migration/vmstate.c

   1 #include "qemu-common.h"
   2 #include "migration/migration.h"
   3 #include "migration/qemu-file.h"
   4 #include "migration/vmstate.h"
   5 #include "qemu/bitops.h"
   6 #include "qemu/error-report.h"
   7 #include "trace.h"
   8 #include "qjson.h"
   9
  10 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
  11                                     void *opaque, QJSON *vmdesc);
  12 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
  13                                    void *opaque);
  14
  15 static int vmstate_n_elems(void *opaque, VMStateField *field)
  16 {
  17     int n_elems = 1;
  18
  19     if (field->flags & VMS_ARRAY) {
  20         n_elems = field->num;
  21     } else if (field->flags & VMS_VARRAY_INT32) {
  22         n_elems = *(int32_t *)(opaque+field->num_offset);
  23     } else if (field->flags & VMS_VARRAY_UINT32) {
  24         n_elems = *(uint32_t *)(opaque+field->num_offset);
  25     } else if (field->flags & VMS_VARRAY_UINT16) {
  26         n_elems = *(uint16_t *)(opaque+field->num_offset);
  27     } else if (field->flags & VMS_VARRAY_UINT8) {
  28         n_elems = *(uint8_t *)(opaque+field->num_offset);
  29     }
  30
  31     return n_elems;
  32 }
  33
  34 static int vmstate_size(void *opaque, VMStateField *field)
  35 {
  36     int size = field->size;
  37
  38     if (field->flags & VMS_VBUFFER) {
  39         size = *(int32_t *)(opaque+field->size_offset);
  40         if (field->flags & VMS_MULTIPLY) {
  41             size *= field->size;
  42         }
  43     }
  44
  45     return size;
  46 }
  47
  48 static void *vmstate_base_addr(void *opaque, VMStateField *field, bool alloc)
  49 {
  50     void *base_addr = opaque + field->offset;
  51
  52     if (field->flags & VMS_POINTER) {
  53         if (alloc && (field->flags & VMS_ALLOC)) {
  54             gsize size = 0;
  55             if (field->flags & VMS_VBUFFER) {
  56                 size = vmstate_size(opaque, field);
  57             } else {
  58                 int n_elems = vmstate_n_elems(opaque, field);
  59                 if (n_elems) {
  60                     size = n_elems * field->size;
  61                 }
  62             }
  63             if (size) {
  64                 *((void **)base_addr + field->start) = g_malloc(size);
  65             }
  66         }
  67         base_addr = *(void **)base_addr + field->start;
  68     }
  69
  70     return base_addr;
  71 }
  72
  73 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
  74                        void *opaque, int version_id)
  75 {
  76     VMStateField *field = vmsd->fields;
  77     int ret = 0;
  78
  79     trace_vmstate_load_state(vmsd->name, version_id);
  80     if (version_id > vmsd->version_id) {
  81         trace_vmstate_load_state_end(vmsd->name, "too new", -EINVAL);
  82         return -EINVAL;
  83     }
  84     if  (version_id < vmsd->minimum_version_id) {
  85         if (vmsd->load_state_old &&
  86             version_id >= vmsd->minimum_version_id_old) {
  87             ret = vmsd->load_state_old(f, opaque, version_id);
  88             trace_vmstate_load_state_end(vmsd->name, "old path", ret);
  89             return ret;
  90         }
  91         trace_vmstate_load_state_end(vmsd->name, "too old", -EINVAL);
  92         return -EINVAL;
  93     }
  94     if (vmsd->pre_load) {
  95         int ret = vmsd->pre_load(opaque);
  96         if (ret) {
  97             return ret;
  98         }
  99     }
 100     while (field->name) {
 101         trace_vmstate_load_state_field(vmsd->name, field->name);
 102         if ((field->field_exists &&
 103              field->field_exists(opaque, version_id)) ||
 104             (!field->field_exists &&
 105              field->version_id <= version_id)) {
 106             void *base_addr = vmstate_base_addr(opaque, field, true);
 107             int i, n_elems = vmstate_n_elems(opaque, field);
 108             int size = vmstate_size(opaque, field);
 109
 110             for (i = 0; i < n_elems; i++) {
 111                 void *addr = base_addr + size * i;
 112
 113                 if (field->flags & VMS_ARRAY_OF_POINTER) {
 114                     addr = *(void **)addr;
 115                 }
 116                 if (field->flags & VMS_STRUCT) {
 117                     ret = vmstate_load_state(f, field->vmsd, addr,
 118                                              field->vmsd->version_id);
