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     uint8_t buf[60];
 130     static int count = SELF_ANNOUNCE_ROUNDS;
 131     QEMUTimer *timer = *(QEMUTimer **)opaque;
 132
 133     for (i = 0; i < MAX_NICS; i++) {
 134         if (!nd_table[i].used)
 135             continue;
 136         len = announce_self_create(buf, nd_table[i].macaddr);
 137         qemu_send_packet_raw(nd_table[i].vc, buf, len);
 138     }
 139     if (--count) {
 140         /* delay 50ms, 150ms, 250ms, ... */
 141         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 142                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 143     } else {
 144             qemu_del_timer(timer);
 145             qemu_free_timer(timer);
 146     }
 147 }
 148
 149 void qemu_announce_self(void)
 150 {
 151         static QEMUTimer *timer;
 152         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 153         qemu_announce_self_once(&timer);
 154 }
 155
 156 /***********************************************************/
 157 /* savevm/loadvm support */
 158
 159 #define IO_BUF_SIZE 32768
 160
 161 struct QEMUFile {
 162     QEMUFilePutBufferFunc *put_buffer;
 163     QEMUFileGetBufferFunc *get_buffer;
 164     QEMUFileCloseFunc *close;
 165     QEMUFileRateLimit *rate_limit;
 166     QEMUFileSetRateLimit *set_rate_limit;
 167     void *opaque;
 168     int is_write;
 169
 170     int64_t buf_offset; /* start of buffer when writing, end of buffer
 171                            when reading */
 172     int buf_index;
 173     int buf_size; /* 0 when writing */
 174     uint8_t buf[IO_BUF_SIZE];
 175
 176     int has_error;
 177 };
 178
 179 typedef struct QEMUFileStdio
 180 {
 181     FILE *stdio_file;
 182     QEMUFile *file;
 183 } QEMUFileStdio;
 184
 185 typedef struct QEMUFileSocket
 186 {
 187     int fd;
 188     QEMUFile *file;
 189 } QEMUFileSocket;
 190
 191 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 192 {
 193     QEMUFileSocket *s = opaque;
 194     ssize_t len;
 195
 196     do {
 197         len = recv(s->fd, (void *)buf, size, 0);
 198     } while (len == -1 && socket_error() == EINTR);
 199
 200     if (len == -1)
 201         len = -socket_error();
 202
 203     return len;
 204 }
 205
 206 static int socket_close(void *opaque)
 207 {
 208     QEMUFileSocket *s = opaque;
 209     qemu_free(s);
 210     return 0;
 211 }
 212
 213 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 214 {
 215     QEMUFileStdio *s = opaque;
 216     return fwrite(buf, 1, size, s->stdio_file);
 217 }
 218
 219 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 220 {
 221     QEMUFileStdio *s = opaque;
 222     FILE *fp = s->stdio_file;
 223     int bytes;
 224
 225     do {
 226         clearerr(fp);
 227         bytes = fread(buf, 1, size, fp);
 228     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 229     return bytes;
 230 }
 231
 232 static int stdio_pclose(void *opaque)
 233 {
 234     QEMUFileStdio *s = opaque;
 235     pclose(s->stdio_file);
 236     qemu_free(s);
 237     return 0;
 238 }
 239
 240 static int stdio_fclose(void *opaque)
 241 {
 242     QEMUFileStdio *s = opaque;
 243     fclose(s->stdio_file);
 244     qemu_free(s);
 245     return 0;
 246 }
 247
 248 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 249 {
 250     QEMUFileStdio *s;
 251
 252     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 253         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 254         return NULL;
 255     }
 256
 257     s = qemu_mallocz(sizeof(QEMUFileStdio));
 258
 259     s->stdio_file = stdio_file;
 260
 261     if(mode[0] == 'r') {
 262         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
 263     } else {
 264         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, NULL, NULL);
 265     }
 266     return s->file;
 267 }
 268
 269 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 270 {
 271     FILE *popen_file;
 272
 273     popen_file = popen(command, mode);
 274     if(popen_file == NULL) {
 275         return NULL;
 276     }
 277
 278     return qemu_popen(popen_file, mode);
 279 }
 280
 281 int qemu_stdio_fd(QEMUFile *f)
 282 {
 283     QEMUFileStdio *p;
 284     int fd;
 285
 286     p = (QEMUFileStdio *)f->opaque;
 287     fd = fileno(p->stdio_file);
 288
 289     return fd;
 290 }
 291
 292 QEMUFile *qemu_fdopen(int fd, const char *mode)
 293 {
 294     QEMUFileStdio *s;
 295
 296     if (mode == NULL ||
 297         (mode[0] != 'r' && mode[0] != 'w') ||
 298         mode[1] != 'b' || mode[2] != 0) {
 299         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 300         return NULL;
 301     }
 302
 303     s = qemu_mallocz(sizeof(QEMUFileStdio));
 304     s->stdio_file = fdopen(fd, mode);
 305     if (!s->stdio_file)
 306         goto fail;
 307
 308     if(mode[0] == 'r') {
 309         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, NULL, NULL);
 310     } else {
 311         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, NULL, NULL);
 312     }
 313     return s->file;
 314
 315 fail:
 316     qemu_free(s);
 317     return NULL;
 318 }
 319
 320 QEMUFile *qemu_fopen_socket(int fd)
 321 {
 322     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 323
 324     s->fd = fd;
 325     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL, NULL);
 326     return s->file;
 327 }
 328
 329 static int file_put_buffer(void *opaque, const uint8_t *buf,
 330                             int64_t pos, int size)
 331 {
 332     QEMUFileStdio *s = opaque;
 333     fseek(s->stdio_file, pos, SEEK_SET);
 334     fwrite(buf, 1, size, s->stdio_file);
 335     return size;
 336 }
 337
 338 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 339 {
 340     QEMUFileStdio *s = opaque;
 341     fseek(s->stdio_file, pos, SEEK_SET);
 342     return fread(buf, 1, size, s->stdio_file);
