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 int kvm_read_guest(struct kvm_vcpu
*vcpu
,
121 unsigned char *host_buf
= dest
;
122 unsigned long req_size
= size
;
130 paddr
= gva_to_hpa(vcpu
, addr
);
132 if (is_error_hpa(paddr
))
135 guest_buf
= (hva_t
)kmap_atomic(
136 pfn_to_page(paddr
>> PAGE_SHIFT
),
138 offset
= addr
& ~PAGE_MASK
;
140 now
= min(size
, PAGE_SIZE
- offset
);
141 memcpy(host_buf
, (void*)guest_buf
, now
);
145 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
147 return req_size
- size
;
149 EXPORT_SYMBOL_GPL(kvm_read_guest
);
151 int kvm_write_guest(struct kvm_vcpu
*vcpu
,
156 unsigned char *host_buf
= data
;
157 unsigned long req_size
= size
;
165 paddr
= gva_to_hpa(vcpu
, addr
);
167 if (is_error_hpa(paddr
))
170 guest_buf
= (hva_t
)kmap_atomic(
171 pfn_to_page(paddr
>> PAGE_SHIFT
), KM_USER0
);
172 offset
= addr
& ~PAGE_MASK
;
174 now
= min(size
, PAGE_SIZE
- offset
);
175 memcpy((void*)guest_buf
, host_buf
, now
);
179 kunmap_atomic((void *)(guest_buf
& PAGE_MASK
), KM_USER0
);
181 return req_size
- size
;
183 EXPORT_SYMBOL_GPL(kvm_write_guest
);
185 static int vcpu_slot(struct kvm_vcpu
*vcpu
)
187 return vcpu
- vcpu
->kvm
->vcpus
;
191 * Switches to specified vcpu, until a matching vcpu_put()
193 static struct kvm_vcpu
*vcpu_load(struct kvm
*kvm
, int vcpu_slot
)
195 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[vcpu_slot
];
197 mutex_lock(&vcpu
->mutex
);
198 if (unlikely(!vcpu
->vmcs
)) {
199 mutex_unlock(&vcpu
->mutex
);
202 return kvm_arch_ops
->vcpu_load(vcpu
);
205 static void vcpu_put(struct kvm_vcpu
*vcpu
)
207 kvm_arch_ops
->vcpu_put(vcpu
);
208 mutex_unlock(&vcpu
->mutex
);
211 static int kvm_dev_open(struct inode
*inode
, struct file
*filp
)
213 struct kvm
*kvm
= kzalloc(sizeof(struct kvm
), GFP_KERNEL
);
219 spin_lock_init(&kvm
->lock
);
220 INIT_LIST_HEAD(&kvm
->active_mmu_pages
);
221 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
222 struct kvm_vcpu
*vcpu
= &kvm
->vcpus
[i
];
224 mutex_init(&vcpu
->mutex
);
225 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
226 INIT_LIST_HEAD(&vcpu
->free_pages
);
228 filp
->private_data
= kvm
;
233 * Free any memory in @free but not in @dont.
235 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
236 struct kvm_memory_slot
*dont
)
240 if (!dont
|| free
->phys_mem
!= dont
->phys_mem
)
241 if (free
->phys_mem
) {
242 for (i
= 0; i
< free
->npages
; ++i
)
243 __free_page(free
->phys_mem
[i
]);
244 vfree(free
->phys_mem
);
247 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
248 vfree(free
->dirty_bitmap
);
252 free
->dirty_bitmap
= 0;
255 static void kvm_free_physmem(struct kvm
*kvm
)
259 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
260 kvm_free_physmem_slot(&kvm
->memslots
[i
], 0);
263 static void kvm_free_vcpu(struct kvm_vcpu
*vcpu
)
265 kvm_arch_ops
->vcpu_free(vcpu
);
266 kvm_mmu_destroy(vcpu
);
269 static void kvm_free_vcpus(struct kvm
*kvm
)
273 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
)
274 kvm_free_vcpu(&kvm
->vcpus
[i
]);
277 static int kvm_dev_release(struct inode
*inode
, struct file
*filp
)
279 struct kvm
*kvm
= filp
->private_data
;
282 kvm_free_physmem(kvm
);
287 static void inject_gp(struct kvm_vcpu
*vcpu
)
289 kvm_arch_ops
->inject_gp(vcpu
, 0);
292 static int pdptrs_have_reserved_bits_set(struct kvm_vcpu
*vcpu
,
295 gfn_t pdpt_gfn
= cr3
>> PAGE_SHIFT
;
296 unsigned offset
= (cr3
& (PAGE_SIZE
-1)) >> 5;
300 struct kvm_memory_slot
*memslot
;
302 spin_lock(&vcpu
->kvm
->lock
);
303 memslot
= gfn_to_memslot(vcpu
->kvm
, pdpt_gfn
);
304 /* FIXME: !memslot - emulate? 0xff? */
305 pdpt
= kmap_atomic(gfn_to_page(memslot
, pdpt_gfn
), KM_USER0
);
307 for (i
= 0; i
< 4; ++i
) {
308 pdpte
= pdpt
[offset
+ i
];
309 if ((pdpte
& 1) && (pdpte
& 0xfffffff0000001e6ull
))
313 kunmap_atomic(pdpt
, KM_USER0
);
314 spin_unlock(&vcpu
->kvm
->lock
);
319 void set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
)
321 if (cr0
& CR0_RESEVED_BITS
) {
322 printk(KERN_DEBUG
