savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #include <arpa/inet.h>
  46 #include <dirent.h>
  47 #include <netdb.h>
  48 #include <sys/select.h>
  49 #ifdef CONFIG_BSD
  50 #include <sys/stat.h>
  51 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  52 #include <libutil.h>
  53 #else
  54 #include <util.h>
  55 #endif
  56 #ifdef __linux__
  57 #include <pty.h>
  58 #include <malloc.h>
  59 #include <linux/rtc.h>
  60 #endif
  61 #endif
  62 #endif
  63
  64 #ifdef _WIN32
  65 #include <windows.h>
  66 #include <malloc.h>
  67 #include <sys/timeb.h>
  68 #include <mmsystem.h>
  69 #define getopt_long_only getopt_long
  70 #define memalign(align, size) malloc(size)
  71 #endif
  72
  73 #include "qemu-common.h"
  74 #include "hw/hw.h"
  75 #include "net.h"
  76 #include "monitor.h"
  77 #include "sysemu.h"
  78 #include "qemu-timer.h"
  79 #include "qemu-char.h"
  80 #include "blockdev.h"
  81 #include "audio/audio.h"
  82 #include "migration.h"
  83 #include "qemu_socket.h"
  84 #include "qemu-queue.h"
  85
  86 #define SELF_ANNOUNCE_ROUNDS 5
  87
  88 #ifndef ETH_P_RARP
  89 #define ETH_P_RARP 0x8035
  90 #endif
  91 #define ARP_HTYPE_ETH 0x0001
  92 #define ARP_PTYPE_IP 0x0800
  93 #define ARP_OP_REQUEST_REV 0x3
  94
  95 static int announce_self_create(uint8_t *buf,
  96                                 uint8_t *mac_addr)
  97 {
  98     /* Ethernet header. */
  99     memset(buf, 0xff, 6);         /* destination MAC addr */
 100     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 101     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 102
 103     /* RARP header. */
 104     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 105     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 106     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 107     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 108     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 109     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 110     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 111     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 112     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 113
 114     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 115     memset(buf + 42, 0x00, 18);
 116
 117     return 60; /* len (FCS will be added by hardware) */
 118 }
 119
 120 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 121 {
 122     uint8_t buf[60];
 123     int len;
 124
 125     len = announce_self_create(buf, nic->conf->macaddr.a);
 126
 127     qemu_send_packet_raw(&nic->nc, buf, len);
 128 }
 129
 130
 131 static void qemu_announce_self_once(void *opaque)
 132 {
 133     static int count = SELF_ANNOUNCE_ROUNDS;
 134     QEMUTimer *timer = *(QEMUTimer **)opaque;
 135
 136     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 137
 138     if (--count) {
 139         /* delay 50ms, 150ms, 250ms, ... */
 140         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 141                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 142     } else {
 143             qemu_del_timer(timer);
 144             qemu_free_timer(timer);
 145     }
 146 }
 147
 148 void qemu_announce_self(void)
 149 {
 150         static QEMUTimer *timer;
 151         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 152         qemu_announce_self_once(&timer);
 153 }
 154
 155 /***********************************************************/
 156 /* savevm/loadvm support */
 157
 158 #define IO_BUF_SIZE 32768
 159
 160 struct QEMUFile {
 161     QEMUFilePutBufferFunc *put_buffer;
 162     QEMUFileGetBufferFunc *get_buffer;
 163     QEMUFileCloseFunc *close;
 164     QEMUFileRateLimit *rate_limit;
 165     QEMUFileSetRateLimit *set_rate_limit;
 166     QEMUFileGetRateLimit *get_rate_limit;
 167     void *opaque;
 168     int is_write;
 169
 170     int64_t buf_offset; /* start of buffer when writing, end of buffer
 171                            when reading */
 172     int buf_index;
 173     int buf_size; /* 0 when writing */
 174     uint8_t buf[IO_BUF_SIZE];
 175
 176     int has_error;
 177 };
 178
 179 typedef struct QEMUFileStdio
 180 {
 181     FILE *stdio_file;
 182     QEMUFile *file;
 183 } QEMUFileStdio;
 184
 185 typedef struct QEMUFileSocket
 186 {
 187     int fd;
 188     QEMUFile *file;
 189 } QEMUFileSocket;
 190
 191 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 192 {
 193     QEMUFileSocket *s = opaque;
 194     ssize_t len;
 195
 196     do {
 197         len = recv(s->fd, (void *)buf, size, 0);
 198     } while (len == -1 && socket_error() == EINTR);
 199
 200     if (len == -1)
 201         len = -socket_error();
 202
 203     return len;
 204 }
 205
 206 static int socket_close(void *opaque)
 207 {
 208     QEMUFileSocket *s = opaque;
 209     qemu_free(s);
 210     return 0;
 211 }
 212
 213 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 214 {
 215     QEMUFileStdio *s = opaque;
 216     return fwrite(buf, 1, size, s->stdio_file);
 217 }
 218
 219 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 220 {
 221     QEMUFileStdio *s = opaque;
 222     FILE *fp = s->stdio_file;
 223     int bytes;
 224
 225     do {
 226         clearerr(fp);
 227         bytes = fread(buf, 1, size, fp);
 228     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 229     return bytes;
 230 }
 231
 232 static int stdio_pclose(void *opaque)
 233 {
 234     QEMUFileStdio *s = opaque;
 235     int ret;
 236     ret = pclose(s->stdio_file);
 237     qemu_free(s);
 238     return ret;
 239 }
 240
 241 static int stdio_fclose(void *opaque)
 242 {
 243     QEMUFileStdio *s = opaque;
 244     fclose(s->stdio_file);
 245     qemu_free(s);
 246     return 0;
 247 }
 248
 249 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 250 {
 251     QEMUFileStdio *s;
 252
 253     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 254         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 255         return NULL;
 256     }
 257
 258     s = qemu_mallocz(sizeof(QEMUFileStdio));
 259
 260     s->stdio_file = stdio_file;
 261
 262     if(mode[0] == 'r') {
 263         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 264                                  NULL, NULL, NULL);
 265     } else {
 266         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 267                                  NULL, NULL, NULL);
 268     }
