2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
26 #include <linux/miscdevice.h>
27 #include <linux/vmalloc.h>
28 #include <linux/reboot.h>
29 #include <linux/debugfs.h>
30 #include <linux/highmem.h>
31 #include <linux/file.h>
32 #include <linux/sysdev.h>
33 #include <linux/cpu.h>
34 #include <linux/sched.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
50 #include <asm/processor.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm-generic/bitops/le.h>
56 #include "coalesced_mmio.h"
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/kvm.h>
61 MODULE_AUTHOR("Qumranet");
62 MODULE_LICENSE("GPL");
67 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
70 DEFINE_SPINLOCK(kvm_lock
);
73 static cpumask_var_t cpus_hardware_enabled
;
74 static int kvm_usage_count
= 0;
75 static atomic_t hardware_enable_failed
;
77 struct kmem_cache
*kvm_vcpu_cache
;
78 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
80 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
82 struct dentry
*kvm_debugfs_dir
;
84 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
86 static int hardware_enable_all(void);
87 static void hardware_disable_all(void);
89 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
91 static bool kvm_rebooting
;
93 static bool largepages_enabled
= true;
95 inline int kvm_is_mmio_pfn(pfn_t pfn
)
98 struct page
*page
= compound_head(pfn_to_page(pfn
));
99 return PageReserved(page
);
106 * Switches to specified vcpu, until a matching vcpu_put()
108 void vcpu_load(struct kvm_vcpu
*vcpu
)
112 mutex_lock(&vcpu
->mutex
);
114 preempt_notifier_register(&vcpu
->preempt_notifier
);
115 kvm_arch_vcpu_load(vcpu
, cpu
);
119 void vcpu_put(struct kvm_vcpu
*vcpu
)
122 kvm_arch_vcpu_put(vcpu
);
123 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
125 mutex_unlock(&vcpu
->mutex
);
128 static void ack_flush(void *_completed
)
132 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
137 struct kvm_vcpu
*vcpu
;
139 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
141 raw_spin_lock(&kvm
->requests_lock
);
142 me
= smp_processor_id();
143 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
144 if (test_and_set_bit(req
, &vcpu
->requests
))
147 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
)
148 cpumask_set_cpu(cpu
, cpus
);
150 if (unlikely(cpus
== NULL
))
151 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
152 else if (!cpumask_empty(cpus
))
153 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
156 raw_spin_unlock(&kvm
->requests_lock
);
157 free_cpumask_var(cpus
);
161 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
163 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
164 ++kvm
->stat
.remote_tlb_flush
;
167 void kvm_reload_remote_mmus(struct kvm
*kvm
)
169 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
172 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
177 mutex_init(&vcpu
->mutex
);
181 init_waitqueue_head(&vcpu
->wq
);
183 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
188 vcpu
->run
= page_address(page
);
190 r
= kvm_arch_vcpu_init(vcpu
);
196 free_page((unsigned long)vcpu
->run
);
200 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
202 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
204 kvm_arch_vcpu_uninit(vcpu
);
205 free_page((unsigned long)vcpu
->run
);
207 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
209 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
210 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
212 return container_of(mn
, struct kvm
, mmu_notifier
);
215 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
216 struct mm_struct
*mm
,
217 unsigned long address
)
219 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
220 int need_tlb_flush
, idx
;
223 * When ->invalidate_page runs, the linux pte has been zapped
224 * already but the page is still allocated until
225 * ->invalidate_page returns. So if we increase the sequence
226 * here the kvm page fault will notice if the spte can't be
227 * established because the page is going to be freed. If
228 * instead the kvm page fault establishes the spte before
229 * ->invalidate_page runs, kvm_unmap_hva will release it
232 * The sequence increase only need to be seen at spin_unlock
233 * time, and not at spin_lock time.
235 * Increasing the sequence after the spin_unlock would be
236 * unsafe because the kvm page fault could then establish the
237 * pte after kvm_unmap_hva returned, without noticing the page
238 * is going to be freed.
240 idx
= srcu_read_lock(&kvm
->srcu
);
241 spin_lock(&kvm
->mmu_lock
);
242 kvm
->mmu_notifier_seq
++;
243 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
244 spin_unlock(&kvm
->mmu_lock
);
245 srcu_read_unlock(&kvm
->srcu
, idx
);
247 /* we've to flush the tlb before the pages can be freed */
249 kvm_flush_remote_tlbs(kvm
);
253 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
254 struct mm_struct
*mm
,
255 unsigned long address
,
258 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
261 idx
= srcu_read_lock(&kvm
->srcu
);
262 spin_lock(&kvm
->mmu_lock
);
263 kvm
->mmu_notifier_seq
++;
264 kvm_set_spte_hva(kvm
, address
, pte
);
265 spin_unlock(&kvm
->mmu_lock
);
266 srcu_read_unlock(&kvm
->srcu
, idx
);
269 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
270 struct mm_struct
*mm
,
274 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
275 int need_tlb_flush
= 0, idx
;
277 idx
= srcu_read_lock(&kvm
->srcu
);
278 spin_lock(&kvm
->mmu_lock
);
280 * The count increase must become visible at unlock time as no
281 * spte can be established without taking the mmu_lock and
282 * count is also read inside the mmu_lock critical section.
