1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
9 *
10 * Authors:
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
13 *
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
16 *
17 */
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
26 #include <linux/mm.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched/signal.h>
36 #include <linux/sched/mm.h>
37 #include <linux/sched/stat.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41 #include <linux/profile.h>
42 #include <linux/kvm_para.h>
43 #include <linux/pagemap.h>
44 #include <linux/mman.h>
45 #include <linux/swap.h>
46 #include <linux/bitops.h>
47 #include <linux/spinlock.h>
48 #include <linux/compat.h>
49 #include <linux/srcu.h>
50 #include <linux/hugetlb.h>
51 #include <linux/slab.h>
52 #include <linux/sort.h>
53 #include <linux/bsearch.h>
55 #include <asm/processor.h>
56 #include <asm/io.h>
57 #include <asm/ioctl.h>
58 #include <linux/uaccess.h>
59 #include <asm/pgtable.h>
61 #include "coalesced_mmio.h"
62 #include "async_pf.h"
63 #include "vfio.h"
65 #define CREATE_TRACE_POINTS
66 #include <trace/events/kvm.h>
68 /* Worst case buffer size needed for holding an integer. */
69 #define ITOA_MAX_LEN 12
71 MODULE_AUTHOR("Qumranet");
72 MODULE_LICENSE("GPL");
74 /* Architectures should define their poll value according to the halt latency */
75 unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
76 module_param(halt_poll_ns, uint, 0644);
77 EXPORT_SYMBOL_GPL(halt_poll_ns);
79 /* Default doubles per-vcpu halt_poll_ns. */
80 unsigned int halt_poll_ns_grow = 2;
81 module_param(halt_poll_ns_grow, uint, 0644);
82 EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
84 /* Default resets per-vcpu halt_poll_ns . */
85 unsigned int halt_poll_ns_shrink;
86 module_param(halt_poll_ns_shrink, uint, 0644);
87 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
89 /*
90 * Ordering of locks:
91 *
92 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
93 */
95 DEFINE_SPINLOCK(kvm_lock);
96 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
97 LIST_HEAD(vm_list);
99 static cpumask_var_t cpus_hardware_enabled;
100 static int kvm_usage_count;
101 static atomic_t hardware_enable_failed;
103 struct kmem_cache *kvm_vcpu_cache;
104 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
106 static __read_mostly struct preempt_ops kvm_preempt_ops;
108 struct dentry *kvm_debugfs_dir;
109 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
111 static int kvm_debugfs_num_entries;
112 static const struct file_operations *stat_fops_per_vm[];
114 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
115 unsigned long arg);
116 #ifdef CONFIG_KVM_COMPAT
117 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
118 unsigned long arg);
119 #define KVM_COMPAT(c) .compat_ioctl = (c)
120 #else
121 static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl,
122 unsigned long arg) { return -EINVAL; }
123 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl
124 #endif
125 static int hardware_enable_all(void);
126 static void hardware_disable_all(void);
128 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
130 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
132 __visible bool kvm_rebooting;
133 EXPORT_SYMBOL_GPL(kvm_rebooting);
135 static bool largepages_enabled = true;
137 #define KVM_EVENT_CREATE_VM 0
138 #define KVM_EVENT_DESTROY_VM 1
139 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
140 static unsigned long long kvm_createvm_count;
141 static unsigned long long kvm_active_vms;
143 __weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
144 unsigned long start, unsigned long end)
145 {
146 }
148 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
149 {
150 if (pfn_valid(pfn))
151 return PageReserved(pfn_to_page(pfn));
153 return true;
154 }
156 /*
157 * Switches to specified vcpu, until a matching vcpu_put()
158 */
159 void vcpu_load(struct kvm_vcpu *vcpu)
160 {
161 int cpu = get_cpu();
162 preempt_notifier_register(&vcpu->preempt_notifier);
163 kvm_arch_vcpu_load(vcpu, cpu);
164 put_cpu();
165 }
166 EXPORT_SYMBOL_GPL(vcpu_load);
168 void vcpu_put(struct kvm_vcpu *vcpu)
169 {
170 preempt_disable();
171 kvm_arch_vcpu_put(vcpu);
172 preempt_notifier_unregister(&vcpu->preempt_notifier);
173 preempt_enable();
174 }
175 EXPORT_SYMBOL_GPL(vcpu_put);
177 /* TODO: merge with kvm_arch_vcpu_should_kick */
178 static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
179 {
180 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
182 /*
183 * We need to wait for the VCPU to reenable interrupts and get out of
184 * READING_SHADOW_PAGE_TABLES mode.
185 */
186 if (req & KVM_REQUEST_WAIT)
187 return mode != OUTSIDE_GUEST_MODE;
189 /*
190 * Need to kick a running VCPU, but otherwise there is nothing to do.
191 */
192 return mode == IN_GUEST_MODE;
193 }
195 static void ack_flush(void *_completed)
196 {
197 }
199 static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
200 {
201 if (unlikely(!cpus))
202 cpus = cpu_online_mask;
204 if (cpumask_empty(cpus))
205 return false;
207 smp_call_function_many(cpus, ack_flush, NULL, wait);
208 return true;
209 }
211 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
212 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
213 {
214 int i, cpu, me;
215 struct kvm_vcpu *vcpu;
216 bool called;
218 me = get_cpu();
220 kvm_for_each_vcpu(i, vcpu, kvm) {
221 if (!test_bit(i, vcpu_bitmap))
222 continue;
224 kvm_make_request(req, vcpu);
225 cpu = vcpu->cpu;
227 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
228 continue;
230 if (tmp != NULL && cpu != -1 && cpu != me &&
231 kvm_request_needs_ipi(vcpu, req))
232 __cpumask_set_cpu(cpu, tmp);
233 }
235 called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
236 put_cpu();
238 return called;
239 }
241 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
242 {
243 cpumask_var_t cpus;
244 bool called;
245 static unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]
246 = {[0 ... BITS_TO_LONGS(KVM_MAX_VCPUS)-1] = ULONG_MAX};
248 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
250 called = kvm_make_vcpus_request_mask(kvm, req, vcpu_bitmap, cpus);
252 free_cpumask_var(cpus);
253 return called;
254 }
256 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
257 void kvm_flush_remote_tlbs(struct kvm *kvm)
258 {
259 /*
260 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
261 * kvm_make_all_cpus_request.
262 */
263 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
265 /*
266 * We want to publish modifications to the page tables before reading
267 * mode. Pairs with a memory barrier in arch-specific code.
268 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
269 * and smp_mb in walk_shadow_page_lockless_begin/end.
270 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
271 *
272 * There is already an smp_mb__after_atomic() before
273 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
274 * barrier here.
275 */
276 if (!kvm_arch_flush_remote_tlb(kvm)
277 || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
278 ++kvm->stat.remote_tlb_flush;
279 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
280 }
281 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
282 #endif
284 void kvm_reload_remote_mmus(struct kvm *kvm)
285 {
286 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
287 }
289 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
290 {
291 struct page *page;
292 int r;
294 mutex_init(&vcpu->mutex);
295 vcpu->cpu = -1;
296 vcpu->kvm = kvm;
297 vcpu->vcpu_id = id;
298 vcpu->pid = NULL;
299 init_swait_queue_head(&vcpu->wq);
300 kvm_async_pf_vcpu_init(vcpu);
302 vcpu->pre_pcpu = -1;
303 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
305 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
306 if (!page) {
307 r = -ENOMEM;
308 goto fail;
309 }
310 vcpu->run = page_address(page);
312 kvm_vcpu_set_in_spin_loop(vcpu, false);
313 kvm_vcpu_set_dy_eligible(vcpu, false);
314 vcpu->preempted = false;
316 r = kvm_arch_vcpu_init(vcpu);
317 if (r < 0)
318 goto fail_free_run;
319 return 0;
321 fail_free_run:
322 free_page((unsigned long)vcpu->run);
323 fail:
324 return r;
325 }
326 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
328 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
329 {
330 /*
331 * no need for rcu_read_lock as VCPU_RUN is the only place that
332 * will change the vcpu->pid pointer and on uninit all file
333 * descriptors are already gone.
334 */
335 put_pid(rcu_dereference_protected(vcpu->pid, 1));
336 kvm_arch_vcpu_uninit(vcpu);
337 free_page((unsigned long)vcpu->run);
338 }
339 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
341 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
342 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
343 {
344 return container_of(mn, struct kvm, mmu_notifier);
345 }
347 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
348 struct mm_struct *mm,
349 unsigned long address,
350 pte_t pte)
351 {
352 struct kvm *kvm = mmu_notifier_to_kvm(mn);
353 int idx;
355 idx = srcu_read_lock(&kvm->srcu);
356 spin_lock(&kvm->mmu_lock);
357 kvm->mmu_notifier_seq++;
358 kvm_set_spte_hva(kvm, address, pte);
359 spin_unlock(&kvm->mmu_lock);
360 srcu_read_unlock(&kvm->srcu, idx);
361 }
363 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
364 struct mm_struct *mm,
365 unsigned long start,
366 unsigned long end)
367 {
368 struct kvm *kvm = mmu_notifier_to_kvm(mn);
369 int need_tlb_flush = 0, idx;
371 idx = srcu_read_lock(&kvm->srcu);
372 spin_lock(&kvm->mmu_lock);
373 /*
374 * The count increase must become visible at unlock time as no
375 * spte can be established without taking the mmu_lock and
376 * count is also read inside the mmu_lock critical section.
377 */
378 kvm->mmu_notifier_count++;
379 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
380 need_tlb_flush |= kvm->tlbs_dirty;
381 /* we've to flush the tlb before the pages can be freed */
382 if (need_tlb_flush)
383 kvm_flush_remote_tlbs(kvm);
385 spin_unlock(&kvm->mmu_lock);
387 kvm_arch_mmu_notifier_invalidate_range(kvm, start, end);
389 srcu_read_unlock(&kvm->srcu, idx);
390 }
392 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
393 struct mm_struct *mm,
394 unsigned long start,
395 unsigned long end)
396 {
397 struct kvm *kvm = mmu_notifier_to_kvm(mn);
399 spin_lock(&kvm->mmu_lock);
400 /*
401 * This sequence increase will notify the kvm page fault that
402 * the page that is going to be mapped in the spte could have
403 * been freed.
404 */
405 kvm->mmu_notifier_seq++;
406 smp_wmb();
407 /*
408 * The above sequence increase must be visible before the
409 * below count decrease, which is ensured by the smp_wmb above
410 * in conjunction with the smp_rmb in mmu_notifier_retry().
411 */
412 kvm->mmu_notifier_count--;
413 spin_unlock(&kvm->mmu_lock);
415 BUG_ON(kvm->mmu_notifier_count < 0);
416 }
418 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
419 struct mm_struct *mm,
420 unsigned long start,
421 unsigned long end)
422 {
423 struct kvm *kvm = mmu_notifier_to_kvm(mn);
424 int young, idx;
426 idx = srcu_read_lock(&kvm->srcu);
427 spin_lock(&kvm->mmu_lock);
429 young = kvm_age_hva(kvm, start, end);
430 if (young)
431 kvm_flush_remote_tlbs(kvm);
433 spin_unlock(&kvm->mmu_lock);
434 srcu_read_unlock(&kvm->srcu, idx);
436 return young;
437 }
439 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
440 struct mm_struct *mm,
441 unsigned long start,
442 unsigned long end)
443 {
444 struct kvm *kvm = mmu_notifier_to_kvm(mn);
445 int young, idx;
447 idx = srcu_read_lock(&kvm->srcu);
448 spin_lock(&kvm->mmu_lock);
449 /*
450 * Even though we do not flush TLB, this will still adversely
451 * affect performance on pre-Haswell Intel EPT, where there is
452 * no EPT Access Bit to clear so that we have to tear down EPT
453 * tables instead. If we find this unacceptable, we can always
454 * add a parameter to kvm_age_hva so that it effectively doesn't
455 * do anything on clear_young.
456 *
457 * Also note that currently we never issue secondary TLB flushes
458 * from clear_young, leaving this job up to the regular system
459 * cadence. If we find this inaccurate, we might come up with a
460 * more sophisticated heuristic later.
461 */
462 young = kvm_age_hva(kvm, start, end);
463 spin_unlock(&kvm->mmu_lock);
464 srcu_read_unlock(&kvm->srcu, idx);
466 return young;
467 }
469 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
470 struct mm_struct *mm,
471 unsigned long address)
472 {
473 struct kvm *kvm = mmu_notifier_to_kvm(mn);
474 int young, idx;
476 idx = srcu_read_lock(&kvm->srcu);
477 spin_lock(&kvm->mmu_lock);
478 young = kvm_test_age_hva(kvm, address);
479 spin_unlock(&kvm->mmu_lock);
480 srcu_read_unlock(&kvm->srcu, idx);
482 return young;
483 }
485 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
486 struct mm_struct *mm)
487 {
488 struct kvm *kvm = mmu_notifier_to_kvm(mn);
489 int idx;
491 idx = srcu_read_lock(&kvm->srcu);
492 kvm_arch_flush_shadow_all(kvm);
493 srcu_read_unlock(&kvm->srcu, idx);
494 }
496 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
497 .flags = MMU_INVALIDATE_DOES_NOT_BLOCK,
498 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
499 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
500 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
501 .clear_young = kvm_mmu_notifier_clear_young,
502 .test_young = kvm_mmu_notifier_test_young,
503 .change_pte = kvm_mmu_notifier_change_pte,
504 .release = kvm_mmu_notifier_release,
505 };
507 static int kvm_init_mmu_notifier(struct kvm *kvm)
508 {
509 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
510 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
511 }
513 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
515 static int kvm_init_mmu_notifier(struct kvm *kvm)
516 {
517 return 0;
518 }
520 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
522 static struct kvm_memslots *kvm_alloc_memslots(void)
523 {
524 int i;
525 struct kvm_memslots *slots;
527 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
528 if (!slots)
529 return NULL;
531 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
532 slots->id_to_index[i] = slots->memslots[i].id = i;
534 return slots;
535 }
537 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
538 {
539 if (!memslot->dirty_bitmap)
540 return;
542 kvfree(memslot->dirty_bitmap);
543 memslot->dirty_bitmap = NULL;
544 }
546 /*
547 * Free any memory in @free but not in @dont.
