4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
32 /* Needed early for CONFIG_BSD etc. */
33 #include "config-host.h"
36 #include <sys/times.h>
40 #include <sys/ioctl.h>
41 #include <sys/resource.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
45 #if defined(__NetBSD__)
46 #include <net/if_tap.h>
49 #include <linux/if_tun.h>
51 #include <arpa/inet.h>
54 #include <sys/select.h>
57 #if defined(__FreeBSD__) || defined(__DragonFly__)
62 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
63 #include <freebsd/stdlib.h>
68 #include <linux/rtc.h>
76 #include <sys/timeb.h>
78 #define getopt_long_only getopt_long
79 #define memalign(align, size) malloc(size)
82 #include "qemu-common.h"
87 #include "qemu-timer.h"
88 #include "qemu-char.h"
90 #include "audio/audio.h"
91 #include "migration.h"
92 #include "qemu_socket.h"
94 /* point to the block driver where the snapshots are managed */
95 static BlockDriverState
*bs_snapshots
;
97 #define SELF_ANNOUNCE_ROUNDS 5
98 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
99 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
100 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
102 static int announce_self_create(uint8_t *buf
,
105 uint32_t magic
= EXPERIMENTAL_MAGIC
;
106 uint16_t proto
= htons(ETH_P_EXPERIMENTAL
);
108 /* FIXME: should we send a different packet (arp/rarp/ping)? */
111 memset(buf
, 0xff, 6); /* h_dst */
112 memcpy(buf
+ 6, mac_addr
, 6); /* h_src */
113 memcpy(buf
+ 12, &proto
, 2); /* h_proto */
114 memcpy(buf
+ 14, &magic
, 4); /* magic */
119 static void qemu_announce_self_once(void *opaque
)
125 static int count
= SELF_ANNOUNCE_ROUNDS
;
126 QEMUTimer
*timer
= *(QEMUTimer
**)opaque
;
128 for (i
= 0; i
< MAX_NICS
; i
++) {
129 if (!nd_table
[i
].used
)
131 len
= announce_self_create(buf
, nd_table
[i
].macaddr
);
132 vlan
= nd_table
[i
].vlan
;
133 for(vc
= vlan
->first_client
; vc
!= NULL
; vc
= vc
->next
) {
134 vc
->receive(vc
, buf
, len
);
138 qemu_mod_timer(timer
, qemu_get_clock(rt_clock
) + 100);
140 qemu_del_timer(timer
);
141 qemu_free_timer(timer
);
145 void qemu_announce_self(void)
147 static QEMUTimer
*timer
;
148 timer
= qemu_new_timer(rt_clock
, qemu_announce_self_once
, &timer
);
149 qemu_announce_self_once(&timer
);
152 /***********************************************************/
153 /* savevm/loadvm support */
155 #define IO_BUF_SIZE 32768
158 QEMUFilePutBufferFunc
*put_buffer
;
159 QEMUFileGetBufferFunc
*get_buffer
;
160 QEMUFileCloseFunc
*close
;
161 QEMUFileRateLimit
*rate_limit
;
162 QEMUFileSetRateLimit
*set_rate_limit
;
166 int64_t buf_offset
; /* start of buffer when writing, end of buffer
169 int buf_size
; /* 0 when writing */
170 uint8_t buf
[IO_BUF_SIZE
];
175 typedef struct QEMUFileStdio
181 typedef struct QEMUFileSocket
187 static int socket_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
189 QEMUFileSocket
*s
= opaque
;
193 len
= recv(s
->fd
, (void *)buf
, size
, 0);
194 } while (len
== -1 && socket_error() == EINTR
);
197 len
= -socket_error();
202 static int socket_close(void *opaque
)
204 QEMUFileSocket
*s
= opaque
;
209 static int stdio_put_buffer(void *opaque
, const uint8_t *buf
, int64_t pos
, int size
)
211 QEMUFileStdio
*s
= opaque
;
212 return fwrite(buf
, 1, size
, s
->stdio_file
);
215 static int stdio_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
217 QEMUFileStdio
*s
= opaque
;
218 FILE *fp
= s
->stdio_file
;
223 bytes
= fread(buf
, 1, size
, fp
);
224 } while ((bytes