 343 }
 344
 345 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 346 {
 347     QEMUFileStdio *s;
 348
 349     if (mode == NULL ||
 350         (mode[0] != 'r' && mode[0] != 'w') ||
 351         mode[1] != 'b' || mode[2] != 0) {
 352         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 353         return NULL;
 354     }
 355
 356     s = qemu_mallocz(sizeof(QEMUFileStdio));
 357
 358     s->stdio_file = fopen(filename, mode);
 359     if (!s->stdio_file)
 360         goto fail;
 361
 362     if(mode[0] == 'w') {
 363         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, NULL, NULL);
 364     } else {
 365         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
 366     }
 367     return s->file;
 368 fail:
 369     qemu_free(s);
 370     return NULL;
 371 }
 372
 373 static int block_put_buffer(void *opaque, const uint8_t *buf,
 374                            int64_t pos, int size)
 375 {
 376     bdrv_save_vmstate(opaque, buf, pos, size);
 377     return size;
 378 }
 379
 380 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 381 {
 382     return bdrv_load_vmstate(opaque, buf, pos, size);
 383 }
 384
 385 static int bdrv_fclose(void *opaque)
 386 {
 387     return 0;
 388 }
 389
 390 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 391 {
 392     if (is_writable)
 393         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
 394     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
 395 }
 396
 397 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 398                          QEMUFileGetBufferFunc *get_buffer,
 399                          QEMUFileCloseFunc *close,
 400                          QEMUFileRateLimit *rate_limit,
 401                          QEMUFileSetRateLimit *set_rate_limit)
 402 {
 403     QEMUFile *f;
 404
 405     f = qemu_mallocz(sizeof(QEMUFile));
 406
 407     f->opaque = opaque;
 408     f->put_buffer = put_buffer;
 409     f->get_buffer = get_buffer;
 410     f->close = close;
 411     f->rate_limit = rate_limit;
 412     f->set_rate_limit = set_rate_limit;
 413     f->is_write = 0;
 414
 415     return f;
 416 }
 417
 418 int qemu_file_has_error(QEMUFile *f)
 419 {
 420     return f->has_error;
 421 }
 422
 423 void qemu_file_set_error(QEMUFile *f)
 424 {
 425     f->has_error = 1;
 426 }
 427
 428 void qemu_fflush(QEMUFile *f)
 429 {
 430     if (!f->put_buffer)
 431         return;
 432
 433     if (f->is_write && f->buf_index > 0) {
 434         int len;
 435
 436         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 437         if (len > 0)
 438             f->buf_offset += f->buf_index;
 439         else
 440             f->has_error = 1;
 441         f->buf_index = 0;
 442     }
 443 }
 444
 445 static void qemu_fill_buffer(QEMUFile *f)
 446 {
 447     int len;
 448
 449     if (!f->get_buffer)
 450         return;
 451
 452     if (f->is_write)
 453         abort();
 454
 455     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 456     if (len > 0) {
 457         f->buf_index = 0;
 458         f->buf_size = len;
 459         f->buf_offset += len;
 460     } else if (len != -EAGAIN)
 461         f->has_error = 1;
 462 }
 463
 464 int qemu_fclose(QEMUFile *f)
 465 {
 466     int ret = 0;
 467     qemu_fflush(f);
 468     if (f->close)
 469         ret = f->close(f->opaque);
 470     qemu_free(f);
 471     return ret;
 472 }
 473
 474 void qemu_file_put_notify(QEMUFile *f)
 475 {
 476     f->put_buffer(f->opaque, NULL, 0, 0);
 477 }
 478
 479 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 480 {
 481     int l;
 482
 483     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 484         fprintf(stderr,
 485                 "Attempted to write to buffer while read buffer is not empty\n");
 486         abort();
 487     }
 488
 489     while (!f->has_error && size > 0) {
 490         l = IO_BUF_SIZE - f->buf_index;
 491         if (l > size)
 492             l = size;
 493         memcpy(f->buf + f->buf_index, buf, l);
 494         f->is_write = 1;
 495         f->buf_index += l;
 496         buf += l;
 497         size -= l;
 498         if (f->buf_index >= IO_BUF_SIZE)
 499             qemu_fflush(f);
 500     }
 501 }
 502
 503 void qemu_put_byte(QEMUFile *f, int v)
 504 {
 505     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 506         fprintf(stderr,
 507                 "Attempted to write to buffer while read buffer is not empty\n");
 508         abort();
 509     }
 510
 511     f->buf[f->buf_index++] = v;
 512     f->is_write = 1;
 513     if (f->buf_index >= IO_BUF_SIZE)
 514         qemu_fflush(f);
 515 }
 516
 517 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 518 {
 519     int size, l;
 520
 521     if (f->is_write)
 522         abort();
 523
 524     size = size1;
 525     while (size > 0) {
 526         l = f->buf_size - f->buf_index;
 527         if (l == 0) {
 528             qemu_fill_buffer(f);
 529             l = f->buf_size - f->buf_index;
 530             if (l == 0)
 531                 break;
 532         }
 533         if (l > size)
 534             l = size;
 535         memcpy(buf, f->buf + f->buf_index, l);
 536         f->buf_index += l;
 537         buf += l;
 538         size -= l;
 539     }
 540     return size1 - size;
 541 }
 542
 543 int qemu_get_byte(QEMUFile *f)
 544 {
 545     if (f->is_write)
 546         abort();
 547
 548     if (f->buf_index >= f->buf_size) {
 549         qemu_fill_buffer(f);
 550         if (f->buf_index >= f->buf_size)
 551             return 0;
 552     }
 553     return f->buf[f->buf_index++];
 554 }
 555
 556 int64_t qemu_ftell(QEMUFile *f)
 557 {
 558     return f->buf_offset - f->buf_size + f->buf_index;
 559 }
 560
 561 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 562 {
 563     if (whence == SEEK_SET) {
 564         /* nothing to do */