548 */
549 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
550 struct kvm_memory_slot *dont)
551 {
552 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
553 kvm_destroy_dirty_bitmap(free);
555 kvm_arch_free_memslot(kvm, free, dont);
557 free->npages = 0;
558 }
560 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
561 {
562 struct kvm_memory_slot *memslot;
564 if (!slots)
565 return;
567 kvm_for_each_memslot(memslot, slots)
568 kvm_free_memslot(kvm, memslot, NULL);
570 kvfree(slots);
571 }
573 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
574 {
575 int i;
577 if (!kvm->debugfs_dentry)
578 return;
580 debugfs_remove_recursive(kvm->debugfs_dentry);
582 if (kvm->debugfs_stat_data) {
583 for (i = 0; i < kvm_debugfs_num_entries; i++)
584 kfree(kvm->debugfs_stat_data[i]);
585 kfree(kvm->debugfs_stat_data);
586 }
587 }
589 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
590 {
591 char dir_name[ITOA_MAX_LEN * 2];
592 struct kvm_stat_data *stat_data;
593 struct kvm_stats_debugfs_item *p;
595 if (!debugfs_initialized())
596 return 0;
598 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
599 kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
601 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
602 sizeof(*kvm->debugfs_stat_data),
603 GFP_KERNEL);
604 if (!kvm->debugfs_stat_data)
605 return -ENOMEM;
607 for (p = debugfs_entries; p->name; p++) {
608 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
609 if (!stat_data)
610 return -ENOMEM;
612 stat_data->kvm = kvm;
613 stat_data->offset = p->offset;
614 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
615 debugfs_create_file(p->name, 0644, kvm->debugfs_dentry,
616 stat_data, stat_fops_per_vm[p->kind]);
617 }
618 return 0;
619 }
621 static struct kvm *kvm_create_vm(unsigned long type)
622 {
623 int r, i;
624 struct kvm *kvm = kvm_arch_alloc_vm();
626 if (!kvm)
627 return ERR_PTR(-ENOMEM);
629 spin_lock_init(&kvm->mmu_lock);
630 mmgrab(current->mm);
631 kvm->mm = current->mm;
632 kvm_eventfd_init(kvm);
633 mutex_init(&kvm->lock);
634 mutex_init(&kvm->irq_lock);
635 mutex_init(&kvm->slots_lock);
636 refcount_set(&kvm->users_count, 1);
637 INIT_LIST_HEAD(&kvm->devices);
639 r = kvm_arch_init_vm(kvm, type);
640 if (r)
641 goto out_err_no_disable;
643 r = hardware_enable_all();
644 if (r)
645 goto out_err_no_disable;
647 #ifdef CONFIG_HAVE_KVM_IRQFD
648 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
649 #endif
651 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
653 r = -ENOMEM;
654 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
655 struct kvm_memslots *slots = kvm_alloc_memslots();
656 if (!slots)
657 goto out_err_no_srcu;
658 /*
659 * Generations must be different for each address space.
660 * Init kvm generation close to the maximum to easily test the
661 * code of handling generation number wrap-around.
662 */
663 slots->generation = i * 2 - 150;
664 rcu_assign_pointer(kvm->memslots[i], slots);
665 }
667 if (init_srcu_struct(&kvm->srcu))
668 goto out_err_no_srcu;
669 if (init_srcu_struct(&kvm->irq_srcu))
670 goto out_err_no_irq_srcu;
671 for (i = 0; i < KVM_NR_BUSES; i++) {
672 rcu_assign_pointer(kvm->buses[i],
673 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL));
674 if (!kvm->buses[i])
675 goto out_err;
676 }
678 r = kvm_init_mmu_notifier(kvm);
679 if (r)
680 goto out_err;
682 spin_lock(&kvm_lock);
683 list_add(&kvm->vm_list, &vm_list);
684 spin_unlock(&kvm_lock);
686 preempt_notifier_inc();
688 return kvm;
690 out_err:
691 cleanup_srcu_struct(&kvm->irq_srcu);
692 out_err_no_irq_srcu:
693 cleanup_srcu_struct(&kvm->srcu);
694 out_err_no_srcu:
695 hardware_disable_all();
696 out_err_no_disable:
697 refcount_set(&kvm->users_count, 0);
698 for (i = 0; i < KVM_NR_BUSES; i++)
699 kfree(kvm_get_bus(kvm, i));
700 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
701 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
702 kvm_arch_free_vm(kvm);
703 mmdrop(current->mm);
704 return ERR_PTR(r);
705 }
707 static void kvm_destroy_devices(struct kvm *kvm)
708 {
709 struct kvm_device *dev, *tmp;
711 /*
712 * We do not need to take the kvm->lock here, because nobody else
713 * has a reference to the struct kvm at this point and therefore
714 * cannot access the devices list anyhow.
715 */
716 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
717 list_del(&dev->vm_node);
718 dev->ops->destroy(dev);
719 }
720 }
722 static void kvm_destroy_vm(struct kvm *kvm)
723 {
724 int i;
725 struct mm_struct *mm = kvm->mm;
727 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
728 kvm_destroy_vm_debugfs(kvm);
729 kvm_arch_sync_events(kvm);
730 spin_lock(&kvm_lock);
731 list_del(&kvm->vm_list);
732 spin_unlock(&kvm_lock);
733 kvm_free_irq_routing(kvm);
734 for (i = 0; i < KVM_NR_BUSES; i++) {
735 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
737 if (bus)
738 kvm_io_bus_destroy(bus);
739 kvm->buses[i] = NULL;
740 }
741 kvm_coalesced_mmio_free(kvm);
742 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
743 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
744 #else
745 kvm_arch_flush_shadow_all(kvm);
746 #endif
747 kvm_arch_destroy_vm(kvm);
748 kvm_destroy_devices(kvm);
749 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
750 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
751 cleanup_srcu_struct(&kvm->irq_srcu);
752 cleanup_srcu_struct(&kvm->srcu);
753 kvm_arch_free_vm(kvm);
754 preempt_notifier_dec();
755 hardware_disable_all();
756 mmdrop(mm);
757 }
759 void kvm_get_kvm(struct kvm *kvm)
760 {
761 refcount_inc(&kvm->users_count);
762 }
763 EXPORT_SYMBOL_GPL(kvm_get_kvm);
765 void kvm_put_kvm(struct kvm *kvm)
766 {
767 if (refcount_dec_and_test(&kvm->users_count))
768 kvm_destroy_vm(kvm);
769 }
770 EXPORT_SYMBOL_GPL(kvm_put_kvm);
773 static int kvm_vm_release(struct inode *inode, struct file *filp)
774 {
775 struct kvm *kvm = filp->private_data;
777 kvm_irqfd_release(kvm);
779 kvm_put_kvm(kvm);
780 return 0;
781 }
783 /*
784 * Allocation size is twice as large as the actual dirty bitmap size.
785 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
786 */
787 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
788 {
789 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
791 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL);
792 if (!memslot->dirty_bitmap)
793 return -ENOMEM;
795 return 0;
796 }
798 /*
799 * Insert memslot and re-sort memslots based on their GFN,
800 * so binary search could be used to lookup GFN.
801 * Sorting algorithm takes advantage of having initially
802 * sorted array and known changed memslot position.
803 */
804 static void update_memslots(struct kvm_memslots *slots,
805 struct kvm_memory_slot *new)
806 {
807 int id = new->id;
808 int i = slots->id_to_index[id];
809 struct kvm_memory_slot *mslots = slots->memslots;
811 WARN_ON(mslots[i].id != id);
812 if (!new->npages) {
813 WARN_ON(!mslots[i].npages);
814 if (mslots[i].npages)
815 slots->used_slots--;
816 } else {
817 if (!mslots[i].npages)
818 slots->used_slots++;
819 }
821 while (i < KVM_MEM_SLOTS_NUM - 1 &&
822 new->base_gfn <= mslots[i + 1].base_gfn) {
823 if (!mslots[i + 1].npages)
824 break;
825 mslots[i] = mslots[i + 1];
826 slots->id_to_index[mslots[i].id] = i;
827 i++;
828 }
830 /*
831 * The ">=" is needed when creating a slot with base_gfn == 0,
832 * so that it moves before all those with base_gfn == npages == 0.
833 *
834 * On the other hand, if new->npages is zero, the above loop has
835 * already left i pointing to the beginning of the empty part of
836 * mslots, and the ">=" would move the hole backwards in this
837 * case---which is wrong. So skip the loop when deleting a slot.
838 */
839 if (new->npages) {
840 while (i > 0 &&
841 new->base_gfn >= mslots[i - 1].base_gfn) {
842 mslots[i] = mslots[i - 1];
843 slots->id_to_index[mslots[i].id] = i;
844 i--;
845 }
846 } else
847 WARN_ON_ONCE(i != slots->used_slots);
849 mslots[i] = *new;
850 slots->id_to_index[mslots[i].id] = i;
851 }
853 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
854 {
855 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
857 #ifdef __KVM_HAVE_READONLY_MEM
858 valid_flags |= KVM_MEM_READONLY;
859 #endif
861 if (mem->flags & ~valid_flags)
862 return -EINVAL;
864 return 0;
865 }
867 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
868 int as_id, struct kvm_memslots *slots)
869 {
870 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
872 /*
873 * Set the low bit in the generation, which disables SPTE caching
874 * until the end of synchronize_srcu_expedited.
875 */
876 WARN_ON(old_memslots->generation & 1);
877 slots->generation = old_memslots->generation + 1;
879 rcu_assign_pointer(kvm->memslots[as_id], slots);
880 synchronize_srcu_expedited(&kvm->srcu);
882 /*
883 * Increment the new memslot generation a second time. This prevents
884 * vm exits that race with memslot updates from caching a memslot
885 * generation that will (potentially) be valid forever.
886 *
887 * Generations must be unique even across address spaces. We do not need
888 * a global counter for that, instead the generation space is evenly split
889 * across address spaces. For example, with two address spaces, address
890 * space 0 will use generations 0, 4, 8, ... while * address space 1 will
891 * use generations 2, 6, 10, 14, ...
892 */
893 slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1;
895 kvm_arch_memslots_updated(kvm, slots);
897 return old_memslots;
898 }
900 /*
901 * Allocate some memory and give it an address in the guest physical address
902 * space.
903 *
904 * Discontiguous memory is allowed, mostly for framebuffers.
905 *
906 * Must be called holding kvm->slots_lock for write.
907 */
908 int __kvm_set_memory_region(struct kvm *kvm,
909 const struct kvm_userspace_memory_region *mem)
910 {
911 int r;
912 gfn_t base_gfn;
913 unsigned long npages;
914 struct kvm_memory_slot *slot;
915 struct kvm_memory_slot old, new;
916 struct kvm_memslots *slots = NULL, *old_memslots;
917 int as_id, id;
918 enum kvm_mr_change change;
920 r = check_memory_region_flags(mem);
921 if (r)
922 goto out;
924 r = -EINVAL;
925 as_id = mem->slot >> 16;
926 id = (u16)mem->slot;
928 /* General sanity checks */
929 if (mem->memory_size & (PAGE_SIZE - 1))
930 goto out;
931 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
932 goto out;
933 /* We can read the guest memory with __xxx_user() later on. */
934 if ((id < KVM_USER_MEM_SLOTS) &&
935 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
936 !access_ok(VERIFY_WRITE,
937 (void __user *)(unsigned long)mem->userspace_addr,
938 mem->memory_size)))
939 goto out;
940 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
941 goto out;
942 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
943 goto out;
945 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
946 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
947 npages = mem->memory_size >> PAGE_SHIFT;
949 if (npages > KVM_MEM_MAX_NR_PAGES)
950 goto out;
952 new = old = *slot;
954 new.id = id;
955 new.base_gfn = base_gfn;
956 new.npages = npages;
957 new.flags = mem->flags;
959 if (npages) {
960 if (!old.npages)
961 change = KVM_MR_CREATE;
962 else { /* Modify an existing slot. */
963 if ((mem->userspace_addr != old.userspace_addr) ||
964 (npages != old.npages) ||
965 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
966 goto out;
968 if (base_gfn != old.base_gfn)
969 change = KVM_MR_MOVE;
970 else if (new.flags != old.flags)
971 change = KVM_MR_FLAGS_ONLY;
972 else { /* Nothing to change. */
973 r = 0;
974 goto out;
975 }
976 }
977 } else {
978 if (!old.npages)
979 goto out;
981 change = KVM_MR_DELETE;
982 new.base_gfn = 0;
983 new.flags = 0;
984 }
986 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
987 /* Check for overlaps */
988 r = -EEXIST;
989 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
990 if (slot->id == id)
991 continue;
992 if (!((base_gfn + npages <= slot->base_gfn) ||
993 (base_gfn >= slot->base_gfn + slot->npages)))
994 goto out;
995 }
996 }
998 /* Free page dirty bitmap if unneeded */
999 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1000 new.dirty_bitmap = NULL;
1002 r = -ENOMEM;
1003 if (change == KVM_MR_CREATE) {
1004 new.userspace_addr = mem->userspace_addr;
1006 if (kvm_arch_create_memslot(kvm, &new, npages))
1007 goto out_free;
1008 }
1010 /* Allocate page dirty bitmap if needed */
1011 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1012 if (kvm_create_dirty_bitmap(&new) < 0)
1013 goto out_free;
1014 }
1016 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
1017 if (!slots)
1018 goto out_free;
1019 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1021 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1022 slot = id_to_memslot(slots, id);
1023 slot->flags |= KVM_MEMSLOT_INVALID;
1025 old_memslots = install_new_memslots(kvm, as_id, slots);
1027 /* From this point no new shadow pages pointing to a deleted,
1028 * or moved, memslot will be created.