"set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
328 if ((cr0
& CR0_NW_MASK
) && !(cr0
& CR0_CD_MASK
)) {
329 printk(KERN_DEBUG
"set_cr0: #GP, CD == 0 && NW == 1\n");
334 if ((cr0
& CR0_PG_MASK
) && !(cr0
& CR0_PE_MASK
)) {
335 printk(KERN_DEBUG
"set_cr0: #GP, set PG flag "
336 "and a clear PE flag\n");
341 if (!is_paging(vcpu
) && (cr0
& CR0_PG_MASK
)) {
343 if ((vcpu
->shadow_efer
& EFER_LME
)) {
347 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
348 "in long mode while PAE is disabled\n");
352 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
354 printk(KERN_DEBUG
"set_cr0: #GP, start paging "
355 "in long mode while CS.L == 1\n");
363 pdptrs_have_reserved_bits_set(vcpu
, vcpu
->cr3
)) {
364 printk(KERN_DEBUG
"set_cr0: #GP, pdptrs "
372 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
375 spin_lock(&vcpu
->kvm
->lock
);
376 kvm_mmu_reset_context(vcpu
);
377 spin_unlock(&vcpu
->kvm
->lock
);
380 EXPORT_SYMBOL_GPL(set_cr0
);
382 void lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
)
384 set_cr0(vcpu
, (vcpu
->cr0
& ~0x0ful
) | (msw
& 0x0f));
386 EXPORT_SYMBOL_GPL(lmsw
);
388 void set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr4
)
390 if (cr4
& CR4_RESEVED_BITS
) {
391 printk(KERN_DEBUG
"set_cr4: #GP, reserved bits\n");
396 if (kvm_arch_ops
->is_long_mode(vcpu
)) {
397 if (!(cr4
& CR4_PAE_MASK
)) {
398 printk(KERN_DEBUG
"set_cr4: #GP, clearing PAE while "
403 } else if (is_paging(vcpu
) && !is_pae(vcpu
) && (cr4
& CR4_PAE_MASK
)
404 && pdptrs_have_reserved_bits_set(vcpu
, vcpu
->cr3
)) {
405 printk(KERN_DEBUG
"set_cr4: #GP, pdptrs reserved bits\n");
409 if (cr4
& CR4_VMXE_MASK
) {
410 printk(KERN_DEBUG
"set_cr4: #GP, setting VMXE\n");
414 kvm_arch_ops
->set_cr4(vcpu
, cr4
);
415 spin_lock(&vcpu
->kvm
->lock
);
416 kvm_mmu_reset_context(vcpu
);
417 spin_unlock(&vcpu
->kvm
->lock
);
419 EXPORT_SYMBOL_GPL(set_cr4
);
421 void set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
423 if (kvm_arch_ops
->is_long_mode(vcpu
)) {
424 if ( cr3
& CR3_L_MODE_RESEVED_BITS
) {
425 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
430 if (cr3
& CR3_RESEVED_BITS
) {
431 printk(KERN_DEBUG
"set_cr3: #GP, reserved bits\n");
435 if (is_paging(vcpu
) && is_pae(vcpu
) &&
436 pdptrs_have_reserved_bits_set(vcpu
, cr3
)) {
437 printk(KERN_DEBUG
"set_cr3: #GP, pdptrs "
445 spin_lock(&vcpu
->kvm
->lock
);
446 vcpu
->mmu
.new_cr3(vcpu
);
447 spin_unlock(&vcpu
->kvm
->lock
);
449 EXPORT_SYMBOL_GPL(set_cr3
);
451 void set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
453 if ( cr8
& CR8_RESEVED_BITS
) {
454 printk(KERN_DEBUG
"set_cr8: #GP, reserved bits 0x%lx\n", cr8
);
460 EXPORT_SYMBOL_GPL(set_cr8
);
462 void fx_init(struct kvm_vcpu
*vcpu
)
464 struct __attribute__ ((__packed__
)) fx_image_s
{
470 u64 operand
;// fpu dp
476 fx_save(vcpu
->host_fx_image
);
478 fx_save(vcpu
->guest_fx_image
);
479 fx_restore(vcpu
->host_fx_image
);
481 fx_image
= (struct fx_image_s
*)vcpu
->guest_fx_image
;
482 fx_image
->mxcsr
= 0x1f80;
483 memset(vcpu
->guest_fx_image
+ sizeof(struct fx_image_s
),
484 0, FX_IMAGE_SIZE
- sizeof(struct fx_image_s
));
486 EXPORT_SYMBOL_GPL(fx_init
);
489 * Creates some virtual cpus. Good luck creating more than one.
491 static int kvm_dev_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
494 struct kvm_vcpu
*vcpu
;
497 if (n
< 0 || n
>= KVM_MAX_VCPUS
)
500 vcpu
= &kvm
->vcpus
[n
];
502 mutex_lock(&vcpu
->mutex
);
505 mutex_unlock(&vcpu
->mutex
);
509 vcpu
->host_fx_image
= (char*)ALIGN((hva_t
)vcpu
->fx_buf
,
511 vcpu
->guest_fx_image
= vcpu
->host_fx_image
+ FX_IMAGE_SIZE
;
513 vcpu
->cpu
= -1; /* First load will set up TR */
515 r
= kvm_arch_ops
->vcpu_create(vcpu
);
519 kvm_arch_ops
->vcpu_load(vcpu
);
521 r
= kvm_arch_ops
->vcpu_setup(vcpu
);
523 r
= kvm_mmu_init(vcpu
);
534 mutex_unlock(&vcpu
->mutex
);
540 * Allocate some memory and give it an address in the guest physical address
543 * Discontiguous memory is allowed, mostly for framebuffers.
