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 #include "qmp-commands.h"
  88 #include "trace.h"
  89
  90 #define SELF_ANNOUNCE_ROUNDS 5
  91
  92 #ifndef ETH_P_RARP
  93 #define ETH_P_RARP 0x8035
  94 #endif
  95 #define ARP_HTYPE_ETH 0x0001
  96 #define ARP_PTYPE_IP 0x0800
  97 #define ARP_OP_REQUEST_REV 0x3
  98
  99 static int announce_self_create(uint8_t *buf,
 100                                 uint8_t *mac_addr)
 101 {
 102     /* Ethernet header. */
 103     memset(buf, 0xff, 6);         /* destination MAC addr */
 104     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 105     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 106
 107     /* RARP header. */
 108     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 109     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 110     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 111     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 112     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 113     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 114     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 115     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 116     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 117
 118     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 119     memset(buf + 42, 0x00, 18);
 120
 121     return 60; /* len (FCS will be added by hardware) */
 122 }
 123
 124 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 125 {
 126     uint8_t buf[60];
 127     int len;
 128
 129     len = announce_self_create(buf, nic->conf->macaddr.a);
 130
 131     qemu_send_packet_raw(&nic->nc, buf, len);
 132 }
 133
 134
 135 static void qemu_announce_self_once(void *opaque)
 136 {
 137     static int count = SELF_ANNOUNCE_ROUNDS;
 138     QEMUTimer *timer = *(QEMUTimer **)opaque;
 139
 140     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 141
 142     if (--count) {
 143         /* delay 50ms, 150ms, 250ms, ... */
 144         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 145                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 146     } else {
 147             qemu_del_timer(timer);
 148             qemu_free_timer(timer);
 149     }
 150 }
 151
 152 void qemu_announce_self(void)
 153 {
 154         static QEMUTimer *timer;
 155         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 156         qemu_announce_self_once(&timer);
 157 }
 158
 159 /***********************************************************/
 160 /* savevm/loadvm support */
 161
 162 #define IO_BUF_SIZE 32768
 163
 164 struct QEMUFile {
 165     QEMUFilePutBufferFunc *put_buffer;
 166     QEMUFileGetBufferFunc *get_buffer;
 167     QEMUFileCloseFunc *close;
 168     QEMUFileRateLimit *rate_limit;
 169     QEMUFileSetRateLimit *set_rate_limit;
 170     QEMUFileGetRateLimit *get_rate_limit;
 171     void *opaque;
 172     int is_write;
 173
 174     int64_t buf_offset; /* start of buffer when writing, end of buffer
 175                            when reading */
 176     int buf_index;
 177     int buf_size; /* 0 when writing */
 178     uint8_t buf[IO_BUF_SIZE];
 179
 180     int last_error;
 181 };
 182
 183 typedef struct QEMUFileStdio
 184 {
 185     FILE *stdio_file;
 186     QEMUFile *file;
 187 } QEMUFileStdio;
 188
 189 typedef struct QEMUFileSocket
 190 {
 191     int fd;
 192     QEMUFile *file;
 193 } QEMUFileSocket;
 194
 195 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 196 {
 197     QEMUFileSocket *s = opaque;
 198     ssize_t len;
 199
 200     do {
 201         len = qemu_recv(s->fd, buf, size, 0);
 202     } while (len == -1 && socket_error() == EINTR);
 203
 204     if (len == -1)
 205         len = -socket_error();
 206
 207     return len;
 208 }
 209
 210 static int socket_close(void *opaque)
 211 {
 212     QEMUFileSocket *s = opaque;
 213     g_free(s);
 214     return 0;
 215 }
 216
 217 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 218 {
 219     QEMUFileStdio *s = opaque;
 220     return fwrite(buf, 1, size, s->stdio_file);
 221 }
 222
 223 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 224 {
 225     QEMUFileStdio *s = opaque;
 226     FILE *fp = s->stdio_file;
 227     int bytes;
 228
 229     do {
 230         clearerr(fp);
 231         bytes = fread(buf, 1, size, fp);
 232     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 233     return bytes;
 234 }
 235
 236 static int stdio_pclose(void *opaque)
 237 {
 238     QEMUFileStdio *s = opaque;
 239     int ret;
 240     ret = pclose(s->stdio_file);
 241     if (ret == -1) {
 242         ret = -errno;
 243     }
 244     g_free(s);
 245     return ret;
 246 }
 247
 248 static int stdio_fclose(void *opaque)
 249 {
 250     QEMUFileStdio *s = opaque;
 251     int ret = 0;
 252     if (fclose(s->stdio_file) == EOF) {
 253         ret = -errno;
 254     }
 255     g_free(s);
 256     return ret;
 257 }
 258
 259 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 260 {
 261     QEMUFileStdio *s;
 262
 263     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 264         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 265         return NULL;
 266     }
 267
 268     s = g_malloc0(sizeof(QEMUFileStdio));
 269
 270     s->stdio_file = stdio_file;
 271
 272     if(mode[0] == 'r') {
 273         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 274                                  NULL, NULL, NULL);
 275     } else {
 276         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 277                                  NULL, NULL, NULL);
 278     }
 279     return s->file;
 280 }
 281
 282 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 283 {
 284     FILE *popen_file;
 285
 286     popen_file = popen(command, mode);
 287     if(popen_file == NULL) {
 288         return NULL;
 289     }
 290
 291     return qemu_popen(popen_file, mode);
 292 }
 293
 294 int qemu_stdio_fd(QEMUFile *f)
 295 {
 296     QEMUFileStdio *p;
 297     int fd;
 298
 299     p = (QEMUFileStdio *)f->opaque;
 300     fd = fileno(p->stdio_file);
 301
 302     return fd;
 303 }
 304
 305 QEMUFile *qemu_fdopen(int fd, const char *mode)
 306 {
 307     QEMUFileStdio *s;
 308
 309     if (mode == NULL ||
 310         (mode[0] != 'r' && mode[0] != 'w') ||
 311         mode[1] != 'b' || mode[2] != 0) {
 312         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 313         return NULL;
 314     }
 315
 316     s = g_malloc0(sizeof(QEMUFileStdio));
 317     s->stdio_file = fdopen(fd, mode);
 318     if (!s->stdio_file)
 319         goto fail;
 320
 321     if(mode[0] == 'r') {
 322         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 323                                  NULL, NULL, NULL);
 324     } else {
 325         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 326                                  NULL, NULL, NULL);
 327     }
 328     return s->file;
 329
 330 fail:
 331     g_free(s);
 332     return NULL;
 333 }
 334
 335 QEMUFile *qemu_fopen_socket(int fd)
 336 {
 337     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 338
 339     s->fd = fd;
 340     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 341                              NULL, NULL, NULL);
 342     return s->file;
 343 }
 344
 345 static int file_put_buffer(void *opaque, const uint8_t *buf,
 346                             int64_t pos, int size)
 347 {
 348     QEMUFileStdio *s = opaque;
 349     fseek(s->stdio_file, pos, SEEK_SET);
 350     return fwrite(buf, 1, size, s->stdio_file);
 351 }
 352
 353 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 354 {
 355     QEMUFileStdio *s = opaque;
 356     fseek(s->stdio_file, pos, SEEK_SET);
 357     return fread(buf, 1, size, s->stdio_file);
 358 }
 359
 360 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 361 {
 362     QEMUFileStdio *s;
 363
 364     if (mode == NULL ||
 365         (mode[0] != 'r' && mode[0] != 'w') ||
 366         mode[1] != 'b' || mode[2] != 0) {
 367         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 368         return NULL;
 369     }
 370
 371     s = g_malloc0(sizeof(QEMUFileStdio));
 372
 373     s->stdio_file = fopen(filename, mode);
 374     if (!s->stdio_file)
 375         goto fail;
 376
 377     if(mode[0] == 'w') {
 378         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 379                                  NULL, NULL, NULL);
 380     } else {
 381         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 382                                NULL, NULL, NULL);
 383     }
 384     return s->file;
 385 fail:
 386     g_free(s);
 387     return NULL;
 388 }
 389
 390 static int block_put_buffer(void *opaque, const uint8_t *buf,
 391                            int64_t pos, int size)
 392 {
 393     bdrv_save_vmstate(opaque, buf, pos, size);
 394     return size;
 395 }
 396
 397 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 398 {
 399     return bdrv_load_vmstate(opaque, buf, pos, size);
 400 }
 401
 402 static int bdrv_fclose(void *opaque)
 403 {
 404     return bdrv_flush(opaque);
 405 }
 406
 407 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 408 {
 409     if (is_writable)
 410         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 411                               NULL, NULL, NULL);
 412     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 413 }
 414
 415 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 416                          QEMUFileGetBufferFunc *get_buffer,
 417                          QEMUFileCloseFunc *close,
 418                          QEMUFileRateLimit *rate_limit,
 419                          QEMUFileSetRateLimit *set_rate_limit,
 420                          QEMUFileGetRateLimit *get_rate_limit)
 421 {
 422     QEMUFile *f;
 423
 424     f = g_malloc0(sizeof(QEMUFile));
 425
 426     f->opaque = opaque;
 427     f->put_buffer = put_buffer;
 428     f->get_buffer = get_buffer;
 429     f->close = close;
 430     f->rate_limit = rate_limit;
 431     f->set_rate_limit = set_rate_limit;
 432     f->get_rate_limit = get_rate_limit;
 433     f->is_write = 0;
 434
 435     return f;
 436 }
 437
 438 int qemu_file_get_error(QEMUFile *f)
 439 {
 440     return f->last_error;
 441 }
 442
 443 void qemu_file_set_error(QEMUFile *f, int ret)
 444 {
 445     f->last_error = ret;
 446 }
 447
 448 /** Sets last_error conditionally
 449  *
 450  * Sets last_error only if ret is negative _and_ no error
 451  * was set before.
