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.h>
21 #include <linux/module.h>
22 #include <linux/errno.h>
23 #include <asm/processor.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
28 #include <linux/miscdevice.h>
29 #include <linux/vmalloc.h>
30 #include <asm/uaccess.h>
31 #include <linux/reboot.h>
33 #include <linux/debugfs.h>
34 #include <linux/highmem.h>
35 #include <linux/file.h>
38 #include "x86_emulate.h"
39 #include "segment_descriptor.h"
41 MODULE_AUTHOR("Qumranet");
42 MODULE_LICENSE("GPL");
44 struct kvm_arch_ops
*kvm_arch_ops
;
45 struct kvm_stat kvm_stat
;
46 EXPORT_SYMBOL_GPL(kvm_stat
);
48 static struct kvm_stats_debugfs_item
{
51 struct dentry
*dentry
;
52 } debugfs_entries
[] = {
53 { "pf_fixed", &kvm_stat
.pf_fixed
},
54 { "pf_guest", &kvm_stat
.pf_guest
},
55 { "tlb_flush", &kvm_stat
.tlb_flush
},
56 { "invlpg", &kvm_stat
.invlpg
},
57 { "exits", &kvm_stat
.exits
},
58 { "io_exits", &kvm_stat
.io_exits
},
59 { "mmio_exits", &kvm_stat
.mmio_exits
},
60 { "signal_exits", &kvm_stat
.signal_exits
},
61 { "irq_exits", &kvm_stat
.irq_exits
},
65 static struct dentry
*debugfs_dir
;
67 #define MAX_IO_MSRS 256
69 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
70 #define LMSW_GUEST_MASK 0x0eULL
71 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
72 #define CR8_RESEVED_BITS (~0x0fULL)
73 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
76 // LDT or TSS descriptor in the GDT. 16 bytes.
77 struct segment_descriptor_64
{
78 struct segment_descriptor s
;
85 unsigned long segment_base(u16 selector
)
87 struct descriptor_table gdt
;
88 struct segment_descriptor
*d
;
89 unsigned long table_base
;
90 typedef unsigned long ul
;
96 asm ("sgdt %0" : "=m"(gdt
));
97 table_base
= gdt
.base
;
99 if (selector
& 4) { /* from ldt */
102 asm ("sldt %0" : "=g"(ldt_selector
));
103 table_base
= segment_base(ldt_selector
);
105 d
= (struct segment_descriptor
*)(table_base
+ (selector
& ~7));
106 v
= d
->base_low
| ((ul
)d
->base_mid
<< 16) | ((ul
)d
->base_high
<< 24);
109 && (d
->type
== 2 || d
->type
== 9 || d
->type
== 11))
110 v
|= ((ul
)((struct segment_descriptor_64
*)d
)->base_higher
) << 32;
114 EXPORT_SYMBOL_GPL(segment_base
);
116 static inline int valid_vcpu(int n
)
118 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
121 int kvm_read_guest(struct kvm_vcpu
*vcpu
,
126 unsigned char *host_buf
= dest
;
127 unsigned long req_size
= size
;
135 paddr
= gva_to_hpa(vcpu
, addr
);
137 if (is_error_hpa(paddr
))
140 guest_buf
= (hva_t
)kmap_atomic(
141 pfn_to_page(paddr
>> PAGE_SHIFT
),
143 offset
= addr
& ~PAGE_MASK
;
145 now
= min(size
, PAGE_SIZE
- offset
);
146 memcpy(host_buf
, (void*)guest_buf
, now
);
150 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
152 return req_size
- size
;
154 EXPORT_SYMBOL_GPL(kvm_read_guest
);
156 int kvm_write_guest(struct kvm_vcpu
*vcpu
,
161 unsigned char *host_buf
= data
;
162 unsigned long req_size
= size
;
170 paddr
= gva_to_hpa(vcpu
, addr
);
172 if (is_error_hpa(paddr
))
175 guest_buf
= (hva_t
)kmap_atomic(
176 pfn_to_page(paddr
>> PAGE_SHIFT
), KM_USER0
);
177 offset
= addr
& ~PAGE_MASK
;
179 now
= min(size
, PAGE_SIZE
- offset
);
180 memcpy((void*)guest_buf
, host_buf
, now
);
184 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
186 return req_size
- size
;
188 EXPORT_SYMBOL_GPL(kvm_write_guest
);
190 static int vcpu_slot(struct kvm_vcpu
*vcpu
)
192 return vcpu
- vcpu
->kvm
->vcpus
;
196 * Switches to specified vcpu, until a matching vcpu_put()
198 static struct kvm_vcpu
*vcpu_load(struct kvm
*kvm
, int vcpu_slot
)
200 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[vcpu_slot
];
202 mutex_lock(&vcpu
->mutex
);
203 if (unlikely(!vcpu
->vmcs
)) {
204 mutex_unlock(&vcpu
->mutex
);
207 return kvm_arch_ops
->vcpu_load(vcpu
);
210 static void vcpu_put(struct kvm_vcpu
*vcpu
)
212 kvm_arch_ops
->vcpu_put(vcpu
);
213 mutex_unlock(&vcpu
->mutex
);
216 static int kvm_dev_open(struct inode
*inode
, struct file
*filp
)
218 struct kvm
*kvm
= kzalloc(sizeof(struct kvm
), GFP_KERNEL
);
224 spin_lock_init(&kvm
->lock
);
225 INIT_LIST_HEAD(&kvm
->active_mmu_pages
);
226 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
227 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[i
];
229 mutex_init(&vcpu
->mutex
);
230 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
231 INIT_LIST_HEAD(&vcpu
->free_pages
);
233 filp
->private_data
= kvm
;
238 * Free any memory in @free but not in @dont.
