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
31 /* Needed early for CONFIG_BSD etc. */
32 #include "config-host.h"
35 #include <sys/times.h>
39 #include <sys/ioctl.h>
40 #include <sys/resource.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
44 #include <arpa/inet.h>
47 #include <sys/select.h>
50 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
58 #include <linux/rtc.h>
66 #include <sys/timeb.h>
68 #define getopt_long_only getopt_long
69 #define memalign(align, size) malloc(size)
72 #include "qemu-common.h"
78 #include "qemu-timer.h"
79 #include "qemu-char.h"
80 #include "audio/audio.h"
81 #include "migration.h"
82 #include "qemu_socket.h"
83 #include "qemu-queue.h"
84 #include "qemu-timer.h"
87 #include "qmp-commands.h"
90 #define SELF_ANNOUNCE_ROUNDS 5
93 #define ETH_P_RARP 0x8035
95 #define ARP_HTYPE_ETH 0x0001
96 #define ARP_PTYPE_IP 0x0800
97 #define ARP_OP_REQUEST_REV 0x3
99 static int announce_self_create(uint8_t *buf
,
102 /* Ethernet header. */
103 memset(buf
, 0xff, 6); /* destination MAC addr */
104 memcpy(buf
+ 6, mac_addr
, 6); /* source MAC addr */
105 *(uint16_t *)(buf
+ 12) = htons(ETH_P_RARP
); /* ethertype */
108 *(uint16_t *)(buf
+ 14) = htons(ARP_HTYPE_ETH
); /* hardware addr space */
109 *(uint16_t *)(buf
+ 16) = htons(ARP_PTYPE_IP
); /* protocol addr space */
110 *(buf
+ 18) = 6; /* hardware addr length (ethernet) */
111 *(buf
+ 19) = 4; /* protocol addr length (IPv4) */
112 *(uint16_t *)(buf
+ 20) = htons(ARP_OP_REQUEST_REV
); /* opcode */
113 memcpy(buf
+ 22, mac_addr
, 6); /* source hw addr */
114 memset(buf
+ 28, 0x00, 4); /* source protocol addr */
115 memcpy(buf
+ 32, mac_addr
, 6); /* target hw addr */
116 memset(buf
+ 38, 0x00, 4); /* target protocol addr */
118 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
119 memset(buf
+ 42, 0x00, 18);
121 return 60; /* len (FCS will be added by hardware) */
124 static void qemu_announce_self_iter(NICState
*nic
, void *opaque
)
129 len
= announce_self_create(buf
, nic
->conf
->macaddr
.a
);
131 qemu_send_packet_raw(&nic
->nc
, buf
, len
);
135 static void qemu_announce_self_once(void *opaque
)
137 static int count
= SELF_ANNOUNCE_ROUNDS
;
138 QEMUTimer
*timer
= *(QEMUTimer
**)opaque
;
140 qemu_foreach_nic(qemu_announce_self_iter
, NULL
);
143 /* delay 50ms, 150ms, 250ms, ... */
144 qemu_mod_timer(timer
, qemu_get_clock_ms(rt_clock
) +
145 50 + (SELF_ANNOUNCE_ROUNDS
- count
- 1) * 100);
147 qemu_del_timer(timer
);
148 qemu_free_timer(timer
);
152 void qemu_announce_self(void)
154 static QEMUTimer
*timer
;
155 timer
= qemu_new_timer_ms(rt_clock
, qemu_announce_self_once
, &timer
);
156 qemu_announce_self_once(&timer
);
159 /***********************************************************/
160 /* savevm/loadvm support */
162 #define IO_BUF_SIZE 32768
165 QEMUFilePutBufferFunc
*put_buffer
;
166 QEMUFileGetBufferFunc
*get_buffer
;
167 QEMUFileCloseFunc
*close
;
168 QEMUFileRateLimit
*rate_limit
;
169 QEMUFileSetRateLimit
*set_rate_limit
;
170 QEMUFileGetRateLimit
*get_rate_limit
;
174 int64_t buf_offset
; /* start of buffer when writing, end of buffer
177 int buf_size
; /* 0 when writing */
178 uint8_t buf
[IO_BUF_SIZE
];
183 typedef struct QEMUFileStdio
189 typedef struct QEMUFileSocket
195 static int socket_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
197 QEMUFileSocket
*s
= opaque
;
201 len
= qemu_recv(s
->fd
, buf
, size
, 0);
202 } while (len
== -1 && socket_error() == EINTR
);
205 len
= -socket_error();
210 static int socket_close(void *opaque
)
212 QEMUFileSocket
*s
= opaque
;
217 static int stdio_put_buffer(void *opaque
, const uint8_t *buf
, int64_t pos
, int size
)
219 QEMUFileStdio
*s
= opaque
;
220 return fwrite(buf
, 1, size
, s
->stdio_file
);
223 static int stdio_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
225 QEMUFileStdio
*s
= opaque
;
226 FILE *fp
= s
->stdio_file
;
231 bytes
= fread(buf
, 1, size
, fp
);
232 } while ((bytes
== 0) && ferror(fp
) && (errno
== EINTR
));
236 static int stdio_pclose(void *opaque
)
238 QEMUFileStdio
*s
= opaque
;
240 ret
= pclose(s
->stdio_file
);
248 static int stdio_fclose(void *opaque
)
250 QEMUFileStdio
*s
= opaque
;
252 if (fclose(s
->stdio_file
) == EOF
) {
259 QEMUFile
*qemu_popen(FILE *stdio_file
, const char *mode
)
263 if (stdio_file
== NULL
|| mode
== NULL
|| (mode
[0] != 'r' && mode
[0] != 'w') || mode
[1] != 0) {
264 fprintf(stderr
, "qemu_popen: Argument validity check failed\n");
268 s
= g_malloc0(sizeof(QEMUFileStdio
));
270 s
->stdio_file
= stdio_file
;
273 s
->file
= qemu_fopen_ops(s
, NULL
, stdio_get_buffer
, stdio_pclose
,
276 s
->file
= qemu_fopen_ops(s
, stdio_put_buffer
, NULL
, stdio_pclose
,
282 QEMUFile
*qemu_popen_cmd(const char *command
, const char *mode
)
286 popen_file
= popen(command
, mode
);
287 if(popen_file
== NULL
) {
291 return qemu_popen(popen_file
, mode
);
294 int qemu_stdio_fd(QEMUFile
*f
)
299 p
= (QEMUFileStdio
*)f
->opaque
;
300 fd
= fileno(p
->stdio_file
);
305 QEMUFile
*qemu_fdopen(int fd
, const char *mode
)
310 (mode
[0] != 'r' && mode
[0] != 'w') ||
311 mode
[1] != 'b' || mode
[2] != 0) {
312 fprintf(stderr
, "qemu_fdopen: Argument validity check failed\n");
316 s
= g_malloc0(sizeof(QEMUFileStdio
));
317 s
->stdio_file
= fdopen(fd
, mode
);
322 s
->file
= qemu_fopen_ops(s
, NULL
, stdio_get_buffer
, stdio_fclose
,
325 s
->file
= qemu_fopen_ops(s
, stdio_put_buffer
, NULL
, stdio_fclose
,
335 QEMUFile
*qemu_fopen_socket(int fd
)
337 QEMUFileSocket
*s
= g_malloc0(sizeof(QEMUFileSocket
));
340 s
->file
= qemu_fopen_ops(s
, NULL
, socket_get_buffer
, socket_close
,
345 static int file_put_buffer(void *opaque
, const uint8_t *buf
,
346 int64_t pos
, int size
)
348 QEMUFileStdio
*s
= opaque
;
349 fseek(s
->stdio_file
, pos
, SEEK_SET
);
350 return fwrite(buf
, 1, size
, s
->stdio_file
);
353 static int file_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
355 QEMUFileStdio
*s
= opaque
;
356 fseek(s
->stdio_file
, pos
, SEEK_SET
);
357 return fread(buf
, 1, size
, s
->stdio_file
);
360 QEMUFile
*qemu_fopen(const char *filename
, const char *mode
)
365 (mode
[0] != 'r' && mode
