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 int64_t qemu_file_get_rate_limit(QEMUFile *f)
616 if (f->get_rate_limit)
617 return f->get_rate_limit(f->opaque);
622 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_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_bool(QEMUFile *f, void *pv, size_t size)
683 *v = qemu_get_byte(f);
687 static void put_bool(QEMUFile *f, void *pv, size_t size)
690 qemu_put_byte(f, *v);
693 const VMStateInfo vmstate_info_bool = {
701 static int get_int8(QEMUFile *f, void *pv, size_t size)
708 static void put_int8(QEMUFile *f, void *pv, size_t size)
714 const VMStateInfo vmstate_info_int8 = {
722 static int get_int16(QEMUFile *f, void *pv, size_t size)
725 qemu_get_sbe16s(f, v);
729 static void put_int16(QEMUFile *f, void *pv, size_t size)
732 qemu_put_sbe16s(f, v);
735 const VMStateInfo vmstate_info_int16 = {
743 static int get_int32(QEMUFile *f, void *pv, size_t size)
746 qemu_get_sbe32s(f, v);
750 static void put_int32(QEMUFile *f, void *pv, size_t size)
753 qemu_put_sbe32s(f, v);
756 const VMStateInfo vmstate_info_int32 = {
762 /* 32 bit int. See that the received value is the same than the one
765 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
769 qemu_get_sbe32s(f, &v2);
776 const VMStateInfo vmstate_info_int32_equal = {
777 .name = "int32 equal",
778 .get = get_int32_equal,
782 /* 32 bit int. See that the received value is the less or the same
783 than the one in the field */
785 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
789 qemu_get_sbe32s(f, &new);
796 const VMStateInfo vmstate_info_int32_le = {
797 .name = "int32 equal",
804 static int get_int64(QEMUFile *f, void *pv, size_t size)
807 qemu_get_sbe64s(f, v);
811 static void put_int64(QEMUFile *f, void *pv, size_t size)
814 qemu_put_sbe64s(f, v);
817 const VMStateInfo vmstate_info_int64 = {
823 /* 8 bit unsigned int */
825 static int get_uint8(QEMUFile *f, void *pv, size_t size)
832 static void put_uint8(QEMUFile *f, void *pv, size_t size)
838 const VMStateInfo vmstate_info_uint8 = {
844 /* 16 bit unsigned int */
846 static int get_uint16(QEMUFile *f, void *pv, size_t size)
849 qemu_get_be16s(f, v);
853 static void put_uint16(QEMUFile *f, void *pv, size_t size)
856 qemu_put_be16s(f, v);
859 const VMStateInfo vmstate_info_uint16 = {
865 /* 32 bit unsigned int */
867 static int get_uint32(QEMUFile *f, void *pv, size_t size)
870 qemu_get_be32s(f, v);
874 static void put_uint32(QEMUFile *f, void *pv, size_t size)
877 qemu_put_be32s(f, v);
880 const VMStateInfo vmstate_info_uint32 = {
886 /* 64 bit unsigned int */
888 static int get_uint64(QEMUFile *f, void *pv, size_t size)
891 qemu_get_be64s(f, v);
895 static void put_uint64(QEMUFile *f, void *pv, size_t size)
898 qemu_put_be64s(f, v);
901 const VMStateInfo vmstate_info_uint64 = {
907 /* 8 bit int. See that the received value is the same than the one
910 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
921 const VMStateInfo vmstate_info_uint8_equal = {
922 .name = "uint8 equal",
923 .get = get_uint8_equal,
927 /* 16 bit unsigned int int. See that the received value is the same than the one
930 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
934 qemu_get_be16s(f, &v2);
941 const VMStateInfo vmstate_info_uint16_equal = {
942 .name = "uint16 equal",
943 .get = get_uint16_equal,
949 static int get_timer(QEMUFile *f, void *pv, size_t size)
952 qemu_get_timer(f, v);
956 static void put_timer(QEMUFile *f, void *pv, size_t size)
959 qemu_put_timer(f, v);
962 const VMStateInfo vmstate_info_timer = {
968 /* uint8_t buffers */
970 static int get_buffer(QEMUFile *f, void *pv, size_t size)
973 qemu_get_buffer(f, v, size);
977 static void put_buffer(QEMUFile *f, void *pv, size_t size)
980 qemu_put_buffer(f, v, size);
983 const VMStateInfo vmstate_info_buffer = {
989 /* unused buffers: space that was used for some fields that are
990 not usefull anymore */
992 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
998 block_len = MIN(sizeof(buf), size);
1000 qemu_get_buffer(f, buf, block_len);
1005 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1007 static const uint8_t buf[1024];
1011 block_len = MIN(sizeof(buf), size);
1013 qemu_put_buffer(f, buf, block_len);
1017 const VMStateInfo vmstate_info_unused_buffer = {
1018 .name = "unused_buffer",
1019 .get = get_unused_buffer,
1020 .put = put_unused_buffer,
1023 typedef struct CompatEntry {
1028 typedef struct SaveStateEntry {
1029 QTAILQ_ENTRY(SaveStateEntry) entry;
1035 SaveSetParamsHandler *set_params;
1036 SaveLiveStateHandler *save_live_state;
1037 SaveStateHandler *save_state;
