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
25 #include "config-host.h"
26 #include "qemu-common.h"
30 #include "monitor/monitor.h"
31 #include "sysemu/sysemu.h"
32 #include "qemu/timer.h"
33 #include "audio/audio.h"
34 #include "migration/migration.h"
35 #include "qemu/sockets.h"
36 #include "qemu/queue.h"
37 #include "sysemu/cpus.h"
38 #include "exec/memory.h"
39 #include "qmp-commands.h"
41 #include "qemu/bitops.h"
44 #define SELF_ANNOUNCE_ROUNDS 5
47 #define ETH_P_RARP 0x8035
49 #define ARP_HTYPE_ETH 0x0001
50 #define ARP_PTYPE_IP 0x0800
51 #define ARP_OP_REQUEST_REV 0x3
53 static int announce_self_create(uint8_t *buf,
56 /* Ethernet header. */
57 memset(buf, 0xff, 6); /* destination MAC addr */
58 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
59 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
62 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
63 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
64 *(buf + 18) = 6; /* hardware addr length (ethernet) */
65 *(buf + 19) = 4; /* protocol addr length (IPv4) */
66 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
67 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
68 memset(buf + 28, 0x00, 4); /* source protocol addr */
69 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
70 memset(buf + 38, 0x00, 4); /* target protocol addr */
72 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
73 memset(buf + 42, 0x00, 18);
75 return 60; /* len (FCS will be added by hardware) */
78 static void qemu_announce_self_iter(NICState *nic, void *opaque)
83 len = announce_self_create(buf, nic->conf->macaddr.a);
85 qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
89 static void qemu_announce_self_once(void *opaque)
91 static int count = SELF_ANNOUNCE_ROUNDS;
92 QEMUTimer *timer = *(QEMUTimer **)opaque;
94 qemu_foreach_nic(qemu_announce_self_iter, NULL);
97 /* delay 50ms, 150ms, 250ms, ... */
98 qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
99 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
101 qemu_del_timer(timer);
102 qemu_free_timer(timer);
106 void qemu_announce_self(void)
108 static QEMUTimer *timer;
109 timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
110 qemu_announce_self_once(&timer);
113 /***********************************************************/
114 /* savevm/loadvm support */
116 #define IO_BUF_SIZE 32768
117 #define MAX_IOV_SIZE MIN(IOV_MAX, 64)
120 const QEMUFileOps *ops;
127 int64_t pos; /* start of buffer when writing, end of buffer
130 int buf_size; /* 0 when writing */
131 uint8_t buf[IO_BUF_SIZE];
133 struct iovec iov[MAX_IOV_SIZE];
139 typedef struct QEMUFileStdio
145 typedef struct QEMUFileSocket
156 static void fd_coroutine_enter(void *opaque)
158 FDYieldUntilData *data = opaque;
159 qemu_set_fd_handler(data->fd, NULL, NULL, NULL);
160 qemu_coroutine_enter(data->co, NULL);
164 * Yield until a file descriptor becomes readable
166 * Note that this function clobbers the handlers for the file descriptor.
168 static void coroutine_fn yield_until_fd_readable(int fd)
170 FDYieldUntilData data;
172 assert(qemu_in_coroutine());
173 data.co = qemu_coroutine_self();
175 qemu_set_fd_handler(fd, fd_coroutine_enter, NULL, &data);
176 qemu_coroutine_yield();
179 static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt)
181 QEMUFileSocket *s = opaque;
183 ssize_t size = iov_size(iov, iovcnt);
185 len = iov_send(s->fd, iov, iovcnt, 0, size);
187 len = -socket_error();
192 static int socket_get_fd(void *opaque)
194 QEMUFileSocket *s = opaque;
199 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
201 QEMUFileSocket *s = opaque;
205 len = qemu_recv(s->fd, buf, size, 0);
209 if (socket_error() == EAGAIN) {
210 yield_until_fd_readable(s->fd);
211 } else if (socket_error() != EINTR) {
217 len = -socket_error();
222 static int socket_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
224 QEMUFileSocket *s = opaque;
227 len = qemu_send_full(s->fd, buf, size, 0);
229 len = -socket_error();
234 static int socket_close(void *opaque)
236 QEMUFileSocket *s = opaque;
242 static int stdio_get_fd(void *opaque)
244 QEMUFileStdio *s = opaque;
246 return fileno(s->stdio_file);
249 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
251 QEMUFileStdio *s = opaque;
252 return fwrite(buf, 1, size, s->stdio_file);
255 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
257 QEMUFileStdio *s = opaque;
258 FILE *fp = s->stdio_file;
263 bytes = fread(buf, 1, size, fp);
264 if (bytes != 0 || !ferror(fp)) {
267 if (errno == EAGAIN) {
268 yield_until_fd_readable(fileno(fp));
269 } else if (errno != EINTR) {
276 static int stdio_pclose(void *opaque)
278 QEMUFileStdio *s = opaque;
280 ret = pclose(s->stdio_file);
283 } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
284 /* close succeeded, but non-zero exit code: */
285 ret = -EIO; /* fake errno value */
291 static int stdio_fclose(void *opaque)
293 QEMUFileStdio *s = opaque;
296 if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
297 int fd = fileno(s->stdio_file);
300 ret = fstat(fd, &st);
301 if (ret == 0 && S_ISREG(st.st_mode)) {
303 * If the file handle is a regular file make sure the
304 * data is flushed to disk before signaling success.