 452  */
 453 static void qemu_file_set_if_error(QEMUFile *f, int ret)
 454 {
 455     if (ret < 0 && !f->last_error) {
 456         qemu_file_set_error(f, ret);
 457     }
 458 }
 459
 460 /** Flushes QEMUFile buffer
 461  *
 462  * In case of error, last_error is set.
 463  */
 464 void qemu_fflush(QEMUFile *f)
 465 {
 466     if (!f->put_buffer)
 467         return;
 468
 469     if (f->is_write && f->buf_index > 0) {
 470         int len;
 471
 472         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 473         if (len > 0)
 474             f->buf_offset += f->buf_index;
 475         else
 476             qemu_file_set_error(f, -EINVAL);
 477         f->buf_index = 0;
 478     }
 479 }
 480
 481 static void qemu_fill_buffer(QEMUFile *f)
 482 {
 483     int len;
 484     int pending;
 485
 486     if (!f->get_buffer)
 487         return;
 488
 489     if (f->is_write)
 490         abort();
 491
 492     pending = f->buf_size - f->buf_index;
 493     if (pending > 0) {
 494         memmove(f->buf, f->buf + f->buf_index, pending);
 495     }
 496     f->buf_index = 0;
 497     f->buf_size = pending;
 498
 499     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 500                         IO_BUF_SIZE - pending);
 501     if (len > 0) {
 502         f->buf_size += len;
 503         f->buf_offset += len;
 504     } else if (len == 0) {
 505         f->last_error = -EIO;
 506     } else if (len != -EAGAIN)
 507         qemu_file_set_error(f, len);
 508 }
 509
 510 /** Calls close function and set last_error if needed
 511  *
 512  * Internal function. qemu_fflush() must be called before this.
 513  *
 514  * Returns f->close() return value, or 0 if close function is not set.
 515  */
 516 static int qemu_close(QEMUFile *f)
 517 {
 518     int ret = 0;
 519     if (f->close) {
 520         ret = f->close(f->opaque);
 521         qemu_file_set_if_error(f, ret);
 522     }
 523     return ret;
 524 }
 525
 526 /** Closes the file
 527  *
 528  * Returns negative error value if any error happened on previous operations or
 529  * while closing the file. Returns 0 or positive number on success.
 530  *
 531  * The meaning of return value on success depends on the specific backend
 532  * being used.
 533  */
 534 int qemu_fclose(QEMUFile *f)
 535 {
 536     int ret;
 537     qemu_fflush(f);
 538     ret = qemu_close(f);
 539     /* If any error was spotted before closing, we should report it
 540      * instead of the close() return value.
 541      */
 542     if (f->last_error) {
 543         ret = f->last_error;
 544     }
 545     g_free(f);
 546     return ret;
 547 }
 548
 549 void qemu_file_put_notify(QEMUFile *f)
 550 {
 551     f->put_buffer(f->opaque, NULL, 0, 0);
 552 }
 553
 554 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 555 {
 556     int l;
 557
 558     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 559         fprintf(stderr,
 560                 "Attempted to write to buffer while read buffer is not empty\n");
 561         abort();
 562     }
 563
 564     while (!f->last_error && size > 0) {
 565         l = IO_BUF_SIZE - f->buf_index;
 566         if (l > size)
 567             l = size;
 568         memcpy(f->buf + f->buf_index, buf, l);
 569         f->is_write = 1;
 570         f->buf_index += l;
 571         buf += l;
 572         size -= l;
 573         if (f->buf_index >= IO_BUF_SIZE)
 574             qemu_fflush(f);
 575     }
 576 }
 577
 578 void qemu_put_byte(QEMUFile *f, int v)
 579 {
 580     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 581         fprintf(stderr,
 582                 "Attempted to write to buffer while read buffer is not empty\n");
 583         abort();
 584     }
 585
 586     f->buf[f->buf_index++] = v;
 587     f->is_write = 1;
 588     if (f->buf_index >= IO_BUF_SIZE)
 589         qemu_fflush(f);
 590 }
 591
 592 static void qemu_file_skip(QEMUFile *f, int size)
 593 {
 594     if (f->buf_index + size <= f->buf_size) {
 595         f->buf_index += size;
 596     }
 597 }
 598
 599 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 600 {
 601     int pending;
 602     int index;
 603
 604     if (f->is_write) {
 605         abort();
 606     }
 607
 608     index = f->buf_index + offset;
 609     pending = f->buf_size - index;
 610     if (pending < size) {
 611         qemu_fill_buffer(f);
 612         index = f->buf_index + offset;
 613         pending = f->buf_size - index;
 614     }
 615
 616     if (pending <= 0) {
 617         return 0;
 618     }
 619     if (size > pending) {
 620         size = pending;
 621     }
 622
 623     memcpy(buf, f->buf + index, size);
 624     return size;
 625 }
 626
 627 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 628 {
 629     int pending = size;
 630     int done = 0;
 631
 632     while (pending > 0) {
 633         int res;
 634
 635         res = qemu_peek_buffer(f, buf, pending, 0);
 636         if (res == 0) {
 637             return done;
 638         }
 639         qemu_file_skip(f, res);
 640         buf += res;
 641         pending -= res;
 642         done += res;
 643     }
 644     return done;
 645 }
 646
 647 static int qemu_peek_byte(QEMUFile *f, int offset)
 648 {
 649     int index = f->buf_index + offset;
 650
 651     if (f->is_write) {
 652         abort();
 653     }
 654
 655     if (index >= f->buf_size) {
 656         qemu_fill_buffer(f);
 657         index = f->buf_index + offset;
 658         if (index >= f->buf_size) {
 659             return 0;
 660         }
 661     }
 662     return f->buf[index];
 663 }
 664
 665 int qemu_get_byte(QEMUFile *f)
 666 {
 667     int result;
 668
 669     result = qemu_peek_byte(f, 0);
 670     qemu_file_skip(f, 1);
 671     return result;
 672 }
 673
 674 int64_t qemu_ftell(QEMUFile *f)
 675 {
 676     return f->buf_offset - f->buf_size + f->buf_index;
 677 }
 678
 679 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 680 {
 681     if (whence == SEEK_SET) {
 682         /* nothing to do */
 683     } else if (whence == SEEK_CUR) {
 684         pos += qemu_ftell(f);
 685     } else {
 686         /* SEEK_END not supported */
 687         return -1;
 688     }
 689     if (f->put_buffer) {
 690         qemu_fflush(f);
 691         f->buf_offset = pos;
 692     } else {
 693         f->buf_offset = pos;
 694         f->buf_index = 0;
 695         f->buf_size = 0;
 696     }
 697     return pos;
 698 }
 699
 700 int qemu_file_rate_limit(QEMUFile *f)
 701 {
 702     if (f->rate_limit)
 703         return f->rate_limit(f->opaque);
 704
 705     return 0;
 706 }
 707
 708 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 709 {
 710     if (f->get_rate_limit)
 711         return f->get_rate_limit(f->opaque);
 712
 713     return 0;
 714 }
 715
 716 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 717 {
 718     /* any failed or completed migration keeps its state to allow probing of
