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 "cpus.h"
  85
  86 #define SELF_ANNOUNCE_ROUNDS 5
  87
  88 #ifndef ETH_P_RARP
  89 #define ETH_P_RARP 0x8035
  90 #endif
  91 #define ARP_HTYPE_ETH 0x0001
  92 #define ARP_PTYPE_IP 0x0800
  93 #define ARP_OP_REQUEST_REV 0x3
  94
  95 static int announce_self_create(uint8_t *buf,
  96                                 uint8_t *mac_addr)
  97 {
  98     /* Ethernet header. */
  99     memset(buf, 0xff, 6);         /* destination MAC addr */
 100     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 101     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 102
 103     /* RARP header. */
 104     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 105     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 106     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 107     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 108     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 109     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 110     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 111     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 112     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 113
 114     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 115     memset(buf + 42, 0x00, 18);
 116
 117     return 60; /* len (FCS will be added by hardware) */
 118 }
 119
 120 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 121 {
 122     uint8_t buf[60];
 123     int len;
 124
 125     len = announce_self_create(buf, nic->conf->macaddr.a);
 126
 127     qemu_send_packet_raw(&nic->nc, buf, len);
 128 }
 129
 130
 131 static void qemu_announce_self_once(void *opaque)
 132 {
 133     static int count = SELF_ANNOUNCE_ROUNDS;
 134     QEMUTimer *timer = *(QEMUTimer **)opaque;
 135
 136     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 137
 138     if (--count) {
 139         /* delay 50ms, 150ms, 250ms, ... */
 140         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 141                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 142     } else {
 143             qemu_del_timer(timer);
 144             qemu_free_timer(timer);
 145     }
 146 }
 147
 148 void qemu_announce_self(void)
 149 {
 150         static QEMUTimer *timer;
 151         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 152         qemu_announce_self_once(&timer);
 153 }
 154
 155 /***********************************************************/
 156 /* savevm/loadvm support */
 157
 158 #define IO_BUF_SIZE 32768
 159
 160 struct QEMUFile {
 161     QEMUFilePutBufferFunc *put_buffer;
 162     QEMUFileGetBufferFunc *get_buffer;
 163     QEMUFileCloseFunc *close;
 164     QEMUFileRateLimit *rate_limit;
 165     QEMUFileSetRateLimit *set_rate_limit;
 166     QEMUFileGetRateLimit *get_rate_limit;
 167     void *opaque;
 168     int is_write;
 169
 170     int64_t buf_offset; /* start of buffer when writing, end of buffer
 171                            when reading */
 172     int buf_index;
 173     int buf_size; /* 0 when writing */
 174     uint8_t buf[IO_BUF_SIZE];
 175
 176     int has_error;
 177 };
 178
 179 typedef struct QEMUFileStdio
 180 {
 181     FILE *stdio_file;
 182     QEMUFile *file;
 183 } QEMUFileStdio;
 184
 185 typedef struct QEMUFileSocket
 186 {
 187     int fd;
 188     QEMUFile *file;
 189 } QEMUFileSocket;
 190
 191 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 192 {
 193     QEMUFileSocket *s = opaque;
 194     ssize_t len;
 195
 196     do {
 197         len = qemu_recv(s->fd, buf, size, 0);
 198     } while (len == -1 && socket_error() == EINTR);
 199
 200     if (len == -1)
 201         len = -socket_error();
 202
 203     return len;
 204 }
 205
 206 static int socket_close(void *opaque)
 207 {
 208     QEMUFileSocket *s = opaque;
 209     g_free(s);
 210     return 0;
 211 }
 212
 213 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 214 {
 215     QEMUFileStdio *s = opaque;
 216     return fwrite(buf, 1, size, s->stdio_file);
 217 }
 218
 219 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 220 {
 221     QEMUFileStdio *s = opaque;
 222     FILE *fp = s->stdio_file;
 223     int bytes;
 224
 225     do {
 226         clearerr(fp);
 227         bytes = fread(buf, 1, size, fp);
 228     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 229     return bytes;
 230 }
 231
 232 static int stdio_pclose(void *opaque)
 233 {
 234     QEMUFileStdio *s = opaque;
 235     int ret;
 236     ret = pclose(s->stdio_file);
 237     g_free(s);
 238     return ret;
 239 }
 240
 241 static int stdio_fclose(void *opaque)
 242 {
 243     QEMUFileStdio *s = opaque;
 244     fclose(s->stdio_file);
 245     g_free(s);
 246     return 0;
 247 }
 248
 249 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 250 {
 251     QEMUFileStdio *s;
 252
 253     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 254         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 255         return NULL;
 256     }
 257
 258     s = g_malloc0(sizeof(QEMUFileStdio));
 259
 260     s->stdio_file = stdio_file;
 261
 262     if(mode[0] == 'r') {
 263         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 264                                  NULL, NULL, NULL);
 265     } else {
 266         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 267                                  NULL, NULL, NULL);
 268     }
 269     return s->file;
 270 }
 271
 272 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 273 {
 274     FILE *popen_file;
 275
 276     popen_file = popen(command, mode);
 277     if(popen_file == NULL) {
 278         return NULL;
 279     }
 280
 281     return qemu_popen(popen_file, mode);
 282 }
 283
 284 int qemu_stdio_fd(QEMUFile *f)
 285 {
 286     QEMUFileStdio *p;
 287     int fd;
 288
 289     p = (QEMUFileStdio *)f->opaque;
 290     fd = fileno(p->stdio_file);
 291
 292     return fd;
 293 }
 294
 295 QEMUFile *qemu_fdopen(int fd, const char *mode)
 296 {
 297     QEMUFileStdio *s;
 298
 299     if (mode == NULL ||
 300         (mode[0] != 'r' && mode[0] != 'w') ||
 301         mode[1] != 'b' || mode[2] != 0) {
 302         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 303         return NULL;
 304     }
 305
 306     s = g_malloc0(sizeof(QEMUFileStdio));
 307     s->stdio_file = fdopen(fd, mode);
 308     if (!s->stdio_file)
 309         goto fail;
 310
 311     if(mode[0] == 'r') {
 312         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 313                                  NULL, NULL, NULL);
 314     } else {
 315         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 316                                  NULL, NULL, NULL);
 317     }
 318     return s->file;
 319
 320 fail:
 321     g_free(s);
 322     return NULL;
 323 }
 324
 325 QEMUFile *qemu_fopen_socket(int fd)
 326 {
 327     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 328
 329     s->fd = fd;
 330     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 331                              NULL, NULL, NULL);