1029 *
1030 * validation of sp->gfn happens in:
1031 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1032 * - kvm_is_visible_gfn (mmu_check_roots)
1033 */
1034 kvm_arch_flush_shadow_memslot(kvm, slot);
1036 /*
1037 * We can re-use the old_memslots from above, the only difference
1038 * from the currently installed memslots is the invalid flag. This
1039 * will get overwritten by update_memslots anyway.
1040 */
1041 slots = old_memslots;
1042 }
1044 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1045 if (r)
1046 goto out_slots;
1048 /* actual memory is freed via old in kvm_free_memslot below */
1049 if (change == KVM_MR_DELETE) {
1050 new.dirty_bitmap = NULL;
1051 memset(&new.arch, 0, sizeof(new.arch));
1052 }
1054 update_memslots(slots, &new);
1055 old_memslots = install_new_memslots(kvm, as_id, slots);
1057 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1059 kvm_free_memslot(kvm, &old, &new);
1060 kvfree(old_memslots);
1061 return 0;
1063 out_slots:
1064 kvfree(slots);
1065 out_free:
1066 kvm_free_memslot(kvm, &new, &old);
1067 out:
1068 return r;
1069 }
1070 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1072 int kvm_set_memory_region(struct kvm *kvm,
1073 const struct kvm_userspace_memory_region *mem)
1074 {
1075 int r;
1077 mutex_lock(&kvm->slots_lock);
1078 r = __kvm_set_memory_region(kvm, mem);
1079 mutex_unlock(&kvm->slots_lock);
1080 return r;
1081 }
1082 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1084 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1085 struct kvm_userspace_memory_region *mem)
1086 {
1087 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1088 return -EINVAL;
1090 return kvm_set_memory_region(kvm, mem);
1091 }
1093 int kvm_get_dirty_log(struct kvm *kvm,
1094 struct kvm_dirty_log *log, int *is_dirty)
1095 {
1096 struct kvm_memslots *slots;
1097 struct kvm_memory_slot *memslot;
1098 int i, as_id, id;
1099 unsigned long n;
1100 unsigned long any = 0;
1102 as_id = log->slot >> 16;
1103 id = (u16)log->slot;
1104 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1105 return -EINVAL;
1107 slots = __kvm_memslots(kvm, as_id);
1108 memslot = id_to_memslot(slots, id);
1109 if (!memslot->dirty_bitmap)
1110 return -ENOENT;
1112 n = kvm_dirty_bitmap_bytes(memslot);
1114 for (i = 0; !any && i < n/sizeof(long); ++i)
1115 any = memslot->dirty_bitmap[i];
1117 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1118 return -EFAULT;
1120 if (any)
1121 *is_dirty = 1;
1122 return 0;
1123 }
1124 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1126 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1127 /**
1128 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1129 * are dirty write protect them for next write.
1130 * @kvm: pointer to kvm instance
1131 * @log: slot id and address to which we copy the log
1132 * @is_dirty: flag set if any page is dirty
1133 *
1134 * We need to keep it in mind that VCPU threads can write to the bitmap
1135 * concurrently. So, to avoid losing track of dirty pages we keep the
1136 * following order:
1137 *
1138 * 1. Take a snapshot of the bit and clear it if needed.
1139 * 2. Write protect the corresponding page.
1140 * 3. Copy the snapshot to the userspace.
1141 * 4. Upon return caller flushes TLB's if needed.
1142 *
1143 * Between 2 and 4, the guest may write to the page using the remaining TLB
1144 * entry. This is not a problem because the page is reported dirty using
1145 * the snapshot taken before and step 4 ensures that writes done after
1146 * exiting to userspace will be logged for the next call.
1147 *
1148 */
1149 int kvm_get_dirty_log_protect(struct kvm *kvm,
1150 struct kvm_dirty_log *log, bool *is_dirty)
1151 {
1152 struct kvm_memslots *slots;
1153 struct kvm_memory_slot *memslot;
1154 int i, as_id, id;
1155 unsigned long n;
1156 unsigned long *dirty_bitmap;
1157 unsigned long *dirty_bitmap_buffer;
1159 as_id = log->slot >> 16;
1160 id = (u16)log->slot;
1161 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1162 return -EINVAL;
1164 slots = __kvm_memslots(kvm, as_id);
1165 memslot = id_to_memslot(slots, id);
1167 dirty_bitmap = memslot->dirty_bitmap;
1168 if (!dirty_bitmap)
1169 return -ENOENT;
1171 n = kvm_dirty_bitmap_bytes(memslot);
1173 dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot);
1174 memset(dirty_bitmap_buffer, 0, n);
1176 spin_lock(&kvm->mmu_lock);
1177 *is_dirty = false;
1178 for (i = 0; i < n / sizeof(long); i++) {
1179 unsigned long mask;
1180 gfn_t offset;
1182 if (!dirty_bitmap[i])
1183 continue;
1185 *is_dirty = true;
1187 mask = xchg(&dirty_bitmap[i], 0);
1188 dirty_bitmap_buffer[i] = mask;
1190 if (mask) {
1191 offset = i * BITS_PER_LONG;
1192 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1193 offset, mask);
1194 }
1195 }
1197 spin_unlock(&kvm->mmu_lock);
1198 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1199 return -EFAULT;
1200 return 0;
1201 }
1202 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1203 #endif
1205 bool kvm_largepages_enabled(void)
1206 {
1207 return largepages_enabled;
1208 }
1210 void kvm_disable_largepages(void)
1211 {
1212 largepages_enabled = false;
1213 }
1214 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1216 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1217 {
1218 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1219 }
1220 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1222 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1223 {
1224 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1225 }
1227 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1228 {
1229 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1231 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1232 memslot->flags & KVM_MEMSLOT_INVALID)
1233 return false;
1235 return true;
1236 }
1237 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1239 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1240 {
1241 struct vm_area_struct *vma;
1242 unsigned long addr, size;
1244 size = PAGE_SIZE;
1246 addr = gfn_to_hva(kvm, gfn);
1247 if (kvm_is_error_hva(addr))
1248 return PAGE_SIZE;
1250 down_read(¤t->mm->mmap_sem);
1251 vma = find_vma(current->mm, addr);
1252 if (!vma)
1253 goto out;
1255 size = vma_kernel_pagesize(vma);
1257 out:
1258 up_read(¤t->mm->mmap_sem);
1260 return size;
1261 }
1263 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1264 {
1265 return slot->flags & KVM_MEM_READONLY;
1266 }
1268 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1269 gfn_t *nr_pages, bool write)
1270 {
1271 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1272 return KVM_HVA_ERR_BAD;
1274 if (memslot_is_readonly(slot) && write)
1275 return KVM_HVA_ERR_RO_BAD;
1277 if (nr_pages)
1278 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1280 return __gfn_to_hva_memslot(slot, gfn);
1281 }
1283 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1284 gfn_t *nr_pages)
1285 {
1286 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1287 }
1289 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1290 gfn_t gfn)
1291 {
1292 return gfn_to_hva_many(slot, gfn, NULL);
1293 }
1294 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1296 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1297 {
1298 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1299 }
1300 EXPORT_SYMBOL_GPL(gfn_to_hva);
1302 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1303 {
1304 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1305 }
1306 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1308 /*
1309 * If writable is set to false, the hva returned by this function is only
1310 * allowed to be read.
1311 */
1312 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1313 gfn_t gfn, bool *writable)
1314 {
1315 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1317 if (!kvm_is_error_hva(hva) && writable)
1318 *writable = !memslot_is_readonly(slot);
1320 return hva;
1321 }
1323 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1324 {
1325 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1327 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1328 }
1330 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1331 {
1332 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1334 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1335 }
1337 static inline int check_user_page_hwpoison(unsigned long addr)
1338 {
1339 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1341 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1342 return rc == -EHWPOISON;
1343 }
1345 /*
1346 * The fast path to get the writable pfn which will be stored in @pfn,
1347 * true indicates success, otherwise false is returned. It's also the
1348 * only part that runs if we can are in atomic context.
1349 */
1350 static bool hva_to_pfn_fast(unsigned long addr, bool write_fault,
1351 bool *writable, kvm_pfn_t *pfn)
1352 {
1353 struct page *page[1];
1354 int npages;
1356 /*
1357 * Fast pin a writable pfn only if it is a write fault request
1358 * or the caller allows to map a writable pfn for a read fault
1359 * request.
1360 */
1361 if (!(write_fault || writable))
1362 return false;
1364 npages = __get_user_pages_fast(addr, 1, 1, page);
1365 if (npages == 1) {
1366 *pfn = page_to_pfn(page[0]);
1368 if (writable)
1369 *writable = true;
1370 return true;
1371 }
1373 return false;
1374 }
1376 /*
1377 * The slow path to get the pfn of the specified host virtual address,
1378 * 1 indicates success, -errno is returned if error is detected.
1379 */
1380 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1381 bool *writable, kvm_pfn_t *pfn)
1382 {
1383 unsigned int flags = FOLL_HWPOISON;
1384 struct page *page;
1385 int npages = 0;
1387 might_sleep();
1389 if (writable)
1390 *writable = write_fault;
1392 if (write_fault)
1393 flags |= FOLL_WRITE;
1394 if (async)
1395 flags |= FOLL_NOWAIT;
1397 npages = get_user_pages_unlocked(addr, 1, &page, flags);
1398 if (npages != 1)
1399 return npages;
1401 /* map read fault as writable if possible */
1402 if (unlikely(!write_fault) && writable) {
1403 struct page *wpage;
1405 if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) {
1406 *writable = true;
1407 put_page(page);
1408 page = wpage;
1409 }
1410 }
1411 *pfn = page_to_pfn(page);
1412 return npages;
1413 }
1415 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1416 {
1417 if (unlikely(!(vma->vm_flags & VM_READ)))
1418 return false;
1420 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1421 return false;
1423 return true;
1424 }
1426 static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1427 unsigned long addr, bool *async,
1428 bool write_fault, bool *writable,
1429 kvm_pfn_t *p_pfn)
1430 {
1431 unsigned long pfn;
1432 int r;
1434 r = follow_pfn(vma, addr, &pfn);
1435 if (r) {
1436 /*
1437 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1438 * not call the fault handler, so do it here.
1439 */
1440 bool unlocked = false;
1441 r = fixup_user_fault(current, current->mm, addr,
1442 (write_fault ? FAULT_FLAG_WRITE : 0),
1443 &unlocked);
1444 if (unlocked)
1445 return -EAGAIN;
1446 if (r)
1447 return r;
1449 r = follow_pfn(vma, addr, &pfn);
1450 if (r)
1451 return r;
1453 }
1455 if (writable)
1456 *writable = true;
1458 /*
1459 * Get a reference here because callers of *hva_to_pfn* and
1460 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1461 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1462 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1463 * simply do nothing for reserved pfns.
1464 *
1465 * Whoever called remap_pfn_range is also going to call e.g.
1466 * unmap_mapping_range before the underlying pages are freed,
1467 * causing a call to our MMU notifier.
1468 */
1469 kvm_get_pfn(pfn);
1471 *p_pfn = pfn;
1472 return 0;
1473 }
1475 /*
1476 * Pin guest page in memory and return its pfn.
1477 * @addr: host virtual address which maps memory to the guest
1478 * @atomic: whether this function can sleep
1479 * @async: whether this function need to wait IO complete if the
1480 * host page is not in the memory
1481 * @write_fault: whether we should get a writable host page
1482 * @writable: whether it allows to map a writable host page for !@write_fault
1483 *
1484 * The function will map a writable host page for these two cases:
1485 * 1): @write_fault = true
1486 * 2): @write_fault = false && @writable, @writable will tell the caller
1487 * whether the mapping is writable.