 719      * migration data, but has no associated file anymore */
 720     if (f && f->set_rate_limit)
 721         return f->set_rate_limit(f->opaque, new_rate);
 722
 723     return 0;
 724 }
 725
 726 void qemu_put_be16(QEMUFile *f, unsigned int v)
 727 {
 728     qemu_put_byte(f, v >> 8);
 729     qemu_put_byte(f, v);
 730 }
 731
 732 void qemu_put_be32(QEMUFile *f, unsigned int v)
 733 {
 734     qemu_put_byte(f, v >> 24);
 735     qemu_put_byte(f, v >> 16);
 736     qemu_put_byte(f, v >> 8);
 737     qemu_put_byte(f, v);
 738 }
 739
 740 void qemu_put_be64(QEMUFile *f, uint64_t v)
 741 {
 742     qemu_put_be32(f, v >> 32);
 743     qemu_put_be32(f, v);
 744 }
 745
 746 unsigned int qemu_get_be16(QEMUFile *f)
 747 {
 748     unsigned int v;
 749     v = qemu_get_byte(f) << 8;
 750     v |= qemu_get_byte(f);
 751     return v;
 752 }
 753
 754 unsigned int qemu_get_be32(QEMUFile *f)
 755 {
 756     unsigned int v;
 757     v = qemu_get_byte(f) << 24;
 758     v |= qemu_get_byte(f) << 16;
 759     v |= qemu_get_byte(f) << 8;
 760     v |= qemu_get_byte(f);
 761     return v;
 762 }
 763
 764 uint64_t qemu_get_be64(QEMUFile *f)
 765 {
 766     uint64_t v;
 767     v = (uint64_t)qemu_get_be32(f) << 32;
 768     v |= qemu_get_be32(f);
 769     return v;
 770 }
 771
 772
 773 /* timer */
 774
 775 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 776 {
 777     uint64_t expire_time;
 778
 779     expire_time = qemu_timer_expire_time_ns(ts);
 780     qemu_put_be64(f, expire_time);
 781 }
 782
 783 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 784 {
 785     uint64_t expire_time;
 786
 787     expire_time = qemu_get_be64(f);
 788     if (expire_time != -1) {
 789         qemu_mod_timer_ns(ts, expire_time);
 790     } else {
 791         qemu_del_timer(ts);
 792     }
 793 }
 794
 795
 796 /* bool */
 797
 798 static int get_bool(QEMUFile *f, void *pv, size_t size)
 799 {
 800     bool *v = pv;
 801     *v = qemu_get_byte(f);
 802     return 0;
 803 }
 804
 805 static void put_bool(QEMUFile *f, void *pv, size_t size)
 806 {
 807     bool *v = pv;
 808     qemu_put_byte(f, *v);
 809 }
 810
 811 const VMStateInfo vmstate_info_bool = {
 812     .name = "bool",
 813     .get  = get_bool,
 814     .put  = put_bool,
 815 };
 816
 817 /* 8 bit int */
 818
 819 static int get_int8(QEMUFile *f, void *pv, size_t size)
 820 {
 821     int8_t *v = pv;
 822     qemu_get_s8s(f, v);
 823     return 0;
 824 }
 825
 826 static void put_int8(QEMUFile *f, void *pv, size_t size)
 827 {
 828     int8_t *v = pv;
 829     qemu_put_s8s(f, v);
 830 }
 831
 832 const VMStateInfo vmstate_info_int8 = {
 833     .name = "int8",
 834     .get  = get_int8,
 835     .put  = put_int8,
 836 };
 837
 838 /* 16 bit int */
 839
 840 static int get_int16(QEMUFile *f, void *pv, size_t size)
 841 {
 842     int16_t *v = pv;
 843     qemu_get_sbe16s(f, v);
 844     return 0;
 845 }
 846
 847 static void put_int16(QEMUFile *f, void *pv, size_t size)
 848 {
 849     int16_t *v = pv;
 850     qemu_put_sbe16s(f, v);
 851 }
 852
 853 const VMStateInfo vmstate_info_int16 = {
 854     .name = "int16",
 855     .get  = get_int16,
 856     .put  = put_int16,
 857 };
 858
 859 /* 32 bit int */
 860
 861 static int get_int32(QEMUFile *f, void *pv, size_t size)
 862 {
 863     int32_t *v = pv;
 864     qemu_get_sbe32s(f, v);
 865     return 0;
 866 }
 867
 868 static void put_int32(QEMUFile *f, void *pv, size_t size)
 869 {
 870     int32_t *v = pv;
 871     qemu_put_sbe32s(f, v);
 872 }
 873
 874 const VMStateInfo vmstate_info_int32 = {
 875     .name = "int32",
 876     .get  = get_int32,
 877     .put  = put_int32,
 878 };
 879
 880 /* 32 bit int. See that the received value is the same than the one
 881    in the field */
 882
 883 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 884 {
 885     int32_t *v = pv;
 886     int32_t v2;
 887     qemu_get_sbe32s(f, &v2);
 888
 889     if (*v == v2)
 890         return 0;
 891     return -EINVAL;
 892 }
 893
 894 const VMStateInfo vmstate_info_int32_equal = {
 895     .name = "int32 equal",
 896     .get  = get_int32_equal,
 897     .put  = put_int32,
 898 };
 899
 900 /* 32 bit int. See that the received value is the less or the same
 901    than the one in the field */
 902
 903 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 904 {
 905     int32_t *old = pv;
 906     int32_t new;
 907     qemu_get_sbe32s(f, &new);
 908
 909     if (*old <= new)
 910         return 0;
 911     return -EINVAL;
 912 }
 913
 914 const VMStateInfo vmstate_info_int32_le = {
 915     .name = "int32 equal",
 916     .get  = get_int32_le,
 917     .put  = put_int32,
 918 };
 919
 920 /* 64 bit int */
 921
 922 static int get_int64(QEMUFile *f, void *pv, size_t size)
 923 {
 924     int64_t *v = pv;
 925     qemu_get_sbe64s(f, v);
 926     return 0;
 927 }
 928
 929 static void put_int64(QEMUFile *f, void *pv, size_t size)
 930 {
 931     int64_t *v = pv;
 932     qemu_put_sbe64s(f, v);
 933 }
 934
 935 const VMStateInfo vmstate_info_int64 = {
 936     .name = "int64",
 937     .get  = get_int64,
 938     .put  = put_int64,
 939 };
 940
 941 /* 8 bit unsigned int */
 942
 943 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 944 {
 945     uint8_t *v = pv;
 946     qemu_get_8s(f, v);
 947     return 0;
 948 }
 949
 950 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 951 {
 952     uint8_t *v = pv;
 953     qemu_put_8s(f, v);
 954 }
 955
 956 const VMStateInfo vmstate_info_uint8 = {
 957     .name = "uint8",
 958     .get  = get_uint8,
 959     .put  = put_uint8,
 960 };
 961
 962 /* 16 bit unsigned int */
 963
 964 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 965 {
 966     uint16_t *v = pv;
 967     qemu_get_be16s(f, v);
 968     return 0;
 969 }
 970
 971 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 972 {
 973     uint16_t *v = pv;
 974     qemu_put_be16s(f, v);
 975 }
 976
 977 const VMStateInfo vmstate_info_uint16 = {
 978     .name = "uint16",
 979     .get  = get_uint16,
 980     .put  = put_uint16,
 981 };
 982
 983 /* 32 bit unsigned int */
 984
 985 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 986 {
 987     uint32_t *v = pv;
 988     qemu_get_be32s(f, v);
 989     return 0;
 990 }
 991
 992 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 993 {
 994     uint32_t *v = pv;
 995     qemu_put_be32s(f, v);
 996 }
 997
 998 const VMStateInfo vmstate_info_uint32 = {
 999     .name = "uint32",
1000     .get  = get_uint32,
1001     .put  = put_uint32,
1002 };
1003
1004 /* 32 bit uint. See that the received value is the same than the one
1005    in the field */
1006
1007 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
1008 {
1009     uint32_t *v = pv;
1010     uint32_t v2;
1011     qemu_get_be32s(f, &v2);
1012
1013     if (*v == v2) {
1014         return 0;
1015     }
1016     return -EINVAL;
1017 }
1018
1019 const VMStateInfo vmstate_info_uint32_equal = {
1020     .name = "uint32 equal",
