1 /* 2 * QEMU dump 3 * 4 * Copyright Fujitsu, Corp. 2011, 2012 5 * 6 * Authors: 7 * Wen Congyang <wency@cn.fujitsu.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/cutils.h" 16 #include "elf.h" 17 #include "exec/hwaddr.h" 18 #include "monitor/monitor.h" 19 #include "sysemu/kvm.h" 20 #include "sysemu/dump.h" 21 #include "sysemu/memory_mapping.h" 22 #include "sysemu/runstate.h" 23 #include "sysemu/cpus.h" 24 #include "qapi/error.h" 25 #include "qapi/qapi-commands-dump.h" 26 #include "qapi/qapi-events-dump.h" 27 #include "qapi/qmp/qerror.h" 28 #include "qemu/error-report.h" 29 #include "qemu/main-loop.h" 30 #include "hw/misc/vmcoreinfo.h" 31 #include "migration/blocker.h" 32 33 #ifdef TARGET_X86_64 34 #include "win_dump.h" 35 #endif 36 37 #include <zlib.h> 38 #ifdef CONFIG_LZO 39 #include <lzo/lzo1x.h> 40 #endif 41 #ifdef CONFIG_SNAPPY 42 #include <snappy-c.h> 43 #endif 44 #ifndef ELF_MACHINE_UNAME 45 #define ELF_MACHINE_UNAME "Unknown" 46 #endif 47 48 #define MAX_GUEST_NOTE_SIZE (1 << 20) /* 1MB should be enough */ 49 50 static Error *dump_migration_blocker; 51 52 #define ELF_NOTE_SIZE(hdr_size, name_size, desc_size) \ 53 ((DIV_ROUND_UP((hdr_size), 4) + \ 54 DIV_ROUND_UP((name_size), 4) + \ 55 DIV_ROUND_UP((desc_size), 4)) * 4) 56 57 static inline bool dump_is_64bit(DumpState *s) 58 { 59 return s->dump_info.d_class == ELFCLASS64; 60 } 61 62 uint16_t cpu_to_dump16(DumpState *s, uint16_t val) 63 { 64 if (s->dump_info.d_endian == ELFDATA2LSB) { 65 val = cpu_to_le16(val); 66 } else { 67 val = cpu_to_be16(val); 68 } 69 70 return val; 71 } 72 73 uint32_t cpu_to_dump32(DumpState *s, uint32_t val) 74 { 75 if (s->dump_info.d_endian == ELFDATA2LSB) { 76 val = cpu_to_le32(val); 77 } else { 78 val = cpu_to_be32(val); 79 } 80 81 return val; 82 } 83 84 uint64_t cpu_to_dump64(DumpState *s, uint64_t val) 85 { 86 if (s->dump_info.d_endian == ELFDATA2LSB) { 87 val = cpu_to_le64(val); 88 } else { 89 val = cpu_to_be64(val); 90 } 91 92 return val; 93 } 94 95 static int dump_cleanup(DumpState *s) 96 { 97 guest_phys_blocks_free(&s->guest_phys_blocks); 98 memory_mapping_list_free(&s->list); 99 close(s->fd); 100 g_free(s->guest_note); 101 s->guest_note = NULL; 102 if (s->resume) { 103 if (s->detached) { 104 qemu_mutex_lock_iothread(); 105 } 106 vm_start(); 107 if (s->detached) { 108 qemu_mutex_unlock_iothread(); 109 } 110 } 111 migrate_del_blocker(dump_migration_blocker); 112 113 return 0; 114 } 115 116 static int fd_write_vmcore(const void *buf, size_t size, void *opaque) 117 { 118 DumpState *s = opaque; 119 size_t written_size; 120 121 written_size = qemu_write_full(s->fd, buf, size); 122 if (written_size != size) { 123 return -errno; 124 } 125 126 return 0; 127 } 128 129 static void write_elf64_header(DumpState *s, Error **errp) 130 { 131 /* 132 * phnum in the elf header is 16 bit, if we have more segments we 133 * set phnum to PN_XNUM and write the real number of segments to a 134 * special section. 135 */ 136 uint16_t phnum = MIN(s->phdr_num, PN_XNUM); 137 Elf64_Ehdr elf_header; 138 int ret; 139 140 memset(&elf_header, 0, sizeof(Elf64_Ehdr)); 141 memcpy(&elf_header, ELFMAG, SELFMAG); 142 elf_header.e_ident[EI_CLASS] = ELFCLASS64; 143 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 144 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 145 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 146 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 147 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 148 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 149 elf_header.e_phoff = cpu_to_dump64(s, s->phdr_offset); 150 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); 151 elf_header.e_phnum = cpu_to_dump16(s, phnum); 152 if (s->shdr_num) { 153 elf_header.e_shoff = cpu_to_dump64(s, s->shdr_offset); 154 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); 155 elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num); 156 } 157 158 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 159 if (ret < 0) { 160 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 161 } 162 } 163 164 static void write_elf32_header(DumpState *s, Error **errp) 165 { 166 /* 167 * phnum in the elf header is 16 bit, if we have more segments we 168 * set phnum to PN_XNUM and write the real number of segments to a 169 * special section. 170 */ 171 uint16_t phnum = MIN(s->phdr_num, PN_XNUM); 172 Elf32_Ehdr elf_header; 173 int ret; 174 175 memset(&elf_header, 0, sizeof(Elf32_Ehdr)); 176 memcpy(&elf_header, ELFMAG, SELFMAG); 177 elf_header.e_ident[EI_CLASS] = ELFCLASS32; 178 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 179 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 180 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 181 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 182 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 183 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 184 elf_header.e_phoff = cpu_to_dump32(s, s->phdr_offset); 185 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); 186 elf_header.e_phnum = cpu_to_dump16(s, phnum); 187 if (s->shdr_num) { 188 elf_header.e_shoff = cpu_to_dump32(s, s->shdr_offset); 189 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); 190 elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num); 191 } 192 193 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 194 if (ret < 0) { 195 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 