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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.h>
36#include <linux/cpumask.h>
37#include <linux/smp.h>
38#include <linux/anon_inodes.h>
39#include <linux/profile.h>
40#include <linux/kvm_para.h>
41#include <linux/pagemap.h>
42#include <linux/mman.h>
43#include <linux/swap.h>
44#include <linux/bitops.h>
45#include <linux/spinlock.h>
46#include <linux/compat.h>
47#include <linux/srcu.h>
48#include <linux/hugetlb.h>
49#include <linux/slab.h>
50#include <linux/sort.h>
51#include <linux/bsearch.h>
52
53#include <asm/processor.h>
54#include <asm/io.h>
55#include <asm/ioctl.h>
56#include <asm/uaccess.h>
57#include <asm/pgtable.h>
58
59#include "coalesced_mmio.h"
60#include "async_pf.h"
61#include "vfio.h"
62
63#define CREATE_TRACE_POINTS
64#include <trace/events/kvm.h>
65
66
67#define ITOA_MAX_LEN 12
68
69MODULE_AUTHOR("Qumranet");
70MODULE_LICENSE("GPL");
71
72
73static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
74module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR);
75
76
77static unsigned int halt_poll_ns_grow = 2;
78module_param(halt_poll_ns_grow, uint, S_IRUGO | S_IWUSR);
79
80
81static unsigned int halt_poll_ns_shrink;
82module_param(halt_poll_ns_shrink, uint, S_IRUGO | S_IWUSR);
83
84
85
86
87
88
89
90DEFINE_SPINLOCK(kvm_lock);
91static DEFINE_RAW_SPINLOCK(kvm_count_lock);
92LIST_HEAD(vm_list);
93
94static cpumask_var_t cpus_hardware_enabled;
95static int kvm_usage_count;
96static atomic_t hardware_enable_failed;
97
98struct kmem_cache *kvm_vcpu_cache;
99EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
100
101static __read_mostly struct preempt_ops kvm_preempt_ops;
102
103struct dentry *kvm_debugfs_dir;
104EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
105
106static int kvm_debugfs_num_entries;
107static const struct file_operations *stat_fops_per_vm[];
108
109static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
110 unsigned long arg);
111#ifdef CONFIG_KVM_COMPAT
112static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
113 unsigned long arg);
114#endif
115static int hardware_enable_all(void);
116static void hardware_disable_all(void);
117
118static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
119
120static void kvm_release_pfn_dirty(kvm_pfn_t pfn);
121static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
122
123__visible bool kvm_rebooting;
124EXPORT_SYMBOL_GPL(kvm_rebooting);
125
126static bool largepages_enabled = true;
127
128bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
129{
130 if (pfn_valid(pfn))
131 return PageReserved(pfn_to_page(pfn));
132
133 return true;
134}
135
136
137
138
139int vcpu_load(struct kvm_vcpu *vcpu)
140{
141 int cpu;
142
143 if (mutex_lock_killable(&vcpu->mutex))
144 return -EINTR;
145 cpu = get_cpu();
146 preempt_notifier_register(&vcpu->preempt_notifier);
147 kvm_arch_vcpu_load(vcpu, cpu);
148 put_cpu();
149 return 0;
150}
151EXPORT_SYMBOL_GPL(vcpu_load);
152
153void vcpu_put(struct kvm_vcpu *vcpu)
154{
155 preempt_disable();
156 kvm_arch_vcpu_put(vcpu);
157 preempt_notifier_unregister(&vcpu->preempt_notifier);
158 preempt_enable();
159 mutex_unlock(&vcpu->mutex);
160}
161EXPORT_SYMBOL_GPL(vcpu_put);
162
163static void ack_flush(void *_completed)
164{
165}
166
167bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
168{
169 int i, cpu, me;
170 cpumask_var_t cpus;
171 bool called = true;
172 struct kvm_vcpu *vcpu;
173
174 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
175
176 me = get_cpu();
177 kvm_for_each_vcpu(i, vcpu, kvm) {
178 kvm_make_request(req, vcpu);
179 cpu = vcpu->cpu;
180
181
182 smp_mb__after_atomic();
183
184 if (cpus != NULL && cpu != -1 && cpu != me &&
185 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
186 cpumask_set_cpu(cpu, cpus);
187 }
188 if (unlikely(cpus == NULL))
189 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
190 else if (!cpumask_empty(cpus))
191 smp_call_function_many(cpus, ack_flush, NULL, 1);
192 else
193 called = false;
194 put_cpu();
195 free_cpumask_var(cpus);
196 return called;
197}
198
199#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
200void kvm_flush_remote_tlbs(struct kvm *kvm)
201{
202
203
204
205
206 long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
207
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218
219 if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
220 ++kvm->stat.remote_tlb_flush;
221 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
222}
223EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
224#endif
225
226void kvm_reload_remote_mmus(struct kvm *kvm)
227{
228 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
229}
230
231int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
232{
233 struct page *page;
234 int r;
235
236 mutex_init(&vcpu->mutex);
237 vcpu->cpu = -1;
238 vcpu->kvm = kvm;
239 vcpu->vcpu_id = id;
240 vcpu->pid = NULL;
241 init_swait_queue_head(&vcpu->wq);
242 kvm_async_pf_vcpu_init(vcpu);
243
244 vcpu->pre_pcpu = -1;
245 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
246
247 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
248 if (!page) {
249 r = -ENOMEM;
250 goto fail;
251 }
252 vcpu->run = page_address(page);
253
254 kvm_vcpu_set_in_spin_loop(vcpu, false);
255 kvm_vcpu_set_dy_eligible(vcpu, false);
256 vcpu->preempted = false;
257
258 r = kvm_arch_vcpu_init(vcpu);
259 if (r < 0)
260 goto fail_free_run;
261 return 0;
262
263fail_free_run:
264 free_page((unsigned long)vcpu->run);
265fail:
266 return r;
267}
268EXPORT_SYMBOL_GPL(kvm_vcpu_init);
269
270void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
271{
272 put_pid(vcpu->pid);
273 kvm_arch_vcpu_uninit(vcpu);
274 free_page((unsigned long)vcpu->run);
275}
276EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
277
278#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
279static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
280{
281 return container_of(mn, struct kvm, mmu_notifier);
282}
283
284static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
285 struct mm_struct *mm,
286 unsigned long address)
287{
288 struct kvm *kvm = mmu_notifier_to_kvm(mn);
289 int need_tlb_flush, idx;
290
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309 idx = srcu_read_lock(&kvm->srcu);
310 spin_lock(&kvm->mmu_lock);
311
312 kvm->mmu_notifier_seq++;
313 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
314
315 if (need_tlb_flush)
316 kvm_flush_remote_tlbs(kvm);
317
318 spin_unlock(&kvm->mmu_lock);
319
320 kvm_arch_mmu_notifier_invalidate_page(kvm, address);
321
322 srcu_read_unlock(&kvm->srcu, idx);
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
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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_page = kvm_mmu_notifier_invalidate_page,
473 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
474 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
475 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
476 .clear_young = kvm_mmu_notifier_clear_young,
477 .test_young = kvm_mmu_notifier_test_young,
478 .change_pte = kvm_mmu_notifier_change_pte,
479 .release = kvm_mmu_notifier_release,
480};
481
482static int kvm_init_mmu_notifier(struct kvm *kvm)
483{
484 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
485 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
486}
487
488#else
489
490static int kvm_init_mmu_notifier(struct kvm *kvm)
491{
492 return 0;
493}
494
495#endif
496
497static struct kvm_memslots *kvm_alloc_memslots(void)
498{
499 int i;
500 struct kvm_memslots *slots;
501
502 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
503 if (!slots)
504 return NULL;
505
506
507
508
509
510 slots->generation = -150;
511 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
512 slots->id_to_index[i] = slots->memslots[i].id = i;
513
514 return slots;
515}
516
517static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
518{
519 if (!memslot->dirty_bitmap)
520 return;
521
522 kvfree(memslot->dirty_bitmap);
523 memslot->dirty_bitmap = NULL;
524}
525
526
527
528
529static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
530 struct kvm_memory_slot *dont)
531{
532 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
533 kvm_destroy_dirty_bitmap(free);
534
535 kvm_arch_free_memslot(kvm, free, dont);
536
537 free->npages = 0;
538}
539
540static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
541{
542 struct kvm_memory_slot *memslot;
543
544 if (!slots)
545 return;
546
547 kvm_for_each_memslot(memslot, slots)
548 kvm_free_memslot(kvm, memslot, NULL);
549
550 kvfree(slots);
551}
552
553static void kvm_destroy_vm_debugfs(struct kvm *kvm)
554{
555 int i;
556
557 if (!kvm->debugfs_dentry)
558 return;
559
560 debugfs_remove_recursive(kvm->debugfs_dentry);
561
562 if (kvm->debugfs_stat_data) {
563 for (i = 0; i < kvm_debugfs_num_entries; i++)
564 kfree(kvm->debugfs_stat_data[i]);
565 kfree(kvm->debugfs_stat_data);
566 }
567}
568
569static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
570{
571 char dir_name[ITOA_MAX_LEN * 2];
572 struct kvm_stat_data *stat_data;
573 struct kvm_stats_debugfs_item *p;
574
575 if (!debugfs_initialized())
576 return 0;
577
578 snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
579 kvm->debugfs_dentry = debugfs_create_dir(dir_name,
580 kvm_debugfs_dir);
581 if (!kvm->debugfs_dentry)
582 return -ENOMEM;
583
584 kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
585 sizeof(*kvm->debugfs_stat_data),
586 GFP_KERNEL);
587 if (!kvm->debugfs_stat_data)
588 return -ENOMEM;
589
590 for (p = debugfs_entries; p->name; p++) {
591 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
592 if (!stat_data)
593 return -ENOMEM;
594
595 stat_data->kvm = kvm;
596 stat_data->offset = p->offset;
597 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
598 if (!debugfs_create_file(p->name, 0444,
599 kvm->debugfs_dentry,
600 stat_data,
601 stat_fops_per_vm[p->kind]))
602 return -ENOMEM;
603 }
604 return 0;
605}
606
607static struct kvm *kvm_create_vm(unsigned long type)
608{
609 int r, i;
610 struct kvm *kvm = kvm_arch_alloc_vm();
611
612 if (!kvm)
613 return ERR_PTR(-ENOMEM);
614
615 spin_lock_init(&kvm->mmu_lock);
616 atomic_inc(¤t->mm->mm_count);
617 kvm->mm = current->mm;
618 kvm_eventfd_init(kvm);
619 mutex_init(&kvm->lock);
620 mutex_init(&kvm->irq_lock);
621 mutex_init(&kvm->slots_lock);
622 atomic_set(&kvm->users_count, 1);
623 INIT_LIST_HEAD(&kvm->devices);
624
625 r = kvm_arch_init_vm(kvm, type);
626 if (r)
627 goto out_err_no_disable;
628
629 r = hardware_enable_all();
630 if (r)
631 goto out_err_no_disable;
632
633#ifdef CONFIG_HAVE_KVM_IRQFD
634 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
635#endif
636
637 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
638
639 r = -ENOMEM;
640 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
641 kvm->memslots[i] = kvm_alloc_memslots();
642 if (!kvm->memslots[i])
643 goto out_err_no_srcu;
644 }
645
646 if (init_srcu_struct(&kvm->srcu))
647 goto out_err_no_srcu;
648 if (init_srcu_struct(&kvm->irq_srcu))
649 goto out_err_no_irq_srcu;
650 for (i = 0; i < KVM_NR_BUSES; i++) {
