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 HOST_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 #if defined(__NetBSD__)
  46 #include <net/if_tap.h>
  47 #endif
  48 #ifdef __linux__
  49 #include <linux/if_tun.h>
  50 #endif
  51 #include <arpa/inet.h>
  52 #include <dirent.h>
  53 #include <netdb.h>
  54 #include <sys/select.h>
  55 #ifdef HOST_BSD
  56 #include <sys/stat.h>
  57 #if defined(__FreeBSD__) || defined(__DragonFly__)
  58 #include <libutil.h>
  59 #else
  60 #include <util.h>
  61 #endif
  62 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  63 #include <freebsd/stdlib.h>
  64 #else
  65 #ifdef __linux__
  66 #include <pty.h>
  67 #include <malloc.h>
  68 #include <linux/rtc.h>
  69 #endif
  70 #endif
  71 #endif
  72
  73 #ifdef _WIN32
  74 #include <windows.h>
  75 #include <malloc.h>
  76 #include <sys/timeb.h>
  77 #include <mmsystem.h>
  78 #define getopt_long_only getopt_long
  79 #define memalign(align, size) malloc(size)
  80 #endif
  81
  82 #include "qemu-common.h"
  83 #include "hw/hw.h"
  84 #include "net.h"
  85 #include "monitor.h"
  86 #include "sysemu.h"
  87 #include "qemu-timer.h"
  88 #include "qemu-char.h"
  89 #include "block.h"
  90 #include "audio/audio.h"
  91 #include "migration.h"
  92 #include "qemu_socket.h"
  93
  94 /* point to the block driver where the snapshots are managed */
  95 static BlockDriverState *bs_snapshots;
  96
  97 #define SELF_ANNOUNCE_ROUNDS 5
  98 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
  99 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
 100 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
 101
 102 static int announce_self_create(uint8_t *buf,
 103                                 uint8_t *mac_addr)
 104 {
 105     uint32_t magic = EXPERIMENTAL_MAGIC;
 106     uint16_t proto = htons(ETH_P_EXPERIMENTAL);
 107
 108     /* FIXME: should we send a different packet (arp/rarp/ping)? */
 109
 110     memset(buf, 0xff, 6);         /* h_dst */
 111     memcpy(buf + 6, mac_addr, 6); /* h_src */
 112     memcpy(buf + 12, &proto, 2);  /* h_proto */
 113     memcpy(buf + 14, &magic, 4);  /* magic */
 114
 115     return 18; /* len */
 116 }
 117
 118 void qemu_announce_self(void)
 119 {
 120     int i, j, len;
 121     VLANState *vlan;
 122     VLANClientState *vc;
 123     uint8_t buf[256];
 124
 125     for (i = 0; i < MAX_NICS; i++) {
 126         if (!nd_table[i].used)
 127             continue;
 128         len = announce_self_create(buf, nd_table[i].macaddr);
 129         vlan = nd_table[i].vlan;
 130         for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 131             for (j=0; j < SELF_ANNOUNCE_ROUNDS; j++)
 132                 vc->fd_read(vc->opaque, buf, len);
 133         }
 134     }
 135 }
 136
 137 /***********************************************************/
 138 /* savevm/loadvm support */
 139
 140 #define IO_BUF_SIZE 32768
 141
 142 struct QEMUFile {
 143     QEMUFilePutBufferFunc *put_buffer;
 144     QEMUFileGetBufferFunc *get_buffer;
 145     QEMUFileCloseFunc *close;
 146     QEMUFileRateLimit *rate_limit;
 147     void *opaque;
 148     int is_write;
 149
 150     int64_t buf_offset; /* start of buffer when writing, end of buffer
 151                            when reading */
 152     int buf_index;
 153     int buf_size; /* 0 when writing */
 154     uint8_t buf[IO_BUF_SIZE];
 155
 156     int has_error;
 157 };
 158
 159 typedef struct QEMUFilePopen
 160 {
 161     FILE *popen_file;
 162     QEMUFile *file;
 163 } QEMUFilePopen;
 164
 165 typedef struct QEMUFileSocket
 166 {
 167     int fd;
 168     QEMUFile *file;
 169 } QEMUFileSocket;
 170
 171 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 172 {
 173     QEMUFileSocket *s = opaque;
 174     ssize_t len;
 175
 176     do {
 177         len = recv(s->fd, buf, size, 0);
 178     } while (len == -1 && socket_error() == EINTR);
 179
 180     if (len == -1)
 181         len = -socket_error();
 182
 183     return len;
 184 }
 185
 186 static int socket_close(void *opaque)
 187 {
 188     QEMUFileSocket *s = opaque;
 189     qemu_free(s);
 190     return 0;
 191 }
 192
 193 static int popen_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 194 {
 195     QEMUFilePopen *s = opaque;
 196     return fwrite(buf, 1, size, s->popen_file);
 197 }
 198
 199 static int popen_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 200 {
 201     QEMUFilePopen *s = opaque;
 202     return fread(buf, 1, size, s->popen_file);
 203 }
 204
 205 static int popen_close(void *opaque)
