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 #include <arpa/inet.h>
48 #include <sys/select.h>
51 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
59 #include <linux/rtc.h>
67 #include <sys/timeb.h>
69 #define getopt_long_only getopt_long
70 #define memalign(align, size) malloc(size)
73 #include "qemu-common.h"
79 #include "qemu-timer.h"
80 #include "qemu-char.h"
82 #include "audio/audio.h"
83 #include "migration.h"
84 #include "qemu_socket.h"
85 #include "qemu-queue.h"
87 #define SELF_ANNOUNCE_ROUNDS 5
90 #define ETH_P_RARP 0x8035
92 #define ARP_HTYPE_ETH 0x0001
93 #define ARP_PTYPE_IP 0x0800
94 #define ARP_OP_REQUEST_REV 0x3
96 static int announce_self_create(uint8_t *buf,
99 /* Ethernet header. */
100 memset(buf, 0xff, 6); /* destination MAC addr */
101 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
102 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
105 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
106 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
107 *(buf + 18) = 6; /* hardware addr length (ethernet) */
108 *(buf + 19) = 4; /* protocol addr length (IPv4) */
109 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
110 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
111 memset(buf + 28, 0x00, 4); /* source protocol addr */
112 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
113 memset(buf + 38, 0x00, 4); /* target protocol addr */
115 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
116 memset(buf + 42, 0x00, 18);
118 return 60; /* len (FCS will be added by hardware) */
121 static void qemu_announce_self_iter(NICState *nic, void *opaque)
126 len = announce_self_create(buf, nic->conf->macaddr.a);
128 qemu_send_packet_raw(&nic->nc, buf, len);
132 static void qemu_announce_self_once(void *opaque)
134 static int count = SELF_ANNOUNCE_ROUNDS;
135 QEMUTimer *timer = *(QEMUTimer **)opaque;
137 qemu_foreach_nic(qemu_announce_self_iter, NULL);
140 /* delay 50ms, 150ms, 250ms, ... */
141 qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
142 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
144 qemu_del_timer(timer);
145 qemu_free_timer(timer);
149 void qemu_announce_self(void)
151 static QEMUTimer *timer;
152 timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
153 qemu_announce_self_once(&timer);
156 /***********************************************************/
157 /* savevm/loadvm support */
159 #define IO_BUF_SIZE 32768
162 QEMUFilePutBufferFunc *put_buffer;
163 QEMUFileGetBufferFunc *get_buffer;
164 QEMUFileCloseFunc *close;
165 QEMUFileRateLimit *rate_limit;
166 QEMUFileSetRateLimit *set_rate_limit;
167 QEMUFileGetRateLimit *get_rate_limit;
171 int64_t buf_offset; /* start of buffer when writing, end of buffer
174 int buf_size; /* 0 when writing */
175 uint8_t buf[IO_BUF_SIZE];
180 typedef struct QEMUFileStdio
186 typedef struct QEMUFileSocket
192 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
194 QEMUFileSocket *s = opaque;
198 len = recv(s->fd, (void *)buf, size, 0);
199 } while (len == -1 && socket_error() == EINTR);
202 len = -socket_error();
207 static int socket_close(void *opaque)
209 QEMUFileSocket *s = opaque;
214 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
216 QEMUFileStdio *s = opaque;
217 return fwrite(buf, 1, size, s->stdio_file);
220 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
222 QEMUFileStdio *s = opaque;
223 FILE *fp = s->stdio_file;
228 bytes = fread(buf, 1, size, fp);
229 } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
233 static int stdio_pclose(void *opaque)
235 QEMUFileStdio *s = opaque;
237 ret = pclose(s->stdio_file);
242 static int stdio_fclose(void *opaque)
244 QEMUFileStdio *s = opaque;
245 fclose(s->stdio_file);
250 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
254 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
255 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
