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"
94 /* point to the block driver where the snapshots are managed */
95 static BlockDriverState *bs_snapshots;
97 #define SELF_ANNOUNCE_ROUNDS 5
98 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
99 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
100 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
102 static int announce_self_create(uint8_t *buf,
105 uint32_t magic = EXPERIMENTAL_MAGIC;
106 uint16_t proto = htons(ETH_P_EXPERIMENTAL);
108 /* FIXME: should we send a different packet (arp/rarp/ping)? */
111 memset(buf, 0xff, 6); /* h_dst */
112 memcpy(buf + 6, mac_addr, 6); /* h_src */
113 memcpy(buf + 12, &proto, 2); /* h_proto */
114 memcpy(buf + 14, &magic, 4); /* magic */
119 static void qemu_announce_self_once(void *opaque)
125 static int count = SELF_ANNOUNCE_ROUNDS;
126 QEMUTimer *timer = *(QEMUTimer **)opaque;
128 for (i = 0; i < MAX_NICS; i++) {
129 if (!nd_table[i].used)
131 len = announce_self_create(buf, nd_table[i].macaddr);
132 vlan = nd_table[i].vlan;
133 for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
134 vc->receive(vc, buf, len);
138 qemu_mod_timer(timer, qemu_get_clock(rt_clock) + 100);
140 qemu_del_timer(timer);
141 qemu_free_timer(timer);
145 void qemu_announce_self(void)
147 static QEMUTimer *timer;
148 timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
149 qemu_announce_self_once(&timer);
152 /***********************************************************/
153 /* savevm/loadvm support */
155 #define IO_BUF_SIZE 32768
158 QEMUFilePutBufferFunc *put_buffer;
159 QEMUFileGetBufferFunc *get_buffer;
160 QEMUFileCloseFunc *close;
161 QEMUFileRateLimit *rate_limit;
162 QEMUFileSetRateLimit *set_rate_limit;
166 int64_t buf_offset; /* start of buffer when writing, end of buffer
169 int buf_size; /* 0 when writing */
170 uint8_t buf[IO_BUF_SIZE];
175 typedef struct QEMUFileStdio
181 typedef struct QEMUFileSocket
187 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
189 QEMUFileSocket *s = opaque;
193 len = recv(s->fd, (void *)buf, size, 0);
194 } while (len == -1 && socket_error() == EINTR);
197 len = -socket_error();
202 static int socket_close(void *opaque)
204 QEMUFileSocket *s = opaque;
209 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
211 QEMUFileStdio *s = opaque;
212 return fwrite(buf, 1, size, s->stdio_file);
215 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
217 QEMUFileStdio *s = opaque;
218 FILE *fp = s->stdio_file;
223 bytes = fread(buf, 1, size, fp);
224 } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
228 static int stdio_pclose(void *opaque)
230 QEMUFileStdio *s = opaque;
231 pclose(s->stdio_file);
236 static int stdio_fclose(void *opaque)
238 QEMUFileStdio *s = opaque;
239 fclose(s->stdio_file);
244 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
248 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
249 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
253 s = qemu_mallocz(sizeof(QEMUFileStdio));
255 s->stdio_file = stdio_file;
258 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
260 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, NULL, NULL);
265 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
269 popen_file = popen(command, mode);
270 if(popen_file == NULL) {
274 return qemu_popen(popen_file, mode);
277 int qemu_stdio_fd(QEMUFile *f)
282 p = (QEMUFileStdio *)f->opaque;
283 fd = fileno(p->stdio_file);
288 QEMUFile *qemu_fdopen(int fd, const char *mode)
293 (mode[0] != 'r' && mode[0] != 'w') ||
294 mode[1] != 'b' || mode[2] != 0) {
295 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
299 s = qemu_mallocz(sizeof(QEMUFileStdio));
300 s->stdio_file = fdopen(fd, mode);
305 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, NULL, NULL);
