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
32 /* Needed early for CONFIG_BSD etc. */
33 #include "config-host.h"
36 #include <sys/times.h>
40 #include <sys/ioctl.h>
41 #include <sys/resource.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
45 #if defined(__NetBSD__)
46 #include <net/if_tap.h>
49 #include <linux/if_tun.h>
51 #include <arpa/inet.h>
54 #include <sys/select.h>
57 #if defined(__FreeBSD__) || defined(__DragonFly__)
62 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
63 #include <freebsd/stdlib.h>
68 #include <linux/rtc.h>
76 #include <sys/timeb.h>
78 #define getopt_long_only getopt_long
79 #define memalign(align, size) malloc(size)
82 #include "qemu-common.h"
87 #include "qemu-timer.h"
88 #include "qemu-char.h"
90 #include "audio/audio.h"
91 #include "migration.h"
92 #include "qemu_socket.h"
93 #include "qemu-queue.h"
95 /* point to the block driver where the snapshots are managed */
96 static BlockDriverState *bs_snapshots;
98 #define SELF_ANNOUNCE_ROUNDS 5
99 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
100 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
101 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
103 static int announce_self_create(uint8_t *buf,
106 uint32_t magic = EXPERIMENTAL_MAGIC;
107 uint16_t proto = htons(ETH_P_EXPERIMENTAL);
109 /* FIXME: should we send a different packet (arp/rarp/ping)? */
112 memset(buf, 0xff, 6); /* h_dst */
113 memcpy(buf + 6, mac_addr, 6); /* h_src */
114 memcpy(buf + 12, &proto, 2); /* h_proto */
115 memcpy(buf + 14, &magic, 4); /* magic */
120 static void qemu_announce_self_once(void *opaque)
126 static int count = SELF_ANNOUNCE_ROUNDS;
127 QEMUTimer *timer = *(QEMUTimer **)opaque;
129 for (i = 0; i < MAX_NICS; i++) {
130 if (!nd_table[i].used)
132 len = announce_self_create(buf, nd_table[i].macaddr);
133 vlan = nd_table[i].vlan;
134 for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
135 vc->receive(vc, buf, len);
139 qemu_mod_timer(timer, qemu_get_clock(rt_clock) + 100);
141 qemu_del_timer(timer);
142 qemu_free_timer(timer);
146 void qemu_announce_self(void)
148 static QEMUTimer *timer;
149 timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
150 qemu_announce_self_once(&timer);
153 /***********************************************************/
154 /* savevm/loadvm support */
156 #define IO_BUF_SIZE 32768
159 QEMUFilePutBufferFunc *put_buffer;
160 QEMUFileGetBufferFunc *get_buffer;
161 QEMUFileCloseFunc *close;
162 QEMUFileRateLimit *rate_limit;
163 QEMUFileSetRateLimit *set_rate_limit;
167 int64_t buf_offset; /* start of buffer when writing, end of buffer
170 int buf_size; /* 0 when writing */
171 uint8_t buf[IO_BUF_SIZE];
176 typedef struct QEMUFileStdio
182 typedef struct QEMUFileSocket
188 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
190 QEMUFileSocket *s = opaque;
194 len = recv(s->fd, (void *)buf, size, 0);
195 } while (len == -1 && socket_error() == EINTR);
198 len = -socket_error();
203 static int socket_close(void *opaque)
205 QEMUFileSocket *s = opaque;
210 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
212 QEMUFileStdio *s = opaque;
213 return fwrite(buf, 1, size, s->stdio_file);
216 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
218 QEMUFileStdio *s = opaque;
219 FILE *fp = s->stdio_file;
224 bytes = fread(buf, 1, size, fp);
225 } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
229 static int stdio_pclose(void *opaque)
231 QEMUFileStdio *s = opaque;
232 pclose(s->stdio_file);
237 static int stdio_fclose(void *opaque)
239 QEMUFileStdio *s = opaque;
240 fclose(s->stdio_file);
245 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
249 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
250 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
254 s = qemu_mallocz(sizeof(QEMUFileStdio));
256 s->stdio_file = stdio_file;
259 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