259 s = qemu_mallocz(sizeof(QEMUFileStdio));
261 s->stdio_file = stdio_file;
264 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
267 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
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 int qemu_stdio_fd(QEMUFile *f)
290 p = (QEMUFileStdio *)f->opaque;
291 fd = fileno(p->stdio_file);
296 QEMUFile *qemu_fdopen(int fd, const char *mode)
301 (mode[0] != 'r' && mode[0] != 'w') ||
302 mode[1] != 'b' || mode[2] != 0) {
303 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
307 s = qemu_mallocz(sizeof(QEMUFileStdio));
308 s->stdio_file = fdopen(fd, mode);
313 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
316 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
326 QEMUFile *qemu_fopen_socket(int fd)
328 QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
331 s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
336 static int file_put_buffer(void *opaque, const uint8_t *buf,
337 int64_t pos, int size)
339 QEMUFileStdio *s = opaque;
340 fseek(s->stdio_file, pos, SEEK_SET);
341 return fwrite(buf, 1, size, s->stdio_file);
344 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
346 QEMUFileStdio *s = opaque;
347 fseek(s->stdio_file, pos, SEEK_SET);
348 return fread(buf, 1, size, s->stdio_file);
351 QEMUFile *qemu_fopen(const char *filename, const char *mode)
356 (mode[0] != 'r' && mode[0] != 'w') ||
357 mode[1] != 'b' || mode[2] != 0) {
358 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
362 s = qemu_mallocz(sizeof(QEMUFileStdio));
364 s->stdio_file = fopen(filename, mode);
369 s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
372 s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
381 static int block_put_buffer(void *opaque, const uint8_t *buf,
382 int64_t pos, int size)
384 bdrv_save_vmstate(opaque, buf, pos, size);
388 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
390 return bdrv_load_vmstate(opaque, buf, pos, size);
393 static int bdrv_fclose(void *opaque)
398 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
401 return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
403 return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
406 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
407 QEMUFileGetBufferFunc *get_buffer,
408 QEMUFileCloseFunc *close,
409 QEMUFileRateLimit *rate_limit,
410 QEMUFileSetRateLimit *set_rate_limit,
411 QEMUFileGetRateLimit *get_rate_limit)
415 f = qemu_mallocz(sizeof(QEMUFile));
418 f->put_buffer = put_buffer;
419 f->get_buffer = get_buffer;
421 f->rate_limit = rate_limit;
422 f->set_rate_limit = set_rate_limit;
423 f->get_rate_limit = get_rate_limit;
429 int qemu_file_has_error(QEMUFile *f)
434 void qemu_file_set_error(QEMUFile *f)
439 void qemu_fflush(QEMUFile *f)
444 if (f->is_write && f->buf_index > 0) {
447 len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
449 f->buf_offset += f->buf_index;
456 static void qemu_fill_buffer(QEMUFile *f)
466 len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
470 f->buf_offset += len;
471 } else if (len != -EAGAIN)
475 int qemu_fclose(QEMUFile *f)
480 ret = f->close(f->opaque);
485 void qemu_file_put_notify(QEMUFile *f)
487 f->put_buffer(f->opaque, NULL, 0, 0);
490 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
494 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
496 "Attempted to write to buffer while read buffer is not empty\n");
500 while (!f->has_error && size > 0) {
501 l = IO_BUF_SIZE - f->buf_index;
504 memcpy(f->buf + f->buf_index, buf, l);
509 if (f->buf_index >= IO_BUF_SIZE)
514 void qemu_put_byte(QEMUFile *f, int v)
516 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
518 "Attempted to write to buffer while read buffer is not empty\n");
522 f->buf[f->buf_index++] = v;
524 if (f->buf_index >= IO_BUF_SIZE)
528 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
537 l = f->buf_size - f->buf_index;
540 l = f->buf_size - f->buf_index;