 206 {
 207     QEMUFilePopen *s = opaque;
 208     pclose(s->popen_file);
 209     qemu_free(s);
 210     return 0;
 211 }
 212
 213 QEMUFile *qemu_popen(FILE *popen_file, const char *mode)
 214 {
 215     QEMUFilePopen *s;
 216
 217     if (popen_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 218         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 219         return NULL;
 220     }
 221
 222     s = qemu_mallocz(sizeof(QEMUFilePopen));
 223
 224     s->popen_file = popen_file;
 225
 226     if(mode[0] == 'r') {
 227         s->file = qemu_fopen_ops(s, NULL, popen_get_buffer, popen_close, NULL);
 228     } else {
 229         s->file = qemu_fopen_ops(s, popen_put_buffer, NULL, popen_close, NULL);
 230     }
 231     fprintf(stderr, "qemu_popen: returning result of qemu_fopen_ops\n");
 232     return s->file;
 233 }
 234
 235 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 236 {
 237     FILE *popen_file;
 238
 239     popen_file = popen(command, mode);
 240     if(popen_file == NULL) {
 241         return NULL;
 242     }
 243
 244     return qemu_popen(popen_file, mode);
 245 }
 246
 247 QEMUFile *qemu_fopen_socket(int fd)
 248 {
 249     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 250
 251     s->fd = fd;
 252     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL);
 253     return s->file;
 254 }
 255
 256 typedef struct QEMUFileStdio
 257 {
 258     FILE *outfile;
 259 } QEMUFileStdio;
 260
 261 static int file_put_buffer(void *opaque, const uint8_t *buf,
 262                             int64_t pos, int size)
 263 {
 264     QEMUFileStdio *s = opaque;
 265     fseek(s->outfile, pos, SEEK_SET);
 266     fwrite(buf, 1, size, s->outfile);
 267     return size;
 268 }
 269
 270 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 271 {
 272     QEMUFileStdio *s = opaque;
 273     fseek(s->outfile, pos, SEEK_SET);
 274     return fread(buf, 1, size, s->outfile);
 275 }
 276
 277 static int file_close(void *opaque)
 278 {
 279     QEMUFileStdio *s = opaque;
 280     fclose(s->outfile);
 281     qemu_free(s);
 282     return 0;
 283 }
 284
 285 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 286 {
 287     QEMUFileStdio *s;
 288
 289     s = qemu_mallocz(sizeof(QEMUFileStdio));
 290
 291     s->outfile = fopen(filename, mode);
 292     if (!s->outfile)
 293         goto fail;
 294
 295     if (!strcmp(mode, "wb"))
 296         return qemu_fopen_ops(s, file_put_buffer, NULL, file_close, NULL);
 297     else if (!strcmp(mode, "rb"))
 298         return qemu_fopen_ops(s, NULL, file_get_buffer, file_close, NULL);
 299
 300 fail:
 301     if (s->outfile)
 302         fclose(s->outfile);
 303     qemu_free(s);
 304     return NULL;
 305 }
 306
 307 typedef struct QEMUFileBdrv
 308 {
 309     BlockDriverState *bs;
 310     int64_t base_offset;
 311 } QEMUFileBdrv;
 312
 313 static int block_put_buffer(void *opaque, const uint8_t *buf,
 314                            int64_t pos, int size)
 315 {
 316     QEMUFileBdrv *s = opaque;
 317     bdrv_put_buffer(s->bs, buf, s->base_offset + pos, size);
 318     return size;
 319 }
 320
 321 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 322 {
 323     QEMUFileBdrv *s = opaque;
 324     return bdrv_get_buffer(s->bs, buf, s->base_offset + pos, size);
 325 }
 326
 327 static int bdrv_fclose(void *opaque)
 328 {
 329     QEMUFileBdrv *s = opaque;
 330     qemu_free(s);
 331     return 0;
 332 }
 333
 334 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int64_t offset, int is_writable)
 335 {
 336     QEMUFileBdrv *s;
 337
 338     s = qemu_mallocz(sizeof(QEMUFileBdrv));
 339
 340     s->bs = bs;
 341     s->base_offset = offset;
 342
 343     if (is_writable)
 344         return qemu_fopen_ops(s, block_put_buffer, NULL, bdrv_fclose, NULL);
 345
 346     return qemu_fopen_ops(s, NULL, block_get_buffer, bdrv_fclose, NULL);
 347 }
 348
 349 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 350                          QEMUFileGetBufferFunc *get_buffer,
 351                          QEMUFileCloseFunc *close,
 352                          QEMUFileRateLimit *rate_limit)
 353 {
 354     QEMUFile *f;
 355
 356     f = qemu_mallocz(sizeof(QEMUFile));
 357
 358     f->opaque = opaque;
 359     f->put_buffer = put_buffer;
 360     f->get_buffer = get_buffer;
 361     f->close = close;
 362     f->rate_limit = rate_limit;
 363     f->is_write = 0;
 364
 365     return f;
 366 }
 367
 368 int qemu_file_has_error(QEMUFile *f)
 369 {
 370     return f->has_error;