240 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
241 struct kvm_memory_slot
*dont
)
245 if (!dont
|| free
->phys_mem
!= dont
->phys_mem
)
246 if (free
->phys_mem
) {
247 for (i
= 0; i
< free
->npages
; ++i
)
248 if (free
->phys_mem
[i
])
249 __free_page(free
->phys_mem
[i
]);
250 vfree(free
->phys_mem
);
253 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
254 vfree(free
->dirty_bitmap
);
258 free
->dirty_bitmap
= 0;
261 static void kvm_free_physmem(struct kvm
*kvm
)
265 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
266 kvm_free_physmem_slot(&kvm
->memslots
[i
], 0);
269 static void kvm_free_vcpu(struct kvm_vcpu
*vcpu
)
271 kvm_arch_ops
->vcpu_free(vcpu
);
272 kvm_mmu_destroy(vcpu
);
275 static void kvm_free_vcpus(struct kvm
*kvm
)
279 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
)
280 kvm_free_vcpu(&kvm
->vcpus
[i
]);
283 static int kvm_dev_release(struct inode
*inode
, struct file
*filp
)
285 struct kvm
*kvm
= filp
->private_data
;
288 kvm_free_physmem(kvm
);
293 static void inject_gp(struct kvm_vcpu
*vcpu
)
295 kvm_arch_ops
->inject_gp(vcpu
, 0);
298 static int pdptrs_have_reserved_bits_set(struct kvm_vcpu
*vcpu
,
301 gfn_t pdpt_gfn
= cr3
>> PAGE_SHIFT
;
302 unsigned offset
= (cr3
& (PAGE_SIZE
-1)) >> 5;
306 struct kvm_memory_slot
*memslot
;
308 spin_lock(&vcpu
->kvm
->lock
);
309 memslot
= gfn_to_memslot(vcpu
->kvm
, pdpt_gfn
);
310 /* FIXME: !memslot - emulate? 0xff? */
311 pdpt
= kmap_atomic(gfn_to_page(memslot
, pdpt_gfn
), KM_USER0
);
313 for (i
= 0; i
< 4; ++i
) {
314 pdpte
= pdpt
[offset
+ i
];
315 if ((pdpte
& 1) && (pdpte
& 0xfffffff0000001e6ull
))
319 kunmap_atomic(pdpt
, KM_USER0
);
320 spin_unlock(&vcpu
->kvm
->lock
);
325 void set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
)
327 if (cr0
& CR0_RESEVED_BITS
) {
328 printk(KERN_DEBUG
"set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
334 if ((cr0
& CR0_NW_MASK
) && !(cr0
& CR0_CD_MASK
)) {
335 printk(KERN_DEBUG
"set_cr0: #GP, CD == 0 && NW == 1\n");
340 if ((cr0
& CR0_PG_MASK
) && !(cr0
& CR0_PE_MASK
)) {
341 printk(KERN_DEBUG
"set_cr0: #GP, set PG flag "
342 "and a clear PE flag\n");
347 if (!is_paging(vcpu
) && (cr0
& CR0_PG_MASK
)) {
349 if ((vcpu
->shadow_efer
& EFER_LME
)) {
353 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
354 "in long mode while PAE is disabled\n");
358 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
360 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
361 "in long mode while CS.L == 1\n");
369 pdptrs_have_reserved_bits_set(vcpu
, vcpu
->cr3
)) {
370 printk(KERN_DEBUG
"set_cr0: #GP, pdptrs "
378 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
381 spin_lock(&vcpu
->kvm
->lock
);
382 kvm_mmu_reset_context(vcpu
);
383 spin_unlock(&vcpu
->kvm
->lock
);
386 EXPORT_SYMBOL_GPL(set_cr0
);
388 void lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
)
390 set_cr0(vcpu
, (vcpu
->cr0
& ~0x0ful
) | (msw
& 0x0f));
392 EXPORT_SYMBOL_GPL(lmsw
);
394 void set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr4
)
396 if (cr4
& CR4_RESEVED_BITS
) {
397 printk(KERN_DEBUG
"set_cr4: #GP, reserved bits\n");
402 if (is_long_mode(vcpu
)) {
403 if (!(cr4
& CR4_PAE_MASK
)) {
404 printk(KERN_DEBUG
"set_cr4: #GP, clearing PAE while "
409 } else if (is_paging(vcpu
) && !is_pae(vcpu
) && (cr4
& CR4_PAE_MASK
)
410 && pdptrs_have_reserved_bits_set(vcpu
, vcpu
->cr3
)) {
411 printk(KERN_DEBUG
"set_cr4: #GP, pdptrs reserved bits\n");
415 if (cr4
& CR4_VMXE_MASK
) {
416 printk(KERN_DEBUG
"set_cr4: #GP, setting VMXE\n");
420 kvm_arch_ops
->set_cr4(vcpu
, cr4
);
421 spin_lock(&vcpu
->kvm
->lock
);
422 kvm_mmu_reset_context(vcpu
);
423 spin_unlock(&vcpu
->kvm
->lock
);
425 EXPORT_SYMBOL_GPL(set_cr4
);
427 void set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
429 if (is_long_mode(vcpu
)) {
430 if ( cr3
& CR3_L_MODE_RESEVED_BITS
) {
431 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
436 if (cr3
& CR3_RESEVED_BITS
) {
437 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
441 if (is_paging(vcpu
) && is_pae(vcpu
) &&
442 pdptrs_have_reserved_bits_set(vcpu
, cr3
)) {
443 printk(KERN_DEBUG
"set_cr3: #GP, pdptrs "
451 spin_lock(&vcpu
->kvm
->lock
);
452 vcpu
->mmu
.new_cr3(vcpu
);
453 spin_unlock(&vcpu
->kvm
->lock
);
455 EXPORT_SYMBOL_GPL(set_cr3
);
457 void set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
459 if ( cr8
& CR8_RESEVED_BITS
) {
460 printk(KERN_DEBUG
"set_cr8: #GP, reserved bits 0x%lx\n", cr8
);
466 EXPORT_SYMBOL_GPL(set_cr8
);
468 void fx_init(struct kvm_vcpu
*vcpu
)
470 struct __attribute__ ((__packed__
)) fx_image_s
{
476 u64 operand
;// fpu dp
482 fx_save(vcpu
->host_fx_image
);
484 fx_save(vcpu
->guest_fx_image
);
485 fx_restore(vcpu
->host_fx_image
);
487 fx_image
= (struct fx_image_s
*)vcpu
->guest_fx_image
;
488 fx_image
->mxcsr
= 0x1f80;
489 memset(vcpu
->guest_fx_image
+ sizeof(struct fx_image_s
),
490 0, FX_IMAGE_SIZE
- sizeof(struct fx_image_s
));
492 EXPORT_SYMBOL_GPL(fx_init
);
495 * Creates some virtual cpus. Good luck creating more than one.
497 static int kvm_dev_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
500 struct kvm_vcpu
*vcpu
;
506 vcpu
= &kvm
->vcpus
[n
];
508 mutex_lock(&vcpu
->mutex
);
511 mutex_unlock(&vcpu
->mutex
);
515 vcpu
->host_fx_image
= (char*)ALIGN((hva_t
)vcpu
->fx_buf
,
517 vcpu
->guest_fx_image
= vcpu
->host_fx_image
+ FX_IMAGE_SIZE
;
519 vcpu
->cpu
= -1; /* First load will set up TR */
521 r
= kvm_arch_ops
->vcpu_create(vcpu
);
525 r
= kvm_mmu_create(vcpu
);
529 kvm_arch_ops
->vcpu_load(vcpu
);
530 r
= kvm_mmu_setup(vcpu
);
532 r
= kvm_arch_ops
->vcpu_setup(vcpu
);
542 mutex_unlock(&vcpu
->mutex
);
548 * Allocate some memory and give it an address in the guest physical address
551 * Discontiguous memory is allowed, mostly for framebuffers.
