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"
43 #include "block/snapshot.h"
44 #include "block/qapi.h"
46 #define SELF_ANNOUNCE_ROUNDS 5
49 #define ETH_P_RARP 0x8035
51 #define ARP_HTYPE_ETH 0x0001
52 #define ARP_PTYPE_IP 0x0800
53 #define ARP_OP_REQUEST_REV 0x3
55 static int announce_self_create(uint8_t *buf,
58 /* Ethernet header. */
59 memset(buf, 0xff, 6); /* destination MAC addr */
60 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
61 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
64 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
65 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
66 *(buf + 18) = 6; /* hardware addr length (ethernet) */
67 *(buf + 19) = 4; /* protocol addr length (IPv4) */
68 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
69 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
70 memset(buf + 28, 0x00, 4); /* source protocol addr */
71 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
72 memset(buf + 38, 0x00, 4); /* target protocol addr */
74 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
75 memset(buf + 42, 0x00, 18);
77 return 60; /* len (FCS will be added by hardware) */
80 static void qemu_announce_self_iter(NICState *nic, void *opaque)
85 len = announce_self_create(buf, nic->conf->macaddr.a);
87 qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
91 static void qemu_announce_self_once(void *opaque)
93 static int count = SELF_ANNOUNCE_ROUNDS;
94 QEMUTimer *timer = *(QEMUTimer **)opaque;
96 qemu_foreach_nic(qemu_announce_self_iter, NULL);
99 /* delay 50ms, 150ms, 250ms, ... */
100 timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +
101 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
108 void qemu_announce_self(void)
110 static QEMUTimer *timer;
111 timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer);
112 qemu_announce_self_once(&timer);
115 /***********************************************************/
116 /* savevm/loadvm support */
118 #define IO_BUF_SIZE 32768
119 #define MAX_IOV_SIZE MIN(IOV_MAX, 64)
122 const QEMUFileOps *ops;
128 int64_t pos; /* start of buffer when writing, end of buffer
131 int buf_size; /* 0 when writing */
132 uint8_t buf[IO_BUF_SIZE];
134 struct iovec iov[MAX_IOV_SIZE];
140 typedef struct QEMUFileStdio
146 typedef struct QEMUFileSocket
152 static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
155 QEMUFileSocket *s = opaque;
157 ssize_t size = iov_size(iov, iovcnt);
159 len = iov_send(s->fd, iov, iovcnt, 0, size);
161 len = -socket_error();
166 static int socket_get_fd(void *opaque)
168 QEMUFileSocket *s = opaque;
173 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
175 QEMUFileSocket *s = opaque;
179 len = qemu_recv(s->fd, buf, size, 0);
183 if (socket_error() == EAGAIN) {
184 yield_until_fd_readable(s->fd);
185 } else if (socket_error() != EINTR) {
191 len = -socket_error();
196 static int socket_close(void *opaque)
198 QEMUFileSocket *s = opaque;
204 static int stdio_get_fd(void *opaque)
206 QEMUFileStdio *s = opaque;
208 return fileno(s->stdio_file);
211 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
213 QEMUFileStdio *s = opaque;
214 return fwrite(buf, 1, size, s->stdio_file);
217 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
219 QEMUFileStdio *s = opaque;
220 FILE *fp = s->stdio_file;
225 bytes = fread(buf, 1, size, fp);
226 if (bytes != 0 || !ferror(fp)) {
229 if (errno == EAGAIN) {
230 yield_until_fd_readable(fileno(fp));
231 } else if (errno != EINTR) {
238 static int stdio_pclose(void *opaque)
240 QEMUFileStdio *s = opaque;
242 ret = pclose(s->stdio_file);
245 } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
246 /* close succeeded, but non-zero exit code: */
247 ret = -EIO; /* fake errno value */
253 static int stdio_fclose(void *opaque)
255 QEMUFileStdio *s = opaque;
258 if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
259 int fd = fileno(s->stdio_file);
262 ret = fstat(fd, &st);
263 if (ret == 0 && S_ISREG(st.st_mode)) {
265 * If the file handle is a regular file make sure the
266 * data is flushed to disk before signaling success.
275 if (fclose(s->stdio_file) == EOF) {
282 static const QEMUFileOps stdio_pipe_read_ops = {
283 .get_fd = stdio_get_fd,
284 .get_buffer = stdio_get_buffer,
285 .close = stdio_pclose
288 static const QEMUFileOps stdio_pipe_write_ops = {
289 .get_fd = stdio_get_fd,
290 .put_buffer = stdio_put_buffer,
291 .close = stdio_pclose
294 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
299 if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
300 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
304 stdio_file = popen(command, mode);
305 if (stdio_file == NULL) {
309 s = g_malloc0(sizeof(QEMUFileStdio));
311 s->stdio_file = stdio_file;
314 s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
316 s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
321 static const QEMUFileOps stdio_file_read_ops = {
322 .get_fd = stdio_get_fd,
323 .get_buffer = stdio_get_buffer,
324 .close = stdio_fclose
327 static const QEMUFileOps stdio_file_write_ops = {
328 .get_fd = stdio_get_fd,
329 .put_buffer = stdio_put_buffer,
330 .close = stdio_fclose
333 static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
336 QEMUFileSocket *s = opaque;
338 ssize_t size = iov_size(iov, iovcnt);
344 /* Find the next start position; skip all full-sized vector elements */
345 while (offset >= iov[0].iov_len) {
346 offset -= iov[0].iov_len;
350 /* skip `offset' bytes from the (now) first element, undo it on exit */
352 iov[0].iov_base += offset;
353 iov[0].iov_len -= offset;
356 len = writev(s->fd, iov, iovcnt);
357 } while (len == -1 && errno == EINTR);
