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 <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #include <arpa/inet.h>
  46 #include <dirent.h>
  47 #include <netdb.h>
  48 #include <sys/select.h>
  49 #ifdef CONFIG_BSD
  50 #include <sys/stat.h>
  51 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  52 #include <libutil.h>
  53 #else
  54 #include <util.h>
  55 #endif
  56 #ifdef __linux__
  57 #include <pty.h>
  58 #include <malloc.h>
  59 #include <linux/rtc.h>
  60 #endif
  61 #endif
  62 #endif
  63
  64 #ifdef _WIN32
  65 #include <windows.h>
  66 #include <malloc.h>
  67 #include <sys/timeb.h>
  68 #include <mmsystem.h>
  69 #define getopt_long_only getopt_long
  70 #define memalign(align, size) malloc(size)
  71 #endif
  72
  73 #include "qemu-common.h"
  74 #include "hw/hw.h"
  75 #include "hw/qdev.h"
  76 #include "net.h"
  77 #include "monitor.h"
  78 #include "sysemu.h"
  79 #include "qemu-timer.h"
  80 #include "qemu-char.h"
  81 #include "audio/audio.h"
  82 #include "migration.h"
  83 #include "qemu_socket.h"
  84 #include "qemu-queue.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(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(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 = recv(s->fd, (void *)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     qemu_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     qemu_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     qemu_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 = qemu_mallocz(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 = qemu_mallocz(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     qemu_free(s);
 322     return NULL;
 323 }
 324
 325 QEMUFile *qemu_fopen_socket(int fd)
 326 {
 327     QEMUFileSocket *s = qemu_mallocz(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 = qemu_mallocz(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     qemu_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 = qemu_mallocz(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     qemu_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 usefull 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 = qemu_mallocz(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             qemu_free(id);
1134
1135             se->compat = qemu_mallocz(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             qemu_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                 qemu_free(se->compat);
1187             }
1188             qemu_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             qemu_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 = qemu_mallocz(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
1238     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1239         char *id = dev->parent_bus->info->get_dev_path(dev);
1240         if (id) {
1241             pstrcpy(se->idstr, sizeof(se->idstr), id);
1242             pstrcat(se->idstr, sizeof(se->idstr), "/");
1243             qemu_free(id);
1244
1245             se->compat = qemu_mallocz(sizeof(CompatEntry));
1246             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1247             se->compat->instance_id = instance_id == -1 ?
1248                          calculate_compat_instance_id(vmsd->name) : instance_id;
1249             instance_id = -1;
1250         }
1251     }
1252     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1253
1254     if (instance_id == -1) {
1255         se->instance_id = calculate_new_instance_id(se->idstr);
1256     } else {
1257         se->instance_id = instance_id;
1258     }
1259     assert(!se->compat || se->instance_id == 0);
1260     /* add at the end of list */
1261     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1262     return 0;
1263 }
1264
1265 int vmstate_register(DeviceState *dev, int instance_id,
1266                      const VMStateDescription *vmsd, void *opaque)
1267 {
1268     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1269                                           opaque, -1, 0);
1270 }
1271
1272 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1273                         void *opaque)
1274 {
1275     SaveStateEntry *se, *new_se;
1276
1277     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1278         if (se->vmsd == vmsd && se->opaque == opaque) {
1279             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1280             if (se->compat) {
1281                 qemu_free(se->compat);
1282             }
1283             qemu_free(se);
1284         }
1285     }
1286 }
1287
1288 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1289                                     void *opaque);