196 } 197 } 198 199 static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, 200 int phdr_index, hwaddr offset, 201 hwaddr filesz, Error **errp) 202 { 203 Elf64_Phdr phdr; 204 int ret; 205 206 memset(&phdr, 0, sizeof(Elf64_Phdr)); 207 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 208 phdr.p_offset = cpu_to_dump64(s, offset); 209 phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); 210 phdr.p_filesz = cpu_to_dump64(s, filesz); 211 phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); 212 phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 213 214 assert(memory_mapping->length >= filesz); 215 216 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 217 if (ret < 0) { 218 error_setg_errno(errp, -ret, 219 "dump: failed to write program header table"); 220 } 221 } 222 223 static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, 224 int phdr_index, hwaddr offset, 225 hwaddr filesz, Error **errp) 226 { 227 Elf32_Phdr phdr; 228 int ret; 229 230 memset(&phdr, 0, sizeof(Elf32_Phdr)); 231 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 232 phdr.p_offset = cpu_to_dump32(s, offset); 233 phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); 234 phdr.p_filesz = cpu_to_dump32(s, filesz); 235 phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); 236 phdr.p_vaddr = 237 cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 238 239 assert(memory_mapping->length >= filesz); 240 241 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 242 if (ret < 0) { 243 error_setg_errno(errp, -ret, 244 "dump: failed to write program header table"); 245 } 246 } 247 248 static void write_elf64_note(DumpState *s, Error **errp) 249 { 250 Elf64_Phdr phdr; 251 int ret; 252 253 memset(&phdr, 0, sizeof(Elf64_Phdr)); 254 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 255 phdr.p_offset = cpu_to_dump64(s, s->note_offset); 256 phdr.p_paddr = 0; 257 phdr.p_filesz = cpu_to_dump64(s, s->note_size); 258 phdr.p_memsz = cpu_to_dump64(s, s->note_size); 259 phdr.p_vaddr = 0; 260 261 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 262 if (ret < 0) { 263 error_setg_errno(errp, -ret, 264 "dump: failed to write program header table"); 265 } 266 } 267 268 static inline int cpu_index(CPUState *cpu) 269 { 270 return cpu->cpu_index + 1; 271 } 272 273 static void write_guest_note(WriteCoreDumpFunction f, DumpState *s, 274 Error **errp) 275 { 276 int ret; 277 278 if (s->guest_note) { 279 ret = f(s->guest_note, s->guest_note_size, s); 280 if (ret < 0) { 281 error_setg(errp, "dump: failed to write guest note"); 282 } 283 } 284 } 285 286 static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, 287 Error **errp) 288 { 289 CPUState *cpu; 290 int ret; 291 int id; 292 293 CPU_FOREACH(cpu) { 294 id = cpu_index(cpu); 295 ret = cpu_write_elf64_note(f, cpu, id, s); 296 if (ret < 0) { 297 error_setg(errp, "dump: failed to write elf notes"); 298 return; 299 } 300 } 301 302 CPU_FOREACH(cpu) { 303 ret = cpu_write_elf64_qemunote(f, cpu, s); 304 if (ret < 0) { 305 error_setg(errp, "dump: failed to write CPU status"); 306 return; 307 } 308 } 309 310 write_guest_note(f, s, errp); 311 } 312 313 static void write_elf32_note(DumpState *s, Error **errp) 314 { 315 Elf32_Phdr phdr; 316 int ret; 317 318 memset(&phdr, 0, sizeof(Elf32_Phdr)); 319 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 320 phdr.p_offset = cpu_to_dump32(s, s->note_offset); 321 phdr.p_paddr = 0; 322 phdr.p_filesz = cpu_to_dump32(s, s->note_size); 323 phdr.p_memsz = cpu_to_dump32(s, s->note_size); 324 phdr.p_vaddr = 0; 325 326 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 327 if (ret < 0) { 328 error_setg_errno(errp, -ret, 329 "dump: failed to write program header table"); 330 } 331 } 332 333 static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, 334 Error **errp) 335 { 336 CPUState *cpu; 337 int ret; 338 int id; 339 340 CPU_FOREACH(cpu) { 341 id = cpu_index(cpu); 342 ret = cpu_write_elf32_note(f, cpu, id, s); 343 if (ret < 0) { 344 error_setg(errp, "dump: failed to write elf notes"); 345 return; 346 } 347 } 348 349 CPU_FOREACH(cpu) { 350 ret = cpu_write_elf32_qemunote(f, cpu, s); 351 if (ret < 0) { 352 error_setg(errp, "dump: failed to write CPU status"); 353 return; 354 } 355 } 356 357 write_guest_note(f, s, errp); 358 } 359 360 static void write_elf_section(DumpState *s, int type, Error **errp) 361 { 362 Elf32_Shdr shdr32; 363 Elf64_Shdr shdr64; 364 int shdr_size; 365 void *shdr; 366 int ret; 367 368 if (type == 0) { 369 shdr_size = sizeof(Elf32_Shdr); 370 memset(&shdr32, 0, shdr_size); 371 shdr32.sh_info = cpu_to_dump32(s, s->phdr_num); 372 shdr = &shdr32; 373 } else { 374 shdr_size = sizeof(Elf64_Shdr); 375 memset(&shdr64, 0, shdr_size); 376 shdr64.sh_info = cpu_to_dump32(s, s->phdr_num); 377 shdr = &shdr64; 378 } 379 380 ret = fd_write_vmcore(shdr, shdr_size, s); 381 if (ret < 0) { 382 error_setg_errno(errp, -ret, 383 "dump: failed to write section header table"); 384 } 385 } 386 387 static void write_data(DumpState *s, void *buf, int length, Error **errp) 388 { 389 int ret; 390 391 ret = fd_write_vmcore(buf, length, s); 392 if (ret < 0) { 393 error_setg_errno(errp, -ret, "dump: failed to save memory"); 394 } else { 395 s->written_size += length; 396 } 397 } 398 399 /* write the memory to vmcore. 