 119                 } else {
 120                     ret = field->info->get(f, addr, size);
 121
 122                 }
 123                 if (ret >= 0) {
 124                     ret = qemu_file_get_error(f);
 125                 }
 126                 if (ret < 0) {
 127                     qemu_file_set_error(f, ret);
 128                     trace_vmstate_load_field_error(field->name, ret);
 129                     return ret;
 130                 }
 131             }
 132         } else if (field->flags & VMS_MUST_EXIST) {
 133             error_report("Input validation failed: %s/%s",
 134                          vmsd->name, field->name);
 135             return -1;
 136         }
 137         field++;
 138     }
 139     ret = vmstate_subsection_load(f, vmsd, opaque);
 140     if (ret != 0) {
 141         return ret;
 142     }
 143     if (vmsd->post_load) {
 144         ret = vmsd->post_load(opaque, version_id);
 145     }
 146     trace_vmstate_load_state_end(vmsd->name, "end", ret);
 147     return ret;
 148 }
 149
 150 static int vmfield_name_num(VMStateField *start, VMStateField *search)
 151 {
 152     VMStateField *field;
 153     int found = 0;
 154
 155     for (field = start; field->name; field++) {
 156         if (!strcmp(field->name, search->name)) {
 157             if (field == search) {
 158                 return found;
 159             }
 160             found++;
 161         }
 162     }
 163
 164     return -1;
 165 }
 166
 167 static bool vmfield_name_is_unique(VMStateField *start, VMStateField *search)
 168 {
 169     VMStateField *field;
 170     int found = 0;
 171
 172     for (field = start; field->name; field++) {
 173         if (!strcmp(field->name, search->name)) {
 174             found++;
 175             /* name found more than once, so it's not unique */
 176             if (found > 1) {
 177                 return false;
 178             }
 179         }
 180     }
 181
 182     return true;
 183 }
 184
 185 static const char *vmfield_get_type_name(VMStateField *field)
 186 {
 187     const char *type = "unknown";
 188
 189     if (field->flags & VMS_STRUCT) {
 190         type = "struct";
 191     } else if (field->info->name) {
 192         type = field->info->name;
 193     }
 194
 195     return type;
 196 }
 197
 198 static bool vmsd_can_compress(VMStateField *field)
 199 {
 200     if (field->field_exists) {
 201         /* Dynamically existing fields mess up compression */
 202         return false;
 203     }
 204
 205     if (field->flags & VMS_STRUCT) {
 206         VMStateField *sfield = field->vmsd->fields;
 207         while (sfield->name) {
 208             if (!vmsd_can_compress(sfield)) {
 209                 /* Child elements can't compress, so can't we */
 210                 return false;
 211             }
 212             sfield++;
 213         }
 214
 215         if (field->vmsd->subsections) {
 216             /* Subsections may come and go, better don't compress */
 217             return false;
 218         }
 219     }
 220
 221     return true;
 222 }
 223
 224 static void vmsd_desc_field_start(const VMStateDescription *vmsd, QJSON *vmdesc,
 225                                   VMStateField *field, int i, int max)
 226 {
 227     char *name, *old_name;
 228     bool is_array = max > 1;
 229     bool can_compress = vmsd_can_compress(field);
 230
 231     if (!vmdesc) {
 232         return;
 233     }
 234
 235     name = g_strdup(field->name);
 236
 237     /* Field name is not unique, need to make it unique */
 238     if (!vmfield_name_is_unique(vmsd->fields, field)) {
 239         int num = vmfield_name_num(vmsd->fields, field);
 240         old_name = name;
 241         name = g_strdup_printf("%s[%d]", name, num);
 242         g_free(old_name);
 243     }
 244
 245     json_start_object(vmdesc, NULL);
 246     json_prop_str(vmdesc, "name", name);
 247     if (is_array) {
 248         if (can_compress) {
 249             json_prop_int(vmdesc, "array_len", max);
 250         } else {
 251             json_prop_int(vmdesc, "index", i);
 252         }
 253     }
 254     json_prop_str(vmdesc, "type", vmfield_get_type_name(field));
 255
 256     if (field->flags & VMS_STRUCT) {
 257         json_start_object(vmdesc, "struct");
 258     }
 259
 260     g_free(name);
 261 }
 262
 263 static void vmsd_desc_field_end(const VMStateDescription *vmsd, QJSON *vmdesc,