 332     return s->file;
 333 }
 334
 335 static int file_put_buffer(void *opaque, const uint8_t *buf,
 336                             int64_t pos, int size)
 337 {
 338     QEMUFileStdio *s = opaque;
 339     fseek(s->stdio_file, pos, SEEK_SET);
 340     return fwrite(buf, 1, size, s->stdio_file);
 341 }
 342
 343 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 344 {
 345     QEMUFileStdio *s = opaque;
 346     fseek(s->stdio_file, pos, SEEK_SET);
 347     return fread(buf, 1, size, s->stdio_file);
 348 }
 349
 350 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 351 {
 352     QEMUFileStdio *s;
 353
 354     if (mode == NULL ||
 355         (mode[0] != 'r' && mode[0] != 'w') ||
 356         mode[1] != 'b' || mode[2] != 0) {
 357         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 358         return NULL;
 359     }
 360
 361     s = g_malloc0(sizeof(QEMUFileStdio));
 362
 363     s->stdio_file = fopen(filename, mode);
 364     if (!s->stdio_file)
 365         goto fail;
 366
 367     if(mode[0] == 'w') {
 368         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 369                                  NULL, NULL, NULL);
 370     } else {
 371         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 372                                NULL, NULL, NULL);
 373     }
 374     return s->file;
 375 fail:
 376     g_free(s);
 377     return NULL;
 378 }
 379
 380 static int block_put_buffer(void *opaque, const uint8_t *buf,
 381                            int64_t pos, int size)
 382 {
 383     bdrv_save_vmstate(opaque, buf, pos, size);
 384     return size;
 385 }
 386
 387 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 388 {
 389     return bdrv_load_vmstate(opaque, buf, pos, size);
 390 }
 391
 392 static int bdrv_fclose(void *opaque)
 393 {
 394     return 0;
 395 }
 396
 397 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 398 {
 399     if (is_writable)
 400         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 401                               NULL, NULL, NULL);
 402     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 403 }
 404
 405 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 406                          QEMUFileGetBufferFunc *get_buffer,
 407                          QEMUFileCloseFunc *close,
 408                          QEMUFileRateLimit *rate_limit,
 409                          QEMUFileSetRateLimit *set_rate_limit,
 410                          QEMUFileGetRateLimit *get_rate_limit)
 411 {
 412     QEMUFile *f;
 413
 414     f = g_malloc0(sizeof(QEMUFile));
 415
 416     f->opaque = opaque;
 417     f->put_buffer = put_buffer;
 418     f->get_buffer = get_buffer;
 419     f->close = close;
 420     f->rate_limit = rate_limit;
 421     f->set_rate_limit = set_rate_limit;
 422     f->get_rate_limit = get_rate_limit;
 423     f->is_write = 0;
 424
 425     return f;
 426 }
 427
 428 int qemu_file_has_error(QEMUFile *f)
 429 {
 430     return f->has_error;
 431 }
 432
 433 void qemu_file_set_error(QEMUFile *f)
 434 {
 435     f->has_error = 1;
 436 }
 437
 438 void qemu_fflush(QEMUFile *f)
 439 {
 440     if (!f->put_buffer)
 441         return;
 442
 443     if (f->is_write && f->buf_index > 0) {
 444         int len;
 445
 446         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 447         if (len > 0)
 448             f->buf_offset += f->buf_index;
 449         else
 450             f->has_error = 1;
 451         f->buf_index = 0;
 452     }
 453 }
 454
 455 static void qemu_fill_buffer(QEMUFile *f)
 456 {
 457     int len;
 458
 459     if (!f->get_buffer)
 460         return;
 461
 462     if (f->is_write)
 463         abort();
 464
 465     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 466     if (len > 0) {
 467         f->buf_index = 0;
 468         f->buf_size = len;
 469         f->buf_offset += len;
 470     } else if (len != -EAGAIN)
 471         f->has_error = 1;
 472 }
 473
 474 int qemu_fclose(QEMUFile *f)
 475 {
 476     int ret = 0;
 477     qemu_fflush(f);
 478     if (f->close)
 479         ret = f->close(f->opaque);
 480     g_free(f);
 481     return ret;
 482 }
 483
 484 void qemu_file_put_notify(QEMUFile *f)
 485 {
 486     f->put_buffer(f->opaque, NULL, 0, 0);
 487 }
 488
 489 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 490 {
 491     int l;
 492
 493     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 494         fprintf(stderr,
 495                 "Attempted to write to buffer while read buffer is not empty\n");
 496         abort();
 497     }
 498
 499     while (!f->has_error && size > 0) {
 500         l = IO_BUF_SIZE - f->buf_index;
 501         if (l > size)
 502             l = size;
 503         memcpy(f->buf + f->buf_index, buf, l);
 504         f->is_write = 1;
 505         f->buf_index += l;
 506         buf += l;
 507         size -= l;
 508         if (f->buf_index >= IO_BUF_SIZE)
 509             qemu_fflush(f);
 510     }
 511 }
 512
 513 void qemu_put_byte(QEMUFile *f, int v)
 514 {
 515     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 516         fprintf(stderr,
 517                 "Attempted to write to buffer while read buffer is not empty\n");
 518         abort();
 519     }
 520
 521     f->buf[f->buf_index++] = v;
 522     f->is_write = 1;
 523     if (f->buf_index >= IO_BUF_SIZE)
 524         qemu_fflush(f);
 525 }
 526
 527 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 528 {
 529     int size, l;
 530
 531     if (f->is_write)
 532         abort();
 533
 534     size = size1;
 535     while (size > 0) {
 536         l = f->buf_size - f->buf_index;
 537         if (l == 0) {
 538             qemu_fill_buffer(f);
 539             l = f->buf_size - f->buf_index;
 540             if (l == 0)
 541                 break;
 542         }
 543         if (l > size)
 544             l = size;
 545         memcpy(buf, f->buf + f->buf_index, l);
 546         f->buf_index += l;
 547         buf += l;
 548         size -= l;
 549     }
 550     return size1 - size;
 551 }
 552
 553 static int qemu_peek_byte(QEMUFile *f)
 554 {
 555     if (f->is_write)
 556         abort();
 557
 558     if (f->buf_index >= f->buf_size) {
 559         qemu_fill_buffer(f);
 560         if (f->buf_index >= f->buf_size)
 561             return 0;
 562     }
 563     return f->buf[f->buf_index];
 564 }
 565
 566 int qemu_get_byte(QEMUFile *f)
 567 {
 568     if (f->is_write)
 569         abort();
 570
 571     if (f->buf_index >= f->buf_size) {
 572         qemu_fill_buffer(f);
 573         if (f->buf_index >= f->buf_size)
 574             return 0;
 575     }
 576     return f->buf[f->buf_index++];
 577 }
 578
 579 int64_t qemu_ftell(QEMUFile *f)
 580 {
 581     return f->buf_offset - f->buf_size + f->buf_index;
 582 }
 583
 584 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 585 {
 586     if (whence == SEEK_SET) {
 587         /* nothing to do */
 588     } else if (whence == SEEK_CUR) {
 589         pos += qemu_ftell(f);