1 page per I/O. */ 400 static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, 401 int64_t size, Error **errp) 402 { 403 ERRP_GUARD(); 404 int64_t i; 405 406 for (i = 0; i < size / s->dump_info.page_size; i++) { 407 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 408 s->dump_info.page_size, errp); 409 if (*errp) { 410 return; 411 } 412 } 413 414 if ((size % s->dump_info.page_size) != 0) { 415 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 416 size % s->dump_info.page_size, errp); 417 if (*errp) { 418 return; 419 } 420 } 421 } 422 423 /* get the memory's offset and size in the vmcore */ 424 static void get_offset_range(hwaddr phys_addr, 425 ram_addr_t mapping_length, 426 DumpState *s, 427 hwaddr *p_offset, 428 hwaddr *p_filesz) 429 { 430 GuestPhysBlock *block; 431 hwaddr offset = s->memory_offset; 432 int64_t size_in_block, start; 433 434 /* When the memory is not stored into vmcore, offset will be -1 */ 435 *p_offset = -1; 436 *p_filesz = 0; 437 438 if (s->has_filter) { 439 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { 440 return; 441 } 442 } 443 444 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 445 if (s->has_filter) { 446 if (block->target_start >= s->begin + s->length || 447 block->target_end <= s->begin) { 448 /* This block is out of the range */ 449 continue; 450 } 451 452 if (s->begin <= block->target_start) { 453 start = block->target_start; 454 } else { 455 start = s->begin; 456 } 457 458 size_in_block = block->target_end - start; 459 if (s->begin + s->length < block->target_end) { 460 size_in_block -= block->target_end - (s->begin + s->length); 461 } 462 } else { 463 start = block->target_start; 464 size_in_block = block->target_end - block->target_start; 465 } 466 467 if (phys_addr >= start && phys_addr < start + size_in_block) { 468 *p_offset = phys_addr - start + offset; 469 470 /* The offset range mapped from the vmcore file must not spill over 471 * the GuestPhysBlock, clamp it. The rest of the mapping will be 472 * zero-filled in memory at load time; see 473 * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. 474 */ 475 *p_filesz = phys_addr + mapping_length <= start + size_in_block ? 476 mapping_length : 477 size_in_block - (phys_addr - start); 478 return; 479 } 480 481 offset += size_in_block; 482 } 483 } 484 485 static void write_elf_loads(DumpState *s, Error **errp) 486 { 487 ERRP_GUARD(); 488 hwaddr offset, filesz; 489 MemoryMapping *memory_mapping; 490 uint32_t phdr_index = 1; 491 492 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { 493 get_offset_range(memory_mapping->phys_addr, 494 memory_mapping->length, 495 s, &offset, &filesz); 496 if (dump_is_64bit(s)) { 497 write_elf64_load(s, memory_mapping, phdr_index++, offset, 498 filesz, errp); 499 } else { 500 write_elf32_load(s, memory_mapping, phdr_index++, offset, 501 filesz, errp); 502 } 503 504 if (*errp) { 505 return; 506 } 507 508 if (phdr_index >= s->phdr_num) { 509 break; 510 } 511 } 512 } 513 514 /* write elf header, PT_NOTE and elf note to vmcore. */ 515 static void dump_begin(DumpState *s, Error **errp) 516 { 517 ERRP_GUARD(); 518 519 /* 520 * the vmcore's format is: 521 * -------------- 522 * | elf header | 523 * -------------- 524 * | PT_NOTE | 525 * -------------- 526 * | PT_LOAD | 527 * -------------- 528 * | ...... | 529 * -------------- 530 * | PT_LOAD | 531 * -------------- 532 * | sec_hdr | 533 * -------------- 534 * | elf note | 535 * -------------- 536 * | memory | 537 * -------------- 538 * 539 * we only know where the memory is saved after we write elf note into 540 * vmcore. 541 */ 542 543 /* write elf header to vmcore */ 544 if (dump_is_64bit(s)) { 545 write_elf64_header(s, errp); 546 } else { 547 write_elf32_header(s, errp); 548 } 549 if (*errp) { 550 return; 551 } 552 553 if (dump_is_64bit(s)) { 554 /* write PT_NOTE to vmcore */ 555 write_elf64_note(s, errp); 556 if (*errp) { 557 return; 558 } 559 560 /* write all PT_LOAD to vmcore */ 561 write_elf_loads(s, errp); 562 if (*errp) { 563 return; 564 } 565 566 /* write section to vmcore */ 567 if (s->shdr_num) { 568 write_elf_section(s, 1, errp); 569 if (*errp) { 570 return; 571 } 572 } 573 574 /* write notes to vmcore */ 575 write_elf64_notes(fd_write_vmcore, s, errp); 576 if (*errp) { 577 return; 578 } 579 } else { 580 /* write PT_NOTE to vmcore */ 581 write_elf32_note(s, errp); 582 if (*errp) { 583 return; 584 } 585 586 /* write all PT_LOAD to vmcore */ 587 write_elf_loads(s, errp); 588 if (*errp) { 589 return; 590 } 591 592 /* write section to vmcore */ 593 if (s->shdr_num) { 594 write_elf_section(s, 0, errp); 595 if (*errp) { 596 return; 597 } 598 } 599 600 /* write notes to vmcore */ 601 write_elf32_notes(fd_write_vmcore, s, errp); 602 if (*errp) { 603 return; 604 } 605 } 606 } 607 608 static int get_next_block(DumpState *s, GuestPhysBlock *block) 609 { 610 while (1) { 611 block = QTAILQ_NEXT(block, next); 612 if (!block) { 613 /* no more block */ 614 return 1; 615 } 616 617 s->start = 0; 618 s->next_block = block; 619 if (s->has_filter) { 620 if (block->target_start >= s->begin + s->length || 621 block->target_end <= s->begin) { 622 /* This block is out of the range */ 623 continue; 624 } 625 626 if (s->begin > block->target_start) { 627 s->start = s->begin - block->target_start; 628 } 629 } 630 631 return 0; 632 } 633 } 634 635 /* write all memory to vmcore */ 636 static void dump_iterate(DumpState *s, Error **errp) 637 { 638 ERRP_GUARD(); 639 GuestPhysBlock *block; 640 int64_t size; 641 642 do { 643 block = s->next_block; 644 645 