 371 }
 372
 373 void qemu_file_set_error(QEMUFile *f)
 374 {
 375     f->has_error = 1;
 376 }
 377
 378 void qemu_fflush(QEMUFile *f)
 379 {
 380     if (!f->put_buffer)
 381         return;
 382
 383     if (f->is_write && f->buf_index > 0) {
 384         int len;
 385
 386         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 387         if (len > 0)
 388             f->buf_offset += f->buf_index;
 389         else
 390             f->has_error = 1;
 391         f->buf_index = 0;
 392     }
 393 }
 394
 395 static void qemu_fill_buffer(QEMUFile *f)
 396 {
 397     int len;
 398
 399     if (!f->get_buffer)
 400         return;
 401
 402     if (f->is_write)
 403         abort();
 404
 405     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 406     if (len > 0) {
 407         f->buf_index = 0;
 408         f->buf_size = len;
 409         f->buf_offset += len;
 410     } else if (len != -EAGAIN)
 411         f->has_error = 1;
 412 }
 413
 414 int qemu_fclose(QEMUFile *f)
 415 {
 416     int ret = 0;
 417     qemu_fflush(f);
 418     if (f->close)
 419         ret = f->close(f->opaque);
 420     qemu_free(f);
 421     return ret;
 422 }
 423
 424 void qemu_file_put_notify(QEMUFile *f)
 425 {
 426     f->put_buffer(f->opaque, NULL, 0, 0);
 427 }
 428
 429 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 430 {
 431     int l;
 432
 433     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 434         fprintf(stderr,
 435                 "Attempted to write to buffer while read buffer is not empty\n");
 436         abort();
 437     }
 438
 439     while (!f->has_error && size > 0) {
 440         l = IO_BUF_SIZE - f->buf_index;
 441         if (l > size)
 442             l = size;
 443         memcpy(f->buf + f->buf_index, buf, l);
 444         f->is_write = 1;
 445         f->buf_index += l;
 446         buf += l;
 447         size -= l;
 448         if (f->buf_index >= IO_BUF_SIZE)
 449             qemu_fflush(f);
 450     }
 451 }
 452
 453 void qemu_put_byte(QEMUFile *f, int v)
 454 {
 455     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 456         fprintf(stderr,
 457                 "Attempted to write to buffer while read buffer is not empty\n");
 458         abort();
 459     }
 460
 461     f->buf[f->buf_index++] = v;
 462     f->is_write = 1;
 463     if (f->buf_index >= IO_BUF_SIZE)
 464         qemu_fflush(f);
 465 }
 466
 467 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 468 {
 469     int size, l;
 470
 471     if (f->is_write)
 472         abort();
 473
 474     size = size1;
 475     while (size > 0) {
 476         l = f->buf_size - f->buf_index;
 477         if (l == 0) {
 478             qemu_fill_buffer(f);
 479             l = f->buf_size - f->buf_index;
 480             if (l == 0)
 481                 break;
 482         }
 483         if (l > size)
 484             l = size;
 485         memcpy(buf, f->buf + f->buf_index, l);
 486         f->buf_index += l;
 487         buf += l;
 488         size -= l;
 489     }
 490     return size1 - size;
 491 }
 492
 493 int qemu_get_byte(QEMUFile *f)
 494 {
 495     if (f->is_write)
 496         abort();
 497
 498     if (f->buf_index >= f->buf_size) {
 499         qemu_fill_buffer(f);
 500         if (f->buf_index >= f->buf_size)
 501             return 0;
 502     }
 503     return f->buf[f->buf_index++];
 504 }
 505
 506 int64_t qemu_ftell(QEMUFile *f)
 507 {
 508     return f->buf_offset - f->buf_size + f->buf_index;
 509 }
 510
 511 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 512 {
 513     if (whence == SEEK_SET) {
 514         /* nothing to do */
 515     } else if (whence == SEEK_CUR) {
 516         pos += qemu_ftell(f);
 517     } else {
 518         /* SEEK_END not supported */
 519         return -1;
 520     }
 521     if (f->put_buffer) {
 522         qemu_fflush(f);
 523         f->buf_offset = pos;
 524     } else {
 525         f->buf_offset = pos;
 526         f->buf_index = 0;
 527         f->buf_size = 0;
 528     }
 529     return pos;
 530 }
 531
 532 int qemu_file_rate_limit(QEMUFile *f)
 533 {
 534     if (f->rate_limit)
 535         return f->rate_limit(f->opaque);
 536
 537     return 0;
 538 }
 539
 540 void qemu_put_be16(QEMUFile *f, unsigned int v)
 541 {
 542     qemu_put_byte(f, v >> 8);
 543     qemu_put_byte(f, v);
 544 }
 545
 546 void qemu_put_be32(QEMUFile *f, unsigned int v)
 547 {
 548     qemu_put_byte(f, v >> 24);
 549     qemu_put_byte(f, v >> 16);
 550     qemu_put_byte(f, v >> 8);