== 0) && ferror(fp
) && (errno
== EINTR
));
228 static int stdio_pclose(void *opaque
)
230 QEMUFileStdio
*s
= opaque
;
231 pclose(s
->stdio_file
);
236 static int stdio_fclose(void *opaque
)
238 QEMUFileStdio
*s
= opaque
;
239 fclose(s
->stdio_file
);
244 QEMUFile
*qemu_popen(FILE *stdio_file
, const char *mode
)
248 if (stdio_file
== NULL
|| mode
== NULL
|| (mode
[0] != 'r' && mode
[0] != 'w') || mode
[1] != 0) {
249 fprintf(stderr
, "qemu_popen: Argument validity check failed\n");
253 s
= qemu_mallocz(sizeof(QEMUFileStdio
));
255 s
->stdio_file
= stdio_file
;
258 s
->file
= qemu_fopen_ops(s
, NULL
, stdio_get_buffer
, stdio_pclose
, NULL
, NULL
);
260 s
->file
= qemu_fopen_ops(s
, stdio_put_buffer
, NULL
, stdio_pclose
, NULL
, NULL
);
265 QEMUFile
*qemu_popen_cmd(const char *command
, const char *mode
)
269 popen_file
= popen(command
, mode
);
270 if(popen_file
== NULL
) {
274 return qemu_popen(popen_file
, mode
);
277 int qemu_stdio_fd(QEMUFile
*f
)
282 p
= (QEMUFileStdio
*)f
->opaque
;
283 fd
= fileno(p
->stdio_file
);
288 QEMUFile
*qemu_fdopen(int fd
, const char *mode
)
293 (mode
[0] != 'r' && mode
[0] != 'w') ||
294 mode
[1] != 'b' || mode
[2] != 0) {
295 fprintf(stderr
, "qemu_fdopen: Argument validity check failed\n");
299 s
= qemu_mallocz(sizeof(QEMUFileStdio
));
300 s
->stdio_file
= fdopen(fd
, mode
);
305 s
->file
= qemu_fopen_ops(s
, NULL
, stdio_get_buffer
, stdio_fclose
, NULL
, NULL
);
307 s
->file
= qemu_fopen_ops(s
, stdio_put_buffer
, NULL
, stdio_fclose
, NULL
, NULL
);
316 QEMUFile
*qemu_fopen_socket(int fd
)
318 QEMUFileSocket
*s
= qemu_mallocz(sizeof(QEMUFileSocket
));
321 s
->file
= qemu_fopen_ops(s
, NULL
, socket_get_buffer
, socket_close
, NULL
, NULL
);
325 static int file_put_buffer(void *opaque
, const uint8_t *buf
,
326 int64_t pos
, int size
)
328 QEMUFileStdio
*s
= opaque
;
329 fseek(s
->stdio_file
, pos
, SEEK_SET
);
330 fwrite(buf
, 1, size
, s
->stdio_file
);
334 static int file_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
336 QEMUFileStdio
*s
= opaque
;
337 fseek(s
->stdio_file
, pos
, SEEK_SET
);
338 return fread(buf
, 1, size
, s
->stdio_file
);
341 QEMUFile
*qemu_fopen(const char *filename
, const char *mode
)
346 (mode
[0] != 'r' && mode
[0] != 'w') ||
347 mode
[1] != 'b' || mode
[2] != 0) {
348 fprintf(stderr
, "qemu_fdopen: Argument validity check failed\n");
352 s
= qemu_mallocz(sizeof(QEMUFileStdio
));
354 s
->stdio_file
= fopen(filename
, mode
);
359 s
->file
= qemu_fopen_ops(s
, file_put_buffer
, NULL
, stdio_fclose
, NULL
, NULL
);
361 s
->file
= qemu_fopen_ops(s
, NULL
, file_get_buffer
, stdio_fclose
, NULL
, NULL
);
369 static int block_put_buffer(void *opaque
, const uint8_t *buf
,
370 int64_t pos
, int size
)
372 bdrv_save_vmstate(opaque
, buf
, pos
, size
);
376 static int block_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
378 return bdrv_load_vmstate(opaque
, buf
, pos
, size
);
381 static int bdrv_fclose(void *opaque
)
386 static QEMUFile
*qemu_fopen_bdrv(BlockDriverState
*bs
, int is_writable
)
389 return qemu_fopen_ops(bs
, block_put_buffer
, NULL
, bdrv_fclose
, NULL
, NULL
);
390 return qemu_fopen_ops(bs
, NULL
, block_get_buffer
, bdrv_fclose
, NULL
, NULL
);
393 QEMUFile
*qemu_fopen_ops(void *opaque
, QEMUFilePutBufferFunc
*put_buffer
,
394 QEMUFileGetBufferFunc
*get_buffer
,
395 QEMUFileCloseFunc
*close
,
396 QEMUFileRateLimit
*rate_limit
,
397 QEMUFileSetRateLimit
*set_rate_limit
)
401 f
= qemu_mallocz(sizeof(QEMUFile
));
404 f
->put_buffer
