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19#include <kvm/iodev.h>
20
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>
54
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>
60
61#include "coalesced_mmio.h"
62#include "async_pf.h"
63#include "vfio.h"
64
65#define CREATE_TRACE_POINTS
66#include <trace/events/kvm.h>
67
68
69#define ITOA_MAX_LEN 12
70
71MODULE_AUTHOR("Qumranet");
72MODULE_LICENSE("GPL");
73
74
75unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
76module_param(halt_poll_ns, uint, 0644);
77EXPORT_SYMBOL_GPL(halt_poll_ns);
78
79
80unsigned int halt_poll_ns_grow = 2;
81module_param(halt_poll_ns_grow, uint, 0644);
82EXPORT_SYMBOL_GPL(halt_poll_ns_grow);
83
84
85unsigned int halt_poll_ns_shrink;
86module_param(halt_poll_ns_shrink, uint, 0644);
87EXPORT_SYMBOL_GPL(halt_poll_ns_shrink);
88
89
90
91
92
93
94
95DEFINE_SPINLOCK(kvm_lock);
96static DEFINE_RAW_SPINLOCK(kvm_count_lock);
97LIST_HEAD(vm_list);
98
99static cpumask_var_t cpus_hardware_enabled;
100static int kvm_usage_count;
101static atomic_t hardware_enable_failed;
102
103struct kmem_cache *kvm_vcpu_cache;
104EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
105
106static __read_mostly struct preempt_ops kvm_preempt_ops;
107
108struct dentry *kvm_debugfs_dir;
109EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
110
111static int kvm_debugfs_num_entries;
112static const struct file_operations *stat_fops_per_vm[];
113
114static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
115 unsigned long arg);
116#ifdef CONFIG_KVM_COMPAT
117static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
118 unsigned long arg);
119#endif
120static int hardware_enable_all(void);
121static void hardware_disable_all(void);
122
123static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
124
125static void kvm_release_pfn_dirty(kvm_pfn_t pfn);
126static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
127
128__visible bool kvm_rebooting;
129EXPORT_SYMBOL_GPL(kvm_rebooting);
130
131static bool largepages_enabled = true;
132
133#define KVM_EVENT_CREATE_VM 0
134#define KVM_EVENT_DESTROY_VM 1
135static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm);
136static unsigned long long kvm_createvm_count;
137static unsigned long long kvm_active_vms;
138
139bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
140{
141 if (pfn_valid(pfn))
142 return PageReserved(pfn_to_page(pfn));
143
144 return true;
145}
146
147
148
149
150int vcpu_load(struct kvm_vcpu *vcpu)
151{
152 int cpu;
153
154 if (mutex_lock_killable(&vcpu->mutex))
155 return -EINTR;
156 cpu = get_cpu();
157 preempt_notifier_register(&vcpu->preempt_notifier);
158 kvm_arch_vcpu_load(vcpu, cpu);
159 put_cpu();
160 return 0;
161}
162EXPORT_SYMBOL_GPL(vcpu_load);
163
164void vcpu_put(struct kvm_vcpu *vcpu)
165{
166 preempt_disable();
167 kvm_arch_vcpu_put(vcpu);
168 preempt_notifier_unregister(&vcpu->preempt_notifier);
169 preempt_enable();
170 mutex_unlock(&vcpu->mutex);
171}
172EXPORT_SYMBOL_GPL(vcpu_put);
173
174
175static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req)
176{
177 int mode = kvm_vcpu_exiting_guest_mode(vcpu);
178
179
180
181
182
183 if (req & KVM_REQUEST_WAIT)
184 return mode != OUTSIDE_GUEST_MODE;
185
186
187
188
189 return mode == IN_GUEST_MODE;
190}
191
192static void ack_flush(void *_completed)
193{
194}
195
196static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
197{
198 if (unlikely(!cpus))
199 cpus = cpu_online_mask;
200
201 if (cpumask_empty(cpus))
202 return false;
203
204 smp_call_function_many(cpus, ack_flush, NULL, wait);
205 return true;
206}
207
208bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
209{
210 int i, cpu, me;
211 cpumask_var_t cpus;
212 bool called;
213 struct kvm_vcpu *vcpu;
214
215 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
216
217 me = get_cpu();
218 kvm_for_each_vcpu(i, vcpu, kvm) {
219 kvm_make_request(req, vcpu);
220 cpu = vcpu->cpu;
221
222 if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
223 continue;
224
225 if (cpus != NULL && cpu != -1 && cpu != me &&
226 kvm_request_needs_ipi(vcpu, req))
227 __cpumask_set_cpu(cpu, cpus);
228 }
229 called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT));
230 put_cpu();
231 free_cpumask_var(cpus);
232 return called;
233}
234
235#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
236void kvm_flush_remote_tlbs(struct kvm *kvm)
237{
238
239
240
241
242 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
243
244
245
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251
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253
254
255 if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
256 ++kvm->stat.remote_tlb_flush;
257 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
258}
259EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
260#endif
261
262void kvm_reload_remote_mmus(struct kvm *kvm)
263{
264 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
265}
266
267int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
268{
269 struct page *page;
270 int r;
271
272 mutex_init(&vcpu->mutex);
273 vcpu->cpu = -1;
274 vcpu->kvm = kvm;
275 vcpu->vcpu_id = id;
276 vcpu->pid = NULL;
277 init_swait_queue_head(&vcpu->wq);
278 kvm_async_pf_vcpu_init(vcpu);
279
280 vcpu->pre_pcpu = -1;
281 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
282
283 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
284 if (!page) {
285 r = -ENOMEM;
286 goto fail;
287 }
288 vcpu->run = page_address(page);
289
290 kvm_vcpu_set_in_spin_loop(vcpu, false);
291 kvm_vcpu_set_dy_eligible(vcpu, false);
292 vcpu->preempted = false;
293
294 r = kvm_arch_vcpu_init(vcpu);
295 if (r < 0)
296 goto fail_free_run;
297 return 0;
298
299fail_free_run:
300 free_page((unsigned long)vcpu->run);
301fail:
302 return r;
303}
304EXPORT_SYMBOL_GPL(kvm_vcpu_init);
305
306void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
307{
308
309
310
311
312
313 put_pid(rcu_dereference_protected(vcpu->pid, 1));
314 kvm_arch_vcpu_uninit(vcpu);
315 free_page((unsigned long)vcpu->run);
316}
317EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
318
319#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
320static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
321{
322 return container_of(mn, struct kvm, mmu_notifier);
323}
324
325static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
326 struct mm_struct *mm,
327 unsigned long address,
328 pte_t pte)
329{
330 struct kvm *kvm = mmu_notifier_to_kvm(mn);
331 int idx;
332
333 idx = srcu_read_lock(&kvm->srcu);
334 spin_lock(&kvm->mmu_lock);
335 kvm->mmu_notifier_seq++;
336 kvm_set_spte_hva(kvm, address, pte);
337 spin_unlock(&kvm->mmu_lock);
338 srcu_read_unlock(&kvm->srcu, idx);
339}
340
341static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
342 struct mm_struct *mm,
343 unsigned long start,
344 unsigned long end)
345{
346 struct kvm *kvm = mmu_notifier_to_kvm(mn);
347 int need_tlb_flush = 0, idx;
348
349 idx = srcu_read_lock(&kvm->srcu);
350 spin_lock(&kvm->mmu_lock);
351
352
353
354
355
356 kvm->mmu_notifier_count++;
357 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
358 need_tlb_flush |= kvm->tlbs_dirty;
359
360 if (need_tlb_flush)
361 kvm_flush_remote_tlbs(kvm);
362
363 spin_unlock(&kvm->mmu_lock);
364 srcu_read_unlock(&kvm->srcu, idx);
365}
366
367static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
368 struct mm_struct *mm,
369 unsigned long start,
370 unsigned long end)
371{
372 struct kvm *kvm = mmu_notifier_to_kvm(mn);
373
374 spin_lock(&kvm->mmu_lock);
375
376
377
378
379
380 kvm->mmu_notifier_seq++;
381 smp_wmb();
382
383
384
385
386
387 kvm->mmu_notifier_count--;
388 spin_unlock(&kvm->mmu_lock);
389
390 BUG_ON(kvm->mmu_notifier_count < 0);
391}
392
393static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
394 struct mm_struct *mm,
395 unsigned long start,
396 unsigned long end)
397{
398 struct kvm *kvm = mmu_notifier_to_kvm(mn);
399 int young, idx;
400
401 idx = srcu_read_lock(&kvm->srcu);
402 spin_lock(&kvm->mmu_lock);
403
404 young = kvm_age_hva(kvm, start, end);
405 if (young)
406 kvm_flush_remote_tlbs(kvm);
407
408 spin_unlock(&kvm->mmu_lock);
409 srcu_read_unlock(&kvm->srcu, idx);
410
411 return young;
412}
413
414static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
415 struct mm_struct *mm,
416 unsigned long start,
417 unsigned long end)
418{
419 struct kvm *kvm = mmu_notifier_to_kvm(mn);
420 int young, idx;
421
422 idx = srcu_read_lock(&kvm->srcu);
423 spin_lock(&kvm->mmu_lock);
424
425
426
427
428
429
430
431
432
433
434
435
436
437 young = kvm_age_hva(kvm, start, end);
438 spin_unlock(&kvm->mmu_lock);
439 srcu_read_unlock(&kvm->srcu, idx);
440
441 return young;
442}
443
444static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
445 struct mm_struct *mm,
446 unsigned long address)
447{
448 struct kvm *kvm = mmu_notifier_to_kvm(mn);
449 int young, idx;
450
451 idx = srcu_read_lock(&kvm->srcu);
452 spin_lock(&kvm->mmu_lock);
453 young = kvm_test_age_hva(kvm, address);
454 spin_unlock(&kvm->mmu_lock);
455 srcu_read_unlock(&kvm->srcu, idx);
456
457 return young;
458}
459
460static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
461 struct mm_struct *mm)
462{
463 struct kvm *kvm = mmu_notifier_to_kvm(mn);
464 int idx;
465
466 idx = srcu_read_lock(&kvm->srcu);
467 kvm_arch_flush_shadow_all(kvm);
468 srcu_read_unlock(&kvm->srcu, idx);
469}
470
471static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
472 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
473 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
474 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
475 .clear_young = kvm_mmu_notifier_clear_young,
476 .test_young = kvm_mmu_notifier_test_young,
477 .change_pte = kvm_mmu_notifier_change_pte,
478 .release = kvm_mmu_notifier_release,
479};
480
481static int kvm_init_mmu_notifier(struct kvm *kvm)
482{
483 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
484 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
485}
486
487#else
488
489static int kvm_init_mmu_notifier(struct kvm *kvm)
490{
491 return 0;
492}
493
494#endif
495
496static struct kvm_memslots *kvm_alloc_memslots(void)
497{
498 int i;
499 struct kvm_memslots *slots;
500
501 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
502 if (!slots)
503 return NULL;
504
505 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
506 slots->id_to_index[i] = slots->memslots[i].id = i;
507
508 return slots;
509}
510
511static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
512{
513 if (!memslot->dirty_bitmap)
514 return;
515
516 kvfree(memslot->dirty_bitmap);
517 memslot->dirty_bitmap = NULL;
518}
519
520
521
522
523static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
524 struct kvm_memory_slot *dont)
525{
526 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
527 kvm_destroy_dirty_bitmap(free);
528
529 kvm_arch_free_memslot(kvm, free, dont);
530
531 free->npages = 0;
532}
533
534static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
535{
536 struct kvm_memory_slot *memslot;
537
538 if (!slots)
539 return;
540
541 kvm_for_each_memslot(memslot, slots)
542 kvm_free_memslot(kvm, memslot, NULL);
543
544 kvfree(slots);
545}
546
547static void kvm_destroy_vm_debugfs(struct kvm *kvm)
548{
549 int i;
550
551 if (!kvm->debugfs_dentry)
552 return;
553
554 debugfs_remove_recursive(kvm->debugfs_dentry);
555
556 if (kvm->debugfs_stat_data) {
557 for (i = 0; i < kvm_debugfs_num_entries; i++)
558 kfree(kvm->debugfs_stat_data[i]);
559 kfree(kvm->debugfs_stat_data);
560 }
561}
562
563static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
564{
565 char dir_name[ITOA_MAX_LEN * 2];
566 struct kvm_stat_data *stat_data;
567 struct kvm_stats_debugfs_item *p;
568
569 if (!debugfs_initialized())
570 return 0;
571
572 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
573 kvm->debugfs_dentry = debugfs_create_dir(dir_name,
574 kvm_debugfs_dir);