261 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, NULL, NULL);
266 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
270 popen_file = popen(command, mode);
271 if(popen_file == NULL) {
275 return qemu_popen(popen_file, mode);
278 int qemu_stdio_fd(QEMUFile *f)
283 p = (QEMUFileStdio *)f->opaque;
284 fd = fileno(p->stdio_file);
289 QEMUFile *qemu_fdopen(int fd, const char *mode)
294 (mode[0] != 'r' && mode[0] != 'w') ||
295 mode[1] != 'b' || mode[2] != 0) {
296 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
300 s = qemu_mallocz(sizeof(QEMUFileStdio));
301 s->stdio_file = fdopen(fd, mode);
306 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, NULL, NULL);
308 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, NULL, NULL);
317 QEMUFile *qemu_fopen_socket(int fd)
319 QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
322 s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL, NULL);
326 static int file_put_buffer(void *opaque, const uint8_t *buf,
327 int64_t pos, int size)
329 QEMUFileStdio *s = opaque;
330 fseek(s->stdio_file, pos, SEEK_SET);
331 fwrite(buf, 1, size, s->stdio_file);
335 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
337 QEMUFileStdio *s = opaque;
338 fseek(s->stdio_file, pos, SEEK_SET);
339 return fread(buf, 1, size, s->stdio_file);
342 QEMUFile *qemu_fopen(const char *filename, const char *mode)
347 (mode[0] != 'r' && mode[0] != 'w') ||
348 mode[1] != 'b' || mode[2] != 0) {
349 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
353 s = qemu_mallocz(sizeof(QEMUFileStdio));
355 s->stdio_file = fopen(filename, mode);
360 s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, NULL, NULL);
362 s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
370 static int block_put_buffer(void *opaque, const uint8_t *buf,
371 int64_t pos, int size)
373 bdrv_save_vmstate(opaque, buf, pos, size);
377 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
379 return bdrv_load_vmstate(opaque, buf, pos, size);
382 static int bdrv_fclose(void *opaque)
387 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
390 return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
391 return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
394 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
395 QEMUFileGetBufferFunc *get_buffer,
396 QEMUFileCloseFunc *close,
397 QEMUFileRateLimit *rate_limit,
398 QEMUFileSetRateLimit *set_rate_limit)
402 f = qemu_mallocz(sizeof(QEMUFile));
405 f->put_buffer = put_buffer;
406 f->get_buffer = get_buffer;
408 f->rate_limit = rate_limit;
409 f->set_rate_limit = set_rate_limit;
415 int qemu_file_has_error(QEMUFile *f)
420 void qemu_file_set_error(QEMUFile *f)
425 void qemu_fflush(QEMUFile *f)
430 if (f->is_write && f->buf_index > 0) {
433 len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
435 f->buf_offset += f->buf_index;
442 static void qemu_fill_buffer(QEMUFile *f)
452 len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
456 f->buf_offset += len;
457 } else if (len != -EAGAIN)
461 int qemu_fclose(QEMUFile *f)
466 ret = f->close(f->opaque);
471 void qemu_file_put_notify(QEMUFile *f)
473 f->put_buffer(f->opaque, NULL, 0, 0);
476 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
480 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
482 "Attempted to write to buffer while read buffer is not empty\n");
486 while (!f->has_error && size > 0) {
487 l = IO_BUF_SIZE - f->buf_index;
490 memcpy(f->buf + f->buf_index, buf, l);
495 if (f->buf_index >= IO_BUF_SIZE)
500 void qemu_put_byte(QEMUFile *f, int v)
502 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
504 "Attempted to write to buffer while read buffer is not empty\n");
508 f->buf[f->buf_index++] = v;
510 if (f->buf_index >= IO_BUF_SIZE)
514 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
523 l = f->buf_size - f->buf_index;
526 l = f->buf_size - f->buf_index;
532 memcpy(buf, f->buf + f->buf_index, l);
540 int qemu_get_byte(QEMUFile *f)