313 if (fclose(s->stdio_file) == EOF) {
320 static const QEMUFileOps stdio_pipe_read_ops = {
321 .get_fd = stdio_get_fd,
322 .get_buffer = stdio_get_buffer,
323 .close = stdio_pclose
326 static const QEMUFileOps stdio_pipe_write_ops = {
327 .get_fd = stdio_get_fd,
328 .put_buffer = stdio_put_buffer,
329 .close = stdio_pclose
332 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
337 stdio_file = popen(command, mode);
338 if (stdio_file == NULL) {
342 if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
343 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
347 s = g_malloc0(sizeof(QEMUFileStdio));
349 s->stdio_file = stdio_file;
352 s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
354 s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
359 static const QEMUFileOps stdio_file_read_ops = {
360 .get_fd = stdio_get_fd,
361 .get_buffer = stdio_get_buffer,
362 .close = stdio_fclose
365 static const QEMUFileOps stdio_file_write_ops = {
366 .get_fd = stdio_get_fd,
367 .put_buffer = stdio_put_buffer,
368 .close = stdio_fclose
371 QEMUFile *qemu_fdopen(int fd, const char *mode)
376 (mode[0] != 'r' && mode[0] != 'w') ||
377 mode[1] != 'b' || mode[2] != 0) {
378 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
382 s = g_malloc0(sizeof(QEMUFileStdio));
383 s->stdio_file = fdopen(fd, mode);
388 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
390 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
399 static const QEMUFileOps socket_read_ops = {
400 .get_fd = socket_get_fd,
401 .get_buffer = socket_get_buffer,
402 .close = socket_close
405 static const QEMUFileOps socket_write_ops = {
406 .get_fd = socket_get_fd,
407 .put_buffer = socket_put_buffer,
408 .writev_buffer = socket_writev_buffer,
409 .close = socket_close
412 QEMUFile *qemu_fopen_socket(int fd, const char *mode)
414 QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
417 (mode[0] != 'r' && mode[0] != 'w') ||
418 mode[1] != 'b' || mode[2] != 0) {
419 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
424 if (mode[0] == 'w') {
425 qemu_set_block(s->fd);
426 s->file = qemu_fopen_ops(s, &socket_write_ops);
428 s->file = qemu_fopen_ops(s, &socket_read_ops);
433 QEMUFile *qemu_fopen(const char *filename, const char *mode)
438 (mode[0] != 'r' && mode[0] != 'w') ||
439 mode[1] != 'b' || mode[2] != 0) {
440 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
444 s = g_malloc0(sizeof(QEMUFileStdio));
446 s->stdio_file = fopen(filename, mode);
451 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
453 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
461 static int block_put_buffer(void *opaque, const uint8_t *buf,
462 int64_t pos, int size)
464 bdrv_save_vmstate(opaque, buf, pos, size);
468 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
470 return bdrv_load_vmstate(opaque, buf, pos, size);
473 static int bdrv_fclose(void *opaque)
475 return bdrv_flush(opaque);
478 static const QEMUFileOps bdrv_read_ops = {
479 .get_buffer = block_get_buffer,
483 static const QEMUFileOps bdrv_write_ops = {
484 .put_buffer = block_put_buffer,
488 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
491 return qemu_fopen_ops(bs, &bdrv_write_ops);
492 return qemu_fopen_ops(bs, &bdrv_read_ops);
495 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
499 f = g_malloc0(sizeof(QEMUFile));
507 int qemu_file_get_error(QEMUFile *f)
509 return f->last_error;
512 static void qemu_file_set_error(QEMUFile *f, int ret)
514 if (f->last_error == 0) {
520 * Flushes QEMUFile buffer
522 * If there is writev_buffer QEMUFileOps it uses it otherwise uses
525 static void qemu_fflush(QEMUFile *f)
530 if (!f->ops->writev_buffer && !f->ops->put_buffer) {
534 if (f->is_write && f->iovcnt > 0) {
535 if (f->ops->writev_buffer) {
536 ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt);
541 for (i = 0; i < f->iovcnt && ret >= 0; i++) {
542 ret = f->ops->put_buffer(f->opaque, f->iov[i].iov_base, f->pos,
553 qemu_file_set_error(f, ret);
557 static void qemu_fill_buffer(QEMUFile *f)
562 if (!f->ops->get_buffer)
568 pending = f->buf_size - f->buf_index;
570 memmove(f->buf, f->buf + f->buf_index, pending);
573 f->buf_size = pending;
575 len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
576 IO_BUF_SIZE - pending);
580 } else if (len == 0) {
581 qemu_file_set_error(f, -EIO);
582 } else if (len != -EAGAIN)
583 qemu_file_set_error(f, len);
586 int qemu_get_fd(QEMUFile *f)
588 if (f->ops->get_fd) {
589 return f->ops->get_fd(f->opaque);
596 * Returns negative error value if any error happened on previous operations or
597 * while closing the file. Returns 0 or positive number on success.
599 * The meaning of return value on success depends on the specific backend
602 int qemu_fclose(QEMUFile *f)
606 ret = qemu_file_get_error(f);
609 int ret2 = f->ops->close(f->opaque);
614 /* If any error was spotted before closing, we should report it
615 * instead of the close() return value.
