savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <time.h>
  27 #include <errno.h>
  28 #include <sys/time.h>
  29 #include <zlib.h>
  30
  31 /* Needed early for CONFIG_BSD etc. */
  32 #include "config-host.h"
  33
  34 #ifndef _WIN32
  35 #include <sys/times.h>
  36 #include <sys/wait.h>
  37 #include <termios.h>
  38 #include <sys/mman.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/resource.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <net/if.h>
  44 #include <arpa/inet.h>
  45 #include <dirent.h>
  46 #include <netdb.h>
  47 #include <sys/select.h>
  48 #ifdef CONFIG_BSD
  49 #include <sys/stat.h>
  50 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  51 #include <libutil.h>
  52 #else
  53 #include <util.h>
  54 #endif
  55 #ifdef __linux__
  56 #include <pty.h>
  57 #include <malloc.h>
  58 #include <linux/rtc.h>
  59 #endif
  60 #endif
  61 #endif
  62
  63 #ifdef _WIN32
  64 #include <windows.h>
  65 #include <malloc.h>
  66 #include <sys/timeb.h>
  67 #include <mmsystem.h>
  68 #define getopt_long_only getopt_long
  69 #define memalign(align, size) malloc(size)
  70 #endif
  71
  72 #include "qemu-common.h"
  73 #include "hw/hw.h"
  74 #include "hw/qdev.h"
  75 #include "net.h"
  76 #include "monitor.h"
  77 #include "sysemu.h"
  78 #include "qemu-timer.h"
  79 #include "qemu-char.h"
  80 #include "audio/audio.h"
  81 #include "migration.h"
  82 #include "qemu_socket.h"
  83 #include "qemu-queue.h"
  84 #include "qemu-timer.h"
  85 #include "cpus.h"
  86 #include "memory.h"
  87
  88 #define SELF_ANNOUNCE_ROUNDS 5
  89
  90 #ifndef ETH_P_RARP
  91 #define ETH_P_RARP 0x8035
  92 #endif
  93 #define ARP_HTYPE_ETH 0x0001
  94 #define ARP_PTYPE_IP 0x0800
  95 #define ARP_OP_REQUEST_REV 0x3
  96
  97 static int announce_self_create(uint8_t *buf,
  98                                 uint8_t *mac_addr)
  99 {
 100     /* Ethernet header. */
 101     memset(buf, 0xff, 6);         /* destination MAC addr */
 102     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 103     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 104
 105     /* RARP header. */
 106     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 107     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 108     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 109     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 110     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 111     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 112     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 113     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 114     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 115
 116     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 117     memset(buf + 42, 0x00, 18);
 118
 119     return 60; /* len (FCS will be added by hardware) */
 120 }
 121
 122 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 123 {
 124     uint8_t buf[60];
 125     int len;
 126
 127     len = announce_self_create(buf, nic->conf->macaddr.a);
 128
 129     qemu_send_packet_raw(&nic->nc, buf, len);
 130 }
 131
 132
 133 static void qemu_announce_self_once(void *opaque)
 134 {
 135     static int count = SELF_ANNOUNCE_ROUNDS;
 136     QEMUTimer *timer = *(QEMUTimer **)opaque;
 137
 138     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 139
 140     if (--count) {
 141         /* delay 50ms, 150ms, 250ms, ... */
 142         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 143                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 144     } else {
 145             qemu_del_timer(timer);
 146             qemu_free_timer(timer);
 147     }
 148 }
 149
 150 void qemu_announce_self(void)
 151 {
 152         static QEMUTimer *timer;
 153         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 154         qemu_announce_self_once(&timer);
 155 }
 156
 157 /***********************************************************/
 158 /* savevm/loadvm support */
 159
 160 #define IO_BUF_SIZE 32768
 161
 162 struct QEMUFile {
 163     QEMUFilePutBufferFunc *put_buffer;
 164     QEMUFileGetBufferFunc *get_buffer;
 165     QEMUFileCloseFunc *close;
 166     QEMUFileRateLimit *rate_limit;
 167     QEMUFileSetRateLimit *set_rate_limit;
 168     QEMUFileGetRateLimit *get_rate_limit;
 169     void *opaque;
 170     int is_write;
 171
 172     int64_t buf_offset; /* start of buffer when writing, end of buffer
 173                            when reading */
 174     int buf_index;
 175     int buf_size; /* 0 when writing */
 176     uint8_t buf[IO_BUF_SIZE];
 177
 178     int last_error;
 179 };
 180
 181 typedef struct QEMUFileStdio
 182 {
 183     FILE *stdio_file;
 184     QEMUFile *file;
 185 } QEMUFileStdio;
 186
 187 typedef struct QEMUFileSocket
 188 {
 189     int fd;
 190     QEMUFile *file;
 191 } QEMUFileSocket;
 192
 193 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 194 {
 195     QEMUFileSocket *s = opaque;
 196     ssize_t len;
 197
 198     do {
 199         len = qemu_recv(s->fd, buf, size, 0);
 200     } while (len == -1 && socket_error() == EINTR);
 201
 202     if (len == -1)
 203         len = -socket_error();
 204
 205     return len;
 206 }
 207
 208 static int socket_close(void *opaque)
 209 {
 210     QEMUFileSocket *s = opaque;
 211     g_free(s);
 212     return 0;
 213 }
 214
 215 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 216 {
 217     QEMUFileStdio *s = opaque;
 218     return fwrite(buf, 1, size, s->stdio_file);
 219 }
 220
 221 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 222 {
 223     QEMUFileStdio *s = opaque;
 224     FILE *fp = s->stdio_file;
 225     int bytes;
 226
 227     do {
 228         clearerr(fp);
 229         bytes = fread(buf, 1, size, fp);
 230     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 231     return bytes;
 232 }
 233
 234 static int stdio_pclose(void *opaque)
 235 {
 236     QEMUFileStdio *s = opaque;
 237     int ret;
 238     ret = pclose(s->stdio_file);
 239     if (ret == -1) {
 240         ret = -errno;
 241     }
 242     g_free(s);
 243     return ret;
 244 }
 245
 246 static int stdio_fclose(void *opaque)
 247 {
 248     QEMUFileStdio *s = opaque;
 249     int ret = 0;
 250     if (fclose(s->stdio_file) == EOF) {
 251         ret = -errno;
 252     }
 253     g_free(s);
 254     return ret;
 255 }
 256
 257 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 258 {
 259     QEMUFileStdio *s;
 260
 261     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 262         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 263         return NULL;
 264     }
 265
 266     s = g_malloc0(sizeof(QEMUFileStdio));
 267
 268     s->stdio_file = stdio_file;
 269
 270     if(mode[0] == 'r') {
 271         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 272                                  NULL, NULL, NULL);
 273     } else {
 274         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 275                                  NULL, NULL, NULL);
 276     }
 277     return s->file;
 278 }
 279
 280 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 281 {
 282     FILE *popen_file;
 283
 284     popen_file = popen(command, mode);
