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 qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
101 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
103 qemu_del_timer(timer);
104 qemu_free_timer(timer);
108 void qemu_announce_self(void)
110 static QEMUTimer *timer;
111 timer = qemu_new_timer_ms(rt_clock, 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));
569 int qemu_file_get_error(QEMUFile *f)
571 return f->last_error;
574 static void qemu_file_set_error(QEMUFile *f, int ret)
576 if (f->last_error == 0) {
581 static inline bool qemu_file_is_writable(QEMUFile *f)
583 return f->ops->writev_buffer || f->ops->put_buffer;
587 * Flushes QEMUFile buffer
589 * If there is writev_buffer QEMUFileOps it uses it otherwise uses
592 void qemu_fflush(QEMUFile *f)
596 if (!qemu_file_is_writable(f)) {
600 if (f->ops->writev_buffer) {
602 ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
605 if (f->buf_index > 0) {
606 ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
615 qemu_file_set_error(f, ret);
619 void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
623 if (f->ops->before_ram_iterate) {
624 ret = f->ops->before_ram_iterate(f, f->opaque, flags);
626 qemu_file_set_error(f, ret);
631 void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
635 if (f->ops->after_ram_iterate) {
636 ret = f->ops->after_ram_iterate(f, f->opaque, flags);
638 qemu_file_set_error(f, ret);
643 void ram_control_load_hook(QEMUFile *f, uint64_t flags)
647 if (f->ops->hook_ram_load) {
648 ret = f->ops->hook_ram_load(f, f->opaque, flags);
650 qemu_file_set_error(f, ret);
653 qemu_file_set_error(f, ret);
657 size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
658 ram_addr_t offset, size_t size, int *bytes_sent)
660 if (f->ops->save_page) {
661 int ret = f->ops->save_page(f, f->opaque, block_offset,
662 offset, size, bytes_sent);
664 if (ret != RAM_SAVE_CONTROL_DELAYED) {
665 if (bytes_sent && *bytes_sent > 0) {
666 qemu_update_position(f, *bytes_sent);
667 } else if (ret < 0) {
668 qemu_file_set_error(f, ret);
675 return RAM_SAVE_CONTROL_NOT_SUPP;
678 static void qemu_fill_buffer(QEMUFile *f)
683 assert(!qemu_file_is_writable(f));
685 pending = f->buf_size - f->buf_index;
687 memmove(f->buf, f->buf + f->buf_index, pending);
690 f->buf_size = pending;
692 len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
693 IO_BUF_SIZE - pending);
697 } else if (len == 0) {
698 qemu_file_set_error(f, -EIO);
699 } else if (len != -EAGAIN)
700 qemu_file_set_error(f, len);
703 int qemu_get_fd(QEMUFile *f)
705 if (f->ops->get_fd) {
706 return f->ops->get_fd(f->opaque);
711 void qemu_update_position(QEMUFile *f, size_t size)
718 * Returns negative error value if any error happened on previous operations or
719 * while closing the file. Returns 0 or positive number on success.
721 * The meaning of return value on success depends on the specific backend
724 int qemu_fclose(QEMUFile *f)
728 ret = qemu_file_get_error(f);
731 int ret2 = f->ops->close(f->opaque);
736 /* If any error was spotted before closing, we should report it
737 * instead of the close() return value.
746 static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
748 /* check for adjacent buffer and coalesce them */
749 if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
750 f->iov[f->iovcnt - 1].iov_len) {
751 f->iov[f->iovcnt - 1].iov_len += size;
753 f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
754 f->iov[f->iovcnt++].iov_len = size;
757 if (f->iovcnt >= MAX_IOV_SIZE) {
762 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
764 if (!f->ops->writev_buffer) {
765 qemu_put_buffer(f, buf, size);
773 f->bytes_xfer += size;
774 add_to_iovec(f, buf, size);
777 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
786 l = IO_BUF_SIZE - f->buf_index;
789 memcpy(f->buf + f->buf_index, buf, l);
790 f->bytes_xfer += size;
791 if (f->ops->writev_buffer) {
792 add_to_iovec(f, f->buf + f->buf_index, l);
795 if (f->buf_index == IO_BUF_SIZE) {
798 if (qemu_file_get_error(f)) {
806 void qemu_put_byte(QEMUFile *f, int v)
812 f->buf[f->buf_index] = v;
814 if (f->ops->writev_buffer) {
815 add_to_iovec(f, f->buf + f->buf_index, 1);
818 if (f->buf_index == IO_BUF_SIZE) {
823 static void qemu_file_skip(QEMUFile *f, int size)
825 if (f->buf_index + size <= f->buf_size) {
826 f->buf_index += size;
830 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
835 assert(!qemu_file_is_writable(f));
837 index = f->buf_index + offset;
838 pending = f->buf_size - index;
839 if (pending < size) {
841 index = f->buf_index + offset;
