4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "config-host.h"
26 #include "qemu-common.h"
30 #include "monitor/monitor.h"
31 #include "sysemu/sysemu.h"
32 #include "qemu/timer.h"
33 #include "audio/audio.h"
34 #include "migration/migration.h"
35 #include "qemu/sockets.h"
36 #include "qemu/queue.h"
37 #include "sysemu/cpus.h"
38 #include "exec/memory.h"
39 #include "qmp-commands.h"
41 #include "qemu/bitops.h"
44 #define SELF_ANNOUNCE_ROUNDS 5
47 #define ETH_P_RARP 0x8035
49 #define ARP_HTYPE_ETH 0x0001
50 #define ARP_PTYPE_IP 0x0800
51 #define ARP_OP_REQUEST_REV 0x3
53 static int announce_self_create(uint8_t *buf,
56 /* Ethernet header. */
57 memset(buf, 0xff, 6); /* destination MAC addr */
58 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
59 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
62 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
63 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
64 *(buf + 18) = 6; /* hardware addr length (ethernet) */
65 *(buf + 19) = 4; /* protocol addr length (IPv4) */
66 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
67 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
68 memset(buf + 28, 0x00, 4); /* source protocol addr */
69 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
70 memset(buf + 38, 0x00, 4); /* target protocol addr */
72 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
73 memset(buf + 42, 0x00, 18);
75 return 60; /* len (FCS will be added by hardware) */
78 static void qemu_announce_self_iter(NICState *nic, void *opaque)
83 len = announce_self_create(buf, nic->conf->macaddr.a);
85 qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
89 static void qemu_announce_self_once(void *opaque)
91 static int count = SELF_ANNOUNCE_ROUNDS;
92 QEMUTimer *timer = *(QEMUTimer **)opaque;
94 qemu_foreach_nic(qemu_announce_self_iter, NULL);
97 /* delay 50ms, 150ms, 250ms, ... */
98 qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
99 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
101 qemu_del_timer(timer);
102 qemu_free_timer(timer);
106 void qemu_announce_self(void)
108 static QEMUTimer *timer;
109 timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
110 qemu_announce_self_once(&timer);
113 /***********************************************************/
114 /* savevm/loadvm support */
116 #define IO_BUF_SIZE 32768
117 #define MAX_IOV_SIZE MIN(IOV_MAX, 64)
120 const QEMUFileOps *ops;
126 int64_t pos; /* start of buffer when writing, end of buffer
129 int buf_size; /* 0 when writing */
130 uint8_t buf[IO_BUF_SIZE];
132 struct iovec iov[MAX_IOV_SIZE];
138 typedef struct QEMUFileStdio
144 typedef struct QEMUFileSocket
155 static void fd_coroutine_enter(void *opaque)
157 FDYieldUntilData *data = opaque;
158 qemu_set_fd_handler(data->fd, NULL, NULL, NULL);
159 qemu_coroutine_enter(data->co, NULL);
163 * Yield until a file descriptor becomes readable
165 * Note that this function clobbers the handlers for the file descriptor.
167 static void coroutine_fn yield_until_fd_readable(int fd)
169 FDYieldUntilData data;
171 assert(qemu_in_coroutine());
172 data.co = qemu_coroutine_self();
174 qemu_set_fd_handler(fd, fd_coroutine_enter, NULL, &data);
175 qemu_coroutine_yield();
178 static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
181 QEMUFileSocket *s = opaque;
183 ssize_t size = iov_size(iov, iovcnt);
185 len = iov_send(s->fd, iov, iovcnt, 0, size);
187 len = -socket_error();
192 static int socket_get_fd(void *opaque)
194 QEMUFileSocket *s = opaque;
199 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
201 QEMUFileSocket *s = opaque;
205 len = qemu_recv(s->fd, buf, size, 0);
209 if (socket_error() == EAGAIN) {
210 yield_until_fd_readable(s->fd);
211 } else if (socket_error() != EINTR) {
217 len = -socket_error();
222 static int socket_close(void *opaque)
224 QEMUFileSocket *s = opaque;
230 static int stdio_get_fd(void *opaque)
232 QEMUFileStdio *s = opaque;
234 return fileno(s->stdio_file);
237 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
239 QEMUFileStdio *s = opaque;
240 return fwrite(buf, 1, size, s->stdio_file);
243 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
245 QEMUFileStdio *s = opaque;
246 FILE *fp = s->stdio_file;
251 bytes = fread(buf, 1, size, fp);
252 if (bytes != 0 || !ferror(fp)) {
255 if (errno == EAGAIN) {
256 yield_until_fd_readable(fileno(fp));
257 } else if (errno != EINTR) {
264 static int stdio_pclose(void *opaque)
266 QEMUFileStdio *s = opaque;
268 ret = pclose(s->stdio_file);
271 } else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
272 /* close succeeded, but non-zero exit code: */
273 ret = -EIO; /* fake errno value */
279 static int stdio_fclose(void *opaque)
281 QEMUFileStdio *s = opaque;
284 if (s->file->ops->put_buffer || s->file->ops->writev_buffer) {
285 int fd = fileno(s->stdio_file);
288 ret = fstat(fd, &st);
289 if (ret == 0 && S_ISREG(st.st_mode)) {
291 * If the file handle is a regular file make sure the
292 * data is flushed to disk before signaling success.