1488 */
1489 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1490 bool write_fault, bool *writable)
1491 {
1492 struct vm_area_struct *vma;
1493 kvm_pfn_t pfn = 0;
1494 int npages, r;
1496 /* we can do it either atomically or asynchronously, not both */
1497 BUG_ON(atomic && async);
1499 if (hva_to_pfn_fast(addr, write_fault, writable, &pfn))
1500 return pfn;
1502 if (atomic)
1503 return KVM_PFN_ERR_FAULT;
1505 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1506 if (npages == 1)
1507 return pfn;
1509 down_read(¤t->mm->mmap_sem);
1510 if (npages == -EHWPOISON ||
1511 (!async && check_user_page_hwpoison(addr))) {
1512 pfn = KVM_PFN_ERR_HWPOISON;
1513 goto exit;
1514 }
1516 retry:
1517 vma = find_vma_intersection(current->mm, addr, addr + 1);
1519 if (vma == NULL)
1520 pfn = KVM_PFN_ERR_FAULT;
1521 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1522 r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
1523 if (r == -EAGAIN)
1524 goto retry;
1525 if (r < 0)
1526 pfn = KVM_PFN_ERR_FAULT;
1527 } else {
1528 if (async && vma_is_valid(vma, write_fault))
1529 *async = true;
1530 pfn = KVM_PFN_ERR_FAULT;
1531 }
1532 exit:
1533 up_read(¤t->mm->mmap_sem);
1534 return pfn;
1535 }
1537 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1538 bool atomic, bool *async, bool write_fault,
1539 bool *writable)
1540 {
1541 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1543 if (addr == KVM_HVA_ERR_RO_BAD) {
1544 if (writable)
1545 *writable = false;
1546 return KVM_PFN_ERR_RO_FAULT;
1547 }
1549 if (kvm_is_error_hva(addr)) {
1550 if (writable)
1551 *writable = false;
1552 return KVM_PFN_NOSLOT;
1553 }
1555 /* Do not map writable pfn in the readonly memslot. */
1556 if (writable && memslot_is_readonly(slot)) {
1557 *writable = false;
1558 writable = NULL;
1559 }
1561 return hva_to_pfn(addr, atomic, async, write_fault,
1562 writable);
1563 }
1564 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1566 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1567 bool *writable)
1568 {
1569 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1570 write_fault, writable);
1571 }
1572 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1574 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1575 {
1576 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1577 }
1578 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1580 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1581 {
1582 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1583 }
1584 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1586 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1587 {
1588 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1589 }
1590 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1592 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1593 {
1594 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1595 }
1596 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1598 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1599 {
1600 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1601 }
1602 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1604 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1605 {
1606 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1607 }
1608 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1610 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1611 struct page **pages, int nr_pages)
1612 {
1613 unsigned long addr;
1614 gfn_t entry = 0;
1616 addr = gfn_to_hva_many(slot, gfn, &entry);
1617 if (kvm_is_error_hva(addr))
1618 return -1;
1620 if (entry < nr_pages)
1621 return 0;
1623 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1624 }
1625 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1627 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1628 {
1629 if (is_error_noslot_pfn(pfn))
1630 return KVM_ERR_PTR_BAD_PAGE;
1632 if (kvm_is_reserved_pfn(pfn)) {
1633 WARN_ON(1);
1634 return KVM_ERR_PTR_BAD_PAGE;
1635 }
1637 return pfn_to_page(pfn);
1638 }
1640 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1641 {
1642 kvm_pfn_t pfn;
1644 pfn = gfn_to_pfn(kvm, gfn);
1646 return kvm_pfn_to_page(pfn);
1647 }
1648 EXPORT_SYMBOL_GPL(gfn_to_page);
1650 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1651 {
1652 kvm_pfn_t pfn;
1654 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1656 return kvm_pfn_to_page(pfn);
1657 }
1658 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1660 void kvm_release_page_clean(struct page *page)
1661 {
1662 WARN_ON(is_error_page(page));
1664 kvm_release_pfn_clean(page_to_pfn(page));
1665 }
1666 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1668 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1669 {
1670 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1671 put_page(pfn_to_page(pfn));
1672 }
1673 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1675 void kvm_release_page_dirty(struct page *page)
1676 {
1677 WARN_ON(is_error_page(page));
1679 kvm_release_pfn_dirty(page_to_pfn(page));
1680 }
1681 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1683 void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1684 {
1685 kvm_set_pfn_dirty(pfn);
1686 kvm_release_pfn_clean(pfn);
1687 }
1688 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1690 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1691 {
1692 if (!kvm_is_reserved_pfn(pfn)) {
1693 struct page *page = pfn_to_page(pfn);
1695 if (!PageReserved(page))
1696 SetPageDirty(page);
1697 }
1698 }
1699 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1701 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1702 {
1703 if (!kvm_is_reserved_pfn(pfn))
1704 mark_page_accessed(pfn_to_page(pfn));
1705 }
1706 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1708 void kvm_get_pfn(kvm_pfn_t pfn)
1709 {
1710 if (!kvm_is_reserved_pfn(pfn))
1711 get_page(pfn_to_page(pfn));
1712 }
1713 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1715 static int next_segment(unsigned long len, int offset)
1716 {
1717 if (len > PAGE_SIZE - offset)
1718 return PAGE_SIZE - offset;
1719 else
1720 return len;
1721 }
1723 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1724 void *data, int offset, int len)
1725 {
1726 int r;
1727 unsigned long addr;
1729 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1730 if (kvm_is_error_hva(addr))
1731 return -EFAULT;
1732 r = __copy_from_user(data, (void __user *)addr + offset, len);
1733 if (r)
1734 return -EFAULT;
1735 return 0;
1736 }
1738 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1739 int len)
1740 {
1741 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1743 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1744 }
1745 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1747 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1748 int offset, int len)
1749 {
1750 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1752 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1753 }
1754 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1756 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1757 {
1758 gfn_t gfn = gpa >> PAGE_SHIFT;
1759 int seg;
1760 int offset = offset_in_page(gpa);
1761 int ret;
1763 while ((seg = next_segment(len, offset)) != 0) {
1764 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1765 if (ret < 0)
1766 return ret;
1767 offset = 0;
1768 len -= seg;
1769 data += seg;
1770 ++gfn;
1771 }
1772 return 0;
1773 }
1774 EXPORT_SYMBOL_GPL(kvm_read_guest);
1776 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1777 {
1778 gfn_t gfn = gpa >> PAGE_SHIFT;
1779 int seg;
1780 int offset = offset_in_page(gpa);
1781 int ret;
1783 while ((seg = next_segment(len, offset)) != 0) {
1784 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1785 if (ret < 0)
1786 return ret;
1787 offset = 0;
1788 len -= seg;
1789 data += seg;
1790 ++gfn;
1791 }
1792 return 0;
1793 }
1794 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1796 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1797 void *data, int offset, unsigned long len)
1798 {
1799 int r;
1800 unsigned long addr;
1802 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1803 if (kvm_is_error_hva(addr))
1804 return -EFAULT;
1805 pagefault_disable();
1806 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1807 pagefault_enable();
1808 if (r)
1809 return -EFAULT;
1810 return 0;
1811 }
1813 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1814 unsigned long len)
1815 {
1816 gfn_t gfn = gpa >> PAGE_SHIFT;
1817 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1818 int offset = offset_in_page(gpa);
1820 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1821 }
1822 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1824 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1825 void *data, unsigned long len)
1826 {
1827 gfn_t gfn = gpa >> PAGE_SHIFT;
1828 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1829 int offset = offset_in_page(gpa);
1831 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1832 }
1833 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1835 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1836 const void *data, int offset, int len)
1837 {
1838 int r;
1839 unsigned long addr;
1841 addr = gfn_to_hva_memslot(memslot, gfn);
1842 if (kvm_is_error_hva(addr))
1843 return -EFAULT;
1844 r = __copy_to_user((void __user *)addr + offset, data, len);
1845 if (r)
1846 return -EFAULT;
1847 mark_page_dirty_in_slot(memslot, gfn);
1848 return 0;
1849 }
1851 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1852 const void *data, int offset, int len)
1853 {
1854 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1856 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1857 }
1858 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1860 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1861 const void *data, int offset, int len)
1862 {
1863 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1865 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1866 }
1867 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1869 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1870 unsigned long len)
1871 {
1872 gfn_t gfn = gpa >> PAGE_SHIFT;
1873 int seg;
1874 int offset = offset_in_page(gpa);
1875 int ret;
1877 while ((seg = next_segment(len, offset)) != 0) {
1878 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1879 if (ret < 0)
1880 return ret;
1881 offset = 0;
1882 len -= seg;
1883 data += seg;
1884 ++gfn;
1885 }
1886 return 0;
1887 }
1888 EXPORT_SYMBOL_GPL(kvm_write_guest);
1890 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1891 unsigned long len)
1892 {
1893 gfn_t gfn = gpa >> PAGE_SHIFT;
1894 int seg;
1895 int offset = offset_in_page(gpa);
1896 int ret;
1898 while ((seg = next_segment(len, offset)) != 0) {
1899 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1900 if (ret < 0)
1901 return ret;
1902 offset = 0;
1903 len -= seg;
1904 data += seg;
1905 ++gfn;
1906 }
1907 return 0;
1908 }
1909 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1911 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
1912 struct gfn_to_hva_cache *ghc,
1913 gpa_t gpa, unsigned long len)
1914 {
1915 int offset = offset_in_page(gpa);
1916 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1917 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1918 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1919 gfn_t nr_pages_avail;
1921 ghc->gpa = gpa;
1922 ghc->generation = slots->generation;
1923 ghc->len = len;
1924 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1925 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1926 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1927 ghc->hva += offset;
1928 } else {
1929 /*
1930 * If the requested region crosses two memslots, we still
1931 * verify that the entire region is valid here.
1932 */
1933 while (start_gfn <= end_gfn) {
1934 nr_pages_avail = 0;
1935 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1936 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1937 &nr_pages_avail);
1938 if (kvm_is_error_hva(ghc->hva))
1939 return -EFAULT;
1940 start_gfn += nr_pages_avail;
1941 }
1942 /* Use the slow path for cross page reads and writes. */
1943 ghc->memslot = NULL;
1944 }
1945 return 0;
1946 }
1948 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1949 gpa_t gpa, unsigned long len)
1950 {
1951 struct kvm_memslots *slots = kvm_memslots(kvm);
1952 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
1953 }
1954 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1956 int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1957 void *data, int offset, unsigned long len)
1958 {
1959 struct kvm_memslots *slots = kvm_memslots(kvm);
1960 int r;
1961 gpa_t gpa = ghc->gpa + offset;
1963 BUG_ON(len + offset > ghc->len);
1965 if (slots->generation != ghc->generation)
1966 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
1968 if (unlikely(!ghc->memslot))
1969 return kvm_write_guest(kvm, gpa, data, len);
1971 if (kvm_is_error_hva(ghc->hva))
1972 return -EFAULT;
1974 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
1975 if (r)
1976 return -EFAULT;
1977 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
1979 return 0;
1980 }
1981 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
1983 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1984 void *data, unsigned long len)
1985 {
1986 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
1987 }
1988 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1990 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1991 void *data, unsigned long len)
1992 {
1993 struct kvm_memslots *slots = kvm_memslots(kvm);
1994 int r;
1996 BUG_ON(len > ghc->len);
1998 if (slots->generation != ghc->generation)
1999 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
2001 if (unlikely(!ghc->memslot))
2002 return kvm_read_guest(kvm, ghc->gpa, data, len);
2004 if (kvm_is_error_hva(ghc->hva))
2005 return -EFAULT;
2007 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2008 if (r)
2009 return -EFAULT;
2011 return 0;
2012 }
2013 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2015 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2016 {
2017 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2019 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2020 }
2021 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2023 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2024 {
2025 gfn_t gfn = gpa >> PAGE_SHIFT;
2026 int seg;
2027 int offset = offset_in_page(gpa);
2028 int ret;
2030 while ((seg = next_segment(len, offset)) != 0) {
2031 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2032 if (ret < 0)
2033 return ret;
2034 offset = 0;
2035 len -= seg;
2036 ++gfn;
2037 }
2038 return 0;
2039 }
2040 EXPORT_SYMBOL_GPL(kvm_clear_guest);
2042 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2043 gfn_t gfn)
2044 {
2045 if (memslot && memslot->dirty_bitmap) {
2046 unsigned long rel_gfn = gfn - memslot->base_gfn;
2048 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2049 }
2050 }
2052 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2053 {
2054 struct kvm_memory_slot *memslot;
2056 memslot = gfn_to_memslot(kvm, gfn);
2057 mark_page_dirty_in_slot(memslot, gfn);
2058 }
2059 EXPORT_SYMBOL_GPL(mark_page_dirty);
2061 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2062 {
2063 struct kvm_memory_slot *memslot;
2065 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2066 mark_page_dirty_in_slot(memslot, gfn);
2067 }
2068 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2070 void kvm_sigset_activate(struct kvm_vcpu *vcpu)
2071 {
2072 if (!vcpu->sigset_active)
2073 return;
2075 /*
2076 * This does a lockless modification of ->real_blocked, which is fine
2077 * because, only current can change ->real_blocked and all readers of
2078 * ->real_blocked don't care as long ->real_blocked is always a subset
2079 * of ->blocked.