553 static int kvm_dev_ioctl_set_memory_region(struct kvm
*kvm
,
554 struct kvm_memory_region
*mem
)
558 unsigned long npages
;
560 struct kvm_memory_slot
*memslot
;
561 struct kvm_memory_slot old
, new;
562 int memory_config_version
;
565 /* General sanity checks */
566 if (mem
->memory_size
& (PAGE_SIZE
- 1))
568 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
570 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
572 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
575 memslot
= &kvm
->memslots
[mem
->slot
];
576 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
577 npages
= mem
->memory_size
>> PAGE_SHIFT
;
580 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
583 spin_lock(&kvm
->lock
);
585 memory_config_version
= kvm
->memory_config_version
;
586 new = old
= *memslot
;
588 new.base_gfn
= base_gfn
;
590 new.flags
= mem
->flags
;
592 /* Disallow changing a memory slot's size. */
594 if (npages
&& old
.npages
&& npages
!= old
.npages
)
597 /* Check for overlaps */
599 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
600 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
604 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
605 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
609 * Do memory allocations outside lock. memory_config_version will
612 spin_unlock(&kvm
->lock
);
614 /* Deallocate if slot is being removed */
618 /* Free page dirty bitmap if unneeded */
619 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
620 new.dirty_bitmap
= 0;
624 /* Allocate if a slot is being created */
625 if (npages
&& !new.phys_mem
) {
626 new.phys_mem
= vmalloc(npages
* sizeof(struct page
*));
631 memset(new.phys_mem
, 0, npages
* sizeof(struct page
*));
632 for (i
= 0; i
< npages
; ++i
) {
633 new.phys_mem
[i
] = alloc_page(GFP_HIGHUSER
635 if (!new.phys_mem
[i
])
640 /* Allocate page dirty bitmap if needed */
641 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
642 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
644 new.dirty_bitmap
= vmalloc(dirty_bytes
);
645 if (!new.dirty_bitmap
)
647 memset(new.dirty_bitmap
, 0, dirty_bytes
);
650 spin_lock(&kvm
->lock
);
652 if (memory_config_version
!= kvm
->memory_config_version
) {
653 spin_unlock(&kvm
->lock
);
654 kvm_free_physmem_slot(&new, &old
);
662 if (mem
->slot
>= kvm
->nmemslots
)
663 kvm
->nmemslots
= mem
->slot
+ 1;
666 ++kvm
->memory_config_version
;
668 spin_unlock(&kvm
->lock
);
670 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
671 struct kvm_vcpu
*vcpu
;
673 vcpu
= vcpu_load(kvm
, i
);
676 kvm_mmu_reset_context(vcpu
);
680 kvm_free_physmem_slot(&old
, &new);
684 spin_unlock(&kvm
->lock
);
686 kvm_free_physmem_slot(&new, &old
);
692 * Get (and clear) the dirty memory log for a memory slot.
694 static int kvm_dev_ioctl_get_dirty_log(struct kvm
*kvm
,
695 struct kvm_dirty_log
*log
)
697 struct kvm_memory_slot
*memslot
;
700 unsigned long any
= 0;
702 spin_lock(&kvm
->lock
);
705 * Prevent changes to guest memory configuration even while the lock
709 spin_unlock(&kvm
->lock
);
711 if (log
->slot
>= KVM_MEMORY_SLOTS
)
714 memslot
= &kvm
->memslots
[log
->slot
];
716 if (!memslot
->dirty_bitmap
)
719 n
= ALIGN(memslot
->npages
, 8) / 8;
721 for (i
= 0; !any
&& i
< n
; ++i
)
722 any
= memslot
->dirty_bitmap
[i
];
725 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
730 spin_lock(&kvm
->lock
);
731 kvm_mmu_slot_remove_write_access(kvm
, log
->slot
);
732 spin_unlock(&kvm
->lock
);
733 memset(memslot
->dirty_bitmap
, 0, n
);
734 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
735 struct kvm_vcpu
*vcpu
= vcpu_load(kvm
, i
);
739 kvm_arch_ops
->tlb_flush(vcpu
);
747 spin_lock(&kvm
->lock
);
749 spin_unlock(&kvm
->lock
);
753 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
757 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
758 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
760 if (gfn
>= memslot
->base_gfn
761 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
766 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
768 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
771 struct kvm_memory_slot
*memslot
= 0;
772 unsigned long rel_gfn
;
774 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
775 memslot
= &kvm
->memslots
[i
];
777 if (gfn
>= memslot
->base_gfn
778 && gfn
< memslot
->base_gfn
+ memslot
->npages
) {
780 if (!memslot
|| !memslot
->dirty_bitmap
)
783 rel_gfn
= gfn
- memslot
->base_gfn
;
786 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
787 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
793 static int emulator_read_std(unsigned long addr
,
796 struct x86_emulate_ctxt
*ctxt
)
798 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
802 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
803 unsigned offset
= addr
& (PAGE_SIZE
-1);
804 unsigned tocopy
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
806 struct kvm_memory_slot
*memslot
;
809 if (gpa
== UNMAPPED_GVA
)
810 return X86EMUL_PROPAGATE_FAULT
;
811 pfn
= gpa
>> PAGE_SHIFT
;
812 memslot
= gfn_to_memslot(vcpu
->kvm
, pfn
);
814 return X86EMUL_UNHANDLEABLE
;
815 page
= kmap_atomic(gfn_to_page(memslot
, pfn
), KM_USER0
);
817 memcpy(data
, page
+ offset
, tocopy
);
819 kunmap_atomic(page
, KM_USER0
);
826 return X86EMUL_CONTINUE
;
829 static int emulator_write_std(unsigned long addr
,
832 struct x86_emulate_ctxt