1290 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1291                                    void *opaque);
1292
1293 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1294                        void *opaque, int version_id)
1295 {
1296     VMStateField *field = vmsd->fields;
1297     int ret;
1298
1299     if (version_id > vmsd->version_id) {
1300         return -EINVAL;
1301     }
1302     if (version_id < vmsd->minimum_version_id_old) {
1303         return -EINVAL;
1304     }
1305     if  (version_id < vmsd->minimum_version_id) {
1306         return vmsd->load_state_old(f, opaque, version_id);
1307     }
1308     if (vmsd->pre_load) {
1309         int ret = vmsd->pre_load(opaque);
1310         if (ret)
1311             return ret;
1312     }
1313     while(field->name) {
1314         if ((field->field_exists &&
1315              field->field_exists(opaque, version_id)) ||
1316             (!field->field_exists &&
1317              field->version_id <= version_id)) {
1318             void *base_addr = opaque + field->offset;
1319             int i, n_elems = 1;
1320             int size = field->size;
1321
1322             if (field->flags & VMS_VBUFFER) {
1323                 size = *(int32_t *)(opaque+field->size_offset);
1324                 if (field->flags & VMS_MULTIPLY) {
1325                     size *= field->size;
1326                 }
1327             }
1328             if (field->flags & VMS_ARRAY) {
1329                 n_elems = field->num;
1330             } else if (field->flags & VMS_VARRAY_INT32) {
1331                 n_elems = *(int32_t *)(opaque+field->num_offset);
1332             } else if (field->flags & VMS_VARRAY_UINT32) {
1333                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1334             } else if (field->flags & VMS_VARRAY_UINT16) {
1335                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1336             } else if (field->flags & VMS_VARRAY_UINT8) {
1337                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1338             }
1339             if (field->flags & VMS_POINTER) {
1340                 base_addr = *(void **)base_addr + field->start;
1341             }
1342             for (i = 0; i < n_elems; i++) {
1343                 void *addr = base_addr + size * i;
1344
1345                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1346                     addr = *(void **)addr;
1347                 }
1348                 if (field->flags & VMS_STRUCT) {
1349                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1350                 } else {
1351                     ret = field->info->get(f, addr, size);
1352
1353                 }
1354                 if (ret < 0) {
1355                     return ret;
1356                 }
1357             }
1358         }
1359         field++;
1360     }
1361     ret = vmstate_subsection_load(f, vmsd, opaque);
1362     if (ret != 0) {
1363         return ret;
1364     }
1365     if (vmsd->post_load) {
1366         return vmsd->post_load(opaque, version_id);
1367     }
1368     return 0;
1369 }
1370
1371 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1372                         void *opaque)
1373 {
1374     VMStateField *field = vmsd->fields;
1375
1376     if (vmsd->pre_save) {
1377         vmsd->pre_save(opaque);
1378     }
1379     while(field->name) {
1380         if (!field->field_exists ||
1381             field->field_exists(opaque, vmsd->version_id)) {
1382             void *base_addr = opaque + field->offset;
1383             int i, n_elems = 1;
1384             int size = field->size;
1385
1386             if (field->flags & VMS_VBUFFER) {
1387                 size = *(int32_t *)(opaque+field->size_offset);
1388                 if (field->flags & VMS_MULTIPLY) {
1389                     size *= field->size;
1390                 }
1391             }
1392             if (field->flags & VMS_ARRAY) {
1393                 n_elems = field->num;
1394             } else if (field->flags & VMS_VARRAY_INT32) {
1395                 n_elems = *(int32_t *)(opaque+field->num_offset);
1396             } else if (field->flags & VMS_VARRAY_UINT16) {
1397                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1398             }
1399             if (field->flags & VMS_POINTER) {
1400                 base_addr = *(void **)base_addr + field->start;
1401             }
1402             for (i = 0; i < n_elems; i++) {
1403                 void *addr = base_addr + size * i;
1404
1405                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1406                     addr = *(void **)addr;
1407                 }
1408                 if (field->flags & VMS_STRUCT) {