546 memcpy(buf, f->buf + f->buf_index, l);
554 static int qemu_peek_byte(QEMUFile *f)
559 if (f->buf_index >= f->buf_size) {
561 if (f->buf_index >= f->buf_size)
564 return f->buf[f->buf_index];
567 int qemu_get_byte(QEMUFile *f)
572 if (f->buf_index >= f->buf_size) {
574 if (f->buf_index >= f->buf_size)
577 return f->buf[f->buf_index++];
580 int64_t qemu_ftell(QEMUFile *f)
582 return f->buf_offset - f->buf_size + f->buf_index;
585 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
587 if (whence == SEEK_SET) {
589 } else if (whence == SEEK_CUR) {
590 pos += qemu_ftell(f);
592 /* SEEK_END not supported */
606 int qemu_file_rate_limit(QEMUFile *f)
609 return f->rate_limit(f->opaque);
614 size_t qemu_file_get_rate_limit(QEMUFile *f)
616 if (f->get_rate_limit)
617 return f->get_rate_limit(f->opaque);
622 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
624 /* any failed or completed migration keeps its state to allow probing of
625 * migration data, but has no associated file anymore */
626 if (f && f->set_rate_limit)
627 return f->set_rate_limit(f->opaque, new_rate);
632 void qemu_put_be16(QEMUFile *f, unsigned int v)
634 qemu_put_byte(f, v >> 8);
638 void qemu_put_be32(QEMUFile *f, unsigned int v)
640 qemu_put_byte(f, v >> 24);
641 qemu_put_byte(f, v >> 16);
642 qemu_put_byte(f, v >> 8);
646 void qemu_put_be64(QEMUFile *f, uint64_t v)
648 qemu_put_be32(f, v >> 32);
652 unsigned int qemu_get_be16(QEMUFile *f)
655 v = qemu_get_byte(f) << 8;
656 v |= qemu_get_byte(f);
660 unsigned int qemu_get_be32(QEMUFile *f)
663 v = qemu_get_byte(f) << 24;
664 v |= qemu_get_byte(f) << 16;
665 v |= qemu_get_byte(f) << 8;
666 v |= qemu_get_byte(f);
670 uint64_t qemu_get_be64(QEMUFile *f)
673 v = (uint64_t)qemu_get_be32(f) << 32;
674 v |= qemu_get_be32(f);
680 static int get_int8(QEMUFile *f, void *pv, size_t size)
687 static void put_int8(QEMUFile *f, void *pv, size_t size)
693 const VMStateInfo vmstate_info_int8 = {
701 static int get_int16(QEMUFile *f, void *pv, size_t size)
704 qemu_get_sbe16s(f, v);
708 static void put_int16(QEMUFile *f, void *pv, size_t size)
711 qemu_put_sbe16s(f, v);
714 const VMStateInfo vmstate_info_int16 = {
722 static int get_int32(QEMUFile *f, void *pv, size_t size)
725 qemu_get_sbe32s(f, v);
729 static void put_int32(QEMUFile *f, void *pv, size_t size)
732 qemu_put_sbe32s(f, v);
735 const VMStateInfo vmstate_info_int32 = {
741 /* 32 bit int. See that the received value is the same than the one
744 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
748 qemu_get_sbe32s(f, &v2);
755 const VMStateInfo vmstate_info_int32_equal = {
756 .name = "int32 equal",
757 .get = get_int32_equal,
761 /* 32 bit int. See that the received value is the less or the same
762 than the one in the field */
764 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
768 qemu_get_sbe32s(f, &new);
775 const VMStateInfo vmstate_info_int32_le = {
776 .name = "int32 equal",
783 static int get_int64(QEMUFile *f, void *pv, size_t size)
786 qemu_get_sbe64s(f, v);
790 static void put_int64(QEMUFile *f, void *pv, size_t size)
793 qemu_put_sbe64s(f, v);
796 const VMStateInfo vmstate_info_int64 = {
802 /* 8 bit unsigned int */
804 static int get_uint8(QEMUFile *f, void *pv, size_t size)
811 static void put_uint8(QEMUFile *f, void *pv, size_t size)
817 const VMStateInfo vmstate_info_uint8 = {
823 /* 16 bit unsigned int */
825 static int get_uint16(QEMUFile *f, void *pv, size_t size)
828 qemu_get_be16s(f, v);
832 static void put_uint16(QEMUFile *f, void *pv, size_t size)
835 qemu_put_be16s(f, v);
838 const VMStateInfo vmstate_info_uint16 = {
844 /* 32 bit unsigned int */
846 static int get_uint32(QEMUFile *f, void *pv, size_t size)
849 qemu_get_be32s(f, v);
853 static void put_uint32(QEMUFile *f, void *pv, size_t size)
856 qemu_put_be32s(f, v);
859 const VMStateInfo vmstate_info_uint32 = {
865 /* 64 bit unsigned int */
867 static int get_uint64(QEMUFile *f, void *pv, size_t size)
