
2386 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
2387 | unsigned long len) | |
2388 | { | |
2389 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2390 | int seg; | |
2391 | int offset = offset_in_page(gpa); | |
2392 | int ret; | |
2393 | ||
2394 | while ((seg = next_segment(len, offset)) != 0) { | |
2395 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
2396 | if (ret < 0) | |
2397 | return ret; | |
2398 | offset = 0; | |
2399 | len -= seg; | |
2400 | data += seg; | |
2401 | ++gfn; | |
2402 | } | |
2403 | return 0; | |
2404 | } | |
ff651cb6 | 2405 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 2406 | |
8e73485c PB |
2407 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
2408 | unsigned long len) | |
2409 | { | |
2410 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2411 | int seg; | |
2412 | int offset = offset_in_page(gpa); | |
2413 | int ret; | |
2414 | ||
2415 | while ((seg = next_segment(len, offset)) != 0) { | |
2416 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
2417 | if (ret < 0) | |
2418 | return ret; | |
2419 | offset = 0; | |
2420 | len -= seg; | |
2421 | data += seg; | |
2422 | ++gfn; | |
2423 | } | |
2424 | return 0; | |
2425 | } | |
2426 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
2427 | ||
5a2d4365 PB |
2428 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
2429 | struct gfn_to_hva_cache *ghc, | |
2430 | gpa_t gpa, unsigned long len) | |
49c7754c | 2431 | { |
49c7754c | 2432 | int offset = offset_in_page(gpa); |
8f964525 AH |
2433 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
2434 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
2435 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
2436 | gfn_t nr_pages_avail; | |
49c7754c | 2437 | |
6ad1e29f | 2438 | /* Update ghc->generation before performing any error checks. */ |
49c7754c | 2439 | ghc->generation = slots->generation; |
6ad1e29f SC |
2440 | |
2441 | if (start_gfn > end_gfn) { | |
2442 | ghc->hva = KVM_HVA_ERR_BAD; | |
2443 | return -EINVAL; | |
2444 | } | |
f1b9dd5e JM |
2445 | |
2446 | /* | |
2447 | * If the requested region crosses two memslots, we still | |
2448 | * verify that the entire region is valid here. | |
2449 | */ | |
6ad1e29f | 2450 | for ( ; start_gfn <= end_gfn; start_gfn += nr_pages_avail) { |
f1b9dd5e JM |
2451 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); |
2452 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
2453 | &nr_pages_avail); | |
2454 | if (kvm_is_error_hva(ghc->hva)) | |
6ad1e29f | 2455 | return -EFAULT; |
f1b9dd5e JM |
2456 | } |
2457 | ||
2458 | /* Use the slow path for cross page reads and writes. */ | |
6ad1e29f | 2459 | if (nr_pages_needed == 1) |
49c7754c | 2460 | ghc->hva += offset; |
f1b9dd5e | 2461 | else |
8f964525 | 2462 | ghc->memslot = NULL; |
f1b9dd5e | 2463 | |
6ad1e29f SC |
2464 | ghc->gpa = gpa; |
2465 | ghc->len = len; | |
2466 | return 0; | |
49c7754c | 2467 | } |
5a2d4365 | 2468 | |
4e335d9e | 2469 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
2470 | gpa_t gpa, unsigned long len) |
2471 | { | |
4e335d9e | 2472 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
2473 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
2474 | } | |
4e335d9e | 2475 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 2476 | |
4e335d9e | 2477 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
7a86dab8 JM |
2478 | void *data, unsigned int offset, |
2479 | unsigned long len) | |
49c7754c | 2480 | { |
4e335d9e | 2481 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 2482 | int r; |
4ec6e863 | 2483 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 2484 | |
4ec6e863 | 2485 | BUG_ON(len + offset > ghc->len); |
8f964525 | 2486 | |
dc9ce71e SC |
2487 | if (slots->generation != ghc->generation) { |
2488 | if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len)) | |
2489 | return -EFAULT; | |
2490 | } | |
8f964525 | 2491 | |
49c7754c GN |
2492 | if (kvm_is_error_hva(ghc->hva)) |
2493 | return -EFAULT; | |
2494 | ||
fcfbc617 SC |
2495 | if (unlikely(!ghc->memslot)) |
2496 | return kvm_write_guest(kvm, gpa, data, len); | |
2497 | ||
4ec6e863 | 2498 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
2499 | if (r) |
2500 | return -EFAULT; | |
4ec6e863 | 2501 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
2502 | |
2503 | return 0; | |
2504 | } | |
4e335d9e | 2505 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 2506 | |
4e335d9e PB |
2507 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2508 | void *data, unsigned long len) | |
4ec6e863 | 2509 | { |
4e335d9e | 2510 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 2511 | } |
4e335d9e | 2512 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 2513 | |
4e335d9e PB |
2514 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2515 | void *data, unsigned long len) | |
e03b644f | 2516 | { |
4e335d9e | 2517 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f GN |
2518 | int r; |
2519 | ||
8f964525 AH |
2520 | BUG_ON(len > ghc->len); |
2521 | ||
dc9ce71e SC |
2522 | if (slots->generation != ghc->generation) { |
2523 | if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len)) | |
2524 | return -EFAULT; | |
2525 | } | |
8f964525 | 2526 | |
e03b644f GN |
2527 | if (kvm_is_error_hva(ghc->hva)) |
2528 | return -EFAULT; | |
2529 | ||
fcfbc617 SC |
2530 | if (unlikely(!ghc->memslot)) |
2531 | return kvm_read_guest(kvm, ghc->gpa, data, len); | |
2532 | ||
e03b644f GN |
2533 | r = __copy_from_user(data, (void __user *)ghc->hva, len); |
2534 | if (r) | |
2535 | return -EFAULT; | |
2536 | ||
2537 | return 0; | |
2538 | } | |
4e335d9e | 2539 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 2540 | |
195aefde IE |
2541 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
2542 | { | |
8a3caa6d HC |
2543 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
2544 | ||
2545 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
2546 | } |
2547 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2548 | ||
2549 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2550 | { | |
2551 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2552 | int seg; | |
2553 | int offset = offset_in_page(gpa); | |
2554 | int ret; | |
2555 | ||
bfda0e84 | 2556 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
2557 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
2558 | if (ret < 0) | |
2559 | return ret; | |
2560 | offset = 0; | |
2561 | len -= seg; | |
2562 | ++gfn; | |
2563 | } | |
2564 | return 0; | |
2565 | } | |
2566 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2567 | ||
bc009e43 | 2568 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 2569 | gfn_t gfn) |
6aa8b732 | 2570 | { |
7e9d619d RR |
2571 | if (memslot && memslot->dirty_bitmap) { |
2572 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 2573 | |
b74ca3b3 | 2574 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
2575 | } |
2576 | } | |
2577 | ||
49c7754c GN |
2578 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
2579 | { | |
2580 | struct kvm_memory_slot *memslot; | |
2581 | ||
2582 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 2583 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 2584 | } |
2ba9f0d8 | 2585 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 2586 | |
8e73485c PB |
2587 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
2588 | { | |
2589 | struct kvm_memory_slot *memslot; | |
2590 | ||
2591 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2592 | mark_page_dirty_in_slot(memslot, gfn); | |
2593 | } | |
2594 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2595 | ||
20b7035c JS |
2596 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
2597 | { | |
2598 | if (!vcpu->sigset_active) | |
2599 | return; | |
2600 | ||
2601 | /* | |
2602 | * This does a lockless modification of ->real_blocked, which is fine | |
2603 | * because, only current can change ->real_blocked and all readers of | |
2604 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2605 | * of ->blocked. | |
2606 | */ | |
2607 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2608 | } | |
2609 | ||
2610 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2611 | { | |
2612 | if (!vcpu->sigset_active) | |
2613 | return; | |
2614 | ||
2615 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2616 | sigemptyset(¤t->real_blocked); | |
2617 | } | |
2618 | ||
aca6ff29 WL |
2619 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
2620 | { | |
dee339b5 | 2621 | unsigned int old, val, grow, grow_start; |
aca6ff29 | 2622 | |
2cbd7824 | 2623 | old = val = vcpu->halt_poll_ns; |
dee339b5 | 2624 | grow_start = READ_ONCE(halt_poll_ns_grow_start); |
6b6de68c | 2625 | grow = READ_ONCE(halt_poll_ns_grow); |
7fa08e71 NW |
2626 | if (!grow) |
2627 | goto out; | |
2628 | ||
dee339b5 NW |
2629 | val *= grow; |
2630 | if (val < grow_start) | |
2631 | val = grow_start; | |
aca6ff29 | 2632 | |
313f636d DM |
2633 | if (val > halt_poll_ns) |
2634 | val = halt_poll_ns; | |
2635 | ||
aca6ff29 | 2636 | vcpu->halt_poll_ns = val; |
7fa08e71 | 2637 | out: |
2cbd7824 | 2638 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2639 | } |
2640 | ||
2641 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2642 | { | |
6b6de68c | 2643 | unsigned int old, val, shrink; |
aca6ff29 | 2644 | |
2cbd7824 | 2645 | old = val = vcpu->halt_poll_ns; |
6b6de68c CB |
2646 | shrink = READ_ONCE(halt_poll_ns_shrink); |
2647 | if (shrink == 0) | |
aca6ff29 WL |
2648 | val = 0; |
2649 | else | |
6b6de68c | 2650 | val /= shrink; |
aca6ff29 WL |
2651 | |
2652 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 2653 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2654 | } |
2655 | ||
f7819512 PB |
2656 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
2657 | { | |
50c28f21 JS |
2658 | int ret = -EINTR; |
2659 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
2660 | ||
f7819512 PB |
2661 | if (kvm_arch_vcpu_runnable(vcpu)) { |
2662 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 2663 | goto out; |
f7819512 PB |
2664 | } |
2665 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 2666 | goto out; |
f7819512 | 2667 | if (signal_pending(current)) |
50c28f21 | 2668 | goto out; |
f7819512 | 2669 | |
50c28f21 JS |
2670 | ret = 0; |
2671 | out: | |
2672 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2673 | return ret; | |
f7819512 PB |
2674 | } |
2675 | ||
b6958ce4 ED |
2676 | /* |
2677 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2678 | */ | |
8776e519 | 2679 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 2680 | { |
f7819512 | 2681 | ktime_t start, cur; |
8577370f | 2682 | DECLARE_SWAITQUEUE(wait); |
f7819512 | 2683 | bool waited = false; |
aca6ff29 | 2684 | u64 block_ns; |
f7819512 | 2685 | |
07ab0f8d MZ |
2686 | kvm_arch_vcpu_blocking(vcpu); |
2687 | ||
f7819512 | 2688 | start = cur = ktime_get(); |
cdd6ad3a | 2689 | if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) { |
19020f8a | 2690 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
f95ef0cd | 2691 | |
62bea5bf | 2692 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2693 | do { |