1409                     vmstate_save_state(f, field->vmsd, addr);
1410                 } else {
1411                     field->info->put(f, addr, size);
1412                 }
1413             }
1414         }
1415         field++;
1416     }
1417     vmstate_subsection_save(f, vmsd, opaque);
1418 }
1419
1420 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1421 {
1422     if (!se->vmsd) {         /* Old style */
1423         return se->load_state(f, se->opaque, version_id);
1424     }
1425     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1426 }
1427
1428 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1429 {
1430     if (!se->vmsd) {         /* Old style */
1431         se->save_state(f, se->opaque);
1432         return;
1433     }
1434     vmstate_save_state(f,se->vmsd, se->opaque);
1435 }
1436
1437 #define QEMU_VM_FILE_MAGIC           0x5145564d
1438 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1439 #define QEMU_VM_FILE_VERSION         0x00000003
1440
1441 #define QEMU_VM_EOF                  0x00
1442 #define QEMU_VM_SECTION_START        0x01
1443 #define QEMU_VM_SECTION_PART         0x02
1444 #define QEMU_VM_SECTION_END          0x03
1445 #define QEMU_VM_SECTION_FULL         0x04
1446 #define QEMU_VM_SUBSECTION           0x05
1447
1448 bool qemu_savevm_state_blocked(Monitor *mon)
1449 {
1450     SaveStateEntry *se;
1451
1452     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1453         if (se->no_migrate) {
1454             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1455                            se->idstr);
1456             return true;
1457         }
1458     }
1459     return false;
1460 }
1461
1462 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1463                             int shared)
1464 {
1465     SaveStateEntry *se;
1466
1467     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1468         if(se->set_params == NULL) {
1469             continue;
1470         }
1471         se->set_params(blk_enable, shared, se->opaque);
1472     }
1473
1474     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1475     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1476
1477     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1478         int len;
1479
1480         if (se->save_live_state == NULL)
1481             continue;
1482
1483         /* Section type */
1484         qemu_put_byte(f, QEMU_VM_SECTION_START);
1485         qemu_put_be32(f, se->section_id);
1486
1487         /* ID string */
1488         len = strlen(se->idstr);
1489         qemu_put_byte(f, len);
1490         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1491
1492         qemu_put_be32(f, se->instance_id);
1493         qemu_put_be32(f, se->version_id);
1494
1495         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1496     }
1497
1498     if (qemu_file_has_error(f)) {
1499         qemu_savevm_state_cancel(mon, f);
1500         return -EIO;
1501     }
1502
1503     return 0;
1504 }
1505
1506 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1507 {
1508     SaveStateEntry *se;
1509     int ret = 1;
1510
1511     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1512         if (se->save_live_state == NULL)
1513             continue;
1514
1515         /* Section type */
1516         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1517         qemu_put_be32(f, se->section_id);
1518
1519         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1520         if (!ret) {
1521             /* Do not proceed to the next vmstate before this one reported
1522                completion of the current stage. This serializes the migration
1523                and reduces the probability that a faster changing state is
1524                synchronized over and over again. */
1525             break;
1526         }
1527     }
1528
1529     if (ret)
1530         return 1;
1531
1532     if (qemu_file_has_error(f)) {
1533         qemu_savevm_state_cancel(mon, f);
1534         return -EIO;
1535     }
1536
1537     return 0;
1538 }
1539
1540 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1541 {
1542     SaveStateEntry *se;
1543
1544     cpu_synchronize_all_states();
1545
1546     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1547         if (se->save_live_state == NULL)
1548             continue;
1549
1550         /* Section type */
1551         qemu_put_byte(f, QEMU_VM_SECTION_END);
1552         qemu_put_be32(f, se->section_id);
1553
1554         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1555     }
1556
1557     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1558         int len;
1559
1560         if (se->save_state == NULL && se->vmsd == NULL)