= put_buffer
;
405 f
->get_buffer
= get_buffer
;
407 f
->rate_limit
= rate_limit
;
408 f
->set_rate_limit
= set_rate_limit
;
414 int qemu_file_has_error(QEMUFile
*f
)
419 void qemu_file_set_error(QEMUFile
*f
)
424 void qemu_fflush(QEMUFile
*f
)
429 if (f
->is_write
&& f
->buf_index
> 0) {
432 len
= f
->put_buffer(f
->opaque
, f
->buf
, f
->buf_offset
, f
->buf_index
);
434 f
->buf_offset
+= f
->buf_index
;
441 static void qemu_fill_buffer(QEMUFile
*f
)
451 len
= f
->get_buffer(f
->opaque
, f
->buf
, f
->buf_offset
, IO_BUF_SIZE
);
455 f
->buf_offset
+= len
;
456 } else if (len
!= -EAGAIN
)
460 int qemu_fclose(QEMUFile
*f
)
465 ret
= f
->close(f
->opaque
);
470 void qemu_file_put_notify(QEMUFile
*f
)
472 f
->put_buffer(f
->opaque
, NULL
, 0, 0);
475 void qemu_put_buffer(QEMUFile
*f
, const uint8_t *buf
, int size
)
479 if (!f
->has_error
&& f
->is_write
== 0 && f
->buf_index
> 0) {
481 "Attempted to write to buffer while read buffer is not empty\n");
485 while (!f
->has_error
&& size
> 0) {
486 l
= IO_BUF_SIZE
- f
->buf_index
;
489 memcpy(f
->buf
+ f
->buf_index
, buf
, l
);
494 if (f
->buf_index
>= IO_BUF_SIZE
)
499 void qemu_put_byte(QEMUFile
*f
, int v
)
501 if (!f
->has_error
&& f
->is_write
== 0 && f
->buf_index
> 0) {
503 "Attempted to write to buffer while read buffer is not empty\n");
507 f
->buf
[f
->buf_index
++] = v
;
509 if (f
->buf_index
>= IO_BUF_SIZE
)
513 int qemu_get_buffer(QEMUFile
*f
, uint8_t *buf
, int size1
)
522 l
= f
->buf_size
- f
->buf_index
;
525 l
= f
->buf_size
- f
->buf_index
;
531 memcpy(buf
, f
->buf
+ f
->buf_index
, l
);
539 int qemu_get_byte(QEMUFile
*f
)
544 if (f
->buf_index
>= f
->buf_size
) {
546 if (f
->buf_index
>= f
->buf_size
)
549 return f
->buf
[f
->buf_index
++];
552 int64_t qemu_ftell(QEMUFile
*f
)
554 return f
->buf_offset
- f
->buf_size
+ f
->buf_index
;
557 int64_t qemu_fseek(QEMUFile
*f
, int64_t pos
, int whence
)
559 if (whence
== SEEK_SET
) {
561 } else if (whence
== SEEK_CUR
) {
562 pos
+= qemu_ftell(f
);
564 /* SEEK_END not supported */
578 int qemu_file_rate_limit(QEMUFile
*f
)
581 return f
->rate_limit(f
->opaque
);
586 size_t qemu_file_set_rate_limit(QEMUFile
*f
, size_t new_rate
)
588 /* any failed or completed migration keeps its state to allow probing of
589 * migration data, but has no associated file anymore */
590 if (f
&& f
->set_rate_limit
)
591 return f
->set_rate_limit(f
->opaque
, new_rate
);
596 void qemu_put_be16(QEMUFile
*f
, unsigned int v
)
598 qemu_put_byte(f
, v
>> 8);
602 void qemu_put_be32(QEMUFile
*f
, unsigned int v
)
604 qemu_put_byte(f
, v
>> 24);
605 qemu_put_byte(f
, v
>> 16);
606 qemu_put_byte(f
, v
>> 8);
610 void qemu_put_be64(QEMUFile
*f
, uint64_t v
)
612 qemu_put_be32(f
, v
>> 32);
616 unsigned int qemu_get_be16(QEMUFile
*f
)
619 v
= qemu_get_byte(f
) << 8;
620 v
|= qemu_get_byte(f
);
624 unsigned int qemu_get_be32(QEMUFile
*f
)
627 v
= qemu_get_byte(f
) << 24;
628 v
|= qemu_get_byte(f
) << 16;
629 v
|= qemu_get_byte(f
) << 8;
630 v
|= qemu_get_byte(f
);
634 uint64_t qemu_get_be64(QEMUFile
*f
)
637 v
= (uint64_t)qemu_get_be32(f
) << 32;
638 v
|= qemu_get_be32(f
);
642 typedef struct SaveStateEntry
{
647 SaveLiveStateHandler
*save_live_state
;
648 SaveStateHandler
*save_state
;
649 LoadStateHandler
*load_state
;
651 struct SaveStateEntry
*next
;
654 static SaveStateEntry
*first_se
;
656 /* TODO: Individual devices generally have very little idea about the rest
657 of the system, so instance_id should be removed/replaced.