870 qemu_get_be64s(f, v);
874 static void put_uint64(QEMUFile *f, void *pv, size_t size)
877 qemu_put_be64s(f, v);
880 const VMStateInfo vmstate_info_uint64 = {
886 /* 8 bit int. See that the received value is the same than the one
889 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
900 const VMStateInfo vmstate_info_uint8_equal = {
901 .name = "uint8 equal",
902 .get = get_uint8_equal,
906 /* 16 bit unsigned int int. See that the received value is the same than the one
909 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
913 qemu_get_be16s(f, &v2);
920 const VMStateInfo vmstate_info_uint16_equal = {
921 .name = "uint16 equal",
922 .get = get_uint16_equal,
928 static int get_timer(QEMUFile *f, void *pv, size_t size)
931 qemu_get_timer(f, v);
935 static void put_timer(QEMUFile *f, void *pv, size_t size)
938 qemu_put_timer(f, v);
941 const VMStateInfo vmstate_info_timer = {
947 /* uint8_t buffers */
949 static int get_buffer(QEMUFile *f, void *pv, size_t size)
952 qemu_get_buffer(f, v, size);
956 static void put_buffer(QEMUFile *f, void *pv, size_t size)
959 qemu_put_buffer(f, v, size);
962 const VMStateInfo vmstate_info_buffer = {
968 /* unused buffers: space that was used for some fields that are
969 not usefull anymore */
971 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
977 block_len = MIN(sizeof(buf), size);
979 qemu_get_buffer(f, buf, block_len);
984 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
986 static const uint8_t buf[1024];
990 block_len = MIN(sizeof(buf), size);
992 qemu_put_buffer(f, buf, block_len);
996 const VMStateInfo vmstate_info_unused_buffer = {
997 .name = "unused_buffer",
998 .get = get_unused_buffer,
999 .put = put_unused_buffer,
1002 typedef struct CompatEntry {
1007 typedef struct SaveStateEntry {
1008 QTAILQ_ENTRY(SaveStateEntry) entry;
1014 SaveSetParamsHandler *set_params;
1015 SaveLiveStateHandler *save_live_state;
1016 SaveStateHandler *save_state;
1017 LoadStateHandler *load_state;
1018 const VMStateDescription *vmsd;
1020 CompatEntry *compat;
1025 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1026 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1027 static int global_section_id;
1029 static int calculate_new_instance_id(const char *idstr)
1032 int instance_id = 0;
1034 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1035 if (strcmp(idstr, se->idstr) == 0
1036 && instance_id <= se->instance_id) {
1037 instance_id = se->instance_id + 1;
1043 static int calculate_compat_instance_id(const char *idstr)
1046 int instance_id = 0;
1048 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1052 if (strcmp(idstr, se->compat->idstr) == 0
1053 && instance_id <= se->compat->instance_id) {
1054 instance_id = se->compat->instance_id + 1;
1060 /* TODO: Individual devices generally have very little idea about the rest
1061 of the system, so instance_id should be removed/replaced.
1062 Meanwhile pass -1 as instance_id if you do not already have a clearly
1063 distinguishing id for all instances of your device class. */
1064 int register_savevm_live(DeviceState *dev,
1068 SaveSetParamsHandler *set_params,
1069 SaveLiveStateHandler *save_live_state,
1070 SaveStateHandler *save_state,
1071 LoadStateHandler *load_state,
1076 se = qemu_mallocz(sizeof(SaveStateEntry));
1077 se->version_id = version_id;
1078 se->section_id = global_section_id++;
1079 se->set_params = set_params;
1080 se->save_live_state = save_live_state;
1081 se->save_state = save_state;
1082 se->load_state = load_state;
1083 se->opaque = opaque;
1087 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1088 char *id = dev->parent_bus->info->get_dev_path(dev);
1090 pstrcpy(se->idstr, sizeof(se->idstr), id);
1091 pstrcat(se->idstr, sizeof(se->idstr), "/");
1094 se->compat = qemu_mallocz(sizeof(CompatEntry));
1095 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1096 se->compat->instance_id = instance_id == -1 ?