 590     } else {
 591         /* SEEK_END not supported */
 592         return -1;
 593     }
 594     if (f->put_buffer) {
 595         qemu_fflush(f);
 596         f->buf_offset = pos;
 597     } else {
 598         f->buf_offset = pos;
 599         f->buf_index = 0;
 600         f->buf_size = 0;
 601     }
 602     return pos;
 603 }
 604
 605 int qemu_file_rate_limit(QEMUFile *f)
 606 {
 607     if (f->rate_limit)
 608         return f->rate_limit(f->opaque);
 609
 610     return 0;
 611 }
 612
 613 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 614 {
 615     if (f->get_rate_limit)
 616         return f->get_rate_limit(f->opaque);
 617
 618     return 0;
 619 }
 620
 621 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 622 {
 623     /* any failed or completed migration keeps its state to allow probing of
 624      * migration data, but has no associated file anymore */
 625     if (f && f->set_rate_limit)
 626         return f->set_rate_limit(f->opaque, new_rate);
 627
 628     return 0;
 629 }
 630
 631 void qemu_put_be16(QEMUFile *f, unsigned int v)
 632 {
 633     qemu_put_byte(f, v >> 8);
 634     qemu_put_byte(f, v);
 635 }
 636
 637 void qemu_put_be32(QEMUFile *f, unsigned int v)
 638 {
 639     qemu_put_byte(f, v >> 24);
 640     qemu_put_byte(f, v >> 16);
 641     qemu_put_byte(f, v >> 8);
 642     qemu_put_byte(f, v);
 643 }
 644
 645 void qemu_put_be64(QEMUFile *f, uint64_t v)
 646 {
 647     qemu_put_be32(f, v >> 32);
 648     qemu_put_be32(f, v);
 649 }
 650
 651 unsigned int qemu_get_be16(QEMUFile *f)
 652 {
 653     unsigned int v;
 654     v = qemu_get_byte(f) << 8;
 655     v |= qemu_get_byte(f);
 656     return v;
 657 }
 658
 659 unsigned int qemu_get_be32(QEMUFile *f)
 660 {
 661     unsigned int v;
 662     v = qemu_get_byte(f) << 24;
 663     v |= qemu_get_byte(f) << 16;
 664     v |= qemu_get_byte(f) << 8;
 665     v |= qemu_get_byte(f);
 666     return v;
 667 }
 668
 669 uint64_t qemu_get_be64(QEMUFile *f)
 670 {
 671     uint64_t v;
 672     v = (uint64_t)qemu_get_be32(f) << 32;
 673     v |= qemu_get_be32(f);
 674     return v;
 675 }
 676
 677 /* bool */
 678
 679 static int get_bool(QEMUFile *f, void *pv, size_t size)
 680 {
 681     bool *v = pv;
 682     *v = qemu_get_byte(f);
 683     return 0;
 684 }
 685
 686 static void put_bool(QEMUFile *f, void *pv, size_t size)
 687 {
 688     bool *v = pv;
 689     qemu_put_byte(f, *v);
 690 }
 691
 692 const VMStateInfo vmstate_info_bool = {
 693     .name = "bool",
 694     .get  = get_bool,
 695     .put  = put_bool,
 696 };
 697
 698 /* 8 bit int */
 699
 700 static int get_int8(QEMUFile *f, void *pv, size_t size)
 701 {
 702     int8_t *v = pv;
 703     qemu_get_s8s(f, v);
 704     return 0;
 705 }
 706
 707 static void put_int8(QEMUFile *f, void *pv, size_t size)
 708 {
 709     int8_t *v = pv;
 710     qemu_put_s8s(f, v);
 711 }
 712
 713 const VMStateInfo vmstate_info_int8 = {
 714     .name = "int8",
 715     .get  = get_int8,
 716     .put  = put_int8,
 717 };
 718
 719 /* 16 bit int */
 720
 721 static int get_int16(QEMUFile *f, void *pv, size_t size)
 722 {
 723     int16_t *v = pv;
 724     qemu_get_sbe16s(f, v);
 725     return 0;
 726 }
 727
 728 static void put_int16(QEMUFile *f, void *pv, size_t size)
 729 {
 730     int16_t *v = pv;
 731     qemu_put_sbe16s(f, v);
 732 }
 733
 734 const VMStateInfo vmstate_info_int16 = {
 735     .name = "int16",
 736     .get  = get_int16,
 737     .put  = put_int16,
 738 };
 739
 740 /* 32 bit int */
 741
 742 static int get_int32(QEMUFile *f, void *pv, size_t size)
 743 {
 744     int32_t *v = pv;
 745     qemu_get_sbe32s(f, v);
 746     return 0;
 747 }
 748
 749 static void put_int32(QEMUFile *f, void *pv, size_t size)
 750 {
 751     int32_t *v = pv;
 752     qemu_put_sbe32s(f, v);
 753 }
 754
 755 const VMStateInfo vmstate_info_int32 = {
 756     .name = "int32",
 757     .get  = get_int32,
 758     .put  = put_int32,
 759 };
 760
 761 /* 32 bit int. See that the received value is the same than the one
 762    in the field */
 763
 764 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 765 {
 766     int32_t *v = pv;
 767     int32_t v2;
 768     qemu_get_sbe32s(f, &v2);
 769
 770     if (*v == v2)
 771         return 0;
 772     return -EINVAL;
 773 }
 774
 775 const VMStateInfo vmstate_info_int32_equal = {
 776     .name = "int32 equal",
 777     .get  = get_int32_equal,
 778     .put  = put_int32,
 779 };
 780
 781 /* 32 bit int. See that the received value is the less or the same
 782    than the one in the field */
 783
 784 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 785 {
 786     int32_t *old = pv;
 787     int32_t new;
 788     qemu_get_sbe32s(f, &new);
 789
 790     if (*old <= new)
 791         return 0;
 792     return -EINVAL;
 793 }
 794
 795 const VMStateInfo vmstate_info_int32_le = {
 796     .name = "int32 equal",
 797     .get  = get_int32_le,
 798     .put  = put_int32,
 799 };
 800
 801 /* 64 bit int */
 802
 803 static int get_int64(QEMUFile *f, void *pv, size_t size)
 804 {
 805     int64_t *v = pv;
 806     qemu_get_sbe64s(f, v);
 807     return 0;
 808 }
 809
 810 static void put_int64(QEMUFile *f, void *pv, size_t size)
 811 {
 812     int64_t *v = pv;
 813     qemu_put_sbe64s(f, v);
 814 }
 815
 816 const VMStateInfo vmstate_info_int64 = {
 817     .name = "int64",
 818     .get  = get_int64,
 819     .put  = put_int64,
 820 };
 821
 822 /* 8 bit unsigned int */
 823
 824 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 825 {
 826     uint8_t *v = pv;
 827     qemu_get_8s(f, v);
 828     return 0;
 829 }
 830
 831 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 832 {
 833     uint8_t *v = pv;
 834     qemu_put_8s(f, v);
 835 }
 836
 837 const VMStateInfo vmstate_info_uint8 = {
 838     .name = "uint8",
 839     .get  = get_uint8,
 840     .put  = put_uint8,
 841 };
 842
 843 /* 16 bit unsigned int */
 844
 845 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 846 {
 847     uint16_t *v = pv;
 848     qemu_get_be16s(f, v);
 849     return 0;
 850 }
 851
 852 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 853 {
 854     uint16_t *v = pv;
 855     qemu_put_be16s(f, v);
 856 }
 857
 858 const VMStateInfo vmstate_info_uint16 = {
 859     .name = "uint16",
 860     .get  = get_uint16,
 861     .put  = put_uint16,
 862 };
 863
 864 /* 32 bit unsigned int */
 865
 866 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 867 {
 868     uint32_t *v = pv;
 869     qemu_get_be32s(f, v);
 870     return 0;
 871 }
 872
 873 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 874 {
 875     uint32_t *v = pv;
 876     qemu_put_be32s(f, v);
 877 }
 878
 879 const VMStateInfo vmstate_info_uint32 = {
 880     .name = "uint32",
 881     .get  = get_uint32,
 882     .put  = put_uint32,
 883 };
 884
 885 /* 32 bit uint. See that the received value is the same than the one
 886    in the field */
 887
 888 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 889 {
 890     uint32_t *v = pv;
 891     uint32_t v2;