size = block->target_end - block->target_start; 646 if (s->has_filter) { 647 size -= s->start; 648 if (s->begin + s->length < block->target_end) { 649 size -= block->target_end - (s->begin + s->length); 650 } 651 } 652 write_memory(s, block, s->start, size, errp); 653 if (*errp) { 654 return; 655 } 656 657 } while (!get_next_block(s, block)); 658 } 659 660 static void create_vmcore(DumpState *s, Error **errp) 661 { 662 ERRP_GUARD(); 663 664 dump_begin(s, errp); 665 if (*errp) { 666 return; 667 } 668 669 dump_iterate(s, errp); 670 } 671 672 static int write_start_flat_header(int fd) 673 { 674 MakedumpfileHeader *mh; 675 int ret = 0; 676 677 QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); 678 mh = g_malloc0(MAX_SIZE_MDF_HEADER); 679 680 memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, 681 MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); 682 683 mh->type = cpu_to_be64(TYPE_FLAT_HEADER); 684 mh->version = cpu_to_be64(VERSION_FLAT_HEADER); 685 686 size_t written_size; 687 written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); 688 if (written_size != MAX_SIZE_MDF_HEADER) { 689 ret = -1; 690 } 691 692 g_free(mh); 693 return ret; 694 } 695 696 static int write_end_flat_header(int fd) 697 { 698 MakedumpfileDataHeader mdh; 699 700 mdh.offset = END_FLAG_FLAT_HEADER; 701 mdh.buf_size = END_FLAG_FLAT_HEADER; 702 703 size_t written_size; 704 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 705 if (written_size != sizeof(mdh)) { 706 return -1; 707 } 708 709 return 0; 710 } 711 712 static int write_buffer(int fd, off_t offset, const void *buf, size_t size) 713 { 714 size_t written_size; 715 MakedumpfileDataHeader mdh; 716 717 mdh.offset = cpu_to_be64(offset); 718 mdh.buf_size = cpu_to_be64(size); 719 720 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 721 if (written_size != sizeof(mdh)) { 722 return -1; 723 } 724 725 written_size = qemu_write_full(fd, buf, size); 726 if (written_size != size) { 727 return -1; 728 } 729 730 return 0; 731 } 732 733 static int buf_write_note(const void *buf, size_t size, void *opaque) 734 { 735 DumpState *s = opaque; 736 737 /* note_buf is not enough */ 738 if (s->note_buf_offset + size > s->note_size) { 739 return -1; 740 } 741 742 memcpy(s->note_buf + s->note_buf_offset, buf, size); 743 744 s->note_buf_offset += size; 745 746 return 0; 747 } 748 749 /* 750 * This function retrieves various sizes from an elf header. 751 * 752 * @note has to be a valid ELF note. The return sizes are unmodified 753 * (not padded or rounded up to be multiple of 4). 754 */ 755 static void get_note_sizes(DumpState *s, const void *note, 756 uint64_t *note_head_size, 757 uint64_t *name_size, 758 uint64_t *desc_size) 759 { 760 uint64_t note_head_sz; 761 uint64_t name_sz; 762 uint64_t desc_sz; 763 764 if (dump_is_64bit(s)) { 765 const Elf64_Nhdr *hdr = note; 766 note_head_sz = sizeof(Elf64_Nhdr); 767 name_sz = tswap64(hdr->n_namesz); 768 desc_sz = tswap64(hdr->n_descsz); 769 } else { 770 const Elf32_Nhdr *hdr = note; 771 note_head_sz = sizeof(Elf32_Nhdr); 772 name_sz = tswap32(hdr->n_namesz); 773 desc_sz = tswap32(hdr->n_descsz); 774 } 775 776 if (note_head_size) { 777 *note_head_size = note_head_sz; 778 } 779 if (name_size) { 780 *name_size = name_sz; 781 } 782 if (desc_size) { 783 *desc_size = desc_sz; 784 } 785 } 786 787 static bool note_name_equal(DumpState *s, 788 const uint8_t *note, const char *name) 789 { 790 int len = strlen(name) + 1; 791 uint64_t head_size, name_size; 792 793 get_note_sizes(s, note, &head_size, &name_size, NULL); 794 head_size = ROUND_UP(head_size, 4); 795 796 return name_size == len && memcmp(note + head_size, name, len) == 0; 797 } 798 799 /* write common header, sub header and elf note to vmcore */ 800 static void create_header32(DumpState *s, Error **errp) 801 { 802 ERRP_GUARD(); 803 DiskDumpHeader32 *dh = NULL; 804 KdumpSubHeader32 *kh = NULL; 805 size_t size; 806 uint32_t block_size; 807 uint32_t sub_hdr_size; 808 uint32_t bitmap_blocks; 809 uint32_t status = 0; 810 uint64_t offset_note; 811 812 /* write common header, the version of kdump-compressed format is 6th */ 813 size = sizeof(DiskDumpHeader32); 814 dh = g_malloc0(size); 815 816 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 817 dh->header_version = cpu_to_dump32(s, 6); 818 block_size = s->dump_info.page_size; 819 dh->block_size = cpu_to_dump32(s, block_size); 820 sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; 821 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 822 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 823 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 824 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 825 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 826 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 827 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 828 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 829 830 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 831 status |= DUMP_DH_COMPRESSED_ZLIB; 832 } 833 #ifdef CONFIG_LZO 834 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 835 status |= DUMP_DH_COMPRESSED_LZO; 836 } 837 #endif 838 #ifdef CONFIG_SNAPPY 839 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 840 status |= DUMP_DH_COMPRESSED_SNAPPY; 841 } 842 #endif 843 dh->status = cpu_to_dump32(s, status); 844 845 if (write_buffer(s->fd, 0, dh, size) < 0) { 846 error_setg(errp, "dump: failed to write disk dump header"); 847 goto out; 848 } 849 850 /* write sub header */ 851 size = sizeof(KdumpSubHeader32); 852 kh = g_malloc0(size); 853 854 /* 64bit max_mapnr_64 */ 855 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 856 kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); 857 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 858 859 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 860 if (s->guest_note && 861 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 862 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 863 864 get_note_sizes(s, s->guest_note, 865 &hsize, &name_size, &size_vmcoreinfo_desc); 866 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 867 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 868 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 869 kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); 870 } 871 872 kh->offset_note = cpu_to_dump64(s, offset_note); 873 kh->note_size = cpu_to_dump32(s, s->note_size); 874 875 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 876 block_size, kh, size) < 0) { 877 error_setg(errp, "dump: failed to write kdump sub header"); 878 goto out; 879 } 880 881 /* write note */ 882 s->note_buf = g_malloc0(s->note_size); 883 s->note_buf_offset = 0; 884 885 /* use s->note_buf to store notes temporarily */ 886 write_elf32_notes(buf_write_note, s, errp); 887 if (*errp) { 888 goto out; 889 } 890 if (write_buffer(s->fd, offset_note, s->note_buf, 891 s->note_size) < 0) { 892 error_setg(errp, "dump: failed to write notes"); 893 goto out; 894 } 895 896 /* get offset of dump_bitmap */ 897 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 898 block_size; 899 900 /* get offset of page */ 901 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 902 block_size; 903 904 out: 905 g_free(dh); 906 g_free(kh); 907 g_free(s->note_buf); 908 } 909 910 /* write common header, sub header and elf note to vmcore */ 911 static void create_header64(DumpState *s, Error **errp) 912 { 913 ERRP_GUARD(); 914 DiskDumpHeader64 *dh = NULL; 915 KdumpSubHeader64 *kh = NULL; 916 size_t size; 917 uint32_t block_size; 918 uint32_t sub_hdr_size; 919 uint32_t bitmap_blocks; 920 uint32_t status = 0; 921 uint64_t offset_note; 922 923 /* write common header, the version of kdump-compressed format is 6th */ 924 size = sizeof(DiskDumpHeader64); 925 dh = g_malloc0(size); 926 927 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 928 dh->header_version = cpu_to_dump32(s, 6); 929 block_size = s->dump_info.page_size; 930 dh->block_size = cpu_to_dump32(s, block_size); 931 sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; 932 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 933 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 934 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 935 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 936 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 937 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 938 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 939 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 940 941 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 942 status |= DUMP_DH_COMPRESSED_ZLIB; 943 } 944 #ifdef CONFIG_LZO 945 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 946 status |= DUMP_DH_COMPRESSED_LZO; 947 } 948 #endif 949 #ifdef CONFIG_SNAPPY 950 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 951 status |= DUMP_DH_COMPRESSED_SNAPPY; 952 } 953 #endif 954 dh->status = cpu_to_dump32(s, status); 955 956 if (write_buffer(s->fd, 0, dh, size) < 0) { 957 error_setg(errp, "dump: failed to write disk dump header"); 958 goto out; 959 } 960 961 /* write sub header */ 962 size = sizeof(KdumpSubHeader64); 963 kh = g_malloc0(size); 964 965 /* 64bit max_mapnr_64 */ 966 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 967 kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); 968 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 969 970 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 971 if (s->guest_note && 972 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 973 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 974 975 get_note_sizes(s, s->guest_note, 976 &hsize, &name_size, &size_vmcoreinfo_desc); 977 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 978 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 979 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 980 kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); 981 } 982 983 kh->offset_note = cpu_to_dump64(s, offset_note); 984 kh->note_size = cpu_to_dump64(s, s->note_size); 985 986 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 987 block_size, kh, size) < 0) { 988 error_setg(errp, "dump: failed to write kdump sub header"); 989 goto out; 990 } 991 992 /* write note */ 993 s->note_buf = g_malloc0(s->note_size); 994 s->note_buf_offset = 0; 995 996 /* use s->note_buf to store notes temporarily */ 997 write_elf64_notes(buf_write_note, s, errp); 998 if (*errp) { 999 goto out; 1000 } 1001 1002 if (write_buffer(s->fd, offset_note, s->note_buf, 1003 s->note_size) < 0) { 1004 error_setg(errp, "dump: failed to write notes"); 1005 goto out; 1006 } 1007 1008 /* get offset of dump_bitmap */ 1009 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 1010 block_size; 1011 1012 /* get offset of page */ 1013 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 1014 block_size; 1015 1016 out: 1017 g_free(dh); 1018 g_free(kh); 1019 g_free(s->note_buf); 1020 } 1021 1022 static void write_dump_header(DumpState *s, Error **errp) 1023 { 1024 if (dump_is_64bit(s)) { 1025 create_header64(s, errp); 1026 } else { 1027 create_header32(s, errp); 1028 } 1029 } 1030 1031 static size_t dump_bitmap_get_bufsize(DumpState *s) 1032 { 1033 return s->dump_info.page_size; 1034 } 1035 1036 /* 1037 * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be 1038 * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. 