545 if (f->buf_index >= f->buf_size) {
547 if (f->buf_index >= f->buf_size)
550 return f->buf[f->buf_index++];
553 int64_t qemu_ftell(QEMUFile *f)
555 return f->buf_offset - f->buf_size + f->buf_index;
558 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
560 if (whence == SEEK_SET) {
562 } else if (whence == SEEK_CUR) {
563 pos += qemu_ftell(f);
565 /* SEEK_END not supported */
579 int qemu_file_rate_limit(QEMUFile *f)
582 return f->rate_limit(f->opaque);
587 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
589 /* any failed or completed migration keeps its state to allow probing of
590 * migration data, but has no associated file anymore */
591 if (f && f->set_rate_limit)
592 return f->set_rate_limit(f->opaque, new_rate);
597 void qemu_put_be16(QEMUFile *f, unsigned int v)
599 qemu_put_byte(f, v >> 8);
603 void qemu_put_be32(QEMUFile *f, unsigned int v)
605 qemu_put_byte(f, v >> 24);
606 qemu_put_byte(f, v >> 16);
607 qemu_put_byte(f, v >> 8);
611 void qemu_put_be64(QEMUFile *f, uint64_t v)
613 qemu_put_be32(f, v >> 32);
617 unsigned int qemu_get_be16(QEMUFile *f)
620 v = qemu_get_byte(f) << 8;
621 v |= qemu_get_byte(f);
625 unsigned int qemu_get_be32(QEMUFile *f)
628 v = qemu_get_byte(f) << 24;
629 v |= qemu_get_byte(f) << 16;
630 v |= qemu_get_byte(f) << 8;
631 v |= qemu_get_byte(f);
635 uint64_t qemu_get_be64(QEMUFile *f)
638 v = (uint64_t)qemu_get_be32(f) << 32;
639 v |= qemu_get_be32(f);
645 static int get_int8(QEMUFile *f, void *pv, size_t size)
652 static void put_int8(QEMUFile *f, const void *pv, size_t size)
654 const int8_t *v = pv;
658 const VMStateInfo vmstate_info_int8 = {
666 static int get_int16(QEMUFile *f, void *pv, size_t size)
669 qemu_get_sbe16s(f, v);
673 static void put_int16(QEMUFile *f, const void *pv, size_t size)
675 const int16_t *v = pv;
676 qemu_put_sbe16s(f, v);
679 const VMStateInfo vmstate_info_int16 = {
687 static int get_int32(QEMUFile *f, void *pv, size_t size)
690 qemu_get_sbe32s(f, v);
694 static void put_int32(QEMUFile *f, const void *pv, size_t size)
696 const int32_t *v = pv;
697 qemu_put_sbe32s(f, v);
700 const VMStateInfo vmstate_info_int32 = {
706 /* 32 bit int. See that the received value is the same than the one
709 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
713 qemu_get_sbe32s(f, &v2);
720 const VMStateInfo vmstate_info_int32_equal = {
721 .name = "int32 equal",
722 .get = get_int32_equal,
726 /* 32 bit int. See that the received value is the less or the same
727 than the one in the field */
729 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
733 qemu_get_sbe32s(f, &new);
740 const VMStateInfo vmstate_info_int32_le = {
741 .name = "int32 equal",
748 static int get_int64(QEMUFile *f, void *pv, size_t size)
751 qemu_get_sbe64s(f, v);
755 static void put_int64(QEMUFile *f, const void *pv, size_t size)
757 const int64_t *v = pv;
758 qemu_put_sbe64s(f, v);
761 const VMStateInfo vmstate_info_int64 = {
767 /* 8 bit unsigned int */
769 static int get_uint8(QEMUFile *f, void *pv, size_t size)
776 static void put_uint8(QEMUFile *f, const void *pv, size_t size)
778 const uint8_t *v = pv;
782 const VMStateInfo vmstate_info_uint8 = {
788 /* 16 bit unsigned int */
790 static int get_uint16(QEMUFile *f, void *pv, size_t size)
793 qemu_get_be16s(f, v);
797 static void put_uint16(QEMUFile *f, const void *pv, size_t size)
799 const uint16_t *v = pv;
800 qemu_put_be16s(f, v);
803 const VMStateInfo vmstate_info_uint16 = {
809 /* 32 bit unsigned int */
811 static int get_uint32(QEMUFile *f, void *pv, size_t size)
814 qemu_get_be32s(f, v);
818 static void put_uint32(QEMUFile *f, const void *pv, size_t size)
820 const uint32_t *v = pv;
821 qemu_put_be32s(f, v);
824 const VMStateInfo vmstate_info_uint32 = {
830 /* 64 bit unsigned int */
832 static int get_uint64(QEMUFile *f, void *pv, size_t size)
835 qemu_get_be64s(f, v);
839 static void put_uint64(QEMUFile *f, const void *pv, size_t size)
841 const uint64_t *v = pv;