1038 LoadStateHandler *load_state;
1039 const VMStateDescription *vmsd;
1041 CompatEntry *compat;
1046 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1047 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1048 static int global_section_id;
1050 static int calculate_new_instance_id(const char *idstr)
1053 int instance_id = 0;
1055 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1056 if (strcmp(idstr, se->idstr) == 0
1057 && instance_id <= se->instance_id) {
1058 instance_id = se->instance_id + 1;
1064 static int calculate_compat_instance_id(const char *idstr)
1067 int instance_id = 0;
1069 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1073 if (strcmp(idstr, se->compat->idstr) == 0
1074 && instance_id <= se->compat->instance_id) {
1075 instance_id = se->compat->instance_id + 1;
1081 /* TODO: Individual devices generally have very little idea about the rest
1082 of the system, so instance_id should be removed/replaced.
1083 Meanwhile pass -1 as instance_id if you do not already have a clearly
1084 distinguishing id for all instances of your device class. */
1085 int register_savevm_live(DeviceState *dev,
1089 SaveSetParamsHandler *set_params,
1090 SaveLiveStateHandler *save_live_state,
1091 SaveStateHandler *save_state,
1092 LoadStateHandler *load_state,
1097 se = qemu_mallocz(sizeof(SaveStateEntry));
1098 se->version_id = version_id;
1099 se->section_id = global_section_id++;
1100 se->set_params = set_params;
1101 se->save_live_state = save_live_state;
1102 se->save_state = save_state;
1103 se->load_state = load_state;
1104 se->opaque = opaque;
1108 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1109 char *id = dev->parent_bus->info->get_dev_path(dev);
1111 pstrcpy(se->idstr, sizeof(se->idstr), id);
1112 pstrcat(se->idstr, sizeof(se->idstr), "/");
1115 se->compat = qemu_mallocz(sizeof(CompatEntry));
1116 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1117 se->compat->instance_id = instance_id == -1 ?
1118 calculate_compat_instance_id(idstr) : instance_id;
1122 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1124 if (instance_id == -1) {
1125 se->instance_id = calculate_new_instance_id(se->idstr);
1127 se->instance_id = instance_id;
1129 assert(!se->compat || se->instance_id == 0);
1130 /* add at the end of list */
1131 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1135 int register_savevm(DeviceState *dev,
1139 SaveStateHandler *save_state,
1140 LoadStateHandler *load_state,
1143 return register_savevm_live(dev, idstr, instance_id, version_id,
1144 NULL, NULL, save_state, load_state, opaque);
1147 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1149 SaveStateEntry *se, *new_se;
1152 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1153 char *path = dev->parent_bus->info->get_dev_path(dev);
1155 pstrcpy(id, sizeof(id), path);
1156 pstrcat(id, sizeof(id), "/");
1160 pstrcat(id, sizeof(id), idstr);
1162 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1163 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1164 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1166 qemu_free(se->compat);
1173 /* mark a device as not to be migrated, that is the device should be
1174 unplugged before migration */
1175 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1181 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1182 char *path = dev->parent_bus->info->get_dev_path(dev);
1184 pstrcpy(id, sizeof(id), path);
1185 pstrcat(id, sizeof(id), "/");
1189 pstrcat(id, sizeof(id), idstr);
1191 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1192 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1198 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1199 const VMStateDescription *vmsd,
1200 void *opaque, int alias_id,
1201 int required_for_version)
1205 /* If this triggers, alias support can be dropped for the vmsd. */
1206 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1208 se = qemu_mallocz(sizeof(SaveStateEntry));
1209 se->version_id = vmsd->version_id;
1210 se->section_id = global_section_id++;
1211 se->save_live_state = NULL;
1212 se->save_state = NULL;
1213 se->load_state = NULL;
1214 se->opaque = opaque;
1216 se->alias_id = alias_id;
1218 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1219 char *id = dev->parent_bus->info->get_dev_path(dev);
1221 pstrcpy(se->idstr, sizeof(se->idstr), id);
1222 pstrcat(se->idstr, sizeof(se->idstr), "/");
1225 se->compat = qemu_mallocz(sizeof(CompatEntry));
1226 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1227 se->compat->instance_id = instance_id == -1 ?