 565     } else if (whence == SEEK_CUR) {
 566         pos += qemu_ftell(f);
 567     } else {
 568         /* SEEK_END not supported */
 569         return -1;
 570     }
 571     if (f->put_buffer) {
 572         qemu_fflush(f);
 573         f->buf_offset = pos;
 574     } else {
 575         f->buf_offset = pos;
 576         f->buf_index = 0;
 577         f->buf_size = 0;
 578     }
 579     return pos;
 580 }
 581
 582 int qemu_file_rate_limit(QEMUFile *f)
 583 {
 584     if (f->rate_limit)
 585         return f->rate_limit(f->opaque);
 586
 587     return 0;
 588 }
 589
 590 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 591 {
 592     /* any failed or completed migration keeps its state to allow probing of
 593      * migration data, but has no associated file anymore */
 594     if (f && f->set_rate_limit)
 595         return f->set_rate_limit(f->opaque, new_rate);
 596
 597     return 0;
 598 }
 599
 600 void qemu_put_be16(QEMUFile *f, unsigned int v)
 601 {
 602     qemu_put_byte(f, v >> 8);
 603     qemu_put_byte(f, v);
 604 }
 605
 606 void qemu_put_be32(QEMUFile *f, unsigned int v)
 607 {
 608     qemu_put_byte(f, v >> 24);
 609     qemu_put_byte(f, v >> 16);
 610     qemu_put_byte(f, v >> 8);
 611     qemu_put_byte(f, v);
 612 }
 613
 614 void qemu_put_be64(QEMUFile *f, uint64_t v)
 615 {
 616     qemu_put_be32(f, v >> 32);
 617     qemu_put_be32(f, v);
 618 }
 619
 620 unsigned int qemu_get_be16(QEMUFile *f)
 621 {
 622     unsigned int v;
 623     v = qemu_get_byte(f) << 8;
 624     v |= qemu_get_byte(f);
 625     return v;
 626 }
 627
 628 unsigned int qemu_get_be32(QEMUFile *f)
 629 {
 630     unsigned int v;
 631     v = qemu_get_byte(f) << 24;
 632     v |= qemu_get_byte(f) << 16;
 633     v |= qemu_get_byte(f) << 8;
 634     v |= qemu_get_byte(f);
 635     return v;
 636 }
 637
 638 uint64_t qemu_get_be64(QEMUFile *f)
 639 {
 640     uint64_t v;
 641     v = (uint64_t)qemu_get_be32(f) << 32;
 642     v |= qemu_get_be32(f);
 643     return v;
 644 }
 645
 646 /* 8 bit int */
 647
 648 static int get_int8(QEMUFile *f, void *pv, size_t size)
 649 {
 650     int8_t *v = pv;
 651     qemu_get_s8s(f, v);
 652     return 0;
 653 }
 654
 655 static void put_int8(QEMUFile *f, void *pv, size_t size)
 656 {
 657     int8_t *v = pv;
 658     qemu_put_s8s(f, v);
 659 }
 660
 661 const VMStateInfo vmstate_info_int8 = {
 662     .name = "int8",
 663     .get  = get_int8,
 664     .put  = put_int8,
 665 };
 666
 667 /* 16 bit int */
 668
 669 static int get_int16(QEMUFile *f, void *pv, size_t size)
 670 {
 671     int16_t *v = pv;
 672     qemu_get_sbe16s(f, v);
 673     return 0;
 674 }
 675
 676 static void put_int16(QEMUFile *f, void *pv, size_t size)
 677 {
 678     int16_t *v = pv;
 679     qemu_put_sbe16s(f, v);
 680 }
 681
 682 const VMStateInfo vmstate_info_int16 = {
 683     .name = "int16",
 684     .get  = get_int16,
 685     .put  = put_int16,
 686 };
 687
 688 /* 32 bit int */
 689
 690 static int get_int32(QEMUFile *f, void *pv, size_t size)
 691 {
 692     int32_t *v = pv;
 693     qemu_get_sbe32s(f, v);
 694     return 0;
 695 }
 696
 697 static void put_int32(QEMUFile *f, void *pv, size_t size)
 698 {
 699     int32_t *v = pv;
 700     qemu_put_sbe32s(f, v);
 701 }
 702
 703 const VMStateInfo vmstate_info_int32 = {
 704     .name = "int32",
 705     .get  = get_int32,
 706     .put  = put_int32,
 707 };
 708
 709 /* 32 bit int. See that the received value is the same than the one
 710    in the field */
 711
 712 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 713 {
 714     int32_t *v = pv;
 715     int32_t v2;
 716     qemu_get_sbe32s(f, &v2);
 717
 718     if (*v == v2)
 719         return 0;
 720     return -EINVAL;
 721 }
 722
 723 const VMStateInfo vmstate_info_int32_equal = {
 724     .name = "int32 equal",
 725     .get  = get_int32_equal,
 726     .put  = put_int32,
 727 };
 728
 729 /* 32 bit int. See that the received value is the less or the same
 730    than the one in the field */
 731
 732 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 733 {
 734     int32_t *old = pv;
 735     int32_t new;
 736     qemu_get_sbe32s(f, &new);
 737
 738     if (*old <= new)
 739         return 0;
 740     return -EINVAL;
 741 }
 742
 743 const VMStateInfo vmstate_info_int32_le = {
 744     .name = "int32 equal",
 745     .get  = get_int32_le,
 746     .put  = put_int32,
 747 };
 748
 749 /* 64 bit int */
 750
 751 static int get_int64(QEMUFile *f, void *pv, size_t size)
 752 {
 753     int64_t *v = pv;
 754     qemu_get_sbe64s(f, v);
 755     return 0;
 756 }
 757
 758 static void put_int64(QEMUFile *f, void *pv, size_t size)
 759 {
 760     int64_t *v = pv;
 761     qemu_put_sbe64s(f, v);
 762 }
 763
 764 const VMStateInfo vmstate_info_int64 = {
 765     .name = "int64",
 766     .get  = get_int64,
 767     .put  = put_int64,
 768 };
 769
 770 /* 8 bit unsigned int */
 771
 772 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 773 {
 774     uint8_t *v = pv;
 775     qemu_get_8s(f, v);
 776     return 0;
 777 }
 778
 779 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 780 {
 781     uint8_t *v = pv;
 782     qemu_put_8s(f, v);
 783 }
 784
 785 const VMStateInfo vmstate_info_uint8 = {
 786     .name = "uint8",
 787     .get  = get_uint8,
 788     .put  = put_uint8,
 789 };
 790
 791 /* 16 bit unsigned int */
 792
 793 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 794 {
 795     uint16_t *v = pv;
 796     qemu_get_be16s(f, v);
 797     return 0;
 798 }
 799
 800 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 801 {
 802     uint16_t *v = pv;
 803     qemu_put_be16s(f, v);
 804 }
 805
 806 const VMStateInfo vmstate_info_uint16 = {
 807     .name = "uint16",
 808     .get  = get_uint16,
 809     .put  = put_uint16,
 810 };
 811
 812 /* 32 bit unsigned int */
 813