624 static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
626 /* check for adjacent buffer and coalesce them */
627 if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
628 f->iov[f->iovcnt - 1].iov_len) {
629 f->iov[f->iovcnt - 1].iov_len += size;
631 f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
632 f->iov[f->iovcnt++].iov_len = size;
636 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
642 if (f->is_write == 0 && f->buf_index > 0) {
644 "Attempted to write to buffer while read buffer is not empty\n");
648 add_to_iovec(f, buf, size);
651 f->bytes_xfer += size;
653 if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
658 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
666 if (f->is_write == 0 && f->buf_index > 0) {
668 "Attempted to write to buffer while read buffer is not empty\n");
673 l = IO_BUF_SIZE - f->buf_index;
676 memcpy(f->buf + f->buf_index, buf, l);
679 qemu_put_buffer_async(f, f->buf + (f->buf_index - l), l);
680 if (qemu_file_get_error(f)) {
688 void qemu_put_byte(QEMUFile *f, int v)
694 if (f->is_write == 0 && f->buf_index > 0) {
696 "Attempted to write to buffer while read buffer is not empty\n");
700 f->buf[f->buf_index++] = v;
704 add_to_iovec(f, f->buf + (f->buf_index - 1), 1);
706 if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
711 static void qemu_file_skip(QEMUFile *f, int size)
713 if (f->buf_index + size <= f->buf_size) {
714 f->buf_index += size;
718 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
727 index = f->buf_index + offset;
728 pending = f->buf_size - index;
729 if (pending < size) {
731 index = f->buf_index + offset;
732 pending = f->buf_size - index;
738 if (size > pending) {
742 memcpy(buf, f->buf + index, size);
746 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
751 while (pending > 0) {
754 res = qemu_peek_buffer(f, buf, pending, 0);
758 qemu_file_skip(f, res);
766 static int qemu_peek_byte(QEMUFile *f, int offset)
768 int index = f->buf_index + offset;
774 if (index >= f->buf_size) {
776 index = f->buf_index + offset;
777 if (index >= f->buf_size) {
781 return f->buf[index];
784 int qemu_get_byte(QEMUFile *f)
788 result = qemu_peek_byte(f, 0);
789 qemu_file_skip(f, 1);
793 int64_t qemu_ftell(QEMUFile *f)
799 int qemu_file_rate_limit(QEMUFile *f)
801 if (qemu_file_get_error(f)) {
804 if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
810 int64_t qemu_file_get_rate_limit(QEMUFile *f)
812 return f->xfer_limit;
815 void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
817 f->xfer_limit = limit;
820 void qemu_file_reset_rate_limit(QEMUFile *f)
825 void qemu_put_be16(QEMUFile *f, unsigned int v)
827 qemu_put_byte(f, v >> 8);
831 void qemu_put_be32(QEMUFile *f, unsigned int v)
833 qemu_put_byte(f, v >> 24);
834 qemu_put_byte(f, v >> 16);
835 qemu_put_byte(f, v >> 8);
839 void qemu_put_be64(QEMUFile *f, uint64_t v)
841 qemu_put_be32(f, v >> 32);
845 unsigned int qemu_get_be16(QEMUFile *f)
848 v = qemu_get_byte(f) << 8;
849 v |= qemu_get_byte(f);
853 unsigned int qemu_get_be32(QEMUFile *f)
856 v = qemu_get_byte(f) << 24;
857 v |= qemu_get_byte(f) << 16;
858 v |= qemu_get_byte(f) << 8;
859 v |= qemu_get_byte(f);
863 uint64_t qemu_get_be64(QEMUFile *f)
866 v = (uint64_t)qemu_get_be32(f) << 32;
867 v |= qemu_get_be32(f);
874 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
876 uint64_t expire_time;
878 expire_time = qemu_timer_expire_time_ns(ts);
879 qemu_put_be64(f, expire_time);
882 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
884 uint64_t expire_time;
886 expire_time = qemu_get_be64(f);
887 if (expire_time != -1) {
888 qemu_mod_timer_ns(ts, expire_time);
897 static int get_bool(QEMUFile *f, void *pv, size_t size)
900 *v = qemu_get_byte(f);
904 static void put_bool(QEMUFile *f, void *pv, size_t size)
907 qemu_put_byte(f, *v);
910 const VMStateInfo vmstate_info_bool = {
918 static int get_int8(QEMUFile *f, void *pv, size_t size)
925 static void put_int8(QEMUFile *f, void *pv, size_t size)
931 const VMStateInfo vmstate_info_int8 = {
939 static int get_int16(QEMUFile *f, void *pv, size_t size)
942 qemu_get_sbe16s(f, v);
946 static void put_int16(QEMUFile *f, void *pv, size_t size)
949 qemu_put_sbe16s(f, v);
952 const VMStateInfo vmstate_info_int16 = {
960 static int get_int32(QEMUFile *f, void *pv, size_t size)
963 qemu_get_sbe32s(f, v);
967 static void put_int32(QEMUFile *f, void *pv, size_t size)
970 qemu_put_sbe32s(f, v);
973 const VMStateInfo vmstate_info_int32 = {
979 /* 32 bit int. See that the received value is the same than the one
982 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
986 qemu_get_sbe32s(f, &v2);
993 const VMStateInfo vmstate_info_int32_equal = {
994 .name = "int32 equal",
995 .get = get_int32_equal,
999 /* 32 bit int. See that the received value is the less or the same
1000 than the one in the field */
1002 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
1006 qemu_get_sbe32s(f, &new);
1013 const VMStateInfo vmstate_info_int32_le = {
1014 .name = "int32 equal",
1015 .get = get_int32_le,
1021 static int get_int64(QEMUFile *f, void *pv, size_t size)
1024 qemu_get_sbe64s(f, v);
1028 static void put_int64(QEMUFile *f, void *pv, size_t size)
1031 qemu_put_sbe64s(f, v);
1034 const VMStateInfo vmstate_info_int64 = {
1040 /* 8 bit unsigned int */
1042 static int get_uint8(QEMUFile *f, void *pv, size_t size)
1049 static void put_uint8(QEMUFile *f, void *pv, size_t size)
1055 const VMStateInfo vmstate_info_uint8 = {
1061 /* 16 bit unsigned int */
1063 static int get_uint16(QEMUFile *f, void *pv, size_t size)
1066 qemu_get_be16s(f, v);
1070 static void put_uint16(QEMUFile *f, void *pv, size_t size)
1073 qemu_put_be16s(f, v);
1076 const VMStateInfo vmstate_info_uint16 = {