[0] != 'w') ||
366 mode
[1] != 'b' || mode
[2] != 0) {
367 fprintf(stderr
, "qemu_fopen: Argument validity check failed\n");
371 s
= g_malloc0(sizeof(QEMUFileStdio
));
373 s
->stdio_file
= fopen(filename
, mode
);
378 s
->file
= qemu_fopen_ops(s
, file_put_buffer
, NULL
, stdio_fclose
,
381 s
->file
= qemu_fopen_ops(s
, NULL
, file_get_buffer
, stdio_fclose
,
390 static int block_put_buffer(void *opaque
, const uint8_t *buf
,
391 int64_t pos
, int size
)
393 bdrv_save_vmstate(opaque
, buf
, pos
, size
);
397 static int block_get_buffer(void *opaque
, uint8_t *buf
, int64_t pos
, int size
)
399 return bdrv_load_vmstate(opaque
, buf
, pos
, size
);
402 static int bdrv_fclose(void *opaque
)
404 return bdrv_flush(opaque
);
407 static QEMUFile
*qemu_fopen_bdrv(BlockDriverState
*bs
, int is_writable
)
410 return qemu_fopen_ops(bs
, block_put_buffer
, NULL
, bdrv_fclose
,
412 return qemu_fopen_ops(bs
, NULL
, block_get_buffer
, bdrv_fclose
, NULL
, NULL
, NULL
);
415 QEMUFile
*qemu_fopen_ops(void *opaque
, QEMUFilePutBufferFunc
*put_buffer
,
416 QEMUFileGetBufferFunc
*get_buffer
,
417 QEMUFileCloseFunc
*close
,
418 QEMUFileRateLimit
*rate_limit
,
419 QEMUFileSetRateLimit
*set_rate_limit
,
420 QEMUFileGetRateLimit
*get_rate_limit
)
424 f
= g_malloc0(sizeof(QEMUFile
));
427 f
->put_buffer
= put_buffer
;
428 f
->get_buffer
= get_buffer
;
430 f
->rate_limit
= rate_limit
;
431 f
->set_rate_limit
= set_rate_limit
;
432 f
->get_rate_limit
= get_rate_limit
;
438 int qemu_file_get_error(QEMUFile
*f
)
440 return f
->last_error
;
443 void qemu_file_set_error(QEMUFile
*f
, int ret
)
448 /** Sets last_error conditionally
450 * Sets last_error only if ret is negative _and_ no error
453 static void qemu_file_set_if_error(QEMUFile
*f
, int ret
)
455 if (ret
< 0 && !f
->last_error
) {
456 qemu_file_set_error(f
, ret
);
460 /** Flushes QEMUFile buffer
463 static int qemu_fflush(QEMUFile
*f
)
470 if (f
->is_write
&& f
->buf_index
> 0) {
471 ret
= f
->put_buffer(f
->opaque
, f
->buf
, f
->buf_offset
, f
->buf_index
);
473 f
->buf_offset
+= f
->buf_index
;
480 static void qemu_fill_buffer(QEMUFile
*f
)
491 pending
= f
->buf_size
- f
->buf_index
;
493 memmove(f
->buf
, f
->buf
+ f
->buf_index
, pending
);
496 f
->buf_size
= pending
;
498 len
= f
->get_buffer(f
->opaque
, f
->buf
+ pending
, f
->buf_offset
,
499 IO_BUF_SIZE
- pending
);
502 f
->buf_offset
+= len
;
503 } else if (len
== 0) {
504 f
->last_error
= -EIO
;
505 } else if (len
!= -EAGAIN
)
506 qemu_file_set_error(f
, len
);
511 * Returns negative error value if any error happened on previous operations or
512 * while closing the file. Returns 0 or positive number on success.
514 * The meaning of return value on success depends on the specific backend
517 int qemu_fclose(QEMUFile
*f
)
520 ret
= qemu_fflush(f
);
523 int ret2
= f
->close(f
->opaque
);
528 /* If any error was spotted before closing, we should report it
529 * instead of the close() return value.
538 void qemu_file_put_notify(QEMUFile
*f
)
540 f
->put_buffer(f
->opaque
, NULL
, 0, 0);
543 void qemu_put_buffer(QEMUFile
*f
, const uint8_t *buf
, int size
)
547 if (!f
->last_error
&& f
->is_write
== 0 && f
->buf_index
> 0) {
549 "Attempted to write to buffer while read buffer is not empty\n");
553 while (!f
->last_error
&& size
> 0) {
554 l
= IO_BUF_SIZE
- f
->buf_index
;
557 memcpy(f
->buf
+ f
->buf_index
, buf
, l
);
562 if (f
->buf_index
>= IO_BUF_SIZE
) {
563 int ret
= qemu_fflush(f
);
564 qemu_file_set_if_error(f
, ret
);
569 void qemu_put_byte(QEMUFile
*f
, int v
)
571 if (!f
->last_error
&& f
->is_write
== 0 && f
->buf_index
> 0) {
573 "Attempted to write to buffer while read buffer is not empty\n");
577 f
->buf
[f
->buf_index
++] = v
;
579 if (f
->buf_index
>= IO_BUF_SIZE
) {
580 int ret
= qemu_fflush(f
);
581 qemu_file_set_if_error(f
, ret
);
585 static void qemu_file_skip(QEMUFile
*f
, int size
)
587 if (f
->buf_index
+ size
<= f
->buf_size
) {
588 f
->buf_index
+= size
;
592 static int qemu_peek_buffer(QEMUFile
*f
, uint8_t *buf
, int size
, size_t offset
)
601 index
= f
->buf_index
+ offset
;
602 pending
= f
->buf_size
- index
;
603 if (pending
< size
) {
605 index
= f
->buf_index
+ offset
;
606 pending
= f
->buf_size
- index
;
612 if (size
> pending
) {
616 memcpy(buf
, f
->buf
+ index
, size
);
620 int qemu_get_buffer(QEMUFile
*f
, uint8_t *buf
, int size
)
625 while (pending
> 0) {
628 res
= qemu_peek_buffer(f
, buf
, pending
, 0);
632 qemu_file_skip(f
, res
);
640 static int qemu_peek_byte(QEMUFile
*f
, int offset
)
642 int index
= f
->buf_index
+ offset
;
648 if (index
>= f
->buf_size
) {
650 index
= f
->buf_index
+ offset
;
651 if (index
>= f
->buf_size
) {
655 return f
->buf
[index
];
658 int qemu_get_byte(QEMUFile
*f
)
662 result
= qemu_peek_byte(f
, 0);
663 qemu_file_skip(f
, 1);
667 int64_t qemu_ftell(QEMUFile
*f
)
669 return f
->buf_offset
- f
->buf_size
+ f
->buf_index
;
672 int qemu_file_rate_limit(QEMUFile
*f
)
675 return f
->rate_limit(f
->opaque
);
680 int64_t qemu_file_get_rate_limit(QEMUFile
*f
)
682 if (f
->get_rate_limit
)
683 return f
->get_rate_limit(f
->opaque
);
688 int64_t qemu_file_set_rate_limit(QEMUFile
*f
, int64_t new_rate
)
690 /* any failed or completed migration keeps its state to allow probing of
691 * migration data, but has no associated file anymore */
692 if (f
&& f
->set_rate_limit
)
693 return f
->set_rate_limit(f
->opaque
, new_rate
);
698 void qemu_put_be16(QEMUFile
*f
, unsigned int v
)
700 qemu_put_byte(f
, v
>> 8);
704 void qemu_put_be32(QEMUFile
*f
, unsigned int v
)
706 qemu_put_byte(f
, v
>> 24);
707 qemu_put_byte(f
, v
>> 16);
708 qemu_put_byte(f
, v
>> 8);
712 void qemu_put_be64(QEMUFile
*f
, uint64_t v
)
714 qemu_put_be32(f
, v
>> 32);
718 unsigned int qemu_get_be16(QEMUFile
*f
)
721 v
= qemu_get_byte(f
) << 8;
722 v
|= qemu_get_byte(f
);
726 unsigned int qemu_get_be32(QEMUFile
*f
)
729 v
= qemu_get_byte(f
) << 24;
730 v
|= qemu_get_byte(f
) << 16;
731 v
|= qemu_get_byte(f
) << 8;
732 v
|= qemu_get_byte(f
);
736 uint64_t qemu_get_be64(QEMUFile
*f
)
739 v
= (uint64_t)qemu_get_be32(f
) << 32;
740 v
|= qemu_get_be32(f
