4 * Copyright IBM, Corp. 2008
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
16 #include <sys/types.h>
17 #include <sys/ioctl.h>
21 #include <linux/kvm.h>
23 #include "qemu-common.h"
24 #include "qemu-barrier.h"
32 /* This check must be after config-host.h is included */
34 #include <sys/eventfd.h>
37 /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
38 #define PAGE_SIZE TARGET_PAGE_SIZE
43 #define DPRINTF(fmt, ...) \
44 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
46 #define DPRINTF(fmt, ...) \
50 typedef struct KVMSlot
52 target_phys_addr_t start_addr
;
53 ram_addr_t memory_size
;
59 typedef struct kvm_dirty_log KVMDirtyLog
;
67 struct kvm_coalesced_mmio_ring
*coalesced_mmio_ring
;
68 bool coalesced_flush_in_progress
;
69 int broken_set_mem_region
;
72 int robust_singlestep
;
74 #ifdef KVM_CAP_SET_GUEST_DEBUG
75 struct kvm_sw_breakpoint_head kvm_sw_breakpoints
;
77 int irqchip_in_kernel
;
85 static const KVMCapabilityInfo kvm_required_capabilites
[] = {
86 KVM_CAP_INFO(USER_MEMORY
),
87 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS
),
91 static KVMSlot
*kvm_alloc_slot(KVMState
*s
)
95 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
96 if (s
->slots
[i
].memory_size
== 0) {
101 fprintf(stderr
, "%s: no free slot available\n", __func__
);
105 static KVMSlot
*kvm_lookup_matching_slot(KVMState
*s
,
106 target_phys_addr_t start_addr
,
107 target_phys_addr_t end_addr
)
111 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
112 KVMSlot
*mem
= &s
->slots
[i
];
114 if (start_addr
== mem
->start_addr
&&
115 end_addr
== mem
->start_addr
+ mem
->memory_size
) {
124 * Find overlapping slot with lowest start address
126 static KVMSlot
*kvm_lookup_overlapping_slot(KVMState
*s
,
127 target_phys_addr_t start_addr
,
128 target_phys_addr_t end_addr
)
130 KVMSlot
*found
= NULL
;
133 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
134 KVMSlot
*mem
= &s
->slots
[i
];
136 if (mem
->memory_size
== 0 ||
137 (found
&& found
->start_addr
< mem
->start_addr
)) {
141 if (end_addr
> mem
->start_addr
&&
142 start_addr
< mem
->start_addr
+ mem
->memory_size
) {
150 int kvm_physical_memory_addr_from_host(KVMState
*s
, void *ram
,
151 target_phys_addr_t
*phys_addr
)
155 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
156 KVMSlot
*mem
= &s
->slots
[i
];
158 if (ram
>= mem
->ram
&& ram
< mem
->ram
+ mem
->memory_size
) {
159 *phys_addr
= mem
->start_addr
+ (ram
- mem
->ram
);
167 static int kvm_set_user_memory_region(KVMState
*s
, KVMSlot
*slot
)
169 struct kvm_userspace_memory_region mem
;
171 mem
.slot
= slot
->slot
;
172 mem
.guest_phys_addr
= slot
->start_addr
;
173 mem
.memory_size
= slot
->memory_size
;
174 mem
.userspace_addr
= (unsigned long)slot
->ram
;
175 mem
.flags
= slot
->flags
;
176 if (s
->migration_log
) {
177 mem
.flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
179 return kvm_vm_ioctl(s
, KVM_SET_USER_MEMORY_REGION
, &mem
);
182 static void kvm_reset_vcpu(void *opaque
)
184 CPUState
*env
= opaque
;
186 kvm_arch_reset_vcpu(env
);
189 int kvm_irqchip_in_kernel(void)
191 return kvm_state
->irqchip_in_kernel
;
194 int kvm_pit_in_kernel(void)
196 return kvm_state
->pit_in_kernel
;
199 int kvm_init_vcpu(CPUState
*env
)
201 KVMState
*s
= kvm_state
;
205 DPRINTF("kvm_init_vcpu\n");
207 ret
= kvm_vm_ioctl(s
, KVM_CREATE_VCPU
, env
->cpu_index
);
209 DPRINTF("kvm_create_vcpu failed\n");
215 env
->kvm_vcpu_dirty