1082 /* 32 bit unsigned int */
1084 static int get_uint32(QEMUFile *f, void *pv, size_t size)
1087 qemu_get_be32s(f, v);
1091 static void put_uint32(QEMUFile *f, void *pv, size_t size)
1094 qemu_put_be32s(f, v);
1097 const VMStateInfo vmstate_info_uint32 = {
1103 /* 32 bit uint. See that the received value is the same than the one
1106 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1110 qemu_get_be32s(f, &v2);
1118 const VMStateInfo vmstate_info_uint32_equal = {
1119 .name = "uint32 equal",
1120 .get = get_uint32_equal,
1124 /* 64 bit unsigned int */
1126 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1129 qemu_get_be64s(f, v);
1133 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1136 qemu_put_be64s(f, v);
1139 const VMStateInfo vmstate_info_uint64 = {
1145 /* 64 bit unsigned int. See that the received value is the same than the one
1148 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
1152 qemu_get_be64s(f, &v2);
1160 const VMStateInfo vmstate_info_uint64_equal = {
1161 .name = "int64 equal",
1162 .get = get_uint64_equal,
1166 /* 8 bit int. See that the received value is the same than the one
1169 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1173 qemu_get_8s(f, &v2);
1180 const VMStateInfo vmstate_info_uint8_equal = {
1181 .name = "uint8 equal",
1182 .get = get_uint8_equal,
1186 /* 16 bit unsigned int int. See that the received value is the same than the one
1189 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1193 qemu_get_be16s(f, &v2);
1200 const VMStateInfo vmstate_info_uint16_equal = {
1201 .name = "uint16 equal",
1202 .get = get_uint16_equal,
1206 /* floating point */
1208 static int get_float64(QEMUFile *f, void *pv, size_t size)
1212 *v = make_float64(qemu_get_be64(f));
1216 static void put_float64(QEMUFile *f, void *pv, size_t size)
1220 qemu_put_be64(f, float64_val(*v));
1223 const VMStateInfo vmstate_info_float64 = {
1231 static int get_timer(QEMUFile *f, void *pv, size_t size)
1234 qemu_get_timer(f, v);
1238 static void put_timer(QEMUFile *f, void *pv, size_t size)
1241 qemu_put_timer(f, v);
1244 const VMStateInfo vmstate_info_timer = {
1250 /* uint8_t buffers */
1252 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1255 qemu_get_buffer(f, v, size);
1259 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1262 qemu_put_buffer(f, v, size);
1265 const VMStateInfo vmstate_info_buffer = {
1271 /* unused buffers: space that was used for some fields that are
1272 not useful anymore */
1274 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1280 block_len = MIN(sizeof(buf), size);
1282 qemu_get_buffer(f, buf, block_len);
1287 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1289 static const uint8_t buf[1024];
1293 block_len = MIN(sizeof(buf), size);
1295 qemu_put_buffer(f, buf, block_len);
1299 const VMStateInfo vmstate_info_unused_buffer = {
1300 .name = "unused_buffer",
1301 .get = get_unused_buffer,
1302 .put = put_unused_buffer,
1305 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1306 * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1307 * bit words with the bits in big endian order. The in-memory format
1308 * is an array of 'unsigned long', which may be either 32 or 64 bits.
1310 /* This is the number of 64 bit words sent over the wire */
1311 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1312 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1314 unsigned long *bmp = pv;
1316 for (i = 0; i < BITS_TO_U64S(size); i++) {
1317 uint64_t w = qemu_get_be64(f);
1319 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1320 bmp[idx++] = w >> 32;
1326 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1328 unsigned long *bmp = pv;
1330 for (i = 0; i < BITS_TO_U64S(size); i++) {
1331 uint64_t w = bmp[idx++];
1332 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1333 w |= ((uint64_t)bmp[idx++]) << 32;
1335 qemu_put_be64(f, w);
1339 const VMStateInfo vmstate_info_bitmap = {
1345 typedef struct CompatEntry {
1350 typedef struct SaveStateEntry {
1351 QTAILQ_ENTRY(SaveStateEntry) entry;
1357 SaveVMHandlers *ops;
1358 const VMStateDescription *vmsd;
1360 CompatEntry *compat;
1366 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1367 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1368 static int global_section_id;
1370 static int calculate_new_instance_id(const char *idstr)
1373 int instance_id = 0;
1375 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1376 if (strcmp(idstr, se->idstr) == 0
1377 && instance_id <= se->instance_id) {
1378 instance_id = se->instance_id + 1;
1384 static int calculate_compat_instance_id(const char *idstr)
1387 int instance_id = 0;
1389 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1393 if (strcmp(idstr, se->compat->idstr) == 0
1394 && instance_id <= se->compat->instance_id) {
1395 instance_id = se->compat->instance_id + 1;
1401 /* TODO: Individual devices generally have very little idea about the rest
1402 of the system, so instance_id should be removed/replaced.
1403 Meanwhile pass -1 as instance_id if you do not already have a clearly
1404 distinguishing id for all instances of your device class. */
1405 int register_savevm_live(DeviceState *dev,
1409 SaveVMHandlers *ops,
1414 se = g_malloc0(sizeof(SaveStateEntry));
1415 se->version_id = version_id;
1416 se->section_id = global_section_id++;
1418 se->opaque = opaque;
1421 /* if this is a live_savem then set is_ram */
1422 if (ops->save_live_setup != NULL) {
1427 char *id = qdev_get_dev_path(dev);
1429 pstrcpy(se->idstr, sizeof(se->idstr), id);
1430 pstrcat(se->idstr, sizeof(se->idstr), "/");
1433 se->compat = g_malloc0(sizeof(CompatEntry));
1434 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1435 se->compat->instance_id = instance_id == -1 ?