 814 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 815 {
 816     uint32_t *v = pv;
 817     qemu_get_be32s(f, v);
 818     return 0;
 819 }
 820
 821 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 822 {
 823     uint32_t *v = pv;
 824     qemu_put_be32s(f, v);
 825 }
 826
 827 const VMStateInfo vmstate_info_uint32 = {
 828     .name = "uint32",
 829     .get  = get_uint32,
 830     .put  = put_uint32,
 831 };
 832
 833 /* 64 bit unsigned int */
 834
 835 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 836 {
 837     uint64_t *v = pv;
 838     qemu_get_be64s(f, v);
 839     return 0;
 840 }
 841
 842 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 843 {
 844     uint64_t *v = pv;
 845     qemu_put_be64s(f, v);
 846 }
 847
 848 const VMStateInfo vmstate_info_uint64 = {
 849     .name = "uint64",
 850     .get  = get_uint64,
 851     .put  = put_uint64,
 852 };
 853
 854 /* 64 bit linux kernel unsigned int */
 855
 856 #ifdef __linux__
 857 static int get_u64(QEMUFile *f, void *pv, size_t size)
 858 {
 859     __u64 *v = pv;
 860     qemu_get_be64s(f, (uint64_t *)v);
 861     return 0;
 862 }
 863
 864 static void put_u64(QEMUFile *f, void *pv, size_t size)
 865 {
 866     __u64 *v = pv;
 867     qemu_put_be64s(f, (uint64_t *)v);
 868 }
 869
 870 const VMStateInfo vmstate_info_u64 = {
 871     .name = "__u64",
 872     .get  = get_u64,
 873     .put  = put_u64,
 874 };
 875 #endif /* __linux__ */
 876
 877 /* 8 bit int. See that the received value is the same than the one
 878    in the field */
 879
 880 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 881 {
 882     uint8_t *v = pv;
 883     uint8_t v2;
 884     qemu_get_8s(f, &v2);
 885
 886     if (*v == v2)
 887         return 0;
 888     return -EINVAL;
 889 }
 890
 891 const VMStateInfo vmstate_info_uint8_equal = {
 892     .name = "uint8 equal",
 893     .get  = get_uint8_equal,
 894     .put  = put_uint8,
 895 };
 896
 897 /* 16 bit unsigned int int. See that the received value is the same than the one
 898    in the field */
 899
 900 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 901 {
 902     uint16_t *v = pv;
 903     uint16_t v2;
 904     qemu_get_be16s(f, &v2);
 905
 906     if (*v == v2)
 907         return 0;
 908     return -EINVAL;
 909 }
 910
 911 const VMStateInfo vmstate_info_uint16_equal = {
 912     .name = "uint16 equal",
 913     .get  = get_uint16_equal,
 914     .put  = put_uint16,
 915 };
 916
 917 /* timers  */
 918
 919 static int get_timer(QEMUFile *f, void *pv, size_t size)
 920 {
 921     QEMUTimer *v = pv;
 922     qemu_get_timer(f, v);
 923     return 0;
 924 }
 925
 926 static void put_timer(QEMUFile *f, void *pv, size_t size)
 927 {
 928     QEMUTimer *v = pv;
 929     qemu_put_timer(f, v);
 930 }
 931
 932 const VMStateInfo vmstate_info_timer = {
 933     .name = "timer",
 934     .get  = get_timer,
 935     .put  = put_timer,
 936 };
 937
 938 /* uint8_t buffers */
 939
 940 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 941 {
 942     uint8_t *v = pv;
 943     qemu_get_buffer(f, v, size);
 944     return 0;
 945 }
 946
 947 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 948 {
 949     uint8_t *v = pv;
 950     qemu_put_buffer(f, v, size);
 951 }
 952
 953 const VMStateInfo vmstate_info_buffer = {
 954     .name = "buffer",
 955     .get  = get_buffer,
 956     .put  = put_buffer,
 957 };
 958
 959 /* unused buffers: space that was used for some fields that are
 960    not usefull anymore */
 961
 962 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 963 {
 964     qemu_fseek(f, size, SEEK_CUR);
 965     return 0;
 966 }
 967
 968 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 969 {
 970     qemu_fseek(f, size, SEEK_CUR);
 971 }
 972
 973 const VMStateInfo vmstate_info_unused_buffer = {
 974     .name = "unused_buffer",
 975     .get  = get_unused_buffer,
 976     .put  = put_unused_buffer,
 977 };
 978
 979 typedef struct SaveStateEntry {
 980     QTAILQ_ENTRY(SaveStateEntry) entry;
 981     char idstr[256];
 982     int instance_id;
 983     int version_id;
 984     int section_id;
 985     SaveLiveStateHandler *save_live_state;
 986     SaveStateHandler *save_state;
 987     LoadStateHandler *load_state;
 988     const VMStateDescription *vmsd;
 989     void *opaque;
 990 } SaveStateEntry;
 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                          SaveLiveStateHandler *save_live_state,
1018                          SaveStateHandler *save_state,
1019                          LoadStateHandler *load_state,
1020                          void *opaque)
1021 {
1022     SaveStateEntry *se;
1023
1024     se = qemu_malloc(sizeof(SaveStateEntry));
1025     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1026     se->version_id = version_id;
1027     se->section_id = global_section_id++;
1028     se->save_live_state = save_live_state;
1029     se->save_state = save_state;
1030     se->load_state = load_state;
1031     se->opaque = opaque;
1032     se->vmsd = NULL;
1033
1034     if (instance_id == -1) {
1035         se->instance_id = calculate_new_instance_id(idstr);
1036     } else {
1037         se->instance_id = instance_id;
1038     }
1039     /* add at the end of list */
1040     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1041     return 0;
1042 }
1043
1044 int register_savevm(const char *idstr,
1045                     int instance_id,
1046                     int version_id,
1047                     SaveStateHandler *save_state,
1048                     LoadStateHandler *load_state,
1049                     void *opaque)
1050 {
1051     return register_savevm_live(idstr, instance_id, version_id,
1052                                 NULL, save_state, load_state, opaque);
1053 }
1054
1055 void unregister_savevm(const char *idstr, void *opaque)
1056 {
1057     SaveStateEntry *se, *new_se;