362 /* Undo the changes above */
363 iov[0].iov_base -= offset;
364 iov[0].iov_len += offset;
366 /* Prepare for the next iteration */
375 static int unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
377 QEMUFileSocket *s = opaque;
381 len = read(s->fd, buf, size);
385 if (errno == EAGAIN) {
386 yield_until_fd_readable(s->fd);
387 } else if (errno != EINTR) {
398 static int unix_close(void *opaque)
400 QEMUFileSocket *s = opaque;
406 static const QEMUFileOps unix_read_ops = {
407 .get_fd = socket_get_fd,
408 .get_buffer = unix_get_buffer,
412 static const QEMUFileOps unix_write_ops = {
413 .get_fd = socket_get_fd,
414 .writev_buffer = unix_writev_buffer,
418 QEMUFile *qemu_fdopen(int fd, const char *mode)
423 (mode[0] != 'r' && mode[0] != 'w') ||
424 mode[1] != 'b' || mode[2] != 0) {
425 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
429 s = g_malloc0(sizeof(QEMUFileSocket));
433 s->file = qemu_fopen_ops(s, &unix_read_ops);
435 s->file = qemu_fopen_ops(s, &unix_write_ops);
440 static const QEMUFileOps socket_read_ops = {
441 .get_fd = socket_get_fd,
442 .get_buffer = socket_get_buffer,
443 .close = socket_close
446 static const QEMUFileOps socket_write_ops = {
447 .get_fd = socket_get_fd,
448 .writev_buffer = socket_writev_buffer,
449 .close = socket_close
452 bool qemu_file_mode_is_not_valid(const char *mode)
455 (mode[0] != 'r' && mode[0] != 'w') ||
456 mode[1] != 'b' || mode[2] != 0) {
457 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
464 QEMUFile *qemu_fopen_socket(int fd, const char *mode)
468 if (qemu_file_mode_is_not_valid(mode)) {
472 s = g_malloc0(sizeof(QEMUFileSocket));
474 if (mode[0] == 'w') {
475 qemu_set_block(s->fd);
476 s->file = qemu_fopen_ops(s, &socket_write_ops);
478 s->file = qemu_fopen_ops(s, &socket_read_ops);
483 QEMUFile *qemu_fopen(const char *filename, const char *mode)
487 if (qemu_file_mode_is_not_valid(mode)) {
491 s = g_malloc0(sizeof(QEMUFileStdio));
493 s->stdio_file = fopen(filename, mode);
498 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
500 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
508 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
514 qemu_iovec_init_external(&qiov, iov, iovcnt);
515 ret = bdrv_writev_vmstate(opaque, &qiov, pos);
523 static int block_put_buffer(void *opaque, const uint8_t *buf,
524 int64_t pos, int size)
526 bdrv_save_vmstate(opaque, buf, pos, size);
530 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
532 return bdrv_load_vmstate(opaque, buf, pos, size);
535 static int bdrv_fclose(void *opaque)
537 return bdrv_flush(opaque);
540 static const QEMUFileOps bdrv_read_ops = {
541 .get_buffer = block_get_buffer,
545 static const QEMUFileOps bdrv_write_ops = {
546 .put_buffer = block_put_buffer,
547 .writev_buffer = block_writev_buffer,
551 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
554 return qemu_fopen_ops(bs, &bdrv_write_ops);
555 return qemu_fopen_ops(bs, &bdrv_read_ops);
558 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
562 f = g_malloc0(sizeof(QEMUFile));
570 * Get last error for stream f
572 * Return negative error value if there has been an error on previous
573 * operations, return 0 if no error happened.
576 int qemu_file_get_error(QEMUFile *f)
578 return f->last_error;
581 static void qemu_file_set_error(QEMUFile *f, int ret)
583 if (f->last_error == 0) {
588 static inline bool qemu_file_is_writable(QEMUFile *f)
590 return f->ops->writev_buffer || f->ops->put_buffer;
594 * Flushes QEMUFile buffer
596 * If there is writev_buffer QEMUFileOps it uses it otherwise uses
599 void qemu_fflush(QEMUFile *f)
603 if (!qemu_file_is_writable(f)) {
607 if (f->ops->writev_buffer) {
609 ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
612 if (f->buf_index > 0) {
613 ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
622 qemu_file_set_error(f, ret);
626 void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
630 if (f->ops->before_ram_iterate) {
631 ret = f->ops->before_ram_iterate(f, f->opaque, flags);
633 qemu_file_set_error(f, ret);
638 void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
642 if (f->ops->after_ram_iterate) {
643 ret = f->ops->after_ram_iterate(f, f->opaque, flags);
645 qemu_file_set_error(f, ret);
650 void ram_control_load_hook(QEMUFile *f, uint64_t flags)
654 if (f->ops->hook_ram_load) {
655 ret = f->ops->hook_ram_load(f, f->opaque, flags);
657 qemu_file_set_error(f, ret);
660 qemu_file_set_error(f, ret);
664 size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
665 ram_addr_t offset, size_t size, int *bytes_sent)
667 if (f->ops->save_page) {
668 int ret = f->ops->save_page(f, f->opaque, block_offset,
669 offset, size, bytes_sent);
671 if (ret != RAM_SAVE_CONTROL_DELAYED) {
672 if (bytes_sent && *bytes_sent > 0) {
673 qemu_update_position(f, *bytes_sent);
674 } else if (ret < 0) {
675 qemu_file_set_error(f, ret);
682 return RAM_SAVE_CONTROL_NOT_SUPP;
685 static void qemu_fill_buffer(QEMUFile *f)
690 assert(!qemu_file_is_writable(f));
692 pending = f->buf_size - f->buf_index;
694 memmove(f->buf, f->buf + f->buf_index, pending);
697 f->buf_size = pending;
699 len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
700 IO_BUF_SIZE - pending);
704 } else if (len == 0) {
705 qemu_file_set_error(f, -EIO);
706 } else if (len != -EAGAIN)
707 qemu_file_set_error(f, len);
710 int qemu_get_fd(QEMUFile *f)
712 if (f->ops->get_fd) {
713 return f->ops->get_fd(f->opaque);
718 void qemu_update_position(QEMUFile *f, size_t size)
725 * Returns negative error value if any error happened on previous operations or
726 * while closing the file. Returns 0 or positive number on success.