1436 calculate_compat_instance_id(idstr) : instance_id;
1440 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1442 if (instance_id == -1) {
1443 se->instance_id = calculate_new_instance_id(se->idstr);
1445 se->instance_id = instance_id;
1447 assert(!se->compat || se->instance_id == 0);
1448 /* add at the end of list */
1449 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1453 int register_savevm(DeviceState *dev,
1457 SaveStateHandler *save_state,
1458 LoadStateHandler *load_state,
1461 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1462 ops->save_state = save_state;
1463 ops->load_state = load_state;
1464 return register_savevm_live(dev, idstr, instance_id, version_id,
1468 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1470 SaveStateEntry *se, *new_se;
1474 char *path = qdev_get_dev_path(dev);
1476 pstrcpy(id, sizeof(id), path);
1477 pstrcat(id, sizeof(id), "/");
1481 pstrcat(id, sizeof(id), idstr);
1483 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1484 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1485 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1495 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1496 const VMStateDescription *vmsd,
1497 void *opaque, int alias_id,
1498 int required_for_version)
1502 /* If this triggers, alias support can be dropped for the vmsd. */
1503 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1505 se = g_malloc0(sizeof(SaveStateEntry));
1506 se->version_id = vmsd->version_id;
1507 se->section_id = global_section_id++;
1508 se->opaque = opaque;
1510 se->alias_id = alias_id;
1511 se->no_migrate = vmsd->unmigratable;
1514 char *id = qdev_get_dev_path(dev);
1516 pstrcpy(se->idstr, sizeof(se->idstr), id);
1517 pstrcat(se->idstr, sizeof(se->idstr), "/");
1520 se->compat = g_malloc0(sizeof(CompatEntry));
1521 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1522 se->compat->instance_id = instance_id == -1 ?
1523 calculate_compat_instance_id(vmsd->name) : instance_id;
1527 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1529 if (instance_id == -1) {
1530 se->instance_id = calculate_new_instance_id(se->idstr);
1532 se->instance_id = instance_id;
1534 assert(!se->compat || se->instance_id == 0);
1535 /* add at the end of list */
1536 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1540 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1543 SaveStateEntry *se, *new_se;
1545 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1546 if (se->vmsd == vmsd && se->opaque == opaque) {
1547 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1556 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1558 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1561 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1562 void *opaque, int version_id)
1564 VMStateField *field = vmsd->fields;
1567 if (version_id > vmsd->version_id) {
1570 if (version_id < vmsd->minimum_version_id_old) {
1573 if (version_id < vmsd->minimum_version_id) {
1574 return vmsd->load_state_old(f, opaque, version_id);
1576 if (vmsd->pre_load) {
1577 int ret = vmsd->pre_load(opaque);
1581 while(field->name) {
1582 if ((field->field_exists &&
1583 field->field_exists(opaque, version_id)) ||
1584 (!field->field_exists &&
1585 field->version_id <= version_id)) {
1586 void *base_addr = opaque + field->offset;
1588 int size = field->size;
1590 if (field->flags & VMS_VBUFFER) {
1591 size = *(int32_t *)(opaque+field->size_offset);
1592 if (field->flags & VMS_MULTIPLY) {
1593 size *= field->size;
1596 if (field->flags & VMS_ARRAY) {
1597 n_elems = field->num;
1598 } else if (field->flags & VMS_VARRAY_INT32) {
1599 n_elems = *(int32_t *)(opaque+field->num_offset);
1600 } else if (field->flags & VMS_VARRAY_UINT32) {
1601 n_elems = *(uint32_t *)(opaque+field->num_offset);
1602 } else if (field->flags & VMS_VARRAY_UINT16) {
1603 n_elems = *(uint16_t *)(opaque+field->num_offset);
1604 } else if (field->flags & VMS_VARRAY_UINT8) {
1605 n_elems = *(uint8_t *)(opaque+field->num_offset);
1607 if (field->flags & VMS_POINTER) {
1608 base_addr = *(void **)base_addr + field->start;
1610 for (i = 0; i < n_elems; i++) {
1611 void *addr = base_addr + size * i;
1613 if (field->flags & VMS_ARRAY_OF_POINTER) {
1614 addr = *(void **)addr;
1616 if (field->flags & VMS_STRUCT) {
1617 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1619 ret = field->info->get(f, addr, size);
1629 ret = vmstate_subsection_load(f, vmsd, opaque);
1633 if (vmsd->post_load) {
1634 return vmsd->post_load(opaque, version_id);
1639 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1642 VMStateField *field = vmsd->fields;
1644 if (vmsd->pre_save) {
1645 vmsd->pre_save(opaque);
1647 while(field->name) {
1648 if (!field->field_exists ||
1649 field->field_exists(opaque, vmsd->version_id)) {
1650 void *base_addr = opaque + field->offset;
1652 int size = field->size;
1654 if (field->flags & VMS_VBUFFER) {
1655 size = *(int32_t *)(opaque+field->size_offset);
1656 if (field->flags & VMS_MULTIPLY) {
1657 size *= field->size;
1660 if (field->flags & VMS_ARRAY) {
1661 n_elems = field->num;
1662 } else if (field->flags & VMS_VARRAY_INT32) {
1663 n_elems = *(int32_t *)(opaque+field->num_offset);
1664 } else if (field->flags & VMS_VARRAY_UINT32) {
1665 n_elems = *(uint32_t *)(opaque+field->num_offset);
