savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #include <arpa/inet.h>
  46 #include <dirent.h>
  47 #include <netdb.h>
  48 #include <sys/select.h>
  49 #ifdef CONFIG_BSD
  50 #include <sys/stat.h>
  51 #if defined(__FreeBSD__) || defined(__DragonFly__)
  52 #include <libutil.h>
  53 #else
  54 #include <util.h>
  55 #endif
  56 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  57 #include <freebsd/stdlib.h>
  58 #else
  59 #ifdef __linux__
  60 #include <pty.h>
  61 #include <malloc.h>
  62 #include <linux/rtc.h>
  63 #endif
  64 #endif
  65 #endif
  66
  67 #ifdef _WIN32
  68 #include <windows.h>
  69 #include <malloc.h>
  70 #include <sys/timeb.h>
  71 #include <mmsystem.h>
  72 #define getopt_long_only getopt_long
  73 #define memalign(align, size) malloc(size)
  74 #endif
  75
  76 #include "qemu-common.h"
  77 #include "hw/hw.h"
  78 #include "net.h"
  79 #include "monitor.h"
  80 #include "sysemu.h"
  81 #include "qemu-timer.h"
  82 #include "qemu-char.h"
  83 #include "block.h"
  84 #include "audio/audio.h"
  85 #include "migration.h"
  86 #include "qemu_socket.h"
  87 #include "qemu-queue.h"
  88
  89 /* point to the block driver where the snapshots are managed */
  90 static BlockDriverState *bs_snapshots;
  91
  92 #define SELF_ANNOUNCE_ROUNDS 5
  93
  94 #ifndef ETH_P_RARP
  95 #define ETH_P_RARP 0x0835
  96 #endif
  97 #define ARP_HTYPE_ETH 0x0001
  98 #define ARP_PTYPE_IP 0x0800
  99 #define ARP_OP_REQUEST_REV 0x3
 100
 101 static int announce_self_create(uint8_t *buf,
 102                                 uint8_t *mac_addr)
 103 {
 104     /* Ethernet header. */
 105     memset(buf, 0xff, 6);         /* destination MAC addr */
 106     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 107     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 108
 109     /* RARP header. */
 110     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 111     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 112     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 113     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 114     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 115     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 116     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 117     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 118     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 119
 120     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 121     memset(buf + 42, 0x00, 18);
 122
 123     return 60; /* len (FCS will be added by hardware) */
 124 }
 125
 126 static void qemu_announce_self_once(void *opaque)
 127 {
 128     int i, len;
 129     VLANState *vlan;
 130     VLANClientState *vc;
 131     uint8_t buf[60];
 132     static int count = SELF_ANNOUNCE_ROUNDS;
 133     QEMUTimer *timer = *(QEMUTimer **)opaque;
 134
 135     for (i = 0; i < MAX_NICS; i++) {
 136         if (!nd_table[i].used)
 137             continue;
 138         len = announce_self_create(buf, nd_table[i].macaddr);
 139         vlan = nd_table[i].vlan;
 140         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 141             qemu_send_packet_raw(vc, buf, len);
 142         }
 143     }
 144     if (--count) {
 145         /* delay 50ms, 150ms, 250ms, ... */
 146         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 147                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 148     } else {
 149             qemu_del_timer(timer);
 150             qemu_free_timer(timer);
 151     }
 152 }
 153
 154 void qemu_announce_self(void)
 155 {
 156         static QEMUTimer *timer;
 157         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 158         qemu_announce_self_once(&timer);
 159 }
 160
 161 /***********************************************************/
 162 /* savevm/loadvm support */
 163
 164 #define IO_BUF_SIZE 32768
 165
 166 struct QEMUFile {
 167     QEMUFilePutBufferFunc *put_buffer;
 168     QEMUFileGetBufferFunc *get_buffer;
 169     QEMUFileCloseFunc *close;
 170     QEMUFileRateLimit *rate_limit;
 171     QEMUFileSetRateLimit *set_rate_limit;
 172     QEMUFileGetRateLimit *get_rate_limit;
 173     void *opaque;
 174     int is_write;
 175
 176     int64_t buf_offset; /* start of buffer when writing, end of buffer
 177                            when reading */
 178     int buf_index;
 179     int buf_size; /* 0 when writing */
 180     uint8_t buf[IO_BUF_SIZE];
 181
 182     int has_error;
 183 };
 184
 185 typedef struct QEMUFileStdio
 186 {
 187     FILE *stdio_file;
 188     QEMUFile *file;
 189 } QEMUFileStdio;
 190
 191 typedef struct QEMUFileSocket
 192 {
 193     int fd;
 194     QEMUFile *file;
 195 } QEMUFileSocket;
 196
 197 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 198 {
 199     QEMUFileSocket *s = opaque;
 200     ssize_t len;
 201
 202     do {
 203         len = recv(s->fd, (void *)buf, size, 0);
 204     } while (len == -1 && socket_error() == EINTR);
 205
 206     if (len == -1)
 207         len = -socket_error();
 208
 209     return len;
 210 }
 211
 212 static int socket_close(void *opaque)
 213 {
 214     QEMUFileSocket *s = opaque;
 215     qemu_free(s);
 216     return 0;
 217 }
 218
 219 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 220 {
 221     QEMUFileStdio *s = opaque;
 222     return fwrite(buf, 1, size, s->stdio_file);
 223 }
 224
 225 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 226 {
 227     QEMUFileStdio *s = opaque;
 228     FILE *fp = s->stdio_file;
 229     int bytes;
 230
 231     do {
 232         clearerr(fp);
 233         bytes = fread(buf, 1, size, fp);
 234     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 235     return bytes;
 236 }
 237
 238 static int stdio_pclose(void *opaque)
 239 {
 240     QEMUFileStdio *s = opaque;
 241     pclose(s->stdio_file);
 242     qemu_free(s);
 243     return 0;
 244 }
 245
 246 static int stdio_fclose(void *opaque)
 247 {
 248     QEMUFileStdio *s = opaque;
 249     fclose(s->stdio_file);
 250     qemu_free(s);
 251     return 0;
 252 }
 253
 254 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 255 {
 256     QEMUFileStdio *s;
 257
 258     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 259         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 260         return NULL;
 261     }
 262
 263     s = qemu_mallocz(sizeof(QEMUFileStdio));
 264
