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 #define SELF_ANNOUNCE_ROUNDS 5
46 #define ETH_P_RARP 0x8035
48 #define ARP_HTYPE_ETH 0x0001
49 #define ARP_PTYPE_IP 0x0800
50 #define ARP_OP_REQUEST_REV 0x3
52 static int announce_self_create(uint8_t *buf,
55 /* Ethernet header. */
56 memset(buf, 0xff, 6); /* destination MAC addr */
57 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
58 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
61 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
62 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
63 *(buf + 18) = 6; /* hardware addr length (ethernet) */
64 *(buf + 19) = 4; /* protocol addr length (IPv4) */
65 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
66 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
67 memset(buf + 28, 0x00, 4); /* source protocol addr */
68 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
69 memset(buf + 38, 0x00, 4); /* target protocol addr */
71 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
72 memset(buf + 42, 0x00, 18);
74 return 60; /* len (FCS will be added by hardware) */
77 static void qemu_announce_self_iter(NICState *nic, void *opaque)
82 len = announce_self_create(buf, nic->conf->macaddr.a);
84 qemu_send_packet_raw(&nic->nc, buf, len);
88 static void qemu_announce_self_once(void *opaque)
90 static int count = SELF_ANNOUNCE_ROUNDS;
91 QEMUTimer *timer = *(QEMUTimer **)opaque;
93 qemu_foreach_nic(qemu_announce_self_iter, NULL);
96 /* delay 50ms, 150ms, 250ms, ... */
97 qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
98 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
100 qemu_del_timer(timer);
101 qemu_free_timer(timer);
105 void qemu_announce_self(void)
107 static QEMUTimer *timer;
108 timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
109 qemu_announce_self_once(&timer);
112 /***********************************************************/
113 /* savevm/loadvm support */
115 #define IO_BUF_SIZE 32768
118 const QEMUFileOps *ops;
122 int64_t buf_offset; /* start of buffer when writing, end of buffer
125 int buf_size; /* 0 when writing */
126 uint8_t buf[IO_BUF_SIZE];
131 typedef struct QEMUFileStdio
137 typedef struct QEMUFileSocket
143 static int socket_get_fd(void *opaque)
145 QEMUFileSocket *s = opaque;
150 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
152 QEMUFileSocket *s = opaque;
156 len = qemu_recv(s->fd, buf, size, 0);
160 if (socket_error() == EAGAIN) {
161 assert(qemu_in_coroutine());
162 qemu_coroutine_yield();
163 } else if (socket_error() != EINTR) {
169 len = -socket_error();
174 static int socket_close(void *opaque)
176 QEMUFileSocket *s = opaque;
182 static int stdio_get_fd(void *opaque)
184 QEMUFileStdio *s = opaque;
186 return fileno(s->stdio_file);
189 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
191 QEMUFileStdio *s = opaque;
192 return fwrite(buf, 1, size, s->stdio_file);
195 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
197 QEMUFileStdio *s = opaque;
198 FILE *fp = s->stdio_file;
203 bytes = fread(buf, 1, size, fp);
204 if (bytes != 0 || !ferror(fp)) {
207 if (errno == EAGAIN) {
208 assert(qemu_in_coroutine());
209 qemu_coroutine_yield();
210 } else if (errno != EINTR) {
217 static int stdio_pclose(void *opaque)
219 QEMUFileStdio *s = opaque;
221 ret = pclose(s->stdio_file);
229 static int stdio_fclose(void *opaque)
231 QEMUFileStdio *s = opaque;
233 if (fclose(s->stdio_file) == EOF) {
240 static const QEMUFileOps stdio_pipe_read_ops = {
241 .get_fd = stdio_get_fd,
242 .get_buffer = stdio_get_buffer,
243 .close = stdio_pclose
246 static const QEMUFileOps stdio_pipe_write_ops = {
247 .get_fd = stdio_get_fd,
248 .put_buffer = stdio_put_buffer,
249 .close = stdio_pclose
252 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
256 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
257 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
261 s = g_malloc0(sizeof(QEMUFileStdio));
263 s->stdio_file = stdio_file;
266 s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
268 s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
273 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
277 popen_file = popen(command, mode);
278 if(popen_file == NULL) {
282 return qemu_popen(popen_file, mode);
285 static const QEMUFileOps stdio_file_read_ops = {
286 .get_fd = stdio_get_fd,
287 .get_buffer = stdio_get_buffer,
288 .close = stdio_fclose
291 static const QEMUFileOps stdio_file_write_ops = {
292 .get_fd = stdio_get_fd,
293 .put_buffer = stdio_put_buffer,
294 .close = stdio_fclose
297 QEMUFile *qemu_fdopen(int fd, const char *mode)
302 (mode[0] != 'r' && mode[0] != 'w') ||
303 mode[1] != 'b' || mode[2] != 0) {
304 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
308 s = g_malloc0(sizeof(QEMUFileStdio));
309 s->stdio_file = fdopen(fd, mode);
314 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
316 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
325 static const QEMUFileOps socket_read_ops = {
326 .get_fd = socket_get_fd,
327 .get_buffer = socket_get_buffer,
328 .close = socket_close
331 QEMUFile *qemu_fopen_socket(int fd)
333 QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
336 s->file = qemu_fopen_ops(s, &socket_read_ops);
