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>
25 #include <linux/gfp.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/sysdev.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>
44 #include <asm/processor.h>
46 #include <asm/uaccess.h>
47 #include <asm/pgtable.h>
49 MODULE_AUTHOR("Qumranet");
50 MODULE_LICENSE("GPL");
52 DEFINE_SPINLOCK(kvm_lock
);
55 static cpumask_t cpus_hardware_enabled
;
57 struct kmem_cache
*kvm_vcpu_cache
;
58 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
60 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
62 static struct dentry
*debugfs_dir
;
64 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
67 static inline int valid_vcpu(int n
)
69 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
73 * Switches to specified vcpu, until a matching vcpu_put()
75 void vcpu_load(struct kvm_vcpu
*vcpu
)
79 mutex_lock(&vcpu
->mutex
);
81 preempt_notifier_register(&vcpu
->preempt_notifier
);
82 kvm_arch_vcpu_load(vcpu
, cpu
);
86 void vcpu_put(struct kvm_vcpu
*vcpu
)
89 kvm_arch_vcpu_put(vcpu
);
90 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
92 mutex_unlock(&vcpu
->mutex
);
95 static void ack_flush(void *_completed
)
99 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
103 struct kvm_vcpu
*vcpu
;
106 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
107 vcpu
= kvm
->vcpus
[i
];
110 if (test_and_set_bit(KVM_REQ_TLB_FLUSH
, &vcpu
->requests
))
113 if (cpu
!= -1 && cpu
!= raw_smp_processor_id())
116 if (cpus_empty(cpus
))
118 ++kvm
->stat
.remote_tlb_flush
;
119 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
122 void kvm_reload_remote_mmus(struct kvm
*kvm
)
126 struct kvm_vcpu
*vcpu
;
129 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
130 vcpu
= kvm
->vcpus
[i
];
133 if (test_and_set_bit(KVM_REQ_MMU_RELOAD
, &vcpu
->requests
))
136 if (cpu
!= -1 && cpu
!= raw_smp_processor_id())
139 if (cpus_empty(cpus
))
141 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
145 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
150 mutex_init(&vcpu
->mutex
);
154 init_waitqueue_head(&vcpu
->wq
);
156 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
161 vcpu
->run
= page_address(page
);
163 r
= kvm_arch_vcpu_init(vcpu
);
169 free_page((unsigned long)vcpu
->run
);
173 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
175 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
177 kvm_arch_vcpu_uninit(vcpu
);
178 free_page((unsigned long)vcpu
->run
);
180 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
182 static struct kvm
*kvm_create_vm(void)
184 struct kvm
*kvm
= kvm_arch_create_vm();
189 kvm
->mm
= current
->mm
;
190 atomic_inc(&kvm
->mm
->mm_count
);
191 spin_lock_init(&kvm
->mmu_lock
);
192 kvm_io_bus_init(&kvm
->pio_bus
);
193 mutex_init(&kvm
->lock
);
194 kvm_io_bus_init(&kvm
->mmio_bus
);
195 init_rwsem(&kvm
->slots_lock
);
196 spin_lock(&kvm_lock
);
197 list_add(&kvm
->vm_list
, &vm_list
);
198 spin_unlock(&kvm_lock
);
204 * Free any memory in @free but not in @dont.
206 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
207 struct kvm_memory_slot
*dont
)
209 if (!dont
|| free
->rmap
!= dont
->rmap
)
212 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
213 vfree(free
->dirty_bitmap
);
215 if (!dont
|| free
->lpage_info
!= dont
->lpage_info
)
216 vfree(free
->lpage_info
);
219 free
->dirty_bitmap
= NULL
;
221 free
->lpage_info
= NULL
;
224 void kvm_free_physmem(struct kvm
*kvm
)
228 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
229 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
232 static void kvm_destroy_vm(struct kvm
*kvm
)
234 struct mm_struct
*mm
= kvm
->mm
;
236 spin_lock(&kvm_lock
);
237 list_del(&kvm
->vm_list
);
238 spin_unlock(&kvm_lock
);
239 kvm_io_bus_destroy(&kvm
->pio_bus
);
240 kvm_io_bus_destroy(&kvm
->mmio_bus
);
241 kvm_arch_destroy_vm(kvm
);
245 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
247 struct kvm
*kvm
= filp
->private_data
;
254 * Allocate some memory and give it an address in the guest physical address
257 * Discontiguous memory is allowed, mostly for framebuffers.