842 pending = f->buf_size - index;
848 if (size > pending) {
852 memcpy(buf, f->buf + index, size);
856 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
861 while (pending > 0) {
864 res = qemu_peek_buffer(f, buf, pending, 0);
868 qemu_file_skip(f, res);
876 static int qemu_peek_byte(QEMUFile *f, int offset)
878 int index = f->buf_index + offset;
880 assert(!qemu_file_is_writable(f));
882 if (index >= f->buf_size) {
884 index = f->buf_index + offset;
885 if (index >= f->buf_size) {
889 return f->buf[index];
892 int qemu_get_byte(QEMUFile *f)
896 result = qemu_peek_byte(f, 0);
897 qemu_file_skip(f, 1);
901 int64_t qemu_ftell(QEMUFile *f)
907 int qemu_file_rate_limit(QEMUFile *f)
909 if (qemu_file_get_error(f)) {
912 if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
918 int64_t qemu_file_get_rate_limit(QEMUFile *f)
920 return f->xfer_limit;
923 void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
925 f->xfer_limit = limit;
928 void qemu_file_reset_rate_limit(QEMUFile *f)
933 void qemu_put_be16(QEMUFile *f, unsigned int v)
935 qemu_put_byte(f, v >> 8);
939 void qemu_put_be32(QEMUFile *f, unsigned int v)
941 qemu_put_byte(f, v >> 24);
942 qemu_put_byte(f, v >> 16);
943 qemu_put_byte(f, v >> 8);
947 void qemu_put_be64(QEMUFile *f, uint64_t v)
949 qemu_put_be32(f, v >> 32);
953 unsigned int qemu_get_be16(QEMUFile *f)
956 v = qemu_get_byte(f) << 8;
957 v |= qemu_get_byte(f);
961 unsigned int qemu_get_be32(QEMUFile *f)
964 v = qemu_get_byte(f) << 24;
965 v |= qemu_get_byte(f) << 16;
966 v |= qemu_get_byte(f) << 8;
967 v |= qemu_get_byte(f);
971 uint64_t qemu_get_be64(QEMUFile *f)
974 v = (uint64_t)qemu_get_be32(f) << 32;
975 v |= qemu_get_be32(f);
982 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
984 uint64_t expire_time;
986 expire_time = qemu_timer_expire_time_ns(ts);
987 qemu_put_be64(f, expire_time);
990 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
992 uint64_t expire_time;
994 expire_time = qemu_get_be64(f);
995 if (expire_time != -1) {
996 qemu_mod_timer_ns(ts, expire_time);
1005 static int get_bool(QEMUFile *f, void *pv, size_t size)
1008 *v = qemu_get_byte(f);
1012 static void put_bool(QEMUFile *f, void *pv, size_t size)
1015 qemu_put_byte(f, *v);
1018 const VMStateInfo vmstate_info_bool = {
1026 static int get_int8(QEMUFile *f, void *pv, size_t size)
1033 static void put_int8(QEMUFile *f, void *pv, size_t size)
1039 const VMStateInfo vmstate_info_int8 = {
1047 static int get_int16(QEMUFile *f, void *pv, size_t size)
1050 qemu_get_sbe16s(f, v);
1054 static void put_int16(QEMUFile *f, void *pv, size_t size)
1057 qemu_put_sbe16s(f, v);
1060 const VMStateInfo vmstate_info_int16 = {
1068 static int get_int32(QEMUFile *f, void *pv, size_t size)
1071 qemu_get_sbe32s(f, v);
1075 static void put_int32(QEMUFile *f, void *pv, size_t size)
1078 qemu_put_sbe32s(f, v);
1081 const VMStateInfo vmstate_info_int32 = {
1087 /* 32 bit int. See that the received value is the same than the one
1090 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
1094 qemu_get_sbe32s(f, &v2);
1101 const VMStateInfo vmstate_info_int32_equal = {
1102 .name = "int32 equal",
1103 .get = get_int32_equal,
1107 /* 32 bit int. See that the received value is the less or the same
1108 than the one in the field */
1110 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
1114 qemu_get_sbe32s(f, &new);
1121 const VMStateInfo vmstate_info_int32_le = {
1122 .name = "int32 equal",
1123 .get = get_int32_le,
1129 static int get_int64(QEMUFile *f, void *pv, size_t size)
1132 qemu_get_sbe64s(f, v);
1136 static void put_int64(QEMUFile *f, void *pv, size_t size)
1139 qemu_put_sbe64s(f, v);
1142 const VMStateInfo vmstate_info_int64 = {
1148 /* 8 bit unsigned int */
1150 static int get_uint8(QEMUFile *f, void *pv, size_t size)
1157 static void put_uint8(QEMUFile *f, void *pv, size_t size)
1163 const VMStateInfo vmstate_info_uint8 = {
1169 /* 16 bit unsigned int */
1171 static int get_uint16(QEMUFile *f, void *pv, size_t size)
1174 qemu_get_be16s(f, v);
1178 static void put_uint16(QEMUFile *f, void *pv, size_t size)
1181 qemu_put_be16s(f, v);
1184 const VMStateInfo vmstate_info_uint16 = {
1190 /* 32 bit unsigned int */
1192 static int get_uint32(QEMUFile *f, void *pv, size_t size)
1195 qemu_get_be32s(f, v);
1199 static void put_uint32(QEMUFile *f, void *pv, size_t size)
1202 qemu_put_be32s(f, v);
1205 const VMStateInfo vmstate_info_uint32 = {
1211 /* 32 bit uint. See that the received value is the same than the one
1214 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1218 qemu_get_be32s(f, &v2);