 269     return s->file;
 270 }
 271
 272 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 273 {
 274     FILE *popen_file;
 275
 276     popen_file = popen(command, mode);
 277     if(popen_file == NULL) {
 278         return NULL;
 279     }
 280
 281     return qemu_popen(popen_file, mode);
 282 }
 283
 284 int qemu_stdio_fd(QEMUFile *f)
 285 {
 286     QEMUFileStdio *p;
 287     int fd;
 288
 289     p = (QEMUFileStdio *)f->opaque;
 290     fd = fileno(p->stdio_file);
 291
 292     return fd;
 293 }
 294
 295 QEMUFile *qemu_fdopen(int fd, const char *mode)
 296 {
 297     QEMUFileStdio *s;
 298
 299     if (mode == NULL ||
 300         (mode[0] != 'r' && mode[0] != 'w') ||
 301         mode[1] != 'b' || mode[2] != 0) {
 302         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 303         return NULL;
 304     }
 305
 306     s = qemu_mallocz(sizeof(QEMUFileStdio));
 307     s->stdio_file = fdopen(fd, mode);
 308     if (!s->stdio_file)
 309         goto fail;
 310
 311     if(mode[0] == 'r') {
 312         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 313                                  NULL, NULL, NULL);
 314     } else {
 315         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 316                                  NULL, NULL, NULL);
 317     }
 318     return s->file;
 319
 320 fail:
 321     qemu_free(s);
 322     return NULL;
 323 }
 324
 325 QEMUFile *qemu_fopen_socket(int fd)
 326 {
 327     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 328
 329     s->fd = fd;
 330     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 331                              NULL, NULL, NULL);
 332     return s->file;
 333 }
 334
 335 static int file_put_buffer(void *opaque, const uint8_t *buf,
 336                             int64_t pos, int size)
 337 {
 338     QEMUFileStdio *s = opaque;
 339     fseek(s->stdio_file, pos, SEEK_SET);
 340     return fwrite(buf, 1, size, s->stdio_file);
 341 }
 342
 343 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 344 {
 345     QEMUFileStdio *s = opaque;
 346     fseek(s->stdio_file, pos, SEEK_SET);
 347     return fread(buf, 1, size, s->stdio_file);
 348 }
 349
 350 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 351 {
 352     QEMUFileStdio *s;
 353
 354     if (mode == NULL ||
 355         (mode[0] != 'r' && mode[0] != 'w') ||
 356         mode[1] != 'b' || mode[2] != 0) {
 357         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 358         return NULL;
 359     }
 360
 361     s = qemu_mallocz(sizeof(QEMUFileStdio));
 362
 363     s->stdio_file = fopen(filename, mode);
 364     if (!s->stdio_file)
 365         goto fail;
 366
 367     if(mode[0] == 'w') {
 368         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 369                                  NULL, NULL, NULL);
 370     } else {
 371         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 372                                NULL, NULL, NULL);
 373     }
 374     return s->file;
 375 fail:
 376     qemu_free(s);
 377     return NULL;
 378 }
 379
 380 static int block_put_buffer(void *opaque, const uint8_t *buf,
 381                            int64_t pos, int size)
 382 {
 383     bdrv_save_vmstate(opaque, buf, pos, size);
 384     return size;
 385 }
 386
 387 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 388 {
 389     return bdrv_load_vmstate(opaque, buf, pos, size);
 390 }
 391
 392 static int bdrv_fclose(void *opaque)
 393 {
 394     return 0;
 395 }
 396
 397 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 398 {
 399     if (is_writable)
 400         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 401                               NULL, NULL, NULL);
 402     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 403 }
 404
 405 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 406                          QEMUFileGetBufferFunc *get_buffer,
 407                          QEMUFileCloseFunc *close,
 408                          QEMUFileRateLimit *rate_limit,
 409                          QEMUFileSetRateLimit *set_rate_limit,
 410                          QEMUFileGetRateLimit *get_rate_limit)
 411 {
 412     QEMUFile *f;
 413
 414     f = qemu_mallocz(sizeof(QEMUFile));
 415
 416     f->opaque = opaque;
 417     f->put_buffer = put_buffer;
 418     f->get_buffer = get_buffer;
 419     f->close = close;
 420     f->rate_limit = rate_limit;
 421     f->set_rate_limit = set_rate_limit;
 422     f->get_rate_limit = get_rate_limit;
 423     f->is_write = 0;
 424
 425     return f;
 426 }
 427
 428 int qemu_file_has_error(QEMUFile *f)
 429 {
 430     return f->has_error;
 431 }
 432
 433 void qemu_file_set_error(QEMUFile *f)
 434 {
 435     f->has_error = 1;
 436 }
 437
 438 void qemu_fflush(QEMUFile *f)
 439 {
 440     if (!f->put_buffer)
 441         return;
 442
 443     if (f->is_write && f->buf_index > 0) {
 444         int len;
 445
 446         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 447         if (len > 0)
 448             f->buf_offset += f->buf_index;
 449         else
 450             f->has_error = 1;
 451         f->buf_index = 0;
 452     }
 453 }
 454
 455 static void qemu_fill_buffer(QEMUFile *f)
 456 {
 457     int len;
 458
 459     if (!f->get_buffer)
 460         return;
 461
 462     if (f->is_write)
 463         abort();
 464
 465     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 466     if (len > 0) {
 467         f->buf_index = 0;
 468         f->buf_size = len;
 469         f->buf_offset += len;
 470     } else if (len != -EAGAIN)
 471         f->has_error = 1;
 472 }
 473
 474 int qemu_fclose(QEMUFile *f)
 475 {
 476     int ret = 0;
 477     qemu_fflush(f);
 478     if (f->close)
 479         ret = f->close(f->opaque);
 480     qemu_free(f);
 481     return ret;
 482 }
 483
 484 void qemu_file_put_notify(QEMUFile *f)
 485 {
 486     f->put_buffer(f->opaque, NULL, 0, 0);
 487 }
 488
 489 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 490 {
 491     int l;
 492
 493     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 494         fprintf(stderr,
 495                 "Attempted to write to buffer while read buffer is not empty\n");
 496         abort();
 497     }
 498
 499     while (!f->has_error && size > 0) {
 500         l = IO_BUF_SIZE - f->buf_index;
 501         if (l > size)
 502             l = size;
 503         memcpy(f->buf + f->buf_index, buf, l);