 892     qemu_get_be32s(f, &v2);
 893
 894     if (*v == v2) {
 895         return 0;
 896     }
 897     return -EINVAL;
 898 }
 899
 900 const VMStateInfo vmstate_info_uint32_equal = {
 901     .name = "uint32 equal",
 902     .get  = get_uint32_equal,
 903     .put  = put_uint32,
 904 };
 905
 906 /* 64 bit unsigned int */
 907
 908 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 909 {
 910     uint64_t *v = pv;
 911     qemu_get_be64s(f, v);
 912     return 0;
 913 }
 914
 915 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 916 {
 917     uint64_t *v = pv;
 918     qemu_put_be64s(f, v);
 919 }
 920
 921 const VMStateInfo vmstate_info_uint64 = {
 922     .name = "uint64",
 923     .get  = get_uint64,
 924     .put  = put_uint64,
 925 };
 926
 927 /* 8 bit int. See that the received value is the same than the one
 928    in the field */
 929
 930 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 931 {
 932     uint8_t *v = pv;
 933     uint8_t v2;
 934     qemu_get_8s(f, &v2);
 935
 936     if (*v == v2)
 937         return 0;
 938     return -EINVAL;
 939 }
 940
 941 const VMStateInfo vmstate_info_uint8_equal = {
 942     .name = "uint8 equal",
 943     .get  = get_uint8_equal,
 944     .put  = put_uint8,
 945 };
 946
 947 /* 16 bit unsigned int int. See that the received value is the same than the one
 948    in the field */
 949
 950 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 951 {
 952     uint16_t *v = pv;
 953     uint16_t v2;
 954     qemu_get_be16s(f, &v2);
 955
 956     if (*v == v2)
 957         return 0;
 958     return -EINVAL;
 959 }
 960
 961 const VMStateInfo vmstate_info_uint16_equal = {
 962     .name = "uint16 equal",
 963     .get  = get_uint16_equal,
 964     .put  = put_uint16,
 965 };
 966
 967 /* timers  */
 968
 969 static int get_timer(QEMUFile *f, void *pv, size_t size)
 970 {
 971     QEMUTimer *v = pv;
 972     qemu_get_timer(f, v);
 973     return 0;
 974 }
 975
 976 static void put_timer(QEMUFile *f, void *pv, size_t size)
 977 {
 978     QEMUTimer *v = pv;
 979     qemu_put_timer(f, v);
 980 }
 981
 982 const VMStateInfo vmstate_info_timer = {
 983     .name = "timer",
 984     .get  = get_timer,
 985     .put  = put_timer,
 986 };
 987
 988 /* uint8_t buffers */
 989
 990 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 991 {
 992     uint8_t *v = pv;
 993     qemu_get_buffer(f, v, size);
 994     return 0;
 995 }
 996
 997 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 998 {
 999     uint8_t *v = pv;
1000     qemu_put_buffer(f, v, size);
1001 }
1002
1003 const VMStateInfo vmstate_info_buffer = {
1004     .name = "buffer",
1005     .get  = get_buffer,
1006     .put  = put_buffer,
1007 };
1008
1009 /* unused buffers: space that was used for some fields that are
1010    not useful anymore */
1011
1012 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1013 {
1014     uint8_t buf[1024];
1015     int block_len;
1016
1017     while (size > 0) {
1018         block_len = MIN(sizeof(buf), size);
1019         size -= block_len;
1020         qemu_get_buffer(f, buf, block_len);
1021     }
1022    return 0;
1023 }
1024
1025 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1026 {
1027     static const uint8_t buf[1024];
1028     int block_len;
1029
1030     while (size > 0) {
1031         block_len = MIN(sizeof(buf), size);
1032         size -= block_len;
1033         qemu_put_buffer(f, buf, block_len);
1034     }
1035 }
1036
1037 const VMStateInfo vmstate_info_unused_buffer = {
1038     .name = "unused_buffer",
1039     .get  = get_unused_buffer,
1040     .put  = put_unused_buffer,
1041 };
1042
1043 typedef struct CompatEntry {
1044     char idstr[256];
1045     int instance_id;
1046 } CompatEntry;
1047
1048 typedef struct SaveStateEntry {
1049     QTAILQ_ENTRY(SaveStateEntry) entry;
1050     char idstr[256];
1051     int instance_id;
1052     int alias_id;
1053     int version_id;
1054     int section_id;
1055     SaveSetParamsHandler *set_params;
1056     SaveLiveStateHandler *save_live_state;
1057     SaveStateHandler *save_state;
1058     LoadStateHandler *load_state;
1059     const VMStateDescription *vmsd;
1060     void *opaque;
1061     CompatEntry *compat;
1062     int no_migrate;
1063 } SaveStateEntry;
1064
1065
1066 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1067     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1068 static int global_section_id;
1069
1070 static int calculate_new_instance_id(const char *idstr)
1071 {
1072     SaveStateEntry *se;
1073     int instance_id = 0;
1074
1075     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1076         if (strcmp(idstr, se->idstr) == 0
1077             && instance_id <= se->instance_id) {
1078             instance_id = se->instance_id + 1;
1079         }
1080     }
1081     return instance_id;
1082 }
1083
1084 static int calculate_compat_instance_id(const char *idstr)
1085 {
1086     SaveStateEntry *se;
1087     int instance_id = 0;
1088
1089     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1090         if (!se->compat)
1091             continue;
1092
1093         if (strcmp(idstr, se->compat->idstr) == 0
1094             && instance_id <= se->compat->instance_id) {
1095             instance_id = se->compat->instance_id + 1;
1096         }
1097     }
1098     return instance_id;
1099 }
1100
1101 /* TODO: Individual devices generally have very little idea about the rest
1102    of the system, so instance_id should be removed/replaced.
1103    Meanwhile pass -1 as instance_id if you do not already have a clearly
1104    distinguishing id for all instances of your device class. */
1105 int register_savevm_live(DeviceState *dev,
1106                          const char *idstr,
1107                          int instance_id,
1108                          int version_id,
1109                          SaveSetParamsHandler *set_params,
1110                          SaveLiveStateHandler *save_live_state,
1111                          SaveStateHandler *save_state,
1112                          LoadStateHandler *load_state,
1113                          void *opaque)
1114 {
1115     SaveStateEntry *se;
1116
1117     se = g_malloc0(sizeof(SaveStateEntry));
1118     se->version_id = version_id;
1119     se->section_id = global_section_id++;
1120     se->set_params = set_params;
1121     se->save_live_state = save_live_state;
1122     se->save_state = save_state;
1123     se->load_state = load_state;
1124     se->opaque = opaque;
1125     se->vmsd = NULL;
1126     se->no_migrate = 0;
1127
1128     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1129         char *id = dev->parent_bus->info->get_dev_path(dev);
1130         if (id) {
1131             pstrcpy(se->idstr, sizeof(se->idstr), id);
1132             pstrcat(se->idstr, sizeof(se->idstr), "/");
1133             g_free(id);
1134
1135             se->compat = g_malloc0(sizeof(CompatEntry));
1136             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1137             se->compat->instance_id = instance_id == -1 ?