307 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, NULL, NULL);
316 QEMUFile *qemu_fopen_socket(int fd)
318 QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
321 s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL, NULL);
325 static int file_put_buffer(void *opaque, const uint8_t *buf,
326 int64_t pos, int size)
328 QEMUFileStdio *s = opaque;
329 fseek(s->stdio_file, pos, SEEK_SET);
330 fwrite(buf, 1, size, s->stdio_file);
334 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
336 QEMUFileStdio *s = opaque;
337 fseek(s->stdio_file, pos, SEEK_SET);
338 return fread(buf, 1, size, s->stdio_file);
341 QEMUFile *qemu_fopen(const char *filename, const char *mode)
346 (mode[0] != 'r' && mode[0] != 'w') ||
347 mode[1] != 'b' || mode[2] != 0) {
348 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
352 s = qemu_mallocz(sizeof(QEMUFileStdio));
354 s->stdio_file = fopen(filename, mode);
359 s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, NULL, NULL);
361 s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
369 static int block_put_buffer(void *opaque, const uint8_t *buf,
370 int64_t pos, int size)
372 bdrv_save_vmstate(opaque, buf, pos, size);
376 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
378 return bdrv_load_vmstate(opaque, buf, pos, size);
381 static int bdrv_fclose(void *opaque)
386 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
389 return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
390 return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
393 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
394 QEMUFileGetBufferFunc *get_buffer,
395 QEMUFileCloseFunc *close,
396 QEMUFileRateLimit *rate_limit,
397 QEMUFileSetRateLimit *set_rate_limit)
401 f = qemu_mallocz(sizeof(QEMUFile));
404 f->put_buffer = put_buffer;
405 f->get_buffer = get_buffer;
407 f->rate_limit = rate_limit;
408 f->set_rate_limit = set_rate_limit;
414 int qemu_file_has_error(QEMUFile *f)
419 void qemu_file_set_error(QEMUFile *f)
424 void qemu_fflush(QEMUFile *f)
429 if (f->is_write && f->buf_index > 0) {
432 len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
434 f->buf_offset += f->buf_index;
441 static void qemu_fill_buffer(QEMUFile *f)
451 len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
455 f->buf_offset += len;
456 } else if (len != -EAGAIN)
460 int qemu_fclose(QEMUFile *f)
465 ret = f->close(f->opaque);
470 void qemu_file_put_notify(QEMUFile *f)
472 f->put_buffer(f->opaque, NULL, 0, 0);
475 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
479 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
481 "Attempted to write to buffer while read buffer is not empty\n");
485 while (!f->has_error && size > 0) {
486 l = IO_BUF_SIZE - f->buf_index;
489 memcpy(f->buf + f->buf_index, buf, l);
494 if (f->buf_index >= IO_BUF_SIZE)
499 void qemu_put_byte(QEMUFile *f, int v)
501 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
503 "Attempted to write to buffer while read buffer is not empty\n");
507 f->buf[f->buf_index++] = v;
509 if (f->buf_index >= IO_BUF_SIZE)
513 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
522 l = f->buf_size - f->buf_index;
525 l = f->buf_size - f->buf_index;
531 memcpy(buf, f->buf + f->buf_index, l);
539 int qemu_get_byte(QEMUFile *f)
544 if (f->buf_index >= f->buf_size) {
546 if (f->buf_index >= f->buf_size)
549 return f->buf[f->buf_index++];
552 int64_t qemu_ftell(QEMUFile *f)
554 return f->buf_offset - f->buf_size + f->buf_index;
557 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
559 if (whence == SEEK_SET) {
561 } else if (whence == SEEK_CUR) {
562 pos += qemu_ftell(f);
564 /* SEEK_END not supported */
578 int qemu_file_rate_limit(QEMUFile *f)
581 return f->rate_limit(f->opaque);
586 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