*ctxt
)
834 printk(KERN_ERR
"emulator_write_std: addr %lx n %d\n",
836 return X86EMUL_UNHANDLEABLE
;
839 static int emulator_read_emulated(unsigned long addr
,
842 struct x86_emulate_ctxt
*ctxt
)
844 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
846 if (vcpu
->mmio_read_completed
) {
847 memcpy(val
, vcpu
->mmio_data
, bytes
);
848 vcpu
->mmio_read_completed
= 0;
849 return X86EMUL_CONTINUE
;
850 } else if (emulator_read_std(addr
, val
, bytes
, ctxt
)
852 return X86EMUL_CONTINUE
;
854 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
855 if (gpa
== UNMAPPED_GVA
)
856 return vcpu_printf(vcpu
, "not present\n"), X86EMUL_PROPAGATE_FAULT
;
857 vcpu
->mmio_needed
= 1;
858 vcpu
->mmio_phys_addr
= gpa
;
859 vcpu
->mmio_size
= bytes
;
860 vcpu
->mmio_is_write
= 0;
862 return X86EMUL_UNHANDLEABLE
;
866 static int emulator_write_emulated(unsigned long addr
,
869 struct x86_emulate_ctxt
*ctxt
)
871 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
872 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
874 if (gpa
== UNMAPPED_GVA
)
875 return X86EMUL_PROPAGATE_FAULT
;
877 vcpu
->mmio_needed
= 1;
878 vcpu
->mmio_phys_addr
= gpa
;
879 vcpu
->mmio_size
= bytes
;
880 vcpu
->mmio_is_write
= 1;
881 memcpy(vcpu
->mmio_data
, &val
, bytes
);
883 return X86EMUL_CONTINUE
;
886 static int emulator_cmpxchg_emulated(unsigned long addr
,
890 struct x86_emulate_ctxt
*ctxt
)
896 printk(KERN_WARNING
"kvm: emulating exchange as write\n");
898 return emulator_write_emulated(addr
, new, bytes
, ctxt
);
901 static unsigned long get_segment_base(struct kvm_vcpu
*vcpu
, int seg
)
903 return kvm_arch_ops
->get_segment_base(vcpu
, seg
);
906 int emulate_invlpg(struct kvm_vcpu
*vcpu
, gva_t address
)
908 spin_lock(&vcpu
->kvm
->lock
);
909 vcpu
->mmu
.inval_page(vcpu
, address
);
910 spin_unlock(&vcpu
->kvm
->lock
);
911 kvm_arch_ops
->invlpg(vcpu
, address
);
912 return X86EMUL_CONTINUE
;
915 int emulate_clts(struct kvm_vcpu
*vcpu
)
917 unsigned long cr0
= vcpu
->cr0
;
920 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
921 return X86EMUL_CONTINUE
;
924 int emulator_get_dr(struct x86_emulate_ctxt
* ctxt
, int dr
, unsigned long *dest
)
926 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
930 *dest
= kvm_arch_ops
->get_dr(vcpu
, dr
);
931 return X86EMUL_CONTINUE
;
933 printk(KERN_DEBUG
"%s: unexpected dr %u\n",
935 return X86EMUL_UNHANDLEABLE
;
939 int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
, unsigned long value
)
941 unsigned long mask
= (ctxt
->mode
== X86EMUL_MODE_PROT64
) ? ~0ULL : ~0U;
944 kvm_arch_ops
->set_dr(ctxt
->vcpu
, dr
, value
& mask
, &exception
);
946 /* FIXME: better handling */
947 return X86EMUL_UNHANDLEABLE
;
949 return X86EMUL_CONTINUE
;
952 static void report_emulation_failure(struct x86_emulate_ctxt
*ctxt
)
956 unsigned long rip
= ctxt
->vcpu
->rip
;
957 unsigned long rip_linear
;
959 rip_linear
= rip
+ get_segment_base(ctxt
->vcpu
, VCPU_SREG_CS
);
964 emulator_read_std(rip_linear
, (void *)opcodes
, 4, ctxt
);
966 printk(KERN_ERR
"emulation failed but !mmio_needed?"
967 " rip %lx %02x %02x %02x %02x\n",
968 rip
, opcodes
[0], opcodes
[1], opcodes
[2], opcodes
[3]);
972 struct x86_emulate_ops emulate_ops
= {
973 .read_std
= emulator_read_std
,
974 .write_std
= emulator_write_std
,
975 .read_emulated
= emulator_read_emulated
,
976 .write_emulated
= emulator_write_emulated
,
977 .cmpxchg_emulated
= emulator_cmpxchg_emulated
,
980 int emulate_instruction(struct kvm_vcpu
*vcpu
,
985 struct x86_emulate_ctxt emulate_ctxt
;
989 kvm_arch_ops
->cache_regs(vcpu
);
991 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
993 emulate_ctxt
.vcpu
= vcpu
;
994 emulate_ctxt
.eflags
= kvm_arch_ops
->get_rflags(vcpu
);
995 emulate_ctxt
.cr2
= cr2
;
996 emulate_ctxt
.mode
= (emulate_ctxt
.eflags
& X86_EFLAGS_VM
)
997 ? X86EMUL_MODE_REAL
: cs_l
998 ? X86EMUL_MODE_PROT64
: cs_db
999 ? X86EMUL_MODE_PROT32
: X86EMUL_MODE_PROT16
;
1001 if (emulate_ctxt
.mode
== X86EMUL_MODE_PROT64
) {
1002 emulate_ctxt
.cs_base
= 0;
1003 emulate_ctxt
.ds_base
= 0;
1004 emulate_ctxt
.es_base
= 0;
1005 emulate_ctxt
.ss_base
= 0;
1007 emulate_ctxt
.cs_base
= get_segment_base(vcpu
, VCPU_SREG_CS
);
1008 emulate_ctxt
.ds_base
= get_segment_base(vcpu
, VCPU_SREG_DS
);
1009 emulate_ctxt
.es_base
= get_segment_base(vcpu
, VCPU_SREG_ES
);
1010 emulate_ctxt
.ss_base
= get_segment_base(vcpu
, VCPU_SREG_SS
);
1013 emulate_ctxt
.gs_base
= get_segment_base(vcpu
, VCPU_SREG_GS
);
1014 emulate_ctxt
.fs_base
= get_segment_base(vcpu
, VCPU_SREG_FS
);
1016 vcpu
->mmio_is_write
= 0;
1017 r
= x86_emulate_memop(&emulate_ctxt
, &emulate_ops
);
1019 if ((r
|| vcpu
->mmio_is_write
) && run
) {
1020 run
->mmio
.phys_addr
= vcpu
->mmio_phys_addr
;
1021 memcpy(run
->mmio
.data
, vcpu
->mmio_data
, 8);
1022 run
->mmio
.len
= vcpu
->mmio_size
;
1023 run
->mmio
.is_write
= vcpu
->mmio_is_write
;
1027 if (!vcpu
->mmio_needed
) {
1028 report_emulation_failure(&emulate_ctxt
);
1029 return EMULATE_FAIL
;
1031 return EMULATE_DO_MMIO
;
1034 kvm_arch_ops
->decache_regs(vcpu
);
1035 kvm_arch_ops
->set_rflags(vcpu
, emulate_ctxt
.eflags
);
1037 if (vcpu
->mmio_is_write
)
1038 return EMULATE_DO_MMIO
;
1040 return EMULATE_DONE
;
1042 EXPORT_SYMBOL_GPL(emulate_instruction
);
1044 static u64
mk_cr_64(u64 curr_cr
, u32 new_val
)
1046 return (curr_cr
& ~((1ULL << 32) - 1)) | new_val
;