 504         f->is_write = 1;
 505         f->buf_index += l;
 506         buf += l;
 507         size -= l;
 508         if (f->buf_index >= IO_BUF_SIZE)
 509             qemu_fflush(f);
 510     }
 511 }
 512
 513 void qemu_put_byte(QEMUFile *f, int v)
 514 {
 515     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 516         fprintf(stderr,
 517                 "Attempted to write to buffer while read buffer is not empty\n");
 518         abort();
 519     }
 520
 521     f->buf[f->buf_index++] = v;
 522     f->is_write = 1;
 523     if (f->buf_index >= IO_BUF_SIZE)
 524         qemu_fflush(f);
 525 }
 526
 527 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 528 {
 529     int size, l;
 530
 531     if (f->is_write)
 532         abort();
 533
 534     size = size1;
 535     while (size > 0) {
 536         l = f->buf_size - f->buf_index;
 537         if (l == 0) {
 538             qemu_fill_buffer(f);
 539             l = f->buf_size - f->buf_index;
 540             if (l == 0)
 541                 break;
 542         }
 543         if (l > size)
 544             l = size;
 545         memcpy(buf, f->buf + f->buf_index, l);
 546         f->buf_index += l;
 547         buf += l;
 548         size -= l;
 549     }
 550     return size1 - size;
 551 }
 552
 553 int qemu_get_byte(QEMUFile *f)
 554 {
 555     if (f->is_write)
 556         abort();
 557
 558     if (f->buf_index >= f->buf_size) {
 559         qemu_fill_buffer(f);
 560         if (f->buf_index >= f->buf_size)
 561             return 0;
 562     }
 563     return f->buf[f->buf_index++];
 564 }
 565
 566 int64_t qemu_ftell(QEMUFile *f)
 567 {
 568     return f->buf_offset - f->buf_size + f->buf_index;
 569 }
 570
 571 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 572 {
 573     if (whence == SEEK_SET) {
 574         /* nothing to do */
 575     } else if (whence == SEEK_CUR) {
 576         pos += qemu_ftell(f);
 577     } else {
 578         /* SEEK_END not supported */
 579         return -1;
 580     }
 581     if (f->put_buffer) {
 582         qemu_fflush(f);
 583         f->buf_offset = pos;
 584     } else {
 585         f->buf_offset = pos;
 586         f->buf_index = 0;
 587         f->buf_size = 0;
 588     }
 589     return pos;
 590 }
 591
 592 int qemu_file_rate_limit(QEMUFile *f)
 593 {
 594     if (f->rate_limit)
 595         return f->rate_limit(f->opaque);
 596
 597     return 0;
 598 }
 599
 600 size_t qemu_file_get_rate_limit(QEMUFile *f)
 601 {
 602     if (f->get_rate_limit)
 603         return f->get_rate_limit(f->opaque);
 604
 605     return 0;
 606 }
 607
 608 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 609 {
 610     /* any failed or completed migration keeps its state to allow probing of
 611      * migration data, but has no associated file anymore */
 612     if (f && f->set_rate_limit)
 613         return f->set_rate_limit(f->opaque, new_rate);
 614
 615     return 0;
 616 }
 617
 618 void qemu_put_be16(QEMUFile *f, unsigned int v)
 619 {
 620     qemu_put_byte(f, v >> 8);
 621     qemu_put_byte(f, v);
 622 }
 623
 624 void qemu_put_be32(QEMUFile *f, unsigned int v)
 625 {
 626     qemu_put_byte(f, v >> 24);
 627     qemu_put_byte(f, v >> 16);
 628     qemu_put_byte(f, v >> 8);
 629     qemu_put_byte(f, v);
 630 }
 631
 632 void qemu_put_be64(QEMUFile *f, uint64_t v)
 633 {
 634     qemu_put_be32(f, v >> 32);
 635     qemu_put_be32(f, v);
 636 }
 637
 638 unsigned int qemu_get_be16(QEMUFile *f)
 639 {
 640     unsigned int v;
 641     v = qemu_get_byte(f) << 8;
 642     v |= qemu_get_byte(f);
 643     return v;
 644 }
 645
 646 unsigned int qemu_get_be32(QEMUFile *f)
 647 {
 648     unsigned int v;
 649     v = qemu_get_byte(f) << 24;
 650     v |= qemu_get_byte(f) << 16;
 651     v |= qemu_get_byte(f) << 8;
 652     v |= qemu_get_byte(f);
 653     return v;
 654 }
 655
 656 uint64_t qemu_get_be64(QEMUFile *f)
 657 {
 658     uint64_t v;
 659     v = (uint64_t)qemu_get_be32(f) << 32;
 660     v |= qemu_get_be32(f);
 661     return v;
 662 }
 663
 664 /* 8 bit int */
 665
 666 static int get_int8(QEMUFile *f, void *pv, size_t size)
 667 {
 668     int8_t *v = pv;
 669     qemu_get_s8s(f, v);
 670     return 0;
 671 }
 672
 673 static void put_int8(QEMUFile *f, void *pv, size_t size)
 674 {
 675     int8_t *v = pv;
 676     qemu_put_s8s(f, v);
 677 }
 678
 679 const VMStateInfo vmstate_info_int8 = {
 680     .name = "int8",
 681     .get  = get_int8,
 682     .put  = put_int8,
 683 };
 684
 685 /* 16 bit int */
 686
 687 static int get_int16(QEMUFile *f, void *pv, size_t size)
 688 {
 689     int16_t *v = pv;
 690     qemu_get_sbe16s(f, v);
 691     return 0;
 692 }
 693
 694 static void put_int16(QEMUFile *f, void *pv, size_t size)
 695 {
 696     int16_t *v = pv;
 697     qemu_put_sbe16s(f, v);
 698 }
 699
 700 const VMStateInfo vmstate_info_int16 = {
 701     .name = "int16",
 702     .get  = get_int16,
 703     .put  = put_int16,
 704 };
 705
 706 /* 32 bit int */
 707
 708 static int get_int32(QEMUFile *f, void *pv, size_t size)
 709 {
 710     int32_t *v = pv;
 711     qemu_get_sbe32s(f, v);
 712     return 0;
 713 }
 714
 715 static void put_int32(QEMUFile *f, void *pv, size_t size)
 716 {
 717     int32_t *v = pv;
 718     qemu_put_sbe32s(f, v);
 719 }
 720
 721 const VMStateInfo vmstate_info_int32 = {
 722     .name = "int32",
 723     .get  = get_int32,
 724     .put  = put_int32,
 725 };
 726
 727 /* 32 bit int. See that the received value is the same than the one
 728    in the field */
 729
 730 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 731 {
 732     int32_t *v = pv;
 733     int32_t v2;
 734     qemu_get_sbe32s(f, &v2);
 735
 736     if (*v == v2)
 737         return 0;
 738     return -EINVAL;
 739 }
 740
 741 const VMStateInfo vmstate_info_int32_equal = {
 742     .name = "int32 equal",
 743     .get  = get_int32_equal,
 744     .put  = put_int32,
 745 };
 746
 747 /* 32 bit int. See that the received value is the less or the same
 748    than the one in the field */
 749
 750 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 751 {
 752     int32_t *old = pv;
 753     int32_t new;
 754     qemu_get_sbe32s(f, &new);
 755
 756     if (*old <= new)
 757         return 0;
 758     return -EINVAL;
 759 }
 760
 761 const VMStateInfo vmstate_info_int32_le = {
 762     .name = "int32 equal",
 763     .get  = get_int32_le,
 764     .put  = put_int32,