588 /* any failed or completed migration keeps its state to allow probing of
589 * migration data, but has no associated file anymore */
590 if (f && f->set_rate_limit)
591 return f->set_rate_limit(f->opaque, new_rate);
596 void qemu_put_be16(QEMUFile *f, unsigned int v)
598 qemu_put_byte(f, v >> 8);
602 void qemu_put_be32(QEMUFile *f, unsigned int v)
604 qemu_put_byte(f, v >> 24);
605 qemu_put_byte(f, v >> 16);
606 qemu_put_byte(f, v >> 8);
610 void qemu_put_be64(QEMUFile *f, uint64_t v)
612 qemu_put_be32(f, v >> 32);
616 unsigned int qemu_get_be16(QEMUFile *f)
619 v = qemu_get_byte(f) << 8;
620 v |= qemu_get_byte(f);
624 unsigned int qemu_get_be32(QEMUFile *f)
627 v = qemu_get_byte(f) << 24;
628 v |= qemu_get_byte(f) << 16;
629 v |= qemu_get_byte(f) << 8;
630 v |= qemu_get_byte(f);
634 uint64_t qemu_get_be64(QEMUFile *f)
637 v = (uint64_t)qemu_get_be32(f) << 32;
638 v |= qemu_get_be32(f);
644 static int get_int8(QEMUFile *f, void *pv, size_t size)
651 static void put_int8(QEMUFile *f, const void *pv, size_t size)
653 const int8_t *v = pv;
657 const VMStateInfo vmstate_info_int8 = {
665 static int get_int16(QEMUFile *f, void *pv, size_t size)
668 qemu_get_sbe16s(f, v);
672 static void put_int16(QEMUFile *f, const void *pv, size_t size)
674 const int16_t *v = pv;
675 qemu_put_sbe16s(f, v);
678 const VMStateInfo vmstate_info_int16 = {
686 static int get_int32(QEMUFile *f, void *pv, size_t size)
689 qemu_get_sbe32s(f, v);
693 static void put_int32(QEMUFile *f, const void *pv, size_t size)
695 const int32_t *v = pv;
696 qemu_put_sbe32s(f, v);
699 const VMStateInfo vmstate_info_int32 = {
705 /* 32 bit int. See that the received value is the same than the one
708 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
712 qemu_get_sbe32s(f, &v2);
719 const VMStateInfo vmstate_info_int32_equal = {
720 .name = "int32 equal",
721 .get = get_int32_equal,
725 /* 32 bit int. See that the received value is the less or the same
726 than the one in the field */
728 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
732 qemu_get_sbe32s(f, &new);
739 const VMStateInfo vmstate_info_int32_le = {
740 .name = "int32 equal",
747 static int get_int64(QEMUFile *f, void *pv, size_t size)
750 qemu_get_sbe64s(f, v);
754 static void put_int64(QEMUFile *f, const void *pv, size_t size)
756 const int64_t *v = pv;
757 qemu_put_sbe64s(f, v);
760 const VMStateInfo vmstate_info_int64 = {
766 /* 8 bit unsigned int */
768 static int get_uint8(QEMUFile *f, void *pv, size_t size)
775 static void put_uint8(QEMUFile *f, const void *pv, size_t size)
777 const uint8_t *v = pv;
781 const VMStateInfo vmstate_info_uint8 = {
787 /* 16 bit unsigned int */
789 static int get_uint16(QEMUFile *f, void *pv, size_t size)
792 qemu_get_be16s(f, v);
796 static void put_uint16(QEMUFile *f, const void *pv, size_t size)
798 const uint16_t *v = pv;
799 qemu_put_be16s(f, v);
802 const VMStateInfo vmstate_info_uint16 = {
808 /* 32 bit unsigned int */
810 static int get_uint32(QEMUFile *f, void *pv, size_t size)
813 qemu_get_be32s(f, v);
817 static void put_uint32(QEMUFile *f, const void *pv, size_t size)
819 const uint32_t *v = pv;
820 qemu_put_be32s(f, v);
823 const VMStateInfo vmstate_info_uint32 = {
829 /* 64 bit unsigned int */
831 static int get_uint64(QEMUFile *f, void *pv, size_t size)
834 qemu_get_be64s(f, v);
838 static void put_uint64(QEMUFile *f, const void *pv, size_t size)
840 const uint64_t *v = pv;
841 qemu_put_be64s(f, v);
844 const VMStateInfo vmstate_info_uint64 = {
850 /* 8 bit int. See that the received value is the same than the one
853 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
864 const VMStateInfo vmstate_info_uint8_equal = {
865 .name = "int32 equal",
866 .get = get_uint8_equal,
872 static int get_timer(QEMUFile *f, void *pv, size_t size)
875 qemu_get_timer(f, v);