);
747 void qemu_put_timer(QEMUFile
*f
, QEMUTimer
*ts
)
749 uint64_t expire_time
;
751 expire_time
= qemu_timer_expire_time_ns(ts
);
752 qemu_put_be64(f
, expire_time
);
755 void qemu_get_timer(QEMUFile
*f
, QEMUTimer
*ts
)
757 uint64_t expire_time
;
759 expire_time
= qemu_get_be64(f
);
760 if (expire_time
!= -1) {
761 qemu_mod_timer_ns(ts
, expire_time
);
770 static int get_bool(QEMUFile
*f
, void *pv
, size_t size
)
773 *v
= qemu_get_byte(f
);
777 static void put_bool(QEMUFile
*f
, void *pv
, size_t size
)
780 qemu_put_byte(f
, *v
);
783 const VMStateInfo vmstate_info_bool
= {
791 static int get_int8(QEMUFile
*f
, void *pv
, size_t size
)
798 static void put_int8(QEMUFile
*f
, void *pv
, size_t size
)
804 const VMStateInfo vmstate_info_int8
= {
812 static int get_int16(QEMUFile
*f
, void *pv
, size_t size
)
815 qemu_get_sbe16s(f
, v
);
819 static void put_int16(QEMUFile
*f
, void *pv
, size_t size
)
822 qemu_put_sbe16s(f
, v
);
825 const VMStateInfo vmstate_info_int16
= {
833 static int get_int32(QEMUFile
*f
, void *pv
, size_t size
)
836 qemu_get_sbe32s(f
, v
);
840 static void put_int32(QEMUFile
*f
, void *pv
, size_t size
)
843 qemu_put_sbe32s(f
, v
);
846 const VMStateInfo vmstate_info_int32
= {
852 /* 32 bit int. See that the received value is the same than the one
855 static int get_int32_equal(QEMUFile
*f
, void *pv
, size_t size
)
859 qemu_get_sbe32s(f
, &v2
);
866 const VMStateInfo vmstate_info_int32_equal
= {
867 .name
= "int32 equal",
868 .get
= get_int32_equal
,
872 /* 32 bit int. See that the received value is the less or the same
873 than the one in the field */
875 static int get_int32_le(QEMUFile
*f
, void *pv
, size_t size
)
879 qemu_get_sbe32s(f
, &new);
886 const VMStateInfo vmstate_info_int32_le
= {
887 .name
= "int32 equal",
894 static int get_int64(QEMUFile
*f
, void *pv
, size_t size
)
897 qemu_get_sbe64s(f
, v
);
901 static void put_int64(QEMUFile
*f
, void *pv
, size_t size
)
904 qemu_put_sbe64s(f
, v
);
907 const VMStateInfo vmstate_info_int64
= {
913 /* 8 bit unsigned int */
915 static int get_uint8(QEMUFile
*f
, void *pv
, size_t size
)
922 static void put_uint8(QEMUFile
*f
, void *pv
, size_t size
)
928 const VMStateInfo vmstate_info_uint8
= {
934 /* 16 bit unsigned int */
936 static int get_uint16(QEMUFile
*f
, void *pv
, size_t size
)
939 qemu_get_be16s(f
, v
);
943 static void put_uint16(QEMUFile
*f
, void *pv
, size_t size
)
946 qemu_put_be16s(f
, v
);
949 const VMStateInfo vmstate_info_uint16
= {
955 /* 32 bit unsigned int */
957 static int get_uint32(QEMUFile
*f
, void *pv
, size_t size
)
960 qemu_get_be32s(f
, v
);
964 static void put_uint32(QEMUFile
*f
, void *pv
, size_t size
)
967 qemu_put_be32s(f
, v
);
970 const VMStateInfo vmstate_info_uint32
= {
976 /* 32 bit uint. See that the received value is the same than the one
979 static int get_uint32_equal(QEMUFile
*f
, void *pv
, size_t size
)
983 qemu_get_be32s(f
, &v2
);
991 const VMStateInfo vmstate_info_uint32_equal
= {
992 .name
= "uint32 equal",
993 .get
= get_uint32_equal
,
997 /* 64 bit unsigned int */
999 static int get_uint64(QEMUFile
*f
, void *pv
, size_t size
)
1002 qemu_get_be64s(f
, v
);
1006 static void put_uint64(QEMUFile
*f
, void *pv
, size_t size
)
1009 qemu_put_be64s(f
, v
);
1012 const VMStateInfo vmstate_info_uint64
= {
1018 /* 8 bit int. See that the received value is the same than the one
1021 static int get_uint8_equal(QEMUFile
*f
, void *pv
, size_t size
)
1025 qemu_get_8s(f
, &v2
);
1032 const VMStateInfo vmstate_info_uint8_equal
= {
1033 .name
= "uint8 equal",
1034 .get
= get_uint8_equal
,
1038 /* 16 bit unsigned int int. See that the received value is the same than the one
1041 static int get_uint16_equal(QEMUFile
*f
, void *pv
, size_t size
)
1045 qemu_get_be16s(f
, &v2
);
1052 const VMStateInfo vmstate_info_uint16_equal
= {
1053 .name
= "uint16 equal",
1054 .get
= get_uint16_equal
,
1060 static int get_timer(QEMUFile
*f
, void *pv
, size_t size
)
1063 qemu_get_timer(f
, v
);
1067 static void put_timer(QEMUFile
*f
, void *pv
, size_t size
)
1070 qemu_put_timer(f
, v
);
1073 const VMStateInfo vmstate_info_timer
= {
1079 /* uint8_t buffers */
1081 static int get_buffer(QEMUFile
*f
, void *pv
, size_t size
)
1084 qemu_get_buffer(f
, v
, size
);
1088 static void put_buffer(QEMUFile
*f
, void *pv
, size_t size
)
1091 qemu_put_buffer(f
, v
, size
);
1094 const VMStateInfo vmstate_info_buffer
= {
1100 /* unused buffers: space that was used for some fields that are
1101 not useful anymore */
1103 static int get_unused_buffer(QEMUFile
*f
, void *pv
, size_t size
)
1109 block_len
= MIN(sizeof(buf
), size
);
1111 qemu_get_buffer(f
, buf
, block_len
);
1116 static void put_unused_buffer(QEMUFile
*f
, void *pv
, size_t size
)
1118 static const uint8_t buf
[1024];
1122 block_len
= MIN(sizeof(buf
), size
);
1124 qemu_put_buffer(f
, buf
, block_len
);
1128 const VMStateInfo vmstate_info_unused_buffer
= {
1129 .name
= "unused_buffer",
1130 .get
= get_unused_buffer
,
1131 .put
= put_unused_buffer
,
1134 typedef struct CompatEntry
{
1139 typedef struct SaveStateEntry
{
1140 QTAILQ_ENTRY(SaveStateEntry
) entry
;
1146 SaveVMHandlers
*ops
;
1147 const VMStateDescription
*vmsd
;
1149 CompatEntry
*compat
;
1155 static QTAILQ_HEAD(savevm_handlers
, SaveStateEntry
) savevm_handlers
=
1156 QTAILQ_HEAD_INITIALIZER(savevm_handlers
);
1157 static int global_section_id
;
1159 static int calculate_new_instance_id(const char *idstr
)
1162 int instance_id
= 0;
1164 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1165 if (strcmp(idstr
, se
->idstr
) == 0
1166 && instance_id
<= se
->instance_id
) {
1167 instance_id
= se
->instance_id
+ 1;
1173 static int calculate_compat_instance_id(const char *idstr
)
1176 int instance_id
= 0;
1178 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1182 if (strcmp(idstr
, se
->compat
->idstr
) == 0
1183 && instance_id
<= se
->compat
->instance_id
) {
1184 instance_id
= se
->compat
->instance_id
+ 1;
1190 /* TODO: Individual devices generally have very little idea about the rest
1191 of the system, so instance_id should be removed/replaced.