 285     if(popen_file == NULL) {
 286         return NULL;
 287     }
 288
 289     return qemu_popen(popen_file, mode);
 290 }
 291
 292 int qemu_stdio_fd(QEMUFile *f)
 293 {
 294     QEMUFileStdio *p;
 295     int fd;
 296
 297     p = (QEMUFileStdio *)f->opaque;
 298     fd = fileno(p->stdio_file);
 299
 300     return fd;
 301 }
 302
 303 QEMUFile *qemu_fdopen(int fd, const char *mode)
 304 {
 305     QEMUFileStdio *s;
 306
 307     if (mode == NULL ||
 308         (mode[0] != 'r' && mode[0] != 'w') ||
 309         mode[1] != 'b' || mode[2] != 0) {
 310         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 311         return NULL;
 312     }
 313
 314     s = g_malloc0(sizeof(QEMUFileStdio));
 315     s->stdio_file = fdopen(fd, mode);
 316     if (!s->stdio_file)
 317         goto fail;
 318
 319     if(mode[0] == 'r') {
 320         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 321                                  NULL, NULL, NULL);
 322     } else {
 323         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 324                                  NULL, NULL, NULL);
 325     }
 326     return s->file;
 327
 328 fail:
 329     g_free(s);
 330     return NULL;
 331 }
 332
 333 QEMUFile *qemu_fopen_socket(int fd)
 334 {
 335     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 336
 337     s->fd = fd;
 338     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 339                              NULL, NULL, NULL);
 340     return s->file;
 341 }
 342
 343 static int file_put_buffer(void *opaque, const uint8_t *buf,
 344                             int64_t pos, int size)
 345 {
 346     QEMUFileStdio *s = opaque;
 347     fseek(s->stdio_file, pos, SEEK_SET);
 348     return fwrite(buf, 1, size, s->stdio_file);
 349 }
 350
 351 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 352 {
 353     QEMUFileStdio *s = opaque;
 354     fseek(s->stdio_file, pos, SEEK_SET);
 355     return fread(buf, 1, size, s->stdio_file);
 356 }
 357
 358 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 359 {
 360     QEMUFileStdio *s;
 361
 362     if (mode == NULL ||
 363         (mode[0] != 'r' && mode[0] != 'w') ||
 364         mode[1] != 'b' || mode[2] != 0) {
 365         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 366         return NULL;
 367     }
 368
 369     s = g_malloc0(sizeof(QEMUFileStdio));
 370
 371     s->stdio_file = fopen(filename, mode);
 372     if (!s->stdio_file)
 373         goto fail;
 374
 375     if(mode[0] == 'w') {
 376         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 377                                  NULL, NULL, NULL);
 378     } else {
 379         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 380                                NULL, NULL, NULL);
 381     }
 382     return s->file;
 383 fail:
 384     g_free(s);
 385     return NULL;
 386 }
 387
 388 static int block_put_buffer(void *opaque, const uint8_t *buf,
 389                            int64_t pos, int size)
 390 {
 391     bdrv_save_vmstate(opaque, buf, pos, size);
 392     return size;
 393 }
 394
 395 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 396 {
 397     return bdrv_load_vmstate(opaque, buf, pos, size);
 398 }
 399
 400 static int bdrv_fclose(void *opaque)
 401 {
 402     return 0;
 403 }
 404
 405 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 406 {
 407     if (is_writable)
 408         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 409                               NULL, NULL, NULL);
 410     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 411 }
 412
 413 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 414                          QEMUFileGetBufferFunc *get_buffer,
 415                          QEMUFileCloseFunc *close,
 416                          QEMUFileRateLimit *rate_limit,
 417                          QEMUFileSetRateLimit *set_rate_limit,
 418                          QEMUFileGetRateLimit *get_rate_limit)
 419 {
 420     QEMUFile *f;
 421
 422     f = g_malloc0(sizeof(QEMUFile));
 423
 424     f->opaque = opaque;
 425     f->put_buffer = put_buffer;
 426     f->get_buffer = get_buffer;
 427     f->close = close;
 428     f->rate_limit = rate_limit;
 429     f->set_rate_limit = set_rate_limit;
 430     f->get_rate_limit = get_rate_limit;
 431     f->is_write = 0;
 432
 433     return f;
 434 }
 435
 436 int qemu_file_get_error(QEMUFile *f)
 437 {
 438     return f->last_error;
 439 }
 440
 441 void qemu_file_set_error(QEMUFile *f, int ret)
 442 {
 443     f->last_error = ret;
 444 }
 445
 446 /** Sets last_error conditionally
 447  *
 448  * Sets last_error only if ret is negative _and_ no error
 449  * was set before.
 450  */
 451 static void qemu_file_set_if_error(QEMUFile *f, int ret)
 452 {
 453     if (ret < 0 && !f->last_error) {
 454         qemu_file_set_error(f, ret);
 455     }
 456 }
 457
 458 /** Flushes QEMUFile buffer
 459  *
 460  * In case of error, last_error is set.
 461  */
 462 void qemu_fflush(QEMUFile *f)
 463 {
 464     if (!f->put_buffer)
 465         return;
 466
 467     if (f->is_write && f->buf_index > 0) {
 468         int len;
 469
 470         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 471         if (len > 0)
 472             f->buf_offset += f->buf_index;
 473         else
 474             qemu_file_set_error(f, -EINVAL);
 475         f->buf_index = 0;
 476     }
 477 }
 478
 479 static void qemu_fill_buffer(QEMUFile *f)
 480 {
 481     int len;
 482     int pending;
 483
 484     if (!f->get_buffer)
 485         return;
 486
 487     if (f->is_write)
 488         abort();
 489
 490     pending = f->buf_size - f->buf_index;
 491     if (pending > 0) {
 492         memmove(f->buf, f->buf + f->buf_index, pending);
 493     }
 494     f->buf_index = 0;
 495     f->buf_size = pending;
 496
 497     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 498                         IO_BUF_SIZE - pending);
 499     if (len > 0) {
 500         f->buf_size += len;
 501         f->buf_offset += len;
 502     } else if (len == 0) {
 503         f->last_error = -EIO;
 504     } else if (len != -EAGAIN)
 505         qemu_file_set_error(f, len);
 506 }
 507
 508 /** Calls close function and set last_error if needed
 509  *
 510  * Internal function. qemu_fflush() must be called before this.
 511  *
 512  * Returns f->close() return value, or 0 if close function is not set.
 513  */
 514 static int qemu_close(QEMUFile *f)
 515 {
 516     int ret = 0;
 517     if (f->close) {
 518         ret = f->close(f->opaque);
 519         qemu_file_set_if_error(f, ret);
 520     }
 521     return ret;
 522 }
 523
 524 /** Closes the file
 525  *
 526  * Returns negative error value if any error happened on previous operations or
 527  * while closing the file. Returns 0 or positive number on success.
 528  *
 529  * The meaning of return value on success depends on the specific backend
 530  * being used.
 531  */
 532 int qemu_fclose(QEMUFile *f)
 533 {
 534     int ret;
 535     qemu_fflush(f);
 536     ret = qemu_close(f);
 537     /* If any error was spotted before closing, we should report it
 538      * instead of the close() return value.