879 static void put_timer(QEMUFile *f, const void *pv, size_t size)
881 QEMUTimer *v = (void *)pv;
882 qemu_put_timer(f, v);
885 const VMStateInfo vmstate_info_timer = {
891 /* uint8_t buffers */
893 static int get_buffer(QEMUFile *f, void *pv, size_t size)
896 qemu_get_buffer(f, v, size);
900 static void put_buffer(QEMUFile *f, const void *pv, size_t size)
902 uint8_t *v = (void *)pv;
903 qemu_put_buffer(f, v, size);
906 const VMStateInfo vmstate_info_buffer = {
912 typedef struct SaveStateEntry {
913 TAILQ_ENTRY(SaveStateEntry) entry;
918 SaveLiveStateHandler *save_live_state;
919 SaveStateHandler *save_state;
920 LoadStateHandler *load_state;
921 const VMStateDescription *vmsd;
925 static TAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
926 TAILQ_HEAD_INITIALIZER(savevm_handlers);
927 static int global_section_id;
929 static int calculate_new_instance_id(const char *idstr)
934 TAILQ_FOREACH(se, &savevm_handlers, entry) {
935 if (strcmp(idstr, se->idstr) == 0
936 && instance_id <= se->instance_id) {
937 instance_id = se->instance_id + 1;
943 /* TODO: Individual devices generally have very little idea about the rest
944 of the system, so instance_id should be removed/replaced.
945 Meanwhile pass -1 as instance_id if you do not already have a clearly
946 distinguishing id for all instances of your device class. */
947 int register_savevm_live(const char *idstr,
950 SaveLiveStateHandler *save_live_state,
951 SaveStateHandler *save_state,
952 LoadStateHandler *load_state,
957 se = qemu_malloc(sizeof(SaveStateEntry));
958 pstrcpy(se->idstr, sizeof(se->idstr), idstr);
959 se->version_id = version_id;
960 se->section_id = global_section_id++;
961 se->save_live_state = save_live_state;
962 se->save_state = save_state;
963 se->load_state = load_state;
967 if (instance_id == -1) {
968 se->instance_id = calculate_new_instance_id(idstr);
970 se->instance_id = instance_id;
972 /* add at the end of list */
973 TAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
977 int register_savevm(const char *idstr,
980 SaveStateHandler *save_state,
981 LoadStateHandler *load_state,
984 return register_savevm_live(idstr, instance_id, version_id,
985 NULL, save_state, load_state, opaque);
988 void unregister_savevm(const char *idstr, void *opaque)
990 SaveStateEntry *se, *new_se;
992 TAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
993 if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
994 TAILQ_REMOVE(&savevm_handlers, se, entry);
1000 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1005 se = qemu_malloc(sizeof(SaveStateEntry));
1006 pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1007 se->version_id = vmsd->version_id;
1008 se->section_id = global_section_id++;
1009 se->save_live_state = NULL;
1010 se->save_state = NULL;
1011 se->load_state = NULL;
1012 se->opaque = opaque;
1015 if (instance_id == -1) {
1016 se->instance_id = calculate_new_instance_id(vmsd->name);
1018 se->instance_id = instance_id;
1020 /* add at the end of list */
1021 TAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1025 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1027 SaveStateEntry *se, *new_se;
1029 TAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1030 if (se->vmsd == vmsd && se->opaque == opaque) {
1031 TAILQ_REMOVE(&savevm_handlers, se, entry);
1037 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1038 void *opaque, int version_id)
1040 VMStateField *field = vmsd->fields;
1042 if (version_id > vmsd->version_id) {
1045 if (version_id < vmsd->minimum_version_id_old) {
1048 if (version_id < vmsd->minimum_version_id) {
1049 return vmsd->load_state_old(f, opaque, version_id);
1051 if (vmsd->pre_load) {
1052 int ret = vmsd->pre_load(opaque);
1056 while(field->name) {
1057 if (field->version_id <= version_id) {
1058 void *base_addr = opaque + field->offset;