1192 Meanwhile pass -1 as instance_id if you do not already have a clearly
1193 distinguishing id for all instances of your device class. */
1194 int register_savevm_live(DeviceState
*dev
,
1198 SaveVMHandlers
*ops
,
1203 se
= g_malloc0(sizeof(SaveStateEntry
));
1204 se
->version_id
= version_id
;
1205 se
->section_id
= global_section_id
++;
1207 se
->opaque
= opaque
;
1210 /* if this is a live_savem then set is_ram */
1211 if (ops
->save_live_setup
!= NULL
) {
1216 char *id
= qdev_get_dev_path(dev
);
1218 pstrcpy(se
->idstr
, sizeof(se
->idstr
), id
);
1219 pstrcat(se
->idstr
, sizeof(se
->idstr
), "/");
1222 se
->compat
= g_malloc0(sizeof(CompatEntry
));
1223 pstrcpy(se
->compat
->idstr
, sizeof(se
->compat
->idstr
), idstr
);
1224 se
->compat
->instance_id
= instance_id
== -1 ?
1225 calculate_compat_instance_id(idstr
) : instance_id
;
1229 pstrcat(se
->idstr
, sizeof(se
->idstr
), idstr
);
1231 if (instance_id
== -1) {
1232 se
->instance_id
= calculate_new_instance_id(se
->idstr
);
1234 se
->instance_id
= instance_id
;
1236 assert(!se
->compat
|| se
->instance_id
== 0);
1237 /* add at the end of list */
1238 QTAILQ_INSERT_TAIL(&savevm_handlers
, se
, entry
);
1242 int register_savevm(DeviceState
*dev
,
1246 SaveStateHandler
*save_state
,
1247 LoadStateHandler
*load_state
,
1250 SaveVMHandlers
*ops
= g_malloc0(sizeof(SaveVMHandlers
));
1251 ops
->save_state
= save_state
;
1252 ops
->load_state
= load_state
;
1253 return register_savevm_live(dev
, idstr
, instance_id
, version_id
,
1257 void unregister_savevm(DeviceState
*dev
, const char *idstr
, void *opaque
)
1259 SaveStateEntry
*se
, *new_se
;
1263 char *path
= qdev_get_dev_path(dev
);
1265 pstrcpy(id
, sizeof(id
), path
);
1266 pstrcat(id
, sizeof(id
), "/");
1270 pstrcat(id
, sizeof(id
), idstr
);
1272 QTAILQ_FOREACH_SAFE(se
, &savevm_handlers
, entry
, new_se
) {
1273 if (strcmp(se
->idstr
, id
) == 0 && se
->opaque
== opaque
) {
1274 QTAILQ_REMOVE(&savevm_handlers
, se
, entry
);
1284 int vmstate_register_with_alias_id(DeviceState
*dev
, int instance_id
,
1285 const VMStateDescription
*vmsd
,
1286 void *opaque
, int alias_id
,
1287 int required_for_version
)
1291 /* If this triggers, alias support can be dropped for the vmsd. */
1292 assert(alias_id
== -1 || required_for_version
>= vmsd
->minimum_version_id
);
1294 se
= g_malloc0(sizeof(SaveStateEntry
));
1295 se
->version_id
= vmsd
->version_id
;
1296 se
->section_id
= global_section_id
++;
1297 se
->opaque
= opaque
;
1299 se
->alias_id
= alias_id
;
1300 se
->no_migrate
= vmsd
->unmigratable
;
1303 char *id
= qdev_get_dev_path(dev
);
1305 pstrcpy(se
->idstr
, sizeof(se
->idstr
), id
);
1306 pstrcat(se
->idstr
, sizeof(se
->idstr
), "/");
1309 se
->compat
= g_malloc0(sizeof(CompatEntry
));
1310 pstrcpy(se
->compat
->idstr
, sizeof(se
->compat
->idstr
), vmsd
->name
);
1311 se
->compat
->instance_id
= instance_id
== -1 ?