1561             continue;
1562
1563         /* Section type */
1564         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1565         qemu_put_be32(f, se->section_id);
1566
1567         /* ID string */
1568         len = strlen(se->idstr);
1569         qemu_put_byte(f, len);
1570         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1571
1572         qemu_put_be32(f, se->instance_id);
1573         qemu_put_be32(f, se->version_id);
1574
1575         vmstate_save(f, se);
1576     }
1577
1578     qemu_put_byte(f, QEMU_VM_EOF);
1579
1580     if (qemu_file_has_error(f))
1581         return -EIO;
1582
1583     return 0;
1584 }
1585
1586 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1587 {
1588     SaveStateEntry *se;
1589
1590     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1591         if (se->save_live_state) {
1592             se->save_live_state(mon, f, -1, se->opaque);
1593         }
1594     }
1595 }
1596
1597 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1598 {
1599     int saved_vm_running;
1600     int ret;
1601
1602     saved_vm_running = vm_running;
1603     vm_stop(VMSTOP_SAVEVM);
1604
1605     if (qemu_savevm_state_blocked(mon)) {
1606         ret = -EINVAL;
1607         goto out;
1608     }
1609
1610     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1611     if (ret < 0)
1612         goto out;
1613
1614     do {
1615         ret = qemu_savevm_state_iterate(mon, f);
1616         if (ret < 0)
1617             goto out;
1618     } while (ret == 0);
1619
1620     ret = qemu_savevm_state_complete(mon, f);
1621
1622 out:
1623     if (qemu_file_has_error(f))
1624         ret = -EIO;
1625
1626     if (!ret && saved_vm_running)
1627         vm_start();
1628
1629     return ret;
1630 }
1631
1632 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1633 {
1634     SaveStateEntry *se;
1635
1636     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1637         if (!strcmp(se->idstr, idstr) &&
1638             (instance_id == se->instance_id ||
1639              instance_id == se->alias_id))
1640             return se;
1641         /* Migrating from an older version? */
1642         if (strstr(se->idstr, idstr) && se->compat) {
1643             if (!strcmp(se->compat->idstr, idstr) &&
1644                 (instance_id == se->compat->instance_id ||
1645                  instance_id == se->alias_id))
1646                 return se;
1647         }
1648     }
1649     return NULL;
1650 }
1651
1652 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1653 {
1654     while(sub && sub->needed) {
1655         if (strcmp(idstr, sub->vmsd->name) == 0) {
1656             return sub->vmsd;
1657         }
1658         sub++;
1659     }
1660     return NULL;
1661 }
1662
1663 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1664                                    void *opaque)
1665 {
1666     const VMStateSubsection *sub = vmsd->subsections;
1667
1668     if (!sub || !sub->needed) {
1669         return 0;
1670     }
1671
1672     while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1673         char idstr[256];
1674         int ret;
1675         uint8_t version_id, len;
1676         const VMStateDescription *sub_vmsd;
1677
1678         qemu_get_byte(f); /* subsection */
1679         len = qemu_get_byte(f);
1680         qemu_get_buffer(f, (uint8_t *)idstr, len);
1681         idstr[len] = 0;
1682         version_id = qemu_get_be32(f);
1683
1684         sub_vmsd = vmstate_get_subsection(sub, idstr);
1685         if (sub_vmsd == NULL) {
1686             return -ENOENT;
1687         }
1688         assert(!sub_vmsd->subsections);
1689         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1690         if (ret) {
1691             return ret;
1692         }
1693     }
1694     return 0;
1695 }
1696
1697 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1698                                     void *opaque)
1699 {
1700     const VMStateSubsection *sub = vmsd->subsections;
1701
1702     while (sub && sub->needed) {
1703         if (sub->needed(opaque)) {
1704             const VMStateDescription *vmsd = sub->vmsd;
1705             uint8_t len;
1706
1707             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1708             len = strlen(vmsd->name);
1709             qemu_put_byte(f, len);
1710             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1711             qemu_put_be32(f, vmsd->version_id);
1712             assert(!vmsd->subsections);
1713             vmstate_save_state(f, vmsd, opaque);
1714         }
1715         sub++;
1716     }
1717 }
1718
1719 typedef struct LoadStateEntry {
1720     QLIST_ENTRY(LoadStateEntry) entry;
1721     SaveStateEntry *se;
1722     int section_id;