1138                          calculate_compat_instance_id(idstr) : instance_id;
1139             instance_id = -1;
1140         }
1141     }
1142     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1143
1144     if (instance_id == -1) {
1145         se->instance_id = calculate_new_instance_id(se->idstr);
1146     } else {
1147         se->instance_id = instance_id;
1148     }
1149     assert(!se->compat || se->instance_id == 0);
1150     /* add at the end of list */
1151     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1152     return 0;
1153 }
1154
1155 int register_savevm(DeviceState *dev,
1156                     const char *idstr,
1157                     int instance_id,
1158                     int version_id,
1159                     SaveStateHandler *save_state,
1160                     LoadStateHandler *load_state,
1161                     void *opaque)
1162 {
1163     return register_savevm_live(dev, idstr, instance_id, version_id,
1164                                 NULL, NULL, save_state, load_state, opaque);
1165 }
1166
1167 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1168 {
1169     SaveStateEntry *se, *new_se;
1170     char id[256] = "";
1171
1172     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1173         char *path = dev->parent_bus->info->get_dev_path(dev);
1174         if (path) {
1175             pstrcpy(id, sizeof(id), path);
1176             pstrcat(id, sizeof(id), "/");
1177             g_free(path);
1178         }
1179     }
1180     pstrcat(id, sizeof(id), idstr);
1181
1182     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1183         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1184             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1185             if (se->compat) {
1186                 g_free(se->compat);
1187             }
1188             g_free(se);
1189         }
1190     }
1191 }
1192
1193 /* mark a device as not to be migrated, that is the device should be
1194    unplugged before migration */
1195 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1196                                                             void *opaque)
1197 {
1198     SaveStateEntry *se;
1199     char id[256] = "";
1200
1201     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1202         char *path = dev->parent_bus->info->get_dev_path(dev);
1203         if (path) {
1204             pstrcpy(id, sizeof(id), path);
1205             pstrcat(id, sizeof(id), "/");
1206             g_free(path);
1207         }
1208     }
1209     pstrcat(id, sizeof(id), idstr);
1210
1211     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1212         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1213             se->no_migrate = 1;
1214         }
1215     }
1216 }
1217
1218 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1219                                    const VMStateDescription *vmsd,
1220                                    void *opaque, int alias_id,
1221                                    int required_for_version)
1222 {
1223     SaveStateEntry *se;
1224
1225     /* If this triggers, alias support can be dropped for the vmsd. */
1226     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1227
1228     se = g_malloc0(sizeof(SaveStateEntry));
1229     se->version_id = vmsd->version_id;
1230     se->section_id = global_section_id++;
1231     se->save_live_state = NULL;
1232     se->save_state = NULL;
1233     se->load_state = NULL;
1234     se->opaque = opaque;
1235     se->vmsd = vmsd;
1236     se->alias_id = alias_id;
1237     se->no_migrate = vmsd->unmigratable;
1238
1239     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1240         char *id = dev->parent_bus->info->get_dev_path(dev);
1241         if (id) {
1242             pstrcpy(se->idstr, sizeof(se->idstr), id);
1243             pstrcat(se->idstr, sizeof(se->idstr), "/");
1244             g_free(id);
1245
1246             se->compat = g_malloc0(sizeof(CompatEntry));
1247             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1248             se->compat->instance_id = instance_id == -1 ?
1249                          calculate_compat_instance_id(vmsd->name) : instance_id;
1250             instance_id = -1;
1251         }
1252     }
1253     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1254
1255     if (instance_id == -1) {
1256         se->instance_id = calculate_new_instance_id(se->idstr);
1257     } else {
1258         se->instance_id = instance_id;
1259     }
1260     assert(!se->compat || se->instance_id == 0);
1261     /* add at the end of list */
1262     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1263     return 0;
1264 }
1265
1266 int vmstate_register(DeviceState *dev, int instance_id,
1267                      const VMStateDescription *vmsd, void *opaque)
1268 {
1269     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1270                                           opaque, -1, 0);
1271 }
1272
1273 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1274                         void *opaque)
1275 {
1276     SaveStateEntry *se, *new_se;
1277
1278     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1279         if (se->vmsd == vmsd && se->opaque == opaque) {
1280             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1281             if (se->compat) {
1282                 g_free(se->compat);
1283             }
1284             g_free(se);
1285         }
1286     }
1287 }
1288
1289 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1290                                     void *opaque);
1291 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1292                                    void *opaque);
1293
1294 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1295                        void *opaque, int version_id)
1296 {
1297     VMStateField *field = vmsd->fields;
1298     int ret;
1299
1300     if (version_id > vmsd->version_id) {
1301         return -EINVAL;
1302     }
1303     if (version_id < vmsd->minimum_version_id_old) {
1304         return -EINVAL;
1305     }
1306     if  (version_id < vmsd->minimum_version_id) {
1307         return vmsd->load_state_old(f, opaque, version_id);
1308     }
1309     if (vmsd->pre_load) {
1310         int ret = vmsd->pre_load(opaque);
1311         if (ret)
1312             return ret;
1313     }
1314     while(field->name) {
1315         if ((field->field_exists &&
1316              field->field_exists(opaque, version_id)) ||
1317             (!field->field_exists &&
1318              field->version_id <= version_id)) {
1319             void *base_addr = opaque + field->offset;
1320             int i, n_elems = 1;
1321             int size = field->size;
1322
1323             if (field->flags & VMS_VBUFFER) {
1324                 size = *(int32_t *)(opaque+field->size_offset);
1325                 if (field->flags & VMS_MULTIPLY) {
1326                     size *= field->size;
1327                 }
1328             }
1329             if (field->flags & VMS_ARRAY) {
1330                 n_elems = field->num;
1331             } else if (field->flags & VMS_VARRAY_INT32) {
1332                 n_elems = *(int32_t *)(opaque+field->num_offset);
1333             } else if (field->flags & VMS_VARRAY_UINT32) {
1334                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1335             } else if (field->flags & VMS_VARRAY_UINT16) {
1336                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1337             } else if (field->flags & VMS_VARRAY_UINT8) {
1338                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1339             }
1340             if (field->flags & VMS_POINTER) {
1341                 base_addr = *(void **)base_addr + field->start;
1342             }
1343             for (i = 0; i < n_elems; i++) {
1344                 void *addr = base_addr + size * i;
1345
1346                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1347                     addr = *(void **)addr;
1348                 }
1349                 if (field->flags & VMS_STRUCT) {
1350                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1351                 } else {