301 if (fclose(s->stdio_file) == EOF) {
308 static const QEMUFileOps stdio_pipe_read_ops = {
309 .get_fd = stdio_get_fd,
310 .get_buffer = stdio_get_buffer,
311 .close = stdio_pclose
314 static const QEMUFileOps stdio_pipe_write_ops = {
315 .get_fd = stdio_get_fd,
316 .put_buffer = stdio_put_buffer,
317 .close = stdio_pclose
320 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
325 if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
326 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
330 stdio_file = popen(command, mode);
331 if (stdio_file == NULL) {
335 s = g_malloc0(sizeof(QEMUFileStdio));
337 s->stdio_file = stdio_file;
340 s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
342 s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
347 static const QEMUFileOps stdio_file_read_ops = {
348 .get_fd = stdio_get_fd,
349 .get_buffer = stdio_get_buffer,
350 .close = stdio_fclose
353 static const QEMUFileOps stdio_file_write_ops = {
354 .get_fd = stdio_get_fd,
355 .put_buffer = stdio_put_buffer,
356 .close = stdio_fclose
359 static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
362 QEMUFileSocket *s = opaque;
364 ssize_t size = iov_size(iov, iovcnt);
370 /* Find the next start position; skip all full-sized vector elements */
371 while (offset >= iov[0].iov_len) {
372 offset -= iov[0].iov_len;
376 /* skip `offset' bytes from the (now) first element, undo it on exit */
378 iov[0].iov_base += offset;
379 iov[0].iov_len -= offset;
382 len = writev(s->fd, iov, iovcnt);
383 } while (len == -1 && errno == EINTR);
388 /* Undo the changes above */
389 iov[0].iov_base -= offset;
390 iov[0].iov_len += offset;
392 /* Prepare for the next iteration */
401 static int unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
403 QEMUFileSocket *s = opaque;
407 len = read(s->fd, buf, size);
411 if (errno == EAGAIN) {
412 yield_until_fd_readable(s->fd);
413 } else if (errno != EINTR) {
424 static int unix_close(void *opaque)
426 QEMUFileSocket *s = opaque;
432 static const QEMUFileOps unix_read_ops = {
433 .get_fd = socket_get_fd,
434 .get_buffer = unix_get_buffer,
438 static const QEMUFileOps unix_write_ops = {
439 .get_fd = socket_get_fd,
440 .writev_buffer = unix_writev_buffer,
444 QEMUFile *qemu_fdopen(int fd, const char *mode)
449 (mode[0] != 'r' && mode[0] != 'w') ||
450 mode[1] != 'b' || mode[2] != 0) {
451 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
455 s = g_malloc0(sizeof(QEMUFileSocket));
459 s->file = qemu_fopen_ops(s, &unix_read_ops);
461 s->file = qemu_fopen_ops(s, &unix_write_ops);
466 static const QEMUFileOps socket_read_ops = {
467 .get_fd = socket_get_fd,
468 .get_buffer = socket_get_buffer,
469 .close = socket_close
472 static const QEMUFileOps socket_write_ops = {
473 .get_fd = socket_get_fd,
474 .writev_buffer = socket_writev_buffer,
475 .close = socket_close
478 QEMUFile *qemu_fopen_socket(int fd, const char *mode)
480 QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
483 (mode[0] != 'r' && mode[0] != 'w') ||
484 mode[1] != 'b' || mode[2] != 0) {
485 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
490 if (mode[0] == 'w') {
491 qemu_set_block(s->fd);
492 s->file = qemu_fopen_ops(s, &socket_write_ops);
494 s->file = qemu_fopen_ops(s, &socket_read_ops);
499 QEMUFile *qemu_fopen(const char *filename, const char *mode)
504 (mode[0] != 'r' && mode[0] != 'w') ||
505 mode[1] != 'b' || mode[2] != 0) {
506 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
510 s = g_malloc0(sizeof(QEMUFileStdio));
512 s->stdio_file = fopen(filename, mode);
517 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
519 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
527 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
533 qemu_iovec_init_external(&qiov, iov, iovcnt);
534 ret = bdrv_writev_vmstate(opaque, &qiov, pos);
542 static int block_put_buffer(void *opaque, const uint8_t *buf,
543 int64_t pos, int size)
545 bdrv_save_vmstate(opaque, buf, pos, size);
549 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
551 return bdrv_load_vmstate(opaque, buf, pos, size);
554 static int bdrv_fclose(void *opaque)
556 return bdrv_flush(opaque);
559 static const QEMUFileOps bdrv_read_ops = {
560 .get_buffer = block_get_buffer,
564 static const QEMUFileOps bdrv_write_ops = {
565 .put_buffer = block_put_buffer,
566 .writev_buffer = block_writev_buffer,
570 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
573 return qemu_fopen_ops(bs, &bdrv_write_ops);
574 return qemu_fopen_ops(bs, &bdrv_read_ops);
577 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
581 f = g_malloc0(sizeof(QEMUFile));
588 int qemu_file_get_error(QEMUFile *f)
590 return f->last_error;
593 static void qemu_file_set_error(QEMUFile *f, int ret)
595 if (f->last_error == 0) {
600 static inline bool qemu_file_is_writable(QEMUFile *f)
602 return f->ops->writev_buffer || f->ops->put_buffer;
606 * Flushes QEMUFile buffer
608 * If there is writev_buffer QEMUFileOps it uses it otherwise uses
611 static void qemu_fflush(QEMUFile *f)
615 if (!qemu_file_is_writable(f)) {
619 if (f->ops->writev_buffer) {
621 ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
624 if (f->buf_index > 0) {
625 ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
634 qemu_file_set_error(f, ret);
638 static void qemu_fill_buffer(QEMUFile *f)
643 assert(!qemu_file_is_writable(f));
645 pending = f->buf_size - f->buf_index;
647 memmove(f->buf, f->buf + f->buf_index, pending);
650 f->buf_size = pending;
652 len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
653 IO_BUF_SIZE - pending);
657 } else if (len == 0) {
658 qemu_file_set_error(f, -EIO);
659 } else if (len != -EAGAIN)
660 qemu_file_set_error(f, len);
663 int qemu_get_fd(QEMUFile *f)
665 if (f->ops->get_fd) {
666 return f->ops->get_fd(f->opaque);
673 * Returns negative error value if any error happened on previous operations or
674 * while closing the file. Returns 0 or positive number on success.
