savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   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:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  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
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <time.h>
  27 #include <errno.h>
  28 #include <sys/time.h>
  29 #include <zlib.h>
  30
  31 /* Needed early for CONFIG_BSD etc. */
  32 #include "config-host.h"
  33
  34 #ifndef _WIN32
  35 #include <sys/times.h>
  36 #include <sys/wait.h>
  37 #include <termios.h>
  38 #include <sys/mman.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/resource.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <net/if.h>
  44 #include <arpa/inet.h>
  45 #include <dirent.h>
  46 #include <netdb.h>
  47 #include <sys/select.h>
  48 #ifdef CONFIG_BSD
  49 #include <sys/stat.h>
  50 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  51 #include <libutil.h>
  52 #else
  53 #include <util.h>
  54 #endif
  55 #ifdef __linux__
  56 #include <pty.h>
  57 #include <malloc.h>
  58 #include <linux/rtc.h>
  59 #endif
  60 #endif
  61 #endif
  62
  63 #ifdef _WIN32
  64 #include <windows.h>
  65 #include <malloc.h>
  66 #include <sys/timeb.h>
  67 #include <mmsystem.h>
  68 #define getopt_long_only getopt_long
  69 #define memalign(align, size) malloc(size)
  70 #endif
  71
  72 #include "qemu-common.h"
  73 #include "hw/hw.h"
  74 #include "hw/qdev.h"
  75 #include "net.h"
  76 #include "monitor.h"
  77 #include "sysemu.h"
  78 #include "qemu-timer.h"
  79 #include "qemu-char.h"
  80 #include "audio/audio.h"
  81 #include "migration.h"
  82 #include "qemu_socket.h"
  83 #include "qemu-queue.h"
  84 #include "qemu-timer.h"
  85 #include "cpus.h"
  86 #include "memory.h"
  87
  88 #define SELF_ANNOUNCE_ROUNDS 5
  89
  90 #ifndef ETH_P_RARP
  91 #define ETH_P_RARP 0x8035
  92 #endif
  93 #define ARP_HTYPE_ETH 0x0001
  94 #define ARP_PTYPE_IP 0x0800
  95 #define ARP_OP_REQUEST_REV 0x3
  96
  97 static int announce_self_create(uint8_t *buf,
  98                                 uint8_t *mac_addr)
  99 {
 100     /* Ethernet header. */
 101     memset(buf, 0xff, 6);         /* destination MAC addr */
 102     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 103     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 104
 105     /* RARP header. */
 106     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 107     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 108     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 109     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 110     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 111     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 112     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 113     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 114     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 115
 116     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 117     memset(buf + 42, 0x00, 18);
 118
 119     return 60; /* len (FCS will be added by hardware) */
 120 }
 121
 122 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 123 {
 124     uint8_t buf[60];
 125     int len;
 126
 127     len = announce_self_create(buf, nic->conf->macaddr.a);
 128
 129     qemu_send_packet_raw(&nic->nc, buf, len);
 130 }
 131
 132
 133 static void qemu_announce_self_once(void *opaque)
 134 {
 135     static int count = SELF_ANNOUNCE_ROUNDS;
 136     QEMUTimer *timer = *(QEMUTimer **)opaque;
 137
 138     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 139
 140     if (--count) {
 141         /* delay 50ms, 150ms, 250ms, ... */
 142         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 143                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 144     } else {
 145             qemu_del_timer(timer);
 146             qemu_free_timer(timer);
 147     }
 148 }
 149
 150 void qemu_announce_self(void)
 151 {
 152         static QEMUTimer *timer;
 153         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 154         qemu_announce_self_once(&timer);
 155 }
 156
 157 /***********************************************************/
 158 /* savevm/loadvm support */
 159
 160 #define IO_BUF_SIZE 32768
 161
 162 struct QEMUFile {
 163     QEMUFilePutBufferFunc *put_buffer;
 164     QEMUFileGetBufferFunc *get_buffer;
 165     QEMUFileCloseFunc *close;
 166     QEMUFileRateLimit *rate_limit;
 167     QEMUFileSetRateLimit *set_rate_limit;
 168     QEMUFileGetRateLimit *get_rate_limit;
 169     void *opaque;
 170     int is_write;
 171
 172     int64_t buf_offset; /* start of buffer when writing, end of buffer
 173                            when reading */
 174     int buf_index;
 175     int buf_size; /* 0 when writing */
 176     uint8_t buf[IO_BUF_SIZE];
 177
 178     int last_error;
 179 };
 180
 181 typedef struct QEMUFileStdio
 182 {
 183     FILE *stdio_file;
 184     QEMUFile *file;
 185 } QEMUFileStdio;
 186
 187 typedef struct QEMUFileSocket
 188 {
 189     int fd;
 190     QEMUFile *file;
 191 } QEMUFileSocket;
 192
 193 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 194 {
 195     QEMUFileSocket *s = opaque;
 196     ssize_t len;
 197
 198     do {
 199         len = qemu_recv(s->fd, buf, size, 0);
 200     } while (len == -1 && socket_error() == EINTR);
 201
 202     if (len == -1)
 203         len = -socket_error();
 204
 205     return len;
 206 }
 207
 208 static int socket_close(void *opaque)
 209 {
 210     QEMUFileSocket *s = opaque;
 211     g_free(s);
 212     return 0;
 213 }
 214
 215 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 216 {
 217     QEMUFileStdio *s = opaque;
 218     return fwrite(buf, 1, size, s->stdio_file);
 219 }
 220
 221 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 222 {
 223     QEMUFileStdio *s = opaque;
 224     FILE *fp = s->stdio_file;
 225     int bytes;
 226
 227     do {
 228         clearerr(fp);
 229         bytes = fread(buf, 1, size, fp);
 230     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 231     return bytes;
 232 }
 233
 234 static int stdio_pclose(void *opaque)
 235 {
 236     QEMUFileStdio *s = opaque;
 237     int ret;
 238     ret = pclose(s->stdio_file);
 239     if (ret == -1) {
 240         ret = -errno;
 241     }
 242     g_free(s);
 243     return ret;
 244 }
 245
 246 static int stdio_fclose(void *opaque)
 247 {
 248     QEMUFileStdio *s = opaque;
 249     int ret = 0;
 250     if (fclose(s->stdio_file) == EOF) {
 251         ret = -errno;
 252     }
 253     g_free(s);
 254     return ret;
 255 }
 256
 257 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 258 {
 259     QEMUFileStdio *s;
 260
 261     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 262         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 263         return NULL;
 264     }
 265
 266     s = g_malloc0(sizeof(QEMUFileStdio));
 267
 268     s->stdio_file = stdio_file;
 269
 270     if(mode[0] == 'r') {
 271         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 272                                  NULL, NULL, NULL);
 273     } else {
 274         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 275                                  NULL, NULL, NULL);
 276     }
 277     return s->file;
 278 }
 279