1312 calculate_compat_instance_id(vmsd
->name
) : instance_id
;
1316 pstrcat(se
->idstr
, sizeof(se
->idstr
), vmsd
->name
);
1318 if (instance_id
== -1) {
1319 se
->instance_id
= calculate_new_instance_id(se
->idstr
);
1321 se
->instance_id
= instance_id
;
1323 assert(!se
->compat
|| se
->instance_id
== 0);
1324 /* add at the end of list */
1325 QTAILQ_INSERT_TAIL(&savevm_handlers
, se
, entry
);
1329 int vmstate_register(DeviceState
*dev
, int instance_id
,
1330 const VMStateDescription
*vmsd
, void *opaque
)
1332 return vmstate_register_with_alias_id(dev
, instance_id
, vmsd
,
1336 void vmstate_unregister(DeviceState
*dev
, const VMStateDescription
*vmsd
,
1339 SaveStateEntry
*se
, *new_se
;
1341 QTAILQ_FOREACH_SAFE(se
, &savevm_handlers
, entry
, new_se
) {
1342 if (se
->vmsd
== vmsd
&& se
->opaque
== opaque
) {
1343 QTAILQ_REMOVE(&savevm_handlers
, se
, entry
);
1352 static void vmstate_subsection_save(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1354 static int vmstate_subsection_load(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1357 int vmstate_load_state(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1358 void *opaque
, int version_id
)
1360 VMStateField
*field
= vmsd
->fields
;
1363 if (version_id
> vmsd
->version_id
) {
1366 if (version_id
< vmsd
->minimum_version_id_old
) {
1369 if (version_id
< vmsd
->minimum_version_id
) {
1370 return vmsd
->load_state_old(f
, opaque
, version_id
);
1372 if (vmsd
->pre_load
) {
1373 int ret
= vmsd
->pre_load(opaque
);
1377 while(field
->name
) {
1378 if ((field
->field_exists
&&
1379 field
->field_exists(opaque
, version_id
)) ||
1380 (!field
->field_exists
&&
1381 field
->version_id
<= version_id
)) {
1382 void *base_addr
= opaque
+ field
->offset
;
1384 int size
= field
->size
;
1386 if (field
->flags
& VMS_VBUFFER
) {
1387 size
= *(int32_t *)(opaque
+field
->size_offset
);
1388 if (field
->flags
& VMS_MULTIPLY
) {
1389 size
*= field
->size
;
1392 if (field
->flags
& VMS_ARRAY
) {
1393 n_elems
= field
->num
;
1394 } else if (field
->flags
& VMS_VARRAY_INT32
) {
1395 n_elems
= *(int32_t *)(opaque
+field
->num_offset
);
1396 } else if (field
->flags
& VMS_VARRAY_UINT32
) {
1397 n_elems
= *(uint32_t *)(opaque
+field
->num_offset
);
1398 } else if (field
->flags
& VMS_VARRAY_UINT16
) {
1399 n_elems
= *(uint16_t *)(opaque
+field
->num_offset
);
1400 } else if (field
->flags
& VMS_VARRAY_UINT8
) {
1401 n_elems
= *(uint8_t *)(opaque
+field
->num_offset
);
1403 if (field
->flags
& VMS_POINTER
) {
1404 base_addr
= *(void **)base_addr
+ field
->start
;
1406 for (i
= 0; i
< n_elems
; i
++) {
1407 void *addr
= base_addr
+ size
* i
;
1409 if (field
->flags
& VMS_ARRAY_OF_POINTER
) {
1410 addr
= *(void **)addr
;
1412 if (field
->flags
& VMS_STRUCT
) {
1413 ret
= vmstate_load_state(f
, field
->vmsd
, addr
, field
->vmsd
->version_id
);
1415 ret
= field
->info
->get(f
, addr
, size
);
1425 ret
= vmstate_subsection_load(f
, vmsd
, opaque
);
1429 if (vmsd
->post_load
) {
1430 return vmsd
->post_load(opaque
, version_id
);
1435 void vmstate_save_state(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1438 VMStateField
*field
= vmsd
->fields
;
1440 if (vmsd
->pre_save
) {
1441 vmsd
->pre_save(opaque
);
1443 while(field
->name
) {
1444 if (!field
->field_exists
||
1445 field
->field_exists(opaque
, vmsd
->version_id
)) {
1446 void *base_addr
= opaque
+ field
->offset
;
1448 int size
= field
->size
;
1450 if (field
->flags
& VMS_VBUFFER
) {
1451 size
= *(int32_t *)(opaque
+field
->size_offset
);
1452 if (field
->flags
& VMS_MULTIPLY
) {
1453 size
*= field
->size
;
1456 if (field
->flags
& VMS_ARRAY
) {
1457 n_elems
= field
->num
;
1458 } else if (field
->flags
& VMS_VARRAY_INT32
) {
1459 n_elems
= *(int32_t *)(opaque
+field
->num_offset
);
1460 } else if (field
->flags
& VMS_VARRAY_UINT32
) {
1461 n_elems
= *(uint32_t *)(opaque
+field
->num_offset
);
1462 } else if (field
->flags
& VMS_VARRAY_UINT16
) {
1463 n_elems
= *(uint16_t *)(opaque
+field
->num_offset
);
1464 } else if (field
->flags
& VMS_VARRAY_UINT8
) {
1465 n_elems
= *(uint8_t *)(opaque
+field
->num_offset
);
1467 if (field
->flags
& VMS_POINTER
) {
1468 base_addr
= *(void **)base_addr
+ field
->start
;
1470 for (i
= 0; i
< n_elems
; i
++) {
1471 void *addr
= base_addr
+ size
* i
;
1473 if (field
->flags
& VMS_ARRAY_OF_POINTER
) {
1474 addr
= *(void **)addr
;
1476 if (field
->flags
& VMS_STRUCT
) {
1477 vmstate_save_state(f
, field
->vmsd
, addr
);
1479 field
->info
->put(f
, addr
, size
);
1485 vmstate_subsection_save(f
, vmsd
, opaque
);
1488 static int vmstate_load(QEMUFile
*f
, SaveStateEntry
*se
, int version_id
)
1490 if (!se
->vmsd
) { /* Old style */
1491 return se
->ops
->load_state(f
, se
->opaque
, version_id
);
1493 return vmstate_load_state(f
, se
->vmsd
, se
->opaque
, version_id
);
1496 static void vmstate_save(QEMUFile
*f
, SaveStateEntry
*se
)
1498 if (!se
->vmsd
) { /* Old style */
1499 se
->ops
->save_state(f
, se
->opaque
);
1502 vmstate_save_state(f
,se
->vmsd
, se
->opaque
);
1505 #define QEMU_VM_FILE_MAGIC 0x5145564d
1506 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1507 #define QEMU_VM_FILE_VERSION 0x00000003
1509 #define QEMU_VM_EOF 0x00
1510 #define QEMU_VM_SECTION_START 0x01
1511 #define QEMU_VM_SECTION_PART 0x02
1512 #define QEMU_VM_SECTION_END 0x03
1513 #define QEMU_VM_SECTION_FULL 0x04
1514 #define QEMU_VM_SUBSECTION 0x05
1516 bool qemu_savevm_state_blocked(Error
**errp
)
1520 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1521 if (se
->no_migrate
) {
1522 error_set(errp
, QERR_MIGRATION_NOT_SUPPORTED
, se
->idstr
);
1529 int qemu_savevm_state_begin(QEMUFile
*f
,
1530 const MigrationParams
*params
)
1535 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1536 if (!se
->ops
|| !se
->ops
->set_params
) {
1539 se
->ops
->set_params(params
, se
->opaque
);
1542 qemu_put_be32(f
, QEMU_VM_FILE_MAGIC
);
1543 qemu_put_be32(f
, QEMU_VM_FILE_VERSION
);
1545 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1548 if (!se
->ops
|| !se
->ops
->save_live_setup
) {
1551 if (se
->ops
&& se
->ops
->is_active
) {
1552 if (!se
->ops
->is_active(se
->opaque
)) {
1557 qemu_put_byte(f
, QEMU_VM_SECTION_START
);
1558 qemu_put_be32(f
, se
->section_id
);
1561 len
= strlen(se
->idstr
);
1562 qemu_put_byte(f
, len
);
1563 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
1565 qemu_put_be32(f
, se
->instance_id
);
1566 qemu_put_be32(f
, se
->version_id
);
1568 ret
= se
->ops
->save_live_setup(f
, se
->opaque
);
1570 qemu_savevm_state_cancel(f
);
1574 ret
= qemu_file_get_error(f
);
1576 qemu_savevm_state_cancel(f
);
1584 * this function has three return values:
1585 * negative: there was one error, and we have -errno.