 551     qemu_put_byte(f, v);
 552 }
 553
 554 void qemu_put_be64(QEMUFile *f, uint64_t v)
 555 {
 556     qemu_put_be32(f, v >> 32);
 557     qemu_put_be32(f, v);
 558 }
 559
 560 unsigned int qemu_get_be16(QEMUFile *f)
 561 {
 562     unsigned int v;
 563     v = qemu_get_byte(f) << 8;
 564     v |= qemu_get_byte(f);
 565     return v;
 566 }
 567
 568 unsigned int qemu_get_be32(QEMUFile *f)
 569 {
 570     unsigned int v;
 571     v = qemu_get_byte(f) << 24;
 572     v |= qemu_get_byte(f) << 16;
 573     v |= qemu_get_byte(f) << 8;
 574     v |= qemu_get_byte(f);
 575     return v;
 576 }
 577
 578 uint64_t qemu_get_be64(QEMUFile *f)
 579 {
 580     uint64_t v;
 581     v = (uint64_t)qemu_get_be32(f) << 32;
 582     v |= qemu_get_be32(f);
 583     return v;
 584 }
 585
 586 typedef struct SaveStateEntry {
 587     char idstr[256];
 588     int instance_id;
 589     int version_id;
 590     int section_id;
 591     SaveLiveStateHandler *save_live_state;
 592     SaveStateHandler *save_state;
 593     LoadStateHandler *load_state;
 594     void *opaque;
 595     struct SaveStateEntry *next;
 596 } SaveStateEntry;
 597
 598 static SaveStateEntry *first_se;
 599
 600 /* TODO: Individual devices generally have very little idea about the rest
 601    of the system, so instance_id should be removed/replaced.
 602    Meanwhile pass -1 as instance_id if you do not already have a clearly
 603    distinguishing id for all instances of your device class. */
 604 int register_savevm_live(const char *idstr,
 605                          int instance_id,
 606                          int version_id,
 607                          SaveLiveStateHandler *save_live_state,
 608                          SaveStateHandler *save_state,
 609                          LoadStateHandler *load_state,
 610                          void *opaque)
 611 {
 612     SaveStateEntry *se, **pse;
 613     static int global_section_id;
 614
 615     se = qemu_malloc(sizeof(SaveStateEntry));
 616     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
 617     se->instance_id = (instance_id == -1) ? 0 : instance_id;
 618     se->version_id = version_id;
 619     se->section_id = global_section_id++;
 620     se->save_live_state = save_live_state;
 621     se->save_state = save_state;
 622     se->load_state = load_state;
 623     se->opaque = opaque;
 624     se->next = NULL;
 625
 626     /* add at the end of list */
 627     pse = &first_se;
 628     while (*pse != NULL) {
 629         if (instance_id == -1
 630                 && strcmp(se->idstr, (*pse)->idstr) == 0
 631                 && se->instance_id <= (*pse)->instance_id)
 632             se->instance_id = (*pse)->instance_id + 1;
 633         pse = &(*pse)->next;
 634     }
 635     *pse = se;
 636     return 0;
 637 }
 638
 639 int register_savevm(const char *idstr,
 640                     int instance_id,
 641                     int version_id,
 642                     SaveStateHandler *save_state,
 643                     LoadStateHandler *load_state,
 644                     void *opaque)
 645 {
 646     return register_savevm_live(idstr, instance_id, version_id,
 647                                 NULL, save_state, load_state, opaque);
 648 }
 649
 650 void unregister_savevm(const char *idstr, void *opaque)
 651 {
 652     SaveStateEntry **pse;
 653
 654     pse = &first_se;
 655     while (*pse != NULL) {
 656         if (strcmp((*pse)->idstr, idstr) == 0 && (*pse)->opaque == opaque) {
 657             SaveStateEntry *next = (*pse)->next;
 658             qemu_free(*pse);
 659             *pse = next;
 660             continue;
 661         }
 662         pse = &(*pse)->next;
 663     }
 664 }
 665
 666 #define QEMU_VM_FILE_MAGIC           0x5145564d
 667 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
 668 #define QEMU_VM_FILE_VERSION         0x00000003
 669
 670 #define QEMU_VM_EOF                  0x00
 671 #define QEMU_VM_SECTION_START        0x01
 672 #define QEMU_VM_SECTION_PART         0x02
 673 #define QEMU_VM_SECTION_END          0x03
 674 #define QEMU_VM_SECTION_FULL         0x04
 675
 676 int qemu_savevm_state_begin(QEMUFile *f)
 677 {
 678     SaveStateEntry *se;
 679
 680     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
 681     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
 682
 683     for (se = first_se; se != NULL; se = se->next) {
 684         int len;
 685
 686         if (se->save_live_state == NULL)
 687             continue;
 688
 689         /* Section type */