2080 */
2081 sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked);
2082 }
2084 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu)
2085 {
2086 if (!vcpu->sigset_active)
2087 return;
2089 sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL);
2090 sigemptyset(¤t->real_blocked);
2091 }
2093 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2094 {
2095 unsigned int old, val, grow;
2097 old = val = vcpu->halt_poll_ns;
2098 grow = READ_ONCE(halt_poll_ns_grow);
2099 /* 10us base */
2100 if (val == 0 && grow)
2101 val = 10000;
2102 else
2103 val *= grow;
2105 if (val > halt_poll_ns)
2106 val = halt_poll_ns;
2108 vcpu->halt_poll_ns = val;
2109 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2110 }
2112 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2113 {
2114 unsigned int old, val, shrink;
2116 old = val = vcpu->halt_poll_ns;
2117 shrink = READ_ONCE(halt_poll_ns_shrink);
2118 if (shrink == 0)
2119 val = 0;
2120 else
2121 val /= shrink;
2123 vcpu->halt_poll_ns = val;
2124 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2125 }
2127 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2128 {
2129 int ret = -EINTR;
2130 int idx = srcu_read_lock(&vcpu->kvm->srcu);
2132 if (kvm_arch_vcpu_runnable(vcpu)) {
2133 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2134 goto out;
2135 }
2136 if (kvm_cpu_has_pending_timer(vcpu))
2137 goto out;
2138 if (signal_pending(current))
2139 goto out;
2141 ret = 0;
2142 out:
2143 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2144 return ret;
2145 }
2147 /*
2148 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2149 */
2150 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2151 {
2152 ktime_t start, cur;
2153 DECLARE_SWAITQUEUE(wait);
2154 bool waited = false;
2155 u64 block_ns;
2157 start = cur = ktime_get();
2158 if (vcpu->halt_poll_ns) {
2159 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2161 ++vcpu->stat.halt_attempted_poll;
2162 do {
2163 /*
2164 * This sets KVM_REQ_UNHALT if an interrupt
2165 * arrives.
2166 */
2167 if (kvm_vcpu_check_block(vcpu) < 0) {
2168 ++vcpu->stat.halt_successful_poll;
2169 if (!vcpu_valid_wakeup(vcpu))
2170 ++vcpu->stat.halt_poll_invalid;
2171 goto out;
2172 }
2173 cur = ktime_get();
2174 } while (single_task_running() && ktime_before(cur, stop));
2175 }
2177 kvm_arch_vcpu_blocking(vcpu);
2179 for (;;) {
2180 prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2182 if (kvm_vcpu_check_block(vcpu) < 0)
2183 break;
2185 waited = true;
2186 schedule();
2187 }
2189 finish_swait(&vcpu->wq, &wait);
2190 cur = ktime_get();
2192 kvm_arch_vcpu_unblocking(vcpu);
2193 out:
2194 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2196 if (!vcpu_valid_wakeup(vcpu))
2197 shrink_halt_poll_ns(vcpu);
2198 else if (halt_poll_ns) {
2199 if (block_ns <= vcpu->halt_poll_ns)
2200 ;
2201 /* we had a long block, shrink polling */
2202 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2203 shrink_halt_poll_ns(vcpu);
2204 /* we had a short halt and our poll time is too small */
2205 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2206 block_ns < halt_poll_ns)
2207 grow_halt_poll_ns(vcpu);
2208 } else
2209 vcpu->halt_poll_ns = 0;
2211 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2212 kvm_arch_vcpu_block_finish(vcpu);
2213 }
2214 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2216 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2217 {
2218 struct swait_queue_head *wqp;
2220 wqp = kvm_arch_vcpu_wq(vcpu);
2221 if (swq_has_sleeper(wqp)) {
2222 swake_up_one(wqp);
2223 ++vcpu->stat.halt_wakeup;
2224 return true;
2225 }
2227 return false;
2228 }
2229 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2231 #ifndef CONFIG_S390
2232 /*
2233 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2234 */
2235 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2236 {
2237 int me;
2238 int cpu = vcpu->cpu;
2240 if (kvm_vcpu_wake_up(vcpu))
2241 return;
2243 me = get_cpu();
2244 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2245 if (kvm_arch_vcpu_should_kick(vcpu))
2246 smp_send_reschedule(cpu);
2247 put_cpu();
2248 }
2249 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2250 #endif /* !CONFIG_S390 */
2252 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2253 {
2254 struct pid *pid;
2255 struct task_struct *task = NULL;
2256 int ret = 0;
2258 rcu_read_lock();
2259 pid = rcu_dereference(target->pid);
2260 if (pid)
2261 task = get_pid_task(pid, PIDTYPE_PID);
2262 rcu_read_unlock();
2263 if (!task)
2264 return ret;
2265 ret = yield_to(task, 1);
2266 put_task_struct(task);
2268 return ret;
2269 }
2270 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2272 /*
2273 * Helper that checks whether a VCPU is eligible for directed yield.
2274 * Most eligible candidate to yield is decided by following heuristics:
2275 *
2276 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2277 * (preempted lock holder), indicated by @in_spin_loop.
2278 * Set at the beiginning and cleared at the end of interception/PLE handler.
2279 *
2280 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2281 * chance last time (mostly it has become eligible now since we have probably
2282 * yielded to lockholder in last iteration. This is done by toggling
2283 * @dy_eligible each time a VCPU checked for eligibility.)
2284 *
2285 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2286 * to preempted lock-holder could result in wrong VCPU selection and CPU
2287 * burning. Giving priority for a potential lock-holder increases lock
2288 * progress.
2289 *
2290 * Since algorithm is based on heuristics, accessing another VCPU data without
2291 * locking does not harm. It may result in trying to yield to same VCPU, fail
2292 * and continue with next VCPU and so on.
2293 */
2294 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2295 {
2296 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2297 bool eligible;
2299 eligible = !vcpu->spin_loop.in_spin_loop ||
2300 vcpu->spin_loop.dy_eligible;
2302 if (vcpu->spin_loop.in_spin_loop)
2303 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2305 return eligible;
2306 #else
2307 return true;
2308 #endif
2309 }
2311 void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
2312 {
2313 struct kvm *kvm = me->kvm;
2314 struct kvm_vcpu *vcpu;
2315 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2316 int yielded = 0;
2317 int try = 3;
2318 int pass;
2319 int i;
2321 kvm_vcpu_set_in_spin_loop(me, true);
2322 /*
2323 * We boost the priority of a VCPU that is runnable but not
2324 * currently running, because it got preempted by something
2325 * else and called schedule in __vcpu_run. Hopefully that
2326 * VCPU is holding the lock that we need and will release it.
2327 * We approximate round-robin by starting at the last boosted VCPU.
2328 */
2329 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2330 kvm_for_each_vcpu(i, vcpu, kvm) {
2331 if (!pass && i <= last_boosted_vcpu) {
2332 i = last_boosted_vcpu;
2333 continue;
2334 } else if (pass && i > last_boosted_vcpu)
2335 break;
2336 if (!READ_ONCE(vcpu->preempted))
2337 continue;
2338 if (vcpu == me)
2339 continue;
2340 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2341 continue;
2342 if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu))
2343 continue;
2344 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2345 continue;
2347 yielded = kvm_vcpu_yield_to(vcpu);
2348 if (yielded > 0) {
2349 kvm->last_boosted_vcpu = i;
2350 break;
2351 } else if (yielded < 0) {
2352 try--;
2353 if (!try)
2354 break;
2355 }
2356 }
2357 }
2358 kvm_vcpu_set_in_spin_loop(me, false);
2360 /* Ensure vcpu is not eligible during next spinloop */
2361 kvm_vcpu_set_dy_eligible(me, false);
2362 }
2363 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2365 static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
2366 {
2367 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2368 struct page *page;
2370 if (vmf->pgoff == 0)
2371 page = virt_to_page(vcpu->run);
2372 #ifdef CONFIG_X86
2373 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2374 page = virt_to_page(vcpu->arch.pio_data);
2375 #endif
2376 #ifdef CONFIG_KVM_MMIO
2377 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2378 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2379 #endif
2380 else
2381 return kvm_arch_vcpu_fault(vcpu, vmf);
2382 get_page(page);
2383 vmf->page = page;
2384 return 0;
2385 }
2387 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2388 .fault = kvm_vcpu_fault,
2389 };
2391 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2392 {
2393 vma->vm_ops = &kvm_vcpu_vm_ops;
2394 return 0;
2395 }
2397 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2398 {
2399 struct kvm_vcpu *vcpu = filp->private_data;
2401 debugfs_remove_recursive(vcpu->debugfs_dentry);
2402 kvm_put_kvm(vcpu->kvm);
2403 return 0;
2404 }
2406 static struct file_operations kvm_vcpu_fops = {
2407 .release = kvm_vcpu_release,
2408 .unlocked_ioctl = kvm_vcpu_ioctl,
2409 .mmap = kvm_vcpu_mmap,
2410 .llseek = noop_llseek,
2411 KVM_COMPAT(kvm_vcpu_compat_ioctl),
2412 };
2414 /*
2415 * Allocates an inode for the vcpu.
2416 */
2417 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2418 {
2419 char name[8 + 1 + ITOA_MAX_LEN + 1];
2421 snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id);
2422 return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2423 }
2425 static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2426 {
2427 char dir_name[ITOA_MAX_LEN * 2];
2428 int ret;
2430 if (!kvm_arch_has_vcpu_debugfs())
2431 return 0;
2433 if (!debugfs_initialized())
2434 return 0;
2436 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2437 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2438 vcpu->kvm->debugfs_dentry);
2439 if (!vcpu->debugfs_dentry)
2440 return -ENOMEM;
2442 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2443 if (ret < 0) {
2444 debugfs_remove_recursive(vcpu->debugfs_dentry);
2445 return ret;
2446 }
2448 return 0;
2449 }
2451 /*
2452 * Creates some virtual cpus. Good luck creating more than one.
2453 */
2454 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2455 {
2456 int r;
2457 struct kvm_vcpu *vcpu;
2459 if (id >= KVM_MAX_VCPU_ID)
2460 return -EINVAL;
2462 mutex_lock(&kvm->lock);
2463 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2464 mutex_unlock(&kvm->lock);
2465 return -EINVAL;
2466 }
2468 kvm->created_vcpus++;
2469 mutex_unlock(&kvm->lock);
2471 vcpu = kvm_arch_vcpu_create(kvm, id);
2472 if (IS_ERR(vcpu)) {
2473 r = PTR_ERR(vcpu);
2474 goto vcpu_decrement;
2475 }
2477 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2479 r = kvm_arch_vcpu_setup(vcpu);
2480 if (r)
2481 goto vcpu_destroy;
2483 r = kvm_create_vcpu_debugfs(vcpu);
2484 if (r)
2485 goto vcpu_destroy;
2487 mutex_lock(&kvm->lock);
2488 if (kvm_get_vcpu_by_id(kvm, id)) {
2489 r = -EEXIST;
2490 goto unlock_vcpu_destroy;
2491 }
2493 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2495 /* Now it's all set up, let userspace reach it */
2496 kvm_get_kvm(kvm);
2497 r = create_vcpu_fd(vcpu);
2498 if (r < 0) {
2499 kvm_put_kvm(kvm);
2500 goto unlock_vcpu_destroy;
2501 }
2503 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2505 /*
2506 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2507 * before kvm->online_vcpu's incremented value.
2508 */
2509 smp_wmb();
2510 atomic_inc(&kvm->online_vcpus);
2512 mutex_unlock(&kvm->lock);
2513 kvm_arch_vcpu_postcreate(vcpu);
2514 return r;
2516 unlock_vcpu_destroy:
2517 mutex_unlock(&kvm->lock);
2518 debugfs_remove_recursive(vcpu->debugfs_dentry);
2519 vcpu_destroy:
2520 kvm_arch_vcpu_destroy(vcpu);
2521 vcpu_decrement:
2522 mutex_lock(&kvm->lock);
2523 kvm->created_vcpus--;
2524 mutex_unlock(&kvm->lock);
2525 return r;
2526 }
2528 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2529 {
2530 if (sigset) {
2531 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2532 vcpu->sigset_active = 1;
2533 vcpu->sigset = *sigset;
2534 } else
2535 vcpu->sigset_active = 0;
2536 return 0;
2537 }
2539 static long kvm_vcpu_ioctl(struct file *filp,
2540 unsigned int ioctl, unsigned long arg)
2541 {
2542 struct kvm_vcpu *vcpu = filp->private_data;
2543 void __user *argp = (void __user *)arg;
2544 int r;
2545 struct kvm_fpu *fpu = NULL;
2546 struct kvm_sregs *kvm_sregs = NULL;
2548 if (vcpu->kvm->mm != current->mm)
2549 return -EIO;
2551 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2552 return -EINVAL;
2554 /*
2555 * Some architectures have vcpu ioctls that are asynchronous to vcpu
2556 * execution; mutex_lock() would break them.