 265     s->stdio_file = stdio_file;
 266
 267     if(mode[0] == 'r') {
 268         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 269                                  NULL, NULL, NULL);
 270     } else {
 271         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 272                                  NULL, NULL, NULL);
 273     }
 274     return s->file;
 275 }
 276
 277 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 278 {
 279     FILE *popen_file;
 280
 281     popen_file = popen(command, mode);
 282     if(popen_file == NULL) {
 283         return NULL;
 284     }
 285
 286     return qemu_popen(popen_file, mode);
 287 }
 288
 289 int qemu_stdio_fd(QEMUFile *f)
 290 {
 291     QEMUFileStdio *p;
 292     int fd;
 293
 294     p = (QEMUFileStdio *)f->opaque;
 295     fd = fileno(p->stdio_file);
 296
 297     return fd;
 298 }
 299
 300 QEMUFile *qemu_fdopen(int fd, const char *mode)
 301 {
 302     QEMUFileStdio *s;
 303
 304     if (mode == NULL ||
 305         (mode[0] != 'r' && mode[0] != 'w') ||
 306         mode[1] != 'b' || mode[2] != 0) {
 307         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 308         return NULL;
 309     }
 310
 311     s = qemu_mallocz(sizeof(QEMUFileStdio));
 312     s->stdio_file = fdopen(fd, mode);
 313     if (!s->stdio_file)
 314         goto fail;
 315
 316     if(mode[0] == 'r') {
 317         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 318                                  NULL, NULL, NULL);
 319     } else {
 320         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 321                                  NULL, NULL, NULL);
 322     }
 323     return s->file;
 324
 325 fail:
 326     qemu_free(s);
 327     return NULL;
 328 }
 329
 330 QEMUFile *qemu_fopen_socket(int fd)
 331 {
 332     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 333
 334     s->fd = fd;
 335     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 336                              NULL, NULL, NULL);
 337     return s->file;
 338 }
 339
 340 static int file_put_buffer(void *opaque, const uint8_t *buf,
 341                             int64_t pos, int size)
 342 {
 343     QEMUFileStdio *s = opaque;
 344     fseek(s->stdio_file, pos, SEEK_SET);
 345     fwrite(buf, 1, size, s->stdio_file);
 346     return size;
 347 }
 348
 349 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 350 {
 351     QEMUFileStdio *s = opaque;
 352     fseek(s->stdio_file, pos, SEEK_SET);
 353     return fread(buf, 1, size, s->stdio_file);
 354 }
 355
 356 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 357 {
 358     QEMUFileStdio *s;
 359
 360     if (mode == NULL ||
 361         (mode[0] != 'r' && mode[0] != 'w') ||
 362         mode[1] != 'b' || mode[2] != 0) {
 363         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 364         return NULL;
 365     }
 366
 367     s = qemu_mallocz(sizeof(QEMUFileStdio));
 368
 369     s->stdio_file = fopen(filename, mode);
 370     if (!s->stdio_file)
 371         goto fail;
 372
 373     if(mode[0] == 'w') {
 374         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 375                                  NULL, NULL, NULL);
 376     } else {
 377         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 378                                NULL, NULL, NULL);
 379     }
 380     return s->file;
 381 fail:
 382     qemu_free(s);
 383     return NULL;
 384 }
 385
 386 static int block_put_buffer(void *opaque, const uint8_t *buf,
 387                            int64_t pos, int size)
 388 {
 389     bdrv_save_vmstate(opaque, buf, pos, size);
 390     return size;
 391 }
 392
 393 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 394 {
 395     return bdrv_load_vmstate(opaque, buf, pos, size);
 396 }
 397
 398 static int bdrv_fclose(void *opaque)
 399 {
 400     return 0;
 401 }
 402
 403 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 404 {
 405     if (is_writable)
 406         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 407                               NULL, NULL, NULL);
 408     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 409 }
 410
 411 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 412                          QEMUFileGetBufferFunc *get_buffer,
 413                          QEMUFileCloseFunc *close,
 414                          QEMUFileRateLimit *rate_limit,
 415                          QEMUFileSetRateLimit *set_rate_limit,
 416                          QEMUFileGetRateLimit *get_rate_limit)
 417 {
 418     QEMUFile *f;
 419
 420     f = qemu_mallocz(sizeof(QEMUFile));
 421
 422     f->opaque = opaque;
 423     f->put_buffer = put_buffer;
 424     f->get_buffer = get_buffer;
 425     f->close = close;
 426     f->rate_limit = rate_limit;
 427     f->set_rate_limit = set_rate_limit;
 428     f->get_rate_limit = get_rate_limit;
 429     f->is_write = 0;
 430
 431     return f;
 432 }
 433
 434 int qemu_file_has_error(QEMUFile *f)
 435 {
 436     return f->has_error;
 437 }
 438
 439 void qemu_file_set_error(QEMUFile *f)
 440 {
 441     f->has_error = 1;
 442 }
 443
 444 void qemu_fflush(QEMUFile *f)
 445 {
 446     if (!f->put_buffer)
 447         return;
 448
 449     if (f->is_write && f->buf_index > 0) {
 450         int len;
 451
 452         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 453         if (len > 0)
 454             f->buf_offset += f->buf_index;
 455         else
 456             f->has_error = 1;
 457         f->buf_index = 0;
 458     }
 459 }
 460
 461 static void qemu_fill_buffer(QEMUFile *f)
 462 {
 463     int len;
 464
 465     if (!f->get_buffer)
 466         return;
 467
 468     if (f->is_write)
 469         abort();
 470
 471     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 472     if (len > 0) {
 473         f->buf_index = 0;
 474         f->buf_size = len;
 475         f->buf_offset += len;
 476     } else if (len != -EAGAIN)
 477         f->has_error = 1;
 478 }
 479
 480 int qemu_fclose(QEMUFile *f)
 481 {
 482     int ret = 0;
 483     qemu_fflush(f);
 484     if (f->close)
 485         ret = f->close(f->opaque);
 486     qemu_free(f);
 487     return ret;
 488 }
 489
 490 void qemu_file_put_notify(QEMUFile *f)
 491 {
 492     f->put_buffer(f->opaque, NULL, 0, 0);
 493 }
 494
 495 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 496 {
 497     int l;
 498