1039 * set_dump_bitmap will always leave the recently set bit un-sync. And setting 1040 * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into 1041 * vmcore, ie. synchronizing un-sync bit into vmcore. 1042 */ 1043 static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, 1044 uint8_t *buf, DumpState *s) 1045 { 1046 off_t old_offset, new_offset; 1047 off_t offset_bitmap1, offset_bitmap2; 1048 uint32_t byte, bit; 1049 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1050 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1051 1052 /* should not set the previous place */ 1053 assert(last_pfn <= pfn); 1054 1055 /* 1056 * if the bit needed to be set is not cached in buf, flush the data in buf 1057 * to vmcore firstly. 1058 * making new_offset be bigger than old_offset can also sync remained data 1059 * into vmcore. 1060 */ 1061 old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); 1062 new_offset = bitmap_bufsize * (pfn / bits_per_buf); 1063 1064 while (old_offset < new_offset) { 1065 /* calculate the offset and write dump_bitmap */ 1066 offset_bitmap1 = s->offset_dump_bitmap + old_offset; 1067 if (write_buffer(s->fd, offset_bitmap1, buf, 1068 bitmap_bufsize) < 0) { 1069 return -1; 1070 } 1071 1072 /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ 1073 offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + 1074 old_offset; 1075 if (write_buffer(s->fd, offset_bitmap2, buf, 1076 bitmap_bufsize) < 0) { 1077 return -1; 1078 } 1079 1080 memset(buf, 0, bitmap_bufsize); 1081 old_offset += bitmap_bufsize; 1082 } 1083 1084 /* get the exact place of the bit in the buf, and set it */ 1085 byte = (pfn % bits_per_buf) / CHAR_BIT; 1086 bit = (pfn % bits_per_buf) % CHAR_BIT; 1087 if (value) { 1088 buf[byte] |= 1u << bit; 1089 } else { 1090 buf[byte] &= ~(1u << bit); 1091 } 1092 1093 return 0; 1094 } 1095 1096 static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) 1097 { 1098 int target_page_shift = ctz32(s->dump_info.page_size); 1099 1100 return (addr >> target_page_shift) - ARCH_PFN_OFFSET; 1101 } 1102 1103 static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) 1104 { 1105 int target_page_shift = ctz32(s->dump_info.page_size); 1106 1107 return (pfn + ARCH_PFN_OFFSET) << target_page_shift; 1108 } 1109 1110 /* 1111 * exam every page and return the page frame number and the address of the page. 1112 * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys 1113 * blocks, so block->target_start and block->target_end should be interal 1114 * multiples of the target page size. 1115 */ 1116 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, 1117 uint8_t **bufptr, DumpState *s) 1118 { 1119 GuestPhysBlock *block = *blockptr; 1120 hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); 1121 uint8_t *buf; 1122 1123 /* block == NULL means the start of the iteration */ 1124 if (!block) { 1125 block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1126 *blockptr = block; 1127 assert((block->target_start & ~target_page_mask) == 0); 1128 assert((block->target_end & ~target_page_mask) == 0); 1129 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1130 if (bufptr) { 1131 *bufptr = block->host_addr; 1132 } 1133 return true; 1134 } 1135 1136 *pfnptr = *pfnptr + 1; 1137 addr = dump_pfn_to_paddr(s, *pfnptr); 1138 1139 if ((addr >= block->target_start) && 1140 (addr + s->dump_info.page_size <= block->target_end)) { 1141 buf = block->host_addr + (addr - block->target_start); 1142 } else { 1143 /* the next page is in the next block */ 1144 block = QTAILQ_NEXT(block, next); 1145 *blockptr = block; 1146 if (!block) { 1147 return false; 1148 } 1149 assert((block->target_start & ~target_page_mask) == 0); 1150 assert((block->target_end & ~target_page_mask) == 0); 1151 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1152 buf = block->host_addr; 1153 } 1154 1155 if (bufptr) { 1156 *bufptr = buf; 1157 } 1158 1159 return true; 1160 } 1161 1162 static void write_dump_bitmap(DumpState *s, Error **errp) 1163 { 1164 int ret = 0; 1165 uint64_t last_pfn, pfn; 1166 void *dump_bitmap_buf; 1167 size_t num_dumpable; 1168 GuestPhysBlock *block_iter = NULL; 1169 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1170 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1171 1172 /* dump_bitmap_buf is used to store dump_bitmap temporarily */ 1173 dump_bitmap_buf = g_malloc0(bitmap_bufsize); 1174 1175 num_dumpable = 0; 1176 last_pfn = 0; 1177 1178 /* 1179 * exam memory page by page, and set the bit in dump_bitmap corresponded 1180 * to the existing page. 1181 */ 1182 while (get_next_page(&block_iter, &pfn, NULL, s)) { 1183 ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); 1184 if (ret < 0) { 1185 error_setg(errp, "dump: failed to set dump_bitmap"); 1186 goto out; 1187 } 1188 1189 last_pfn = pfn; 1190 num_dumpable++; 1191 } 1192 1193 /* 1194 * set_dump_bitmap will always leave the recently set bit un-sync. Here we 1195 * set the remaining bits from last_pfn to the end of the bitmap buffer to 1196 * 0. With those set, the un-sync bit will be synchronized into the vmcore. 