 765 };
 766
 767 /* 64 bit int */
 768
 769 static int get_int64(QEMUFile *f, void *pv, size_t size)
 770 {
 771     int64_t *v = pv;
 772     qemu_get_sbe64s(f, v);
 773     return 0;
 774 }
 775
 776 static void put_int64(QEMUFile *f, void *pv, size_t size)
 777 {
 778     int64_t *v = pv;
 779     qemu_put_sbe64s(f, v);
 780 }
 781
 782 const VMStateInfo vmstate_info_int64 = {
 783     .name = "int64",
 784     .get  = get_int64,
 785     .put  = put_int64,
 786 };
 787
 788 /* 8 bit unsigned int */
 789
 790 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 791 {
 792     uint8_t *v = pv;
 793     qemu_get_8s(f, v);
 794     return 0;
 795 }
 796
 797 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 798 {
 799     uint8_t *v = pv;
 800     qemu_put_8s(f, v);
 801 }
 802
 803 const VMStateInfo vmstate_info_uint8 = {
 804     .name = "uint8",
 805     .get  = get_uint8,
 806     .put  = put_uint8,
 807 };
 808
 809 /* 16 bit unsigned int */
 810
 811 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 812 {
 813     uint16_t *v = pv;
 814     qemu_get_be16s(f, v);
 815     return 0;
 816 }
 817
 818 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 819 {
 820     uint16_t *v = pv;
 821     qemu_put_be16s(f, v);
 822 }
 823
 824 const VMStateInfo vmstate_info_uint16 = {
 825     .name = "uint16",
 826     .get  = get_uint16,
 827     .put  = put_uint16,
 828 };
 829
 830 /* 32 bit unsigned int */
 831
 832 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 833 {
 834     uint32_t *v = pv;
 835     qemu_get_be32s(f, v);
 836     return 0;
 837 }
 838
 839 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 840 {
 841     uint32_t *v = pv;
 842     qemu_put_be32s(f, v);
 843 }
 844
 845 const VMStateInfo vmstate_info_uint32 = {
 846     .name = "uint32",
 847     .get  = get_uint32,
 848     .put  = put_uint32,
 849 };
 850
 851 /* 64 bit unsigned int */
 852
 853 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 854 {
 855     uint64_t *v = pv;
 856     qemu_get_be64s(f, v);
 857     return 0;
 858 }
 859
 860 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 861 {
 862     uint64_t *v = pv;
 863     qemu_put_be64s(f, v);
 864 }
 865
 866 const VMStateInfo vmstate_info_uint64 = {
 867     .name = "uint64",
 868     .get  = get_uint64,
 869     .put  = put_uint64,
 870 };
 871
 872 /* 8 bit int. See that the received value is the same than the one
 873    in the field */
 874
 875 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 876 {
 877     uint8_t *v = pv;
 878     uint8_t v2;
 879     qemu_get_8s(f, &v2);
 880
 881     if (*v == v2)
 882         return 0;
 883     return -EINVAL;
 884 }
 885
 886 const VMStateInfo vmstate_info_uint8_equal = {
 887     .name = "uint8 equal",
 888     .get  = get_uint8_equal,
 889     .put  = put_uint8,
 890 };
 891
 892 /* 16 bit unsigned int int. See that the received value is the same than the one
 893    in the field */
 894
 895 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 896 {
 897     uint16_t *v = pv;
 898     uint16_t v2;
 899     qemu_get_be16s(f, &v2);
 900
 901     if (*v == v2)
 902         return 0;
 903     return -EINVAL;
 904 }
 905
 906 const VMStateInfo vmstate_info_uint16_equal = {
 907     .name = "uint16 equal",
 908     .get  = get_uint16_equal,
 909     .put  = put_uint16,
 910 };
 911
 912 /* timers  */
 913
 914 static int get_timer(QEMUFile *f, void *pv, size_t size)
 915 {
 916     QEMUTimer *v = pv;
 917     qemu_get_timer(f, v);
 918     return 0;
 919 }
 920
 921 static void put_timer(QEMUFile *f, void *pv, size_t size)
 922 {
 923     QEMUTimer *v = pv;
 924     qemu_put_timer(f, v);
 925 }
 926
 927 const VMStateInfo vmstate_info_timer = {
 928     .name = "timer",
 929     .get  = get_timer,
 930     .put  = put_timer,
 931 };
 932
 933 /* uint8_t buffers */
 934
 935 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 936 {
 937     uint8_t *v = pv;
 938     qemu_get_buffer(f, v, size);
 939     return 0;
 940 }
 941
 942 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 943 {
 944     uint8_t *v = pv;
 945     qemu_put_buffer(f, v, size);
 946 }
 947
 948 const VMStateInfo vmstate_info_buffer = {
 949     .name = "buffer",
 950     .get  = get_buffer,
 951     .put  = put_buffer,
 952 };
 953
 954 /* unused buffers: space that was used for some fields that are
 955    not usefull anymore */
 956
 957 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 958 {
 959     uint8_t buf[1024];
 960     int block_len;
 961
 962     while (size > 0) {
 963         block_len = MIN(sizeof(buf), size);
 964         size -= block_len;
 965         qemu_get_buffer(f, buf, block_len);
 966     }
 967    return 0;
 968 }
 969
 970 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 971 {
 972     static const uint8_t buf[1024];
 973     int block_len;
 974
 975     while (size > 0) {
 976         block_len = MIN(sizeof(buf), size);
 977         size -= block_len;
 978         qemu_put_buffer(f, buf, block_len);
 979     }
 980 }
 981
 982 const VMStateInfo vmstate_info_unused_buffer = {
 983     .name = "unused_buffer",
 984     .get  = get_unused_buffer,
 985     .put  = put_unused_buffer,
 986 };
 987
 988 typedef struct SaveStateEntry {
 989     QTAILQ_ENTRY(SaveStateEntry) entry;
 990     char idstr[256];
 991     int instance_id;
 992     int alias_id;
 993     int version_id;
 994     int section_id;
 995     SaveSetParamsHandler *set_params;
 996     SaveLiveStateHandler *save_live_state;
 997     SaveStateHandler *save_state;
 998     LoadStateHandler *load_state;
 999     const VMStateDescription *vmsd;
1000     void *opaque;
1001 } SaveStateEntry;
1002
1003
1004 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1005     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1006 static int global_section_id;
1007
1008 static int calculate_new_instance_id(const char *idstr)
1009 {
1010     SaveStateEntry *se;
1011     int instance_id = 0;
1012
1013     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1014         if (strcmp(idstr, se->idstr) == 0
1015             && instance_id <= se->instance_id) {
1016             instance_id = se->instance_id + 1;
1017         }
1018     }
1019     return instance_id;
1020 }
1021
1022 /* TODO: Individual devices generally have very little idea about the rest
1023    of the system, so instance_id should be removed/replaced.