 264                                 VMStateField *field, size_t size, int i)
 265 {
 266     if (!vmdesc) {
 267         return;
 268     }
 269
 270     if (field->flags & VMS_STRUCT) {
 271         /* We printed a struct in between, close its child object */
 272         json_end_object(vmdesc);
 273     }
 274
 275     json_prop_int(vmdesc, "size", size);
 276     json_end_object(vmdesc);
 277 }
 278
 279 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
 280                         void *opaque, QJSON *vmdesc)
 281 {
 282     VMStateField *field = vmsd->fields;
 283
 284     if (vmsd->pre_save) {
 285         vmsd->pre_save(opaque);
 286     }
 287
 288     if (vmdesc) {
 289         json_prop_str(vmdesc, "vmsd_name", vmsd->name);
 290         json_prop_int(vmdesc, "version", vmsd->version_id);
 291         json_start_array(vmdesc, "fields");
 292     }
 293
 294     while (field->name) {
 295         if (!field->field_exists ||
 296             field->field_exists(opaque, vmsd->version_id)) {
 297             void *base_addr = vmstate_base_addr(opaque, field, false);
 298             int i, n_elems = vmstate_n_elems(opaque, field);
 299             int size = vmstate_size(opaque, field);
 300             int64_t old_offset, written_bytes;
 301             QJSON *vmdesc_loop = vmdesc;
 302
 303             for (i = 0; i < n_elems; i++) {
 304                 void *addr = base_addr + size * i;
 305
 306                 vmsd_desc_field_start(vmsd, vmdesc_loop, field, i, n_elems);
 307                 old_offset = qemu_ftell_fast(f);
 308
 309                 if (field->flags & VMS_ARRAY_OF_POINTER) {
 310                     addr = *(void **)addr;
 311                 }
 312                 if (field->flags & VMS_STRUCT) {
 313                     vmstate_save_state(f, field->vmsd, addr, vmdesc_loop);
 314                 } else {
 315                     field->info->put(f, addr, size);
 316                 }
 317
 318                 written_bytes = qemu_ftell_fast(f) - old_offset;
 319                 vmsd_desc_field_end(vmsd, vmdesc_loop, field, written_bytes, i);
 320
 321                 /* Compressed arrays only care about the first element */
 322                 if (vmdesc_loop && vmsd_can_compress(field)) {
 323                     vmdesc_loop = NULL;
 324                 }
 325             }
 326         } else {
 327             if (field->flags & VMS_MUST_EXIST) {
 328                 error_report("Output state validation failed: %s/%s",
 329                         vmsd->name, field->name);
 330                 assert(!(field->flags & VMS_MUST_EXIST));
 331             }
 332         }
 333         field++;
 334     }
 335
 336     if (vmdesc) {
 337         json_end_array(vmdesc);
 338     }
 339
 340     vmstate_subsection_save(f, vmsd, opaque, vmdesc);
 341 }
 342
 343 static const VMStateDescription *
 344     vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
 345 {
 346     while (sub && sub->needed) {
 347         if (strcmp(idstr, sub->vmsd->name) == 0) {
 348             return sub->vmsd;
 349         }
 350         sub++;
 351     }
 352     return NULL;
 353 }
 354
 355 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
 356                                    void *opaque)
 357 {
 358     trace_vmstate_subsection_load(vmsd->name);
 359
 360     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
 361         char idstr[256];
 362         int ret;
 363         uint8_t version_id, len, size;
 364         const VMStateDescription *sub_vmsd;
 365
 366         len = qemu_peek_byte(f, 1);
 367         if (len < strlen(vmsd->name) + 1) {
 368             /* subsection name has be be "section_name/a" */
 369             trace_vmstate_subsection_load_bad(vmsd->name, "(short)");
 370             return 0;
 371         }
 372         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
 373         if (size != len) {
 374             trace_vmstate_subsection_load_bad(vmsd->name, "(peek fail)");
 375             return 0;
 376         }
 377         idstr[size] = 0;
 378
 379         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
 380             trace_vmstate_subsection_load_bad(vmsd->name, idstr);
 381             /* it don't have a valid subsection name */
 382             return 0;
 383         }
 384         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
 385         if (sub_vmsd == NULL) {