259 * Must be called holding mmap_sem for write.
261 int __kvm_set_memory_region(struct kvm
*kvm
,
262 struct kvm_userspace_memory_region
*mem
,
267 unsigned long npages
;
269 struct kvm_memory_slot
*memslot
;
270 struct kvm_memory_slot old
, new;
273 /* General sanity checks */
274 if (mem
->memory_size
& (PAGE_SIZE
- 1))
276 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
278 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
280 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
283 memslot
= &kvm
->memslots
[mem
->slot
];
284 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
285 npages
= mem
->memory_size
>> PAGE_SHIFT
;
288 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
290 new = old
= *memslot
;
292 new.base_gfn
= base_gfn
;
294 new.flags
= mem
->flags
;
296 /* Disallow changing a memory slot's size. */
298 if (npages
&& old
.npages
&& npages
!= old
.npages
)
301 /* Check for overlaps */
303 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
304 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
308 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
309 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
313 /* Free page dirty bitmap if unneeded */
314 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
315 new.dirty_bitmap
= NULL
;
319 /* Allocate if a slot is being created */
320 if (npages
&& !new.rmap
) {
321 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
326 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
328 new.user_alloc
= user_alloc
;
329 new.userspace_addr
= mem
->userspace_addr
;
331 if (npages
&& !new.lpage_info
) {
332 int largepages
= npages
/ KVM_PAGES_PER_HPAGE
;
333 if (npages
% KVM_PAGES_PER_HPAGE
)
335 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
338 new.lpage_info
= vmalloc(largepages
* sizeof(*new.lpage_info
));
343 memset(new.lpage_info
, 0, largepages
* sizeof(*new.lpage_info
));
345 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
346 new.lpage_info
[0].write_count
= 1;
347 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE
)
348 new.lpage_info
[largepages
-1].write_count
= 1;
351 /* Allocate page dirty bitmap if needed */
352 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
353 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
355 new.dirty_bitmap
= vmalloc(dirty_bytes
);
356 if (!new.dirty_bitmap
)
358 memset(new.dirty_bitmap
, 0, dirty_bytes
);
361 if (mem
->slot
>= kvm
->nmemslots
)
362 kvm
->nmemslots
= mem
->slot
+ 1;
366 r
= kvm_arch_set_memory_region(kvm
, mem
, old
, user_alloc
);
372 kvm_free_physmem_slot(&old
, &new);
376 kvm_free_physmem_slot(&new, &old
);
381 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
383 int kvm_set_memory_region(struct kvm
*kvm
,
384 struct kvm_userspace_memory_region
*mem
,
389 down_write(&kvm
->slots_lock
);
390 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
391 up_write(&kvm
->slots_lock
);
394 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
396 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
398 kvm_userspace_memory_region
*mem
,
401 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
403 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
406 int kvm_get_dirty_log(struct kvm
*kvm
,
407 struct kvm_dirty_log
*log
, int *is_dirty
)
409 struct kvm_memory_slot
*memslot
;
412 unsigned long any
= 0;
415 if (log
->slot
>= KVM_MEMORY_SLOTS
)
418 memslot
= &kvm
->memslots
[log
->slot
];
420 if (!memslot
->dirty_bitmap
)
423 n
= ALIGN(memslot
->npages
, BITS_PER_LONG
) / 8;
425 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
426 any
= memslot
->dirty_bitmap
[i
];
429 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
440 int is_error_page(struct page
*page
)
442 return page
== bad_page
;
444 EXPORT_SYMBOL_GPL(is_error_page
);
446 static inline unsigned long bad_hva(void)
451 int kvm_is_error_hva(unsigned long addr
)
453 return addr
== bad_hva();
455 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
457 static struct kvm_memory_slot
*__gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
461 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
462 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
464 if (gfn
>= memslot
->base_gfn
465 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
471 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
473 gfn
= unalias_gfn(kvm
, gfn
);
474 return __gfn_to_memslot(kvm
, gfn
);
477 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
481 gfn
= unalias_gfn(kvm
, gfn
);
482 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
483 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
485 if (gfn
>= memslot
->base_gfn
486 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
491 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
493 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
495 struct kvm_memory_slot
*slot
;
497 gfn