 280 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 281 {
 282     FILE *popen_file;
 283
 284     popen_file = popen(command, mode);
 285     if(popen_file == NULL) {
 286         return NULL;
 287     }
 288
 289     return qemu_popen(popen_file, mode);
 290 }
 291
 292 int qemu_stdio_fd(QEMUFile *f)
 293 {
 294     QEMUFileStdio *p;
 295     int fd;
 296
 297     p = (QEMUFileStdio *)f->opaque;
 298     fd = fileno(p->stdio_file);
 299
 300     return fd;
 301 }
 302
 303 QEMUFile *qemu_fdopen(int fd, const char *mode)
 304 {
 305     QEMUFileStdio *s;
 306
 307     if (mode == NULL ||
 308         (mode[0] != 'r' && mode[0] != 'w') ||
 309         mode[1] != 'b' || mode[2] != 0) {
 310         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 311         return NULL;
 312     }
 313
 314     s = g_malloc0(sizeof(QEMUFileStdio));
 315     s->stdio_file = fdopen(fd, mode);
 316     if (!s->stdio_file)
 317         goto fail;
 318
 319     if(mode[0] == 'r') {
 320         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 321                                  NULL, NULL, NULL);
 322     } else {
 323         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 324                                  NULL, NULL, NULL);
 325     }
 326     return s->file;
 327
 328 fail:
 329     g_free(s);
 330     return NULL;
 331 }
 332
 333 QEMUFile *qemu_fopen_socket(int fd)
 334 {
 335     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 336
 337     s->fd = fd;
 338     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 339                              NULL, NULL, NULL);
 340     return s->file;
 341 }
 342
 343 static int file_put_buffer(void *opaque, const uint8_t *buf,
 344                             int64_t pos, int size)
 345 {
 346     QEMUFileStdio *s = opaque;
 347     fseek(s->stdio_file, pos, SEEK_SET);
 348     return fwrite(buf, 1, size, s->stdio_file);
 349 }
 350
 351 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 352 {
 353     QEMUFileStdio *s = opaque;
 354     fseek(s->stdio_file, pos, SEEK_SET);
 355     return fread(buf, 1, size, s->stdio_file);
 356 }
 357
 358 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 359 {
 360     QEMUFileStdio *s;
 361
 362     if (mode == NULL ||
 363         (mode[0] != 'r' && mode[0] != 'w') ||
 364         mode[1] != 'b' || mode[2] != 0) {
 365         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 366         return NULL;
 367     }
 368
 369     s = g_malloc0(sizeof(QEMUFileStdio));
 370
 371     s->stdio_file = fopen(filename, mode);
 372     if (!s->stdio_file)
 373         goto fail;
 374
 375     if(mode[0] == 'w') {
 376         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 377                                  NULL, NULL, NULL);
 378     } else {
 379         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 380                                NULL, NULL, NULL);
 381     }
 382     return s->file;
 383 fail:
 384     g_free(s);
 385     return NULL;
 386 }
 387
 388 static int block_put_buffer(void *opaque, const uint8_t *buf,
 389                            int64_t pos, int size)
 390 {
 391     bdrv_save_vmstate(opaque, buf, pos, size);
 392     return size;
 393 }
 394
 395 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 396 {
 397     return bdrv_load_vmstate(opaque, buf, pos, size);
 398 }
 399
 400 static int bdrv_fclose(void *opaque)
 401 {
 402     return 0;
 403 }
 404
 405 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 406 {
 407     if (is_writable)
 408         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 409                               NULL, NULL, NULL);
 410     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 411 }
 412
 413 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 414                          QEMUFileGetBufferFunc *get_buffer,
 415                          QEMUFileCloseFunc *close,
 416                          QEMUFileRateLimit *rate_limit,
 417                          QEMUFileSetRateLimit *set_rate_limit,
 418                          QEMUFileGetRateLimit *get_rate_limit)
 419 {
 420     QEMUFile *f;
 421
 422     f = g_malloc0(sizeof(QEMUFile));
 423
 424     f->opaque = opaque;
 425     f->put_buffer = put_buffer;
 426     f->get_buffer = get_buffer;
 427     f->close = close;
 428     f->rate_limit = rate_limit;
 429     f->set_rate_limit = set_rate_limit;
 430     f->get_rate_limit = get_rate_limit;
 431     f->is_write = 0;
 432
 433     return f;
 434 }
 435
 436 int qemu_file_get_error(QEMUFile *f)
 437 {
 438     return f->last_error;
 439 }
 440
 441 void qemu_file_set_error(QEMUFile *f, int ret)
 442 {
 443     f->last_error = ret;
 444 }
 445
 446 /** Sets last_error conditionally
 447  *
 448  * Sets last_error only if ret is negative _and_ no error
 449  * was set before.
 450  */
 451 static void qemu_file_set_if_error(QEMUFile *f, int ret)
 452 {
 453     if (ret < 0 && !f->last_error) {
 454         qemu_file_set_error(f, ret);
 455     }
 456 }
 457
 458 /** Flushes QEMUFile buffer
 459  *
 460  * In case of error, last_error is set.
 461  */
 462 void qemu_fflush(QEMUFile *f)
 463 {
 464     if (!f->put_buffer)
 465         return;
 466
 467     if (f->is_write && f->buf_index > 0) {
 468         int len;
 469
 470         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 471         if (len > 0)
 472             f->buf_offset += f->buf_index;
 473         else
 474             qemu_file_set_error(f, -EINVAL);
 475         f->buf_index = 0;
 476     }
 477 }
 478
 479 static void qemu_fill_buffer(QEMUFile *f)
 480 {
 481     int len;
 482     int pending;
 483
 484     if (!f->get_buffer)
 485         return;
 486
 487     if (f->is_write)
 488         abort();
 489
 490     pending = f->buf_size - f->buf_index;
 491     if (pending > 0) {
 492         memmove(f->buf, f->buf + f->buf_index, pending);
 493     }
 494     f->buf_index = 0;
 495     f->buf_size = pending;
 496
 497     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 498                         IO_BUF_SIZE - pending);
 499     if (len > 0) {
 500         f->buf_size += len;
 501         f->buf_offset += len;
 502     } else if (len == 0) {
 503         f->last_error = -EIO;
 504     } else if (len != -EAGAIN)
 505         qemu_file_set_error(f, len);
 506 }
 507
 508 /** Calls close function and set last_error if needed
 509  *
 510  * Internal function. qemu_fflush() must be called before this.
 511  *
 512  * Returns f->close() return value, or 0 if close function is not set.
 513  */
 514 static int qemu_close(QEMUFile *f)
 515 {
 516     int ret = 0;
 517     if (f->close) {
 518         ret = f->close(f->opaque);
 519         qemu_file_set_if_error(f, ret);
 520     }
 521     return ret;
 522 }
 523
 524 /** Closes the file
 525  *
 526  * Returns negative error value if any error happened on previous operations or
 527  * while closing the file. Returns 0 or positive number on success.
 528  *
 529  * The meaning of return value on success depends on the specific backend
 530  * being used.
 531  */
 532 int qemu_fclose(QEMUFile *f)
 533 {
 534     int ret;
 535     qemu_fflush(f);
 536     ret = qemu_close(f);
 537     /* If any error was spotted before closing, we should report it
 538      * instead of the close() return value.
