savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #include <arpa/inet.h>
  46 #include <dirent.h>
  47 #include <netdb.h>
  48 #include <sys/select.h>
  49 #ifdef CONFIG_BSD
  50 #include <sys/stat.h>
  51 #if defined(__FreeBSD__) || defined(__DragonFly__)
  52 #include <libutil.h>
  53 #else
  54 #include <util.h>
  55 #endif
  56 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  57 #include <freebsd/stdlib.h>
  58 #else
  59 #ifdef __linux__
  60 #include <pty.h>
  61 #include <malloc.h>
  62 #include <linux/rtc.h>
  63 #endif
  64 #endif
  65 #endif
  66
  67 #ifdef _WIN32
  68 #include <windows.h>
  69 #include <malloc.h>
  70 #include <sys/timeb.h>
  71 #include <mmsystem.h>
  72 #define getopt_long_only getopt_long
  73 #define memalign(align, size) malloc(size)
  74 #endif
  75
  76 #include "qemu-common.h"
  77 #include "hw/hw.h"
  78 #include "net.h"
  79 #include "monitor.h"
  80 #include "sysemu.h"
  81 #include "qemu-timer.h"
  82 #include "qemu-char.h"
  83 #include "block.h"
  84 #include "audio/audio.h"
  85 #include "migration.h"
  86 #include "qemu_socket.h"
  87 #include "qemu-queue.h"
  88
  89 /* point to the block driver where the snapshots are managed */
  90 static BlockDriverState *bs_snapshots;
  91
  92 #define SELF_ANNOUNCE_ROUNDS 5
  93
  94 #ifndef ETH_P_RARP
  95 #define ETH_P_RARP 0x0835
  96 #endif
  97 #define ARP_HTYPE_ETH 0x0001
  98 #define ARP_PTYPE_IP 0x0800
  99 #define ARP_OP_REQUEST_REV 0x3
 100
 101 static int announce_self_create(uint8_t *buf,
 102                                 uint8_t *mac_addr)
 103 {
 104     /* Ethernet header. */
 105     memset(buf, 0xff, 6);         /* destination MAC addr */
 106     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 107     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 108
 109     /* RARP header. */
 110     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 111     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 112     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 113     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 114     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 115     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 116     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 117     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 118     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 119
 120     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 121     memset(buf + 42, 0x00, 18);
 122
 123     return 60; /* len (FCS will be added by hardware) */
 124 }
 125
 126 static void qemu_announce_self_once(void *opaque)
 127 {
 128     int i, len;
 129     VLANState *vlan;
 130     VLANClientState *vc;
 131     uint8_t buf[60];
 132     static int count = SELF_ANNOUNCE_ROUNDS;
 133     QEMUTimer *timer = *(QEMUTimer **)opaque;
 134
 135     for (i = 0; i < MAX_NICS; i++) {
 136         if (!nd_table[i].used)
 137             continue;
 138         len = announce_self_create(buf, nd_table[i].macaddr);
 139         vlan = nd_table[i].vlan;
 140         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 141             qemu_send_packet_raw(vc, buf, len);
 142         }
 143     }
 144     if (--count) {
 145         /* delay 50ms, 150ms, 250ms, ... */
 146         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 147                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 148     } else {
 149             qemu_del_timer(timer);
 150             qemu_free_timer(timer);
 151     }
 152 }
 153
 154 void qemu_announce_self(void)
 155 {
 156         static QEMUTimer *timer;
 157         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 158         qemu_announce_self_once(&timer);
 159 }
 160
 161 /***********************************************************/
 162 /* savevm/loadvm support */
 163
 164 #define IO_BUF_SIZE 32768
 165
 166 struct QEMUFile {
 167     QEMUFilePutBufferFunc *put_buffer;
 168     QEMUFileGetBufferFunc *get_buffer;
 169     QEMUFileCloseFunc *close;
 170     QEMUFileRateLimit *rate_limit;
 171     QEMUFileSetRateLimit *set_rate_limit;
 172     void *opaque;
 173     int is_write;
 174
 175     int64_t buf_offset; /* start of buffer when writing, end of buffer
 176                            when reading */
 177     int buf_index;
 178     int buf_size; /* 0 when writing */
 179     uint8_t buf[IO_BUF_SIZE];
 180
 181     int has_error;
 182 };
 183
 184 typedef struct QEMUFileStdio
 185 {
 186     FILE *stdio_file;
 187     QEMUFile *file;
 188 } QEMUFileStdio;
 189
 190 typedef struct QEMUFileSocket
 191 {
 192     int fd;
 193     QEMUFile *file;
 194 } QEMUFileSocket;
 195
 196 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 197 {
 198     QEMUFileSocket *s = opaque;
 199     ssize_t len;
 200
 201     do {
 202         len = recv(s->fd, (void *)buf, size, 0);
 203     } while (len == -1 && socket_error() == EINTR);
 204
 205     if (len == -1)
 206         len = -socket_error();
 207
 208     return len;
 209 }
 210
 211 static int socket_close(void *opaque)
 212 {
 213     QEMUFileSocket *s = opaque;
 214     qemu_free(s);
 215     return 0;
 216 }
 217
 218 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 219 {
 220     QEMUFileStdio *s = opaque;
 221     return fwrite(buf, 1, size, s->stdio_file);
 222 }
 223
 224 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 225 {
 226     QEMUFileStdio *s = opaque;
 227     FILE *fp = s->stdio_file;
 228     int bytes;
 229
 230     do {
 231         clearerr(fp);
 232         bytes = fread(buf, 1, size, fp);
 233     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 234     return bytes;
 235 }
 236
 237 static int stdio_pclose(void *opaque)
 238 {
 239     QEMUFileStdio *s = opaque;
 240     pclose(s->stdio_file);
 241     qemu_free(s);
 242     return 0;