 539      */
 540     if (f->last_error) {
 541         ret = f->last_error;
 542     }
 543     g_free(f);
 544     return ret;
 545 }
 546
 547 void qemu_file_put_notify(QEMUFile *f)
 548 {
 549     f->put_buffer(f->opaque, NULL, 0, 0);
 550 }
 551
 552 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 553 {
 554     int l;
 555
 556     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 557         fprintf(stderr,
 558                 "Attempted to write to buffer while read buffer is not empty\n");
 559         abort();
 560     }
 561
 562     while (!f->last_error && size > 0) {
 563         l = IO_BUF_SIZE - f->buf_index;
 564         if (l > size)
 565             l = size;
 566         memcpy(f->buf + f->buf_index, buf, l);
 567         f->is_write = 1;
 568         f->buf_index += l;
 569         buf += l;
 570         size -= l;
 571         if (f->buf_index >= IO_BUF_SIZE)
 572             qemu_fflush(f);
 573     }
 574 }
 575
 576 void qemu_put_byte(QEMUFile *f, int v)
 577 {
 578     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 579         fprintf(stderr,
 580                 "Attempted to write to buffer while read buffer is not empty\n");
 581         abort();
 582     }
 583
 584     f->buf[f->buf_index++] = v;
 585     f->is_write = 1;
 586     if (f->buf_index >= IO_BUF_SIZE)
 587         qemu_fflush(f);
 588 }
 589
 590 static void qemu_file_skip(QEMUFile *f, int size)
 591 {
 592     if (f->buf_index + size <= f->buf_size) {
 593         f->buf_index += size;
 594     }
 595 }
 596
 597 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 598 {
 599     int pending;
 600     int index;
 601
 602     if (f->is_write) {
 603         abort();
 604     }
 605
 606     index = f->buf_index + offset;
 607     pending = f->buf_size - index;
 608     if (pending < size) {
 609         qemu_fill_buffer(f);
 610         index = f->buf_index + offset;
 611         pending = f->buf_size - index;
 612     }
 613
 614     if (pending <= 0) {
 615         return 0;
 616     }
 617     if (size > pending) {
 618         size = pending;
 619     }
 620
 621     memcpy(buf, f->buf + index, size);
 622     return size;
 623 }
 624
 625 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 626 {
 627     int pending = size;
 628     int done = 0;
 629
 630     while (pending > 0) {
 631         int res;
 632
 633         res = qemu_peek_buffer(f, buf, pending, 0);
 634         if (res == 0) {
 635             return done;
 636         }
 637         qemu_file_skip(f, res);
 638         buf += res;
 639         pending -= res;
 640         done += res;
 641     }
 642     return done;
 643 }
 644
 645 static int qemu_peek_byte(QEMUFile *f, int offset)
 646 {
 647     int index = f->buf_index + offset;
 648
 649     if (f->is_write) {
 650         abort();
 651     }
 652
 653     if (index >= f->buf_size) {
 654         qemu_fill_buffer(f);
 655         index = f->buf_index + offset;
 656         if (index >= f->buf_size) {
 657             return 0;
 658         }
 659     }
 660     return f->buf[index];
 661 }
 662
 663 int qemu_get_byte(QEMUFile *f)
 664 {
 665     int result;
 666
 667     result = qemu_peek_byte(f, 0);
 668     qemu_file_skip(f, 1);
 669     return result;
 670 }
 671
 672 int64_t qemu_ftell(QEMUFile *f)
 673 {
 674     return f->buf_offset - f->buf_size + f->buf_index;
 675 }
 676
 677 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 678 {
 679     if (whence == SEEK_SET) {
 680         /* nothing to do */
 681     } else if (whence == SEEK_CUR) {
 682         pos += qemu_ftell(f);
 683     } else {
 684         /* SEEK_END not supported */
 685         return -1;
 686     }
 687     if (f->put_buffer) {
 688         qemu_fflush(f);
 689         f->buf_offset = pos;
 690     } else {
 691         f->buf_offset = pos;
 692         f->buf_index = 0;
 693         f->buf_size = 0;
 694     }
 695     return pos;
 696 }
 697
 698 int qemu_file_rate_limit(QEMUFile *f)
 699 {
 700     if (f->rate_limit)
 701         return f->rate_limit(f->opaque);
 702
 703     return 0;
 704 }
 705
 706 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 707 {
 708     if (f->get_rate_limit)
 709         return f->get_rate_limit(f->opaque);
 710
 711     return 0;
 712 }
 713
 714 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 715 {
 716     /* any failed or completed migration keeps its state to allow probing of
 717      * migration data, but has no associated file anymore */
 718     if (f && f->set_rate_limit)
 719         return f->set_rate_limit(f->opaque, new_rate);
 720
 721     return 0;
 722 }
 723
 724 void qemu_put_be16(QEMUFile *f, unsigned int v)
 725 {
 726     qemu_put_byte(f, v >> 8);
 727     qemu_put_byte(f, v);
 728 }
 729
 730 void qemu_put_be32(QEMUFile *f, unsigned int v)
 731 {
 732     qemu_put_byte(f, v >> 24);
 733     qemu_put_byte(f, v >> 16);
 734     qemu_put_byte(f, v >> 8);
 735     qemu_put_byte(f, v);
 736 }
 737
 738 void qemu_put_be64(QEMUFile *f, uint64_t v)
 739 {
 740     qemu_put_be32(f, v >> 32);
 741     qemu_put_be32(f, v);
 742 }
 743
 744 unsigned int qemu_get_be16(QEMUFile *f)
 745 {
 746     unsigned int v;
 747     v = qemu_get_byte(f) << 8;
 748     v |= qemu_get_byte(f);
 749     return v;
 750 }
 751
 752 unsigned int qemu_get_be32(QEMUFile *f)
 753 {
 754     unsigned int v;
 755     v = qemu_get_byte(f) << 24;
 756     v |= qemu_get_byte(f) << 16;
 757     v |= qemu_get_byte(f) << 8;
 758     v |= qemu_get_byte(f);
 759     return v;
 760 }
 761
 762 uint64_t qemu_get_be64(QEMUFile *f)
 763 {
 764     uint64_t v;
 765     v = (uint64_t)qemu_get_be32(f) << 32;
 766     v |= qemu_get_be32(f);
 767     return v;
 768 }
 769
 770
 771 /* timer */
 772
 773 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 774 {
 775     uint64_t expire_time;
 776
 777     expire_time = qemu_timer_expire_time_ns(ts);
 778     qemu_put_be64(f, expire_time);
 779 }
 780
 781 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 782 {
 783     uint64_t expire_time;
 784
 785     expire_time = qemu_get_be64(f);
 786     if (expire_time != -1) {
 787         qemu_mod_timer_ns(ts, expire_time);
 788     } else {
 789         qemu_del_timer(ts);
 790     }
 791 }
 792
 793
 794 /* bool */
 795
 796 static int get_bool(QEMUFile *f, void *pv, size_t size)
 797 {
 798     bool *v = pv;
 799     *v = qemu_get_byte(f);
 800     return 0;
 801 }
 802
 803 static void put_bool(QEMUFile *f, void *pv, size_t size)
 804 {
 805     bool *v = pv;
 806     qemu_put_byte(f, *v);
 807 }
 808
 809 const VMStateInfo vmstate_info_bool = {
 810     .name = "bool",
 811     .get  = get_bool,
 812     .put  = put_bool,
 813 };
 814
 815 /* 8 bit int */
 816
 817 static int get_int8(QEMUFile *f, void *pv, size_t size)
 818 {
 819     int8_t *v = pv;
 820     qemu_get_s8s(f, v);
 821     return 0;
 822 }
 823
 824 static void put_int8(QEMUFile *f, void *pv, size_t size)
 825 {
 826     int8_t *v = pv;
 827     qemu_put_s8s(f, v);
 828 }
 829
 830 const VMStateInfo vmstate_info_int8 = {
 831     .name = "int8",
 832     .get  = get_int8,
 833     .put  = put_int8,
 834 };
 835
 836 /* 16 bit int */
 837
 838 static int get_int16(QEMUFile *f, void *pv, size_t size)
 839 {
 840     int16_t *v = pv;
 841     qemu_get_sbe16s(f, v);
 842     return 0;
 843 }
 844
 845 static void put_int16(QEMUFile *f, void *pv, size_t size)
 846 {
 847     int16_t *v = pv;
 848     qemu_put_sbe16s(f, v);
 849 }
 850
 851 const VMStateInfo vmstate_info_int16 = {
 852     .name = "int16",
 853     .get  = get_int16,
 854     .put  = put_int16,
 855 };
 856
 857 /* 32 bit int */
 858
 859 static int get_int32(QEMUFile *f, void *pv, size_t size)
 860 {
 861     int32_t *v = pv;
 862     qemu_get_sbe32s(f, v);
 863     return 0;
 864 }
 865
 866 static void put_int32(QEMUFile *f, void *pv, size_t size)
 867 {
 868     int32_t *v = pv;
 869     qemu_put_sbe32s(f, v);
 870 }
 871
 872 const VMStateInfo vmstate_info_int32 = {
 873     .name = "int32",
 874     .get  = get_int32,
 875     .put  = put_int32,
 876 };
 877
 878 /* 32 bit int. See that the received value is the same than the one
 879    in the field */
 880
 881 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 882 {
 883     int32_t *v = pv;
 884     int32_t v2;
 885     qemu_get_sbe32s(f, &v2);
