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     int pending;
 459
 460     if (!f->get_buffer)
 461         return;
 462
 463     if (f->is_write)
 464         abort();
 465
 466     pending = f->buf_size - f->buf_index;
 467     if (pending > 0) {
 468         memmove(f->buf, f->buf + f->buf_index, pending);
 469     }
 470     f->buf_index = 0;
 471     f->buf_size = pending;
 472
 473     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 474                         IO_BUF_SIZE - pending);
 475     if (len > 0) {
 476         f->buf_size += len;
 477         f->buf_offset += len;
 478     } else if (len != -EAGAIN)
 479         f->has_error = 1;
 480 }
 481
 482 int qemu_fclose(QEMUFile *f)
 483 {
 484     int ret = 0;
 485     qemu_fflush(f);
 486     if (f->close)
 487         ret = f->close(f->opaque);
 488     g_free(f);
 489     return ret;
 490 }
 491
 492 void qemu_file_put_notify(QEMUFile *f)
 493 {
 494     f->put_buffer(f->opaque, NULL, 0, 0);
 495 }
 496
 497 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 498 {
 499     int l;
 500
 501     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 502         fprintf(stderr,
 503                 "Attempted to write to buffer while read buffer is not empty\n");
 504         abort();
 505     }
 506
 507     while (!f->has_error && size > 0) {
 508         l = IO_BUF_SIZE - f->buf_index;
 509         if (l > size)
 510             l = size;
 511         memcpy(f->buf + f->buf_index, buf, l);
 512         f->is_write = 1;
 513         f->buf_index += l;
 514         buf += l;
 515         size -= l;
 516         if (f->buf_index >= IO_BUF_SIZE)
 517             qemu_fflush(f);
 518     }
 519 }
 520
 521 void qemu_put_byte(QEMUFile *f, int v)
 522 {
 523     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 524         fprintf(stderr,
 525                 "Attempted to write to buffer while read buffer is not empty\n");
 526         abort();
 527     }
 528
 529     f->buf[f->buf_index++] = v;
 530     f->is_write = 1;
 531     if (f->buf_index >= IO_BUF_SIZE)
 532         qemu_fflush(f);
 533 }
 534
 535 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 536 {
 537     int size, l;
 538
 539     if (f->is_write)
 540         abort();
 541
 542     size = size1;
 543     while (size > 0) {
 544         l = f->buf_size - f->buf_index;
 545         if (l == 0) {
 546             qemu_fill_buffer(f);
 547             l = f->buf_size - f->buf_index;
 548             if (l == 0)
 549                 break;
 550         }
 551         if (l > size)
 552             l = size;
 553         memcpy(buf, f->buf + f->buf_index, l);
 554         f->buf_index += l;
 555         buf += l;
 556         size -= l;
 557     }
 558     return size1 - size;
 559 }
 560
 561 static int qemu_peek_byte(QEMUFile *f)
 562 {
 563     if (f->is_write)
 564         abort();
 565
 566     if (f->buf_index >= f->buf_size) {
 567         qemu_fill_buffer(f);
 568         if (f->buf_index >= f->buf_size)
 569             return 0;
 570     }
 571     return f->buf[f->buf_index];
 572 }
 573
 574 int qemu_get_byte(QEMUFile *f)
 575 {
 576     if (f->is_write)
 577         abort();
 578
 579     if (f->buf_index >= f->buf_size) {
 580         qemu_fill_buffer(f);
 581         if (f->buf_index >= f->buf_size)
 582             return 0;
 583     }
 584     return f->buf[f->buf_index++];
 585 }
 586
 587 int64_t qemu_ftell(QEMUFile *f)
 588 {
 589     return f->buf_offset - f->buf_size + f->buf_index;
 590 }
 591
 592 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 593 {
 594     if (whence == SEEK_SET) {
 595         /* nothing to do */
 596     } else if (whence == SEEK_CUR) {
 597         pos += qemu_ftell(f);
 598     } else {
 599         /* SEEK_END not supported */
 600         return -1;
 601     }
 602     if (f->put_buffer) {
 603         qemu_fflush(f);
 604         f->buf_offset = pos;
 605     } else {
 606         f->buf_offset = pos;
 607         f->buf_index = 0;
 608         f->buf_size = 0;
 609     }
 610     return pos;
 611 }
 612
 613 int qemu_file_rate_limit(QEMUFile *f)
 614 {
 615     if (f->rate_limit)
 616         return f->rate_limit(f->opaque);
 617
 618     return 0;
 619 }
 620
 621 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 622 {
 623     if (f->get_rate_limit)
 624         return f->get_rate_limit(f->opaque);
 625
 626     return 0;
 627 }
 628
 629 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 630 {
 631     /* any failed or completed migration keeps its state to allow probing of
 632      * migration data, but has no associated file anymore */
 633     if (f && f->set_rate_limit)
 634         return f->set_rate_limit(f->opaque, new_rate);
 635
 636     return 0;
 637 }
 638
 639 void qemu_put_be16(QEMUFile *f, unsigned int v)
 640 {
 641     qemu_put_byte(f, v >> 8);
 642     qemu_put_byte(f, v);
 643 }
 644
 645 void qemu_put_be32(QEMUFile *f, unsigned int v)
 646 {
 647     qemu_put_byte(f, v >> 24);
 648     qemu_put_byte(f, v >> 16);
 649     qemu_put_byte(f, v >> 8);
 650     qemu_put_byte(f, v);
 651 }
 652
 653 void qemu_put_be64(QEMUFile *f, uint64_t v)
 654 {
 655     qemu_put_be32(f, v >> 32);
 656     qemu_put_be32(f, v);
 657 }
 658
 659 unsigned int qemu_get_be16(QEMUFile *f)
 660 {
 661     unsigned int v;
 662     v = qemu_get_byte(f) << 8;
 663     v |= qemu_get_byte(f);
 664     return v;
 665 }