1586 * 0 : We haven't finished, caller have to go again
1587 * 1 : We have finished, we can go to complete phase
1589 int qemu_savevm_state_iterate(QEMUFile
*f
)
1594 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1595 if (!se
->ops
|| !se
->ops
->save_live_iterate
) {
1598 if (se
->ops
&& se
->ops
->is_active
) {
1599 if (!se
->ops
->is_active(se
->opaque
)) {
1603 if (qemu_file_rate_limit(f
)) {
1606 trace_savevm_section_start();
1608 qemu_put_byte(f
, QEMU_VM_SECTION_PART
);
1609 qemu_put_be32(f
, se
->section_id
);
1611 ret
= se
->ops
->save_live_iterate(f
, se
->opaque
);
1612 trace_savevm_section_end(se
->section_id
);
1615 /* Do not proceed to the next vmstate before this one reported
1616 completion of the current stage. This serializes the migration
1617 and reduces the probability that a faster changing state is
1618 synchronized over and over again. */
1625 ret
= qemu_file_get_error(f
);
1627 qemu_savevm_state_cancel(f
);
1632 int qemu_savevm_state_complete(QEMUFile
*f
)
1637 cpu_synchronize_all_states();
1639 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1640 if (!se
->ops
|| !se
->ops
->save_live_complete
) {
1643 if (se
->ops
&& se
->ops
->is_active
) {
1644 if (!se
->ops
->is_active(se
->opaque
)) {
1648 trace_savevm_section_start();
1650 qemu_put_byte(f
, QEMU_VM_SECTION_END
);
1651 qemu_put_be32(f
, se
->section_id
);
1653 ret
= se
->ops
->save_live_complete(f
, se
->opaque
);
1654 trace_savevm_section_end(se
->section_id
);
1660 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1663 if ((!se
->ops
|| !se
->ops
->save_state
) && !se
->vmsd
) {
1666 trace_savevm_section_start();
1668 qemu_put_byte(f
, QEMU_VM_SECTION_FULL
);
1669 qemu_put_be32(f
, se
->section_id
);
1672 len
= strlen(se
->idstr
);
1673 qemu_put_byte(f
, len
);
1674 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
1676 qemu_put_be32(f
, se
->instance_id
);
1677 qemu_put_be32(f
, se
->version_id
);
1679 vmstate_save(f
, se
);
1680 trace_savevm_section_end(se
->section_id
);
1683 qemu_put_byte(f
, QEMU_VM_EOF
);
1685 return qemu_file_get_error(f
);
1688 void qemu_savevm_state_cancel(QEMUFile
*f
)
1692 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1693 if (se
->ops
&& se
->ops
->cancel
) {
1694 se
->ops
->cancel(se
->opaque
);
1699 static int qemu_savevm_state(QEMUFile
*f
)
1702 MigrationParams params
= {
1707 if (qemu_savevm_state_blocked(NULL
)) {
1712 ret
= qemu_savevm_state_begin(f
, ¶ms
);
1717 ret
= qemu_savevm_state_iterate(f
);
1722 ret
= qemu_savevm_state_complete(f
);
1726 ret
= qemu_file_get_error(f
);
1732 static int qemu_save_device_state(QEMUFile
*f
)
1736 qemu_put_be32(f
, QEMU_VM_FILE_MAGIC
);
1737 qemu_put_be32(f
, QEMU_VM_FILE_VERSION
);
1739 cpu_synchronize_all_states();
1741 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1747 if ((!se
->ops
|| !se
->ops
->save_state
) && !se
->vmsd
) {
1752 qemu_put_byte(f
, QEMU_VM_SECTION_FULL
);
1753 qemu_put_be32(f
, se
->section_id
);
1756 len
= strlen(se
->idstr
);
1757 qemu_put_byte(f
, len
);
1758 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
1760 qemu_put_be32(f
, se
->instance_id
);
1761 qemu_put_be32(f
, se
->version_id
);
1763 vmstate_save(f
, se
);
1766 qemu_put_byte(f
, QEMU_VM_EOF
);
1768 return qemu_file_get_error(f
);
1771 static SaveStateEntry
*find_se(const char *idstr
, int instance_id
)
1775 QTAILQ_FOREACH(se
, &savevm_handlers
, entry
) {
1776 if (!strcmp(se
->idstr
, idstr
) &&
1777 (instance_id
== se
->instance_id
||
1778 instance_id
== se
->alias_id
))
1780 /* Migrating from an older version? */
1781 if (strstr(se
->idstr
, idstr
) && se
->compat
) {
1782 if (!strcmp(se
->compat
->idstr
, idstr
) &&
1783 (instance_id
== se
->compat
->instance_id
||
1784 instance_id
== se
->alias_id
))
1791 static const VMStateDescription
*vmstate_get_subsection(const VMStateSubsection
*sub
, char *idstr
)
1793 while(sub
&& sub
->needed
) {
1794 if (strcmp(idstr
, sub
->vmsd
->name
) == 0) {
1802 static int vmstate_subsection_load(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1805 while (qemu_peek_byte(f
, 0) == QEMU_VM_SUBSECTION
) {
1808 uint8_t version_id
, len
, size
;
1809 const VMStateDescription
*sub_vmsd
;
1811 len
= qemu_peek_byte(f
, 1);
1812 if (len
< strlen(vmsd
->name
) + 1) {
1813 /* subsection name has be be "section_name/a" */
1816 size
= qemu_peek_buffer(f
, (uint8_t *)idstr
, len
, 2);
1822 if (strncmp(vmsd
->name
, idstr
, strlen(vmsd
->name
)) != 0) {
1823 /* it don't have a valid subsection name */
1826 sub_vmsd
= vmstate_get_subsection(vmsd
->subsections
, idstr
);
1827 if (sub_vmsd
== NULL
) {
1830 qemu_file_skip(f
, 1); /* subsection */
1831 qemu_file_skip(f
, 1); /* len */
1832 qemu_file_skip(f
, len
); /* idstr */
1833 version_id
= qemu_get_be32(f
);
1835 ret
= vmstate_load_state(f
, sub_vmsd
, opaque
, version_id
);
1843 static void vmstate_subsection_save(QEMUFile
*f
, const VMStateDescription
*vmsd
,
1846 const VMStateSubsection
*sub
= vmsd
->subsections
;
1848 while (sub
&& sub
->needed
) {
1849 if (sub
->needed(opaque
)) {
1850 const VMStateDescription
*vmsd
= sub
->vmsd
;
1853 qemu_put_byte(f
, QEMU_VM_SUBSECTION
);
1854 len
= strlen(vmsd
->name
);
1855 qemu_put_byte(f
, len
);
1856 qemu_put_buffer(f
, (uint8_t *)vmsd
->name
, len
);
1857 qemu_put_be32(f
, vmsd
->version_id
);
1858 vmstate_save_state(f
, vmsd
, opaque
);
1864 typedef struct LoadStateEntry
{
1865 QLIST_ENTRY(LoadStateEntry
) entry
;
1871 int qemu_loadvm_state(QEMUFile
*f
)
1873 QLIST_HEAD(, LoadStateEntry
) loadvm_handlers
=
1874 QLIST_HEAD_INITIALIZER(loadvm_handlers
);
1875 LoadStateEntry
*le
, *new_le
;