575 if (!kvm->debugfs_dentry)
576 return -ENOMEM;
577
578 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
579 sizeof(*kvm->debugfs_stat_data),
580 GFP_KERNEL);
581 if (!kvm->debugfs_stat_data)
582 return -ENOMEM;
583
584 for (p = debugfs_entries; p->name; p++) {
585 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
586 if (!stat_data)
587 return -ENOMEM;
588
589 stat_data->kvm = kvm;
590 stat_data->offset = p->offset;
591 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
592 if (!debugfs_create_file(p->name, 0644,
593 kvm->debugfs_dentry,
594 stat_data,
595 stat_fops_per_vm[p->kind]))
596 return -ENOMEM;
597 }
598 return 0;
599}
600
601static struct kvm *kvm_create_vm(unsigned long type)
602{
603 int r, i;
604 struct kvm *kvm = kvm_arch_alloc_vm();
605
606 if (!kvm)
607 return ERR_PTR(-ENOMEM);
608
609 spin_lock_init(&kvm->mmu_lock);
610 mmgrab(current->mm);
611 kvm->mm = current->mm;
612 kvm_eventfd_init(kvm);
613 mutex_init(&kvm->lock);
614 mutex_init(&kvm->irq_lock);
615 mutex_init(&kvm->slots_lock);
616 refcount_set(&kvm->users_count, 1);
617 INIT_LIST_HEAD(&kvm->devices);
618
619 r = kvm_arch_init_vm(kvm, type);
620 if (r)
621 goto out_err_no_disable;
622
623 r = hardware_enable_all();
624 if (r)
625 goto out_err_no_disable;
626
627#ifdef CONFIG_HAVE_KVM_IRQFD
628 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
629#endif
630
631 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
632
633 r = -ENOMEM;
634 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
635 struct kvm_memslots *slots = kvm_alloc_memslots();
636 if (!slots)
637 goto out_err_no_srcu;
638
639
640
641
642
643 slots->generation = i * 2 - 150;
644 rcu_assign_pointer(kvm->memslots[i], slots);
645 }
646
647 if (init_srcu_struct(&kvm->srcu))
648 goto out_err_no_srcu;
649 if (init_srcu_struct(&kvm->irq_srcu))
650 goto out_err_no_irq_srcu;
651 for (i = 0; i < KVM_NR_BUSES; i++) {
652 rcu_assign_pointer(kvm->buses[i],
653 kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL));
654 if (!kvm->buses[i])
655 goto out_err;
656 }
657
658 r = kvm_init_mmu_notifier(kvm);
659 if (r)
660 goto out_err;
661
662 spin_lock(&kvm_lock);
663 list_add(&kvm->vm_list, &vm_list);
664 spin_unlock(&kvm_lock);
665
666 preempt_notifier_inc();
667
668 return kvm;
669
670out_err:
671 cleanup_srcu_struct(&kvm->irq_srcu);
672out_err_no_irq_srcu:
673 cleanup_srcu_struct(&kvm->srcu);
674out_err_no_srcu:
675 hardware_disable_all();
676out_err_no_disable:
677 for (i = 0; i < KVM_NR_BUSES; i++)
678 kfree(kvm_get_bus(kvm, i));
679 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
680 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
681 kvm_arch_free_vm(kvm);
682 mmdrop(current->mm);
683 return ERR_PTR(r);
684}
685
686static void kvm_destroy_devices(struct kvm *kvm)
687{
688 struct kvm_device *dev, *tmp;
689
690
691
692
693
694
695 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
696 list_del(&dev->vm_node);
697 dev->ops->destroy(dev);
698 }
699}
700
701static void kvm_destroy_vm(struct kvm *kvm)
702{
703 int i;
704 struct mm_struct *mm = kvm->mm;
705
706 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
707 kvm_destroy_vm_debugfs(kvm);
708 kvm_arch_sync_events(kvm);
709 spin_lock(&kvm_lock);
710 list_del(&kvm->vm_list);
711 spin_unlock(&kvm_lock);
712 kvm_free_irq_routing(kvm);
713 for (i = 0; i < KVM_NR_BUSES; i++) {
714 struct kvm_io_bus *bus = kvm_get_bus(kvm, i);
715
716 if (bus)
717 kvm_io_bus_destroy(bus);
718 kvm->buses[i] = NULL;
719 }
720 kvm_coalesced_mmio_free(kvm);
721#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
722 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
723#else
724 kvm_arch_flush_shadow_all(kvm);
725#endif
726 kvm_arch_destroy_vm(kvm);
727 kvm_destroy_devices(kvm);
728 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
729 kvm_free_memslots(kvm, __kvm_memslots(kvm, i));
730 cleanup_srcu_struct(&kvm->irq_srcu);
731 cleanup_srcu_struct(&kvm->srcu);
732 kvm_arch_free_vm(kvm);
733 preempt_notifier_dec();
734 hardware_disable_all();
735 mmdrop(mm);
736}
737
738void kvm_get_kvm(struct kvm *kvm)
739{
740 refcount_inc(&kvm->users_count);
741}
742EXPORT_SYMBOL_GPL(kvm_get_kvm);
743
744void kvm_put_kvm(struct kvm *kvm)
745{
746 if (refcount_dec_and_test(&kvm->users_count))
747 kvm_destroy_vm(kvm);
748}
749EXPORT_SYMBOL_GPL(kvm_put_kvm);
750
751
752static int kvm_vm_release(struct inode *inode, struct file *filp)
753{
754 struct kvm *kvm = filp->private_data;
755
756 kvm_irqfd_release(kvm);
757
758 kvm_put_kvm(kvm);
759 return 0;
760}
761
762
763
764
765
766static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
767{
768 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
769
770 memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL);
771 if (!memslot->dirty_bitmap)
772 return -ENOMEM;
773
774 return 0;
775}
776
777
778
779
780
781
782
783static void update_memslots(struct kvm_memslots *slots,
784 struct kvm_memory_slot *new)
785{
786 int id = new->id;
787 int i = slots->id_to_index[id];
788 struct kvm_memory_slot *mslots = slots->memslots;
789
790 WARN_ON(mslots[i].id != id);
791 if (!new->npages) {
792 WARN_ON(!mslots[i].npages);
793 if (mslots[i].npages)
794 slots->used_slots--;
795 } else {
796 if (!mslots[i].npages)
797 slots->used_slots++;
798 }
799
800 while (i < KVM_MEM_SLOTS_NUM - 1 &&
801 new->base_gfn <= mslots[i + 1].base_gfn) {
802 if (!mslots[i + 1].npages)
803 break;
804 mslots[i] = mslots[i + 1];
805 slots->id_to_index[mslots[i].id] = i;
806 i++;
807 }
808
809
810
811
812
813
814
815
816
817
818 if (new->npages) {
819 while (i > 0 &&
820 new->base_gfn >= mslots[i - 1].base_gfn) {
821 mslots[i] = mslots[i - 1];
822 slots->id_to_index[mslots[i].id] = i;
823 i--;
824 }
825 } else
826 WARN_ON_ONCE(i != slots->used_slots);
827
828 mslots[i] = *new;
829 slots->id_to_index[mslots[i].id] = i;
830}
831
832static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
833{
834 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
835
836#ifdef __KVM_HAVE_READONLY_MEM
837 valid_flags |= KVM_MEM_READONLY;
838#endif
839
840 if (mem->flags & ~valid_flags)
841 return -EINVAL;
842
843 return 0;
844}
845
846static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
847 int as_id, struct kvm_memslots *slots)
848{
849 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
850
851
852
853
854
855 WARN_ON(old_memslots->generation & 1);
856 slots->generation = old_memslots->generation + 1;
857
858 rcu_assign_pointer(kvm->memslots[as_id], slots);
859 synchronize_srcu_expedited(&kvm->srcu);
860
861
862
863
864
865
866
867
868
869
870
871
872 slots->generation += KVM_ADDRESS_SPACE_NUM * 2 - 1;
873
874 kvm_arch_memslots_updated(kvm, slots);
875
876 return old_memslots;
877}
878
879
880
881
882
883
884
885
886
887int __kvm_set_memory_region(struct kvm *kvm,
888 const struct kvm_userspace_memory_region *mem)
889{
890 int r;
891 gfn_t base_gfn;
892 unsigned long npages;
893 struct kvm_memory_slot *slot;
894 struct kvm_memory_slot old, new;
895 struct kvm_memslots *slots = NULL, *old_memslots;
896 int as_id, id;
897 enum kvm_mr_change change;
898
899 r = check_memory_region_flags(mem);
900 if (r)
901 goto out;
902
903 r = -EINVAL;
904 as_id = mem->slot >> 16;
905 id = (u16)mem->slot;
906
907
908 if (mem->memory_size & (PAGE_SIZE - 1))
909 goto out;
910 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
911 goto out;
912
913 if ((id < KVM_USER_MEM_SLOTS) &&
914 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
915 !access_ok(VERIFY_WRITE,
916 (void __user *)(unsigned long)mem->userspace_addr,
917 mem->memory_size)))
918 goto out;
919 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
920 goto out;
921 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
922 goto out;
923
924 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
925 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
926 npages = mem->memory_size >> PAGE_SHIFT;
927
928 if (npages > KVM_MEM_MAX_NR_PAGES)
929 goto out;
930
931 new = old = *slot;
932
933 new.id = id;
934 new.base_gfn = base_gfn;
935 new.npages = npages;
936 new.flags = mem->flags;
937
938 if (npages) {
939 if (!old.npages)
940 change = KVM_MR_CREATE;
941 else {
942 if ((mem->userspace_addr != old.userspace_addr) ||
943 (npages != old.npages) ||
944 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
945 goto out;
946
947 if (base_gfn != old.base_gfn)
948 change = KVM_MR_MOVE;
949 else if (new.flags != old.flags)
950 change = KVM_MR_FLAGS_ONLY;
951 else {
952 r = 0;
953 goto out;
954 }
955 }
956 } else {
957 if (!old.npages)
958 goto out;
959
960 change = KVM_MR_DELETE;
961 new.base_gfn = 0;
962 new.flags = 0;
963 }
964
965 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
966
967 r = -EEXIST;
968 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
969 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
970 (slot->id == id))
971 continue;
972 if (!((base_gfn + npages <= slot->base_gfn) ||
973 (base_gfn >= slot->base_gfn + slot->npages)))
974 goto out;
975 }
976 }
977
978
979 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
980 new.dirty_bitmap = NULL;
981
982 r = -ENOMEM;
983 if (change == KVM_MR_CREATE) {
984 new.userspace_addr = mem->userspace_addr;
985
986 if (kvm_arch_create_memslot(kvm, &new, npages))
987 goto out_free;
988 }
989
990
991 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
992 if (kvm_create_dirty_bitmap(&new) < 0)
993 goto out_free;
994 }
995
996 slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
997 if (!slots)
998 goto out_free;
999 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
1000
1001 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1002 slot = id_to_memslot(slots, id);
1003 slot->flags |= KVM_MEMSLOT_INVALID;
1004
1005 old_memslots = install_new_memslots(kvm, as_id, slots);
1006
1007
1008
1009
1010
1011
1012
1013
1014 kvm_arch_flush_shadow_memslot(kvm, slot);
1015
1016
1017
1018
1019
1020
1021 slots = old_memslots;
1022 }
1023
1024 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1025 if (r)
1026 goto out_slots;
1027
1028
1029 if (change == KVM_MR_DELETE) {
1030 new.dirty_bitmap = NULL;
1031 memset(&new.arch, 0, sizeof(new.arch));
1032 }
1033
1034 update_memslots(slots, &new);
1035 old_memslots = install_new_memslots(kvm, as_id, slots);
1036
1037 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1038
1039 kvm_free_memslot(kvm, &old, &new);
1040 kvfree(old_memslots);
1041 return 0;
1042
1043out_slots:
1044 kvfree(slots);
1045out_free:
1046 kvm_free_memslot(kvm, &new, &old);
1047out:
1048 return r;
1049}
1050EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1051
1052int kvm_set_memory_region(struct kvm *kvm,
1053 const struct kvm_userspace_memory_region *mem)
1054{
1055 int r;
1056
1057 mutex_lock(&kvm->slots_lock);
1058 r = __kvm_set_memory_region(kvm, mem);
1059 mutex_unlock(&kvm->slots_lock);
1060 return r;
1061}
1062EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1063
1064static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1065 struct kvm_userspace_memory_region *mem)
1066{
1067 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1068 return -EINVAL;
1069
1070 return kvm_set_memory_region(kvm, mem);
1071}
1072
1073int kvm_get_dirty_log(struct kvm *kvm,
1074 struct kvm_dirty_log *log, int *is_dirty)
1075{
1076 struct kvm_memslots *slots;
1077 struct kvm_memory_slot *memslot;
1078 int i, as_id, id;
1079 unsigned long n;
1080 unsigned long any = 0;
1081
1082 as_id = log->slot >> 16;
1083 id = (u16)log->slot;
1084 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1085 return -EINVAL;
1086
1087 slots = __kvm_memslots(kvm, as_id);
1088 memslot = id_to_memslot(slots, id);
1089 if (!memslot->dirty_bitmap)
1090 return -ENOENT;
1091
1092 n = kvm_dirty_bitmap_bytes(memslot);
1093
1094 for (i = 0; !any && i < n/sizeof(long); ++i)
1095 any = memslot->dirty_bitmap[i];
1096
1097 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1098 return -EFAULT;