 666
 667 unsigned int qemu_get_be32(QEMUFile *f)
 668 {
 669     unsigned int v;
 670     v = qemu_get_byte(f) << 24;
 671     v |= qemu_get_byte(f) << 16;
 672     v |= qemu_get_byte(f) << 8;
 673     v |= qemu_get_byte(f);
 674     return v;
 675 }
 676
 677 uint64_t qemu_get_be64(QEMUFile *f)
 678 {
 679     uint64_t v;
 680     v = (uint64_t)qemu_get_be32(f) << 32;
 681     v |= qemu_get_be32(f);
 682     return v;
 683 }
 684
 685 /* bool */
 686
 687 static int get_bool(QEMUFile *f, void *pv, size_t size)
 688 {
 689     bool *v = pv;
 690     *v = qemu_get_byte(f);
 691     return 0;
 692 }
 693
 694 static void put_bool(QEMUFile *f, void *pv, size_t size)
 695 {
 696     bool *v = pv;
 697     qemu_put_byte(f, *v);
 698 }
 699
 700 const VMStateInfo vmstate_info_bool = {
 701     .name = "bool",
 702     .get  = get_bool,
 703     .put  = put_bool,
 704 };
 705
 706 /* 8 bit int */
 707
 708 static int get_int8(QEMUFile *f, void *pv, size_t size)
 709 {
 710     int8_t *v = pv;
 711     qemu_get_s8s(f, v);
 712     return 0;
 713 }
 714
 715 static void put_int8(QEMUFile *f, void *pv, size_t size)
 716 {
 717     int8_t *v = pv;
 718     qemu_put_s8s(f, v);
 719 }
 720
 721 const VMStateInfo vmstate_info_int8 = {
 722     .name = "int8",
 723     .get  = get_int8,
 724     .put  = put_int8,
 725 };
 726
 727 /* 16 bit int */
 728
 729 static int get_int16(QEMUFile *f, void *pv, size_t size)
 730 {
 731     int16_t *v = pv;
 732     qemu_get_sbe16s(f, v);
 733     return 0;
 734 }
 735
 736 static void put_int16(QEMUFile *f, void *pv, size_t size)
 737 {
 738     int16_t *v = pv;
 739     qemu_put_sbe16s(f, v);
 740 }
 741
 742 const VMStateInfo vmstate_info_int16 = {
 743     .name = "int16",
 744     .get  = get_int16,
 745     .put  = put_int16,
 746 };
 747
 748 /* 32 bit int */
 749
 750 static int get_int32(QEMUFile *f, void *pv, size_t size)
 751 {
 752     int32_t *v = pv;
 753     qemu_get_sbe32s(f, v);
 754     return 0;
 755 }
 756
 757 static void put_int32(QEMUFile *f, void *pv, size_t size)
 758 {
 759     int32_t *v = pv;
 760     qemu_put_sbe32s(f, v);
 761 }
 762
 763 const VMStateInfo vmstate_info_int32 = {
 764     .name = "int32",
 765     .get  = get_int32,
 766     .put  = put_int32,
 767 };
 768
 769 /* 32 bit int. See that the received value is the same than the one
 770    in the field */
 771
 772 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 773 {
 774     int32_t *v = pv;
 775     int32_t v2;
 776     qemu_get_sbe32s(f, &v2);
 777
 778     if (*v == v2)
 779         return 0;
 780     return -EINVAL;
 781 }
 782
 783 const VMStateInfo vmstate_info_int32_equal = {
 784     .name = "int32 equal",
 785     .get  = get_int32_equal,
 786     .put  = put_int32,
 787 };
 788
 789 /* 32 bit int. See that the received value is the less or the same
 790    than the one in the field */
 791
 792 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 793 {
 794     int32_t *old = pv;
 795     int32_t new;
 796     qemu_get_sbe32s(f, &new);
 797
 798     if (*old <= new)
 799         return 0;
 800     return -EINVAL;
 801 }
 802
 803 const VMStateInfo vmstate_info_int32_le = {
 804     .name = "int32 equal",
 805     .get  = get_int32_le,
 806     .put  = put_int32,
 807 };
 808
 809 /* 64 bit int */
 810
 811 static int get_int64(QEMUFile *f, void *pv, size_t size)
 812 {
 813     int64_t *v = pv;
 814     qemu_get_sbe64s(f, v);
 815     return 0;
 816 }
 817
 818 static void put_int64(QEMUFile *f, void *pv, size_t size)
 819 {
 820     int64_t *v = pv;
 821     qemu_put_sbe64s(f, v);
 822 }
 823
 824 const VMStateInfo vmstate_info_int64 = {
 825     .name = "int64",
 826     .get  = get_int64,
 827     .put  = put_int64,
 828 };
 829
 830 /* 8 bit unsigned int */
 831
 832 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 833 {
 834     uint8_t *v = pv;
 835     qemu_get_8s(f, v);
 836     return 0;
 837 }
 838
 839 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 840 {
 841     uint8_t *v = pv;
 842     qemu_put_8s(f, v);
 843 }
 844
 845 const VMStateInfo vmstate_info_uint8 = {
 846     .name = "uint8",
 847     .get  = get_uint8,
 848     .put  = put_uint8,
 849 };
 850
 851 /* 16 bit unsigned int */
 852
 853 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 854 {
 855     uint16_t *v = pv;
 856     qemu_get_be16s(f, v);
 857     return 0;
 858 }
 859
 860 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 861 {
 862     uint16_t *v = pv;
 863     qemu_put_be16s(f, v);
 864 }
 865
 866 const VMStateInfo vmstate_info_uint16 = {
 867     .name = "uint16",
 868     .get  = get_uint16,
 869     .put  = put_uint16,
 870 };
 871
 872 /* 32 bit unsigned int */
 873
 874 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 875 {
 876     uint32_t *v = pv;
 877     qemu_get_be32s(f, v);
 878     return 0;
 879 }
 880
 881 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 882 {
 883     uint32_t *v = pv;
 884     qemu_put_be32s(f, v);
 885 }
 886
 887 const VMStateInfo vmstate_info_uint32 = {
 888     .name = "uint32",
 889     .get  = get_uint32,
 890     .put  = put_uint32,
 891 };
 892
 893 /* 32 bit uint. See that the received value is the same than the one
 894    in the field */
 895
 896 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 897 {
 898     uint32_t *v = pv;
 899     uint32_t v2;
 900     qemu_get_be32s(f, &v2);
 901
 902     if (*v == v2) {