2694 | /* | |
2695 | * This sets KVM_REQ_UNHALT if an interrupt | |
2696 | * arrives. | |
2697 | */ | |
2698 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2699 | ++vcpu->stat.halt_successful_poll; | |
3491caf2 CB |
2700 | if (!vcpu_valid_wakeup(vcpu)) |
2701 | ++vcpu->stat.halt_poll_invalid; | |
f7819512 PB |
2702 | goto out; |
2703 | } | |
2704 | cur = ktime_get(); | |
2705 | } while (single_task_running() && ktime_before(cur, stop)); | |
2706 | } | |
e5c239cf MT |
2707 | |
2708 | for (;;) { | |
b3dae109 | 2709 | prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
e5c239cf | 2710 | |
f7819512 | 2711 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2712 | break; |
2713 | ||
f7819512 | 2714 | waited = true; |
b6958ce4 | 2715 | schedule(); |
b6958ce4 | 2716 | } |
d3bef15f | 2717 | |
8577370f | 2718 | finish_swait(&vcpu->wq, &wait); |
f7819512 | 2719 | cur = ktime_get(); |
f7819512 | 2720 | out: |
07ab0f8d | 2721 | kvm_arch_vcpu_unblocking(vcpu); |
aca6ff29 WL |
2722 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2723 | ||
44551b2f WL |
2724 | if (!kvm_arch_no_poll(vcpu)) { |
2725 | if (!vcpu_valid_wakeup(vcpu)) { | |
aca6ff29 | 2726 | shrink_halt_poll_ns(vcpu); |
44551b2f WL |
2727 | } else if (halt_poll_ns) { |
2728 | if (block_ns <= vcpu->halt_poll_ns) | |
2729 | ; | |
2730 | /* we had a long block, shrink polling */ | |
2731 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) | |
2732 | shrink_halt_poll_ns(vcpu); | |
2733 | /* we had a short halt and our poll time is too small */ | |
2734 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2735 | block_ns < halt_poll_ns) | |
2736 | grow_halt_poll_ns(vcpu); | |
2737 | } else { | |
2738 | vcpu->halt_poll_ns = 0; | |
2739 | } | |
2740 | } | |
aca6ff29 | 2741 | |
3491caf2 CB |
2742 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
2743 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 2744 | } |
2ba9f0d8 | 2745 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2746 | |
178f02ff | 2747 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 2748 | { |
8577370f | 2749 | struct swait_queue_head *wqp; |
b6d33834 CD |
2750 | |
2751 | wqp = kvm_arch_vcpu_wq(vcpu); | |
5e0018b3 | 2752 | if (swq_has_sleeper(wqp)) { |
b3dae109 | 2753 | swake_up_one(wqp); |
d73eb57b | 2754 | WRITE_ONCE(vcpu->ready, true); |
b6d33834 | 2755 | ++vcpu->stat.halt_wakeup; |
178f02ff | 2756 | return true; |
b6d33834 CD |
2757 | } |
2758 | ||
178f02ff | 2759 | return false; |
dd1a4cc1 RK |
2760 | } |
2761 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2762 | ||
0266c894 | 2763 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
2764 | /* |
2765 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2766 | */ | |
2767 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2768 | { | |
2769 | int me; | |
2770 | int cpu = vcpu->cpu; | |
2771 | ||
178f02ff RK |
2772 | if (kvm_vcpu_wake_up(vcpu)) |
2773 | return; | |
2774 | ||
b6d33834 CD |
2775 | me = get_cpu(); |
2776 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2777 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2778 | smp_send_reschedule(cpu); | |
2779 | put_cpu(); | |
2780 | } | |
a20ed54d | 2781 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 2782 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2783 | |
fa93384f | 2784 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2785 | { |
2786 | struct pid *pid; | |
2787 | struct task_struct *task = NULL; | |
fa93384f | 2788 | int ret = 0; |
41628d33 KW |
2789 | |
2790 | rcu_read_lock(); | |
2791 | pid = rcu_dereference(target->pid); | |
2792 | if (pid) | |
27fbe64b | 2793 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2794 | rcu_read_unlock(); |
2795 | if (!task) | |
c45c528e | 2796 | return ret; |
c45c528e | 2797 | ret = yield_to(task, 1); |
41628d33 | 2798 | put_task_struct(task); |
c45c528e R |
2799 | |
2800 | return ret; | |
41628d33 KW |
2801 | } |
2802 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2803 | ||
06e48c51 R |
2804 | /* |
2805 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2806 | * Most eligible candidate to yield is decided by following heuristics: | |
2807 | * | |
2808 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2809 | * (preempted lock holder), indicated by @in_spin_loop. | |
2810 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2811 | * | |
2812 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2813 | * chance last time (mostly it has become eligible now since we have probably | |
2814 | * yielded to lockholder in last iteration. This is done by toggling | |
2815 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2816 | * | |
2817 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2818 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2819 | * burning. Giving priority for a potential lock-holder increases lock | |
2820 | * progress. | |
2821 | * | |
2822 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2823 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2824 | * and continue with next VCPU and so on. | |
2825 | */ | |
7940876e | 2826 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2827 | { |
4a55dd72 | 2828 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2829 | bool eligible; |
2830 | ||
2831 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2832 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2833 | |
2834 | if (vcpu->spin_loop.in_spin_loop) | |
2835 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2836 | ||
2837 | return eligible; | |
4a55dd72 SW |
2838 | #else |
2839 | return true; | |
06e48c51 | 2840 | #endif |
4a55dd72 | 2841 | } |
c45c528e | 2842 | |
17e433b5 WL |
2843 | /* |
2844 | * Unlike kvm_arch_vcpu_runnable, this function is called outside | |
2845 | * a vcpu_load/vcpu_put pair. However, for most architectures | |
2846 | * kvm_arch_vcpu_runnable does not require vcpu_load. | |
2847 | */ | |
2848 | bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) | |
2849 | { | |
2850 | return kvm_arch_vcpu_runnable(vcpu); | |
2851 | } | |
2852 | ||
2853 | static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu) | |
2854 | { | |
2855 | if (kvm_arch_dy_runnable(vcpu)) | |
2856 | return true; | |
2857 | ||
2858 | #ifdef CONFIG_KVM_ASYNC_PF | |
2859 | if (!list_empty_careful(&vcpu->async_pf.done)) | |
2860 | return true; | |
2861 | #endif | |
2862 | ||
2863 | return false; | |
2864 | } | |
2865 | ||
199b5763 | 2866 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 2867 | { |
217ece61 RR |
2868 | struct kvm *kvm = me->kvm; |
2869 | struct kvm_vcpu *vcpu; | |
2870 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2871 | int yielded = 0; | |
c45c528e | 2872 | int try = 3; |
217ece61 RR |
2873 | int pass; |
2874 | int i; | |
d255f4f2 | 2875 | |
4c088493 | 2876 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2877 | /* |
2878 | * We boost the priority of a VCPU that is runnable but not | |
2879 | * currently running, because it got preempted by something | |
2880 | * else and called schedule in __vcpu_run. Hopefully that | |
2881 | * VCPU is holding the lock that we need and will release it. | |
2882 | * We approximate round-robin by starting at the last boosted VCPU. | |
2883 | */ | |
c45c528e | 2884 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2885 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2886 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2887 | i = last_boosted_vcpu; |
2888 | continue; | |
2889 | } else if (pass && i > last_boosted_vcpu) | |
2890 | break; | |
d73eb57b | 2891 | if (!READ_ONCE(vcpu->ready)) |
7bc7ae25 | 2892 | continue; |
217ece61 RR |
2893 | if (vcpu == me) |
2894 | continue; | |
17e433b5 | 2895 | if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu)) |
217ece61 | 2896 | continue; |
046ddeed WL |
2897 | if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode && |
2898 | !kvm_arch_vcpu_in_kernel(vcpu)) | |
199b5763 | 2899 | continue; |
06e48c51 R |
2900 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2901 | continue; | |
c45c528e R |
2902 | |
2903 | yielded = kvm_vcpu_yield_to(vcpu); | |
2904 | if (yielded > 0) { | |
217ece61 | 2905 | kvm->last_boosted_vcpu = i; |
217ece61 | 2906 | break; |
c45c528e R |
2907 | } else if (yielded < 0) { |
2908 | try--; | |
2909 | if (!try) | |
2910 | break; | |
217ece61 | 2911 | } |
217ece61 RR |
2912 | } |
2913 | } | |
4c088493 | 2914 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2915 | |
2916 | /* Ensure vcpu is not eligible during next spinloop */ | |
2917 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2918 | } |
2919 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2920 | ||
1499fa80 | 2921 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 2922 | { |
11bac800 | 2923 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
2924 | struct page *page; |
2925 | ||
e4a533a4 | 2926 | if (vmf->pgoff == 0) |
039576c0 | 2927 | page = virt_to_page(vcpu->run); |
09566765 | 2928 | #ifdef CONFIG_X86 |
e4a533a4 | 2929 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2930 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 2931 | #endif |
4b4357e0 | 2932 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
2933 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
2934 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2935 | #endif |
039576c0 | 2936 | else |
5b1c1493 | 2937 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2938 | get_page(page); |
e4a533a4 NP |
2939 | vmf->page = page; |
2940 | return 0; | |
9a2bb7f4 AK |
2941 | } |
2942 | ||
f0f37e2f | 2943 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2944 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2945 | }; |
2946 | ||
2947 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2948 | { | |
2949 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2950 | return 0; | |
2951 | } | |
2952 | ||
bccf2150 AK |
2953 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2954 | { | |
2955 | struct kvm_vcpu *vcpu = filp->private_data; | |
2956 | ||
45b5939e | 2957 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
66c0b394 | 2958 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2959 | return 0; |
2960 | } | |
2961 | ||
3d3aab1b | 2962 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2963 | .release = kvm_vcpu_release, |
2964 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 2965 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2966 | .llseek = noop_llseek, |
7ddfd3e0 | 2967 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
2968 | }; |
2969 | ||
2970 | /* | |
2971 | * Allocates an inode for the vcpu. | |
2972 | */ | |
2973 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2974 | { | |
e46b4692 MY |
2975 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
2976 | ||
2977 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
2978 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
2979 | } |
2980 | ||
3e7093d0 | 2981 | static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
45b5939e | 2982 | { |
741cbbae | 2983 | #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS |
45b5939e | 2984 | char dir_name[ITOA_MAX_LEN * 2]; |
45b5939e | 2985 | |
45b5939e | 2986 | if (!debugfs_initialized()) |
3e7093d0 | 2987 | return; |
45b5939e LC |
2988 | |
2989 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2990 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
3e7093d0 | 2991 | vcpu->kvm->debugfs_dentry); |
45b5939e | 2992 | |
3e7093d0 | 2993 | kvm_arch_create_vcpu_debugfs(vcpu); |
741cbbae | 2994 | #endif |
45b5939e LC |
2995 | } |
2996 | ||
c5ea7660 AK |
2997 | /* |
2998 | * Creates some virtual cpus. Good luck creating more than one. | |
2999 | */ | |
73880c80 | 3000 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
3001 | { |
3002 | int r; | |
e09fefde | 3003 | struct kvm_vcpu *vcpu; |
8bd826d6 | 3004 | struct page *page; |
c5ea7660 | 3005 | |
0b1b1dfd | 3006 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
3007 | return -EINVAL; |
3008 | ||
6c7caebc PB |
3009 | mutex_lock(&kvm->lock); |
3010 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
3011 | mutex_unlock(&kvm->lock); | |
3012 | return -EINVAL; | |
3013 | } | |
3014 | ||
3015 | kvm->created_vcpus++; | |
3016 | mutex_unlock(&kvm->lock); | |
3017 | ||
897cc38e SC |
3018 | r = kvm_arch_vcpu_precreate(kvm, id); |
3019 | if (r) | |
3020 | goto vcpu_decrement; | |
3021 | ||
e529ef66 SC |
3022 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
3023 | if (!vcpu) { | |
3024 | r = -ENOMEM; | |
6c7caebc PB |
3025 | goto vcpu_decrement; |
3026 | } | |
c5ea7660 | 3027 | |
fcd97ad5 | 3028 | BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE); |
8bd826d6 SC |
3029 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
3030 | if (!page) { | |
3031 | r = -ENOMEM; | |
e529ef66 | 3032 | goto vcpu_free; |
8bd826d6 SC |
3033 | } |
3034 | vcpu->run = page_address(page); | |
3035 | ||
3036 | kvm_vcpu_init(vcpu, kvm, id); | |
e529ef66 SC |
3037 | |
3038 | r = kvm_arch_vcpu_create(vcpu); | |
3039 | if (r) | |
8bd826d6 | 3040 | goto vcpu_free_run_page; |
e529ef66 | 3041 | |
3e7093d0 | 3042 | kvm_create_vcpu_debugfs(vcpu); |
45b5939e | 3043 | |
11ec2804 | 3044 | mutex_lock(&kvm->lock); |
e09fefde DH |
3045 | if (kvm_get_vcpu_by_id(kvm, id)) { |
3046 | r = -EEXIST; | |
3047 | goto unlock_vcpu_destroy; | |
3048 | } | |
73880c80 | 3049 | |
8750e72a RK |
3050 | vcpu->vcpu_idx = atomic_read(&kvm->online_vcpus); |
3051 | BUG_ON(kvm->vcpus[vcpu->vcpu_idx]); | |
c5ea7660 | 3052 | |
fb3f0f51 | 3053 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 3054 | kvm_get_kvm(kvm); |
bccf2150 | 3055 | r = create_vcpu_fd(vcpu); |
73880c80 | 3056 | if (r < 0) { |
149487bd | 3057 | kvm_put_kvm_no_destroy(kvm); |
d780592b | 3058 | goto unlock_vcpu_destroy; |
73880c80 GN |
3059 | } |
3060 | ||
8750e72a | 3061 | kvm->vcpus[vcpu->vcpu_idx] = vcpu; |
dd489240 PB |
3062 | |
3063 | /* | |
3064 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
3065 | * before kvm->online_vcpu's incremented value. | |
3066 | */ | |
73880c80 GN |
3067 | smp_wmb(); |
3068 | atomic_inc(&kvm->online_vcpus); | |
3069 | ||
73880c80 | 3070 | mutex_unlock(&kvm->lock); |
42897d86 | 3071 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 3072 | return r; |
39c3b86e | 3073 | |
d780592b | 3074 | unlock_vcpu_destroy: |
7d8fece6 | 3075 | mutex_unlock(&kvm->lock); |
45b5939e | 3076 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
d40ccc62 | 3077 | kvm_arch_vcpu_destroy(vcpu); |
8bd826d6 SC |
3078 | vcpu_free_run_page: |
3079 | free_page((unsigned long)vcpu->run); | |
e529ef66 SC |
3080 | vcpu_free: |
3081 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
6c7caebc PB |
3082 | vcpu_decrement: |
3083 | mutex_lock(&kvm->lock); | |
3084 | kvm->created_vcpus--; | |
3085 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
3086 | return r; |
3087 | } | |
3088 | ||
1961d276 AK |
3089 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
3090 | { | |
3091 | if (sigset) { | |
3092 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
3093 | vcpu->sigset_active = 1; | |
3094 | vcpu->sigset = *sigset; | |
3095 | } else | |
3096 | vcpu->sigset_active = 0; | |
3097 | return 0; | |
3098 | } | |
3099 | ||
bccf2150 AK |
3100 | static long kvm_vcpu_ioctl(struct file *filp, |
3101 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 3102 | { |
bccf2150 | 3103 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 3104 | void __user *argp = (void __user *)arg; |
313a3dc7 | 3105 | int r; |
fa3795a7 DH |
3106 | struct kvm_fpu *fpu = NULL; |
3107 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 3108 | |
6d4e4c4f AK |
3109 | if (vcpu->kvm->mm != current->mm) |
3110 | return -EIO; | |
2122ff5e | 3111 | |
2ea75be3 DM |
3112 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
3113 | return -EINVAL; | |
3114 | ||
2122ff5e | 3115 | /* |
5cb0944c PB |
3116 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
3117 | * execution; mutex_lock() would break them. | |
2122ff5e | 3118 | */ |
5cb0944c PB |
3119 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
3120 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 3121 | return r; |
2122ff5e | 3122 | |
ec7660cc CD |
3123 | if (mutex_lock_killable(&vcpu->mutex)) |
3124 | return -EINTR; | |
6aa8b732 | 3125 | switch (ioctl) { |
0e4524a5 CB |
3126 | case KVM_RUN: { |
3127 | struct pid *oldpid; | |
f0fe5108 AK |
3128 | r = -EINVAL; |
3129 | if (arg) | |
3130 | goto out; | |
0e4524a5 | 3131 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 3132 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 3133 | /* The thread running this VCPU changed. */ |
bd2a6394 | 3134 | struct pid *newpid; |
f95ef0cd | 3135 | |
bd2a6394 CD |
3136 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
3137 | if (r) | |
3138 | break; | |
3139 | ||
3140 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
3141 | rcu_assign_pointer(vcpu->pid, newpid); |
3142 | if (oldpid) | |
3143 | synchronize_rcu(); | |
3144 | put_pid(oldpid); | |
3145 | } | |
b6c7a5dc | 3146 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 3147 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 3148 | break; |
0e4524a5 | 3149 | } |
6aa8b732 | 3150 | case KVM_GET_REGS: { |
3e4bb3ac | 3151 | struct kvm_regs *kvm_regs; |
6aa8b732 | 3152 | |
3e4bb3ac | 3153 | r = -ENOMEM; |
b12ce36a | 3154 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT); |
3e4bb3ac | 3155 | if (!kvm_regs) |
6aa8b732 | 3156 | goto out; |
3e4bb3ac XZ |
3157 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
3158 | if (r) | |
3159 | goto out_free1; | |
6aa8b732 | 3160 | r = -EFAULT; |
3e4bb3ac XZ |
3161 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
3162 | goto out_free1; | |
6aa8b732 | 3163 | r = 0; |
3e4bb3ac XZ |
3164 | out_free1: |
3165 | kfree(kvm_regs); | |
6aa8b732 AK |
3166 | break; |
3167 | } | |
3168 | case KVM_SET_REGS: { | |
3e4bb3ac | 3169 | struct kvm_regs *kvm_regs; |
6aa8b732 | 3170 | |
3e4bb3ac | 3171 | r = -ENOMEM; |
ff5c2c03 SL |
3172 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
3173 | if (IS_ERR(kvm_regs)) { | |
3174 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 3175 | goto out; |
ff5c2c03 | 3176 | } |
3e4bb3ac | 3177 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 3178 | kfree(kvm_regs); |
6aa8b732 AK |
3179 | break; |
3180 | } | |
3181 | case KVM_GET_SREGS: { | |
b12ce36a BG |
3182 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), |
3183 | GFP_KERNEL_ACCOUNT); | |
fa3795a7 DH |
3184 | r = -ENOMEM; |
3185 | if (!kvm_sregs) | |
3186 | goto out; | |
3187 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
3188 | if (r) |
3189 | goto out; | |
3190 | r = -EFAULT; | |
fa3795a7 | 3191 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
3192 | goto out; |
3193 | r = 0; | |
3194 | break; | |
3195 | } | |
3196 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
3197 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
3198 | if (IS_ERR(kvm_sregs)) { | |
3199 | r = PTR_ERR(kvm_sregs); | |
18595411 | 3200 | kvm_sregs = NULL; |
6aa8b732 | 3201 | goto out; |
ff5c2c03 | 3202 | } |
fa3795a7 | 3203 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
3204 | break; |
3205 | } | |
62d9f0db MT |
3206 | case KVM_GET_MP_STATE: { |
3207 | struct kvm_mp_state mp_state; | |
3208 | ||
3209 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
3210 | if (r) | |
3211 | goto out; | |
3212 | r = -EFAULT; | |
893bdbf1 | 3213 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
3214 | goto out; |
3215 | r = 0; | |
3216 | break; | |
3217 | } | |
3218 | case KVM_SET_MP_STATE: { | |
3219 | struct kvm_mp_state mp_state; | |
3220 | ||
3221 | r = -EFAULT; | |
893bdbf1 | 3222 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
3223 | goto out; |
3224 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
3225 | break; |
3226 | } | |
6aa8b732 AK |
3227 | case KVM_TRANSLATE: { |
3228 | struct kvm_translation tr; | |
3229 | ||
3230 | r = -EFAULT; | |
893bdbf1 | 3231 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 3232 | goto out; |
8b006791 | 3233 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
3234 | if (r) |
3235 | goto out; | |
3236 | r = -EFAULT; | |
893bdbf1 | 3237 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
3238 | goto out; |
3239 | r = 0; | |
3240 | break; | |
3241 | } | |
d0bfb940 JK |
3242 | case KVM_SET_GUEST_DEBUG: { |
3243 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
3244 | |
3245 | r = -EFAULT; | |
893bdbf1 | 3246 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 3247 | goto out; |
d0bfb940 | 3248 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
3249 | break; |
3250 | } | |
1961d276 AK |
3251 | case KVM_SET_SIGNAL_MASK: { |
3252 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
3253 | struct kvm_signal_mask kvm_sigmask; | |
3254 | sigset_t sigset, *p; | |
3255 | ||
3256 | p = NULL; | |
3257 | if (argp) { | |
3258 | r = -EFAULT; | |
3259 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 3260 | sizeof(kvm_sigmask))) |
1961d276 AK |
3261 | goto out; |
3262 | r = -EINVAL; | |
893bdbf1 | 3263 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
3264 | goto out; |
3265 | r = -EFAULT; | |
3266 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 3267 | sizeof(sigset))) |
1961d276 AK |
3268 | goto out; |
3269 | p = &sigset; | |
3270 | } | |
376d41ff | 3271 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
3272 | break; |
3273 | } | |
b8836737 | 3274 | case KVM_GET_FPU: { |
b12ce36a | 3275 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT); |
fa3795a7 DH |
3276 | r = -ENOMEM; |
3277 | if (!fpu) | |
3278 | goto out; | |
3279 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
3280 | if (r) |
3281 | goto out; | |
3282 | r = -EFAULT; | |
fa3795a7 | 3283 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
3284 | goto out; |
3285 | r = 0; | |
3286 | break; | |
3287 | } | |
3288 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
3289 | fpu = memdup_user(argp, sizeof(*fpu)); |
3290 | if (IS_ERR(fpu)) { | |
3291 | r = PTR_ERR(fpu); | |
18595411 | 3292 | fpu = NULL; |
b8836737 | 3293 | goto out; |
ff5c2c03 | 3294 | } |