651 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
652 GFP_KERNEL);
653 if (!kvm->buses[i])
654 goto out_err;
655 }
656
657 r = kvm_init_mmu_notifier(kvm);
658 if (r)
659 goto out_err;
660
661 spin_lock(&kvm_lock);
662 list_add(&kvm->vm_list, &vm_list);
663 spin_unlock(&kvm_lock);
664
665 preempt_notifier_inc();
666
667 return kvm;
668
669out_err:
670 cleanup_srcu_struct(&kvm->irq_srcu);
671out_err_no_irq_srcu:
672 cleanup_srcu_struct(&kvm->srcu);
673out_err_no_srcu:
674 hardware_disable_all();
675out_err_no_disable:
676 for (i = 0; i < KVM_NR_BUSES; i++)
677 kfree(kvm->buses[i]);
678 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
679 kvm_free_memslots(kvm, kvm->memslots[i]);
680 kvm_arch_free_vm(kvm);
681 mmdrop(current->mm);
682 return ERR_PTR(r);
683}
684
685
686
687
688
689void *kvm_kvzalloc(unsigned long size)
690{
691 if (size > PAGE_SIZE)
692 return vzalloc(size);
693 else
694 return kzalloc(size, GFP_KERNEL);
695}
696
697static void kvm_destroy_devices(struct kvm *kvm)
698{
699 struct kvm_device *dev, *tmp;
700
701
702
703
704
705
706 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
707 list_del(&dev->vm_node);
708 dev->ops->destroy(dev);
709 }
710}
711
712static void kvm_destroy_vm(struct kvm *kvm)
713{
714 int i;
715 struct mm_struct *mm = kvm->mm;
716
717 kvm_destroy_vm_debugfs(kvm);
718 kvm_arch_sync_events(kvm);
719 spin_lock(&kvm_lock);
720 list_del(&kvm->vm_list);
721 spin_unlock(&kvm_lock);
722 kvm_free_irq_routing(kvm);
723 for (i = 0; i < KVM_NR_BUSES; i++)
724 kvm_io_bus_destroy(kvm->buses[i]);
725 kvm_coalesced_mmio_free(kvm);
726#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
727 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
728#else
729 kvm_arch_flush_shadow_all(kvm);
730#endif
731 kvm_arch_destroy_vm(kvm);
732 kvm_destroy_devices(kvm);
733 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
734 kvm_free_memslots(kvm, kvm->memslots[i]);
735 cleanup_srcu_struct(&kvm->irq_srcu);
736 cleanup_srcu_struct(&kvm->srcu);
737 kvm_arch_free_vm(kvm);
738 preempt_notifier_dec();
739 hardware_disable_all();
740 mmdrop(mm);
741}
742
743void kvm_get_kvm(struct kvm *kvm)
744{
745 atomic_inc(&kvm->users_count);
746}
747EXPORT_SYMBOL_GPL(kvm_get_kvm);
748
749void kvm_put_kvm(struct kvm *kvm)
750{
751 if (atomic_dec_and_test(&kvm->users_count))
752 kvm_destroy_vm(kvm);
753}
754EXPORT_SYMBOL_GPL(kvm_put_kvm);
755
756
757static int kvm_vm_release(struct inode *inode, struct file *filp)
758{
759 struct kvm *kvm = filp->private_data;
760
761 kvm_irqfd_release(kvm);
762
763 kvm_put_kvm(kvm);
764 return 0;
765}
766
767
768
769
770
771static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
772{
773 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
774
775 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
776 if (!memslot->dirty_bitmap)
777 return -ENOMEM;
778
779 return 0;
780}
781
782
783
784
785
786
787
788static void update_memslots(struct kvm_memslots *slots,
789 struct kvm_memory_slot *new)
790{
791 int id = new->id;
792 int i = slots->id_to_index[id];
793 struct kvm_memory_slot *mslots = slots->memslots;
794
795 WARN_ON(mslots[i].id != id);
796 if (!new->npages) {
797 WARN_ON(!mslots[i].npages);
798 if (mslots[i].npages)
799 slots->used_slots--;
800 } else {
801 if (!mslots[i].npages)
802 slots->used_slots++;
803 }
804
805 while (i < KVM_MEM_SLOTS_NUM - 1 &&
806 new->base_gfn <= mslots[i + 1].base_gfn) {
807 if (!mslots[i + 1].npages)
808 break;
809 mslots[i] = mslots[i + 1];
810 slots->id_to_index[mslots[i].id] = i;
811 i++;
812 }
813
814
815
816
817
818
819
820
821
822
823 if (new->npages) {
824 while (i > 0 &&
825 new->base_gfn >= mslots[i - 1].base_gfn) {
826 mslots[i] = mslots[i - 1];
827 slots->id_to_index[mslots[i].id] = i;
828 i--;
829 }
830 } else
831 WARN_ON_ONCE(i != slots->used_slots);
832
833 mslots[i] = *new;
834 slots->id_to_index[mslots[i].id] = i;
835}
836
837static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
838{
839 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
840
841#ifdef __KVM_HAVE_READONLY_MEM
842 valid_flags |= KVM_MEM_READONLY;
843#endif
844
845 if (mem->flags & ~valid_flags)
846 return -EINVAL;
847
848 return 0;
849}
850
851static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
852 int as_id, struct kvm_memslots *slots)
853{
854 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
855
856
857
858
859
860 WARN_ON(old_memslots->generation & 1);
861 slots->generation = old_memslots->generation + 1;
862
863 rcu_assign_pointer(kvm->memslots[as_id], slots);
864 synchronize_srcu_expedited(&kvm->srcu);
865
866
867
868
869
870
871 slots->generation++;
872
873 kvm_arch_memslots_updated(kvm, slots);
874
875 return old_memslots;
876}
877
878
879
880
881
882
883
884
885
886int __kvm_set_memory_region(struct kvm *kvm,
887 const struct kvm_userspace_memory_region *mem)
888{
889 int r;
890 gfn_t base_gfn;
891 unsigned long npages;
892 struct kvm_memory_slot *slot;
893 struct kvm_memory_slot old, new;
894 struct kvm_memslots *slots = NULL, *old_memslots;
895 int as_id, id;
896 enum kvm_mr_change change;
897
898 r = check_memory_region_flags(mem);
899 if (r)
900 goto out;
901
902 r = -EINVAL;
903 as_id = mem->slot >> 16;
904 id = (u16)mem->slot;
905
906
907 if (mem->memory_size & (PAGE_SIZE - 1))
908 goto out;
909 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
910 goto out;
911
912 if ((id < KVM_USER_MEM_SLOTS) &&
913 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
914 !access_ok(VERIFY_WRITE,
915 (void __user *)(unsigned long)mem->userspace_addr,
916 mem->memory_size)))
917 goto out;
918 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
919 goto out;
920 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
921 goto out;
922
923 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
924 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
925 npages = mem->memory_size >> PAGE_SHIFT;
926
927 if (npages > KVM_MEM_MAX_NR_PAGES)
928 goto out;
929
930 new = old = *slot;
931
932 new.id = id;
933 new.base_gfn = base_gfn;
934 new.npages = npages;
935 new.flags = mem->flags;
936
937 if (npages) {
938 if (!old.npages)
939 change = KVM_MR_CREATE;
940 else {
941 if ((mem->userspace_addr != old.userspace_addr) ||
942 (npages != old.npages) ||
943 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
944 goto out;
945
946 if (base_gfn != old.base_gfn)
947 change = KVM_MR_MOVE;
948 else if (new.flags != old.flags)
949 change = KVM_MR_FLAGS_ONLY;
950 else {
951 r = 0;
952 goto out;
953 }
954 }
955 } else {
956 if (!old.npages)
957 goto out;
958
959 change = KVM_MR_DELETE;
960 new.base_gfn = 0;
961 new.flags = 0;
962 }
963
964 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
965
966 r = -EEXIST;
967 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
968 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
969 (slot->id == id))
970 continue;
971 if (!((base_gfn + npages <= slot->base_gfn) ||
972 (base_gfn >= slot->base_gfn + slot->npages)))
973 goto out;
974 }
975 }
976
977
978 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
979 new.dirty_bitmap = NULL;
980
981 r = -ENOMEM;
982 if (change == KVM_MR_CREATE) {
983 new.userspace_addr = mem->userspace_addr;
984
985 if (kvm_arch_create_memslot(kvm, &new, npages))
986 goto out_free;
987 }
988
989
990 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
991 if (kvm_create_dirty_bitmap(&new) < 0)
992 goto out_free;
993 }
994
995 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
996 if (!slots)
997 goto out_free;
998 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
999
1000 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
1001 slot = id_to_memslot(slots, id);
1002 slot->flags |= KVM_MEMSLOT_INVALID;
1003
1004 old_memslots = install_new_memslots(kvm, as_id, slots);
1005
1006
1007 kvm_iommu_unmap_pages(kvm, &old);
1008
1009
1010
1011
1012
1013
1014
1015 kvm_arch_flush_shadow_memslot(kvm, slot);
1016
1017
1018
1019
1020
1021
1022 slots = old_memslots;
1023 }
1024
1025 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1026 if (r)
1027 goto out_slots;
1028
1029
1030 if (change == KVM_MR_DELETE) {
1031 new.dirty_bitmap = NULL;
1032 memset(&new.arch, 0, sizeof(new.arch));
1033 }
1034
1035 update_memslots(slots, &new);
1036 old_memslots = install_new_memslots(kvm, as_id, slots);
1037
1038 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1039
1040 kvm_free_memslot(kvm, &old, &new);
1041 kvfree(old_memslots);
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
1053 r = kvm_iommu_map_pages(kvm, &new);
1054 return r;
1055 }
1056
1057 return 0;
1058
1059out_slots:
1060 kvfree(slots);
1061out_free:
1062 kvm_free_memslot(kvm, &new, &old);
1063out:
1064 return r;
1065}
1066EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1067
1068int kvm_set_memory_region(struct kvm *kvm,
1069 const struct kvm_userspace_memory_region *mem)
1070{
1071 int r;
1072
1073 mutex_lock(&kvm->slots_lock);
1074 r = __kvm_set_memory_region(kvm, mem);
1075 mutex_unlock(&kvm->slots_lock);
1076 return r;
1077}
1078EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1079
1080static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1081 struct kvm_userspace_memory_region *mem)
1082{
1083 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1084 return -EINVAL;
1085
1086 return kvm_set_memory_region(kvm, mem);
1087}
1088
1089int kvm_get_dirty_log(struct kvm *kvm,
1090 struct kvm_dirty_log *log, int *is_dirty)
1091{
1092 struct kvm_memslots *slots;
1093 struct kvm_memory_slot *memslot;
1094 int r, i, as_id, id;
1095 unsigned long n;
1096 unsigned long any = 0;
1097
1098 r = -EINVAL;
1099 as_id = log->slot >> 16;
1100 id = (u16)log->slot;
1101 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1102 goto out;
1103
1104 slots = __kvm_memslots(kvm, as_id);
1105 memslot = id_to_memslot(slots, id);
1106 r = -ENOENT;
1107 if (!memslot->dirty_bitmap)
1108 goto out;
1109
1110 n = kvm_dirty_bitmap_bytes(memslot);
1111
1112 for (i = 0; !any && i < n/sizeof(long); ++i)
1113 any = memslot->dirty_bitmap[i];
1114
1115 r = -EFAULT;
1116 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1117 goto out;
1118
1119 if (any)
1120 *is_dirty = 1;
1121
1122 r = 0;
1123out:
1124 return r;
1125}
1126EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1127
1128#ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151int kvm_get_dirty_log_protect(struct kvm *kvm,
1152 struct kvm_dirty_log *log, bool *is_dirty)
1153{
1154 struct kvm_memslots *slots;
1155 struct kvm_memory_slot *memslot;
1156 int r, i, as_id, id;
1157 unsigned long n;
1158 unsigned long *dirty_bitmap;
1159 unsigned long *dirty_bitmap_buffer;
1160
1161 r = -EINVAL;
1162 as_id = log->slot >> 16;
1163 id = (u16)log->slot;
1164 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1165 goto out;
1166
1167 slots = __kvm_memslots(kvm, as_id);
1168 memslot = id_to_memslot(slots, id);
1169
1170 dirty_bitmap = memslot->dirty_bitmap;
1171 r = -ENOENT;
1172 if (!dirty_bitmap)
1173 goto out;
1174
1175 n = kvm_dirty_bitmap_bytes(memslot);
1176
1177 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1178 memset(dirty_bitmap_buffer, 0, n);
1179