= 1;
217 mmap_size
= kvm_ioctl(s
, KVM_GET_VCPU_MMAP_SIZE
, 0);
220 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
224 env
->kvm_run
= mmap(NULL
, mmap_size
, PROT_READ
| PROT_WRITE
, MAP_SHARED
,
226 if (env
->kvm_run
== MAP_FAILED
) {
228 DPRINTF("mmap'ing vcpu state failed\n");
232 if (s
->coalesced_mmio
&& !s
->coalesced_mmio_ring
) {
233 s
->coalesced_mmio_ring
=
234 (void *)env
->kvm_run
+ s
->coalesced_mmio
* PAGE_SIZE
;
237 ret
= kvm_arch_init_vcpu(env
);
239 qemu_register_reset(kvm_reset_vcpu
, env
);
240 kvm_arch_reset_vcpu(env
);
247 * dirty pages logging control
250 static int kvm_mem_flags(KVMState
*s
, bool log_dirty
)
252 return log_dirty
? KVM_MEM_LOG_DIRTY_PAGES
: 0;
255 static int kvm_slot_dirty_pages_log_change(KVMSlot
*mem
, bool log_dirty
)
257 KVMState
*s
= kvm_state
;
258 int flags
, mask
= KVM_MEM_LOG_DIRTY_PAGES
;
261 old_flags
= mem
->flags
;
263 flags
= (mem
->flags
& ~mask
) | kvm_mem_flags(s
, log_dirty
);
266 /* If nothing changed effectively, no need to issue ioctl */
267 if (s
->migration_log
) {
268 flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
271 if (flags
== old_flags
) {
275 return kvm_set_user_memory_region(s
, mem
);
278 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr
,
279 ram_addr_t size
, bool log_dirty
)
281 KVMState
*s
= kvm_state
;
282 KVMSlot
*mem
= kvm_lookup_matching_slot(s
, phys_addr
, phys_addr
+ size
);
285 fprintf(stderr
, "BUG: %s: invalid parameters " TARGET_FMT_plx
"-"
286 TARGET_FMT_plx
"\n", __func__
, phys_addr
,
287 (target_phys_addr_t
)(phys_addr
+ size
- 1));
290 return kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
293 static void kvm_log_start(MemoryListener
*listener
,
294 MemoryRegionSection
*section
)
298 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
299 section
->size
, true);
305 static void kvm_log_stop(MemoryListener
*listener
,
306 MemoryRegionSection
*section
)
310 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
311 section
->size
, false);
317 static int kvm_set_migration_log(int enable
)
319 KVMState
*s
= kvm_state
;
323 s
->migration_log
= enable
;
325 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
328 if (!mem
->memory_size
) {
331 if (!!(mem
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) == enable
) {
334 err
= kvm_set_user_memory_region(s
, mem
);
342 /* get kvm's dirty pages bitmap and update qemu's */
343 static int kvm_get_dirty_pages_log_range(unsigned long start_addr
,
344 unsigned long *bitmap
,
345 unsigned long offset
,
346 unsigned long mem_size
)
349 unsigned long page_number
, addr
, addr1
, c
;
351 unsigned int len
= ((mem_size
/ TARGET_PAGE_SIZE
) + HOST_LONG_BITS
- 1) /
355 * bitmap-traveling is faster than memory-traveling (for addr...)
356 * especially when most of the memory is not dirty.
358 for (i
= 0; i
< len
; i
++) {
359 if (bitmap
[i
] != 0) {
360 c
= leul_to_cpu(bitmap
[i
]);
364 page_number
= i
* HOST_LONG_BITS
+ j
;
365 addr1
= page_number
* TARGET_PAGE_SIZE
;
366 addr
= offset
+ addr1
;
367 ram_addr
= cpu_get_physical_page_desc(addr
);
368 cpu_physical_memory_set_dirty(ram_addr
);
375 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
378 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
379 * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
380 * This means all bits are set to dirty.
382 * @start_add: start of logged region.
383 * @end_addr: end of logged region.