 243 }
 244
 245 static int stdio_fclose(void *opaque)
 246 {
 247     QEMUFileStdio *s = opaque;
 248     fclose(s->stdio_file);
 249     qemu_free(s);
 250     return 0;
 251 }
 252
 253 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 254 {
 255     QEMUFileStdio *s;
 256
 257     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 258         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 259         return NULL;
 260     }
 261
 262     s = qemu_mallocz(sizeof(QEMUFileStdio));
 263
 264     s->stdio_file = stdio_file;
 265
 266     if(mode[0] == 'r') {
 267         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
 268     } else {
 269         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 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, NULL, NULL);
 315     } else {
 316         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 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, NULL, NULL);
 331     return s->file;
 332 }
 333
 334 static int file_put_buffer(void *opaque, const uint8_t *buf,
 335                             int64_t pos, int size)
 336 {
 337     QEMUFileStdio *s = opaque;
 338     fseek(s->stdio_file, pos, SEEK_SET);
 339     fwrite(buf, 1, size, s->stdio_file);
 340     return size;
 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_fdopen: 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, NULL, NULL);
 369     } else {
 370         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
 371     }
 372     return s->file;
 373 fail:
 374     qemu_free(s);
 375     return NULL;
 376 }
 377
 378 static int block_put_buffer(void *opaque, const uint8_t *buf,
 379                            int64_t pos, int size)
 380 {
 381     bdrv_save_vmstate(opaque, buf, pos, size);
 382     return size;
 383 }
 384
 385 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 386 {
 387     return bdrv_load_vmstate(opaque, buf, pos, size);
 388 }
 389
 390 static int bdrv_fclose(void *opaque)
 391 {
 392     return 0;
 393 }
 394
 395 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 396 {
 397     if (is_writable)
 398         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
 399     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
 400 }
 401
 402 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 403                          QEMUFileGetBufferFunc *get_buffer,
 404                          QEMUFileCloseFunc *close,
 405                          QEMUFileRateLimit *rate_limit,
 406                          QEMUFileSetRateLimit *set_rate_limit)
 407 {
 408     QEMUFile *f;
 409
 410     f = qemu_mallocz(sizeof(QEMUFile));
 411
 412     f->opaque = opaque;
 413     f->put_buffer = put_buffer;
 414     f->get_buffer = get_buffer;
 415     f->close = close;
 416     f->rate_limit = rate_limit;
 417     f->set_rate_limit = set_rate_limit;
 418     f->is_write = 0;
 419
 420     return f;
 421 }
 422
 423 int qemu_file_has_error(QEMUFile *f)
 424 {
 425     return f->has_error;
 426 }
 427
 428 void qemu_file_set_error(QEMUFile *f)
 429 {
 430     f->has_error = 1;
 431 }
 432
 433 void qemu_fflush(QEMUFile *f)
 434 {
 435     if (!f->put_buffer)
 436         return;
 437
 438     if (f->is_write && f->buf_index > 0) {
 439         int len;
 440
 441         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 442         if (len > 0)
 443             f->buf_offset += f->buf_index;
 444         else
 445             f->has_error = 1;
 446         f->buf_index = 0;
 447     }
 448 }
 449
 450 static void qemu_fill_buffer(QEMUFile *f)
 451 {
 452     int len;
 453
 454     if (!f->get_buffer)
 455         return;
 456
 457     if (f->is_write)
 458         abort();
 459
 460     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 461     if (len > 0) {
 462         f->buf_index = 0;
 463         f->buf_size = len;
 464         f->buf_offset += len;
 465     } else if (len != -EAGAIN)
 466         f->has_error = 1;
 467 }
 468
 469 int qemu_fclose(QEMUFile *f)
 470 {
 471     int ret = 0;
 472     qemu_fflush(f);
 473     if (f->close)
 474         ret = f->close(f->opaque);
 475     qemu_free(f);
 476     return ret;
 477 }
 478
 479 void qemu_file_put_notify(QEMUFile *f)
 480 {
 481     f->put_buffer(f->opaque, NULL, 0, 0);
 482 }
 483
 484 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 485 {
 486     int l;
 487
 488     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 489         fprintf(stderr,
 490                 "Attempted to write to buffer while read buffer is not empty\n");
 491         abort();
 492     }
 493
 494     while (!f->has_error && size > 0) {
 495         l = IO_BUF_SIZE - f->buf_index;
 496         if (l > size)
 497             l = size;
 498         memcpy(f->buf + f->buf_index, buf, l);
 499         f->is_write = 1;
 500         f->buf_index += l;
 501         buf += l;
 502         size -= l;
 503         if (f->buf_index >= IO_BUF_SIZE)
 504             qemu_fflush(f);
 505     }
 506 }
 507
 508 void qemu_put_byte(QEMUFile *f, int v)
 509 {
 510     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 511         fprintf(stderr,
 512                 "Attempted to write to buffer while read buffer is not empty\n");
 513         abort();
 514     }
 515
 516     f->buf[f->buf_index++] = v;
 517     f->is_write = 1;
 518     if (f->buf_index >= IO_BUF_SIZE)
 519         qemu_fflush(f);
 520 }
 521
 522 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 523 {
 524     int size, l;
 525
 526     if (f->is_write)
 527         abort();
 528
 529     size = size1;
 530     while (size > 0) {
 531         l = f->buf_size - f->buf_index;
 532         if (l == 0) {
 533             qemu_fill_buffer(f);
 534             l = f->buf_size - f->buf_index;
 535             if (l == 0)
 536                 break;
 537         }