284 kvm
->mmu_notifier_count
++;
285 for (; start
< end
; start
+= PAGE_SIZE
)
286 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
287 spin_unlock(&kvm
->mmu_lock
);
288 srcu_read_unlock(&kvm
->srcu
, idx
);
290 /* we've to flush the tlb before the pages can be freed */
292 kvm_flush_remote_tlbs(kvm
);
295 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
296 struct mm_struct
*mm
,
300 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
302 spin_lock(&kvm
->mmu_lock
);
304 * This sequence increase will notify the kvm page fault that
305 * the page that is going to be mapped in the spte could have
308 kvm
->mmu_notifier_seq
++;
310 * The above sequence increase must be visible before the
311 * below count decrease but both values are read by the kvm
312 * page fault under mmu_lock spinlock so we don't need to add
313 * a smb_wmb() here in between the two.
315 kvm
->mmu_notifier_count
--;
316 spin_unlock(&kvm
->mmu_lock
);
318 BUG_ON(kvm
->mmu_notifier_count
< 0);
321 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
322 struct mm_struct
*mm
,
323 unsigned long address
)
325 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
328 idx
= srcu_read_lock(&kvm
->srcu
);
329 spin_lock(&kvm
->mmu_lock
);
330 young
= kvm_age_hva(kvm
, address
);
331 spin_unlock(&kvm
->mmu_lock
);
332 srcu_read_unlock(&kvm
->srcu
, idx
);
335 kvm_flush_remote_tlbs(kvm
);
340 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
341 struct mm_struct
*mm
)
343 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
346 idx
= srcu_read_lock(&kvm
->srcu
);
347 kvm_arch_flush_shadow(kvm
);
348 srcu_read_unlock(&kvm
->srcu
, idx
);
351 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
352 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
353 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
354 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
355 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
356 .change_pte
= kvm_mmu_notifier_change_pte
,
357 .release
= kvm_mmu_notifier_release
,
360 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
362 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
363 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
366 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
368 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
373 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
375 static struct kvm
*kvm_create_vm(void)
378 struct kvm
*kvm
= kvm_arch_create_vm();
383 r
= hardware_enable_all();
385 goto out_err_nodisable
;
387 #ifdef CONFIG_HAVE_KVM_IRQCHIP
388 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
389 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
393 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
396 if (init_srcu_struct(&kvm
->srcu
))
398 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
399 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
401 if (!kvm
->buses
[i
]) {
402 cleanup_srcu_struct(&kvm
->srcu
);
407 r
= kvm_init_mmu_notifier(kvm
);
409 cleanup_srcu_struct(&kvm
->srcu
);
413 kvm
->mm
= current
->mm
;
414 atomic_inc(&kvm
->mm
->mm_count
);
415 spin_lock_init(&kvm
->mmu_lock
);
416 raw_spin_lock_init(&kvm
->requests_lock
);
417 kvm_eventfd_init(kvm
);
418 mutex_init(&kvm
->lock
);
419 mutex_init(&kvm
->irq_lock
);
420 mutex_init(&kvm
->slots_lock
);
421 atomic_set(&kvm
->users_count
, 1);
422 spin_lock(&kvm_lock
);
423 list_add(&kvm
->vm_list
, &vm_list
);
424 spin_unlock(&kvm_lock
);
425 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
426 kvm_coalesced_mmio_init(kvm
);
432 hardware_disable_all();
434 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
435 kfree(kvm
->buses
[i
]);
436 kfree(kvm
->memslots
);
442 * Free any memory in @free but not in @dont.
444 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
445 struct kvm_memory_slot
*dont
)
449 if (!dont
|| free
->rmap
!= dont
->rmap
)
452 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
453 vfree(free
->dirty_bitmap
);
456 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
457 if (!dont
|| free
->lpage_info
[i
] != dont
->lpage_info
[i
]) {
458 vfree(free
->lpage_info
[i
]);
459 free
->lpage_info
[i
] = NULL
;
464 free
->dirty_bitmap
= NULL
;
468 void kvm_free_physmem(struct kvm
*kvm
)
471 struct kvm_memslots
*slots
= kvm
->memslots
;
473 for (i
= 0; i
< slots
->nmemslots
; ++i
)
474 kvm_free_physmem_slot(&slots
->memslots
[i
], NULL
);
476 kfree(kvm
->memslots
);
479 static void kvm_destroy_vm(struct kvm
*kvm
)
482 struct mm_struct
*mm
= kvm
->mm
;
484 kvm_arch_sync_events(kvm
);
485 spin_lock(&kvm_lock
);
486 list_del(&kvm
->vm_list
);
487 spin_unlock(&kvm_lock
);
488 kvm_free_irq_routing(kvm
);
489 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
490 kvm_io_bus_destroy(kvm
->buses
[i
]);
491 kvm_coalesced_mmio_free(kvm
);
492 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
493 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
495 kvm_arch_flush_shadow(kvm
);
497 kvm_arch_destroy_vm(kvm
);
498 hardware_disable_all();
502 void kvm_get_kvm(struct kvm
*kvm
)
504 atomic_inc(&kvm
->users_count
);
506 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
508 void kvm_put_kvm(struct kvm
*kvm
)
510 if (atomic_dec_and_test(&kvm
->users_count
))
513 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
516 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
518 struct kvm
*kvm
= filp
->private_data
;
520 kvm_irqfd_release(kvm
);
527 * Allocate some memory and give it an address in the guest physical address
530 * Discontiguous memory is allowed, mostly for framebuffers.
532 * Must be called holding mmap_sem for write.