1049 void realmode_lgdt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1051 struct descriptor_table dt
= { limit
, base
};
1053 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1056 void realmode_lidt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1058 struct descriptor_table dt
= { limit
, base
};
1060 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1063 void realmode_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
,
1064 unsigned long *rflags
)
1067 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1070 unsigned long realmode_get_cr(struct kvm_vcpu
*vcpu
, int cr
)
1082 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1087 void realmode_set_cr(struct kvm_vcpu
*vcpu
, int cr
, unsigned long val
,
1088 unsigned long *rflags
)
1092 set_cr0(vcpu
, mk_cr_64(vcpu
->cr0
, val
));
1093 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1102 set_cr4(vcpu
, mk_cr_64(vcpu
->cr4
, val
));
1105 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1109 int kvm_get_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*pdata
)
1114 case 0xc0010010: /* SYSCFG */
1115 case 0xc0010015: /* HWCR */
1116 case MSR_IA32_PLATFORM_ID
:
1117 case MSR_IA32_P5_MC_ADDR
:
1118 case MSR_IA32_P5_MC_TYPE
:
1119 case MSR_IA32_MC0_CTL
:
1120 case MSR_IA32_MCG_STATUS
:
1121 case MSR_IA32_MCG_CAP
:
1122 case MSR_IA32_MC0_MISC
:
1123 case MSR_IA32_MC0_MISC
+4:
1124 case MSR_IA32_MC0_MISC
+8:
1125 case MSR_IA32_MC0_MISC
+12:
1126 case MSR_IA32_MC0_MISC
+16:
1127 case MSR_IA32_UCODE_REV
:
1128 case MSR_IA32_PERF_STATUS
:
1129 /* MTRR registers */
1131 case 0x200 ... 0x2ff:
1134 case 0xcd: /* fsb frequency */
1137 case MSR_IA32_APICBASE
:
1138 data
= vcpu
->apic_base
;
1140 #ifdef CONFIG_X86_64
1142 data
= vcpu
->shadow_efer
;
1146 printk(KERN_ERR
"kvm: unhandled rdmsr: 0x%x\n", msr
);
1152 EXPORT_SYMBOL_GPL(kvm_get_msr_common
);
1155 * Reads an msr value (of 'msr_index') into 'pdata'.
1156 * Returns 0 on success, non-0 otherwise.
1157 * Assumes vcpu_load() was already called.
1159 static int get_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64
*pdata
)
1161 return kvm_arch_ops
->get_msr(vcpu
, msr_index
, pdata
);
1164 #ifdef CONFIG_X86_64
1166 static void set_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1168 if (efer
& EFER_RESERVED_BITS
) {
1169 printk(KERN_DEBUG
"set_efer: 0x%llx #GP, reserved bits\n",
1176 && (vcpu
->shadow_efer
& EFER_LME
) != (efer
& EFER_LME
)) {
1177 printk(KERN_DEBUG
"set_efer: #GP, change LME while paging\n");
1182 kvm_arch_ops
->set_efer(vcpu
, efer
);
1185 efer
|= vcpu
->shadow_efer
& EFER_LMA
;
1187 vcpu
->shadow_efer
= efer
;
1192 int kvm_set_msr_common(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
1195 #ifdef CONFIG_X86_64
1197 set_efer(vcpu
, data
);
1200 case MSR_IA32_MC0_STATUS
:
1201 printk(KERN_WARNING
"%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1202 __FUNCTION__
, data
);
1204 case MSR_IA32_UCODE_REV
:
1205 case MSR_IA32_UCODE_WRITE
:
1206 case 0x200 ... 0x2ff: /* MTRRs */
1208 case MSR_IA32_APICBASE
:
1209 vcpu
->apic_base
= data
;
1212 printk(KERN_ERR
"kvm: unhandled wrmsr: 0x%x\n", msr
);
1217 EXPORT_SYMBOL_GPL(kvm_set_msr_common
);
1220 * Writes msr value into into the appropriate "register".
1221 * Returns 0 on success, non-0 otherwise.
1222 * Assumes vcpu_load() was already called.
1224 static int set_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64 data
)
1226 return kvm_arch_ops
->set_msr(vcpu
, msr_index
, data
);
1229 void kvm_resched(struct kvm_vcpu
*vcpu
)
1233 /* Cannot fail - no vcpu unplug yet. */
1234 vcpu_load(vcpu
->kvm
, vcpu_slot(vcpu
));
1236 EXPORT_SYMBOL_GPL(kvm_resched
);
1238 void load_msrs(struct vmx_msr_entry
*e
, int n
)
1242 for (i
= 0; i
< n
; ++i
)
1243 wrmsrl(e
[i
].index
, e
[i
].data
);
1245 EXPORT_SYMBOL_GPL(load_msrs
);
1247 void save_msrs(struct vmx_msr_entry
*e
, int n
)
1251 for (i
= 0; i
< n
; ++i
)
1252 rdmsrl(e
[i
].index
, e
[i
].data
);
1254 EXPORT_SYMBOL_GPL(save_msrs
);
1256 static int kvm_dev_ioctl_run(struct kvm
*kvm
, struct kvm_run
*kvm_run
)
1258 struct kvm_vcpu
*vcpu
;
1261 if (!valid_vcpu(kvm_run
->vcpu
))
1264 vcpu
= vcpu_load(kvm
, kvm_run
->vcpu
);
1268 if (kvm_run
->emulated
) {
1269 kvm_arch_ops
->skip_emulated_instruction(vcpu
);
1270 kvm_run
->emulated
= 0;
1273 if (kvm_run
->mmio_completed
) {
1274 memcpy(vcpu
->mmio_data
, kvm_run
->mmio
.data
, 8);
1275 vcpu
->mmio_read_completed
= 1;
1278 vcpu
->mmio_needed
= 0;
1280 r
= kvm_arch_ops
->run(vcpu
, kvm_run
);
1286 static int kvm_dev_ioctl_get_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1288 struct kvm_vcpu
*vcpu
;
1290 if (!valid_vcpu(regs
->vcpu
))
1293 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1297 kvm_arch_ops
->cache_regs(vcpu
);
1299 regs
->rax
= vcpu
->regs
[VCPU_REGS_RAX
];
1300 regs
->rbx
= vcpu
->regs
[VCPU_REGS_RBX
];
1301 regs
->rcx
= vcpu
->regs
[VCPU_REGS_RCX
];
1302 regs
->rdx
= vcpu
->regs
[VCPU_REGS_RDX
];
1303 regs
->rsi
= vcpu
->regs
[VCPU_REGS_RSI
];
1304 regs
->rdi
= vcpu
->regs
[VCPU_REGS_RDI
];
1305 regs
->rsp
= vcpu
->regs
[VCPU_REGS_RSP
];
1306 regs
->rbp
= vcpu
->regs
[VCPU_REGS_RBP
];
1307 #ifdef CONFIG_X86_64
1308 regs
->r8
= vcpu
->regs
[VCPU_REGS_R8
];
1309 regs
->r9
= vcpu
->regs
[VCPU_REGS_R9
];
1310 regs
->r10
= vcpu
->regs
[VCPU_REGS_R10
];
1311 regs
->r11
= vcpu
->regs
[VCPU_REGS_R11
];
1312 regs
->r12
= vcpu
->regs