1058
1059     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1060         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1061             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1062             qemu_free(se);
1063         }
1064     }
1065 }
1066
1067 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1068                      void *opaque)
1069 {
1070     SaveStateEntry *se;
1071
1072     se = qemu_malloc(sizeof(SaveStateEntry));
1073     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1074     se->version_id = vmsd->version_id;
1075     se->section_id = global_section_id++;
1076     se->save_live_state = NULL;
1077     se->save_state = NULL;
1078     se->load_state = NULL;
1079     se->opaque = opaque;
1080     se->vmsd = vmsd;
1081
1082     if (instance_id == -1) {
1083         se->instance_id = calculate_new_instance_id(vmsd->name);
1084     } else {
1085         se->instance_id = instance_id;
1086     }
1087     /* add at the end of list */
1088     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1089     return 0;
1090 }
1091
1092 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1093 {
1094     SaveStateEntry *se, *new_se;
1095
1096     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1097         if (se->vmsd == vmsd && se->opaque == opaque) {
1098             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1099             qemu_free(se);
1100         }
1101     }
1102 }
1103
1104 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1105                        void *opaque, int version_id)
1106 {
1107     VMStateField *field = vmsd->fields;
1108
1109     if (version_id > vmsd->version_id) {
1110         return -EINVAL;
1111     }
1112     if (version_id < vmsd->minimum_version_id_old) {
1113         return -EINVAL;
1114     }
1115     if  (version_id < vmsd->minimum_version_id) {
1116         return vmsd->load_state_old(f, opaque, version_id);
1117     }
1118     if (vmsd->pre_load) {
1119         int ret = vmsd->pre_load(opaque);
1120         if (ret)
1121             return ret;
1122     }
1123     while(field->name) {
1124         if ((field->field_exists &&
1125              field->field_exists(opaque, version_id)) ||
1126             (!field->field_exists &&
1127              field->version_id <= version_id)) {
1128             void *base_addr = opaque + field->offset;
1129             int ret, i, n_elems = 1;
1130
1131             if (field->flags & VMS_ARRAY) {
1132                 n_elems = field->num;
1133             } else if (field->flags & VMS_VARRAY_INT32) {
1134                 n_elems = *(int32_t *)(opaque+field->num_offset);
1135             } else if (field->flags & VMS_VARRAY_UINT16) {
1136                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1137             }
1138             if (field->flags & VMS_POINTER) {
1139                 base_addr = *(void **)base_addr;
1140             }
1141             for (i = 0; i < n_elems; i++) {
1142                 void *addr = base_addr + field->size * i;
1143
1144                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1145                     addr = *(void **)addr;
1146                 }
1147                 if (field->flags & VMS_STRUCT) {
1148                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1149                 } else {
1150                     ret = field->info->get(f, addr, field->size);
1151
1152                 }
1153                 if (ret < 0) {
1154                     return ret;
1155                 }
1156             }
1157         }
1158         field++;
1159     }
1160     if (vmsd->post_load) {
1161         return vmsd->post_load(opaque, version_id);
1162     }
1163     return 0;
1164 }
1165
1166 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1167                         void *opaque)
1168 {
1169     VMStateField *field = vmsd->fields;
1170
1171     if (vmsd->pre_save) {
1172         vmsd->pre_save(opaque);
1173     }
1174     while(field->name) {
1175         if (!field->field_exists ||
1176             field->field_exists(opaque, vmsd->version_id)) {
1177             void *base_addr = opaque + field->offset;
1178             int i, n_elems = 1;
1179
1180             if (field->flags & VMS_ARRAY) {
1181                 n_elems = field->num;
1182             } else if (field->flags & VMS_VARRAY_INT32) {
1183                 n_elems = *(int32_t *)(opaque+field->num_offset);
1184             } else if (field->flags & VMS_VARRAY_UINT16) {
1185                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1186             }
1187             if (field->flags & VMS_POINTER) {
1188                 base_addr = *(void **)base_addr;
1189             }
1190             for (i = 0; i < n_elems; i++) {
1191                 void *addr = base_addr + field->size * i;
1192
1193                 if (field->flags & VMS_STRUCT) {
1194                     vmstate_save_state(f, field->vmsd, addr);
1195                 } else {
1196                     field->info->put(f, addr, field->size);
1197                 }
1198             }
1199         }
1200         field++;
1201     }
1202     if (vmsd->post_save) {
1203         vmsd->post_save(opaque);
1204     }
1205 }
1206
1207 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1208 {
1209     if (!se->vmsd) {         /* Old style */
1210         return se->load_state(f, se->opaque, version_id);
1211     }
1212     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1213 }
1214
1215 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1216 {
1217     if (!se->vmsd) {         /* Old style */
1218         se->save_state(f, se->opaque);
1219         return;
1220     }
1221     vmstate_save_state(f,se->vmsd, se->opaque);
1222 }
1223
1224 #define QEMU_VM_FILE_MAGIC           0x5145564d