340 QEMUFile *qemu_fopen(const char *filename, const char *mode)
345 (mode[0] != 'r' && mode[0] != 'w') ||
346 mode[1] != 'b' || mode[2] != 0) {
347 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
351 s = g_malloc0(sizeof(QEMUFileStdio));
353 s->stdio_file = fopen(filename, mode);
358 s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
360 s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
368 static int block_put_buffer(void *opaque, const uint8_t *buf,
369 int64_t pos, int size)
371 bdrv_save_vmstate(opaque, buf, pos, size);
375 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
377 return bdrv_load_vmstate(opaque, buf, pos, size);
380 static int bdrv_fclose(void *opaque)
382 return bdrv_flush(opaque);
385 static const QEMUFileOps bdrv_read_ops = {
386 .get_buffer = block_get_buffer,
390 static const QEMUFileOps bdrv_write_ops = {
391 .put_buffer = block_put_buffer,
395 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
398 return qemu_fopen_ops(bs, &bdrv_write_ops);
399 return qemu_fopen_ops(bs, &bdrv_read_ops);
402 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
406 f = g_malloc0(sizeof(QEMUFile));
415 int qemu_file_get_error(QEMUFile *f)
417 return f->last_error;
420 static void qemu_file_set_error(QEMUFile *f, int ret)
425 /** Flushes QEMUFile buffer
428 static int qemu_fflush(QEMUFile *f)
432 if (!f->ops->put_buffer)
435 if (f->is_write && f->buf_index > 0) {
436 ret = f->ops->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
438 f->buf_offset += f->buf_index;
445 static void qemu_fill_buffer(QEMUFile *f)
450 if (!f->ops->get_buffer)
456 pending = f->buf_size - f->buf_index;
458 memmove(f->buf, f->buf + f->buf_index, pending);
461 f->buf_size = pending;
463 len = f->ops->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
464 IO_BUF_SIZE - pending);
467 f->buf_offset += len;
468 } else if (len == 0) {
469 qemu_file_set_error(f, -EIO);
470 } else if (len != -EAGAIN)
471 qemu_file_set_error(f, len);
474 int qemu_get_fd(QEMUFile *f)
476 if (f->ops->get_fd) {
477 return f->ops->get_fd(f->opaque);
484 * Returns negative error value if any error happened on previous operations or
485 * while closing the file. Returns 0 or positive number on success.
487 * The meaning of return value on success depends on the specific backend
490 int qemu_fclose(QEMUFile *f)
493 ret = qemu_fflush(f);
496 int ret2 = f->ops->close(f->opaque);
501 /* If any error was spotted before closing, we should report it
502 * instead of the close() return value.
511 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
519 if (f->is_write == 0 && f->buf_index > 0) {
521 "Attempted to write to buffer while read buffer is not empty\n");
526 l = IO_BUF_SIZE - f->buf_index;
529 memcpy(f->buf + f->buf_index, buf, l);
534 if (f->buf_index >= IO_BUF_SIZE) {
535 int ret = qemu_fflush(f);
537 qemu_file_set_error(f, ret);
544 void qemu_put_byte(QEMUFile *f, int v)
550 if (f->is_write == 0 && f->buf_index > 0) {
552 "Attempted to write to buffer while read buffer is not empty\n");
556 f->buf[f->buf_index++] = v;
558 if (f->buf_index >= IO_BUF_SIZE) {
559 int ret = qemu_fflush(f);
561 qemu_file_set_error(f, ret);
566 static void qemu_file_skip(QEMUFile *f, int size)
568 if (f->buf_index + size <= f->buf_size) {
569 f->buf_index += size;
573 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
582 index = f->buf_index + offset;
583 pending = f->buf_size - index;
584 if (pending < size) {
586 index = f->buf_index + offset;
587 pending = f->buf_size - index;
593 if (size > pending) {
597 memcpy(buf, f->buf + index, size);
601 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
606 while (pending > 0) {
609 res = qemu_peek_buffer(f, buf, pending, 0);
613 qemu_file_skip(f, res);
621 static int qemu_peek_byte(QEMUFile *f, int offset)
623 int index = f->buf_index + offset;
629 if (index >= f->buf_size) {
631 index = f->buf_index + offset;
632 if (index >= f->buf_size) {
636 return f->buf[index];
639 int qemu_get_byte(QEMUFile *f)
643 result = qemu_peek_byte(f, 0);
644 qemu_file_skip(f, 1);
648 static int64_t qemu_ftell(QEMUFile *f)
650 return f->buf_offset - f->buf_size + f->buf_index;
653 int qemu_file_rate_limit(QEMUFile *f)
655 if (f->ops->rate_limit)
656 return f->ops->rate_limit(f->opaque);
661 int64_t qemu_file_get_rate_limit(QEMUFile *f)
663 if (f->ops->get_rate_limit)
664 return f->ops->get_rate_limit(f->opaque);
669 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
671 /* any failed or completed migration keeps its state to allow probing of
672 * migration data, but has no associated file anymore */
673 if (f && f->ops->set_rate_limit)
674 return f->ops->set_rate_limit(f->opaque, new_rate);
679 void qemu_put_be16(QEMUFile *f, unsigned int v)
681 qemu_put_byte(f, v >> 8);
685 void qemu_put_be32(QEMUFile *f, unsigned int v)
687 qemu_put_byte(f, v >> 24);
688 qemu_put_byte(f, v >> 16);
689 qemu_put_byte(f, v >> 8);
693 void qemu_put_be64(QEMUFile *f, uint64_t v)
695 qemu_put_be32(f, v >> 32);
699 unsigned int qemu_get_be16(QEMUFile *f)
702 v = qemu_get_byte(f) << 8;
703 v |= qemu_get_byte(f);
707 unsigned int qemu_get_be32(QEMUFile *f)
710 v = qemu_get_byte(f) << 24;
711 v |= qemu_get_byte(f) << 16;