1723     int version_id;
1724 } LoadStateEntry;
1725
1726 int qemu_loadvm_state(QEMUFile *f)
1727 {
1728     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1729         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1730     LoadStateEntry *le, *new_le;
1731     uint8_t section_type;
1732     unsigned int v;
1733     int ret;
1734
1735     if (qemu_savevm_state_blocked(default_mon)) {
1736         return -EINVAL;
1737     }
1738
1739     v = qemu_get_be32(f);
1740     if (v != QEMU_VM_FILE_MAGIC)
1741         return -EINVAL;
1742
1743     v = qemu_get_be32(f);
1744     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1745         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1746         return -ENOTSUP;
1747     }
1748     if (v != QEMU_VM_FILE_VERSION)
1749         return -ENOTSUP;
1750
1751     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1752         uint32_t instance_id, version_id, section_id;
1753         SaveStateEntry *se;
1754         char idstr[257];
1755         int len;
1756
1757         switch (section_type) {
1758         case QEMU_VM_SECTION_START:
1759         case QEMU_VM_SECTION_FULL:
1760             /* Read section start */
1761             section_id = qemu_get_be32(f);
1762             len = qemu_get_byte(f);
1763             qemu_get_buffer(f, (uint8_t *)idstr, len);
1764             idstr[len] = 0;
1765             instance_id = qemu_get_be32(f);
1766             version_id = qemu_get_be32(f);
1767
1768             /* Find savevm section */
1769             se = find_se(idstr, instance_id);
1770             if (se == NULL) {
1771                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1772                 ret = -EINVAL;
1773                 goto out;
1774             }
1775
1776             /* Validate version */
1777             if (version_id > se->version_id) {
1778                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1779                         version_id, idstr, se->version_id);
1780                 ret = -EINVAL;
1781                 goto out;
1782             }
1783
1784             /* Add entry */
1785             le = qemu_mallocz(sizeof(*le));
1786
1787             le->se = se;
1788             le->section_id = section_id;
1789             le->version_id = version_id;
1790             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1791
1792             ret = vmstate_load(f, le->se, le->version_id);
1793             if (ret < 0) {
1794                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1795                         instance_id, idstr);
1796                 goto out;
1797             }
1798             break;
1799         case QEMU_VM_SECTION_PART:
1800         case QEMU_VM_SECTION_END:
1801             section_id = qemu_get_be32(f);
1802
1803             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1804                 if (le->section_id == section_id) {
1805                     break;
1806                 }
1807             }
1808             if (le == NULL) {
1809                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1810                 ret = -EINVAL;
1811                 goto out;
1812             }
1813
1814             ret = vmstate_load(f, le->se, le->version_id);
1815             if (ret < 0) {
1816                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1817                         section_id);
1818                 goto out;
1819             }
1820             break;
1821         default:
1822             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1823             ret = -EINVAL;
1824             goto out;
1825         }
1826     }
1827
1828     cpu_synchronize_all_post_init();
1829
1830     ret = 0;
1831
1832 out:
1833     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1834         QLIST_REMOVE(le, entry);
1835         qemu_free(le);
1836     }
1837
1838     if (qemu_file_has_error(f))
1839         ret = -EIO;
1840
1841     return ret;
1842 }
1843
1844 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1845                               const char *name)
1846 {
1847     QEMUSnapshotInfo *sn_tab, *sn;
1848     int nb_sns, i, ret;
1849
1850     ret = -ENOENT;
1851     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1852     if (nb_sns < 0)
1853         return ret;
1854     for(i = 0; i < nb_sns; i++) {
1855         sn = &sn_tab[i];
1856         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1857             *sn_info = *sn;
1858             ret = 0;
1859             break;
1860         }
1861     }
1862     qemu_free(sn_tab);
1863     return ret;
1864 }
1865
1866 /*
1867  * Deletes snapshots of a given name in all opened images.