 903         return 0;
 904     }
 905     return -EINVAL;
 906 }
 907
 908 const VMStateInfo vmstate_info_uint32_equal = {
 909     .name = "uint32 equal",
 910     .get  = get_uint32_equal,
 911     .put  = put_uint32,
 912 };
 913
 914 /* 64 bit unsigned int */
 915
 916 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 917 {
 918     uint64_t *v = pv;
 919     qemu_get_be64s(f, v);
 920     return 0;
 921 }
 922
 923 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 924 {
 925     uint64_t *v = pv;
 926     qemu_put_be64s(f, v);
 927 }
 928
 929 const VMStateInfo vmstate_info_uint64 = {
 930     .name = "uint64",
 931     .get  = get_uint64,
 932     .put  = put_uint64,
 933 };
 934
 935 /* 8 bit int. See that the received value is the same than the one
 936    in the field */
 937
 938 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 939 {
 940     uint8_t *v = pv;
 941     uint8_t v2;
 942     qemu_get_8s(f, &v2);
 943
 944     if (*v == v2)
 945         return 0;
 946     return -EINVAL;
 947 }
 948
 949 const VMStateInfo vmstate_info_uint8_equal = {
 950     .name = "uint8 equal",
 951     .get  = get_uint8_equal,
 952     .put  = put_uint8,
 953 };
 954
 955 /* 16 bit unsigned int int. See that the received value is the same than the one
 956    in the field */
 957
 958 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 959 {
 960     uint16_t *v = pv;
 961     uint16_t v2;
 962     qemu_get_be16s(f, &v2);
 963
 964     if (*v == v2)
 965         return 0;
 966     return -EINVAL;
 967 }
 968
 969 const VMStateInfo vmstate_info_uint16_equal = {
 970     .name = "uint16 equal",
 971     .get  = get_uint16_equal,
 972     .put  = put_uint16,
 973 };
 974
 975 /* timers  */
 976
 977 static int get_timer(QEMUFile *f, void *pv, size_t size)
 978 {
 979     QEMUTimer *v = pv;
 980     qemu_get_timer(f, v);
 981     return 0;
 982 }
 983
 984 static void put_timer(QEMUFile *f, void *pv, size_t size)
 985 {
 986     QEMUTimer *v = pv;
 987     qemu_put_timer(f, v);
 988 }
 989
 990 const VMStateInfo vmstate_info_timer = {
 991     .name = "timer",
 992     .get  = get_timer,
 993     .put  = put_timer,
 994 };
 995
 996 /* uint8_t buffers */
 997
 998 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 999 {
1000     uint8_t *v = pv;
1001     qemu_get_buffer(f, v, size);
1002     return 0;
1003 }
1004
1005 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1006 {
1007     uint8_t *v = pv;
1008     qemu_put_buffer(f, v, size);
1009 }
1010
1011 const VMStateInfo vmstate_info_buffer = {
1012     .name = "buffer",
1013     .get  = get_buffer,
1014     .put  = put_buffer,
1015 };
1016
1017 /* unused buffers: space that was used for some fields that are
1018    not useful anymore */
1019
1020 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1021 {
1022     uint8_t buf[1024];
1023     int block_len;
1024
1025     while (size > 0) {
1026         block_len = MIN(sizeof(buf), size);
1027         size -= block_len;
1028         qemu_get_buffer(f, buf, block_len);
1029     }
1030    return 0;
1031 }
1032
1033 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1034 {
1035     static const uint8_t buf[1024];
1036     int block_len;
1037
1038     while (size > 0) {
1039         block_len = MIN(sizeof(buf), size);
1040         size -= block_len;
1041         qemu_put_buffer(f, buf, block_len);
1042     }
1043 }
1044
1045 const VMStateInfo vmstate_info_unused_buffer = {
1046     .name = "unused_buffer",
1047     .get  = get_unused_buffer,
1048     .put  = put_unused_buffer,
1049 };
1050
1051 typedef struct CompatEntry {
1052     char idstr[256];
1053     int instance_id;
1054 } CompatEntry;
1055
1056 typedef struct SaveStateEntry {
1057     QTAILQ_ENTRY(SaveStateEntry) entry;
1058     char idstr[256];
1059     int instance_id;
1060     int alias_id;
1061     int version_id;
1062     int section_id;
1063     SaveSetParamsHandler *set_params;
1064     SaveLiveStateHandler *save_live_state;
1065     SaveStateHandler *save_state;
1066     LoadStateHandler *load_state;
1067     const VMStateDescription *vmsd;
1068     void *opaque;
1069     CompatEntry *compat;
1070     int no_migrate;
1071 } SaveStateEntry;
1072
1073
1074 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1075     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1076 static int global_section_id;
1077
1078 static int calculate_new_instance_id(const char *idstr)
1079 {
1080     SaveStateEntry *se;
1081     int instance_id = 0;
1082
1083     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1084         if (strcmp(idstr, se->idstr) == 0
1085             && instance_id <= se->instance_id) {
1086             instance_id = se->instance_id + 1;
1087         }
1088     }
1089     return instance_id;
1090 }
1091
1092 static int calculate_compat_instance_id(const char *idstr)
1093 {
1094     SaveStateEntry *se;
1095     int instance_id = 0;
1096
1097     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1098         if (!se->compat)
1099             continue;
1100
1101         if (strcmp(idstr, se->compat->idstr) == 0
1102             && instance_id <= se->compat->instance_id) {
1103             instance_id = se->compat->instance_id + 1;
1104         }
1105     }
1106     return instance_id;
1107 }
1108
1109 /* TODO: Individual devices generally have very little idea about the rest
1110    of the system, so instance_id should be removed/replaced.