 499     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 500         fprintf(stderr,
 501                 "Attempted to write to buffer while read buffer is not empty\n");
 502         abort();
 503     }
 504
 505     while (!f->has_error && size > 0) {
 506         l = IO_BUF_SIZE - f->buf_index;
 507         if (l > size)
 508             l = size;
 509         memcpy(f->buf + f->buf_index, buf, l);
 510         f->is_write = 1;
 511         f->buf_index += l;
 512         buf += l;
 513         size -= l;
 514         if (f->buf_index >= IO_BUF_SIZE)
 515             qemu_fflush(f);
 516     }
 517 }
 518
 519 void qemu_put_byte(QEMUFile *f, int v)
 520 {
 521     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 522         fprintf(stderr,
 523                 "Attempted to write to buffer while read buffer is not empty\n");
 524         abort();
 525     }
 526
 527     f->buf[f->buf_index++] = v;
 528     f->is_write = 1;
 529     if (f->buf_index >= IO_BUF_SIZE)
 530         qemu_fflush(f);
 531 }
 532
 533 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 534 {
 535     int size, l;
 536
 537     if (f->is_write)
 538         abort();
 539
 540     size = size1;
 541     while (size > 0) {
 542         l = f->buf_size - f->buf_index;
 543         if (l == 0) {
 544             qemu_fill_buffer(f);
 545             l = f->buf_size - f->buf_index;
 546             if (l == 0)
 547                 break;
 548         }
 549         if (l > size)
 550             l = size;
 551         memcpy(buf, f->buf + f->buf_index, l);
 552         f->buf_index += l;
 553         buf += l;
 554         size -= l;
 555     }
 556     return size1 - size;
 557 }
 558
 559 int qemu_get_byte(QEMUFile *f)
 560 {
 561     if (f->is_write)
 562         abort();
 563
 564     if (f->buf_index >= f->buf_size) {
 565         qemu_fill_buffer(f);
 566         if (f->buf_index >= f->buf_size)
 567             return 0;
 568     }
 569     return f->buf[f->buf_index++];
 570 }
 571
 572 int64_t qemu_ftell(QEMUFile *f)
 573 {
 574     return f->buf_offset - f->buf_size + f->buf_index;
 575 }
 576
 577 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 578 {
 579     if (whence == SEEK_SET) {
 580         /* nothing to do */
 581     } else if (whence == SEEK_CUR) {
 582         pos += qemu_ftell(f);
 583     } else {
 584         /* SEEK_END not supported */
 585         return -1;
 586     }
 587     if (f->put_buffer) {
 588         qemu_fflush(f);
 589         f->buf_offset = pos;
 590     } else {
 591         f->buf_offset = pos;
 592         f->buf_index = 0;
 593         f->buf_size = 0;
 594     }
 595     return pos;
 596 }
 597
 598 int qemu_file_rate_limit(QEMUFile *f)
 599 {
 600     if (f->rate_limit)
 601         return f->rate_limit(f->opaque);
 602
 603     return 0;
 604 }
 605
 606 size_t qemu_file_get_rate_limit(QEMUFile *f)
 607 {
 608     if (f->get_rate_limit)
 609         return f->get_rate_limit(f->opaque);
 610
 611     return 0;
 612 }
 613
 614 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 615 {
 616     /* any failed or completed migration keeps its state to allow probing of
 617      * migration data, but has no associated file anymore */
 618     if (f && f->set_rate_limit)
 619         return f->set_rate_limit(f->opaque, new_rate);
 620
 621     return 0;
 622 }
 623
 624 void qemu_put_be16(QEMUFile *f, unsigned int v)
 625 {
 626     qemu_put_byte(f, v >> 8);
 627     qemu_put_byte(f, v);
 628 }
 629
 630 void qemu_put_be32(QEMUFile *f, unsigned int v)
 631 {
 632     qemu_put_byte(f, v >> 24);
 633     qemu_put_byte(f, v >> 16);
 634     qemu_put_byte(f, v >> 8);
 635     qemu_put_byte(f, v);
 636 }
 637
 638 void qemu_put_be64(QEMUFile *f, uint64_t v)
 639 {
 640     qemu_put_be32(f, v >> 32);
 641     qemu_put_be32(f, v);
 642 }
 643
 644 unsigned int qemu_get_be16(QEMUFile *f)
 645 {
 646     unsigned int v;
 647     v = qemu_get_byte(f) << 8;
 648     v |= qemu_get_byte(f);
 649     return v;
 650 }
 651
 652 unsigned int qemu_get_be32(QEMUFile *f)
 653 {
 654     unsigned int v;
 655     v = qemu_get_byte(f) << 24;
 656     v |= qemu_get_byte(f) << 16;
 657     v |= qemu_get_byte(f) << 8;
 658     v |= qemu_get_byte(f);
 659     return v;
 660 }
 661
 662 uint64_t qemu_get_be64(QEMUFile *f)
 663 {
 664     uint64_t v;
 665     v = (uint64_t)qemu_get_be32(f) << 32;
 666     v |= qemu_get_be32(f);
 667     return v;
 668 }
 669
 670 /* 8 bit int */
 671
 672 static int get_int8(QEMUFile *f, void *pv, size_t size)
 673 {
 674     int8_t *v = pv;
 675     qemu_get_s8s(f, v);
 676     return 0;
 677 }
 678
 679 static void put_int8(QEMUFile *f, void *pv, size_t size)
 680 {
 681     int8_t *v = pv;
 682     qemu_put_s8s(f, v);
 683 }
 684
 685 const VMStateInfo vmstate_info_int8 = {
 686     .name = "int8",
 687     .get  = get_int8,
 688     .put  = put_int8,
 689 };
 690
 691 /* 16 bit int */
 692
 693 static int get_int16(QEMUFile *f, void *pv, size_t size)
 694 {
 695     int16_t *v = pv;
 696     qemu_get_sbe16s(f, v);
 697     return 0;
 698 }
 699
 700 static void put_int16(QEMUFile *f, void *pv, size_t size)
 701 {
 702     int16_t *v = pv;
 703     qemu_put_sbe16s(f, v);
 704 }
 705
 706 const VMStateInfo vmstate_info_int16 = {
 707     .name = "int16",
 708     .get  = get_int16,
 709     .put  = put_int16,
 710 };
 711
 712 /* 32 bit int */
 713
 714 static int get_int32(QEMUFile *f, void *pv, size_t size)
 715 {
 716     int32_t *v = pv;
 717     qemu_get_sbe32s(f, v);
 718     return 0;
 719 }
 720
 721 static void put_int32(QEMUFile *f, void *pv, size_t size)
 722 {
 723     int32_t *v = pv;
 724     qemu_put_sbe32s(f, v);
 725 }
 726
 727 const VMStateInfo vmstate_info_int32 = {
 728     .name = "int32",
 729     .get  = get_int32,
 730     .put  = put_int32,
 731 };
 732
 733 /* 32 bit int. See that the received value is the same than the one
 734    in the field */
 735
 736 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 737 {
 738     int32_t *v = pv;
 739     int32_t v2;
 740     qemu_get_sbe32s(f, &v2);
 741
 742     if (*v == v2)
 743         return 0;
 744     return -EINVAL;
 745 }
 746
 747 const VMStateInfo vmstate_info_int32_equal = {
 748     .name = "int32 equal",
 749     .get  = get_int32_equal,
 750     .put  = put_int32,
 751 };
 752
 753 /* 32 bit int. See that the received value is the less or the same
 754    than the one in the field */