676 * The meaning of return value on success depends on the specific backend
679 int qemu_fclose(QEMUFile *f)
683 ret = qemu_file_get_error(f);
686 int ret2 = f->ops->close(f->opaque);
691 /* If any error was spotted before closing, we should report it
692 * instead of the close() return value.
701 static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
703 /* check for adjacent buffer and coalesce them */
704 if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
705 f->iov[f->iovcnt - 1].iov_len) {
706 f->iov[f->iovcnt - 1].iov_len += size;
708 f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
709 f->iov[f->iovcnt++].iov_len = size;
712 if (f->iovcnt >= MAX_IOV_SIZE) {
717 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size)
719 if (!f->ops->writev_buffer) {
720 qemu_put_buffer(f, buf, size);
728 f->bytes_xfer += size;
729 add_to_iovec(f, buf, size);
732 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
741 l = IO_BUF_SIZE - f->buf_index;
744 memcpy(f->buf + f->buf_index, buf, l);
745 f->bytes_xfer += size;
746 if (f->ops->writev_buffer) {
747 add_to_iovec(f, f->buf + f->buf_index, l);
750 if (f->buf_index == IO_BUF_SIZE) {
753 if (qemu_file_get_error(f)) {
761 void qemu_put_byte(QEMUFile *f, int v)
767 f->buf[f->buf_index] = v;
769 if (f->ops->writev_buffer) {
770 add_to_iovec(f, f->buf + f->buf_index, 1);
773 if (f->buf_index == IO_BUF_SIZE) {
778 static void qemu_file_skip(QEMUFile *f, int size)
780 if (f->buf_index + size <= f->buf_size) {
781 f->buf_index += size;
785 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
790 assert(!qemu_file_is_writable(f));
792 index = f->buf_index + offset;
793 pending = f->buf_size - index;
794 if (pending < size) {
796 index = f->buf_index + offset;
797 pending = f->buf_size - index;
803 if (size > pending) {
807 memcpy(buf, f->buf + index, size);
811 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
816 while (pending > 0) {
819 res = qemu_peek_buffer(f, buf, pending, 0);
823 qemu_file_skip(f, res);
831 static int qemu_peek_byte(QEMUFile *f, int offset)
833 int index = f->buf_index + offset;
835 assert(!qemu_file_is_writable(f));
837 if (index >= f->buf_size) {
839 index = f->buf_index + offset;
840 if (index >= f->buf_size) {
844 return f->buf[index];
847 int qemu_get_byte(QEMUFile *f)
851 result = qemu_peek_byte(f, 0);
852 qemu_file_skip(f, 1);
856 int64_t qemu_ftell(QEMUFile *f)
862 int qemu_file_rate_limit(QEMUFile *f)
864 if (qemu_file_get_error(f)) {
867 if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
873 int64_t qemu_file_get_rate_limit(QEMUFile *f)
875 return f->xfer_limit;
878 void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
880 f->xfer_limit = limit;
883 void qemu_file_reset_rate_limit(QEMUFile *f)
888 void qemu_put_be16(QEMUFile *f, unsigned int v)
890 qemu_put_byte(f, v >> 8);
894 void qemu_put_be32(QEMUFile *f, unsigned int v)
896 qemu_put_byte(f, v >> 24);
897 qemu_put_byte(f, v >> 16);
898 qemu_put_byte(f, v >> 8);
902 void qemu_put_be64(QEMUFile *f, uint64_t v)
904 qemu_put_be32(f, v >> 32);
908 unsigned int qemu_get_be16(QEMUFile *f)
911 v = qemu_get_byte(f) << 8;
912 v |= qemu_get_byte(f);
916 unsigned int qemu_get_be32(QEMUFile *f)
919 v = qemu_get_byte(f) << 24;
920 v |= qemu_get_byte(f) << 16;
921 v |= qemu_get_byte(f) << 8;
922 v |= qemu_get_byte(f);
926 uint64_t qemu_get_be64(QEMUFile *f)
929 v = (uint64_t)qemu_get_be32(f) << 32;
930 v |= qemu_get_be32(f);
937 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
939 uint64_t expire_time;
941 expire_time = qemu_timer_expire_time_ns(ts);
942 qemu_put_be64(f, expire_time);
945 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
947 uint64_t expire_time;
949 expire_time = qemu_get_be64(f);
950 if (expire_time != -1) {
951 qemu_mod_timer_ns(ts, expire_time);
960 static int get_bool(QEMUFile *f, void *pv, size_t size)
963 *v = qemu_get_byte(f);
967 static void put_bool(QEMUFile *f, void *pv, size_t size)
970 qemu_put_byte(f, *v);
973 const VMStateInfo vmstate_info_bool = {
981 static int get_int8(QEMUFile *f, void *pv, size_t size)
988 static void put_int8(QEMUFile *f, void *pv, size_t size)
994 const VMStateInfo vmstate_info_int8 = {
1002 static int get_int16(QEMUFile *f, void *pv, size_t size)
1005 qemu_get_sbe16s(f, v);
1009 static void put_int16(QEMUFile *f, void *pv, size_t size)
1012 qemu_put_sbe16s(f, v);
1015 const VMStateInfo vmstate_info_int16 = {
1023 static int get_int32(QEMUFile *f, void *pv, size_t size)
1026 qemu_get_sbe32s(f, v);
1030 static void put_int32(QEMUFile *f, void *pv, size_t size)
1033 qemu_put_sbe32s(f, v);
1036 const VMStateInfo vmstate_info_int32 = {
1042 /* 32 bit int. See that the received value is the same than the one
1045 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
1049 qemu_get_sbe32s(f, &v2);
1056 const VMStateInfo vmstate_info_int32_equal = {
1057 .name = "int32 equal",
1058 .get = get_int32_equal,
1062 /* 32 bit int. See that the received value is the less or the same
1063 than the one in the field */
1065 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
1069 qemu_get_sbe32s(f, &new);
1076 const VMStateInfo vmstate_info_int32_le = {
1077 .name = "int32 equal",
1078 .get = get_int32_le,
1084 static int get_int64(QEMUFile *f, void *pv, size_t size)
1087 qemu_get_sbe64s(f, v);
1091 static void put_int64(QEMUFile *f, void *pv, size_t size)
1094 qemu_put_sbe64s(f, v);
1097 const VMStateInfo vmstate_info_int64 = {