534 int __kvm_set_memory_region(struct kvm
*kvm
,
535 struct kvm_userspace_memory_region
*mem
,
538 int r
, flush_shadow
= 0;
540 unsigned long npages
;
542 struct kvm_memory_slot
*memslot
;
543 struct kvm_memory_slot old
, new;
544 struct kvm_memslots
*slots
, *old_memslots
;
547 /* General sanity checks */
548 if (mem
->memory_size
& (PAGE_SIZE
- 1))
550 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
552 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
554 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
556 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
559 memslot
= &kvm
->memslots
->memslots
[mem
->slot
];
560 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
561 npages
= mem
->memory_size
>> PAGE_SHIFT
;
564 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
566 new = old
= *memslot
;
568 new.base_gfn
= base_gfn
;
570 new.flags
= mem
->flags
;
572 /* Disallow changing a memory slot's size. */
574 if (npages
&& old
.npages
&& npages
!= old
.npages
)
577 /* Check for overlaps */
579 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
580 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
582 if (s
== memslot
|| !s
->npages
)
584 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
585 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
589 /* Free page dirty bitmap if unneeded */
590 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
591 new.dirty_bitmap
= NULL
;
595 /* Allocate if a slot is being created */
597 if (npages
&& !new.rmap
) {
598 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
603 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
605 new.user_alloc
= user_alloc
;
606 new.userspace_addr
= mem
->userspace_addr
;
611 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
617 /* Avoid unused variable warning if no large pages */
620 if (new.lpage_info
[i
])
623 lpages
= 1 + (base_gfn
+ npages
- 1) /
624 KVM_PAGES_PER_HPAGE(level
);
625 lpages
-= base_gfn
/ KVM_PAGES_PER_HPAGE(level
);
627 new.lpage_info
[i
] = vmalloc(lpages
* sizeof(*new.lpage_info
[i
]));
629 if (!new.lpage_info
[i
])
632 memset(new.lpage_info
[i
], 0,
633 lpages
* sizeof(*new.lpage_info
[i
]));
635 if (base_gfn
% KVM_PAGES_PER_HPAGE(level
))
636 new.lpage_info
[i
][0].write_count
= 1;
637 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE(level
))
638 new.lpage_info
[i
][lpages
- 1].write_count
= 1;
639 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
641 * If the gfn and userspace address are not aligned wrt each
642 * other, or if explicitly asked to, disable large page
643 * support for this slot
645 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
647 for (j
= 0; j
< lpages
; ++j
)
648 new.lpage_info
[i
][j
].write_count
= 1;
653 /* Allocate page dirty bitmap if needed */
654 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
655 unsigned long dirty_bytes
= kvm_dirty_bitmap_bytes(&new);
657 new.dirty_bitmap
= vmalloc(dirty_bytes
);
658 if (!new.dirty_bitmap
)
660 memset(new.dirty_bitmap
, 0, dirty_bytes
);
661 /* destroy any largepage mappings for dirty tracking */
665 #else /* not defined CONFIG_S390 */
666 new.user_alloc
= user_alloc
;
668 new.userspace_addr
= mem
->userspace_addr
;
669 #endif /* not defined CONFIG_S390 */
673 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
676 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
677 if (mem
->slot
>= slots
->nmemslots
)
678 slots
->nmemslots
= mem
->slot
+ 1;
679 slots
->memslots
[mem
->slot
].flags
|= KVM_MEMSLOT_INVALID
;
681 old_memslots
= kvm
->memslots
;
682 rcu_assign_pointer(kvm
->memslots
, slots
);
683 synchronize_srcu_expedited(&kvm
->srcu
);
684 /* From this point no new shadow pages pointing to a deleted
685 * memslot will be created.
687 * validation of sp->gfn happens in:
688 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
689 * - kvm_is_visible_gfn (mmu_check_roots)
691 kvm_arch_flush_shadow(kvm
);
695 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
700 /* map the pages in iommu page table */
702 r
= kvm_iommu_map_pages(kvm
, &new);
709 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
712 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
713 if (mem
->slot
>= slots
->nmemslots
)
714 slots
->nmemslots
= mem
->slot
+ 1;
716 /* actual memory is freed via old in kvm_free_physmem_slot below */
719 new.dirty_bitmap
= NULL
;
720 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
)
721 new.lpage_info
[i
] = NULL
;
724 slots
->memslots
[mem
->slot
] = new;
725 old_memslots
= kvm
->memslots
;
726 rcu_assign_pointer(kvm
->memslots
, slots
);
727 synchronize_srcu_expedited(&kvm
->srcu
);
729 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
731 kvm_free_physmem_slot(&old
, &new);
735 kvm_arch_flush_shadow(kvm
);
740 kvm_free_physmem_slot(&new, &old
);
745 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
747 int kvm_set_memory_region(struct kvm
*kvm
,
748 struct kvm_userspace_memory_region
*mem
,
753 mutex_lock(&kvm
->slots_lock
);
754 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
755 mutex_unlock(&kvm
->slots_lock
);
758 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
760 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
762 kvm_userspace_memory_region
*mem
,
765 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
767 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