842 qemu_put_be64s(f, v);
845 const VMStateInfo vmstate_info_uint64 = {
851 /* 8 bit int. See that the received value is the same than the one
854 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
865 const VMStateInfo vmstate_info_uint8_equal = {
866 .name = "int32 equal",
867 .get = get_uint8_equal,
873 static int get_timer(QEMUFile *f, void *pv, size_t size)
876 qemu_get_timer(f, v);
880 static void put_timer(QEMUFile *f, const void *pv, size_t size)
882 QEMUTimer *v = (void *)pv;
883 qemu_put_timer(f, v);
886 const VMStateInfo vmstate_info_timer = {
892 /* uint8_t buffers */
894 static int get_buffer(QEMUFile *f, void *pv, size_t size)
897 qemu_get_buffer(f, v, size);
901 static void put_buffer(QEMUFile *f, const void *pv, size_t size)
903 uint8_t *v = (void *)pv;
904 qemu_put_buffer(f, v, size);
907 const VMStateInfo vmstate_info_buffer = {
913 typedef struct SaveStateEntry {
914 QTAILQ_ENTRY(SaveStateEntry) entry;
919 SaveLiveStateHandler *save_live_state;
920 SaveStateHandler *save_state;
921 LoadStateHandler *load_state;
922 const VMStateDescription *vmsd;
926 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
927 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
928 static int global_section_id;
930 static int calculate_new_instance_id(const char *idstr)
935 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
936 if (strcmp(idstr, se->idstr) == 0
937 && instance_id <= se->instance_id) {
938 instance_id = se->instance_id + 1;
944 /* TODO: Individual devices generally have very little idea about the rest
945 of the system, so instance_id should be removed/replaced.
946 Meanwhile pass -1 as instance_id if you do not already have a clearly
947 distinguishing id for all instances of your device class. */
948 int register_savevm_live(const char *idstr,
951 SaveLiveStateHandler *save_live_state,
952 SaveStateHandler *save_state,
953 LoadStateHandler *load_state,
958 se = qemu_malloc(sizeof(SaveStateEntry));
959 pstrcpy(se->idstr, sizeof(se->idstr), idstr);
960 se->version_id = version_id;
961 se->section_id = global_section_id++;
962 se->save_live_state = save_live_state;
963 se->save_state = save_state;
964 se->load_state = load_state;
968 if (instance_id == -1) {
969 se->instance_id = calculate_new_instance_id(idstr);
971 se->instance_id = instance_id;
973 /* add at the end of list */
974 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
978 int register_savevm(const char *idstr,
981 SaveStateHandler *save_state,
982 LoadStateHandler *load_state,
985 return register_savevm_live(idstr, instance_id, version_id,
986 NULL, save_state, load_state, opaque);
989 void unregister_savevm(const char *idstr, void *opaque)
991 SaveStateEntry *se, *new_se;
993 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
994 if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
995 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1001 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1006 se = qemu_malloc(sizeof(SaveStateEntry));
1007 pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1008 se->version_id = vmsd->version_id;
1009 se->section_id = global_section_id++;
1010 se->save_live_state = NULL;
1011 se->save_state = NULL;
1012 se->load_state = NULL;
1013 se->opaque = opaque;
1016 if (instance_id == -1) {
1017 se->instance_id = calculate_new_instance_id(vmsd->name);
1019 se->instance_id = instance_id;
1021 /* add at the end of list */
1022 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1026 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1028 SaveStateEntry *se, *new_se;
1030 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1031 if (se->vmsd == vmsd && se->opaque == opaque) {
1032 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1038 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1039 void *opaque, int version_id)
1041 VMStateField *field = vmsd->fields;
1043 if (version_id > vmsd->version_id) {