1111    Meanwhile pass -1 as instance_id if you do not already have a clearly
1112    distinguishing id for all instances of your device class. */
1113 int register_savevm_live(DeviceState *dev,
1114                          const char *idstr,
1115                          int instance_id,
1116                          int version_id,
1117                          SaveSetParamsHandler *set_params,
1118                          SaveLiveStateHandler *save_live_state,
1119                          SaveStateHandler *save_state,
1120                          LoadStateHandler *load_state,
1121                          void *opaque)
1122 {
1123     SaveStateEntry *se;
1124
1125     se = g_malloc0(sizeof(SaveStateEntry));
1126     se->version_id = version_id;
1127     se->section_id = global_section_id++;
1128     se->set_params = set_params;
1129     se->save_live_state = save_live_state;
1130     se->save_state = save_state;
1131     se->load_state = load_state;
1132     se->opaque = opaque;
1133     se->vmsd = NULL;
1134     se->no_migrate = 0;
1135
1136     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1137         char *id = dev->parent_bus->info->get_dev_path(dev);
1138         if (id) {
1139             pstrcpy(se->idstr, sizeof(se->idstr), id);
1140             pstrcat(se->idstr, sizeof(se->idstr), "/");
1141             g_free(id);
1142
1143             se->compat = g_malloc0(sizeof(CompatEntry));
1144             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1145             se->compat->instance_id = instance_id == -1 ?
1146                          calculate_compat_instance_id(idstr) : instance_id;
1147             instance_id = -1;
1148         }
1149     }
1150     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1151
1152     if (instance_id == -1) {
1153         se->instance_id = calculate_new_instance_id(se->idstr);
1154     } else {
1155         se->instance_id = instance_id;
1156     }
1157     assert(!se->compat || se->instance_id == 0);
1158     /* add at the end of list */
1159     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1160     return 0;
1161 }
1162
1163 int register_savevm(DeviceState *dev,
1164                     const char *idstr,
1165                     int instance_id,
1166                     int version_id,
1167                     SaveStateHandler *save_state,
1168                     LoadStateHandler *load_state,
1169                     void *opaque)
1170 {
1171     return register_savevm_live(dev, idstr, instance_id, version_id,
1172                                 NULL, NULL, save_state, load_state, opaque);
1173 }
1174
1175 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1176 {
1177     SaveStateEntry *se, *new_se;
1178     char id[256] = "";
1179
1180     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1181         char *path = dev->parent_bus->info->get_dev_path(dev);
1182         if (path) {
1183             pstrcpy(id, sizeof(id), path);
1184             pstrcat(id, sizeof(id), "/");
1185             g_free(path);
1186         }
1187     }
1188     pstrcat(id, sizeof(id), idstr);
1189
1190     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1191         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1192             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1193             if (se->compat) {
1194                 g_free(se->compat);
1195             }
1196             g_free(se);
1197         }
1198     }
1199 }
1200
1201 /* mark a device as not to be migrated, that is the device should be
1202    unplugged before migration */
1203 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1204                                                             void *opaque)
1205 {
1206     SaveStateEntry *se;
1207     char id[256] = "";
1208
1209     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1210         char *path = dev->parent_bus->info->get_dev_path(dev);
1211         if (path) {
1212             pstrcpy(id, sizeof(id), path);
1213             pstrcat(id, sizeof(id), "/");
1214             g_free(path);
1215         }
1216     }
1217     pstrcat(id, sizeof(id), idstr);
1218
1219     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1220         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1221             se->no_migrate = 1;
1222         }
1223     }
1224 }
1225
1226 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1227                                    const VMStateDescription *vmsd,
1228                                    void *opaque, int alias_id,
1229                                    int required_for_version)
1230 {
1231     SaveStateEntry *se;
1232
1233     /* If this triggers, alias support can be dropped for the vmsd. */
1234     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1235
1236     se = g_malloc0(sizeof(SaveStateEntry));
1237     se->version_id = vmsd->version_id;
1238     se->section_id = global_section_id++;
1239     se->save_live_state = NULL;
1240     se->save_state = NULL;
1241     se->load_state = NULL;
1242     se->opaque = opaque;
1243     se->vmsd = vmsd;
1244     se->alias_id = alias_id;
1245     se->no_migrate = vmsd->unmigratable;
1246
1247     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1248         char *id = dev->parent_bus->info->get_dev_path(dev);
1249         if (id) {
1250             pstrcpy(se->idstr, sizeof(se->idstr), id);
1251             pstrcat(se->idstr, sizeof(se->idstr), "/");
1252             g_free(id);
1253
1254             se->compat = g_malloc0(sizeof(CompatEntry));
1255             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1256             se->compat->instance_id = instance_id == -1 ?
1257                          calculate_compat_instance_id(vmsd->name) : instance_id;
1258             instance_id = -1;
1259         }
1260     }
1261     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1262
1263     if (instance_id == -1) {
1264         se->instance_id = calculate_new_instance_id(se->idstr);
1265     } else {
1266         se->instance_id = instance_id;
1267     }
1268     assert(!se->compat || se->instance_id == 0);
1269     /* add at the end of list */
1270     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1271     return 0;
1272 }
1273
1274 int vmstate_register(DeviceState *dev, int instance_id,
1275                      const VMStateDescription *vmsd, void *opaque)
1276 {
1277     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1278                                           opaque, -1, 0);
1279 }
1280
1281 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1282                         void *opaque)
1283 {
1284     SaveStateEntry *se, *new_se;
1285
1286     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1287         if (se->vmsd == vmsd && se->opaque == opaque) {
1288             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1289             if (se->compat) {
1290                 g_free(se->compat);
1291             }
1292             g_free(se);
1293         }
1294     }
1295 }
1296
1297 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1298                                     void *opaque);
1299 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1300                                    void *opaque);