1197 */ 1198 if (num_dumpable > 0) { 1199 ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, 1200 dump_bitmap_buf, s); 1201 if (ret < 0) { 1202 error_setg(errp, "dump: failed to sync dump_bitmap"); 1203 goto out; 1204 } 1205 } 1206 1207 /* number of dumpable pages that will be dumped later */ 1208 s->num_dumpable = num_dumpable; 1209 1210 out: 1211 g_free(dump_bitmap_buf); 1212 } 1213 1214 static void prepare_data_cache(DataCache *data_cache, DumpState *s, 1215 off_t offset) 1216 { 1217 data_cache->fd = s->fd; 1218 data_cache->data_size = 0; 1219 data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); 1220 data_cache->buf = g_malloc0(data_cache->buf_size); 1221 data_cache->offset = offset; 1222 } 1223 1224 static int write_cache(DataCache *dc, const void *buf, size_t size, 1225 bool flag_sync) 1226 { 1227 /* 1228 * dc->buf_size should not be less than size, otherwise dc will never be 1229 * enough 1230 */ 1231 assert(size <= dc->buf_size); 1232 1233 /* 1234 * if flag_sync is set, synchronize data in dc->buf into vmcore. 1235 * otherwise check if the space is enough for caching data in buf, if not, 1236 * write the data in dc->buf to dc->fd and reset dc->buf 1237 */ 1238 if ((!flag_sync && dc->data_size + size > dc->buf_size) || 1239 (flag_sync && dc->data_size > 0)) { 1240 if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { 1241 return -1; 1242 } 1243 1244 dc->offset += dc->data_size; 1245 dc->data_size = 0; 1246 } 1247 1248 if (!flag_sync) { 1249 memcpy(dc->buf + dc->data_size, buf, size); 1250 dc->data_size += size; 1251 } 1252 1253 return 0; 1254 } 1255 1256 static void free_data_cache(DataCache *data_cache) 1257 { 1258 g_free(data_cache->buf); 1259 } 1260 1261 static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) 1262 { 1263 switch (flag_compress) { 1264 case DUMP_DH_COMPRESSED_ZLIB: 1265 return compressBound(page_size); 1266 1267 case DUMP_DH_COMPRESSED_LZO: 1268 /* 1269 * LZO will expand incompressible data by a little amount. Please check 1270 * the following URL to see the expansion calculation: 1271 * http://www.oberhumer.com/opensource/lzo/lzofaq.php 1272 */ 1273 return page_size + page_size / 16 + 64 + 3; 1274 1275 #ifdef CONFIG_SNAPPY 1276 case DUMP_DH_COMPRESSED_SNAPPY: 1277 return snappy_max_compressed_length(page_size); 1278 #endif 1279 } 1280 return 0; 1281 } 1282 1283 static void write_dump_pages(DumpState *s, Error **errp) 1284 { 1285 int ret = 0; 1286 DataCache page_desc, page_data; 1287 size_t len_buf_out, size_out; 1288 #ifdef CONFIG_LZO 1289 lzo_bytep wrkmem = NULL; 1290 #endif 1291 uint8_t *buf_out = NULL; 1292 off_t offset_desc, offset_data; 1293 PageDescriptor pd, pd_zero; 1294 uint8_t *buf; 1295 GuestPhysBlock *block_iter = NULL; 1296 uint64_t pfn_iter; 1297 1298 /* get offset of page_desc and page_data in dump file */ 1299 offset_desc = s->offset_page; 1300 offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; 1301 1302 prepare_data_cache(&page_desc, s, offset_desc); 1303 prepare_data_cache(&page_data, s, offset_data); 1304 1305 /* prepare buffer to store compressed data */ 1306 len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); 1307 assert(len_buf_out != 0); 1308 1309 #ifdef CONFIG_LZO 1310 wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); 1311 #endif 1312 1313 buf_out = g_malloc(len_buf_out); 1314 1315 /* 1316 * init zero page's page_desc and page_data, because every zero page 1317 * uses the same page_data 1318 */ 1319 pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); 1320 pd_zero.flags = cpu_to_dump32(s, 0); 1321 pd_zero.offset = cpu_to_dump64(s, offset_data); 1322 pd_zero.page_flags = cpu_to_dump64(s, 0); 1323 buf = g_malloc0(s->dump_info.page_size); 1324 ret = write_cache(&page_data, buf, s->dump_info.page_size, false); 1325 g_free(buf); 1326 if (ret < 0) { 1327 error_setg(errp, "dump: failed to write page data (zero page)"); 1328 goto out; 1329 } 1330 1331 offset_data += s->dump_info.page_size; 1332 1333 /* 1334 * dump memory to vmcore page by page. zero page will all be resided in the 1335 * first page of page section 1336 */ 1337 while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { 1338 /* check zero page */ 1339 if (buffer_is_zero(buf, s->dump_info.page_size)) { 1340 ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), 1341 false); 1342 if (ret < 0) { 1343 error_setg(errp, "dump: failed to write page desc"); 1344 goto out; 1345 } 1346 } else { 1347 /* 1348 * not zero page, then: 1349 * 1. compress the page 1350 * 2. write the compressed page into the cache of page_data 1351 * 3. get page desc of the compressed page and write it into the 1352 * cache of page_desc 1353 * 1354 * only one compression format will be used here, for 1355 * s->flag_compress is set. But when compression fails to work, 1356 * we fall back to save in plaintext. 