1103 /* 8 bit unsigned int */
1105 static int get_uint8(QEMUFile *f, void *pv, size_t size)
1112 static void put_uint8(QEMUFile *f, void *pv, size_t size)
1118 const VMStateInfo vmstate_info_uint8 = {
1124 /* 16 bit unsigned int */
1126 static int get_uint16(QEMUFile *f, void *pv, size_t size)
1129 qemu_get_be16s(f, v);
1133 static void put_uint16(QEMUFile *f, void *pv, size_t size)
1136 qemu_put_be16s(f, v);
1139 const VMStateInfo vmstate_info_uint16 = {
1145 /* 32 bit unsigned int */
1147 static int get_uint32(QEMUFile *f, void *pv, size_t size)
1150 qemu_get_be32s(f, v);
1154 static void put_uint32(QEMUFile *f, void *pv, size_t size)
1157 qemu_put_be32s(f, v);
1160 const VMStateInfo vmstate_info_uint32 = {
1166 /* 32 bit uint. See that the received value is the same than the one
1169 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1173 qemu_get_be32s(f, &v2);
1181 const VMStateInfo vmstate_info_uint32_equal = {
1182 .name = "uint32 equal",
1183 .get = get_uint32_equal,
1187 /* 64 bit unsigned int */
1189 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1192 qemu_get_be64s(f, v);
1196 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1199 qemu_put_be64s(f, v);
1202 const VMStateInfo vmstate_info_uint64 = {
1208 /* 64 bit unsigned int. See that the received value is the same than the one
1211 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
1215 qemu_get_be64s(f, &v2);
1223 const VMStateInfo vmstate_info_uint64_equal = {
1224 .name = "int64 equal",
1225 .get = get_uint64_equal,
1229 /* 8 bit int. See that the received value is the same than the one
1232 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1236 qemu_get_8s(f, &v2);
1243 const VMStateInfo vmstate_info_uint8_equal = {
1244 .name = "uint8 equal",
1245 .get = get_uint8_equal,
1249 /* 16 bit unsigned int int. See that the received value is the same than the one
1252 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1256 qemu_get_be16s(f, &v2);
1263 const VMStateInfo vmstate_info_uint16_equal = {
1264 .name = "uint16 equal",
1265 .get = get_uint16_equal,
1269 /* floating point */
1271 static int get_float64(QEMUFile *f, void *pv, size_t size)
1275 *v = make_float64(qemu_get_be64(f));
1279 static void put_float64(QEMUFile *f, void *pv, size_t size)
1283 qemu_put_be64(f, float64_val(*v));
1286 const VMStateInfo vmstate_info_float64 = {
1294 static int get_timer(QEMUFile *f, void *pv, size_t size)
1297 qemu_get_timer(f, v);
1301 static void put_timer(QEMUFile *f, void *pv, size_t size)
1304 qemu_put_timer(f, v);
1307 const VMStateInfo vmstate_info_timer = {
1313 /* uint8_t buffers */
1315 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1318 qemu_get_buffer(f, v, size);
1322 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1325 qemu_put_buffer(f, v, size);
1328 const VMStateInfo vmstate_info_buffer = {
1334 /* unused buffers: space that was used for some fields that are
1335 not useful anymore */
1337 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1343 block_len = MIN(sizeof(buf), size);
1345 qemu_get_buffer(f, buf, block_len);
1350 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1352 static const uint8_t buf[1024];
1356 block_len = MIN(sizeof(buf), size);
1358 qemu_put_buffer(f, buf, block_len);
1362 const VMStateInfo vmstate_info_unused_buffer = {
1363 .name = "unused_buffer",
1364 .get = get_unused_buffer,
1365 .put = put_unused_buffer,
1368 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1369 * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1370 * bit words with the bits in big endian order. The in-memory format
1371 * is an array of 'unsigned long', which may be either 32 or 64 bits.
1373 /* This is the number of 64 bit words sent over the wire */
1374 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1375 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1377 unsigned long *bmp = pv;
1379 for (i = 0; i < BITS_TO_U64S(size); i++) {
1380 uint64_t w = qemu_get_be64(f);
1382 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1383 bmp[idx++] = w >> 32;
1389 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1391 unsigned long *bmp = pv;
1393 for (i = 0; i < BITS_TO_U64S(size); i++) {
1394 uint64_t w = bmp[idx++];
1395 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1396 w |= ((uint64_t)bmp[idx++]) << 32;
1398 qemu_put_be64(f, w);
1402 const VMStateInfo vmstate_info_bitmap = {
1408 typedef struct CompatEntry {
1413 typedef struct SaveStateEntry {
1414 QTAILQ_ENTRY(SaveStateEntry) entry;
1420 SaveVMHandlers *ops;
1421 const VMStateDescription *vmsd;
1423 CompatEntry *compat;
1429 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1430 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1431 static int global_section_id;
1433 static int calculate_new_instance_id(const char *idstr)
1436 int instance_id = 0;
1438 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1439 if (strcmp(idstr, se->idstr) == 0
1440 && instance_id <= se->instance_id) {
1441 instance_id = se->instance_id + 1;
1447 static int calculate_compat_instance_id(const char *idstr)
1450 int instance_id = 0;
1452 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1456 if (strcmp(idstr, se->compat->idstr) == 0
1457 && instance_id <= se->compat->instance_id) {
1458 instance_id = se->compat->instance_id + 1;
1464 /* TODO: Individual devices generally have very little idea about the rest
1465 of the system, so instance_id should be removed/replaced.