1301
1302 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1303                        void *opaque, int version_id)
1304 {
1305     VMStateField *field = vmsd->fields;
1306     int ret;
1307
1308     if (version_id > vmsd->version_id) {
1309         return -EINVAL;
1310     }
1311     if (version_id < vmsd->minimum_version_id_old) {
1312         return -EINVAL;
1313     }
1314     if  (version_id < vmsd->minimum_version_id) {
1315         return vmsd->load_state_old(f, opaque, version_id);
1316     }
1317     if (vmsd->pre_load) {
1318         int ret = vmsd->pre_load(opaque);
1319         if (ret)
1320             return ret;
1321     }
1322     while(field->name) {
1323         if ((field->field_exists &&
1324              field->field_exists(opaque, version_id)) ||
1325             (!field->field_exists &&
1326              field->version_id <= version_id)) {
1327             void *base_addr = opaque + field->offset;
1328             int i, n_elems = 1;
1329             int size = field->size;
1330
1331             if (field->flags & VMS_VBUFFER) {
1332                 size = *(int32_t *)(opaque+field->size_offset);
1333                 if (field->flags & VMS_MULTIPLY) {
1334                     size *= field->size;
1335                 }
1336             }
1337             if (field->flags & VMS_ARRAY) {
1338                 n_elems = field->num;
1339             } else if (field->flags & VMS_VARRAY_INT32) {
1340                 n_elems = *(int32_t *)(opaque+field->num_offset);
1341             } else if (field->flags & VMS_VARRAY_UINT32) {
1342                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1343             } else if (field->flags & VMS_VARRAY_UINT16) {
1344                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1345             } else if (field->flags & VMS_VARRAY_UINT8) {
1346                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1347             }
1348             if (field->flags & VMS_POINTER) {
1349                 base_addr = *(void **)base_addr + field->start;
1350             }
1351             for (i = 0; i < n_elems; i++) {
1352                 void *addr = base_addr + size * i;
1353
1354                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1355                     addr = *(void **)addr;
1356                 }
1357                 if (field->flags & VMS_STRUCT) {
1358                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1359                 } else {
1360                     ret = field->info->get(f, addr, size);
1361
1362                 }
1363                 if (ret < 0) {
1364                     return ret;
1365                 }
1366             }
1367         }
1368         field++;
1369     }
1370     ret = vmstate_subsection_load(f, vmsd, opaque);
1371     if (ret != 0) {
1372         return ret;
1373     }
1374     if (vmsd->post_load) {
1375         return vmsd->post_load(opaque, version_id);
1376     }
1377     return 0;
1378 }
1379
1380 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1381                         void *opaque)
1382 {
1383     VMStateField *field = vmsd->fields;
1384
1385     if (vmsd->pre_save) {
1386         vmsd->pre_save(opaque);
1387     }
1388     while(field->name) {
1389         if (!field->field_exists ||
1390             field->field_exists(opaque, vmsd->version_id)) {
1391             void *base_addr = opaque + field->offset;
1392             int i, n_elems = 1;
1393             int size = field->size;
1394
1395             if (field->flags & VMS_VBUFFER) {
1396                 size = *(int32_t *)(opaque+field->size_offset);
1397                 if (field->flags & VMS_MULTIPLY) {
1398                     size *= field->size;
1399                 }
1400             }
1401             if (field->flags & VMS_ARRAY) {
1402                 n_elems = field->num;
1403             } else if (field->flags & VMS_VARRAY_INT32) {
1404                 n_elems = *(int32_t *)(opaque+field->num_offset);
1405             } else if (field->flags & VMS_VARRAY_UINT16) {
1406                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1407             } else if (field->flags & VMS_VARRAY_UINT8) {
1408                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1409             }
1410             if (field->flags & VMS_POINTER) {
1411                 base_addr = *(void **)base_addr + field->start;
1412             }
1413             for (i = 0; i < n_elems; i++) {
1414                 void *addr = base_addr + size * i;
1415
1416                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1417                     addr = *(void **)addr;
1418                 }
1419                 if (field->flags & VMS_STRUCT) {
1420                     vmstate_save_state(f, field->vmsd, addr);
1421                 } else {
1422                     field->info->put(f, addr, size);
1423                 }
1424             }
1425         }
1426         field++;
1427     }
1428     vmstate_subsection_save(f, vmsd, opaque);
1429 }
1430
1431 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1432 {
1433     if (!se->vmsd) {         /* Old style */
1434         return se->load_state(f, se->opaque, version_id);
1435     }
1436     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1437 }
1438
1439 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1440 {
1441     if (!se->vmsd) {         /* Old style */
1442         se->save_state(f, se->opaque);
1443         return;
1444     }
1445     vmstate_save_state(f,se->vmsd, se->opaque);
1446 }
1447
1448 #define QEMU_VM_FILE_MAGIC           0x5145564d
1449 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1450 #define QEMU_VM_FILE_VERSION         0x00000003
1451
1452 #define QEMU_VM_EOF                  0x00
1453 #define QEMU_VM_SECTION_START        0x01
1454 #define QEMU_VM_SECTION_PART         0x02
1455 #define QEMU_VM_SECTION_END          0x03
1456 #define QEMU_VM_SECTION_FULL         0x04
1457 #define QEMU_VM_SUBSECTION           0x05
1458
1459 bool qemu_savevm_state_blocked(Monitor *mon)
1460 {
1461     SaveStateEntry *se;
1462
1463     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1464         if (se->no_migrate) {
1465             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1466                            se->idstr);
1467             return true;
1468         }
1469     }
1470     return false;
1471 }
1472
1473 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1474                             int shared)
1475 {
1476     SaveStateEntry *se;
1477
1478     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1479         if(se->set_params == NULL) {
1480             continue;
1481         }
1482         se->set_params(blk_enable, shared, se->opaque);
1483     }
1484
1485     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1486     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1487
1488     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1489         int len;
1490
1491         if (se->save_live_state == NULL)
1492             continue;
1493
1494         /* Section type */
1495         qemu_put_byte(f, QEMU_VM_SECTION_START);