1666 } else if (field->flags & VMS_VARRAY_UINT16) {
1667 n_elems = *(uint16_t *)(opaque+field->num_offset);
1668 } else if (field->flags & VMS_VARRAY_UINT8) {
1669 n_elems = *(uint8_t *)(opaque+field->num_offset);
1671 if (field->flags & VMS_POINTER) {
1672 base_addr = *(void **)base_addr + field->start;
1674 for (i = 0; i < n_elems; i++) {
1675 void *addr = base_addr + size * i;
1677 if (field->flags & VMS_ARRAY_OF_POINTER) {
1678 addr = *(void **)addr;
1680 if (field->flags & VMS_STRUCT) {
1681 vmstate_save_state(f, field->vmsd, addr);
1683 field->info->put(f, addr, size);
1689 vmstate_subsection_save(f, vmsd, opaque);
1692 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1694 if (!se->vmsd) { /* Old style */
1695 return se->ops->load_state(f, se->opaque, version_id);
1697 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1700 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1702 if (!se->vmsd) { /* Old style */
1703 se->ops->save_state(f, se->opaque);
1706 vmstate_save_state(f,se->vmsd, se->opaque);
1709 #define QEMU_VM_FILE_MAGIC 0x5145564d
1710 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1711 #define QEMU_VM_FILE_VERSION 0x00000003
1713 #define QEMU_VM_EOF 0x00
1714 #define QEMU_VM_SECTION_START 0x01
1715 #define QEMU_VM_SECTION_PART 0x02
1716 #define QEMU_VM_SECTION_END 0x03
1717 #define QEMU_VM_SECTION_FULL 0x04
1718 #define QEMU_VM_SUBSECTION 0x05
1720 bool qemu_savevm_state_blocked(Error **errp)
1724 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1725 if (se->no_migrate) {
1726 error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1733 void qemu_savevm_state_begin(QEMUFile *f,
1734 const MigrationParams *params)
1739 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1740 if (!se->ops || !se->ops->set_params) {
1743 se->ops->set_params(params, se->opaque);
1746 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1747 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1749 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1752 if (!se->ops || !se->ops->save_live_setup) {
1755 if (se->ops && se->ops->is_active) {
1756 if (!se->ops->is_active(se->opaque)) {
1761 qemu_put_byte(f, QEMU_VM_SECTION_START);
1762 qemu_put_be32(f, se->section_id);
1765 len = strlen(se->idstr);
1766 qemu_put_byte(f, len);
1767 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1769 qemu_put_be32(f, se->instance_id);
1770 qemu_put_be32(f, se->version_id);
1772 ret = se->ops->save_live_setup(f, se->opaque);
1774 qemu_file_set_error(f, ret);
1781 * this function has three return values:
1782 * negative: there was one error, and we have -errno.
1783 * 0 : We haven't finished, caller have to go again
1784 * 1 : We have finished, we can go to complete phase
1786 int qemu_savevm_state_iterate(QEMUFile *f)
1791 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1792 if (!se->ops || !se->ops->save_live_iterate) {
1795 if (se->ops && se->ops->is_active) {
1796 if (!se->ops->is_active(se->opaque)) {
1800 if (qemu_file_rate_limit(f)) {
1803 trace_savevm_section_start();
1805 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1806 qemu_put_be32(f, se->section_id);
1808 ret = se->ops->save_live_iterate(f, se->opaque);
1809 trace_savevm_section_end(se->section_id);
1812 qemu_file_set_error(f, ret);
1815 /* Do not proceed to the next vmstate before this one reported
1816 completion of the current stage. This serializes the migration
1817 and reduces the probability that a faster changing state is
1818 synchronized over and over again. */
1825 void qemu_savevm_state_complete(QEMUFile *f)
1830 cpu_synchronize_all_states();
1832 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1833 if (!se->ops || !se->ops->save_live_complete) {
1836 if (se->ops && se->ops->is_active) {
1837 if (!se->ops->is_active(se->opaque)) {
1841 trace_savevm_section_start();
1843 qemu_put_byte(f, QEMU_VM_SECTION_END);
1844 qemu_put_be32(f, se->section_id);
1846 ret = se->ops->save_live_complete(f, se->opaque);
1847 trace_savevm_section_end(se->section_id);
1849 qemu_file_set_error(f, ret);
1854 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1857 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1860 trace_savevm_section_start();
1862 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1863 qemu_put_be32(f, se->section_id);
1866 len = strlen(se->idstr);
1867 qemu_put_byte(f, len);
1868 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1870 qemu_put_be32(f, se->instance_id);
1871 qemu_put_be32(f, se->version_id);
1873 vmstate_save(f, se);
1874 trace_savevm_section_end(se->section_id);
1877 qemu_put_byte(f, QEMU_VM_EOF);
1881 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
1886 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1887 if (!se->ops || !se->ops->save_live_pending) {
1890 if (se->ops && se->ops->is_active) {
1891 if (!se->ops->is_active(se->opaque)) {
1895 ret += se->ops->save_live_pending(f, se->opaque, max_size);
1900 void qemu_savevm_state_cancel(void)
1904 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1905 if (se->ops && se->ops->cancel) {
1906 se->ops->cancel(se->opaque);
1911 static int qemu_savevm_state(QEMUFile *f)
1914 MigrationParams params = {
1919 if (qemu_savevm_state_blocked(NULL)) {
1923 qemu_mutex_unlock_iothread();
1924 qemu_savevm_state_begin(f, ¶ms);
1925 qemu_mutex_lock_iothread();