[VCPU_REGS_R12
];
1313 regs
->r13
= vcpu
->regs
[VCPU_REGS_R13
];
1314 regs
->r14
= vcpu
->regs
[VCPU_REGS_R14
];
1315 regs
->r15
= vcpu
->regs
[VCPU_REGS_R15
];
1318 regs
->rip
= vcpu
->rip
;
1319 regs
->rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1322 * Don't leak debug flags in case they were set for guest debugging
1324 if (vcpu
->guest_debug
.enabled
&& vcpu
->guest_debug
.singlestep
)
1325 regs
->rflags
&= ~(X86_EFLAGS_TF
| X86_EFLAGS_RF
);
1332 static int kvm_dev_ioctl_set_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1334 struct kvm_vcpu
*vcpu
;
1336 if (!valid_vcpu(regs
->vcpu
))
1339 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1343 vcpu
->regs
[VCPU_REGS_RAX
] = regs
->rax
;
1344 vcpu
->regs
[VCPU_REGS_RBX
] = regs
->rbx
;
1345 vcpu
->regs
[VCPU_REGS_RCX
] = regs
->rcx
;
1346 vcpu
->regs
[VCPU_REGS_RDX
] = regs
->rdx
;
1347 vcpu
->regs
[VCPU_REGS_RSI
] = regs
->rsi
;
1348 vcpu
->regs
[VCPU_REGS_RDI
] = regs
->rdi
;
1349 vcpu
->regs
[VCPU_REGS_RSP
] = regs
->rsp
;
1350 vcpu
->regs
[VCPU_REGS_RBP
] = regs
->rbp
;
1351 #ifdef CONFIG_X86_64
1352 vcpu
->regs
[VCPU_REGS_R8
] = regs
->r8
;
1353 vcpu
->regs
[VCPU_REGS_R9
] = regs
->r9
;
1354 vcpu
->regs
[VCPU_REGS_R10
] = regs
->r10
;
1355 vcpu
->regs
[VCPU_REGS_R11
] = regs
->r11
;
1356 vcpu
->regs
[VCPU_REGS_R12
] = regs
->r12
;
1357 vcpu
->regs
[VCPU_REGS_R13
] = regs
->r13
;
1358 vcpu
->regs
[VCPU_REGS_R14
] = regs
->r14
;
1359 vcpu
->regs
[VCPU_REGS_R15
] = regs
->r15
;
1362 vcpu
->rip
= regs
->rip
;
1363 kvm_arch_ops
->set_rflags(vcpu
, regs
->rflags
);
1365 kvm_arch_ops
->decache_regs(vcpu
);
1372 static void get_segment(struct kvm_vcpu
*vcpu
,
1373 struct kvm_segment
*var
, int seg
)
1375 return kvm_arch_ops
->get_segment(vcpu
, var
, seg
);
1378 static int kvm_dev_ioctl_get_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1380 struct kvm_vcpu
*vcpu
;
1381 struct descriptor_table dt
;
1383 if (!valid_vcpu(sregs
->vcpu
))
1385 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1389 get_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1390 get_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1391 get_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1392 get_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1393 get_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1394 get_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1396 get_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1397 get_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1399 kvm_arch_ops
->get_idt(vcpu
, &dt
);
1400 sregs
->idt
.limit
= dt
.limit
;
1401 sregs
->idt
.base
= dt
.base
;
1402 kvm_arch_ops
->get_gdt(vcpu
, &dt
);
1403 sregs
->gdt
.limit
= dt
.limit
;
1404 sregs
->gdt
.base
= dt
.base
;
1406 sregs
->cr0
= vcpu
->cr0
;
1407 sregs
->cr2
= vcpu
->cr2
;
1408 sregs
->cr3
= vcpu
->cr3
;
1409 sregs
->cr4
= vcpu
->cr4
;
1410 sregs
->cr8
= vcpu
->cr8
;
1411 sregs
->efer
= vcpu
->shadow_efer
;
1412 sregs
->apic_base
= vcpu
->apic_base
;
1414 memcpy(sregs
->interrupt_bitmap
, vcpu
->irq_pending
,
1415 sizeof sregs
->interrupt_bitmap
);
1422 static void set_segment(struct kvm_vcpu
*vcpu
,
1423 struct kvm_segment
*var
, int seg
)
1425 return kvm_arch_ops
->set_segment(vcpu
, var
, seg
);
1428 static int kvm_dev_ioctl_set_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1430 struct kvm_vcpu
*vcpu
;
1431 int mmu_reset_needed
= 0;
1433 struct descriptor_table dt
;
1435 if (!valid_vcpu(sregs
->vcpu
))
1437 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1441 set_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1442 set_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1443 set_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1444 set_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1445 set_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1446 set_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1448 set_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1449 set_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1451 dt
.limit
= sregs
->idt
.limit
;
1452 dt
.base
= sregs
->idt
.base
;
1453 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1454 dt
.limit
= sregs
->gdt
.limit
;
1455 dt
.base
= sregs
->gdt
.base
;
1456 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1458 vcpu
->cr2
= sregs
->cr2
;
1459 mmu_reset_needed
|= vcpu
->cr3
!= sregs
->cr3
;
1460 vcpu
->cr3
= sregs
->cr3
;
1462 vcpu
->cr8
= sregs
->cr8
;
1464 mmu_reset_needed
|= vcpu
->shadow_efer
!= sregs
->efer
;
1465 #ifdef CONFIG_X86_64
1466 kvm_arch_ops
->set_efer(vcpu
, sregs
->efer
);
1468 vcpu
->apic_base
= sregs
->apic_base
;
1470 mmu_reset_needed
|= vcpu
->cr0
!= sregs
->cr0
;
1471 kvm_arch_ops
->set_cr0_no_modeswitch(vcpu
, sregs
->cr0
);
1473 mmu_reset_needed
|= vcpu
->cr4
!= sregs
->cr4
;
1474 kvm_arch_ops
->set_cr4(vcpu
, sregs
->cr4
);
1476 if (mmu_reset_needed
)
1477 kvm_mmu_reset_context(vcpu
);
1479 memcpy(vcpu
->irq_pending
, sregs
->interrupt_bitmap
,
1480 sizeof vcpu
->irq_pending
);
1481 vcpu
->irq_summary
= 0;
1482 for (i
= 0; i
< NR_IRQ_WORDS
; ++i
)
1483 if (vcpu
->irq_pending
[i
])
1484 __set_bit(i
, &vcpu
->irq_summary
);
1492 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1493 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1495 * This list is modified at module load time to reflect the
1496 * capabilities of the host cpu.