1352                     ret = field->info->get(f, addr, size);
1353
1354                 }
1355                 if (ret < 0) {
1356                     return ret;
1357                 }
1358             }
1359         }
1360         field++;
1361     }
1362     ret = vmstate_subsection_load(f, vmsd, opaque);
1363     if (ret != 0) {
1364         return ret;
1365     }
1366     if (vmsd->post_load) {
1367         return vmsd->post_load(opaque, version_id);
1368     }
1369     return 0;
1370 }
1371
1372 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1373                         void *opaque)
1374 {
1375     VMStateField *field = vmsd->fields;
1376
1377     if (vmsd->pre_save) {
1378         vmsd->pre_save(opaque);
1379     }
1380     while(field->name) {
1381         if (!field->field_exists ||
1382             field->field_exists(opaque, vmsd->version_id)) {
1383             void *base_addr = opaque + field->offset;
1384             int i, n_elems = 1;
1385             int size = field->size;
1386
1387             if (field->flags & VMS_VBUFFER) {
1388                 size = *(int32_t *)(opaque+field->size_offset);
1389                 if (field->flags & VMS_MULTIPLY) {
1390                     size *= field->size;
1391                 }
1392             }
1393             if (field->flags & VMS_ARRAY) {
1394                 n_elems = field->num;
1395             } else if (field->flags & VMS_VARRAY_INT32) {
1396                 n_elems = *(int32_t *)(opaque+field->num_offset);
1397             } else if (field->flags & VMS_VARRAY_UINT16) {
1398                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1399             } else if (field->flags & VMS_VARRAY_UINT8) {
1400                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1401             }
1402             if (field->flags & VMS_POINTER) {
1403                 base_addr = *(void **)base_addr + field->start;
1404             }
1405             for (i = 0; i < n_elems; i++) {
1406                 void *addr = base_addr + size * i;
1407
1408                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1409                     addr = *(void **)addr;
1410                 }
1411                 if (field->flags & VMS_STRUCT) {
1412                     vmstate_save_state(f, field->vmsd, addr);
1413                 } else {
1414                     field->info->put(f, addr, size);
1415                 }
1416             }
1417         }
1418         field++;
1419     }
1420     vmstate_subsection_save(f, vmsd, opaque);
1421 }
1422
1423 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1424 {
1425     if (!se->vmsd) {         /* Old style */
1426         return se->load_state(f, se->opaque, version_id);
1427     }
1428     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1429 }
1430
1431 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1432 {
1433     if (!se->vmsd) {         /* Old style */
1434         se->save_state(f, se->opaque);
1435         return;
1436     }
1437     vmstate_save_state(f,se->vmsd, se->opaque);
1438 }
1439
1440 #define QEMU_VM_FILE_MAGIC           0x5145564d
1441 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1442 #define QEMU_VM_FILE_VERSION         0x00000003
1443
1444 #define QEMU_VM_EOF                  0x00
1445 #define QEMU_VM_SECTION_START        0x01
1446 #define QEMU_VM_SECTION_PART         0x02
1447 #define QEMU_VM_SECTION_END          0x03
1448 #define QEMU_VM_SECTION_FULL         0x04
1449 #define QEMU_VM_SUBSECTION           0x05
1450
1451 bool qemu_savevm_state_blocked(Monitor *mon)
1452 {
1453     SaveStateEntry *se;
1454
1455     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1456         if (se->no_migrate) {
1457             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1458                            se->idstr);
1459             return true;
1460         }
1461     }
1462     return false;
1463 }
1464
1465 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1466                             int shared)
1467 {
1468     SaveStateEntry *se;
1469
1470     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1471         if(se->set_params == NULL) {
1472             continue;
1473         }
1474         se->set_params(blk_enable, shared, se->opaque);
1475     }
1476
1477     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1478     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1479
1480     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1481         int len;
1482
1483         if (se->save_live_state == NULL)
1484             continue;
1485
1486         /* Section type */
1487         qemu_put_byte(f, QEMU_VM_SECTION_START);
1488         qemu_put_be32(f, se->section_id);
1489
1490         /* ID string */
1491         len = strlen(se->idstr);
1492         qemu_put_byte(f, len);
1493         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1494
1495         qemu_put_be32(f, se->instance_id);
1496         qemu_put_be32(f, se->version_id);
1497
1498         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1499     }
1500
1501     if (qemu_file_has_error(f)) {
1502         qemu_savevm_state_cancel(mon, f);
1503         return -EIO;
1504     }
1505
1506     return 0;
1507 }
1508
1509 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1510 {
1511     SaveStateEntry *se;
1512     int ret = 1;
1513
1514     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1515         if (se->save_live_state == NULL)
1516             continue;
1517
1518         /* Section type */
1519         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1520         qemu_put_be32(f, se->section_id);
1521
1522         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1523         if (!ret) {
1524             /* Do not proceed to the next vmstate before this one reported
1525                completion of the current stage. This serializes the migration
1526                and reduces the probability that a faster changing state is
1527                synchronized over and over again. */
1528             break;
1529         }
1530     }
1531
1532     if (ret)
1533         return 1;
1534
1535     if (qemu_file_has_error(f)) {
1536         qemu_savevm_state_cancel(mon, f);
1537         return -EIO;
1538     }
1539
1540     return 0;
1541 }
1542
1543 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1544 {
1545     SaveStateEntry *se;
1546
1547     cpu_synchronize_all_states();
1548
1549     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1550         if (se->save_live_state == NULL)
1551             continue;
1552
1553         /* Section type */
1554         qemu_put_byte(f, QEMU_VM_SECTION_END);
1555         qemu_put_be32(f, se->section_id);
1556
1557         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1558     }
1559
1560     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1561         int len;
1562
1563         if (se->save_state == NULL && se->vmsd == NULL)
1564             continue;
1565
1566         /* Section type */
1567         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1568         qemu_put_be32(f, se->section_id);
1569
1570         /* ID string */
1571         len = strlen(se->idstr);
1572         qemu_put_byte(f, len);
1573         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1574
1575         qemu_put_be32(f, se->instance_id);
1576         qemu_put_be32(f, se->version_id);
1577
1578         vmstate_save(f, se);
1579     }
1580
1581     qemu_put_byte(f, QEMU_VM_EOF);
1582
1583     if (qemu_file_has_error(f))
1584         return -EIO;
1585
1586     return 0;
1587 }
1588
1589 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1590 {
1591     SaveStateEntry *se;
1592
1593     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1594         if (se->save_live_state) {
1595             se->save_live_state(mon, f, -1, se->opaque);
1596         }
1597     }
1598 }
1599
1600 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1601 {
1602     int saved_vm_running;
1603     int ret;
1604
1605     saved_vm_running = runstate_is_running();
1606     vm_stop(RUN_STATE_SAVE_VM);
1607
1608     if (qemu_savevm_state_blocked(mon)) {
1609         ret = -EINVAL;