385 static int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr
,
386 target_phys_addr_t end_addr
)
388 KVMState
*s
= kvm_state
;
389 unsigned long size
, allocated_size
= 0;
394 d
.dirty_bitmap
= NULL
;
395 while (start_addr
< end_addr
) {
396 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, end_addr
);
401 /* XXX bad kernel interface alert
402 * For dirty bitmap, kernel allocates array of size aligned to
403 * bits-per-long. But for case when the kernel is 64bits and
404 * the userspace is 32bits, userspace can't align to the same
405 * bits-per-long, since sizeof(long) is different between kernel
406 * and user space. This way, userspace will provide buffer which
407 * may be 4 bytes less than the kernel will use, resulting in
408 * userspace memory corruption (which is not detectable by valgrind
409 * too, in most cases).
410 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
411 * a hope that sizeof(long) wont become >8 any time soon.
413 size
= ALIGN(((mem
->memory_size
) >> TARGET_PAGE_BITS
),
414 /*HOST_LONG_BITS*/ 64) / 8;
415 if (!d
.dirty_bitmap
) {
416 d
.dirty_bitmap
= g_malloc(size
);
417 } else if (size
> allocated_size
) {
418 d
.dirty_bitmap
= g_realloc(d
.dirty_bitmap
, size
);
420 allocated_size
= size
;
421 memset(d
.dirty_bitmap
, 0, allocated_size
);
425 if (kvm_vm_ioctl(s
, KVM_GET_DIRTY_LOG
, &d
) == -1) {
426 DPRINTF("ioctl failed %d\n", errno
);
431 kvm_get_dirty_pages_log_range(mem
->start_addr
, d
.dirty_bitmap
,
432 mem
->start_addr
, mem
->memory_size
);
433 start_addr
= mem
->start_addr
+ mem
->memory_size
;
435 g_free(d
.dirty_bitmap
);
440 int kvm_coalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
443 KVMState
*s
= kvm_state
;
445 if (s
->coalesced_mmio
) {
446 struct kvm_coalesced_mmio_zone zone
;
451 ret
= kvm_vm_ioctl(s
, KVM_REGISTER_COALESCED_MMIO
, &zone
);
457 int kvm_uncoalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
460 KVMState
*s
= kvm_state
;
462 if (s
->coalesced_mmio
) {
463 struct kvm_coalesced_mmio_zone zone
;
468 ret
= kvm_vm_ioctl(s
, KVM_UNREGISTER_COALESCED_MMIO
, &zone
);
474 int kvm_check_extension(KVMState
*s
, unsigned int extension
)
478 ret
= kvm_ioctl(s
, KVM_CHECK_EXTENSION
, extension
);
486 static int kvm_check_many_ioeventfds(void)
488 /* Userspace can use ioeventfd for io notification. This requires a host
489 * that supports eventfd(2) and an I/O thread; since eventfd does not
490 * support SIGIO it cannot interrupt the vcpu.
492 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
493 * can avoid creating too many ioeventfds.
495 #if defined(CONFIG_EVENTFD)
498 for (i
= 0; i
< ARRAY_SIZE(ioeventfds
); i
++) {
499 ioeventfds
[i
] = eventfd(0, EFD_CLOEXEC
);
500 if (ioeventfds
[i
] < 0) {
503 ret
= kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, true);
505 close(ioeventfds
[i
]);
510 /* Decide whether many devices are supported or not */
511 ret
= i
== ARRAY_SIZE(ioeventfds
);
514 kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, false);
515 close(ioeventfds
[i
]);
523 static const KVMCapabilityInfo
*
524 kvm_check_extension_list(KVMState
*s
, const KVMCapabilityInfo
*list
)
527 if (!kvm_check_extension(s
, list
->value
)) {
535 static void kvm_set_phys_mem(MemoryRegionSection
*section
, bool add
)
537 KVMState
*s
= kvm_state
;
540 MemoryRegion
*mr
= section
->mr
;
541 bool log_dirty
= memory_region_is_logging(mr
);
542 target_phys_addr_t start_addr
= section
->offset_within_address_space
;
543 ram_addr_t size
= section
->size
;
546 /* kvm works in page size chunks, but the function may be called
547 with sub-page size and unaligned start address. */
548 size
= TARGET_PAGE_ALIGN(size
);
549 start_addr
= TARGET_PAGE_ALIGN(start_addr
);
551 if (!memory_region_is_ram(mr
)) {
555 ram
= memory_region_get_ram_ptr(mr
) + section
->offset_within_region
;
558 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, start_addr
+ size
);
563 if (add
&& start_addr
>= mem
->start_addr
&&
564 (start_addr
+ size
<= mem
->start_addr
+ mem
->memory_size
) &&
565 (ram
- start_addr
== mem
->ram
- mem
->start_addr
)) {
566 /* The new slot fits into the existing one and comes with
567 * identical parameters - update flags and done. */
568 kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
574 /* unregister the overlapping slot */
575 mem
->memory_size
= 0;
576 err
= kvm_set_user_memory_region(s
, mem
);
578 fprintf(stderr
, "%s: error unregistering overlapping slot: %s\n",
579 __func__
, strerror(-err
));
583 /* Workaround for older KVM versions: we can't join slots, even not by
584 * unregistering the previous ones and then registering the larger
585 * slot. We have to maintain the existing fragmentation. Sigh.