1059 int ret, i, n_elems = 1;
1061 if (field->flags & VMS_ARRAY) {
1062 n_elems = field->num;
1063 } else if (field->flags & VMS_VARRAY) {
1064 n_elems = *(size_t *)(opaque+field->num_offset);
1066 if (field->flags & VMS_POINTER) {
1067 base_addr = *(void **)base_addr;
1069 for (i = 0; i < n_elems; i++) {
1070 void *addr = base_addr + field->size * i;
1072 if (field->flags & VMS_STRUCT) {
1073 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1075 ret = field->info->get(f, addr, field->size);
1085 if (vmsd->post_load) {
1086 return vmsd->post_load(opaque);
1091 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1094 VMStateField *field = vmsd->fields;
1096 if (vmsd->pre_save) {
1097 vmsd->pre_save(opaque);
1099 while(field->name) {
1100 const void *base_addr = opaque + field->offset;
1103 if (field->flags & VMS_ARRAY) {
1104 n_elems = field->num;
1105 } else if (field->flags & VMS_VARRAY) {
1106 n_elems = *(size_t *)(opaque+field->num_offset);
1108 if (field->flags & VMS_POINTER) {
1109 base_addr = *(void **)base_addr;
1111 for (i = 0; i < n_elems; i++) {
1112 const void *addr = base_addr + field->size * i;
1114 if (field->flags & VMS_STRUCT) {
1115 vmstate_save_state(f, field->vmsd, addr);
1117 field->info->put(f, addr, field->size);
1122 if (vmsd->post_save) {
1123 vmsd->post_save(opaque);
1127 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1129 if (!se->vmsd) { /* Old style */
1130 return se->load_state(f, se->opaque, version_id);
1132 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1135 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1137 if (!se->vmsd) { /* Old style */
1138 se->save_state(f, se->opaque);
1141 vmstate_save_state(f,se->vmsd, se->opaque);
1144 #define QEMU_VM_FILE_MAGIC 0x5145564d
1145 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1146 #define QEMU_VM_FILE_VERSION 0x00000003
1148 #define QEMU_VM_EOF 0x00
1149 #define QEMU_VM_SECTION_START 0x01
1150 #define QEMU_VM_SECTION_PART 0x02
1151 #define QEMU_VM_SECTION_END 0x03
1152 #define QEMU_VM_SECTION_FULL 0x04
1154 int qemu_savevm_state_begin(QEMUFile *f)
1158 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1159 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1161 TAILQ_FOREACH(se, &savevm_handlers, entry) {
1164 if (se->save_live_state == NULL)
1168 qemu_put_byte(f, QEMU_VM_SECTION_START);
1169 qemu_put_be32(f, se->section_id);
1172 len = strlen(se->idstr);
1173 qemu_put_byte(f, len);
1174 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1176 qemu_put_be32(f, se->instance_id);
1177 qemu_put_be32(f, se->version_id);
1179 se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1182 if (qemu_file_has_error(f))
1188 int qemu_savevm_state_iterate(QEMUFile *f)
1193 TAILQ_FOREACH(se, &savevm_handlers, entry) {
1194 if (se->save_live_state == NULL)
1198 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1199 qemu_put_be32(f, se->section_id);
1201 ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1207 if (qemu_file_has_error(f))
1213 int qemu_savevm_state_complete(QEMUFile *f)
1217 TAILQ_FOREACH(se, &savevm_handlers, entry) {
1218 if (se->save_live_state == NULL)
1222 qemu_put_byte(f, QEMU_VM_SECTION_END);
1223 qemu_put_be32(f, se->section_id);
1225 se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1228 TAILQ_FOREACH(se, &savevm_handlers, entry) {
1231 if (se->save_state == NULL && se->vmsd == NULL)
1235 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1236 qemu_put_be32(f, se->section_id);
1239 len = strlen(se->idstr);
1240 qemu_put_byte(f, len);
1241 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1243 qemu_put_be32(f, se->instance_id);
1244 qemu_put_be32(f, se->version_id);
1246 vmstate_save(f, se);
1249 qemu_put_byte(f, QEMU_VM_EOF);
1251 if (qemu_file_has_error(f))