= unalias_gfn(kvm
, gfn
);
498 slot
= __gfn_to_memslot(kvm
, gfn
);
501 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
505 * Requires current->mm->mmap_sem to be held
507 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
509 struct page
*page
[1];
515 addr
= gfn_to_hva(kvm
, gfn
);
516 if (kvm_is_error_hva(addr
)) {
521 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 1, page
,
532 EXPORT_SYMBOL_GPL(gfn_to_page
);
534 void kvm_release_page_clean(struct page
*page
)
538 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
540 void kvm_release_page_dirty(struct page
*page
)
542 if (!PageReserved(page
))
546 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
548 static int next_segment(unsigned long len
, int offset
)
550 if (len
> PAGE_SIZE
- offset
)
551 return PAGE_SIZE
- offset
;
556 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
562 addr
= gfn_to_hva(kvm
, gfn
);
563 if (kvm_is_error_hva(addr
))
565 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
570 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
572 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
574 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
576 int offset
= offset_in_page(gpa
);
579 while ((seg
= next_segment(len
, offset
)) != 0) {
580 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
590 EXPORT_SYMBOL_GPL(kvm_read_guest
);
592 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
597 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
598 int offset
= offset_in_page(gpa
);
600 addr
= gfn_to_hva(kvm
, gfn
);
601 if (kvm_is_error_hva(addr
))
604 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
610 EXPORT_SYMBOL(kvm_read_guest_atomic
);
612 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
618 addr
= gfn_to_hva(kvm
, gfn
);
619 if (kvm_is_error_hva(addr
))
621 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
624 mark_page_dirty(kvm
, gfn
);
627 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
629 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
632 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
634 int offset
= offset_in_page(gpa
);
637 while ((seg
= next_segment(len
, offset
)) != 0) {
638 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
649 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
651 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
653 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
655 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
657 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
659 int offset
= offset_in_page(gpa
);
662 while ((seg
= next_segment(len
, offset
)) != 0) {
663 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
672 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
674 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
676 struct kvm_memory_slot
*memslot
;
678 gfn
= unalias_gfn(kvm
, gfn
);
679 memslot
= __gfn_to_memslot(kvm
, gfn
);
680 if (memslot
&& memslot
->dirty_bitmap
) {
681 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
684 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
685 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
690 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
692 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
694 DECLARE_WAITQUEUE(wait
, current
);
696 add_wait_queue(&vcpu
->wq
, &wait
);
699 * We will block until either an interrupt or a signal wakes us up
701 while (!kvm_cpu_has_interrupt(vcpu
)
702 && !signal_pending(current
)
703 && !kvm_arch_vcpu_runnable(vcpu
)) {
704 set_current_state(TASK_INTERRUPTIBLE
);
710 __set_current_state(TASK_RUNNING
);
711 remove_wait_queue(&vcpu
->wq
, &wait
);
714 void kvm_resched(struct kvm_vcpu
*vcpu
)
720 EXPORT_SYMBOL_GPL(kvm_resched
);
722 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
724 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
728 page
= virt_to_page(vcpu
->run
);
730 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
731 page
= virt_to_page(vcpu
->arch
.pio_data
);
734 return VM_FAULT_SIGBUS
;
740 static struct vm_operations_struct kvm_vcpu_vm_ops
= {
741 .fault
= kvm_vcpu_fault
,
744 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
746 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
750 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
752 struct kvm_vcpu
*vcpu
= filp
->private_data
;
754 fput(vcpu
->kvm
->filp
);
758 static const struct file_operations kvm_vcpu_fops
= {
759 .release
= kvm_vcpu_release
,
760 .unlocked_ioctl
= kvm_vcpu_ioctl
,
761 .compat_ioctl
= kvm_vcpu_ioctl
,
762 .mmap
= kvm_vcpu_mmap
,
766 * Allocates an inode for the vcpu.
768 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
774 r
= anon_inode_getfd(&fd
, &inode
, &file
,
775 "kvm-vcpu", &kvm_vcpu_fops
, vcpu
);
778 atomic_inc(&vcpu
->kvm
->filp
->f_count
);
783 * Creates some virtual cpus. Good luck creating more than one.