1226 const VMStateInfo vmstate_info_uint32_equal = {
1227 .name = "uint32 equal",
1228 .get = get_uint32_equal,
1232 /* 64 bit unsigned int */
1234 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1237 qemu_get_be64s(f, v);
1241 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1244 qemu_put_be64s(f, v);
1247 const VMStateInfo vmstate_info_uint64 = {
1253 /* 64 bit unsigned int. See that the received value is the same than the one
1256 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
1260 qemu_get_be64s(f, &v2);
1268 const VMStateInfo vmstate_info_uint64_equal = {
1269 .name = "int64 equal",
1270 .get = get_uint64_equal,
1274 /* 8 bit int. See that the received value is the same than the one
1277 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1281 qemu_get_8s(f, &v2);
1288 const VMStateInfo vmstate_info_uint8_equal = {
1289 .name = "uint8 equal",
1290 .get = get_uint8_equal,
1294 /* 16 bit unsigned int int. See that the received value is the same than the one
1297 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1301 qemu_get_be16s(f, &v2);
1308 const VMStateInfo vmstate_info_uint16_equal = {
1309 .name = "uint16 equal",
1310 .get = get_uint16_equal,
1314 /* floating point */
1316 static int get_float64(QEMUFile *f, void *pv, size_t size)
1320 *v = make_float64(qemu_get_be64(f));
1324 static void put_float64(QEMUFile *f, void *pv, size_t size)
1328 qemu_put_be64(f, float64_val(*v));
1331 const VMStateInfo vmstate_info_float64 = {
1339 static int get_timer(QEMUFile *f, void *pv, size_t size)
1342 qemu_get_timer(f, v);
1346 static void put_timer(QEMUFile *f, void *pv, size_t size)
1349 qemu_put_timer(f, v);
1352 const VMStateInfo vmstate_info_timer = {
1358 /* uint8_t buffers */
1360 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1363 qemu_get_buffer(f, v, size);
1367 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1370 qemu_put_buffer(f, v, size);
1373 const VMStateInfo vmstate_info_buffer = {
1379 /* unused buffers: space that was used for some fields that are
1380 not useful anymore */
1382 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1388 block_len = MIN(sizeof(buf), size);
1390 qemu_get_buffer(f, buf, block_len);
1395 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1397 static const uint8_t buf[1024];
1401 block_len = MIN(sizeof(buf), size);
1403 qemu_put_buffer(f, buf, block_len);
1407 const VMStateInfo vmstate_info_unused_buffer = {
1408 .name = "unused_buffer",
1409 .get = get_unused_buffer,
1410 .put = put_unused_buffer,
1413 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1414 * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1415 * bit words with the bits in big endian order. The in-memory format
1416 * is an array of 'unsigned long', which may be either 32 or 64 bits.
1418 /* This is the number of 64 bit words sent over the wire */
1419 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1420 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1422 unsigned long *bmp = pv;
1424 for (i = 0; i < BITS_TO_U64S(size); i++) {
1425 uint64_t w = qemu_get_be64(f);
1427 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1428 bmp[idx++] = w >> 32;
1434 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1436 unsigned long *bmp = pv;
1438 for (i = 0; i < BITS_TO_U64S(size); i++) {
1439 uint64_t w = bmp[idx++];
1440 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1441 w |= ((uint64_t)bmp[idx++]) << 32;
1443 qemu_put_be64(f, w);
1447 const VMStateInfo vmstate_info_bitmap = {
1453 typedef struct CompatEntry {
1458 typedef struct SaveStateEntry {
1459 QTAILQ_ENTRY(SaveStateEntry) entry;
1465 SaveVMHandlers *ops;
1466 const VMStateDescription *vmsd;
1468 CompatEntry *compat;
1474 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1475 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1476 static int global_section_id;
1478 static int calculate_new_instance_id(const char *idstr)
1481 int instance_id = 0;
1483 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1484 if (strcmp(idstr, se->idstr) == 0
1485 && instance_id <= se->instance_id) {
1486 instance_id = se->instance_id + 1;
1492 static int calculate_compat_instance_id(const char *idstr)
1495 int instance_id = 0;
1497 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1501 if (strcmp(idstr, se->compat->idstr) == 0
1502 && instance_id <= se->compat->instance_id) {
1503 instance_id = se->compat->instance_id + 1;
1509 /* TODO: Individual devices generally have very little idea about the rest
1510 of the system, so instance_id should be removed/replaced.