1610         goto out;
1611     }
1612
1613     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1614     if (ret < 0)
1615         goto out;
1616
1617     do {
1618         ret = qemu_savevm_state_iterate(mon, f);
1619         if (ret < 0)
1620             goto out;
1621     } while (ret == 0);
1622
1623     ret = qemu_savevm_state_complete(mon, f);
1624
1625 out:
1626     if (qemu_file_has_error(f))
1627         ret = -EIO;
1628
1629     if (!ret && saved_vm_running)
1630         vm_start();
1631
1632     return ret;
1633 }
1634
1635 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1636 {
1637     SaveStateEntry *se;
1638
1639     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1640         if (!strcmp(se->idstr, idstr) &&
1641             (instance_id == se->instance_id ||
1642              instance_id == se->alias_id))
1643             return se;
1644         /* Migrating from an older version? */
1645         if (strstr(se->idstr, idstr) && se->compat) {
1646             if (!strcmp(se->compat->idstr, idstr) &&
1647                 (instance_id == se->compat->instance_id ||
1648                  instance_id == se->alias_id))
1649                 return se;
1650         }
1651     }
1652     return NULL;
1653 }
1654
1655 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1656 {
1657     while(sub && sub->needed) {
1658         if (strcmp(idstr, sub->vmsd->name) == 0) {
1659             return sub->vmsd;
1660         }
1661         sub++;
1662     }
1663     return NULL;
1664 }
1665
1666 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1667                                    void *opaque)
1668 {
1669     const VMStateSubsection *sub = vmsd->subsections;
1670
1671     if (!sub || !sub->needed) {
1672         return 0;
1673     }
1674
1675     while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1676         char idstr[256];
1677         int ret;
1678         uint8_t version_id, len;
1679         const VMStateDescription *sub_vmsd;
1680
1681         qemu_get_byte(f); /* subsection */
1682         len = qemu_get_byte(f);
1683         qemu_get_buffer(f, (uint8_t *)idstr, len);
1684         idstr[len] = 0;
1685         version_id = qemu_get_be32(f);
1686
1687         sub_vmsd = vmstate_get_subsection(sub, idstr);
1688         if (sub_vmsd == NULL) {
1689             return -ENOENT;
1690         }
1691         assert(!sub_vmsd->subsections);
1692         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1693         if (ret) {
1694             return ret;
1695         }
1696     }
1697     return 0;
1698 }
1699
1700 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1701                                     void *opaque)
1702 {
1703     const VMStateSubsection *sub = vmsd->subsections;
1704
1705     while (sub && sub->needed) {
1706         if (sub->needed(opaque)) {
1707             const VMStateDescription *vmsd = sub->vmsd;
1708             uint8_t len;
1709
1710             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1711             len = strlen(vmsd->name);
1712             qemu_put_byte(f, len);
1713             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1714             qemu_put_be32(f, vmsd->version_id);
1715             assert(!vmsd->subsections);
1716             vmstate_save_state(f, vmsd, opaque);
1717         }
1718         sub++;
1719     }
1720 }
1721
1722 typedef struct LoadStateEntry {
1723     QLIST_ENTRY(LoadStateEntry) entry;
1724     SaveStateEntry *se;
1725     int section_id;
1726     int version_id;
1727 } LoadStateEntry;
1728
1729 int qemu_loadvm_state(QEMUFile *f)
1730 {
1731     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1732         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1733     LoadStateEntry *le, *new_le;
1734     uint8_t section_type;
1735     unsigned int v;
1736     int ret;
1737
1738     if (qemu_savevm_state_blocked(default_mon)) {
1739         return -EINVAL;
1740     }
1741
1742     v = qemu_get_be32(f);
1743     if (v != QEMU_VM_FILE_MAGIC)
1744         return -EINVAL;
1745
1746     v = qemu_get_be32(f);
1747     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1748         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1749         return -ENOTSUP;
1750     }
1751     if (v != QEMU_VM_FILE_VERSION)
1752         return -ENOTSUP;
1753
1754     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1755         uint32_t instance_id, version_id, section_id;
1756         SaveStateEntry *se;
1757         char idstr[257];
1758         int len;
1759
1760         switch (section_type) {
1761         case QEMU_VM_SECTION_START:
1762         case QEMU_VM_SECTION_FULL:
1763             /* Read section start */
1764             section_id = qemu_get_be32(f);
1765             len = qemu_get_byte(f);
1766             qemu_get_buffer(f, (uint8_t *)idstr, len);
1767             idstr[len] = 0;
1768             instance_id = qemu_get_be32(f);
1769             version_id = qemu_get_be32(f);
1770
1771             /* Find savevm section */
1772             se = find_se(idstr, instance_id);
1773             if (se == NULL) {
1774                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1775                 ret = -EINVAL;
1776                 goto out;
1777             }
1778
1779             /* Validate version */
1780             if (version_id > se->version_id) {
1781                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1782                         version_id, idstr, se->version_id);
1783                 ret = -EINVAL;
1784                 goto out;
1785             }
1786
1787             /* Add entry */
1788             le = g_malloc0(sizeof(*le));
1789
1790             le->se = se;
1791             le->section_id = section_id;
1792             le->version_id = version_id;
1793             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1794
1795             ret = vmstate_load(f, le->se, le->version_id);
1796             if (ret < 0) {
1797                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1798                         instance_id, idstr);
1799                 goto out;
1800             }
1801             break;
1802         case QEMU_VM_SECTION_PART:
1803         case QEMU_VM_SECTION_END:
1804             section_id = qemu_get_be32(f);
1805
1806             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1807                 if (le->section_id == section_id) {
1808                     break;
1809                 }
1810             }
1811             if (le == NULL) {
1812                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1813                 ret = -EINVAL;
1814                 goto out;
1815             }
1816
1817             ret = vmstate_load(f, le->se, le->version_id);
1818             if (ret < 0) {
1819                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1820                         section_id);
1821                 goto out;
1822             }
1823             break;
1824         default:
1825             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1826             ret = -EINVAL;
1827             goto out;
1828         }
1829     }
1830
1831     cpu_synchronize_all_post_init();
1832
1833     ret = 0;
1834
1835 out:
1836     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1837         QLIST_REMOVE(le, entry);
1838         g_free(le);
1839     }
1840
1841     if (qemu_file_has_error(f))
1842         ret = -EIO;
1843
1844     return ret;
1845 }
1846
1847 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1848                               const char *name)
1849 {
1850     QEMUSnapshotInfo *sn_tab, *sn;
1851     int nb_sns, i, ret;
1852
1853     ret = -ENOENT;
1854     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1855     if (nb_sns < 0)
1856         return ret;
1857     for(i = 0; i < nb_sns; i++) {
1858         sn = &sn_tab[i];
1859         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1860             *sn_info = *sn;
1861             ret = 0;
1862             break;
1863         }
1864     }
1865     g_free(sn_tab);
1866     return ret;
1867 }
1868
1869 /*
1870  * Deletes snapshots of a given name in all opened images.