1046 if (version_id < vmsd->minimum_version_id_old) {
1049 if (version_id < vmsd->minimum_version_id) {
1050 return vmsd->load_state_old(f, opaque, version_id);
1052 if (vmsd->pre_load) {
1053 int ret = vmsd->pre_load(opaque);
1057 while(field->name) {
1058 if (field->version_id <= version_id) {
1059 void *base_addr = opaque + field->offset;
1060 int ret, i, n_elems = 1;
1062 if (field->flags & VMS_ARRAY) {
1063 n_elems = field->num;
1064 } else if (field->flags & VMS_VARRAY) {
1065 n_elems = *(size_t *)(opaque+field->num_offset);
1067 if (field->flags & VMS_POINTER) {
1068 base_addr = *(void **)base_addr;
1070 for (i = 0; i < n_elems; i++) {
1071 void *addr = base_addr + field->size * i;
1073 if (field->flags & VMS_STRUCT) {
1074 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1076 ret = field->info->get(f, addr, field->size);
1086 if (vmsd->post_load) {
1087 return vmsd->post_load(opaque);
1092 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1095 VMStateField *field = vmsd->fields;
1097 if (vmsd->pre_save) {
1098 vmsd->pre_save(opaque);
1100 while(field->name) {
1101 const void *base_addr = opaque + field->offset;
1104 if (field->flags & VMS_ARRAY) {
1105 n_elems = field->num;
1106 } else if (field->flags & VMS_VARRAY) {
1107 n_elems = *(size_t *)(opaque+field->num_offset);
1109 if (field->flags & VMS_POINTER) {
1110 base_addr = *(void **)base_addr;
1112 for (i = 0; i < n_elems; i++) {
1113 const void *addr = base_addr + field->size * i;
1115 if (field->flags & VMS_STRUCT) {
1116 vmstate_save_state(f, field->vmsd, addr);
1118 field->info->put(f, addr, field->size);
1123 if (vmsd->post_save) {
1124 vmsd->post_save(opaque);
1128 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1130 if (!se->vmsd) { /* Old style */
1131 return se->load_state(f, se->opaque, version_id);
1133 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1136 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1138 if (!se->vmsd) { /* Old style */
1139 se->save_state(f, se->opaque);
1142 vmstate_save_state(f,se->vmsd, se->opaque);
1145 #define QEMU_VM_FILE_MAGIC 0x5145564d
1146 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1147 #define QEMU_VM_FILE_VERSION 0x00000003
1149 #define QEMU_VM_EOF 0x00
1150 #define QEMU_VM_SECTION_START 0x01
1151 #define QEMU_VM_SECTION_PART 0x02
1152 #define QEMU_VM_SECTION_END 0x03
1153 #define QEMU_VM_SECTION_FULL 0x04
1155 int qemu_savevm_state_begin(QEMUFile *f)
1159 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1160 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1162 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1165 if (se->save_live_state == NULL)
1169 qemu_put_byte(f, QEMU_VM_SECTION_START);
1170 qemu_put_be32(f, se->section_id);
1173 len = strlen(se->idstr);
1174 qemu_put_byte(f, len);
1175 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1177 qemu_put_be32(f, se->instance_id);
1178 qemu_put_be32(f, se->version_id);
1180 se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1183 if (qemu_file_has_error(f))
1189 int qemu_savevm_state_iterate(QEMUFile *f)
1194 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1195 if (se->save_live_state == NULL)
1199 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1200 qemu_put_be32(f, se->section_id);
1202 ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1208 if (qemu_file_has_error(f))
1214 int qemu_savevm_state_complete(QEMUFile *f)
1218 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1219 if (se->save_live_state == NULL)
1223 qemu_put_byte(f, QEMU_VM_SECTION_END);
1224 qemu_put_be32(f, se->section_id);
1226 se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1229 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1232 if (se->save_state == NULL && se->vmsd == NULL)
1236 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1237 qemu_put_be32(f, se->section_id);
1240 len = strlen(se->idstr);
1241 qemu_put_byte(f, len);