 538         if (l > size)
 539             l = size;
 540         memcpy(buf, f->buf + f->buf_index, l);
 541         f->buf_index += l;
 542         buf += l;
 543         size -= l;
 544     }
 545     return size1 - size;
 546 }
 547
 548 int qemu_get_byte(QEMUFile *f)
 549 {
 550     if (f->is_write)
 551         abort();
 552
 553     if (f->buf_index >= f->buf_size) {
 554         qemu_fill_buffer(f);
 555         if (f->buf_index >= f->buf_size)
 556             return 0;
 557     }
 558     return f->buf[f->buf_index++];
 559 }
 560
 561 int64_t qemu_ftell(QEMUFile *f)
 562 {
 563     return f->buf_offset - f->buf_size + f->buf_index;
 564 }
 565
 566 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 567 {
 568     if (whence == SEEK_SET) {
 569         /* nothing to do */
 570     } else if (whence == SEEK_CUR) {
 571         pos += qemu_ftell(f);
 572     } else {
 573         /* SEEK_END not supported */
 574         return -1;
 575     }
 576     if (f->put_buffer) {
 577         qemu_fflush(f);
 578         f->buf_offset = pos;
 579     } else {
 580         f->buf_offset = pos;
 581         f->buf_index = 0;
 582         f->buf_size = 0;
 583     }
 584     return pos;
 585 }
 586
 587 int qemu_file_rate_limit(QEMUFile *f)
 588 {
 589     if (f->rate_limit)
 590         return f->rate_limit(f->opaque);
 591
 592     return 0;
 593 }
 594
 595 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 596 {
 597     /* any failed or completed migration keeps its state to allow probing of
 598      * migration data, but has no associated file anymore */
 599     if (f && f->set_rate_limit)
 600         return f->set_rate_limit(f->opaque, new_rate);
 601
 602     return 0;
 603 }
 604
 605 void qemu_put_be16(QEMUFile *f, unsigned int v)
 606 {
 607     qemu_put_byte(f, v >> 8);
 608     qemu_put_byte(f, v);
 609 }
 610
 611 void qemu_put_be32(QEMUFile *f, unsigned int v)
 612 {
 613     qemu_put_byte(f, v >> 24);
 614     qemu_put_byte(f, v >> 16);
 615     qemu_put_byte(f, v >> 8);
 616     qemu_put_byte(f, v);
 617 }
 618
 619 void qemu_put_be64(QEMUFile *f, uint64_t v)
 620 {
 621     qemu_put_be32(f, v >> 32);
 622     qemu_put_be32(f, v);
 623 }
 624
 625 unsigned int qemu_get_be16(QEMUFile *f)
 626 {
 627     unsigned int v;
 628     v = qemu_get_byte(f) << 8;
 629     v |= qemu_get_byte(f);
 630     return v;
 631 }
 632
 633 unsigned int qemu_get_be32(QEMUFile *f)
 634 {
 635     unsigned int v;
 636     v = qemu_get_byte(f) << 24;
 637     v |= qemu_get_byte(f) << 16;
 638     v |= qemu_get_byte(f) << 8;
 639     v |= qemu_get_byte(f);
 640     return v;
 641 }
 642
 643 uint64_t qemu_get_be64(QEMUFile *f)
 644 {
 645     uint64_t v;
 646     v = (uint64_t)qemu_get_be32(f) << 32;
 647     v |= qemu_get_be32(f);
 648     return v;
 649 }
 650
 651 /* 8 bit int */
 652
 653 static int get_int8(QEMUFile *f, void *pv, size_t size)
 654 {
 655     int8_t *v = pv;
 656     qemu_get_s8s(f, v);
 657     return 0;
 658 }
 659
 660 static void put_int8(QEMUFile *f, void *pv, size_t size)
 661 {
 662     int8_t *v = pv;
 663     qemu_put_s8s(f, v);
 664 }
 665
 666 const VMStateInfo vmstate_info_int8 = {
 667     .name = "int8",
 668     .get  = get_int8,
 669     .put  = put_int8,
 670 };
 671
 672 /* 16 bit int */
 673
 674 static int get_int16(QEMUFile *f, void *pv, size_t size)
 675 {
 676     int16_t *v = pv;
 677     qemu_get_sbe16s(f, v);
 678     return 0;
 679 }
 680
 681 static void put_int16(QEMUFile *f, void *pv, size_t size)
 682 {
 683     int16_t *v = pv;
 684     qemu_put_sbe16s(f, v);
 685 }
 686
 687 const VMStateInfo vmstate_info_int16 = {
 688     .name = "int16",
 689     .get  = get_int16,
 690     .put  = put_int16,
 691 };
 692
 693 /* 32 bit int */
 694
 695 static int get_int32(QEMUFile *f, void *pv, size_t size)
 696 {
 697     int32_t *v = pv;
 698     qemu_get_sbe32s(f, v);
 699     return 0;
 700 }
 701
 702 static void put_int32(QEMUFile *f, void *pv, size_t size)
 703 {
 704     int32_t *v = pv;
 705     qemu_put_sbe32s(f, v);
 706 }
 707
 708 const VMStateInfo vmstate_info_int32 = {
 709     .name = "int32",
 710     .get  = get_int32,
 711     .put  = put_int32,
 712 };
 713
 714 /* 32 bit int. See that the received value is the same than the one
 715    in the field */
 716
 717 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 718 {
 719     int32_t *v = pv;
 720     int32_t v2;
 721     qemu_get_sbe32s(f, &v2);
 722
 723     if (*v == v2)
 724         return 0;
 725     return -EINVAL;
 726 }
 727
 728 const VMStateInfo vmstate_info_int32_equal = {
 729     .name = "int32 equal",
 730     .get  = get_int32_equal,
 731     .put  = put_int32,
 732 };
 733
 734 /* 32 bit int. See that the received value is the less or the same
 735    than the one in the field */
 736
 737 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 738 {
 739     int32_t *old = pv;
 740     int32_t new;
 741     qemu_get_sbe32s(f, &new);
 742
 743     if (*old <= new)
 744         return 0;
 745     return -EINVAL;
 746 }
 747
 748 const VMStateInfo vmstate_info_int32_le = {
 749     .name = "int32 equal",
 750     .get  = get_int32_le,
 751     .put  = put_int32,
 752 };
 753
 754 /* 64 bit int */
 755
 756 static int get_int64(QEMUFile *f, void *pv, size_t size)
 757 {
 758     int64_t *v = pv;
 759     qemu_get_sbe64s(f, v);
 760     return 0;
 761 }
 762
 763 static void put_int64(QEMUFile *f, void *pv, size_t size)
 764 {
 765     int64_t *v = pv;
 766     qemu_put_sbe64s(f, v);
 767 }
 768
 769 const VMStateInfo vmstate_info_int64 = {
 770     .name = "int64",
 771     .get  = get_int64,
 772     .put  = put_int64,
 773 };
 774
 775 /* 8 bit unsigned int */
 776
 777 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 778 {
 779     uint8_t *v = pv;
 780     qemu_get_8s(f, v);
 781     return 0;
 782 }