1496         qemu_put_be32(f, se->section_id);
1497
1498         /* ID string */
1499         len = strlen(se->idstr);
1500         qemu_put_byte(f, len);
1501         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1502
1503         qemu_put_be32(f, se->instance_id);
1504         qemu_put_be32(f, se->version_id);
1505
1506         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1507     }
1508
1509     if (qemu_file_has_error(f)) {
1510         qemu_savevm_state_cancel(mon, f);
1511         return -EIO;
1512     }
1513
1514     return 0;
1515 }
1516
1517 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1518 {
1519     SaveStateEntry *se;
1520     int ret = 1;
1521
1522     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1523         if (se->save_live_state == NULL)
1524             continue;
1525
1526         /* Section type */
1527         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1528         qemu_put_be32(f, se->section_id);
1529
1530         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1531         if (!ret) {
1532             /* Do not proceed to the next vmstate before this one reported
1533                completion of the current stage. This serializes the migration
1534                and reduces the probability that a faster changing state is
1535                synchronized over and over again. */
1536             break;
1537         }
1538     }
1539
1540     if (ret)
1541         return 1;
1542
1543     if (qemu_file_has_error(f)) {
1544         qemu_savevm_state_cancel(mon, f);
1545         return -EIO;
1546     }
1547
1548     return 0;
1549 }
1550
1551 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1552 {
1553     SaveStateEntry *se;
1554
1555     cpu_synchronize_all_states();
1556
1557     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1558         if (se->save_live_state == NULL)
1559             continue;
1560
1561         /* Section type */
1562         qemu_put_byte(f, QEMU_VM_SECTION_END);
1563         qemu_put_be32(f, se->section_id);
1564
1565         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1566     }
1567
1568     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1569         int len;
1570
1571         if (se->save_state == NULL && se->vmsd == NULL)
1572             continue;
1573
1574         /* Section type */
1575         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1576         qemu_put_be32(f, se->section_id);
1577
1578         /* ID string */
1579         len = strlen(se->idstr);
1580         qemu_put_byte(f, len);
1581         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1582
1583         qemu_put_be32(f, se->instance_id);
1584         qemu_put_be32(f, se->version_id);
1585
1586         vmstate_save(f, se);
1587     }
1588
1589     qemu_put_byte(f, QEMU_VM_EOF);
1590
1591     if (qemu_file_has_error(f))
1592         return -EIO;
1593
1594     return 0;
1595 }
1596
1597 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1598 {
1599     SaveStateEntry *se;
1600
1601     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1602         if (se->save_live_state) {
1603             se->save_live_state(mon, f, -1, se->opaque);
1604         }
1605     }
1606 }
1607
1608 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1609 {
1610     int saved_vm_running;
1611     int ret;
1612
1613     saved_vm_running = runstate_is_running();
1614     vm_stop(RUN_STATE_SAVE_VM);
1615
1616     if (qemu_savevm_state_blocked(mon)) {
1617         ret = -EINVAL;
1618         goto out;
1619     }
1620
1621     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1622     if (ret < 0)
1623         goto out;
1624
1625     do {
1626         ret = qemu_savevm_state_iterate(mon, f);
1627         if (ret < 0)
1628             goto out;
1629     } while (ret == 0);
1630
1631     ret = qemu_savevm_state_complete(mon, f);
1632
1633 out:
1634     if (qemu_file_has_error(f))
1635         ret = -EIO;
1636
1637     if (!ret && saved_vm_running)
1638         vm_start();
1639
1640     return ret;
1641 }
1642
1643 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1644 {
1645     SaveStateEntry *se;
1646
1647     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1648         if (!strcmp(se->idstr, idstr) &&
1649             (instance_id == se->instance_id ||
1650              instance_id == se->alias_id))
1651             return se;
1652         /* Migrating from an older version? */
1653         if (strstr(se->idstr, idstr) && se->compat) {
1654             if (!strcmp(se->compat->idstr, idstr) &&
1655                 (instance_id == se->compat->instance_id ||
1656                  instance_id == se->alias_id))
1657                 return se;
1658         }
1659     }
1660     return NULL;
1661 }
1662
1663 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1664 {
1665     while(sub && sub->needed) {
1666         if (strcmp(idstr, sub->vmsd->name) == 0) {
1667             return sub->vmsd;
1668         }
1669         sub++;
1670     }
1671     return NULL;
1672 }
1673
1674 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1675                                    void *opaque)
1676 {
1677     const VMStateSubsection *sub = vmsd->subsections;
1678
1679     if (!sub || !sub->needed) {
1680         return 0;
1681     }
1682
1683     while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1684         char idstr[256];
1685         int ret;
1686         uint8_t version_id, len;
1687         const VMStateDescription *sub_vmsd;
1688
1689         qemu_get_byte(f); /* subsection */
1690         len = qemu_get_byte(f);
1691         qemu_get_buffer(f, (uint8_t *)idstr, len);
1692         idstr[len] = 0;
1693         version_id = qemu_get_be32(f);
1694
1695         sub_vmsd = vmstate_get_subsection(sub, idstr);
1696         if (sub_vmsd == NULL) {
1697             return -ENOENT;
1698         }
1699         assert(!sub_vmsd->subsections);
1700         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1701         if (ret) {
1702             return ret;
1703         }
1704     }
1705     return 0;
1706 }
1707
1708 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1709                                     void *opaque)
1710 {
1711     const VMStateSubsection *sub = vmsd->subsections;
1712
1713     while (sub && sub->needed) {
1714         if (sub->needed(opaque)) {
1715             const VMStateDescription *vmsd = sub->vmsd;
1716             uint8_t len;
1717
1718             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1719             len = strlen(vmsd->name);
1720             qemu_put_byte(f, len);
1721             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1722             qemu_put_be32(f, vmsd->version_id);
1723             assert(!vmsd->subsections);
1724             vmstate_save_state(f, vmsd, opaque);
1725         }
1726         sub++;
1727     }
1728 }
1729
1730 typedef struct LoadStateEntry {
1731     QLIST_ENTRY(LoadStateEntry) entry;
1732     SaveStateEntry *se;
1733     int section_id;
1734     int version_id;
1735 } LoadStateEntry;
1736
1737 int qemu_loadvm_state(QEMUFile *f)
1738 {
1739     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1740         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1741     LoadStateEntry *le, *new_le;