1097 calculate_compat_instance_id(idstr) : instance_id;
1101 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1103 if (instance_id == -1) {
1104 se->instance_id = calculate_new_instance_id(se->idstr);
1106 se->instance_id = instance_id;
1108 assert(!se->compat || se->instance_id == 0);
1109 /* add at the end of list */
1110 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1114 int register_savevm(DeviceState *dev,
1118 SaveStateHandler *save_state,
1119 LoadStateHandler *load_state,
1122 return register_savevm_live(dev, idstr, instance_id, version_id,
1123 NULL, NULL, save_state, load_state, opaque);
1126 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1128 SaveStateEntry *se, *new_se;
1131 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1132 char *path = dev->parent_bus->info->get_dev_path(dev);
1134 pstrcpy(id, sizeof(id), path);
1135 pstrcat(id, sizeof(id), "/");
1139 pstrcat(id, sizeof(id), idstr);
1141 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1142 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1143 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1145 qemu_free(se->compat);
1152 /* mark a device as not to be migrated, that is the device should be
1153 unplugged before migration */
1154 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1160 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1161 char *path = dev->parent_bus->info->get_dev_path(dev);
1163 pstrcpy(id, sizeof(id), path);
1164 pstrcat(id, sizeof(id), "/");
1168 pstrcat(id, sizeof(id), idstr);
1170 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1171 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1177 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1178 const VMStateDescription *vmsd,
1179 void *opaque, int alias_id,
1180 int required_for_version)
1184 /* If this triggers, alias support can be dropped for the vmsd. */
1185 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1187 se = qemu_mallocz(sizeof(SaveStateEntry));
1188 se->version_id = vmsd->version_id;
1189 se->section_id = global_section_id++;
1190 se->save_live_state = NULL;
1191 se->save_state = NULL;
1192 se->load_state = NULL;
1193 se->opaque = opaque;
1195 se->alias_id = alias_id;
1197 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1198 char *id = dev->parent_bus->info->get_dev_path(dev);
1200 pstrcpy(se->idstr, sizeof(se->idstr), id);
1201 pstrcat(se->idstr, sizeof(se->idstr), "/");
1204 se->compat = qemu_mallocz(sizeof(CompatEntry));
1205 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1206 se->compat->instance_id = instance_id == -1 ?
1207 calculate_compat_instance_id(vmsd->name) : instance_id;
1211 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1213 if (instance_id == -1) {
1214 se->instance_id = calculate_new_instance_id(se->idstr);
1216 se->instance_id = instance_id;
1218 assert(!se->compat || se->instance_id == 0);
1219 /* add at the end of list */
1220 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1224 int vmstate_register(DeviceState *dev, int instance_id,
1225 const VMStateDescription *vmsd, void *opaque)
1227 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1231 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1234 SaveStateEntry *se, *new_se;
1236 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1237 if (se->vmsd == vmsd && se->opaque == opaque) {
1238 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1240 qemu_free(se->compat);
1247 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1249 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1252 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1253 void *opaque, int version_id)
1255 VMStateField *field = vmsd->fields;
1258 if (version_id > vmsd->version_id) {
1261 if (version_id < vmsd->minimum_version_id_old) {
1264 if (version_id < vmsd->minimum_version_id) {
1265 return vmsd->load_state_old(f, opaque, version_id);
1267 if (vmsd->pre_load) {
1268 int ret = vmsd->pre_load(opaque);
1272 while(field->name) {
1273 if ((field->field_exists &&
1274 field->field_exists(opaque, version_id)) ||
1275 (!field->field_exists &&
1276 field->version_id <= version_id)) {
1277 void *base_addr = opaque + field->offset;
1279 int size = field->size;
1281 if (field->flags & VMS_VBUFFER) {
1282 size = *(int32_t *)(opaque+field->size_offset);
1283 if (field->flags & VMS_MULTIPLY) {
1284 size *= field->size;
1287 if (field->flags & VMS_ARRAY) {
1288 n_elems = field->num;
1289 } else if (field->flags & VMS_VARRAY_INT32) {
1290 n_elems = *(int32_t *)(opaque+field->num_offset);
1291 } else if (field->flags & VMS_VARRAY_UINT16) {
1292 n_elems = *(uint16_t *)(opaque+field->num_offset);
1294 if (field->flags & VMS_POINTER) {
1295 base_addr = *(void **)base_addr + field->start;
1297 for (i = 0; i < n_elems; i++) {
1298 void *addr = base_addr + size * i;
1300 if (field->flags & VMS_ARRAY_OF_POINTER) {
1301 addr = *(void **)addr;
1303 if (field->flags & VMS_STRUCT) {