1024    Meanwhile pass -1 as instance_id if you do not already have a clearly
1025    distinguishing id for all instances of your device class. */
1026 int register_savevm_live(DeviceState *dev,
1027                          const char *idstr,
1028                          int instance_id,
1029                          int version_id,
1030                          SaveSetParamsHandler *set_params,
1031                          SaveLiveStateHandler *save_live_state,
1032                          SaveStateHandler *save_state,
1033                          LoadStateHandler *load_state,
1034                          void *opaque)
1035 {
1036     SaveStateEntry *se;
1037
1038     se = qemu_mallocz(sizeof(SaveStateEntry));
1039     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1040     se->version_id = version_id;
1041     se->section_id = global_section_id++;
1042     se->set_params = set_params;
1043     se->save_live_state = save_live_state;
1044     se->save_state = save_state;
1045     se->load_state = load_state;
1046     se->opaque = opaque;
1047     se->vmsd = NULL;
1048
1049     if (instance_id == -1) {
1050         se->instance_id = calculate_new_instance_id(idstr);
1051     } else {
1052         se->instance_id = instance_id;
1053     }
1054     /* add at the end of list */
1055     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1056     return 0;
1057 }
1058
1059 int register_savevm(DeviceState *dev,
1060                     const char *idstr,
1061                     int instance_id,
1062                     int version_id,
1063                     SaveStateHandler *save_state,
1064                     LoadStateHandler *load_state,
1065                     void *opaque)
1066 {
1067     return register_savevm_live(dev, idstr, instance_id, version_id,
1068                                 NULL, NULL, save_state, load_state, opaque);
1069 }
1070
1071 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1072 {
1073     SaveStateEntry *se, *new_se;
1074
1075     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1076         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1077             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1078             qemu_free(se);
1079         }
1080     }
1081 }
1082
1083 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1084                                    const VMStateDescription *vmsd,
1085                                    void *opaque, int alias_id,
1086                                    int required_for_version)
1087 {
1088     SaveStateEntry *se;
1089
1090     /* If this triggers, alias support can be dropped for the vmsd. */
1091     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1092
1093     se = qemu_mallocz(sizeof(SaveStateEntry));
1094     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1095     se->version_id = vmsd->version_id;
1096     se->section_id = global_section_id++;
1097     se->save_live_state = NULL;
1098     se->save_state = NULL;
1099     se->load_state = NULL;
1100     se->opaque = opaque;
1101     se->vmsd = vmsd;
1102     se->alias_id = alias_id;
1103
1104     if (instance_id == -1) {
1105         se->instance_id = calculate_new_instance_id(vmsd->name);
1106     } else {
1107         se->instance_id = instance_id;
1108     }
1109     /* add at the end of list */
1110     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1111     return 0;
1112 }
1113
1114 int vmstate_register(DeviceState *dev, int instance_id,
1115                      const VMStateDescription *vmsd, void *opaque)
1116 {
1117     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1118                                           opaque, -1, 0);
1119 }
1120
1121 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1122                         void *opaque)
1123 {
1124     SaveStateEntry *se, *new_se;
1125
1126     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1127         if (se->vmsd == vmsd && se->opaque == opaque) {
1128             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1129             qemu_free(se);
1130         }
1131     }
1132 }
1133
1134 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1135                        void *opaque, int version_id)
1136 {
1137     VMStateField *field = vmsd->fields;
1138
1139     if (version_id > vmsd->version_id) {
1140         return -EINVAL;
1141     }
1142     if (version_id < vmsd->minimum_version_id_old) {
1143         return -EINVAL;
1144     }
1145     if  (version_id < vmsd->minimum_version_id) {
1146         return vmsd->load_state_old(f, opaque, version_id);
1147     }
1148     if (vmsd->pre_load) {
1149         int ret = vmsd->pre_load(opaque);
1150         if (ret)
1151             return ret;
1152     }
1153     while(field->name) {
1154         if ((field->field_exists &&
1155              field->field_exists(opaque, version_id)) ||
1156             (!field->field_exists &&
1157              field->version_id <= version_id)) {
1158             void *base_addr = opaque + field->offset;
1159             int ret, i, n_elems = 1;
1160             int size = field->size;
1161
1162             if (field->flags & VMS_VBUFFER) {
1163                 size = *(int32_t *)(opaque+field->size_offset);
1164                 if (field->flags & VMS_MULTIPLY) {
1165                     size *= field->size;
1166                 }
1167             }
1168             if (field->flags & VMS_ARRAY) {
1169                 n_elems = field->num;
1170             } else if (field->flags & VMS_VARRAY_INT32) {
1171                 n_elems = *(int32_t *)(opaque+field->num_offset);
1172             } else if (field->flags & VMS_VARRAY_UINT16) {
1173                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1174             }
1175             if (field->flags & VMS_POINTER) {
1176                 base_addr = *(void **)base_addr + field->start;
1177             }
1178             for (i = 0; i < n_elems; i++) {
1179                 void *addr = base_addr + size * i;
1180
1181                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1182                     addr = *(void **)addr;
1183                 }
1184                 if (field->flags & VMS_STRUCT) {
1185                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1186                 } else {
1187                     ret = field->info->get(f, addr, size);
1188
1189                 }
1190                 if (ret < 0) {
1191                     return ret;
1192                 }
1193             }
1194         }
1195         field++;
1196     }
1197     if (vmsd->post_load) {
1198         return vmsd->post_load(opaque, version_id);
1199     }
1200     return 0;
1201 }
1202
1203 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1204                         void *opaque)
1205 {
1206     VMStateField *field = vmsd->fields;
1207
1208     if (vmsd->pre_save) {
1209         vmsd->pre_save(opaque);
1210     }
1211     while(field->name) {
1212         if (!field->field_exists ||
1213             field->field_exists(opaque, vmsd->version_id)) {