 539      */
 540     if (f->last_error) {
 541         ret = f->last_error;
 542     }
 543     g_free(f);
 544     return ret;
 545 }
 546
 547 void qemu_file_put_notify(QEMUFile *f)
 548 {
 549     f->put_buffer(f->opaque, NULL, 0, 0);
 550 }
 551
 552 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 553 {
 554     int l;
 555
 556     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 557         fprintf(stderr,
 558                 "Attempted to write to buffer while read buffer is not empty\n");
 559         abort();
 560     }
 561
 562     while (!f->last_error && size > 0) {
 563         l = IO_BUF_SIZE - f->buf_index;
 564         if (l > size)
 565             l = size;
 566         memcpy(f->buf + f->buf_index, buf, l);
 567         f->is_write = 1;
 568         f->buf_index += l;
 569         buf += l;
 570         size -= l;
 571         if (f->buf_index >= IO_BUF_SIZE)
 572             qemu_fflush(f);
 573     }
 574 }
 575
 576 void qemu_put_byte(QEMUFile *f, int v)
 577 {
 578     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 579         fprintf(stderr,
 580                 "Attempted to write to buffer while read buffer is not empty\n");
 581         abort();
 582     }
 583
 584     f->buf[f->buf_index++] = v;
 585     f->is_write = 1;
 586     if (f->buf_index >= IO_BUF_SIZE)
 587         qemu_fflush(f);
 588 }
 589
 590 static void qemu_file_skip(QEMUFile *f, int size)
 591 {
 592     if (f->buf_index + size <= f->buf_size) {
 593         f->buf_index += size;
 594     }
 595 }
 596
 597 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 598 {
 599     int pending;
 600     int index;
 601
 602     if (f->is_write) {
 603         abort();
 604     }
 605
 606     index = f->buf_index + offset;
 607     pending = f->buf_size - index;
 608     if (pending < size) {
 609         qemu_fill_buffer(f);
 610         index = f->buf_index + offset;
 611         pending = f->buf_size - index;
 612     }
 613
 614     if (pending <= 0) {
 615         return 0;
 616     }
 617     if (size > pending) {
 618         size = pending;
 619     }
 620
 621     memcpy(buf, f->buf + index, size);
 622     return size;
 623 }
 624
 625 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 626 {
 627     int pending = size;
 628     int done = 0;
 629
 630     while (pending > 0) {
 631         int res;
 632
 633         res = qemu_peek_buffer(f, buf, pending, 0);
 634         if (res == 0) {
 635             return done;
 636         }
 637         qemu_file_skip(f, res);
 638         buf += res;
 639         pending -= res;
 640         done += res;
 641     }
 642     return done;
 643 }
 644
 645 static int qemu_peek_byte(QEMUFile *f, int offset)
 646 {
 647     int index = f->buf_index + offset;
 648
 649     if (f->is_write) {
 650         abort();
 651     }
 652
 653     if (index >= f->buf_size) {
 654         qemu_fill_buffer(f);
 655         index = f->buf_index + offset;
 656         if (index >= f->buf_size) {
 657             return 0;
 658         }
 659     }
 660     return f->buf[index];
 661 }
 662
 663 int qemu_get_byte(QEMUFile *f)
 664 {
 665     int result;
 666
 667     result = qemu_peek_byte(f, 0);
 668     qemu_file_skip(f, 1);
 669     return result;
 670 }
 671
 672 int64_t qemu_ftell(QEMUFile *f)
 673 {
 674     return f->buf_offset - f->buf_size + f->buf_index;
 675 }
 676
 677 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 678 {
 679     if (whence == SEEK_SET) {
 680         /* nothing to do */
 681     } else if (whence == SEEK_CUR) {
 682         pos += qemu_ftell(f);
 683     } else {
 684         /* SEEK_END not supported */
 685         return -1;
 686     }
 687     if (f->put_buffer) {
 688         qemu_fflush(f);
 689         f->buf_offset = pos;
 690     } else {
 691         f->buf_offset = pos;
 692         f->buf_index = 0;
 693         f->buf_size = 0;
 694     }
 695     return pos;
 696 }
 697
 698 int qemu_file_rate_limit(QEMUFile *f)
 699 {
 700     if (f->rate_limit)
 701         return f->rate_limit(f->opaque);
 702
 703     return 0;
 704 }
 705
 706 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 707 {
 708     if (f->get_rate_limit)
 709         return f->get_rate_limit(f->opaque);
 710
 711     return 0;
 712 }
 713
 714 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 715 {
 716     /* any failed or completed migration keeps its state to allow probing of
 717      * migration data, but has no associated file anymore */
 718     if (f && f->set_rate_limit)
 719         return f->set_rate_limit(f->opaque, new_rate);
 720
 721     return 0;
 722 }
 723
 724 void qemu_put_be16(QEMUFile *f, unsigned int v)
 725 {
 726     qemu_put_byte(f, v >> 8);
 727     qemu_put_byte(f, v);
 728 }
 729
 730 void qemu_put_be32(QEMUFile *f, unsigned int v)
 731 {
 732     qemu_put_byte(f, v >> 24);
 733     qemu_put_byte(f, v >> 16);
 734     qemu_put_byte(f, v >> 8);
 735     qemu_put_byte(f, v);
 736 }
 737
 738 void qemu_put_be64(QEMUFile *f, uint64_t v)
 739 {
 740     qemu_put_be32(f, v >> 32);
 741     qemu_put_be32(f, v);
 742 }
 743
 744 unsigned int qemu_get_be16(QEMUFile *f)
 745 {
 746     unsigned int v;
 747     v = qemu_get_byte(f) << 8;
 748     v |= qemu_get_byte(f);
 749     return v;
 750 }
 751
 752 unsigned int qemu_get_be32(QEMUFile *f)
 753 {
 754     unsigned int v;
 755     v = qemu_get_byte(f) << 24;
 756     v |= qemu_get_byte(f) << 16;
 757     v |= qemu_get_byte(f) << 8;
 758     v |= qemu_get_byte(f);
 759     return v;
 760 }
 761
 762 uint64_t qemu_get_be64(QEMUFile *f)
 763 {
 764     uint64_t v;
 765     v = (uint64_t)qemu_get_be32(f) << 32;
 766     v |= qemu_get_be32(f);
 767     return v;
 768 }
 769
 770
 771 /* timer */
 772
 773 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 774 {
 775     uint64_t expire_time;
 776
 777     expire_time = qemu_timer_expire_time_ns(ts);
 778     qemu_put_be64(f, expire_time);
 779 }
 780
 781 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 782 {
 783     uint64_t expire_time;
 784
 785     expire_time = qemu_get_be64(f);
 786     if (expire_time != -1) {
 787         qemu_mod_timer_ns(ts, expire_time);
 788     } else {
 789         qemu_del_timer(ts);
 790     }
 791 }
 792
 793
 794 /* bool */
 795
 796 static int get_bool(QEMUFile *f, void *pv, size_t size)
 797 {
 798     bool *v = pv;
 799     *v = qemu_get_byte(f);
 800     return 0;
 801 }
 802
 803 static void put_bool(QEMUFile *f, void *pv, size_t size)
 804 {
 805     bool *v = pv;
 806     qemu_put_byte(f, *v);
 807 }
 808
 809 const VMStateInfo vmstate_info_bool = {
 810     .name = "bool",
 811     .get  = get_bool,
 812     .put  = put_bool,
 813 };
 814
 815 /* 8 bit int */
 816
 817 static int get_int8(QEMUFile *f, void *pv, size_t size)
 818 {
 819     int8_t *v = pv;
 820     qemu_get_s8s(f, v);
 821     return 0;
 822 }
 823
 824 static void put_int8(QEMUFile *f, void *pv, size_t size)
 825 {
 826     int8_t *v = pv;
 827     qemu_put_s8s(f, v);
 828 }
 829
 830 const VMStateInfo vmstate_info_int8 = {
 831     .name = "int8",
 832     .get  = get_int8,
 833     .put  = put_int8,
 834 };
 835
 836 /* 16 bit int */
 837
 838 static int get_int16(QEMUFile *f, void *pv, size_t size)
 839 {
 840     int16_t *v = pv;
 841     qemu_get_sbe16s(f, v);
 842     return 0;
 843 }
 844
 845 static void put_int16(QEMUFile *f, void *pv, size_t size)
 846 {
 847     int16_t *v = pv;
 848     qemu_put_sbe16s(f, v);
 849 }
 850
 851 const VMStateInfo vmstate_info_int16 = {
 852     .name = "int16",
 853     .get  = get_int16,
 854     .put  = put_int16,
 855 };
 856
 857 /* 32 bit int */
 858
 859 static int get_int32(QEMUFile *f, void *pv, size_t size)
 860 {
 861     int32_t *v = pv;
 862     qemu_get_sbe32s(f, v);
 863     return 0;
 864 }
 865
 866 static void put_int32(QEMUFile *f, void *pv, size_t size)
 867 {
 868     int32_t *v = pv;
 869     qemu_put_sbe32s(f, v);
 870 }
 871
 872 const VMStateInfo vmstate_info_int32 = {
 873     .name = "int32",
 874     .get  = get_int32,
 875     .put  = put_int32,
 876 };
 877
 878 /* 32 bit int. See that the received value is the same than the one
 879    in the field */
 880
 881 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 882 {
 883     int32_t *v = pv;
 884     int32_t v2;
 885     qemu_get_sbe32s(f, &v2);