1099
1100 if (any)
1101 *is_dirty = 1;
1102 return 0;
1103}
1104EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1105
1106#ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129int kvm_get_dirty_log_protect(struct kvm *kvm,
1130 struct kvm_dirty_log *log, bool *is_dirty)
1131{
1132 struct kvm_memslots *slots;
1133 struct kvm_memory_slot *memslot;
1134 int i, as_id, id;
1135 unsigned long n;
1136 unsigned long *dirty_bitmap;
1137 unsigned long *dirty_bitmap_buffer;
1138
1139 as_id = log->slot >> 16;
1140 id = (u16)log->slot;
1141 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1142 return -EINVAL;
1143
1144 slots = __kvm_memslots(kvm, as_id);
1145 memslot = id_to_memslot(slots, id);
1146
1147 dirty_bitmap = memslot->dirty_bitmap;
1148 if (!dirty_bitmap)
1149 return -ENOENT;
1150
1151 n = kvm_dirty_bitmap_bytes(memslot);
1152
1153 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1154 memset(dirty_bitmap_buffer, 0, n);
1155
1156 spin_lock(&kvm->mmu_lock);
1157 *is_dirty = false;
1158 for (i = 0; i < n / sizeof(long); i++) {
1159 unsigned long mask;
1160 gfn_t offset;
1161
1162 if (!dirty_bitmap[i])
1163 continue;
1164
1165 *is_dirty = true;
1166
1167 mask = xchg(&dirty_bitmap[i], 0);
1168 dirty_bitmap_buffer[i] = mask;
1169
1170 if (mask) {
1171 offset = i * BITS_PER_LONG;
1172 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1173 offset, mask);
1174 }
1175 }
1176
1177 spin_unlock(&kvm->mmu_lock);
1178 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1179 return -EFAULT;
1180 return 0;
1181}
1182EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1183#endif
1184
1185bool kvm_largepages_enabled(void)
1186{
1187 return largepages_enabled;
1188}
1189
1190void kvm_disable_largepages(void)
1191{
1192 largepages_enabled = false;
1193}
1194EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1195
1196struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1197{
1198 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1199}
1200EXPORT_SYMBOL_GPL(gfn_to_memslot);
1201
1202struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1203{
1204 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1205}
1206
1207bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1208{
1209 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1210
1211 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1212 memslot->flags & KVM_MEMSLOT_INVALID)
1213 return false;
1214
1215 return true;
1216}
1217EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1218
1219unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1220{
1221 struct vm_area_struct *vma;
1222 unsigned long addr, size;
1223
1224 size = PAGE_SIZE;
1225
1226 addr = gfn_to_hva(kvm, gfn);
1227 if (kvm_is_error_hva(addr))
1228 return PAGE_SIZE;
1229
1230 down_read(¤t->mm->mmap_sem);
1231 vma = find_vma(current->mm, addr);
1232 if (!vma)
1233 goto out;
1234
1235 size = vma_kernel_pagesize(vma);
1236
1237out:
1238 up_read(¤t->mm->mmap_sem);
1239
1240 return size;
1241}
1242
1243static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1244{
1245 return slot->flags & KVM_MEM_READONLY;
1246}
1247
1248static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1249 gfn_t *nr_pages, bool write)
1250{
1251 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1252 return KVM_HVA_ERR_BAD;
1253
1254 if (memslot_is_readonly(slot) && write)
1255 return KVM_HVA_ERR_RO_BAD;
1256
1257 if (nr_pages)
1258 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1259
1260 return __gfn_to_hva_memslot(slot, gfn);
1261}
1262
1263static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1264 gfn_t *nr_pages)
1265{
1266 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1267}
1268
1269unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1270 gfn_t gfn)
1271{
1272 return gfn_to_hva_many(slot, gfn, NULL);
1273}
1274EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1275
1276unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1277{
1278 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1279}
1280EXPORT_SYMBOL_GPL(gfn_to_hva);
1281
1282unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1283{
1284 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1285}
1286EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1287
1288
1289
1290
1291
1292unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1293 gfn_t gfn, bool *writable)
1294{
1295 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1296
1297 if (!kvm_is_error_hva(hva) && writable)
1298 *writable = !memslot_is_readonly(slot);
1299
1300 return hva;
1301}
1302
1303unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1304{
1305 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1306
1307 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1308}
1309
1310unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1311{
1312 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1313
1314 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1315}
1316
1317static int get_user_page_nowait(unsigned long start, int write,
1318 struct page **page)
1319{
1320 int flags = FOLL_NOWAIT | FOLL_HWPOISON;
1321
1322 if (write)
1323 flags |= FOLL_WRITE;
1324
1325 return get_user_pages(start, 1, flags, page, NULL);
1326}
1327
1328static inline int check_user_page_hwpoison(unsigned long addr)
1329{
1330 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1331
1332 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1333 return rc == -EHWPOISON;
1334}
1335
1336
1337
1338
1339
1340static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1341 bool write_fault, bool *writable, kvm_pfn_t *pfn)
1342{
1343 struct page *page[1];
1344 int npages;
1345
1346 if (!(async || atomic))
1347 return false;
1348
1349
1350
1351
1352
1353
1354 if (!(write_fault || writable))
1355 return false;
1356
1357 npages = __get_user_pages_fast(addr, 1, 1, page);
1358 if (npages == 1) {
1359 *pfn = page_to_pfn(page[0]);
1360
1361 if (writable)
1362 *writable = true;
1363 return true;
1364 }
1365
1366 return false;
1367}
1368
1369
1370
1371
1372
1373static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1374 bool *writable, kvm_pfn_t *pfn)
1375{
1376 struct page *page[1];
1377 int npages = 0;
1378
1379 might_sleep();
1380
1381 if (writable)
1382 *writable = write_fault;
1383
1384 if (async) {
1385 down_read(¤t->mm->mmap_sem);
1386 npages = get_user_page_nowait(addr, write_fault, page);
1387 up_read(¤t->mm->mmap_sem);
1388 } else {
1389 unsigned int flags = FOLL_HWPOISON;
1390
1391 if (write_fault)
1392 flags |= FOLL_WRITE;
1393
1394 npages = get_user_pages_unlocked(addr, 1, page, flags);
1395 }
1396 if (npages != 1)
1397 return npages;
1398
1399
1400 if (unlikely(!write_fault) && writable) {
1401 struct page *wpage[1];
1402
1403 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1404 if (npages == 1) {
1405 *writable = true;
1406 put_page(page[0]);
1407 page[0] = wpage[0];
1408 }
1409
1410 npages = 1;
1411 }
1412 *pfn = page_to_pfn(page[0]);
1413 return npages;
1414}
1415
1416static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1417{
1418 if (unlikely(!(vma->vm_flags & VM_READ)))
1419 return false;
1420
1421 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1422 return false;
1423
1424 return true;
1425}
1426
1427static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1428 unsigned long addr, bool *async,
1429 bool write_fault, kvm_pfn_t *p_pfn)
1430{
1431 unsigned long pfn;
1432 int r;
1433
1434 r = follow_pfn(vma, addr, &pfn);
1435 if (r) {
1436
1437
1438
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;
1448
1449 r = follow_pfn(vma, addr, &pfn);
1450 if (r)
1451 return r;
1452
1453 }
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467 kvm_get_pfn(pfn);
1468
1469 *p_pfn = pfn;
1470 return 0;
1471}
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1488 bool write_fault, bool *writable)
1489{
1490 struct vm_area_struct *vma;
1491 kvm_pfn_t pfn = 0;
1492 int npages, r;
1493
1494
1495 BUG_ON(atomic && async);
1496
1497 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1498 return pfn;
1499
1500 if (atomic)
1501 return KVM_PFN_ERR_FAULT;
1502
1503 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1504 if (npages == 1)
1505 return pfn;
1506
1507 down_read(¤t->mm->mmap_sem);
1508 if (npages == -EHWPOISON ||
1509 (!async && check_user_page_hwpoison(addr))) {
1510 pfn = KVM_PFN_ERR_HWPOISON;
1511 goto exit;
1512 }
1513
1514retry:
1515 vma = find_vma_intersection(current->mm, addr, addr + 1);
1516
1517 if (vma == NULL)
1518 pfn = KVM_PFN_ERR_FAULT;
1519 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1520 r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn);
1521 if (r == -EAGAIN)
1522 goto retry;
1523 if (r < 0)
1524 pfn = KVM_PFN_ERR_FAULT;
1525 } else {
1526 if (async && vma_is_valid(vma, write_fault))
1527 *async = true;
1528 pfn = KVM_PFN_ERR_FAULT;
1529 }
1530exit:
1531 up_read(¤t->mm->mmap_sem);
1532 return pfn;
1533}
1534
1535kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1536 bool atomic, bool *async, bool write_fault,
1537 bool *writable)
1538{
1539 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1540
1541 if (addr == KVM_HVA_ERR_RO_BAD) {
1542 if (writable)
1543 *writable = false;
1544 return KVM_PFN_ERR_RO_FAULT;
1545 }
1546
1547 if (kvm_is_error_hva(addr)) {
1548 if (writable)
1549 *writable = false;
1550 return KVM_PFN_NOSLOT;
1551 }
1552
1553
1554 if (writable && memslot_is_readonly(slot)) {
1555 *writable = false;
1556 writable = NULL;
1557 }
1558
1559 return hva_to_pfn(addr, atomic, async, write_fault,
1560 writable);
1561}
1562EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1563
1564kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1565 bool *writable)
1566{
1567 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1568 write_fault, writable);
1569}
1570EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1571
1572kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1573{
1574 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1575}
1576EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1577
1578kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1579{
1580 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1581}
1582EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1583
1584kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1585{
1586 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1587}
1588EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1589
1590kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1591{
1592 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1593}
1594EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1595
1596kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1597{
1598 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1599}
1600EXPORT_SYMBOL_GPL(gfn_to_pfn);
1601
1602kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1603{
1604 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1605}
1606EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1607
1608int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1609 struct page **pages, int nr_pages)
1610{
1611 unsigned long addr;
1612 gfn_t entry;
1613
1614 addr = gfn_to_hva_many(slot, gfn, &entry);
1615 if (kvm_is_error_hva(addr))
1616 return -1;
1617
1618 if (entry < nr_pages)
1619 return 0;
1620
1621 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1622}
1623EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1624
1625static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1626{
1627 if (is_error_noslot_pfn(pfn))
1628 return KVM_ERR_PTR_BAD_PAGE;
1629
1630 if (kvm_is_reserved_pfn(pfn)) {
1631 WARN_ON(1);
1632 return KVM_ERR_PTR_BAD_PAGE;
1633 }
1634
1635 return pfn_to_page(pfn);
1636}
1637
1638struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1639{
1640 kvm_pfn_t pfn;
1641
1642 pfn = gfn_to_pfn(kvm, gfn);
1643
1644 return kvm_pfn_to_page(pfn);
1645}
1646EXPORT_SYMBOL_GPL(gfn_to_page);
1647