785 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
788 struct kvm_vcpu
*vcpu
;
793 vcpu
= kvm_arch_vcpu_create(kvm
, n
);
795 return PTR_ERR(vcpu
);
797 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
799 r
= kvm_arch_vcpu_setup(vcpu
);
803 mutex_lock(&kvm
->lock
);
806 mutex_unlock(&kvm
->lock
);
809 kvm
->vcpus
[n
] = vcpu
;
810 mutex_unlock(&kvm
->lock
);
812 /* Now it's all set up, let userspace reach it */
813 r
= create_vcpu_fd(vcpu
);
819 mutex_lock(&kvm
->lock
);
820 kvm
->vcpus
[n
] = NULL
;
821 mutex_unlock(&kvm
->lock
);
823 kvm_arch_vcpu_destroy(vcpu
);
827 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
830 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
831 vcpu
->sigset_active
= 1;
832 vcpu
->sigset
= *sigset
;
834 vcpu
->sigset_active
= 0;
838 static long kvm_vcpu_ioctl(struct file
*filp
,
839 unsigned int ioctl
, unsigned long arg
)
841 struct kvm_vcpu
*vcpu
= filp
->private_data
;
842 void __user
*argp
= (void __user
*)arg
;
845 if (vcpu
->kvm
->mm
!= current
->mm
)
852 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
855 struct kvm_regs kvm_regs
;
857 memset(&kvm_regs
, 0, sizeof kvm_regs
);
858 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, &kvm_regs
);
862 if (copy_to_user(argp
, &kvm_regs
, sizeof kvm_regs
))
868 struct kvm_regs kvm_regs
;
871 if (copy_from_user(&kvm_regs
, argp
, sizeof kvm_regs
))
873 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, &kvm_regs
);
879 case KVM_GET_SREGS
: {
880 struct kvm_sregs kvm_sregs
;
882 memset(&kvm_sregs
, 0, sizeof kvm_sregs
);
883 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, &kvm_sregs
);
887 if (copy_to_user(argp
, &kvm_sregs
, sizeof kvm_sregs
))
892 case KVM_SET_SREGS
: {
893 struct kvm_sregs kvm_sregs
;
896 if (copy_from_user(&kvm_sregs
, argp
, sizeof kvm_sregs
))
898 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, &kvm_sregs
);
904 case KVM_TRANSLATE
: {
905 struct kvm_translation tr
;
908 if (copy_from_user(&tr
, argp
, sizeof tr
))
910 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
914 if (copy_to_user(argp
, &tr
, sizeof tr
))
919 case KVM_DEBUG_GUEST
: {
920 struct kvm_debug_guest dbg
;
923 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
925 r
= kvm_arch_vcpu_ioctl_debug_guest(vcpu
, &dbg
);
931 case KVM_SET_SIGNAL_MASK
: {
932 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
933 struct kvm_signal_mask kvm_sigmask
;
939 if (copy_from_user(&kvm_sigmask
, argp
,
943 if (kvm_sigmask
.len
!= sizeof sigset
)
946 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
951 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
957 memset(&fpu
, 0, sizeof fpu
);
958 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, &fpu
);
962 if (copy_to_user(argp
, &fpu
, sizeof fpu
))
971 if (copy_from_user(&fpu
, argp
, sizeof fpu
))
973 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, &fpu
);
980 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
986 static long kvm_vm_ioctl(struct file
*filp
,
987 unsigned int ioctl
, unsigned long arg
)
989 struct kvm
*kvm
= filp
->private_data
;
990 void __user
*argp
= (void __user
*)arg
;
993 if (kvm
->mm
!= current
->mm
)
996 case KVM_CREATE_VCPU
:
997 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1001 case KVM_SET_USER_MEMORY_REGION
: {
1002 struct kvm_userspace_memory_region kvm_userspace_mem
;
1005 if (copy_from_user(&kvm_userspace_mem
, argp
,
1006 sizeof kvm_userspace_mem
))
1009 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
1014 case KVM_GET_DIRTY_LOG
: {
1015 struct kvm_dirty_log log
;
1018 if (copy_from_user(&log
, argp
, sizeof log
))
1020 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1026 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1032 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1034 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1037 if (!kvm_is_visible_gfn(kvm