1228 calculate_compat_instance_id(vmsd->name) : instance_id;
1232 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1234 if (instance_id == -1) {
1235 se->instance_id = calculate_new_instance_id(se->idstr);
1237 se->instance_id = instance_id;
1239 assert(!se->compat || se->instance_id == 0);
1240 /* add at the end of list */
1241 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1245 int vmstate_register(DeviceState *dev, int instance_id,
1246 const VMStateDescription *vmsd, void *opaque)
1248 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1252 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1255 SaveStateEntry *se, *new_se;
1257 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1258 if (se->vmsd == vmsd && se->opaque == opaque) {
1259 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1261 qemu_free(se->compat);
1268 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1270 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1273 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1274 void *opaque, int version_id)
1276 VMStateField *field = vmsd->fields;
1279 if (version_id > vmsd->version_id) {
1282 if (version_id < vmsd->minimum_version_id_old) {
1285 if (version_id < vmsd->minimum_version_id) {
1286 return vmsd->load_state_old(f, opaque, version_id);
1288 if (vmsd->pre_load) {
1289 int ret = vmsd->pre_load(opaque);
1293 while(field->name) {
1294 if ((field->field_exists &&
1295 field->field_exists(opaque, version_id)) ||
1296 (!field->field_exists &&
1297 field->version_id <= version_id)) {
1298 void *base_addr = opaque + field->offset;
1300 int size = field->size;
1302 if (field->flags & VMS_VBUFFER) {
1303 size = *(int32_t *)(opaque+field->size_offset);
1304 if (field->flags & VMS_MULTIPLY) {
1305 size *= field->size;
1308 if (field->flags & VMS_ARRAY) {
1309 n_elems = field->num;
1310 } else if (field->flags & VMS_VARRAY_INT32) {
1311 n_elems = *(int32_t *)(opaque+field->num_offset);
1312 } else if (field->flags & VMS_VARRAY_UINT16) {
1313 n_elems = *(uint16_t *)(opaque+field->num_offset);
1315 if (field->flags & VMS_POINTER) {
1316 base_addr = *(void **)base_addr + field->start;
1318 for (i = 0; i < n_elems; i++) {
1319 void *addr = base_addr + size * i;
1321 if (field->flags & VMS_ARRAY_OF_POINTER) {
1322 addr = *(void **)addr;
1324 if (field->flags & VMS_STRUCT) {
1325 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1327 ret = field->info->get(f, addr, size);
1337 ret = vmstate_subsection_load(f, vmsd, opaque);
1341 if (vmsd->post_load) {
1342 return vmsd->post_load(opaque, version_id);
1347 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1350 VMStateField *field = vmsd->fields;
1352 if (vmsd->pre_save) {
1353 vmsd->pre_save(opaque);
1355 while(field->name) {
1356 if (!field->field_exists ||
1357 field->field_exists(opaque, vmsd->version_id)) {
1358 void *base_addr = opaque + field->offset;
1360 int size = field->size;
1362 if (field->flags & VMS_VBUFFER) {
1363 size = *(int32_t *)(opaque+field->size_offset);
1364 if (field->flags & VMS_MULTIPLY) {
1365 size *= field->size;
1368 if (field->flags & VMS_ARRAY) {
1369 n_elems = field->num;
1370 } else if (field->flags & VMS_VARRAY_INT32) {
1371 n_elems = *(int32_t *)(opaque+field->num_offset);
1372 } else if (field->flags & VMS_VARRAY_UINT16) {
1373 n_elems = *(uint16_t *)(opaque+field->num_offset);
1375 if (field->flags & VMS_POINTER) {
1376 base_addr = *(void **)base_addr + field->start;
1378 for (i = 0; i < n_elems; i++) {
1379 void *addr = base_addr + size * i;
1381 if (field->flags & VMS_ARRAY_OF_POINTER) {
1382 addr = *(void **)addr;
1384 if (field->flags & VMS_STRUCT) {
1385 vmstate_save_state(f, field->vmsd, addr);
1387 field->info->put(f, addr, size);
1393 vmstate_subsection_save(f, vmsd, opaque);
1396 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1398 if (!se->vmsd) { /* Old style */
1399 return se->load_state(f, se->opaque, version_id);
1401 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1404 static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
1406 if (se->no_migrate) {
1410 if (!se->vmsd) { /* Old style */
1411 se->save_state(f, se->opaque);
1414 vmstate_save_state(f,se->vmsd, se->opaque);
1419 #define QEMU_VM_FILE_MAGIC 0x5145564d