1511 Meanwhile pass -1 as instance_id if you do not already have a clearly
1512 distinguishing id for all instances of your device class. */
1513 int register_savevm_live(DeviceState *dev,
1517 SaveVMHandlers *ops,
1522 se = g_malloc0(sizeof(SaveStateEntry));
1523 se->version_id = version_id;
1524 se->section_id = global_section_id++;
1526 se->opaque = opaque;
1529 /* if this is a live_savem then set is_ram */
1530 if (ops->save_live_setup != NULL) {
1535 char *id = qdev_get_dev_path(dev);
1537 pstrcpy(se->idstr, sizeof(se->idstr), id);
1538 pstrcat(se->idstr, sizeof(se->idstr), "/");
1541 se->compat = g_malloc0(sizeof(CompatEntry));
1542 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1543 se->compat->instance_id = instance_id == -1 ?
1544 calculate_compat_instance_id(idstr) : instance_id;
1548 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1550 if (instance_id == -1) {
1551 se->instance_id = calculate_new_instance_id(se->idstr);
1553 se->instance_id = instance_id;
1555 assert(!se->compat || se->instance_id == 0);
1556 /* add at the end of list */
1557 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1561 int register_savevm(DeviceState *dev,
1565 SaveStateHandler *save_state,
1566 LoadStateHandler *load_state,
1569 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1570 ops->save_state = save_state;
1571 ops->load_state = load_state;
1572 return register_savevm_live(dev, idstr, instance_id, version_id,
1576 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1578 SaveStateEntry *se, *new_se;
1582 char *path = qdev_get_dev_path(dev);
1584 pstrcpy(id, sizeof(id), path);
1585 pstrcat(id, sizeof(id), "/");
1589 pstrcat(id, sizeof(id), idstr);
1591 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1592 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1593 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1603 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1604 const VMStateDescription *vmsd,
1605 void *opaque, int alias_id,
1606 int required_for_version)
1610 /* If this triggers, alias support can be dropped for the vmsd. */
1611 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1613 se = g_malloc0(sizeof(SaveStateEntry));
1614 se->version_id = vmsd->version_id;
1615 se->section_id = global_section_id++;
1616 se->opaque = opaque;
1618 se->alias_id = alias_id;
1619 se->no_migrate = vmsd->unmigratable;
1622 char *id = qdev_get_dev_path(dev);
1624 pstrcpy(se->idstr, sizeof(se->idstr), id);
1625 pstrcat(se->idstr, sizeof(se->idstr), "/");
1628 se->compat = g_malloc0(sizeof(CompatEntry));
1629 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1630 se->compat->instance_id = instance_id == -1 ?
1631 calculate_compat_instance_id(vmsd->name) : instance_id;
1635 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1637 if (instance_id == -1) {
1638 se->instance_id = calculate_new_instance_id(se->idstr);
1640 se->instance_id = instance_id;
1642 assert(!se->compat || se->instance_id == 0);
1643 /* add at the end of list */
1644 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1648 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1651 SaveStateEntry *se, *new_se;
1653 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1654 if (se->vmsd == vmsd && se->opaque == opaque) {
1655 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1664 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1666 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1669 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1670 void *opaque, int version_id)
1672 VMStateField *field = vmsd->fields;
1675 if (version_id > vmsd->version_id) {
1678 if (version_id < vmsd->minimum_version_id_old) {
1681 if (version_id < vmsd->minimum_version_id) {
1682 return vmsd->load_state_old(f, opaque, version_id);
1684 if (vmsd->pre_load) {
1685 int ret = vmsd->pre_load(opaque);
1689 while(field->name) {
1690 if ((field->field_exists &&
1691 field->field_exists(opaque, version_id)) ||
1692 (!field->field_exists &&
1693 field->version_id <= version_id)) {
1694 void *base_addr = opaque + field->offset;
1696 int size = field->size;
1698 if (field->flags & VMS_VBUFFER) {
1699 size = *(int32_t *)(opaque+field->size_offset);
1700 if (field->flags & VMS_MULTIPLY) {
1701 size *= field->size;
1704 if (field->flags & VMS_ARRAY) {
1705 n_elems = field->num;