545 static int kvm_dev_ioctl_set_memory_region(struct kvm
*kvm
,
546 struct kvm_memory_region
*mem
)
550 unsigned long npages
;
552 struct kvm_memory_slot
*memslot
;
553 struct kvm_memory_slot old
, new;
554 int memory_config_version
;
557 /* General sanity checks */
558 if (mem
->memory_size
& (PAGE_SIZE
- 1))
560 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
562 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
564 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
567 memslot
= &kvm
->memslots
[mem
->slot
];
568 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
569 npages
= mem
->memory_size
>> PAGE_SHIFT
;
572 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
575 spin_lock(&kvm
->lock
);
577 memory_config_version
= kvm
->memory_config_version
;
578 new = old
= *memslot
;
580 new.base_gfn
= base_gfn
;
582 new.flags
= mem
->flags
;
584 /* Disallow changing a memory slot's size. */
586 if (npages
&& old
.npages
&& npages
!= old
.npages
)
589 /* Check for overlaps */
591 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
592 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
596 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
597 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
601 * Do memory allocations outside lock. memory_config_version will
604 spin_unlock(&kvm
->lock
);
606 /* Deallocate if slot is being removed */
610 /* Free page dirty bitmap if unneeded */
611 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
612 new.dirty_bitmap
= 0;
616 /* Allocate if a slot is being created */
617 if (npages
&& !new.phys_mem
) {
618 new.phys_mem
= vmalloc(npages
* sizeof(struct page
*));
623 memset(new.phys_mem
, 0, npages
* sizeof(struct page
*));
624 for (i
= 0; i
< npages
; ++i
) {
625 new.phys_mem
[i
] = alloc_page(GFP_HIGHUSER
627 if (!new.phys_mem
[i
])
632 /* Allocate page dirty bitmap if needed */
633 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
634 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
636 new.dirty_bitmap
= vmalloc(dirty_bytes
);
637 if (!new.dirty_bitmap
)
639 memset(new.dirty_bitmap
, 0, dirty_bytes
);
642 spin_lock(&kvm
->lock
);
644 if (memory_config_version
!= kvm
->memory_config_version
) {
645 spin_unlock(&kvm
->lock
);
646 kvm_free_physmem_slot(&new, &old
);
654 if (mem
->slot
>= kvm
->nmemslots
)
655 kvm
->nmemslots
= mem
->slot
+ 1;
658 ++kvm
->memory_config_version
;
660 spin_unlock(&kvm
->lock
);
662 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
663 struct kvm_vcpu
*vcpu
;
665 vcpu
= vcpu_load(kvm
, i
);
668 kvm_mmu_reset_context(vcpu
);
672 kvm_free_physmem_slot(&old
, &new);
676 spin_unlock(&kvm
->lock
);
678 kvm_free_physmem_slot(&new, &old
);
684 * Get (and clear) the dirty memory log for a memory slot.
686 static int kvm_dev_ioctl_get_dirty_log(struct kvm
*kvm
,
687 struct kvm_dirty_log
*log
)
689 struct kvm_memory_slot
*memslot
;
692 unsigned long any
= 0;
694 spin_lock(&kvm
->lock
);
697 * Prevent changes to guest memory configuration even while the lock
701 spin_unlock(&kvm
->lock
);
703 if (log
->slot
>= KVM_MEMORY_SLOTS
)
706 memslot
= &kvm
->memslots
[log
->slot
];
708 if (!memslot
->dirty_bitmap
)
711 n
= ALIGN(memslot
->npages
, 8) / 8;
713 for (i
= 0; !any
&& i
< n
; ++i
)
714 any
= memslot
->dirty_bitmap
[i
];
717 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
722 spin_lock(&kvm
->lock
);
723 kvm_mmu_slot_remove_write_access(kvm
, log
->slot
);
724 spin_unlock(&kvm
->lock
);
725 memset(memslot
->dirty_bitmap
, 0, n
);
726 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
727 struct kvm_vcpu
*vcpu
= vcpu_load(kvm
, i
);
731 kvm_arch_ops
->tlb_flush(vcpu
);
739 spin_lock(&kvm
->lock
);
741 spin_unlock(&kvm
->lock
);
745 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
749 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
750 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
752 if (gfn
>= memslot
->base_gfn
753 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
758 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
760 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
763 struct kvm_memory_slot
*memslot
= 0;
764 unsigned long rel_gfn
;
766 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
767 memslot
= &kvm
->memslots
[i
];
769 if (gfn
>= memslot
->base_gfn
770 && gfn
< memslot
->base_gfn
+ memslot
->npages
) {
772 if (!memslot
|| !memslot
->dirty_bitmap
)
775 rel_gfn
= gfn
- memslot
->base_gfn
;
778 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
779 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
785 static int emulator_read_std(unsigned long addr
,
788 struct x86_emulate_ctxt
*ctxt
)
790 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
794 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
795 unsigned offset
= addr
& (PAGE_SIZE
-1);
796 unsigned tocopy
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
798 struct kvm_memory_slot
*memslot
;
801 if (gpa
== UNMAPPED_GVA
)
802 return X86EMUL_PROPAGATE_FAULT
;
803 pfn
= gpa
>> PAGE_SHIFT
;
804 memslot
= gfn_to_memslot(vcpu
->kvm
, pfn
);
806 return X86EMUL_UNHANDLEABLE
;
807 page
= kmap_atomic(gfn_to_page(memslot
, pfn
), KM_USER0
);
809 memcpy(data
, page
+ offset
, tocopy
);
811 kunmap_atomic(page
, KM_USER0
);
818 return X86EMUL_CONTINUE
;
821 static int emulator_write_std(unsigned long addr
,
824 struct x86_emulate_ctxt
*ctxt
)
826 printk(KERN_ERR
"emulator_write_std: addr %lx n %d\n",
828 return X86EMUL_UNHANDLEABLE
;
831 static int emulator_read_emulated(unsigned long addr
,
834 struct x86_emulate_ctxt
*ctxt
)
836 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
838 if (vcpu
->mmio_read_completed
) {
839 memcpy(val
, vcpu
->mmio_data
, bytes
);
840 vcpu
->mmio_read_completed
= 0;
841 return X86EMUL_CONTINUE
;
842 } else if (emulator_read_std(addr
, val
, bytes
, ctxt
)
844 return X86EMUL_CONTINUE
;