1225 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1226 #define QEMU_VM_FILE_VERSION         0x00000003
1227
1228 #define QEMU_VM_EOF                  0x00
1229 #define QEMU_VM_SECTION_START        0x01
1230 #define QEMU_VM_SECTION_PART         0x02
1231 #define QEMU_VM_SECTION_END          0x03
1232 #define QEMU_VM_SECTION_FULL         0x04
1233
1234 int qemu_savevm_state_begin(QEMUFile *f)
1235 {
1236     SaveStateEntry *se;
1237
1238     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1239     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1240
1241     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1242         int len;
1243
1244         if (se->save_live_state == NULL)
1245             continue;
1246
1247         /* Section type */
1248         qemu_put_byte(f, QEMU_VM_SECTION_START);
1249         qemu_put_be32(f, se->section_id);
1250
1251         /* ID string */
1252         len = strlen(se->idstr);
1253         qemu_put_byte(f, len);
1254         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1255
1256         qemu_put_be32(f, se->instance_id);
1257         qemu_put_be32(f, se->version_id);
1258
1259         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1260     }
1261
1262     if (qemu_file_has_error(f))
1263         return -EIO;
1264
1265     return 0;
1266 }
1267
1268 int qemu_savevm_state_iterate(QEMUFile *f)
1269 {
1270     SaveStateEntry *se;
1271     int ret = 1;
1272
1273     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1274         if (se->save_live_state == NULL)
1275             continue;
1276
1277         /* Section type */
1278         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1279         qemu_put_be32(f, se->section_id);
1280
1281         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1282     }
1283
1284     if (ret)
1285         return 1;
1286
1287     if (qemu_file_has_error(f))
1288         return -EIO;
1289
1290     return 0;
1291 }
1292
1293 int qemu_savevm_state_complete(QEMUFile *f)
1294 {
1295     SaveStateEntry *se;
1296
1297     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1298         if (se->save_live_state == NULL)
1299             continue;
1300
1301         /* Section type */
1302         qemu_put_byte(f, QEMU_VM_SECTION_END);
1303         qemu_put_be32(f, se->section_id);
1304
1305         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1306     }
1307
1308     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1309         int len;
1310
1311         if (se->save_state == NULL && se->vmsd == NULL)
1312             continue;
1313
1314         /* Section type */
1315         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1316         qemu_put_be32(f, se->section_id);
1317
1318         /* ID string */
1319         len = strlen(se->idstr);
1320         qemu_put_byte(f, len);
1321         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1322
1323         qemu_put_be32(f, se->instance_id);
1324         qemu_put_be32(f, se->version_id);
1325
1326         vmstate_save(f, se);
1327     }
1328
1329     qemu_put_byte(f, QEMU_VM_EOF);
1330
1331     if (qemu_file_has_error(f))
1332         return -EIO;
1333
1334     return 0;
1335 }
1336
1337 int qemu_savevm_state(QEMUFile *f)
1338 {
1339     int saved_vm_running;
1340     int ret;
1341
1342     saved_vm_running = vm_running;
1343     vm_stop(0);
1344
1345     bdrv_flush_all();
1346
1347     ret = qemu_savevm_state_begin(f);
1348     if (ret < 0)
1349         goto out;
1350
1351     do {
1352         ret = qemu_savevm_state_iterate(f);
1353         if (ret < 0)
1354             goto out;
1355     } while (ret == 0);
1356
1357     ret = qemu_savevm_state_complete(f);
1358
1359 out:
1360     if (qemu_file_has_error(f))
1361         ret = -EIO;
1362
1363     if (!ret && saved_vm_running)
1364         vm_start();
1365
1366     return ret;
1367 }
1368
1369 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1370 {
1371     SaveStateEntry *se;
1372
1373     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1374         if (!strcmp(se->idstr, idstr) &&
1375             instance_id == se->instance_id)
1376             return se;
1377     }
1378     return NULL;
1379 }
1380
1381 typedef struct LoadStateEntry {
1382     QLIST_ENTRY(LoadStateEntry) entry;
1383     SaveStateEntry *se;
1384     int section_id;
1385     int version_id;
1386 } LoadStateEntry;
1387
1388 int qemu_loadvm_state(QEMUFile *f)
1389 {
1390     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1391         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1392     LoadStateEntry *le, *new_le;
1393     uint8_t section_type;
1394     unsigned int v;
1395     int ret;
1396
1397     v = qemu_get_be32(f);
1398     if (v != QEMU_VM_FILE_MAGIC)
1399         return -EINVAL;
1400
1401     v = qemu_get_be32(f);
1402     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1403         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1404         return -ENOTSUP;
1405     }
1406     if (v != QEMU_VM_FILE_VERSION)
1407         return -ENOTSUP;
1408
1409     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1410         uint32_t instance_id, version_id, section_id;
1411         SaveStateEntry *se;
1412         char idstr[257];
1413         int len;
1414
1415         switch (section_type) {
1416         case QEMU_VM_SECTION_START:
1417         case QEMU_VM_SECTION_FULL:
1418             /* Read section start */
1419             section_id = qemu_get_be32(f);
1420             len = qemu_get_byte(f);
1421             qemu_get_buffer(f, (uint8_t *)idstr, len);
1422             idstr[len] = 0;
1423             instance_id = qemu_get_be32(f);
1424             version_id = qemu_get_be32(f);
1425
1426             /* Find savevm section */
1427             se = find_se(idstr, instance_id);
1428             if (se == NULL) {