712 v |= qemu_get_byte(f) << 8;
713 v |= qemu_get_byte(f);
717 uint64_t qemu_get_be64(QEMUFile *f)
720 v = (uint64_t)qemu_get_be32(f) << 32;
721 v |= qemu_get_be32(f);
728 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
730 uint64_t expire_time;
732 expire_time = qemu_timer_expire_time_ns(ts);
733 qemu_put_be64(f, expire_time);
736 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
738 uint64_t expire_time;
740 expire_time = qemu_get_be64(f);
741 if (expire_time != -1) {
742 qemu_mod_timer_ns(ts, expire_time);
751 static int get_bool(QEMUFile *f, void *pv, size_t size)
754 *v = qemu_get_byte(f);
758 static void put_bool(QEMUFile *f, void *pv, size_t size)
761 qemu_put_byte(f, *v);
764 const VMStateInfo vmstate_info_bool = {
772 static int get_int8(QEMUFile *f, void *pv, size_t size)
779 static void put_int8(QEMUFile *f, void *pv, size_t size)
785 const VMStateInfo vmstate_info_int8 = {
793 static int get_int16(QEMUFile *f, void *pv, size_t size)
796 qemu_get_sbe16s(f, v);
800 static void put_int16(QEMUFile *f, void *pv, size_t size)
803 qemu_put_sbe16s(f, v);
806 const VMStateInfo vmstate_info_int16 = {
814 static int get_int32(QEMUFile *f, void *pv, size_t size)
817 qemu_get_sbe32s(f, v);
821 static void put_int32(QEMUFile *f, void *pv, size_t size)
824 qemu_put_sbe32s(f, v);
827 const VMStateInfo vmstate_info_int32 = {
833 /* 32 bit int. See that the received value is the same than the one
836 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
840 qemu_get_sbe32s(f, &v2);
847 const VMStateInfo vmstate_info_int32_equal = {
848 .name = "int32 equal",
849 .get = get_int32_equal,
853 /* 32 bit int. See that the received value is the less or the same
854 than the one in the field */
856 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
860 qemu_get_sbe32s(f, &new);
867 const VMStateInfo vmstate_info_int32_le = {
868 .name = "int32 equal",
875 static int get_int64(QEMUFile *f, void *pv, size_t size)
878 qemu_get_sbe64s(f, v);
882 static void put_int64(QEMUFile *f, void *pv, size_t size)
885 qemu_put_sbe64s(f, v);
888 const VMStateInfo vmstate_info_int64 = {
894 /* 8 bit unsigned int */
896 static int get_uint8(QEMUFile *f, void *pv, size_t size)
903 static void put_uint8(QEMUFile *f, void *pv, size_t size)
909 const VMStateInfo vmstate_info_uint8 = {
915 /* 16 bit unsigned int */
917 static int get_uint16(QEMUFile *f, void *pv, size_t size)
920 qemu_get_be16s(f, v);
924 static void put_uint16(QEMUFile *f, void *pv, size_t size)
927 qemu_put_be16s(f, v);
930 const VMStateInfo vmstate_info_uint16 = {
936 /* 32 bit unsigned int */
938 static int get_uint32(QEMUFile *f, void *pv, size_t size)
941 qemu_get_be32s(f, v);
945 static void put_uint32(QEMUFile *f, void *pv, size_t size)
948 qemu_put_be32s(f, v);
951 const VMStateInfo vmstate_info_uint32 = {
957 /* 32 bit uint. See that the received value is the same than the one
960 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
964 qemu_get_be32s(f, &v2);
972 const VMStateInfo vmstate_info_uint32_equal = {
973 .name = "uint32 equal",
974 .get = get_uint32_equal,
978 /* 64 bit unsigned int */
980 static int get_uint64(QEMUFile *f, void *pv, size_t size)
983 qemu_get_be64s(f, v);
987 static void put_uint64(QEMUFile *f, void *pv, size_t size)
990 qemu_put_be64s(f, v);
993 const VMStateInfo vmstate_info_uint64 = {
999 /* 8 bit int. See that the received value is the same than the one
1002 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1006 qemu_get_8s(f, &v2);
1013 const VMStateInfo vmstate_info_uint8_equal = {
1014 .name = "uint8 equal",
1015 .get = get_uint8_equal,
1019 /* 16 bit unsigned int int. See that the received value is the same than the one
1022 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1026 qemu_get_be16s(f, &v2);
1033 const VMStateInfo vmstate_info_uint16_equal = {
1034 .name = "uint16 equal",
1035 .get = get_uint16_equal,
1041 static int get_timer(QEMUFile *f, void *pv, size_t size)
1044 qemu_get_timer(f, v);
1048 static void put_timer(QEMUFile *f, void *pv, size_t size)
1051 qemu_put_timer(f, v);
1054 const VMStateInfo vmstate_info_timer = {
1060 /* uint8_t buffers */
1062 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1065 qemu_get_buffer(f, v, size);
1069 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1072 qemu_put_buffer(f, v, size);
1075 const VMStateInfo vmstate_info_buffer = {
1081 /* unused buffers: space that was used for some fields that are
1082 not useful anymore */
1084 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1090 block_len = MIN(sizeof(buf), size);
1092 qemu_get_buffer(f, buf, block_len);
1097 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1099 static const uint8_t buf[1024];
1103 block_len = MIN(sizeof(buf), size);
1105 qemu_put_buffer(f, buf, block_len);
1109 const VMStateInfo vmstate_info_unused_buffer = {
1110 .name = "unused_buffer",
1111 .get = get_unused_buffer,
1112 .put = put_unused_buffer,
1115 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1116 * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1117 * bit words with the bits in big endian order. The in-memory format
1118 * is an array of 'unsigned long', which may be either 32 or 64 bits.