 690         qemu_put_byte(f, QEMU_VM_SECTION_START);
 691         qemu_put_be32(f, se->section_id);
 692
 693         /* ID string */
 694         len = strlen(se->idstr);
 695         qemu_put_byte(f, len);
 696         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 697
 698         qemu_put_be32(f, se->instance_id);
 699         qemu_put_be32(f, se->version_id);
 700
 701         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
 702     }
 703
 704     if (qemu_file_has_error(f))
 705         return -EIO;
 706
 707     return 0;
 708 }
 709
 710 int qemu_savevm_state_iterate(QEMUFile *f)
 711 {
 712     SaveStateEntry *se;
 713     int ret = 1;
 714
 715     for (se = first_se; se != NULL; se = se->next) {
 716         if (se->save_live_state == NULL)
 717             continue;
 718
 719         /* Section type */
 720         qemu_put_byte(f, QEMU_VM_SECTION_PART);
 721         qemu_put_be32(f, se->section_id);
 722
 723         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
 724     }
 725
 726     if (ret)
 727         return 1;
 728
 729     if (qemu_file_has_error(f))
 730         return -EIO;
 731
 732     return 0;
 733 }
 734
 735 int qemu_savevm_state_complete(QEMUFile *f)
 736 {
 737     SaveStateEntry *se;
 738
 739     for (se = first_se; se != NULL; se = se->next) {
 740         if (se->save_live_state == NULL)
 741             continue;
 742
 743         /* Section type */
 744         qemu_put_byte(f, QEMU_VM_SECTION_END);
 745         qemu_put_be32(f, se->section_id);
 746
 747         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
 748     }
 749
 750     for(se = first_se; se != NULL; se = se->next) {
 751         int len;
 752
 753         if (se->save_state == NULL)
 754             continue;
 755
 756         /* Section type */
 757         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
 758         qemu_put_be32(f, se->section_id);
 759
 760         /* ID string */
 761         len = strlen(se->idstr);
 762         qemu_put_byte(f, len);
 763         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 764
 765         qemu_put_be32(f, se->instance_id);
 766         qemu_put_be32(f, se->version_id);
 767
 768         se->save_state(f, se->opaque);
 769     }
 770
 771     qemu_put_byte(f, QEMU_VM_EOF);
 772
 773     if (qemu_file_has_error(f))
 774         return -EIO;
 775
 776     return 0;
 777 }
 778
 779 int qemu_savevm_state(QEMUFile *f)
 780 {
 781     int saved_vm_running;
 782     int ret;
 783
 784     saved_vm_running = vm_running;
 785     vm_stop(0);
 786
 787     bdrv_flush_all();
 788
 789     ret = qemu_savevm_state_begin(f);
 790     if (ret < 0)
 791         goto out;
 792
 793     do {
 794         ret = qemu_savevm_state_iterate(f);
 795         if (ret < 0)
 796             goto out;
 797     } while (ret == 0);
 798
 799     ret = qemu_savevm_state_complete(f);
 800
 801 out:
 802     if (qemu_file_has_error(f))
 803         ret = -EIO;
 804
 805     if (!ret && saved_vm_running)
 806         vm_start();
 807
 808     return ret;
 809 }
 810
 811 static SaveStateEntry *find_se(const char *idstr, int instance_id)
 812 {
 813     SaveStateEntry *se;
 814
 815     for(se = first_se; se != NULL; se = se->next) {
 816         if (!strcmp(se->idstr, idstr) &&
 817             instance_id == se->instance_id)
 818             return se;
 819     }
 820     return NULL;
 821 }
 822
 823 typedef struct LoadStateEntry {
 824     SaveStateEntry *se;
 825     int section_id;
 826     int version_id;
 827     struct LoadStateEntry *next;
 828 } LoadStateEntry;
 829
 830 static int qemu_loadvm_state_v2(QEMUFile *f)
 831 {
 832     SaveStateEntry *se;
 833     int len, ret, instance_id, record_len, version_id;
 834     int64_t total_len, end_pos, cur_pos;
 835     char idstr[256];
 836
 837     total_len = qemu_get_be64(f);
 838     end_pos = total_len + qemu_ftell(f);
 839     for(;;) {
 840         if (qemu_ftell(f) >= end_pos)
 841             break;
 842         len = qemu_get_byte(f);
 843         qemu_get_buffer(f, (uint8_t *)idstr, len);
 844         idstr[len] = '\0';
 845         instance_id = qemu_get_be32(f);
 846         version_id = qemu_get_be32(f);
 847         record_len = qemu_get_be32(f);
 848         cur_pos = qemu_ftell(f);
 849         se = find_se(idstr, instance_id);
 850         if (!se) {
 851             fprintf(stderr, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n",
 852                     instance_id, idstr);
 853         } else {