770 int kvm_get_dirty_log(struct kvm
*kvm
,
771 struct kvm_dirty_log
*log
, int *is_dirty
)
773 struct kvm_memory_slot
*memslot
;
776 unsigned long any
= 0;
779 if (log
->slot
>= KVM_MEMORY_SLOTS
)
782 memslot
= &kvm
->memslots
->memslots
[log
->slot
];
784 if (!memslot
->dirty_bitmap
)
787 n
= kvm_dirty_bitmap_bytes(memslot
);
789 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
790 any
= memslot
->dirty_bitmap
[i
];
793 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
804 void kvm_disable_largepages(void)
806 largepages_enabled
= false;
808 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
810 int is_error_page(struct page
*page
)
812 return page
== bad_page
;
814 EXPORT_SYMBOL_GPL(is_error_page
);
816 int is_error_pfn(pfn_t pfn
)
818 return pfn
== bad_pfn
;
820 EXPORT_SYMBOL_GPL(is_error_pfn
);
822 static inline unsigned long bad_hva(void)
827 int kvm_is_error_hva(unsigned long addr
)
829 return addr
== bad_hva();
831 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
833 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
836 struct kvm_memslots
*slots
= rcu_dereference(kvm
->memslots
);
838 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
839 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
841 if (gfn
>= memslot
->base_gfn
842 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
847 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
849 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
851 gfn
= unalias_gfn(kvm
, gfn
);
852 return gfn_to_memslot_unaliased(kvm
, gfn
);
855 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
858 struct kvm_memslots
*slots
= rcu_dereference(kvm
->memslots
);
860 gfn
= unalias_gfn_instantiation(kvm
, gfn
);
861 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
862 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
864 if (memslot
->flags
& KVM_MEMSLOT_INVALID
)
867 if (gfn
>= memslot
->base_gfn
868 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
873 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
875 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
877 struct vm_area_struct
*vma
;
878 unsigned long addr
, size
;
882 addr
= gfn_to_hva(kvm
, gfn
);
883 if (kvm_is_error_hva(addr
))
886 down_read(¤t
->mm
->mmap_sem
);
887 vma
= find_vma(current
->mm
, addr
);
891 size
= vma_kernel_pagesize(vma
);
894 up_read(¤t
->mm
->mmap_sem
);
899 int memslot_id(struct kvm
*kvm
, gfn_t gfn
)
902 struct kvm_memslots
*slots
= rcu_dereference(kvm
->memslots
);
903 struct kvm_memory_slot
*memslot
= NULL
;
905 gfn
= unalias_gfn(kvm
, gfn
);
906 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
907 memslot
= &slots
->memslots
[i
];
909 if (gfn
>= memslot
->base_gfn
910 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
914 return memslot
- slots
->memslots
;
917 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
919 struct kvm_memory_slot
*slot
;
921 gfn
= unalias_gfn_instantiation(kvm
, gfn
);
922 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
923 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
925 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
927 EXPORT_SYMBOL_GPL(gfn_to_hva
);
929 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
)
931 struct page
*page
[1];
937 npages
= get_user_pages_fast(addr
, 1, 1, page
);
939 if (unlikely(npages
!= 1)) {
940 struct vm_area_struct
*vma
;
942 down_read(¤t
->mm
->mmap_sem
);
943 vma
= find_vma(current
->mm
, addr
);
945 if (vma
== NULL
|| addr
< vma
->vm_start
||
946 !(vma
->vm_flags
& VM_PFNMAP
)) {
947 up_read(¤t
->mm
->mmap_sem
);
949 return page_to_pfn(bad_page
);
952 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
953 up_read(¤t
->mm
->mmap_sem
);
954 BUG_ON(!kvm_is_mmio_pfn(pfn
));
956 pfn
= page_to_pfn(page
[0]);
961 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
965 addr
= gfn_to_hva(kvm
, gfn
);
966 if (kvm_is_error_hva(addr
)) {
968 return page_to_pfn(bad_page
);
971 return hva_to_pfn(kvm
, addr
);
973 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
975 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
977 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
980 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
981 struct kvm_memory_slot
*slot
, gfn_t gfn
)
983 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
984 return hva_to_pfn(kvm
, addr
);
987 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
991 pfn
= gfn_to_pfn(kvm
, gfn
);
992 if (!kvm_is_mmio_pfn(pfn
))
993 return pfn_to_page(pfn
);
995 WARN_ON(kvm_is_mmio_pfn(pfn
));
1001 EXPORT_SYMBOL_GPL(gfn_to_page
);
1003 void kvm_release_page_clean(struct page
*page
)
1005 kvm_release_pfn_clean(page_to_pfn(page
));
1007 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1009 void kvm_release_pfn_clean(pfn_t pfn
)
1011 if (!kvm_is_mmio_pfn(pfn
))
1012 put_page(pfn_to_page(pfn
));
1014 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1016 void kvm_release_page_dirty(struct page
*page
)
1018 kvm_release_pfn_dirty(page_to_pfn(page
));
1020 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1022 void kvm_release_pfn_dirty(pfn_t pfn
)
1024 kvm_set_pfn_dirty(pfn
);
1025 kvm_release_pfn_clean(pfn
);
1027 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1029 void kvm_set_page_dirty(struct page
*page
)
1031 kvm_set_pfn_dirty(page_to_pfn(page
));
1033 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1035 void kvm_set_pfn_dirty(pfn_t pfn