1742     uint8_t section_type;
1743     unsigned int v;
1744     int ret;
1745
1746     if (qemu_savevm_state_blocked(default_mon)) {
1747         return -EINVAL;
1748     }
1749
1750     v = qemu_get_be32(f);
1751     if (v != QEMU_VM_FILE_MAGIC)
1752         return -EINVAL;
1753
1754     v = qemu_get_be32(f);
1755     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1756         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1757         return -ENOTSUP;
1758     }
1759     if (v != QEMU_VM_FILE_VERSION)
1760         return -ENOTSUP;
1761
1762     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1763         uint32_t instance_id, version_id, section_id;
1764         SaveStateEntry *se;
1765         char idstr[257];
1766         int len;
1767
1768         switch (section_type) {
1769         case QEMU_VM_SECTION_START:
1770         case QEMU_VM_SECTION_FULL:
1771             /* Read section start */
1772             section_id = qemu_get_be32(f);
1773             len = qemu_get_byte(f);
1774             qemu_get_buffer(f, (uint8_t *)idstr, len);
1775             idstr[len] = 0;
1776             instance_id = qemu_get_be32(f);
1777             version_id = qemu_get_be32(f);
1778
1779             /* Find savevm section */
1780             se = find_se(idstr, instance_id);
1781             if (se == NULL) {
1782                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1783                 ret = -EINVAL;
1784                 goto out;
1785             }
1786
1787             /* Validate version */
1788             if (version_id > se->version_id) {
1789                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1790                         version_id, idstr, se->version_id);
1791                 ret = -EINVAL;
1792                 goto out;
1793             }
1794
1795             /* Add entry */
1796             le = g_malloc0(sizeof(*le));
1797
1798             le->se = se;
1799             le->section_id = section_id;
1800             le->version_id = version_id;
1801             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1802
1803             ret = vmstate_load(f, le->se, le->version_id);
1804             if (ret < 0) {
1805                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1806                         instance_id, idstr);
1807                 goto out;
1808             }
1809             break;
1810         case QEMU_VM_SECTION_PART:
1811         case QEMU_VM_SECTION_END:
1812             section_id = qemu_get_be32(f);
1813
1814             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1815                 if (le->section_id == section_id) {
1816                     break;
1817                 }
1818             }
1819             if (le == NULL) {
1820                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1821                 ret = -EINVAL;
1822                 goto out;
1823             }
1824
1825             ret = vmstate_load(f, le->se, le->version_id);
1826             if (ret < 0) {
1827                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1828                         section_id);
1829                 goto out;
1830             }
1831             break;
1832         default:
1833             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1834             ret = -EINVAL;
1835             goto out;
1836         }
1837     }
1838
1839     cpu_synchronize_all_post_init();
1840
1841     ret = 0;
1842
1843 out:
1844     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1845         QLIST_REMOVE(le, entry);
1846         g_free(le);
1847     }
1848
1849     if (qemu_file_has_error(f))
1850         ret = -EIO;
1851
1852     return ret;
1853 }
1854
1855 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1856                               const char *name)
1857 {
1858     QEMUSnapshotInfo *sn_tab, *sn;
1859     int nb_sns, i, ret;
1860
1861     ret = -ENOENT;
1862     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1863     if (nb_sns < 0)
1864         return ret;
1865     for(i = 0; i < nb_sns; i++) {
1866         sn = &sn_tab[i];
1867         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1868             *sn_info = *sn;
1869             ret = 0;
1870             break;
1871         }
1872     }
1873     g_free(sn_tab);
1874     return ret;
1875 }
1876
1877 /*
1878  * Deletes snapshots of a given name in all opened images.
1879  */
1880 static int del_existing_snapshots(Monitor *mon, const char *name)
1881 {
1882     BlockDriverState *bs;
1883     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1884     int ret;
1885
1886     bs = NULL;
1887     while ((bs = bdrv_next(bs))) {
1888         if (bdrv_can_snapshot(bs) &&
1889             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1890         {
1891             ret = bdrv_snapshot_delete(bs, name);
1892             if (ret < 0) {
1893                 monitor_printf(mon,
1894                                "Error while deleting snapshot on '%s'\n",
1895                                bdrv_get_device_name(bs));
1896                 return -1;
1897             }
1898         }
1899     }
1900
1901     return 0;
1902 }
1903
1904 void do_savevm(Monitor *mon, const QDict *qdict)
1905 {
1906     BlockDriverState *bs, *bs1;
1907     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1908     int ret;
1909     QEMUFile *f;
1910     int saved_vm_running;
1911     uint32_t vm_state_size;
1912 #ifdef _WIN32
1913     struct _timeb tb;
1914     struct tm *ptm;
1915 #else
1916     struct timeval tv;
1917     struct tm tm;
1918 #endif
1919     const char *name = qdict_get_try_str(qdict, "name");
1920
1921     /* Verify if there is a device that doesn't support snapshots and is writable */
1922     bs = NULL;
1923     while ((bs = bdrv_next(bs))) {
1924
1925         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1926             continue;
1927         }
1928
1929         if (!bdrv_can_snapshot(bs)) {
1930             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1931                                bdrv_get_device_name(bs));
1932             return;
1933         }
1934     }
1935
1936     bs = bdrv_snapshots();
1937     if (!bs) {
1938         monitor_printf(mon, "No block device can accept snapshots\n");
1939         return;
1940     }
1941
1942     saved_vm_running = runstate_is_running();
1943     vm_stop(RUN_STATE_SAVE_VM);
1944
1945     memset(sn, 0, sizeof(*sn));
1946
1947     /* fill auxiliary fields */
1948 #ifdef _WIN32
1949     _ftime(&tb);
1950     sn->date_sec = tb.time;
1951     sn->date_nsec = tb.millitm * 1000000;
1952 #else
1953     gettimeofday(&tv, NULL);
1954     sn->date_sec = tv.tv_sec;
1955     sn->date_nsec = tv.tv_usec * 1000;
1956 #endif
1957     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
1958
1959     if (name) {
1960         ret = bdrv_snapshot_find(bs, old_sn, name);
1961         if (ret >= 0) {
1962             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1963             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1964         } else {
1965             pstrcpy(sn->name, sizeof(sn->name), name);