1648struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1649{
1650 kvm_pfn_t pfn;
1651
1652 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1653
1654 return kvm_pfn_to_page(pfn);
1655}
1656EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1657
1658void kvm_release_page_clean(struct page *page)
1659{
1660 WARN_ON(is_error_page(page));
1661
1662 kvm_release_pfn_clean(page_to_pfn(page));
1663}
1664EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1665
1666void kvm_release_pfn_clean(kvm_pfn_t pfn)
1667{
1668 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1669 put_page(pfn_to_page(pfn));
1670}
1671EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1672
1673void kvm_release_page_dirty(struct page *page)
1674{
1675 WARN_ON(is_error_page(page));
1676
1677 kvm_release_pfn_dirty(page_to_pfn(page));
1678}
1679EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1680
1681static void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1682{
1683 kvm_set_pfn_dirty(pfn);
1684 kvm_release_pfn_clean(pfn);
1685}
1686
1687void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1688{
1689 if (!kvm_is_reserved_pfn(pfn)) {
1690 struct page *page = pfn_to_page(pfn);
1691
1692 if (!PageReserved(page))
1693 SetPageDirty(page);
1694 }
1695}
1696EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1697
1698void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1699{
1700 if (!kvm_is_reserved_pfn(pfn))
1701 mark_page_accessed(pfn_to_page(pfn));
1702}
1703EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1704
1705void kvm_get_pfn(kvm_pfn_t pfn)
1706{
1707 if (!kvm_is_reserved_pfn(pfn))
1708 get_page(pfn_to_page(pfn));
1709}
1710EXPORT_SYMBOL_GPL(kvm_get_pfn);
1711
1712static int next_segment(unsigned long len, int offset)
1713{
1714 if (len > PAGE_SIZE - offset)
1715 return PAGE_SIZE - offset;
1716 else
1717 return len;
1718}
1719
1720static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1721 void *data, int offset, int len)
1722{
1723 int r;
1724 unsigned long addr;
1725
1726 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1727 if (kvm_is_error_hva(addr))
1728 return -EFAULT;
1729 r = __copy_from_user(data, (void __user *)addr + offset, len);
1730 if (r)
1731 return -EFAULT;
1732 return 0;
1733}
1734
1735int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1736 int len)
1737{
1738 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1739
1740 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1741}
1742EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1743
1744int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1745 int offset, int len)
1746{
1747 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1748
1749 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1750}
1751EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1752
1753int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1754{
1755 gfn_t gfn = gpa >> PAGE_SHIFT;
1756 int seg;
1757 int offset = offset_in_page(gpa);
1758 int ret;
1759
1760 while ((seg = next_segment(len, offset)) != 0) {
1761 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1762 if (ret < 0)
1763 return ret;
1764 offset = 0;
1765 len -= seg;
1766 data += seg;
1767 ++gfn;
1768 }
1769 return 0;
1770}
1771EXPORT_SYMBOL_GPL(kvm_read_guest);
1772
1773int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1774{
1775 gfn_t gfn = gpa >> PAGE_SHIFT;
1776 int seg;
1777 int offset = offset_in_page(gpa);
1778 int ret;
1779
1780 while ((seg = next_segment(len, offset)) != 0) {
1781 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1782 if (ret < 0)
1783 return ret;
1784 offset = 0;
1785 len -= seg;
1786 data += seg;
1787 ++gfn;
1788 }
1789 return 0;
1790}
1791EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1792
1793static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1794 void *data, int offset, unsigned long len)
1795{
1796 int r;
1797 unsigned long addr;
1798
1799 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1800 if (kvm_is_error_hva(addr))
1801 return -EFAULT;
1802 pagefault_disable();
1803 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1804 pagefault_enable();
1805 if (r)
1806 return -EFAULT;
1807 return 0;
1808}
1809
1810int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1811 unsigned long len)
1812{
1813 gfn_t gfn = gpa >> PAGE_SHIFT;
1814 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1815 int offset = offset_in_page(gpa);
1816
1817 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1818}
1819EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1820
1821int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1822 void *data, unsigned long len)
1823{
1824 gfn_t gfn = gpa >> PAGE_SHIFT;
1825 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1826 int offset = offset_in_page(gpa);
1827
1828 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1829}
1830EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1831
1832static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1833 const void *data, int offset, int len)
1834{
1835 int r;
1836 unsigned long addr;
1837
1838 addr = gfn_to_hva_memslot(memslot, gfn);
1839 if (kvm_is_error_hva(addr))
1840 return -EFAULT;
1841 r = __copy_to_user((void __user *)addr + offset, data, len);
1842 if (r)
1843 return -EFAULT;
1844 mark_page_dirty_in_slot(memslot, gfn);
1845 return 0;
1846}
1847
1848int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1849 const void *data, int offset, int len)
1850{
1851 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1852
1853 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1854}
1855EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1856
1857int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1858 const void *data, int offset, int len)
1859{
1860 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1861
1862 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1863}
1864EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1865
1866int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1867 unsigned long len)
1868{
1869 gfn_t gfn = gpa >> PAGE_SHIFT;
1870 int seg;
1871 int offset = offset_in_page(gpa);
1872 int ret;
1873
1874 while ((seg = next_segment(len, offset)) != 0) {
1875 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1876 if (ret < 0)
1877 return ret;
1878 offset = 0;
1879 len -= seg;
1880 data += seg;
1881 ++gfn;
1882 }
1883 return 0;
1884}
1885EXPORT_SYMBOL_GPL(kvm_write_guest);
1886
1887int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1888 unsigned long len)
1889{
1890 gfn_t gfn = gpa >> PAGE_SHIFT;
1891 int seg;
1892 int offset = offset_in_page(gpa);
1893 int ret;
1894
1895 while ((seg = next_segment(len, offset)) != 0) {
1896 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1897 if (ret < 0)
1898 return ret;
1899 offset = 0;
1900 len -= seg;
1901 data += seg;
1902 ++gfn;
1903 }
1904 return 0;
1905}
1906EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1907
1908static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
1909 struct gfn_to_hva_cache *ghc,
1910 gpa_t gpa, unsigned long len)
1911{
1912 int offset = offset_in_page(gpa);
1913 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1914 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1915 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1916 gfn_t nr_pages_avail;
1917
1918 ghc->gpa = gpa;
1919 ghc->generation = slots->generation;
1920 ghc->len = len;
1921 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1922 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1923 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1924 ghc->hva += offset;
1925 } else {
1926
1927
1928
1929
1930 while (start_gfn <= end_gfn) {
1931 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1932 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1933 &nr_pages_avail);
1934 if (kvm_is_error_hva(ghc->hva))
1935 return -EFAULT;
1936 start_gfn += nr_pages_avail;
1937 }
1938
1939 ghc->memslot = NULL;
1940 }
1941 return 0;
1942}
1943
1944int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1945 gpa_t gpa, unsigned long len)
1946{
1947 struct kvm_memslots *slots = kvm_memslots(kvm);
1948 return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len);
1949}
1950EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1951
1952int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1953 void *data, int offset, unsigned long len)
1954{
1955 struct kvm_memslots *slots = kvm_memslots(kvm);
1956 int r;
1957 gpa_t gpa = ghc->gpa + offset;
1958
1959 BUG_ON(len + offset > ghc->len);
1960
1961 if (slots->generation != ghc->generation)
1962 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
1963
1964 if (unlikely(!ghc->memslot))
1965 return kvm_write_guest(kvm, gpa, data, len);
1966
1967 if (kvm_is_error_hva(ghc->hva))
1968 return -EFAULT;
1969
1970 r = __copy_to_user((void __user *)ghc->hva + offset, data, len);
1971 if (r)
1972 return -EFAULT;
1973 mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT);
1974
1975 return 0;
1976}
1977EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached);
1978
1979int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1980 void *data, unsigned long len)
1981{
1982 return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len);
1983}
1984EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1985
1986int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1987 void *data, unsigned long len)
1988{
1989 struct kvm_memslots *slots = kvm_memslots(kvm);
1990 int r;
1991
1992 BUG_ON(len > ghc->len);
1993
1994 if (slots->generation != ghc->generation)
1995 __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len);
1996
1997 if (unlikely(!ghc->memslot))
1998 return kvm_read_guest(kvm, ghc->gpa, data, len);
1999
2000 if (kvm_is_error_hva(ghc->hva))
2001 return -EFAULT;
2002
2003 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2004 if (r)
2005 return -EFAULT;
2006
2007 return 0;
2008}
2009EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2010
2011int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2012{
2013 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2014
2015 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2016}
2017EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2018
2019int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2020{
2021 gfn_t gfn = gpa >> PAGE_SHIFT;
2022 int seg;
2023 int offset = offset_in_page(gpa);
2024 int ret;
2025
2026 while ((seg = next_segment(len, offset)) != 0) {
2027 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2028 if (ret < 0)
2029 return ret;
2030 offset = 0;
2031 len -= seg;
2032 ++gfn;
2033 }
2034 return 0;
2035}
2036EXPORT_SYMBOL_GPL(kvm_clear_guest);
2037
2038static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2039 gfn_t gfn)
2040{
2041 if (memslot && memslot->dirty_bitmap) {
2042 unsigned long rel_gfn = gfn - memslot->base_gfn;
2043
2044 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2045 }
2046}
2047
2048void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2049{
2050 struct kvm_memory_slot *memslot;
2051
2052 memslot = gfn_to_memslot(kvm, gfn);
2053 mark_page_dirty_in_slot(memslot, gfn);
2054}
2055EXPORT_SYMBOL_GPL(mark_page_dirty);
2056
2057void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2058{
2059 struct kvm_memory_slot *memslot;
2060
2061 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2062 mark_page_dirty_in_slot(memslot, gfn);
2063}
2064EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2065
2066static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2067{
2068 unsigned int old, val, grow;
2069
2070 old = val = vcpu->halt_poll_ns;
2071 grow = READ_ONCE(halt_poll_ns_grow);
2072
2073 if (val == 0 && grow)
2074 val = 10000;
2075 else
2076 val *= grow;
2077
2078 if (val > halt_poll_ns)
2079 val = halt_poll_ns;
2080
2081 vcpu->halt_poll_ns = val;
2082 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2083}
2084
2085static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2086{