 386             trace_vmstate_subsection_load_bad(vmsd->name, "(lookup)");
 387             return -ENOENT;
 388         }
 389         qemu_file_skip(f, 1); /* subsection */
 390         qemu_file_skip(f, 1); /* len */
 391         qemu_file_skip(f, len); /* idstr */
 392         version_id = qemu_get_be32(f);
 393
 394         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
 395         if (ret) {
 396             trace_vmstate_subsection_load_bad(vmsd->name, "(child)");
 397             return ret;
 398         }
 399     }
 400
 401     trace_vmstate_subsection_load_good(vmsd->name);
 402     return 0;
 403 }
 404
 405 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
 406                                     void *opaque, QJSON *vmdesc)
 407 {
 408     const VMStateSubsection *sub = vmsd->subsections;
 409     bool subsection_found = false;
 410
 411     while (sub && sub->needed) {
 412         if (sub->needed(opaque)) {
 413             const VMStateDescription *vmsd = sub->vmsd;
 414             uint8_t len;
 415
 416             if (vmdesc) {
 417                 /* Only create subsection array when we have any */
 418                 if (!subsection_found) {
 419                     json_start_array(vmdesc, "subsections");
 420                     subsection_found = true;
 421                 }
 422
 423                 json_start_object(vmdesc, NULL);
 424             }
 425
 426             qemu_put_byte(f, QEMU_VM_SUBSECTION);
 427             len = strlen(vmsd->name);
 428             qemu_put_byte(f, len);
 429             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
 430             qemu_put_be32(f, vmsd->version_id);
 431             vmstate_save_state(f, vmsd, opaque, vmdesc);
 432
 433             if (vmdesc) {
 434                 json_end_object(vmdesc);
 435             }
 436         }
 437         sub++;
 438     }
 439
 440     if (vmdesc && subsection_found) {
 441         json_end_array(vmdesc);
 442     }
 443 }
 444
 445 /* bool */
 446
 447 static int get_bool(QEMUFile *f, void *pv, size_t size)
 448 {
 449     bool *v = pv;
 450     *v = qemu_get_byte(f);
 451     return 0;
 452 }
 453
 454 static void put_bool(QEMUFile *f, void *pv, size_t size)
 455 {
 456     bool *v = pv;
 457     qemu_put_byte(f, *v);
 458 }
 459
 460 const VMStateInfo vmstate_info_bool = {
 461     .name = "bool",
 462     .get  = get_bool,
 463     .put  = put_bool,
 464 };
 465
 466 /* 8 bit int */
 467
 468 static int get_int8(QEMUFile *f, void *pv, size_t size)
 469 {
 470     int8_t *v = pv;
 471     qemu_get_s8s(f, v);
 472     return 0;
 473 }
 474
 475 static void put_int8(QEMUFile *f, void *pv, size_t size)
 476 {
 477     int8_t *v = pv;
 478     qemu_put_s8s(f, v);
 479 }
 480
 481 const VMStateInfo vmstate_info_int8 = {
 482     .name = "int8",
 483     .get  = get_int8,
 484     .put  = put_int8,
 485 };
 486
 487 /* 16 bit int */
 488
 489 static int get_int16(QEMUFile *f, void *pv, size_t size)
 490 {
 491     int16_t *v = pv;
 492     qemu_get_sbe16s(f, v);
 493     return 0;
 494 }
 495
 496 static void put_int16(QEMUFile *f, void *pv, size_t size)
 497 {
 498     int16_t *v = pv;
 499     qemu_put_sbe16s(f, v);
 500 }
 501
 502 const VMStateInfo vmstate_info_int16 = {
 503     .name = "int16",
 504     .get  = get_int16,
 505     .put  = put_int16,
 506 };
 507
 508 /* 32 bit int */
 509
 510 static int get_int32(QEMUFile *f, void *pv, size_t size)
 511 {
 512     int32_t *v = pv;
 513     qemu_get_sbe32s(f, v);
 514     return 0;
 515 }
 516
 517 static void put_int32(QEMUFile *f, void *pv, size_t size)
 518 {
 519     int32_t *v = pv;
 520     qemu_put_sbe32s(f, v);
 521 }
 522
 523 const VMStateInfo vmstate_info_int32 = {
 524     .name = "int32",
 525     .get  = get_int32,
 526     .put  = put_int32,
 527 };
 528
 529 /* 32 bit int. See that the received value is the same than the one
 530    in the field */
 531
 532 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 533 {
 534     int32_t *v = pv;
 535     int32_t v2;
 536     qemu_get_sbe32s(f, &v2);
 537
 538     if (*v == v2) {
 539         return 0;
 540     }
 541     return -EINVAL;
 542 }
 543
 544 const VMStateInfo vmstate_info_int32_equal = {
 545     .name = "int32 equal",
 546     .get  = get_int32_equal,
 547     .put  = put_int32,
 548 };
 549
 550 /* 32 bit int. Check that the received value is non-negative
 551  * and less than or equal to the one in the field.