1706 } else if (field->flags & VMS_VARRAY_INT32) {
1707 n_elems = *(int32_t *)(opaque+field->num_offset);
1708 } else if (field->flags & VMS_VARRAY_UINT32) {
1709 n_elems = *(uint32_t *)(opaque+field->num_offset);
1710 } else if (field->flags & VMS_VARRAY_UINT16) {
1711 n_elems = *(uint16_t *)(opaque+field->num_offset);
1712 } else if (field->flags & VMS_VARRAY_UINT8) {
1713 n_elems = *(uint8_t *)(opaque+field->num_offset);
1715 if (field->flags & VMS_POINTER) {
1716 base_addr = *(void **)base_addr + field->start;
1718 for (i = 0; i < n_elems; i++) {
1719 void *addr = base_addr + size * i;
1721 if (field->flags & VMS_ARRAY_OF_POINTER) {
1722 addr = *(void **)addr;
1724 if (field->flags & VMS_STRUCT) {
1725 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1727 ret = field->info->get(f, addr, size);
1737 ret = vmstate_subsection_load(f, vmsd, opaque);
1741 if (vmsd->post_load) {
1742 return vmsd->post_load(opaque, version_id);
1747 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1750 VMStateField *field = vmsd->fields;
1752 if (vmsd->pre_save) {
1753 vmsd->pre_save(opaque);
1755 while(field->name) {
1756 if (!field->field_exists ||
1757 field->field_exists(opaque, vmsd->version_id)) {
1758 void *base_addr = opaque + field->offset;
1760 int size = field->size;
1762 if (field->flags & VMS_VBUFFER) {
1763 size = *(int32_t *)(opaque+field->size_offset);
1764 if (field->flags & VMS_MULTIPLY) {
1765 size *= field->size;
1768 if (field->flags & VMS_ARRAY) {
1769 n_elems = field->num;
1770 } else if (field->flags & VMS_VARRAY_INT32) {
1771 n_elems = *(int32_t *)(opaque+field->num_offset);
1772 } else if (field->flags & VMS_VARRAY_UINT32) {
1773 n_elems = *(uint32_t *)(opaque+field->num_offset);
1774 } else if (field->flags & VMS_VARRAY_UINT16) {
1775 n_elems = *(uint16_t *)(opaque+field->num_offset);
1776 } else if (field->flags & VMS_VARRAY_UINT8) {
1777 n_elems = *(uint8_t *)(opaque+field->num_offset);
1779 if (field->flags & VMS_POINTER) {
1780 base_addr = *(void **)base_addr + field->start;
1782 for (i = 0; i < n_elems; i++) {
1783 void *addr = base_addr + size * i;
1785 if (field->flags & VMS_ARRAY_OF_POINTER) {
1786 addr = *(void **)addr;
1788 if (field->flags & VMS_STRUCT) {
1789 vmstate_save_state(f, field->vmsd, addr);
1791 field->info->put(f, addr, size);
1797 vmstate_subsection_save(f, vmsd, opaque);
1800 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1802 if (!se->vmsd) { /* Old style */
1803 return se->ops->load_state(f, se->opaque, version_id);
1805 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1808 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1810 if (!se->vmsd) { /* Old style */
1811 se->ops->save_state(f, se->opaque);
1814 vmstate_save_state(f,se->vmsd, se->opaque);
1817 #define QEMU_VM_FILE_MAGIC 0x5145564d
1818 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1819 #define QEMU_VM_FILE_VERSION 0x00000003
1821 #define QEMU_VM_EOF 0x00
1822 #define QEMU_VM_SECTION_START 0x01
1823 #define QEMU_VM_SECTION_PART 0x02
1824 #define QEMU_VM_SECTION_END 0x03
1825 #define QEMU_VM_SECTION_FULL 0x04
1826 #define QEMU_VM_SUBSECTION 0x05
1828 bool qemu_savevm_state_blocked(Error **errp)
1832 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1833 if (se->no_migrate) {
1834 error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1841 void qemu_savevm_state_begin(QEMUFile *f,
1842 const MigrationParams *params)
1847 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1848 if (!se->ops || !se->ops->set_params) {
1851 se->ops->set_params(params, se->opaque);
1854 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1855 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1857 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1860 if (!se->ops || !se->ops->save_live_setup) {
1863 if (se->ops && se->ops->is_active) {
1864 if (!se->ops->is_active(se->opaque)) {
1869 qemu_put_byte(f, QEMU_VM_SECTION_START);
1870 qemu_put_be32(f, se->section_id);
1873 len = strlen(se->idstr);
1874 qemu_put_byte(f, len);
1875 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1877 qemu_put_be32(f, se->instance_id);
1878 qemu_put_be32(f, se->version_id);
1880 ret = se->ops->save_live_setup(f, se->opaque);
1882 qemu_file_set_error(f, ret);
1889 * this function has three return values:
1890 * negative: there was one error, and we have -errno.