1021     .get  = get_uint32_equal,
1022     .put  = put_uint32,
1023 };
1024
1025 /* 64 bit unsigned int */
1026
1027 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1028 {
1029     uint64_t *v = pv;
1030     qemu_get_be64s(f, v);
1031     return 0;
1032 }
1033
1034 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1035 {
1036     uint64_t *v = pv;
1037     qemu_put_be64s(f, v);
1038 }
1039
1040 const VMStateInfo vmstate_info_uint64 = {
1041     .name = "uint64",
1042     .get  = get_uint64,
1043     .put  = put_uint64,
1044 };
1045
1046 /* 8 bit int. See that the received value is the same than the one
1047    in the field */
1048
1049 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1050 {
1051     uint8_t *v = pv;
1052     uint8_t v2;
1053     qemu_get_8s(f, &v2);
1054
1055     if (*v == v2)
1056         return 0;
1057     return -EINVAL;
1058 }
1059
1060 const VMStateInfo vmstate_info_uint8_equal = {
1061     .name = "uint8 equal",
1062     .get  = get_uint8_equal,
1063     .put  = put_uint8,
1064 };
1065
1066 /* 16 bit unsigned int int. See that the received value is the same than the one
1067    in the field */
1068
1069 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1070 {
1071     uint16_t *v = pv;
1072     uint16_t v2;
1073     qemu_get_be16s(f, &v2);
1074
1075     if (*v == v2)
1076         return 0;
1077     return -EINVAL;
1078 }
1079
1080 const VMStateInfo vmstate_info_uint16_equal = {
1081     .name = "uint16 equal",
1082     .get  = get_uint16_equal,
1083     .put  = put_uint16,
1084 };
1085
1086 /* timers  */
1087
1088 static int get_timer(QEMUFile *f, void *pv, size_t size)
1089 {
1090     QEMUTimer *v = pv;
1091     qemu_get_timer(f, v);
1092     return 0;
1093 }
1094
1095 static void put_timer(QEMUFile *f, void *pv, size_t size)
1096 {
1097     QEMUTimer *v = pv;
1098     qemu_put_timer(f, v);
1099 }
1100
1101 const VMStateInfo vmstate_info_timer = {
1102     .name = "timer",
1103     .get  = get_timer,
1104     .put  = put_timer,
1105 };
1106
1107 /* uint8_t buffers */
1108
1109 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1110 {
1111     uint8_t *v = pv;
1112     qemu_get_buffer(f, v, size);
1113     return 0;
1114 }
1115
1116 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1117 {
1118     uint8_t *v = pv;
1119     qemu_put_buffer(f, v, size);
1120 }
1121
1122 const VMStateInfo vmstate_info_buffer = {
1123     .name = "buffer",
1124     .get  = get_buffer,
1125     .put  = put_buffer,
1126 };
1127
1128 /* unused buffers: space that was used for some fields that are
1129    not useful anymore */
1130
1131 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1132 {
1133     uint8_t buf[1024];
1134     int block_len;
1135
1136     while (size > 0) {
1137         block_len = MIN(sizeof(buf), size);
1138         size -= block_len;
1139         qemu_get_buffer(f, buf, block_len);
1140     }
1141    return 0;
1142 }
1143
1144 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1145 {
1146     static const uint8_t buf[1024];
1147     int block_len;
1148
1149     while (size > 0) {
1150         block_len = MIN(sizeof(buf), size);
1151         size -= block_len;
1152         qemu_put_buffer(f, buf, block_len);
1153     }
1154 }
1155
1156 const VMStateInfo vmstate_info_unused_buffer = {
1157     .name = "unused_buffer",
1158     .get  = get_unused_buffer,
1159     .put  = put_unused_buffer,
1160 };
1161
1162 typedef struct CompatEntry {
1163     char idstr[256];
1164     int instance_id;
1165 } CompatEntry;
1166
1167 typedef struct SaveStateEntry {
1168     QTAILQ_ENTRY(SaveStateEntry) entry;
1169     char idstr[256];
1170     int instance_id;
1171     int alias_id;
1172     int version_id;
1173     int section_id;
1174     SaveSetParamsHandler *set_params;
1175     SaveLiveStateHandler *save_live_state;
1176     SaveStateHandler *save_state;
1177     LoadStateHandler *load_state;
1178     const VMStateDescription *vmsd;
1179     void *opaque;
1180     CompatEntry *compat;
1181     int no_migrate;
1182     int is_ram;
1183 } SaveStateEntry;
1184
1185
1186 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1187     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1188 static int global_section_id;
1189
1190 static int calculate_new_instance_id(const char *idstr)
1191 {
1192     SaveStateEntry *se;
1193     int instance_id = 0;
1194
1195     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1196         if (strcmp(idstr, se->idstr) == 0
1197             && instance_id <= se->instance_id) {
1198             instance_id = se->instance_id + 1;
1199         }
1200     }
1201     return instance_id;
1202 }
1203
1204 static int calculate_compat_instance_id(const char *idstr)
1205 {
1206     SaveStateEntry *se;
1207     int instance_id = 0;
1208
1209     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1210         if (!se->compat)
1211             continue;
1212
1213         if (strcmp(idstr, se->compat->idstr) == 0
1214             && instance_id <= se->compat->instance_id) {
1215             instance_id = se->compat->instance_id + 1;
1216         }
1217     }
1218     return instance_id;
1219 }
1220
1221 /* TODO: Individual devices generally have very little idea about the rest
1222    of the system, so instance_id should be removed/replaced.
1223    Meanwhile pass -1 as instance_id if you do not already have a clearly
1224    distinguishing id for all instances of your device class. */
1225 int register_savevm_live(DeviceState *dev,
1226                          const char *idstr,
1227                          int instance_id,
1228                          int version_id,
1229                          SaveSetParamsHandler *set_params,
1230                          SaveLiveStateHandler *save_live_state,
1231                          SaveStateHandler *save_state,
1232                          LoadStateHandler *load_state,
1233                          void *opaque)
1234 {
1235     SaveStateEntry *se;
1236
1237     se = g_malloc0(sizeof(SaveStateEntry));
1238     se->version_id = version_id;
1239     se->section_id = global_section_id++;
1240     se->set_params = set_params;
1241     se->save_live_state = save_live_state;
1242     se->save_state = save_state;
1243     se->load_state = load_state;
1244     se->opaque = opaque;
1245     se->vmsd = NULL;
1246     se->no_migrate = 0;
1247     /* if this is a live_savem then set is_ram */
1248     if (save_live_state != NULL) {
1249         se->is_ram = 1;
1250     }
1251
1252     if (dev) {
1253         char *id = qdev_get_dev_path(dev);
1254         if (id) {
1255             pstrcpy(se->idstr, sizeof(se->idstr), id);
1256             pstrcat(se->idstr, sizeof(se->idstr), "/");
1257             g_free(id);
1258
1259             se->compat = g_malloc0(sizeof(CompatEntry));
1260             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1261             se->compat->instance_id = instance_id == -1 ?