fa3795a7 | 3295 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
3296 | break; |
3297 | } | |
bccf2150 | 3298 | default: |
313a3dc7 | 3299 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
3300 | } |
3301 | out: | |
ec7660cc | 3302 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
3303 | kfree(fpu); |
3304 | kfree(kvm_sregs); | |
bccf2150 AK |
3305 | return r; |
3306 | } | |
3307 | ||
de8e5d74 | 3308 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
3309 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
3310 | unsigned int ioctl, unsigned long arg) | |
3311 | { | |
3312 | struct kvm_vcpu *vcpu = filp->private_data; | |
3313 | void __user *argp = compat_ptr(arg); | |
3314 | int r; | |
3315 | ||
3316 | if (vcpu->kvm->mm != current->mm) | |
3317 | return -EIO; | |
3318 | ||
3319 | switch (ioctl) { | |
3320 | case KVM_SET_SIGNAL_MASK: { | |
3321 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
3322 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
3323 | sigset_t sigset; |
3324 | ||
3325 | if (argp) { | |
3326 | r = -EFAULT; | |
3327 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 3328 | sizeof(kvm_sigmask))) |
1dda606c AG |
3329 | goto out; |
3330 | r = -EINVAL; | |
3968cf62 | 3331 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
3332 | goto out; |
3333 | r = -EFAULT; | |
3968cf62 | 3334 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) |
1dda606c | 3335 | goto out; |
760a9a30 AC |
3336 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
3337 | } else | |
3338 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
3339 | break; |
3340 | } | |
3341 | default: | |
3342 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
3343 | } | |
3344 | ||
3345 | out: | |
3346 | return r; | |
3347 | } | |
3348 | #endif | |
3349 | ||
a1cd3f08 CLG |
3350 | static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma) |
3351 | { | |
3352 | struct kvm_device *dev = filp->private_data; | |
3353 | ||
3354 | if (dev->ops->mmap) | |
3355 | return dev->ops->mmap(dev, vma); | |
3356 | ||
3357 | return -ENODEV; | |
3358 | } | |
3359 | ||
852b6d57 SW |
3360 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
3361 | int (*accessor)(struct kvm_device *dev, | |
3362 | struct kvm_device_attr *attr), | |
3363 | unsigned long arg) | |
3364 | { | |
3365 | struct kvm_device_attr attr; | |
3366 | ||
3367 | if (!accessor) | |
3368 | return -EPERM; | |
3369 | ||
3370 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
3371 | return -EFAULT; | |
3372 | ||
3373 | return accessor(dev, &attr); | |
3374 | } | |
3375 | ||
3376 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
3377 | unsigned long arg) | |
3378 | { | |
3379 | struct kvm_device *dev = filp->private_data; | |
3380 | ||
ddba9180 SC |
3381 | if (dev->kvm->mm != current->mm) |
3382 | return -EIO; | |
3383 | ||
852b6d57 SW |
3384 | switch (ioctl) { |
3385 | case KVM_SET_DEVICE_ATTR: | |
3386 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
3387 | case KVM_GET_DEVICE_ATTR: | |
3388 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
3389 | case KVM_HAS_DEVICE_ATTR: | |
3390 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
3391 | default: | |
3392 | if (dev->ops->ioctl) | |
3393 | return dev->ops->ioctl(dev, ioctl, arg); | |
3394 | ||
3395 | return -ENOTTY; | |
3396 | } | |
3397 | } | |
3398 | ||
852b6d57 SW |
3399 | static int kvm_device_release(struct inode *inode, struct file *filp) |
3400 | { | |
3401 | struct kvm_device *dev = filp->private_data; | |
3402 | struct kvm *kvm = dev->kvm; | |
3403 | ||
2bde9b3e CLG |
3404 | if (dev->ops->release) { |
3405 | mutex_lock(&kvm->lock); | |
3406 | list_del(&dev->vm_node); | |
3407 | dev->ops->release(dev); | |
3408 | mutex_unlock(&kvm->lock); | |
3409 | } | |
3410 | ||
852b6d57 SW |
3411 | kvm_put_kvm(kvm); |
3412 | return 0; | |
3413 | } | |
3414 | ||
3415 | static const struct file_operations kvm_device_fops = { | |
3416 | .unlocked_ioctl = kvm_device_ioctl, | |
3417 | .release = kvm_device_release, | |
7ddfd3e0 | 3418 | KVM_COMPAT(kvm_device_ioctl), |
a1cd3f08 | 3419 | .mmap = kvm_device_mmap, |
852b6d57 SW |
3420 | }; |
3421 | ||
3422 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
3423 | { | |
3424 | if (filp->f_op != &kvm_device_fops) | |
3425 | return NULL; | |
3426 | ||
3427 | return filp->private_data; | |
3428 | } | |
3429 | ||
8538cb22 | 3430 | static const struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 3431 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
3432 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
3433 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 3434 | #endif |
d60eacb0 WD |
3435 | }; |
3436 | ||
8538cb22 | 3437 | int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type) |
d60eacb0 WD |
3438 | { |
3439 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
3440 | return -ENOSPC; | |
3441 | ||
3442 | if (kvm_device_ops_table[type] != NULL) | |
3443 | return -EEXIST; | |
3444 | ||
3445 | kvm_device_ops_table[type] = ops; | |
3446 | return 0; | |
3447 | } | |
3448 | ||
571ee1b6 WL |
3449 | void kvm_unregister_device_ops(u32 type) |
3450 | { | |
3451 | if (kvm_device_ops_table[type] != NULL) | |
3452 | kvm_device_ops_table[type] = NULL; | |
3453 | } | |
3454 | ||
852b6d57 SW |
3455 | static int kvm_ioctl_create_device(struct kvm *kvm, |
3456 | struct kvm_create_device *cd) | |
3457 | { | |
8538cb22 | 3458 | const struct kvm_device_ops *ops = NULL; |
852b6d57 SW |
3459 | struct kvm_device *dev; |
3460 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
1d487e9b | 3461 | int type; |
852b6d57 SW |
3462 | int ret; |
3463 | ||
d60eacb0 WD |
3464 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
3465 | return -ENODEV; | |
3466 | ||
1d487e9b PB |
3467 | type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table)); |
3468 | ops = kvm_device_ops_table[type]; | |
d60eacb0 | 3469 | if (ops == NULL) |
852b6d57 | 3470 | return -ENODEV; |
852b6d57 SW |
3471 | |
3472 | if (test) | |
3473 | return 0; | |
3474 | ||
b12ce36a | 3475 | dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT); |
852b6d57 SW |
3476 | if (!dev) |
3477 | return -ENOMEM; | |
3478 | ||
3479 | dev->ops = ops; | |
3480 | dev->kvm = kvm; | |
852b6d57 | 3481 | |
a28ebea2 | 3482 | mutex_lock(&kvm->lock); |
1d487e9b | 3483 | ret = ops->create(dev, type); |
852b6d57 | 3484 | if (ret < 0) { |
a28ebea2 | 3485 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
3486 | kfree(dev); |
3487 | return ret; | |
3488 | } | |
a28ebea2 CD |
3489 | list_add(&dev->vm_node, &kvm->devices); |
3490 | mutex_unlock(&kvm->lock); | |
852b6d57 | 3491 | |
023e9fdd CD |
3492 | if (ops->init) |
3493 | ops->init(dev); | |
3494 | ||
cfa39381 | 3495 | kvm_get_kvm(kvm); |
24009b05 | 3496 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 3497 | if (ret < 0) { |
149487bd | 3498 | kvm_put_kvm_no_destroy(kvm); |
a28ebea2 CD |
3499 | mutex_lock(&kvm->lock); |
3500 | list_del(&dev->vm_node); | |
3501 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 3502 | ops->destroy(dev); |
852b6d57 SW |
3503 | return ret; |
3504 | } | |
3505 | ||
852b6d57 SW |
3506 | cd->fd = ret; |
3507 | return 0; | |
3508 | } | |
3509 | ||
92b591a4 AG |
3510 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
3511 | { | |
3512 | switch (arg) { | |
3513 | case KVM_CAP_USER_MEMORY: | |
3514 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
3515 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
3516 | case KVM_CAP_INTERNAL_ERROR_DATA: |
3517 | #ifdef CONFIG_HAVE_KVM_MSI | |
3518 | case KVM_CAP_SIGNAL_MSI: | |
3519 | #endif | |
297e2105 | 3520 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 3521 | case KVM_CAP_IRQFD: |
92b591a4 AG |
3522 | case KVM_CAP_IRQFD_RESAMPLE: |
3523 | #endif | |
e9ea5069 | 3524 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 | 3525 | case KVM_CAP_CHECK_EXTENSION_VM: |
e5d83c74 | 3526 | case KVM_CAP_ENABLE_CAP_VM: |
92b591a4 | 3527 | return 1; |
4b4357e0 | 3528 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
3529 | case KVM_CAP_COALESCED_MMIO: |
3530 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
3531 | case KVM_CAP_COALESCED_PIO: |
3532 | return 1; | |
30422558 | 3533 | #endif |
3c9bd400 JZ |
3534 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3535 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: | |
3536 | return KVM_DIRTY_LOG_MANUAL_CAPS; | |
3537 | #endif | |
92b591a4 AG |
3538 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3539 | case KVM_CAP_IRQ_ROUTING: | |
3540 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
3541 | #endif |
3542 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
3543 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
3544 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 3545 | #endif |
c110ae57 PB |
3546 | case KVM_CAP_NR_MEMSLOTS: |
3547 | return KVM_USER_MEM_SLOTS; | |
92b591a4 AG |
3548 | default: |
3549 | break; | |
3550 | } | |
3551 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
3552 | } | |
3553 | ||
e5d83c74 PB |
3554 | int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, |
3555 | struct kvm_enable_cap *cap) | |
3556 | { | |
3557 | return -EINVAL; | |
3558 | } | |
3559 | ||
3560 | static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, | |
3561 | struct kvm_enable_cap *cap) | |
3562 | { | |
3563 | switch (cap->cap) { | |
2a31b9db | 3564 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3c9bd400 JZ |
3565 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: { |
3566 | u64 allowed_options = KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE; | |
3567 | ||
3568 | if (cap->args[0] & KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE) | |
3569 | allowed_options = KVM_DIRTY_LOG_MANUAL_CAPS; | |
3570 | ||
3571 | if (cap->flags || (cap->args[0] & ~allowed_options)) | |
2a31b9db PB |
3572 | return -EINVAL; |
3573 | kvm->manual_dirty_log_protect = cap->args[0]; | |
3574 | return 0; | |
3c9bd400 | 3575 | } |
2a31b9db | 3576 | #endif |
e5d83c74 PB |
3577 | default: |
3578 | return kvm_vm_ioctl_enable_cap(kvm, cap); | |
3579 | } | |
3580 | } | |
3581 | ||
bccf2150 AK |
3582 | static long kvm_vm_ioctl(struct file *filp, |
3583 | unsigned int ioctl, unsigned long arg) | |
3584 | { | |
3585 | struct kvm *kvm = filp->private_data; | |
3586 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 3587 | int r; |
bccf2150 | 3588 | |
6d4e4c4f AK |
3589 | if (kvm->mm != current->mm) |
3590 | return -EIO; | |
bccf2150 AK |
3591 | switch (ioctl) { |
3592 | case KVM_CREATE_VCPU: | |
3593 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 3594 | break; |
e5d83c74 PB |
3595 | case KVM_ENABLE_CAP: { |
3596 | struct kvm_enable_cap cap; | |
3597 | ||
3598 | r = -EFAULT; | |
3599 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
3600 | goto out; | |
3601 | r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap); | |
3602 | break; | |
3603 | } | |
6fc138d2 IE |
3604 | case KVM_SET_USER_MEMORY_REGION: { |
3605 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3606 | ||
3607 | r = -EFAULT; | |