1120 /* This is the number of 64 bit words sent over the wire */
1121 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1122 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1124 unsigned long *bmp = pv;
1126 for (i = 0; i < BITS_TO_U64S(size); i++) {
1127 uint64_t w = qemu_get_be64(f);
1129 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1130 bmp[idx++] = w >> 32;
1136 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1138 unsigned long *bmp = pv;
1140 for (i = 0; i < BITS_TO_U64S(size); i++) {
1141 uint64_t w = bmp[idx++];
1142 if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1143 w |= ((uint64_t)bmp[idx++]) << 32;
1145 qemu_put_be64(f, w);
1149 const VMStateInfo vmstate_info_bitmap = {
1155 typedef struct CompatEntry {
1160 typedef struct SaveStateEntry {
1161 QTAILQ_ENTRY(SaveStateEntry) entry;
1167 SaveVMHandlers *ops;
1168 const VMStateDescription *vmsd;
1170 CompatEntry *compat;
1176 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1177 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1178 static int global_section_id;
1180 static int calculate_new_instance_id(const char *idstr)
1183 int instance_id = 0;
1185 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1186 if (strcmp(idstr, se->idstr) == 0
1187 && instance_id <= se->instance_id) {
1188 instance_id = se->instance_id + 1;
1194 static int calculate_compat_instance_id(const char *idstr)
1197 int instance_id = 0;
1199 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1203 if (strcmp(idstr, se->compat->idstr) == 0
1204 && instance_id <= se->compat->instance_id) {
1205 instance_id = se->compat->instance_id + 1;
1211 /* TODO: Individual devices generally have very little idea about the rest
1212 of the system, so instance_id should be removed/replaced.
1213 Meanwhile pass -1 as instance_id if you do not already have a clearly
1214 distinguishing id for all instances of your device class. */
1215 int register_savevm_live(DeviceState *dev,
1219 SaveVMHandlers *ops,
1224 se = g_malloc0(sizeof(SaveStateEntry));
1225 se->version_id = version_id;
1226 se->section_id = global_section_id++;
1228 se->opaque = opaque;
1231 /* if this is a live_savem then set is_ram */
1232 if (ops->save_live_setup != NULL) {
1237 char *id = qdev_get_dev_path(dev);
1239 pstrcpy(se->idstr, sizeof(se->idstr), id);
1240 pstrcat(se->idstr, sizeof(se->idstr), "/");
1243 se->compat = g_malloc0(sizeof(CompatEntry));
1244 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1245 se->compat->instance_id = instance_id == -1 ?
1246 calculate_compat_instance_id(idstr) : instance_id;
1250 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1252 if (instance_id == -1) {
1253 se->instance_id = calculate_new_instance_id(se->idstr);
1255 se->instance_id = instance_id;
1257 assert(!se->compat || se->instance_id == 0);
1258 /* add at the end of list */
1259 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1263 int register_savevm(DeviceState *dev,
1267 SaveStateHandler *save_state,
1268 LoadStateHandler *load_state,
1271 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1272 ops->save_state = save_state;
1273 ops->load_state = load_state;
1274 return register_savevm_live(dev, idstr, instance_id, version_id,
1278 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1280 SaveStateEntry *se, *new_se;
1284 char *path = qdev_get_dev_path(dev);
1286 pstrcpy(id, sizeof(id), path);
1287 pstrcat(id, sizeof(id), "/");
1291 pstrcat(id, sizeof(id), idstr);
1293 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1294 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1295 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1305 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1306 const VMStateDescription *vmsd,
1307 void *opaque, int alias_id,
1308 int required_for_version)
1312 /* If this triggers, alias support can be dropped for the vmsd. */
1313 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1315 se = g_malloc0(sizeof(SaveStateEntry));
1316 se->version_id = vmsd->version_id;
1317 se->section_id = global_section_id++;
1318 se->opaque = opaque;
1320 se->alias_id = alias_id;
1321 se->no_migrate = vmsd->unmigratable;
1324 char *id = qdev_get_dev_path(dev);
1326 pstrcpy(se->idstr, sizeof(se->idstr), id);
1327 pstrcat(se->idstr, sizeof(se->idstr), "/");
1330 se->compat = g_malloc0(sizeof(CompatEntry));
1331 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1332 se->compat->instance_id = instance_id == -1 ?