 755
 756 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 757 {
 758     int32_t *old = pv;
 759     int32_t new;
 760     qemu_get_sbe32s(f, &new);
 761
 762     if (*old <= new)
 763         return 0;
 764     return -EINVAL;
 765 }
 766
 767 const VMStateInfo vmstate_info_int32_le = {
 768     .name = "int32 equal",
 769     .get  = get_int32_le,
 770     .put  = put_int32,
 771 };
 772
 773 /* 64 bit int */
 774
 775 static int get_int64(QEMUFile *f, void *pv, size_t size)
 776 {
 777     int64_t *v = pv;
 778     qemu_get_sbe64s(f, v);
 779     return 0;
 780 }
 781
 782 static void put_int64(QEMUFile *f, void *pv, size_t size)
 783 {
 784     int64_t *v = pv;
 785     qemu_put_sbe64s(f, v);
 786 }
 787
 788 const VMStateInfo vmstate_info_int64 = {
 789     .name = "int64",
 790     .get  = get_int64,
 791     .put  = put_int64,
 792 };
 793
 794 /* 8 bit unsigned int */
 795
 796 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 797 {
 798     uint8_t *v = pv;
 799     qemu_get_8s(f, v);
 800     return 0;
 801 }
 802
 803 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 804 {
 805     uint8_t *v = pv;
 806     qemu_put_8s(f, v);
 807 }
 808
 809 const VMStateInfo vmstate_info_uint8 = {
 810     .name = "uint8",
 811     .get  = get_uint8,
 812     .put  = put_uint8,
 813 };
 814
 815 /* 16 bit unsigned int */
 816
 817 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 818 {
 819     uint16_t *v = pv;
 820     qemu_get_be16s(f, v);
 821     return 0;
 822 }
 823
 824 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 825 {
 826     uint16_t *v = pv;
 827     qemu_put_be16s(f, v);
 828 }
 829
 830 const VMStateInfo vmstate_info_uint16 = {
 831     .name = "uint16",
 832     .get  = get_uint16,
 833     .put  = put_uint16,
 834 };
 835
 836 /* 32 bit unsigned int */
 837
 838 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 839 {
 840     uint32_t *v = pv;
 841     qemu_get_be32s(f, v);
 842     return 0;
 843 }
 844
 845 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 846 {
 847     uint32_t *v = pv;
 848     qemu_put_be32s(f, v);
 849 }
 850
 851 const VMStateInfo vmstate_info_uint32 = {
 852     .name = "uint32",
 853     .get  = get_uint32,
 854     .put  = put_uint32,
 855 };
 856
 857 /* 64 bit unsigned int */
 858
 859 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 860 {
 861     uint64_t *v = pv;
 862     qemu_get_be64s(f, v);
 863     return 0;
 864 }
 865
 866 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 867 {
 868     uint64_t *v = pv;
 869     qemu_put_be64s(f, v);
 870 }
 871
 872 const VMStateInfo vmstate_info_uint64 = {
 873     .name = "uint64",
 874     .get  = get_uint64,
 875     .put  = put_uint64,
 876 };
 877
 878 /* 8 bit int. See that the received value is the same than the one
 879    in the field */
 880
 881 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 882 {
 883     uint8_t *v = pv;
 884     uint8_t v2;
 885     qemu_get_8s(f, &v2);
 886
 887     if (*v == v2)
 888         return 0;
 889     return -EINVAL;
 890 }
 891
 892 const VMStateInfo vmstate_info_uint8_equal = {
 893     .name = "uint8 equal",
 894     .get  = get_uint8_equal,
 895     .put  = put_uint8,
 896 };
 897
 898 /* 16 bit unsigned int int. See that the received value is the same than the one
 899    in the field */
 900
 901 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 902 {
 903     uint16_t *v = pv;
 904     uint16_t v2;
 905     qemu_get_be16s(f, &v2);
 906
 907     if (*v == v2)
 908         return 0;
 909     return -EINVAL;
 910 }
 911
 912 const VMStateInfo vmstate_info_uint16_equal = {
 913     .name = "uint16 equal",
 914     .get  = get_uint16_equal,
 915     .put  = put_uint16,
 916 };
 917
 918 /* timers  */
 919
 920 static int get_timer(QEMUFile *f, void *pv, size_t size)
 921 {
 922     QEMUTimer *v = pv;
 923     qemu_get_timer(f, v);
 924     return 0;
 925 }
 926
 927 static void put_timer(QEMUFile *f, void *pv, size_t size)
 928 {
 929     QEMUTimer *v = pv;
 930     qemu_put_timer(f, v);
 931 }
 932
 933 const VMStateInfo vmstate_info_timer = {
 934     .name = "timer",
 935     .get  = get_timer,
 936     .put  = put_timer,
 937 };
 938
 939 /* uint8_t buffers */
 940
 941 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 942 {
 943     uint8_t *v = pv;
 944     qemu_get_buffer(f, v, size);
 945     return 0;
 946 }
 947
 948 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 949 {
 950     uint8_t *v = pv;
 951     qemu_put_buffer(f, v, size);
 952 }
 953
 954 const VMStateInfo vmstate_info_buffer = {
 955     .name = "buffer",
 956     .get  = get_buffer,
 957     .put  = put_buffer,
 958 };
 959
 960 /* unused buffers: space that was used for some fields that are
 961    not usefull anymore */
 962
 963 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 964 {
 965     qemu_fseek(f, size, SEEK_CUR);
 966     return 0;
 967 }
 968
 969 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 970 {
 971     qemu_fseek(f, size, SEEK_CUR);
 972 }
 973
 974 const VMStateInfo vmstate_info_unused_buffer = {
 975     .name = "unused_buffer",
 976     .get  = get_unused_buffer,
 977     .put  = put_unused_buffer,
 978 };
 979
 980 typedef struct SaveStateEntry {
 981     QTAILQ_ENTRY(SaveStateEntry) entry;
 982     char idstr[256];
 983     int instance_id;
 984     int version_id;
 985     int section_id;
 986     SaveSetParamsHandler *set_params;
 987     SaveLiveStateHandler *save_live_state;
 988     SaveStateHandler *save_state;
 989     LoadStateHandler *load_state;
 990     const VMStateDescription *vmsd;
 991     void *opaque;
 992 } SaveStateEntry;
 993
 994
 995 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
 996     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
 997 static int global_section_id;
 998
 999 static int calculate_new_instance_id(const char *idstr)
1000 {
1001     SaveStateEntry *se;
1002     int instance_id = 0;
1003
1004     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1005         if (strcmp(idstr, se->idstr) == 0
1006             && instance_id <= se->instance_id) {
1007             instance_id = se->instance_id + 1;
1008         }
1009     }
1010     return instance_id;
1011 }
1012
1013 /* TODO: Individual devices generally have very little idea about the rest
1014    of the system, so instance_id should be removed/replaced.