 886
 887     if (*v == v2)
 888         return 0;
 889     return -EINVAL;
 890 }
 891
 892 const VMStateInfo vmstate_info_int32_equal = {
 893     .name = "int32 equal",
 894     .get  = get_int32_equal,
 895     .put  = put_int32,
 896 };
 897
 898 /* 32 bit int. See that the received value is the less or the same
 899    than the one in the field */
 900
 901 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 902 {
 903     int32_t *old = pv;
 904     int32_t new;
 905     qemu_get_sbe32s(f, &new);
 906
 907     if (*old <= new)
 908         return 0;
 909     return -EINVAL;
 910 }
 911
 912 const VMStateInfo vmstate_info_int32_le = {
 913     .name = "int32 equal",
 914     .get  = get_int32_le,
 915     .put  = put_int32,
 916 };
 917
 918 /* 64 bit int */
 919
 920 static int get_int64(QEMUFile *f, void *pv, size_t size)
 921 {
 922     int64_t *v = pv;
 923     qemu_get_sbe64s(f, v);
 924     return 0;
 925 }
 926
 927 static void put_int64(QEMUFile *f, void *pv, size_t size)
 928 {
 929     int64_t *v = pv;
 930     qemu_put_sbe64s(f, v);
 931 }
 932
 933 const VMStateInfo vmstate_info_int64 = {
 934     .name = "int64",
 935     .get  = get_int64,
 936     .put  = put_int64,
 937 };
 938
 939 /* 8 bit unsigned int */
 940
 941 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 942 {
 943     uint8_t *v = pv;
 944     qemu_get_8s(f, v);
 945     return 0;
 946 }
 947
 948 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 949 {
 950     uint8_t *v = pv;
 951     qemu_put_8s(f, v);
 952 }
 953
 954 const VMStateInfo vmstate_info_uint8 = {
 955     .name = "uint8",
 956     .get  = get_uint8,
 957     .put  = put_uint8,
 958 };
 959
 960 /* 16 bit unsigned int */
 961
 962 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 963 {
 964     uint16_t *v = pv;
 965     qemu_get_be16s(f, v);
 966     return 0;
 967 }
 968
 969 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 970 {
 971     uint16_t *v = pv;
 972     qemu_put_be16s(f, v);
 973 }
 974
 975 const VMStateInfo vmstate_info_uint16 = {
 976     .name = "uint16",
 977     .get  = get_uint16,
 978     .put  = put_uint16,
 979 };
 980
 981 /* 32 bit unsigned int */
 982
 983 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 984 {
 985     uint32_t *v = pv;
 986     qemu_get_be32s(f, v);
 987     return 0;
 988 }
 989
 990 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 991 {
 992     uint32_t *v = pv;
 993     qemu_put_be32s(f, v);
 994 }
 995
 996 const VMStateInfo vmstate_info_uint32 = {
 997     .name = "uint32",
 998     .get  = get_uint32,
 999     .put  = put_uint32,
1000 };
1001
1002 /* 32 bit uint. See that the received value is the same than the one
1003    in the field */
1004
1005 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1006 {
1007     uint32_t *v = pv;
1008     uint32_t v2;
1009     qemu_get_be32s(f, &v2);
1010
1011     if (*v == v2) {
1012         return 0;
1013     }
1014     return -EINVAL;
1015 }
1016
1017 const VMStateInfo vmstate_info_uint32_equal = {
1018     .name = "uint32 equal",
1019     .get  = get_uint32_equal,
1020     .put  = put_uint32,
1021 };
1022
1023 /* 64 bit unsigned int */
1024
1025 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1026 {
1027     uint64_t *v = pv;
1028     qemu_get_be64s(f, v);
1029     return 0;
1030 }
1031
1032 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1033 {
1034     uint64_t *v = pv;
1035     qemu_put_be64s(f, v);
1036 }
1037
1038 const VMStateInfo vmstate_info_uint64 = {
1039     .name = "uint64",
1040     .get  = get_uint64,
1041     .put  = put_uint64,
1042 };
1043
1044 /* 8 bit int. See that the received value is the same than the one
1045    in the field */
1046
1047 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1048 {
1049     uint8_t *v = pv;
1050     uint8_t v2;
1051     qemu_get_8s(f, &v2);
1052
1053     if (*v == v2)
1054         return 0;
1055     return -EINVAL;
1056 }
1057
1058 const VMStateInfo vmstate_info_uint8_equal = {
1059     .name = "uint8 equal",
1060     .get  = get_uint8_equal,
1061     .put  = put_uint8,
1062 };
1063
1064 /* 16 bit unsigned int int. See that the received value is the same than the one
1065    in the field */
1066
1067 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1068 {
1069     uint16_t *v = pv;
1070     uint16_t v2;
1071     qemu_get_be16s(f, &v2);
1072
1073     if (*v == v2)
1074         return 0;
1075     return -EINVAL;
1076 }
1077
1078 const VMStateInfo vmstate_info_uint16_equal = {
1079     .name = "uint16 equal",
1080     .get  = get_uint16_equal,
1081     .put  = put_uint16,
1082 };
1083
1084 /* timers  */
1085
1086 static int get_timer(QEMUFile *f, void *pv, size_t size)
1087 {
1088     QEMUTimer *v = pv;
1089     qemu_get_timer(f, v);
1090     return 0;
1091 }
1092
1093 static void put_timer(QEMUFile *f, void *pv, size_t size)
1094 {
1095     QEMUTimer *v = pv;
1096     qemu_put_timer(f, v);
1097 }
1098
1099 const VMStateInfo vmstate_info_timer = {
1100     .name = "timer",
1101     .get  = get_timer,
1102     .put  = put_timer,
1103 };
1104
1105 /* uint8_t buffers */
1106
1107 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1108 {
1109     uint8_t *v = pv;
1110     qemu_get_buffer(f, v, size);
1111     return 0;
1112 }
1113
1114 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1115 {
1116     uint8_t *v = pv;
1117     qemu_put_buffer(f, v, size);
1118 }
1119
1120 const VMStateInfo vmstate_info_buffer = {
1121     .name = "buffer",
1122     .get  = get_buffer,
1123     .put  = put_buffer,
1124 };
1125
1126 /* unused buffers: space that was used for some fields that are
1127    not useful anymore */
1128
1129 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1130 {
1131     uint8_t buf[1024];
1132     int block_len;
1133
1134     while (size > 0) {
1135         block_len = MIN(sizeof(buf), size);
1136         size -= block_len;
1137         qemu_get_buffer(f, buf, block_len);
1138     }
1139    return 0;
1140 }
1141
1142 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1143 {
1144     static const uint8_t buf[1024];
1145     int block_len;
1146
1147     while (size > 0) {
1148         block_len = MIN(sizeof(buf), size);
1149         size -= block_len;
1150         qemu_put_buffer(f, buf, block_len);
1151     }
1152 }
1153
1154 const VMStateInfo vmstate_info_unused_buffer = {
1155     .name = "unused_buffer",
1156     .get  = get_unused_buffer,
1157     .put  = put_unused_buffer,
1158 };
1159
1160 typedef struct CompatEntry {
1161     char idstr[256];
1162     int instance_id;
1163 } CompatEntry;
1164
1165 typedef struct SaveStateEntry {
1166     QTAILQ_ENTRY(SaveStateEntry) entry;
1167     char idstr[256];
1168     int instance_id;
1169     int alias_id;
1170     int version_id;
1171     int section_id;
1172     SaveSetParamsHandler *set_params;
1173     SaveLiveStateHandler *save_live_state;
1174     SaveStateHandler *save_state;
1175     LoadStateHandler *load_state;
1176     const VMStateDescription *vmsd;
1177     void *opaque;
1178     CompatEntry *compat;
1179     int no_migrate;
1180 } SaveStateEntry;
1181
1182
1183 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1184     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1185 static int global_section_id;
1186
1187 static int calculate_new_instance_id(const char *idstr)
1188 {
1189     SaveStateEntry *se;
1190     int instance_id = 0;
1191
1192     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1193         if (strcmp(idstr, se->idstr) == 0
1194             && instance_id <= se->instance_id) {
1195             instance_id = se->instance_id + 1;
1196         }
1197     }
1198     return instance_id;
1199 }
1200
1201 static int calculate_compat_instance_id(const char *idstr)
1202 {
1203     SaveStateEntry *se;
1204     int instance_id = 0;
1205
1206     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1207         if (!se->compat)
1208             continue;
1209
1210         if (strcmp(idstr, se->compat->idstr) == 0
1211             && instance_id <= se->compat->instance_id) {
1212             instance_id = se->compat->instance_id + 1;
1213         }
1214     }
1215     return instance_id;
1216 }
1217
1218 /* TODO: Individual devices generally have very little idea about the rest
1219    of the system, so instance_id should be removed/replaced.