3608 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 3609 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
3610 | goto out; |
3611 | ||
47ae31e2 | 3612 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
3613 | break; |
3614 | } | |
3615 | case KVM_GET_DIRTY_LOG: { | |
3616 | struct kvm_dirty_log log; | |
3617 | ||
3618 | r = -EFAULT; | |
893bdbf1 | 3619 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 3620 | goto out; |
2c6f5df9 | 3621 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
3622 | break; |
3623 | } | |
2a31b9db PB |
3624 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3625 | case KVM_CLEAR_DIRTY_LOG: { | |
3626 | struct kvm_clear_dirty_log log; | |
3627 | ||
3628 | r = -EFAULT; | |
3629 | if (copy_from_user(&log, argp, sizeof(log))) | |
3630 | goto out; | |
3631 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
3632 | break; | |
3633 | } | |
3634 | #endif | |
4b4357e0 | 3635 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3636 | case KVM_REGISTER_COALESCED_MMIO: { |
3637 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3638 | |
5f94c174 | 3639 | r = -EFAULT; |
893bdbf1 | 3640 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3641 | goto out; |
5f94c174 | 3642 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3643 | break; |
3644 | } | |
3645 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3646 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3647 | |
5f94c174 | 3648 | r = -EFAULT; |
893bdbf1 | 3649 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3650 | goto out; |
5f94c174 | 3651 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3652 | break; |
3653 | } | |
3654 | #endif | |
721eecbf GH |
3655 | case KVM_IRQFD: { |
3656 | struct kvm_irqfd data; | |
3657 | ||
3658 | r = -EFAULT; | |
893bdbf1 | 3659 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 3660 | goto out; |
d4db2935 | 3661 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
3662 | break; |
3663 | } | |
d34e6b17 GH |
3664 | case KVM_IOEVENTFD: { |
3665 | struct kvm_ioeventfd data; | |
3666 | ||
3667 | r = -EFAULT; | |
893bdbf1 | 3668 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
3669 | goto out; |
3670 | r = kvm_ioeventfd(kvm, &data); | |
3671 | break; | |
3672 | } | |
07975ad3 JK |
3673 | #ifdef CONFIG_HAVE_KVM_MSI |
3674 | case KVM_SIGNAL_MSI: { | |
3675 | struct kvm_msi msi; | |
3676 | ||
3677 | r = -EFAULT; | |
893bdbf1 | 3678 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
3679 | goto out; |
3680 | r = kvm_send_userspace_msi(kvm, &msi); | |
3681 | break; | |
3682 | } | |
23d43cf9 CD |
3683 | #endif |
3684 | #ifdef __KVM_HAVE_IRQ_LINE | |
3685 | case KVM_IRQ_LINE_STATUS: | |
3686 | case KVM_IRQ_LINE: { | |
3687 | struct kvm_irq_level irq_event; | |
3688 | ||
3689 | r = -EFAULT; | |
893bdbf1 | 3690 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
3691 | goto out; |
3692 | ||
aa2fbe6d YZ |
3693 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
3694 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
3695 | if (r) |
3696 | goto out; | |
3697 | ||
3698 | r = -EFAULT; | |
3699 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 3700 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
3701 | goto out; |
3702 | } | |
3703 | ||
3704 | r = 0; | |
3705 | break; | |
3706 | } | |
73880c80 | 3707 | #endif |
aa8d5944 AG |
3708 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3709 | case KVM_SET_GSI_ROUTING: { | |
3710 | struct kvm_irq_routing routing; | |
3711 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 3712 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
3713 | |
3714 | r = -EFAULT; | |
3715 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3716 | goto out; | |
3717 | r = -EINVAL; | |
5c0aea0e DH |
3718 | if (!kvm_arch_can_set_irq_routing(kvm)) |
3719 | goto out; | |
caf1ff26 | 3720 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
3721 | goto out; |
3722 | if (routing.flags) | |
3723 | goto out; | |
f8c1b85b PB |
3724 | if (routing.nr) { |
3725 | r = -ENOMEM; | |
42bc47b3 KC |
3726 | entries = vmalloc(array_size(sizeof(*entries), |
3727 | routing.nr)); | |
f8c1b85b PB |
3728 | if (!entries) |
3729 | goto out; | |
3730 | r = -EFAULT; | |
3731 | urouting = argp; | |
3732 | if (copy_from_user(entries, urouting->entries, | |
3733 | routing.nr * sizeof(*entries))) | |
3734 | goto out_free_irq_routing; | |
3735 | } | |
aa8d5944 AG |
3736 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
3737 | routing.flags); | |
a642a175 | 3738 | out_free_irq_routing: |
aa8d5944 AG |
3739 | vfree(entries); |
3740 | break; | |
3741 | } | |
3742 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
3743 | case KVM_CREATE_DEVICE: { |
3744 | struct kvm_create_device cd; | |
3745 | ||
3746 | r = -EFAULT; | |
3747 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3748 | goto out; | |
3749 | ||
3750 | r = kvm_ioctl_create_device(kvm, &cd); | |
3751 | if (r) | |
3752 | goto out; | |
3753 | ||
3754 | r = -EFAULT; | |
3755 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3756 | goto out; | |
3757 | ||
3758 | r = 0; | |
3759 | break; | |
3760 | } | |
92b591a4 AG |
3761 | case KVM_CHECK_EXTENSION: |
3762 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3763 | break; | |
f17abe9a | 3764 | default: |
1fe779f8 | 3765 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
3766 | } |
3767 | out: | |
3768 | return r; | |
3769 | } | |
3770 | ||
de8e5d74 | 3771 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
3772 | struct compat_kvm_dirty_log { |
3773 | __u32 slot; | |
3774 | __u32 padding1; | |
3775 | union { | |
3776 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3777 | __u64 padding2; | |
3778 | }; | |
3779 | }; | |
3780 | ||
3781 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3782 | unsigned int ioctl, unsigned long arg) | |
3783 | { | |
3784 | struct kvm *kvm = filp->private_data; | |
3785 | int r; | |
3786 | ||
3787 | if (kvm->mm != current->mm) | |
3788 | return -EIO; | |
3789 | switch (ioctl) { | |
3790 | case KVM_GET_DIRTY_LOG: { | |
3791 | struct compat_kvm_dirty_log compat_log; | |
3792 | struct kvm_dirty_log log; | |
3793 | ||
6ff5894c AB |
3794 | if (copy_from_user(&compat_log, (void __user *)arg, |
3795 | sizeof(compat_log))) | |
f6a3b168 | 3796 | return -EFAULT; |
6ff5894c AB |
3797 | log.slot = compat_log.slot; |
3798 | log.padding1 = compat_log.padding1; | |
3799 | log.padding2 = compat_log.padding2; | |
3800 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3801 | ||
3802 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
3803 | break; |
3804 | } | |
3805 | default: | |
3806 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3807 | } | |
6ff5894c AB |
3808 | return r; |
3809 | } | |
3810 | #endif | |
3811 | ||
3d3aab1b | 3812 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
3813 | .release = kvm_vm_release, |
3814 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 3815 | .llseek = noop_llseek, |
7ddfd3e0 | 3816 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
3817 | }; |
3818 | ||
e08b9637 | 3819 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 3820 | { |
aac87636 | 3821 | int r; |
f17abe9a | 3822 | struct kvm *kvm; |
506cfba9 | 3823 | struct file *file; |
f17abe9a | 3824 | |
e08b9637 | 3825 | kvm = kvm_create_vm(type); |
d6d28168 AK |
3826 | if (IS_ERR(kvm)) |
3827 | return PTR_ERR(kvm); | |
4b4357e0 | 3828 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 3829 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
3830 | if (r < 0) |
3831 | goto put_kvm; | |
6ce5a090 | 3832 | #endif |
506cfba9 | 3833 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
3834 | if (r < 0) |
3835 | goto put_kvm; | |
3836 | ||
506cfba9 AV |
3837 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
3838 | if (IS_ERR(file)) { | |
3839 | put_unused_fd(r); | |
78588335 ME |
3840 | r = PTR_ERR(file); |
3841 | goto put_kvm; | |
506cfba9 | 3842 | } |
536a6f88 | 3843 | |
525df861 PB |
3844 | /* |
3845 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3846 | * already set, with ->release() being kvm_vm_release(). In error | |
3847 | * cases it will be called by the final fput(file) and will take | |
3848 | * care of doing kvm_put_kvm(kvm). | |
3849 | */ | |
536a6f88 | 3850 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
3851 | put_unused_fd(r); |
3852 | fput(file); | |
536a6f88 JF |
3853 | return -ENOMEM; |
3854 | } | |
286de8f6 | 3855 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 3856 | |
506cfba9 | 3857 | fd_install(r, file); |
aac87636 | 3858 | return r; |
78588335 ME |
3859 | |
3860 | put_kvm: | |
3861 | kvm_put_kvm(kvm); | |
3862 | return r; | |
f17abe9a AK |
3863 | } |
3864 | ||
3865 | static long kvm_dev_ioctl(struct file *filp, | |
3866 | unsigned int ioctl, unsigned long arg) | |
3867 | { | |
07c45a36 | 3868 | long r = -EINVAL; |
f17abe9a AK |
3869 | |
3870 | switch (ioctl) { | |
3871 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
3872 | if (arg) |
3873 | goto out; | |
f17abe9a AK |
3874 | r = KVM_API_VERSION; |
3875 | break; | |
3876 | case KVM_CREATE_VM: | |
e08b9637 | 3877 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 3878 | break; |
018d00d2 | 3879 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 3880 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 3881 | break; |
07c45a36 | 3882 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
3883 | if (arg) |
3884 | goto out; | |
adb1ff46 AK |
3885 | r = PAGE_SIZE; /* struct kvm_run */ |
3886 | #ifdef CONFIG_X86 | |
3887 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 3888 | #endif |
4b4357e0 | 3889 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 3890 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 3891 | #endif |
07c45a36 | 3892 | break; |
d4c9ff2d FEL |
3893 | case KVM_TRACE_ENABLE: |
3894 | case KVM_TRACE_PAUSE: | |
3895 | case KVM_TRACE_DISABLE: | |
2023a29c | 3896 | r = -EOPNOTSUPP; |
d4c9ff2d | 3897 | break; |
6aa8b732 | 3898 | default: |
043405e1 | 3899 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3900 | } |
3901 | out: | |
3902 | return r; | |
3903 | } | |
3904 | ||
6aa8b732 | 3905 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 3906 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 3907 | .llseek = noop_llseek, |
7ddfd3e0 | 3908 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
3909 | }; |
3910 | ||
3911 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3912 | KVM_MINOR, |
6aa8b732 AK |
3913 | "kvm", |
3914 | &kvm_chardev_ops, | |
3915 | }; | |
3916 | ||
75b7127c | 3917 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3918 | { |
3919 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3920 | int r; |
1b6c0168 | 3921 | |
7f59f492 | 3922 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3923 | return; |
10474ae8 | 3924 | |
7f59f492 | 3925 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3926 | |
13a34e06 | 3927 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3928 | |
3929 | if (r) { | |
3930 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3931 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3932 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3933 | } |