1420 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1421 #define QEMU_VM_FILE_VERSION 0x00000003
1423 #define QEMU_VM_EOF 0x00
1424 #define QEMU_VM_SECTION_START 0x01
1425 #define QEMU_VM_SECTION_PART 0x02
1426 #define QEMU_VM_SECTION_END 0x03
1427 #define QEMU_VM_SECTION_FULL 0x04
1428 #define QEMU_VM_SUBSECTION 0x05
1430 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1435 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1436 if(se->set_params == NULL) {
1439 se->set_params(blk_enable, shared, se->opaque);
1442 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1443 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1445 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1448 if (se->save_live_state == NULL)
1452 qemu_put_byte(f, QEMU_VM_SECTION_START);
1453 qemu_put_be32(f, se->section_id);
1456 len = strlen(se->idstr);
1457 qemu_put_byte(f, len);
1458 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1460 qemu_put_be32(f, se->instance_id);
1461 qemu_put_be32(f, se->version_id);
1463 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1466 if (qemu_file_has_error(f)) {
1467 qemu_savevm_state_cancel(mon, f);
1474 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1479 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1480 if (se->save_live_state == NULL)
1484 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1485 qemu_put_be32(f, se->section_id);
1487 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1489 /* Do not proceed to the next vmstate before this one reported
1490 completion of the current stage. This serializes the migration
1491 and reduces the probability that a faster changing state is
1492 synchronized over and over again. */
1500 if (qemu_file_has_error(f)) {
1501 qemu_savevm_state_cancel(mon, f);
1508 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1513 cpu_synchronize_all_states();
1515 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1516 if (se->save_live_state == NULL)
1520 qemu_put_byte(f, QEMU_VM_SECTION_END);
1521 qemu_put_be32(f, se->section_id);
1523 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1526 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1529 if (se->save_state == NULL && se->vmsd == NULL)
1533 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1534 qemu_put_be32(f, se->section_id);
1537 len = strlen(se->idstr);
1538 qemu_put_byte(f, len);
1539 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1541 qemu_put_be32(f, se->instance_id);
1542 qemu_put_be32(f, se->version_id);
1544 r = vmstate_save(f, se);
1546 monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
1551 qemu_put_byte(f, QEMU_VM_EOF);
1553 if (qemu_file_has_error(f))
1559 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1563 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1564 if (se->save_live_state) {
1565 se->save_live_state(mon, f, -1, se->opaque);
1570 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1572 int saved_vm_running;
1575 saved_vm_running = vm_running;
1578 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1583 ret = qemu_savevm_state_iterate(mon, f);
1588 ret = qemu_savevm_state_complete(mon, f);
1591 if (qemu_file_has_error(f))
1594 if (!ret && saved_vm_running)
1600 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1604 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1605 if (!strcmp(se->idstr, idstr) &&
1606 (instance_id == se->instance_id ||
1607 instance_id == se->alias_id))
1609 /* Migrating from an older version? */
1610 if (strstr(se->idstr, idstr) && se->compat) {
1611 if (!strcmp(se->compat->idstr, idstr) &&
1612 (instance_id == se->compat->instance_id ||
1613 instance_id == se->alias_id))
1620 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1622 while(sub && sub->needed) {
1623 if (strcmp(idstr, sub->vmsd->name) == 0) {
1631 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1634 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1637 uint8_t version_id, len;
1638 const VMStateDescription *sub_vmsd;
1640 qemu_get_byte(f); /* subsection */
1641 len = qemu_get_byte(f);
1642 qemu_get_buffer(f, (uint8_t *)idstr, len);
1644 version_id = qemu_get_be32(f);
1646 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1647 if (sub_vmsd == NULL) {
1650 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1658 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1661 const VMStateSubsection *sub = vmsd->subsections;