587 * This workaround assumes that the new slot starts at the same
588 * address as the first existing one. If not or if some overlapping
589 * slot comes around later, we will fail (not seen in practice so far)
590 * - and actually require a recent KVM version. */
591 if (s
->broken_set_mem_region
&&
592 old
.start_addr
== start_addr
&& old
.memory_size
< size
&& add
) {
593 mem
= kvm_alloc_slot(s
);
594 mem
->memory_size
= old
.memory_size
;
595 mem
->start_addr
= old
.start_addr
;
597 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
599 err
= kvm_set_user_memory_region(s
, mem
);
601 fprintf(stderr
, "%s: error updating slot: %s\n", __func__
,
606 start_addr
+= old
.memory_size
;
607 ram
+= old
.memory_size
;
608 size
-= old
.memory_size
;
612 /* register prefix slot */
613 if (old
.start_addr
< start_addr
) {
614 mem
= kvm_alloc_slot(s
);
615 mem
->memory_size
= start_addr
- old
.start_addr
;
616 mem
->start_addr
= old
.start_addr
;
618 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
620 err
= kvm_set_user_memory_region(s
, mem
);
622 fprintf(stderr
, "%s: error registering prefix slot: %s\n",
623 __func__
, strerror(-err
));
625 fprintf(stderr
, "%s: This is probably because your kernel's " \
626 "PAGE_SIZE is too big. Please try to use 4k " \
627 "PAGE_SIZE!\n", __func__
);
633 /* register suffix slot */
634 if (old
.start_addr
+ old
.memory_size
> start_addr
+ size
) {
635 ram_addr_t size_delta
;
637 mem
= kvm_alloc_slot(s
);
638 mem
->start_addr
= start_addr
+ size
;
639 size_delta
= mem
->start_addr
- old
.start_addr
;
640 mem
->memory_size
= old
.memory_size
- size_delta
;
641 mem
->ram
= old
.ram
+ size_delta
;
642 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
644 err
= kvm_set_user_memory_region(s
, mem
);
646 fprintf(stderr
, "%s: error registering suffix slot: %s\n",
647 __func__
, strerror(-err
));
653 /* in case the KVM bug workaround already "consumed" the new slot */
660 mem
= kvm_alloc_slot(s
);
661 mem
->memory_size
= size
;
662 mem
->start_addr
= start_addr
;
664 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
666 err
= kvm_set_user_memory_region(s
, mem
);
668 fprintf(stderr
, "%s: error registering slot: %s\n", __func__
,
674 static void kvm_region_add(MemoryListener
*listener
,
675 MemoryRegionSection
*section
)
677 kvm_set_phys_mem(section
, true);
680 static void kvm_region_del(MemoryListener
*listener
,
681 MemoryRegionSection
*section
)
683 kvm_set_phys_mem(section
, false);
686 static void kvm_log_sync(MemoryListener
*listener
,
687 MemoryRegionSection
*section
)
689 target_phys_addr_t start
= section
->offset_within_address_space
;
690 target_phys_addr_t end
= start
+ section
->size
;
693 r
= kvm_physical_sync_dirty_bitmap(start
, end
);
699 static void kvm_log_global_start(struct MemoryListener
*listener
)
703 r
= kvm_set_migration_log(1);
707 static void kvm_log_global_stop(struct MemoryListener
*listener
)
711 r
= kvm_set_migration_log(0);
715 static MemoryListener kvm_memory_listener
= {
716 .region_add
= kvm_region_add
,
717 .region_del
= kvm_region_del
,
718 .log_start
= kvm_log_start
,
719 .log_stop
= kvm_log_stop
,
720 .log_sync
= kvm_log_sync
,
721 .log_global_start
= kvm_log_global_start
,
722 .log_global_stop
= kvm_log_global_stop