1b6c0168 AK |
3934 | } |
3935 | ||
8c18b2d2 | 3936 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 3937 | { |
4a937f96 | 3938 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3939 | if (kvm_usage_count) |
3940 | hardware_enable_nolock(NULL); | |
4a937f96 | 3941 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3942 | return 0; |
75b7127c TY |
3943 | } |
3944 | ||
3945 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3946 | { |
3947 | int cpu = raw_smp_processor_id(); | |
3948 | ||
7f59f492 | 3949 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3950 | return; |
7f59f492 | 3951 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3952 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3953 | } |
3954 | ||
8c18b2d2 | 3955 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 3956 | { |
4a937f96 | 3957 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3958 | if (kvm_usage_count) |
3959 | hardware_disable_nolock(NULL); | |
4a937f96 | 3960 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3961 | return 0; |
75b7127c TY |
3962 | } |
3963 | ||
10474ae8 AG |
3964 | static void hardware_disable_all_nolock(void) |
3965 | { | |
3966 | BUG_ON(!kvm_usage_count); | |
3967 | ||
3968 | kvm_usage_count--; | |
3969 | if (!kvm_usage_count) | |
75b7127c | 3970 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3971 | } |
3972 | ||
3973 | static void hardware_disable_all(void) | |
3974 | { | |
4a937f96 | 3975 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3976 | hardware_disable_all_nolock(); |
4a937f96 | 3977 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3978 | } |
3979 | ||
3980 | static int hardware_enable_all(void) | |
3981 | { | |
3982 | int r = 0; | |
3983 | ||
4a937f96 | 3984 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3985 | |
3986 | kvm_usage_count++; | |
3987 | if (kvm_usage_count == 1) { | |
3988 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3989 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3990 | |
3991 | if (atomic_read(&hardware_enable_failed)) { | |
3992 | hardware_disable_all_nolock(); | |
3993 | r = -EBUSY; | |
3994 | } | |
3995 | } | |
3996 | ||
4a937f96 | 3997 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3998 | |
3999 | return r; | |
4000 | } | |
4001 | ||
9a2b85c6 | 4002 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 4003 | void *v) |
9a2b85c6 | 4004 | { |
8e1c1815 SY |
4005 | /* |
4006 | * Some (well, at least mine) BIOSes hang on reboot if | |
4007 | * in vmx root mode. | |
4008 | * | |
4009 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
4010 | */ | |
1170adc6 | 4011 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 4012 | kvm_rebooting = true; |
75b7127c | 4013 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
4014 | return NOTIFY_OK; |
4015 | } | |
4016 | ||
4017 | static struct notifier_block kvm_reboot_notifier = { | |
4018 | .notifier_call = kvm_reboot, | |
4019 | .priority = 0, | |
4020 | }; | |
4021 | ||
e93f8a0f | 4022 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
4023 | { |
4024 | int i; | |
4025 | ||
4026 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 4027 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
4028 | |
4029 | kvm_iodevice_destructor(pos); | |
4030 | } | |
e93f8a0f | 4031 | kfree(bus); |
2eeb2e94 GH |
4032 | } |
4033 | ||
c21fbff1 | 4034 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 4035 | const struct kvm_io_range *r2) |
743eeb0b | 4036 | { |
8f4216c7 JW |
4037 | gpa_t addr1 = r1->addr; |
4038 | gpa_t addr2 = r2->addr; | |
4039 | ||
4040 | if (addr1 < addr2) | |
743eeb0b | 4041 | return -1; |
8f4216c7 JW |
4042 | |
4043 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
4044 | * accept any overlapping write. Any order is acceptable for | |
4045 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
4046 | * we process all of them. | |
4047 | */ | |
4048 | if (r2->len) { | |
4049 | addr1 += r1->len; | |
4050 | addr2 += r2->len; | |
4051 | } | |
4052 | ||
4053 | if (addr1 > addr2) | |
743eeb0b | 4054 | return 1; |
8f4216c7 | 4055 | |
743eeb0b SL |
4056 | return 0; |
4057 | } | |
4058 | ||
a343c9b7 PB |
4059 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
4060 | { | |
c21fbff1 | 4061 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
4062 | } |
4063 | ||
39369f7a | 4064 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
4065 | gpa_t addr, int len) |
4066 | { | |
4067 | struct kvm_io_range *range, key; | |
4068 | int off; | |
4069 | ||
4070 | key = (struct kvm_io_range) { | |
4071 | .addr = addr, | |
4072 | .len = len, | |
4073 | }; | |
4074 | ||
4075 | range = bsearch(&key, bus->range, bus->dev_count, | |
4076 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
4077 | if (range == NULL) | |
4078 | return -ENOENT; | |
4079 | ||
4080 | off = range - bus->range; | |
4081 | ||
c21fbff1 | 4082 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
4083 | off--; |
4084 | ||
4085 | return off; | |
4086 | } | |
4087 | ||
e32edf4f | 4088 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
4089 | struct kvm_io_range *range, const void *val) |
4090 | { | |
4091 | int idx; | |
4092 | ||
4093 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
4094 | if (idx < 0) | |
4095 | return -EOPNOTSUPP; | |
4096 | ||
4097 | while (idx < bus->dev_count && | |
c21fbff1 | 4098 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 4099 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
4100 | range->len, val)) |
4101 | return idx; | |
4102 | idx++; | |
4103 | } | |
4104 | ||
4105 | return -EOPNOTSUPP; | |
4106 | } | |
4107 | ||
bda9020e | 4108 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 4109 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 4110 | int len, const void *val) |
2eeb2e94 | 4111 | { |
90d83dc3 | 4112 | struct kvm_io_bus *bus; |
743eeb0b | 4113 | struct kvm_io_range range; |
126a5af5 | 4114 | int r; |
743eeb0b SL |
4115 | |
4116 | range = (struct kvm_io_range) { | |
4117 | .addr = addr, | |
4118 | .len = len, | |
4119 | }; | |
90d83dc3 | 4120 | |
e32edf4f | 4121 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
4122 | if (!bus) |
4123 | return -ENOMEM; | |
e32edf4f | 4124 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
4125 | return r < 0 ? r : 0; |
4126 | } | |
a2420107 | 4127 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
126a5af5 CH |
4128 | |
4129 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
4130 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
4131 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
4132 | { |
4133 | struct kvm_io_bus *bus; | |
4134 | struct kvm_io_range range; | |
4135 | ||
4136 | range = (struct kvm_io_range) { | |
4137 | .addr = addr, | |
4138 | .len = len, | |
4139 | }; | |
4140 | ||
e32edf4f | 4141 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
4142 | if (!bus) |
4143 | return -ENOMEM; | |
126a5af5 CH |
4144 | |
4145 | /* First try the device referenced by cookie. */ | |
4146 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 4147 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 4148 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
4149 | val)) |
4150 | return cookie; | |
4151 | ||
4152 | /* | |
4153 | * cookie contained garbage; fall back to search and return the | |
4154 | * correct cookie value. | |
4155 | */ | |
e32edf4f | 4156 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
4157 | } |
4158 | ||
e32edf4f NN |
4159 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
4160 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
4161 | { |
4162 | int idx; | |
4163 | ||
4164 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
4165 | if (idx < 0) |
4166 | return -EOPNOTSUPP; | |
4167 | ||
4168 | while (idx < bus->dev_count && | |
c21fbff1 | 4169 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 4170 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
4171 | range->len, val)) |
4172 | return idx; | |
743eeb0b SL |
4173 | idx++; |
4174 | } | |
4175 | ||
bda9020e MT |
4176 | return -EOPNOTSUPP; |
4177 | } | |
2eeb2e94 | 4178 | |
bda9020e | 4179 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 4180 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 4181 | int len, void *val) |
bda9020e | 4182 | { |
90d83dc3 | 4183 | struct kvm_io_bus *bus; |
743eeb0b | 4184 | struct kvm_io_range range; |
126a5af5 | 4185 | int r; |
743eeb0b SL |
4186 | |
4187 | range = (struct kvm_io_range) { | |
4188 | .addr = addr, | |
4189 | .len = len, | |
4190 | }; | |
e93f8a0f | 4191 | |
e32edf4f | 4192 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
4193 | if (!bus) |
4194 | return -ENOMEM; | |
e32edf4f | 4195 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
4196 | return r < 0 ? r : 0; |
4197 | } | |
743eeb0b | 4198 | |
79fac95e | 4199 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
4200 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
4201 | int len, struct kvm_io_device *dev) | |
6c474694 | 4202 | { |
d4c67a7a | 4203 | int i; |
e93f8a0f | 4204 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 4205 | struct kvm_io_range range; |
090b7aff | 4206 | |
4a12f951 | 4207 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
4208 | if (!bus) |
4209 | return -ENOMEM; | |
4210 | ||
6ea34c9b AK |
4211 | /* exclude ioeventfd which is limited by maximum fd */ |
4212 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 4213 | return -ENOSPC; |
2eeb2e94 | 4214 | |
90952cd3 | 4215 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1), |
b12ce36a | 4216 | GFP_KERNEL_ACCOUNT); |
e93f8a0f MT |
4217 | if (!new_bus) |
4218 | return -ENOMEM; | |
d4c67a7a GH |
4219 | |
4220 | range = (struct kvm_io_range) { | |
4221 | .addr = addr, | |
4222 | .len = len, | |
4223 | .dev = dev, | |
4224 | }; | |
4225 | ||
4226 | for (i = 0; i < bus->dev_count; i++) | |
4227 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
4228 | break; | |
4229 | ||
4230 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
4231 | new_bus->dev_count++; | |
4232 | new_bus->range[i] = range; | |
4233 | memcpy(new_bus->range + i + 1, bus->range + i, | |
4234 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
4235 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
4236 | synchronize_srcu_expedited(&kvm->srcu); | |
4237 | kfree(bus); | |
090b7aff GH |
4238 | |
4239 | return 0; | |
4240 | } | |
4241 | ||
79fac95e | 4242 | /* Caller must hold slots_lock. */ |
90db1043 DH |
4243 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
4244 | struct kvm_io_device *dev) | |
090b7aff | 4245 | { |
90db1043 | 4246 | int i; |
e93f8a0f | 4247 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 4248 | |
4a12f951 | 4249 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 4250 | if (!bus) |
90db1043 | 4251 | return; |
df630b8c | 4252 | |
a1300716 AK |
4253 | for (i = 0; i < bus->dev_count; i++) |
4254 | if (bus->range[i].dev == dev) { | |
090b7aff GH |
4255 | break; |
4256 | } | |
e93f8a0f | 4257 | |
90db1043 DH |
4258 | if (i == bus->dev_count) |
4259 | return; | |
a1300716 | 4260 | |