1966         }
1967     } else {
1968 #ifdef _WIN32
1969         ptm = localtime(&tb.time);
1970         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1971 #else
1972         /* cast below needed for OpenBSD where tv_sec is still 'long' */
1973         localtime_r((const time_t *)&tv.tv_sec, &tm);
1974         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1975 #endif
1976     }
1977
1978     /* Delete old snapshots of the same name */
1979     if (name && del_existing_snapshots(mon, name) < 0) {
1980         goto the_end;
1981     }
1982
1983     /* save the VM state */
1984     f = qemu_fopen_bdrv(bs, 1);
1985     if (!f) {
1986         monitor_printf(mon, "Could not open VM state file\n");
1987         goto the_end;
1988     }
1989     ret = qemu_savevm_state(mon, f);
1990     vm_state_size = qemu_ftell(f);
1991     qemu_fclose(f);
1992     if (ret < 0) {
1993         monitor_printf(mon, "Error %d while writing VM\n", ret);
1994         goto the_end;
1995     }
1996
1997     /* create the snapshots */
1998
1999     bs1 = NULL;
2000     while ((bs1 = bdrv_next(bs1))) {
2001         if (bdrv_can_snapshot(bs1)) {
2002             /* Write VM state size only to the image that contains the state */
2003             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2004             ret = bdrv_snapshot_create(bs1, sn);
2005             if (ret < 0) {
2006                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2007                                bdrv_get_device_name(bs1));
2008             }
2009         }
2010     }
2011
2012  the_end:
2013     if (saved_vm_running)
2014         vm_start();
2015 }
2016
2017 int load_vmstate(const char *name)
2018 {
2019     BlockDriverState *bs, *bs_vm_state;
2020     QEMUSnapshotInfo sn;
2021     QEMUFile *f;
2022     int ret;
2023
2024     bs_vm_state = bdrv_snapshots();
2025     if (!bs_vm_state) {
2026         error_report("No block device supports snapshots");
2027         return -ENOTSUP;
2028     }
2029
2030     /* Don't even try to load empty VM states */
2031     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2032     if (ret < 0) {
2033         return ret;
2034     } else if (sn.vm_state_size == 0) {
2035         error_report("This is a disk-only snapshot. Revert to it offline "
2036             "using qemu-img.");
2037         return -EINVAL;
2038     }
2039
2040     /* Verify if there is any device that doesn't support snapshots and is
2041     writable and check if the requested snapshot is available too. */
2042     bs = NULL;
2043     while ((bs = bdrv_next(bs))) {
2044
2045         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2046             continue;
2047         }
2048
2049         if (!bdrv_can_snapshot(bs)) {
2050             error_report("Device '%s' is writable but does not support snapshots.",
2051                                bdrv_get_device_name(bs));
2052             return -ENOTSUP;
2053         }
2054
2055         ret = bdrv_snapshot_find(bs, &sn, name);
2056         if (ret < 0) {
2057             error_report("Device '%s' does not have the requested snapshot '%s'",
2058                            bdrv_get_device_name(bs), name);
2059             return ret;
2060         }
2061     }
2062
2063     /* Flush all IO requests so they don't interfere with the new state.  */
2064     qemu_aio_flush();
2065
2066     bs = NULL;
2067     while ((bs = bdrv_next(bs))) {
2068         if (bdrv_can_snapshot(bs)) {
2069             ret = bdrv_snapshot_goto(bs, name);
2070             if (ret < 0) {
2071                 error_report("Error %d while activating snapshot '%s' on '%s'",
2072                              ret, name, bdrv_get_device_name(bs));
2073                 return ret;
2074             }
2075         }
2076     }
2077
2078     /* restore the VM state */
2079     f = qemu_fopen_bdrv(bs_vm_state, 0);
2080     if (!f) {
2081         error_report("Could not open VM state file");
2082         return -EINVAL;
2083     }
2084
2085     qemu_system_reset(VMRESET_SILENT);
2086     ret = qemu_loadvm_state(f);
2087
2088     qemu_fclose(f);
2089     if (ret < 0) {
2090         error_report("Error %d while loading VM state", ret);
2091         return ret;
2092     }
2093
2094     return 0;
2095 }
2096
2097 void do_delvm(Monitor *mon, const QDict *qdict)
2098 {
2099     BlockDriverState *bs, *bs1;
2100     int ret;
2101     const char *name = qdict_get_str(qdict, "name");
2102
2103     bs = bdrv_snapshots();
2104     if (!bs) {
2105         monitor_printf(mon, "No block device supports snapshots\n");
2106         return;
2107     }
2108
2109     bs1 = NULL;
2110     while ((bs1 = bdrv_next(bs1))) {
2111         if (bdrv_can_snapshot(bs1)) {
2112             ret = bdrv_snapshot_delete(bs1, name);
2113             if (ret < 0) {
2114                 if (ret == -ENOTSUP)
2115                     monitor_printf(mon,
2116                                    "Snapshots not supported on device '%s'\n",
2117                                    bdrv_get_device_name(bs1));
2118                 else
2119                     monitor_printf(mon, "Error %d while deleting snapshot on "
2120                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2121             }
2122         }
2123     }
2124 }
2125
2126 void do_info_snapshots(Monitor *mon)
2127 {
2128     BlockDriverState *bs, *bs1;
2129     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2130     int nb_sns, i, ret, available;
2131     int total;
2132     int *available_snapshots;
2133     char buf[256];
2134
2135     bs = bdrv_snapshots();
2136     if (!bs) {
2137         monitor_printf(mon, "No available block device supports snapshots\n");
2138         return;
2139     }
2140
2141     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2142     if (nb_sns < 0) {
2143         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2144         return;
2145     }
2146
2147     if (nb_sns == 0) {
2148         monitor_printf(mon, "There is no snapshot available.\n");
2149         return;
2150     }
2151
2152     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2153     total = 0;
2154     for (i = 0; i < nb_sns; i++) {
2155         sn = &sn_tab[i];
2156         available = 1;
2157         bs1 = NULL;
2158
2159         while ((bs1 = bdrv_next(bs1))) {
2160             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2161                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2162                 if (ret < 0) {
2163                     available = 0;
2164                     break;
2165                 }
2166             }
2167         }
2168
2169         if (available) {
2170             available_snapshots[total] = i;
2171             total++;
2172         }
2173     }
2174
2175     if (total > 0) {
2176         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2177         for (i = 0; i < total; i++) {
2178             sn = &sn_tab[available_snapshots[i]];
2179             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2180         }
2181     } else {
2182         monitor_printf(mon, "There is no suitable snapshot available\n");
2183     }
2184
2185     g_free(sn_tab);
2186     g_free(available_snapshots);
2187
2188 }