 552  */
 553
 554 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 555 {
 556     int32_t *cur = pv;
 557     int32_t loaded;
 558     qemu_get_sbe32s(f, &loaded);
 559
 560     if (loaded >= 0 && loaded <= *cur) {
 561         *cur = loaded;
 562         return 0;
 563     }
 564     return -EINVAL;
 565 }
 566
 567 const VMStateInfo vmstate_info_int32_le = {
 568     .name = "int32 le",
 569     .get  = get_int32_le,
 570     .put  = put_int32,
 571 };
 572
 573 /* 64 bit int */
 574
 575 static int get_int64(QEMUFile *f, void *pv, size_t size)
 576 {
 577     int64_t *v = pv;
 578     qemu_get_sbe64s(f, v);
 579     return 0;
 580 }
 581
 582 static void put_int64(QEMUFile *f, void *pv, size_t size)
 583 {
 584     int64_t *v = pv;
 585     qemu_put_sbe64s(f, v);
 586 }
 587
 588 const VMStateInfo vmstate_info_int64 = {
 589     .name = "int64",
 590     .get  = get_int64,
 591     .put  = put_int64,
 592 };
 593
 594 /* 8 bit unsigned int */
 595
 596 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 597 {
 598     uint8_t *v = pv;
 599     qemu_get_8s(f, v);
 600     return 0;
 601 }
 602
 603 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 604 {
 605     uint8_t *v = pv;
 606     qemu_put_8s(f, v);
 607 }
 608
 609 const VMStateInfo vmstate_info_uint8 = {
 610     .name = "uint8",
 611     .get  = get_uint8,
 612     .put  = put_uint8,
 613 };
 614
 615 /* 16 bit unsigned int */
 616
 617 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 618 {
 619     uint16_t *v = pv;
 620     qemu_get_be16s(f, v);
 621     return 0;
 622 }
 623
 624 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 625 {
 626     uint16_t *v = pv;
 627     qemu_put_be16s(f, v);
 628 }
 629
 630 const VMStateInfo vmstate_info_uint16 = {
 631     .name = "uint16",
 632     .get  = get_uint16,
 633     .put  = put_uint16,
 634 };
 635
 636 /* 32 bit unsigned int */
 637
 638 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 639 {
 640     uint32_t *v = pv;
 641     qemu_get_be32s(f, v);
 642     return 0;
 643 }
 644
 645 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 646 {
 647     uint32_t *v = pv;
 648     qemu_put_be32s(f, v);
 649 }
 650
 651 const VMStateInfo vmstate_info_uint32 = {
 652     .name = "uint32",
 653     .get  = get_uint32,
 654     .put  = put_uint32,
 655 };
 656
 657 /* 32 bit uint. See that the received value is the same than the one
 658    in the field */
 659
 660 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 661 {
 662     uint32_t *v = pv;
 663     uint32_t v2;
 664     qemu_get_be32s(f, &v2);
 665
 666     if (*v == v2) {
 667         return 0;
 668     }
 669     return -EINVAL;
 670 }
 671
 672 const VMStateInfo vmstate_info_uint32_equal = {
 673     .name = "uint32 equal",
 674     .get  = get_uint32_equal,
 675     .put  = put_uint32,
 676 };
 677
 678 /* 64 bit unsigned int */
 679
 680 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 681 {
 682     uint64_t *v = pv;
 683     qemu_get_be64s(f, v);
 684     return 0;
 685 }
 686
 687 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 688 {
 689     uint64_t *v = pv;
 690     qemu_put_be64s(f, v);
 691 }
 692
 693 const VMStateInfo vmstate_info_uint64 = {
 694     .name = "uint64",
 695     .get  = get_uint64,
 696     .put  = put_uint64,
 697 };
 698
 699 /* 64 bit unsigned int. See that the received value is the same than the one
 700    in the field */
 701
 702 static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
 703 {
 704     uint64_t *v = pv;
 705     uint64_t v2;
 706     qemu_get_be64s(f, &v2);
 707
 708     if (*v == v2) {
 709         return 0;
 710     }
 711     return -EINVAL;
 712 }
 713
 714 const VMStateInfo vmstate_info_uint64_equal = {
 715     .name = "int64 equal",
 716     .get  = get_uint64_equal,
 717     .put  = put_uint64,
 718 };
 719
 720 /* 8 bit int. See that the received value is the same than the one
 721    in the field */
 722
 723 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 724 {
 725     uint8_t *v = pv;
 726     uint8_t v2;
 727     qemu_get_8s(f, &v2);