1180 spin_lock(&kvm->mmu_lock);
1181 *is_dirty = false;
1182 for (i = 0; i < n / sizeof(long); i++) {
1183 unsigned long mask;
1184 gfn_t offset;
1185
1186 if (!dirty_bitmap[i])
1187 continue;
1188
1189 *is_dirty = true;
1190
1191 mask = xchg(&dirty_bitmap[i], 0);
1192 dirty_bitmap_buffer[i] = mask;
1193
1194 if (mask) {
1195 offset = i * BITS_PER_LONG;
1196 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1197 offset, mask);
1198 }
1199 }
1200
1201 spin_unlock(&kvm->mmu_lock);
1202
1203 r = -EFAULT;
1204 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1205 goto out;
1206
1207 r = 0;
1208out:
1209 return r;
1210}
1211EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1212#endif
1213
1214bool kvm_largepages_enabled(void)
1215{
1216 return largepages_enabled;
1217}
1218
1219void kvm_disable_largepages(void)
1220{
1221 largepages_enabled = false;
1222}
1223EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1224
1225struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1226{
1227 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1228}
1229EXPORT_SYMBOL_GPL(gfn_to_memslot);
1230
1231struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1232{
1233 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1234}
1235
1236bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1237{
1238 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1239
1240 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1241 memslot->flags & KVM_MEMSLOT_INVALID)
1242 return false;
1243
1244 return true;
1245}
1246EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1247
1248unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1249{
1250 struct vm_area_struct *vma;
1251 unsigned long addr, size;
1252
1253 size = PAGE_SIZE;
1254
1255 addr = gfn_to_hva(kvm, gfn);
1256 if (kvm_is_error_hva(addr))
1257 return PAGE_SIZE;
1258
1259 down_read(¤t->mm->mmap_sem);
1260 vma = find_vma(current->mm, addr);
1261 if (!vma)
1262 goto out;
1263
1264 size = vma_kernel_pagesize(vma);
1265
1266out:
1267 up_read(¤t->mm->mmap_sem);
1268
1269 return size;
1270}
1271
1272static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1273{
1274 return slot->flags & KVM_MEM_READONLY;
1275}
1276
1277static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1278 gfn_t *nr_pages, bool write)
1279{
1280 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1281 return KVM_HVA_ERR_BAD;
1282
1283 if (memslot_is_readonly(slot) && write)
1284 return KVM_HVA_ERR_RO_BAD;
1285
1286 if (nr_pages)
1287 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1288
1289 return __gfn_to_hva_memslot(slot, gfn);
1290}
1291
1292static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1293 gfn_t *nr_pages)
1294{
1295 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1296}
1297
1298unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1299 gfn_t gfn)
1300{
1301 return gfn_to_hva_many(slot, gfn, NULL);
1302}
1303EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1304
1305unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1306{
1307 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1308}
1309EXPORT_SYMBOL_GPL(gfn_to_hva);
1310
1311unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1312{
1313 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1314}
1315EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1316
1317
1318
1319
1320
1321unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1322 gfn_t gfn, bool *writable)
1323{
1324 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1325
1326 if (!kvm_is_error_hva(hva) && writable)
1327 *writable = !memslot_is_readonly(slot);
1328
1329 return hva;
1330}
1331
1332unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1333{
1334 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1335
1336 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1337}
1338
1339unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1340{
1341 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1342
1343 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1344}
1345
1346static int get_user_page_nowait(unsigned long start, int write,
1347 struct page **page)
1348{
1349 int flags = FOLL_NOWAIT | FOLL_HWPOISON;
1350
1351 if (write)
1352 flags |= FOLL_WRITE;
1353
1354 return get_user_pages(start, 1, flags, page, NULL);
1355}
1356
1357static inline int check_user_page_hwpoison(unsigned long addr)
1358{
1359 int rc, flags = FOLL_HWPOISON | FOLL_WRITE;
1360
1361 rc = get_user_pages(addr, 1, flags, NULL, NULL);
1362 return rc == -EHWPOISON;
1363}
1364
1365
1366
1367
1368
1369static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1370 bool write_fault, bool *writable, kvm_pfn_t *pfn)
1371{
1372 struct page *page[1];
1373 int npages;
1374
1375 if (!(async || atomic))
1376 return false;
1377
1378
1379
1380
1381
1382
1383 if (!(write_fault || writable))
1384 return false;
1385
1386 npages = __get_user_pages_fast(addr, 1, 1, page);
1387 if (npages == 1) {
1388 *pfn = page_to_pfn(page[0]);
1389
1390 if (writable)
1391 *writable = true;
1392 return true;
1393 }
1394
1395 return false;
1396}
1397
1398
1399
1400
1401
1402static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1403 bool *writable, kvm_pfn_t *pfn)
1404{
1405 struct page *page[1];
1406 int npages = 0;
1407
1408 might_sleep();
1409
1410 if (writable)
1411 *writable = write_fault;
1412
1413 if (async) {
1414 down_read(¤t->mm->mmap_sem);
1415 npages = get_user_page_nowait(addr, write_fault, page);
1416 up_read(¤t->mm->mmap_sem);
1417 } else {
1418 unsigned int flags = FOLL_TOUCH | FOLL_HWPOISON;
1419
1420 if (write_fault)
1421 flags |= FOLL_WRITE;
1422
1423 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
1424 page, flags);
1425 }
1426 if (npages != 1)
1427 return npages;
1428
1429
1430 if (unlikely(!write_fault) && writable) {
1431 struct page *wpage[1];
1432
1433 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1434 if (npages == 1) {
1435 *writable = true;
1436 put_page(page[0]);
1437 page[0] = wpage[0];
1438 }
1439
1440 npages = 1;
1441 }
1442 *pfn = page_to_pfn(page[0]);
1443 return npages;
1444}
1445
1446static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1447{
1448 if (unlikely(!(vma->vm_flags & VM_READ)))
1449 return false;
1450
1451 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1452 return false;
1453
1454 return true;
1455}
1456
1457static int hva_to_pfn_remapped(struct vm_area_struct *vma,
1458 unsigned long addr, bool *async,
1459 bool write_fault, kvm_pfn_t *p_pfn)
1460{
1461 unsigned long pfn;
1462 int r;
1463
1464 r = follow_pfn(vma, addr, &pfn);
1465 if (r) {
1466
1467
1468
1469
1470 bool unlocked = false;
1471 r = fixup_user_fault(current, current->mm, addr,
1472 (write_fault ? FAULT_FLAG_WRITE : 0),
1473 &unlocked);
1474 if (unlocked)
1475 return -EAGAIN;
1476 if (r)
1477 return r;
1478
1479 r = follow_pfn(vma, addr, &pfn);
1480 if (r)
1481 return r;
1482
1483 }
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497 kvm_get_pfn(pfn);
1498
1499 *p_pfn = pfn;
1500 return 0;
1501}
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1518 bool write_fault, bool *writable)
1519{
1520 struct vm_area_struct *vma;
1521 kvm_pfn_t pfn = 0;
1522 int npages, r;
1523
1524
1525 BUG_ON(atomic && async);
1526
1527 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1528 return pfn;
1529
1530 if (atomic)
1531 return KVM_PFN_ERR_FAULT;
1532
1533 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1534 if (npages == 1)
1535 return pfn;
1536
1537 down_read(¤t->mm->mmap_sem);
1538 if (npages == -EHWPOISON ||
1539 (!async && check_user_page_hwpoison(addr))) {
1540 pfn = KVM_PFN_ERR_HWPOISON;
1541 goto exit;
1542 }
1543
1544retry:
1545 vma = find_vma_intersection(current->mm, addr, addr + 1);
1546
1547 if (vma == NULL)
1548 pfn = KVM_PFN_ERR_FAULT;
1549 else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
1550 r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn);
1551 if (r == -EAGAIN)
1552 goto retry;
1553 if (r < 0)
1554 pfn = KVM_PFN_ERR_FAULT;
1555 } else {
1556 if (async && vma_is_valid(vma, write_fault))
1557 *async = true;
1558 pfn = KVM_PFN_ERR_FAULT;
1559 }
1560exit:
1561 up_read(¤t->mm->mmap_sem);
1562 return pfn;
1563}
1564
1565kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1566 bool atomic, bool *async, bool write_fault,
1567 bool *writable)
1568{
1569 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1570
1571 if (addr == KVM_HVA_ERR_RO_BAD) {
1572 if (writable)
1573 *writable = false;
1574 return KVM_PFN_ERR_RO_FAULT;
1575 }
1576
1577 if (kvm_is_error_hva(addr)) {
1578 if (writable)
1579 *writable = false;
1580 return KVM_PFN_NOSLOT;
1581 }
1582
1583
1584 if (writable && memslot_is_readonly(slot)) {
1585 *writable = false;
1586 writable = NULL;
1587 }
1588
1589 return hva_to_pfn(addr, atomic, async, write_fault,
1590 writable);
1591}
1592EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1593
1594kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1595 bool *writable)
1596{
1597 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1598 write_fault, writable);
1599}
1600EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1601
1602kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1603{
1604 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1605}
1606EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1607
1608kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1609{
1610 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1611}
1612EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1613
1614kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1615{
1616 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1617}
1618EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1619
1620kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1621{
1622 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1623}
1624EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1625
1626kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1627{
1628 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1629}
1630EXPORT_SYMBOL_GPL(gfn_to_pfn);
1631
1632kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1633{
1634 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1635}
1636EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1637
1638int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1639 struct page **pages, int nr_pages)
1640{
1641 unsigned long addr;
1642 gfn_t entry;
1643
1644 addr = gfn_to_hva_many(slot, gfn, &entry);
1645 if (kvm_is_error_hva(addr))
1646 return -1;
1647
1648 if (entry < nr_pages)
1649 return 0;
1650
1651 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1652}
1653EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1654
1655static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1656{
1657 if (is_error_noslot_pfn(pfn))
1658 return KVM_ERR_PTR_BAD_PAGE;
1659
1660 if (kvm_is_reserved_pfn(pfn)) {
1661 WARN_ON(1);
1662 return KVM_ERR_PTR_BAD_PAGE;
1663 }
1664
1665 return pfn_to_page(pfn);
1666}
1667
1668struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1669{
1670 kvm_pfn_t pfn;
1671
1672 pfn = gfn_to_pfn(kvm, gfn);
1673
1674 return kvm_pfn_to_page(pfn);
1675}