1220    Meanwhile pass -1 as instance_id if you do not already have a clearly
1221    distinguishing id for all instances of your device class. */
1222 int register_savevm_live(DeviceState *dev,
1223                          const char *idstr,
1224                          int instance_id,
1225                          int version_id,
1226                          SaveSetParamsHandler *set_params,
1227                          SaveLiveStateHandler *save_live_state,
1228                          SaveStateHandler *save_state,
1229                          LoadStateHandler *load_state,
1230                          void *opaque)
1231 {
1232     SaveStateEntry *se;
1233
1234     se = g_malloc0(sizeof(SaveStateEntry));
1235     se->version_id = version_id;
1236     se->section_id = global_section_id++;
1237     se->set_params = set_params;
1238     se->save_live_state = save_live_state;
1239     se->save_state = save_state;
1240     se->load_state = load_state;
1241     se->opaque = opaque;
1242     se->vmsd = NULL;
1243     se->no_migrate = 0;
1244
1245     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1246         char *id = dev->parent_bus->info->get_dev_path(dev);
1247         if (id) {
1248             pstrcpy(se->idstr, sizeof(se->idstr), id);
1249             pstrcat(se->idstr, sizeof(se->idstr), "/");
1250             g_free(id);
1251
1252             se->compat = g_malloc0(sizeof(CompatEntry));
1253             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1254             se->compat->instance_id = instance_id == -1 ?
1255                          calculate_compat_instance_id(idstr) : instance_id;
1256             instance_id = -1;
1257         }
1258     }
1259     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1260
1261     if (instance_id == -1) {
1262         se->instance_id = calculate_new_instance_id(se->idstr);
1263     } else {
1264         se->instance_id = instance_id;
1265     }
1266     assert(!se->compat || se->instance_id == 0);
1267     /* add at the end of list */
1268     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1269     return 0;
1270 }
1271
1272 int register_savevm(DeviceState *dev,
1273                     const char *idstr,
1274                     int instance_id,
1275                     int version_id,
1276                     SaveStateHandler *save_state,
1277                     LoadStateHandler *load_state,
1278                     void *opaque)
1279 {
1280     return register_savevm_live(dev, idstr, instance_id, version_id,
1281                                 NULL, NULL, save_state, load_state, opaque);
1282 }
1283
1284 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1285 {
1286     SaveStateEntry *se, *new_se;
1287     char id[256] = "";
1288
1289     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1290         char *path = dev->parent_bus->info->get_dev_path(dev);
1291         if (path) {
1292             pstrcpy(id, sizeof(id), path);
1293             pstrcat(id, sizeof(id), "/");
1294             g_free(path);
1295         }
1296     }
1297     pstrcat(id, sizeof(id), idstr);
1298
1299     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1300         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1301             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1302             if (se->compat) {
1303                 g_free(se->compat);
1304             }
1305             g_free(se);
1306         }
1307     }
1308 }
1309
1310 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1311                                    const VMStateDescription *vmsd,
1312                                    void *opaque, int alias_id,
1313                                    int required_for_version)
1314 {
1315     SaveStateEntry *se;
1316
1317     /* If this triggers, alias support can be dropped for the vmsd. */
1318     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1319
1320     se = g_malloc0(sizeof(SaveStateEntry));
1321     se->version_id = vmsd->version_id;
1322     se->section_id = global_section_id++;
1323     se->save_live_state = NULL;
1324     se->save_state = NULL;
1325     se->load_state = NULL;
1326     se->opaque = opaque;
1327     se->vmsd = vmsd;
1328     se->alias_id = alias_id;
1329     se->no_migrate = vmsd->unmigratable;
1330
1331     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1332         char *id = dev->parent_bus->info->get_dev_path(dev);
1333         if (id) {
1334             pstrcpy(se->idstr, sizeof(se->idstr), id);
1335             pstrcat(se->idstr, sizeof(se->idstr), "/");
1336             g_free(id);
1337
1338             se->compat = g_malloc0(sizeof(CompatEntry));
1339             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1340             se->compat->instance_id = instance_id == -1 ?
1341                          calculate_compat_instance_id(vmsd->name) : instance_id;
1342             instance_id = -1;
1343         }
1344     }
1345     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1346
1347     if (instance_id == -1) {
1348         se->instance_id = calculate_new_instance_id(se->idstr);
1349     } else {
1350         se->instance_id = instance_id;
1351     }
1352     assert(!se->compat || se->instance_id == 0);
1353     /* add at the end of list */
1354     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1355     return 0;
1356 }
1357
1358 int vmstate_register(DeviceState *dev, int instance_id,
1359                      const VMStateDescription *vmsd, void *opaque)
1360 {
1361     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1362                                           opaque, -1, 0);
1363 }
1364
1365 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1366                         void *opaque)
1367 {
1368     SaveStateEntry *se, *new_se;
1369
1370     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1371         if (se->vmsd == vmsd && se->opaque == opaque) {
1372             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1373             if (se->compat) {
1374                 g_free(se->compat);
1375             }
1376             g_free(se);
1377         }
1378     }
1379 }
1380
1381 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1382                                     void *opaque);
1383 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1384                                    void *opaque);
1385
1386 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1387                        void *opaque, int version_id)
1388 {
1389     VMStateField *field = vmsd->fields;
1390     int ret;
1391
1392     if (version_id > vmsd->version_id) {
1393         return -EINVAL;
1394     }
1395     if (version_id < vmsd->minimum_version_id_old) {
1396         return -EINVAL;
1397     }
1398     if  (version_id < vmsd->minimum_version_id) {
1399         return vmsd->load_state_old(f, opaque, version_id);
1400     }
1401     if (vmsd->pre_load) {
1402         int ret = vmsd->pre_load(opaque);
1403         if (ret)
1404             return ret;
1405     }
1406     while(field->name) {
1407         if ((field->field_exists &&
1408              field->field_exists(opaque, version_id)) ||
1409             (!field->field_exists &&
1410              field->version_id <= version_id)) {
1411             void *base_addr = opaque + field->offset;
1412             int i, n_elems = 1;
1413             int size = field->size;
1414
1415             if (field->flags & VMS_VBUFFER) {
1416                 size = *(int32_t *)(opaque+field->size_offset);
1417                 if (field->flags & VMS_MULTIPLY) {
1418                     size *= field->size;
1419                 }
1420             }
1421             if (field->flags & VMS_ARRAY) {
1422                 n_elems = field->num;
1423             } else if (field->flags & VMS_VARRAY_INT32) {
1424                 n_elems = *(int32_t *)(opaque+field->num_offset);
1425             } else if (field->flags & VMS_VARRAY_UINT32) {
1426                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1427             } else if (field->flags & VMS_VARRAY_UINT16) {
1428                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1429             } else if (field->flags & VMS_VARRAY_UINT8) {
1430                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1431             }
1432             if (field->flags & VMS_POINTER) {
1433                 base_addr = *(void **)base_addr + field->start;
1434             }
1435             for (i = 0; i < n_elems; i++) {
1436                 void *addr = base_addr + size * i;
1437
1438                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1439                     addr = *(void **)addr;