 728
 729     if (*v == v2) {
 730         return 0;
 731     }
 732     return -EINVAL;
 733 }
 734
 735 const VMStateInfo vmstate_info_uint8_equal = {
 736     .name = "uint8 equal",
 737     .get  = get_uint8_equal,
 738     .put  = put_uint8,
 739 };
 740
 741 /* 16 bit unsigned int int. See that the received value is the same than the one
 742    in the field */
 743
 744 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 745 {
 746     uint16_t *v = pv;
 747     uint16_t v2;
 748     qemu_get_be16s(f, &v2);
 749
 750     if (*v == v2) {
 751         return 0;
 752     }
 753     return -EINVAL;
 754 }
 755
 756 const VMStateInfo vmstate_info_uint16_equal = {
 757     .name = "uint16 equal",
 758     .get  = get_uint16_equal,
 759     .put  = put_uint16,
 760 };
 761
 762 /* floating point */
 763
 764 static int get_float64(QEMUFile *f, void *pv, size_t size)
 765 {
 766     float64 *v = pv;
 767
 768     *v = make_float64(qemu_get_be64(f));
 769     return 0;
 770 }
 771
 772 static void put_float64(QEMUFile *f, void *pv, size_t size)
 773 {
 774     uint64_t *v = pv;
 775
 776     qemu_put_be64(f, float64_val(*v));
 777 }
 778
 779 const VMStateInfo vmstate_info_float64 = {
 780     .name = "float64",
 781     .get  = get_float64,
 782     .put  = put_float64,
 783 };
 784
 785 /* uint8_t buffers */
 786
 787 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 788 {
 789     uint8_t *v = pv;
 790     qemu_get_buffer(f, v, size);
 791     return 0;
 792 }
 793
 794 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 795 {
 796     uint8_t *v = pv;
 797     qemu_put_buffer(f, v, size);
 798 }
 799
 800 const VMStateInfo vmstate_info_buffer = {
 801     .name = "buffer",
 802     .get  = get_buffer,
 803     .put  = put_buffer,
 804 };
 805
 806 /* unused buffers: space that was used for some fields that are
 807    not useful anymore */
 808
 809 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 810 {
 811     uint8_t buf[1024];
 812     int block_len;
 813
 814     while (size > 0) {
 815         block_len = MIN(sizeof(buf), size);
 816         size -= block_len;
 817         qemu_get_buffer(f, buf, block_len);
 818     }
 819    return 0;
 820 }
 821
 822 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 823 {
 824     static const uint8_t buf[1024];
 825     int block_len;
 826
 827     while (size > 0) {
 828         block_len = MIN(sizeof(buf), size);
 829         size -= block_len;
 830         qemu_put_buffer(f, buf, block_len);
 831     }
 832 }
 833
 834 const VMStateInfo vmstate_info_unused_buffer = {
 835     .name = "unused_buffer",
 836     .get  = get_unused_buffer,
 837     .put  = put_unused_buffer,
 838 };
 839
 840 /* bitmaps (as defined by bitmap.h). Note that size here is the size
 841  * of the bitmap in bits. The on-the-wire format of a bitmap is 64
 842  * bit words with the bits in big endian order. The in-memory format
 843  * is an array of 'unsigned long', which may be either 32 or 64 bits.
 844  */
 845 /* This is the number of 64 bit words sent over the wire */
 846 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
 847 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
 848 {
 849     unsigned long *bmp = pv;
 850     int i, idx = 0;
 851     for (i = 0; i < BITS_TO_U64S(size); i++) {
 852         uint64_t w = qemu_get_be64(f);
 853         bmp[idx++] = w;
 854         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
 855             bmp[idx++] = w >> 32;
 856         }
 857     }
 858     return 0;
 859 }
 860
 861 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
 862 {
 863     unsigned long *bmp = pv;
 864     int i, idx = 0;
 865     for (i = 0; i < BITS_TO_U64S(size); i++) {
 866         uint64_t w = bmp[idx++];
 867         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
 868             w |= ((uint64_t)bmp[idx++]) << 32;
 869         }
 870         qemu_put_be64(f, w);
 871     }
 872 }
 873
 874 const VMStateInfo vmstate_info_bitmap = {
 875     .name = "bitmap",
 876     .get = get_bitmap,
 877     .put = put_bitmap,
 878 };