2087 unsigned int old, val, shrink;
2088
2089 old = val = vcpu->halt_poll_ns;
2090 shrink = READ_ONCE(halt_poll_ns_shrink);
2091 if (shrink == 0)
2092 val = 0;
2093 else
2094 val /= shrink;
2095
2096 vcpu->halt_poll_ns = val;
2097 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2098}
2099
2100static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2101{
2102 if (kvm_arch_vcpu_runnable(vcpu)) {
2103 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2104 return -EINTR;
2105 }
2106 if (kvm_cpu_has_pending_timer(vcpu))
2107 return -EINTR;
2108 if (signal_pending(current))
2109 return -EINTR;
2110
2111 return 0;
2112}
2113
2114
2115
2116
2117void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2118{
2119 ktime_t start, cur;
2120 DECLARE_SWAITQUEUE(wait);
2121 bool waited = false;
2122 u64 block_ns;
2123
2124 start = cur = ktime_get();
2125 if (vcpu->halt_poll_ns) {
2126 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2127
2128 ++vcpu->stat.halt_attempted_poll;
2129 do {
2130
2131
2132
2133
2134 if (kvm_vcpu_check_block(vcpu) < 0) {
2135 ++vcpu->stat.halt_successful_poll;
2136 if (!vcpu_valid_wakeup(vcpu))
2137 ++vcpu->stat.halt_poll_invalid;
2138 goto out;
2139 }
2140 cur = ktime_get();
2141 } while (single_task_running() && ktime_before(cur, stop));
2142 }
2143
2144 kvm_arch_vcpu_blocking(vcpu);
2145
2146 for (;;) {
2147 prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2148
2149 if (kvm_vcpu_check_block(vcpu) < 0)
2150 break;
2151
2152 waited = true;
2153 schedule();
2154 }
2155
2156 finish_swait(&vcpu->wq, &wait);
2157 cur = ktime_get();
2158
2159 kvm_arch_vcpu_unblocking(vcpu);
2160out:
2161 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2162
2163 if (!vcpu_valid_wakeup(vcpu))
2164 shrink_halt_poll_ns(vcpu);
2165 else if (halt_poll_ns) {
2166 if (block_ns <= vcpu->halt_poll_ns)
2167 ;
2168
2169 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2170 shrink_halt_poll_ns(vcpu);
2171
2172 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2173 block_ns < halt_poll_ns)
2174 grow_halt_poll_ns(vcpu);
2175 } else
2176 vcpu->halt_poll_ns = 0;
2177
2178 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2179 kvm_arch_vcpu_block_finish(vcpu);
2180}
2181EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2182
2183bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2184{
2185 struct swait_queue_head *wqp;
2186
2187 wqp = kvm_arch_vcpu_wq(vcpu);
2188 if (swait_active(wqp)) {
2189 swake_up(wqp);
2190 ++vcpu->stat.halt_wakeup;
2191 return true;
2192 }
2193
2194 return false;
2195}
2196EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2197
2198#ifndef CONFIG_S390
2199
2200
2201
2202void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2203{
2204 int me;
2205 int cpu = vcpu->cpu;
2206
2207 if (kvm_vcpu_wake_up(vcpu))
2208 return;
2209
2210 me = get_cpu();
2211 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2212 if (kvm_arch_vcpu_should_kick(vcpu))
2213 smp_send_reschedule(cpu);
2214 put_cpu();
2215}
2216EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2217#endif
2218
2219int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2220{
2221 struct pid *pid;
2222 struct task_struct *task = NULL;
2223 int ret = 0;
2224
2225 rcu_read_lock();
2226 pid = rcu_dereference(target->pid);
2227 if (pid)
2228 task = get_pid_task(pid, PIDTYPE_PID);
2229 rcu_read_unlock();
2230 if (!task)
2231 return ret;
2232 ret = yield_to(task, 1);
2233 put_task_struct(task);
2234
2235 return ret;
2236}
2237EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2262{
2263#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2264 bool eligible;
2265
2266 eligible = !vcpu->spin_loop.in_spin_loop ||
2267 vcpu->spin_loop.dy_eligible;
2268
2269 if (vcpu->spin_loop.in_spin_loop)
2270 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2271
2272 return eligible;
2273#else
2274 return true;
2275#endif
2276}
2277
2278void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2279{
2280 struct kvm *kvm = me->kvm;
2281 struct kvm_vcpu *vcpu;
2282 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2283 int yielded = 0;
2284 int try = 3;
2285 int pass;
2286 int i;
2287
2288 kvm_vcpu_set_in_spin_loop(me, true);
2289
2290
2291
2292
2293
2294
2295
2296 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2297 kvm_for_each_vcpu(i, vcpu, kvm) {
2298 if (!pass && i <= last_boosted_vcpu) {
2299 i = last_boosted_vcpu;
2300 continue;
2301 } else if (pass && i > last_boosted_vcpu)
2302 break;
2303 if (!ACCESS_ONCE(vcpu->preempted))
2304 continue;
2305 if (vcpu == me)
2306 continue;
2307 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2308 continue;
2309 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2310 continue;
2311
2312 yielded = kvm_vcpu_yield_to(vcpu);
2313 if (yielded > 0) {
2314 kvm->last_boosted_vcpu = i;
2315 break;
2316 } else if (yielded < 0) {
2317 try--;
2318 if (!try)
2319 break;
2320 }
2321 }
2322 }
2323 kvm_vcpu_set_in_spin_loop(me, false);
2324
2325
2326 kvm_vcpu_set_dy_eligible(me, false);
2327}
2328EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2329
2330static int kvm_vcpu_fault(struct vm_fault *vmf)
2331{
2332 struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data;
2333 struct page *page;
2334
2335 if (vmf->pgoff == 0)
2336 page = virt_to_page(vcpu->run);
2337#ifdef CONFIG_X86
2338 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2339 page = virt_to_page(vcpu->arch.pio_data);
2340#endif
2341#ifdef CONFIG_KVM_MMIO
2342 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2343 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2344#endif
2345 else
2346 return kvm_arch_vcpu_fault(vcpu, vmf);
2347 get_page(page);
2348 vmf->page = page;
2349 return 0;
2350}
2351
2352static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2353 .fault = kvm_vcpu_fault,
2354};
2355
2356static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2357{
2358 vma->vm_ops = &kvm_vcpu_vm_ops;
2359 return 0;
2360}
2361
2362static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2363{
2364 struct kvm_vcpu *vcpu = filp->private_data;
2365
2366 debugfs_remove_recursive(vcpu->debugfs_dentry);
2367 kvm_put_kvm(vcpu->kvm);
2368 return 0;
2369}
2370
2371static struct file_operations kvm_vcpu_fops = {
2372 .release = kvm_vcpu_release,
2373 .unlocked_ioctl = kvm_vcpu_ioctl,
2374#ifdef CONFIG_KVM_COMPAT
2375 .compat_ioctl = kvm_vcpu_compat_ioctl,
2376#endif
2377 .mmap = kvm_vcpu_mmap,
2378 .llseek = noop_llseek,
2379};
2380
2381
2382
2383
2384static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2385{
2386 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2387}
2388
2389static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2390{
2391 char dir_name[ITOA_MAX_LEN * 2];
2392 int ret;
2393
2394 if (!kvm_arch_has_vcpu_debugfs())
2395 return 0;
2396
2397 if (!debugfs_initialized())
2398 return 0;
2399
2400 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2401 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2402 vcpu->kvm->debugfs_dentry);
2403 if (!vcpu->debugfs_dentry)
2404 return -ENOMEM;
2405
2406 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2407 if (ret < 0) {
2408 debugfs_remove_recursive(vcpu->debugfs_dentry);
2409 return ret;
2410 }
2411
2412 return 0;
2413}
2414
2415
2416
2417
2418static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2419{
2420 int r;
2421 struct kvm_vcpu *vcpu;
2422
2423 if (id >= KVM_MAX_VCPU_ID)
2424 return -EINVAL;
2425
2426 mutex_lock(&kvm->lock);
2427 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2428 mutex_unlock(&kvm->lock);
2429 return -EINVAL;
2430 }
2431
2432 kvm->created_vcpus++;
2433 mutex_unlock(&kvm->lock);
2434
2435 vcpu = kvm_arch_vcpu_create(kvm, id);
2436 if (IS_ERR(vcpu)) {
2437 r = PTR_ERR(vcpu);
2438 goto vcpu_decrement;
2439 }
2440
2441 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2442
2443 r = kvm_arch_vcpu_setup(vcpu);
2444 if (r)
2445 goto vcpu_destroy;
2446
2447 r = kvm_create_vcpu_debugfs(vcpu);
2448 if (r)
2449 goto vcpu_destroy;
2450
2451 mutex_lock(&kvm->lock);
2452 if (kvm_get_vcpu_by_id(kvm, id)) {
2453 r = -EEXIST;
2454 goto unlock_vcpu_destroy;
2455 }
2456
2457 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2458
2459
2460 kvm_get_kvm(kvm);
2461 r = create_vcpu_fd(vcpu);
2462 if (r < 0) {
2463 kvm_put_kvm(kvm);
2464 goto unlock_vcpu_destroy;
2465 }
2466
2467 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2468
2469
2470
2471
2472
2473 smp_wmb();
2474 atomic_inc(&kvm->online_vcpus);
2475
2476 mutex_unlock(&kvm->lock);
2477 kvm_arch_vcpu_postcreate(vcpu);
2478 return r;
2479
2480unlock_vcpu_destroy:
2481 mutex_unlock(&kvm->lock);
2482 debugfs_remove_recursive(vcpu->debugfs_dentry);
2483vcpu_destroy:
2484 kvm_arch_vcpu_destroy(vcpu);
2485vcpu_decrement:
2486 mutex_lock(&kvm->lock);
2487 kvm->created_vcpus--;
2488 mutex_unlock(&kvm->lock);
2489 return r;
2490}
2491
2492static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2493{
2494 if (sigset) {
2495 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2496 vcpu->sigset_active = 1;
2497 vcpu->sigset = *sigset;
2498 } else
2499 vcpu->sigset_active = 0;
2500 return 0;
2501}
2502
2503static long kvm_vcpu_ioctl(struct file *filp,
2504 unsigned int ioctl, unsigned long arg)
2505{
2506 struct kvm_vcpu *vcpu = filp->private_data;
2507 void __user *argp = (void __user *)arg;
2508 int r;
2509 struct kvm_fpu *fpu = NULL;
2510 struct kvm_sregs *kvm_sregs = NULL;
2511
2512 if (vcpu->kvm->mm != current->mm)
2513 return -EIO;
2514
2515 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2516 return -EINVAL;
2517
2518#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2519
2520
2521
2522
2523 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2524 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2525#endif
2526
2527
2528 r = vcpu_load(vcpu);
2529 if (r)
2530 return r;
2531 switch (ioctl) {
2532 case KVM_RUN: {
2533 struct pid *oldpid;
2534 r = -EINVAL;
2535 if (arg)
2536 goto out;
2537 oldpid = rcu_access_pointer(vcpu->pid);
2538 if (unlikely(oldpid != current->pids[PIDTYPE_PID].pid)) {
2539
2540 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2541
2542 rcu_assign_pointer(vcpu->pid, newpid);
2543 if (oldpid)
2544 synchronize_rcu();
2545 put_pid(oldpid);
2546 }
2547 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2548 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2549 break;
2550 }
2551 case KVM_GET_REGS: {
2552 struct kvm_regs *kvm_regs;
2553
2554 r = -ENOMEM;
2555 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2556 if (!kvm_regs)
2557 goto out;
2558 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2559 if (r)
2560 goto out_free1;
2561 r = -EFAULT;
2562 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2563 goto out_free1;
2564 r = 0;
2565out_free1:
2566 kfree(kvm_regs);
2567 break;
2568 }
2569 case KVM_SET_REGS: {
2570 struct kvm_regs *kvm_regs;
2571
2572 r = -ENOMEM;
2573 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2574 if (IS_ERR(kvm_regs)) {
2575 r = PTR_ERR(kvm_regs);
2576 goto out;
2577 }
2578 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2579 kfree(kvm_regs);
2580 break;
2581 }
2582 case KVM_GET_SREGS: {
2583 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2584 r = -ENOMEM;
2585 if (!kvm_sregs)
2586 goto out;
2587 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2588 if (r)
2589 goto out;
2590 r = -EFAULT;
2591 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2592 goto out;
2593 r = 0;
2594 break;
2595 }
2596 case KVM_SET_SREGS: {
2597 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2598 if (IS_ERR(kvm_sregs)) {
2599 r = PTR_ERR(kvm_sregs);
2600 kvm_sregs = NULL;
2601 goto out;
2602 }
2603 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2604 break;
2605 }
2606 case KVM_GET_MP_STATE: {
2607 struct kvm_mp_state mp_state;
2608
2609 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2610 if (r)
2611 goto out;