2557 */
2558 r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg);
2559 if (r != -ENOIOCTLCMD)
2560 return r;
2562 if (mutex_lock_killable(&vcpu->mutex))
2563 return -EINTR;
2564 switch (ioctl) {
2565 case KVM_RUN: {
2566 struct pid *oldpid;
2567 r = -EINVAL;
2568 if (arg)
2569 goto out;
2570 oldpid = rcu_access_pointer(vcpu->pid);
2571 if (unlikely(oldpid != task_pid(current))) {
2572 /* The thread running this VCPU changed. */
2573 struct pid *newpid;
2575 r = kvm_arch_vcpu_run_pid_change(vcpu);
2576 if (r)
2577 break;
2579 newpid = get_task_pid(current, PIDTYPE_PID);
2580 rcu_assign_pointer(vcpu->pid, newpid);
2581 if (oldpid)
2582 synchronize_rcu();
2583 put_pid(oldpid);
2584 }
2585 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2586 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2587 break;
2588 }
2589 case KVM_GET_REGS: {
2590 struct kvm_regs *kvm_regs;
2592 r = -ENOMEM;
2593 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2594 if (!kvm_regs)
2595 goto out;
2596 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2597 if (r)
2598 goto out_free1;
2599 r = -EFAULT;
2600 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2601 goto out_free1;
2602 r = 0;
2603 out_free1:
2604 kfree(kvm_regs);
2605 break;
2606 }
2607 case KVM_SET_REGS: {
2608 struct kvm_regs *kvm_regs;
2610 r = -ENOMEM;
2611 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2612 if (IS_ERR(kvm_regs)) {
2613 r = PTR_ERR(kvm_regs);
2614 goto out;
2615 }
2616 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2617 kfree(kvm_regs);
2618 break;
2619 }
2620 case KVM_GET_SREGS: {
2621 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2622 r = -ENOMEM;
2623 if (!kvm_sregs)
2624 goto out;
2625 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2626 if (r)
2627 goto out;
2628 r = -EFAULT;
2629 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2630 goto out;
2631 r = 0;
2632 break;
2633 }
2634 case KVM_SET_SREGS: {
2635 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2636 if (IS_ERR(kvm_sregs)) {
2637 r = PTR_ERR(kvm_sregs);
2638 kvm_sregs = NULL;
2639 goto out;
2640 }
2641 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2642 break;
2643 }
2644 case KVM_GET_MP_STATE: {
2645 struct kvm_mp_state mp_state;
2647 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2648 if (r)
2649 goto out;
2650 r = -EFAULT;
2651 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2652 goto out;
2653 r = 0;
2654 break;
2655 }
2656 case KVM_SET_MP_STATE: {
2657 struct kvm_mp_state mp_state;
2659 r = -EFAULT;
2660 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2661 goto out;
2662 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2663 break;
2664 }
2665 case KVM_TRANSLATE: {
2666 struct kvm_translation tr;
2668 r = -EFAULT;
2669 if (copy_from_user(&tr, argp, sizeof(tr)))
2670 goto out;
2671 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2672 if (r)
2673 goto out;
2674 r = -EFAULT;
2675 if (copy_to_user(argp, &tr, sizeof(tr)))
2676 goto out;
2677 r = 0;
2678 break;
2679 }
2680 case KVM_SET_GUEST_DEBUG: {
2681 struct kvm_guest_debug dbg;
2683 r = -EFAULT;
2684 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2685 goto out;
2686 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2687 break;
2688 }
2689 case KVM_SET_SIGNAL_MASK: {
2690 struct kvm_signal_mask __user *sigmask_arg = argp;
2691 struct kvm_signal_mask kvm_sigmask;
2692 sigset_t sigset, *p;
2694 p = NULL;
2695 if (argp) {
2696 r = -EFAULT;
2697 if (copy_from_user(&kvm_sigmask, argp,
2698 sizeof(kvm_sigmask)))
2699 goto out;
2700 r = -EINVAL;
2701 if (kvm_sigmask.len != sizeof(sigset))
2702 goto out;
2703 r = -EFAULT;
2704 if (copy_from_user(&sigset, sigmask_arg->sigset,
2705 sizeof(sigset)))
2706 goto out;
2707 p = &sigset;
2708 }
2709 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2710 break;
2711 }
2712 case KVM_GET_FPU: {
2713 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2714 r = -ENOMEM;
2715 if (!fpu)
2716 goto out;
2717 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2718 if (r)
2719 goto out;
2720 r = -EFAULT;
2721 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2722 goto out;
2723 r = 0;
2724 break;
2725 }
2726 case KVM_SET_FPU: {
2727 fpu = memdup_user(argp, sizeof(*fpu));
2728 if (IS_ERR(fpu)) {
2729 r = PTR_ERR(fpu);
2730 fpu = NULL;
2731 goto out;
2732 }
2733 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2734 break;
2735 }
2736 default:
2737 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2738 }
2739 out:
2740 mutex_unlock(&vcpu->mutex);
2741 kfree(fpu);
2742 kfree(kvm_sregs);
2743 return r;
2744 }
2746 #ifdef CONFIG_KVM_COMPAT
2747 static long kvm_vcpu_compat_ioctl(struct file *filp,
2748 unsigned int ioctl, unsigned long arg)
2749 {
2750 struct kvm_vcpu *vcpu = filp->private_data;
2751 void __user *argp = compat_ptr(arg);
2752 int r;
2754 if (vcpu->kvm->mm != current->mm)
2755 return -EIO;
2757 switch (ioctl) {
2758 case KVM_SET_SIGNAL_MASK: {
2759 struct kvm_signal_mask __user *sigmask_arg = argp;
2760 struct kvm_signal_mask kvm_sigmask;
2761 sigset_t sigset;
2763 if (argp) {
2764 r = -EFAULT;
2765 if (copy_from_user(&kvm_sigmask, argp,
2766 sizeof(kvm_sigmask)))
2767 goto out;
2768 r = -EINVAL;
2769 if (kvm_sigmask.len != sizeof(compat_sigset_t))
2770 goto out;
2771 r = -EFAULT;
2772 if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset))
2773 goto out;
2774 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2775 } else
2776 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2777 break;
2778 }
2779 default:
2780 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2781 }
2783 out:
2784 return r;
2785 }
2786 #endif
2788 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2789 int (*accessor)(struct kvm_device *dev,
2790 struct kvm_device_attr *attr),
2791 unsigned long arg)
2792 {
2793 struct kvm_device_attr attr;
2795 if (!accessor)
2796 return -EPERM;
2798 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2799 return -EFAULT;
2801 return accessor(dev, &attr);
2802 }
2804 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2805 unsigned long arg)
2806 {
2807 struct kvm_device *dev = filp->private_data;
2809 switch (ioctl) {
2810 case KVM_SET_DEVICE_ATTR:
2811 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2812 case KVM_GET_DEVICE_ATTR:
2813 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2814 case KVM_HAS_DEVICE_ATTR:
2815 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2816 default:
2817 if (dev->ops->ioctl)
2818 return dev->ops->ioctl(dev, ioctl, arg);
2820 return -ENOTTY;
2821 }
2822 }
2824 static int kvm_device_release(struct inode *inode, struct file *filp)
2825 {
2826 struct kvm_device *dev = filp->private_data;
2827 struct kvm *kvm = dev->kvm;
2829 kvm_put_kvm(kvm);
2830 return 0;
2831 }
2833 static const struct file_operations kvm_device_fops = {
2834 .unlocked_ioctl = kvm_device_ioctl,
2835 .release = kvm_device_release,
2836 KVM_COMPAT(kvm_device_ioctl),
2837 };
2839 struct kvm_device *kvm_device_from_filp(struct file *filp)
2840 {
2841 if (filp->f_op != &kvm_device_fops)
2842 return NULL;
2844 return filp->private_data;
2845 }
2847 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2848 #ifdef CONFIG_KVM_MPIC
2849 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2850 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2851 #endif
2852 };
2854 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2855 {
2856 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2857 return -ENOSPC;
2859 if (kvm_device_ops_table[type] != NULL)
2860 return -EEXIST;
2862 kvm_device_ops_table[type] = ops;
2863 return 0;
2864 }
2866 void kvm_unregister_device_ops(u32 type)
2867 {
2868 if (kvm_device_ops_table[type] != NULL)
2869 kvm_device_ops_table[type] = NULL;
2870 }
2872 static int kvm_ioctl_create_device(struct kvm *kvm,
2873 struct kvm_create_device *cd)
2874 {
2875 struct kvm_device_ops *ops = NULL;
2876 struct kvm_device *dev;
2877 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2878 int ret;
2880 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2881 return -ENODEV;
2883 ops = kvm_device_ops_table[cd->type];
2884 if (ops == NULL)
2885 return -ENODEV;
2887 if (test)
2888 return 0;
2890 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2891 if (!dev)
2892 return -ENOMEM;
2894 dev->ops = ops;
2895 dev->kvm = kvm;
2897 mutex_lock(&kvm->lock);
2898 ret = ops->create(dev, cd->type);
2899 if (ret < 0) {
2900 mutex_unlock(&kvm->lock);
2901 kfree(dev);
2902 return ret;
2903 }
2904 list_add(&dev->vm_node, &kvm->devices);
2905 mutex_unlock(&kvm->lock);
2907 if (ops->init)
2908 ops->init(dev);
2910 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2911 if (ret < 0) {
2912 mutex_lock(&kvm->lock);
2913 list_del(&dev->vm_node);
2914 mutex_unlock(&kvm->lock);
2915 ops->destroy(dev);
2916 return ret;
2917 }
2919 kvm_get_kvm(kvm);
2920 cd->fd = ret;
2921 return 0;
2922 }
2924 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2925 {
2926 switch (arg) {
2927 case KVM_CAP_USER_MEMORY:
2928 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2929 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2930 case KVM_CAP_INTERNAL_ERROR_DATA:
2931 #ifdef CONFIG_HAVE_KVM_MSI
2932 case KVM_CAP_SIGNAL_MSI:
2933 #endif
2934 #ifdef CONFIG_HAVE_KVM_IRQFD
2935 case KVM_CAP_IRQFD:
2936 case KVM_CAP_IRQFD_RESAMPLE:
2937 #endif
2938 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2939 case KVM_CAP_CHECK_EXTENSION_VM:
2940 return 1;
2941 #ifdef CONFIG_KVM_MMIO
2942 case KVM_CAP_COALESCED_MMIO:
2943 return KVM_COALESCED_MMIO_PAGE_OFFSET;
2944 #endif
2945 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2946 case KVM_CAP_IRQ_ROUTING:
2947 return KVM_MAX_IRQ_ROUTES;
2948 #endif
2949 #if KVM_ADDRESS_SPACE_NUM > 1
2950 case KVM_CAP_MULTI_ADDRESS_SPACE:
2951 return KVM_ADDRESS_SPACE_NUM;
2952 #endif
2953 case KVM_CAP_MAX_VCPU_ID:
2954 return KVM_MAX_VCPU_ID;
2955 default:
2956 break;
2957 }
2958 return kvm_vm_ioctl_check_extension(kvm, arg);
2959 }
2961 static long kvm_vm_ioctl(struct file *filp,
2962 unsigned int ioctl, unsigned long arg)
2963 {
2964 struct kvm *kvm = filp->private_data;
2965 void __user *argp = (void __user *)arg;
2966 int r;
2968 if (kvm->mm != current->mm)
2969 return -EIO;
2970 switch (ioctl) {
2971 case KVM_CREATE_VCPU:
2972 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2973 break;
2974 case KVM_SET_USER_MEMORY_REGION: {
2975 struct kvm_userspace_memory_region kvm_userspace_mem;
2977 r = -EFAULT;
2978 if (copy_from_user(&kvm_userspace_mem, argp,
2979 sizeof(kvm_userspace_mem)))
2980 goto out;
2982 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2983 break;
2984 }
2985 case KVM_GET_DIRTY_LOG: {
2986 struct kvm_dirty_log log;
2988 r = -EFAULT;
2989 if (copy_from_user(&log, argp, sizeof(log)))
2990 goto out;
2991 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2992 break;
2993 }
2994 #ifdef CONFIG_KVM_MMIO
2995 case KVM_REGISTER_COALESCED_MMIO: {
2996 struct kvm_coalesced_mmio_zone zone;
2998 r = -EFAULT;
2999 if (copy_from_user(&zone, argp, sizeof(zone)))
3000 goto out;
3001 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
3002 break;
3003 }
3004 case KVM_UNREGISTER_COALESCED_MMIO: {
3005 struct kvm_coalesced_mmio_zone zone;
3007 r = -EFAULT;
3008 if (copy_from_user(&zone, argp, sizeof(zone)))
3009 goto out;
3010 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
3011 break;
3012 }
3013 #endif
3014 case KVM_IRQFD: {
3015 struct kvm_irqfd data;
3017 r = -EFAULT;
3018 if (copy_from_user(&data, argp, sizeof(data)))
3019 goto out;
3020 r = kvm_irqfd(kvm, &data);
3021 break;
3022 }
3023 case KVM_IOEVENTFD: {
3024 struct kvm_ioeventfd data;
3026 r = -EFAULT;
3027 if (copy_from_user(&data, argp, sizeof(data)))
3028 goto out;
3029 r = kvm_ioeventfd(kvm, &data);
3030 break;
3031 }
3032 #ifdef CONFIG_HAVE_KVM_MSI
3033 case KVM_SIGNAL_MSI: {
3034 struct kvm_msi msi;
3036 r = -EFAULT;
3037 if (copy_from_user(&msi, argp, sizeof(msi)))
3038 goto out;
3039 r = kvm_send_userspace_msi(kvm, &msi);
3040 break;
3041 }
3042 #endif
3043 #ifdef __KVM_HAVE_IRQ_LINE
3044 case KVM_IRQ_LINE_STATUS:
3045 case KVM_IRQ_LINE: {
3046 struct kvm_irq_level irq_event;
3048 r = -EFAULT;
3049 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3050 goto out;
3052 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3053 ioctl == KVM_IRQ_LINE_STATUS);
3054 if (r)
3055 goto out;
3057 r = -EFAULT;
3058 if (ioctl == KVM_IRQ_LINE_STATUS) {
3059 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3060 goto out;
3061 }
3063 r = 0;
3064 break;
3065 }
3066 #endif
3067 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3068 case KVM_SET_GSI_ROUTING: {
3069 struct kvm_irq_routing routing;
3070 struct kvm_irq_routing __user *urouting;
3071 struct kvm_irq_routing_entry *entries = NULL;
3073 r = -EFAULT;
3074 if (copy_from_user(&routing, argp, sizeof(routing)))
3075 goto out;
3076 r = -EINVAL;
3077 if (!kvm_arch_can_set_irq_routing(kvm))
3078 goto out;
3079 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3080 goto out;
3081 if (routing.flags)
3082 goto out;
3083 if (routing.nr) {
3084 r = -ENOMEM;
3085 entries = vmalloc(array_size(sizeof(*entries),
3086 routing.nr));
3087 if (!entries)
3088 goto out;
3089 r = -EFAULT;
3090 urouting = argp;
3091 if (copy_from_user(entries, urouting->entries,
3092 routing.nr * sizeof(*entries)))
3093 goto out_free_irq_routing;
3094 }
3095 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3096 routing.flags);
3097 out_free_irq_routing:
3098 vfree(entries);
3099 break;
3100 }
3101 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3102 case KVM_CREATE_DEVICE: {
3103 struct kvm_create_device cd;
3105 r = -EFAULT;
3106 if (copy_from_user(&cd, argp, sizeof(cd)))
3107 goto out;
3109 r = kvm_ioctl_create_device(kvm, &cd);
3110 if (r)
3111 goto out;
3113 r = -EFAULT;
3114 if (copy_to_user(argp, &cd, sizeof(cd)))
3115 goto out;
3117 r = 0;
3118 break;
3119 }
3120 case KVM_CHECK_EXTENSION:
3121 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3122 break;
3123 default:
3124 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3125 }
3126 out:
3127 return r;
3128 }
3130 #ifdef CONFIG_KVM_COMPAT
3131 struct compat_kvm_dirty_log {
3132 __u32 slot;
3133 __u32 padding1;
3134 union {
3135 compat_uptr_t dirty_bitmap; /* one bit per page */
3136 __u64 padding2;
3137 };
3138 };
3140 static long kvm_vm_compat_ioctl(struct file *filp,
3141 unsigned int ioctl, unsigned long arg)
3142 {
3143 struct kvm *kvm = filp->private_data;
3144 int r;
3146 if (kvm->mm != current->mm)
3147 return -EIO;
3148 switch (ioctl) {
3149 case KVM_GET_DIRTY_LOG: {
3150 struct compat_kvm_dirty_log compat_log;
3151 struct kvm_dirty_log log;
3153 if (copy_from_user(&compat_log, (void __user *)arg,
3154 sizeof(compat_log)))
3155 return -EFAULT;
3156 log.slot = compat_log.slot;
3157 log.padding1 = compat_log.padding1;
3158 log.padding2 = compat_log.padding2;
3159 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3161 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3162 break;
3163 }
3164 default:
3165 r = kvm_vm_ioctl(filp, ioctl, arg);
3166 }
3167 return r;
3168 }
3169 #endif
3171 static struct file_operations kvm_vm_fops = {
3172 .release = kvm_vm_release,
3173 .unlocked_ioctl = kvm_vm_ioctl,
3174 .llseek = noop_llseek,
3175 KVM_COMPAT(kvm_vm_compat_ioctl),
3176 };
3178 static int kvm_dev_ioctl_create_vm(unsigned long type)
3179 {
3180 int r;
3181 struct kvm *kvm;
3182 struct file *file;
3184 kvm = kvm_create_vm(type);
3185 if (IS_ERR(kvm))
3186 return PTR_ERR(kvm);
3187 #ifdef CONFIG_KVM_MMIO
3188 r = kvm_coalesced_mmio_init(kvm);
3189 if (r < 0)
3190 goto put_kvm;
3191 #endif
3192 r = get_unused_fd_flags(O_CLOEXEC);
3193 if (r < 0)
3194 goto put_kvm;
3196 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3197 if (IS_ERR(file)) {
3198 put_unused_fd(r);
3199 r = PTR_ERR(file);
3200 goto put_kvm;
3201 }
3203 /*
3204 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3205 * already set, with ->release() being kvm_vm_release(). In error
3206 * cases it will be called by the final fput(file) and will take
3207 * care of doing kvm_put_kvm(kvm).