1663 while (sub && sub->needed) {
1664 if (sub->needed(opaque)) {
1665 const VMStateDescription *vmsd = sub->vmsd;
1668 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1669 len = strlen(vmsd->name);
1670 qemu_put_byte(f, len);
1671 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1672 qemu_put_be32(f, vmsd->version_id);
1673 vmstate_save_state(f, vmsd, opaque);
1679 typedef struct LoadStateEntry {
1680 QLIST_ENTRY(LoadStateEntry) entry;
1686 int qemu_loadvm_state(QEMUFile *f)
1688 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1689 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1690 LoadStateEntry *le, *new_le;
1691 uint8_t section_type;
1695 v = qemu_get_be32(f);
1696 if (v != QEMU_VM_FILE_MAGIC)
1699 v = qemu_get_be32(f);
1700 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1701 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1704 if (v != QEMU_VM_FILE_VERSION)
1707 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1708 uint32_t instance_id, version_id, section_id;
1713 switch (section_type) {
1714 case QEMU_VM_SECTION_START:
1715 case QEMU_VM_SECTION_FULL:
1716 /* Read section start */
1717 section_id = qemu_get_be32(f);
1718 len = qemu_get_byte(f);
1719 qemu_get_buffer(f, (uint8_t *)idstr, len);
1721 instance_id = qemu_get_be32(f);
1722 version_id = qemu_get_be32(f);
1724 /* Find savevm section */
1725 se = find_se(idstr, instance_id);
1727 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1732 /* Validate version */
1733 if (version_id > se->version_id) {
1734 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1735 version_id, idstr, se->version_id);
1741 le = qemu_mallocz(sizeof(*le));
1744 le->section_id = section_id;
1745 le->version_id = version_id;
1746 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1748 ret = vmstate_load(f, le->se, le->version_id);
1750 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1751 instance_id, idstr);
1755 case QEMU_VM_SECTION_PART:
1756 case QEMU_VM_SECTION_END:
1757 section_id = qemu_get_be32(f);
1759 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1760 if (le->section_id == section_id) {
1765 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1770 ret = vmstate_load(f, le->se, le->version_id);
1772 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1778 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1784 cpu_synchronize_all_post_init();
1789 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1790 QLIST_REMOVE(le, entry);
1794 if (qemu_file_has_error(f))
1800 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1803 QEMUSnapshotInfo *sn_tab, *sn;
1807 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1810 for(i = 0; i < nb_sns; i++) {
1812 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1823 * Deletes snapshots of a given name in all opened images.
1825 static int del_existing_snapshots(Monitor *mon, const char *name)
1827 BlockDriverState *bs;
1828 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1832 while ((bs = bdrv_next(bs))) {
1833 if (bdrv_can_snapshot(bs) &&
1834 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1836 ret = bdrv_snapshot_delete(bs, name);
1839 "Error while deleting snapshot on '%s'\n",
1840 bdrv_get_device_name(bs));
1849 void do_savevm(Monitor *mon, const QDict *qdict)
1851 BlockDriverState *bs, *bs1;
1852 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1855 int saved_vm_running;
1856 uint32_t vm_state_size;
1864 const char *name = qdict_get_try_str(qdict, "name");
1866 /* Verify if there is a device that doesn't support snapshots and is writable */
1868 while ((bs = bdrv_next(bs))) {
1870 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1874 if (!bdrv_can_snapshot(bs)) {
1875 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1876 bdrv_get_device_name(bs));
1881 bs = bdrv_snapshots();
1883 monitor_printf(mon, "No block device can accept snapshots\n");
1887 saved_vm_running = vm_running;
1890 memset(sn, 0, sizeof(*sn));
1892 /* fill auxiliary fields */
1895 sn->date_sec = tb.time;
1896 sn->date_nsec = tb.millitm * 1000000;
1898 gettimeofday(&tv, NULL);
1899 sn->date_sec = tv.tv_sec;
1900 sn->date_nsec = tv.tv_usec * 1000;
1902 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1905 ret = bdrv_snapshot_find(bs, old_sn, name);