2612 r = -EFAULT;
2613 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2614 goto out;
2615 r = 0;
2616 break;
2617 }
2618 case KVM_SET_MP_STATE: {
2619 struct kvm_mp_state mp_state;
2620
2621 r = -EFAULT;
2622 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2623 goto out;
2624 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2625 break;
2626 }
2627 case KVM_TRANSLATE: {
2628 struct kvm_translation tr;
2629
2630 r = -EFAULT;
2631 if (copy_from_user(&tr, argp, sizeof(tr)))
2632 goto out;
2633 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2634 if (r)
2635 goto out;
2636 r = -EFAULT;
2637 if (copy_to_user(argp, &tr, sizeof(tr)))
2638 goto out;
2639 r = 0;
2640 break;
2641 }
2642 case KVM_SET_GUEST_DEBUG: {
2643 struct kvm_guest_debug dbg;
2644
2645 r = -EFAULT;
2646 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2647 goto out;
2648 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2649 break;
2650 }
2651 case KVM_SET_SIGNAL_MASK: {
2652 struct kvm_signal_mask __user *sigmask_arg = argp;
2653 struct kvm_signal_mask kvm_sigmask;
2654 sigset_t sigset, *p;
2655
2656 p = NULL;
2657 if (argp) {
2658 r = -EFAULT;
2659 if (copy_from_user(&kvm_sigmask, argp,
2660 sizeof(kvm_sigmask)))
2661 goto out;
2662 r = -EINVAL;
2663 if (kvm_sigmask.len != sizeof(sigset))
2664 goto out;
2665 r = -EFAULT;
2666 if (copy_from_user(&sigset, sigmask_arg->sigset,
2667 sizeof(sigset)))
2668 goto out;
2669 p = &sigset;
2670 }
2671 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2672 break;
2673 }
2674 case KVM_GET_FPU: {
2675 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2676 r = -ENOMEM;
2677 if (!fpu)
2678 goto out;
2679 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2680 if (r)
2681 goto out;
2682 r = -EFAULT;
2683 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2684 goto out;
2685 r = 0;
2686 break;
2687 }
2688 case KVM_SET_FPU: {
2689 fpu = memdup_user(argp, sizeof(*fpu));
2690 if (IS_ERR(fpu)) {
2691 r = PTR_ERR(fpu);
2692 fpu = NULL;
2693 goto out;
2694 }
2695 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2696 break;
2697 }
2698 default:
2699 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2700 }
2701out:
2702 vcpu_put(vcpu);
2703 kfree(fpu);
2704 kfree(kvm_sregs);
2705 return r;
2706}
2707
2708#ifdef CONFIG_KVM_COMPAT
2709static long kvm_vcpu_compat_ioctl(struct file *filp,
2710 unsigned int ioctl, unsigned long arg)
2711{
2712 struct kvm_vcpu *vcpu = filp->private_data;
2713 void __user *argp = compat_ptr(arg);
2714 int r;
2715
2716 if (vcpu->kvm->mm != current->mm)
2717 return -EIO;
2718
2719 switch (ioctl) {
2720 case KVM_SET_SIGNAL_MASK: {
2721 struct kvm_signal_mask __user *sigmask_arg = argp;
2722 struct kvm_signal_mask kvm_sigmask;
2723 compat_sigset_t csigset;
2724 sigset_t sigset;
2725
2726 if (argp) {
2727 r = -EFAULT;
2728 if (copy_from_user(&kvm_sigmask, argp,
2729 sizeof(kvm_sigmask)))
2730 goto out;
2731 r = -EINVAL;
2732 if (kvm_sigmask.len != sizeof(csigset))
2733 goto out;
2734 r = -EFAULT;
2735 if (copy_from_user(&csigset, sigmask_arg->sigset,
2736 sizeof(csigset)))
2737 goto out;
2738 sigset_from_compat(&sigset, &csigset);
2739 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2740 } else
2741 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2742 break;
2743 }
2744 default:
2745 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2746 }
2747
2748out:
2749 return r;
2750}
2751#endif
2752
2753static int kvm_device_ioctl_attr(struct kvm_device *dev,
2754 int (*accessor)(struct kvm_device *dev,
2755 struct kvm_device_attr *attr),
2756 unsigned long arg)
2757{
2758 struct kvm_device_attr attr;
2759
2760 if (!accessor)
2761 return -EPERM;
2762
2763 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2764 return -EFAULT;
2765
2766 return accessor(dev, &attr);
2767}
2768
2769static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2770 unsigned long arg)
2771{
2772 struct kvm_device *dev = filp->private_data;
2773
2774 switch (ioctl) {
2775 case KVM_SET_DEVICE_ATTR:
2776 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2777 case KVM_GET_DEVICE_ATTR:
2778 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2779 case KVM_HAS_DEVICE_ATTR:
2780 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2781 default:
2782 if (dev->ops->ioctl)
2783 return dev->ops->ioctl(dev, ioctl, arg);
2784
2785 return -ENOTTY;
2786 }
2787}
2788
2789static int kvm_device_release(struct inode *inode, struct file *filp)
2790{
2791 struct kvm_device *dev = filp->private_data;
2792 struct kvm *kvm = dev->kvm;
2793
2794 kvm_put_kvm(kvm);
2795 return 0;
2796}
2797
2798static const struct file_operations kvm_device_fops = {
2799 .unlocked_ioctl = kvm_device_ioctl,
2800#ifdef CONFIG_KVM_COMPAT
2801 .compat_ioctl = kvm_device_ioctl,
2802#endif
2803 .release = kvm_device_release,
2804};
2805
2806struct kvm_device *kvm_device_from_filp(struct file *filp)
2807{
2808 if (filp->f_op != &kvm_device_fops)
2809 return NULL;
2810
2811 return filp->private_data;
2812}
2813
2814static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2815#ifdef CONFIG_KVM_MPIC
2816 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2817 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2818#endif
2819};
2820
2821int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2822{
2823 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2824 return -ENOSPC;
2825
2826 if (kvm_device_ops_table[type] != NULL)
2827 return -EEXIST;
2828
2829 kvm_device_ops_table[type] = ops;
2830 return 0;
2831}
2832
2833void kvm_unregister_device_ops(u32 type)
2834{
2835 if (kvm_device_ops_table[type] != NULL)
2836 kvm_device_ops_table[type] = NULL;
2837}
2838
2839static int kvm_ioctl_create_device(struct kvm *kvm,
2840 struct kvm_create_device *cd)
2841{
2842 struct kvm_device_ops *ops = NULL;
2843 struct kvm_device *dev;
2844 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2845 int ret;
2846
2847 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2848 return -ENODEV;
2849
2850 ops = kvm_device_ops_table[cd->type];
2851 if (ops == NULL)
2852 return -ENODEV;
2853
2854 if (test)
2855 return 0;
2856
2857 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2858 if (!dev)
2859 return -ENOMEM;
2860
2861 dev->ops = ops;
2862 dev->kvm = kvm;
2863
2864 mutex_lock(&kvm->lock);
2865 ret = ops->create(dev, cd->type);
2866 if (ret < 0) {
2867 mutex_unlock(&kvm->lock);
2868 kfree(dev);
2869 return ret;
2870 }
2871 list_add(&dev->vm_node, &kvm->devices);
2872 mutex_unlock(&kvm->lock);
2873
2874 if (ops->init)
2875 ops->init(dev);
2876
2877 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2878 if (ret < 0) {
2879 mutex_lock(&kvm->lock);
2880 list_del(&dev->vm_node);
2881 mutex_unlock(&kvm->lock);
2882 ops->destroy(dev);
2883 return ret;
2884 }
2885
2886 kvm_get_kvm(kvm);
2887 cd->fd = ret;
2888 return 0;
2889}
2890
2891static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2892{
2893 switch (arg) {
2894 case KVM_CAP_USER_MEMORY:
2895 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2896 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2897 case KVM_CAP_INTERNAL_ERROR_DATA:
2898#ifdef CONFIG_HAVE_KVM_MSI
2899 case KVM_CAP_SIGNAL_MSI:
2900#endif
2901#ifdef CONFIG_HAVE_KVM_IRQFD
2902 case KVM_CAP_IRQFD:
2903 case KVM_CAP_IRQFD_RESAMPLE:
2904#endif
2905 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2906 case KVM_CAP_CHECK_EXTENSION_VM:
2907 return 1;
2908#ifdef CONFIG_KVM_MMIO
2909 case KVM_CAP_COALESCED_MMIO:
2910 return KVM_COALESCED_MMIO_PAGE_OFFSET;
2911#endif
2912#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2913 case KVM_CAP_IRQ_ROUTING:
2914 return KVM_MAX_IRQ_ROUTES;
2915#endif
2916#if KVM_ADDRESS_SPACE_NUM > 1
2917 case KVM_CAP_MULTI_ADDRESS_SPACE:
2918 return KVM_ADDRESS_SPACE_NUM;
2919#endif
2920 case KVM_CAP_MAX_VCPU_ID:
2921 return KVM_MAX_VCPU_ID;
2922 default:
2923 break;
2924 }
2925 return kvm_vm_ioctl_check_extension(kvm, arg);
2926}
2927
2928static long kvm_vm_ioctl(struct file *filp,
2929 unsigned int ioctl, unsigned long arg)
2930{
2931 struct kvm *kvm = filp->private_data;
2932 void __user *argp = (void __user *)arg;
2933 int r;
2934
2935 if (kvm->mm != current->mm)
2936 return -EIO;
2937 switch (ioctl) {
2938 case KVM_CREATE_VCPU:
2939 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2940 break;
2941 case KVM_SET_USER_MEMORY_REGION: {
2942 struct kvm_userspace_memory_region kvm_userspace_mem;
2943
2944 r = -EFAULT;
2945 if (copy_from_user(&kvm_userspace_mem, argp,
2946 sizeof(kvm_userspace_mem)))
2947 goto out;
2948
2949 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2950 break;
2951 }
2952 case KVM_GET_DIRTY_LOG: {
2953 struct kvm_dirty_log log;
2954
2955 r = -EFAULT;
2956 if (copy_from_user(&log, argp, sizeof(log)))
2957 goto out;
2958 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2959 break;
2960 }
2961#ifdef CONFIG_KVM_MMIO
2962 case KVM_REGISTER_COALESCED_MMIO: {
2963 struct kvm_coalesced_mmio_zone zone;
2964
2965 r = -EFAULT;
2966 if (copy_from_user(&zone, argp, sizeof(zone)))
2967 goto out;
2968 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2969 break;
2970 }
2971 case KVM_UNREGISTER_COALESCED_MMIO: {
2972 struct kvm_coalesced_mmio_zone zone;
2973
2974 r = -EFAULT;
2975 if (copy_from_user(&zone, argp, sizeof(zone)))
2976 goto out;
2977 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2978 break;
2979 }
2980#endif
2981 case KVM_IRQFD: {
2982 struct kvm_irqfd data;
2983
2984 r = -EFAULT;
2985 if (copy_from_user(&data, argp, sizeof(data)))
2986 goto out;
2987 r = kvm_irqfd(kvm, &data);
2988 break;
2989 }
2990 case KVM_IOEVENTFD: {
2991 struct kvm_ioeventfd data;
2992
2993 r = -EFAULT;
2994 if (copy_from_user(&data, argp, sizeof(data)))
2995 goto out;
2996 r = kvm_ioeventfd(kvm, &data);
2997 break;
2998 }
2999#ifdef CONFIG_HAVE_KVM_MSI
3000 case KVM_SIGNAL_MSI: {
3001 struct kvm_msi msi;
3002
3003 r = -EFAULT;
3004 if (copy_from_user(&msi, argp, sizeof(msi)))
3005 goto out;
3006 r = kvm_send_userspace_msi(kvm, &msi);
3007 break;
3008 }
3009#endif
3010#ifdef __KVM_HAVE_IRQ_LINE
3011 case KVM_IRQ_LINE_STATUS:
3012 case KVM_IRQ_LINE: {
3013 struct kvm_irq_level irq_event;
3014
3015 r = -EFAULT;
3016 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3017 goto out;
3018
3019 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3020 ioctl == KVM_IRQ_LINE_STATUS);
3021 if (r)
3022 goto out;
3023
3024 r = -EFAULT;
3025 if (ioctl == KVM_IRQ_LINE_STATUS) {
3026 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3027 goto out;
3028 }
3029
3030 r = 0;
3031 break;
3032 }
3033#endif
3034#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3035 case KVM_SET_GSI_ROUTING: {
3036 struct kvm_irq_routing routing;
3037 struct kvm_irq_routing __user *urouting;
3038 struct kvm_irq_routing_entry *entries = NULL;
3039
3040 r = -EFAULT;
3041 if (copy_from_user(&routing, argp, sizeof(routing)))
3042 goto out;
3043 r = -EINVAL;
3044 if (!kvm_arch_can_set_irq_routing(kvm))
3045 goto out;
3046 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3047 goto out;
3048 if (routing.flags)
3049 goto out;
3050 if (routing.nr) {
3051 r = -ENOMEM;
3052 entries = vmalloc(routing.nr * sizeof(*entries));
3053 if (!entries)
3054 goto out;
3055 r = -EFAULT;
3056 urouting = argp;
3057 if (copy_from_user(entries, urouting->entries,
3058 routing.nr * sizeof(*entries)))
3059 goto out_free_irq_routing;
3060 }
3061 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3062 routing.flags);
3063out_free_irq_routing:
3064 vfree(entries);
3065 break;
3066 }
3067#endif
3068 case KVM_CREATE_DEVICE: {
3069 struct kvm_create_device cd;
3070
3071 r = -EFAULT;
3072 if (copy_from_user(&cd, argp, sizeof(cd)))
3073 goto out;
3074
3075 r = kvm_ioctl_create_device(kvm, &cd);
3076 if (r)
3077 goto out;
3078
3079 r = -EFAULT;
3080 if (copy_to_user(argp, &cd, sizeof(cd)))
3081 goto out;
3082
3083 r = 0;
3084 break;
3085 }
3086 case KVM_CHECK_EXTENSION:
3087 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3088 break;
3089 default:
3090 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3091 }
3092out:
3093 return r;
3094}
3095
3096#ifdef CONFIG_KVM_COMPAT
3097struct compat_kvm_dirty_log {
3098 __u32 slot;
3099 __u32 padding1;
3100 union {
3101 compat_uptr_t dirty_bitmap;
3102 __u64 padding2;
3103 };
3104};
3105
3106static long kvm_vm_compat_ioctl(struct file *filp,
3107 unsigned int ioctl, unsigned long arg)
3108{
3109 struct kvm *kvm = filp->private_data;
3110 int r;
3111
3112 if (kvm->mm != current->mm)
3113 return -EIO;
3114 switch (ioctl) {
3115 case KVM_GET_DIRTY_LOG: {
3116 struct compat_kvm_dirty_log compat_log;
3117 struct kvm_dirty_log log;
3118
3119 if (copy_from_user(&compat_log, (void __user *)arg,
3120 sizeof(compat_log)))
3121 return -EFAULT;
3122 log.slot = compat_log.slot;
3123 log.padding1 = compat_log.padding1;
3124 log.padding2 = compat_log.padding2;
3125 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3126
3127 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3128 break;
3129 }
3130 default:
3131 r = kvm_vm_ioctl(filp, ioctl, arg);
3132 }
3133 return r;
3134}
3135#endif
3136
3137static struct file_operations kvm_vm_fops = {
3138 .release = kvm_vm_release,
3139 .unlocked_ioctl = kvm_vm_ioctl,
3140#ifdef CONFIG_KVM_COMPAT
3141 .compat_ioctl = kvm_vm_compat_ioctl,
3142#endif
3143 .llseek = noop_llseek,
3144};
3145
3146static int kvm_dev_ioctl_create_vm(unsigned long type)
3147{
3148 int r;
3149 struct kvm *kvm;
3150 struct file *file;
3151
3152 kvm = kvm_create_vm(type);
3153 if (IS_ERR(kvm))
3154 return PTR_ERR(kvm);
3155#ifdef CONFIG_KVM_MMIO
3156 r = kvm_coalesced_mmio_init(kvm);
3157 if (r < 0) {
3158 kvm_put_kvm(kvm);
3159 return r;
3160 }
3161#endif
3162 r = get_unused_fd_flags(O_CLOEXEC);
3163 if (r < 0) {
3164 kvm_put_kvm(kvm);
3165 return r;
3166 }
3167 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3168 if (IS_ERR(file)) {
3169 put_unused_fd(r);
3170 kvm_put_kvm(kvm);
3171 return PTR_ERR(file);
3172 }
3173
3174
3175
3176
3177
3178
3179
3180 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3181 put_unused_fd(r);
3182 fput(file);
3183 return -ENOMEM;
3184 }
3185 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm);
3186
3187 fd_install(r, file);
3188 return r;
3189}
3190
3191static long kvm_dev_ioctl(struct file *filp,
3192 unsigned int ioctl, unsigned long arg)
3193{
3194 long r = -EINVAL;
3195
3196 switch (ioctl) {
3197 case KVM_GET_API_VERSION:
3198 if (arg)
3199 goto out;
3200 r = KVM_API_VERSION;
3201 break;
3202 case KVM_CREATE_VM:
3203 r = kvm_dev_ioctl_create_vm(arg);
3204 break;
3205 case KVM_CHECK_EXTENSION:
3206 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3207 break;
3208 case KVM_GET_VCPU_MMAP_SIZE:
3209 if (arg)
3210 goto out;
3211 r = PAGE_SIZE;
3212#ifdef CONFIG_X86
3213 r += PAGE_SIZE;
3214#endif
3215#ifdef CONFIG_KVM_MMIO
3216 r += PAGE_SIZE;
3217#endif
3218 break;
3219 case KVM_TRACE_ENABLE:
3220 case KVM_TRACE_PAUSE:
3221 case KVM_TRACE_DISABLE:
3222 r = -EOPNOTSUPP;
3223 break;
3224 default:
3225 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3226 }
3227out:
3228 return r;
3229}
3230
3231static struct file_operations kvm_chardev_ops = {
3232 .unlocked_ioctl = kvm_dev_ioctl,
3233 .compat_ioctl = kvm_dev_ioctl,
3234 .llseek = noop_llseek,
3235};
3236
3237static struct miscdevice kvm_dev = {
3238 KVM_MINOR,
3239 "kvm",
3240 &kvm_chardev_ops,
3241};
3242
3243static void hardware_enable_nolock(void *junk)
3244{
3245 int cpu = raw_smp_processor_id();
3246 int r;
3247
3248 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3249 return;
3250
3251 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3252
3253 r = kvm_arch_hardware_enable();
3254
3255 if (r) {
3256 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3257 atomic_inc(&hardware_enable_failed);
3258 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3259 }
3260}
3261
3262static int kvm_starting_cpu(unsigned int cpu)
3263{
3264 raw_spin_lock(&kvm_count_lock);
3265 if (kvm_usage_count)
3266 hardware_enable_nolock(NULL);
3267 raw_spin_unlock(&kvm_count_lock);
3268 return 0;
3269}
3270
3271static void hardware_disable_nolock(void *junk)
3272{
3273 int cpu = raw_smp_processor_id();
3274
3275 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3276 return;
3277 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3278 kvm_arch_hardware_disable();
3279}
3280
3281static int kvm_dying_cpu(unsigned int cpu)
3282{
3283 raw_spin_lock(&kvm_count_lock);
3284 if (kvm_usage_count)
3285 hardware_disable_nolock(NULL);
3286 raw_spin_unlock(&kvm_count_lock);
3287 return 0;
3288}
3289
3290static void hardware_disable_all_nolock(void)
3291{
3292 BUG_ON(!kvm_usage_count);
3293
3294 kvm_usage_count--;
3295 if (!kvm_usage_count)
3296 on_each_cpu(hardware_disable_nolock, NULL, 1);
3297}
3298
3299static void hardware_disable_all(void)
3300{
3301 raw_spin_lock(&kvm_count_lock);
3302 hardware_disable_all_nolock();
3303 raw_spin_unlock(&kvm_count_lock);
3304}
3305
3306static int hardware_enable_all(void)
3307{
3308 int r = 0;
3309
3310 raw_spin_lock(&kvm_count_lock);
3311
3312 kvm_usage_count++;
3313 if (kvm_usage_count == 1) {
3314 atomic_set(&hardware_enable_failed, 0);
3315 on_each_cpu(hardware_enable_nolock, NULL, 1);
3316
3317 if (atomic_read(&hardware_enable_failed)) {
3318 hardware_disable_all_nolock();
3319 r = -EBUSY;
3320 }
3321 }
3322
3323 raw_spin_unlock(&kvm_count_lock);
3324
3325 return r;
3326}
3327
3328static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3329 void *v)
3330{
3331
3332
3333
3334
3335
3336
3337 pr_info("kvm: exiting hardware virtualization\n");
3338 kvm_rebooting = true;
3339 on_each_cpu(hardware_disable_nolock, NULL, 1);
3340 return NOTIFY_OK;
3341}
3342
3343static struct notifier_block kvm_reboot_notifier = {
3344 .notifier_call = kvm_reboot,
3345 .priority = 0,
3346};
3347
3348static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3349{
3350 int i;
3351
3352 for (i = 0; i < bus->dev_count; i++) {
3353 struct kvm_io_device *pos = bus->range[i].dev;
3354
3355 kvm_iodevice_destructor(pos);
3356 }
3357 kfree(bus);
3358}
3359
3360static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3361 const struct kvm_io_range *r2)
3362{
3363 gpa_t addr1 = r1->addr;
3364 gpa_t addr2 = r2->addr;
3365
3366 if (addr1 < addr2)
3367 return -1;
3368
3369
3370
3371
3372
3373
3374 if (r2->len) {
3375 addr1 += r1->len;
3376 addr2 += r2->len;
3377 }
3378
3379 if (addr1 > addr2)
3380 return 1;
3381
3382 return 0;
3383}
3384
3385static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3386{
3387 return kvm_io_bus_cmp(p1, p2);
3388}
3389
3390static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3391 gpa_t addr, int len)
3392{
3393 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3394 .addr = addr,
3395 .len = len,
3396 .dev = dev,
3397 };
3398
3399 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3400 kvm_io_bus_sort_cmp, NULL);
3401
3402 return 0;
3403}
3404
3405static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3406 gpa_t addr, int len)
3407{
3408 struct kvm_io_range *range, key;
3409 int off;
3410
3411 key = (struct kvm_io_range) {
3412 .addr = addr,
3413 .len = len,
3414 };
3415
3416 range = bsearch(&key, bus->range, bus->dev_count,
3417 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3418 if (range == NULL)
3419 return -ENOENT;
3420
3421 off = range - bus->range;
3422
3423 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3424 off--;
3425
3426 return off;
3427}
3428
3429static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3430 struct kvm_io_range *range, const void *val)
3431{
3432 int idx;
3433
3434 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3435 if (idx < 0)
3436 return -EOPNOTSUPP;
3437
3438 while (idx < bus->dev_count &&
3439 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3440 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3441 range->len, val))
3442 return idx;
3443 idx++;
3444 }
3445
3446 return -EOPNOTSUPP;
3447}
3448
3449
3450int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3451 int len, const void *val)
3452{
3453 struct kvm_io_bus *bus;
3454 struct kvm_io_range range;
3455 int r;
3456
3457 range = (struct kvm_io_range) {
3458 .addr = addr,
3459 .len = len,
3460 };
3461
3462 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3463 if (!bus)
3464 return -ENOMEM;
3465 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3466 return r < 0 ? r : 0;
3467}
3468
3469
3470int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3471 gpa_t addr, int len, const void *val, long cookie)
3472{
3473 struct kvm_io_bus *bus;
3474 struct kvm_io_range range;
3475
3476 range = (struct kvm_io_range) {
3477 .addr = addr,
3478 .len = len,
3479 };
3480
3481 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3482 if (!bus)
3483 return -ENOMEM;
3484
3485
3486 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3487 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3488 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3489 val))
3490 return cookie;
3491
3492
3493
3494
3495
3496 return __kvm_io_bus_write(vcpu, bus, &range, val);
3497}
3498
3499static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3500 struct kvm_io_range *range, void *val)
3501{
3502 int idx;
3503
3504 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3505 if (idx < 0)
3506 return -EOPNOTSUPP;
3507
3508 while (idx < bus->dev_count &&
3509 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3510 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3511 range->len, val))
3512 return idx;
3513 idx++;
3514 }
3515
3516 return -EOPNOTSUPP;
3517}
3518EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3519
3520
3521int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3522 int len, void *val)
3523{
3524 struct kvm_io_bus *bus;
3525 struct kvm_io_range range;
3526 int r;
3527
3528 range = (struct kvm_io_range) {
3529 .addr = addr,
3530 .len = len,
3531 };
3532
3533 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3534 if (!bus)
3535 return -ENOMEM;
3536 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3537 return r < 0 ? r : 0;
3538}
3539
3540
3541
3542int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3543 int len, struct kvm_io_device *dev)
3544{
3545 struct kvm_io_bus *new_bus, *bus;
3546
3547 bus = kvm_get_bus(kvm, bus_idx);
3548 if (!bus)
3549 return -ENOMEM;
3550
3551
3552 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3553 return -ENOSPC;
3554
3555 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3556 sizeof(struct kvm_io_range)), GFP_KERNEL);
3557 if (!new_bus)
3558 return -ENOMEM;
3559 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3560 sizeof(struct kvm_io_range)));
3561 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3562 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3563 synchronize_srcu_expedited(&kvm->srcu);
3564 kfree(bus);
3565
3566 return 0;
3567}
3568
3569
3570void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3571 struct kvm_io_device *dev)
3572{
3573 int i;
3574 struct kvm_io_bus *new_bus, *bus;
3575
3576 bus = kvm_get_bus(kvm, bus_idx);
3577 if (!bus)
3578 return;
3579
3580 for (i = 0; i < bus->dev_count; i++)
3581 if (bus->range[i].dev == dev) {
3582 break;
3583 }
3584
3585 if (i == bus->dev_count)
3586 return;
3587
3588 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3589 sizeof(struct kvm_io_range)), GFP_KERNEL);
3590 if (!new_bus) {
3591 pr_err("kvm: failed to shrink bus, removing it completely\n");
3592 goto broken;
3593 }
3594
3595 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3596 new_bus->dev_count--;
3597 memcpy(new_bus->range + i, bus->range + i + 1,
3598 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3599
3600broken:
3601 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3602 synchronize_srcu_expedited(&kvm->srcu);
3603 kfree(bus);
3604 return;
3605}