1333 calculate_compat_instance_id(vmsd->name) : instance_id;
1337 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1339 if (instance_id == -1) {
1340 se->instance_id = calculate_new_instance_id(se->idstr);
1342 se->instance_id = instance_id;
1344 assert(!se->compat || se->instance_id == 0);
1345 /* add at the end of list */
1346 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1350 int vmstate_register(DeviceState *dev, int instance_id,
1351 const VMStateDescription *vmsd, void *opaque)
1353 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1357 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1360 SaveStateEntry *se, *new_se;
1362 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1363 if (se->vmsd == vmsd && se->opaque == opaque) {
1364 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1373 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1375 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1378 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1379 void *opaque, int version_id)
1381 VMStateField *field = vmsd->fields;
1384 if (version_id > vmsd->version_id) {
1387 if (version_id < vmsd->minimum_version_id_old) {
1390 if (version_id < vmsd->minimum_version_id) {
1391 return vmsd->load_state_old(f, opaque, version_id);
1393 if (vmsd->pre_load) {
1394 int ret = vmsd->pre_load(opaque);
1398 while(field->name) {
1399 if ((field->field_exists &&
1400 field->field_exists(opaque, version_id)) ||
1401 (!field->field_exists &&
1402 field->version_id <= version_id)) {
1403 void *base_addr = opaque + field->offset;
1405 int size = field->size;
1407 if (field->flags & VMS_VBUFFER) {
1408 size = *(int32_t *)(opaque+field->size_offset);
1409 if (field->flags & VMS_MULTIPLY) {
1410 size *= field->size;
1413 if (field->flags & VMS_ARRAY) {
1414 n_elems = field->num;
1415 } else if (field->flags & VMS_VARRAY_INT32) {
1416 n_elems = *(int32_t *)(opaque+field->num_offset);
1417 } else if (field->flags & VMS_VARRAY_UINT32) {
1418 n_elems = *(uint32_t *)(opaque+field->num_offset);
1419 } else if (field->flags & VMS_VARRAY_UINT16) {
1420 n_elems = *(uint16_t *)(opaque+field->num_offset);
1421 } else if (field->flags & VMS_VARRAY_UINT8) {
1422 n_elems = *(uint8_t *)(opaque+field->num_offset);
1424 if (field->flags & VMS_POINTER) {
1425 base_addr = *(void **)base_addr + field->start;
1427 for (i = 0; i < n_elems; i++) {
1428 void *addr = base_addr + size * i;
1430 if (field->flags & VMS_ARRAY_OF_POINTER) {
1431 addr = *(void **)addr;
1433 if (field->flags & VMS_STRUCT) {
1434 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1436 ret = field->info->get(f, addr, size);
1446 ret = vmstate_subsection_load(f, vmsd, opaque);
1450 if (vmsd->post_load) {
1451 return vmsd->post_load(opaque, version_id);
1456 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1459 VMStateField *field = vmsd->fields;
1461 if (vmsd->pre_save) {
1462 vmsd->pre_save(opaque);
1464 while(field->name) {
1465 if (!field->field_exists ||
1466 field->field_exists(opaque, vmsd->version_id)) {
1467 void *base_addr = opaque + field->offset;
1469 int size = field->size;
1471 if (field->flags & VMS_VBUFFER) {
1472 size = *(int32_t *)(opaque+field->size_offset);
1473 if (field->flags & VMS_MULTIPLY) {
1474 size *= field->size;
1477 if (field->flags & VMS_ARRAY) {
1478 n_elems = field->num;
1479 } else if (field->flags & VMS_VARRAY_INT32) {
1480 n_elems = *(int32_t *)(opaque+field->num_offset);
1481 } else if (field->flags & VMS_VARRAY_UINT32) {
1482 n_elems = *(uint32_t *)(opaque+field->num_offset);
1483 } else if (field->flags & VMS_VARRAY_UINT16) {
1484 n_elems = *(uint16_t *)(opaque+field->num_offset);
1485 } else if (field->flags & VMS_VARRAY_UINT8) {
1486 n_elems = *(uint8_t *)(opaque+field->num_offset);
1488 if (field->flags & VMS_POINTER) {
1489 base_addr = *(void **)base_addr + field->start;
1491 for (i = 0; i < n_elems; i++) {
1492 void *addr = base_addr + size * i;
1494 if (field->flags & VMS_ARRAY_OF_POINTER) {
1495 addr = *(void **)addr;
1497 if (field->flags & VMS_STRUCT) {
1498 vmstate_save_state(f, field->vmsd, addr);
1500 field->info->put(f, addr, size);
1506 vmstate_subsection_save(f, vmsd, opaque);
1509 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1511 if (!se->vmsd) { /* Old style */
1512 return se->ops->load_state(f, se->opaque, version_id);
1514 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1517 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1519 if (!se->vmsd) { /* Old style */
1520 se->ops->save_state(f, se->opaque);
1523 vmstate_save_state(f,se->vmsd, se->opaque);
1526 #define QEMU_VM_FILE_MAGIC 0x5145564d
1527 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1528 #define QEMU_VM_FILE_VERSION 0x00000003
1530 #define QEMU_VM_EOF 0x00
1531 #define QEMU_VM_SECTION_START 0x01
1532 #define QEMU_VM_SECTION_PART 0x02
1533 #define QEMU_VM_SECTION_END 0x03
1534 #define QEMU_VM_SECTION_FULL 0x04
1535 #define QEMU_VM_SUBSECTION 0x05
1537 bool qemu_savevm_state_blocked(Error **errp)
1541 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1542 if (se->no_migrate) {
1543 error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1550 int qemu_savevm_state_begin(QEMUFile *f,
1551 const MigrationParams *params)
1556 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1557 if (!se->ops || !se->ops->set_params) {
1560 se->ops->set_params(params, se->opaque);
1563 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1564 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1566 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1569 if (!se->ops || !se->ops->save_live_setup) {
1572 if (se->ops && se->ops->is_active) {
1573 if (!se->ops->is_active(se->opaque)) {
1578 qemu_put_byte(f, QEMU_VM_SECTION_START);
1579 qemu_put_be32(f, se->section_id);
1582 len = strlen(se->idstr);
1583 qemu_put_byte(f, len);
1584 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1586 qemu_put_be32(f, se->instance_id);
1587 qemu_put_be32(f, se->version_id);
1589 ret = se->ops->save_live_setup(f, se->opaque);
1591 qemu_savevm_state_cancel(f);
1595 ret = qemu_file_get_error(f);
1597 qemu_savevm_state_cancel(f);
1605 * this function has three return values:
1606 * negative: there was one error, and we have -errno.