1466 Meanwhile pass -1 as instance_id if you do not already have a clearly
1467 distinguishing id for all instances of your device class. */
1468 int register_savevm_live(DeviceState *dev,
1472 SaveVMHandlers *ops,
1477 se = g_malloc0(sizeof(SaveStateEntry));
1478 se->version_id = version_id;
1479 se->section_id = global_section_id++;
1481 se->opaque = opaque;
1484 /* if this is a live_savem then set is_ram */
1485 if (ops->save_live_setup != NULL) {
1490 char *id = qdev_get_dev_path(dev);
1492 pstrcpy(se->idstr, sizeof(se->idstr), id);
1493 pstrcat(se->idstr, sizeof(se->idstr), "/");
1496 se->compat = g_malloc0(sizeof(CompatEntry));
1497 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1498 se->compat->instance_id = instance_id == -1 ?
1499 calculate_compat_instance_id(idstr) : instance_id;
1503 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1505 if (instance_id == -1) {
1506 se->instance_id = calculate_new_instance_id(se->idstr);
1508 se->instance_id = instance_id;
1510 assert(!se->compat || se->instance_id == 0);
1511 /* add at the end of list */
1512 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1516 int register_savevm(DeviceState *dev,
1520 SaveStateHandler *save_state,
1521 LoadStateHandler *load_state,
1524 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1525 ops->save_state = save_state;
1526 ops->load_state = load_state;
1527 return register_savevm_live(dev, idstr, instance_id, version_id,
1531 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1533 SaveStateEntry *se, *new_se;
1537 char *path = qdev_get_dev_path(dev);
1539 pstrcpy(id, sizeof(id), path);
1540 pstrcat(id, sizeof(id), "/");
1544 pstrcat(id, sizeof(id), idstr);
1546 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1547 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1548 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1558 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1559 const VMStateDescription *vmsd,
1560 void *opaque, int alias_id,
1561 int required_for_version)
1565 /* If this triggers, alias support can be dropped for the vmsd. */
1566 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1568 se = g_malloc0(sizeof(SaveStateEntry));
1569 se->version_id = vmsd->version_id;
1570 se->section_id = global_section_id++;
1571 se->opaque = opaque;
1573 se->alias_id = alias_id;
1574 se->no_migrate = vmsd->unmigratable;
1577 char *id = qdev_get_dev_path(dev);
1579 pstrcpy(se->idstr, sizeof(se->idstr), id);
1580 pstrcat(se->idstr, sizeof(se->idstr), "/");
1583 se->compat = g_malloc0(sizeof(CompatEntry));
1584 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1585 se->compat->instance_id = instance_id == -1 ?
1586 calculate_compat_instance_id(vmsd->name) : instance_id;
1590 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1592 if (instance_id == -1) {
1593 se->instance_id = calculate_new_instance_id(se->idstr);
1595 se->instance_id = instance_id;
1597 assert(!se->compat || se->instance_id == 0);
1598 /* add at the end of list */
1599 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1603 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1606 SaveStateEntry *se, *new_se;
1608 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1609 if (se->vmsd == vmsd && se->opaque == opaque) {
1610 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1619 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1621 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1624 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1625 void *opaque, int version_id)
1627 VMStateField *field = vmsd->fields;
1630 if (version_id > vmsd->version_id) {
1633 if (version_id < vmsd->minimum_version_id_old) {
1636 if (version_id < vmsd->minimum_version_id) {
1637 return vmsd->load_state_old(f, opaque, version_id);
1639 if (vmsd->pre_load) {
1640 int ret = vmsd->pre_load(opaque);
1644 while(field->name) {
1645 if ((field->field_exists &&
1646 field->field_exists(opaque, version_id)) ||
1647 (!field->field_exists &&
1648 field->version_id <= version_id)) {
1649 void *base_addr = opaque + field->offset;
1651 int size = field->size;
1653 if (field->flags & VMS_VBUFFER) {
1654 size = *(int32_t *)(opaque+field->size_offset);
1655 if (field->flags & VMS_MULTIPLY) {
1656 size *= field->size;
1659 if (field->flags & VMS_ARRAY) {
1660 n_elems = field->num;
1661 } else if (field->flags & VMS_VARRAY_INT32) {
1662 n_elems = *(int32_t *)(opaque+field->num_offset);
1663 } else if (field->flags & VMS_VARRAY_UINT32) {
1664 n_elems = *(uint32_t *)(opaque+field->num_offset);
1665 } else if (field->flags & VMS_VARRAY_UINT16) {
1666 n_elems = *(uint16_t *)(opaque+field->num_offset);
1667 } else if (field->flags & VMS_VARRAY_UINT8) {
1668 n_elems = *(uint8_t *)(opaque+field->num_offset);
1670 if (field->flags & VMS_POINTER) {
1671 base_addr = *(void **)base_addr + field->start;
1673 for (i = 0; i < n_elems; i++) {
1674 void *addr = base_addr + size * i;
1676 if (field->flags & VMS_ARRAY_OF_POINTER) {
1677 addr = *(void **)addr;
1679 if (field->flags & VMS_STRUCT) {
1680 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1682 ret = field->info->get(f, addr, size);
1692 ret = vmstate_subsection_load(f, vmsd, opaque);
1696 if (vmsd->post_load) {
1697 return vmsd->post_load(opaque, version_id);
1702 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1705 VMStateField *field = vmsd->fields;
1707 if (vmsd->pre_save) {
1708 vmsd->pre_save(opaque);
1710 while(field->name) {
1711 if (!field->field_exists ||
1712 field->field_exists(opaque, vmsd->version_id)) {
1713 void *base_addr = opaque + field->offset;