1891 * 0 : We haven't finished, caller have to go again
1892 * 1 : We have finished, we can go to complete phase
1894 int qemu_savevm_state_iterate(QEMUFile *f)
1899 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1900 if (!se->ops || !se->ops->save_live_iterate) {
1903 if (se->ops && se->ops->is_active) {
1904 if (!se->ops->is_active(se->opaque)) {
1908 if (qemu_file_rate_limit(f)) {
1911 trace_savevm_section_start();
1913 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1914 qemu_put_be32(f, se->section_id);
1916 ret = se->ops->save_live_iterate(f, se->opaque);
1917 trace_savevm_section_end(se->section_id);
1920 qemu_file_set_error(f, ret);
1923 /* Do not proceed to the next vmstate before this one reported
1924 completion of the current stage. This serializes the migration
1925 and reduces the probability that a faster changing state is
1926 synchronized over and over again. */
1933 void qemu_savevm_state_complete(QEMUFile *f)
1938 cpu_synchronize_all_states();
1940 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1941 if (!se->ops || !se->ops->save_live_complete) {
1944 if (se->ops && se->ops->is_active) {
1945 if (!se->ops->is_active(se->opaque)) {
1949 trace_savevm_section_start();
1951 qemu_put_byte(f, QEMU_VM_SECTION_END);
1952 qemu_put_be32(f, se->section_id);
1954 ret = se->ops->save_live_complete(f, se->opaque);
1955 trace_savevm_section_end(se->section_id);
1957 qemu_file_set_error(f, ret);
1962 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1965 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1968 trace_savevm_section_start();
1970 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1971 qemu_put_be32(f, se->section_id);
1974 len = strlen(se->idstr);
1975 qemu_put_byte(f, len);
1976 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1978 qemu_put_be32(f, se->instance_id);
1979 qemu_put_be32(f, se->version_id);
1981 vmstate_save(f, se);
1982 trace_savevm_section_end(se->section_id);
1985 qemu_put_byte(f, QEMU_VM_EOF);
1989 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
1994 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1995 if (!se->ops || !se->ops->save_live_pending) {
1998 if (se->ops && se->ops->is_active) {
1999 if (!se->ops->is_active(se->opaque)) {
2003 ret += se->ops->save_live_pending(f, se->opaque, max_size);
2008 void qemu_savevm_state_cancel(void)
2012 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2013 if (se->ops && se->ops->cancel) {
2014 se->ops->cancel(se->opaque);
2019 static int qemu_savevm_state(QEMUFile *f)
2022 MigrationParams params = {
2027 if (qemu_savevm_state_blocked(NULL)) {
2031 qemu_mutex_unlock_iothread();
2032 qemu_savevm_state_begin(f, ¶ms);
2033 qemu_mutex_lock_iothread();
2035 while (qemu_file_get_error(f) == 0) {
2036 if (qemu_savevm_state_iterate(f) > 0) {
2041 ret = qemu_file_get_error(f);
2043 qemu_savevm_state_complete(f);
2044 ret = qemu_file_get_error(f);
2047 qemu_savevm_state_cancel();
2052 static int qemu_save_device_state(QEMUFile *f)
2056 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
2057 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
2059 cpu_synchronize_all_states();
2061 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2067 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
2072 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
2073 qemu_put_be32(f, se->section_id);
2076 len = strlen(se->idstr);
2077 qemu_put_byte(f, len);
2078 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
2080 qemu_put_be32(f, se->instance_id);
2081 qemu_put_be32(f, se->version_id);
2083 vmstate_save(f, se);
2086 qemu_put_byte(f, QEMU_VM_EOF);
2088 return qemu_file_get_error(f);
2091 static SaveStateEntry *find_se(const char *idstr, int instance_id)
2095 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2096 if (!strcmp(se->idstr, idstr) &&
2097 (instance_id == se->instance_id ||
2098 instance_id == se->alias_id))
2100 /* Migrating from an older version? */
2101 if (strstr(se->idstr, idstr) && se->compat) {
2102 if (!strcmp(se->compat->idstr, idstr) &&
2103 (instance_id == se->compat->instance_id ||
2104 instance_id == se->alias_id))
2111 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
2113 while(sub && sub->needed) {
2114 if (strcmp(idstr, sub->vmsd->name) == 0) {
2122 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
2125 while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
2128 uint8_t version_id, len, size;
2129 const VMStateDescription *sub_vmsd;
2131 len = qemu_peek_byte(f, 1);
2132 if (len < strlen(vmsd->name) + 1) {
2133 /* subsection name has be be "section_name/a" */
2136 size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
2142 if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
2143 /* it don't have a valid subsection name */
2146 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