1440                 }
1441                 if (field->flags & VMS_STRUCT) {
1442                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1443                 } else {
1444                     ret = field->info->get(f, addr, size);
1445
1446                 }
1447                 if (ret < 0) {
1448                     return ret;
1449                 }
1450             }
1451         }
1452         field++;
1453     }
1454     ret = vmstate_subsection_load(f, vmsd, opaque);
1455     if (ret != 0) {
1456         return ret;
1457     }
1458     if (vmsd->post_load) {
1459         return vmsd->post_load(opaque, version_id);
1460     }
1461     return 0;
1462 }
1463
1464 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1465                         void *opaque)
1466 {
1467     VMStateField *field = vmsd->fields;
1468
1469     if (vmsd->pre_save) {
1470         vmsd->pre_save(opaque);
1471     }
1472     while(field->name) {
1473         if (!field->field_exists ||
1474             field->field_exists(opaque, vmsd->version_id)) {
1475             void *base_addr = opaque + field->offset;
1476             int i, n_elems = 1;
1477             int size = field->size;
1478
1479             if (field->flags & VMS_VBUFFER) {
1480                 size = *(int32_t *)(opaque+field->size_offset);
1481                 if (field->flags & VMS_MULTIPLY) {
1482                     size *= field->size;
1483                 }
1484             }
1485             if (field->flags & VMS_ARRAY) {
1486                 n_elems = field->num;
1487             } else if (field->flags & VMS_VARRAY_INT32) {
1488                 n_elems = *(int32_t *)(opaque+field->num_offset);
1489             } else if (field->flags & VMS_VARRAY_UINT32) {
1490                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1491             } else if (field->flags & VMS_VARRAY_UINT16) {
1492                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1493             } else if (field->flags & VMS_VARRAY_UINT8) {
1494                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1495             }
1496             if (field->flags & VMS_POINTER) {
1497                 base_addr = *(void **)base_addr + field->start;
1498             }
1499             for (i = 0; i < n_elems; i++) {
1500                 void *addr = base_addr + size * i;
1501
1502                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1503                     addr = *(void **)addr;
1504                 }
1505                 if (field->flags & VMS_STRUCT) {
1506                     vmstate_save_state(f, field->vmsd, addr);
1507                 } else {
1508                     field->info->put(f, addr, size);
1509                 }
1510             }
1511         }
1512         field++;
1513     }
1514     vmstate_subsection_save(f, vmsd, opaque);
1515 }
1516
1517 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1518 {
1519     if (!se->vmsd) {         /* Old style */
1520         return se->load_state(f, se->opaque, version_id);
1521     }
1522     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1523 }
1524
1525 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1526 {
1527     if (!se->vmsd) {         /* Old style */
1528         se->save_state(f, se->opaque);
1529         return;
1530     }
1531     vmstate_save_state(f,se->vmsd, se->opaque);
1532 }
1533
1534 #define QEMU_VM_FILE_MAGIC           0x5145564d
1535 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1536 #define QEMU_VM_FILE_VERSION         0x00000003
1537
1538 #define QEMU_VM_EOF                  0x00
1539 #define QEMU_VM_SECTION_START        0x01
1540 #define QEMU_VM_SECTION_PART         0x02
1541 #define QEMU_VM_SECTION_END          0x03
1542 #define QEMU_VM_SECTION_FULL         0x04
1543 #define QEMU_VM_SUBSECTION           0x05
1544
1545 bool qemu_savevm_state_blocked(Monitor *mon)
1546 {
1547     SaveStateEntry *se;
1548
1549     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1550         if (se->no_migrate) {
1551             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1552                            se->idstr);
1553             return true;
1554         }
1555     }
1556     return false;
1557 }
1558
1559 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1560                             int shared)
1561 {
1562     SaveStateEntry *se;
1563     int ret;
1564
1565     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1566         if(se->set_params == NULL) {
1567             continue;
1568         }
1569         se->set_params(blk_enable, shared, se->opaque);
1570     }
1571
1572     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1573     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1574
1575     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1576         int len;
1577
1578         if (se->save_live_state == NULL)
1579             continue;
1580
1581         /* Section type */
1582         qemu_put_byte(f, QEMU_VM_SECTION_START);
1583         qemu_put_be32(f, se->section_id);
1584
1585         /* ID string */
1586         len = strlen(se->idstr);
1587         qemu_put_byte(f, len);
1588         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1589
1590         qemu_put_be32(f, se->instance_id);
1591         qemu_put_be32(f, se->version_id);
1592
1593         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1594         if (ret < 0) {
1595             qemu_savevm_state_cancel(mon, f);
1596             return ret;
1597         }
1598     }
1599     ret = qemu_file_get_error(f);
1600     if (ret != 0) {
1601         qemu_savevm_state_cancel(mon, f);
1602     }
1603
1604     return ret;
1605
1606 }
1607
1608 /*
1609  * this function has three return values:
1610  *   negative: there was one error, and we have -errno.
1611  *   0 : We haven't finished, caller have to go again
1612  *   1 : We have finished, we can go to complete phase
1613  */
1614 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1615 {
1616     SaveStateEntry *se;
1617     int ret = 1;
1618
1619     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1620         if (se->save_live_state == NULL)
1621             continue;
1622
1623         /* Section type */
1624         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1625         qemu_put_be32(f, se->section_id);
1626
1627         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1628         if (ret <= 0) {
1629             /* Do not proceed to the next vmstate before this one reported
1630                completion of the current stage. This serializes the migration
1631                and reduces the probability that a faster changing state is
1632                synchronized over and over again. */
1633             break;
1634         }
1635     }
1636     if (ret != 0) {
1637         return ret;
1638     }
1639     ret = qemu_file_get_error(f);
1640     if (ret != 0) {
1641         qemu_savevm_state_cancel(mon, f);
1642     }
1643     return ret;
1644 }
1645
1646 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1647 {
1648     SaveStateEntry *se;
1649     int ret;
1650
1651     cpu_synchronize_all_states();
1652
1653     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1654         if (se->save_live_state == NULL)
1655             continue;
1656
1657         /* Section type */
1658         qemu_put_byte(f, QEMU_VM_SECTION_END);
1659         qemu_put_be32(f, se->section_id);
1660
1661         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1662         if (ret < 0) {
1663             return ret;
1664         }
1665     }
1666
1667     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1668         int len;
1669
1670         if (se->save_state == NULL && se->vmsd == NULL)
1671             continue;
1672
1673         /* Section type */
1674         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1675         qemu_put_be32(f, se->section_id);
1676
1677         /* ID string */
1678         len = strlen(se->idstr);
1679         qemu_put_byte(f, len);
1680         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1681
1682         qemu_put_be32(f, se->instance_id);
1683         qemu_put_be32(f, se->version_id);
1684
1685         vmstate_save(f, se);
1686     }
1687
1688     qemu_put_byte(f, QEMU_VM_EOF);
1689
1690     return qemu_file_get_error(f);
1691 }
1692
1693 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1694 {
1695     SaveStateEntry *se;
1696
1697     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1698         if (se->save_live_state) {
1699             se->save_live_state(mon, f, -1, se->opaque);