 854             ret = se->load_state(f, se->opaque, version_id);
 855             if (ret < 0) {
 856                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
 857                         instance_id, idstr);
 858                 return ret;
 859             }
 860         }
 861         /* always seek to exact end of record */
 862         qemu_fseek(f, cur_pos + record_len, SEEK_SET);
 863     }
 864
 865     if (qemu_file_has_error(f))
 866         return -EIO;
 867
 868     return 0;
 869 }
 870
 871 int qemu_loadvm_state(QEMUFile *f)
 872 {
 873     LoadStateEntry *first_le = NULL;
 874     uint8_t section_type;
 875     unsigned int v;
 876     int ret;
 877
 878     v = qemu_get_be32(f);
 879     if (v != QEMU_VM_FILE_MAGIC)
 880         return -EINVAL;
 881
 882     v = qemu_get_be32(f);
 883     if (v == QEMU_VM_FILE_VERSION_COMPAT)
 884         return qemu_loadvm_state_v2(f);
 885     if (v != QEMU_VM_FILE_VERSION)
 886         return -ENOTSUP;
 887
 888     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
 889         uint32_t instance_id, version_id, section_id;
 890         LoadStateEntry *le;
 891         SaveStateEntry *se;
 892         char idstr[257];
 893         int len;
 894
 895         switch (section_type) {
 896         case QEMU_VM_SECTION_START:
 897         case QEMU_VM_SECTION_FULL:
 898             /* Read section start */
 899             section_id = qemu_get_be32(f);
 900             len = qemu_get_byte(f);
 901             qemu_get_buffer(f, (uint8_t *)idstr, len);
 902             idstr[len] = 0;
 903             instance_id = qemu_get_be32(f);
 904             version_id = qemu_get_be32(f);
 905
 906             /* Find savevm section */
 907             se = find_se(idstr, instance_id);
 908             if (se == NULL) {
 909                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
 910                 ret = -EINVAL;
 911                 goto out;
 912             }
 913
 914             /* Validate version */
 915             if (version_id > se->version_id) {
 916                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
 917                         version_id, idstr, se->version_id);
 918                 ret = -EINVAL;
 919                 goto out;
 920             }
 921
 922             /* Add entry */
 923             le = qemu_mallocz(sizeof(*le));
 924
 925             le->se = se;
 926             le->section_id = section_id;
 927             le->version_id = version_id;
 928             le->next = first_le;
 929             first_le = le;
 930
 931             le->se->load_state(f, le->se->opaque, le->version_id);
 932             break;
 933         case QEMU_VM_SECTION_PART:
 934         case QEMU_VM_SECTION_END:
 935             section_id = qemu_get_be32(f);
 936
 937             for (le = first_le; le && le->section_id != section_id; le = le->next);
 938             if (le == NULL) {
 939                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
 940                 ret = -EINVAL;
 941                 goto out;
 942             }
 943
 944             le->se->load_state(f, le->se->opaque, le->version_id);
 945             break;
 946         default:
 947             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
 948             ret = -EINVAL;
 949             goto out;
 950         }
 951     }
 952
 953     ret = 0;
 954
 955 out:
 956     while (first_le) {
 957         LoadStateEntry *le = first_le;
 958         first_le = first_le->next;
 959         qemu_free(le);
 960     }
 961
 962     if (qemu_file_has_error(f))
 963         ret = -EIO;
 964
 965     return ret;
 966 }
 967
 968 /* device can contain snapshots */
 969 static int bdrv_can_snapshot(BlockDriverState *bs)
 970 {
 971     return (bs &&
 972             !bdrv_is_removable(bs) &&
 973             !bdrv_is_read_only(bs));
 974 }
 975
 976 /* device must be snapshots in order to have a reliable snapshot */
 977 static int bdrv_has_snapshot(BlockDriverState *bs)
 978 {
 979     return (bs &&
 980             !bdrv_is_removable(bs) &&
 981             !bdrv_is_read_only(bs));
 982 }
 983
 984 static BlockDriverState *get_bs_snapshots(void)
 985 {
 986     BlockDriverState *bs;
 987     int i;
 988
 989     if (bs_snapshots)
 990         return bs_snapshots;
 991     for(i = 0; i <= nb_drives; i++) {
 992         bs = drives_table[i].bdrv;
 993         if (bdrv_can_snapshot(bs))
 994             goto ok;
 995     }
 996     return NULL;
 997  ok:
 998     bs_snapshots = bs;
 999     return bs;