658 Meanwhile pass -1 as instance_id if you do not already have a clearly
659 distinguishing id for all instances of your device class. */
660 int register_savevm_live(const char *idstr
,
663 SaveLiveStateHandler
*save_live_state
,
664 SaveStateHandler
*save_state
,
665 LoadStateHandler
*load_state
,
668 SaveStateEntry
*se
, **pse
;
669 static int global_section_id
;
671 se
= qemu_malloc(sizeof(SaveStateEntry
));
672 pstrcpy(se
->idstr
, sizeof(se
->idstr
), idstr
);
673 se
->instance_id
= (instance_id
== -1) ? 0 : instance_id
;
674 se
->version_id
= version_id
;
675 se
->section_id
= global_section_id
++;
676 se
->save_live_state
= save_live_state
;
677 se
->save_state
= save_state
;
678 se
->load_state
= load_state
;
682 /* add at the end of list */
684 while (*pse
!= NULL
) {
685 if (instance_id
== -1
686 && strcmp(se
->idstr
, (*pse
)->idstr
) == 0
687 && se
->instance_id
<= (*pse
)->instance_id
)
688 se
->instance_id
= (*pse
)->instance_id
+ 1;
695 int register_savevm(const char *idstr
,
698 SaveStateHandler
*save_state
,
699 LoadStateHandler
*load_state
,
702 return register_savevm_live(idstr
, instance_id
, version_id
,
703 NULL
, save_state
, load_state
, opaque
);
706 void unregister_savevm(const char *idstr
, void *opaque
)
708 SaveStateEntry
**pse
;
711 while (*pse
!= NULL
) {
712 if (strcmp((*pse
)->idstr
, idstr
) == 0 && (*pse
)->opaque
== opaque
) {
713 SaveStateEntry
*next
= (*pse
)->next
;
722 #define QEMU_VM_FILE_MAGIC 0x5145564d
723 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
724 #define QEMU_VM_FILE_VERSION 0x00000003
726 #define QEMU_VM_EOF 0x00
727 #define QEMU_VM_SECTION_START 0x01
728 #define QEMU_VM_SECTION_PART 0x02
729 #define QEMU_VM_SECTION_END 0x03
730 #define QEMU_VM_SECTION_FULL 0x04
732 int qemu_savevm_state_begin(QEMUFile
*f
)
736 qemu_put_be32(f
, QEMU_VM_FILE_MAGIC
);
737 qemu_put_be32(f
, QEMU_VM_FILE_VERSION
);
739 for (se
= first_se
; se
!= NULL
; se
= se
->next
) {
742 if (se
->save_live_state
== NULL
)
746 qemu_put_byte(f
, QEMU_VM_SECTION_START
);
747 qemu_put_be32(f
, se
->section_id
);
750 len
= strlen(se
->idstr
);
751 qemu_put_byte(f
, len
);
752 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
754 qemu_put_be32(f
, se
->instance_id
);
755 qemu_put_be32(f
, se
->version_id
);
757 se
->save_live_state(f
, QEMU_VM_SECTION_START
, se
->opaque
);
760 if (qemu_file_has_error(f
))
766 int qemu_savevm_state_iterate(QEMUFile
*f
)
771 for (se
= first_se
; se
!= NULL
; se
= se
->next
) {
772 if (se
->save_live_state
== NULL
)
776 qemu_put_byte(f
, QEMU_VM_SECTION_PART
);
777 qemu_put_be32(f
, se
->section_id
);
779 ret
&= !!se
->save_live_state(f
, QEMU_VM_SECTION_PART
, se
->opaque
);
785 if (qemu_file_has_error(f
))
791 int qemu_savevm_state_complete(QEMUFile
*f
)
795 for (se
= first_se
; se
!= NULL
; se
= se
->next
) {
796 if (se
->save_live_state
== NULL
)
800 qemu_put_byte(f
, QEMU_VM_SECTION_END
);
801 qemu_put_be32(f
, se
->section_id
);
803 se
->save_live_state(f
, QEMU_VM_SECTION_END