1876 uint8_t section_type
;
1880 if (qemu_savevm_state_blocked(NULL
)) {
1884 v
= qemu_get_be32(f
);
1885 if (v
!= QEMU_VM_FILE_MAGIC
)
1888 v
= qemu_get_be32(f
);
1889 if (v
== QEMU_VM_FILE_VERSION_COMPAT
) {
1890 fprintf(stderr
, "SaveVM v2 format is obsolete and don't work anymore\n");
1893 if (v
!= QEMU_VM_FILE_VERSION
)
1896 while ((section_type
= qemu_get_byte(f
)) != QEMU_VM_EOF
) {
1897 uint32_t instance_id
, version_id
, section_id
;
1902 switch (section_type
) {
1903 case QEMU_VM_SECTION_START
:
1904 case QEMU_VM_SECTION_FULL
:
1905 /* Read section start */
1906 section_id
= qemu_get_be32(f
);
1907 len
= qemu_get_byte(f
);
1908 qemu_get_buffer(f
, (uint8_t *)idstr
, len
);
1910 instance_id
= qemu_get_be32(f
);
1911 version_id
= qemu_get_be32(f
);
1913 /* Find savevm section */
1914 se
= find_se(idstr
, instance_id
);
1916 fprintf(stderr
, "Unknown savevm section or instance '%s' %d\n", idstr
, instance_id
);
1921 /* Validate version */
1922 if (version_id
> se
->version_id
) {
1923 fprintf(stderr
, "savevm: unsupported version %d for '%s' v%d\n",
1924 version_id
, idstr
, se
->version_id
);
1930 le
= g_malloc0(sizeof(*le
));
1933 le
->section_id
= section_id
;
1934 le
->version_id
= version_id
;
1935 QLIST_INSERT_HEAD(&loadvm_handlers
, le
, entry
);
1937 ret
= vmstate_load(f
, le
->se
, le
->version_id
);
1939 fprintf(stderr
, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1940 instance_id
, idstr
);
1944 case QEMU_VM_SECTION_PART
:
1945 case QEMU_VM_SECTION_END
:
1946 section_id
= qemu_get_be32(f
);
1948 QLIST_FOREACH(le
, &loadvm_handlers
, entry
) {
1949 if (le
->section_id
== section_id
) {
1954 fprintf(stderr
, "Unknown savevm section %d\n", section_id
);
1959 ret
= vmstate_load(f
, le
->se
, le
->version_id
);
1961 fprintf(stderr
, "qemu: warning: error while loading state section id %d\n",
1967 fprintf(stderr
, "Unknown savevm section type %d\n", section_type
);
1973 cpu_synchronize_all_post_init();
1978 QLIST_FOREACH_SAFE(le
, &loadvm_handlers
, entry
, new_le
) {
1979 QLIST_REMOVE(le
, entry
);
1984 ret
= qemu_file_get_error(f
);
1990 static int bdrv_snapshot_find(BlockDriverState
*bs
, QEMUSnapshotInfo
*sn_info
,
1993 QEMUSnapshotInfo
*sn_tab
, *sn
;
1997 nb_sns
= bdrv_snapshot_list(bs
, &sn_tab
);
2000 for(i
= 0; i
< nb_sns
; i
++) {
2002 if (!strcmp(sn
->id_str
, name
) || !strcmp(sn
->name
, name
)) {
2013 * Deletes snapshots of a given name in all opened images.
2015 static int del_existing_snapshots(Monitor
*mon
, const char *name
)
2017 BlockDriverState
*bs
;
2018 QEMUSnapshotInfo sn1
, *snapshot
= &sn1
;
2022 while ((bs
= bdrv_next(bs
))) {
2023 if (bdrv_can_snapshot(bs
) &&
2024 bdrv_snapshot_find(bs
, snapshot
, name
) >= 0)
2026 ret
= bdrv_snapshot_delete(bs
, name
);
2029 "Error while deleting snapshot on '%s'\n",
2030 bdrv_get_device_name(bs
));
2039 void do_savevm(Monitor
*mon
, const QDict
*qdict
)
2041 BlockDriverState
*bs
, *bs1
;
2042 QEMUSnapshotInfo sn1
, *sn
= &sn1
, old_sn1
, *old_sn
= &old_sn1
;
2045 int saved_vm_running
;
2046 uint64_t vm_state_size
;
2054 const char *name
= qdict_get_try_str(qdict
, "name");
2056 /* Verify if there is a device that doesn't support snapshots and is writable */
2058 while ((bs
= bdrv_next(bs
))) {
2060 if (!bdrv_is_inserted(bs
) || bdrv_is_read_only(bs
)) {
2064 if (!bdrv_can_snapshot(bs
)) {
2065 monitor_printf(mon
, "Device '%s' is writable but does not support snapshots.\n",
2066 bdrv_get_device_name(bs
));
2071 bs
= bdrv_snapshots();
2073 monitor_printf(mon
, "No block device can accept snapshots\n");
2077 saved_vm_running
= runstate_is_running();
2078 vm_stop(RUN_STATE_SAVE_VM
);
2080 memset(sn
, 0, sizeof(*sn
));
2082 /* fill auxiliary fields */
2085 sn
->date_sec
= tb
.time
;
2086 sn
->date_nsec
= tb
.millitm
* 1000000;
2088 gettimeofday(&tv
, NULL
);
2089 sn
->date_sec
= tv
.tv_sec
;
2090 sn
->date_nsec
= tv
.tv_usec
* 1000;
2092 sn
->vm_clock_nsec
= qemu_get_clock_ns(vm_clock
);
2095 ret
= bdrv_snapshot_find(bs
, old_sn
, name
);
2097 pstrcpy(sn
->name
, sizeof(sn
->name
), old_sn
->name
);
2098 pstrcpy(sn
->id_str
, sizeof(sn
->id_str
), old_sn
->id_str
);
2100 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
2105 ptm
= localtime(&t
);
2106 strftime(sn
->name
, sizeof(sn
->name
), "vm-%Y%m%d%H%M%S", ptm
);
2108 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2109 localtime_r((const time_t *)&tv
.tv_sec
, &tm
);
2110 strftime(sn
->name
, sizeof(sn
->name
), "vm-%Y%m%d%H%M%S", &tm
);
2114 /* Delete old snapshots of the same name */
2115 if (name
&& del_existing_snapshots(mon
, name
) < 0) {
2119 /* save the VM state */
2120 f
= qemu_fopen_bdrv(bs
, 1);
2122 monitor_printf(mon
, "Could not open VM state file\n");
2125 ret
= qemu_savevm_state(f
);
2126 vm_state_size
= qemu_ftell(f
);
2129 monitor_printf(mon
, "Error %d while writing VM\n", ret
);
2133 /* create the snapshots */
2136 while ((bs1
= bdrv_next(bs1
))) {
2137 if (bdrv_can_snapshot(bs1
)) {
2138 /* Write VM state size only to the image that contains the state */
2139 sn
->vm_state_size
= (bs
== bs1
? vm_state_size
: 0);
2140 ret
= bdrv_snapshot_create(bs1
, sn
);
2142 monitor_printf(mon
, "Error while creating snapshot on '%s'\n",
2143 bdrv_get_device_name(bs1
));
2149 if (saved_vm_running
)
2153 void qmp_xen_save_devices_state(const char *filename
, Error
**errp
)
2156 int saved_vm_running
;
2159 saved_vm_running
= runstate_is_running();
2160 vm_stop(RUN_STATE_SAVE_VM
);
2162 f
= qemu_fopen(filename
, "wb");
2164 error_set(errp
, QERR_OPEN_FILE_FAILED
, filename
);
2167 ret
= qemu_save_device_state(f
);
2170 error_set(errp
, QERR_IO_ERROR
);