1000 }
1001
1002 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1003                               const char *name)
1004 {
1005     QEMUSnapshotInfo *sn_tab, *sn;
1006     int nb_sns, i, ret;
1007
1008     ret = -ENOENT;
1009     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1010     if (nb_sns < 0)
1011         return ret;
1012     for(i = 0; i < nb_sns; i++) {
1013         sn = &sn_tab[i];
1014         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1015             *sn_info = *sn;
1016             ret = 0;
1017             break;
1018         }
1019     }
1020     qemu_free(sn_tab);
1021     return ret;
1022 }
1023
1024 void do_savevm(Monitor *mon, const char *name)
1025 {
1026     BlockDriverState *bs, *bs1;
1027     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1028     int must_delete, ret, i;
1029     BlockDriverInfo bdi1, *bdi = &bdi1;
1030     QEMUFile *f;
1031     int saved_vm_running;
1032     uint32_t vm_state_size;
1033 #ifdef _WIN32
1034     struct _timeb tb;
1035 #else
1036     struct timeval tv;
1037 #endif
1038
1039     bs = get_bs_snapshots();
1040     if (!bs) {
1041         monitor_printf(mon, "No block device can accept snapshots\n");
1042         return;
1043     }
1044
1045     /* ??? Should this occur after vm_stop?  */
1046     qemu_aio_flush();
1047
1048     saved_vm_running = vm_running;
1049     vm_stop(0);
1050
1051     must_delete = 0;
1052     if (name) {
1053         ret = bdrv_snapshot_find(bs, old_sn, name);
1054         if (ret >= 0) {
1055             must_delete = 1;
1056         }
1057     }
1058     memset(sn, 0, sizeof(*sn));
1059     if (must_delete) {
1060         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1061         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1062     } else {
1063         if (name)
1064             pstrcpy(sn->name, sizeof(sn->name), name);
1065     }
1066
1067     /* fill auxiliary fields */
1068 #ifdef _WIN32
1069     _ftime(&tb);
1070     sn->date_sec = tb.time;
1071     sn->date_nsec = tb.millitm * 1000000;
1072 #else
1073     gettimeofday(&tv, NULL);
1074     sn->date_sec = tv.tv_sec;
1075     sn->date_nsec = tv.tv_usec * 1000;
1076 #endif
1077     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1078
1079     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
1080         monitor_printf(mon, "Device %s does not support VM state snapshots\n",
1081                        bdrv_get_device_name(bs));
1082         goto the_end;
1083     }
1084
1085     /* save the VM state */
1086     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 1);
1087     if (!f) {
1088         monitor_printf(mon, "Could not open VM state file\n");
1089         goto the_end;
1090     }
1091     ret = qemu_savevm_state(f);
1092     vm_state_size = qemu_ftell(f);
1093     qemu_fclose(f);
1094     if (ret < 0) {
1095         monitor_printf(mon, "Error %d while writing VM\n", ret);
1096         goto the_end;
1097     }
1098
1099     /* create the snapshots */
1100
1101     for(i = 0; i < nb_drives; i++) {
1102         bs1 = drives_table[i].bdrv;
1103         if (bdrv_has_snapshot(bs1)) {
1104             if (must_delete) {
1105                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1106                 if (ret < 0) {
1107                     monitor_printf(mon,
1108                                    "Error while deleting snapshot on '%s'\n",
1109                                    bdrv_get_device_name(bs1));
1110                 }
1111             }
1112             /* Write VM state size only to the image that contains the state */
1113             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1114             ret = bdrv_snapshot_create(bs1, sn);
1115             if (ret < 0) {
1116                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1117                                bdrv_get_device_name(bs1));
1118             }
1119         }
1120     }
1121
1122  the_end:
1123     if (saved_vm_running)
1124         vm_start();
1125 }
1126
1127 void do_loadvm(Monitor *mon, const char *name)
1128 {
1129     BlockDriverState *bs, *bs1;
1130     BlockDriverInfo bdi1, *bdi = &bdi1;
1131     QEMUSnapshotInfo sn;
1132     QEMUFile *f;
1133     int i, ret;
1134     int saved_vm_running;
1135
1136     bs = get_bs_snapshots();
1137     if (!bs) {
1138         monitor_printf(mon, "No block device supports snapshots\n");
1139         return;
1140     }
1141
1142     /* Flush all IO requests so they don't interfere with the new state.  */