 783
 784 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 785 {
 786     uint8_t *v = pv;
 787     qemu_put_8s(f, v);
 788 }
 789
 790 const VMStateInfo vmstate_info_uint8 = {
 791     .name = "uint8",
 792     .get  = get_uint8,
 793     .put  = put_uint8,
 794 };
 795
 796 /* 16 bit unsigned int */
 797
 798 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 799 {
 800     uint16_t *v = pv;
 801     qemu_get_be16s(f, v);
 802     return 0;
 803 }
 804
 805 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 806 {
 807     uint16_t *v = pv;
 808     qemu_put_be16s(f, v);
 809 }
 810
 811 const VMStateInfo vmstate_info_uint16 = {
 812     .name = "uint16",
 813     .get  = get_uint16,
 814     .put  = put_uint16,
 815 };
 816
 817 /* 32 bit unsigned int */
 818
 819 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 820 {
 821     uint32_t *v = pv;
 822     qemu_get_be32s(f, v);
 823     return 0;
 824 }
 825
 826 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 827 {
 828     uint32_t *v = pv;
 829     qemu_put_be32s(f, v);
 830 }
 831
 832 const VMStateInfo vmstate_info_uint32 = {
 833     .name = "uint32",
 834     .get  = get_uint32,
 835     .put  = put_uint32,
 836 };
 837
 838 /* 64 bit unsigned int */
 839
 840 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 841 {
 842     uint64_t *v = pv;
 843     qemu_get_be64s(f, v);
 844     return 0;
 845 }
 846
 847 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 848 {
 849     uint64_t *v = pv;
 850     qemu_put_be64s(f, v);
 851 }
 852
 853 const VMStateInfo vmstate_info_uint64 = {
 854     .name = "uint64",
 855     .get  = get_uint64,
 856     .put  = put_uint64,
 857 };
 858
 859 /* 64 bit linux kernel unsigned int */
 860
 861 #ifdef __linux__
 862 static int get_u64(QEMUFile *f, void *pv, size_t size)
 863 {
 864     __u64 *v = pv;
 865     qemu_get_be64s(f, (uint64_t *)v);
 866     return 0;
 867 }
 868
 869 static void put_u64(QEMUFile *f, void *pv, size_t size)
 870 {
 871     __u64 *v = pv;
 872     qemu_put_be64s(f, (uint64_t *)v);
 873 }
 874
 875 const VMStateInfo vmstate_info_u64 = {
 876     .name = "__u64",
 877     .get  = get_u64,
 878     .put  = put_u64,
 879 };
 880 #endif /* __linux__ */
 881
 882 /* 8 bit int. See that the received value is the same than the one
 883    in the field */
 884
 885 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 886 {
 887     uint8_t *v = pv;
 888     uint8_t v2;
 889     qemu_get_8s(f, &v2);
 890
 891     if (*v == v2)
 892         return 0;
 893     return -EINVAL;
 894 }
 895
 896 const VMStateInfo vmstate_info_uint8_equal = {
 897     .name = "uint8 equal",
 898     .get  = get_uint8_equal,
 899     .put  = put_uint8,
 900 };
 901
 902 /* 16 bit unsigned int int. See that the received value is the same than the one
 903    in the field */
 904
 905 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 906 {
 907     uint16_t *v = pv;
 908     uint16_t v2;
 909     qemu_get_be16s(f, &v2);
 910
 911     if (*v == v2)
 912         return 0;
 913     return -EINVAL;
 914 }
 915
 916 const VMStateInfo vmstate_info_uint16_equal = {
 917     .name = "uint16 equal",
 918     .get  = get_uint16_equal,
 919     .put  = put_uint16,
 920 };
 921
 922 /* timers  */
 923
 924 static int get_timer(QEMUFile *f, void *pv, size_t size)
 925 {
 926     QEMUTimer *v = pv;
 927     qemu_get_timer(f, v);
 928     return 0;
 929 }
 930
 931 static void put_timer(QEMUFile *f, void *pv, size_t size)
 932 {
 933     QEMUTimer *v = pv;
 934     qemu_put_timer(f, v);
 935 }
 936
 937 const VMStateInfo vmstate_info_timer = {
 938     .name = "timer",
 939     .get  = get_timer,
 940     .put  = put_timer,
 941 };
 942
 943 /* uint8_t buffers */
 944
 945 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 946 {
 947     uint8_t *v = pv;
 948     qemu_get_buffer(f, v, size);
 949     return 0;
 950 }
 951
 952 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 953 {
 954     uint8_t *v = pv;
 955     qemu_put_buffer(f, v, size);
 956 }
 957
 958 const VMStateInfo vmstate_info_buffer = {
 959     .name = "buffer",
 960     .get  = get_buffer,
 961     .put  = put_buffer,
 962 };
 963
 964 /* unused buffers: space that was used for some fields that are
 965    not usefull anymore */
 966
 967 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 968 {
 969     qemu_fseek(f, size, SEEK_CUR);
 970     return 0;
 971 }
 972
 973 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 974 {
 975     qemu_fseek(f, size, SEEK_CUR);
 976 }
 977
 978 const VMStateInfo vmstate_info_unused_buffer = {
 979     .name = "unused_buffer",
 980     .get  = get_unused_buffer,
 981     .put  = put_unused_buffer,
 982 };
 983
 984 typedef struct SaveStateEntry {
 985     QTAILQ_ENTRY(SaveStateEntry) entry;
 986     char idstr[256];
 987     int instance_id;
 988     int version_id;
 989     int section_id;
 990     SaveLiveStateHandler *save_live_state;
 991     SaveStateHandler *save_state;
 992     LoadStateHandler *load_state;
 993     const VMStateDescription *vmsd;
 994     void *opaque;
 995 } SaveStateEntry;
 996
 997 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
 998     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
 999 static int global_section_id;
1000
1001 static int calculate_new_instance_id(const char *idstr)
1002 {
1003     SaveStateEntry *se;
1004     int instance_id = 0;
1005
1006     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1007         if (strcmp(idstr, se->idstr) == 0
1008             && instance_id <= se->instance_id) {
1009             instance_id = se->instance_id + 1;
1010         }
1011     }
1012     return instance_id;
1013 }
1014
1015 /* TODO: Individual devices generally have very little idea about the rest
1016    of the system, so instance_id should be removed/replaced.