)
1037 if (!kvm_is_mmio_pfn(pfn
)) {
1038 struct page
*page
= pfn_to_page(pfn
);
1039 if (!PageReserved(page
))
1043 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1045 void kvm_set_pfn_accessed(pfn_t pfn
)
1047 if (!kvm_is_mmio_pfn(pfn
))
1048 mark_page_accessed(pfn_to_page(pfn
));
1050 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1052 void kvm_get_pfn(pfn_t pfn
)
1054 if (!kvm_is_mmio_pfn(pfn
))
1055 get_page(pfn_to_page(pfn
));
1057 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1059 static int next_segment(unsigned long len
, int offset
)
1061 if (len
> PAGE_SIZE
- offset
)
1062 return PAGE_SIZE
- offset
;
1067 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1073 addr
= gfn_to_hva(kvm
, gfn
);
1074 if (kvm_is_error_hva(addr
))
1076 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1081 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1083 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1085 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1087 int offset
= offset_in_page(gpa
);
1090 while ((seg
= next_segment(len
, offset
)) != 0) {
1091 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1101 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1103 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1108 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1109 int offset
= offset_in_page(gpa
);
1111 addr
= gfn_to_hva(kvm
, gfn
);
1112 if (kvm_is_error_hva(addr
))
1114 pagefault_disable();
1115 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1121 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1123 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1124 int offset
, int len
)
1129 addr
= gfn_to_hva(kvm
, gfn
);
1130 if (kvm_is_error_hva(addr
))
1132 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1135 mark_page_dirty(kvm
, gfn
);
1138 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1140 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1143 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1145 int offset
= offset_in_page(gpa
);
1148 while ((seg
= next_segment(len
, offset
)) != 0) {
1149 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1160 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1162 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1164 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1166 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1168 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1170 int offset
= offset_in_page(gpa
);
1173 while ((seg
= next_segment(len
, offset
)) != 0) {
1174 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1183 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1185 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1187 struct kvm_memory_slot
*memslot
;
1189 gfn
= unalias_gfn(kvm
, gfn
);
1190 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1191 if (memslot
&& memslot
->dirty_bitmap
) {
1192 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1193 unsigned long *p
= memslot
->dirty_bitmap
+
1194 rel_gfn
/ BITS_PER_LONG
;
1195 int offset
= rel_gfn
% BITS_PER_LONG
;
1198 if (!generic_test_le_bit(offset
, p
))
1199 generic___set_le_bit(offset
, p
);
1204 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1206 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1211 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1213 if (kvm_arch_vcpu_runnable(vcpu
)) {
1214 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1217 if (kvm_cpu_has_pending_timer(vcpu
))
1219 if (signal_pending(current
))
1225 finish_wait(&vcpu
->wq
, &wait
);
1228 void kvm_resched(struct kvm_vcpu
*vcpu
)
1230 if (!need_resched())
1234 EXPORT_SYMBOL_GPL(kvm_resched
);
1236 void kvm_vcpu_on_spin(struct kvm_vcpu
*vcpu
)
1241 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1243 /* Sleep for 100 us, and hope lock-holder got scheduled */
1244 expires
= ktime_add_ns(ktime_get(), 100000UL);
1245 schedule_hrtimeout(&expires
, HRTIMER_MODE_ABS
);
1247 finish_wait(&vcpu
->wq
, &wait
);
1249 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1251 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1253 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1256 if (vmf
->pgoff
== 0)
1257 page
= virt_to_page(vcpu
->run
);
1259 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1260 page
= virt_to_page(vcpu
->arch
.pio_data
);
1262 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1263 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1264 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1267 return VM_FAULT_SIGBUS
;
1273 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1274 .fault
= kvm_vcpu_fault
,
1277 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1279 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1283 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1285 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1287 kvm_put_kvm(vcpu
->kvm
);
1291 static struct file_operations kvm_vcpu_fops
= {
1292 .release
= kvm_vcpu_release
,
1293 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1294 .compat_ioctl
= kvm_vcpu_ioctl
,
1295 .mmap
= kvm_vcpu_mmap
,
1299 * Allocates an inode for the vcpu.
1301 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1303 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1307 * Creates some virtual cpus. Good luck creating more than one.