 886
 887     if (*v == v2)
 888         return 0;
 889     return -EINVAL;
 890 }
 891
 892 const VMStateInfo vmstate_info_int32_equal = {
 893     .name = "int32 equal",
 894     .get  = get_int32_equal,
 895     .put  = put_int32,
 896 };
 897
 898 /* 32 bit int. See that the received value is the less or the same
 899    than the one in the field */
 900
 901 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 902 {
 903     int32_t *old = pv;
 904     int32_t new;
 905     qemu_get_sbe32s(f, &new);
 906
 907     if (*old <= new)
 908         return 0;
 909     return -EINVAL;
 910 }
 911
 912 const VMStateInfo vmstate_info_int32_le = {
 913     .name = "int32 equal",
 914     .get  = get_int32_le,
 915     .put  = put_int32,
 916 };
 917
 918 /* 64 bit int */
 919
 920 static int get_int64(QEMUFile *f, void *pv, size_t size)
 921 {
 922     int64_t *v = pv;
 923     qemu_get_sbe64s(f, v);
 924     return 0;
 925 }
 926
 927 static void put_int64(QEMUFile *f, void *pv, size_t size)
 928 {
 929     int64_t *v = pv;
 930     qemu_put_sbe64s(f, v);
 931 }
 932
 933 const VMStateInfo vmstate_info_int64 = {
 934     .name = "int64",
 935     .get  = get_int64,
 936     .put  = put_int64,
 937 };
 938
 939 /* 8 bit unsigned int */
 940
 941 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 942 {
 943     uint8_t *v = pv;
 944     qemu_get_8s(f, v);
 945     return 0;
 946 }
 947
 948 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 949 {
 950     uint8_t *v = pv;
 951     qemu_put_8s(f, v);
 952 }
 953
 954 const VMStateInfo vmstate_info_uint8 = {
 955     .name = "uint8",
 956     .get  = get_uint8,
 957     .put  = put_uint8,
 958 };
 959
 960 /* 16 bit unsigned int */
 961
 962 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 963 {
 964     uint16_t *v = pv;
 965     qemu_get_be16s(f, v);
 966     return 0;
 967 }
 968
 969 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 970 {
 971     uint16_t *v = pv;
 972     qemu_put_be16s(f, v);
 973 }
 974
 975 const VMStateInfo vmstate_info_uint16 = {
 976     .name = "uint16",
 977     .get  = get_uint16,
 978     .put  = put_uint16,
 979 };
 980
 981 /* 32 bit unsigned int */
 982
 983 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 984 {
 985     uint32_t *v = pv;
 986     qemu_get_be32s(f, v);
 987     return 0;
 988 }
 989
 990 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 991 {
 992     uint32_t *v = pv;
 993     qemu_put_be32s(f, v);
 994 }
 995
 996 const VMStateInfo vmstate_info_uint32 = {
 997     .name = "uint32",
 998     .get  = get_uint32,
 999     .put  = put_uint32,
1000 };
1001
1002 /* 32 bit uint. See that the received value is the same than the one
1003    in the field */
1004
1005 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1006 {
1007     uint32_t *v = pv;
1008     uint32_t v2;
1009     qemu_get_be32s(f, &v2);
1010
1011     if (*v == v2) {
1012         return 0;
1013     }
1014     return -EINVAL;
1015 }
1016
1017 const VMStateInfo vmstate_info_uint32_equal = {
1018     .name = "uint32 equal",
1019     .get  = get_uint32_equal,
1020     .put  = put_uint32,
1021 };
1022
1023 /* 64 bit unsigned int */
1024
1025 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1026 {
1027     uint64_t *v = pv;
1028     qemu_get_be64s(f, v);
1029     return 0;
1030 }
1031
1032 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1033 {
1034     uint64_t *v = pv;
1035     qemu_put_be64s(f, v);
1036 }
1037
1038 const VMStateInfo vmstate_info_uint64 = {
1039     .name = "uint64",
1040     .get  = get_uint64,
1041     .put  = put_uint64,
1042 };
1043
1044 /* 8 bit int. See that the received value is the same than the one
1045    in the field */
1046
1047 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1048 {
1049     uint8_t *v = pv;
1050     uint8_t v2;
1051     qemu_get_8s(f, &v2);
1052
1053     if (*v == v2)
1054         return 0;
1055     return -EINVAL;
1056 }
1057
1058 const VMStateInfo vmstate_info_uint8_equal = {
1059     .name = "uint8 equal",
1060     .get  = get_uint8_equal,
1061     .put  = put_uint8,
1062 };
1063
1064 /* 16 bit unsigned int int. See that the received value is the same than the one
1065    in the field */
1066
1067 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1068 {
1069     uint16_t *v = pv;
1070     uint16_t v2;
1071     qemu_get_be16s(f, &v2);
1072
1073     if (*v == v2)
1074         return 0;
1075     return -EINVAL;
1076 }
1077
1078 const VMStateInfo vmstate_info_uint16_equal = {
1079     .name = "uint16 equal",
1080     .get  = get_uint16_equal,
1081     .put  = put_uint16,
1082 };
1083
1084 /* timers  */
1085
1086 static int get_timer(QEMUFile *f, void *pv, size_t size)
1087 {
1088     QEMUTimer *v = pv;
1089     qemu_get_timer(f, v);
1090     return 0;
1091 }
1092
1093 static void put_timer(QEMUFile *f, void *pv, size_t size)
1094 {
1095     QEMUTimer *v = pv;
1096     qemu_put_timer(f, v);
1097 }
1098
1099 const VMStateInfo vmstate_info_timer = {
1100     .name = "timer",
1101     .get  = get_timer,
1102     .put  = put_timer,
1103 };
1104
1105 /* uint8_t buffers */
1106
1107 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1108 {
1109     uint8_t *v = pv;
1110     qemu_get_buffer(f, v, size);
1111     return 0;
1112 }
1113
1114 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1115 {
1116     uint8_t *v = pv;
1117     qemu_put_buffer(f, v, size);
1118 }
1119
1120 const VMStateInfo vmstate_info_buffer = {
1121     .name = "buffer",
1122     .get  = get_buffer,
1123     .put  = put_buffer,
1124 };
1125
1126 /* unused buffers: space that was used for some fields that are
1127    not useful anymore */
1128
1129 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1130 {
1131     uint8_t buf[1024];
1132     int block_len;
1133
1134     while (size > 0) {
1135         block_len = MIN(sizeof(buf), size);
1136         size -= block_len;
1137         qemu_get_buffer(f, buf, block_len);
1138     }
1139    return 0;
1140 }
1141
1142 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1143 {
1144     static const uint8_t buf[1024];
1145     int block_len;
1146
1147     while (size > 0) {
1148         block_len = MIN(sizeof(buf), size);
1149         size -= block_len;
1150         qemu_put_buffer(f, buf, block_len);
1151     }
1152 }
1153
1154 const VMStateInfo vmstate_info_unused_buffer = {
1155     .name = "unused_buffer",
1156     .get  = get_unused_buffer,
1157     .put  = put_unused_buffer,
1158 };
1159
1160 typedef struct CompatEntry {
1161     char idstr[256];
1162     int instance_id;
1163 } CompatEntry;
1164
1165 typedef struct SaveStateEntry {
1166     QTAILQ_ENTRY(SaveStateEntry) entry;
1167     char idstr[256];
1168     int instance_id;
1169     int alias_id;
1170     int version_id;
1171     int section_id;
1172     SaveSetParamsHandler *set_params;
1173     SaveLiveStateHandler *save_live_state;
1174     SaveStateHandler *save_state;
1175     LoadStateHandler *load_state;
1176     const VMStateDescription *vmsd;
1177     void *opaque;
1178     CompatEntry *compat;
1179     int no_migrate;
1180 } SaveStateEntry;
1181
1182
1183 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1184     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1185 static int global_section_id;
1186
1187 static int calculate_new_instance_id(const char *idstr)
1188 {
1189     SaveStateEntry *se;
1190     int instance_id = 0;
1191
1192     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1193         if (strcmp(idstr, se->idstr) == 0
1194             && instance_id <= se->instance_id) {
1195             instance_id = se->instance_id + 1;
1196         }
1197     }
1198     return instance_id;
1199 }
1200
1201 static int calculate_compat_instance_id(const char *idstr)
1202 {
1203     SaveStateEntry *se;
1204     int instance_id = 0;
1205
1206     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1207         if (!se->compat)
1208             continue;
1209
1210         if (strcmp(idstr, se->compat->idstr) == 0
1211             && instance_id <= se->compat->instance_id) {
1212             instance_id = se->compat->instance_id + 1;
1213         }
1214     }
1215     return instance_id;
1216 }
1217
1218 /* TODO: Individual devices generally have very little idea about the rest
1219    of the system, so instance_id should be removed/replaced.