728 * The meaning of return value on success depends on the specific backend
731 int qemu_fclose(QEMUFile *f)
735 ret = qemu_file_get_error(f);
738 int ret2 = f->ops->close(f->opaque);
743 /* If any error was spotted before closing, we should report it
744 * instead of the close() return value.
753 static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
755 /* check for adjacent buffer and coalesce them */
756 if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
757 f->iov[f->iovcnt - 1].iov_len) {
758 f->iov[f->iovcnt - 1].iov_len += size;
760 f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
761 f->iov[f->iovcnt++].iov_len = size;
764 if (f->iovcnt >= MAX_IOV_SIZE) {
769 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
771 if (!f->ops->writev_buffer) {
772 qemu_put_buffer(f, buf, size);
780 f->bytes_xfer += size;
781 add_to_iovec(f, buf, size);
784 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
793 l = IO_BUF_SIZE - f->buf_index;
796 memcpy(f->buf + f->buf_index, buf, l);
798 if (f->ops->writev_buffer) {
799 add_to_iovec(f, f->buf + f->buf_index, l);
802 if (f->buf_index == IO_BUF_SIZE) {
805 if (qemu_file_get_error(f)) {
813 void qemu_put_byte(QEMUFile *f, int v)
819 f->buf[f->buf_index] = v;
821 if (f->ops->writev_buffer) {
822 add_to_iovec(f, f->buf + f->buf_index, 1);
825 if (f->buf_index == IO_BUF_SIZE) {
830 static void qemu_file_skip(QEMUFile *f, int size)
832 if (f->buf_index + size <= f->buf_size) {
833 f->buf_index += size;
837 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
842 assert(!qemu_file_is_writable(f));
844 index = f->buf_index + offset;
845 pending = f->buf_size - index;
846 if (pending < size) {
848 index = f->buf_index + offset;
849 pending = f->buf_size - index;
855 if (size > pending) {
859 memcpy(buf, f->buf + index, size);
863 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
868 while (pending > 0) {
871 res = qemu_peek_buffer(f, buf, pending, 0);
875 qemu_file_skip(f, res);
883 static int qemu_peek_byte(QEMUFile *f, int offset)
885 int index = f->buf_index + offset;
887 assert(!qemu_file_is_writable(f));
889 if (index >= f->buf_size) {
891 index = f->buf_index + offset;
892 if (index >= f->buf_size) {
896 return f->buf[index];
899 int qemu_get_byte(QEMUFile *f)
903 result = qemu_peek_byte(f, 0);
904 qemu_file_skip(f, 1);
908 int64_t qemu_ftell(QEMUFile *f)
914 int qemu_file_rate_limit(QEMUFile *f)
916 if (qemu_file_get_error(f)) {
919 if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
925 int64_t qemu_file_get_rate_limit(QEMUFile *f)
927 return f->xfer_limit;
930 void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
932 f->xfer_limit = limit;
935 void qemu_file_reset_rate_limit(QEMUFile *f)
940 void qemu_put_be16(QEMUFile *f, unsigned int v)
942 qemu_put_byte(f, v >> 8);
946 void qemu_put_be32(QEMUFile *f, unsigned int v)
948 qemu_put_byte(f, v >> 24);
949 qemu_put_byte(f, v >> 16);
950 qemu_put_byte(f, v >> 8);
954 void qemu_put_be64(QEMUFile *f, uint64_t v)
956 qemu_put_be32(f, v >> 32);
960 unsigned int qemu_get_be16(QEMUFile *f)
963 v = qemu_get_byte(f) << 8;
964 v |= qemu_get_byte(f);
968 unsigned int qemu_get_be32(QEMUFile *f)
971 v = qemu_get_byte(f) << 24;
972 v |= qemu_get_byte(f) << 16;
973 v |= qemu_get_byte(f) << 8;
974 v |= qemu_get_byte(f);
978 uint64_t qemu_get_be64(QEMUFile *f)
981 v = (uint64_t)qemu_get_be32(f) << 32;
982 v |= qemu_get_be32(f);
989 void timer_put(QEMUFile *f, QEMUTimer *ts)
991 uint64_t expire_time;
993 expire_time = timer_expire_time_ns(ts);
994 qemu_put_be64(f, expire_time);
997 void timer_get(QEMUFile *f, QEMUTimer *ts)
999 uint64_t expire_time;
1001 expire_time = qemu_get_be64(f);
1002 if (expire_time != -1) {
1003 timer_mod_ns(ts, expire_time);
1012 static int get_bool(QEMUFile *f, void *pv, size_t size)
1015 *v = qemu_get_byte(f);
1019 static void put_bool(QEMUFile *f, void *pv, size_t size)
1022 qemu_put_byte(f, *v);
1025 const VMStateInfo vmstate_info_bool = {
1033 static int get_int8(QEMUFile *f, void *pv, size_t size)
1040 static void put_int8(QEMUFile *f, void *pv, size_t size)
1046 const VMStateInfo vmstate_info_int8 = {
1054 static int get_int16(QEMUFile *f, void *pv, size_t size)
1057 qemu_get_sbe16s(f, v);
1061 static void put_int16(QEMUFile *f, void *pv, size_t size)
1064 qemu_put_sbe16s(f, v);
1067 const VMStateInfo vmstate_info_int16 = {
1075 static int get_int32(QEMUFile *f, void *pv, size_t size)
1078 qemu_get_sbe32s(f, v);
1082 static void put_int32(QEMUFile *f, void *pv, size_t size)
1085 qemu_put_sbe32s(f, v);
1088 const VMStateInfo vmstate_info_int32 = {
1094 /* 32 bit int. See that the received value is the same than the one
1097 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
1101 qemu_get_sbe32s(f, &v2);
1108 const VMStateInfo vmstate_info_int32_equal = {
1109 .name = "int32 equal",
1110 .get = get_int32_equal,
1114 /* 32 bit int. Check that the received value is non-negative
1115 * and less than or equal to the one in the field.