1015    Meanwhile pass -1 as instance_id if you do not already have a clearly
1016    distinguishing id for all instances of your device class. */
1017 int register_savevm_live(const char *idstr,
1018                          int instance_id,
1019                          int version_id,
1020                          SaveSetParamsHandler *set_params,
1021                          SaveLiveStateHandler *save_live_state,
1022                          SaveStateHandler *save_state,
1023                          LoadStateHandler *load_state,
1024                          void *opaque)
1025 {
1026     SaveStateEntry *se;
1027
1028     se = qemu_mallocz(sizeof(SaveStateEntry));
1029     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1030     se->version_id = version_id;
1031     se->section_id = global_section_id++;
1032     se->set_params = set_params;
1033     se->save_live_state = save_live_state;
1034     se->save_state = save_state;
1035     se->load_state = load_state;
1036     se->opaque = opaque;
1037     se->vmsd = NULL;
1038
1039     if (instance_id == -1) {
1040         se->instance_id = calculate_new_instance_id(idstr);
1041     } else {
1042         se->instance_id = instance_id;
1043     }
1044     /* add at the end of list */
1045     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1046     return 0;
1047 }
1048
1049 int register_savevm(const char *idstr,
1050                     int instance_id,
1051                     int version_id,
1052                     SaveStateHandler *save_state,
1053                     LoadStateHandler *load_state,
1054                     void *opaque)
1055 {
1056     return register_savevm_live(idstr, instance_id, version_id,
1057                                 NULL, NULL, save_state, load_state, opaque);
1058 }
1059
1060 void unregister_savevm(const char *idstr, void *opaque)
1061 {
1062     SaveStateEntry *se, *new_se;
1063
1064     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1065         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1066             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1067             qemu_free(se);
1068         }
1069     }
1070 }
1071
1072 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1073                      void *opaque)
1074 {
1075     SaveStateEntry *se;
1076
1077     se = qemu_mallocz(sizeof(SaveStateEntry));
1078     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1079     se->version_id = vmsd->version_id;
1080     se->section_id = global_section_id++;
1081     se->save_live_state = NULL;
1082     se->save_state = NULL;
1083     se->load_state = NULL;
1084     se->opaque = opaque;
1085     se->vmsd = vmsd;
1086
1087     if (instance_id == -1) {
1088         se->instance_id = calculate_new_instance_id(vmsd->name);
1089     } else {
1090         se->instance_id = instance_id;
1091     }
1092     /* add at the end of list */
1093     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1094     return 0;
1095 }
1096
1097 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1098 {
1099     SaveStateEntry *se, *new_se;
1100
1101     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1102         if (se->vmsd == vmsd && se->opaque == opaque) {
1103             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1104             qemu_free(se);
1105         }
1106     }
1107 }
1108
1109 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1110                        void *opaque, int version_id)
1111 {
1112     VMStateField *field = vmsd->fields;
1113
1114     if (version_id > vmsd->version_id) {
1115         return -EINVAL;
1116     }
1117     if (version_id < vmsd->minimum_version_id_old) {
1118         return -EINVAL;
1119     }
1120     if  (version_id < vmsd->minimum_version_id) {
1121         return vmsd->load_state_old(f, opaque, version_id);
1122     }
1123     if (vmsd->pre_load) {
1124         int ret = vmsd->pre_load(opaque);
1125         if (ret)
1126             return ret;
1127     }
1128     while(field->name) {
1129         if ((field->field_exists &&
1130              field->field_exists(opaque, version_id)) ||
1131             (!field->field_exists &&
1132              field->version_id <= version_id)) {
1133             void *base_addr = opaque + field->offset;
1134             int ret, i, n_elems = 1;
1135
1136             if (field->flags & VMS_ARRAY) {
1137                 n_elems = field->num;
1138             } else if (field->flags & VMS_VARRAY_INT32) {
1139                 n_elems = *(int32_t *)(opaque+field->num_offset);
1140             } else if (field->flags & VMS_VARRAY_UINT16) {
1141                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1142             }
1143             if (field->flags & VMS_POINTER) {
1144                 base_addr = *(void **)base_addr;
1145             }
1146             for (i = 0; i < n_elems; i++) {
1147                 void *addr = base_addr + field->size * i;
1148
1149                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1150                     addr = *(void **)addr;
1151                 }
1152                 if (field->flags & VMS_STRUCT) {
1153                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1154                 } else {
1155                     ret = field->info->get(f, addr, field->size);
1156
1157                 }
1158                 if (ret < 0) {
1159                     return ret;
1160                 }
1161             }
1162         }
1163         field++;
1164     }
1165     if (vmsd->post_load) {
1166         return vmsd->post_load(opaque, version_id);
1167     }
1168     return 0;
1169 }
1170
1171 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1172                         void *opaque)
1173 {
1174     VMStateField *field = vmsd->fields;
1175
1176     if (vmsd->pre_save) {
1177         vmsd->pre_save(opaque);
1178     }
1179     while(field->name) {