1429                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1430                 ret = -EINVAL;
1431                 goto out;
1432             }
1433
1434             /* Validate version */
1435             if (version_id > se->version_id) {
1436                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1437                         version_id, idstr, se->version_id);
1438                 ret = -EINVAL;
1439                 goto out;
1440             }
1441
1442             /* Add entry */
1443             le = qemu_mallocz(sizeof(*le));
1444
1445             le->se = se;
1446             le->section_id = section_id;
1447             le->version_id = version_id;
1448             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1449
1450             ret = vmstate_load(f, le->se, le->version_id);
1451             if (ret < 0) {
1452                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1453                         instance_id, idstr);
1454                 goto out;
1455             }
1456             break;
1457         case QEMU_VM_SECTION_PART:
1458         case QEMU_VM_SECTION_END:
1459             section_id = qemu_get_be32(f);
1460
1461             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1462                 if (le->section_id == section_id) {
1463                     break;
1464                 }
1465             }
1466             if (le == NULL) {
1467                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1468                 ret = -EINVAL;
1469                 goto out;
1470             }
1471
1472             ret = vmstate_load(f, le->se, le->version_id);
1473             if (ret < 0) {
1474                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1475                         section_id);
1476                 goto out;
1477             }
1478             break;
1479         default:
1480             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1481             ret = -EINVAL;
1482             goto out;
1483         }
1484     }
1485
1486     ret = 0;
1487
1488 out:
1489     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1490         QLIST_REMOVE(le, entry);
1491         qemu_free(le);
1492     }
1493
1494     if (qemu_file_has_error(f))
1495         ret = -EIO;
1496
1497     return ret;
1498 }
1499
1500 /* device can contain snapshots */
1501 static int bdrv_can_snapshot(BlockDriverState *bs)
1502 {
1503     return (bs &&
1504             !bdrv_is_removable(bs) &&
1505             !bdrv_is_read_only(bs));
1506 }
1507
1508 /* device must be snapshots in order to have a reliable snapshot */
1509 static int bdrv_has_snapshot(BlockDriverState *bs)
1510 {
1511     return (bs &&
1512             !bdrv_is_removable(bs) &&
1513             !bdrv_is_read_only(bs));
1514 }
1515
1516 static BlockDriverState *get_bs_snapshots(void)
1517 {
1518     BlockDriverState *bs;
1519     DriveInfo *dinfo;
1520
1521     if (bs_snapshots)
1522         return bs_snapshots;
1523     QTAILQ_FOREACH(dinfo, &drives, next) {
1524         bs = dinfo->bdrv;
1525         if (bdrv_can_snapshot(bs))
1526             goto ok;
1527     }
1528     return NULL;
1529  ok:
1530     bs_snapshots = bs;
1531     return bs;
1532 }
1533
1534 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1535                               const char *name)
1536 {
1537     QEMUSnapshotInfo *sn_tab, *sn;
1538     int nb_sns, i, ret;
1539
1540     ret = -ENOENT;
1541     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1542     if (nb_sns < 0)
1543         return ret;
1544     for(i = 0; i < nb_sns; i++) {
1545         sn = &sn_tab[i];
1546         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1547             *sn_info = *sn;
1548             ret = 0;
1549             break;
1550         }
1551     }
1552     qemu_free(sn_tab);
1553     return ret;
1554 }
1555
1556 void do_savevm(Monitor *mon, const QDict *qdict)
1557 {
1558     DriveInfo *dinfo;
1559     BlockDriverState *bs, *bs1;
1560     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1561     int must_delete, ret;
1562     QEMUFile *f;
1563     int saved_vm_running;
1564     uint32_t vm_state_size;
1565 #ifdef _WIN32
1566     struct _timeb tb;
1567 #else
1568     struct timeval tv;
1569 #endif
1570     const char *name = qdict_get_try_str(qdict, "name");
1571
1572     bs = get_bs_snapshots();
1573     if (!bs) {
1574         monitor_printf(mon, "No block device can accept snapshots\n");
1575         return;
1576     }
1577
1578     /* ??? Should this occur after vm_stop?  */
1579     qemu_aio_flush();
1580
1581     saved_vm_running = vm_running;
1582     vm_stop(0);
1583
1584     must_delete = 0;
1585     if (name) {
1586         ret = bdrv_snapshot_find(bs, old_sn, name);
1587         if (ret >= 0) {
1588             must_delete = 1;
1589         }
1590     }
1591     memset(sn, 0, sizeof(*sn));
1592     if (must_delete) {
1593         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1594         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1595     } else {
1596         if (name)
1597             pstrcpy(sn->name, sizeof(sn->name), name);
1598     }
1599
1600     /* fill auxiliary fields */
1601 #ifdef _WIN32
1602     _ftime(&tb);
1603     sn->date_sec = tb.time;
1604     sn->date_nsec = tb.millitm * 1000000;
1605 #else
1606     gettimeofday(&tv, NULL);
1607     sn->date_sec = tv.tv_sec;
1608     sn->date_nsec = tv.tv_usec * 1000;
1609 #endif
1610     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1611
1612     /* save the VM state */
1613     f = qemu_fopen_bdrv(bs, 1);
1614     if (!f) {
1615         monitor_printf(mon, "Could not open VM state file\n");
1616         goto the_end;
1617     }
1618     ret = qemu_savevm_state(f);
1619     vm_state_size = qemu_ftell(f);
1620     qemu_fclose(f);
1621     if (ret < 0) {
1622         monitor_printf(mon, "Error %d while writing VM\n", ret);