1309 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1312 struct kvm_vcpu
*vcpu
, *v
;
1314 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1316 return PTR_ERR(vcpu
);
1318 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1320 r
= kvm_arch_vcpu_setup(vcpu
);
1324 mutex_lock(&kvm
->lock
);
1325 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1330 kvm_for_each_vcpu(r
, v
, kvm
)
1331 if (v
->vcpu_id
== id
) {
1336 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1338 /* Now it's all set up, let userspace reach it */
1340 r
= create_vcpu_fd(vcpu
);
1346 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1348 atomic_inc(&kvm
->online_vcpus
);
1350 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1351 if (kvm
->bsp_vcpu_id
== id
)
1352 kvm
->bsp_vcpu
= vcpu
;
1354 mutex_unlock(&kvm
->lock
);
1358 mutex_unlock(&kvm
->lock
);
1359 kvm_arch_vcpu_destroy(vcpu
);
1363 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1366 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1367 vcpu
->sigset_active
= 1;
1368 vcpu
->sigset
= *sigset
;
1370 vcpu
->sigset_active
= 0;
1374 static long kvm_vcpu_ioctl(struct file
*filp
,
1375 unsigned int ioctl
, unsigned long arg
)
1377 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1378 void __user
*argp
= (void __user
*)arg
;
1380 struct kvm_fpu
*fpu
= NULL
;
1381 struct kvm_sregs
*kvm_sregs
= NULL
;
1383 if (vcpu
->kvm
->mm
!= current
->mm
)
1390 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1392 case KVM_GET_REGS
: {
1393 struct kvm_regs
*kvm_regs
;
1396 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1399 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1403 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1410 case KVM_SET_REGS
: {
1411 struct kvm_regs
*kvm_regs
;
1414 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1418 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1420 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1428 case KVM_GET_SREGS
: {
1429 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1433 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1437 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1442 case KVM_SET_SREGS
: {
1443 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1448 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1450 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1456 case KVM_GET_MP_STATE
: {
1457 struct kvm_mp_state mp_state
;
1459 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1463 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1468 case KVM_SET_MP_STATE
: {
1469 struct kvm_mp_state mp_state
;
1472 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1474 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1480 case KVM_TRANSLATE
: {
1481 struct kvm_translation tr
;
1484 if (copy_from_user(&tr
, argp
, sizeof tr
))
1486 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1490 if (copy_to_user(argp
, &tr
, sizeof tr
))
1495 case KVM_SET_GUEST_DEBUG
: {
1496 struct kvm_guest_debug dbg
;
1499 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1501 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1507 case KVM_SET_SIGNAL_MASK
: {
1508 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1509 struct kvm_signal_mask kvm_sigmask
;
1510 sigset_t sigset
, *p
;
1515 if (copy_from_user(&kvm_sigmask
, argp
,
1516 sizeof kvm_sigmask
))
1519 if (kvm_sigmask
.len
!= sizeof sigset
)
1522 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1527 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1531 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1535 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1539 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1545 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1550 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1552 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1559 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1567 static long kvm_vm_ioctl(struct file
*filp
,
1568 unsigned int ioctl
, unsigned long arg
)
1570 struct kvm
*kvm
= filp
->private_data
;
1571 void __user
*argp
= (void __user
*)arg
;
1574 if (kvm
->mm
!= current
->mm
)
1577 case KVM_CREATE_VCPU
:
1578 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1582 case KVM_SET_USER_MEMORY_REGION
: {
1583 struct kvm_userspace_memory_region kvm_userspace_mem
;
1586 if (copy_from_user(&kvm_userspace_mem
, argp
,
1587 sizeof kvm_userspace_mem
))
1590 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
1595 case KVM_GET_DIRTY_LOG
: {
1596 struct kvm_dirty_log log
;
1599 if (copy_from_user(&log
, argp
, sizeof log
))
1601 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1606 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1607 case KVM_REGISTER_COALESCED_MMIO
: {
1608 struct kvm_coalesced_mmio_zone zone
;
1610 if (copy_from_user(&zone
, argp
, sizeof zone
))
1613 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
1619 case KVM_UNREGISTER_COALESCED_MMIO
: {
1620 struct kvm_coalesced_mmio_zone zone
;
1622 if (copy_from_user(&zone
, argp
, sizeof zone
))
1625 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
1633 struct kvm_irqfd data
;
1636 if (copy_from_user(&data
, argp
, sizeof data
))
1638 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
1641 case KVM_IOEVENTFD
: {
1642 struct kvm_ioeventfd data
;
1645 if (copy_from_user(&data
, argp
, sizeof data
))
1647 r
= kvm_ioeventfd(kvm
, &data
);
1650 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1651 case KVM_SET_BOOT_CPU_ID
:
1653 mutex_lock(&kvm
->lock
);
1654 if (atomic_read(&kvm
->online_vcpus
) != 0)
1657 kvm
->bsp_vcpu_id
= arg
;
1658 mutex_unlock(&kvm
->lock
);
1662 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1664 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
1670 #ifdef CONFIG_COMPAT
1671 struct compat_kvm_dirty_log
{
1675 compat_uptr_t dirty_bitmap
; /* one bit per page */