1257 int qemu_savevm_state(QEMUFile *f)
1259 int saved_vm_running;
1262 saved_vm_running = vm_running;
1267 ret = qemu_savevm_state_begin(f);
1272 ret = qemu_savevm_state_iterate(f);
1277 ret = qemu_savevm_state_complete(f);
1280 if (qemu_file_has_error(f))
1283 if (!ret && saved_vm_running)
1289 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1293 TAILQ_FOREACH(se, &savevm_handlers, entry) {
1294 if (!strcmp(se->idstr, idstr) &&
1295 instance_id == se->instance_id)
1301 typedef struct LoadStateEntry {
1302 LIST_ENTRY(LoadStateEntry) entry;
1308 int qemu_loadvm_state(QEMUFile *f)
1310 LIST_HEAD(, LoadStateEntry) loadvm_handlers =
1311 LIST_HEAD_INITIALIZER(loadvm_handlers);
1312 LoadStateEntry *le, *new_le;
1313 uint8_t section_type;
1317 v = qemu_get_be32(f);
1318 if (v != QEMU_VM_FILE_MAGIC)
1321 v = qemu_get_be32(f);
1322 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1323 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1326 if (v != QEMU_VM_FILE_VERSION)
1329 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1330 uint32_t instance_id, version_id, section_id;
1335 switch (section_type) {
1336 case QEMU_VM_SECTION_START:
1337 case QEMU_VM_SECTION_FULL:
1338 /* Read section start */
1339 section_id = qemu_get_be32(f);
1340 len = qemu_get_byte(f);
1341 qemu_get_buffer(f, (uint8_t *)idstr, len);
1343 instance_id = qemu_get_be32(f);
1344 version_id = qemu_get_be32(f);
1346 /* Find savevm section */
1347 se = find_se(idstr, instance_id);
1349 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1354 /* Validate version */
1355 if (version_id > se->version_id) {
1356 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1357 version_id, idstr, se->version_id);
1363 le = qemu_mallocz(sizeof(*le));
1366 le->section_id = section_id;
1367 le->version_id = version_id;
1368 LIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1370 ret = vmstate_load(f, le->se, le->version_id);
1372 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1373 instance_id, idstr);
1377 case QEMU_VM_SECTION_PART:
1378 case QEMU_VM_SECTION_END:
1379 section_id = qemu_get_be32(f);
1381 LIST_FOREACH(le, &loadvm_handlers, entry) {
1382 if (le->section_id == section_id) {
1387 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1392 ret = vmstate_load(f, le->se, le->version_id);
1394 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1400 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1409 LIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1410 LIST_REMOVE(le, entry);
1414 if (qemu_file_has_error(f))
1420 /* device can contain snapshots */
1421 static int bdrv_can_snapshot(BlockDriverState *bs)
1424 !bdrv_is_removable(bs) &&
1425 !bdrv_is_read_only(bs));
1428 /* device must be snapshots in order to have a reliable snapshot */
1429 static int bdrv_has_snapshot(BlockDriverState *bs)
1432 !bdrv_is_removable(bs) &&
1433 !bdrv_is_read_only(bs));
1436 static BlockDriverState *get_bs_snapshots(void)
1438 BlockDriverState *bs;
1442 return bs_snapshots;
1443 TAILQ_FOREACH(dinfo, &drives, next) {
1445 if (bdrv_can_snapshot(bs))
1454 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1457 QEMUSnapshotInfo *sn_tab, *sn;
1461 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1464 for(i = 0; i < nb_sns; i++) {
1466 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1476 void do_savevm(Monitor *mon, const QDict *qdict)
1479 BlockDriverState *bs, *bs1;
1480 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1481 int must_delete, ret;
1483 int saved_vm_running;
1484 uint32_t vm_state_size;
1490 const char *name = qdict_get_try_str(qdict, "name");
1492 bs = get_bs_snapshots();
1494 monitor_printf(mon, "No block device can accept snapshots\n");
1498 /* ??? Should this occur after vm_stop? */
1501 saved_vm_running = vm_running;
1506 ret = bdrv_snapshot_find(bs, old_sn, name);