1242 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1244 qemu_put_be32(f, se->instance_id);
1245 qemu_put_be32(f, se->version_id);
1247 vmstate_save(f, se);
1250 qemu_put_byte(f, QEMU_VM_EOF);
1252 if (qemu_file_has_error(f))
1258 int qemu_savevm_state(QEMUFile *f)
1260 int saved_vm_running;
1263 saved_vm_running = vm_running;
1268 ret = qemu_savevm_state_begin(f);
1273 ret = qemu_savevm_state_iterate(f);
1278 ret = qemu_savevm_state_complete(f);
1281 if (qemu_file_has_error(f))
1284 if (!ret && saved_vm_running)
1290 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1294 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1295 if (!strcmp(se->idstr, idstr) &&
1296 instance_id == se->instance_id)
1302 typedef struct LoadStateEntry {
1303 QLIST_ENTRY(LoadStateEntry) entry;
1309 int qemu_loadvm_state(QEMUFile *f)
1311 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1312 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1313 LoadStateEntry *le, *new_le;
1314 uint8_t section_type;
1318 v = qemu_get_be32(f);
1319 if (v != QEMU_VM_FILE_MAGIC)
1322 v = qemu_get_be32(f);
1323 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1324 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1327 if (v != QEMU_VM_FILE_VERSION)
1330 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1331 uint32_t instance_id, version_id, section_id;
1336 switch (section_type) {
1337 case QEMU_VM_SECTION_START:
1338 case QEMU_VM_SECTION_FULL:
1339 /* Read section start */
1340 section_id = qemu_get_be32(f);
1341 len = qemu_get_byte(f);
1342 qemu_get_buffer(f, (uint8_t *)idstr, len);
1344 instance_id = qemu_get_be32(f);
1345 version_id = qemu_get_be32(f);
1347 /* Find savevm section */
1348 se = find_se(idstr, instance_id);
1350 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1355 /* Validate version */
1356 if (version_id > se->version_id) {
1357 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1358 version_id, idstr, se->version_id);
1364 le = qemu_mallocz(sizeof(*le));
1367 le->section_id = section_id;
1368 le->version_id = version_id;
1369 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1371 ret = vmstate_load(f, le->se, le->version_id);
1373 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1374 instance_id, idstr);
1378 case QEMU_VM_SECTION_PART:
1379 case QEMU_VM_SECTION_END:
1380 section_id = qemu_get_be32(f);
1382 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1383 if (le->section_id == section_id) {
1388 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1393 ret = vmstate_load(f, le->se, le->version_id);
1395 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1401 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1410 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1411 QLIST_REMOVE(le, entry);
1415 if (qemu_file_has_error(f))
1421 /* device can contain snapshots */
1422 static int bdrv_can_snapshot(BlockDriverState *bs)
1425 !bdrv_is_removable(bs) &&
1426 !bdrv_is_read_only(bs));
1429 /* device must be snapshots in order to have a reliable snapshot */
1430 static int bdrv_has_snapshot(BlockDriverState *bs)
1433 !bdrv_is_removable(bs) &&
1434 !bdrv_is_read_only(bs));
1437 static BlockDriverState *get_bs_snapshots(void)
1439 BlockDriverState *bs;
1443 return bs_snapshots;
1444 QTAILQ_FOREACH(dinfo, &drives, next) {
1446 if (bdrv_can_snapshot(bs))
1455 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1458 QEMUSnapshotInfo *sn_tab, *sn;
1462 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1465 for(i = 0; i < nb_sns; i++) {
1467 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1477 void do_savevm(Monitor *mon, const QDict *qdict)
1480 BlockDriverState *bs, *bs1;
1481 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1482 int must_delete, ret;
1484 int saved_vm_running;
1485 uint32_t vm_state_size;
1491 const char *name = qdict_get_try_str(qdict, "name");
1493 bs = get_bs_snapshots();
1495 monitor_printf(mon, "No block device can accept snapshots\n");