846 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
847 if (gpa
== UNMAPPED_GVA
)
848 return vcpu_printf(vcpu
, "not present\n"), X86EMUL_PROPAGATE_FAULT
;
849 vcpu
->mmio_needed
= 1;
850 vcpu
->mmio_phys_addr
= gpa
;
851 vcpu
->mmio_size
= bytes
;
852 vcpu
->mmio_is_write
= 0;
854 return X86EMUL_UNHANDLEABLE
;
858 static int emulator_write_emulated(unsigned long addr
,
861 struct x86_emulate_ctxt
*ctxt
)
863 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
864 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, addr
);
866 if (gpa
== UNMAPPED_GVA
)
867 return X86EMUL_PROPAGATE_FAULT
;
869 vcpu
->mmio_needed
= 1;
870 vcpu
->mmio_phys_addr
= gpa
;
871 vcpu
->mmio_size
= bytes
;
872 vcpu
->mmio_is_write
= 1;
873 memcpy(vcpu
->mmio_data
, &val
, bytes
);
875 return X86EMUL_CONTINUE
;
878 static int emulator_cmpxchg_emulated(unsigned long addr
,
882 struct x86_emulate_ctxt
*ctxt
)
888 printk(KERN_WARNING
"kvm: emulating exchange as write\n");
890 return emulator_write_emulated(addr
, new, bytes
, ctxt
);
893 static unsigned long get_segment_base(struct kvm_vcpu
*vcpu
, int seg
)
895 return kvm_arch_ops
->get_segment_base(vcpu
, seg
);
898 int emulate_invlpg(struct kvm_vcpu
*vcpu
, gva_t address
)
900 spin_lock(&vcpu
->kvm
->lock
);
901 vcpu
->mmu
.inval_page(vcpu
, address
);
902 spin_unlock(&vcpu
->kvm
->lock
);
903 kvm_arch_ops
->invlpg(vcpu
, address
);
904 return X86EMUL_CONTINUE
;
907 int emulate_clts(struct kvm_vcpu
*vcpu
)
909 unsigned long cr0
= vcpu
->cr0
;
912 kvm_arch_ops
->set_cr0(vcpu
, cr0
);
913 return X86EMUL_CONTINUE
;
916 int emulator_get_dr(struct x86_emulate_ctxt
* ctxt
, int dr
, unsigned long *dest
)
918 struct kvm_vcpu
*vcpu
= ctxt
->vcpu
;
922 *dest
= kvm_arch_ops
->get_dr(vcpu
, dr
);
923 return X86EMUL_CONTINUE
;
925 printk(KERN_DEBUG
"%s: unexpected dr %u\n",
927 return X86EMUL_UNHANDLEABLE
;
931 int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
, unsigned long value
)
933 unsigned long mask
= (ctxt
->mode
== X86EMUL_MODE_PROT64
) ? ~0ULL : ~0U;
936 kvm_arch_ops
->set_dr(ctxt
->vcpu
, dr
, value
& mask
, &exception
);
938 /* FIXME: better handling */
939 return X86EMUL_UNHANDLEABLE
;
941 return X86EMUL_CONTINUE
;
944 static void report_emulation_failure(struct x86_emulate_ctxt
*ctxt
)
948 unsigned long rip
= ctxt
->vcpu
->rip
;
949 unsigned long rip_linear
;
951 rip_linear
= rip
+ get_segment_base(ctxt
->vcpu
, VCPU_SREG_CS
);
956 emulator_read_std(rip_linear
, (void *)opcodes
, 4, ctxt
);
958 printk(KERN_ERR
"emulation failed but !mmio_needed?"
959 " rip %lx %02x %02x %02x %02x\n",
960 rip
, opcodes
[0], opcodes
[1], opcodes
[2], opcodes
[3]);
964 struct x86_emulate_ops emulate_ops
= {
965 .read_std
= emulator_read_std
,
966 .write_std
= emulator_write_std
,
967 .read_emulated
= emulator_read_emulated
,
968 .write_emulated
= emulator_write_emulated
,
969 .cmpxchg_emulated
= emulator_cmpxchg_emulated
,
972 int emulate_instruction(struct kvm_vcpu
*vcpu
,
977 struct x86_emulate_ctxt emulate_ctxt
;
981 kvm_arch_ops
->cache_regs(vcpu
);
983 kvm_arch_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
985 emulate_ctxt
.vcpu
= vcpu
;
986 emulate_ctxt
.eflags
= kvm_arch_ops
->get_rflags(vcpu
);
987 emulate_ctxt
.cr2
= cr2
;
988 emulate_ctxt
.mode
= (emulate_ctxt
.eflags
& X86_EFLAGS_VM
)
989 ? X86EMUL_MODE_REAL
: cs_l
990 ? X86EMUL_MODE_PROT64
: cs_db
991 ? X86EMUL_MODE_PROT32
: X86EMUL_MODE_PROT16
;
993 if (emulate_ctxt
.mode
== X86EMUL_MODE_PROT64
) {
994 emulate_ctxt
.cs_base
= 0;
995 emulate_ctxt
.ds_base
= 0;
996 emulate_ctxt
.es_base
= 0;
997 emulate_ctxt
.ss_base
= 0;
999 emulate_ctxt
.cs_base
= get_segment_base(vcpu
, VCPU_SREG_CS
);
1000 emulate_ctxt
.ds_base
= get_segment_base(vcpu
, VCPU_SREG_DS
);
1001 emulate_ctxt
.es_base
= get_segment_base(vcpu
, VCPU_SREG_ES
);
1002 emulate_ctxt
.ss_base
= get_segment_base(vcpu
, VCPU_SREG_SS
);
1005 emulate_ctxt
.gs_base
= get_segment_base(vcpu
, VCPU_SREG_GS
);
1006 emulate_ctxt
.fs_base
= get_segment_base(vcpu
, VCPU_SREG_FS
);
1008 vcpu
->mmio_is_write
= 0;
1009 r
= x86_emulate_memop(&emulate_ctxt
, &emulate_ops
);
1011 if ((r
|| vcpu
->mmio_is_write
) && run
) {
1012 run
->mmio
.phys_addr
= vcpu
->mmio_phys_addr
;
1013 memcpy(run
->mmio
.data
, vcpu
->mmio_data
, 8);
1014 run
->mmio
.len
= vcpu
->mmio_size
;
1015 run
->mmio
.is_write
= vcpu
->mmio_is_write
;
1019 if (!vcpu
->mmio_needed
) {
1020 report_emulation_failure(&emulate_ctxt
);
1021 return EMULATE_FAIL
;
1023 return EMULATE_DO_MMIO
;
1026 kvm_arch_ops
->decache_regs(vcpu
);
1027 kvm_arch_ops
->set_rflags(vcpu
, emulate_ctxt
.eflags
);
1029 if (vcpu
->mmio_is_write
)
1030 return EMULATE_DO_MMIO
;
1032 return EMULATE_DONE
;
1034 EXPORT_SYMBOL_GPL(emulate_instruction
);
1036 static u64
mk_cr_64(u64 curr_cr
, u32 new_val
)
1038 return (curr_cr
& ~((1ULL << 32) - 1)) | new_val
;
1041 void realmode_lgdt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1043 struct descriptor_table dt
= { limit
, base
};
1045 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1048 void realmode_lidt(struct kvm_vcpu
*vcpu
, u16 limit
, unsigned long base
)
1050 struct descriptor_table dt
= { limit
, base
};
1052 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1055 void realmode_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
,
1056 unsigned long *rflags
)
1059 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1062 unsigned long realmode_get_cr(struct kvm_vcpu
*vcpu
, int cr
)
1074 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1079 void realmode_set_cr(struct kvm_vcpu
*vcpu
, int cr
, unsigned long val
,
1080 unsigned long *rflags
)
1084 set_cr0(vcpu
, mk_cr_64(vcpu
->cr0
, val
));
1085 *rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1094 set_cr4(vcpu
, mk_cr_64(vcpu
->cr4
, val
));
1097 vcpu_printf(vcpu
, "%s: unexpected cr %u\n", __FUNCTION__
, cr
);
1102 * Reads an msr value (of 'msr_index') into 'pdata'.