1676EXPORT_SYMBOL_GPL(gfn_to_page);
1677
1678struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1679{
1680 kvm_pfn_t pfn;
1681
1682 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1683
1684 return kvm_pfn_to_page(pfn);
1685}
1686EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1687
1688void kvm_release_page_clean(struct page *page)
1689{
1690 WARN_ON(is_error_page(page));
1691
1692 kvm_release_pfn_clean(page_to_pfn(page));
1693}
1694EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1695
1696void kvm_release_pfn_clean(kvm_pfn_t pfn)
1697{
1698 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1699 put_page(pfn_to_page(pfn));
1700}
1701EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1702
1703void kvm_release_page_dirty(struct page *page)
1704{
1705 WARN_ON(is_error_page(page));
1706
1707 kvm_release_pfn_dirty(page_to_pfn(page));
1708}
1709EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1710
1711static void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1712{
1713 kvm_set_pfn_dirty(pfn);
1714 kvm_release_pfn_clean(pfn);
1715}
1716
1717void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1718{
1719 if (!kvm_is_reserved_pfn(pfn)) {
1720 struct page *page = pfn_to_page(pfn);
1721
1722 if (!PageReserved(page))
1723 SetPageDirty(page);
1724 }
1725}
1726EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1727
1728void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1729{
1730 if (!kvm_is_reserved_pfn(pfn))
1731 mark_page_accessed(pfn_to_page(pfn));
1732}
1733EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1734
1735void kvm_get_pfn(kvm_pfn_t pfn)
1736{
1737 if (!kvm_is_reserved_pfn(pfn))
1738 get_page(pfn_to_page(pfn));
1739}
1740EXPORT_SYMBOL_GPL(kvm_get_pfn);
1741
1742static int next_segment(unsigned long len, int offset)
1743{
1744 if (len > PAGE_SIZE - offset)
1745 return PAGE_SIZE - offset;
1746 else
1747 return len;
1748}
1749
1750static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1751 void *data, int offset, int len)
1752{
1753 int r;
1754 unsigned long addr;
1755
1756 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1757 if (kvm_is_error_hva(addr))
1758 return -EFAULT;
1759 r = __copy_from_user(data, (void __user *)addr + offset, len);
1760 if (r)
1761 return -EFAULT;
1762 return 0;
1763}
1764
1765int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1766 int len)
1767{
1768 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1769
1770 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1771}
1772EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1773
1774int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1775 int offset, int len)
1776{
1777 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1778
1779 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1780}
1781EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1782
1783int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1784{
1785 gfn_t gfn = gpa >> PAGE_SHIFT;
1786 int seg;
1787 int offset = offset_in_page(gpa);
1788 int ret;
1789
1790 while ((seg = next_segment(len, offset)) != 0) {
1791 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1792 if (ret < 0)
1793 return ret;
1794 offset = 0;
1795 len -= seg;
1796 data += seg;
1797 ++gfn;
1798 }
1799 return 0;
1800}
1801EXPORT_SYMBOL_GPL(kvm_read_guest);
1802
1803int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1804{
1805 gfn_t gfn = gpa >> PAGE_SHIFT;
1806 int seg;
1807 int offset = offset_in_page(gpa);
1808 int ret;
1809
1810 while ((seg = next_segment(len, offset)) != 0) {
1811 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1812 if (ret < 0)
1813 return ret;
1814 offset = 0;
1815 len -= seg;
1816 data += seg;
1817 ++gfn;
1818 }
1819 return 0;
1820}
1821EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1822
1823static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1824 void *data, int offset, unsigned long len)
1825{
1826 int r;
1827 unsigned long addr;
1828
1829 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1830 if (kvm_is_error_hva(addr))
1831 return -EFAULT;
1832 pagefault_disable();
1833 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1834 pagefault_enable();
1835 if (r)
1836 return -EFAULT;
1837 return 0;
1838}
1839
1840int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1841 unsigned long len)
1842{
1843 gfn_t gfn = gpa >> PAGE_SHIFT;
1844 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1845 int offset = offset_in_page(gpa);
1846
1847 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1848}
1849EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1850
1851int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1852 void *data, unsigned long len)
1853{
1854 gfn_t gfn = gpa >> PAGE_SHIFT;
1855 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1856 int offset = offset_in_page(gpa);
1857
1858 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1859}
1860EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1861
1862static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1863 const void *data, int offset, int len)
1864{
1865 int r;
1866 unsigned long addr;
1867
1868 addr = gfn_to_hva_memslot(memslot, gfn);
1869 if (kvm_is_error_hva(addr))
1870 return -EFAULT;
1871 r = __copy_to_user((void __user *)addr + offset, data, len);
1872 if (r)
1873 return -EFAULT;
1874 mark_page_dirty_in_slot(memslot, gfn);
1875 return 0;
1876}
1877
1878int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1879 const void *data, int offset, int len)
1880{
1881 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1882
1883 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1884}
1885EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1886
1887int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1888 const void *data, int offset, int len)
1889{
1890 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1891
1892 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1893}
1894EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1895
1896int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1897 unsigned long len)
1898{
1899 gfn_t gfn = gpa >> PAGE_SHIFT;
1900 int seg;
1901 int offset = offset_in_page(gpa);
1902 int ret;
1903
1904 while ((seg = next_segment(len, offset)) != 0) {
1905 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1906 if (ret < 0)
1907 return ret;
1908 offset = 0;
1909 len -= seg;
1910 data += seg;
1911 ++gfn;
1912 }
1913 return 0;
1914}
1915EXPORT_SYMBOL_GPL(kvm_write_guest);
1916
1917int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1918 unsigned long len)
1919{
1920 gfn_t gfn = gpa >> PAGE_SHIFT;
1921 int seg;
1922 int offset = offset_in_page(gpa);
1923 int ret;
1924
1925 while ((seg = next_segment(len, offset)) != 0) {
1926 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1927 if (ret < 0)
1928 return ret;
1929 offset = 0;
1930 len -= seg;
1931 data += seg;
1932 ++gfn;
1933 }
1934 return 0;
1935}
1936EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1937
1938int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1939 gpa_t gpa, unsigned long len)
1940{
1941 struct kvm_memslots *slots = kvm_memslots(kvm);
1942 int offset = offset_in_page(gpa);
1943 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1944 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1945 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1946 gfn_t nr_pages_avail;
1947
1948 ghc->gpa = gpa;
1949 ghc->generation = slots->generation;
1950 ghc->len = len;
1951 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1952 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1953 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1954 ghc->hva += offset;
1955 } else {
1956
1957
1958
1959
1960 while (start_gfn <= end_gfn) {
1961 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1962 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1963 &nr_pages_avail);
1964 if (kvm_is_error_hva(ghc->hva))
1965 return -EFAULT;
1966 start_gfn += nr_pages_avail;
1967 }
1968
1969 ghc->memslot = NULL;
1970 }
1971 return 0;
1972}
1973EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1974
1975int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1976 void *data, unsigned long len)
1977{
1978 struct kvm_memslots *slots = kvm_memslots(kvm);
1979 int r;
1980
1981 BUG_ON(len > ghc->len);
1982
1983 if (slots->generation != ghc->generation)
1984 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1985
1986 if (unlikely(!ghc->memslot))
1987 return kvm_write_guest(kvm, ghc->gpa, data, len);
1988
1989 if (kvm_is_error_hva(ghc->hva))
1990 return -EFAULT;
1991
1992 r = __copy_to_user((void __user *)ghc->hva, data, len);
1993 if (r)
1994 return -EFAULT;
1995 mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1996
1997 return 0;
1998}
1999EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
2000
2001int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
2002 void *data, unsigned long len)
2003{
2004 struct kvm_memslots *slots = kvm_memslots(kvm);
2005 int r;
2006
2007 BUG_ON(len > ghc->len);
2008
2009 if (slots->generation != ghc->generation)
2010 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
2011
2012 if (unlikely(!ghc->memslot))
2013 return kvm_read_guest(kvm, ghc->gpa, data, len);
2014
2015 if (kvm_is_error_hva(ghc->hva))
2016 return -EFAULT;
2017
2018 r = __copy_from_user(data, (void __user *)ghc->hva, len);
2019 if (r)
2020 return -EFAULT;
2021
2022 return 0;
2023}
2024EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
2025
2026int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
2027{
2028 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2029
2030 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
2031}
2032EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
2033
2034int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
2035{
2036 gfn_t gfn = gpa >> PAGE_SHIFT;
2037 int seg;
2038 int offset = offset_in_page(gpa);
2039 int ret;
2040
2041 while ((seg = next_segment(len, offset)) != 0) {
2042 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
2043 if (ret < 0)
2044 return ret;
2045 offset = 0;
2046 len -= seg;
2047 ++gfn;
2048 }
2049 return 0;
2050}
2051EXPORT_SYMBOL_GPL(kvm_clear_guest);
2052
2053static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
2054 gfn_t gfn)
2055{
2056 if (memslot && memslot->dirty_bitmap) {
2057 unsigned long rel_gfn = gfn - memslot->base_gfn;
2058
2059 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2060 }
2061}
2062
2063void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2064{
2065 struct kvm_memory_slot *memslot;
2066
2067 memslot = gfn_to_memslot(kvm, gfn);
2068 mark_page_dirty_in_slot(memslot, gfn);
2069}
2070EXPORT_SYMBOL_GPL(mark_page_dirty);
2071
2072void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2073{
2074 struct kvm_memory_slot *memslot;
2075
2076 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2077 mark_page_dirty_in_slot(memslot, gfn);
2078}
2079EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2080
2081static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2082{
2083 unsigned int old, val, grow;
2084
2085 old = val = vcpu->halt_poll_ns;
2086 grow = READ_ONCE(halt_poll_ns_grow);