1511 memset(sn, 0, sizeof(*sn));
1513 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1514 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1517 pstrcpy(sn->name, sizeof(sn->name), name);
1520 /* fill auxiliary fields */
1523 sn->date_sec = tb.time;
1524 sn->date_nsec = tb.millitm * 1000000;
1526 gettimeofday(&tv, NULL);
1527 sn->date_sec = tv.tv_sec;
1528 sn->date_nsec = tv.tv_usec * 1000;
1530 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1532 /* save the VM state */
1533 f = qemu_fopen_bdrv(bs, 1);
1535 monitor_printf(mon, "Could not open VM state file\n");
1538 ret = qemu_savevm_state(f);
1539 vm_state_size = qemu_ftell(f);
1542 monitor_printf(mon, "Error %d while writing VM\n", ret);
1546 /* create the snapshots */
1548 TAILQ_FOREACH(dinfo, &drives, next) {
1550 if (bdrv_has_snapshot(bs1)) {
1552 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1555 "Error while deleting snapshot on '%s'\n",
1556 bdrv_get_device_name(bs1));
1559 /* Write VM state size only to the image that contains the state */
1560 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1561 ret = bdrv_snapshot_create(bs1, sn);
1563 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1564 bdrv_get_device_name(bs1));
1570 if (saved_vm_running)
1574 int load_vmstate(Monitor *mon, const char *name)
1577 BlockDriverState *bs, *bs1;
1578 QEMUSnapshotInfo sn;
1582 bs = get_bs_snapshots();
1584 monitor_printf(mon, "No block device supports snapshots\n");
1588 /* Flush all IO requests so they don't interfere with the new state. */
1591 TAILQ_FOREACH(dinfo, &drives, next) {
1593 if (bdrv_has_snapshot(bs1)) {
1594 ret = bdrv_snapshot_goto(bs1, name);
1597 monitor_printf(mon, "Warning: ");
1601 "Snapshots not supported on device '%s'\n",
1602 bdrv_get_device_name(bs1));
1605 monitor_printf(mon, "Could not find snapshot '%s' on "
1607 name, bdrv_get_device_name(bs1));
1610 monitor_printf(mon, "Error %d while activating snapshot on"
1611 " '%s'\n", ret, bdrv_get_device_name(bs1));
1614 /* fatal on snapshot block device */
1621 /* Don't even try to load empty VM states */
1622 ret = bdrv_snapshot_find(bs, &sn, name);
1623 if ((ret >= 0) && (sn.vm_state_size == 0))
1626 /* restore the VM state */
1627 f = qemu_fopen_bdrv(bs, 0);
1629 monitor_printf(mon, "Could not open VM state file\n");
1632 ret = qemu_loadvm_state(f);
1635 monitor_printf(mon, "Error %d while loading VM state\n", ret);
1641 void do_delvm(Monitor *mon, const QDict *qdict)
1644 BlockDriverState *bs, *bs1;
1646 const char *name = qdict_get_str(qdict, "name");
1648 bs = get_bs_snapshots();
1650 monitor_printf(mon, "No block device supports snapshots\n");
1654 TAILQ_FOREACH(dinfo, &drives, next) {
1656 if (bdrv_has_snapshot(bs1)) {
1657 ret = bdrv_snapshot_delete(bs1, name);
1659 if (ret == -ENOTSUP)
1661 "Snapshots not supported on device '%s'\n",
1662 bdrv_get_device_name(bs1));
1664 monitor_printf(mon, "Error %d while deleting snapshot on "
1665 "'%s'\n", ret, bdrv_get_device_name(bs1));
1671 void do_info_snapshots(Monitor *mon)
1674 BlockDriverState *bs, *bs1;
1675 QEMUSnapshotInfo *sn_tab, *sn;
1679 bs = get_bs_snapshots();
1681 monitor_printf(mon, "No available block device supports snapshots\n");
1684 monitor_printf(mon, "Snapshot devices:");
1685 TAILQ_FOREACH(dinfo, &drives, next) {
1687 if (bdrv_has_snapshot(bs1)) {
1689 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1692 monitor_printf(mon, "\n");
1694 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1696 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1699 monitor_printf(mon, "Snapshot list (from %s):\n",
1700 bdrv_get_device_name(bs));
1701 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1702 for(i = 0; i < nb_sns; i++) {
1704 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));