1017    Meanwhile pass -1 as instance_id if you do not already have a clearly
1018    distinguishing id for all instances of your device class. */
1019 int register_savevm_live(const char *idstr,
1020                          int instance_id,
1021                          int version_id,
1022                          SaveLiveStateHandler *save_live_state,
1023                          SaveStateHandler *save_state,
1024                          LoadStateHandler *load_state,
1025                          void *opaque)
1026 {
1027     SaveStateEntry *se;
1028
1029     se = qemu_malloc(sizeof(SaveStateEntry));
1030     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1031     se->version_id = version_id;
1032     se->section_id = global_section_id++;
1033     se->save_live_state = save_live_state;
1034     se->save_state = save_state;
1035     se->load_state = load_state;
1036     se->opaque = opaque;
1037     se->vmsd = NULL;
1038
1039     if (instance_id == -1) {
1040         se->instance_id = calculate_new_instance_id(idstr);
1041     } else {
1042         se->instance_id = instance_id;
1043     }
1044     /* add at the end of list */
1045     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1046     return 0;
1047 }
1048
1049 int register_savevm(const char *idstr,
1050                     int instance_id,
1051                     int version_id,
1052                     SaveStateHandler *save_state,
1053                     LoadStateHandler *load_state,
1054                     void *opaque)
1055 {
1056     return register_savevm_live(idstr, instance_id, version_id,
1057                                 NULL, save_state, load_state, opaque);
1058 }
1059
1060 void unregister_savevm(const char *idstr, void *opaque)
1061 {
1062     SaveStateEntry *se, *new_se;
1063
1064     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1065         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1066             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1067             qemu_free(se);
1068         }
1069     }
1070 }
1071
1072 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1073                      void *opaque)
1074 {
1075     SaveStateEntry *se;
1076
1077     se = qemu_malloc(sizeof(SaveStateEntry));
1078     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1079     se->version_id = vmsd->version_id;
1080     se->section_id = global_section_id++;
1081     se->save_live_state = NULL;
1082     se->save_state = NULL;
1083     se->load_state = NULL;
1084     se->opaque = opaque;
1085     se->vmsd = vmsd;
1086
1087     if (instance_id == -1) {
1088         se->instance_id = calculate_new_instance_id(vmsd->name);
1089     } else {
1090         se->instance_id = instance_id;
1091     }
1092     /* add at the end of list */
1093     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1094     return 0;
1095 }
1096
1097 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1098 {
1099     SaveStateEntry *se, *new_se;
1100
1101     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1102         if (se->vmsd == vmsd && se->opaque == opaque) {
1103             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1104             qemu_free(se);
1105         }
1106     }
1107 }
1108
1109 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1110                        void *opaque, int version_id)
1111 {
1112     VMStateField *field = vmsd->fields;
1113
1114     if (version_id > vmsd->version_id) {
1115         return -EINVAL;
1116     }
1117     if (version_id < vmsd->minimum_version_id_old) {
1118         return -EINVAL;
1119     }
1120     if  (version_id < vmsd->minimum_version_id) {
1121         return vmsd->load_state_old(f, opaque, version_id);
1122     }
1123     if (vmsd->pre_load) {
1124         int ret = vmsd->pre_load(opaque);
1125         if (ret)
1126             return ret;
1127     }
1128     while(field->name) {
1129         if ((field->field_exists &&
1130              field->field_exists(opaque, version_id)) ||
1131             (!field->field_exists &&
1132              field->version_id <= version_id)) {
1133             void *base_addr = opaque + field->offset;
1134             int ret, i, n_elems = 1;
1135
1136             if (field->flags & VMS_ARRAY) {
1137                 n_elems = field->num;
1138             } else if (field->flags & VMS_VARRAY_INT32) {
1139                 n_elems = *(int32_t *)(opaque+field->num_offset);
1140             } else if (field->flags & VMS_VARRAY_UINT16) {
1141                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1142             }
1143             if (field->flags & VMS_POINTER) {
1144                 base_addr = *(void **)base_addr;
1145             }
1146             for (i = 0; i < n_elems; i++) {
1147                 void *addr = base_addr + field->size * i;
1148
1149                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1150                     addr = *(void **)addr;
1151                 }
1152                 if (field->flags & VMS_STRUCT) {
1153                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1154                 } else {
1155                     ret = field->info->get(f, addr, field->size);
1156
1157                 }
1158                 if (ret < 0) {
1159                     return ret;
1160                 }
1161             }
1162         }
1163         field++;
1164     }
1165     if (vmsd->post_load) {
1166         return vmsd->post_load(opaque, version_id);
1167     }
1168     return 0;
1169 }
1170
1171 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1172                         void *opaque)
1173 {
1174     VMStateField *field = vmsd->fields;
1175
1176     if (vmsd->pre_save) {
1177         vmsd->pre_save(opaque);
1178     }
1179     while(field->name) {
1180         if (!field->field_exists ||
1181             field->field_exists(opaque, vmsd->version_id)) {
1182             void *base_addr = opaque + field->offset;
1183             int i, n_elems = 1;
1184
1185             if (field->flags & VMS_ARRAY) {
1186                 n_elems = field->num;
1187             } else if (field->flags & VMS_VARRAY_INT32) {
1188                 n_elems = *(int32_t *)(opaque+field->num_offset);
1189             } else if (field->flags & VMS_VARRAY_UINT16) {