2087
2088 if (val == 0 && grow)
2089 val = 10000;
2090 else
2091 val *= grow;
2092
2093 if (val > halt_poll_ns)
2094 val = halt_poll_ns;
2095
2096 vcpu->halt_poll_ns = val;
2097 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2098}
2099
2100static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2101{
2102 unsigned int old, val, shrink;
2103
2104 old = val = vcpu->halt_poll_ns;
2105 shrink = READ_ONCE(halt_poll_ns_shrink);
2106 if (shrink == 0)
2107 val = 0;
2108 else
2109 val /= shrink;
2110
2111 vcpu->halt_poll_ns = val;
2112 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2113}
2114
2115static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2116{
2117 if (kvm_arch_vcpu_runnable(vcpu)) {
2118 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2119 return -EINTR;
2120 }
2121 if (kvm_cpu_has_pending_timer(vcpu))
2122 return -EINTR;
2123 if (signal_pending(current))
2124 return -EINTR;
2125
2126 return 0;
2127}
2128
2129
2130
2131
2132void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2133{
2134 ktime_t start, cur;
2135 DECLARE_SWAITQUEUE(wait);
2136 bool waited = false;
2137 u64 block_ns;
2138
2139 start = cur = ktime_get();
2140 if (vcpu->halt_poll_ns) {
2141 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2142
2143 ++vcpu->stat.halt_attempted_poll;
2144 do {
2145
2146
2147
2148
2149 if (kvm_vcpu_check_block(vcpu) < 0) {
2150 ++vcpu->stat.halt_successful_poll;
2151 if (!vcpu_valid_wakeup(vcpu))
2152 ++vcpu->stat.halt_poll_invalid;
2153 goto out;
2154 }
2155 cur = ktime_get();
2156 } while (single_task_running() && ktime_before(cur, stop));
2157 }
2158
2159 kvm_arch_vcpu_blocking(vcpu);
2160
2161 for (;;) {
2162 prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2163
2164 if (kvm_vcpu_check_block(vcpu) < 0)
2165 break;
2166
2167 waited = true;
2168 schedule();
2169 }
2170
2171 finish_swait(&vcpu->wq, &wait);
2172 cur = ktime_get();
2173
2174 kvm_arch_vcpu_unblocking(vcpu);
2175out:
2176 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2177
2178 if (!vcpu_valid_wakeup(vcpu))
2179 shrink_halt_poll_ns(vcpu);
2180 else if (halt_poll_ns) {
2181 if (block_ns <= vcpu->halt_poll_ns)
2182 ;
2183
2184 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2185 shrink_halt_poll_ns(vcpu);
2186
2187 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2188 block_ns < halt_poll_ns)
2189 grow_halt_poll_ns(vcpu);
2190 } else
2191 vcpu->halt_poll_ns = 0;
2192
2193 trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2194 kvm_arch_vcpu_block_finish(vcpu);
2195}
2196EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2197
2198#ifndef CONFIG_S390
2199void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2200{
2201 struct swait_queue_head *wqp;
2202
2203 wqp = kvm_arch_vcpu_wq(vcpu);
2204 if (swait_active(wqp)) {
2205 swake_up(wqp);
2206 ++vcpu->stat.halt_wakeup;
2207 }
2208
2209}
2210EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2211
2212
2213
2214
2215void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2216{
2217 int me;
2218 int cpu = vcpu->cpu;
2219
2220 kvm_vcpu_wake_up(vcpu);
2221 me = get_cpu();
2222 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2223 if (kvm_arch_vcpu_should_kick(vcpu))
2224 smp_send_reschedule(cpu);
2225 put_cpu();
2226}
2227EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2228#endif
2229
2230int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2231{
2232 struct pid *pid;
2233 struct task_struct *task = NULL;
2234 int ret = 0;
2235
2236 rcu_read_lock();
2237 pid = rcu_dereference(target->pid);
2238 if (pid)
2239 task = get_pid_task(pid, PIDTYPE_PID);
2240 rcu_read_unlock();
2241 if (!task)
2242 return ret;
2243 ret = yield_to(task, 1);
2244 put_task_struct(task);
2245
2246 return ret;
2247}
2248EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2273{
2274#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2275 bool eligible;
2276
2277 eligible = !vcpu->spin_loop.in_spin_loop ||
2278 vcpu->spin_loop.dy_eligible;
2279
2280 if (vcpu->spin_loop.in_spin_loop)
2281 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2282
2283 return eligible;
2284#else
2285 return true;
2286#endif
2287}
2288
2289void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2290{
2291 struct kvm *kvm = me->kvm;
2292 struct kvm_vcpu *vcpu;
2293 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2294 int yielded = 0;
2295 int try = 3;
2296 int pass;
2297 int i;
2298
2299 kvm_vcpu_set_in_spin_loop(me, true);
2300
2301
2302
2303
2304
2305
2306
2307 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2308 kvm_for_each_vcpu(i, vcpu, kvm) {
2309 if (!pass && i <= last_boosted_vcpu) {
2310 i = last_boosted_vcpu;
2311 continue;
2312 } else if (pass && i > last_boosted_vcpu)
2313 break;
2314 if (!ACCESS_ONCE(vcpu->preempted))
2315 continue;
2316 if (vcpu == me)
2317 continue;
2318 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2319 continue;
2320 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2321 continue;
2322
2323 yielded = kvm_vcpu_yield_to(vcpu);
2324 if (yielded > 0) {
2325 kvm->last_boosted_vcpu = i;
2326 break;
2327 } else if (yielded < 0) {
2328 try--;
2329 if (!try)
2330 break;
2331 }
2332 }
2333 }
2334 kvm_vcpu_set_in_spin_loop(me, false);
2335
2336
2337 kvm_vcpu_set_dy_eligible(me, false);
2338}
2339EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2340
2341static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2342{
2343 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2344 struct page *page;
2345
2346 if (vmf->pgoff == 0)
2347 page = virt_to_page(vcpu->run);
2348#ifdef CONFIG_X86
2349 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2350 page = virt_to_page(vcpu->arch.pio_data);
2351#endif
2352#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2353 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2354 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2355#endif
2356 else
2357 return kvm_arch_vcpu_fault(vcpu, vmf);
2358 get_page(page);
2359 vmf->page = page;
2360 return 0;
2361}
2362
2363static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2364 .fault = kvm_vcpu_fault,
2365};
2366
2367static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2368{
2369 vma->vm_ops = &kvm_vcpu_vm_ops;
2370 return 0;
2371}
2372
2373static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2374{
2375 struct kvm_vcpu *vcpu = filp->private_data;
2376
2377 debugfs_remove_recursive(vcpu->debugfs_dentry);
2378 kvm_put_kvm(vcpu->kvm);
2379 return 0;
2380}
2381
2382static struct file_operations kvm_vcpu_fops = {
2383 .release = kvm_vcpu_release,
2384 .unlocked_ioctl = kvm_vcpu_ioctl,
2385#ifdef CONFIG_KVM_COMPAT
2386 .compat_ioctl = kvm_vcpu_compat_ioctl,
2387#endif
2388 .mmap = kvm_vcpu_mmap,
2389 .llseek = noop_llseek,
2390};
2391
2392
2393
2394
2395static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2396{
2397 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2398}
2399
2400static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
2401{
2402 char dir_name[ITOA_MAX_LEN * 2];
2403 int ret;
2404
2405 if (!kvm_arch_has_vcpu_debugfs())
2406 return 0;
2407
2408 if (!debugfs_initialized())
2409 return 0;
2410
2411 snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
2412 vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
2413 vcpu->kvm->debugfs_dentry);
2414 if (!vcpu->debugfs_dentry)
2415 return -ENOMEM;
2416
2417 ret = kvm_arch_create_vcpu_debugfs(vcpu);
2418 if (ret < 0) {
2419 debugfs_remove_recursive(vcpu->debugfs_dentry);
2420 return ret;
2421 }
2422
2423 return 0;
2424}
2425
2426
2427
2428
2429static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2430{
2431 int r;
2432 struct kvm_vcpu *vcpu;
2433
2434 if (id >= KVM_MAX_VCPU_ID)
2435 return -EINVAL;
2436
2437 mutex_lock(&kvm->lock);
2438 if (kvm->created_vcpus == KVM_MAX_VCPUS) {
2439 mutex_unlock(&kvm->lock);
2440 return -EINVAL;
2441 }
2442
2443 kvm->created_vcpus++;
2444 mutex_unlock(&kvm->lock);
2445
2446 vcpu = kvm_arch_vcpu_create(kvm, id);
2447 if (IS_ERR(vcpu)) {
2448 r = PTR_ERR(vcpu);
2449 goto vcpu_decrement;
2450 }
2451
2452 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2453
2454 r = kvm_arch_vcpu_setup(vcpu);
2455 if (r)
2456 goto vcpu_destroy;
2457
2458 r = kvm_create_vcpu_debugfs(vcpu);
2459 if (r)
2460 goto vcpu_destroy;
2461
2462 mutex_lock(&kvm->lock);
2463 if (kvm_get_vcpu_by_id(kvm, id)) {
2464 r = -EEXIST;
2465 goto unlock_vcpu_destroy;
2466 }
2467
2468 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2469
2470
2471 kvm_get_kvm(kvm);
2472 r = create_vcpu_fd(vcpu);
2473 if (r < 0) {
2474 kvm_put_kvm(kvm);
2475 goto unlock_vcpu_destroy;
2476 }
2477
2478 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2479
2480
2481
2482
2483
2484 smp_wmb();
2485 atomic_inc(&kvm->online_vcpus);
2486
2487 mutex_unlock(&kvm->lock);
2488 kvm_arch_vcpu_postcreate(vcpu);
2489 return r;
2490
2491unlock_vcpu_destroy:
2492 mutex_unlock(&kvm->lock);
2493 debugfs_remove_recursive(vcpu->debugfs_dentry);
2494vcpu_destroy:
2495 kvm_arch_vcpu_destroy(vcpu);
2496vcpu_decrement:
2497 mutex_lock(&kvm->lock);
2498 kvm->created_vcpus--;
2499 mutex_unlock(&kvm->lock);
2500 return r;
2501}
2502
2503static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2504{
2505 if (sigset) {
2506 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2507 vcpu->sigset_active = 1;
2508 vcpu->sigset = *sigset;
2509 } else
2510 vcpu->sigset_active = 0;
2511 return 0;
2512}
2513
2514static long kvm_vcpu_ioctl(struct file *filp,
2515 unsigned int ioctl, unsigned long arg)
2516{
2517 struct kvm_vcpu *vcpu = filp->private_data;
2518 void __user *argp = (void __user *)arg;
2519 int r;
2520 struct kvm_fpu *fpu = NULL;
2521 struct kvm_sregs *kvm_sregs = NULL;
2522
2523 if (vcpu->kvm->mm != current->mm)
2524 return -EIO;
2525
2526 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2527 return -EINVAL;
2528
2529#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2530
2531
2532
2533
2534 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2535 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2536#endif
2537
2538
2539 r = vcpu_load(vcpu);
2540 if (r)
2541 return r;
2542 switch (ioctl) {
2543 case KVM_RUN:
2544 r = -EINVAL;
2545 if (arg)
2546 goto out;
2547 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
2548
2549 struct pid *oldpid = vcpu->pid;
2550 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2551
2552 rcu_assign_pointer(vcpu->pid, newpid);
2553 if (oldpid)
2554 synchronize_rcu();
2555 put_pid(oldpid);
2556 }
2557 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2558 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2559 break;
2560 case KVM_GET_REGS: {
2561 struct kvm_regs *kvm_regs;
2562
2563 r = -ENOMEM;
2564 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2565 if (!kvm_regs)
2566 goto out;
2567 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2568 if (r)
2569 goto out_free1;
2570 r = -EFAULT;
2571 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2572 goto out_free1;
2573 r = 0;
2574out_free1:
2575 kfree(kvm_regs);
2576 break;
2577 }
2578 case KVM_SET_REGS: {
2579 struct kvm_regs *kvm_regs;
2580
2581 r = -ENOMEM;