, se
->opaque
);
806 for(se
= first_se
; se
!= NULL
; se
= se
->next
) {
809 if (se
->save_state
== NULL
)
813 qemu_put_byte(f
, QEMU_VM_SECTION_FULL
);
814 qemu_put_be32(f
, se
->section_id
);
817 len
= strlen(se
->idstr
);
818 qemu_put_byte(f
, len
);
819 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
821 qemu_put_be32(f
, se
->instance_id
);
822 qemu_put_be32(f
, se
->version_id
);
824 se
->save_state(f
, se
->opaque
);
827 qemu_put_byte(f
, QEMU_VM_EOF
);
829 if (qemu_file_has_error(f
))
835 int qemu_savevm_state(QEMUFile
*f
)
837 int saved_vm_running
;
840 saved_vm_running
= vm_running
;
845 ret
= qemu_savevm_state_begin(f
);
850 ret
= qemu_savevm_state_iterate(f
);
855 ret
= qemu_savevm_state_complete(f
);
858 if (qemu_file_has_error(f
))
861 if (!ret
&& saved_vm_running
)
867 static SaveStateEntry
*find_se(const char *idstr
, int instance_id
)
871 for(se
= first_se
; se
!= NULL
; se
= se
->next
) {
872 if (!strcmp(se
->idstr
, idstr
) &&
873 instance_id
== se
->instance_id
)
879 typedef struct LoadStateEntry
{
883 struct LoadStateEntry
*next
;
886 static int qemu_loadvm_state_v2(QEMUFile
*f
)
889 int len
, ret
, instance_id
, record_len
, version_id
;
890 int64_t total_len
, end_pos
, cur_pos
;
893 total_len
= qemu_get_be64(f
);
894 end_pos
= total_len
+ qemu_ftell(f
);
896 if (qemu_ftell(f
) >= end_pos
)
898 len
= qemu_get_byte(f
);
899 qemu_get_buffer(f
, (uint8_t *)idstr
, len
);
901 instance_id
= qemu_get_be32(f
);
902 version_id
= qemu_get_be32(f
);
903 record_len
= qemu_get_be32(f
);
904 cur_pos
= qemu_ftell(f
);
905 se
= find_se(idstr
, instance_id
);
907 fprintf(stderr
, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n",
910 ret
= se
->load_state(f
, se
->opaque
, version_id
);
912 fprintf(stderr
, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
917 /* always seek to exact end of record */
918 qemu_fseek(f
, cur_pos
+ record_len
, SEEK_SET
);
921 if (qemu_file_has_error(f
))
927 int qemu_loadvm_state(QEMUFile
*f
)
929 LoadStateEntry
*first_le
= NULL
;
930 uint8_t section_type
;
934 v
= qemu_get_be32(f
);
935 if (v
!= QEMU_VM_FILE_MAGIC
)
938 v
= qemu_get_be32(f
);
939 if (v
== QEMU_VM_FILE_VERSION_COMPAT
)
940 return qemu_loadvm_state_v2(f
);
941 if (v
!= QEMU_VM_FILE_VERSION
)
944 while ((section_type
= qemu_get_byte(f
)) != QEMU_VM_EOF
) {
945 uint32_t instance_id
, version_id
, section_id
;
951 switch (section_type
) {
952 case QEMU_VM_SECTION_START
:
953 case QEMU_VM_SECTION_FULL
:
954 /* Read section start */
955 section_id
= qemu_get_be32(f
);
956 len
= qemu_get_byte(f
);
957 qemu_get_buffer(f
, (uint8_t *)idstr
, len
);
959 instance_id
= qemu_get_be32(f
);
960 version_id
= qemu_get_be32(f
);
962 /* Find savevm section */
963 se
= find_se(idstr
, instance_id
);
965 fprintf(stderr
, "Unknown savevm section or instance '%s' %d\n", idstr
, instance_id
);
970 /* Validate version */
971 if (version_id
> se
->version_id
) {
972 fprintf(stderr
, "savevm: unsupported version %d for '%s' v%d\n",
973 version_id