1715 int size = field->size;
1717 if (field->flags & VMS_VBUFFER) {
1718 size = *(int32_t *)(opaque+field->size_offset);
1719 if (field->flags & VMS_MULTIPLY) {
1720 size *= field->size;
1723 if (field->flags & VMS_ARRAY) {
1724 n_elems = field->num;
1725 } else if (field->flags & VMS_VARRAY_INT32) {
1726 n_elems = *(int32_t *)(opaque+field->num_offset);
1727 } else if (field->flags & VMS_VARRAY_UINT32) {
1728 n_elems = *(uint32_t *)(opaque+field->num_offset);
1729 } else if (field->flags & VMS_VARRAY_UINT16) {
1730 n_elems = *(uint16_t *)(opaque+field->num_offset);
1731 } else if (field->flags & VMS_VARRAY_UINT8) {
1732 n_elems = *(uint8_t *)(opaque+field->num_offset);
1734 if (field->flags & VMS_POINTER) {
1735 base_addr = *(void **)base_addr + field->start;
1737 for (i = 0; i < n_elems; i++) {
1738 void *addr = base_addr + size * i;
1740 if (field->flags & VMS_ARRAY_OF_POINTER) {
1741 addr = *(void **)addr;
1743 if (field->flags & VMS_STRUCT) {
1744 vmstate_save_state(f, field->vmsd, addr);
1746 field->info->put(f, addr, size);
1752 vmstate_subsection_save(f, vmsd, opaque);
1755 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1757 if (!se->vmsd) { /* Old style */
1758 return se->ops->load_state(f, se->opaque, version_id);
1760 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1763 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1765 if (!se->vmsd) { /* Old style */
1766 se->ops->save_state(f, se->opaque);
1769 vmstate_save_state(f,se->vmsd, se->opaque);
1772 #define QEMU_VM_FILE_MAGIC 0x5145564d
1773 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1774 #define QEMU_VM_FILE_VERSION 0x00000003
1776 #define QEMU_VM_EOF 0x00
1777 #define QEMU_VM_SECTION_START 0x01
1778 #define QEMU_VM_SECTION_PART 0x02
1779 #define QEMU_VM_SECTION_END 0x03
1780 #define QEMU_VM_SECTION_FULL 0x04
1781 #define QEMU_VM_SUBSECTION 0x05
1783 bool qemu_savevm_state_blocked(Error **errp)
1787 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1788 if (se->no_migrate) {
1789 error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1796 void qemu_savevm_state_begin(QEMUFile *f,
1797 const MigrationParams *params)
1802 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1803 if (!se->ops || !se->ops->set_params) {
1806 se->ops->set_params(params, se->opaque);
1809 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1810 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1812 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1815 if (!se->ops || !se->ops->save_live_setup) {
1818 if (se->ops && se->ops->is_active) {
1819 if (!se->ops->is_active(se->opaque)) {
1824 qemu_put_byte(f, QEMU_VM_SECTION_START);
1825 qemu_put_be32(f, se->section_id);
1828 len = strlen(se->idstr);
1829 qemu_put_byte(f, len);
1830 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1832 qemu_put_be32(f, se->instance_id);
1833 qemu_put_be32(f, se->version_id);
1835 ret = se->ops->save_live_setup(f, se->opaque);
1837 qemu_file_set_error(f, ret);
1844 * this function has three return values:
1845 * negative: there was one error, and we have -errno.
1846 * 0 : We haven't finished, caller have to go again
1847 * 1 : We have finished, we can go to complete phase
1849 int qemu_savevm_state_iterate(QEMUFile *f)
1854 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1855 if (!se->ops || !se->ops->save_live_iterate) {
1858 if (se->ops && se->ops->is_active) {
1859 if (!se->ops->is_active(se->opaque)) {
1863 if (qemu_file_rate_limit(f)) {
1866 trace_savevm_section_start();
1868 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1869 qemu_put_be32(f, se->section_id);
1871 ret = se->ops->save_live_iterate(f, se->opaque);
1872 trace_savevm_section_end(se->section_id);
1875 qemu_file_set_error(f, ret);
1878 /* Do not proceed to the next vmstate before this one reported
1879 completion of the current stage. This serializes the migration
1880 and reduces the probability that a faster changing state is
1881 synchronized over and over again. */
1888 void qemu_savevm_state_complete(QEMUFile *f)
1893 cpu_synchronize_all_states();
1895 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1896 if (!se->ops || !se->ops->save_live_complete) {
1899 if (se->ops && se->ops->is_active) {
1900 if (!se->ops->is_active(se->opaque)) {
1904 trace_savevm_section_start();
1906 qemu_put_byte(f, QEMU_VM_SECTION_END);
1907 qemu_put_be32(f, se->section_id);
1909 ret = se->ops->save_live_complete(f, se->opaque);
1910 trace_savevm_section_end(se->section_id);
1912 qemu_file_set_error(f, ret);
1917 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1920 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1923 trace_savevm_section_start();
1925 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1926 qemu_put_be32(f, se->section_id);
1929 len = strlen(se->idstr);
1930 qemu_put_byte(f, len);
1931 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1933 qemu_put_be32(f, se->instance_id);
1934 qemu_put_be32(f, se->version_id);
1936 vmstate_save(f, se);
1937 trace_savevm_section_end(se->section_id);
1940 qemu_put_byte(f, QEMU_VM_EOF);
1944 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
1949 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1950 if (!se->ops || !se->ops->save_live_pending) {
1953 if (se->ops && se->ops->is_active) {
1954 if (!se->ops->is_active(se->opaque)) {
1958 ret += se->ops->save_live_pending(f, se->opaque, max_size);
1963 void qemu_savevm_state_cancel(void)
1967 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1968 if (se->ops && se->ops->cancel) {