1498 static u32 msrs_to_save
[] = {
1499 MSR_IA32_SYSENTER_CS
, MSR_IA32_SYSENTER_ESP
, MSR_IA32_SYSENTER_EIP
,
1501 #ifdef CONFIG_X86_64
1502 MSR_CSTAR
, MSR_KERNEL_GS_BASE
, MSR_SYSCALL_MASK
, MSR_LSTAR
,
1504 MSR_IA32_TIME_STAMP_COUNTER
,
1507 static unsigned num_msrs_to_save
;
1509 static __init
void kvm_init_msr_list(void)
1514 for (i
= j
= 0; i
< ARRAY_SIZE(msrs_to_save
); i
++) {
1515 if (rdmsr_safe(msrs_to_save
[i
], &dummy
[0], &dummy
[1]) < 0)
1518 msrs_to_save
[j
] = msrs_to_save
[i
];
1521 num_msrs_to_save
= j
;
1525 * Adapt set_msr() to msr_io()'s calling convention
1527 static int do_set_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1529 return set_msr(vcpu
, index
, *data
);
1533 * Read or write a bunch of msrs. All parameters are kernel addresses.
1535 * @return number of msrs set successfully.
1537 static int __msr_io(struct kvm
*kvm
, struct kvm_msrs
*msrs
,
1538 struct kvm_msr_entry
*entries
,
1539 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1540 unsigned index
, u64
*data
))
1542 struct kvm_vcpu
*vcpu
;
1545 if (!valid_vcpu(msrs
->vcpu
))
1548 vcpu
= vcpu_load(kvm
, msrs
->vcpu
);
1552 for (i
= 0; i
< msrs
->nmsrs
; ++i
)
1553 if (do_msr(vcpu
, entries
[i
].index
, &entries
[i
].data
))
1562 * Read or write a bunch of msrs. Parameters are user addresses.
1564 * @return number of msrs set successfully.
1566 static int msr_io(struct kvm
*kvm
, struct kvm_msrs __user
*user_msrs
,
1567 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1568 unsigned index
, u64
*data
),
1571 struct kvm_msrs msrs
;
1572 struct kvm_msr_entry
*entries
;
1577 if (copy_from_user(&msrs
, user_msrs
, sizeof msrs
))
1581 if (msrs
.nmsrs
>= MAX_IO_MSRS
)
1585 size
= sizeof(struct kvm_msr_entry
) * msrs
.nmsrs
;
1586 entries
= vmalloc(size
);
1591 if (copy_from_user(entries
, user_msrs
->entries
, size
))
1594 r
= n
= __msr_io(kvm
, &msrs
, entries
, do_msr
);
1599 if (writeback
&& copy_to_user(user_msrs
->entries
, entries
, size
))
1611 * Translate a guest virtual address to a guest physical address.
1613 static int kvm_dev_ioctl_translate(struct kvm
*kvm
, struct kvm_translation
*tr
)
1615 unsigned long vaddr
= tr
->linear_address
;
1616 struct kvm_vcpu
*vcpu
;
1619 vcpu
= vcpu_load(kvm
, tr
->vcpu
);
1622 spin_lock(&kvm
->lock
);
1623 gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, vaddr
);
1624 tr
->physical_address
= gpa
;
1625 tr
->valid
= gpa
!= UNMAPPED_GVA
;
1628 spin_unlock(&kvm
->lock
);
1634 static int kvm_dev_ioctl_interrupt(struct kvm
*kvm
, struct kvm_interrupt
*irq
)
1636 struct kvm_vcpu
*vcpu
;
1638 if (!valid_vcpu(irq
->vcpu
))
1640 if (irq
->irq
< 0 || irq
->irq
>= 256)
1642 vcpu
= vcpu_load(kvm
, irq
->vcpu
);
1646 set_bit(irq
->irq
, vcpu
->irq_pending
);
1647 set_bit(irq
->irq
/ BITS_PER_LONG
, &vcpu
->irq_summary
);
1654 static int kvm_dev_ioctl_debug_guest(struct kvm
*kvm
,
1655 struct kvm_debug_guest
*dbg
)
1657 struct kvm_vcpu
*vcpu
;
1660 if (!valid_vcpu(dbg
->vcpu
))
1662 vcpu
= vcpu_load(kvm
, dbg
->vcpu
);
1666 r
= kvm_arch_ops
->set_guest_debug(vcpu
, dbg
);
1673 static long kvm_dev_ioctl(struct file
*filp
,
1674 unsigned int ioctl
, unsigned long arg
)
1676 struct kvm
*kvm
= filp
->private_data
;
1680 case KVM_GET_API_VERSION
:
1681 r
= KVM_API_VERSION
;
1683 case KVM_CREATE_VCPU
: {
1684 r
= kvm_dev_ioctl_create_vcpu(kvm
, arg
);
1690 struct kvm_run kvm_run
;
1693 if (copy_from_user(&kvm_run
, (void *)arg
, sizeof kvm_run
))
1695 r
= kvm_dev_ioctl_run(kvm
, &kvm_run
);
1699 if (copy_to_user((void *)arg
, &kvm_run
, sizeof kvm_run
))
1704 case KVM_GET_REGS
: {
1705 struct kvm_regs kvm_regs
;
1708 if (copy_from_user(&kvm_regs
, (void *)arg
, sizeof kvm_regs
))
1710 r
= kvm_dev_ioctl_get_regs(kvm
, &kvm_regs
);
1714 if (copy_to_user((void *)arg
, &kvm_regs
, sizeof kvm_regs
))
1719 case KVM_SET_REGS
: {
1720 struct kvm_regs kvm_regs
;
1723 if (copy_from_user(&kvm_regs
, (void *)arg
, sizeof kvm_regs
))
1725 r
= kvm_dev_ioctl_set_regs(kvm
, &kvm_regs
);
1731 case KVM_GET_SREGS
: {
1732 struct kvm_sregs kvm_sregs
;
1735 if (copy_from_user(&kvm_sregs
, (void *)arg
, sizeof kvm_sregs
))
1737 r
= kvm_dev_ioctl_get_sregs(kvm
, &kvm_sregs
);
1741 if (copy_to_user((void *)arg
, &kvm_sregs
, sizeof kvm_sregs
))
1746 case KVM_SET_SREGS
: {
1747 struct kvm_sregs kvm_sregs
;
1750 if (copy_from_user(&kvm_sregs
, (void *)arg
, sizeof kvm_sregs
))
1752 r
= kvm_dev_ioctl_set_sregs(kvm
, &kvm_sregs
);
1758 case KVM_TRANSLATE
: {
1759 struct kvm_translation tr
;
1762 if (copy_from_user(&tr
, (void *)arg
, sizeof tr
))
1764 r
= kvm_dev_ioctl_translate(kvm
, &tr
);
1768 if (copy_to_user((void *)arg