,
725 static void kvm_handle_interrupt(CPUState
*env
, int mask
)
727 env
->interrupt_request
|= mask
;
729 if (!qemu_cpu_is_self(env
)) {
736 static const char upgrade_note
[] =
737 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
738 "(see http://sourceforge.net/projects/kvm).\n";
740 const KVMCapabilityInfo
*missing_cap
;
744 s
= g_malloc0(sizeof(KVMState
));
746 #ifdef KVM_CAP_SET_GUEST_DEBUG
747 QTAILQ_INIT(&s
->kvm_sw_breakpoints
);
749 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
750 s
->slots
[i
].slot
= i
;
753 s
->fd
= qemu_open("/dev/kvm", O_RDWR
);
755 fprintf(stderr
, "Could not access KVM kernel module: %m\n");
760 ret
= kvm_ioctl(s
, KVM_GET_API_VERSION
, 0);
761 if (ret
< KVM_API_VERSION
) {
765 fprintf(stderr
, "kvm version too old\n");
769 if (ret
> KVM_API_VERSION
) {
771 fprintf(stderr
, "kvm version not supported\n");
775 s
->vmfd
= kvm_ioctl(s
, KVM_CREATE_VM
, 0);
778 fprintf(stderr
, "Please add the 'switch_amode' kernel parameter to "
779 "your host kernel command line\n");
785 missing_cap
= kvm_check_extension_list(s
, kvm_required_capabilites
);
788 kvm_check_extension_list(s
, kvm_arch_required_capabilities
);
792 fprintf(stderr
, "kvm does not support %s\n%s",
793 missing_cap
->name
, upgrade_note
);
797 s
->coalesced_mmio
= kvm_check_extension(s
, KVM_CAP_COALESCED_MMIO
);
799 s
->broken_set_mem_region
= 1;
800 ret
= kvm_check_extension(s
, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
);
802 s
->broken_set_mem_region
= 0;
805 #ifdef KVM_CAP_VCPU_EVENTS
806 s
->vcpu_events
= kvm_check_extension(s
, KVM_CAP_VCPU_EVENTS
);
809 s
->robust_singlestep
=
810 kvm_check_extension(s
, KVM_CAP_X86_ROBUST_SINGLESTEP
);
812 #ifdef KVM_CAP_DEBUGREGS
813 s
->debugregs
= kvm_check_extension(s
, KVM_CAP_DEBUGREGS
);
817 s
->xsave
= kvm_check_extension(s
, KVM_CAP_XSAVE
);
821 s
->xcrs
= kvm_check_extension(s
, KVM_CAP_XCRS
);
824 ret
= kvm_arch_init(s
);
830 memory_listener_register(&kvm_memory_listener
);
832 s
->many_ioeventfds
= kvm_check_many_ioeventfds();
834 cpu_interrupt_handler
= kvm_handle_interrupt
;
852 static void kvm_handle_io(uint16_t port
, void *data
, int direction
, int size
,
858 for (i
= 0; i
< count
; i
++) {
859 if (direction
== KVM_EXIT_IO_IN
) {
862 stb_p(ptr
, cpu_inb(port
));
865 stw_p(ptr
, cpu_inw(port
));
868 stl_p(ptr
, cpu_inl(port
));
874 cpu_outb(port
, ldub_p(ptr
));
877 cpu_outw(port
, lduw_p(ptr
));
880 cpu_outl(port
, ldl_p(ptr
));
889 static int kvm_handle_internal_error(CPUState
*env
, struct kvm_run
*run
)
891 fprintf(stderr
, "KVM internal error.");
892 if (kvm_check_extension(kvm_state
, KVM_CAP_INTERNAL_ERROR_DATA
)) {
895 fprintf(stderr
, " Suberror: %d\n", run
->internal
.suberror
);
896 for (i
= 0; i
< run
->internal
.ndata
; ++i
) {
897 fprintf(stderr
, "extra data[%d]: %"PRIx64
"\n",
898 i
, (uint64_t)run
->internal
.data
[i
]);
901 fprintf(stderr
, "\n");
903 if (run
->internal
.suberror
== KVM_INTERNAL_ERROR_EMULATION
) {
904 fprintf(stderr
, "emulation failure\n");
905 if (!kvm_arch_stop_on_emulation_error(env
)) {
906 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
907 return EXCP_INTERRUPT
;
910 /* FIXME: Should trigger a qmp message to let management know
911 * something went wrong.