2147 if (sub_vmsd == NULL) {
2150 qemu_file_skip(f, 1); /* subsection */
2151 qemu_file_skip(f, 1); /* len */
2152 qemu_file_skip(f, len); /* idstr */
2153 version_id = qemu_get_be32(f);
2155 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
2163 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
2166 const VMStateSubsection *sub = vmsd->subsections;
2168 while (sub && sub->needed) {
2169 if (sub->needed(opaque)) {
2170 const VMStateDescription *vmsd = sub->vmsd;
2173 qemu_put_byte(f, QEMU_VM_SUBSECTION);
2174 len = strlen(vmsd->name);
2175 qemu_put_byte(f, len);
2176 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
2177 qemu_put_be32(f, vmsd->version_id);
2178 vmstate_save_state(f, vmsd, opaque);
2184 typedef struct LoadStateEntry {
2185 QLIST_ENTRY(LoadStateEntry) entry;
2191 int qemu_loadvm_state(QEMUFile *f)
2193 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
2194 QLIST_HEAD_INITIALIZER(loadvm_handlers);
2195 LoadStateEntry *le, *new_le;
2196 uint8_t section_type;
2200 if (qemu_savevm_state_blocked(NULL)) {
2204 v = qemu_get_be32(f);
2205 if (v != QEMU_VM_FILE_MAGIC)
2208 v = qemu_get_be32(f);
2209 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
2210 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
2213 if (v != QEMU_VM_FILE_VERSION)
2216 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
2217 uint32_t instance_id, version_id, section_id;
2222 switch (section_type) {
2223 case QEMU_VM_SECTION_START:
2224 case QEMU_VM_SECTION_FULL:
2225 /* Read section start */
2226 section_id = qemu_get_be32(f);
2227 len = qemu_get_byte(f);
2228 qemu_get_buffer(f, (uint8_t *)idstr, len);
2230 instance_id = qemu_get_be32(f);
2231 version_id = qemu_get_be32(f);
2233 /* Find savevm section */
2234 se = find_se(idstr, instance_id);
2236 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
2241 /* Validate version */
2242 if (version_id > se->version_id) {
2243 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
2244 version_id, idstr, se->version_id);
2250 le = g_malloc0(sizeof(*le));
2253 le->section_id = section_id;
2254 le->version_id = version_id;
2255 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
2257 ret = vmstate_load(f, le->se, le->version_id);
2259 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
2260 instance_id, idstr);
2264 case QEMU_VM_SECTION_PART:
2265 case QEMU_VM_SECTION_END:
2266 section_id = qemu_get_be32(f);
2268 QLIST_FOREACH(le, &loadvm_handlers, entry) {
2269 if (le->section_id == section_id) {
2274 fprintf(stderr, "Unknown savevm section %d\n", section_id);
2279 ret = vmstate_load(f, le->se, le->version_id);
2281 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2287 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2293 cpu_synchronize_all_post_init();
2298 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2299 QLIST_REMOVE(le, entry);
2304 ret = qemu_file_get_error(f);
2310 static BlockDriverState *find_vmstate_bs(void)
2312 BlockDriverState *bs = NULL;
2313 while ((bs = bdrv_next(bs))) {
2314 if (bdrv_can_snapshot(bs)) {
2322 * Deletes snapshots of a given name in all opened images.
2324 static int del_existing_snapshots(Monitor *mon, const char *name)
2326 BlockDriverState *bs;
2327 QEMUSnapshotInfo sn1, *snapshot = &sn1;
2331 while ((bs = bdrv_next(bs))) {
2332 if (bdrv_can_snapshot(bs) &&
2333 bdrv_snapshot_find(bs, snapshot, name) >= 0)
2335 ret = bdrv_snapshot_delete(bs, name);
2338 "Error while deleting snapshot on '%s'\n",
2339 bdrv_get_device_name(bs));
2348 void do_savevm(Monitor *mon, const QDict *qdict)
2350 BlockDriverState *bs, *bs1;
2351 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2354 int saved_vm_running;
2355 uint64_t vm_state_size;
2358 const char *name = qdict_get_try_str(qdict, "name");
2360 /* Verify if there is a device that doesn't support snapshots and is writable */
2362 while ((bs = bdrv_next(bs))) {
2364 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2368 if (!bdrv_can_snapshot(bs)) {
2369 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2370 bdrv_get_device_name(bs));
2375 bs = find_vmstate_bs();
2377 monitor_printf(mon, "No block device can accept snapshots\n");
2381 saved_vm_running = runstate_is_running();
2382 vm_stop(RUN_STATE_SAVE_VM);
2384 memset(sn, 0, sizeof(*sn));
2386 /* fill auxiliary fields */
2387 qemu_gettimeofday(&tv);
2388 sn->date_sec = tv.tv_sec;
2389 sn->date_nsec = tv.tv_usec * 1000;
2390 sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2393 ret = bdrv_snapshot_find(bs, old_sn, name);
2395 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2396 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2398 pstrcpy(sn->name, sizeof(sn->name), name);
2401 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2402 localtime_r((const time_t *)&tv.tv_sec, &tm);