1103 * Returns 0 on success, non-0 otherwise.
1104 * Assumes vcpu_load() was already called.
1106 static int get_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64
*pdata
)
1108 return kvm_arch_ops
->get_msr(vcpu
, msr_index
, pdata
);
1111 #ifdef CONFIG_X86_64
1113 void set_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1115 if (efer
& EFER_RESERVED_BITS
) {
1116 printk(KERN_DEBUG
"set_efer: 0x%llx #GP, reserved bits\n",
1123 && (vcpu
->shadow_efer
& EFER_LME
) != (efer
& EFER_LME
)) {
1124 printk(KERN_DEBUG
"set_efer: #GP, change LME while paging\n");
1129 kvm_arch_ops
->set_efer(vcpu
, efer
);
1132 efer
|= vcpu
->shadow_efer
& EFER_LMA
;
1134 vcpu
->shadow_efer
= efer
;
1136 EXPORT_SYMBOL_GPL(set_efer
);
1141 * Writes msr value into into the appropriate "register".
1142 * Returns 0 on success, non-0 otherwise.
1143 * Assumes vcpu_load() was already called.
1145 static int set_msr(struct kvm_vcpu
*vcpu
, u32 msr_index
, u64 data
)
1147 return kvm_arch_ops
->set_msr(vcpu
, msr_index
, data
);
1150 void kvm_resched(struct kvm_vcpu
*vcpu
)
1154 /* Cannot fail - no vcpu unplug yet. */
1155 vcpu_load(vcpu
->kvm
, vcpu_slot(vcpu
));
1157 EXPORT_SYMBOL_GPL(kvm_resched
);
1159 void load_msrs(struct vmx_msr_entry
*e
, int n
)
1163 for (i
= 0; i
< n
; ++i
)
1164 wrmsrl(e
[i
].index
, e
[i
].data
);
1166 EXPORT_SYMBOL_GPL(load_msrs
);
1168 void save_msrs(struct vmx_msr_entry
*e
, int n
)
1172 for (i
= 0; i
< n
; ++i
)
1173 rdmsrl(e
[i
].index
, e
[i
].data
);
1175 EXPORT_SYMBOL_GPL(save_msrs
);
1177 static int kvm_dev_ioctl_run(struct kvm
*kvm
, struct kvm_run
*kvm_run
)
1179 struct kvm_vcpu
*vcpu
;
1182 if (kvm_run
->vcpu
< 0 || kvm_run
->vcpu
>= KVM_MAX_VCPUS
)
1185 vcpu
= vcpu_load(kvm
, kvm_run
->vcpu
);
1189 if (kvm_run
->emulated
) {
1190 kvm_arch_ops
->skip_emulated_instruction(vcpu
);
1191 kvm_run
->emulated
= 0;
1194 if (kvm_run
->mmio_completed
) {
1195 memcpy(vcpu
->mmio_data
, kvm_run
->mmio
.data
, 8);
1196 vcpu
->mmio_read_completed
= 1;
1199 vcpu
->mmio_needed
= 0;
1201 r
= kvm_arch_ops
->run(vcpu
, kvm_run
);
1207 static int kvm_dev_ioctl_get_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1209 struct kvm_vcpu
*vcpu
;
1211 if (regs
->vcpu
< 0 || regs
->vcpu
>= KVM_MAX_VCPUS
)
1214 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1218 kvm_arch_ops
->cache_regs(vcpu
);
1220 regs
->rax
= vcpu
->regs
[VCPU_REGS_RAX
];
1221 regs
->rbx
= vcpu
->regs
[VCPU_REGS_RBX
];
1222 regs
->rcx
= vcpu
->regs
[VCPU_REGS_RCX
];
1223 regs
->rdx
= vcpu
->regs
[VCPU_REGS_RDX
];
1224 regs
->rsi
= vcpu
->regs
[VCPU_REGS_RSI
];
1225 regs
->rdi
= vcpu
->regs
[VCPU_REGS_RDI
];
1226 regs
->rsp
= vcpu
->regs
[VCPU_REGS_RSP
];
1227 regs
->rbp
= vcpu
->regs
[VCPU_REGS_RBP
];
1228 #ifdef CONFIG_X86_64
1229 regs
->r8
= vcpu
->regs
[VCPU_REGS_R8
];
1230 regs
->r9
= vcpu
->regs
[VCPU_REGS_R9
];
1231 regs
->r10
= vcpu
->regs
[VCPU_REGS_R10
];
1232 regs
->r11
= vcpu
->regs
[VCPU_REGS_R11
];
1233 regs
->r12
= vcpu
->regs
[VCPU_REGS_R12
];
1234 regs
->r13
= vcpu
->regs
[VCPU_REGS_R13
];
1235 regs
->r14
= vcpu
->regs
[VCPU_REGS_R14
];
1236 regs
->r15
= vcpu
->regs
[VCPU_REGS_R15
];
1239 regs
->rip
= vcpu
->rip
;
1240 regs
->rflags
= kvm_arch_ops
->get_rflags(vcpu
);
1243 * Don't leak debug flags in case they were set for guest debugging
1245 if (vcpu
->guest_debug
.enabled
&& vcpu
->guest_debug
.singlestep
)
1246 regs
->rflags
&= ~(X86_EFLAGS_TF
| X86_EFLAGS_RF
);
1253 static int kvm_dev_ioctl_set_regs(struct kvm
*kvm
, struct kvm_regs
*regs
)
1255 struct kvm_vcpu
*vcpu
;
1257 if (regs
->vcpu
< 0 || regs
->vcpu
>= KVM_MAX_VCPUS
)
1260 vcpu
= vcpu_load(kvm
, regs
->vcpu
);
1264 vcpu
->regs
[VCPU_REGS_RAX
] = regs
->rax
;
1265 vcpu
->regs
[VCPU_REGS_RBX
] = regs
->rbx
;
1266 vcpu
->regs
[VCPU_REGS_RCX
] = regs
->rcx
;
1267 vcpu
->regs
[VCPU_REGS_RDX
] = regs
->rdx
;
1268 vcpu
->regs
[VCPU_REGS_RSI
] = regs
->rsi
;
1269 vcpu
->regs
[VCPU_REGS_RDI
] = regs
->rdi
;
1270 vcpu
->regs
[VCPU_REGS_RSP
] = regs
->rsp
;
1271 vcpu
->regs
[VCPU_REGS_RBP
] = regs
->rbp
;
1272 #ifdef CONFIG_X86_64
1273 vcpu
->regs
[VCPU_REGS_R8
] = regs
->r8
;
1274 vcpu
->regs
[VCPU_REGS_R9
] = regs
->r9
;
1275 vcpu
->regs
[VCPU_REGS_R10
] = regs
->r10
;
1276 vcpu
->regs
[VCPU_REGS_R11
] = regs
->r11
;
1277 vcpu
->regs
[VCPU_REGS_R12
] = regs
->r12
;
1278 vcpu
->regs
[VCPU_REGS_R13
] = regs
->r13
;
1279 vcpu