1180         if (!field->field_exists ||
1181             field->field_exists(opaque, vmsd->version_id)) {
1182             void *base_addr = opaque + field->offset;
1183             int i, n_elems = 1;
1184
1185             if (field->flags & VMS_ARRAY) {
1186                 n_elems = field->num;
1187             } else if (field->flags & VMS_VARRAY_INT32) {
1188                 n_elems = *(int32_t *)(opaque+field->num_offset);
1189             } else if (field->flags & VMS_VARRAY_UINT16) {
1190                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1191             }
1192             if (field->flags & VMS_POINTER) {
1193                 base_addr = *(void **)base_addr;
1194             }
1195             for (i = 0; i < n_elems; i++) {
1196                 void *addr = base_addr + field->size * i;
1197
1198                 if (field->flags & VMS_STRUCT) {
1199                     vmstate_save_state(f, field->vmsd, addr);
1200                 } else {
1201                     field->info->put(f, addr, field->size);
1202                 }
1203             }
1204         }
1205         field++;
1206     }
1207     if (vmsd->post_save) {
1208         vmsd->post_save(opaque);
1209     }
1210 }
1211
1212 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1213 {
1214     if (!se->vmsd) {         /* Old style */
1215         return se->load_state(f, se->opaque, version_id);
1216     }
1217     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1218 }
1219
1220 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1221 {
1222     if (!se->vmsd) {         /* Old style */
1223         se->save_state(f, se->opaque);
1224         return;
1225     }
1226     vmstate_save_state(f,se->vmsd, se->opaque);
1227 }
1228
1229 #define QEMU_VM_FILE_MAGIC           0x5145564d
1230 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1231 #define QEMU_VM_FILE_VERSION         0x00000003
1232
1233 #define QEMU_VM_EOF                  0x00
1234 #define QEMU_VM_SECTION_START        0x01
1235 #define QEMU_VM_SECTION_PART         0x02
1236 #define QEMU_VM_SECTION_END          0x03
1237 #define QEMU_VM_SECTION_FULL         0x04
1238
1239 int qemu_savevm_state_begin(QEMUFile *f, int blk_enable, int shared)
1240 {
1241     SaveStateEntry *se;
1242
1243     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1244         if(se->set_params == NULL) {
1245             continue;
1246         }
1247         se->set_params(blk_enable, shared, se->opaque);
1248     }
1249
1250     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1251     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1252
1253     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1254         int len;
1255
1256         if (se->save_live_state == NULL)
1257             continue;
1258
1259         /* Section type */
1260         qemu_put_byte(f, QEMU_VM_SECTION_START);
1261         qemu_put_be32(f, se->section_id);
1262
1263         /* ID string */
1264         len = strlen(se->idstr);
1265         qemu_put_byte(f, len);
1266         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1267
1268         qemu_put_be32(f, se->instance_id);
1269         qemu_put_be32(f, se->version_id);
1270
1271         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1272     }
1273
1274     if (qemu_file_has_error(f))
1275         return -EIO;
1276
1277     return 0;
1278 }
1279
1280 int qemu_savevm_state_iterate(QEMUFile *f)
1281 {
1282     SaveStateEntry *se;
1283     int ret = 1;
1284
1285     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1286         if (se->save_live_state == NULL)
1287             continue;
1288
1289         /* Section type */
1290         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1291         qemu_put_be32(f, se->section_id);
1292
1293         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1294     }
1295
1296     if (ret)
1297         return 1;
1298
1299     if (qemu_file_has_error(f))
1300         return -EIO;
1301
1302     return 0;
1303 }
1304
1305 int qemu_savevm_state_complete(QEMUFile *f)
1306 {
1307     SaveStateEntry *se;
1308
1309     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1310         if (se->save_live_state == NULL)
1311             continue;
1312
1313         /* Section type */
1314         qemu_put_byte(f, QEMU_VM_SECTION_END);
1315         qemu_put_be32(f, se->section_id);
1316
1317         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1318     }
1319
1320     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1321         int len;
1322
1323         if (se->save_state == NULL && se->vmsd == NULL)
1324             continue;
1325
1326         /* Section type */
1327         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1328         qemu_put_be32(f, se->section_id);
1329
1330         /* ID string */
1331         len = strlen(se->idstr);
1332         qemu_put_byte(f, len);
1333         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1334
1335         qemu_put_be32(f, se->instance_id);
1336         qemu_put_be32(f, se->version_id);
1337
1338         vmstate_save(f, se);
1339     }
1340
1341     qemu_put_byte(f, QEMU_VM_EOF);
1342
1343     if (qemu_file_has_error(f))
1344         return -EIO;
1345
1346     return 0;
1347 }
1348
1349 int qemu_savevm_state(QEMUFile *f)
1350 {
1351     int saved_vm_running;
1352     int ret;
1353
1354     saved_vm_running = vm_running;
1355     vm_stop(0);
1356
1357     bdrv_flush_all();
1358
1359     ret = qemu_savevm_state_begin(f, 0, 0);
1360     if (ret < 0)
1361         goto out;
1362
1363     do {
1364         ret = qemu_savevm_state_iterate(f);
1365         if (ret < 0)
1366             goto out;
1367     } while (ret == 0);
1368
1369     ret = qemu_savevm_state_complete(f);
1370
1371 out:
1372     if (qemu_file_has_error(f))
1373         ret = -EIO;
1374
1375     if (!ret && saved_vm_running)
1376         vm_start();
1377
1378     return ret;
1379 }
1380