3208 */
3209 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3210 put_unused_fd(r);
3211 fput(file);
3212 return -ENOMEM;
3213 }
3214 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3216 fd_install(r, file);
3217 return r;
3219 put_kvm:
3220 kvm_put_kvm(kvm);
3221 return r;
3222 }
3224 static long kvm_dev_ioctl(struct file *filp,
3225 unsigned int ioctl, unsigned long arg)
3226 {
3227 long r = -EINVAL;
3229 switch (ioctl) {
3230 case KVM_GET_API_VERSION:
3231 if (arg)
3232 goto out;
3233 r = KVM_API_VERSION;
3234 break;
3235 case KVM_CREATE_VM:
3236 r = kvm_dev_ioctl_create_vm(arg);
3237 break;
3238 case KVM_CHECK_EXTENSION:
3239 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3240 break;
3241 case KVM_GET_VCPU_MMAP_SIZE:
3242 if (arg)
3243 goto out;
3244 r = PAGE_SIZE; /* struct kvm_run */
3245 #ifdef CONFIG_X86
3246 r += PAGE_SIZE; /* pio data page */
3247 #endif
3248 #ifdef CONFIG_KVM_MMIO
3249 r += PAGE_SIZE; /* coalesced mmio ring page */
3250 #endif
3251 break;
3252 case KVM_TRACE_ENABLE:
3253 case KVM_TRACE_PAUSE:
3254 case KVM_TRACE_DISABLE:
3255 r = -EOPNOTSUPP;
3256 break;
3257 default:
3258 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3259 }
3260 out:
3261 return r;
3262 }
3264 static struct file_operations kvm_chardev_ops = {
3265 .unlocked_ioctl = kvm_dev_ioctl,
3266 .llseek = noop_llseek,
3267 KVM_COMPAT(kvm_dev_ioctl),
3268 };
3270 static struct miscdevice kvm_dev = {
3271 KVM_MINOR,
3272 "kvm",
3273 &kvm_chardev_ops,
3274 };
3276 static void hardware_enable_nolock(void *junk)
3277 {
3278 int cpu = raw_smp_processor_id();
3279 int r;
3281 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3282 return;
3284 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3286 r = kvm_arch_hardware_enable();
3288 if (r) {
3289 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3290 atomic_inc(&hardware_enable_failed);
3291 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3292 }
3293 }
3295 static int kvm_starting_cpu(unsigned int cpu)
3296 {
3297 raw_spin_lock(&kvm_count_lock);
3298 if (kvm_usage_count)
3299 hardware_enable_nolock(NULL);
3300 raw_spin_unlock(&kvm_count_lock);
3301 return 0;
3302 }
3304 static void hardware_disable_nolock(void *junk)
3305 {
3306 int cpu = raw_smp_processor_id();
3308 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3309 return;
3310 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3311 kvm_arch_hardware_disable();
3312 }
3314 static int kvm_dying_cpu(unsigned int cpu)
3315 {
3316 raw_spin_lock(&kvm_count_lock);
3317 if (kvm_usage_count)
3318 hardware_disable_nolock(NULL);
3319 raw_spin_unlock(&kvm_count_lock);
3320 return 0;
3321 }
3323 static void hardware_disable_all_nolock(void)
3324 {
3325 BUG_ON(!kvm_usage_count);
3327 kvm_usage_count--;
3328 if (!kvm_usage_count)
3329 on_each_cpu(hardware_disable_nolock, NULL, 1);
3330 }
3332 static void hardware_disable_all(void)
3333 {
3334 raw_spin_lock(&kvm_count_lock);
3335 hardware_disable_all_nolock();
3336 raw_spin_unlock(&kvm_count_lock);
3337 }
3339 static int hardware_enable_all(void)
3340 {
3341 int r = 0;
3343 raw_spin_lock(&kvm_count_lock);
3345 kvm_usage_count++;
3346 if (kvm_usage_count == 1) {
3347 atomic_set(&hardware_enable_failed, 0);
3348 on_each_cpu(hardware_enable_nolock, NULL, 1);
3350 if (atomic_read(&hardware_enable_failed)) {
3351 hardware_disable_all_nolock();
3352 r = -EBUSY;
3353 }
3354 }
3356 raw_spin_unlock(&kvm_count_lock);
3358 return r;
3359 }
3361 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3362 void *v)
3363 {
3364 /*
3365 * Some (well, at least mine) BIOSes hang on reboot if
3366 * in vmx root mode.
3367 *
3368 * And Intel TXT required VMX off for all cpu when system shutdown.
3369 */
3370 pr_info("kvm: exiting hardware virtualization\n");
3371 kvm_rebooting = true;
3372 on_each_cpu(hardware_disable_nolock, NULL, 1);
3373 return NOTIFY_OK;
3374 }
3376 static struct notifier_block kvm_reboot_notifier = {
3377 .notifier_call = kvm_reboot,
3378 .priority = 0,
3379 };
3381 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3382 {
3383 int i;
3385 for (i = 0; i < bus->dev_count; i++) {
3386 struct kvm_io_device *pos = bus->range[i].dev;
3388 kvm_iodevice_destructor(pos);
3389 }
3390 kfree(bus);
3391 }
3393 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3394 const struct kvm_io_range *r2)
3395 {
3396 gpa_t addr1 = r1->addr;
3397 gpa_t addr2 = r2->addr;
3399 if (addr1 < addr2)
3400 return -1;
3402 /* If r2->len == 0, match the exact address. If r2->len != 0,
3403 * accept any overlapping write. Any order is acceptable for
3404 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3405 * we process all of them.
3406 */
3407 if (r2->len) {
3408 addr1 += r1->len;
3409 addr2 += r2->len;
3410 }
3412 if (addr1 > addr2)
3413 return 1;
3415 return 0;
3416 }
3418 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3419 {
3420 return kvm_io_bus_cmp(p1, p2);
3421 }
3423 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3424 gpa_t addr, int len)
3425 {
3426 struct kvm_io_range *range, key;
3427 int off;
3429 key = (struct kvm_io_range) {
3430 .addr = addr,
3431 .len = len,
3432 };
3434 range = bsearch(&key, bus->range, bus->dev_count,
3435 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3436 if (range == NULL)
3437 return -ENOENT;
3439 off = range - bus->range;
3441 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3442 off--;
3444 return off;
3445 }
3447 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3448 struct kvm_io_range *range, const void *val)
3449 {
3450 int idx;
3452 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3453 if (idx < 0)
3454 return -EOPNOTSUPP;
3456 while (idx < bus->dev_count &&
3457 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3458 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3459 range->len, val))
3460 return idx;
3461 idx++;
3462 }
3464 return -EOPNOTSUPP;
3465 }
3467 /* kvm_io_bus_write - called under kvm->slots_lock */
3468 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3469 int len, const void *val)
3470 {
3471 struct kvm_io_bus *bus;
3472 struct kvm_io_range range;
3473 int r;
3475 range = (struct kvm_io_range) {
3476 .addr = addr,
3477 .len = len,
3478 };
3480 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3481 if (!bus)
3482 return -ENOMEM;
3483 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3484 return r < 0 ? r : 0;
3485 }
3487 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3488 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3489 gpa_t addr, int len, const void *val, long cookie)
3490 {
3491 struct kvm_io_bus *bus;
3492 struct kvm_io_range range;
3494 range = (struct kvm_io_range) {
3495 .addr = addr,
3496 .len = len,
3497 };
3499 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3500 if (!bus)
3501 return -ENOMEM;
3503 /* First try the device referenced by cookie. */
3504 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3505 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3506 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3507 val))
3508 return cookie;
3510 /*
3511 * cookie contained garbage; fall back to search and return the
3512 * correct cookie value.
3513 */
3514 return __kvm_io_bus_write(vcpu, bus, &range, val);
3515 }
3517 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3518 struct kvm_io_range *range, void *val)
3519 {
3520 int idx;
3522 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3523 if (idx < 0)
3524 return -EOPNOTSUPP;
3526 while (idx < bus->dev_count &&
3527 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3528 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3529 range->len, val))
3530 return idx;
3531 idx++;
3532 }
3534 return -EOPNOTSUPP;
3535 }
3536 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3538 /* kvm_io_bus_read - called under kvm->slots_lock */
3539 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3540 int len, void *val)
3541 {
3542 struct kvm_io_bus *bus;
3543 struct kvm_io_range range;
3544 int r;
3546 range = (struct kvm_io_range) {
3547 .addr = addr,
3548 .len = len,
3549 };
3551 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3552 if (!bus)
3553 return -ENOMEM;
3554 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3555 return r < 0 ? r : 0;
3556 }
3559 /* Caller must hold slots_lock. */
3560 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3561 int len, struct kvm_io_device *dev)
3562 {
3563 int i;
3564 struct kvm_io_bus *new_bus, *bus;
3565 struct kvm_io_range range;
3567 bus = kvm_get_bus(kvm, bus_idx);
3568 if (!bus)
3569 return -ENOMEM;
3571 /* exclude ioeventfd which is limited by maximum fd */
3572 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3573 return -ENOSPC;
3575 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3576 sizeof(struct kvm_io_range)), GFP_KERNEL);
3577 if (!new_bus)
3578 return -ENOMEM;
3580 range = (struct kvm_io_range) {
3581 .addr = addr,
3582 .len = len,
3583 .dev = dev,
3584 };
3586 for (i = 0; i < bus->dev_count; i++)
3587 if (kvm_io_bus_cmp(&bus->range[i], &range) > 0)
3588 break;
3590 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3591 new_bus->dev_count++;
3592 new_bus->range[i] = range;
3593 memcpy(new_bus->range + i + 1, bus->range + i,
3594 (bus->dev_count - i) * sizeof(struct kvm_io_range));
3595 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3596 synchronize_srcu_expedited(&kvm->srcu);
3597 kfree(bus);
3599 return 0;
3600 }
3602 /* Caller must hold slots_lock. */
3603 void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3604 struct kvm_io_device *dev)
3605 {
3606 int i;
3607 struct kvm_io_bus *new_bus, *bus;
3609 bus = kvm_get_bus(kvm, bus_idx);
3610 if (!bus)
3611 return;
3613 for (i = 0; i < bus->dev_count; i++)
3614 if (bus->range[i].dev == dev) {
3615 break;
3616 }
3618 if (i == bus->dev_count)
3619 return;
3621 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3622 sizeof(struct kvm_io_range)), GFP_KERNEL);
3623 if (!new_bus) {
3624 pr_err("kvm: failed to shrink bus, removing it completely\n");
3625 goto broken;
3626 }
3628 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3629 new_bus->dev_count--;
3630 memcpy(new_bus->range + i, bus->range + i + 1,
3631 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3633 broken:
3634 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3635 synchronize_srcu_expedited(&kvm->srcu);
3636 kfree(bus);
3637 return;
3638 }
3640 struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3641 gpa_t addr)
3642 {
3643 struct kvm_io_bus *bus;
3644 int dev_idx, srcu_idx;
3645 struct kvm_io_device *iodev = NULL;
3647 srcu_idx = srcu_read_lock(&kvm->srcu);
3649 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3650 if (!bus)
3651 goto out_unlock;
3653 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3654 if (dev_idx < 0)
3655 goto out_unlock;
3657 iodev = bus->range[dev_idx].dev;
3659 out_unlock:
3660 srcu_read_unlock(&kvm->srcu, srcu_idx);
3662 return iodev;
3663 }
3664 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3666 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3667 int (*get)(void *, u64 *), int (*set)(void *, u64),
3668 const char *fmt)
3669 {
3670 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3671 inode->i_private;
3673 /* The debugfs files are a reference to the kvm struct which
3674 * is still valid when kvm_destroy_vm is called.