1118 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
1122 qemu_get_sbe32s(f, &loaded);
1124 if (loaded >= 0 && loaded <= *cur) {
1131 const VMStateInfo vmstate_info_int32_le = {
1133 .get = get_int32_le,
1139 static int get_int64(QEMUFile *f, void *pv, size_t size)
1142 qemu_get_sbe64s(f, v);
1146 static void put_int64(QEMUFile *f, void *pv, size_t size)
1149 qemu_put_sbe64s(f, v);
1152 const VMStateInfo vmstate_info_int64 = {
1158 /* 8 bit unsigned int */
1160 static int get_uint8(QEMUFile *f, void *pv, size_t size)
1167 static void put_uint8(QEMUFile *f, void *pv, size_t size)
1173 const VMStateInfo vmstate_info_uint8 = {
1179 /* 16 bit unsigned int */
1181 static int get_uint16(QEMUFile *f, void *pv, size_t size)
1184 qemu_get_be16s(f, v);
1188 static void put_uint16(QEMUFile *f, void *pv, size_t size)
1191 qemu_put_be16s(f, v);
1194 const VMStateInfo vmstate_info_uint16 = {
1200 /* 32 bit unsigned int */
1202 static int get_uint32(QEMUFile *f, void *pv, size_t size)
1205 qemu_get_be32s(f, v);
1209 static void put_uint32(QEMUFile *f, void *pv, size_t size)
1212 qemu_put_be32s(f, v);
1215 const VMStateInfo vmstate_info_uint32 = {
1221 /* 32 bit uint. See that the received value is the same than the one
1224 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1228 qemu_get_be32s(f, &v2);
1236 const VMStateInfo vmstate_info_uint32_equal = {
1237 .name = "uint32 equal",
1238 .get = get_uint32_equal,
1242 /* 64 bit unsigned int */
1244 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1247 qemu_get_be64s(f, v);
1251 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1254 qemu_put_be64s(f, v);
1257 const VMStateInfo vmstate_info_uint64 = {
1263 /* 64 bit unsigned int. See that the received value is the same than the one
1266 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
1270 qemu_get_be64s(f, &v2);
1278 const VMStateInfo vmstate_info_uint64_equal = {
1279 .name = "int64 equal",
1280 .get = get_uint64_equal,
1284 /* 8 bit int. See that the received value is the same than the one
1287 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1291 qemu_get_8s(f, &v2);
1298 const VMStateInfo vmstate_info_uint8_equal = {
1299 .name = "uint8 equal",
1300 .get = get_uint8_equal,
1304 /* 16 bit unsigned int int. See that the received value is the same than the one
1307 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1311 qemu_get_be16s(f, &v2);
1318 const VMStateInfo vmstate_info_uint16_equal = {
1319 .name = "uint16 equal",
1320 .get = get_uint16_equal,
1324 /* floating point */
1326 static int get_float64(QEMUFile *f, void *pv, size_t size)
1330 *v = make_float64(qemu_get_be64(f));
1334 static void put_float64(QEMUFile *f, void *pv, size_t size)
1338 qemu_put_be64(f, float64_val(*v));
1341 const VMStateInfo vmstate_info_float64 = {
1349 static int get_timer(QEMUFile *f, void *pv, size_t size)
1356 static void put_timer(QEMUFile *f, void *pv, size_t size)
1362 const VMStateInfo vmstate_info_timer = {
1368 /* uint8_t buffers */
1370 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1373 qemu_get_buffer(f, v, size);
1377 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1380 qemu_put_buffer(f, v, size);
1383 const VMStateInfo vmstate_info_buffer = {
1389 /* unused buffers: space that was used for some fields that are
1390 not useful anymore */
1392 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1398 block_len = MIN(sizeof(buf), size);
1400 qemu_get_buffer(f, buf, block_len);
1405 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1407 static const uint8_t buf[1024];
1411 block_len = MIN(sizeof(buf), size);
1413 qemu_put_buffer(f, buf, block_len);
1417 const VMStateInfo vmstate_info_unused_buffer = {
1418 .name = "unused_buffer",
1419 .get = get_unused_buffer,
1420 .put = put_unused_buffer,
1423 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1424 * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1425 * bit words with the bits in big endian order. The in-memory format
1426 * is an array of 'unsigned long', which may be either 32 or 64 bits.
1428 /* This is the number of 64 bit words sent over the wire */
1429 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1430 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1432 unsigned long *bmp = pv;
1434 for (i = 0; i < BITS_TO_U64S(size); i++) {
1435 uint64_t w = qemu_get_be64(f);
1437 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1438 bmp[idx++] = w >> 32;
1444 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1446 unsigned long *bmp = pv;
1448 for (i = 0; i < BITS_TO_U64S(size); i++) {
1449 uint64_t w = bmp[idx++];
1450 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1451 w |= ((uint64_t)bmp[idx++]) << 32;
1453 qemu_put_be64(f, w);
1457 const VMStateInfo vmstate_info_bitmap = {
1463 typedef struct CompatEntry {
1468 typedef struct SaveStateEntry {
1469 QTAILQ_ENTRY(SaveStateEntry) entry;
1475 SaveVMHandlers *ops;
1476 const VMStateDescription *vmsd;
1478 CompatEntry *compat;
1484 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1485 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1486 static int global_section_id;
1488 static int calculate_new_instance_id(const char *idstr)
1491 int instance_id = 0;
1493 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1494 if (strcmp(idstr, se->idstr) == 0
1495 && instance_id <= se->instance_id) {
1496 instance_id = se->instance_id + 1;
1502 static int calculate_compat_instance_id(const char *idstr)
1505 int instance_id = 0;
1507 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1511 if (strcmp(idstr, se->compat->idstr) == 0
1512 && instance_id <= se->compat->instance_id) {
1513 instance_id = se->compat->instance_id + 1;
1519 /* TODO: Individual devices generally have very little idea about the rest
1520 of the system, so instance_id should be removed/replaced.