1262                          calculate_compat_instance_id(idstr) : instance_id;
1263             instance_id = -1;
1264         }
1265     }
1266     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1267
1268     if (instance_id == -1) {
1269         se->instance_id = calculate_new_instance_id(se->idstr);
1270     } else {
1271         se->instance_id = instance_id;
1272     }
1273     assert(!se->compat || se->instance_id == 0);
1274     /* add at the end of list */
1275     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1276     return 0;
1277 }
1278
1279 int register_savevm(DeviceState *dev,
1280                     const char *idstr,
1281                     int instance_id,
1282                     int version_id,
1283                     SaveStateHandler *save_state,
1284                     LoadStateHandler *load_state,
1285                     void *opaque)
1286 {
1287     return register_savevm_live(dev, idstr, instance_id, version_id,
1288                                 NULL, NULL, save_state, load_state, opaque);
1289 }
1290
1291 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1292 {
1293     SaveStateEntry *se, *new_se;
1294     char id[256] = "";
1295
1296     if (dev) {
1297         char *path = qdev_get_dev_path(dev);
1298         if (path) {
1299             pstrcpy(id, sizeof(id), path);
1300             pstrcat(id, sizeof(id), "/");
1301             g_free(path);
1302         }
1303     }
1304     pstrcat(id, sizeof(id), idstr);
1305
1306     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1307         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1308             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1309             if (se->compat) {
1310                 g_free(se->compat);
1311             }
1312             g_free(se);
1313         }
1314     }
1315 }
1316
1317 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1318                                    const VMStateDescription *vmsd,
1319                                    void *opaque, int alias_id,
1320                                    int required_for_version)
1321 {
1322     SaveStateEntry *se;
1323
1324     /* If this triggers, alias support can be dropped for the vmsd. */
1325     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1326
1327     se = g_malloc0(sizeof(SaveStateEntry));
1328     se->version_id = vmsd->version_id;
1329     se->section_id = global_section_id++;
1330     se->save_live_state = NULL;
1331     se->save_state = NULL;
1332     se->load_state = NULL;
1333     se->opaque = opaque;
1334     se->vmsd = vmsd;
1335     se->alias_id = alias_id;
1336     se->no_migrate = vmsd->unmigratable;
1337
1338     if (dev) {
1339         char *id = qdev_get_dev_path(dev);
1340         if (id) {
1341             pstrcpy(se->idstr, sizeof(se->idstr), id);
1342             pstrcat(se->idstr, sizeof(se->idstr), "/");
1343             g_free(id);
1344
1345             se->compat = g_malloc0(sizeof(CompatEntry));
1346             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1347             se->compat->instance_id = instance_id == -1 ?
1348                          calculate_compat_instance_id(vmsd->name) : instance_id;
1349             instance_id = -1;
1350         }
1351     }
1352     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1353
1354     if (instance_id == -1) {
1355         se->instance_id = calculate_new_instance_id(se->idstr);
1356     } else {
1357         se->instance_id = instance_id;
1358     }
1359     assert(!se->compat || se->instance_id == 0);
1360     /* add at the end of list */
1361     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1362     return 0;
1363 }
1364
1365 int vmstate_register(DeviceState *dev, int instance_id,
1366                      const VMStateDescription *vmsd, void *opaque)
1367 {
1368     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1369                                           opaque, -1, 0);
1370 }
1371
1372 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1373                         void *opaque)
1374 {
1375     SaveStateEntry *se, *new_se;
1376
1377     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1378         if (se->vmsd == vmsd && se->opaque == opaque) {
1379             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1380             if (se->compat) {
1381                 g_free(se->compat);
1382             }
1383             g_free(se);
1384         }
1385     }
1386 }
1387
1388 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1389                                     void *opaque);
1390 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1391                                    void *opaque);
1392
1393 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1394                        void *opaque, int version_id)
1395 {
1396     VMStateField *field = vmsd->fields;
1397     int ret;
1398
1399     if (version_id > vmsd->version_id) {
1400         return -EINVAL;
1401     }
1402     if (version_id < vmsd->minimum_version_id_old) {
1403         return -EINVAL;
1404     }
1405     if  (version_id < vmsd->minimum_version_id) {
1406         return vmsd->load_state_old(f, opaque, version_id);
1407     }
1408     if (vmsd->pre_load) {
1409         int ret = vmsd->pre_load(opaque);
1410         if (ret)
1411             return ret;
1412     }
1413     while(field->name) {
1414         if ((field->field_exists &&
1415              field->field_exists(opaque, version_id)) ||
1416             (!field->field_exists &&
1417              field->version_id <= version_id)) {
1418             void *base_addr = opaque + field->offset;
1419             int i, n_elems = 1;
1420             int size = field->size;
1421
1422             if (field->flags & VMS_VBUFFER) {
1423                 size = *(int32_t *)(opaque+field->size_offset);
1424                 if (field->flags & VMS_MULTIPLY) {
1425                     size *= field->size;
1426                 }
1427             }
1428             if (field->flags & VMS_ARRAY) {
1429                 n_elems = field->num;
1430             } else if (field->flags & VMS_VARRAY_INT32) {
1431                 n_elems = *(int32_t *)(opaque+field->num_offset);
1432             } else if (field->flags & VMS_VARRAY_UINT32) {
1433                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1434             } else if (field->flags & VMS_VARRAY_UINT16) {
1435                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1436             } else if (field->flags & VMS_VARRAY_UINT8) {
1437                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1438             }
1439             if (field->flags & VMS_POINTER) {
1440                 base_addr = *(void **)base_addr + field->start;
1441             }
1442             for (i = 0; i < n_elems; i++) {
1443                 void *addr = base_addr + size * i;
1444
1445                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1446                     addr = *(void **)addr;
1447                 }
1448                 if (field->flags & VMS_STRUCT) {
1449                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1450                 } else {
1451                     ret = field->info->get(f, addr, size);
1452
1453                 }
1454                 if (ret < 0) {
1455                     return ret;
1456                 }
1457             }
1458         }
1459         field++;
1460     }
1461     ret = vmstate_subsection_load(f, vmsd, opaque);
1462     if (ret != 0) {
1463         return ret;
1464     }
1465     if (vmsd->post_load) {
1466         return vmsd->post_load(opaque, version_id);
1467     }
1468     return 0;
1469 }
1470
1471 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1472                         void *opaque)
1473 {
1474     VMStateField *field = vmsd->fields;
1475
1476     if (vmsd->pre_save) {
1477         vmsd->pre_save(opaque);
1478     }
1479     while(field->name) {
1480         if (!field->field_exists ||
1481             field->field_exists(opaque, vmsd->version_id)) {
1482             void *base_addr = opaque + field->offset;
1483             int i, n_elems = 1;
1484             int size = field->size;
1485
1486             if (field->flags & VMS_VBUFFER) {
1487                 size = *(int32_t *)(opaque+field->size_offset);
1488                 if (field->flags & VMS_MULTIPLY) {
1489                     size *= field->size;
1490                 }
1491             }
1492             if (field->flags & VMS_ARRAY) {
1493                 n_elems = field->num;