3675 * To avoid the race between open and the removal of the debugfs
3676 * directory we test against the users count.
3677 */
3678 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3679 return -ENOENT;
3681 if (simple_attr_open(inode, file, get, set, fmt)) {
3682 kvm_put_kvm(stat_data->kvm);
3683 return -ENOMEM;
3684 }
3686 return 0;
3687 }
3689 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3690 {
3691 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3692 inode->i_private;
3694 simple_attr_release(inode, file);
3695 kvm_put_kvm(stat_data->kvm);
3697 return 0;
3698 }
3700 static int vm_stat_get_per_vm(void *data, u64 *val)
3701 {
3702 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3704 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3706 return 0;
3707 }
3709 static int vm_stat_clear_per_vm(void *data, u64 val)
3710 {
3711 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3713 if (val)
3714 return -EINVAL;
3716 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3718 return 0;
3719 }
3721 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3722 {
3723 __simple_attr_check_format("%llu\n", 0ull);
3724 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3725 vm_stat_clear_per_vm, "%llu\n");
3726 }
3728 static const struct file_operations vm_stat_get_per_vm_fops = {
3729 .owner = THIS_MODULE,
3730 .open = vm_stat_get_per_vm_open,
3731 .release = kvm_debugfs_release,
3732 .read = simple_attr_read,
3733 .write = simple_attr_write,
3734 .llseek = no_llseek,
3735 };
3737 static int vcpu_stat_get_per_vm(void *data, u64 *val)
3738 {
3739 int i;
3740 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3741 struct kvm_vcpu *vcpu;
3743 *val = 0;
3745 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3746 *val += *(u64 *)((void *)vcpu + stat_data->offset);
3748 return 0;
3749 }
3751 static int vcpu_stat_clear_per_vm(void *data, u64 val)
3752 {
3753 int i;
3754 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3755 struct kvm_vcpu *vcpu;
3757 if (val)
3758 return -EINVAL;
3760 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3761 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
3763 return 0;
3764 }
3766 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3767 {
3768 __simple_attr_check_format("%llu\n", 0ull);
3769 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3770 vcpu_stat_clear_per_vm, "%llu\n");
3771 }
3773 static const struct file_operations vcpu_stat_get_per_vm_fops = {
3774 .owner = THIS_MODULE,
3775 .open = vcpu_stat_get_per_vm_open,
3776 .release = kvm_debugfs_release,
3777 .read = simple_attr_read,
3778 .write = simple_attr_write,
3779 .llseek = no_llseek,
3780 };
3782 static const struct file_operations *stat_fops_per_vm[] = {
3783 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3784 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
3785 };
3787 static int vm_stat_get(void *_offset, u64 *val)
3788 {
3789 unsigned offset = (long)_offset;
3790 struct kvm *kvm;
3791 struct kvm_stat_data stat_tmp = {.offset = offset};
3792 u64 tmp_val;
3794 *val = 0;
3795 spin_lock(&kvm_lock);
3796 list_for_each_entry(kvm, &vm_list, vm_list) {
3797 stat_tmp.kvm = kvm;
3798 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3799 *val += tmp_val;
3800 }
3801 spin_unlock(&kvm_lock);
3802 return 0;
3803 }
3805 static int vm_stat_clear(void *_offset, u64 val)
3806 {
3807 unsigned offset = (long)_offset;
3808 struct kvm *kvm;
3809 struct kvm_stat_data stat_tmp = {.offset = offset};
3811 if (val)
3812 return -EINVAL;
3814 spin_lock(&kvm_lock);
3815 list_for_each_entry(kvm, &vm_list, vm_list) {
3816 stat_tmp.kvm = kvm;
3817 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
3818 }
3819 spin_unlock(&kvm_lock);
3821 return 0;
3822 }
3824 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
3826 static int vcpu_stat_get(void *_offset, u64 *val)
3827 {
3828 unsigned offset = (long)_offset;
3829 struct kvm *kvm;
3830 struct kvm_stat_data stat_tmp = {.offset = offset};
3831 u64 tmp_val;
3833 *val = 0;
3834 spin_lock(&kvm_lock);
3835 list_for_each_entry(kvm, &vm_list, vm_list) {
3836 stat_tmp.kvm = kvm;
3837 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3838 *val += tmp_val;
3839 }
3840 spin_unlock(&kvm_lock);
3841 return 0;
3842 }
3844 static int vcpu_stat_clear(void *_offset, u64 val)
3845 {
3846 unsigned offset = (long)_offset;
3847 struct kvm *kvm;
3848 struct kvm_stat_data stat_tmp = {.offset = offset};
3850 if (val)
3851 return -EINVAL;
3853 spin_lock(&kvm_lock);
3854 list_for_each_entry(kvm, &vm_list, vm_list) {
3855 stat_tmp.kvm = kvm;
3856 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
3857 }
3858 spin_unlock(&kvm_lock);
3860 return 0;
3861 }
3863 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
3864 "%llu\n");
3866 static const struct file_operations *stat_fops[] = {
3867 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3868 [KVM_STAT_VM] = &vm_stat_fops,
3869 };
3871 static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
3872 {
3873 struct kobj_uevent_env *env;
3874 unsigned long long created, active;
3876 if (!kvm_dev.this_device || !kvm)
3877 return;
3879 spin_lock(&kvm_lock);
3880 if (type == KVM_EVENT_CREATE_VM) {
3881 kvm_createvm_count++;
3882 kvm_active_vms++;
3883 } else if (type == KVM_EVENT_DESTROY_VM) {
3884 kvm_active_vms--;
3885 }
3886 created = kvm_createvm_count;
3887 active = kvm_active_vms;
3888 spin_unlock(&kvm_lock);
3890 env = kzalloc(sizeof(*env), GFP_KERNEL);
3891 if (!env)
3892 return;
3894 add_uevent_var(env, "CREATED=%llu", created);
3895 add_uevent_var(env, "COUNT=%llu", active);
3897 if (type == KVM_EVENT_CREATE_VM) {
3898 add_uevent_var(env, "EVENT=create");
3899 kvm->userspace_pid = task_pid_nr(current);
3900 } else if (type == KVM_EVENT_DESTROY_VM) {
3901 add_uevent_var(env, "EVENT=destroy");
3902 }
3903 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
3905 if (kvm->debugfs_dentry) {
3906 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
3908 if (p) {
3909 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
3910 if (!IS_ERR(tmp))
3911 add_uevent_var(env, "STATS_PATH=%s", tmp);
3912 kfree(p);
3913 }
3914 }
3915 /* no need for checks, since we are adding at most only 5 keys */
3916 env->envp[env->envp_idx++] = NULL;
3917 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
3918 kfree(env);
3919 }
3921 static void kvm_init_debug(void)
3922 {
3923 struct kvm_stats_debugfs_item *p;
3925 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3927 kvm_debugfs_num_entries = 0;
3928 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3929 debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
3930 (void *)(long)p->offset,
3931 stat_fops[p->kind]);
3932 }
3933 }
3935 static int kvm_suspend(void)
3936 {
3937 if (kvm_usage_count)
3938 hardware_disable_nolock(NULL);
3939 return 0;
3940 }
3942 static void kvm_resume(void)
3943 {
3944 if (kvm_usage_count) {
3945 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3946 hardware_enable_nolock(NULL);
3947 }
3948 }
3950 static struct syscore_ops kvm_syscore_ops = {
3951 .suspend = kvm_suspend,
3952 .resume = kvm_resume,
3953 };
3955 static inline
3956 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3957 {
3958 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3959 }
3961 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3962 {
3963 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3965 if (vcpu->preempted)
3966 vcpu->preempted = false;
3968 kvm_arch_sched_in(vcpu, cpu);
3970 kvm_arch_vcpu_load(vcpu, cpu);
3971 }
3973 static void kvm_sched_out(struct preempt_notifier *pn,
3974 struct task_struct *next)
3975 {
3976 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3978 if (current->state == TASK_RUNNING)
3979 vcpu->preempted = true;
3980 kvm_arch_vcpu_put(vcpu);
3981 }
3983 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3984 struct module *module)
3985 {
3986 int r;
3987 int cpu;
3989 r = kvm_arch_init(opaque);
3990 if (r)
3991 goto out_fail;
3993 /*
3994 * kvm_arch_init makes sure there's at most one caller
3995 * for architectures that support multiple implementations,
3996 * like intel and amd on x86.
3997 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3998 * conflicts in case kvm is already setup for another implementation.
3999 */
4000 r = kvm_irqfd_init();
4001 if (r)
4002 goto out_irqfd;
4004 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
4005 r = -ENOMEM;
4006 goto out_free_0;
4007 }
4009 r = kvm_arch_hardware_setup();
4010 if (r < 0)
4011 goto out_free_0a;
4013 for_each_online_cpu(cpu) {
4014 smp_call_function_single(cpu,
4015 kvm_arch_check_processor_compat,
4016 &r, 1);
4017 if (r < 0)
4018 goto out_free_1;
4019 }
4021 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4022 kvm_starting_cpu, kvm_dying_cpu);
4023 if (r)
4024 goto out_free_2;
4025 register_reboot_notifier(&kvm_reboot_notifier);
4027 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4028 if (!vcpu_align)
4029 vcpu_align = __alignof__(struct kvm_vcpu);
4030 kvm_vcpu_cache =
4031 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
4032 SLAB_ACCOUNT,
4033 offsetof(struct kvm_vcpu, arch),
4034 sizeof_field(struct kvm_vcpu, arch),
4035 NULL);
4036 if (!kvm_vcpu_cache) {
4037 r = -ENOMEM;
4038 goto out_free_3;
4039 }
4041 r = kvm_async_pf_init();
4042 if (r)
4043 goto out_free;
4045 kvm_chardev_ops.owner = module;
4046 kvm_vm_fops.owner = module;
4047 kvm_vcpu_fops.owner = module;
4049 r = misc_register(&kvm_dev);
4050 if (r) {
4051 pr_err("kvm: misc device register failed\n");
4052 goto out_unreg;
4053 }
4055 register_syscore_ops(&kvm_syscore_ops);
4057 kvm_preempt_ops.sched_in = kvm_sched_in;
4058 kvm_preempt_ops.sched_out = kvm_sched_out;
4060 kvm_init_debug();
4062 r = kvm_vfio_ops_init();
4063 WARN_ON(r);
4065 return 0;
4067 out_unreg:
4068 kvm_async_pf_deinit();
4069 out_free:
4070 kmem_cache_destroy(kvm_vcpu_cache);
4071 out_free_3:
4072 unregister_reboot_notifier(&kvm_reboot_notifier);
4073 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4074 out_free_2:
4075 out_free_1:
4076 kvm_arch_hardware_unsetup();
4077 out_free_0a:
4078 free_cpumask_var(cpus_hardware_enabled);
4079 out_free_0:
4080 kvm_irqfd_exit();
4081 out_irqfd:
4082 kvm_arch_exit();
4083 out_fail:
4084 return r;
4085 }
4086 EXPORT_SYMBOL_GPL(kvm_init);
4088 void kvm_exit(void)
4089 {
4090 debugfs_remove_recursive(kvm_debugfs_dir);
4091 misc_deregister(&kvm_dev);
4092 kmem_cache_destroy(kvm_vcpu_cache);
4093 kvm_async_pf_deinit();
4094 unregister_syscore_ops(&kvm_syscore_ops);
4095 unregister_reboot_notifier(&kvm_reboot_notifier);
4096 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4097 on_each_cpu(hardware_disable_nolock, NULL, 1);
4098 kvm_arch_hardware_unsetup();
4099 kvm_arch_exit();
4100 kvm_irqfd_exit();
4101 free_cpumask_var(cpus_hardware_enabled);
4102 kvm_vfio_ops_exit();
4103 }
4104 EXPORT_SYMBOL_GPL(kvm_exit);