1214             void *base_addr = opaque + field->offset;
1215             int i, n_elems = 1;
1216             int size = field->size;
1217
1218             if (field->flags & VMS_VBUFFER) {
1219                 size = *(int32_t *)(opaque+field->size_offset);
1220                 if (field->flags & VMS_MULTIPLY) {
1221                     size *= field->size;
1222                 }
1223             }
1224             if (field->flags & VMS_ARRAY) {
1225                 n_elems = field->num;
1226             } else if (field->flags & VMS_VARRAY_INT32) {
1227                 n_elems = *(int32_t *)(opaque+field->num_offset);
1228             } else if (field->flags & VMS_VARRAY_UINT16) {
1229                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1230             }
1231             if (field->flags & VMS_POINTER) {
1232                 base_addr = *(void **)base_addr + field->start;
1233             }
1234             for (i = 0; i < n_elems; i++) {
1235                 void *addr = base_addr + size * i;
1236
1237                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1238                     addr = *(void **)addr;
1239                 }
1240                 if (field->flags & VMS_STRUCT) {
1241                     vmstate_save_state(f, field->vmsd, addr);
1242                 } else {
1243                     field->info->put(f, addr, size);
1244                 }
1245             }
1246         }
1247         field++;
1248     }
1249 }
1250
1251 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1252 {
1253     if (!se->vmsd) {         /* Old style */
1254         return se->load_state(f, se->opaque, version_id);
1255     }
1256     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1257 }
1258
1259 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1260 {
1261     if (!se->vmsd) {         /* Old style */
1262         se->save_state(f, se->opaque);
1263         return;
1264     }
1265     vmstate_save_state(f,se->vmsd, se->opaque);
1266 }
1267
1268 #define QEMU_VM_FILE_MAGIC           0x5145564d
1269 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1270 #define QEMU_VM_FILE_VERSION         0x00000003
1271
1272 #define QEMU_VM_EOF                  0x00
1273 #define QEMU_VM_SECTION_START        0x01
1274 #define QEMU_VM_SECTION_PART         0x02
1275 #define QEMU_VM_SECTION_END          0x03
1276 #define QEMU_VM_SECTION_FULL         0x04
1277
1278 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1279                             int shared)
1280 {
1281     SaveStateEntry *se;
1282
1283     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1284         if(se->set_params == NULL) {
1285             continue;
1286         }
1287         se->set_params(blk_enable, shared, se->opaque);
1288     }
1289
1290     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1291     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1292
1293     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1294         int len;
1295
1296         if (se->save_live_state == NULL)
1297             continue;
1298
1299         /* Section type */
1300         qemu_put_byte(f, QEMU_VM_SECTION_START);
1301         qemu_put_be32(f, se->section_id);
1302
1303         /* ID string */
1304         len = strlen(se->idstr);
1305         qemu_put_byte(f, len);
1306         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1307
1308         qemu_put_be32(f, se->instance_id);
1309         qemu_put_be32(f, se->version_id);
1310
1311         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1312     }
1313
1314     if (qemu_file_has_error(f)) {
1315         qemu_savevm_state_cancel(mon, f);
1316         return -EIO;
1317     }
1318
1319     return 0;
1320 }
1321
1322 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1323 {
1324     SaveStateEntry *se;
1325     int ret = 1;
1326
1327     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1328         if (se->save_live_state == NULL)
1329             continue;
1330
1331         /* Section type */
1332         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1333         qemu_put_be32(f, se->section_id);
1334
1335         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1336         if (!ret) {
1337             /* Do not proceed to the next vmstate before this one reported
1338                completion of the current stage. This serializes the migration
1339                and reduces the probability that a faster changing state is
1340                synchronized over and over again. */
1341             break;
1342         }
1343     }
1344
1345     if (ret)
1346         return 1;
1347
1348     if (qemu_file_has_error(f)) {
1349         qemu_savevm_state_cancel(mon, f);
1350         return -EIO;
1351     }
1352
1353     return 0;
1354 }
1355
1356 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1357 {
1358     SaveStateEntry *se;
1359
1360     cpu_synchronize_all_states();
1361
1362     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1363         if (se->save_live_state == NULL)
1364             continue;
1365
1366         /* Section type */
1367         qemu_put_byte(f, QEMU_VM_SECTION_END);
1368         qemu_put_be32(f, se->section_id);
1369
1370         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1371     }
1372
1373     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1374         int len;
1375
1376         if (se->save_state == NULL && se->vmsd == NULL)
1377             continue;
1378
1379         /* Section type */
1380         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1381         qemu_put_be32(f, se->section_id);
1382
1383         /* ID string */
1384         len = strlen(se->idstr);
1385         qemu_put_byte(f, len);
1386         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1387
1388         qemu_put_be32(f, se->instance_id);
1389         qemu_put_be32(f, se->version_id);
1390
1391         vmstate_save(f, se);
1392     }
1393
1394     qemu_put_byte(f, QEMU_VM_EOF);
1395
1396     if (qemu_file_has_error(f))
1397         return -EIO;
1398
1399     return 0;
1400 }
1401
1402 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1403 {
1404     SaveStateEntry *se;
1405
1406     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1407         if (se->save_live_state) {
1408             se->save_live_state(mon, f, -1, se->opaque);
1409         }
1410     }
1411 }
1412
1413 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1414 {
1415     int saved_vm_running;
1416     int ret;
1417
1418     saved_vm_running = vm_running;
1419     vm_stop(0);
1420
1421     bdrv_flush_all();
1422
1423     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1424     if (ret < 0)
1425         goto out;
1426
1427     do {
1428         ret = qemu_savevm_state_iterate(mon, f);
1429         if (ret < 0)
1430             goto out;
1431     } while (ret == 0);
1432
1433     ret = qemu_savevm_state_complete(mon, f);
1434
1435 out:
1436     if (qemu_file_has_error(f))
1437         ret = -EIO;
1438
1439     if (!ret && saved_vm_running)
1440         vm_start();
1441
1442     return ret;
1443 }
1444