90952cd3 | 4261 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1), |
b12ce36a | 4262 | GFP_KERNEL_ACCOUNT); |
90db1043 DH |
4263 | if (!new_bus) { |
4264 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
4265 | goto broken; | |
4266 | } | |
a1300716 AK |
4267 | |
4268 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
4269 | new_bus->dev_count--; | |
4270 | memcpy(new_bus->range + i, bus->range + i + 1, | |
4271 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f | 4272 | |
90db1043 | 4273 | broken: |
e93f8a0f MT |
4274 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
4275 | synchronize_srcu_expedited(&kvm->srcu); | |
4276 | kfree(bus); | |
90db1043 | 4277 | return; |
2eeb2e94 GH |
4278 | } |
4279 | ||
8a39d006 AP |
4280 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
4281 | gpa_t addr) | |
4282 | { | |
4283 | struct kvm_io_bus *bus; | |
4284 | int dev_idx, srcu_idx; | |
4285 | struct kvm_io_device *iodev = NULL; | |
4286 | ||
4287 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
4288 | ||
4289 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
4290 | if (!bus) |
4291 | goto out_unlock; | |
8a39d006 AP |
4292 | |
4293 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
4294 | if (dev_idx < 0) | |
4295 | goto out_unlock; | |
4296 | ||
4297 | iodev = bus->range[dev_idx].dev; | |
4298 | ||
4299 | out_unlock: | |
4300 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
4301 | ||
4302 | return iodev; | |
4303 | } | |
4304 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
4305 | ||
536a6f88 JF |
4306 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
4307 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
4308 | const char *fmt) | |
4309 | { | |
4310 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
4311 | inode->i_private; | |
4312 | ||
4313 | /* The debugfs files are a reference to the kvm struct which | |
4314 | * is still valid when kvm_destroy_vm is called. | |
4315 | * To avoid the race between open and the removal of the debugfs | |
4316 | * directory we test against the users count. | |
4317 | */ | |
e3736c3e | 4318 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) |
536a6f88 JF |
4319 | return -ENOENT; |
4320 | ||
833b45de | 4321 | if (simple_attr_open(inode, file, get, |
09cbcef6 MP |
4322 | KVM_DBGFS_GET_MODE(stat_data->dbgfs_item) & 0222 |
4323 | ? set : NULL, | |
4324 | fmt)) { | |
536a6f88 JF |
4325 | kvm_put_kvm(stat_data->kvm); |
4326 | return -ENOMEM; | |
4327 | } | |
4328 | ||
4329 | return 0; | |
4330 | } | |
4331 | ||
4332 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
4333 | { | |
4334 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
4335 | inode->i_private; | |
4336 | ||
4337 | simple_attr_release(inode, file); | |
4338 | kvm_put_kvm(stat_data->kvm); | |
4339 | ||
4340 | return 0; | |
4341 | } | |
4342 | ||
09cbcef6 | 4343 | static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val) |
536a6f88 | 4344 | { |
09cbcef6 | 4345 | *val = *(ulong *)((void *)kvm + offset); |
536a6f88 | 4346 | |
09cbcef6 MP |
4347 | return 0; |
4348 | } | |
4349 | ||
4350 | static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset) | |
4351 | { | |
4352 | *(ulong *)((void *)kvm + offset) = 0; | |
536a6f88 JF |
4353 | |
4354 | return 0; | |
4355 | } | |
4356 | ||
09cbcef6 | 4357 | static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val) |
ce35ef27 | 4358 | { |
09cbcef6 MP |
4359 | int i; |
4360 | struct kvm_vcpu *vcpu; | |
ce35ef27 | 4361 | |
09cbcef6 | 4362 | *val = 0; |
ce35ef27 | 4363 | |
09cbcef6 MP |
4364 | kvm_for_each_vcpu(i, vcpu, kvm) |
4365 | *val += *(u64 *)((void *)vcpu + offset); | |
ce35ef27 SJS |
4366 | |
4367 | return 0; | |
4368 | } | |
4369 | ||
09cbcef6 | 4370 | static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset) |
536a6f88 | 4371 | { |
09cbcef6 MP |
4372 | int i; |
4373 | struct kvm_vcpu *vcpu; | |
536a6f88 | 4374 | |
09cbcef6 MP |
4375 | kvm_for_each_vcpu(i, vcpu, kvm) |
4376 | *(u64 *)((void *)vcpu + offset) = 0; | |
4377 | ||
4378 | return 0; | |
4379 | } | |
536a6f88 | 4380 | |
09cbcef6 | 4381 | static int kvm_stat_data_get(void *data, u64 *val) |
536a6f88 | 4382 | { |
09cbcef6 | 4383 | int r = -EFAULT; |
536a6f88 | 4384 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
536a6f88 | 4385 | |
09cbcef6 MP |
4386 | switch (stat_data->dbgfs_item->kind) { |
4387 | case KVM_STAT_VM: | |
4388 | r = kvm_get_stat_per_vm(stat_data->kvm, | |
4389 | stat_data->dbgfs_item->offset, val); | |
4390 | break; | |
4391 | case KVM_STAT_VCPU: | |
4392 | r = kvm_get_stat_per_vcpu(stat_data->kvm, | |
4393 | stat_data->dbgfs_item->offset, val); | |
4394 | break; | |
4395 | } | |
536a6f88 | 4396 | |
09cbcef6 | 4397 | return r; |
536a6f88 JF |
4398 | } |
4399 | ||
09cbcef6 | 4400 | static int kvm_stat_data_clear(void *data, u64 val) |
ce35ef27 | 4401 | { |
09cbcef6 | 4402 | int r = -EFAULT; |
ce35ef27 | 4403 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
ce35ef27 SJS |
4404 | |
4405 | if (val) | |
4406 | return -EINVAL; | |
4407 | ||
09cbcef6 MP |
4408 | switch (stat_data->dbgfs_item->kind) { |
4409 | case KVM_STAT_VM: | |
4410 | r = kvm_clear_stat_per_vm(stat_data->kvm, | |
4411 | stat_data->dbgfs_item->offset); | |
4412 | break; | |
4413 | case KVM_STAT_VCPU: | |
4414 | r = kvm_clear_stat_per_vcpu(stat_data->kvm, | |
4415 | stat_data->dbgfs_item->offset); | |
4416 | break; | |
4417 | } | |
ce35ef27 | 4418 | |
09cbcef6 | 4419 | return r; |
ce35ef27 SJS |
4420 | } |
4421 | ||
09cbcef6 | 4422 | static int kvm_stat_data_open(struct inode *inode, struct file *file) |
536a6f88 JF |
4423 | { |
4424 | __simple_attr_check_format("%llu\n", 0ull); | |
09cbcef6 MP |
4425 | return kvm_debugfs_open(inode, file, kvm_stat_data_get, |
4426 | kvm_stat_data_clear, "%llu\n"); | |
536a6f88 JF |
4427 | } |
4428 | ||
09cbcef6 MP |
4429 | static const struct file_operations stat_fops_per_vm = { |
4430 | .owner = THIS_MODULE, | |
4431 | .open = kvm_stat_data_open, | |
536a6f88 | 4432 | .release = kvm_debugfs_release, |
09cbcef6 MP |
4433 | .read = simple_attr_read, |
4434 | .write = simple_attr_write, | |
4435 | .llseek = no_llseek, | |
536a6f88 JF |
4436 | }; |
4437 | ||
8b88b099 | 4438 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
4439 | { |
4440 | unsigned offset = (long)_offset; | |
ba1389b7 | 4441 | struct kvm *kvm; |
536a6f88 | 4442 | u64 tmp_val; |
ba1389b7 | 4443 | |
8b88b099 | 4444 | *val = 0; |
0d9ce162 | 4445 | mutex_lock(&kvm_lock); |
536a6f88 | 4446 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4447 | kvm_get_stat_per_vm(kvm, offset, &tmp_val); |
536a6f88 JF |
4448 | *val += tmp_val; |
4449 | } | |
0d9ce162 | 4450 | mutex_unlock(&kvm_lock); |
8b88b099 | 4451 | return 0; |
ba1389b7 AK |
4452 | } |
4453 | ||
ce35ef27 SJS |
4454 | static int vm_stat_clear(void *_offset, u64 val) |
4455 | { | |
4456 | unsigned offset = (long)_offset; | |
4457 | struct kvm *kvm; | |
ce35ef27 SJS |
4458 | |
4459 | if (val) | |
4460 | return -EINVAL; | |
4461 | ||
0d9ce162 | 4462 | mutex_lock(&kvm_lock); |
ce35ef27 | 4463 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4464 | kvm_clear_stat_per_vm(kvm, offset); |
ce35ef27 | 4465 | } |
0d9ce162 | 4466 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4467 | |
4468 | return 0; | |
4469 | } | |
4470 | ||
4471 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
ba1389b7 | 4472 | |
8b88b099 | 4473 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
4474 | { |
4475 | unsigned offset = (long)_offset; | |
1165f5fe | 4476 | struct kvm *kvm; |
536a6f88 | 4477 | u64 tmp_val; |
1165f5fe | 4478 | |
8b88b099 | 4479 | *val = 0; |
0d9ce162 | 4480 | mutex_lock(&kvm_lock); |
536a6f88 | 4481 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4482 | kvm_get_stat_per_vcpu(kvm, offset, &tmp_val); |
536a6f88 JF |
4483 | *val += tmp_val; |
4484 | } | |
0d9ce162 | 4485 | mutex_unlock(&kvm_lock); |
8b88b099 | 4486 | return 0; |
1165f5fe AK |
4487 | } |
4488 | ||
ce35ef27 SJS |
4489 | static int vcpu_stat_clear(void *_offset, u64 val) |
4490 | { | |
4491 | unsigned offset = (long)_offset; | |
4492 | struct kvm *kvm; | |
ce35ef27 SJS |
4493 | |
4494 | if (val) | |
4495 | return -EINVAL; | |
4496 | ||
0d9ce162 | 4497 | mutex_lock(&kvm_lock); |
ce35ef27 | 4498 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4499 | kvm_clear_stat_per_vcpu(kvm, offset); |
ce35ef27 | 4500 | } |
0d9ce162 | 4501 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4502 | |
4503 | return 0; | |
4504 | } | |
4505 | ||
4506 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
4507 | "%llu\n"); | |
ba1389b7 | 4508 | |
828c0950 | 4509 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
4510 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
4511 | [KVM_STAT_VM] = &vm_stat_fops, | |
4512 | }; | |
1165f5fe | 4513 | |
286de8f6 CI |
4514 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
4515 | { | |
4516 | struct kobj_uevent_env *env; | |
286de8f6 CI |
4517 | unsigned long long created, active; |
4518 | ||
4519 | if (!kvm_dev.this_device || !kvm) | |
4520 | return; | |
4521 | ||
0d9ce162 | 4522 | mutex_lock(&kvm_lock); |
286de8f6 CI |
4523 | if (type == KVM_EVENT_CREATE_VM) { |
4524 | kvm_createvm_count++; | |
4525 | kvm_active_vms++; | |
4526 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
4527 | kvm_active_vms--; | |
4528 | } | |
4529 | created = kvm_createvm_count; | |
4530 | active = kvm_active_vms; | |
0d9ce162 | 4531 | mutex_unlock(&kvm_lock); |
286de8f6 | 4532 | |
b12ce36a | 4533 | env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT); |
286de8f6 CI |
4534 | if (!env) |
4535 | return; | |
4536 | ||
4537 | add_uevent_var(env, "CREATED=%llu", created); | |
4538 | add_uevent_var(env, "COUNT=%llu", active); | |
4539 | ||
fdeaf7e3 | 4540 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 4541 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
4542 | kvm->userspace_pid = task_pid_nr(current); |
4543 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 4544 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
4545 | } |
4546 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 | 4547 | |
8ed0579c | 4548 | if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) { |
b12ce36a | 4549 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); |
fdeaf7e3 CI |
4550 | |
4551 | if (p) { | |
4552 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
4553 | if (!IS_ERR(tmp)) | |
4554 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
4555 | kfree(p); | |
286de8f6 CI |
4556 | } |
4557 | } | |
4558 | /* no need for checks, since we are adding at most only 5 keys */ | |
4559 | env->envp[env->envp_idx++] = NULL; | |
4560 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
4561 | kfree(env); | |
286de8f6 CI |
4562 | } |
4563 | ||
929f45e3 | 4564 | static void kvm_init_debug(void) |
6aa8b732 AK |
4565 | { |
4566 | struct kvm_stats_debugfs_item *p; | |
4567 | ||
76f7c879 | 4568 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 4569 | |
536a6f88 JF |
4570 | kvm_debugfs_num_entries = 0; |
4571 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