1623         goto the_end;
1624     }
1625
1626     /* create the snapshots */
1627
1628     QTAILQ_FOREACH(dinfo, &drives, next) {
1629         bs1 = dinfo->bdrv;
1630         if (bdrv_has_snapshot(bs1)) {
1631             if (must_delete) {
1632                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1633                 if (ret < 0) {
1634                     monitor_printf(mon,
1635                                    "Error while deleting snapshot on '%s'\n",
1636                                    bdrv_get_device_name(bs1));
1637                 }
1638             }
1639             /* Write VM state size only to the image that contains the state */
1640             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1641             ret = bdrv_snapshot_create(bs1, sn);
1642             if (ret < 0) {
1643                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1644                                bdrv_get_device_name(bs1));
1645             }
1646         }
1647     }
1648
1649  the_end:
1650     if (saved_vm_running)
1651         vm_start();
1652 }
1653
1654 int load_vmstate(Monitor *mon, const char *name)
1655 {
1656     DriveInfo *dinfo;
1657     BlockDriverState *bs, *bs1;
1658     QEMUSnapshotInfo sn;
1659     QEMUFile *f;
1660     int ret;
1661
1662     bs = get_bs_snapshots();
1663     if (!bs) {
1664         monitor_printf(mon, "No block device supports snapshots\n");
1665         return -EINVAL;
1666     }
1667
1668     /* Flush all IO requests so they don't interfere with the new state.  */
1669     qemu_aio_flush();
1670
1671     QTAILQ_FOREACH(dinfo, &drives, next) {
1672         bs1 = dinfo->bdrv;
1673         if (bdrv_has_snapshot(bs1)) {
1674             ret = bdrv_snapshot_goto(bs1, name);
1675             if (ret < 0) {
1676                 if (bs != bs1)
1677                     monitor_printf(mon, "Warning: ");
1678                 switch(ret) {
1679                 case -ENOTSUP:
1680                     monitor_printf(mon,
1681                                    "Snapshots not supported on device '%s'\n",
1682                                    bdrv_get_device_name(bs1));
1683                     break;
1684                 case -ENOENT:
1685                     monitor_printf(mon, "Could not find snapshot '%s' on "
1686                                    "device '%s'\n",
1687                                    name, bdrv_get_device_name(bs1));
1688                     break;
1689                 default:
1690                     monitor_printf(mon, "Error %d while activating snapshot on"
1691                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1692                     break;
1693                 }
1694                 /* fatal on snapshot block device */
1695                 if (bs == bs1)
1696                     return 0;
1697             }
1698         }
1699     }
1700
1701     /* Don't even try to load empty VM states */
1702     ret = bdrv_snapshot_find(bs, &sn, name);
1703     if ((ret >= 0) && (sn.vm_state_size == 0))
1704         return -EINVAL;
1705
1706     /* restore the VM state */
1707     f = qemu_fopen_bdrv(bs, 0);
1708     if (!f) {
1709         monitor_printf(mon, "Could not open VM state file\n");
1710         return -EINVAL;
1711     }
1712     ret = qemu_loadvm_state(f);
1713     qemu_fclose(f);
1714     if (ret < 0) {
1715         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1716         return ret;
1717     }
1718     return 0;
1719 }
1720
1721 void do_delvm(Monitor *mon, const QDict *qdict)
1722 {
1723     DriveInfo *dinfo;
1724     BlockDriverState *bs, *bs1;
1725     int ret;
1726     const char *name = qdict_get_str(qdict, "name");
1727
1728     bs = get_bs_snapshots();
1729     if (!bs) {
1730         monitor_printf(mon, "No block device supports snapshots\n");
1731         return;
1732     }
1733
1734     QTAILQ_FOREACH(dinfo, &drives, next) {
1735         bs1 = dinfo->bdrv;
1736         if (bdrv_has_snapshot(bs1)) {
1737             ret = bdrv_snapshot_delete(bs1, name);
1738             if (ret < 0) {
1739                 if (ret == -ENOTSUP)
1740                     monitor_printf(mon,
1741                                    "Snapshots not supported on device '%s'\n",
1742                                    bdrv_get_device_name(bs1));
1743                 else
1744                     monitor_printf(mon, "Error %d while deleting snapshot on "
1745                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1746             }
1747         }
1748     }
1749 }
1750
1751 void do_info_snapshots(Monitor *mon)
1752 {
1753     DriveInfo *dinfo;
1754     BlockDriverState *bs, *bs1;
1755     QEMUSnapshotInfo *sn_tab, *sn;
1756     int nb_sns, i;
1757     char buf[256];
1758
1759     bs = get_bs_snapshots();
1760     if (!bs) {
1761         monitor_printf(mon, "No available block device supports snapshots\n");
1762         return;
1763     }
1764     monitor_printf(mon, "Snapshot devices:");
1765     QTAILQ_FOREACH(dinfo, &drives, next) {
1766         bs1 = dinfo->bdrv;
1767         if (bdrv_has_snapshot(bs1)) {
1768             if (bs == bs1)
1769                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1770         }
1771     }
1772     monitor_printf(mon, "\n");
1773
1774     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1775     if (nb_sns < 0) {
1776         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1777         return;
1778     }
1779     monitor_printf(mon, "Snapshot list (from %s):\n",
1780                    bdrv_get_device_name(bs));
1781     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1782     for(i = 0; i < nb_sns; i++) {
1783         sn = &sn_tab[i];
1784         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1785     }
1786     qemu_free(sn_tab);
1787 }