1220    Meanwhile pass -1 as instance_id if you do not already have a clearly
1221    distinguishing id for all instances of your device class. */
1222 int register_savevm_live(DeviceState *dev,
1223                          const char *idstr,
1224                          int instance_id,
1225                          int version_id,
1226                          SaveSetParamsHandler *set_params,
1227                          SaveLiveStateHandler *save_live_state,
1228                          SaveStateHandler *save_state,
1229                          LoadStateHandler *load_state,
1230                          void *opaque)
1231 {
1232     SaveStateEntry *se;
1233
1234     se = g_malloc0(sizeof(SaveStateEntry));
1235     se->version_id = version_id;
1236     se->section_id = global_section_id++;
1237     se->set_params = set_params;
1238     se->save_live_state = save_live_state;
1239     se->save_state = save_state;
1240     se->load_state = load_state;
1241     se->opaque = opaque;
1242     se->vmsd = NULL;
1243     se->no_migrate = 0;
1244
1245     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1246         char *id = dev->parent_bus->info->get_dev_path(dev);
1247         if (id) {
1248             pstrcpy(se->idstr, sizeof(se->idstr), id);
1249             pstrcat(se->idstr, sizeof(se->idstr), "/");
1250             g_free(id);
1251
1252             se->compat = g_malloc0(sizeof(CompatEntry));
1253             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1254             se->compat->instance_id = instance_id == -1 ?
1255                          calculate_compat_instance_id(idstr) : instance_id;
1256             instance_id = -1;
1257         }
1258     }
1259     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1260
1261     if (instance_id == -1) {
1262         se->instance_id = calculate_new_instance_id(se->idstr);
1263     } else {
1264         se->instance_id = instance_id;
1265     }
1266     assert(!se->compat || se->instance_id == 0);
1267     /* add at the end of list */
1268     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1269     return 0;
1270 }
1271
1272 int register_savevm(DeviceState *dev,
1273                     const char *idstr,
1274                     int instance_id,
1275                     int version_id,
1276                     SaveStateHandler *save_state,
1277                     LoadStateHandler *load_state,
1278                     void *opaque)
1279 {
1280     return register_savevm_live(dev, idstr, instance_id, version_id,
1281                                 NULL, NULL, save_state, load_state, opaque);
1282 }
1283
1284 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1285 {
1286     SaveStateEntry *se, *new_se;
1287     char id[256] = "";
1288
1289     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1290         char *path = dev->parent_bus->info->get_dev_path(dev);
1291         if (path) {
1292             pstrcpy(id, sizeof(id), path);
1293             pstrcat(id, sizeof(id), "/");
1294             g_free(path);
1295         }
1296     }
1297     pstrcat(id, sizeof(id), idstr);
1298
1299     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1300         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1301             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1302             if (se->compat) {
1303                 g_free(se->compat);
1304             }
1305             g_free(se);
1306         }
1307     }
1308 }
1309
1310 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1311                                    const VMStateDescription *vmsd,
1312                                    void *opaque, int alias_id,
1313                                    int required_for_version)
1314 {
1315     SaveStateEntry *se;
1316
1317     /* If this triggers, alias support can be dropped for the vmsd. */
1318     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1319
1320     se = g_malloc0(sizeof(SaveStateEntry));
1321     se->version_id = vmsd->version_id;
1322     se->section_id = global_section_id++;
1323     se->save_live_state = NULL;
1324     se->save_state = NULL;
1325     se->load_state = NULL;
1326     se->opaque = opaque;
1327     se->vmsd = vmsd;
1328     se->alias_id = alias_id;
1329     se->no_migrate = vmsd->unmigratable;
1330
1331     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1332         char *id = dev->parent_bus->info->get_dev_path(dev);
1333         if (id) {
1334             pstrcpy(se->idstr, sizeof(se->idstr), id);
1335             pstrcat(se->idstr, sizeof(se->idstr), "/");
1336             g_free(id);
1337
1338             se->compat = g_malloc0(sizeof(CompatEntry));
1339             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1340             se->compat->instance_id = instance_id == -1 ?
1341                          calculate_compat_instance_id(vmsd->name) : instance_id;
1342             instance_id = -1;
1343         }
1344     }
1345     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1346
1347     if (instance_id == -1) {
1348         se->instance_id = calculate_new_instance_id(se->idstr);
1349     } else {
1350         se->instance_id = instance_id;
1351     }
1352     assert(!se->compat || se->instance_id == 0);
1353     /* add at the end of list */
1354     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1355     return 0;
1356 }
1357
1358 int vmstate_register(DeviceState *dev, int instance_id,
1359                      const VMStateDescription *vmsd, void *opaque)
1360 {
1361     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1362                                           opaque, -1, 0);
1363 }
1364
1365 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1366                         void *opaque)
1367 {
1368     SaveStateEntry *se, *new_se;
1369
1370     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1371         if (se->vmsd == vmsd && se->opaque == opaque) {
1372             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1373             if (se->compat) {
1374                 g_free(se->compat);
1375             }
1376             g_free(se);
1377         }
1378     }
1379 }
1380
1381 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1382                                     void *opaque);
1383 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1384                                    void *opaque);
1385
1386 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1387                        void *opaque, int version_id)
1388 {
1389     VMStateField *field = vmsd->fields;
1390     int ret;
1391
1392     if (version_id > vmsd->version_id) {
1393         return -EINVAL;
1394     }
1395     if (version_id < vmsd->minimum_version_id_old) {
1396         return -EINVAL;
1397     }
1398     if  (version_id < vmsd->minimum_version_id) {
1399         return vmsd->load_state_old(f, opaque, version_id);
1400     }
1401     if (vmsd->pre_load) {
1402         int ret = vmsd->pre_load(opaque);
1403         if (ret)
1404             return ret;
1405     }
1406     while(field->name) {
1407         if ((field->field_exists &&
1408              field->field_exists(opaque, version_id)) ||
1409             (!field->field_exists &&
1410              field->version_id <= version_id)) {
1411             void *base_addr = opaque + field->offset;
1412             int i, n_elems = 1;
1413             int size = field->size;
1414
1415             if (field->flags & VMS_VBUFFER) {
1416                 size = *(int32_t *)(opaque+field->size_offset);
1417                 if (field->flags & VMS_MULTIPLY) {
1418                     size *= field->size;
1419                 }
1420             }
1421             if (field->flags & VMS_ARRAY) {
1422                 n_elems = field->num;
1423             } else if (field->flags & VMS_VARRAY_INT32) {
1424                 n_elems = *(int32_t *)(opaque+field->num_offset);
1425             } else if (field->flags & VMS_VARRAY_UINT32) {
1426                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1427             } else if (field->flags & VMS_VARRAY_UINT16) {
1428                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1429             } else if (field->flags & VMS_VARRAY_UINT8) {
1430                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1431             }
1432             if (field->flags & VMS_POINTER) {
1433                 base_addr = *(void **)base_addr + field->start;
1434             }
1435             for (i = 0; i < n_elems; i++) {
1436                 void *addr = base_addr + size * i;
1437