09cbcef6 MP |
4572 | debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p), |
4573 | kvm_debugfs_dir, (void *)(long)p->offset, | |
929f45e3 | 4574 | stat_fops[p->kind]); |
4f69b680 | 4575 | } |
6aa8b732 AK |
4576 | } |
4577 | ||
fb3600cc | 4578 | static int kvm_suspend(void) |
59ae6c6b | 4579 | { |
10474ae8 | 4580 | if (kvm_usage_count) |
75b7127c | 4581 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
4582 | return 0; |
4583 | } | |
4584 | ||
fb3600cc | 4585 | static void kvm_resume(void) |
59ae6c6b | 4586 | { |
ca84d1a2 | 4587 | if (kvm_usage_count) { |
2eb06c30 WL |
4588 | #ifdef CONFIG_LOCKDEP |
4589 | WARN_ON(lockdep_is_held(&kvm_count_lock)); | |
4590 | #endif | |
75b7127c | 4591 | hardware_enable_nolock(NULL); |
ca84d1a2 | 4592 | } |
59ae6c6b AK |
4593 | } |
4594 | ||
fb3600cc | 4595 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
4596 | .suspend = kvm_suspend, |
4597 | .resume = kvm_resume, | |
4598 | }; | |
4599 | ||
15ad7146 AK |
4600 | static inline |
4601 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
4602 | { | |
4603 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
4604 | } | |
4605 | ||
4606 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
4607 | { | |
4608 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 4609 | |
046ddeed | 4610 | WRITE_ONCE(vcpu->preempted, false); |
d73eb57b | 4611 | WRITE_ONCE(vcpu->ready, false); |
15ad7146 | 4612 | |
7495e22b | 4613 | __this_cpu_write(kvm_running_vcpu, vcpu); |
e790d9ef | 4614 | kvm_arch_sched_in(vcpu, cpu); |
e9b11c17 | 4615 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
4616 | } |
4617 | ||
4618 | static void kvm_sched_out(struct preempt_notifier *pn, | |
4619 | struct task_struct *next) | |
4620 | { | |
4621 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4622 | ||
d73eb57b | 4623 | if (current->state == TASK_RUNNING) { |
046ddeed | 4624 | WRITE_ONCE(vcpu->preempted, true); |
d73eb57b WL |
4625 | WRITE_ONCE(vcpu->ready, true); |
4626 | } | |
e9b11c17 | 4627 | kvm_arch_vcpu_put(vcpu); |
7495e22b PB |
4628 | __this_cpu_write(kvm_running_vcpu, NULL); |
4629 | } | |
4630 | ||
4631 | /** | |
4632 | * kvm_get_running_vcpu - get the vcpu running on the current CPU. | |
1f03b2bc MZ |
4633 | * |
4634 | * We can disable preemption locally around accessing the per-CPU variable, | |
4635 | * and use the resolved vcpu pointer after enabling preemption again, | |
4636 | * because even if the current thread is migrated to another CPU, reading | |
4637 | * the per-CPU value later will give us the same value as we update the | |
4638 | * per-CPU variable in the preempt notifier handlers. | |
7495e22b PB |
4639 | */ |
4640 | struct kvm_vcpu *kvm_get_running_vcpu(void) | |
4641 | { | |
1f03b2bc MZ |
4642 | struct kvm_vcpu *vcpu; |
4643 | ||
4644 | preempt_disable(); | |
4645 | vcpu = __this_cpu_read(kvm_running_vcpu); | |
4646 | preempt_enable(); | |
4647 | ||
4648 | return vcpu; | |
7495e22b PB |
4649 | } |
4650 | ||
4651 | /** | |
4652 | * kvm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
4653 | */ | |
4654 | struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) | |
4655 | { | |
4656 | return &kvm_running_vcpu; | |
15ad7146 AK |
4657 | } |
4658 | ||
b9904085 SC |
4659 | struct kvm_cpu_compat_check { |
4660 | void *opaque; | |
4661 | int *ret; | |
4662 | }; | |
4663 | ||
4664 | static void check_processor_compat(void *data) | |
f257d6dc | 4665 | { |
b9904085 SC |
4666 | struct kvm_cpu_compat_check *c = data; |
4667 | ||
4668 | *c->ret = kvm_arch_check_processor_compat(c->opaque); | |
f257d6dc SC |
4669 | } |
4670 | ||
0ee75bea | 4671 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 4672 | struct module *module) |
6aa8b732 | 4673 | { |
b9904085 | 4674 | struct kvm_cpu_compat_check c; |
6aa8b732 | 4675 | int r; |
002c7f7c | 4676 | int cpu; |
6aa8b732 | 4677 | |
f8c16bba ZX |
4678 | r = kvm_arch_init(opaque); |
4679 | if (r) | |
d2308784 | 4680 | goto out_fail; |
cb498ea2 | 4681 | |
7dac16c3 AH |
4682 | /* |
4683 | * kvm_arch_init makes sure there's at most one caller | |
4684 | * for architectures that support multiple implementations, | |
4685 | * like intel and amd on x86. | |
36343f6e PB |
4686 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
4687 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 4688 | */ |
36343f6e PB |
4689 | r = kvm_irqfd_init(); |
4690 | if (r) | |
4691 | goto out_irqfd; | |
7dac16c3 | 4692 | |
8437a617 | 4693 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
4694 | r = -ENOMEM; |
4695 | goto out_free_0; | |
4696 | } | |
4697 | ||
b9904085 | 4698 | r = kvm_arch_hardware_setup(opaque); |
6aa8b732 | 4699 | if (r < 0) |
faf0be22 | 4700 | goto out_free_1; |
6aa8b732 | 4701 | |
b9904085 SC |
4702 | c.ret = &r; |
4703 | c.opaque = opaque; | |
002c7f7c | 4704 | for_each_online_cpu(cpu) { |
b9904085 | 4705 | smp_call_function_single(cpu, check_processor_compat, &c, 1); |
002c7f7c | 4706 | if (r < 0) |
faf0be22 | 4707 | goto out_free_2; |
002c7f7c YS |
4708 | } |
4709 | ||
73c1b41e | 4710 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 4711 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 4712 | if (r) |
d2308784 | 4713 | goto out_free_2; |
6aa8b732 AK |
4714 | register_reboot_notifier(&kvm_reboot_notifier); |
4715 | ||
c16f862d | 4716 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
4717 | if (!vcpu_align) |
4718 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
4719 | kvm_vcpu_cache = |
4720 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
4721 | SLAB_ACCOUNT, | |
4722 | offsetof(struct kvm_vcpu, arch), | |
4723 | sizeof_field(struct kvm_vcpu, arch), | |
4724 | NULL); | |
c16f862d RR |
4725 | if (!kvm_vcpu_cache) { |
4726 | r = -ENOMEM; | |
fb3600cc | 4727 | goto out_free_3; |
c16f862d RR |
4728 | } |
4729 | ||
af585b92 GN |
4730 | r = kvm_async_pf_init(); |
4731 | if (r) | |
4732 | goto out_free; | |
4733 | ||
6aa8b732 | 4734 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
4735 | kvm_vm_fops.owner = module; |
4736 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
4737 | |
4738 | r = misc_register(&kvm_dev); | |
4739 | if (r) { | |
1170adc6 | 4740 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 4741 | goto out_unreg; |
6aa8b732 AK |
4742 | } |
4743 | ||
fb3600cc RW |
4744 | register_syscore_ops(&kvm_syscore_ops); |
4745 | ||
15ad7146 AK |
4746 | kvm_preempt_ops.sched_in = kvm_sched_in; |
4747 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4748 | ||
929f45e3 | 4749 | kvm_init_debug(); |
0ea4ed8e | 4750 | |
3c3c29fd PB |
4751 | r = kvm_vfio_ops_init(); |
4752 | WARN_ON(r); | |
4753 | ||
c7addb90 | 4754 | return 0; |
6aa8b732 | 4755 | |
af585b92 GN |
4756 | out_unreg: |
4757 | kvm_async_pf_deinit(); | |
6aa8b732 | 4758 | out_free: |
c16f862d | 4759 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 4760 | out_free_3: |
6aa8b732 | 4761 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4762 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 4763 | out_free_2: |
e9b11c17 | 4764 | kvm_arch_hardware_unsetup(); |
faf0be22 | 4765 | out_free_1: |
7f59f492 | 4766 | free_cpumask_var(cpus_hardware_enabled); |
d2308784 | 4767 | out_free_0: |
a0f155e9 | 4768 | kvm_irqfd_exit(); |
36343f6e | 4769 | out_irqfd: |
7dac16c3 AH |
4770 | kvm_arch_exit(); |
4771 | out_fail: | |
6aa8b732 AK |
4772 | return r; |
4773 | } | |
cb498ea2 | 4774 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 4775 | |
cb498ea2 | 4776 | void kvm_exit(void) |
6aa8b732 | 4777 | { |
4bd33b56 | 4778 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 4779 | misc_deregister(&kvm_dev); |
c16f862d | 4780 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 4781 | kvm_async_pf_deinit(); |
fb3600cc | 4782 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 4783 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4784 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 4785 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 4786 | kvm_arch_hardware_unsetup(); |
f8c16bba | 4787 | kvm_arch_exit(); |
a0f155e9 | 4788 | kvm_irqfd_exit(); |
7f59f492 | 4789 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 4790 | kvm_vfio_ops_exit(); |
6aa8b732 | 4791 | } |
cb498ea2 | 4792 | EXPORT_SYMBOL_GPL(kvm_exit); |
c57c8046 JS |
4793 | |
4794 | struct kvm_vm_worker_thread_context { | |
4795 | struct kvm *kvm; | |
4796 | struct task_struct *parent; | |
4797 | struct completion init_done; | |
4798 | kvm_vm_thread_fn_t thread_fn; | |
4799 | uintptr_t data; | |
4800 | int err; | |
4801 | }; | |
4802 | ||
4803 | static int kvm_vm_worker_thread(void *context) | |
4804 | { | |
4805 | /* | |
4806 | * The init_context is allocated on the stack of the parent thread, so | |
4807 | * we have to locally copy anything that is needed beyond initialization | |
4808 | */ | |
4809 | struct kvm_vm_worker_thread_context *init_context = context; | |
4810 | struct kvm *kvm = init_context->kvm; | |
4811 | kvm_vm_thread_fn_t thread_fn = init_context->thread_fn; | |
4812 | uintptr_t data = init_context->data; | |
4813 | int err; | |
4814 | ||
4815 | err = kthread_park(current); | |
4816 | /* kthread_park(current) is never supposed to return an error */ | |
4817 | WARN_ON(err != 0); | |
4818 | if (err) | |
4819 | goto init_complete; | |
4820 | ||
4821 | err = cgroup_attach_task_all(init_context->parent, current); | |
4822 | if (err) { | |
4823 | kvm_err("%s: cgroup_attach_task_all failed with err %d\n", | |
4824 | __func__, err); | |
4825 | goto init_complete; | |
4826 | } | |
4827 | ||
4828 | set_user_nice(current, task_nice(init_context->parent)); | |
4829 | ||
4830 | init_complete: | |
4831 | init_context->err = err; | |
4832 | complete(&init_context->init_done); | |
4833 | init_context = NULL; | |
4834 | ||
4835 | if (err) | |
4836 | return err; | |
4837 | ||
4838 | /* Wait to be woken up by the spawner before proceeding. */ | |
4839 | kthread_parkme(); | |
4840 | ||
4841 | if (!kthread_should_stop()) | |
4842 | err = thread_fn(kvm, data); | |
4843 | ||
4844 | return err; | |
4845 | } | |
4846 | ||
4847 | int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn, | |
4848 | uintptr_t data, const char *name, | |
4849 | struct task_struct **thread_ptr) | |
4850 | { | |
4851 | struct kvm_vm_worker_thread_context init_context = {}; | |
4852 | struct task_struct *thread; | |
4853 | ||
4854 | *thread_ptr = NULL; | |
4855 | init_context.kvm = kvm; | |
4856 | init_context.parent = current; | |
4857 | init_context.thread_fn = thread_fn; | |
4858 | init_context.data = data; | |
4859 | init_completion(&init_context.init_done); | |
4860 | ||
4861 | thread = kthread_run(kvm_vm_worker_thread, &init_context, | |
4862 | "%s-%d", name, task_pid_nr(current)); | |
4863 | if (IS_ERR(thread)) | |
4864 | return PTR_ERR(thread); | |
4865 | ||
4866 | /* kthread_run is never supposed to return NULL */ | |
4867 | WARN_ON(thread == NULL); | |
4868 | ||
4869 | wait_for_completion(&init_context.init_done); | |
4870 | ||
4871 | if (!init_context.err) | |
4872 | *thread_ptr = thread; | |
4873 | ||
4874 | return init_context.err; | |
4875 | } |