1607 * 0 : We haven't finished, caller have to go again
1608 * 1 : We have finished, we can go to complete phase
1610 int qemu_savevm_state_iterate(QEMUFile *f)
1615 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1616 if (!se->ops || !se->ops->save_live_iterate) {
1619 if (se->ops && se->ops->is_active) {
1620 if (!se->ops->is_active(se->opaque)) {
1624 if (qemu_file_rate_limit(f)) {
1627 trace_savevm_section_start();
1629 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1630 qemu_put_be32(f, se->section_id);
1632 ret = se->ops->save_live_iterate(f, se->opaque);
1633 trace_savevm_section_end(se->section_id);
1636 /* Do not proceed to the next vmstate before this one reported
1637 completion of the current stage. This serializes the migration
1638 and reduces the probability that a faster changing state is
1639 synchronized over and over again. */
1646 ret = qemu_file_get_error(f);
1648 qemu_savevm_state_cancel(f);
1653 int qemu_savevm_state_complete(QEMUFile *f)
1658 cpu_synchronize_all_states();
1660 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1661 if (!se->ops || !se->ops->save_live_complete) {
1664 if (se->ops && se->ops->is_active) {
1665 if (!se->ops->is_active(se->opaque)) {
1669 trace_savevm_section_start();
1671 qemu_put_byte(f, QEMU_VM_SECTION_END);
1672 qemu_put_be32(f, se->section_id);
1674 ret = se->ops->save_live_complete(f, se->opaque);
1675 trace_savevm_section_end(se->section_id);
1681 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1684 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1687 trace_savevm_section_start();
1689 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1690 qemu_put_be32(f, se->section_id);
1693 len = strlen(se->idstr);
1694 qemu_put_byte(f, len);
1695 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1697 qemu_put_be32(f, se->instance_id);
1698 qemu_put_be32(f, se->version_id);
1700 vmstate_save(f, se);
1701 trace_savevm_section_end(se->section_id);
1704 qemu_put_byte(f, QEMU_VM_EOF);
1706 return qemu_file_get_error(f);
1709 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
1714 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1715 if (!se->ops || !se->ops->save_live_pending) {
1718 if (se->ops && se->ops->is_active) {
1719 if (!se->ops->is_active(se->opaque)) {
1723 ret += se->ops->save_live_pending(f, se->opaque, max_size);
1728 void qemu_savevm_state_cancel(QEMUFile *f)
1732 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1733 if (se->ops && se->ops->cancel) {
1734 se->ops->cancel(se->opaque);
1739 static int qemu_savevm_state(QEMUFile *f)
1742 MigrationParams params = {
1747 if (qemu_savevm_state_blocked(NULL)) {
1752 ret = qemu_savevm_state_begin(f, ¶ms);
1757 ret = qemu_savevm_state_iterate(f);
1762 ret = qemu_savevm_state_complete(f);
1766 ret = qemu_file_get_error(f);
1772 static int qemu_save_device_state(QEMUFile *f)
1776 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1777 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1779 cpu_synchronize_all_states();
1781 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1787 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1792 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1793 qemu_put_be32(f, se->section_id);
1796 len = strlen(se->idstr);
1797 qemu_put_byte(f, len);
1798 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1800 qemu_put_be32(f, se->instance_id);
1801 qemu_put_be32(f, se->version_id);
1803 vmstate_save(f, se);
1806 qemu_put_byte(f, QEMU_VM_EOF);
1808 return qemu_file_get_error(f);
1811 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1815 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1816 if (!strcmp(se->idstr, idstr) &&
1817 (instance_id == se->instance_id ||
1818 instance_id == se->alias_id))
1820 /* Migrating from an older version? */
1821 if (strstr(se->idstr, idstr) && se->compat) {
1822 if (!strcmp(se->compat->idstr, idstr) &&
1823 (instance_id == se->compat->instance_id ||
1824 instance_id == se->alias_id))
1831 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1833 while(sub && sub->needed) {
1834 if (strcmp(idstr, sub->vmsd->name) == 0) {
1842 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1845 while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1848 uint8_t version_id, len, size;
1849 const VMStateDescription *sub_vmsd;
1851 len = qemu_peek_byte(f, 1);
1852 if (len < strlen(vmsd->name) + 1) {
1853 /* subsection name has be be "section_name/a" */
1856 size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1862 if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1863 /* it don't have a valid subsection name */
1866 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1867 if (sub_vmsd == NULL) {
1870 qemu_file_skip(f, 1); /* subsection */
1871 qemu_file_skip(f, 1); /* len */
1872 qemu_file_skip(f, len); /* idstr */
1873 version_id = qemu_get_be32(f);
1875 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1883 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1886 const VMStateSubsection *sub = vmsd->subsections;
1888 while (sub && sub->needed) {
1889 if (sub->needed(opaque)) {
1890 const VMStateDescription *vmsd = sub->vmsd;
1893 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1894 len = strlen(vmsd->name);
1895 qemu_put_byte(f, len);
1896 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1897 qemu_put_be32(f, vmsd->version_id);