1143     qemu_aio_flush();
1144
1145     saved_vm_running = vm_running;
1146     vm_stop(0);
1147
1148     for(i = 0; i <= nb_drives; i++) {
1149         bs1 = drives_table[i].bdrv;
1150         if (bdrv_has_snapshot(bs1)) {
1151             ret = bdrv_snapshot_goto(bs1, name);
1152             if (ret < 0) {
1153                 if (bs != bs1)
1154                     monitor_printf(mon, "Warning: ");
1155                 switch(ret) {
1156                 case -ENOTSUP:
1157                     monitor_printf(mon,
1158                                    "Snapshots not supported on device '%s'\n",
1159                                    bdrv_get_device_name(bs1));
1160                     break;
1161                 case -ENOENT:
1162                     monitor_printf(mon, "Could not find snapshot '%s' on "
1163                                    "device '%s'\n",
1164                                    name, bdrv_get_device_name(bs1));
1165                     break;
1166                 default:
1167                     monitor_printf(mon, "Error %d while activating snapshot on"
1168                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1169                     break;
1170                 }
1171                 /* fatal on snapshot block device */
1172                 if (bs == bs1)
1173                     goto the_end;
1174             }
1175         }
1176     }
1177
1178     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
1179         monitor_printf(mon, "Device %s does not support VM state snapshots\n",
1180                        bdrv_get_device_name(bs));
1181         return;
1182     }
1183
1184     /* Don't even try to load empty VM states */
1185     ret = bdrv_snapshot_find(bs, &sn, name);
1186     if ((ret >= 0) && (sn.vm_state_size == 0))
1187         goto the_end;
1188
1189     /* restore the VM state */
1190     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 0);
1191     if (!f) {
1192         monitor_printf(mon, "Could not open VM state file\n");
1193         goto the_end;
1194     }
1195     ret = qemu_loadvm_state(f);
1196     qemu_fclose(f);
1197     if (ret < 0) {
1198         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1199     }
1200  the_end:
1201     if (saved_vm_running)
1202         vm_start();
1203 }
1204
1205 void do_delvm(Monitor *mon, const char *name)
1206 {
1207     BlockDriverState *bs, *bs1;
1208     int i, ret;
1209
1210     bs = get_bs_snapshots();
1211     if (!bs) {
1212         monitor_printf(mon, "No block device supports snapshots\n");
1213         return;
1214     }
1215
1216     for(i = 0; i <= nb_drives; i++) {
1217         bs1 = drives_table[i].bdrv;
1218         if (bdrv_has_snapshot(bs1)) {
1219             ret = bdrv_snapshot_delete(bs1, name);
1220             if (ret < 0) {
1221                 if (ret == -ENOTSUP)
1222                     monitor_printf(mon,
1223                                    "Snapshots not supported on device '%s'\n",
1224                                    bdrv_get_device_name(bs1));
1225                 else
1226                     monitor_printf(mon, "Error %d while deleting snapshot on "
1227                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1228             }
1229         }
1230     }
1231 }
1232
1233 void do_info_snapshots(Monitor *mon)
1234 {
1235     BlockDriverState *bs, *bs1;
1236     QEMUSnapshotInfo *sn_tab, *sn;
1237     int nb_sns, i;
1238     char buf[256];
1239
1240     bs = get_bs_snapshots();
1241     if (!bs) {
1242         monitor_printf(mon, "No available block device supports snapshots\n");
1243         return;
1244     }
1245     monitor_printf(mon, "Snapshot devices:");
1246     for(i = 0; i <= nb_drives; i++) {
1247         bs1 = drives_table[i].bdrv;
1248         if (bdrv_has_snapshot(bs1)) {
1249             if (bs == bs1)
1250                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1251         }
1252     }
1253     monitor_printf(mon, "\n");
1254
1255     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1256     if (nb_sns < 0) {
1257         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1258         return;
1259     }
1260     monitor_printf(mon, "Snapshot list (from %s):\n",
1261                    bdrv_get_device_name(bs));
1262     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1263     for(i = 0; i < nb_sns; i++) {
1264         sn = &sn_tab[i];
1265         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1266     }
1267     qemu_free(sn_tab);
1268 }