, vmf
->pgoff
))
1038 return VM_FAULT_SIGBUS
;
1039 page
= gfn_to_page(kvm
, vmf
->pgoff
);
1040 if (is_error_page(page
)) {
1041 kvm_release_page_clean(page
);
1042 return VM_FAULT_SIGBUS
;
1048 static struct vm_operations_struct kvm_vm_vm_ops
= {
1049 .fault
= kvm_vm_fault
,
1052 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1054 vma
->vm_ops
= &kvm_vm_vm_ops
;
1058 static const struct file_operations kvm_vm_fops
= {
1059 .release
= kvm_vm_release
,
1060 .unlocked_ioctl
= kvm_vm_ioctl
,
1061 .compat_ioctl
= kvm_vm_ioctl
,
1062 .mmap
= kvm_vm_mmap
,
1065 static int kvm_dev_ioctl_create_vm(void)
1068 struct inode
*inode
;
1072 kvm
= kvm_create_vm();
1074 return PTR_ERR(kvm
);
1075 r
= anon_inode_getfd(&fd
, &inode
, &file
, "kvm-vm", &kvm_vm_fops
, kvm
);
1077 kvm_destroy_vm(kvm
);
1086 static long kvm_dev_ioctl(struct file
*filp
,
1087 unsigned int ioctl
, unsigned long arg
)
1089 void __user
*argp
= (void __user
*)arg
;
1093 case KVM_GET_API_VERSION
:
1097 r
= KVM_API_VERSION
;
1103 r
= kvm_dev_ioctl_create_vm();
1105 case KVM_CHECK_EXTENSION
:
1106 r
= kvm_dev_ioctl_check_extension((long)argp
);
1108 case KVM_GET_VCPU_MMAP_SIZE
:
1112 r
= PAGE_SIZE
; /* struct kvm_run */
1114 r
+= PAGE_SIZE
; /* pio data page */
1118 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1124 static struct file_operations kvm_chardev_ops
= {
1125 .unlocked_ioctl
= kvm_dev_ioctl
,
1126 .compat_ioctl
= kvm_dev_ioctl
,
1129 static struct miscdevice kvm_dev
= {
1135 static void hardware_enable(void *junk
)
1137 int cpu
= raw_smp_processor_id();
1139 if (cpu_isset(cpu
, cpus_hardware_enabled
))
1141 cpu_set(cpu
, cpus_hardware_enabled
);
1142 kvm_arch_hardware_enable(NULL
);
1145 static void hardware_disable(void *junk
)
1147 int cpu
= raw_smp_processor_id();
1149 if (!cpu_isset(cpu
, cpus_hardware_enabled
))
1151 cpu_clear(cpu
, cpus_hardware_enabled
);
1152 decache_vcpus_on_cpu(cpu
);
1153 kvm_arch_hardware_disable(NULL
);
1156 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1161 val
&= ~CPU_TASKS_FROZEN
;
1164 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1166 hardware_disable(NULL
);
1168 case CPU_UP_CANCELED
:
1169 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1171 smp_call_function_single(cpu
, hardware_disable
, NULL
, 0, 1);
1174 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1176 smp_call_function_single(cpu
, hardware_enable
, NULL
, 0, 1);
1182 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1185 if (val
== SYS_RESTART
) {
1187 * Some (well, at least mine) BIOSes hang on reboot if
1190 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1191 on_each_cpu(hardware_disable
, NULL
, 0, 1);
1196 static struct notifier_block kvm_reboot_notifier
= {
1197 .notifier_call
= kvm_reboot
,
1201 void kvm_io_bus_init(struct kvm_io_bus
*bus
)
1203 memset(bus
, 0, sizeof(*bus
));
1206 void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
1210 for (i
= 0; i
< bus
->dev_count
; i
++) {
1211 struct kvm_io_device
*pos
= bus
->devs
[i
];
1213 kvm_iodevice_destructor(pos
);
1217 struct kvm_io_device
*kvm_io_bus_find_dev(struct kvm_io_bus
*bus
, gpa_t addr
)
1221 for (i
= 0; i
< bus
->dev_count
; i
++) {
1222 struct kvm_io_device
*pos
= bus
->devs
[i
];
1224 if (pos
->in_range(pos
, addr
))
1231 void kvm_io_bus_register_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
)
1233 BUG_ON(bus
->dev_count
> (NR_IOBUS_DEVS
-1));
1235 bus
->devs
[bus
->dev_count
++] = dev
;
1238 static struct notifier_block kvm_cpu_notifier
= {
1239 .notifier_call
= kvm_cpu_hotplug
,
1240 .priority
= 20, /* must be > scheduler priority */
1243 static int vm_stat_get(void *_offset
, u64
*val
)
1245 unsigned offset
= (long)_offset
;
1249 spin_lock(&kvm_lock
);
1250 list_for_each_entry(kvm
, &vm_list
, vm_list
)
1251 *val
+= *(u32
*)((void *)kvm
+ offset
);
1252 spin_unlock(&kvm_lock