, idstr
, se
->version_id
);
979 le
= qemu_mallocz(sizeof(*le
));
982 le
->section_id
= section_id
;
983 le
->version_id
= version_id
;
987 le
->se
->load_state(f
, le
->se
->opaque
, le
->version_id
);
989 case QEMU_VM_SECTION_PART
:
990 case QEMU_VM_SECTION_END
:
991 section_id
= qemu_get_be32(f
);
993 for (le
= first_le
; le
&& le
->section_id
!= section_id
; le
= le
->next
);
995 fprintf(stderr
, "Unknown savevm section %d\n", section_id
);
1000 le
->se
->load_state(f
, le
->se
->opaque
, le
->version_id
);
1003 fprintf(stderr
, "Unknown savevm section type %d\n", section_type
);
1013 LoadStateEntry
*le
= first_le
;
1014 first_le
= first_le
->next
;
1018 if (qemu_file_has_error(f
))
1024 /* device can contain snapshots */
1025 static int bdrv_can_snapshot(BlockDriverState
*bs
)
1028 !bdrv_is_removable(bs
) &&
1029 !bdrv_is_read_only(bs
));
1032 /* device must be snapshots in order to have a reliable snapshot */
1033 static int bdrv_has_snapshot(BlockDriverState
*bs
)
1036 !bdrv_is_removable(bs
) &&
1037 !bdrv_is_read_only(bs
));
1040 static BlockDriverState
*get_bs_snapshots(void)
1042 BlockDriverState
*bs
;
1046 return bs_snapshots
;
1047 TAILQ_FOREACH(dinfo
, &drives
, next
) {
1049 if (bdrv_can_snapshot(bs
))
1058 static int bdrv_snapshot_find(BlockDriverState
*bs
, QEMUSnapshotInfo
*sn_info
,
1061 QEMUSnapshotInfo
*sn_tab
, *sn
;
1065 nb_sns
= bdrv_snapshot_list(bs
, &sn_tab
);
1068 for(i
= 0; i
< nb_sns
; i
++) {
1070 if (!strcmp(sn
->id_str
, name
) || !strcmp(sn
->name
, name
)) {
1080 void do_savevm(Monitor
*mon
, const char *name
)
1083 BlockDriverState
*bs
, *bs1
;
1084 QEMUSnapshotInfo sn1
, *sn
= &sn1
, old_sn1
, *old_sn
= &old_sn1
;
1085 int must_delete
, ret
;
1087 int saved_vm_running
;
1088 uint32_t vm_state_size
;
1095 bs
= get_bs_snapshots();
1097 monitor_printf(mon
, "No block device can accept snapshots\n");
1101 /* ??? Should this occur after vm_stop? */
1104 saved_vm_running
= vm_running
;
1109 ret
= bdrv_snapshot_find(bs
, old_sn
, name
);
1114 memset(sn
, 0, sizeof(*sn
));
1116 pstrcpy(sn
->name
, sizeof(sn
->name
), old_sn
->name
);
1117 pstrcpy(sn
->id_str
, sizeof(sn
->id_str
), old_sn
->id_str
);
1120 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
1123 /* fill auxiliary fields */
1126 sn
->date_sec
= tb
.time
;
1127 sn
->date_nsec
= tb
.millitm
* 1000000;
1129 gettimeofday(&tv
, NULL
);
1130 sn
->date_sec
= tv
.tv_sec
;
1131 sn
->date_nsec
= tv
.tv_usec
* 1000;
1133 sn
->vm_clock_nsec
= qemu_get_clock(vm_clock
);
1135 /* save the VM state */
1136 f
= qemu_fopen_bdrv(bs
, 1);
1138 monitor_printf(mon
, "Could not open VM state file\n");
1141 ret
= qemu_savevm_state(f
);
1142 vm_state_size
= qemu_ftell(f
);
1145 monitor_printf(mon
, "Error %d while writing VM\n", ret
);
1149 /* create the snapshots */
1151 TAILQ_FOREACH(dinfo
, &drives
, next
) {
1153 if (bdrv_has_snapshot(bs1
)) {
1155 ret
= bdrv_snapshot_delete(bs1
, old_sn
->id_str
);
1158 "Error while deleting snapshot on '%s'\n",