1499 /* ??? Should this occur after vm_stop? */
1502 saved_vm_running = vm_running;
1507 ret = bdrv_snapshot_find(bs, old_sn, name);
1512 memset(sn, 0, sizeof(*sn));
1514 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1515 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1518 pstrcpy(sn->name, sizeof(sn->name), name);
1521 /* fill auxiliary fields */
1524 sn->date_sec = tb.time;
1525 sn->date_nsec = tb.millitm * 1000000;
1527 gettimeofday(&tv, NULL);
1528 sn->date_sec = tv.tv_sec;
1529 sn->date_nsec = tv.tv_usec * 1000;
1531 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1533 /* save the VM state */
1534 f = qemu_fopen_bdrv(bs, 1);
1536 monitor_printf(mon, "Could not open VM state file\n");
1539 ret = qemu_savevm_state(f);
1540 vm_state_size = qemu_ftell(f);
1543 monitor_printf(mon, "Error %d while writing VM\n", ret);
1547 /* create the snapshots */
1549 QTAILQ_FOREACH(dinfo, &drives, next) {
1551 if (bdrv_has_snapshot(bs1)) {
1553 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1556 "Error while deleting snapshot on '%s'\n",
1557 bdrv_get_device_name(bs1));
1560 /* Write VM state size only to the image that contains the state */
1561 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1562 ret = bdrv_snapshot_create(bs1, sn);
1564 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1565 bdrv_get_device_name(bs1));
1571 if (saved_vm_running)
1575 int load_vmstate(Monitor *mon, const char *name)
1578 BlockDriverState *bs, *bs1;
1579 QEMUSnapshotInfo sn;
1583 bs = get_bs_snapshots();
1585 monitor_printf(mon, "No block device supports snapshots\n");
1589 /* Flush all IO requests so they don't interfere with the new state. */
1592 QTAILQ_FOREACH(dinfo, &drives, next) {
1594 if (bdrv_has_snapshot(bs1)) {
1595 ret = bdrv_snapshot_goto(bs1, name);
1598 monitor_printf(mon, "Warning: ");
1602 "Snapshots not supported on device '%s'\n",
1603 bdrv_get_device_name(bs1));
1606 monitor_printf(mon, "Could not find snapshot '%s' on "
1608 name, bdrv_get_device_name(bs1));
1611 monitor_printf(mon, "Error %d while activating snapshot on"
1612 " '%s'\n", ret, bdrv_get_device_name(bs1));
1615 /* fatal on snapshot block device */
1622 /* Don't even try to load empty VM states */
1623 ret = bdrv_snapshot_find(bs, &sn, name);
1624 if ((ret >= 0) && (sn.vm_state_size == 0))
1627 /* restore the VM state */
1628 f = qemu_fopen_bdrv(bs, 0);
1630 monitor_printf(mon, "Could not open VM state file\n");
1633 ret = qemu_loadvm_state(f);
1636 monitor_printf(mon, "Error %d while loading VM state\n", ret);
1642 void do_delvm(Monitor *mon, const QDict *qdict)
1645 BlockDriverState *bs, *bs1;
1647 const char *name = qdict_get_str(qdict, "name");
1649 bs = get_bs_snapshots();
1651 monitor_printf(mon, "No block device supports snapshots\n");
1655 QTAILQ_FOREACH(dinfo, &drives, next) {
1657 if (bdrv_has_snapshot(bs1)) {
1658 ret = bdrv_snapshot_delete(bs1, name);
1660 if (ret == -ENOTSUP)
1662 "Snapshots not supported on device '%s'\n",
1663 bdrv_get_device_name(bs1));
1665 monitor_printf(mon, "Error %d while deleting snapshot on "
1666 "'%s'\n", ret, bdrv_get_device_name(bs1));
1672 void do_info_snapshots(Monitor *mon)
1675 BlockDriverState *bs, *bs1;
1676 QEMUSnapshotInfo *sn_tab, *sn;
1680 bs = get_bs_snapshots();
1682 monitor_printf(mon, "No available block device supports snapshots\n");
1685 monitor_printf(mon, "Snapshot devices:");
1686 QTAILQ_FOREACH(dinfo, &drives, next) {
1688 if (bdrv_has_snapshot(bs1)) {
1690 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1693 monitor_printf(mon, "\n");
1695 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1697 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1700 monitor_printf(mon, "Snapshot list (from %s):\n",
1701 bdrv_get_device_name(bs));
1702 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1703 for(i = 0; i < nb_sns; i++) {
1705 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));