1445 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1446 {
1447     SaveStateEntry *se;
1448
1449     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1450         if (!strcmp(se->idstr, idstr) &&
1451             (instance_id == se->instance_id ||
1452              instance_id == se->alias_id))
1453             return se;
1454     }
1455     return NULL;
1456 }
1457
1458 typedef struct LoadStateEntry {
1459     QLIST_ENTRY(LoadStateEntry) entry;
1460     SaveStateEntry *se;
1461     int section_id;
1462     int version_id;
1463 } LoadStateEntry;
1464
1465 int qemu_loadvm_state(QEMUFile *f)
1466 {
1467     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1468         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1469     LoadStateEntry *le, *new_le;
1470     uint8_t section_type;
1471     unsigned int v;
1472     int ret;
1473
1474     v = qemu_get_be32(f);
1475     if (v != QEMU_VM_FILE_MAGIC)
1476         return -EINVAL;
1477
1478     v = qemu_get_be32(f);
1479     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1480         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1481         return -ENOTSUP;
1482     }
1483     if (v != QEMU_VM_FILE_VERSION)
1484         return -ENOTSUP;
1485
1486     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1487         uint32_t instance_id, version_id, section_id;
1488         SaveStateEntry *se;
1489         char idstr[257];
1490         int len;
1491
1492         switch (section_type) {
1493         case QEMU_VM_SECTION_START:
1494         case QEMU_VM_SECTION_FULL:
1495             /* Read section start */
1496             section_id = qemu_get_be32(f);
1497             len = qemu_get_byte(f);
1498             qemu_get_buffer(f, (uint8_t *)idstr, len);
1499             idstr[len] = 0;
1500             instance_id = qemu_get_be32(f);
1501             version_id = qemu_get_be32(f);
1502
1503             /* Find savevm section */
1504             se = find_se(idstr, instance_id);
1505             if (se == NULL) {
1506                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1507                 ret = -EINVAL;
1508                 goto out;
1509             }
1510
1511             /* Validate version */
1512             if (version_id > se->version_id) {
1513                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1514                         version_id, idstr, se->version_id);
1515                 ret = -EINVAL;
1516                 goto out;
1517             }
1518
1519             /* Add entry */
1520             le = qemu_mallocz(sizeof(*le));
1521
1522             le->se = se;
1523             le->section_id = section_id;
1524             le->version_id = version_id;
1525             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1526
1527             ret = vmstate_load(f, le->se, le->version_id);
1528             if (ret < 0) {
1529                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1530                         instance_id, idstr);
1531                 goto out;
1532             }
1533             break;
1534         case QEMU_VM_SECTION_PART:
1535         case QEMU_VM_SECTION_END:
1536             section_id = qemu_get_be32(f);
1537
1538             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1539                 if (le->section_id == section_id) {
1540                     break;
1541                 }
1542             }
1543             if (le == NULL) {
1544                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1545                 ret = -EINVAL;
1546                 goto out;
1547             }
1548
1549             ret = vmstate_load(f, le->se, le->version_id);
1550             if (ret < 0) {
1551                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1552                         section_id);
1553                 goto out;
1554             }
1555             break;
1556         default:
1557             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1558             ret = -EINVAL;
1559             goto out;
1560         }
1561     }
1562
1563     cpu_synchronize_all_post_init();
1564
1565     ret = 0;
1566
1567 out:
1568     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1569         QLIST_REMOVE(le, entry);
1570         qemu_free(le);
1571     }
1572
1573     if (qemu_file_has_error(f))
1574         ret = -EIO;
1575
1576     return ret;
1577 }
1578
1579 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1580                               const char *name)
1581 {
1582     QEMUSnapshotInfo *sn_tab, *sn;
1583     int nb_sns, i, ret;
1584
1585     ret = -ENOENT;
1586     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1587     if (nb_sns < 0)
1588         return ret;
1589     for(i = 0; i < nb_sns; i++) {
1590         sn = &sn_tab[i];
1591         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1592             *sn_info = *sn;
1593             ret = 0;
1594             break;
1595         }
1596     }
1597     qemu_free(sn_tab);
1598     return ret;
1599 }
1600
1601 /*
1602  * Deletes snapshots of a given name in all opened images.
1603  */
1604 static int del_existing_snapshots(Monitor *mon, const char *name)
1605 {
1606     BlockDriverState *bs;
1607     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1608     int ret;
1609
1610     bs = NULL;
1611     while ((bs = bdrv_next(bs))) {
1612         if (bdrv_can_snapshot(bs) &&
1613             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1614         {
1615             ret = bdrv_snapshot_delete(bs, name);
1616             if (ret < 0) {
1617                 monitor_printf(mon,
1618                                "Error while deleting snapshot on '%s'\n",
1619                                bdrv_get_device_name(bs));
1620                 return -1;
1621             }
1622         }
1623     }
1624
1625     return 0;
1626 }
1627
1628 void do_savevm(Monitor *mon, const QDict *qdict)
1629 {
1630     BlockDriverState *bs, *bs1;
1631     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1632     int ret;
1633     QEMUFile *f;
1634     int saved_vm_running;
1635     uint32_t vm_state_size;
1636 #ifdef _WIN32
1637     struct _timeb tb;
1638 #else
1639     struct timeval tv;
1640 #endif
1641     const char *name = qdict_get_try_str(qdict, "name");
1642
1643     /* Verify if there is a device that doesn't support snapshots and is writable */
1644     bs = NULL;
1645     while ((bs = bdrv_next(bs))) {
1646
1647         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1648             continue;
1649         }
1650
1651         if (!bdrv_can_snapshot(bs)) {
1652             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1653                                bdrv_get_device_name(bs));
1654             return;
1655         }
1656     }
1657
1658     bs = bdrv_snapshots();
1659     if (!bs) {
1660         monitor_printf(mon, "No block device can accept snapshots\n");
1661         return;
1662     }
1663     /* ??? Should this occur after vm_stop?  */
1664     qemu_aio_flush();
1665
1666     saved_vm_running = vm_running;
1667     vm_stop(0);