->regs
[VCPU_REGS_R14
] = regs
->r14
;
1280 vcpu
->regs
[VCPU_REGS_R15
] = regs
->r15
;
1283 vcpu
->rip
= regs
->rip
;
1284 kvm_arch_ops
->set_rflags(vcpu
, regs
->rflags
);
1286 kvm_arch_ops
->decache_regs(vcpu
);
1293 static void get_segment(struct kvm_vcpu
*vcpu
,
1294 struct kvm_segment
*var
, int seg
)
1296 return kvm_arch_ops
->get_segment(vcpu
, var
, seg
);
1299 static int kvm_dev_ioctl_get_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1301 struct kvm_vcpu
*vcpu
;
1302 struct descriptor_table dt
;
1304 if (sregs
->vcpu
< 0 || sregs
->vcpu
>= KVM_MAX_VCPUS
)
1306 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1310 get_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1311 get_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1312 get_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1313 get_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1314 get_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1315 get_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1317 get_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1318 get_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1320 kvm_arch_ops
->get_idt(vcpu
, &dt
);
1321 sregs
->idt
.limit
= dt
.limit
;
1322 sregs
->idt
.base
= dt
.base
;
1323 kvm_arch_ops
->get_gdt(vcpu
, &dt
);
1324 sregs
->gdt
.limit
= dt
.limit
;
1325 sregs
->gdt
.base
= dt
.base
;
1327 sregs
->cr0
= vcpu
->cr0
;
1328 sregs
->cr2
= vcpu
->cr2
;
1329 sregs
->cr3
= vcpu
->cr3
;
1330 sregs
->cr4
= vcpu
->cr4
;
1331 sregs
->cr8
= vcpu
->cr8
;
1332 sregs
->efer
= vcpu
->shadow_efer
;
1333 sregs
->apic_base
= vcpu
->apic_base
;
1335 memcpy(sregs
->interrupt_bitmap
, vcpu
->irq_pending
,
1336 sizeof sregs
->interrupt_bitmap
);
1343 static void set_segment(struct kvm_vcpu
*vcpu
,
1344 struct kvm_segment
*var
, int seg
)
1346 return kvm_arch_ops
->set_segment(vcpu
, var
, seg
);
1349 static int kvm_dev_ioctl_set_sregs(struct kvm
*kvm
, struct kvm_sregs
*sregs
)
1351 struct kvm_vcpu
*vcpu
;
1352 int mmu_reset_needed
= 0;
1354 struct descriptor_table dt
;
1356 if (sregs
->vcpu
< 0 || sregs
->vcpu
>= KVM_MAX_VCPUS
)
1358 vcpu
= vcpu_load(kvm
, sregs
->vcpu
);
1362 set_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
1363 set_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
1364 set_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
1365 set_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
1366 set_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
1367 set_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
1369 set_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
1370 set_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
1372 dt
.limit
= sregs
->idt
.limit
;
1373 dt
.base
= sregs
->idt
.base
;
1374 kvm_arch_ops
->set_idt(vcpu
, &dt
);
1375 dt
.limit
= sregs
->gdt
.limit
;
1376 dt
.base
= sregs
->gdt
.base
;
1377 kvm_arch_ops
->set_gdt(vcpu
, &dt
);
1379 vcpu
->cr2
= sregs
->cr2
;
1380 mmu_reset_needed
|= vcpu
->cr3
!= sregs
->cr3
;
1381 vcpu
->cr3
= sregs
->cr3
;
1383 vcpu
->cr8
= sregs
->cr8
;
1385 mmu_reset_needed
|= vcpu
->shadow_efer
!= sregs
->efer
;
1386 #ifdef CONFIG_X86_64
1387 kvm_arch_ops
->set_efer(vcpu
, sregs
->efer
);
1389 vcpu
->apic_base
= sregs
->apic_base
;
1391 mmu_reset_needed
|= vcpu
->cr0
!= sregs
->cr0
;
1392 kvm_arch_ops
->set_cr0_no_modeswitch(vcpu
, sregs
->cr0
);
1394 mmu_reset_needed
|= vcpu
->cr4
!= sregs
->cr4
;
1395 kvm_arch_ops
->set_cr4(vcpu
, sregs
->cr4
);
1397 if (mmu_reset_needed
)
1398 kvm_mmu_reset_context(vcpu
);
1400 memcpy(vcpu
->irq_pending
, sregs
->interrupt_bitmap
,
1401 sizeof vcpu
->irq_pending
);
1402 vcpu
->irq_summary
= 0;
1403 for (i
= 0; i
< NR_IRQ_WORDS
; ++i
)
1404 if (vcpu
->irq_pending
[i
])
1405 __set_bit(i
, &vcpu
->irq_summary
);
1413 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1414 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1416 static u32 msrs_to_save
[] = {
1417 MSR_IA32_SYSENTER_CS
, MSR_IA32_SYSENTER_ESP
, MSR_IA32_SYSENTER_EIP
,
1419 #ifdef CONFIG_X86_64
1420 MSR_CSTAR
, MSR_KERNEL_GS_BASE
, MSR_SYSCALL_MASK
, MSR_LSTAR
,
1422 MSR_IA32_TIME_STAMP_COUNTER
,
1427 * Adapt set_msr() to msr_io()'s calling convention
1429 static int do_set_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1431 return set_msr(vcpu
, index
, *data
);
1435 * Read or write a bunch of msrs. All parameters are kernel addresses.