1927 while (qemu_file_get_error(f) == 0) {
1928 if (qemu_savevm_state_iterate(f) > 0) {
1933 ret = qemu_file_get_error(f);
1935 qemu_savevm_state_complete(f);
1936 ret = qemu_file_get_error(f);
1939 qemu_savevm_state_cancel();
1944 static int qemu_save_device_state(QEMUFile *f)
1948 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1949 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1951 cpu_synchronize_all_states();
1953 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1959 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1964 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1965 qemu_put_be32(f, se->section_id);
1968 len = strlen(se->idstr);
1969 qemu_put_byte(f, len);
1970 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1972 qemu_put_be32(f, se->instance_id);
1973 qemu_put_be32(f, se->version_id);
1975 vmstate_save(f, se);
1978 qemu_put_byte(f, QEMU_VM_EOF);
1980 return qemu_file_get_error(f);
1983 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1987 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1988 if (!strcmp(se->idstr, idstr) &&
1989 (instance_id == se->instance_id ||
1990 instance_id == se->alias_id))
1992 /* Migrating from an older version? */
1993 if (strstr(se->idstr, idstr) && se->compat) {
1994 if (!strcmp(se->compat->idstr, idstr) &&
1995 (instance_id == se->compat->instance_id ||
1996 instance_id == se->alias_id))
2003 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
2005 while(sub && sub->needed) {
2006 if (strcmp(idstr, sub->vmsd->name) == 0) {
2014 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
2017 while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
2020 uint8_t version_id, len, size;
2021 const VMStateDescription *sub_vmsd;
2023 len = qemu_peek_byte(f, 1);
2024 if (len < strlen(vmsd->name) + 1) {
2025 /* subsection name has be be "section_name/a" */
2028 size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
2034 if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
2035 /* it don't have a valid subsection name */
2038 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
2039 if (sub_vmsd == NULL) {
2042 qemu_file_skip(f, 1); /* subsection */
2043 qemu_file_skip(f, 1); /* len */
2044 qemu_file_skip(f, len); /* idstr */
2045 version_id = qemu_get_be32(f);
2047 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
2055 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
2058 const VMStateSubsection *sub = vmsd->subsections;
2060 while (sub && sub->needed) {
2061 if (sub->needed(opaque)) {
2062 const VMStateDescription *vmsd = sub->vmsd;
2065 qemu_put_byte(f, QEMU_VM_SUBSECTION);
2066 len = strlen(vmsd->name);
2067 qemu_put_byte(f, len);
2068 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
2069 qemu_put_be32(f, vmsd->version_id);
2070 vmstate_save_state(f, vmsd, opaque);
2076 typedef struct LoadStateEntry {
2077 QLIST_ENTRY(LoadStateEntry) entry;
2083 int qemu_loadvm_state(QEMUFile *f)
2085 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
2086 QLIST_HEAD_INITIALIZER(loadvm_handlers);
2087 LoadStateEntry *le, *new_le;
2088 uint8_t section_type;
2092 if (qemu_savevm_state_blocked(NULL)) {
2096 v = qemu_get_be32(f);
2097 if (v != QEMU_VM_FILE_MAGIC)
2100 v = qemu_get_be32(f);
2101 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
2102 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
2105 if (v != QEMU_VM_FILE_VERSION)
2108 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
2109 uint32_t instance_id, version_id, section_id;
2114 switch (section_type) {
2115 case QEMU_VM_SECTION_START:
2116 case QEMU_VM_SECTION_FULL:
2117 /* Read section start */
2118 section_id = qemu_get_be32(f);
2119 len = qemu_get_byte(f);
2120 qemu_get_buffer(f, (uint8_t *)idstr, len);
2122 instance_id = qemu_get_be32(f);
2123 version_id = qemu_get_be32(f);
2125 /* Find savevm section */
2126 se = find_se(idstr, instance_id);
2128 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
2133 /* Validate version */
2134 if (version_id > se->version_id) {
2135 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
2136 version_id, idstr, se->version_id);
2142 le = g_malloc0(sizeof(*le));
2145 le->section_id = section_id;
2146 le->version_id = version_id;
2147 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
2149 ret = vmstate_load(f, le->se, le->version_id);
2151 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
2152 instance_id, idstr);
2156 case QEMU_VM_SECTION_PART:
2157 case QEMU_VM_SECTION_END:
2158 section_id = qemu_get_be32(f);
2160 QLIST_FOREACH(le, &loadvm_handlers, entry) {
2161 if (le->section_id == section_id) {
2166 fprintf(stderr, "Unknown savevm section %d\n", section_id);
2171 ret = vmstate_load(f, le->se, le->version_id);
2173 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2179 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2185 cpu_synchronize_all_post_init();
2190 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2191 QLIST_REMOVE(le, entry);
2196 ret = qemu_file_get_error(f);
2202 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
2205 QEMUSnapshotInfo *sn_tab, *sn;
2209 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2212 for(i = 0; i < nb_sns; i++) {
2214 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2225 * Deletes snapshots of a given name in all opened images.