1898 vmstate_save_state(f, vmsd, opaque);
1904 typedef struct LoadStateEntry {
1905 QLIST_ENTRY(LoadStateEntry) entry;
1911 int qemu_loadvm_state(QEMUFile *f)
1913 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1914 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1915 LoadStateEntry *le, *new_le;
1916 uint8_t section_type;
1920 if (qemu_savevm_state_blocked(NULL)) {
1924 v = qemu_get_be32(f);
1925 if (v != QEMU_VM_FILE_MAGIC)
1928 v = qemu_get_be32(f);
1929 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1930 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1933 if (v != QEMU_VM_FILE_VERSION)
1936 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1937 uint32_t instance_id, version_id, section_id;
1942 switch (section_type) {
1943 case QEMU_VM_SECTION_START:
1944 case QEMU_VM_SECTION_FULL:
1945 /* Read section start */
1946 section_id = qemu_get_be32(f);
1947 len = qemu_get_byte(f);
1948 qemu_get_buffer(f, (uint8_t *)idstr, len);
1950 instance_id = qemu_get_be32(f);
1951 version_id = qemu_get_be32(f);
1953 /* Find savevm section */
1954 se = find_se(idstr, instance_id);
1956 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1961 /* Validate version */
1962 if (version_id > se->version_id) {
1963 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1964 version_id, idstr, se->version_id);
1970 le = g_malloc0(sizeof(*le));
1973 le->section_id = section_id;
1974 le->version_id = version_id;
1975 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1977 ret = vmstate_load(f, le->se, le->version_id);
1979 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1980 instance_id, idstr);
1984 case QEMU_VM_SECTION_PART:
1985 case QEMU_VM_SECTION_END:
1986 section_id = qemu_get_be32(f);
1988 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1989 if (le->section_id == section_id) {
1994 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1999 ret = vmstate_load(f, le->se, le->version_id);
2001 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2007 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2013 cpu_synchronize_all_post_init();
2018 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2019 QLIST_REMOVE(le, entry);
2024 ret = qemu_file_get_error(f);
2030 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
2033 QEMUSnapshotInfo *sn_tab, *sn;
2037 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2040 for(i = 0; i < nb_sns; i++) {
2042 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2053 * Deletes snapshots of a given name in all opened images.
2055 static int del_existing_snapshots(Monitor *mon, const char *name)
2057 BlockDriverState *bs;
2058 QEMUSnapshotInfo sn1, *snapshot = &sn1;
2062 while ((bs = bdrv_next(bs))) {
2063 if (bdrv_can_snapshot(bs) &&
2064 bdrv_snapshot_find(bs, snapshot, name) >= 0)
2066 ret = bdrv_snapshot_delete(bs, name);
2069 "Error while deleting snapshot on '%s'\n",
2070 bdrv_get_device_name(bs));
2079 void do_savevm(Monitor *mon, const QDict *qdict)
2081 BlockDriverState *bs, *bs1;
2082 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2085 int saved_vm_running;
2086 uint64_t vm_state_size;
2089 const char *name = qdict_get_try_str(qdict, "name");
2091 /* Verify if there is a device that doesn't support snapshots and is writable */
2093 while ((bs = bdrv_next(bs))) {
2095 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2099 if (!bdrv_can_snapshot(bs)) {
2100 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2101 bdrv_get_device_name(bs));
2106 bs = bdrv_snapshots();
2108 monitor_printf(mon, "No block device can accept snapshots\n");
2112 saved_vm_running = runstate_is_running();
2113 vm_stop(RUN_STATE_SAVE_VM);
2115 memset(sn, 0, sizeof(*sn));
2117 /* fill auxiliary fields */
2118 qemu_gettimeofday(&tv);
2119 sn->date_sec = tv.tv_sec;
2120 sn->date_nsec = tv.tv_usec * 1000;
2121 sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2124 ret = bdrv_snapshot_find(bs, old_sn, name);
2126 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2127 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2129 pstrcpy(sn->name, sizeof(sn->name), name);
2132 /* cast below needed for OpenBSD where tv_sec is still 'long' */
2133 localtime_r((const time_t *)&tv.tv_sec, &tm);
2134 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2137 /* Delete old snapshots of the same name */
2138 if (name && del_existing_snapshots(mon, name) < 0) {
2142 /* save the VM state */
2143 f = qemu_fopen_bdrv(bs, 1);
2145 monitor_printf(mon, "Could not open VM state file\n");
2148 ret = qemu_savevm_state(f);
2149 vm_state_size = qemu_ftell(f);
2152 monitor_printf(mon, "Error %d while writing VM\n", ret);
2156 /* create the snapshots */
2159 while ((bs1 = bdrv_next(bs1))) {
2160 if (bdrv_can_snapshot(bs1)) {
2161 /* Write VM state size only to the image that contains the state */
2162 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2163 ret = bdrv_snapshot_create(bs1, sn);
2165 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2166 bdrv_get_device_name(bs1));
2172 if (saved_vm_running)
2176 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2179 int saved_vm_running;
2182 saved_vm_running = runstate_is_running();
2183 vm_stop(RUN_STATE_SAVE_VM);
2185 f = qemu_fopen(filename, "wb");
2187 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2190 ret = qemu_save_device_state(f);
2193 error_set(errp, QERR_IO_ERROR);