1437 * @return number of msrs set successfully.
1439 static int __msr_io(struct kvm
*kvm
, struct kvm_msrs
*msrs
,
1440 struct kvm_msr_entry
*entries
,
1441 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1442 unsigned index
, u64
*data
))
1444 struct kvm_vcpu
*vcpu
;
1447 if (msrs
->vcpu
< 0 || msrs
->vcpu
>= KVM_MAX_VCPUS
)
1450 vcpu
= vcpu_load(kvm
, msrs
->vcpu
);
1454 for (i
= 0; i
< msrs
->nmsrs
; ++i
)
1455 if (do_msr(vcpu
, entries
[i
].index
, &entries
[i
].data
))
1464 * Read or write a bunch of msrs. Parameters are user addresses.
1466 * @return number of msrs set successfully.
1468 static int msr_io(struct kvm
*kvm
, struct kvm_msrs __user
*user_msrs
,
1469 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
1470 unsigned index
, u64
*data
),
1473 struct kvm_msrs msrs
;
1474 struct kvm_msr_entry
*entries
;
1479 if (copy_from_user(&msrs
, user_msrs
, sizeof msrs
))
1483 if (msrs
.nmsrs
>= MAX_IO_MSRS
)
1487 size
= sizeof(struct kvm_msr_entry
) * msrs
.nmsrs
;
1488 entries
= vmalloc(size
);
1493 if (copy_from_user(entries
, user_msrs
->entries
, size
))
1496 r
= n
= __msr_io(kvm
, &msrs
, entries
, do_msr
);
1501 if (writeback
&& copy_to_user(user_msrs
->entries
, entries
, size
))
1513 * Translate a guest virtual address to a guest physical address.
1515 static int kvm_dev_ioctl_translate(struct kvm
*kvm
, struct kvm_translation
*tr
)
1517 unsigned long vaddr
= tr
->linear_address
;
1518 struct kvm_vcpu
*vcpu
;
1521 vcpu
= vcpu_load(kvm
, tr
->vcpu
);
1524 spin_lock(&kvm
->lock
);
1525 gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, vaddr
);
1526 tr
->physical_address
= gpa
;
1527 tr
->valid
= gpa
!= UNMAPPED_GVA
;
1530 spin_unlock(&kvm
->lock
);
1536 static int kvm_dev_ioctl_interrupt(struct kvm
*kvm
, struct kvm_interrupt
*irq
)
1538 struct kvm_vcpu
*vcpu
;
1540 if (irq
->vcpu
< 0 || irq
->vcpu
>= KVM_MAX_VCPUS
)
1542 if (irq
->irq
< 0 || irq
->irq
>= 256)
1544 vcpu
= vcpu_load(kvm
, irq
->vcpu
);
1548 set_bit(irq
->irq
, vcpu
->irq_pending
);
1549 set_bit(irq
->irq
/ BITS_PER_LONG
, &vcpu
->irq_summary
);
1556 static int kvm_dev_ioctl_debug_guest(struct kvm
*kvm
,
1557 struct kvm_debug_guest
*dbg
)
1559 struct kvm_vcpu
*vcpu
;
1562 if (dbg
->vcpu
< 0 || dbg
->vcpu
>= KVM_MAX_VCPUS
)
1564 vcpu
= vcpu_load(kvm
, dbg
->vcpu
);
1568 r
= kvm_arch_ops
->set_guest_debug(vcpu
, dbg
);
1575 static long kvm_dev_ioctl(struct file
*filp
,
1576 unsigned int ioctl
, unsigned long arg
)
1578 struct kvm
*kvm
= filp
->private_data
;
1582 case KVM_CREATE_VCPU
: {
1583 r
= kvm_dev_ioctl_create_vcpu(kvm
, arg
);
1589 struct kvm_run kvm_run
;
1592 if (copy_from_user(&kvm_run
, (void *)arg
, sizeof kvm_run
))
1594 r
= kvm_dev_ioctl_run(kvm
, &kvm_run
);
1598 if (copy_to_user((void *)arg
, &kvm_run
, sizeof kvm_run
))
1603 case KVM_GET_REGS
: {
1604 struct kvm_regs kvm_regs
;
1607 if (copy_from_user(&kvm_regs
, (void *)arg
, sizeof kvm_regs
))
1609 r
= kvm_dev_ioctl_get_regs(kvm
, &kvm_regs
);
1613 if (copy_to_user((void *)arg
, &kvm_regs
, sizeof kvm_regs
))
1618 case KVM_SET_REGS
: {
1619 struct kvm_regs kvm_regs
;
1622 if (copy_from_user(&kvm_regs
, (void *)arg
, sizeof kvm_regs
))
1624 r
= kvm_dev_ioctl_set_regs(kvm
, &kvm_regs
);
1630 case KVM_GET_SREGS
: {
1631 struct kvm_sregs kvm_sregs
;
1634 if (copy_from_user(&kvm_sregs
, (void *)arg
, sizeof kvm_sregs
))
1636 r
= kvm_dev_ioctl_get_sregs(kvm
, &kvm_sregs
);
1640 if (copy_to_user((void *)arg
, &kvm_sregs
, sizeof kvm_sregs
))
1645 case KVM_SET_SREGS
: {
1646 struct kvm_sregs kvm_sregs
;
1649 if (copy_from_user(&kvm_sregs
, (void *)arg
, sizeof kvm_sregs
))
1651 r
= kvm_dev_ioctl_set_sregs(kvm
, &kvm_sregs
);
1657 case KVM_TRANSLATE
: {
1658 struct kvm_translation tr
;
1661 if (copy_from_user(&tr
, (void *)arg
, sizeof tr
))
1663 r
= kvm_dev_ioctl_translate(kvm
, &tr
);
1667 if (copy_to_user((void *)arg
, &tr
, sizeof tr
))
1672 case KVM_INTERRUPT
: {
1673 struct kvm_interrupt irq
;
1676 if (copy_from_user(&irq
, (void *)arg
, sizeof irq
))
1678 r
= kvm_dev_ioctl_interrupt(kvm
, &irq
);
1684 case KVM_DEBUG_GUEST
: {
1685 struct kvm_debug_guest dbg
;
1688 if (copy_from_user(&dbg
, (void *)arg
, sizeof dbg
))
1690 r
= kvm_dev_ioctl_debug_guest(kvm