1668
1669     memset(sn, 0, sizeof(*sn));
1670     if (name) {
1671         ret = bdrv_snapshot_find(bs, old_sn, name);
1672         if (ret >= 0) {
1673             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1674             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1675         } else {
1676             pstrcpy(sn->name, sizeof(sn->name), name);
1677         }
1678     }
1679
1680     /* fill auxiliary fields */
1681 #ifdef _WIN32
1682     _ftime(&tb);
1683     sn->date_sec = tb.time;
1684     sn->date_nsec = tb.millitm * 1000000;
1685 #else
1686     gettimeofday(&tv, NULL);
1687     sn->date_sec = tv.tv_sec;
1688     sn->date_nsec = tv.tv_usec * 1000;
1689 #endif
1690     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1691
1692     /* Delete old snapshots of the same name */
1693     if (name && del_existing_snapshots(mon, name) < 0) {
1694         goto the_end;
1695     }
1696
1697     /* save the VM state */
1698     f = qemu_fopen_bdrv(bs, 1);
1699     if (!f) {
1700         monitor_printf(mon, "Could not open VM state file\n");
1701         goto the_end;
1702     }
1703     ret = qemu_savevm_state(mon, f);
1704     vm_state_size = qemu_ftell(f);
1705     qemu_fclose(f);
1706     if (ret < 0) {
1707         monitor_printf(mon, "Error %d while writing VM\n", ret);
1708         goto the_end;
1709     }
1710
1711     /* create the snapshots */
1712
1713     bs1 = NULL;
1714     while ((bs1 = bdrv_next(bs1))) {
1715         if (bdrv_can_snapshot(bs1)) {
1716             /* Write VM state size only to the image that contains the state */
1717             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1718             ret = bdrv_snapshot_create(bs1, sn);
1719             if (ret < 0) {
1720                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1721                                bdrv_get_device_name(bs1));
1722             }
1723         }
1724     }
1725
1726  the_end:
1727     if (saved_vm_running)
1728         vm_start();
1729 }
1730
1731 int load_vmstate(const char *name)
1732 {
1733     BlockDriverState *bs, *bs1;
1734     QEMUSnapshotInfo sn;
1735     QEMUFile *f;
1736     int ret;
1737
1738     /* Verify if there is a device that doesn't support snapshots and is writable */
1739     bs = NULL;
1740     while ((bs = bdrv_next(bs))) {
1741
1742         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1743             continue;
1744         }
1745
1746         if (!bdrv_can_snapshot(bs)) {
1747             error_report("Device '%s' is writable but does not support snapshots.",
1748                                bdrv_get_device_name(bs));
1749             return -ENOTSUP;
1750         }
1751     }
1752
1753     bs = bdrv_snapshots();
1754     if (!bs) {
1755         error_report("No block device supports snapshots");
1756         return -EINVAL;
1757     }
1758
1759     /* Flush all IO requests so they don't interfere with the new state.  */
1760     qemu_aio_flush();
1761
1762     bs1 = NULL;
1763     while ((bs1 = bdrv_next(bs1))) {
1764         if (bdrv_can_snapshot(bs1)) {
1765             ret = bdrv_snapshot_goto(bs1, name);
1766             if (ret < 0) {
1767                 switch(ret) {
1768                 case -ENOTSUP:
1769                     error_report("%sSnapshots not supported on device '%s'",
1770                                  bs != bs1 ? "Warning: " : "",
1771                                  bdrv_get_device_name(bs1));
1772                     break;
1773                 case -ENOENT:
1774                     error_report("%sCould not find snapshot '%s' on device '%s'",
1775                                  bs != bs1 ? "Warning: " : "",
1776                                  name, bdrv_get_device_name(bs1));
1777                     break;
1778                 default:
1779                     error_report("%sError %d while activating snapshot on '%s'",
1780                                  bs != bs1 ? "Warning: " : "",
1781                                  ret, bdrv_get_device_name(bs1));
1782                     break;
1783                 }
1784                 /* fatal on snapshot block device */
1785                 if (bs == bs1)
1786                     return 0;
1787             }
1788         }
1789     }
1790
1791     /* Don't even try to load empty VM states */
1792     ret = bdrv_snapshot_find(bs, &sn, name);
1793     if ((ret >= 0) && (sn.vm_state_size == 0))
1794         return -EINVAL;
1795
1796     /* restore the VM state */
1797     f = qemu_fopen_bdrv(bs, 0);
1798     if (!f) {
1799         error_report("Could not open VM state file");
1800         return -EINVAL;
1801     }
1802     ret = qemu_loadvm_state(f);
1803     qemu_fclose(f);
1804     if (ret < 0) {
1805         error_report("Error %d while loading VM state", ret);
1806         return ret;
1807     }
1808     return 0;
1809 }
1810
1811 void do_delvm(Monitor *mon, const QDict *qdict)
1812 {
1813     BlockDriverState *bs, *bs1;
1814     int ret;
1815     const char *name = qdict_get_str(qdict, "name");
1816
1817     bs = bdrv_snapshots();
1818     if (!bs) {
1819         monitor_printf(mon, "No block device supports snapshots\n");
1820         return;
1821     }
1822
1823     bs1 = NULL;
1824     while ((bs1 = bdrv_next(bs1))) {
1825         if (bdrv_can_snapshot(bs1)) {
1826             ret = bdrv_snapshot_delete(bs1, name);
1827             if (ret < 0) {
1828                 if (ret == -ENOTSUP)
1829                     monitor_printf(mon,
1830                                    "Snapshots not supported on device '%s'\n",
1831                                    bdrv_get_device_name(bs1));
1832                 else
1833                     monitor_printf(mon, "Error %d while deleting snapshot on "
1834                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1835             }
1836         }
1837     }
1838 }
1839
1840 void do_info_snapshots(Monitor *mon)
1841 {
1842     BlockDriverState *bs, *bs1;
1843     QEMUSnapshotInfo *sn_tab, *sn;
1844     int nb_sns, i;
1845     char buf[256];
1846
1847     bs = bdrv_snapshots();
1848     if (!bs) {
1849         monitor_printf(mon, "No available block device supports snapshots\n");
1850         return;
1851     }
1852     monitor_printf(mon, "Snapshot devices:");
1853     bs1 = NULL;
1854     while ((bs1 = bdrv_next(bs1))) {
1855         if (bdrv_can_snapshot(bs1)) {
1856             if (bs == bs1)
1857                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1858         }
1859     }
1860     monitor_printf(mon, "\n");
1861
1862     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1863     if (nb_sns < 0) {
1864         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1865         return;
1866     }
1867     monitor_printf(mon, "Snapshot list (from %s):\n",
1868                    bdrv_get_device_name(bs));
1869     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1870     for(i = 0; i < nb_sns; i++) {
1871         sn = &sn_tab[i];
1872         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1873     }
1874     qemu_free(sn_tab);
1875 }