2197 if (saved_vm_running)
2201 int load_vmstate(const char *name)
2203 BlockDriverState *bs, *bs_vm_state;
2204 QEMUSnapshotInfo sn;
2208 bs_vm_state = bdrv_snapshots();
2210 error_report("No block device supports snapshots");
2214 /* Don't even try to load empty VM states */
2215 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2218 } else if (sn.vm_state_size == 0) {
2219 error_report("This is a disk-only snapshot. Revert to it offline "
2224 /* Verify if there is any device that doesn't support snapshots and is
2225 writable and check if the requested snapshot is available too. */
2227 while ((bs = bdrv_next(bs))) {
2229 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2233 if (!bdrv_can_snapshot(bs)) {
2234 error_report("Device '%s' is writable but does not support snapshots.",
2235 bdrv_get_device_name(bs));
2239 ret = bdrv_snapshot_find(bs, &sn, name);
2241 error_report("Device '%s' does not have the requested snapshot '%s'",
2242 bdrv_get_device_name(bs), name);
2247 /* Flush all IO requests so they don't interfere with the new state. */
2251 while ((bs = bdrv_next(bs))) {
2252 if (bdrv_can_snapshot(bs)) {
2253 ret = bdrv_snapshot_goto(bs, name);
2255 error_report("Error %d while activating snapshot '%s' on '%s'",
2256 ret, name, bdrv_get_device_name(bs));
2262 /* restore the VM state */
2263 f = qemu_fopen_bdrv(bs_vm_state, 0);
2265 error_report("Could not open VM state file");
2269 qemu_system_reset(VMRESET_SILENT);
2270 ret = qemu_loadvm_state(f);
2274 error_report("Error %d while loading VM state", ret);
2281 void do_delvm(Monitor *mon, const QDict *qdict)
2283 BlockDriverState *bs, *bs1;
2285 const char *name = qdict_get_str(qdict, "name");
2287 bs = bdrv_snapshots();
2289 monitor_printf(mon, "No block device supports snapshots\n");
2294 while ((bs1 = bdrv_next(bs1))) {
2295 if (bdrv_can_snapshot(bs1)) {
2296 ret = bdrv_snapshot_delete(bs1, name);
2298 if (ret == -ENOTSUP)
2300 "Snapshots not supported on device '%s'\n",
2301 bdrv_get_device_name(bs1));
2303 monitor_printf(mon, "Error %d while deleting snapshot on "
2304 "'%s'\n", ret, bdrv_get_device_name(bs1));
2310 void do_info_snapshots(Monitor *mon)
2312 BlockDriverState *bs, *bs1;
2313 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2314 int nb_sns, i, ret, available;
2316 int *available_snapshots;
2319 bs = bdrv_snapshots();
2321 monitor_printf(mon, "No available block device supports snapshots\n");
2325 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2327 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2332 monitor_printf(mon, "There is no snapshot available.\n");
2336 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2338 for (i = 0; i < nb_sns; i++) {
2343 while ((bs1 = bdrv_next(bs1))) {
2344 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2345 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2354 available_snapshots[total] = i;
2360 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2361 for (i = 0; i < total; i++) {
2362 sn = &sn_tab[available_snapshots[i]];
2363 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2366 monitor_printf(mon, "There is no suitable snapshot available\n");
2370 g_free(available_snapshots);
2374 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2376 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2377 memory_region_name(mr), dev);
2380 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2382 /* Nothing do to while the implementation is in RAMBlock */
2385 void vmstate_register_ram_global(MemoryRegion *mr)
2387 vmstate_register_ram(mr, NULL);
2396 nzrun = length byte...
2398 length = uleb128 encoded integer
2400 int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
2401 uint8_t *dst, int dlen)
2403 uint32_t zrun_len = 0, nzrun_len = 0;
2406 uint8_t *nzrun_start = NULL;
2408 g_assert(!(((uintptr_t)old_buf | (uintptr_t)new_buf | slen) %
2417 /* not aligned to sizeof(long) */
2418 res = (slen - i) % sizeof(long);
2419 while (res && old_buf[i] == new_buf[i]) {
2425 /* word at a time for speed */
2428 (*(long *)(old_buf + i)) == (*(long *)(new_buf + i))) {
2430 zrun_len += sizeof(long);
2433 /* go over the rest */
2434 while (i < slen && old_buf[i] == new_buf[i]) {
2440 /* buffer unchanged */
2441 if (zrun_len == slen) {
2445 /* skip last zero run */
2450 d += uleb128_encode_small(dst + d, zrun_len);
2453 nzrun_start = new_buf + i;
2459 /* not aligned to sizeof(long) */
2460 res = (slen - i) % sizeof(long);
2461 while (res && old_buf[i] != new_buf[i]) {
2467 /* word at a time for speed, use of 32-bit long okay */
2469 /* truncation to 32-bit long okay */
2470 long mask = (long)0x0101010101010101ULL;
2472 xor = *(long *)(old_buf + i) ^ *(long *)(new_buf + i);
2473 if ((xor - mask) & ~xor & (mask << 7)) {
2474 /* found the end of an nzrun within the current long */
2475 while (old_buf[i] != new_buf[i]) {
2482 nzrun_len += sizeof(long);
2487 d += uleb128_encode_small(dst + d, nzrun_len);
2489 if (d + nzrun_len > dlen) {
2492 memcpy(dst + d, nzrun_start, nzrun_len);
2500 int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen)
2509 if ((slen - i) < 2) {
2513 ret = uleb128_decode_small(src + i, &count);
2514 if (ret < 0 || (i && !count)) {
2526 if ((slen - i) < 2) {
2530 ret = uleb128_decode_small(src + i, &count);
2531 if (ret < 0 || !count) {
2537 if (d + count > dlen || i + count > slen) {
2541 memcpy(dst + d, src + i, count);