1868  */
1869 static int del_existing_snapshots(Monitor *mon, const char *name)
1870 {
1871     BlockDriverState *bs;
1872     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1873     int ret;
1874
1875     bs = NULL;
1876     while ((bs = bdrv_next(bs))) {
1877         if (bdrv_can_snapshot(bs) &&
1878             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1879         {
1880             ret = bdrv_snapshot_delete(bs, name);
1881             if (ret < 0) {
1882                 monitor_printf(mon,
1883                                "Error while deleting snapshot on '%s'\n",
1884                                bdrv_get_device_name(bs));
1885                 return -1;
1886             }
1887         }
1888     }
1889
1890     return 0;
1891 }
1892
1893 void do_savevm(Monitor *mon, const QDict *qdict)
1894 {
1895     BlockDriverState *bs, *bs1;
1896     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1897     int ret;
1898     QEMUFile *f;
1899     int saved_vm_running;
1900     uint32_t vm_state_size;
1901 #ifdef _WIN32
1902     struct _timeb tb;
1903     struct tm *ptm;
1904 #else
1905     struct timeval tv;
1906     struct tm tm;
1907 #endif
1908     const char *name = qdict_get_try_str(qdict, "name");
1909
1910     /* Verify if there is a device that doesn't support snapshots and is writable */
1911     bs = NULL;
1912     while ((bs = bdrv_next(bs))) {
1913
1914         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1915             continue;
1916         }
1917
1918         if (!bdrv_can_snapshot(bs)) {
1919             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1920                                bdrv_get_device_name(bs));
1921             return;
1922         }
1923     }
1924
1925     bs = bdrv_snapshots();
1926     if (!bs) {
1927         monitor_printf(mon, "No block device can accept snapshots\n");
1928         return;
1929     }
1930
1931     saved_vm_running = vm_running;
1932     vm_stop(VMSTOP_SAVEVM);
1933
1934     memset(sn, 0, sizeof(*sn));
1935
1936     /* fill auxiliary fields */
1937 #ifdef _WIN32
1938     _ftime(&tb);
1939     sn->date_sec = tb.time;
1940     sn->date_nsec = tb.millitm * 1000000;
1941 #else
1942     gettimeofday(&tv, NULL);
1943     sn->date_sec = tv.tv_sec;
1944     sn->date_nsec = tv.tv_usec * 1000;
1945 #endif
1946     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1947
1948     if (name) {
1949         ret = bdrv_snapshot_find(bs, old_sn, name);
1950         if (ret >= 0) {
1951             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1952             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1953         } else {
1954             pstrcpy(sn->name, sizeof(sn->name), name);
1955         }
1956     } else {
1957 #ifdef _WIN32
1958         ptm = localtime(&tb.time);
1959         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1960 #else
1961         /* cast below needed for OpenBSD where tv_sec is still 'long' */
1962         localtime_r((const time_t *)&tv.tv_sec, &tm);
1963         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1964 #endif
1965     }
1966
1967     /* Delete old snapshots of the same name */
1968     if (name && del_existing_snapshots(mon, name) < 0) {
1969         goto the_end;
1970     }
1971
1972     /* save the VM state */
1973     f = qemu_fopen_bdrv(bs, 1);
1974     if (!f) {
1975         monitor_printf(mon, "Could not open VM state file\n");
1976         goto the_end;
1977     }
1978     ret = qemu_savevm_state(mon, f);
1979     vm_state_size = qemu_ftell(f);
1980     qemu_fclose(f);
1981     if (ret < 0) {
1982         monitor_printf(mon, "Error %d while writing VM\n", ret);
1983         goto the_end;
1984     }
1985
1986     /* create the snapshots */
1987
1988     bs1 = NULL;
1989     while ((bs1 = bdrv_next(bs1))) {
1990         if (bdrv_can_snapshot(bs1)) {
1991             /* Write VM state size only to the image that contains the state */
1992             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1993             ret = bdrv_snapshot_create(bs1, sn);
1994             if (ret < 0) {
1995                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1996                                bdrv_get_device_name(bs1));
1997             }
1998         }
1999     }
2000
2001  the_end:
2002     if (saved_vm_running)
2003         vm_start();
2004 }
2005
2006 int load_vmstate(const char *name)
2007 {
2008     BlockDriverState *bs, *bs_vm_state;
2009     QEMUSnapshotInfo sn;
2010     QEMUFile *f;
2011     int ret;
2012
2013     bs_vm_state = bdrv_snapshots();
2014     if (!bs_vm_state) {
2015         error_report("No block device supports snapshots");
2016         return -ENOTSUP;
2017     }
2018
2019     /* Don't even try to load empty VM states */
2020     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2021     if (ret < 0) {
2022         return ret;