1969 se->ops->cancel(se->opaque);
1974 static int qemu_savevm_state(QEMUFile *f)
1977 MigrationParams params = {
1982 if (qemu_savevm_state_blocked(NULL)) {
1986 qemu_mutex_unlock_iothread();
1987 qemu_savevm_state_begin(f, ¶ms);
1988 qemu_mutex_lock_iothread();
1990 while (qemu_file_get_error(f) == 0) {
1991 if (qemu_savevm_state_iterate(f) > 0) {
1996 ret = qemu_file_get_error(f);
1998 qemu_savevm_state_complete(f);
1999 ret = qemu_file_get_error(f);
2002 qemu_savevm_state_cancel();
2007 static int qemu_save_device_state(QEMUFile *f)
2011 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
2012 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
2014 cpu_synchronize_all_states();
2016 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2022 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
2027 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
2028 qemu_put_be32(f, se->section_id);
2031 len = strlen(se->idstr);
2032 qemu_put_byte(f, len);
2033 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
2035 qemu_put_be32(f, se->instance_id);
2036 qemu_put_be32(f, se->version_id);
2038 vmstate_save(f, se);
2041 qemu_put_byte(f, QEMU_VM_EOF);
2043 return qemu_file_get_error(f);
2046 static SaveStateEntry *find_se(const char *idstr, int instance_id)
2050 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
2051 if (!strcmp(se->idstr, idstr) &&
2052 (instance_id == se->instance_id ||
2053 instance_id == se->alias_id))
2055 /* Migrating from an older version? */
2056 if (strstr(se->idstr, idstr) && se->compat) {
2057 if (!strcmp(se->compat->idstr, idstr) &&
2058 (instance_id == se->compat->instance_id ||
2059 instance_id == se->alias_id))
2066 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
2068 while(sub && sub->needed) {
2069 if (strcmp(idstr, sub->vmsd->name) == 0) {
2077 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
2080 while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
2083 uint8_t version_id, len, size;
2084 const VMStateDescription *sub_vmsd;
2086 len = qemu_peek_byte(f, 1);
2087 if (len < strlen(vmsd->name) + 1) {
2088 /* subsection name has be be "section_name/a" */
2091 size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
2097 if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
2098 /* it don't have a valid subsection name */
2101 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
2102 if (sub_vmsd == NULL) {
2105 qemu_file_skip(f, 1); /* subsection */
2106 qemu_file_skip(f, 1); /* len */
2107 qemu_file_skip(f, len); /* idstr */
2108 version_id = qemu_get_be32(f);
2110 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
2118 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
2121 const VMStateSubsection *sub = vmsd->subsections;
2123 while (sub && sub->needed) {
2124 if (sub->needed(opaque)) {
2125 const VMStateDescription *vmsd = sub->vmsd;
2128 qemu_put_byte(f, QEMU_VM_SUBSECTION);
2129 len = strlen(vmsd->name);
2130 qemu_put_byte(f, len);
2131 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
2132 qemu_put_be32(f, vmsd->version_id);
2133 vmstate_save_state(f, vmsd, opaque);
2139 typedef struct LoadStateEntry {
2140 QLIST_ENTRY(LoadStateEntry) entry;
2146 int qemu_loadvm_state(QEMUFile *f)
2148 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
2149 QLIST_HEAD_INITIALIZER(loadvm_handlers);
2150 LoadStateEntry *le, *new_le;
2151 uint8_t section_type;
2155 if (qemu_savevm_state_blocked(NULL)) {
2159 v = qemu_get_be32(f);
2160 if (v != QEMU_VM_FILE_MAGIC)
2163 v = qemu_get_be32(f);
2164 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
2165 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
2168 if (v != QEMU_VM_FILE_VERSION)
2171 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
2172 uint32_t instance_id, version_id, section_id;
2177 switch (section_type) {
2178 case QEMU_VM_SECTION_START:
2179 case QEMU_VM_SECTION_FULL:
2180 /* Read section start */
2181 section_id = qemu_get_be32(f);
2182 len = qemu_get_byte(f);
2183 qemu_get_buffer(f, (uint8_t *)idstr, len);
2185 instance_id = qemu_get_be32(f);
2186 version_id = qemu_get_be32(f);
2188 /* Find savevm section */
2189 se = find_se(idstr, instance_id);
2191 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
2196 /* Validate version */
2197 if (version_id > se->version_id) {
2198 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
2199 version_id, idstr, se->version_id);
2205 le = g_malloc0(sizeof(*le));
2208 le->section_id = section_id;
2209 le->version_id = version_id;
2210 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
2212 ret = vmstate_load(f, le->se, le->version_id);
2214 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
2215 instance_id, idstr);
2219 case QEMU_VM_SECTION_PART:
2220 case QEMU_VM_SECTION_END:
2221 section_id = qemu_get_be32(f);
2223 QLIST_FOREACH(le, &loadvm_handlers, entry) {
2224 if (le->section_id == section_id) {
2229 fprintf(stderr, "Unknown savevm section %d\n", section_id);
2234 ret = vmstate_load(f, le->se, le->version_id);
2236 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2242 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2248 cpu_synchronize_all_post_init();
2253 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2254 QLIST_REMOVE(le, entry);
2259 ret = qemu_file_get_error(f);
2265 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
2268 QEMUSnapshotInfo *sn_tab, *sn;
2272 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2275 for(i = 0; i < nb_sns; i++) {
2277 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2288 * Deletes snapshots of a given name in all opened images.