1521 Meanwhile pass -1 as instance_id if you do not already have a clearly
1522 distinguishing id for all instances of your device class. */
1523 int register_savevm_live(DeviceState *dev,
1527 SaveVMHandlers *ops,
1532 se = g_malloc0(sizeof(SaveStateEntry));
1533 se->version_id = version_id;
1534 se->section_id = global_section_id++;
1536 se->opaque = opaque;
1539 /* if this is a live_savem then set is_ram */
1540 if (ops->save_live_setup != NULL) {
1545 char *id = qdev_get_dev_path(dev);
1547 pstrcpy(se->idstr, sizeof(se->idstr), id);
1548 pstrcat(se->idstr, sizeof(se->idstr), "/");
1551 se->compat = g_malloc0(sizeof(CompatEntry));
1552 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1553 se->compat->instance_id = instance_id == -1 ?
1554 calculate_compat_instance_id(idstr) : instance_id;
1558 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1560 if (instance_id == -1) {
1561 se->instance_id = calculate_new_instance_id(se->idstr);
1563 se->instance_id = instance_id;
1565 assert(!se->compat || se->instance_id == 0);
1566 /* add at the end of list */
1567 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1571 int register_savevm(DeviceState *dev,
1575 SaveStateHandler *save_state,
1576 LoadStateHandler *load_state,
1579 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1580 ops->save_state = save_state;
1581 ops->load_state = load_state;
1582 return register_savevm_live(dev, idstr, instance_id, version_id,
1586 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1588 SaveStateEntry *se, *new_se;
1592 char *path = qdev_get_dev_path(dev);
1594 pstrcpy(id, sizeof(id), path);
1595 pstrcat(id, sizeof(id), "/");
1599 pstrcat(id, sizeof(id), idstr);
1601 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1602 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1603 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1613 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1614 const VMStateDescription *vmsd,
1615 void *opaque, int alias_id,
1616 int required_for_version)
1620 /* If this triggers, alias support can be dropped for the vmsd. */
1621 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1623 se = g_malloc0(sizeof(SaveStateEntry));
1624 se->version_id = vmsd->version_id;
1625 se->section_id = global_section_id++;
1626 se->opaque = opaque;
1628 se->alias_id = alias_id;
1629 se->no_migrate = vmsd->unmigratable;
1632 char *id = qdev_get_dev_path(dev);
1634 pstrcpy(se->idstr, sizeof(se->idstr), id);
1635 pstrcat(se->idstr, sizeof(se->idstr), "/");
1638 se->compat = g_malloc0(sizeof(CompatEntry));
1639 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1640 se->compat->instance_id = instance_id == -1 ?
1641 calculate_compat_instance_id(vmsd->name) : instance_id;
1645 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1647 if (instance_id == -1) {
1648 se->instance_id = calculate_new_instance_id(se->idstr);
1650 se->instance_id = instance_id;
1652 assert(!se->compat || se->instance_id == 0);
1653 /* add at the end of list */
1654 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1658 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1661 SaveStateEntry *se, *new_se;
1663 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1664 if (se->vmsd == vmsd && se->opaque == opaque) {
1665 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1674 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1676 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1679 static int vmstate_n_elems(void *opaque, VMStateField *field)
1683 if (field->flags & VMS_ARRAY) {
1684 n_elems = field->num;
1685 } else if (field->flags & VMS_VARRAY_INT32) {
1686 n_elems = *(int32_t *)(opaque+field->num_offset);
1687 } else if (field->flags & VMS_VARRAY_UINT32) {
1688 n_elems = *(uint32_t *)(opaque+field->num_offset);
1689 } else if (field->flags & VMS_VARRAY_UINT16) {
1690 n_elems = *(uint16_t *)(opaque+field->num_offset);
1691 } else if (field->flags & VMS_VARRAY_UINT8) {
1692 n_elems = *(uint8_t *)(opaque+field->num_offset);
1698 static int vmstate_size(void *opaque, VMStateField *field)
1700 int size = field->size;
1702 if (field->flags & VMS_VBUFFER) {
1703 size = *(int32_t *)(opaque+field->size_offset);
1704 if (field->flags & VMS_MULTIPLY) {
1705 size *= field->size;
1712 static void *vmstate_base_addr(void *opaque, VMStateField *field)
1714 void *base_addr = opaque + field->offset;
1716 if (field->flags & VMS_POINTER) {
1717 base_addr = *(void **)base_addr + field->start;
1723 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1724 void *opaque, int version_id)
1726 VMStateField *field = vmsd->fields;
1729 if (version_id > vmsd->version_id) {
1732 if (version_id < vmsd->minimum_version_id) {
1733 if (vmsd->load_state_old &&
1734 version_id >= vmsd->minimum_version_id_old) {
1735 return vmsd->load_state_old(f, opaque, version_id);
1739 if (vmsd->pre_load) {
1740 int ret = vmsd->pre_load(opaque);
1744 while(field->name) {
1745 if ((field->field_exists &&
1746 field->field_exists(opaque, version_id)) ||
1747 (!field->field_exists &&
1748 field->version_id <= version_id)) {
1749 void *base_addr = vmstate_base_addr(opaque, field);
1750 int i, n_elems = vmstate_n_elems(opaque, field);
1751 int size = vmstate_size(opaque, field);
1753 for (i = 0; i < n_elems; i++) {
1754 void *addr = base_addr + size * i;
1756 if (field->flags & VMS_ARRAY_OF_POINTER) {
1757 addr = *(void **)addr;
1759 if (field->flags & VMS_STRUCT) {
1760 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1762 ret = field->info->get(f, addr, size);