2023     } else if (sn.vm_state_size == 0) {
2024         return -EINVAL;
2025     }
2026
2027     /* Verify if there is any device that doesn't support snapshots and is
2028     writable and check if the requested snapshot is available too. */
2029     bs = NULL;
2030     while ((bs = bdrv_next(bs))) {
2031
2032         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
2033             continue;
2034         }
2035
2036         if (!bdrv_can_snapshot(bs)) {
2037             error_report("Device '%s' is writable but does not support snapshots.",
2038                                bdrv_get_device_name(bs));
2039             return -ENOTSUP;
2040         }
2041
2042         ret = bdrv_snapshot_find(bs, &sn, name);
2043         if (ret < 0) {
2044             error_report("Device '%s' does not have the requested snapshot '%s'",
2045                            bdrv_get_device_name(bs), name);
2046             return ret;
2047         }
2048     }
2049
2050     /* Flush all IO requests so they don't interfere with the new state.  */
2051     qemu_aio_flush();
2052
2053     bs = NULL;
2054     while ((bs = bdrv_next(bs))) {
2055         if (bdrv_can_snapshot(bs)) {
2056             ret = bdrv_snapshot_goto(bs, name);
2057             if (ret < 0) {
2058                 error_report("Error %d while activating snapshot '%s' on '%s'",
2059                              ret, name, bdrv_get_device_name(bs));
2060                 return ret;
2061             }
2062         }
2063     }
2064
2065     /* restore the VM state */
2066     f = qemu_fopen_bdrv(bs_vm_state, 0);
2067     if (!f) {
2068         error_report("Could not open VM state file");
2069         return -EINVAL;
2070     }
2071
2072     ret = qemu_loadvm_state(f);
2073
2074     qemu_fclose(f);
2075     if (ret < 0) {
2076         error_report("Error %d while loading VM state", ret);
2077         return ret;
2078     }
2079
2080     return 0;
2081 }
2082
2083 void do_delvm(Monitor *mon, const QDict *qdict)
2084 {
2085     BlockDriverState *bs, *bs1;
2086     int ret;
2087     const char *name = qdict_get_str(qdict, "name");
2088
2089     bs = bdrv_snapshots();
2090     if (!bs) {
2091         monitor_printf(mon, "No block device supports snapshots\n");
2092         return;
2093     }
2094
2095     bs1 = NULL;
2096     while ((bs1 = bdrv_next(bs1))) {
2097         if (bdrv_can_snapshot(bs1)) {
2098             ret = bdrv_snapshot_delete(bs1, name);
2099             if (ret < 0) {
2100                 if (ret == -ENOTSUP)
2101                     monitor_printf(mon,
2102                                    "Snapshots not supported on device '%s'\n",
2103                                    bdrv_get_device_name(bs1));
2104                 else
2105                     monitor_printf(mon, "Error %d while deleting snapshot on "
2106                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2107             }
2108         }
2109     }
2110 }
2111
2112 void do_info_snapshots(Monitor *mon)
2113 {
2114     BlockDriverState *bs, *bs1;
2115     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2116     int nb_sns, i, ret, available;
2117     int total;
2118     int *available_snapshots;
2119     char buf[256];
2120
2121     bs = bdrv_snapshots();
2122     if (!bs) {
2123         monitor_printf(mon, "No available block device supports snapshots\n");
2124         return;
2125     }
2126
2127     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2128     if (nb_sns < 0) {
2129         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2130         return;
2131     }
2132
2133     if (nb_sns == 0) {
2134         monitor_printf(mon, "There is no snapshot available.\n");
2135         return;
2136     }
2137
2138     available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2139     total = 0;
2140     for (i = 0; i < nb_sns; i++) {
2141         sn = &sn_tab[i];
2142         available = 1;
2143         bs1 = NULL;
2144
2145         while ((bs1 = bdrv_next(bs1))) {
2146             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2147                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2148                 if (ret < 0) {
2149                     available = 0;
2150                     break;
2151                 }
2152             }
2153         }
2154
2155         if (available) {
2156             available_snapshots[total] = i;
2157             total++;
2158         }
2159     }
2160
2161     if (total > 0) {
2162         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2163         for (i = 0; i < total; i++) {
2164             sn = &sn_tab[available_snapshots[i]];
2165             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2166         }
2167     } else {
2168         monitor_printf(mon, "There is no suitable snapshot available\n");
2169     }
2170
2171     qemu_free(sn_tab);
2172     qemu_free(available_snapshots);
2173
2174 }