1494             } else if (field->flags & VMS_VARRAY_INT32) {
1495                 n_elems = *(int32_t *)(opaque+field->num_offset);
1496             } else if (field->flags & VMS_VARRAY_UINT32) {
1497                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1498             } else if (field->flags & VMS_VARRAY_UINT16) {
1499                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1500             } else if (field->flags & VMS_VARRAY_UINT8) {
1501                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1502             }
1503             if (field->flags & VMS_POINTER) {
1504                 base_addr = *(void **)base_addr + field->start;
1505             }
1506             for (i = 0; i < n_elems; i++) {
1507                 void *addr = base_addr + size * i;
1508
1509                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1510                     addr = *(void **)addr;
1511                 }
1512                 if (field->flags & VMS_STRUCT) {
1513                     vmstate_save_state(f, field->vmsd, addr);
1514                 } else {
1515                     field->info->put(f, addr, size);
1516                 }
1517             }
1518         }
1519         field++;
1520     }
1521     vmstate_subsection_save(f, vmsd, opaque);
1522 }
1523
1524 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1525 {
1526     if (!se->vmsd) {         /* Old style */
1527         return se->load_state(f, se->opaque, version_id);
1528     }
1529     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1530 }
1531
1532 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1533 {
1534     if (!se->vmsd) {         /* Old style */
1535         se->save_state(f, se->opaque);
1536         return;
1537     }
1538     vmstate_save_state(f,se->vmsd, se->opaque);
1539 }
1540
1541 #define QEMU_VM_FILE_MAGIC           0x5145564d
1542 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1543 #define QEMU_VM_FILE_VERSION         0x00000003
1544
1545 #define QEMU_VM_EOF                  0x00
1546 #define QEMU_VM_SECTION_START        0x01
1547 #define QEMU_VM_SECTION_PART         0x02
1548 #define QEMU_VM_SECTION_END          0x03
1549 #define QEMU_VM_SECTION_FULL         0x04
1550 #define QEMU_VM_SUBSECTION           0x05
1551
1552 bool qemu_savevm_state_blocked(Error **errp)
1553 {
1554     SaveStateEntry *se;
1555
1556     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1557         if (se->no_migrate) {
1558             error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1559             return true;
1560         }
1561     }
1562     return false;
1563 }
1564
1565 int qemu_savevm_state_begin(QEMUFile *f,
1566                             const MigrationParams *params)
1567 {
1568     SaveStateEntry *se;
1569     int ret;
1570
1571     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1572         if(se->set_params == NULL) {
1573             continue;
1574         }
1575         se->set_params(params, se->opaque);
1576     }
1577
1578     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1579     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1580
1581     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1582         int len;
1583
1584         if (se->save_live_state == NULL)
1585             continue;
1586
1587         /* Section type */
1588         qemu_put_byte(f, QEMU_VM_SECTION_START);
1589         qemu_put_be32(f, se->section_id);
1590
1591         /* ID string */
1592         len = strlen(se->idstr);
1593         qemu_put_byte(f, len);
1594         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1595
1596         qemu_put_be32(f, se->instance_id);
1597         qemu_put_be32(f, se->version_id);
1598
1599         ret = se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1600         if (ret < 0) {
1601             qemu_savevm_state_cancel(f);
1602             return ret;
1603         }
1604     }
1605     ret = qemu_file_get_error(f);
1606     if (ret != 0) {
1607         qemu_savevm_state_cancel(f);
1608     }
1609
1610     return ret;
1611
1612 }
1613
1614 /*
1615  * this function has three return values:
1616  *   negative: there was one error, and we have -errno.
1617  *   0 : We haven't finished, caller have to go again
1618  *   1 : We have finished, we can go to complete phase
1619  */
1620 int qemu_savevm_state_iterate(QEMUFile *f)
1621 {
1622     SaveStateEntry *se;
1623     int ret = 1;
1624
1625     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1626         if (se->save_live_state == NULL)
1627             continue;
1628
1629         if (qemu_file_rate_limit(f)) {
1630             return 0;
1631         }
1632         trace_savevm_section_start();
1633         /* Section type */
1634         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1635         qemu_put_be32(f, se->section_id);
1636
1637         ret = se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1638         trace_savevm_section_end(se->section_id);
1639
1640         if (ret <= 0) {
1641             /* Do not proceed to the next vmstate before this one reported
1642                completion of the current stage. This serializes the migration
1643                and reduces the probability that a faster changing state is
1644                synchronized over and over again. */
1645             break;
1646         }
1647     }
1648     if (ret != 0) {
1649         return ret;
1650     }
1651     ret = qemu_file_get_error(f);
1652     if (ret != 0) {
1653         qemu_savevm_state_cancel(f);
1654     }
1655     return ret;
1656 }
1657
1658 int qemu_savevm_state_complete(QEMUFile *f)
1659 {
1660     SaveStateEntry *se;
1661     int ret;
1662
1663     cpu_synchronize_all_states();
1664
1665     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1666         if (se->save_live_state == NULL)
1667             continue;
1668
1669         trace_savevm_section_start();
1670         /* Section type */
1671         qemu_put_byte(f, QEMU_VM_SECTION_END);
1672         qemu_put_be32(f, se->section_id);
1673
1674         ret = se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1675         trace_savevm_section_end(se->section_id);
1676         if (ret < 0) {
1677             return ret;
1678         }
1679     }
1680
1681     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1682         int len;
1683
1684         if (se->save_state == NULL && se->vmsd == NULL)
1685             continue;
1686
1687         trace_savevm_section_start();
1688         /* Section type */
1689         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1690         qemu_put_be32(f, se->section_id);
1691
1692         /* ID string */
1693         len = strlen(se->idstr);
1694         qemu_put_byte(f, len);
1695         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1696
1697         qemu_put_be32(f, se->instance_id);
1698         qemu_put_be32(f, se->version_id);
1699
1700         vmstate_save(f, se);
1701         trace_savevm_section_end(se->section_id);
1702     }
1703
1704     qemu_put_byte(f, QEMU_VM_EOF);
1705
1706     return qemu_file_get_error(f);
1707 }
1708
1709 void qemu_savevm_state_cancel(QEMUFile *f)
1710 {
1711     SaveStateEntry *se;
1712
1713     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1714         if (se->save_live_state) {
1715             se->save_live_state(f, -1, se->opaque);
1716         }
1717     }
1718 }
1719
1720 static int qemu_savevm_state(QEMUFile *f)
1721 {
1722     int ret;
1723     MigrationParams params = {
1724         .blk = 0,
1725         .shared = 0
1726     };
1727
1728     if (qemu_savevm_state_blocked(NULL)) {
1729         ret = -EINVAL;
1730         goto out;
1731     }
1732
1733     ret = qemu_savevm_state_begin(f, &params);
1734     if (ret < 0)
1735         goto out;
1736
1737     do {
1738         ret = qemu_savevm_state_iterate(f);
1739         if (ret < 0)
1740             goto out;
1741     } while (ret == 0);
1742
1743     ret = qemu_savevm_state_complete(f);
1744
1745 out:
1746     if (ret == 0) {
1747         ret = qemu_file_get_error(f);
1748     }
1749
1750     return ret;
1751 }
1752
1753 static int qemu_save_device_state(QEMUFile *f)
1754 {
1755     SaveStateEntry *se;
1756
1757     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1758     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1759
1760     cpu_synchronize_all_states();
1761
1762     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1763         int len;
1764
1765         if (se->is_ram) {
1766             continue;
1767         }
1768         if (se->save_state == NULL && se->vmsd == NULL) {