1438                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1439                     addr = *(void **)addr;
1440                 }
1441                 if (field->flags & VMS_STRUCT) {
1442                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1443                 } else {
1444                     ret = field->info->get(f, addr, size);
1445
1446                 }
1447                 if (ret < 0) {
1448                     return ret;
1449                 }
1450             }
1451         }
1452         field++;
1453     }
1454     ret = vmstate_subsection_load(f, vmsd, opaque);
1455     if (ret != 0) {
1456         return ret;
1457     }
1458     if (vmsd->post_load) {
1459         return vmsd->post_load(opaque, version_id);
1460     }
1461     return 0;
1462 }
1463
1464 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1465                         void *opaque)
1466 {
1467     VMStateField *field = vmsd->fields;
1468
1469     if (vmsd->pre_save) {
1470         vmsd->pre_save(opaque);
1471     }
1472     while(field->name) {
1473         if (!field->field_exists ||
1474             field->field_exists(opaque, vmsd->version_id)) {
1475             void *base_addr = opaque + field->offset;
1476             int i, n_elems = 1;
1477             int size = field->size;
1478
1479             if (field->flags & VMS_VBUFFER) {
1480                 size = *(int32_t *)(opaque+field->size_offset);
1481                 if (field->flags & VMS_MULTIPLY) {
1482                     size *= field->size;
1483                 }
1484             }
1485             if (field->flags & VMS_ARRAY) {
1486                 n_elems = field->num;
1487             } else if (field->flags & VMS_VARRAY_INT32) {
1488                 n_elems = *(int32_t *)(opaque+field->num_offset);
1489             } else if (field->flags & VMS_VARRAY_UINT16) {
1490                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1491             } else if (field->flags & VMS_VARRAY_UINT8) {
1492                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1493             }
1494             if (field->flags & VMS_POINTER) {
1495                 base_addr = *(void **)base_addr + field->start;
1496             }
1497             for (i = 0; i < n_elems; i++) {
1498                 void *addr = base_addr + size * i;
1499
1500                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1501                     addr = *(void **)addr;
1502                 }
1503                 if (field->flags & VMS_STRUCT) {
1504                     vmstate_save_state(f, field->vmsd, addr);
1505                 } else {
1506                     field->info->put(f, addr, size);
1507                 }
1508             }
1509         }
1510         field++;
1511     }
1512     vmstate_subsection_save(f, vmsd, opaque);
1513 }
1514
1515 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1516 {
1517     if (!se->vmsd) {         /* Old style */
1518         return se->load_state(f, se->opaque, version_id);
1519     }
1520     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1521 }
1522
1523 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1524 {
1525     if (!se->vmsd) {         /* Old style */
1526         se->save_state(f, se->opaque);
1527         return;
1528     }
1529     vmstate_save_state(f,se->vmsd, se->opaque);
1530 }
1531
1532 #define QEMU_VM_FILE_MAGIC           0x5145564d
1533 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1534 #define QEMU_VM_FILE_VERSION         0x00000003
1535
1536 #define QEMU_VM_EOF                  0x00
1537 #define QEMU_VM_SECTION_START        0x01
1538 #define QEMU_VM_SECTION_PART         0x02
1539 #define QEMU_VM_SECTION_END          0x03
1540 #define QEMU_VM_SECTION_FULL         0x04
1541 #define QEMU_VM_SUBSECTION           0x05
1542
1543 bool qemu_savevm_state_blocked(Monitor *mon)
1544 {
1545     SaveStateEntry *se;
1546
1547     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1548         if (se->no_migrate) {
1549             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1550                            se->idstr);
1551             return true;
1552         }
1553     }
1554     return false;
1555 }
1556
1557 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1558                             int shared)
1559 {
1560     SaveStateEntry *se;
1561     int ret;
1562
1563     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1564         if(se->set_params == NULL) {
1565             continue;
1566         }
1567         se->set_params(blk_enable, shared, se->opaque);
1568     }
1569
1570     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1571     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1572
1573     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1574         int len;
1575
1576         if (se->save_live_state == NULL)
1577             continue;
1578
1579         /* Section type */
1580         qemu_put_byte(f, QEMU_VM_SECTION_START);
1581         qemu_put_be32(f, se->section_id);
1582
1583         /* ID string */
1584         len = strlen(se->idstr);
1585         qemu_put_byte(f, len);
1586         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1587
1588         qemu_put_be32(f, se->instance_id);
1589         qemu_put_be32(f, se->version_id);
1590
1591         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1592         if (ret < 0) {
1593             qemu_savevm_state_cancel(mon, f);
1594             return ret;
1595         }
1596     }
1597     ret = qemu_file_get_error(f);
1598     if (ret != 0) {
1599         qemu_savevm_state_cancel(mon, f);
1600     }
1601
1602     return ret;
1603
1604 }
1605
1606 /*
1607  * this function has three return values:
1608  *   negative: there was one error, and we have -errno.
1609  *   0 : We haven't finished, caller have to go again
1610  *   1 : We have finished, we can go to complete phase
1611  */
1612 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1613 {
1614     SaveStateEntry *se;
1615     int ret = 1;
1616
1617     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1618         if (se->save_live_state == NULL)
1619             continue;
1620
1621         /* Section type */
1622         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1623         qemu_put_be32(f, se->section_id);
1624
1625         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1626         if (ret <= 0) {
1627             /* Do not proceed to the next vmstate before this one reported
1628                completion of the current stage. This serializes the migration
1629                and reduces the probability that a faster changing state is
1630                synchronized over and over again. */
1631             break;
1632         }
1633     }
1634     if (ret != 0) {
1635         return ret;
1636     }
1637     ret = qemu_file_get_error(f);
1638     if (ret != 0) {
1639         qemu_savevm_state_cancel(mon, f);
1640     }
1641     return ret;
1642 }
1643
1644 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1645 {
1646     SaveStateEntry *se;
1647     int ret;
1648
1649     cpu_synchronize_all_states();
1650
1651     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1652         if (se->save_live_state == NULL)
1653             continue;
1654
1655         /* Section type */
1656         qemu_put_byte(f, QEMU_VM_SECTION_END);
1657         qemu_put_be32(f, se->section_id);
1658
1659         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1660         if (ret < 0) {
1661             return ret;
1662         }
1663     }
1664
1665     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1666         int len;
1667
1668         if (se->save_state == NULL && se->vmsd == NULL)
1669             continue;
1670
1671         /* Section type */
1672         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1673         qemu_put_be32(f, se->section_id);
1674
1675         /* ID string */
1676         len = strlen(se->idstr);
1677         qemu_put_byte(f, len);
1678         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1679
1680         qemu_put_be32(f, se->instance_id);
1681         qemu_put_be32(f, se->version_id);
1682
1683         vmstate_save(f, se);
1684     }
1685
1686     qemu_put_byte(f, QEMU_VM_EOF);
1687
1688     return qemu_file_get_error(f);
1689 }
1690
1691 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1692 {
1693     SaveStateEntry *se;
1694
1695     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1696         if (se->save_live_state) {
1697             se->save_live_state(mon, f, -1, se->opaque);
1698         }
1699     }
1700 }
1701