1907 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1908 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1910 pstrcpy(sn->name, sizeof(sn->name), name);
1914 ptm = localtime(&tb.time);
1915 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1917 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1918 localtime_r((const time_t *)&tv.tv_sec, &tm);
1919 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1923 /* Delete old snapshots of the same name */
1924 if (name && del_existing_snapshots(mon, name) < 0) {
1928 /* save the VM state */
1929 f = qemu_fopen_bdrv(bs, 1);
1931 monitor_printf(mon, "Could not open VM state file\n");
1934 ret = qemu_savevm_state(mon, f);
1935 vm_state_size = qemu_ftell(f);
1938 monitor_printf(mon, "Error %d while writing VM\n", ret);
1942 /* create the snapshots */
1945 while ((bs1 = bdrv_next(bs1))) {
1946 if (bdrv_can_snapshot(bs1)) {
1947 /* Write VM state size only to the image that contains the state */
1948 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1949 ret = bdrv_snapshot_create(bs1, sn);
1951 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1952 bdrv_get_device_name(bs1));
1958 if (saved_vm_running)
1962 int load_vmstate(const char *name)
1964 BlockDriverState *bs, *bs_vm_state;
1965 QEMUSnapshotInfo sn;
1969 bs_vm_state = bdrv_snapshots();
1971 error_report("No block device supports snapshots");
1975 /* Don't even try to load empty VM states */
1976 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1979 } else if (sn.vm_state_size == 0) {
1983 /* Verify if there is any device that doesn't support snapshots and is
1984 writable and check if the requested snapshot is available too. */
1986 while ((bs = bdrv_next(bs))) {
1988 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1992 if (!bdrv_can_snapshot(bs)) {
1993 error_report("Device '%s' is writable but does not support snapshots.",
1994 bdrv_get_device_name(bs));
1998 ret = bdrv_snapshot_find(bs, &sn, name);
2000 error_report("Device '%s' does not have the requested snapshot '%s'",
2001 bdrv_get_device_name(bs), name);
2006 /* Flush all IO requests so they don't interfere with the new state. */
2010 while ((bs = bdrv_next(bs))) {
2011 if (bdrv_can_snapshot(bs)) {
2012 ret = bdrv_snapshot_goto(bs, name);
2014 error_report("Error %d while activating snapshot '%s' on '%s'",
2015 ret, name, bdrv_get_device_name(bs));
2021 /* restore the VM state */
2022 f = qemu_fopen_bdrv(bs_vm_state, 0);
2024 error_report("Could not open VM state file");
2028 ret = qemu_loadvm_state(f);
2032 error_report("Error %d while loading VM state", ret);
2039 void do_delvm(Monitor *mon, const QDict *qdict)
2041 BlockDriverState *bs, *bs1;
2043 const char *name = qdict_get_str(qdict, "name");
2045 bs = bdrv_snapshots();
2047 monitor_printf(mon, "No block device supports snapshots\n");
2052 while ((bs1 = bdrv_next(bs1))) {
2053 if (bdrv_can_snapshot(bs1)) {
2054 ret = bdrv_snapshot_delete(bs1, name);
2056 if (ret == -ENOTSUP)
2058 "Snapshots not supported on device '%s'\n",
2059 bdrv_get_device_name(bs1));
2061 monitor_printf(mon, "Error %d while deleting snapshot on "
2062 "'%s'\n", ret, bdrv_get_device_name(bs1));
2068 void do_info_snapshots(Monitor *mon)
2070 BlockDriverState *bs, *bs1;
2071 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2072 int nb_sns, i, ret, available;
2074 int *available_snapshots;
2077 bs = bdrv_snapshots();
2079 monitor_printf(mon, "No available block device supports snapshots\n");
2083 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2085 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2090 monitor_printf(mon, "There is no snapshot available.\n");
2094 available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2096 for (i = 0; i < nb_sns; i++) {
2101 while ((bs1 = bdrv_next(bs1))) {
2102 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2103 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2112 available_snapshots[total] = i;
2118 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2119 for (i = 0; i < total; i++) {
2120 sn = &sn_tab[available_snapshots[i]];
2121 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2124 monitor_printf(mon, "There is no suitable snapshot available\n");
2128 qemu_free(available_snapshots);