916 void kvm_flush_coalesced_mmio_buffer(void)
918 KVMState
*s
= kvm_state
;
920 if (s
->coalesced_flush_in_progress
) {
924 s
->coalesced_flush_in_progress
= true;
926 if (s
->coalesced_mmio_ring
) {
927 struct kvm_coalesced_mmio_ring
*ring
= s
->coalesced_mmio_ring
;
928 while (ring
->first
!= ring
->last
) {
929 struct kvm_coalesced_mmio
*ent
;
931 ent
= &ring
->coalesced_mmio
[ring
->first
];
933 cpu_physical_memory_write(ent
->phys_addr
, ent
->data
, ent
->len
);
935 ring
->first
= (ring
->first
+ 1) % KVM_COALESCED_MMIO_MAX
;
939 s
->coalesced_flush_in_progress
= false;
942 static void do_kvm_cpu_synchronize_state(void *_env
)
944 CPUState
*env
= _env
;
946 if (!env
->kvm_vcpu_dirty
) {
947 kvm_arch_get_registers(env
);
948 env
->kvm_vcpu_dirty
= 1;
952 void kvm_cpu_synchronize_state(CPUState
*env
)
954 if (!env
->kvm_vcpu_dirty
) {
955 run_on_cpu(env
, do_kvm_cpu_synchronize_state
, env
);
959 void kvm_cpu_synchronize_post_reset(CPUState
*env
)
961 kvm_arch_put_registers(env
, KVM_PUT_RESET_STATE
);
962 env
->kvm_vcpu_dirty
= 0;
965 void kvm_cpu_synchronize_post_init(CPUState
*env
)
967 kvm_arch_put_registers(env
, KVM_PUT_FULL_STATE
);
968 env
->kvm_vcpu_dirty
= 0;
971 int kvm_cpu_exec(CPUState
*env
)
973 struct kvm_run
*run
= env
->kvm_run
;
976 DPRINTF("kvm_cpu_exec()\n");
978 if (kvm_arch_process_async_events(env
)) {
979 env
->exit_request
= 0;
983 cpu_single_env
= env
;
986 if (env
->kvm_vcpu_dirty
) {
987 kvm_arch_put_registers(env
, KVM_PUT_RUNTIME_STATE
);
988 env
->kvm_vcpu_dirty
= 0;
991 kvm_arch_pre_run(env
, run
);
992 if (env
->exit_request
) {
993 DPRINTF("interrupt exit requested\n");
995 * KVM requires us to reenter the kernel after IO exits to complete
996 * instruction emulation. This self-signal will ensure that we
999 qemu_cpu_kick_self();
1001 cpu_single_env
= NULL
;
1002 qemu_mutex_unlock_iothread();
1004 run_ret
= kvm_vcpu_ioctl(env
, KVM_RUN
, 0);
1006 qemu_mutex_lock_iothread();
1007 cpu_single_env
= env
;
1008 kvm_arch_post_run(env
, run
);
1010 kvm_flush_coalesced_mmio_buffer();
1013 if (run_ret
== -EINTR
|| run_ret
== -EAGAIN
) {
1014 DPRINTF("io window exit\n");
1015 ret
= EXCP_INTERRUPT
;
1018 fprintf(stderr
, "error: kvm run failed %s\n",
1019 strerror(-run_ret
));
1023 switch (run
->exit_reason
) {
1025 DPRINTF("handle_io\n");
1026 kvm_handle_io(run
->io
.port
,
1027 (uint8_t *)run
+ run
->io
.data_offset
,
1034 DPRINTF("handle_mmio\n");
1035 cpu_physical_memory_rw(run
->mmio
.phys_addr
,
1038 run
->mmio
.is_write
);
1041 case KVM_EXIT_IRQ_WINDOW_OPEN
:
1042 DPRINTF("irq_window_open\n");
1043 ret
= EXCP_INTERRUPT
;
1045 case KVM_EXIT_SHUTDOWN
:
1046 DPRINTF("shutdown\n");
1047 qemu_system_reset_request();
1048 ret
= EXCP_INTERRUPT
;
1050 case KVM_EXIT_UNKNOWN
:
1051 fprintf(stderr
, "KVM: unknown exit, hardware reason %" PRIx64
"\n",
1052 (uint64_t)run
->hw
.hardware_exit_reason
);
1055 case KVM_EXIT_INTERNAL_ERROR
:
1056 ret
= kvm_handle_internal_error(env
, run
);