2174 if (saved_vm_running
)
2178 int load_vmstate(const char *name
)
2180 BlockDriverState
*bs
, *bs_vm_state
;
2181 QEMUSnapshotInfo sn
;
2185 bs_vm_state
= bdrv_snapshots();
2187 error_report("No block device supports snapshots");
2191 /* Don't even try to load empty VM states */
2192 ret
= bdrv_snapshot_find(bs_vm_state
, &sn
, name
);
2195 } else if (sn
.vm_state_size
== 0) {
2196 error_report("This is a disk-only snapshot. Revert to it offline "
2201 /* Verify if there is any device that doesn't support snapshots and is
2202 writable and check if the requested snapshot is available too. */
2204 while ((bs
= bdrv_next(bs
))) {
2206 if (!bdrv_is_inserted(bs
) || bdrv_is_read_only(bs
)) {
2210 if (!bdrv_can_snapshot(bs
)) {
2211 error_report("Device '%s' is writable but does not support snapshots.",
2212 bdrv_get_device_name(bs
));
2216 ret
= bdrv_snapshot_find(bs
, &sn
, name
);
2218 error_report("Device '%s' does not have the requested snapshot '%s'",
2219 bdrv_get_device_name(bs
), name
);
2224 /* Flush all IO requests so they don't interfere with the new state. */
2228 while ((bs
= bdrv_next(bs
))) {
2229 if (bdrv_can_snapshot(bs
)) {
2230 ret
= bdrv_snapshot_goto(bs
, name
);
2232 error_report("Error %d while activating snapshot '%s' on '%s'",
2233 ret
, name
, bdrv_get_device_name(bs
));
2239 /* restore the VM state */
2240 f
= qemu_fopen_bdrv(bs_vm_state
, 0);
2242 error_report("Could not open VM state file");
2246 qemu_system_reset(VMRESET_SILENT
);
2247 ret
= qemu_loadvm_state(f
);
2251 error_report("Error %d while loading VM state", ret
);
2258 void do_delvm(Monitor
*mon
, const QDict
*qdict
)
2260 BlockDriverState
*bs
, *bs1
;
2262 const char *name
= qdict_get_str(qdict
, "name");
2264 bs
= bdrv_snapshots();
2266 monitor_printf(mon
, "No block device supports snapshots\n");
2271 while ((bs1
= bdrv_next(bs1
))) {
2272 if (bdrv_can_snapshot(bs1
)) {
2273 ret
= bdrv_snapshot_delete(bs1
, name
);
2275 if (ret
== -ENOTSUP
)
2277 "Snapshots not supported on device '%s'\n",
2278 bdrv_get_device_name(bs1
));
2280 monitor_printf(mon
, "Error %d while deleting snapshot on "
2281 "'%s'\n", ret
, bdrv_get_device_name(bs1
));
2287 void do_info_snapshots(Monitor
*mon
)
2289 BlockDriverState
*bs
, *bs1
;
2290 QEMUSnapshotInfo
*sn_tab
, *sn
, s
, *sn_info
= &s
;
2291 int nb_sns
, i
, ret
, available
;
2293 int *available_snapshots
;
2296 bs
= bdrv_snapshots();
2298 monitor_printf(mon
, "No available block device supports snapshots\n");
2302 nb_sns
= bdrv_snapshot_list(bs
, &sn_tab
);
2304 monitor_printf(mon
, "bdrv_snapshot_list: error %d\n", nb_sns
);
2309 monitor_printf(mon
, "There is no snapshot available.\n");
2313 available_snapshots
= g_malloc0(sizeof(int) * nb_sns
);
2315 for (i
= 0; i
< nb_sns
; i
++) {
2320 while ((bs1
= bdrv_next(bs1
))) {
2321 if (bdrv_can_snapshot(bs1
) && bs1
!= bs
) {
2322 ret
= bdrv_snapshot_find(bs1
, sn_info
, sn
->id_str
);
2331 available_snapshots
[total
] = i
;
2337 monitor_printf(mon
, "%s\n", bdrv_snapshot_dump(buf
, sizeof(buf
), NULL
));
2338 for (i
= 0; i
< total
; i
++) {
2339 sn
= &sn_tab
[available_snapshots
[i
]];
2340 monitor_printf(mon
, "%s\n", bdrv_snapshot_dump(buf
, sizeof(buf
), sn
));
2343 monitor_printf(mon
, "There is no suitable snapshot available\n");
2347 g_free(available_snapshots
);
2351 void vmstate_register_ram(MemoryRegion
*mr
, DeviceState
*dev
)
2353 qemu_ram_set_idstr(memory_region_get_ram_addr(mr
) & TARGET_PAGE_MASK
,
2354 memory_region_name(mr
), dev
);
2357 void vmstate_unregister_ram(MemoryRegion
*mr
, DeviceState
*dev
)
2359 /* Nothing do to while the implementation is in RAMBlock */
2362 void vmstate_register_ram_global(MemoryRegion
*mr
)
2364 vmstate_register_ram(mr
, NULL
);
2373 nzrun = length byte...
2375 length = uleb128 encoded integer
2377 int xbzrle_encode_buffer(uint8_t *old_buf
, uint8_t *new_buf
, int slen
,
2378 uint8_t *dst
, int dlen
)
2380 uint32_t zrun_len
= 0, nzrun_len
= 0;
2383 uint8_t *nzrun_start
= NULL
;
2385 g_assert(!(((uintptr_t)old_buf
| (uintptr_t)new_buf
| slen
) %
2394 /* not aligned to sizeof(long) */
2395 res
= (slen
- i
) % sizeof(long);
2396 while (res
&& old_buf
[i
] == new_buf
[i
]) {
2402 /* word at a time for speed */
2405 (*(long *)(old_buf
+ i
)) == (*(long *)(new_buf
+ i
))) {
2407 zrun_len
+= sizeof(long);
2410 /* go over the rest */
2411 while (i
< slen
&& old_buf
[i
] == new_buf
[i
]) {
2417 /* buffer unchanged */
2418 if (zrun_len
== slen
) {
2422 /* skip last zero run */
2427 d
+= uleb128_encode_small(dst
+ d
, zrun_len
);
2430 nzrun_start
= new_buf
+ i
;
2436 /* not aligned to sizeof(long) */
2437 res
= (slen
- i
) % sizeof(long);
2438 while (res
&& old_buf
[i
] != new_buf
[i
]) {
2444 /* word at a time for speed, use of 32-bit long okay */
2446 /* truncation to 32-bit long okay */
2447 long mask
= (long)0x0101010101010101ULL
;
2449 xor = *(long *)(old_buf
+ i
) ^ *(long *)(new_buf
+ i
);
2450 if ((xor - mask
) & ~xor & (mask
<< 7)) {
2451 /* found the end of an nzrun within the current long */
2452 while (old_buf
[i
] != new_buf
[i
]) {
2459 nzrun_len
+= sizeof(long);
2464 d
+= uleb128_encode_small(dst
+ d
, nzrun_len
);
2466 if (d
+ nzrun_len
> dlen
) {
2469 memcpy(dst
+ d
, nzrun_start
, nzrun_len
);
2477 int xbzrle_decode_buffer(uint8_t *src
, int slen
, uint8_t *dst
, int dlen
)
2486 if ((slen
- i
) < 2) {
2490 ret
= uleb128_decode_small(src
+ i
, &count
);
2491 if (ret
< 0 || (i
&& !count
)) {
2503 if ((slen
- i
) < 2) {
2507 ret
= uleb128_decode_small(src
+ i
, &count
);
2508 if (ret
< 0 || !count
) {
2514 if (d
+ count
> dlen
|| i
+ count
> slen
) {
2518 memcpy(dst
+ d
, src
+ i
, count
);