, &dbg
);
1696 case KVM_SET_MEMORY_REGION
: {
1697 struct kvm_memory_region kvm_mem
;
1700 if (copy_from_user(&kvm_mem
, (void *)arg
, sizeof kvm_mem
))
1702 r
= kvm_dev_ioctl_set_memory_region(kvm
, &kvm_mem
);
1707 case KVM_GET_DIRTY_LOG
: {
1708 struct kvm_dirty_log log
;
1711 if (copy_from_user(&log
, (void *)arg
, sizeof log
))
1713 r
= kvm_dev_ioctl_get_dirty_log(kvm
, &log
);
1719 r
= msr_io(kvm
, (void __user
*)arg
, get_msr
, 1);
1722 r
= msr_io(kvm
, (void __user
*)arg
, do_set_msr
, 0);
1724 case KVM_GET_MSR_INDEX_LIST
: {
1725 struct kvm_msr_list __user
*user_msr_list
= (void __user
*)arg
;
1726 struct kvm_msr_list msr_list
;
1730 if (copy_from_user(&msr_list
, user_msr_list
, sizeof msr_list
))
1733 msr_list
.nmsrs
= ARRAY_SIZE(msrs_to_save
);
1734 if (copy_to_user(user_msr_list
, &msr_list
, sizeof msr_list
))
1737 if (n
< ARRAY_SIZE(msrs_to_save
))
1740 if (copy_to_user(user_msr_list
->indices
, &msrs_to_save
,
1741 sizeof msrs_to_save
))
1752 static struct page
*kvm_dev_nopage(struct vm_area_struct
*vma
,
1753 unsigned long address
,
1756 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1757 unsigned long pgoff
;
1758 struct kvm_memory_slot
*slot
;
1761 *type
= VM_FAULT_MINOR
;
1762 pgoff
= ((address
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1763 slot
= gfn_to_memslot(kvm
, pgoff
);
1765 return NOPAGE_SIGBUS
;
1766 page
= gfn_to_page(slot
, pgoff
);
1768 return NOPAGE_SIGBUS
;
1773 static struct vm_operations_struct kvm_dev_vm_ops
= {
1774 .nopage
= kvm_dev_nopage
,
1777 static int kvm_dev_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1779 vma
->vm_ops
= &kvm_dev_vm_ops
;
1783 static struct file_operations kvm_chardev_ops
= {
1784 .open
= kvm_dev_open
,
1785 .release
= kvm_dev_release
,
1786 .unlocked_ioctl
= kvm_dev_ioctl
,
1787 .compat_ioctl
= kvm_dev_ioctl
,
1788 .mmap
= kvm_dev_mmap
,
1791 static struct miscdevice kvm_dev
= {
1797 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1800 if (val
== SYS_RESTART
) {
1802 * Some (well, at least mine) BIOSes hang on reboot if
1805 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1806 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1811 static struct notifier_block kvm_reboot_notifier
= {
1812 .notifier_call
= kvm_reboot
,
1816 static __init
void kvm_init_debug(void)
1818 struct kvm_stats_debugfs_item
*p
;
1820 debugfs_dir
= debugfs_create_dir("kvm", 0);
1821 for (p
= debugfs_entries
; p
->name
; ++p
)
1822 p
->dentry
= debugfs_create_u32(p
->name
, 0444, debugfs_dir
,
1826 static void kvm_exit_debug(void)
1828 struct kvm_stats_debugfs_item
*p
;
1830 for (p
= debugfs_entries
; p
->name
; ++p
)
1831 debugfs_remove(p
->dentry
);
1832 debugfs_remove(debugfs_dir
);
1835 hpa_t bad_page_address
;
1837 int kvm_init_arch(struct kvm_arch_ops
*ops
, struct module
*module
)
1843 if (!kvm_arch_ops
->cpu_has_kvm_support()) {
1844 printk(KERN_ERR
"kvm: no hardware support\n");
1847 if (kvm_arch_ops
->disabled_by_bios()) {
1848 printk(KERN_ERR
"kvm: disabled by bios\n");
1852 r
= kvm_arch_ops
->hardware_setup();
1856 on_each_cpu(kvm_arch_ops
->hardware_enable
, 0, 0, 1);
1857 register_reboot_notifier(&kvm_reboot_notifier
);
1859 kvm_chardev_ops
.owner
= module
;
1861 r
= misc_register(&kvm_dev
);
1863 printk (KERN_ERR
"kvm: misc device register failed\n");
1870 unregister_reboot_notifier(&kvm_reboot_notifier
);
1871 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1872 kvm_arch_ops
->hardware_unsetup();
1876 void kvm_exit_arch(void)
1878 misc_deregister(&kvm_dev
);
1880 unregister_reboot_notifier(&kvm_reboot_notifier
);
1881 on_each_cpu(kvm_arch_ops
->hardware_disable
, 0, 0, 1);
1882 kvm_arch_ops
->hardware_unsetup();
1885 static __init
int kvm_init(void)
1887 static struct page
*bad_page
;
1892 if ((bad_page
= alloc_page(GFP_KERNEL
)) == NULL
) {
1897 bad_page_address
= page_to_pfn(bad_page
) << PAGE_SHIFT
;
1898 memset(__va(bad_page_address
), 0, PAGE_SIZE
);
1907 static __exit
void kvm_exit(void)
1910 __free_page(pfn_to_page(bad_page_address
>> PAGE_SHIFT
));
1913 module_init(kvm_init
)
1914 module_exit(kvm_exit
)
1916 EXPORT_SYMBOL_GPL(kvm_init_arch
);
1917 EXPORT_SYMBOL_GPL(kvm_exit_arch
);