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