1304 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1306 ret = field->info->get(f, addr, size);
1316 ret = vmstate_subsection_load(f, vmsd, opaque);
1320 if (vmsd->post_load) {
1321 return vmsd->post_load(opaque, version_id);
1326 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1329 VMStateField *field = vmsd->fields;
1331 if (vmsd->pre_save) {
1332 vmsd->pre_save(opaque);
1334 while(field->name) {
1335 if (!field->field_exists ||
1336 field->field_exists(opaque, vmsd->version_id)) {
1337 void *base_addr = opaque + field->offset;
1339 int size = field->size;
1341 if (field->flags & VMS_VBUFFER) {
1342 size = *(int32_t *)(opaque+field->size_offset);
1343 if (field->flags & VMS_MULTIPLY) {
1344 size *= field->size;
1347 if (field->flags & VMS_ARRAY) {
1348 n_elems = field->num;
1349 } else if (field->flags & VMS_VARRAY_INT32) {
1350 n_elems = *(int32_t *)(opaque+field->num_offset);
1351 } else if (field->flags & VMS_VARRAY_UINT16) {
1352 n_elems = *(uint16_t *)(opaque+field->num_offset);
1354 if (field->flags & VMS_POINTER) {
1355 base_addr = *(void **)base_addr + field->start;
1357 for (i = 0; i < n_elems; i++) {
1358 void *addr = base_addr + size * i;
1360 if (field->flags & VMS_ARRAY_OF_POINTER) {
1361 addr = *(void **)addr;
1363 if (field->flags & VMS_STRUCT) {
1364 vmstate_save_state(f, field->vmsd, addr);
1366 field->info->put(f, addr, size);
1372 vmstate_subsection_save(f, vmsd, opaque);
1375 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1377 if (!se->vmsd) { /* Old style */
1378 return se->load_state(f, se->opaque, version_id);
1380 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1383 static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
1385 if (se->no_migrate) {
1389 if (!se->vmsd) { /* Old style */
1390 se->save_state(f, se->opaque);
1393 vmstate_save_state(f,se->vmsd, se->opaque);
1398 #define QEMU_VM_FILE_MAGIC 0x5145564d
1399 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1400 #define QEMU_VM_FILE_VERSION 0x00000003
1402 #define QEMU_VM_EOF 0x00
1403 #define QEMU_VM_SECTION_START 0x01
1404 #define QEMU_VM_SECTION_PART 0x02
1405 #define QEMU_VM_SECTION_END 0x03
1406 #define QEMU_VM_SECTION_FULL 0x04
1407 #define QEMU_VM_SUBSECTION 0x05
1409 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1414 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1415 if(se->set_params == NULL) {
1418 se->set_params(blk_enable, shared, se->opaque);
1421 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1422 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1424 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1427 if (se->save_live_state == NULL)
1431 qemu_put_byte(f, QEMU_VM_SECTION_START);
1432 qemu_put_be32(f, se->section_id);
1435 len = strlen(se->idstr);
1436 qemu_put_byte(f, len);
1437 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1439 qemu_put_be32(f, se->instance_id);
1440 qemu_put_be32(f, se->version_id);
1442 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1445 if (qemu_file_has_error(f)) {
1446 qemu_savevm_state_cancel(mon, f);
1453 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1458 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1459 if (se->save_live_state == NULL)
1463 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1464 qemu_put_be32(f, se->section_id);
1466 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1468 /* Do not proceed to the next vmstate before this one reported
1469 completion of the current stage. This serializes the migration
1470 and reduces the probability that a faster changing state is
1471 synchronized over and over again. */
1479 if (qemu_file_has_error(f)) {
1480 qemu_savevm_state_cancel(mon, f);
1487 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1492 cpu_synchronize_all_states();
1494 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1495 if (se->save_live_state == NULL)
1499 qemu_put_byte(f, QEMU_VM_SECTION_END);
1500 qemu_put_be32(f, se->section_id);
1502 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1505 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1508 if (se->save_state == NULL && se->vmsd == NULL)
1512 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1513 qemu_put_be32(f, se->section_id);
1516 len = strlen(se->idstr);
1517 qemu_put_byte(f, len);
1518 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1520 qemu_put_be32(f, se->instance_id);
1521 qemu_put_be32(f, se->version_id);
1523 r = vmstate_save(f, se);
1525 monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
1530 qemu_put_byte(f, QEMU_VM_EOF);
1532 if (qemu_file_has_error(f))
1538 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1542 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1543 if (se->save_live_state) {
1544 se->save_live_state(mon, f, -1, se->opaque);
1549 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1551 int saved_vm_running;
1554 saved_vm_running = vm_running;
1559 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1564 ret = qemu_savevm_state_iterate(mon, f);