1769 } else if (field->flags & VMS_MUST_EXIST) {
1770 fprintf(stderr, "Input validation failed: %s/%s\n",
1771 vmsd->name, field->name);
1776 ret = vmstate_subsection_load(f, vmsd, opaque);
1780 if (vmsd->post_load) {
1781 return vmsd->post_load(opaque, version_id);
1786 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1789 VMStateField *field = vmsd->fields;
1791 if (vmsd->pre_save) {
1792 vmsd->pre_save(opaque);
1794 while(field->name) {
1795 if (!field->field_exists ||
1796 field->field_exists(opaque, vmsd->version_id)) {
1797 void *base_addr = vmstate_base_addr(opaque, field);
1798 int i, n_elems = vmstate_n_elems(opaque, field);
1799 int size = vmstate_size(opaque, field);
1801 for (i = 0; i < n_elems; i++) {
1802 void *addr = base_addr + size * i;
1804 if (field->flags & VMS_ARRAY_OF_POINTER) {
1805 addr = *(void **)addr;
1807 if (field->flags & VMS_STRUCT) {
1808 vmstate_save_state(f, field->vmsd, addr);
1810 field->info->put(f, addr, size);
1814 if (field->flags & VMS_MUST_EXIST) {
1815 fprintf(stderr, "Output state validation failed: %s/%s\n",
1816 vmsd->name, field->name);
1817 assert(!(field->flags & VMS_MUST_EXIST));
1822 vmstate_subsection_save(f, vmsd, opaque);
1825 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1827 if (!se->vmsd) { /* Old style */
1828 return se->ops->load_state(f, se->opaque, version_id);
1830 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1833 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1835 if (!se->vmsd) { /* Old style */
1836 se->ops->save_state(f, se->opaque);
1839 vmstate_save_state(f,se->vmsd, se->opaque);
1842 #define QEMU_VM_FILE_MAGIC 0x5145564d
1843 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1844 #define QEMU_VM_FILE_VERSION 0x00000003
1846 #define QEMU_VM_EOF 0x00
1847 #define QEMU_VM_SECTION_START 0x01
1848 #define QEMU_VM_SECTION_PART 0x02
1849 #define QEMU_VM_SECTION_END 0x03
1850 #define QEMU_VM_SECTION_FULL 0x04
1851 #define QEMU_VM_SUBSECTION 0x05
1853 bool qemu_savevm_state_blocked(Error **errp)
1857 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1858 if (se->no_migrate) {
1859 error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1866 void qemu_savevm_state_begin(QEMUFile *f,
1867 const MigrationParams *params)
1872 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1873 if (!se->ops || !se->ops->set_params) {
1876 se->ops->set_params(params, se->opaque);
1879 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1880 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1882 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1885 if (!se->ops || !se->ops->save_live_setup) {
1888 if (se->ops && se->ops->is_active) {
1889 if (!se->ops->is_active(se->opaque)) {
1894 qemu_put_byte(f, QEMU_VM_SECTION_START);
1895 qemu_put_be32(f, se->section_id);
1898 len = strlen(se->idstr);
1899 qemu_put_byte(f, len);
1900 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1902 qemu_put_be32(f, se->instance_id);
1903 qemu_put_be32(f, se->version_id);
1905 ret = se->ops->save_live_setup(f, se->opaque);
1907 qemu_file_set_error(f, ret);
1914 * this function has three return values:
1915 * negative: there was one error, and we have -errno.
1916 * 0 : We haven't finished, caller have to go again
1917 * 1 : We have finished, we can go to complete phase
1919 int qemu_savevm_state_iterate(QEMUFile *f)
1924 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1925 if (!se->ops || !se->ops->save_live_iterate) {
1928 if (se->ops && se->ops->is_active) {
1929 if (!se->ops->is_active(se->opaque)) {
1933 if (qemu_file_rate_limit(f)) {
1936 trace_savevm_section_start();
1938 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1939 qemu_put_be32(f, se->section_id);
1941 ret = se->ops->save_live_iterate(f, se->opaque);
1942 trace_savevm_section_end(se->section_id);
1945 qemu_file_set_error(f, ret);
1948 /* Do not proceed to the next vmstate before this one reported
1949 completion of the current stage. This serializes the migration
1950 and reduces the probability that a faster changing state is
1951 synchronized over and over again. */
1958 void qemu_savevm_state_complete(QEMUFile *f)
1963 cpu_synchronize_all_states();
1965 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1966 if (!se->ops || !se->ops->save_live_complete) {
1969 if (se->ops && se->ops->is_active) {
1970 if (!se->ops->is_active(se->opaque)) {
1974 trace_savevm_section_start();
1976 qemu_put_byte(f, QEMU_VM_SECTION_END);
1977 qemu_put_be32(f, se->section_id);
1979 ret = se->ops->save_live_complete(f, se->opaque);
1980 trace_savevm_section_end(se->section_id);
1982 qemu_file_set_error(f, ret);
1987 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1990 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1993 trace_savevm_section_start();
1995 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1996 qemu_put_be32(f, se->section_id);
1999 len = strlen(se->idstr);
2000 qemu_put_byte(f, len);
2001 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
2003 qemu_put_be32(f, se->instance_id);
2004 qemu_put_be32(f, se->version_id);
2006 vmstate_save(f, se);
2007 trace_savevm_section_end(se->section_id);
2010 qemu_put_byte(f, QEMU_VM_EOF);
2014 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
2019 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2020 if (!se->ops || !se->ops->save_live_pending) {
2023 if (se->ops && se->ops->is_active) {
2024 if (!se->ops->is_active(se->opaque)) {
2028 ret += se->ops->save_live_pending(f, se->opaque, max_size);
2033 void qemu_savevm_state_cancel(void)