1871  */
1872 static int del_existing_snapshots(Monitor *mon, const char *name)
1873 {
1874     BlockDriverState *bs;
1875     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1876     int ret;
1877
1878     bs = NULL;
1879     while ((bs = bdrv_next(bs))) {
1880         if (bdrv_can_snapshot(bs) &&
1881             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1882         {
1883             ret = bdrv_snapshot_delete(bs, name);
1884             if (ret < 0) {
1885                 monitor_printf(mon,
1886                                "Error while deleting snapshot on '%s'\n",
1887                                bdrv_get_device_name(bs));
1888                 return -1;
1889             }
1890         }
1891     }
1892
1893     return 0;
1894 }
1895
1896 void do_savevm(Monitor *mon, const QDict *qdict)
1897 {
1898     BlockDriverState *bs, *bs1;
1899     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1900     int ret;
1901     QEMUFile *f;
1902     int saved_vm_running;
1903     uint32_t vm_state_size;
1904 #ifdef _WIN32
1905     struct _timeb tb;
1906     struct tm *ptm;
1907 #else
1908     struct timeval tv;
1909     struct tm tm;
1910 #endif
1911     const char *name = qdict_get_try_str(qdict, "name");
1912
1913     /* Verify if there is a device that doesn't support snapshots and is writable */
1914     bs = NULL;
1915     while ((bs = bdrv_next(bs))) {
1916
1917         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1918             continue;
1919         }
1920
1921         if (!bdrv_can_snapshot(bs)) {
1922             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1923                                bdrv_get_device_name(bs));
1924             return;
1925         }
1926     }
1927
1928     bs = bdrv_snapshots();
1929     if (!bs) {
1930         monitor_printf(mon, "No block device can accept snapshots\n");
1931         return;
1932     }
1933
1934     saved_vm_running = runstate_is_running();
1935     vm_stop(RUN_STATE_SAVE_VM);
1936
1937     memset(sn, 0, sizeof(*sn));
1938
1939     /* fill auxiliary fields */
1940 #ifdef _WIN32
1941     _ftime(&tb);
1942     sn->date_sec = tb.time;
1943     sn->date_nsec = tb.millitm * 1000000;
1944 #else
1945     gettimeofday(&tv, NULL);
1946     sn->date_sec = tv.tv_sec;
1947     sn->date_nsec = tv.tv_usec * 1000;
1948 #endif
1949     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
1950
1951     if (name) {
1952         ret = bdrv_snapshot_find(bs, old_sn, name);
1953         if (ret >= 0) {
1954             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1955             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1956         } else {
1957             pstrcpy(sn->name, sizeof(sn->name), name);
1958         }
1959     } else {
1960 #ifdef _WIN32
1961         ptm = localtime(&tb.time);
1962         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1963 #else
1964         /* cast below needed for OpenBSD where tv_sec is still 'long' */
1965         localtime_r((const time_t *)&tv.tv_sec, &tm);
1966         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1967 #endif
1968     }
1969
1970     /* Delete old snapshots of the same name */
1971     if (name && del_existing_snapshots(mon, name) < 0) {
1972         goto the_end;
1973     }
1974
1975     /* save the VM state */
1976     f = qemu_fopen_bdrv(bs, 1);
1977     if (!f) {
1978         monitor_printf(mon, "Could not open VM state file\n");
1979         goto the_end;
1980     }
1981     ret = qemu_savevm_state(mon, f);
1982     vm_state_size = qemu_ftell(f);
1983     qemu_fclose(f);
1984     if (ret < 0) {
1985         monitor_printf(mon, "Error %d while writing VM\n", ret);
1986         goto the_end;
1987     }
1988
1989     /* create the snapshots */
1990
1991     bs1 = NULL;
1992     while ((bs1 = bdrv_next(bs1))) {
1993         if (bdrv_can_snapshot(bs1)) {
1994             /* Write VM state size only to the image that contains the state */
1995             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1996             ret = bdrv_snapshot_create(bs1, sn);
1997             if (ret < 0) {
1998                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1999                                bdrv_get_device_name(bs1));
2000             }
2001         }
2002     }
2003
2004  the_end:
2005     if (saved_vm_running)
2006         vm_start();
2007 }
2008
2009 int load_vmstate(const char *name)
2010 {
2011     BlockDriverState *bs, *bs_vm_state;
2012     QEMUSnapshotInfo sn;
2013     QEMUFile *f;
2014     int ret;
2015
2016     bs_vm_state = bdrv_snapshots();
2017     if (!bs_vm_state) {
2018         error_report("No block device supports snapshots");
2019         return -ENOTSUP;
2020     }
2021
2022     /* Don't even try to load empty VM states */
2023     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2024     if (ret < 0) {
2025         return ret;
2026     } else if (sn.vm_state_size == 0) {
2027         error_report("This is a disk-only snapshot. Revert to it offline "
2028             "using qemu-img.");
2029         return -EINVAL;
2030     }
2031
2032     /* Verify if there is any device that doesn't support snapshots and is
2033     writable and check if the requested snapshot is available too. */
2034     bs = NULL;
2035     while ((bs = bdrv_next(bs))) {
2036
2037         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2038             continue;
2039         }
2040
2041         if (!bdrv_can_snapshot(bs)) {
2042             error_report("Device '%s' is writable but does not support snapshots.",
2043                                bdrv_get_device_name(bs));
2044             return -ENOTSUP;
2045         }
2046
2047         ret = bdrv_snapshot_find(bs, &sn, name);
2048         if (ret < 0) {
2049             error_report("Device '%s' does not have the requested snapshot '%s'",
2050                            bdrv_get_device_name(bs), name);
2051             return ret;
2052         }
2053     }
2054
2055     /* Flush all IO requests so they don't interfere with the new state.  */
2056     qemu_aio_flush();
2057
2058     bs = NULL;
2059     while ((bs = bdrv_next(bs))) {
2060         if (bdrv_can_snapshot(bs)) {
2061             ret = bdrv_snapshot_goto(bs, name);
2062             if (ret < 0) {
2063                 error_report("Error %d while activating snapshot '%s' on '%s'",
2064                              ret, name, bdrv_get_device_name(bs));
2065                 return ret;
2066             }
2067         }
2068     }
2069
2070     /* restore the VM state */
2071     f = qemu_fopen_bdrv(bs_vm_state, 0);
2072     if (!f) {
2073         error_report("Could not open VM state file");
2074         return -EINVAL;
2075     }
2076
2077     qemu_system_reset(VMRESET_SILENT);
2078     ret = qemu_loadvm_state(f);
2079
2080     qemu_fclose(f);
2081     if (ret < 0) {
2082         error_report("Error %d while loading VM state", ret);
2083         return ret;
2084     }
2085
2086     return 0;
2087 }
2088
2089 void do_delvm(Monitor *mon, const QDict *qdict)
2090 {
2091     BlockDriverState *bs, *bs1;
2092     int ret;
2093     const char *name = qdict_get_str(qdict, "name");
2094
2095     bs = bdrv_snapshots();
2096     if (!bs) {
2097         monitor_printf(mon, "No block device supports snapshots\n");
2098         return;
2099     }
2100
2101     bs1 = NULL;
2102     while ((bs1 = bdrv_next(bs1))) {
2103         if (bdrv_can_snapshot(bs1)) {
2104             ret = bdrv_snapshot_delete(bs1, name);
2105             if (ret < 0) {
2106                 if (ret == -ENOTSUP)
2107                     monitor_printf(mon,
2108                                    "Snapshots not supported on device '%s'\n",
2109                                    bdrv_get_device_name(bs1));
2110                 else
2111                     monitor_printf(mon, "Error %d while deleting snapshot on "
2112                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2113             }
2114         }
2115     }
2116 }
2117
2118 void do_info_snapshots(Monitor *mon)
2119 {
2120     BlockDriverState *bs, *bs1;
2121     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2122     int nb_sns, i, ret, available;
2123     int total;
2124     int *available_snapshots;
2125     char buf[256];
2126
2127     bs = bdrv_snapshots();
2128     if (!bs) {
2129         monitor_printf(mon, "No available block device supports snapshots\n");
2130         return;
2131     }
2132
2133     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2134     if (nb_sns < 0) {
2135         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2136         return;
2137     }
2138
2139     if (nb_sns == 0) {
2140         monitor_printf(mon, "There is no snapshot available.\n");
2141         return;
2142     }
2143
2144     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2145     total = 0;
2146     for (i = 0; i < nb_sns; i++) {
2147         sn = &sn_tab[i];
2148         available = 1;
2149         bs1 = NULL;
2150
2151         while ((bs1 = bdrv_next(bs1))) {
2152             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2153                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2154                 if (ret < 0) {
2155                     available = 0;
2156                     break;
2157                 }
2158             }
2159         }
2160
2161         if (available) {
2162             available_snapshots[total] = i;
2163             total++;
2164         }
2165     }
2166
2167     if (total > 0) {
2168         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2169         for (i = 0; i < total; i++) {
2170             sn = &sn_tab[available_snapshots[i]];
2171             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2172         }
2173     } else {
2174         monitor_printf(mon, "There is no suitable snapshot available\n");
2175     }
2176
2177     g_free(sn_tab);
2178     g_free(available_snapshots);
2179
2180 }