1381 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1382 {
1383     SaveStateEntry *se;
1384
1385     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1386         if (!strcmp(se->idstr, idstr) &&
1387             instance_id == se->instance_id)
1388             return se;
1389     }
1390     return NULL;
1391 }
1392
1393 typedef struct LoadStateEntry {
1394     QLIST_ENTRY(LoadStateEntry) entry;
1395     SaveStateEntry *se;
1396     int section_id;
1397     int version_id;
1398 } LoadStateEntry;
1399
1400 int qemu_loadvm_state(QEMUFile *f)
1401 {
1402     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1403         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1404     LoadStateEntry *le, *new_le;
1405     uint8_t section_type;
1406     unsigned int v;
1407     int ret;
1408
1409     v = qemu_get_be32(f);
1410     if (v != QEMU_VM_FILE_MAGIC)
1411         return -EINVAL;
1412
1413     v = qemu_get_be32(f);
1414     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1415         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1416         return -ENOTSUP;
1417     }
1418     if (v != QEMU_VM_FILE_VERSION)
1419         return -ENOTSUP;
1420
1421     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1422         uint32_t instance_id, version_id, section_id;
1423         SaveStateEntry *se;
1424         char idstr[257];
1425         int len;
1426
1427         switch (section_type) {
1428         case QEMU_VM_SECTION_START:
1429         case QEMU_VM_SECTION_FULL:
1430             /* Read section start */
1431             section_id = qemu_get_be32(f);
1432             len = qemu_get_byte(f);
1433             qemu_get_buffer(f, (uint8_t *)idstr, len);
1434             idstr[len] = 0;
1435             instance_id = qemu_get_be32(f);
1436             version_id = qemu_get_be32(f);
1437
1438             /* Find savevm section */
1439             se = find_se(idstr, instance_id);
1440             if (se == NULL) {
1441                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1442                 ret = -EINVAL;
1443                 goto out;
1444             }
1445
1446             /* Validate version */
1447             if (version_id > se->version_id) {
1448                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1449                         version_id, idstr, se->version_id);
1450                 ret = -EINVAL;
1451                 goto out;
1452             }
1453
1454             /* Add entry */
1455             le = qemu_mallocz(sizeof(*le));
1456
1457             le->se = se;
1458             le->section_id = section_id;
1459             le->version_id = version_id;
1460             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1461
1462             ret = vmstate_load(f, le->se, le->version_id);
1463             if (ret < 0) {
1464                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1465                         instance_id, idstr);
1466                 goto out;
1467             }
1468             break;
1469         case QEMU_VM_SECTION_PART:
1470         case QEMU_VM_SECTION_END:
1471             section_id = qemu_get_be32(f);
1472
1473             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1474                 if (le->section_id == section_id) {
1475                     break;
1476                 }
1477             }
1478             if (le == NULL) {
1479                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1480                 ret = -EINVAL;
1481                 goto out;
1482             }
1483
1484             ret = vmstate_load(f, le->se, le->version_id);
1485             if (ret < 0) {
1486                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1487                         section_id);
1488                 goto out;
1489             }
1490             break;
1491         default:
1492             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1493             ret = -EINVAL;
1494             goto out;
1495         }
1496     }
1497
1498     ret = 0;
1499
1500 out:
1501     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1502         QLIST_REMOVE(le, entry);
1503         qemu_free(le);
1504     }
1505
1506     if (qemu_file_has_error(f))
1507         ret = -EIO;
1508
1509     return ret;
1510 }
1511
1512 /* device can contain snapshots */
1513 static int bdrv_can_snapshot(BlockDriverState *bs)
1514 {
1515     return (bs &&
1516             !bdrv_is_removable(bs) &&
1517             !bdrv_is_read_only(bs));
1518 }
1519
1520 /* device must be snapshots in order to have a reliable snapshot */
1521 static int bdrv_has_snapshot(BlockDriverState *bs)
1522 {
1523     return (bs &&
1524             !bdrv_is_removable(bs) &&
1525             !bdrv_is_read_only(bs));
1526 }
1527
1528 static BlockDriverState *get_bs_snapshots(void)
1529 {
1530     BlockDriverState *bs;
1531     DriveInfo *dinfo;
1532
1533     if (bs_snapshots)
1534         return bs_snapshots;
1535     QTAILQ_FOREACH(dinfo, &drives, next) {
1536         bs = dinfo->bdrv;
1537         if (bdrv_can_snapshot(bs))
1538             goto ok;
1539     }
1540     return NULL;
1541  ok:
1542     bs_snapshots = bs;
1543     return bs;
1544 }
1545
1546 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1547                               const char *name)
1548 {
1549     QEMUSnapshotInfo *sn_tab, *sn;
1550     int nb_sns, i, ret;
1551
1552     ret = -ENOENT;
1553     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1554     if (nb_sns < 0)
1555         return ret;
1556     for(i = 0; i < nb_sns; i++) {
1557         sn = &sn_tab[i];
1558         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1559             *sn_info = *sn;
1560             ret = 0;
1561             break;
1562         }
1563     }
1564     qemu_free(sn_tab);
1565     return ret;
1566 }
1567
1568 /*
1569  * Deletes snapshots of a given name in all opened images.