1190                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1191             }
1192             if (field->flags & VMS_POINTER) {
1193                 base_addr = *(void **)base_addr;
1194             }
1195             for (i = 0; i < n_elems; i++) {
1196                 void *addr = base_addr + field->size * i;
1197
1198                 if (field->flags & VMS_STRUCT) {
1199                     vmstate_save_state(f, field->vmsd, addr);
1200                 } else {
1201                     field->info->put(f, addr, field->size);
1202                 }
1203             }
1204         }
1205         field++;
1206     }
1207     if (vmsd->post_save) {
1208         vmsd->post_save(opaque);
1209     }
1210 }
1211
1212 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1213 {
1214     if (!se->vmsd) {         /* Old style */
1215         return se->load_state(f, se->opaque, version_id);
1216     }
1217     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1218 }
1219
1220 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1221 {
1222     if (!se->vmsd) {         /* Old style */
1223         se->save_state(f, se->opaque);
1224         return;
1225     }
1226     vmstate_save_state(f,se->vmsd, se->opaque);
1227 }
1228
1229 #define QEMU_VM_FILE_MAGIC           0x5145564d
1230 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1231 #define QEMU_VM_FILE_VERSION         0x00000003
1232
1233 #define QEMU_VM_EOF                  0x00
1234 #define QEMU_VM_SECTION_START        0x01
1235 #define QEMU_VM_SECTION_PART         0x02
1236 #define QEMU_VM_SECTION_END          0x03
1237 #define QEMU_VM_SECTION_FULL         0x04
1238
1239 int qemu_savevm_state_begin(QEMUFile *f)
1240 {
1241     SaveStateEntry *se;
1242
1243     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1244     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1245
1246     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1247         int len;
1248
1249         if (se->save_live_state == NULL)
1250             continue;
1251
1252         /* Section type */
1253         qemu_put_byte(f, QEMU_VM_SECTION_START);
1254         qemu_put_be32(f, se->section_id);
1255
1256         /* ID string */
1257         len = strlen(se->idstr);
1258         qemu_put_byte(f, len);
1259         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1260
1261         qemu_put_be32(f, se->instance_id);
1262         qemu_put_be32(f, se->version_id);
1263
1264         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1265     }
1266
1267     if (qemu_file_has_error(f))
1268         return -EIO;
1269
1270     return 0;
1271 }
1272
1273 int qemu_savevm_state_iterate(QEMUFile *f)
1274 {
1275     SaveStateEntry *se;
1276     int ret = 1;
1277
1278     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1279         if (se->save_live_state == NULL)
1280             continue;
1281
1282         /* Section type */
1283         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1284         qemu_put_be32(f, se->section_id);
1285
1286         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1287     }
1288
1289     if (ret)
1290         return 1;
1291
1292     if (qemu_file_has_error(f))
1293         return -EIO;
1294
1295     return 0;
1296 }
1297
1298 int qemu_savevm_state_complete(QEMUFile *f)
1299 {
1300     SaveStateEntry *se;
1301
1302     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1303         if (se->save_live_state == NULL)
1304             continue;
1305
1306         /* Section type */
1307         qemu_put_byte(f, QEMU_VM_SECTION_END);
1308         qemu_put_be32(f, se->section_id);
1309
1310         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1311     }
1312
1313     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1314         int len;
1315
1316         if (se->save_state == NULL && se->vmsd == NULL)
1317             continue;
1318
1319         /* Section type */
1320         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1321         qemu_put_be32(f, se->section_id);
1322
1323         /* ID string */
1324         len = strlen(se->idstr);
1325         qemu_put_byte(f, len);
1326         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1327
1328         qemu_put_be32(f, se->instance_id);
1329         qemu_put_be32(f, se->version_id);
1330
1331         vmstate_save(f, se);
1332     }
1333
1334     qemu_put_byte(f, QEMU_VM_EOF);
1335
1336     if (qemu_file_has_error(f))
1337         return -EIO;
1338
1339     return 0;
1340 }
1341
1342 int qemu_savevm_state(QEMUFile *f)
1343 {
1344     int saved_vm_running;
1345     int ret;
1346
1347     saved_vm_running = vm_running;
1348     vm_stop(0);
1349
1350     bdrv_flush_all();
1351
1352     ret = qemu_savevm_state_begin(f);
1353     if (ret < 0)
1354         goto out;
1355
1356     do {
1357         ret = qemu_savevm_state_iterate(f);
1358         if (ret < 0)
1359             goto out;
1360     } while (ret == 0);
1361
1362     ret = qemu_savevm_state_complete(f);
1363
1364 out:
1365     if (qemu_file_has_error(f))
1366         ret = -EIO;
1367
1368     if (!ret && saved_vm_running)
1369         vm_start();
1370
1371     return ret;
1372 }
1373
1374 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1375 {
1376     SaveStateEntry *se;
1377
1378     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1379         if (!strcmp(se->idstr, idstr) &&
1380             instance_id == se->instance_id)
1381             return se;
1382     }
1383     return NULL;
1384 }
1385
1386 typedef struct LoadStateEntry {
1387     QLIST_ENTRY(LoadStateEntry) entry;
1388     SaveStateEntry *se;
1389     int section_id;
1390     int version_id;
1391 } LoadStateEntry;
1392
1393 int qemu_loadvm_state(QEMUFile *f)
1394 {
1395     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1396         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1397     LoadStateEntry *le, *new_le;
1398     uint8_t section_type;
1399     unsigned int v;
1400     int ret;
1401
1402     v = qemu_get_be32(f);
1403     if (v != QEMU_VM_FILE_MAGIC)
1404         return -EINVAL;
1405
1406     v = qemu_get_be32(f);
1407     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1408         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1409         return -ENOTSUP;
1410     }