1702 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1703 {
1704     int ret;
1705
1706     if (qemu_savevm_state_blocked(mon)) {
1707         ret = -EINVAL;
1708         goto out;
1709     }
1710
1711     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1712     if (ret < 0)
1713         goto out;
1714
1715     do {
1716         ret = qemu_savevm_state_iterate(mon, f);
1717         if (ret < 0)
1718             goto out;
1719     } while (ret == 0);
1720
1721     ret = qemu_savevm_state_complete(mon, f);
1722
1723 out:
1724     if (ret == 0) {
1725         ret = qemu_file_get_error(f);
1726     }
1727
1728     return ret;
1729 }
1730
1731 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1732 {
1733     SaveStateEntry *se;
1734
1735     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1736         if (!strcmp(se->idstr, idstr) &&
1737             (instance_id == se->instance_id ||
1738              instance_id == se->alias_id))
1739             return se;
1740         /* Migrating from an older version? */
1741         if (strstr(se->idstr, idstr) && se->compat) {
1742             if (!strcmp(se->compat->idstr, idstr) &&
1743                 (instance_id == se->compat->instance_id ||
1744                  instance_id == se->alias_id))
1745                 return se;
1746         }
1747     }
1748     return NULL;
1749 }
1750
1751 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1752 {
1753     while(sub && sub->needed) {
1754         if (strcmp(idstr, sub->vmsd->name) == 0) {
1755             return sub->vmsd;
1756         }
1757         sub++;
1758     }
1759     return NULL;
1760 }
1761
1762 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1763                                    void *opaque)
1764 {
1765     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1766         char idstr[256];
1767         int ret;
1768         uint8_t version_id, len, size;
1769         const VMStateDescription *sub_vmsd;
1770
1771         len = qemu_peek_byte(f, 1);
1772         if (len < strlen(vmsd->name) + 1) {
1773             /* subsection name has be be "section_name/a" */
1774             return 0;
1775         }
1776         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1777         if (size != len) {
1778             return 0;
1779         }
1780         idstr[size] = 0;
1781
1782         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1783             /* it don't have a valid subsection name */
1784             return 0;
1785         }
1786         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1787         if (sub_vmsd == NULL) {
1788             return -ENOENT;
1789         }
1790         qemu_file_skip(f, 1); /* subsection */
1791         qemu_file_skip(f, 1); /* len */
1792         qemu_file_skip(f, len); /* idstr */
1793         version_id = qemu_get_be32(f);
1794
1795         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1796         if (ret) {
1797             return ret;
1798         }
1799     }
1800     return 0;
1801 }
1802
1803 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1804                                     void *opaque)
1805 {
1806     const VMStateSubsection *sub = vmsd->subsections;
1807
1808     while (sub && sub->needed) {
1809         if (sub->needed(opaque)) {
1810             const VMStateDescription *vmsd = sub->vmsd;
1811             uint8_t len;
1812
1813             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1814             len = strlen(vmsd->name);
1815             qemu_put_byte(f, len);
1816             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1817             qemu_put_be32(f, vmsd->version_id);
1818             vmstate_save_state(f, vmsd, opaque);
1819         }
1820         sub++;
1821     }
1822 }
1823
1824 typedef struct LoadStateEntry {
1825     QLIST_ENTRY(LoadStateEntry) entry;
1826     SaveStateEntry *se;
1827     int section_id;
1828     int version_id;
1829 } LoadStateEntry;
1830
1831 int qemu_loadvm_state(QEMUFile *f)
1832 {
1833     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1834         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1835     LoadStateEntry *le, *new_le;
1836     uint8_t section_type;
1837     unsigned int v;
1838     int ret;
1839
1840     if (qemu_savevm_state_blocked(default_mon)) {
1841         return -EINVAL;
1842     }
1843
1844     v = qemu_get_be32(f);
1845     if (v != QEMU_VM_FILE_MAGIC)
1846         return -EINVAL;
1847
1848     v = qemu_get_be32(f);
1849     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1850         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1851         return -ENOTSUP;
1852     }
1853     if (v != QEMU_VM_FILE_VERSION)
1854         return -ENOTSUP;
1855
1856     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1857         uint32_t instance_id, version_id, section_id;
1858         SaveStateEntry *se;
1859         char idstr[257];
1860         int len;
1861
1862         switch (section_type) {
1863         case QEMU_VM_SECTION_START:
1864         case QEMU_VM_SECTION_FULL:
1865             /* Read section start */
1866             section_id = qemu_get_be32(f);
1867             len = qemu_get_byte(f);
1868             qemu_get_buffer(f, (uint8_t *)idstr, len);
1869             idstr[len] = 0;
1870             instance_id = qemu_get_be32(f);
1871             version_id = qemu_get_be32(f);
1872
1873             /* Find savevm section */
1874             se = find_se(idstr, instance_id);
1875             if (se == NULL) {
1876                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1877                 ret = -EINVAL;
1878                 goto out;
1879             }
1880
1881             /* Validate version */
1882             if (version_id > se->version_id) {
1883                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1884                         version_id, idstr, se->version_id);
1885                 ret = -EINVAL;
1886                 goto out;
1887             }
1888
1889             /* Add entry */
1890             le = g_malloc0(sizeof(*le));
1891
1892             le->se = se;
1893             le->section_id = section_id;
1894             le->version_id = version_id;
1895             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1896
1897             ret = vmstate_load(f, le->se, le->version_id);
1898             if (ret < 0) {
1899                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1900                         instance_id, idstr);
1901                 goto out;
1902             }
1903             break;
1904         case QEMU_VM_SECTION_PART:
1905         case QEMU_VM_SECTION_END:
1906             section_id = qemu_get_be32(f);
1907
1908             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1909                 if (le->section_id == section_id) {
1910                     break;
1911                 }
1912             }
1913             if (le == NULL) {
1914                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1915                 ret = -EINVAL;
1916                 goto out;
1917             }
1918
1919             ret = vmstate_load(f, le->se, le->version_id);
1920             if (ret < 0) {
1921                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1922                         section_id);
1923                 goto out;
1924             }
1925             break;
1926         default:
1927             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1928             ret = -EINVAL;
1929             goto out;
1930         }
1931     }
1932
1933     cpu_synchronize_all_post_init();
1934
1935     ret = 0;
1936
1937 out:
1938     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1939         QLIST_REMOVE(le, entry);
1940         g_free(le);
1941     }
1942
1943     if (ret == 0) {
1944         ret = qemu_file_get_error(f);
1945     }
1946
1947     return ret;
1948 }
1949
1950 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1951                               const char *name)
1952 {
1953     QEMUSnapshotInfo *sn_tab, *sn;
1954     int nb_sns, i, ret;
1955
1956     ret = -ENOENT;
1957     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1958     if (nb_sns < 0)
1959         return ret;
1960     for(i = 0; i < nb_sns; i++) {
1961         sn = &sn_tab[i];
1962         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1963             *sn_info = *sn;
1964             ret = 0;
1965             break;
1966         }
1967     }
1968     g_free(sn_tab);
1969     return ret;
1970 }
1971
1972 /*
1973  * Deletes snapshots of a given name in all opened images.