1700         }
1701     }
1702 }
1703
1704 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1705 {
1706     int ret;
1707
1708     if (qemu_savevm_state_blocked(mon)) {
1709         ret = -EINVAL;
1710         goto out;
1711     }
1712
1713     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1714     if (ret < 0)
1715         goto out;
1716
1717     do {
1718         ret = qemu_savevm_state_iterate(mon, f);
1719         if (ret < 0)
1720             goto out;
1721     } while (ret == 0);
1722
1723     ret = qemu_savevm_state_complete(mon, f);
1724
1725 out:
1726     if (ret == 0) {
1727         ret = qemu_file_get_error(f);
1728     }
1729
1730     return ret;
1731 }
1732
1733 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1734 {
1735     SaveStateEntry *se;
1736
1737     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1738         if (!strcmp(se->idstr, idstr) &&
1739             (instance_id == se->instance_id ||
1740              instance_id == se->alias_id))
1741             return se;
1742         /* Migrating from an older version? */
1743         if (strstr(se->idstr, idstr) && se->compat) {
1744             if (!strcmp(se->compat->idstr, idstr) &&
1745                 (instance_id == se->compat->instance_id ||
1746                  instance_id == se->alias_id))
1747                 return se;
1748         }
1749     }
1750     return NULL;
1751 }
1752
1753 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1754 {
1755     while(sub && sub->needed) {
1756         if (strcmp(idstr, sub->vmsd->name) == 0) {
1757             return sub->vmsd;
1758         }
1759         sub++;
1760     }
1761     return NULL;
1762 }
1763
1764 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1765                                    void *opaque)
1766 {
1767     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1768         char idstr[256];
1769         int ret;
1770         uint8_t version_id, len, size;
1771         const VMStateDescription *sub_vmsd;
1772
1773         len = qemu_peek_byte(f, 1);
1774         if (len < strlen(vmsd->name) + 1) {
1775             /* subsection name has be be "section_name/a" */
1776             return 0;
1777         }
1778         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1779         if (size != len) {
1780             return 0;
1781         }
1782         idstr[size] = 0;
1783
1784         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1785             /* it don't have a valid subsection name */
1786             return 0;
1787         }
1788         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1789         if (sub_vmsd == NULL) {
1790             return -ENOENT;
1791         }
1792         qemu_file_skip(f, 1); /* subsection */
1793         qemu_file_skip(f, 1); /* len */
1794         qemu_file_skip(f, len); /* idstr */
1795         version_id = qemu_get_be32(f);
1796
1797         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1798         if (ret) {
1799             return ret;
1800         }
1801     }
1802     return 0;
1803 }
1804
1805 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1806                                     void *opaque)
1807 {
1808     const VMStateSubsection *sub = vmsd->subsections;
1809
1810     while (sub && sub->needed) {
1811         if (sub->needed(opaque)) {
1812             const VMStateDescription *vmsd = sub->vmsd;
1813             uint8_t len;
1814
1815             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1816             len = strlen(vmsd->name);
1817             qemu_put_byte(f, len);
1818             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1819             qemu_put_be32(f, vmsd->version_id);
1820             vmstate_save_state(f, vmsd, opaque);
1821         }
1822         sub++;
1823     }
1824 }
1825
1826 typedef struct LoadStateEntry {
1827     QLIST_ENTRY(LoadStateEntry) entry;
1828     SaveStateEntry *se;
1829     int section_id;
1830     int version_id;
1831 } LoadStateEntry;
1832
1833 int qemu_loadvm_state(QEMUFile *f)
1834 {
1835     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1836         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1837     LoadStateEntry *le, *new_le;
1838     uint8_t section_type;
1839     unsigned int v;
1840     int ret;
1841
1842     if (qemu_savevm_state_blocked(default_mon)) {
1843         return -EINVAL;
1844     }
1845
1846     v = qemu_get_be32(f);
1847     if (v != QEMU_VM_FILE_MAGIC)
1848         return -EINVAL;
1849
1850     v = qemu_get_be32(f);
1851     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1852         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1853         return -ENOTSUP;
1854     }
1855     if (v != QEMU_VM_FILE_VERSION)
1856         return -ENOTSUP;
1857
1858     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1859         uint32_t instance_id, version_id, section_id;
1860         SaveStateEntry *se;
1861         char idstr[257];
1862         int len;
1863
1864         switch (section_type) {
1865         case QEMU_VM_SECTION_START:
1866         case QEMU_VM_SECTION_FULL:
1867             /* Read section start */
1868             section_id = qemu_get_be32(f);
1869             len = qemu_get_byte(f);
1870             qemu_get_buffer(f, (uint8_t *)idstr, len);
1871             idstr[len] = 0;
1872             instance_id = qemu_get_be32(f);
1873             version_id = qemu_get_be32(f);
1874
1875             /* Find savevm section */
1876             se = find_se(idstr, instance_id);
1877             if (se == NULL) {
1878                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1879                 ret = -EINVAL;
1880                 goto out;
1881             }
1882
1883             /* Validate version */
1884             if (version_id > se->version_id) {
1885                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1886                         version_id, idstr, se->version_id);
1887                 ret = -EINVAL;
1888                 goto out;
1889             }
1890
1891             /* Add entry */
1892             le = g_malloc0(sizeof(*le));
1893
1894             le->se = se;
1895             le->section_id = section_id;
1896             le->version_id = version_id;
1897             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1898
1899             ret = vmstate_load(f, le->se, le->version_id);
1900             if (ret < 0) {
1901                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1902                         instance_id, idstr);
1903                 goto out;
1904             }
1905             break;
1906         case QEMU_VM_SECTION_PART:
1907         case QEMU_VM_SECTION_END:
1908             section_id = qemu_get_be32(f);
1909
1910             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1911                 if (le->section_id == section_id) {
1912                     break;
1913                 }
1914             }
1915             if (le == NULL) {
1916                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1917                 ret = -EINVAL;
1918                 goto out;
1919             }
1920
1921             ret = vmstate_load(f, le->se, le->version_id);
1922             if (ret < 0) {
1923                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1924                         section_id);
1925                 goto out;
1926             }
1927             break;
1928         default:
1929             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1930             ret = -EINVAL;
1931             goto out;
1932         }
1933     }
1934
1935     cpu_synchronize_all_post_init();
1936
1937     ret = 0;
1938
1939 out:
1940     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1941         QLIST_REMOVE(le, entry);
1942         g_free(le);
1943     }
1944
1945     if (ret == 0) {
1946         ret = qemu_file_get_error(f);
1947     }
1948
1949     return ret;
1950 }
1951
1952 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1953                               const char *name)
1954 {
1955     QEMUSnapshotInfo *sn_tab, *sn;
1956     int nb_sns, i, ret;
1957
1958     ret = -ENOENT;
1959     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1960     if (nb_sns < 0)
1961         return ret;
1962     for(i = 0; i < nb_sns; i++) {
1963         sn = &sn_tab[i];
1964         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1965             *sn_info = *sn;
1966             ret = 0;
1967             break;
1968         }
1969     }
1970     g_free(sn_tab);
1971     return ret;
1972 }
1973
1974 /*
1975  * Deletes snapshots of a given name in all opened images.