1411     if (v != QEMU_VM_FILE_VERSION)
1412         return -ENOTSUP;
1413
1414     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1415         uint32_t instance_id, version_id, section_id;
1416         SaveStateEntry *se;
1417         char idstr[257];
1418         int len;
1419
1420         switch (section_type) {
1421         case QEMU_VM_SECTION_START:
1422         case QEMU_VM_SECTION_FULL:
1423             /* Read section start */
1424             section_id = qemu_get_be32(f);
1425             len = qemu_get_byte(f);
1426             qemu_get_buffer(f, (uint8_t *)idstr, len);
1427             idstr[len] = 0;
1428             instance_id = qemu_get_be32(f);
1429             version_id = qemu_get_be32(f);
1430
1431             /* Find savevm section */
1432             se = find_se(idstr, instance_id);
1433             if (se == NULL) {
1434                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1435                 ret = -EINVAL;
1436                 goto out;
1437             }
1438
1439             /* Validate version */
1440             if (version_id > se->version_id) {
1441                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1442                         version_id, idstr, se->version_id);
1443                 ret = -EINVAL;
1444                 goto out;
1445             }
1446
1447             /* Add entry */
1448             le = qemu_mallocz(sizeof(*le));
1449
1450             le->se = se;
1451             le->section_id = section_id;
1452             le->version_id = version_id;
1453             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1454
1455             ret = vmstate_load(f, le->se, le->version_id);
1456             if (ret < 0) {
1457                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1458                         instance_id, idstr);
1459                 goto out;
1460             }
1461             break;
1462         case QEMU_VM_SECTION_PART:
1463         case QEMU_VM_SECTION_END:
1464             section_id = qemu_get_be32(f);
1465
1466             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1467                 if (le->section_id == section_id) {
1468                     break;
1469                 }
1470             }
1471             if (le == NULL) {
1472                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1473                 ret = -EINVAL;
1474                 goto out;
1475             }
1476
1477             ret = vmstate_load(f, le->se, le->version_id);
1478             if (ret < 0) {
1479                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1480                         section_id);
1481                 goto out;
1482             }
1483             break;
1484         default:
1485             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1486             ret = -EINVAL;
1487             goto out;
1488         }
1489     }
1490
1491     ret = 0;
1492
1493 out:
1494     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1495         QLIST_REMOVE(le, entry);
1496         qemu_free(le);
1497     }
1498
1499     if (qemu_file_has_error(f))
1500         ret = -EIO;
1501
1502     return ret;
1503 }
1504
1505 /* device can contain snapshots */
1506 static int bdrv_can_snapshot(BlockDriverState *bs)
1507 {
1508     return (bs &&
1509             !bdrv_is_removable(bs) &&
1510             !bdrv_is_read_only(bs));
1511 }
1512
1513 /* device must be snapshots in order to have a reliable snapshot */
1514 static int bdrv_has_snapshot(BlockDriverState *bs)
1515 {
1516     return (bs &&
1517             !bdrv_is_removable(bs) &&
1518             !bdrv_is_read_only(bs));
1519 }
1520
1521 static BlockDriverState *get_bs_snapshots(void)
1522 {
1523     BlockDriverState *bs;
1524     DriveInfo *dinfo;
1525
1526     if (bs_snapshots)
1527         return bs_snapshots;
1528     QTAILQ_FOREACH(dinfo, &drives, next) {
1529         bs = dinfo->bdrv;
1530         if (bdrv_can_snapshot(bs))
1531             goto ok;
1532     }
1533     return NULL;
1534  ok:
1535     bs_snapshots = bs;
1536     return bs;
1537 }
1538
1539 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1540                               const char *name)
1541 {
1542     QEMUSnapshotInfo *sn_tab, *sn;
1543     int nb_sns, i, ret;
1544
1545     ret = -ENOENT;
1546     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1547     if (nb_sns < 0)
1548         return ret;
1549     for(i = 0; i < nb_sns; i++) {
1550         sn = &sn_tab[i];
1551         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1552             *sn_info = *sn;
1553             ret = 0;
1554             break;
1555         }
1556     }
1557     qemu_free(sn_tab);
1558     return ret;
1559 }
1560
1561 void do_savevm(Monitor *mon, const QDict *qdict)
1562 {
1563     DriveInfo *dinfo;
1564     BlockDriverState *bs, *bs1;
1565     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1566     int must_delete, ret;
1567     QEMUFile *f;
1568     int saved_vm_running;
1569     uint32_t vm_state_size;
1570 #ifdef _WIN32
1571     struct _timeb tb;
1572 #else
1573     struct timeval tv;
1574 #endif
1575     const char *name = qdict_get_try_str(qdict, "name");
1576
1577     bs = get_bs_snapshots();
1578     if (!bs) {
1579         monitor_printf(mon, "No block device can accept snapshots\n");
1580         return;
1581     }
1582
1583     /* ??? Should this occur after vm_stop?  */
1584     qemu_aio_flush();
1585
1586     saved_vm_running = vm_running;
1587     vm_stop(0);
1588
1589     must_delete = 0;
1590     if (name) {
1591         ret = bdrv_snapshot_find(bs, old_sn, name);
1592         if (ret >= 0) {
1593             must_delete = 1;
1594         }
1595     }
1596     memset(sn, 0, sizeof(*sn));
1597     if (must_delete) {
1598         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1599         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1600     } else {
1601         if (name)
1602             pstrcpy(sn->name, sizeof(sn->name), name);
1603     }
1604
1605     /* fill auxiliary fields */
1606 #ifdef _WIN32
1607     _ftime(&tb);
1608     sn->date_sec = tb.time;
1609     sn->date_nsec = tb.millitm * 1000000;
1610 #else
1611     gettimeofday(&tv, NULL);
1612     sn->date_sec = tv.tv_sec;
1613     sn->date_nsec = tv.tv_usec * 1000;