1769             continue;
1770         }
1771
1772         /* Section type */
1773         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1774         qemu_put_be32(f, se->section_id);
1775
1776         /* ID string */
1777         len = strlen(se->idstr);
1778         qemu_put_byte(f, len);
1779         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1780
1781         qemu_put_be32(f, se->instance_id);
1782         qemu_put_be32(f, se->version_id);
1783
1784         vmstate_save(f, se);
1785     }
1786
1787     qemu_put_byte(f, QEMU_VM_EOF);
1788
1789     return qemu_file_get_error(f);
1790 }
1791
1792 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1793 {
1794     SaveStateEntry *se;
1795
1796     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1797         if (!strcmp(se->idstr, idstr) &&
1798             (instance_id == se->instance_id ||
1799              instance_id == se->alias_id))
1800             return se;
1801         /* Migrating from an older version? */
1802         if (strstr(se->idstr, idstr) && se->compat) {
1803             if (!strcmp(se->compat->idstr, idstr) &&
1804                 (instance_id == se->compat->instance_id ||
1805                  instance_id == se->alias_id))
1806                 return se;
1807         }
1808     }
1809     return NULL;
1810 }
1811
1812 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1813 {
1814     while(sub && sub->needed) {
1815         if (strcmp(idstr, sub->vmsd->name) == 0) {
1816             return sub->vmsd;
1817         }
1818         sub++;
1819     }
1820     return NULL;
1821 }
1822
1823 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1824                                    void *opaque)
1825 {
1826     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1827         char idstr[256];
1828         int ret;
1829         uint8_t version_id, len, size;
1830         const VMStateDescription *sub_vmsd;
1831
1832         len = qemu_peek_byte(f, 1);
1833         if (len < strlen(vmsd->name) + 1) {
1834             /* subsection name has be be "section_name/a" */
1835             return 0;
1836         }
1837         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1838         if (size != len) {
1839             return 0;
1840         }
1841         idstr[size] = 0;
1842
1843         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1844             /* it don't have a valid subsection name */
1845             return 0;
1846         }
1847         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1848         if (sub_vmsd == NULL) {
1849             return -ENOENT;
1850         }
1851         qemu_file_skip(f, 1); /* subsection */
1852         qemu_file_skip(f, 1); /* len */
1853         qemu_file_skip(f, len); /* idstr */
1854         version_id = qemu_get_be32(f);
1855
1856         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1857         if (ret) {
1858             return ret;
1859         }
1860     }
1861     return 0;
1862 }
1863
1864 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1865                                     void *opaque)
1866 {
1867     const VMStateSubsection *sub = vmsd->subsections;
1868
1869     while (sub && sub->needed) {
1870         if (sub->needed(opaque)) {
1871             const VMStateDescription *vmsd = sub->vmsd;
1872             uint8_t len;
1873
1874             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1875             len = strlen(vmsd->name);
1876             qemu_put_byte(f, len);
1877             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1878             qemu_put_be32(f, vmsd->version_id);
1879             vmstate_save_state(f, vmsd, opaque);
1880         }
1881         sub++;
1882     }
1883 }
1884
1885 typedef struct LoadStateEntry {
1886     QLIST_ENTRY(LoadStateEntry) entry;
1887     SaveStateEntry *se;
1888     int section_id;
1889     int version_id;
1890 } LoadStateEntry;
1891
1892 int qemu_loadvm_state(QEMUFile *f)
1893 {
1894     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1895         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1896     LoadStateEntry *le, *new_le;
1897     uint8_t section_type;
1898     unsigned int v;
1899     int ret;
1900
1901     if (qemu_savevm_state_blocked(NULL)) {
1902         return -EINVAL;
1903     }
1904
1905     v = qemu_get_be32(f);
1906     if (v != QEMU_VM_FILE_MAGIC)
1907         return -EINVAL;
1908
1909     v = qemu_get_be32(f);
1910     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1911         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1912         return -ENOTSUP;
1913     }
1914     if (v != QEMU_VM_FILE_VERSION)
1915         return -ENOTSUP;
1916
1917     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1918         uint32_t instance_id, version_id, section_id;
1919         SaveStateEntry *se;
1920         char idstr[257];
1921         int len;
1922
1923         switch (section_type) {
1924         case QEMU_VM_SECTION_START:
1925         case QEMU_VM_SECTION_FULL:
1926             /* Read section start */
1927             section_id = qemu_get_be32(f);
1928             len = qemu_get_byte(f);
1929             qemu_get_buffer(f, (uint8_t *)idstr, len);
1930             idstr[len] = 0;
1931             instance_id = qemu_get_be32(f);
1932             version_id = qemu_get_be32(f);
1933
1934             /* Find savevm section */
1935             se = find_se(idstr, instance_id);
1936             if (se == NULL) {
1937                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1938                 ret = -EINVAL;
1939                 goto out;
1940             }
1941
1942             /* Validate version */
1943             if (version_id > se->version_id) {
1944                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1945                         version_id, idstr, se->version_id);
1946                 ret = -EINVAL;
1947                 goto out;
1948             }
1949
1950             /* Add entry */
1951             le = g_malloc0(sizeof(*le));
1952
1953             le->se = se;
1954             le->section_id = section_id;
1955             le->version_id = version_id;
1956             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1957
1958             ret = vmstate_load(f, le->se, le->version_id);
1959             if (ret < 0) {
1960                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1961                         instance_id, idstr);
1962                 goto out;
1963             }
1964             break;
1965         case QEMU_VM_SECTION_PART:
1966         case QEMU_VM_SECTION_END:
1967             section_id = qemu_get_be32(f);
1968
1969             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1970                 if (le->section_id == section_id) {
1971                     break;
1972                 }
1973             }
1974             if (le == NULL) {
1975                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1976                 ret = -EINVAL;
1977                 goto out;
1978             }
1979
1980             ret = vmstate_load(f, le->se, le->version_id);
1981             if (ret < 0) {
1982                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1983                         section_id);
1984                 goto out;
1985             }
1986             break;
1987         default:
1988             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1989             ret = -EINVAL;
1990             goto out;
1991         }
1992     }
1993
1994     cpu_synchronize_all_post_init();
1995
1996     ret = 0;
1997
1998 out:
1999     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2000         QLIST_REMOVE(le, entry);
2001         g_free(le);
2002     }
2003
2004     if (ret == 0) {
2005         ret = qemu_file_get_error(f);
2006     }
2007
2008     return ret;
2009 }
2010
2011 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
2012                               const char *name)
2013 {
2014     QEMUSnapshotInfo *sn_tab, *sn;
2015     int nb_sns, i, ret;
2016
2017     ret = -ENOENT;
2018     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2019     if (nb_sns < 0)
2020         return ret;
2021     for(i = 0; i < nb_sns; i++) {
2022         sn = &sn_tab[i];
2023         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2024             *sn_info = *sn;
2025             ret = 0;
2026             break;
2027         }
2028     }
2029     g_free(sn_tab);
2030     return ret;
2031 }
2032
2033 /*
2034  * Deletes snapshots of a given name in all opened images.