2037 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2038 if (se->ops && se->ops->cancel) {
2039 se->ops->cancel(se->opaque);
2044 static int qemu_savevm_state(QEMUFile *f)
2047 MigrationParams params = {
2052 if (qemu_savevm_state_blocked(NULL)) {
2056 qemu_mutex_unlock_iothread();
2057 qemu_savevm_state_begin(f, ¶ms);
2058 qemu_mutex_lock_iothread();
2060 while (qemu_file_get_error(f) == 0) {
2061 if (qemu_savevm_state_iterate(f) > 0) {
2066 ret = qemu_file_get_error(f);
2068 qemu_savevm_state_complete(f);
2069 ret = qemu_file_get_error(f);
2072 qemu_savevm_state_cancel();
2077 static int qemu_save_device_state(QEMUFile *f)
2081 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
2082 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
2084 cpu_synchronize_all_states();
2086 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2092 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
2097 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
2098 qemu_put_be32(f, se->section_id);
2101 len = strlen(se->idstr);
2102 qemu_put_byte(f, len);
2103 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
2105 qemu_put_be32(f, se->instance_id);
2106 qemu_put_be32(f, se->version_id);
2108 vmstate_save(f, se);
2111 qemu_put_byte(f, QEMU_VM_EOF);
2113 return qemu_file_get_error(f);
2116 static SaveStateEntry *find_se(const char *idstr, int instance_id)
2120 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2121 if (!strcmp(se->idstr, idstr) &&
2122 (instance_id == se->instance_id ||
2123 instance_id == se->alias_id))
2125 /* Migrating from an older version? */
2126 if (strstr(se->idstr, idstr) && se->compat) {
2127 if (!strcmp(se->compat->idstr, idstr) &&
2128 (instance_id == se->compat->instance_id ||
2129 instance_id == se->alias_id))
2136 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
2138 while(sub && sub->needed) {
2139 if (strcmp(idstr, sub->vmsd->name) == 0) {
2147 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
2150 while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
2153 uint8_t version_id, len, size;
2154 const VMStateDescription *sub_vmsd;
2156 len = qemu_peek_byte(f, 1);
2157 if (len < strlen(vmsd->name) + 1) {
2158 /* subsection name has be be "section_name/a" */
2161 size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
2167 if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
2168 /* it don't have a valid subsection name */
2171 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
2172 if (sub_vmsd == NULL) {
2175 qemu_file_skip(f, 1); /* subsection */
2176 qemu_file_skip(f, 1); /* len */
2177 qemu_file_skip(f, len); /* idstr */
2178 version_id = qemu_get_be32(f);
2180 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
2188 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
2191 const VMStateSubsection *sub = vmsd->subsections;
2193 while (sub && sub->needed) {
2194 if (sub->needed(opaque)) {
2195 const VMStateDescription *vmsd = sub->vmsd;
2198 qemu_put_byte(f, QEMU_VM_SUBSECTION);
2199 len = strlen(vmsd->name);
2200 qemu_put_byte(f, len);
2201 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
2202 qemu_put_be32(f, vmsd->version_id);
2203 vmstate_save_state(f, vmsd, opaque);
2209 typedef struct LoadStateEntry {
2210 QLIST_ENTRY(LoadStateEntry) entry;
2216 int qemu_loadvm_state(QEMUFile *f)
2218 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
2219 QLIST_HEAD_INITIALIZER(loadvm_handlers);
2220 LoadStateEntry *le, *new_le;
2221 uint8_t section_type;
2225 if (qemu_savevm_state_blocked(NULL)) {
2229 v = qemu_get_be32(f);
2230 if (v != QEMU_VM_FILE_MAGIC)
2233 v = qemu_get_be32(f);
2234 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
2235 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
2238 if (v != QEMU_VM_FILE_VERSION)
2241 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
2242 uint32_t instance_id, version_id, section_id;
2247 switch (section_type) {
2248 case QEMU_VM_SECTION_START:
2249 case QEMU_VM_SECTION_FULL:
2250 /* Read section start */
2251 section_id = qemu_get_be32(f);
2252 len = qemu_get_byte(f);
2253 qemu_get_buffer(f, (uint8_t *)idstr, len);
2255 instance_id = qemu_get_be32(f);
2256 version_id = qemu_get_be32(f);
2258 /* Find savevm section */
2259 se = find_se(idstr, instance_id);
2261 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
2266 /* Validate version */
2267 if (version_id > se->version_id) {
2268 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
2269 version_id, idstr, se->version_id);
2275 le = g_malloc0(sizeof(*le));
2278 le->section_id = section_id;
2279 le->version_id = version_id;
2280 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
2282 ret = vmstate_load(f, le->se, le->version_id);
2284 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
2285 instance_id, idstr);
2289 case QEMU_VM_SECTION_PART:
2290 case QEMU_VM_SECTION_END:
2291 section_id = qemu_get_be32(f);
2293 QLIST_FOREACH(le, &loadvm_handlers, entry) {
2294 if (le->section_id == section_id) {
2299 fprintf(stderr, "Unknown savevm section %d\n", section_id);
2304 ret = vmstate_load(f, le->se, le->version_id);
2306 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2312 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2318 cpu_synchronize_all_post_init();
2323 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2324 QLIST_REMOVE(le, entry);
2329 ret = qemu_file_get_error(f);
2335 static BlockDriverState *find_vmstate_bs(void)
2337 BlockDriverState *bs = NULL;
2338 while ((bs = bdrv_next(bs))) {
2339 if (bdrv_can_snapshot(bs)) {
2347 * Deletes snapshots of a given name in all opened images.