2582 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2583 if (IS_ERR(kvm_regs)) {
2584 r = PTR_ERR(kvm_regs);
2585 goto out;
2586 }
2587 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2588 kfree(kvm_regs);
2589 break;
2590 }
2591 case KVM_GET_SREGS: {
2592 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2593 r = -ENOMEM;
2594 if (!kvm_sregs)
2595 goto out;
2596 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2597 if (r)
2598 goto out;
2599 r = -EFAULT;
2600 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2601 goto out;
2602 r = 0;
2603 break;
2604 }
2605 case KVM_SET_SREGS: {
2606 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2607 if (IS_ERR(kvm_sregs)) {
2608 r = PTR_ERR(kvm_sregs);
2609 kvm_sregs = NULL;
2610 goto out;
2611 }
2612 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2613 break;
2614 }
2615 case KVM_GET_MP_STATE: {
2616 struct kvm_mp_state mp_state;
2617
2618 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2619 if (r)
2620 goto out;
2621 r = -EFAULT;
2622 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2623 goto out;
2624 r = 0;
2625 break;
2626 }
2627 case KVM_SET_MP_STATE: {
2628 struct kvm_mp_state mp_state;
2629
2630 r = -EFAULT;
2631 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2632 goto out;
2633 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2634 break;
2635 }
2636 case KVM_TRANSLATE: {
2637 struct kvm_translation tr;
2638
2639 r = -EFAULT;
2640 if (copy_from_user(&tr, argp, sizeof(tr)))
2641 goto out;
2642 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2643 if (r)
2644 goto out;
2645 r = -EFAULT;
2646 if (copy_to_user(argp, &tr, sizeof(tr)))
2647 goto out;
2648 r = 0;
2649 break;
2650 }
2651 case KVM_SET_GUEST_DEBUG: {
2652 struct kvm_guest_debug dbg;
2653
2654 r = -EFAULT;
2655 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2656 goto out;
2657 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2658 break;
2659 }
2660 case KVM_SET_SIGNAL_MASK: {
2661 struct kvm_signal_mask __user *sigmask_arg = argp;
2662 struct kvm_signal_mask kvm_sigmask;
2663 sigset_t sigset, *p;
2664
2665 p = NULL;
2666 if (argp) {
2667 r = -EFAULT;
2668 if (copy_from_user(&kvm_sigmask, argp,
2669 sizeof(kvm_sigmask)))
2670 goto out;
2671 r = -EINVAL;
2672 if (kvm_sigmask.len != sizeof(sigset))
2673 goto out;
2674 r = -EFAULT;
2675 if (copy_from_user(&sigset, sigmask_arg->sigset,
2676 sizeof(sigset)))
2677 goto out;
2678 p = &sigset;
2679 }
2680 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2681 break;
2682 }
2683 case KVM_GET_FPU: {
2684 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2685 r = -ENOMEM;
2686 if (!fpu)
2687 goto out;
2688 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2689 if (r)
2690 goto out;
2691 r = -EFAULT;
2692 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2693 goto out;
2694 r = 0;
2695 break;
2696 }
2697 case KVM_SET_FPU: {
2698 fpu = memdup_user(argp, sizeof(*fpu));
2699 if (IS_ERR(fpu)) {
2700 r = PTR_ERR(fpu);
2701 fpu = NULL;
2702 goto out;
2703 }
2704 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2705 break;
2706 }
2707 default:
2708 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2709 }
2710out:
2711 vcpu_put(vcpu);
2712 kfree(fpu);
2713 kfree(kvm_sregs);
2714 return r;
2715}
2716
2717#ifdef CONFIG_KVM_COMPAT
2718static long kvm_vcpu_compat_ioctl(struct file *filp,
2719 unsigned int ioctl, unsigned long arg)
2720{
2721 struct kvm_vcpu *vcpu = filp->private_data;
2722 void __user *argp = compat_ptr(arg);
2723 int r;
2724
2725 if (vcpu->kvm->mm != current->mm)
2726 return -EIO;
2727
2728 switch (ioctl) {
2729 case KVM_SET_SIGNAL_MASK: {
2730 struct kvm_signal_mask __user *sigmask_arg = argp;
2731 struct kvm_signal_mask kvm_sigmask;
2732 compat_sigset_t csigset;
2733 sigset_t sigset;
2734
2735 if (argp) {
2736 r = -EFAULT;
2737 if (copy_from_user(&kvm_sigmask, argp,
2738 sizeof(kvm_sigmask)))
2739 goto out;
2740 r = -EINVAL;
2741 if (kvm_sigmask.len != sizeof(csigset))
2742 goto out;
2743 r = -EFAULT;
2744 if (copy_from_user(&csigset, sigmask_arg->sigset,
2745 sizeof(csigset)))
2746 goto out;
2747 sigset_from_compat(&sigset, &csigset);
2748 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2749 } else
2750 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2751 break;
2752 }
2753 default:
2754 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2755 }
2756
2757out:
2758 return r;
2759}
2760#endif
2761
2762static int kvm_device_ioctl_attr(struct kvm_device *dev,
2763 int (*accessor)(struct kvm_device *dev,
2764 struct kvm_device_attr *attr),
2765 unsigned long arg)
2766{
2767 struct kvm_device_attr attr;
2768
2769 if (!accessor)
2770 return -EPERM;
2771
2772 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2773 return -EFAULT;
2774
2775 return accessor(dev, &attr);
2776}
2777
2778static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2779 unsigned long arg)
2780{
2781 struct kvm_device *dev = filp->private_data;
2782
2783 switch (ioctl) {
2784 case KVM_SET_DEVICE_ATTR:
2785 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2786 case KVM_GET_DEVICE_ATTR:
2787 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2788 case KVM_HAS_DEVICE_ATTR:
2789 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2790 default:
2791 if (dev->ops->ioctl)
2792 return dev->ops->ioctl(dev, ioctl, arg);
2793
2794 return -ENOTTY;
2795 }
2796}
2797
2798static int kvm_device_release(struct inode *inode, struct file *filp)
2799{
2800 struct kvm_device *dev = filp->private_data;
2801 struct kvm *kvm = dev->kvm;
2802
2803 kvm_put_kvm(kvm);
2804 return 0;
2805}
2806
2807static const struct file_operations kvm_device_fops = {
2808 .unlocked_ioctl = kvm_device_ioctl,
2809#ifdef CONFIG_KVM_COMPAT
2810 .compat_ioctl = kvm_device_ioctl,
2811#endif
2812 .release = kvm_device_release,
2813};
2814
2815struct kvm_device *kvm_device_from_filp(struct file *filp)
2816{
2817 if (filp->f_op != &kvm_device_fops)
2818 return NULL;
2819
2820 return filp->private_data;
2821}
2822
2823static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2824#ifdef CONFIG_KVM_MPIC
2825 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2826 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2827#endif
2828
2829#ifdef CONFIG_KVM_XICS
2830 [KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
2831#endif
2832};
2833
2834int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2835{
2836 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2837 return -ENOSPC;
2838
2839 if (kvm_device_ops_table[type] != NULL)
2840 return -EEXIST;
2841
2842 kvm_device_ops_table[type] = ops;
2843 return 0;
2844}
2845
2846void kvm_unregister_device_ops(u32 type)
2847{
2848 if (kvm_device_ops_table[type] != NULL)
2849 kvm_device_ops_table[type] = NULL;
2850}
2851
2852static int kvm_ioctl_create_device(struct kvm *kvm,
2853 struct kvm_create_device *cd)
2854{
2855 struct kvm_device_ops *ops = NULL;
2856 struct kvm_device *dev;
2857 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2858 int ret;
2859
2860 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2861 return -ENODEV;
2862
2863 ops = kvm_device_ops_table[cd->type];
2864 if (ops == NULL)
2865 return -ENODEV;
2866
2867 if (test)
2868 return 0;
2869
2870 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2871 if (!dev)
2872 return -ENOMEM;
2873
2874 dev->ops = ops;
2875 dev->kvm = kvm;
2876
2877 mutex_lock(&kvm->lock);
2878 ret = ops->create(dev, cd->type);
2879 if (ret < 0) {
2880 mutex_unlock(&kvm->lock);
2881 kfree(dev);
2882 return ret;
2883 }
2884 list_add(&dev->vm_node, &kvm->devices);
2885 mutex_unlock(&kvm->lock);
2886
2887 if (ops->init)
2888 ops->init(dev);
2889
2890 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2891 if (ret < 0) {
2892 mutex_lock(&kvm->lock);
2893 list_del(&dev->vm_node);
2894 mutex_unlock(&kvm->lock);
2895 ops->destroy(dev);
2896 return ret;
2897 }
2898
2899 kvm_get_kvm(kvm);
2900 cd->fd = ret;
2901 return 0;
2902}
2903
2904static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2905{
2906 switch (arg) {
2907 case KVM_CAP_USER_MEMORY:
2908 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2909 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2910 case KVM_CAP_INTERNAL_ERROR_DATA:
2911#ifdef CONFIG_HAVE_KVM_MSI
2912 case KVM_CAP_SIGNAL_MSI:
2913#endif
2914#ifdef CONFIG_HAVE_KVM_IRQFD
2915 case KVM_CAP_IRQFD:
2916 case KVM_CAP_IRQFD_RESAMPLE:
2917#endif
2918 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2919 case KVM_CAP_CHECK_EXTENSION_VM:
2920 return 1;
2921#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2922 case KVM_CAP_IRQ_ROUTING:
2923 return KVM_MAX_IRQ_ROUTES;
2924#endif
2925#if KVM_ADDRESS_SPACE_NUM > 1
2926 case KVM_CAP_MULTI_ADDRESS_SPACE:
2927 return KVM_ADDRESS_SPACE_NUM;
2928#endif
2929 case KVM_CAP_MAX_VCPU_ID:
2930 return KVM_MAX_VCPU_ID;
2931 default:
2932 break;
2933 }
2934 return kvm_vm_ioctl_check_extension(kvm, arg);
2935}
2936
2937static long kvm_vm_ioctl(struct file *filp,
2938 unsigned int ioctl, unsigned long arg)
2939{
2940 struct kvm *kvm = filp->private_data;
2941 void __user *argp = (void __user *)arg;
2942 int r;
2943
2944 if (kvm->mm != current->mm)
2945 return -EIO;
2946 switch (ioctl) {
2947 case KVM_CREATE_VCPU:
2948 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2949 break;
2950 case KVM_SET_USER_MEMORY_REGION: {
2951 struct kvm_userspace_memory_region kvm_userspace_mem;
2952
2953 r = -EFAULT;
2954 if (copy_from_user(&kvm_userspace_mem, argp,
2955 sizeof(kvm_userspace_mem)))
2956 goto out;
2957
2958 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2959 break;
2960 }
2961 case KVM_GET_DIRTY_LOG: {
2962 struct kvm_dirty_log log;
2963
2964 r = -EFAULT;
2965 if (copy_from_user(&log, argp, sizeof(log)))
2966 goto out;
2967 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2968 break;
2969 }
2970#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2971 case KVM_REGISTER_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_register_coalesced_mmio(kvm, &zone);
2978 break;
2979 }
2980 case KVM_UNREGISTER_COALESCED_MMIO: {
2981 struct kvm_coalesced_mmio_zone zone;
2982
2983 r = -EFAULT;
2984 if (copy_from_user(&zone, argp, sizeof(zone)))
2985 goto out;
2986 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2987 break;
2988 }
2989#endif
2990 case KVM_IRQFD: {
2991 struct kvm_irqfd data;
2992
2993 r = -EFAULT;
2994 if (copy_from_user(&data, argp, sizeof(data)))
2995 goto out;
2996 r = kvm_irqfd(kvm, &data);
2997 break;
2998 }
2999 case KVM_IOEVENTFD: {
3000 struct kvm_ioeventfd data;
3001
3002 r = -EFAULT;
3003 if (copy_from_user(&data, argp, sizeof(data)))
3004 goto out;
3005 r = kvm_ioeventfd(kvm, &data);
3006 break;
3007 }
3008#ifdef CONFIG_HAVE_KVM_MSI
3009 case KVM_SIGNAL_MSI: {
3010 struct kvm_msi msi;
3011
3012 r = -EFAULT;
3013 if (copy_from_user(&msi, argp, sizeof(msi)))
3014 goto out;
3015 r = kvm_send_userspace_msi(kvm, &msi);
3016 break;
3017 }
3018#endif
3019#ifdef __KVM_HAVE_IRQ_LINE
3020 case KVM_IRQ_LINE_STATUS:
3021 case KVM_IRQ_LINE: {
3022 struct kvm_irq_level irq_event;
3023
3024 r = -EFAULT;
3025 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