1680 static long kvm_vm_compat_ioctl(struct file
*filp
,
1681 unsigned int ioctl
, unsigned long arg
)
1683 struct kvm
*kvm
= filp
->private_data
;
1686 if (kvm
->mm
!= current
->mm
)
1689 case KVM_GET_DIRTY_LOG
: {
1690 struct compat_kvm_dirty_log compat_log
;
1691 struct kvm_dirty_log log
;
1694 if (copy_from_user(&compat_log
, (void __user
*)arg
,
1695 sizeof(compat_log
)))
1697 log
.slot
= compat_log
.slot
;
1698 log
.padding1
= compat_log
.padding1
;
1699 log
.padding2
= compat_log
.padding2
;
1700 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
1702 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1708 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
1716 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1718 struct page
*page
[1];
1721 gfn_t gfn
= vmf
->pgoff
;
1722 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1724 addr
= gfn_to_hva(kvm
, gfn
);
1725 if (kvm_is_error_hva(addr
))
1726 return VM_FAULT_SIGBUS
;
1728 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
1730 if (unlikely(npages
!= 1))
1731 return VM_FAULT_SIGBUS
;
1733 vmf
->page
= page
[0];
1737 static const struct vm_operations_struct kvm_vm_vm_ops
= {
1738 .fault
= kvm_vm_fault
,
1741 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1743 vma
->vm_ops
= &kvm_vm_vm_ops
;
1747 static struct file_operations kvm_vm_fops
= {
1748 .release
= kvm_vm_release
,
1749 .unlocked_ioctl
= kvm_vm_ioctl
,
1750 #ifdef CONFIG_COMPAT
1751 .compat_ioctl
= kvm_vm_compat_ioctl
,
1753 .mmap
= kvm_vm_mmap
,
1756 static int kvm_dev_ioctl_create_vm(void)
1761 kvm
= kvm_create_vm();
1763 return PTR_ERR(kvm
);
1764 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
1771 static long kvm_dev_ioctl_check_extension_generic(long arg
)
1774 case KVM_CAP_USER_MEMORY
:
1775 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
1776 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
1777 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1778 case KVM_CAP_SET_BOOT_CPU_ID
:
1780 case KVM_CAP_INTERNAL_ERROR_DATA
:
1782 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1783 case KVM_CAP_IRQ_ROUTING
:
1784 return KVM_MAX_IRQ_ROUTES
;
1789 return kvm_dev_ioctl_check_extension(arg
);
1792 static long kvm_dev_ioctl(struct file
*filp
,
1793 unsigned int ioctl
, unsigned long arg
)
1798 case KVM_GET_API_VERSION
:
1802 r
= KVM_API_VERSION
;
1808 r
= kvm_dev_ioctl_create_vm();
1810 case KVM_CHECK_EXTENSION
:
1811 r
= kvm_dev_ioctl_check_extension_generic(arg
);
1813 case KVM_GET_VCPU_MMAP_SIZE
:
1817 r
= PAGE_SIZE
; /* struct kvm_run */
1819 r
+= PAGE_SIZE
; /* pio data page */
1821 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1822 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
1825 case KVM_TRACE_ENABLE
:
1826 case KVM_TRACE_PAUSE
:
1827 case KVM_TRACE_DISABLE
:
1831 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1837 static struct file_operations kvm_chardev_ops
= {
1838 .unlocked_ioctl
= kvm_dev_ioctl
,
1839 .compat_ioctl
= kvm_dev_ioctl
,
1842 static struct miscdevice kvm_dev
= {
1848 static void hardware_enable(void *junk
)
1850 int cpu
= raw_smp_processor_id();
1853 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1856 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
1858 r
= kvm_arch_hardware_enable(NULL
);
1861 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1862 atomic_inc(&hardware_enable_failed
);
1863 printk(KERN_INFO
"kvm: enabling virtualization on "
1864 "CPU%d failed\n", cpu
);
1868 static void hardware_disable(void *junk
)
1870 int cpu
= raw_smp_processor_id();
1872 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1874 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1875 kvm_arch_hardware_disable(NULL
);
1878 static void hardware_disable_all_nolock(void)
1880 BUG_ON(!kvm_usage_count
);
1883 if (!kvm_usage_count
)
1884 on_each_cpu(hardware_disable
, NULL
, 1);
1887 static void hardware_disable_all(void)
1889 spin_lock(&kvm_lock
);
1890 hardware_disable_all_nolock();
1891 spin_unlock(&kvm_lock
);
1894 static int hardware_enable_all(void)
1898 spin_lock(&kvm_lock
);
1901 if (kvm_usage_count
== 1) {
1902 atomic_set(&hardware_enable_failed
, 0);
1903 on_each_cpu(hardware_enable
, NULL
, 1);
1905 if (atomic_read(&hardware_enable_failed
)) {
1906 hardware_disable_all_nolock();
1911 spin_unlock(&kvm_lock
);
1916 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1921 if (!kvm_usage_count
)
1924 val
&= ~CPU_TASKS_FROZEN
;
1927 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1929 hardware_disable(NULL
);
1931 case CPU_UP_CANCELED
:
1932 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1934 smp_call_function_single(cpu
, hardware_disable
, NULL
, 1);
1937 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1939 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
1946 asmlinkage
void kvm_handle_fault_on_reboot(void)
1949 /* spin while reset goes on */
1952 /* Fault while not rebooting. We want the trace. */
1955 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
1957 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1961 * Some (well, at least mine) BIOSes hang on reboot if
1964 * And Intel TXT required VMX off for all cpu when system shutdown.
1966 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1967 kvm_rebooting
= true;
1968 on_each_cpu(hardware_disable
, NULL
, 1);
1972 static struct notifier_block kvm_reboot_notifier
= {
1973 .notifier_call
= kvm_reboot
,
1977 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
1981 for (i
= 0; i
< bus
->dev_count
; i
++) {
1982 struct kvm_io_device
*pos
= bus
->devs
[i
];
1984 kvm_iodevice_destructor(pos
);
1989 /* kvm_io_bus_write - called under kvm->slots_lock */
1990 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
1991 int len
, const void *val
)
1994 struct kvm_io_bus
*bus
= rcu_dereference(kvm
->buses
[bus_idx
]);
1995 for (i
= 0; i
< bus
->dev_count
; i
++)
1996 if (!kvm_iodevice_write(bus
->devs
[i
], addr