3606
3607struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3608 gpa_t addr)
3609{
3610 struct kvm_io_bus *bus;
3611 int dev_idx, srcu_idx;
3612 struct kvm_io_device *iodev = NULL;
3613
3614 srcu_idx = srcu_read_lock(&kvm->srcu);
3615
3616 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3617 if (!bus)
3618 goto out_unlock;
3619
3620 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3621 if (dev_idx < 0)
3622 goto out_unlock;
3623
3624 iodev = bus->range[dev_idx].dev;
3625
3626out_unlock:
3627 srcu_read_unlock(&kvm->srcu, srcu_idx);
3628
3629 return iodev;
3630}
3631EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3632
3633static int kvm_debugfs_open(struct inode *inode, struct file *file,
3634 int (*get)(void *, u64 *), int (*set)(void *, u64),
3635 const char *fmt)
3636{
3637 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3638 inode->i_private;
3639
3640
3641
3642
3643
3644
3645 if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
3646 return -ENOENT;
3647
3648 if (simple_attr_open(inode, file, get, set, fmt)) {
3649 kvm_put_kvm(stat_data->kvm);
3650 return -ENOMEM;
3651 }
3652
3653 return 0;
3654}
3655
3656static int kvm_debugfs_release(struct inode *inode, struct file *file)
3657{
3658 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3659 inode->i_private;
3660
3661 simple_attr_release(inode, file);
3662 kvm_put_kvm(stat_data->kvm);
3663
3664 return 0;
3665}
3666
3667static int vm_stat_get_per_vm(void *data, u64 *val)
3668{
3669 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3670
3671 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3672
3673 return 0;
3674}
3675
3676static int vm_stat_clear_per_vm(void *data, u64 val)
3677{
3678 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3679
3680 if (val)
3681 return -EINVAL;
3682
3683 *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0;
3684
3685 return 0;
3686}
3687
3688static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3689{
3690 __simple_attr_check_format("%llu\n", 0ull);
3691 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3692 vm_stat_clear_per_vm, "%llu\n");
3693}
3694
3695static const struct file_operations vm_stat_get_per_vm_fops = {
3696 .owner = THIS_MODULE,
3697 .open = vm_stat_get_per_vm_open,
3698 .release = kvm_debugfs_release,
3699 .read = simple_attr_read,
3700 .write = simple_attr_write,
3701 .llseek = no_llseek,
3702};
3703
3704static int vcpu_stat_get_per_vm(void *data, u64 *val)
3705{
3706 int i;
3707 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3708 struct kvm_vcpu *vcpu;
3709
3710 *val = 0;
3711
3712 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3713 *val += *(u64 *)((void *)vcpu + stat_data->offset);
3714
3715 return 0;
3716}
3717
3718static int vcpu_stat_clear_per_vm(void *data, u64 val)
3719{
3720 int i;
3721 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3722 struct kvm_vcpu *vcpu;
3723
3724 if (val)
3725 return -EINVAL;
3726
3727 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3728 *(u64 *)((void *)vcpu + stat_data->offset) = 0;
3729
3730 return 0;
3731}
3732
3733static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3734{
3735 __simple_attr_check_format("%llu\n", 0ull);
3736 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3737 vcpu_stat_clear_per_vm, "%llu\n");
3738}
3739
3740static const struct file_operations vcpu_stat_get_per_vm_fops = {
3741 .owner = THIS_MODULE,
3742 .open = vcpu_stat_get_per_vm_open,
3743 .release = kvm_debugfs_release,
3744 .read = simple_attr_read,
3745 .write = simple_attr_write,
3746 .llseek = no_llseek,
3747};
3748
3749static const struct file_operations *stat_fops_per_vm[] = {
3750 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3751 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
3752};
3753
3754static int vm_stat_get(void *_offset, u64 *val)
3755{
3756 unsigned offset = (long)_offset;
3757 struct kvm *kvm;
3758 struct kvm_stat_data stat_tmp = {.offset = offset};
3759 u64 tmp_val;
3760
3761 *val = 0;
3762 spin_lock(&kvm_lock);
3763 list_for_each_entry(kvm, &vm_list, vm_list) {
3764 stat_tmp.kvm = kvm;
3765 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3766 *val += tmp_val;
3767 }
3768 spin_unlock(&kvm_lock);
3769 return 0;
3770}
3771
3772static int vm_stat_clear(void *_offset, u64 val)
3773{
3774 unsigned offset = (long)_offset;
3775 struct kvm *kvm;
3776 struct kvm_stat_data stat_tmp = {.offset = offset};
3777
3778 if (val)
3779 return -EINVAL;
3780
3781 spin_lock(&kvm_lock);
3782 list_for_each_entry(kvm, &vm_list, vm_list) {
3783 stat_tmp.kvm = kvm;
3784 vm_stat_clear_per_vm((void *)&stat_tmp, 0);
3785 }
3786 spin_unlock(&kvm_lock);
3787
3788 return 0;
3789}
3790
3791DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
3792
3793static int vcpu_stat_get(void *_offset, u64 *val)
3794{
3795 unsigned offset = (long)_offset;
3796 struct kvm *kvm;
3797 struct kvm_stat_data stat_tmp = {.offset = offset};
3798 u64 tmp_val;
3799
3800 *val = 0;
3801 spin_lock(&kvm_lock);
3802 list_for_each_entry(kvm, &vm_list, vm_list) {
3803 stat_tmp.kvm = kvm;
3804 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3805 *val += tmp_val;
3806 }
3807 spin_unlock(&kvm_lock);
3808 return 0;
3809}
3810
3811static int vcpu_stat_clear(void *_offset, u64 val)
3812{
3813 unsigned offset = (long)_offset;
3814 struct kvm *kvm;
3815 struct kvm_stat_data stat_tmp = {.offset = offset};
3816
3817 if (val)
3818 return -EINVAL;
3819
3820 spin_lock(&kvm_lock);
3821 list_for_each_entry(kvm, &vm_list, vm_list) {
3822 stat_tmp.kvm = kvm;
3823 vcpu_stat_clear_per_vm((void *)&stat_tmp, 0);
3824 }
3825 spin_unlock(&kvm_lock);
3826
3827 return 0;
3828}
3829
3830DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
3831 "%llu\n");
3832
3833static const struct file_operations *stat_fops[] = {
3834 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3835 [KVM_STAT_VM] = &vm_stat_fops,
3836};
3837
3838static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
3839{
3840 struct kobj_uevent_env *env;
3841 unsigned long long created, active;
3842
3843 if (!kvm_dev.this_device || !kvm)
3844 return;
3845
3846 spin_lock(&kvm_lock);
3847 if (type == KVM_EVENT_CREATE_VM) {
3848 kvm_createvm_count++;
3849 kvm_active_vms++;
3850 } else if (type == KVM_EVENT_DESTROY_VM) {
3851 kvm_active_vms--;
3852 }
3853 created = kvm_createvm_count;
3854 active = kvm_active_vms;
3855 spin_unlock(&kvm_lock);
3856
3857 env = kzalloc(sizeof(*env), GFP_KERNEL);
3858 if (!env)
3859 return;
3860
3861 add_uevent_var(env, "CREATED=%llu", created);
3862 add_uevent_var(env, "COUNT=%llu", active);
3863
3864 if (type == KVM_EVENT_CREATE_VM) {
3865 add_uevent_var(env, "EVENT=create");
3866 kvm->userspace_pid = task_pid_nr(current);
3867 } else if (type == KVM_EVENT_DESTROY_VM) {
3868 add_uevent_var(env, "EVENT=destroy");
3869 }
3870 add_uevent_var(env, "PID=%d", kvm->userspace_pid);
3871
3872 if (kvm->debugfs_dentry) {
3873 char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL);
3874
3875 if (p) {
3876 tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
3877 if (!IS_ERR(tmp))
3878 add_uevent_var(env, "STATS_PATH=%s", tmp);
3879 kfree(p);
3880 }
3881 }
3882
3883 env->envp[env->envp_idx++] = NULL;
3884 kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
3885 kfree(env);
3886}
3887
3888static int kvm_init_debug(void)
3889{
3890 int r = -EEXIST;
3891 struct kvm_stats_debugfs_item *p;
3892
3893 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3894 if (kvm_debugfs_dir == NULL)
3895 goto out;
3896
3897 kvm_debugfs_num_entries = 0;
3898 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3899 if (!debugfs_create_file(p->name, 0644, kvm_debugfs_dir,
3900 (void *)(long)p->offset,
3901 stat_fops[p->kind]))
3902 goto out_dir;
3903 }
3904
3905 return 0;
3906
3907out_dir:
3908 debugfs_remove_recursive(kvm_debugfs_dir);
3909out:
3910 return r;
3911}
3912
3913static int kvm_suspend(void)
3914{
3915 if (kvm_usage_count)
3916 hardware_disable_nolock(NULL);
3917 return 0;
3918}
3919
3920static void kvm_resume(void)
3921{
3922 if (kvm_usage_count) {
3923 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3924 hardware_enable_nolock(NULL);
3925 }
3926}
3927
3928static struct syscore_ops kvm_syscore_ops = {
3929 .suspend = kvm_suspend,
3930 .resume = kvm_resume,
3931};
3932
3933static inline
3934struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3935{
3936 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3937}
3938
3939static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3940{
3941 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3942
3943 if (vcpu->preempted)
3944 vcpu->preempted = false;
3945
3946 kvm_arch_sched_in(vcpu, cpu);
3947
3948 kvm_arch_vcpu_load(vcpu, cpu);
3949}
3950
3951static void kvm_sched_out(struct preempt_notifier *pn,
3952 struct task_struct *next)
3953{
3954 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3955
3956 if (current->state == TASK_RUNNING)
3957 vcpu->preempted = true;
3958 kvm_arch_vcpu_put(vcpu);
3959}
3960
3961int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3962 struct module *module)
3963{
3964 int r;
3965 int cpu;
3966
3967 r = kvm_arch_init(opaque);
3968 if (r)
3969 goto out_fail;
3970
3971
3972
3973
3974
3975
3976
3977
3978 r = kvm_irqfd_init();
3979 if (r)
3980 goto out_irqfd;
3981
3982 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3983 r = -ENOMEM;
3984 goto out_free_0;
3985 }
3986
3987 r = kvm_arch_hardware_setup();
3988 if (r < 0)
3989 goto out_free_0a;
3990
3991 for_each_online_cpu(cpu) {
3992 smp_call_function_single(cpu,
3993 kvm_arch_check_processor_compat,
3994 &r, 1);
3995 if (r < 0)
3996 goto out_free_1;
3997 }
3998
3999 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
4000 kvm_starting_cpu, kvm_dying_cpu);
4001 if (r)
4002 goto out_free_2;
4003 register_reboot_notifier(&kvm_reboot_notifier);
4004
4005
4006 if (!vcpu_align)
4007 vcpu_align = __alignof__(struct kvm_vcpu);
4008 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
4009 0, NULL);
4010 if (!kvm_vcpu_cache) {
4011 r = -ENOMEM;
4012 goto out_free_3;
4013 }
4014
4015 r = kvm_async_pf_init();
4016 if (r)
4017 goto out_free;
4018
4019 kvm_chardev_ops.owner = module;
4020 kvm_vm_fops.owner = module;
4021 kvm_vcpu_fops.owner = module;
4022
4023 r = misc_register(&kvm_dev);
4024 if (r) {
4025 pr_err("kvm: misc device register failed\n");
4026 goto out_unreg;
4027 }
4028
4029 register_syscore_ops(&kvm_syscore_ops);
4030
4031 kvm_preempt_ops.sched_in = kvm_sched_in;
4032 kvm_preempt_ops.sched_out = kvm_sched_out;
4033
4034 r = kvm_init_debug();
4035 if (r) {
4036 pr_err("kvm: create debugfs files failed\n");
4037 goto out_undebugfs;
4038 }
4039
4040 r = kvm_vfio_ops_init();
4041 WARN_ON(r);
4042
4043 return 0;
4044
4045out_undebugfs:
4046 unregister_syscore_ops(&kvm_syscore_ops);
4047 misc_deregister(&kvm_dev);
4048out_unreg:
4049 kvm_async_pf_deinit();
4050out_free:
4051 kmem_cache_destroy(kvm_vcpu_cache);
4052out_free_3:
4053 unregister_reboot_notifier(&kvm_reboot_notifier);
4054 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4055out_free_2:
4056out_free_1:
4057 kvm_arch_hardware_unsetup();
4058out_free_0a:
4059 free_cpumask_var(cpus_hardware_enabled);
4060out_free_0:
4061 kvm_irqfd_exit();
4062out_irqfd:
4063 kvm_arch_exit();
4064out_fail:
4065 return r;
4066}
4067EXPORT_SYMBOL_GPL(kvm_init);
4068
4069void kvm_exit(void)
4070{
4071 debugfs_remove_recursive(kvm_debugfs_dir);
4072 misc_deregister(&kvm_dev);
4073 kmem_cache_destroy(kvm_vcpu_cache);
4074 kvm_async_pf_deinit();
4075 unregister_syscore_ops(&kvm_syscore_ops);
4076 unregister_reboot_notifier(&kvm_reboot_notifier);
4077 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
4078 on_each_cpu(hardware_disable_nolock, NULL, 1);
4079 kvm_arch_hardware_unsetup();
4080 kvm_arch_exit();
4081 kvm_irqfd_exit();
4082 free_cpumask_var(cpus_hardware_enabled);
4083 kvm_vfio_ops_exit();
4084}
4085EXPORT_SYMBOL_GPL(kvm_exit);
4086