1614 #endif
1615     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1616
1617     /* save the VM state */
1618     f = qemu_fopen_bdrv(bs, 1);
1619     if (!f) {
1620         monitor_printf(mon, "Could not open VM state file\n");
1621         goto the_end;
1622     }
1623     ret = qemu_savevm_state(f);
1624     vm_state_size = qemu_ftell(f);
1625     qemu_fclose(f);
1626     if (ret < 0) {
1627         monitor_printf(mon, "Error %d while writing VM\n", ret);
1628         goto the_end;
1629     }
1630
1631     /* create the snapshots */
1632
1633     QTAILQ_FOREACH(dinfo, &drives, next) {
1634         bs1 = dinfo->bdrv;
1635         if (bdrv_has_snapshot(bs1)) {
1636             if (must_delete) {
1637                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1638                 if (ret < 0) {
1639                     monitor_printf(mon,
1640                                    "Error while deleting snapshot on '%s'\n",
1641                                    bdrv_get_device_name(bs1));
1642                 }
1643             }
1644             /* Write VM state size only to the image that contains the state */
1645             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1646             ret = bdrv_snapshot_create(bs1, sn);
1647             if (ret < 0) {
1648                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1649                                bdrv_get_device_name(bs1));
1650             }
1651         }
1652     }
1653
1654  the_end:
1655     if (saved_vm_running)
1656         vm_start();
1657 }
1658
1659 int load_vmstate(Monitor *mon, const char *name)
1660 {
1661     DriveInfo *dinfo;
1662     BlockDriverState *bs, *bs1;
1663     QEMUSnapshotInfo sn;
1664     QEMUFile *f;
1665     int ret;
1666
1667     bs = get_bs_snapshots();
1668     if (!bs) {
1669         monitor_printf(mon, "No block device supports snapshots\n");
1670         return -EINVAL;
1671     }
1672
1673     /* Flush all IO requests so they don't interfere with the new state.  */
1674     qemu_aio_flush();
1675
1676     QTAILQ_FOREACH(dinfo, &drives, next) {
1677         bs1 = dinfo->bdrv;
1678         if (bdrv_has_snapshot(bs1)) {
1679             ret = bdrv_snapshot_goto(bs1, name);
1680             if (ret < 0) {
1681                 if (bs != bs1)
1682                     monitor_printf(mon, "Warning: ");
1683                 switch(ret) {
1684                 case -ENOTSUP:
1685                     monitor_printf(mon,
1686                                    "Snapshots not supported on device '%s'\n",
1687                                    bdrv_get_device_name(bs1));
1688                     break;
1689                 case -ENOENT:
1690                     monitor_printf(mon, "Could not find snapshot '%s' on "
1691                                    "device '%s'\n",
1692                                    name, bdrv_get_device_name(bs1));
1693                     break;
1694                 default:
1695                     monitor_printf(mon, "Error %d while activating snapshot on"
1696                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1697                     break;
1698                 }
1699                 /* fatal on snapshot block device */
1700                 if (bs == bs1)
1701                     return 0;
1702             }
1703         }
1704     }
1705
1706     /* Don't even try to load empty VM states */
1707     ret = bdrv_snapshot_find(bs, &sn, name);
1708     if ((ret >= 0) && (sn.vm_state_size == 0))
1709         return -EINVAL;
1710
1711     /* restore the VM state */
1712     f = qemu_fopen_bdrv(bs, 0);
1713     if (!f) {
1714         monitor_printf(mon, "Could not open VM state file\n");
1715         return -EINVAL;
1716     }
1717     ret = qemu_loadvm_state(f);
1718     qemu_fclose(f);
1719     if (ret < 0) {
1720         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1721         return ret;
1722     }
1723     return 0;
1724 }
1725
1726 void do_delvm(Monitor *mon, const QDict *qdict)
1727 {
1728     DriveInfo *dinfo;
1729     BlockDriverState *bs, *bs1;
1730     int ret;
1731     const char *name = qdict_get_str(qdict, "name");
1732
1733     bs = get_bs_snapshots();
1734     if (!bs) {
1735         monitor_printf(mon, "No block device supports snapshots\n");
1736         return;
1737     }
1738
1739     QTAILQ_FOREACH(dinfo, &drives, next) {
1740         bs1 = dinfo->bdrv;
1741         if (bdrv_has_snapshot(bs1)) {
1742             ret = bdrv_snapshot_delete(bs1, name);
1743             if (ret < 0) {
1744                 if (ret == -ENOTSUP)
1745                     monitor_printf(mon,
1746                                    "Snapshots not supported on device '%s'\n",
1747                                    bdrv_get_device_name(bs1));
1748                 else
1749                     monitor_printf(mon, "Error %d while deleting snapshot on "
1750                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1751             }
1752         }
1753     }
1754 }
1755
1756 void do_info_snapshots(Monitor *mon)
1757 {
1758     DriveInfo *dinfo;
1759     BlockDriverState *bs, *bs1;
1760     QEMUSnapshotInfo *sn_tab, *sn;
1761     int nb_sns, i;
1762     char buf[256];
1763
1764     bs = get_bs_snapshots();
1765     if (!bs) {
1766         monitor_printf(mon, "No available block device supports snapshots\n");
1767         return;
1768     }
1769     monitor_printf(mon, "Snapshot devices:");
1770     QTAILQ_FOREACH(dinfo, &drives, next) {
1771         bs1 = dinfo->bdrv;
1772         if (bdrv_has_snapshot(bs1)) {
1773             if (bs == bs1)
1774                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1775         }
1776     }
1777     monitor_printf(mon, "\n");
1778
1779     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1780     if (nb_sns < 0) {
1781         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1782         return;
1783     }
1784     monitor_printf(mon, "Snapshot list (from %s):\n",
1785                    bdrv_get_device_name(bs));
1786     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1787     for(i = 0; i < nb_sns; i++) {
1788         sn = &sn_tab[i];
1789         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1790     }
1791     qemu_free(sn_tab);
1792 }