, len
, val
))
2001 /* kvm_io_bus_read - called under kvm->slots_lock */
2002 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2006 struct kvm_io_bus
*bus
= rcu_dereference(kvm
->buses
[bus_idx
]);
2008 for (i
= 0; i
< bus
->dev_count
; i
++)
2009 if (!kvm_iodevice_read(bus
->devs
[i
], addr
, len
, val
))
2014 /* Caller must hold slots_lock. */
2015 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2016 struct kvm_io_device
*dev
)
2018 struct kvm_io_bus
*new_bus
, *bus
;
2020 bus
= kvm
->buses
[bus_idx
];
2021 if (bus
->dev_count
> NR_IOBUS_DEVS
-1)
2024 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2027 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2028 new_bus
->devs
[new_bus
->dev_count
++] = dev
;
2029 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2030 synchronize_srcu_expedited(&kvm
->srcu
);
2036 /* Caller must hold slots_lock. */
2037 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2038 struct kvm_io_device
*dev
)
2041 struct kvm_io_bus
*new_bus
, *bus
;
2043 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2047 bus
= kvm
->buses
[bus_idx
];
2048 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2051 for (i
= 0; i
< new_bus
->dev_count
; i
++)
2052 if (new_bus
->devs
[i
] == dev
) {
2054 new_bus
->devs
[i
] = new_bus
->devs
[--new_bus
->dev_count
];
2063 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2064 synchronize_srcu_expedited(&kvm
->srcu
);
2069 static struct notifier_block kvm_cpu_notifier
= {
2070 .notifier_call
= kvm_cpu_hotplug
,
2071 .priority
= 20, /* must be > scheduler priority */
2074 static int vm_stat_get(void *_offset
, u64
*val
)
2076 unsigned offset
= (long)_offset
;
2080 spin_lock(&kvm_lock
);
2081 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2082 *val
+= *(u32
*)((void *)kvm
+ offset
);
2083 spin_unlock(&kvm_lock
);
2087 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2089 static int vcpu_stat_get(void *_offset
, u64
*val
)
2091 unsigned offset
= (long)_offset
;
2093 struct kvm_vcpu
*vcpu
;
2097 spin_lock(&kvm_lock
);
2098 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2099 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2100 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2102 spin_unlock(&kvm_lock
);
2106 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2108 static const struct file_operations
*stat_fops
[] = {
2109 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2110 [KVM_STAT_VM
] = &vm_stat_fops
,
2113 static void kvm_init_debug(void)
2115 struct kvm_stats_debugfs_item
*p
;
2117 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2118 for (p
= debugfs_entries
; p
->name
; ++p
)
2119 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2120 (void *)(long)p
->offset
,
2121 stat_fops
[p
->kind
]);
2124 static void kvm_exit_debug(void)
2126 struct kvm_stats_debugfs_item
*p
;
2128 for (p
= debugfs_entries
; p
->name
; ++p
)
2129 debugfs_remove(p
->dentry
);
2130 debugfs_remove(kvm_debugfs_dir
);
2133 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2135 if (kvm_usage_count
)
2136 hardware_disable(NULL
);
2140 static int kvm_resume(struct sys_device
*dev
)
2142 if (kvm_usage_count
)
2143 hardware_enable(NULL
);
2147 static struct sysdev_class kvm_sysdev_class
= {
2149 .suspend
= kvm_suspend
,
2150 .resume
= kvm_resume
,
2153 static struct sys_device kvm_sysdev
= {
2155 .cls
= &kvm_sysdev_class
,
2158 struct page
*bad_page
;
2162 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2164 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2167 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2169 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2171 kvm_arch_vcpu_load(vcpu
, cpu
);
2174 static void kvm_sched_out(struct preempt_notifier
*pn
,
2175 struct task_struct
*next
)
2177 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2179 kvm_arch_vcpu_put(vcpu
);
2182 int kvm_init(void *opaque
, unsigned int vcpu_size
,
2183 struct module
*module
)
2188 r
= kvm_arch_init(opaque
);
2192 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2194 if (bad_page
== NULL
) {
2199 bad_pfn
= page_to_pfn(bad_page
);
2201 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2206 r
= kvm_arch_hardware_setup();
2210 for_each_online_cpu(cpu
) {
2211 smp_call_function_single(cpu
,
2212 kvm_arch_check_processor_compat
,
2218 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2221 register_reboot_notifier(&kvm_reboot_notifier
);
2223 r
= sysdev_class_register(&kvm_sysdev_class
);
2227 r
= sysdev_register(&kvm_sysdev
);
2231 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2232 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
2233 __alignof__(struct kvm_vcpu
),
2235 if (!kvm_vcpu_cache
) {
2240 kvm_chardev_ops
.owner
= module
;
2241 kvm_vm_fops
.owner
= module
;
2242 kvm_vcpu_fops
.owner
= module
;
2244 r
= misc_register(&kvm_dev
);
2246 printk(KERN_ERR
"kvm: misc device register failed\n");
2250 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2251 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2258 kmem_cache_destroy(kvm_vcpu_cache
);
2260 sysdev_unregister(&kvm_sysdev
);
2262 sysdev_class_unregister(&kvm_sysdev_class
);
2264 unregister_reboot_notifier(&kvm_reboot_notifier
);
2265 unregister_cpu_notifier(&kvm_cpu_notifier
);
2268 kvm_arch_hardware_unsetup();
2270 free_cpumask_var(cpus_hardware_enabled
);
2272 __free_page(bad_page
);
2278 EXPORT_SYMBOL_GPL(kvm_init
);
2282 tracepoint_synchronize_unregister();
2284 misc_deregister(&kvm_dev
);
2285 kmem_cache_destroy(kvm_vcpu_cache
);
2286 sysdev_unregister(&kvm_sysdev
);
2287 sysdev_class_unregister(&kvm_sysdev_class
);
2288 unregister_reboot_notifier(&kvm_reboot_notifier
);
2289 unregister_cpu_notifier(&kvm_cpu_notifier
);
2290 on_each_cpu(hardware_disable
, NULL
, 1);
2291 kvm_arch_hardware_unsetup();
2293 free_cpumask_var(cpus_hardware_enabled
);
2294 __free_page(bad_page
);
2296 EXPORT_SYMBOL_GPL(kvm_exit
);