1570  */
1571 static int del_existing_snapshots(Monitor *mon, const char *name)
1572 {
1573     BlockDriverState *bs;
1574     DriveInfo *dinfo;
1575     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1576     int ret;
1577
1578     QTAILQ_FOREACH(dinfo, &drives, next) {
1579         bs = dinfo->bdrv;
1580         if (bdrv_can_snapshot(bs) &&
1581             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1582         {
1583             ret = bdrv_snapshot_delete(bs, name);
1584             if (ret < 0) {
1585                 monitor_printf(mon,
1586                                "Error while deleting snapshot on '%s'\n",
1587                                bdrv_get_device_name(bs));
1588                 return -1;
1589             }
1590         }
1591     }
1592
1593     return 0;
1594 }
1595
1596 void do_savevm(Monitor *mon, const QDict *qdict)
1597 {
1598     DriveInfo *dinfo;
1599     BlockDriverState *bs, *bs1;
1600     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1601     int ret;
1602     QEMUFile *f;
1603     int saved_vm_running;
1604     uint32_t vm_state_size;
1605 #ifdef _WIN32
1606     struct _timeb tb;
1607 #else
1608     struct timeval tv;
1609 #endif
1610     const char *name = qdict_get_try_str(qdict, "name");
1611
1612     bs = get_bs_snapshots();
1613     if (!bs) {
1614         monitor_printf(mon, "No block device can accept snapshots\n");
1615         return;
1616     }
1617
1618     /* ??? Should this occur after vm_stop?  */
1619     qemu_aio_flush();
1620
1621     saved_vm_running = vm_running;
1622     vm_stop(0);
1623
1624     memset(sn, 0, sizeof(*sn));
1625     if (name) {
1626         ret = bdrv_snapshot_find(bs, old_sn, name);
1627         if (ret >= 0) {
1628             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1629             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1630         } else {
1631             pstrcpy(sn->name, sizeof(sn->name), name);
1632         }
1633     }
1634
1635     /* fill auxiliary fields */
1636 #ifdef _WIN32
1637     _ftime(&tb);
1638     sn->date_sec = tb.time;
1639     sn->date_nsec = tb.millitm * 1000000;
1640 #else
1641     gettimeofday(&tv, NULL);
1642     sn->date_sec = tv.tv_sec;
1643     sn->date_nsec = tv.tv_usec * 1000;
1644 #endif
1645     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1646
1647     /* Delete old snapshots of the same name */
1648     if (del_existing_snapshots(mon, name) < 0) {
1649         goto the_end;
1650     }
1651
1652     /* save the VM state */
1653     f = qemu_fopen_bdrv(bs, 1);
1654     if (!f) {
1655         monitor_printf(mon, "Could not open VM state file\n");
1656         goto the_end;
1657     }
1658     ret = qemu_savevm_state(f);
1659     vm_state_size = qemu_ftell(f);
1660     qemu_fclose(f);
1661     if (ret < 0) {
1662         monitor_printf(mon, "Error %d while writing VM\n", ret);
1663         goto the_end;
1664     }
1665
1666     /* create the snapshots */
1667
1668     QTAILQ_FOREACH(dinfo, &drives, next) {
1669         bs1 = dinfo->bdrv;
1670         if (bdrv_has_snapshot(bs1)) {
1671             /* Write VM state size only to the image that contains the state */
1672             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1673             ret = bdrv_snapshot_create(bs1, sn);
1674             if (ret < 0) {
1675                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1676                                bdrv_get_device_name(bs1));
1677             }
1678         }
1679     }
1680
1681  the_end:
1682     if (saved_vm_running)
1683         vm_start();
1684 }
1685
1686 int load_vmstate(Monitor *mon, const char *name)
1687 {
1688     DriveInfo *dinfo;
1689     BlockDriverState *bs, *bs1;
1690     QEMUSnapshotInfo sn;
1691     QEMUFile *f;
1692     int ret;
1693
1694     bs = get_bs_snapshots();
1695     if (!bs) {
1696         monitor_printf(mon, "No block device supports snapshots\n");
1697         return -EINVAL;
1698     }
1699
1700     /* Flush all IO requests so they don't interfere with the new state.  */
1701     qemu_aio_flush();
1702
1703     QTAILQ_FOREACH(dinfo, &drives, next) {
1704         bs1 = dinfo->bdrv;
1705         if (bdrv_has_snapshot(bs1)) {
1706             ret = bdrv_snapshot_goto(bs1, name);
1707             if (ret < 0) {
1708                 if (bs != bs1)
1709                     monitor_printf(mon, "Warning: ");
1710                 switch(ret) {
1711                 case -ENOTSUP:
1712                     monitor_printf(mon,
1713                                    "Snapshots not supported on device '%s'\n",
1714                                    bdrv_get_device_name(bs1));
1715                     break;
1716                 case -ENOENT:
1717                     monitor_printf(mon, "Could not find snapshot '%s' on "
1718                                    "device '%s'\n",
1719                                    name, bdrv_get_device_name(bs1));
1720                     break;
1721                 default:
1722                     monitor_printf(mon, "Error %d while activating snapshot on"
1723                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1724                     break;
1725                 }
1726                 /* fatal on snapshot block device */
1727                 if (bs == bs1)
1728                     return 0;
1729             }
1730         }
1731     }
1732
1733     /* Don't even try to load empty VM states */
1734     ret = bdrv_snapshot_find(bs, &sn, name);
1735     if ((ret >= 0) && (sn.vm_state_size == 0))
1736         return -EINVAL;
1737
1738     /* restore the VM state */
1739     f = qemu_fopen_bdrv(bs, 0);
1740     if (!f) {
1741         monitor_printf(mon, "Could not open VM state file\n");
1742         return -EINVAL;
1743     }
1744     ret = qemu_loadvm_state(f);
1745     qemu_fclose(f);
1746     if (ret < 0) {
1747         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1748         return ret;
1749     }
1750     return 0;
1751 }
1752
1753 void do_delvm(Monitor *mon, const QDict *qdict)
1754 {
1755     DriveInfo *dinfo;
1756     BlockDriverState *bs, *bs1;
1757     int ret;
1758     const char *name = qdict_get_str(qdict, "name");
1759
1760     bs = get_bs_snapshots();
1761     if (!bs) {
1762         monitor_printf(mon, "No block device supports snapshots\n");
1763         return;
1764     }
1765
1766     QTAILQ_FOREACH(dinfo, &drives, next) {
1767         bs1 = dinfo->bdrv;
1768         if (bdrv_has_snapshot(bs1)) {
1769             ret = bdrv_snapshot_delete(bs1, name);
1770             if (ret < 0) {
1771                 if (ret == -ENOTSUP)
1772                     monitor_printf(mon,
1773                                    "Snapshots not supported on device '%s'\n",
1774                                    bdrv_get_device_name(bs1));
1775                 else
1776                     monitor_printf(mon, "Error %d while deleting snapshot on "
1777                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1778             }
1779         }
1780     }
1781 }
1782
1783 void do_info_snapshots(Monitor *mon)
1784 {
1785     DriveInfo *dinfo;
1786     BlockDriverState *bs, *bs1;
1787     QEMUSnapshotInfo *sn_tab, *sn;
1788     int nb_sns, i;
1789     char buf[256];
1790
1791     bs = get_bs_snapshots();
1792     if (!bs) {
1793         monitor_printf(mon, "No available block device supports snapshots\n");
1794         return;
1795     }
1796     monitor_printf(mon, "Snapshot devices:");
1797     QTAILQ_FOREACH(dinfo, &drives, next) {
1798         bs1 = dinfo->bdrv;
1799         if (bdrv_has_snapshot(bs1)) {
1800             if (bs == bs1)
1801                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1802         }
1803     }
1804     monitor_printf(mon, "\n");
1805
1806     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1807     if (nb_sns < 0) {
1808         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1809         return;
1810     }
1811     monitor_printf(mon, "Snapshot list (from %s):\n",
1812                    bdrv_get_device_name(bs));
1813     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1814     for(i = 0; i < nb_sns; i++) {
1815         sn = &sn_tab[i];
1816         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1817     }
1818     qemu_free(sn_tab);
1819 }