1059 DPRINTF("kvm_arch_handle_exit\n");
1060 ret
= kvm_arch_handle_exit(env
, run
);
1066 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
1067 vm_stop(RUN_STATE_INTERNAL_ERROR
);
1070 env
->exit_request
= 0;
1071 cpu_single_env
= NULL
;
1075 int kvm_ioctl(KVMState
*s
, int type
, ...)
1082 arg
= va_arg(ap
, void *);
1085 ret
= ioctl(s
->fd
, type
, arg
);
1092 int kvm_vm_ioctl(KVMState
*s
, int type
, ...)
1099 arg
= va_arg(ap
, void *);
1102 ret
= ioctl(s
->vmfd
, type
, arg
);
1109 int kvm_vcpu_ioctl(CPUState
*env
, int type
, ...)
1116 arg
= va_arg(ap
, void *);
1119 ret
= ioctl(env
->kvm_fd
, type
, arg
);
1126 int kvm_has_sync_mmu(void)
1128 return kvm_check_extension(kvm_state
, KVM_CAP_SYNC_MMU
);
1131 int kvm_has_vcpu_events(void)
1133 return kvm_state
->vcpu_events
;
1136 int kvm_has_robust_singlestep(void)
1138 return kvm_state
->robust_singlestep
;
1141 int kvm_has_debugregs(void)
1143 return kvm_state
->debugregs
;
1146 int kvm_has_xsave(void)
1148 return kvm_state
->xsave
;
1151 int kvm_has_xcrs(void)
1153 return kvm_state
->xcrs
;
1156 int kvm_has_many_ioeventfds(void)
1158 if (!kvm_enabled()) {
1161 return kvm_state
->many_ioeventfds
;
1164 void kvm_setup_guest_memory(void *start
, size_t size
)
1166 if (!kvm_has_sync_mmu()) {
1167 int ret
= qemu_madvise(start
, size
, QEMU_MADV_DONTFORK
);
1170 perror("qemu_madvise");
1172 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
1178 #ifdef KVM_CAP_SET_GUEST_DEBUG
1179 struct kvm_sw_breakpoint
*kvm_find_sw_breakpoint(CPUState
*env
,
1182 struct kvm_sw_breakpoint
*bp
;
1184 QTAILQ_FOREACH(bp
, &env
->kvm_state
->kvm_sw_breakpoints
, entry
) {
1192 int kvm_sw_breakpoints_active(CPUState
*env
)
1194 return !QTAILQ_EMPTY(&env
->kvm_state
->kvm_sw_breakpoints
);
1197 struct kvm_set_guest_debug_data
{
1198 struct kvm_guest_debug dbg
;
1203 static void kvm_invoke_set_guest_debug(void *data
)
1205 struct kvm_set_guest_debug_data
*dbg_data
= data
;
1206 CPUState
*env
= dbg_data
->env
;
1208 dbg_data
->err
= kvm_vcpu_ioctl(env
, KVM_SET_GUEST_DEBUG
, &dbg_data
->dbg
);
1211 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1213 struct kvm_set_guest_debug_data data
;
1215 data
.dbg
.control
= reinject_trap
;
1217 if (env
->singlestep_enabled
) {
1218 data
.dbg
.control
|= KVM_GUESTDBG_ENABLE
| KVM_GUESTDBG_SINGLESTEP
;
1220 kvm_arch_update_guest_debug(env
, &data
.dbg
);
1223 run_on_cpu(env
, kvm_invoke_set_guest_debug
, &data
);
1227 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1228 target_ulong len
, int type
)
1230 struct kvm_sw_breakpoint
*bp
;
1234 if (type
== GDB_BREAKPOINT_SW
) {
1235 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1241 bp
= g_malloc(sizeof(struct kvm_sw_breakpoint
));
1248 err
= kvm_arch_insert_sw_breakpoint(current_env
, bp
);
1254 QTAILQ_INSERT_HEAD(¤t_env
->kvm_state
->kvm_sw_breakpoints
,
1257 err
= kvm_arch_insert_hw_breakpoint(addr
, len
, type
);
1263 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1264 err