2403 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2406 /* Delete old snapshots of the same name */
2407 if (name && del_existing_snapshots(mon, name) < 0) {
2411 /* save the VM state */
2412 f = qemu_fopen_bdrv(bs, 1);
2414 monitor_printf(mon, "Could not open VM state file\n");
2417 ret = qemu_savevm_state(f);
2418 vm_state_size = qemu_ftell(f);
2421 monitor_printf(mon, "Error %d while writing VM\n", ret);
2425 /* create the snapshots */
2428 while ((bs1 = bdrv_next(bs1))) {
2429 if (bdrv_can_snapshot(bs1)) {
2430 /* Write VM state size only to the image that contains the state */
2431 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2432 ret = bdrv_snapshot_create(bs1, sn);
2434 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2435 bdrv_get_device_name(bs1));
2441 if (saved_vm_running)
2445 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2448 int saved_vm_running;
2451 saved_vm_running = runstate_is_running();
2452 vm_stop(RUN_STATE_SAVE_VM);
2454 f = qemu_fopen(filename, "wb");
2456 error_setg_file_open(errp, errno, filename);
2459 ret = qemu_save_device_state(f);
2462 error_set(errp, QERR_IO_ERROR);
2466 if (saved_vm_running)
2470 int load_vmstate(const char *name)
2472 BlockDriverState *bs, *bs_vm_state;
2473 QEMUSnapshotInfo sn;
2477 bs_vm_state = find_vmstate_bs();
2479 error_report("No block device supports snapshots");
2483 /* Don't even try to load empty VM states */
2484 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2487 } else if (sn.vm_state_size == 0) {
2488 error_report("This is a disk-only snapshot. Revert to it offline "
2493 /* Verify if there is any device that doesn't support snapshots and is
2494 writable and check if the requested snapshot is available too. */
2496 while ((bs = bdrv_next(bs))) {
2498 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2502 if (!bdrv_can_snapshot(bs)) {
2503 error_report("Device '%s' is writable but does not support snapshots.",
2504 bdrv_get_device_name(bs));
2508 ret = bdrv_snapshot_find(bs, &sn, name);
2510 error_report("Device '%s' does not have the requested snapshot '%s'",
2511 bdrv_get_device_name(bs), name);
2516 /* Flush all IO requests so they don't interfere with the new state. */
2520 while ((bs = bdrv_next(bs))) {
2521 if (bdrv_can_snapshot(bs)) {
2522 ret = bdrv_snapshot_goto(bs, name);
2524 error_report("Error %d while activating snapshot '%s' on '%s'",
2525 ret, name, bdrv_get_device_name(bs));
2531 /* restore the VM state */
2532 f = qemu_fopen_bdrv(bs_vm_state, 0);
2534 error_report("Could not open VM state file");
2538 qemu_system_reset(VMRESET_SILENT);
2539 ret = qemu_loadvm_state(f);
2543 error_report("Error %d while loading VM state", ret);
2550 void do_delvm(Monitor *mon, const QDict *qdict)
2552 BlockDriverState *bs, *bs1;
2554 const char *name = qdict_get_str(qdict, "name");
2556 bs = find_vmstate_bs();
2558 monitor_printf(mon, "No block device supports snapshots\n");
2563 while ((bs1 = bdrv_next(bs1))) {
2564 if (bdrv_can_snapshot(bs1)) {
2565 ret = bdrv_snapshot_delete(bs1, name);
2567 if (ret == -ENOTSUP)
2569 "Snapshots not supported on device '%s'\n",
2570 bdrv_get_device_name(bs1));
2572 monitor_printf(mon, "Error %d while deleting snapshot on "
2573 "'%s'\n", ret, bdrv_get_device_name(bs1));
2579 void do_info_snapshots(Monitor *mon, const QDict *qdict)
2581 BlockDriverState *bs, *bs1;
2582 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2583 int nb_sns, i, ret, available;
2585 int *available_snapshots;
2587 bs = find_vmstate_bs();
2589 monitor_printf(mon, "No available block device supports snapshots\n");
2593 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2595 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2600 monitor_printf(mon, "There is no snapshot available.\n");
2604 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2606 for (i = 0; i < nb_sns; i++) {
2611 while ((bs1 = bdrv_next(bs1))) {
2612 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2613 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2622 available_snapshots[total] = i;
2628 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
2629 monitor_printf(mon, "\n");
2630 for (i = 0; i < total; i++) {
2631 sn = &sn_tab[available_snapshots[i]];
2632 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
2633 monitor_printf(mon, "\n");
2636 monitor_printf(mon, "There is no suitable snapshot available\n");
2640 g_free(available_snapshots);
2644 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2646 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2647 memory_region_name(mr), dev);
2650 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2652 /* Nothing do to while the implementation is in RAMBlock */
2655 void vmstate_register_ram_global(MemoryRegion *mr)
2657 vmstate_register_ram(mr, NULL);