2349 static int del_existing_snapshots(Monitor *mon, const char *name)
2351 BlockDriverState *bs;
2352 QEMUSnapshotInfo sn1, *snapshot = &sn1;
2356 while ((bs = bdrv_next(bs))) {
2357 if (bdrv_can_snapshot(bs) &&
2358 bdrv_snapshot_find(bs, snapshot, name) >= 0)
2360 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
2361 if (error_is_set(&err)) {
2363 "Error while deleting snapshot on device '%s':"
2365 bdrv_get_device_name(bs),
2366 error_get_pretty(err));
2376 void do_savevm(Monitor *mon, const QDict *qdict)
2378 BlockDriverState *bs, *bs1;
2379 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2382 int saved_vm_running;
2383 uint64_t vm_state_size;
2386 const char *name = qdict_get_try_str(qdict, "name");
2388 /* Verify if there is a device that doesn't support snapshots and is writable */
2390 while ((bs = bdrv_next(bs))) {
2392 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2396 if (!bdrv_can_snapshot(bs)) {
2397 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2398 bdrv_get_device_name(bs));
2403 bs = find_vmstate_bs();
2405 monitor_printf(mon, "No block device can accept snapshots\n");
2409 saved_vm_running = runstate_is_running();
2410 vm_stop(RUN_STATE_SAVE_VM);
2412 memset(sn, 0, sizeof(*sn));
2414 /* fill auxiliary fields */
2415 qemu_gettimeofday(&tv);
2416 sn->date_sec = tv.tv_sec;
2417 sn->date_nsec = tv.tv_usec * 1000;
2418 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2421 ret = bdrv_snapshot_find(bs, old_sn, name);
2423 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2424 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2426 pstrcpy(sn->name, sizeof(sn->name), name);
2429 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2430 localtime_r((const time_t *)&tv.tv_sec, &tm);
2431 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2434 /* Delete old snapshots of the same name */
2435 if (name && del_existing_snapshots(mon, name) < 0) {
2439 /* save the VM state */
2440 f = qemu_fopen_bdrv(bs, 1);
2442 monitor_printf(mon, "Could not open VM state file\n");
2445 ret = qemu_savevm_state(f);
2446 vm_state_size = qemu_ftell(f);
2449 monitor_printf(mon, "Error %d while writing VM\n", ret);
2453 /* create the snapshots */
2456 while ((bs1 = bdrv_next(bs1))) {
2457 if (bdrv_can_snapshot(bs1)) {
2458 /* Write VM state size only to the image that contains the state */
2459 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2460 ret = bdrv_snapshot_create(bs1, sn);
2462 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2463 bdrv_get_device_name(bs1));
2469 if (saved_vm_running)
2473 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2476 int saved_vm_running;
2479 saved_vm_running = runstate_is_running();
2480 vm_stop(RUN_STATE_SAVE_VM);
2482 f = qemu_fopen(filename, "wb");
2484 error_setg_file_open(errp, errno, filename);
2487 ret = qemu_save_device_state(f);
2490 error_set(errp, QERR_IO_ERROR);
2494 if (saved_vm_running)
2498 int load_vmstate(const char *name)
2500 BlockDriverState *bs, *bs_vm_state;
2501 QEMUSnapshotInfo sn;
2505 bs_vm_state = find_vmstate_bs();
2507 error_report("No block device supports snapshots");
2511 /* Don't even try to load empty VM states */
2512 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2515 } else if (sn.vm_state_size == 0) {
2516 error_report("This is a disk-only snapshot. Revert to it offline "
2521 /* Verify if there is any device that doesn't support snapshots and is
2522 writable and check if the requested snapshot is available too. */
2524 while ((bs = bdrv_next(bs))) {
2526 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2530 if (!bdrv_can_snapshot(bs)) {
2531 error_report("Device '%s' is writable but does not support snapshots.",
2532 bdrv_get_device_name(bs));
2536 ret = bdrv_snapshot_find(bs, &sn, name);
2538 error_report("Device '%s' does not have the requested snapshot '%s'",
2539 bdrv_get_device_name(bs), name);
2544 /* Flush all IO requests so they don't interfere with the new state. */
2548 while ((bs = bdrv_next(bs))) {
2549 if (bdrv_can_snapshot(bs)) {
2550 ret = bdrv_snapshot_goto(bs, name);
2552 error_report("Error %d while activating snapshot '%s' on '%s'",
2553 ret, name, bdrv_get_device_name(bs));
2559 /* restore the VM state */
2560 f = qemu_fopen_bdrv(bs_vm_state, 0);
2562 error_report("Could not open VM state file");
2566 qemu_system_reset(VMRESET_SILENT);
2567 ret = qemu_loadvm_state(f);
2571 error_report("Error %d while loading VM state", ret);
2578 void do_delvm(Monitor *mon, const QDict *qdict)
2580 BlockDriverState *bs, *bs1;
2582 const char *name = qdict_get_str(qdict, "name");
2584 bs = find_vmstate_bs();
2586 monitor_printf(mon, "No block device supports snapshots\n");
2591 while ((bs1 = bdrv_next(bs1))) {
2592 if (bdrv_can_snapshot(bs1)) {
2593 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
2594 if (error_is_set(&err)) {
2596 "Error while deleting snapshot on device '%s':"
2598 bdrv_get_device_name(bs),
2599 error_get_pretty(err));
2606 void do_info_snapshots(Monitor *mon, const QDict *qdict)
2608 BlockDriverState *bs, *bs1;
2609 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2610 int nb_sns, i, ret, available;
2612 int *available_snapshots;
2614 bs = find_vmstate_bs();
2616 monitor_printf(mon, "No available block device supports snapshots\n");
2620 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2622 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2627 monitor_printf(mon, "There is no snapshot available.\n");
2631 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2633 for (i = 0; i < nb_sns; i++) {
2638 while ((bs1 = bdrv_next(bs1))) {
2639 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2640 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2649 available_snapshots[total] = i;
2655 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
2656 monitor_printf(mon, "\n");
2657 for (i = 0; i < total; i++) {
2658 sn = &sn_tab[available_snapshots[i]];
2659 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
2660 monitor_printf(mon, "\n");
2663 monitor_printf(mon, "There is no suitable snapshot available\n");
2667 g_free(available_snapshots);
2671 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2673 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2674 memory_region_name(mr), dev);
2677 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2679 /* Nothing do to while the implementation is in RAMBlock */
2682 void vmstate_register_ram_global(MemoryRegion *mr)
2684 vmstate_register_ram(mr, NULL);