1974  */
1975 static int del_existing_snapshots(Monitor *mon, const char *name)
1976 {
1977     BlockDriverState *bs;
1978     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1979     int ret;
1980
1981     bs = NULL;
1982     while ((bs = bdrv_next(bs))) {
1983         if (bdrv_can_snapshot(bs) &&
1984             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1985         {
1986             ret = bdrv_snapshot_delete(bs, name);
1987             if (ret < 0) {
1988                 monitor_printf(mon,
1989                                "Error while deleting snapshot on '%s'\n",
1990                                bdrv_get_device_name(bs));
1991                 return -1;
1992             }
1993         }
1994     }
1995
1996     return 0;
1997 }
1998
1999 void do_savevm(Monitor *mon, const QDict *qdict)
2000 {
2001     BlockDriverState *bs, *bs1;
2002     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2003     int ret;
2004     QEMUFile *f;
2005     int saved_vm_running;
2006     uint64_t vm_state_size;
2007 #ifdef _WIN32
2008     struct _timeb tb;
2009     struct tm *ptm;
2010 #else
2011     struct timeval tv;
2012     struct tm tm;
2013 #endif
2014     const char *name = qdict_get_try_str(qdict, "name");
2015
2016     /* Verify if there is a device that doesn't support snapshots and is writable */
2017     bs = NULL;
2018     while ((bs = bdrv_next(bs))) {
2019
2020         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2021             continue;
2022         }
2023
2024         if (!bdrv_can_snapshot(bs)) {
2025             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2026                                bdrv_get_device_name(bs));
2027             return;
2028         }
2029     }
2030
2031     bs = bdrv_snapshots();
2032     if (!bs) {
2033         monitor_printf(mon, "No block device can accept snapshots\n");
2034         return;
2035     }
2036
2037     saved_vm_running = runstate_is_running();
2038     vm_stop(RUN_STATE_SAVE_VM);
2039
2040     memset(sn, 0, sizeof(*sn));
2041
2042     /* fill auxiliary fields */
2043 #ifdef _WIN32
2044     _ftime(&tb);
2045     sn->date_sec = tb.time;
2046     sn->date_nsec = tb.millitm * 1000000;
2047 #else
2048     gettimeofday(&tv, NULL);
2049     sn->date_sec = tv.tv_sec;
2050     sn->date_nsec = tv.tv_usec * 1000;
2051 #endif
2052     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2053
2054     if (name) {
2055         ret = bdrv_snapshot_find(bs, old_sn, name);
2056         if (ret >= 0) {
2057             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2058             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2059         } else {
2060             pstrcpy(sn->name, sizeof(sn->name), name);
2061         }
2062     } else {
2063 #ifdef _WIN32
2064         ptm = localtime(&tb.time);
2065         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2066 #else
2067         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2068         localtime_r((const time_t *)&tv.tv_sec, &tm);
2069         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2070 #endif
2071     }
2072
2073     /* Delete old snapshots of the same name */
2074     if (name && del_existing_snapshots(mon, name) < 0) {
2075         goto the_end;
2076     }
2077
2078     /* save the VM state */
2079     f = qemu_fopen_bdrv(bs, 1);
2080     if (!f) {
2081         monitor_printf(mon, "Could not open VM state file\n");
2082         goto the_end;
2083     }
2084     ret = qemu_savevm_state(mon, f);
2085     vm_state_size = qemu_ftell(f);
2086     qemu_fclose(f);
2087     if (ret < 0) {
2088         monitor_printf(mon, "Error %d while writing VM\n", ret);
2089         goto the_end;
2090     }
2091
2092     /* create the snapshots */
2093
2094     bs1 = NULL;
2095     while ((bs1 = bdrv_next(bs1))) {
2096         if (bdrv_can_snapshot(bs1)) {
2097             /* Write VM state size only to the image that contains the state */
2098             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2099             ret = bdrv_snapshot_create(bs1, sn);
2100             if (ret < 0) {
2101                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2102                                bdrv_get_device_name(bs1));
2103             }
2104         }
2105     }
2106
2107  the_end:
2108     if (saved_vm_running)
2109         vm_start();
2110 }
2111
2112 int load_vmstate(const char *name)
2113 {
2114     BlockDriverState *bs, *bs_vm_state;
2115     QEMUSnapshotInfo sn;
2116     QEMUFile *f;
2117     int ret;
2118
2119     bs_vm_state = bdrv_snapshots();
2120     if (!bs_vm_state) {
2121         error_report("No block device supports snapshots");
2122         return -ENOTSUP;
2123     }
2124
2125     /* Don't even try to load empty VM states */
2126     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2127     if (ret < 0) {
2128         return ret;
2129     } else if (sn.vm_state_size == 0) {
2130         error_report("This is a disk-only snapshot. Revert to it offline "
2131             "using qemu-img.");
2132         return -EINVAL;
2133     }
2134
2135     /* Verify if there is any device that doesn't support snapshots and is
2136     writable and check if the requested snapshot is available too. */
2137     bs = NULL;
2138     while ((bs = bdrv_next(bs))) {
2139
2140         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2141             continue;
2142         }
2143
2144         if (!bdrv_can_snapshot(bs)) {
2145             error_report("Device '%s' is writable but does not support snapshots.",
2146                                bdrv_get_device_name(bs));
2147             return -ENOTSUP;
2148         }
2149
2150         ret = bdrv_snapshot_find(bs, &sn, name);
2151         if (ret < 0) {
2152             error_report("Device '%s' does not have the requested snapshot '%s'",
2153                            bdrv_get_device_name(bs), name);
2154             return ret;
2155         }
2156     }
2157
2158     /* Flush all IO requests so they don't interfere with the new state.  */
2159     bdrv_drain_all();
2160
2161     bs = NULL;
2162     while ((bs = bdrv_next(bs))) {
2163         if (bdrv_can_snapshot(bs)) {
2164             ret = bdrv_snapshot_goto(bs, name);
2165             if (ret < 0) {
2166                 error_report("Error %d while activating snapshot '%s' on '%s'",
2167                              ret, name, bdrv_get_device_name(bs));
2168                 return ret;
2169             }
2170         }
2171     }
2172
2173     /* restore the VM state */
2174     f = qemu_fopen_bdrv(bs_vm_state, 0);
2175     if (!f) {
2176         error_report("Could not open VM state file");
2177         return -EINVAL;
2178     }
2179
2180     qemu_system_reset(VMRESET_SILENT);
2181     ret = qemu_loadvm_state(f);
2182
2183     qemu_fclose(f);
2184     if (ret < 0) {
2185         error_report("Error %d while loading VM state", ret);
2186         return ret;
2187     }
2188
2189     return 0;
2190 }
2191
2192 void do_delvm(Monitor *mon, const QDict *qdict)
2193 {
2194     BlockDriverState *bs, *bs1;
2195     int ret;
2196     const char *name = qdict_get_str(qdict, "name");
2197
2198     bs = bdrv_snapshots();
2199     if (!bs) {
2200         monitor_printf(mon, "No block device supports snapshots\n");
2201         return;
2202     }
2203
2204     bs1 = NULL;
2205     while ((bs1 = bdrv_next(bs1))) {
2206         if (bdrv_can_snapshot(bs1)) {
2207             ret = bdrv_snapshot_delete(bs1, name);
2208             if (ret < 0) {
2209                 if (ret == -ENOTSUP)
2210                     monitor_printf(mon,
2211                                    "Snapshots not supported on device '%s'\n",
2212                                    bdrv_get_device_name(bs1));
2213                 else
2214                     monitor_printf(mon, "Error %d while deleting snapshot on "
2215                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2216             }
2217         }
2218     }
2219 }
2220
2221 void do_info_snapshots(Monitor *mon)
2222 {
2223     BlockDriverState *bs, *bs1;
2224     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2225     int nb_sns, i, ret, available;
2226     int total;
2227     int *available_snapshots;
2228     char buf[256];
2229
2230     bs = bdrv_snapshots();
2231     if (!bs) {
2232         monitor_printf(mon, "No available block device supports snapshots\n");
2233         return;
2234     }
2235
2236     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2237     if (nb_sns < 0) {
2238         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2239         return;
2240     }
2241
2242     if (nb_sns == 0) {
2243         monitor_printf(mon, "There is no snapshot available.\n");
2244         return;
2245     }
2246
2247     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2248     total = 0;
2249     for (i = 0; i < nb_sns; i++) {
2250         sn = &sn_tab[i];
2251         available = 1;
2252         bs1 = NULL;
2253
2254         while ((bs1 = bdrv_next(bs1))) {
2255             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2256                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2257                 if (ret < 0) {
2258                     available = 0;
2259                     break;
2260                 }
2261             }
2262         }
2263
2264         if (available) {
2265             available_snapshots[total] = i;
2266             total++;
2267         }
2268     }
2269
2270     if (total > 0) {
2271         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2272         for (i = 0; i < total; i++) {
2273             sn = &sn_tab[available_snapshots[i]];
2274             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2275         }
2276     } else {
2277         monitor_printf(mon, "There is no suitable snapshot available\n");
2278     }
2279
2280     g_free(sn_tab);
2281     g_free(available_snapshots);
2282
2283 }
2284
2285 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2286 {
2287     qemu_ram_set_idstr(memory_region_get_ram_addr(mr),
2288                        memory_region_name(mr), dev);
2289 }
2290
2291 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2292 {
2293     /* Nothing do to while the implementation is in RAMBlock */
2294 }
2295
2296 void vmstate_register_ram_global(MemoryRegion *mr)
2297 {
2298     vmstate_register_ram(mr, NULL);
2299 }