1569 ret = qemu_savevm_state_complete(mon, f);
1572 if (qemu_file_has_error(f))
1575 if (!ret && saved_vm_running)
1581 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1585 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1586 if (!strcmp(se->idstr, idstr) &&
1587 (instance_id == se->instance_id ||
1588 instance_id == se->alias_id))
1590 /* Migrating from an older version? */
1591 if (strstr(se->idstr, idstr) && se->compat) {
1592 if (!strcmp(se->compat->idstr, idstr) &&
1593 (instance_id == se->compat->instance_id ||
1594 instance_id == se->alias_id))
1601 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1603 while(sub && sub->needed) {
1604 if (strcmp(idstr, sub->vmsd->name) == 0) {
1612 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1615 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1618 uint8_t version_id, subsection, len;
1619 const VMStateDescription *sub_vmsd;
1621 subsection = qemu_get_byte(f);
1622 len = qemu_get_byte(f);
1623 qemu_get_buffer(f, (uint8_t *)idstr, len);
1625 version_id = qemu_get_be32(f);
1627 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1628 if (sub_vmsd == NULL) {
1631 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1639 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1642 const VMStateSubsection *sub = vmsd->subsections;
1644 while (sub && sub->needed) {
1645 if (sub->needed(opaque)) {
1646 const VMStateDescription *vmsd = sub->vmsd;
1649 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1650 len = strlen(vmsd->name);
1651 qemu_put_byte(f, len);
1652 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1653 qemu_put_be32(f, vmsd->version_id);
1654 vmstate_save_state(f, vmsd, opaque);
1660 typedef struct LoadStateEntry {
1661 QLIST_ENTRY(LoadStateEntry) entry;
1667 int qemu_loadvm_state(QEMUFile *f)
1669 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1670 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1671 LoadStateEntry *le, *new_le;
1672 uint8_t section_type;
1676 v = qemu_get_be32(f);
1677 if (v != QEMU_VM_FILE_MAGIC)
1680 v = qemu_get_be32(f);
1681 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1682 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1685 if (v != QEMU_VM_FILE_VERSION)
1688 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1689 uint32_t instance_id, version_id, section_id;
1694 switch (section_type) {
1695 case QEMU_VM_SECTION_START:
1696 case QEMU_VM_SECTION_FULL:
1697 /* Read section start */
1698 section_id = qemu_get_be32(f);
1699 len = qemu_get_byte(f);
1700 qemu_get_buffer(f, (uint8_t *)idstr, len);
1702 instance_id = qemu_get_be32(f);
1703 version_id = qemu_get_be32(f);
1705 /* Find savevm section */
1706 se = find_se(idstr, instance_id);
1708 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1713 /* Validate version */
1714 if (version_id > se->version_id) {
1715 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1716 version_id, idstr, se->version_id);
1722 le = qemu_mallocz(sizeof(*le));
1725 le->section_id = section_id;
1726 le->version_id = version_id;
1727 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1729 ret = vmstate_load(f, le->se, le->version_id);
1731 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1732 instance_id, idstr);
1736 case QEMU_VM_SECTION_PART:
1737 case QEMU_VM_SECTION_END:
1738 section_id = qemu_get_be32(f);
1740 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1741 if (le->section_id == section_id) {
1746 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1751 ret = vmstate_load(f, le->se, le->version_id);
1753 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1759 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1765 cpu_synchronize_all_post_init();
1770 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1771 QLIST_REMOVE(le, entry);
1775 if (qemu_file_has_error(f))
1781 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1784 QEMUSnapshotInfo *sn_tab, *sn;
1788 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1791 for(i = 0; i < nb_sns; i++) {
1793 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1804 * Deletes snapshots of a given name in all opened images.
1806 static int del_existing_snapshots(Monitor *mon, const char *name)
1808 BlockDriverState *bs;
1809 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1813 while ((bs = bdrv_next(bs))) {
1814 if (bdrv_can_snapshot(bs) &&
1815 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1817 ret = bdrv_snapshot_delete(bs, name);
1820 "Error while deleting snapshot on '%s'\n",
1821 bdrv_get_device_name(bs));
1830 void do_savevm(Monitor *mon, const QDict *qdict)
1832 BlockDriverState *bs, *bs1;
1833 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1836 int saved_vm_running;
1837 uint32_t vm_state_size;
1845 const char *name = qdict_get_try_str(qdict, "name");
1847 /* Verify if there is a device that doesn't support snapshots and is writable */
1849 while ((bs = bdrv_next(bs))) {