3026 goto out;
3027
3028 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
3029 ioctl == KVM_IRQ_LINE_STATUS);
3030 if (r)
3031 goto out;
3032
3033 r = -EFAULT;
3034 if (ioctl == KVM_IRQ_LINE_STATUS) {
3035 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
3036 goto out;
3037 }
3038
3039 r = 0;
3040 break;
3041 }
3042#endif
3043#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3044 case KVM_SET_GSI_ROUTING: {
3045 struct kvm_irq_routing routing;
3046 struct kvm_irq_routing __user *urouting;
3047 struct kvm_irq_routing_entry *entries = NULL;
3048
3049 r = -EFAULT;
3050 if (copy_from_user(&routing, argp, sizeof(routing)))
3051 goto out;
3052 r = -EINVAL;
3053 if (routing.nr > KVM_MAX_IRQ_ROUTES)
3054 goto out;
3055 if (routing.flags)
3056 goto out;
3057 if (routing.nr) {
3058 r = -ENOMEM;
3059 entries = vmalloc(routing.nr * sizeof(*entries));
3060 if (!entries)
3061 goto out;
3062 r = -EFAULT;
3063 urouting = argp;
3064 if (copy_from_user(entries, urouting->entries,
3065 routing.nr * sizeof(*entries)))
3066 goto out_free_irq_routing;
3067 }
3068 r = kvm_set_irq_routing(kvm, entries, routing.nr,
3069 routing.flags);
3070out_free_irq_routing:
3071 vfree(entries);
3072 break;
3073 }
3074#endif
3075 case KVM_CREATE_DEVICE: {
3076 struct kvm_create_device cd;
3077
3078 r = -EFAULT;
3079 if (copy_from_user(&cd, argp, sizeof(cd)))
3080 goto out;
3081
3082 r = kvm_ioctl_create_device(kvm, &cd);
3083 if (r)
3084 goto out;
3085
3086 r = -EFAULT;
3087 if (copy_to_user(argp, &cd, sizeof(cd)))
3088 goto out;
3089
3090 r = 0;
3091 break;
3092 }
3093 case KVM_CHECK_EXTENSION:
3094 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
3095 break;
3096 default:
3097 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
3098 }
3099out:
3100 return r;
3101}
3102
3103#ifdef CONFIG_KVM_COMPAT
3104struct compat_kvm_dirty_log {
3105 __u32 slot;
3106 __u32 padding1;
3107 union {
3108 compat_uptr_t dirty_bitmap;
3109 __u64 padding2;
3110 };
3111};
3112
3113static long kvm_vm_compat_ioctl(struct file *filp,
3114 unsigned int ioctl, unsigned long arg)
3115{
3116 struct kvm *kvm = filp->private_data;
3117 int r;
3118
3119 if (kvm->mm != current->mm)
3120 return -EIO;
3121 switch (ioctl) {
3122 case KVM_GET_DIRTY_LOG: {
3123 struct compat_kvm_dirty_log compat_log;
3124 struct kvm_dirty_log log;
3125
3126 r = -EFAULT;
3127 if (copy_from_user(&compat_log, (void __user *)arg,
3128 sizeof(compat_log)))
3129 goto out;
3130 log.slot = compat_log.slot;
3131 log.padding1 = compat_log.padding1;
3132 log.padding2 = compat_log.padding2;
3133 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3134
3135 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3136 break;
3137 }
3138 default:
3139 r = kvm_vm_ioctl(filp, ioctl, arg);
3140 }
3141
3142out:
3143 return r;
3144}
3145#endif
3146
3147static struct file_operations kvm_vm_fops = {
3148 .release = kvm_vm_release,
3149 .unlocked_ioctl = kvm_vm_ioctl,
3150#ifdef CONFIG_KVM_COMPAT
3151 .compat_ioctl = kvm_vm_compat_ioctl,
3152#endif
3153 .llseek = noop_llseek,
3154};
3155
3156static int kvm_dev_ioctl_create_vm(unsigned long type)
3157{
3158 int r;
3159 struct kvm *kvm;
3160 struct file *file;
3161
3162 kvm = kvm_create_vm(type);
3163 if (IS_ERR(kvm))
3164 return PTR_ERR(kvm);
3165#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3166 r = kvm_coalesced_mmio_init(kvm);
3167 if (r < 0) {
3168 kvm_put_kvm(kvm);
3169 return r;
3170 }
3171#endif
3172 r = get_unused_fd_flags(O_CLOEXEC);
3173 if (r < 0) {
3174 kvm_put_kvm(kvm);
3175 return r;
3176 }
3177 file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
3178 if (IS_ERR(file)) {
3179 put_unused_fd(r);
3180 kvm_put_kvm(kvm);
3181 return PTR_ERR(file);
3182 }
3183
3184 if (kvm_create_vm_debugfs(kvm, r) < 0) {
3185 put_unused_fd(r);
3186 fput(file);
3187 return -ENOMEM;
3188 }
3189
3190 fd_install(r, file);
3191 return r;
3192}
3193
3194static long kvm_dev_ioctl(struct file *filp,
3195 unsigned int ioctl, unsigned long arg)
3196{
3197 long r = -EINVAL;
3198
3199 switch (ioctl) {
3200 case KVM_GET_API_VERSION:
3201 if (arg)
3202 goto out;
3203 r = KVM_API_VERSION;
3204 break;
3205 case KVM_CREATE_VM:
3206 r = kvm_dev_ioctl_create_vm(arg);
3207 break;
3208 case KVM_CHECK_EXTENSION:
3209 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3210 break;
3211 case KVM_GET_VCPU_MMAP_SIZE:
3212 if (arg)
3213 goto out;
3214 r = PAGE_SIZE;
3215#ifdef CONFIG_X86
3216 r += PAGE_SIZE;
3217#endif
3218#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3219 r += PAGE_SIZE;
3220#endif
3221 break;
3222 case KVM_TRACE_ENABLE:
3223 case KVM_TRACE_PAUSE:
3224 case KVM_TRACE_DISABLE:
3225 r = -EOPNOTSUPP;
3226 break;
3227 default:
3228 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3229 }
3230out:
3231 return r;
3232}
3233
3234static struct file_operations kvm_chardev_ops = {
3235 .unlocked_ioctl = kvm_dev_ioctl,
3236 .compat_ioctl = kvm_dev_ioctl,
3237 .llseek = noop_llseek,
3238};
3239
3240static struct miscdevice kvm_dev = {
3241 KVM_MINOR,
3242 "kvm",
3243 &kvm_chardev_ops,
3244};
3245
3246static void hardware_enable_nolock(void *junk)
3247{
3248 int cpu = raw_smp_processor_id();
3249 int r;
3250
3251 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3252 return;
3253
3254 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3255
3256 r = kvm_arch_hardware_enable();
3257
3258 if (r) {
3259 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3260 atomic_inc(&hardware_enable_failed);
3261 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3262 }
3263}
3264
3265static int kvm_starting_cpu(unsigned int cpu)
3266{
3267 raw_spin_lock(&kvm_count_lock);
3268 if (kvm_usage_count)
3269 hardware_enable_nolock(NULL);
3270 raw_spin_unlock(&kvm_count_lock);
3271 return 0;
3272}
3273
3274static void hardware_disable_nolock(void *junk)
3275{
3276 int cpu = raw_smp_processor_id();
3277
3278 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3279 return;
3280 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3281 kvm_arch_hardware_disable();
3282}
3283
3284static int kvm_dying_cpu(unsigned int cpu)
3285{
3286 raw_spin_lock(&kvm_count_lock);
3287 if (kvm_usage_count)
3288 hardware_disable_nolock(NULL);
3289 raw_spin_unlock(&kvm_count_lock);
3290 return 0;
3291}
3292
3293static void hardware_disable_all_nolock(void)
3294{
3295 BUG_ON(!kvm_usage_count);
3296
3297 kvm_usage_count--;
3298 if (!kvm_usage_count)
3299 on_each_cpu(hardware_disable_nolock, NULL, 1);
3300}
3301
3302static void hardware_disable_all(void)
3303{
3304 raw_spin_lock(&kvm_count_lock);
3305 hardware_disable_all_nolock();
3306 raw_spin_unlock(&kvm_count_lock);
3307}
3308
3309static int hardware_enable_all(void)
3310{
3311 int r = 0;
3312
3313 raw_spin_lock(&kvm_count_lock);
3314
3315 kvm_usage_count++;
3316 if (kvm_usage_count == 1) {
3317 atomic_set(&hardware_enable_failed, 0);
3318 on_each_cpu(hardware_enable_nolock, NULL, 1);
3319
3320 if (atomic_read(&hardware_enable_failed)) {
3321 hardware_disable_all_nolock();
3322 r = -EBUSY;
3323 }
3324 }
3325
3326 raw_spin_unlock(&kvm_count_lock);
3327
3328 return r;
3329}
3330
3331static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3332 void *v)
3333{
3334
3335
3336
3337
3338
3339
3340 pr_info("kvm: exiting hardware virtualization\n");
3341 kvm_rebooting = true;
3342 on_each_cpu(hardware_disable_nolock, NULL, 1);
3343 return NOTIFY_OK;
3344}
3345
3346static struct notifier_block kvm_reboot_notifier = {
3347 .notifier_call = kvm_reboot,
3348 .priority = 0,
3349};
3350
3351static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3352{
3353 int i;
3354
3355 for (i = 0; i < bus->dev_count; i++) {
3356 struct kvm_io_device *pos = bus->range[i].dev;
3357
3358 kvm_iodevice_destructor(pos);
3359 }
3360 kfree(bus);
3361}
3362
3363static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3364 const struct kvm_io_range *r2)
3365{
3366 gpa_t addr1 = r1->addr;
3367 gpa_t addr2 = r2->addr;
3368
3369 if (addr1 < addr2)
3370 return -1;
3371
3372
3373
3374
3375
3376
3377 if (r2->len) {
3378 addr1 += r1->len;
3379 addr2 += r2->len;
3380 }
3381
3382 if (addr1 > addr2)
3383 return 1;
3384
3385 return 0;
3386}
3387
3388static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3389{
3390 return kvm_io_bus_cmp(p1, p2);
3391}
3392
3393static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3394 gpa_t addr, int len)
3395{
3396 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3397 .addr = addr,
3398 .len = len,
3399 .dev = dev,
3400 };
3401
3402 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3403 kvm_io_bus_sort_cmp, NULL);
3404
3405 return 0;
3406}
3407
3408static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3409 gpa_t addr, int len)
3410{
3411 struct kvm_io_range *range, key;
3412 int off;
3413
3414 key = (struct kvm_io_range) {
3415 .addr = addr,
3416 .len = len,
3417 };
3418
3419 range = bsearch(&key, bus->range, bus->dev_count,
3420 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3421 if (range == NULL)
3422 return -ENOENT;
3423
3424 off = range - bus->range;
3425
3426 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3427 off--;
3428
3429 return off;
3430}
3431
3432static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3433 struct kvm_io_range *range, const void *val)
3434{
3435 int idx;
3436
3437 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3438 if (idx < 0)
3439 return -EOPNOTSUPP;
3440
3441 while (idx < bus->dev_count &&
3442 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3443 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3444 range->len, val))
3445 return idx;
3446 idx++;
3447 }
3448
3449 return -EOPNOTSUPP;
3450}
3451
3452
3453int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3454 int len, const void *val)
3455{
3456 struct kvm_io_bus *bus;
3457 struct kvm_io_range range;
3458 int r;
3459
3460 range = (struct kvm_io_range) {
3461 .addr = addr,
3462 .len = len,
3463 };
3464
3465 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3466 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3467 return r < 0 ? r : 0;
3468}
3469
3470
3471int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3472 gpa_t addr, int len, const void *val, long cookie)
3473{
3474 struct kvm_io_bus *bus;
3475 struct kvm_io_range range;
3476
3477 range = (struct kvm_io_range) {
3478 .addr = addr,
3479 .len = len,
3480 };
3481
3482 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3483
3484
3485 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3486 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3487 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3488 val))
3489 return cookie;
3490
3491
3492
3493
3494
3495 return __kvm_io_bus_write(vcpu, bus, &range, val);
3496}
3497
3498static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3499 struct kvm_io_range *range, void *val)
3500{
3501 int idx;
3502
3503 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3504 if (idx < 0)
3505 return -EOPNOTSUPP;
3506
3507 while (idx < bus->dev_count &&
3508 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3509 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3510 range->len, val))