= kvm_update_guest_debug(env
, 0);
1272 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1273 target_ulong len
, int type
)
1275 struct kvm_sw_breakpoint
*bp
;
1279 if (type
== GDB_BREAKPOINT_SW
) {
1280 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1285 if (bp
->use_count
> 1) {
1290 err
= kvm_arch_remove_sw_breakpoint(current_env
, bp
);
1295 QTAILQ_REMOVE(¤t_env
->kvm_state
->kvm_sw_breakpoints
, bp
, entry
);
1298 err
= kvm_arch_remove_hw_breakpoint(addr
, len
, type
);
1304 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1305 err
= kvm_update_guest_debug(env
, 0);
1313 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1315 struct kvm_sw_breakpoint
*bp
, *next
;
1316 KVMState
*s
= current_env
->kvm_state
;
1319 QTAILQ_FOREACH_SAFE(bp
, &s
->kvm_sw_breakpoints
, entry
, next
) {
1320 if (kvm_arch_remove_sw_breakpoint(current_env
, bp
) != 0) {
1321 /* Try harder to find a CPU that currently sees the breakpoint. */
1322 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1323 if (kvm_arch_remove_sw_breakpoint(env
, bp
) == 0) {
1329 kvm_arch_remove_all_hw_breakpoints();
1331 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1332 kvm_update_guest_debug(env
, 0);
1336 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1338 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1343 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1344 target_ulong len
, int type
)
1349 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1350 target_ulong len
, int type
)
1355 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1358 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1360 int kvm_set_signal_mask(CPUState
*env
, const sigset_t
*sigset
)
1362 struct kvm_signal_mask
*sigmask
;
1366 return kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, NULL
);
1369 sigmask
= g_malloc(sizeof(*sigmask
) + sizeof(*sigset
));
1372 memcpy(sigmask
->sigset
, sigset
, sizeof(*sigset
));
1373 r
= kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, sigmask
);
1379 int kvm_set_ioeventfd_mmio_long(int fd
, uint32_t addr
, uint32_t val
, bool assign
)
1382 struct kvm_ioeventfd iofd
;
1384 iofd
.datamatch
= val
;
1387 iofd
.flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
;
1390 if (!kvm_enabled()) {
1395 iofd
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1398 ret
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &iofd
);
1407 int kvm_set_ioeventfd_pio_word(int fd
, uint16_t addr
, uint16_t val
, bool assign
)
1409 struct kvm_ioeventfd kick
= {
1413 .flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
| KVM_IOEVENTFD_FLAG_PIO
,
1417 if (!kvm_enabled()) {
1421 kick
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1423 r
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &kick
);
1430 int kvm_on_sigbus_vcpu(CPUState
*env
, int code
, void *addr
)
1432 return kvm_arch_on_sigbus_vcpu(env
, code
, addr
);
1435 int kvm_on_sigbus(int code
, void *addr
)
1437 return kvm_arch_on_sigbus(code
, addr
);