1159 bdrv_get_device_name(bs1
));
1162 /* Write VM state size only to the image that contains the state */
1163 sn
->vm_state_size
= (bs
== bs1
? vm_state_size
: 0);
1164 ret
= bdrv_snapshot_create(bs1
, sn
);
1166 monitor_printf(mon
, "Error while creating snapshot on '%s'\n",
1167 bdrv_get_device_name(bs1
));
1173 if (saved_vm_running
)
1177 void do_loadvm(Monitor
*mon
, const char *name
)
1180 BlockDriverState
*bs
, *bs1
;
1181 QEMUSnapshotInfo sn
;
1184 int saved_vm_running
;
1186 bs
= get_bs_snapshots();
1188 monitor_printf(mon
, "No block device supports snapshots\n");
1192 /* Flush all IO requests so they don't interfere with the new state. */
1195 saved_vm_running
= vm_running
;
1198 TAILQ_FOREACH(dinfo
, &drives
, next
) {
1200 if (bdrv_has_snapshot(bs1
)) {
1201 ret
= bdrv_snapshot_goto(bs1
, name
);
1204 monitor_printf(mon
, "Warning: ");
1208 "Snapshots not supported on device '%s'\n",
1209 bdrv_get_device_name(bs1
));
1212 monitor_printf(mon
, "Could not find snapshot '%s' on "
1214 name
, bdrv_get_device_name(bs1
));
1217 monitor_printf(mon
, "Error %d while activating snapshot on"
1218 " '%s'\n", ret
, bdrv_get_device_name(bs1
));
1221 /* fatal on snapshot block device */
1228 /* Don't even try to load empty VM states */
1229 ret
= bdrv_snapshot_find(bs
, &sn
, name
);
1230 if ((ret
>= 0) && (sn
.vm_state_size
== 0))
1233 /* restore the VM state */
1234 f
= qemu_fopen_bdrv(bs
, 0);
1236 monitor_printf(mon
, "Could not open VM state file\n");
1239 ret
= qemu_loadvm_state(f
);
1242 monitor_printf(mon
, "Error %d while loading VM state\n", ret
);
1245 if (saved_vm_running
)
1249 void do_delvm(Monitor
*mon
, const char *name
)
1252 BlockDriverState
*bs
, *bs1
;
1255 bs
= get_bs_snapshots();
1257 monitor_printf(mon
, "No block device supports snapshots\n");
1261 TAILQ_FOREACH(dinfo
, &drives
, next
) {
1263 if (bdrv_has_snapshot(bs1
)) {
1264 ret
= bdrv_snapshot_delete(bs1
, name
);
1266 if (ret
== -ENOTSUP
)
1268 "Snapshots not supported on device '%s'\n",
1269 bdrv_get_device_name(bs1
));
1271 monitor_printf(mon
, "Error %d while deleting snapshot on "
1272 "'%s'\n", ret
, bdrv_get_device_name(bs1
));
1278 void do_info_snapshots(Monitor
*mon
)
1281 BlockDriverState
*bs
, *bs1
;
1282 QEMUSnapshotInfo
*sn_tab
, *sn
;
1286 bs
= get_bs_snapshots();
1288 monitor_printf(mon
, "No available block device supports snapshots\n");
1291 monitor_printf(mon
, "Snapshot devices:");
1292 TAILQ_FOREACH(dinfo
, &drives
, next
) {
1294 if (bdrv_has_snapshot(bs1
)) {
1296 monitor_printf(mon
, " %s", bdrv_get_device_name(bs1
));
1299 monitor_printf(mon
, "\n");
1301 nb_sns
= bdrv_snapshot_list(bs
, &sn_tab
);
1303 monitor_printf(mon
, "bdrv_snapshot_list: error %d\n", nb_sns
);
1306 monitor_printf(mon
, "Snapshot list (from %s):\n",
1307 bdrv_get_device_name(bs
));
1308 monitor_printf(mon
, "%s\n", bdrv_snapshot_dump(buf
, sizeof(buf
), NULL
));
1309 for(i
= 0; i
< nb_sns
; i
++) {
1311 monitor_printf(mon
, "%s\n", bdrv_snapshot_dump(buf
, sizeof(buf
), sn
));