2290 static int del_existing_snapshots(Monitor *mon, const char *name)
2292 BlockDriverState *bs;
2293 QEMUSnapshotInfo sn1, *snapshot = &sn1;
2297 while ((bs = bdrv_next(bs))) {
2298 if (bdrv_can_snapshot(bs) &&
2299 bdrv_snapshot_find(bs, snapshot, name) >= 0)
2301 ret = bdrv_snapshot_delete(bs, name);
2304 "Error while deleting snapshot on '%s'\n",
2305 bdrv_get_device_name(bs));
2314 void do_savevm(Monitor *mon, const QDict *qdict)
2316 BlockDriverState *bs, *bs1;
2317 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2320 int saved_vm_running;
2321 uint64_t vm_state_size;
2324 const char *name = qdict_get_try_str(qdict, "name");
2326 /* Verify if there is a device that doesn't support snapshots and is writable */
2328 while ((bs = bdrv_next(bs))) {
2330 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2334 if (!bdrv_can_snapshot(bs)) {
2335 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2336 bdrv_get_device_name(bs));
2341 bs = bdrv_snapshots();
2343 monitor_printf(mon, "No block device can accept snapshots\n");
2347 saved_vm_running = runstate_is_running();
2348 vm_stop(RUN_STATE_SAVE_VM);
2350 memset(sn, 0, sizeof(*sn));
2352 /* fill auxiliary fields */
2353 qemu_gettimeofday(&tv);
2354 sn->date_sec = tv.tv_sec;
2355 sn->date_nsec = tv.tv_usec * 1000;
2356 sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2359 ret = bdrv_snapshot_find(bs, old_sn, name);
2361 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2362 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2364 pstrcpy(sn->name, sizeof(sn->name), name);
2367 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2368 localtime_r((const time_t *)&tv.tv_sec, &tm);
2369 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2372 /* Delete old snapshots of the same name */
2373 if (name && del_existing_snapshots(mon, name) < 0) {
2377 /* save the VM state */
2378 f = qemu_fopen_bdrv(bs, 1);
2380 monitor_printf(mon, "Could not open VM state file\n");
2383 ret = qemu_savevm_state(f);
2384 vm_state_size = qemu_ftell(f);
2387 monitor_printf(mon, "Error %d while writing VM\n", ret);
2391 /* create the snapshots */
2394 while ((bs1 = bdrv_next(bs1))) {
2395 if (bdrv_can_snapshot(bs1)) {
2396 /* Write VM state size only to the image that contains the state */
2397 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2398 ret = bdrv_snapshot_create(bs1, sn);
2400 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2401 bdrv_get_device_name(bs1));
2407 if (saved_vm_running)
2411 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2414 int saved_vm_running;
2417 saved_vm_running = runstate_is_running();
2418 vm_stop(RUN_STATE_SAVE_VM);
2420 f = qemu_fopen(filename, "wb");
2422 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2425 ret = qemu_save_device_state(f);
2428 error_set(errp, QERR_IO_ERROR);
2432 if (saved_vm_running)
2436 int load_vmstate(const char *name)
2438 BlockDriverState *bs, *bs_vm_state;
2439 QEMUSnapshotInfo sn;
2443 bs_vm_state = bdrv_snapshots();
2445 error_report("No block device supports snapshots");
2449 /* Don't even try to load empty VM states */
2450 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2453 } else if (sn.vm_state_size == 0) {
2454 error_report("This is a disk-only snapshot. Revert to it offline "
2459 /* Verify if there is any device that doesn't support snapshots and is
2460 writable and check if the requested snapshot is available too. */
2462 while ((bs = bdrv_next(bs))) {
2464 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2468 if (!bdrv_can_snapshot(bs)) {
2469 error_report("Device '%s' is writable but does not support snapshots.",
2470 bdrv_get_device_name(bs));
2474 ret = bdrv_snapshot_find(bs, &sn, name);
2476 error_report("Device '%s' does not have the requested snapshot '%s'",
2477 bdrv_get_device_name(bs), name);
2482 /* Flush all IO requests so they don't interfere with the new state. */
2486 while ((bs = bdrv_next(bs))) {
2487 if (bdrv_can_snapshot(bs)) {
2488 ret = bdrv_snapshot_goto(bs, name);
2490 error_report("Error %d while activating snapshot '%s' on '%s'",
2491 ret, name, bdrv_get_device_name(bs));
2497 /* restore the VM state */
2498 f = qemu_fopen_bdrv(bs_vm_state, 0);
2500 error_report("Could not open VM state file");
2504 qemu_system_reset(VMRESET_SILENT);
2505 ret = qemu_loadvm_state(f);
2509 error_report("Error %d while loading VM state", ret);
2516 void do_delvm(Monitor *mon, const QDict *qdict)
2518 BlockDriverState *bs, *bs1;
2520 const char *name = qdict_get_str(qdict, "name");
2522 bs = bdrv_snapshots();
2524 monitor_printf(mon, "No block device supports snapshots\n");
2529 while ((bs1 = bdrv_next(bs1))) {
2530 if (bdrv_can_snapshot(bs1)) {
2531 ret = bdrv_snapshot_delete(bs1, name);
2533 if (ret == -ENOTSUP)
2535 "Snapshots not supported on device '%s'\n",
2536 bdrv_get_device_name(bs1));
2538 monitor_printf(mon, "Error %d while deleting snapshot on "
2539 "'%s'\n", ret, bdrv_get_device_name(bs1));
2545 void do_info_snapshots(Monitor *mon, const QDict *qdict)
2547 BlockDriverState *bs, *bs1;
2548 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2549 int nb_sns, i, ret, available;
2551 int *available_snapshots;
2554 bs = bdrv_snapshots();
2556 monitor_printf(mon, "No available block device supports snapshots\n");
2560 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2562 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2567 monitor_printf(mon, "There is no snapshot available.\n");
2571 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2573 for (i = 0; i < nb_sns; i++) {
2578 while ((bs1 = bdrv_next(bs1))) {
2579 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2580 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2589 available_snapshots[total] = i;
2595 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2596 for (i = 0; i < total; i++) {
2597 sn = &sn_tab[available_snapshots[i]];
2598 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2601 monitor_printf(mon, "There is no suitable snapshot available\n");
2605 g_free(available_snapshots);
2609 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2611 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2612 memory_region_name(mr), dev);
2615 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2617 /* Nothing do to while the implementation is in RAMBlock */
2620 void vmstate_register_ram_global(MemoryRegion *mr)
2622 vmstate_register_ram(mr, NULL);