1851 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1855 if (!bdrv_can_snapshot(bs)) {
1856 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1857 bdrv_get_device_name(bs));
1862 bs = bdrv_snapshots();
1864 monitor_printf(mon, "No block device can accept snapshots\n");
1867 /* ??? Should this occur after vm_stop? */
1870 saved_vm_running = vm_running;
1873 memset(sn, 0, sizeof(*sn));
1875 /* fill auxiliary fields */
1878 sn->date_sec = tb.time;
1879 sn->date_nsec = tb.millitm * 1000000;
1881 gettimeofday(&tv, NULL);
1882 sn->date_sec = tv.tv_sec;
1883 sn->date_nsec = tv.tv_usec * 1000;
1885 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1888 ret = bdrv_snapshot_find(bs, old_sn, name);
1890 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1891 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1893 pstrcpy(sn->name, sizeof(sn->name), name);
1897 ptm = localtime(&tb.time);
1898 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1900 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1901 localtime_r((const time_t *)&tv.tv_sec, &tm);
1902 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1906 /* Delete old snapshots of the same name */
1907 if (name && del_existing_snapshots(mon, name) < 0) {
1911 /* save the VM state */
1912 f = qemu_fopen_bdrv(bs, 1);
1914 monitor_printf(mon, "Could not open VM state file\n");
1917 ret = qemu_savevm_state(mon, f);
1918 vm_state_size = qemu_ftell(f);
1921 monitor_printf(mon, "Error %d while writing VM\n", ret);
1925 /* create the snapshots */
1928 while ((bs1 = bdrv_next(bs1))) {
1929 if (bdrv_can_snapshot(bs1)) {
1930 /* Write VM state size only to the image that contains the state */
1931 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1932 ret = bdrv_snapshot_create(bs1, sn);
1934 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1935 bdrv_get_device_name(bs1));
1941 if (saved_vm_running)
1945 int load_vmstate(const char *name)
1947 BlockDriverState *bs, *bs_vm_state;
1948 QEMUSnapshotInfo sn;
1952 bs_vm_state = bdrv_snapshots();
1954 error_report("No block device supports snapshots");
1958 /* Don't even try to load empty VM states */
1959 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1962 } else if (sn.vm_state_size == 0) {
1966 /* Verify if there is any device that doesn't support snapshots and is
1967 writable and check if the requested snapshot is available too. */
1969 while ((bs = bdrv_next(bs))) {
1971 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1975 if (!bdrv_can_snapshot(bs)) {
1976 error_report("Device '%s' is writable but does not support snapshots.",
1977 bdrv_get_device_name(bs));
1981 ret = bdrv_snapshot_find(bs, &sn, name);
1983 error_report("Device '%s' does not have the requested snapshot '%s'",
1984 bdrv_get_device_name(bs), name);
1989 /* Flush all IO requests so they don't interfere with the new state. */
1993 while ((bs = bdrv_next(bs))) {
1994 if (bdrv_can_snapshot(bs)) {
1995 ret = bdrv_snapshot_goto(bs, name);
1997 error_report("Error %d while activating snapshot '%s' on '%s'",
1998 ret, name, bdrv_get_device_name(bs));
2004 /* restore the VM state */
2005 f = qemu_fopen_bdrv(bs_vm_state, 0);
2007 error_report("Could not open VM state file");
2011 ret = qemu_loadvm_state(f);
2015 error_report("Error %d while loading VM state", ret);
2022 void do_delvm(Monitor *mon, const QDict *qdict)
2024 BlockDriverState *bs, *bs1;
2026 const char *name = qdict_get_str(qdict, "name");
2028 bs = bdrv_snapshots();
2030 monitor_printf(mon, "No block device supports snapshots\n");
2035 while ((bs1 = bdrv_next(bs1))) {
2036 if (bdrv_can_snapshot(bs1)) {
2037 ret = bdrv_snapshot_delete(bs1, name);
2039 if (ret == -ENOTSUP)
2041 "Snapshots not supported on device '%s'\n",
2042 bdrv_get_device_name(bs1));
2044 monitor_printf(mon, "Error %d while deleting snapshot on "
2045 "'%s'\n", ret, bdrv_get_device_name(bs1));
2051 void do_info_snapshots(Monitor *mon)
2053 BlockDriverState *bs, *bs1;
2054 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2055 int nb_sns, i, ret, available;
2057 int *available_snapshots;
2060 bs = bdrv_snapshots();
2062 monitor_printf(mon, "No available block device supports snapshots\n");
2066 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2068 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2073 monitor_printf(mon, "There is no snapshot available.\n");
2077 available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2079 for (i = 0; i < nb_sns; i++) {
2084 while ((bs1 = bdrv_next(bs1))) {
2085 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2086 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2095 available_snapshots[total] = i;
2101 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2102 for (i = 0; i < total; i++) {
2103 sn = &sn_tab[available_snapshots[i]];
2104 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2107 monitor_printf(mon, "There is no suitable snapshot available\n");
2111 qemu_free(available_snapshots);