2035  */
2036 static int del_existing_snapshots(Monitor *mon, const char *name)
2037 {
2038     BlockDriverState *bs;
2039     QEMUSnapshotInfo sn1, *snapshot = &sn1;
2040     int ret;
2041
2042     bs = NULL;
2043     while ((bs = bdrv_next(bs))) {
2044         if (bdrv_can_snapshot(bs) &&
2045             bdrv_snapshot_find(bs, snapshot, name) >= 0)
2046         {
2047             ret = bdrv_snapshot_delete(bs, name);
2048             if (ret < 0) {
2049                 monitor_printf(mon,
2050                                "Error while deleting snapshot on '%s'\n",
2051                                bdrv_get_device_name(bs));
2052                 return -1;
2053             }
2054         }
2055     }
2056
2057     return 0;
2058 }
2059
2060 void do_savevm(Monitor *mon, const QDict *qdict)
2061 {
2062     BlockDriverState *bs, *bs1;
2063     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2064     int ret;
2065     QEMUFile *f;
2066     int saved_vm_running;
2067     uint64_t vm_state_size;
2068 #ifdef _WIN32
2069     struct _timeb tb;
2070     struct tm *ptm;
2071 #else
2072     struct timeval tv;
2073     struct tm tm;
2074 #endif
2075     const char *name = qdict_get_try_str(qdict, "name");
2076
2077     /* Verify if there is a device that doesn't support snapshots and is writable */
2078     bs = NULL;
2079     while ((bs = bdrv_next(bs))) {
2080
2081         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2082             continue;
2083         }
2084
2085         if (!bdrv_can_snapshot(bs)) {
2086             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2087                                bdrv_get_device_name(bs));
2088             return;
2089         }
2090     }
2091
2092     bs = bdrv_snapshots();
2093     if (!bs) {
2094         monitor_printf(mon, "No block device can accept snapshots\n");
2095         return;
2096     }
2097
2098     saved_vm_running = runstate_is_running();
2099     vm_stop(RUN_STATE_SAVE_VM);
2100
2101     memset(sn, 0, sizeof(*sn));
2102
2103     /* fill auxiliary fields */
2104 #ifdef _WIN32
2105     _ftime(&tb);
2106     sn->date_sec = tb.time;
2107     sn->date_nsec = tb.millitm * 1000000;
2108 #else
2109     gettimeofday(&tv, NULL);
2110     sn->date_sec = tv.tv_sec;
2111     sn->date_nsec = tv.tv_usec * 1000;
2112 #endif
2113     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2114
2115     if (name) {
2116         ret = bdrv_snapshot_find(bs, old_sn, name);
2117         if (ret >= 0) {
2118             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2119             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2120         } else {
2121             pstrcpy(sn->name, sizeof(sn->name), name);
2122         }
2123     } else {
2124 #ifdef _WIN32
2125         time_t t = tb.time;
2126         ptm = localtime(&t);
2127         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2128 #else
2129         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2130         localtime_r((const time_t *)&tv.tv_sec, &tm);
2131         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2132 #endif
2133     }
2134
2135     /* Delete old snapshots of the same name */
2136     if (name && del_existing_snapshots(mon, name) < 0) {
2137         goto the_end;
2138     }
2139
2140     /* save the VM state */
2141     f = qemu_fopen_bdrv(bs, 1);
2142     if (!f) {
2143         monitor_printf(mon, "Could not open VM state file\n");
2144         goto the_end;
2145     }
2146     ret = qemu_savevm_state(f);
2147     vm_state_size = qemu_ftell(f);
2148     qemu_fclose(f);
2149     if (ret < 0) {
2150         monitor_printf(mon, "Error %d while writing VM\n", ret);
2151         goto the_end;
2152     }
2153
2154     /* create the snapshots */
2155
2156     bs1 = NULL;
2157     while ((bs1 = bdrv_next(bs1))) {
2158         if (bdrv_can_snapshot(bs1)) {
2159             /* Write VM state size only to the image that contains the state */
2160             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2161             ret = bdrv_snapshot_create(bs1, sn);
2162             if (ret < 0) {
2163                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2164                                bdrv_get_device_name(bs1));
2165             }
2166         }
2167     }
2168
2169  the_end:
2170     if (saved_vm_running)
2171         vm_start();
2172 }
2173
2174 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2175 {
2176     QEMUFile *f;
2177     int saved_vm_running;
2178     int ret;
2179
2180     saved_vm_running = runstate_is_running();
2181     vm_stop(RUN_STATE_SAVE_VM);
2182
2183     f = qemu_fopen(filename, "wb");
2184     if (!f) {
2185         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2186         goto the_end;
2187     }
2188     ret = qemu_save_device_state(f);
2189     qemu_fclose(f);
2190     if (ret < 0) {
2191         error_set(errp, QERR_IO_ERROR);
2192     }
2193
2194  the_end:
2195     if (saved_vm_running)
2196         vm_start();
2197     return;
2198 }
2199
2200 int load_vmstate(const char *name)
2201 {
2202     BlockDriverState *bs, *bs_vm_state;
2203     QEMUSnapshotInfo sn;
2204     QEMUFile *f;
2205     int ret;
2206
2207     bs_vm_state = bdrv_snapshots();
2208     if (!bs_vm_state) {
2209         error_report("No block device supports snapshots");
2210         return -ENOTSUP;
2211     }
2212
2213     /* Don't even try to load empty VM states */
2214     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2215     if (ret < 0) {
2216         return ret;
2217     } else if (sn.vm_state_size == 0) {
2218         error_report("This is a disk-only snapshot. Revert to it offline "
2219             "using qemu-img.");
2220         return -EINVAL;
2221     }
2222
2223     /* Verify if there is any device that doesn't support snapshots and is
2224     writable and check if the requested snapshot is available too. */
2225     bs = NULL;
2226     while ((bs = bdrv_next(bs))) {
2227
2228         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2229             continue;
2230         }
2231
2232         if (!bdrv_can_snapshot(bs)) {
2233             error_report("Device '%s' is writable but does not support snapshots.",
2234                                bdrv_get_device_name(bs));
2235             return -ENOTSUP;
2236         }
2237
2238         ret = bdrv_snapshot_find(bs, &sn, name);
2239         if (ret < 0) {
2240             error_report("Device '%s' does not have the requested snapshot '%s'",
2241                            bdrv_get_device_name(bs), name);
2242             return ret;
2243         }
2244     }
2245
2246     /* Flush all IO requests so they don't interfere with the new state.  */
2247     bdrv_drain_all();
2248
2249     bs = NULL;
2250     while ((bs = bdrv_next(bs))) {
2251         if (bdrv_can_snapshot(bs)) {
2252             ret = bdrv_snapshot_goto(bs, name);
2253             if (ret < 0) {
2254                 error_report("Error %d while activating snapshot '%s' on '%s'",
2255                              ret, name, bdrv_get_device_name(bs));
2256                 return ret;
2257             }
2258         }
2259     }
2260
2261     /* restore the VM state */
2262     f = qemu_fopen_bdrv(bs_vm_state, 0);
2263     if (!f) {
2264         error_report("Could not open VM state file");
2265         return -EINVAL;
2266     }
2267
2268     qemu_system_reset(VMRESET_SILENT);
2269     ret = qemu_loadvm_state(f);
2270
2271     qemu_fclose(f);
2272     if (ret < 0) {
2273         error_report("Error %d while loading VM state", ret);
2274         return ret;
2275     }
2276
2277     return 0;
2278 }
2279
2280 void do_delvm(Monitor *mon, const QDict *qdict)
2281 {
2282     BlockDriverState *bs, *bs1;
2283     int ret;
2284     const char *name = qdict_get_str(qdict, "name");
2285
2286     bs = bdrv_snapshots();
2287     if (!bs) {
2288         monitor_printf(mon, "No block device supports snapshots\n");
2289         return;
2290     }
2291
2292     bs1 = NULL;
2293     while ((bs1 = bdrv_next(bs1))) {
2294         if (bdrv_can_snapshot(bs1)) {
2295             ret = bdrv_snapshot_delete(bs1, name);
2296             if (ret < 0) {
2297                 if (ret == -ENOTSUP)
2298                     monitor_printf(mon,
2299                                    "Snapshots not supported on device '%s'\n",
2300                                    bdrv_get_device_name(bs1));
2301                 else
2302                     monitor_printf(mon, "Error %d while deleting snapshot on "
2303                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2304             }
2305         }
2306     }
2307 }
2308
2309 void do_info_snapshots(Monitor *mon)
2310 {
2311     BlockDriverState *bs, *bs1;
2312     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2313     int nb_sns, i, ret, available;
2314     int total;
2315     int *available_snapshots;
2316     char buf[256];
2317
2318     bs = bdrv_snapshots();
2319     if (!bs) {
2320         monitor_printf(mon, "No available block device supports snapshots\n");
2321         return;
2322     }
2323
2324     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2325     if (nb_sns < 0) {
2326         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2327         return;
2328     }
2329
2330     if (nb_sns == 0) {
2331         monitor_printf(mon, "There is no snapshot available.\n");
2332         return;
2333     }
2334
2335     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2336     total = 0;
2337     for (i = 0; i < nb_sns; i++) {
2338         sn = &sn_tab[i];
2339         available = 1;
2340         bs1 = NULL;
2341
2342         while ((bs1 = bdrv_next(bs1))) {
2343             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2344                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2345                 if (ret < 0) {
2346                     available = 0;
2347                     break;
2348                 }
2349             }
2350         }
2351
2352         if (available) {
2353             available_snapshots[total] = i;
2354             total++;
2355         }
2356     }
2357
2358     if (total > 0) {
2359         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2360         for (i = 0; i < total; i++) {
2361             sn = &sn_tab[available_snapshots[i]];
2362             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2363         }
2364     } else {
2365         monitor_printf(mon, "There is no suitable snapshot available\n");
2366     }
2367
2368     g_free(sn_tab);
2369     g_free(available_snapshots);
2370
2371 }
2372
2373 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2374 {
2375     qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2376                        memory_region_name(mr), dev);
2377 }
2378
2379 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2380 {
2381     /* Nothing do to while the implementation is in RAMBlock */
2382 }
2383
2384 void vmstate_register_ram_global(MemoryRegion *mr)
2385 {
2386     vmstate_register_ram(mr, NULL);
2387 }