2227 static int del_existing_snapshots(Monitor *mon, const char *name)
2229 BlockDriverState *bs;
2230 QEMUSnapshotInfo sn1, *snapshot = &sn1;
2234 while ((bs = bdrv_next(bs))) {
2235 if (bdrv_can_snapshot(bs) &&
2236 bdrv_snapshot_find(bs, snapshot, name) >= 0)
2238 ret = bdrv_snapshot_delete(bs, name);
2241 "Error while deleting snapshot on '%s'\n",
2242 bdrv_get_device_name(bs));
2251 void do_savevm(Monitor *mon, const QDict *qdict)
2253 BlockDriverState *bs, *bs1;
2254 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2257 int saved_vm_running;
2258 uint64_t vm_state_size;
2261 const char *name = qdict_get_try_str(qdict, "name");
2263 /* Verify if there is a device that doesn't support snapshots and is writable */
2265 while ((bs = bdrv_next(bs))) {
2267 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2271 if (!bdrv_can_snapshot(bs)) {
2272 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2273 bdrv_get_device_name(bs));
2278 bs = bdrv_snapshots();
2280 monitor_printf(mon, "No block device can accept snapshots\n");
2284 saved_vm_running = runstate_is_running();
2285 vm_stop(RUN_STATE_SAVE_VM);
2287 memset(sn, 0, sizeof(*sn));
2289 /* fill auxiliary fields */
2290 qemu_gettimeofday(&tv);
2291 sn->date_sec = tv.tv_sec;
2292 sn->date_nsec = tv.tv_usec * 1000;
2293 sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2296 ret = bdrv_snapshot_find(bs, old_sn, name);
2298 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2299 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2301 pstrcpy(sn->name, sizeof(sn->name), name);
2304 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2305 localtime_r((const time_t *)&tv.tv_sec, &tm);
2306 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2309 /* Delete old snapshots of the same name */
2310 if (name && del_existing_snapshots(mon, name) < 0) {
2314 /* save the VM state */
2315 f = qemu_fopen_bdrv(bs, 1);
2317 monitor_printf(mon, "Could not open VM state file\n");
2320 ret = qemu_savevm_state(f);
2321 vm_state_size = qemu_ftell(f);
2324 monitor_printf(mon, "Error %d while writing VM\n", ret);
2328 /* create the snapshots */
2331 while ((bs1 = bdrv_next(bs1))) {
2332 if (bdrv_can_snapshot(bs1)) {
2333 /* Write VM state size only to the image that contains the state */
2334 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2335 ret = bdrv_snapshot_create(bs1, sn);
2337 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2338 bdrv_get_device_name(bs1));
2344 if (saved_vm_running)
2348 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2351 int saved_vm_running;
2354 saved_vm_running = runstate_is_running();
2355 vm_stop(RUN_STATE_SAVE_VM);
2357 f = qemu_fopen(filename, "wb");
2359 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2362 ret = qemu_save_device_state(f);
2365 error_set(errp, QERR_IO_ERROR);
2369 if (saved_vm_running)
2373 int load_vmstate(const char *name)
2375 BlockDriverState *bs, *bs_vm_state;
2376 QEMUSnapshotInfo sn;
2380 bs_vm_state = bdrv_snapshots();
2382 error_report("No block device supports snapshots");
2386 /* Don't even try to load empty VM states */
2387 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2390 } else if (sn.vm_state_size == 0) {
2391 error_report("This is a disk-only snapshot. Revert to it offline "
2396 /* Verify if there is any device that doesn't support snapshots and is
2397 writable and check if the requested snapshot is available too. */
2399 while ((bs = bdrv_next(bs))) {
2401 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2405 if (!bdrv_can_snapshot(bs)) {
2406 error_report("Device '%s' is writable but does not support snapshots.",
2407 bdrv_get_device_name(bs));
2411 ret = bdrv_snapshot_find(bs, &sn, name);
2413 error_report("Device '%s' does not have the requested snapshot '%s'",
2414 bdrv_get_device_name(bs), name);
2419 /* Flush all IO requests so they don't interfere with the new state. */
2423 while ((bs = bdrv_next(bs))) {
2424 if (bdrv_can_snapshot(bs)) {
2425 ret = bdrv_snapshot_goto(bs, name);
2427 error_report("Error %d while activating snapshot '%s' on '%s'",
2428 ret, name, bdrv_get_device_name(bs));
2434 /* restore the VM state */
2435 f = qemu_fopen_bdrv(bs_vm_state, 0);
2437 error_report("Could not open VM state file");
2441 qemu_system_reset(VMRESET_SILENT);
2442 ret = qemu_loadvm_state(f);
2446 error_report("Error %d while loading VM state", ret);
2453 void do_delvm(Monitor *mon, const QDict *qdict)
2455 BlockDriverState *bs, *bs1;
2457 const char *name = qdict_get_str(qdict, "name");
2459 bs = bdrv_snapshots();
2461 monitor_printf(mon, "No block device supports snapshots\n");
2466 while ((bs1 = bdrv_next(bs1))) {
2467 if (bdrv_can_snapshot(bs1)) {
2468 ret = bdrv_snapshot_delete(bs1, name);
2470 if (ret == -ENOTSUP)
2472 "Snapshots not supported on device '%s'\n",
2473 bdrv_get_device_name(bs1));
2475 monitor_printf(mon, "Error %d while deleting snapshot on "
2476 "'%s'\n", ret, bdrv_get_device_name(bs1));
2482 void do_info_snapshots(Monitor *mon, const QDict *qdict)
2484 BlockDriverState *bs, *bs1;
2485 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2486 int nb_sns, i, ret, available;
2488 int *available_snapshots;
2491 bs = bdrv_snapshots();
2493 monitor_printf(mon, "No available block device supports snapshots\n");
2497 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2499 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2504 monitor_printf(mon, "There is no snapshot available.\n");
2508 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2510 for (i = 0; i < nb_sns; i++) {
2515 while ((bs1 = bdrv_next(bs1))) {
2516 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2517 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2526 available_snapshots[total] = i;
2532 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2533 for (i = 0; i < total; i++) {
2534 sn = &sn_tab[available_snapshots[i]];
2535 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2538 monitor_printf(mon, "There is no suitable snapshot available\n");
2542 g_free(available_snapshots);
2546 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2548 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2549 memory_region_name(mr), dev);
2552 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2554 /* Nothing do to while the implementation is in RAMBlock */
2557 void vmstate_register_ram_global(MemoryRegion *mr)
2559 vmstate_register_ram(mr, NULL);