, &tr
, sizeof tr
))
1773 case KVM_INTERRUPT
: {
1774 struct kvm_interrupt irq
;
1777 if (copy_from_user(&irq
, (void *)arg
, sizeof irq
))
1779 r
= kvm_dev_ioctl_interrupt(kvm
, &irq
);
1785 case KVM_DEBUG_GUEST
: {
1786 struct kvm_debug_guest dbg
;
1789 if (copy_from_user(&dbg
, (void *)arg
, sizeof dbg
))
1791 r
= kvm_dev_ioctl_debug_guest(kvm
, &dbg
);
1797 case KVM_SET_MEMORY_REGION
: {
1798 struct kvm_memory_region kvm_mem
;
1801 if (copy_from_user(&kvm_mem
, (void *)arg
, sizeof kvm_mem
))
1803 r
= kvm_dev_ioctl_set_memory_region(kvm
, &kvm_mem
);
1808 case KVM_GET_DIRTY_LOG
: {
1809 struct kvm_dirty_log log
;
1812 if (copy_from_user(&log
, (void *)arg
, sizeof log
))
1814 r
= kvm_dev_ioctl_get_dirty_log(kvm
, &log
);
1820 r
= msr_io(kvm
, (void __user
*)arg
, get_msr
, 1);
1823 r
= msr_io(kvm
, (void __user
*)arg
, do_set_msr
, 0);
1825 case KVM_GET_MSR_INDEX_LIST
: {
1826 struct kvm_msr_list __user
*user_msr_list
= (void __user
*)arg
;
1827 struct kvm_msr_list msr_list
;
1831 if (copy_from_user(&msr_list
, user_msr_list
, sizeof msr_list
))
1834 msr_list
.nmsrs
= num_msrs_to_save
;
1835 if (copy_to_user(user_msr_list
, &msr_list
, sizeof msr_list
))
1838 if (n
< num_msrs_to_save
)
1841 if (copy_to_user(user_msr_list
->indices
, &msrs_to_save
,
1842 num_msrs_to_save
* sizeof(u32
)))
1853 static struct page
*kvm_dev_nopage(struct vm_area_struct
*vma
,
1854 unsigned long address
,
1857 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1858 unsigned long pgoff
;
1859 struct kvm_memory_slot
*slot
;
1862 *type
= VM_FAULT_MINOR
;
1863 pgoff
= ((address
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1864 slot
= gfn_to_memslot(kvm
, pgoff
);
1866 return NOPAGE_SIGBUS
;
1867 page
= gfn_to_page(slot
, pgoff
);
1869 return NOPAGE_SIGBUS
;
1874 static struct vm_operations_struct kvm_dev_vm_ops
= {
1875 .nopage
= kvm_dev_nopage
,
1878 static int kvm_dev_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1880 vma
->vm_ops
= &kvm_dev_vm_ops
;
1884 static struct file_operations kvm_chardev_ops
= {
1885 .open
= kvm_dev_open
,
1886 .release
= kvm_dev_release
,
1887 .unlocked_ioctl
= kvm_dev_ioctl
,
1888 .compat_ioctl
= kvm_dev_ioctl
,
1889 .mmap
= kvm_dev_mmap
,
1892 static struct miscdevice kvm_dev
= {
1898 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1901 if (val
== SYS_RESTART
) {
1903 * Some (well, at least mine) BIOSes hang on reboot if
1906 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1907 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1912 static struct notifier_block kvm_reboot_notifier
= {
1913 .notifier_call
= kvm_reboot
,
1917 static __init
void kvm_init_debug(void)
1919 struct kvm_stats_debugfs_item
*p
;
1921 debugfs_dir
= debugfs_create_dir("kvm", 0);
1922 for (p
= debugfs_entries
; p
->name
; ++p
)
1923 p
->dentry
= debugfs_create_u32(p
->name
, 0444, debugfs_dir
,
1927 static void kvm_exit_debug(void)
1929 struct kvm_stats_debugfs_item
*p
;
1931 for (p
= debugfs_entries
; p
->name
; ++p
)
1932 debugfs_remove(p
->dentry
);
1933 debugfs_remove(debugfs_dir
);
1936 hpa_t bad_page_address
;
1938 int kvm_init_arch(struct kvm_arch_ops
*ops
, struct module
*module
)
1943 printk(KERN_ERR
"kvm: already loaded the other module\n");
1949 if (!kvm_arch_ops
->cpu_has_kvm_support()) {
1950 printk(KERN_ERR
"kvm: no hardware support\n");
1953 if (kvm_arch_ops
->disabled_by_bios()) {
1954 printk(KERN_ERR
"kvm: disabled by bios\n");
1958 r
= kvm_arch_ops
->hardware_setup();
1962 on_each_cpu(kvm_arch_ops
->hardware_enable
, 0, 0, 1);
1963 register_reboot_notifier(&kvm_reboot_notifier
);
1965 kvm_chardev_ops
.owner
= module
;
1967 r
= misc_register(&kvm_dev
);
1969 printk (KERN_ERR
"kvm: misc device register failed\n");
1976 unregister_reboot_notifier(&kvm_reboot_notifier
);
1977 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1978 kvm_arch_ops
->hardware_unsetup();
1982 void kvm_exit_arch(void)
1984 misc_deregister(&kvm_dev
);
1986 unregister_reboot_notifier(&kvm_reboot_notifier
);
1987 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1988 kvm_arch_ops
->hardware_unsetup();
1989 kvm_arch_ops
= NULL
;
1992 static __init
int kvm_init(void)
1994 static struct page
*bad_page
;
1999 kvm_init_msr_list();
2001 if ((bad_page
= alloc_page(GFP_KERNEL
)) == NULL
) {
2006 bad_page_address
= page_to_pfn(bad_page
) << PAGE_SHIFT
;
2007 memset(__va(bad_page_address
), 0, PAGE_SIZE
);
2016 static __exit
void kvm_exit(void)
2019 __free_page(pfn_to_page(bad_page_address
>> PAGE_SHIFT
));
2022 module_init(kvm_init
)
2023 module_exit(kvm_exit
)
2025 EXPORT_SYMBOL_GPL(kvm_init_arch
);
2026 EXPORT_SYMBOL_GPL(kvm_exit_arch
);