);
1256 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
1258 static int vcpu_stat_get(void *_offset
, u64
*val
)
1260 unsigned offset
= (long)_offset
;
1262 struct kvm_vcpu
*vcpu
;
1266 spin_lock(&kvm_lock
);
1267 list_for_each_entry(kvm
, &vm_list
, vm_list
)
1268 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
1269 vcpu
= kvm
->vcpus
[i
];
1271 *val
+= *(u32
*)((void *)vcpu
+ offset
);
1273 spin_unlock(&kvm_lock
);
1277 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
1279 static struct file_operations
*stat_fops
[] = {
1280 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
1281 [KVM_STAT_VM
] = &vm_stat_fops
,
1284 static void kvm_init_debug(void)
1286 struct kvm_stats_debugfs_item
*p
;
1288 debugfs_dir
= debugfs_create_dir("kvm", NULL
);
1289 for (p
= debugfs_entries
; p
->name
; ++p
)
1290 p
->dentry
= debugfs_create_file(p
->name
, 0444, debugfs_dir
,
1291 (void *)(long)p
->offset
,
1292 stat_fops
[p
->kind
]);
1295 static void kvm_exit_debug(void)
1297 struct kvm_stats_debugfs_item
*p
;
1299 for (p
= debugfs_entries
; p
->name
; ++p
)
1300 debugfs_remove(p
->dentry
);
1301 debugfs_remove(debugfs_dir
);
1304 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
1306 hardware_disable(NULL
);
1310 static int kvm_resume(struct sys_device
*dev
)
1312 hardware_enable(NULL
);
1316 static struct sysdev_class kvm_sysdev_class
= {
1318 .suspend
= kvm_suspend
,
1319 .resume
= kvm_resume
,
1322 static struct sys_device kvm_sysdev
= {
1324 .cls
= &kvm_sysdev_class
,
1327 struct page
*bad_page
;
1330 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
1332 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
1335 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
1337 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
1339 kvm_arch_vcpu_load(vcpu
, cpu
);
1342 static void kvm_sched_out(struct preempt_notifier
*pn
,
1343 struct task_struct
*next
)
1345 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
1347 kvm_arch_vcpu_put(vcpu
);
1350 int kvm_init(void *opaque
, unsigned int vcpu_size
,
1351 struct module
*module
)
1358 r
= kvm_arch_init(opaque
);
1362 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
1364 if (bad_page
== NULL
) {
1369 r
= kvm_arch_hardware_setup();
1373 for_each_online_cpu(cpu
) {
1374 smp_call_function_single(cpu
,
1375 kvm_arch_check_processor_compat
,
1381 on_each_cpu(hardware_enable
, NULL
, 0, 1);
1382 r
= register_cpu_notifier(&kvm_cpu_notifier
);
1385 register_reboot_notifier(&kvm_reboot_notifier
);
1387 r
= sysdev_class_register(&kvm_sysdev_class
);
1391 r
= sysdev_register(&kvm_sysdev
);
1395 /* A kmem cache lets us meet the alignment requirements of fx_save. */
1396 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
1397 __alignof__(struct kvm_vcpu
),
1399 if (!kvm_vcpu_cache
) {
1404 kvm_chardev_ops
.owner
= module
;
1406 r
= misc_register(&kvm_dev
);
1408 printk(KERN_ERR
"kvm: misc device register failed\n");
1412 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
1413 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
1418 kmem_cache_destroy(kvm_vcpu_cache
);
1420 sysdev_unregister(&kvm_sysdev
);
1422 sysdev_class_unregister(&kvm_sysdev_class
);
1424 unregister_reboot_notifier(&kvm_reboot_notifier
);
1425 unregister_cpu_notifier(&kvm_cpu_notifier
);
1427 on_each_cpu(hardware_disable
, NULL
, 0, 1);
1429 kvm_arch_hardware_unsetup();
1431 __free_page(bad_page
);
1438 EXPORT_SYMBOL_GPL(kvm_init
);
1442 misc_deregister(&kvm_dev
);
1443 kmem_cache_destroy(kvm_vcpu_cache
);
1444 sysdev_unregister(&kvm_sysdev
);
1445 sysdev_class_unregister(&kvm_sysdev_class
);
1446 unregister_reboot_notifier(&kvm_reboot_notifier
);
1447 unregister_cpu_notifier(&kvm_cpu_notifier
);
1448 on_each_cpu(hardware_disable
, NULL
, 0, 1);
1449 kvm_arch_hardware_unsetup();
1452 __free_page(bad_page
);
1454 EXPORT_SYMBOL_GPL(kvm_exit
);