1976  */
1977 static int del_existing_snapshots(Monitor *mon, const char *name)
1978 {
1979     BlockDriverState *bs;
1980     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1981     int ret;
1982
1983     bs = NULL;
1984     while ((bs = bdrv_next(bs))) {
1985         if (bdrv_can_snapshot(bs) &&
1986             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1987         {
1988             ret = bdrv_snapshot_delete(bs, name);
1989             if (ret < 0) {
1990                 monitor_printf(mon,
1991                                "Error while deleting snapshot on '%s'\n",
1992                                bdrv_get_device_name(bs));
1993                 return -1;
1994             }
1995         }
1996     }
1997
1998     return 0;
1999 }
2000
2001 void do_savevm(Monitor *mon, const QDict *qdict)
2002 {
2003     BlockDriverState *bs, *bs1;
2004     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2005     int ret;
2006     QEMUFile *f;
2007     int saved_vm_running;
2008     uint64_t vm_state_size;
2009 #ifdef _WIN32
2010     struct _timeb tb;
2011     struct tm *ptm;
2012 #else
2013     struct timeval tv;
2014     struct tm tm;
2015 #endif
2016     const char *name = qdict_get_try_str(qdict, "name");
2017
2018     /* Verify if there is a device that doesn't support snapshots and is writable */
2019     bs = NULL;
2020     while ((bs = bdrv_next(bs))) {
2021
2022         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2023             continue;
2024         }
2025
2026         if (!bdrv_can_snapshot(bs)) {
2027             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2028                                bdrv_get_device_name(bs));
2029             return;
2030         }
2031     }
2032
2033     bs = bdrv_snapshots();
2034     if (!bs) {
2035         monitor_printf(mon, "No block device can accept snapshots\n");
2036         return;
2037     }
2038
2039     saved_vm_running = runstate_is_running();
2040     vm_stop(RUN_STATE_SAVE_VM);
2041
2042     memset(sn, 0, sizeof(*sn));
2043
2044     /* fill auxiliary fields */
2045 #ifdef _WIN32
2046     _ftime(&tb);
2047     sn->date_sec = tb.time;
2048     sn->date_nsec = tb.millitm * 1000000;
2049 #else
2050     gettimeofday(&tv, NULL);
2051     sn->date_sec = tv.tv_sec;
2052     sn->date_nsec = tv.tv_usec * 1000;
2053 #endif
2054     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2055
2056     if (name) {
2057         ret = bdrv_snapshot_find(bs, old_sn, name);
2058         if (ret >= 0) {
2059             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2060             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2061         } else {
2062             pstrcpy(sn->name, sizeof(sn->name), name);
2063         }
2064     } else {
2065 #ifdef _WIN32
2066         ptm = localtime(&tb.time);
2067         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2068 #else
2069         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2070         localtime_r((const time_t *)&tv.tv_sec, &tm);
2071         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2072 #endif
2073     }
2074
2075     /* Delete old snapshots of the same name */
2076     if (name && del_existing_snapshots(mon, name) < 0) {
2077         goto the_end;
2078     }
2079
2080     /* save the VM state */
2081     f = qemu_fopen_bdrv(bs, 1);
2082     if (!f) {
2083         monitor_printf(mon, "Could not open VM state file\n");
2084         goto the_end;
2085     }
2086     ret = qemu_savevm_state(mon, f);
2087     vm_state_size = qemu_ftell(f);
2088     qemu_fclose(f);
2089     if (ret < 0) {
2090         monitor_printf(mon, "Error %d while writing VM\n", ret);
2091         goto the_end;
2092     }
2093
2094     /* create the snapshots */
2095
2096     bs1 = NULL;
2097     while ((bs1 = bdrv_next(bs1))) {
2098         if (bdrv_can_snapshot(bs1)) {
2099             /* Write VM state size only to the image that contains the state */
2100             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2101             ret = bdrv_snapshot_create(bs1, sn);
2102             if (ret < 0) {
2103                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2104                                bdrv_get_device_name(bs1));
2105             }
2106         }
2107     }
2108
2109  the_end:
2110     if (saved_vm_running)
2111         vm_start();
2112 }
2113
2114 int load_vmstate(const char *name)
2115 {
2116     BlockDriverState *bs, *bs_vm_state;
2117     QEMUSnapshotInfo sn;
2118     QEMUFile *f;
2119     int ret;
2120
2121     bs_vm_state = bdrv_snapshots();
2122     if (!bs_vm_state) {
2123         error_report("No block device supports snapshots");
2124         return -ENOTSUP;
2125     }
2126
2127     /* Don't even try to load empty VM states */
2128     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2129     if (ret < 0) {
2130         return ret;
2131     } else if (sn.vm_state_size == 0) {
2132         error_report("This is a disk-only snapshot. Revert to it offline "
2133             "using qemu-img.");
2134         return -EINVAL;
2135     }
2136
2137     /* Verify if there is any device that doesn't support snapshots and is
2138     writable and check if the requested snapshot is available too. */
2139     bs = NULL;
2140     while ((bs = bdrv_next(bs))) {
2141
2142         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2143             continue;
2144         }
2145
2146         if (!bdrv_can_snapshot(bs)) {
2147             error_report("Device '%s' is writable but does not support snapshots.",
2148                                bdrv_get_device_name(bs));
2149             return -ENOTSUP;
2150         }
2151
2152         ret = bdrv_snapshot_find(bs, &sn, name);
2153         if (ret < 0) {
2154             error_report("Device '%s' does not have the requested snapshot '%s'",
2155                            bdrv_get_device_name(bs), name);
2156             return ret;
2157         }
2158     }
2159
2160     /* Flush all IO requests so they don't interfere with the new state.  */
2161     bdrv_drain_all();
2162
2163     bs = NULL;
2164     while ((bs = bdrv_next(bs))) {
2165         if (bdrv_can_snapshot(bs)) {
2166             ret = bdrv_snapshot_goto(bs, name);
2167             if (ret < 0) {
2168                 error_report("Error %d while activating snapshot '%s' on '%s'",
2169                              ret, name, bdrv_get_device_name(bs));
2170                 return ret;
2171             }
2172         }
2173     }
2174
2175     /* restore the VM state */
2176     f = qemu_fopen_bdrv(bs_vm_state, 0);
2177     if (!f) {
2178         error_report("Could not open VM state file");
2179         return -EINVAL;
2180     }
2181
2182     qemu_system_reset(VMRESET_SILENT);
2183     ret = qemu_loadvm_state(f);
2184
2185     qemu_fclose(f);
2186     if (ret < 0) {
2187         error_report("Error %d while loading VM state", ret);
2188         return ret;
2189     }
2190
2191     return 0;
2192 }
2193
2194 void do_delvm(Monitor *mon, const QDict *qdict)
2195 {
2196     BlockDriverState *bs, *bs1;
2197     int ret;
2198     const char *name = qdict_get_str(qdict, "name");
2199
2200     bs = bdrv_snapshots();
2201     if (!bs) {
2202         monitor_printf(mon, "No block device supports snapshots\n");
2203         return;
2204     }
2205
2206     bs1 = NULL;
2207     while ((bs1 = bdrv_next(bs1))) {
2208         if (bdrv_can_snapshot(bs1)) {
2209             ret = bdrv_snapshot_delete(bs1, name);
2210             if (ret < 0) {
2211                 if (ret == -ENOTSUP)
2212                     monitor_printf(mon,
2213                                    "Snapshots not supported on device '%s'\n",
2214                                    bdrv_get_device_name(bs1));
2215                 else
2216                     monitor_printf(mon, "Error %d while deleting snapshot on "
2217                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2218             }
2219         }
2220     }
2221 }
2222
2223 void do_info_snapshots(Monitor *mon)
2224 {
2225     BlockDriverState *bs, *bs1;
2226     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2227     int nb_sns, i, ret, available;
2228     int total;
2229     int *available_snapshots;
2230     char buf[256];
2231
2232     bs = bdrv_snapshots();
2233     if (!bs) {
2234         monitor_printf(mon, "No available block device supports snapshots\n");
2235         return;
2236     }
2237
2238     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2239     if (nb_sns < 0) {
2240         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2241         return;
2242     }
2243
2244     if (nb_sns == 0) {
2245         monitor_printf(mon, "There is no snapshot available.\n");
2246         return;
2247     }
2248
2249     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2250     total = 0;
2251     for (i = 0; i < nb_sns; i++) {
2252         sn = &sn_tab[i];
2253         available = 1;
2254         bs1 = NULL;
2255
2256         while ((bs1 = bdrv_next(bs1))) {
2257             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2258                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2259                 if (ret < 0) {
2260                     available = 0;
2261                     break;
2262                 }
2263             }
2264         }
2265
2266         if (available) {
2267             available_snapshots[total] = i;
2268             total++;
2269         }
2270     }
2271
2272     if (total > 0) {
2273         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2274         for (i = 0; i < total; i++) {
2275             sn = &sn_tab[available_snapshots[i]];
2276             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2277         }
2278     } else {
2279         monitor_printf(mon, "There is no suitable snapshot available\n");
2280     }
2281
2282     g_free(sn_tab);
2283     g_free(available_snapshots);
2284
2285 }
2286
2287 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2288 {
2289     qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2290                        memory_region_name(mr), dev);
2291 }
2292
2293 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2294 {
2295     /* Nothing do to while the implementation is in RAMBlock */
2296 }
2297
2298 void vmstate_register_ram_global(MemoryRegion *mr)
2299 {
2300     vmstate_register_ram(mr, NULL);
2301 }