3511 return idx;
3512 idx++;
3513 }
3514
3515 return -EOPNOTSUPP;
3516}
3517EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3518
3519
3520int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3521 int len, void *val)
3522{
3523 struct kvm_io_bus *bus;
3524 struct kvm_io_range range;
3525 int r;
3526
3527 range = (struct kvm_io_range) {
3528 .addr = addr,
3529 .len = len,
3530 };
3531
3532 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3533 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3534 return r < 0 ? r : 0;
3535}
3536
3537
3538
3539int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3540 int len, struct kvm_io_device *dev)
3541{
3542 struct kvm_io_bus *new_bus, *bus;
3543
3544 bus = kvm->buses[bus_idx];
3545
3546 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3547 return -ENOSPC;
3548
3549 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3550 sizeof(struct kvm_io_range)), GFP_KERNEL);
3551 if (!new_bus)
3552 return -ENOMEM;
3553 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3554 sizeof(struct kvm_io_range)));
3555 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3556 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3557 synchronize_srcu_expedited(&kvm->srcu);
3558 kfree(bus);
3559
3560 return 0;
3561}
3562
3563
3564int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3565 struct kvm_io_device *dev)
3566{
3567 int i, r;
3568 struct kvm_io_bus *new_bus, *bus;
3569
3570 bus = kvm->buses[bus_idx];
3571 r = -ENOENT;
3572 for (i = 0; i < bus->dev_count; i++)
3573 if (bus->range[i].dev == dev) {
3574 r = 0;
3575 break;
3576 }
3577
3578 if (r)
3579 return r;
3580
3581 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3582 sizeof(struct kvm_io_range)), GFP_KERNEL);
3583 if (!new_bus)
3584 return -ENOMEM;
3585
3586 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3587 new_bus->dev_count--;
3588 memcpy(new_bus->range + i, bus->range + i + 1,
3589 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3590
3591 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3592 synchronize_srcu_expedited(&kvm->srcu);
3593 kfree(bus);
3594 return r;
3595}
3596
3597struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3598 gpa_t addr)
3599{
3600 struct kvm_io_bus *bus;
3601 int dev_idx, srcu_idx;
3602 struct kvm_io_device *iodev = NULL;
3603
3604 srcu_idx = srcu_read_lock(&kvm->srcu);
3605
3606 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
3607
3608 dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
3609 if (dev_idx < 0)
3610 goto out_unlock;
3611
3612 iodev = bus->range[dev_idx].dev;
3613
3614out_unlock:
3615 srcu_read_unlock(&kvm->srcu, srcu_idx);
3616
3617 return iodev;
3618}
3619EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
3620
3621static int kvm_debugfs_open(struct inode *inode, struct file *file,
3622 int (*get)(void *, u64 *), int (*set)(void *, u64),
3623 const char *fmt)
3624{
3625 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3626 inode->i_private;
3627
3628
3629
3630
3631
3632
3633 if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0))
3634 return -ENOENT;
3635
3636 if (simple_attr_open(inode, file, get, set, fmt)) {
3637 kvm_put_kvm(stat_data->kvm);
3638 return -ENOMEM;
3639 }
3640
3641 return 0;
3642}
3643
3644static int kvm_debugfs_release(struct inode *inode, struct file *file)
3645{
3646 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3647 inode->i_private;
3648
3649 simple_attr_release(inode, file);
3650 kvm_put_kvm(stat_data->kvm);
3651
3652 return 0;
3653}
3654
3655static int vm_stat_get_per_vm(void *data, u64 *val)
3656{
3657 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3658
3659 *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset);
3660
3661 return 0;
3662}
3663
3664static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3665{
3666 __simple_attr_check_format("%llu\n", 0ull);
3667 return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3668 NULL, "%llu\n");
3669}
3670
3671static const struct file_operations vm_stat_get_per_vm_fops = {
3672 .owner = THIS_MODULE,
3673 .open = vm_stat_get_per_vm_open,
3674 .release = kvm_debugfs_release,
3675 .read = simple_attr_read,
3676 .write = simple_attr_write,
3677 .llseek = generic_file_llseek,
3678};
3679
3680static int vcpu_stat_get_per_vm(void *data, u64 *val)
3681{
3682 int i;
3683 struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3684 struct kvm_vcpu *vcpu;
3685
3686 *val = 0;
3687
3688 kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3689 *val += *(u64 *)((void *)vcpu + stat_data->offset);
3690
3691 return 0;
3692}
3693
3694static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3695{
3696 __simple_attr_check_format("%llu\n", 0ull);
3697 return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3698 NULL, "%llu\n");
3699}
3700
3701static const struct file_operations vcpu_stat_get_per_vm_fops = {
3702 .owner = THIS_MODULE,
3703 .open = vcpu_stat_get_per_vm_open,
3704 .release = kvm_debugfs_release,
3705 .read = simple_attr_read,
3706 .write = simple_attr_write,
3707 .llseek = generic_file_llseek,
3708};
3709
3710static const struct file_operations *stat_fops_per_vm[] = {
3711 [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3712 [KVM_STAT_VM] = &vm_stat_get_per_vm_fops,
3713};
3714
3715static int vm_stat_get(void *_offset, u64 *val)
3716{
3717 unsigned offset = (long)_offset;
3718 struct kvm *kvm;
3719 struct kvm_stat_data stat_tmp = {.offset = offset};
3720 u64 tmp_val;
3721
3722 *val = 0;
3723 spin_lock(&kvm_lock);
3724 list_for_each_entry(kvm, &vm_list, vm_list) {
3725 stat_tmp.kvm = kvm;
3726 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3727 *val += tmp_val;
3728 }
3729 spin_unlock(&kvm_lock);
3730 return 0;
3731}
3732
3733DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3734
3735static int vcpu_stat_get(void *_offset, u64 *val)
3736{
3737 unsigned offset = (long)_offset;
3738 struct kvm *kvm;
3739 struct kvm_stat_data stat_tmp = {.offset = offset};
3740 u64 tmp_val;
3741
3742 *val = 0;
3743 spin_lock(&kvm_lock);
3744 list_for_each_entry(kvm, &vm_list, vm_list) {
3745 stat_tmp.kvm = kvm;
3746 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3747 *val += tmp_val;
3748 }
3749 spin_unlock(&kvm_lock);
3750 return 0;
3751}
3752
3753DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3754
3755static const struct file_operations *stat_fops[] = {
3756 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3757 [KVM_STAT_VM] = &vm_stat_fops,
3758};
3759
3760static int kvm_init_debug(void)
3761{
3762 int r = -EEXIST;
3763 struct kvm_stats_debugfs_item *p;
3764
3765 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3766 if (kvm_debugfs_dir == NULL)
3767 goto out;
3768
3769 kvm_debugfs_num_entries = 0;
3770 for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3771 if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3772 (void *)(long)p->offset,
3773 stat_fops[p->kind]))
3774 goto out_dir;
3775 }
3776
3777 return 0;
3778
3779out_dir:
3780 debugfs_remove_recursive(kvm_debugfs_dir);
3781out:
3782 return r;
3783}
3784
3785static int kvm_suspend(void)
3786{
3787 if (kvm_usage_count)
3788 hardware_disable_nolock(NULL);
3789 return 0;
3790}
3791
3792static void kvm_resume(void)
3793{
3794 if (kvm_usage_count) {
3795 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3796 hardware_enable_nolock(NULL);
3797 }
3798}
3799
3800static struct syscore_ops kvm_syscore_ops = {
3801 .suspend = kvm_suspend,
3802 .resume = kvm_resume,
3803};
3804
3805static inline
3806struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3807{
3808 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3809}
3810
3811static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3812{
3813 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3814
3815 if (vcpu->preempted)
3816 vcpu->preempted = false;
3817
3818 kvm_arch_sched_in(vcpu, cpu);
3819
3820 kvm_arch_vcpu_load(vcpu, cpu);
3821}
3822
3823static void kvm_sched_out(struct preempt_notifier *pn,
3824 struct task_struct *next)
3825{
3826 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3827
3828 if (current->state == TASK_RUNNING)
3829 vcpu->preempted = true;
3830 kvm_arch_vcpu_put(vcpu);
3831}
3832
3833int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3834 struct module *module)
3835{
3836 int r;
3837 int cpu;
3838
3839 r = kvm_arch_init(opaque);
3840 if (r)
3841 goto out_fail;
3842
3843
3844
3845
3846
3847
3848
3849
3850 r = kvm_irqfd_init();
3851 if (r)
3852 goto out_irqfd;
3853
3854 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3855 r = -ENOMEM;
3856 goto out_free_0;
3857 }
3858
3859 r = kvm_arch_hardware_setup();
3860 if (r < 0)
3861 goto out_free_0a;
3862
3863 for_each_online_cpu(cpu) {
3864 smp_call_function_single(cpu,
3865 kvm_arch_check_processor_compat,
3866 &r, 1);
3867 if (r < 0)
3868 goto out_free_1;
3869 }
3870
3871 r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "AP_KVM_STARTING",
3872 kvm_starting_cpu, kvm_dying_cpu);
3873 if (r)
3874 goto out_free_2;
3875 register_reboot_notifier(&kvm_reboot_notifier);
3876
3877
3878 if (!vcpu_align)
3879 vcpu_align = __alignof__(struct kvm_vcpu);
3880 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3881 0, NULL);
3882 if (!kvm_vcpu_cache) {
3883 r = -ENOMEM;
3884 goto out_free_3;
3885 }
3886
3887 r = kvm_async_pf_init();
3888 if (r)
3889 goto out_free;
3890
3891 kvm_chardev_ops.owner = module;
3892 kvm_vm_fops.owner = module;
3893 kvm_vcpu_fops.owner = module;
3894
3895 r = misc_register(&kvm_dev);
3896 if (r) {
3897 pr_err("kvm: misc device register failed\n");
3898 goto out_unreg;
3899 }
3900
3901 register_syscore_ops(&kvm_syscore_ops);
3902
3903 kvm_preempt_ops.sched_in = kvm_sched_in;
3904 kvm_preempt_ops.sched_out = kvm_sched_out;
3905
3906 r = kvm_init_debug();
3907 if (r) {
3908 pr_err("kvm: create debugfs files failed\n");
3909 goto out_undebugfs;
3910 }
3911
3912 r = kvm_vfio_ops_init();
3913 WARN_ON(r);
3914
3915 return 0;
3916
3917out_undebugfs:
3918 unregister_syscore_ops(&kvm_syscore_ops);
3919 misc_deregister(&kvm_dev);
3920out_unreg:
3921 kvm_async_pf_deinit();
3922out_free:
3923 kmem_cache_destroy(kvm_vcpu_cache);
3924out_free_3:
3925 unregister_reboot_notifier(&kvm_reboot_notifier);
3926 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
3927out_free_2:
3928out_free_1:
3929 kvm_arch_hardware_unsetup();
3930out_free_0a:
3931 free_cpumask_var(cpus_hardware_enabled);
3932out_free_0:
3933 kvm_irqfd_exit();
3934out_irqfd:
3935 kvm_arch_exit();
3936out_fail:
3937 return r;
3938}
3939EXPORT_SYMBOL_GPL(kvm_init);
3940
3941void kvm_exit(void)
3942{
3943 debugfs_remove_recursive(kvm_debugfs_dir);
3944 misc_deregister(&kvm_dev);
3945 kmem_cache_destroy(kvm_vcpu_cache);
3946 kvm_async_pf_deinit();
3947 unregister_syscore_ops(&kvm_syscore_ops);
3948 unregister_reboot_notifier(&kvm_reboot_notifier);
3949 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
3950 on_each_cpu(hardware_disable_nolock, NULL, 1);
3951 kvm_arch_hardware_unsetup();
3952 kvm_arch_exit();
3953 kvm_irqfd_exit();
3954 free_cpumask_var(cpus_hardware_enabled);
3955 kvm_vfio_ops_exit();
3956}
3957EXPORT_SYMBOL_GPL(kvm_exit);
3958