1357 */ 1358 size_out = len_buf_out; 1359 if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && 1360 (compress2(buf_out, (uLongf *)&size_out, buf, 1361 s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && 1362 (size_out < s->dump_info.page_size)) { 1363 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); 1364 pd.size = cpu_to_dump32(s, size_out); 1365 1366 ret = write_cache(&page_data, buf_out, size_out, false); 1367 if (ret < 0) { 1368 error_setg(errp, "dump: failed to write page data"); 1369 goto out; 1370 } 1371 #ifdef CONFIG_LZO 1372 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && 1373 (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, 1374 (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && 1375 (size_out < s->dump_info.page_size)) { 1376 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); 1377 pd.size = cpu_to_dump32(s, size_out); 1378 1379 ret = write_cache(&page_data, buf_out, size_out, false); 1380 if (ret < 0) { 1381 error_setg(errp, "dump: failed to write page data"); 1382 goto out; 1383 } 1384 #endif 1385 #ifdef CONFIG_SNAPPY 1386 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && 1387 (snappy_compress((char *)buf, s->dump_info.page_size, 1388 (char *)buf_out, &size_out) == SNAPPY_OK) && 1389 (size_out < s->dump_info.page_size)) { 1390 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); 1391 pd.size = cpu_to_dump32(s, size_out); 1392 1393 ret = write_cache(&page_data, buf_out, size_out, false); 1394 if (ret < 0) { 1395 error_setg(errp, "dump: failed to write page data"); 1396 goto out; 1397 } 1398 #endif 1399 } else { 1400 /* 1401 * fall back to save in plaintext, size_out should be 1402 * assigned the target's page size 1403 */ 1404 pd.flags = cpu_to_dump32(s, 0); 1405 size_out = s->dump_info.page_size; 1406 pd.size = cpu_to_dump32(s, size_out); 1407 1408 ret = write_cache(&page_data, buf, 1409 s->dump_info.page_size, false); 1410 if (ret < 0) { 1411 error_setg(errp, "dump: failed to write page data"); 1412 goto out; 1413 } 1414 } 1415 1416 /* get and write page desc here */ 1417 pd.page_flags = cpu_to_dump64(s, 0); 1418 pd.offset = cpu_to_dump64(s, offset_data); 1419 offset_data += size_out; 1420 1421 ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); 1422 if (ret < 0) { 1423 error_setg(errp, "dump: failed to write page desc"); 1424 goto out; 1425 } 1426 } 1427 s->written_size += s->dump_info.page_size; 1428 } 1429 1430 ret = write_cache(&page_desc, NULL, 0, true); 1431 if (ret < 0) { 1432 error_setg(errp, "dump: failed to sync cache for page_desc"); 1433 goto out; 1434 } 1435 ret = write_cache(&page_data, NULL, 0, true); 1436 if (ret < 0) { 1437 error_setg(errp, "dump: failed to sync cache for page_data"); 1438 goto out; 1439 } 1440 1441 out: 1442 free_data_cache(&page_desc); 1443 free_data_cache(&page_data); 1444 1445 #ifdef CONFIG_LZO 1446 g_free(wrkmem); 1447 #endif 1448 1449 g_free(buf_out); 1450 } 1451 1452 static void create_kdump_vmcore(DumpState *s, Error **errp) 1453 { 1454 ERRP_GUARD(); 1455 int ret; 1456 1457 /* 1458 * the kdump-compressed format is: 1459 * File offset 1460 * +------------------------------------------+ 0x0 1461 * | main header (struct disk_dump_header) | 1462 * |------------------------------------------+ block 1 1463 * | sub header (struct kdump_sub_header) | 1464 * |------------------------------------------+ block 2 1465 * | 1st-dump_bitmap | 1466 * |------------------------------------------+ block 2 + X blocks 1467 * | 2nd-dump_bitmap | (aligned by block) 1468 * |------------------------------------------+ block 2 + 2 * X blocks 1469 * | page desc for pfn 0 (struct page_desc) | (aligned by block) 1470 * | page desc for pfn 1 (struct page_desc) | 1471 * | : | 1472 * |------------------------------------------| (not aligned by block) 1473 * | page data (pfn 0) | 1474 * | page data (pfn 1) | 1475 * | : | 1476 * +------------------------------------------+ 1477 */ 1478 1479 ret = write_start_flat_header(s->fd); 1480 if (ret < 0) { 1481 error_setg(errp, "dump: failed to write start flat header"); 1482 return; 1483 } 1484 1485 write_dump_header(s, errp); 1486 if (*errp) { 1487 return; 1488 } 1489 1490 write_dump_bitmap(s, errp); 1491 if (*errp) { 1492 return; 1493 } 1494 1495 write_dump_pages(s, errp); 1496 if (*errp) { 1497 return; 1498 } 1499 1500 ret = write_end_flat_header(s->fd); 1501 if (ret < 0) { 1502 error_setg(errp, "dump: failed to write end flat header"); 1503 return; 1504 } 1505 } 1506 1507 static ram_addr_t get_start_block(DumpState *s) 1508 { 1509 GuestPhysBlock *block; 1510 1511 if (!s->has_filter) { 1512 s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1513 return 0; 1514 } 1515 1516 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1517 if (block->target_start >= s->begin + s->length || 1518 block->target_end <= s->begin) { 1519 /* This block is out of the range */ 1520 continue; 1521 } 1522 1523 s->next_block = block; 1524 if (s->begin > block->target_start) { 1525 s->start = s->begin - block->target_start; 1526 } else { 1527 s->start = 0; 1528 } 1529 return s->start; 1530 } 1531 1532 return -1; 1533 } 1534 1535 static void get_max_mapnr(DumpState *s) 1536 { 1537 GuestPhysBlock *last_block; 1538 1539 last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); 1540 s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); 1541 } 1542 1543 static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; 1544 1545 static void dump_state_prepare(DumpState *s) 1546 { 1547 /* zero the struct, setting status to active */ 1548 *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; 1549 } 1550 1551 bool qemu_system_dump_in_progress(void) 1552 { 1553 DumpState *state = &dump_state_global; 1554 return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE); 1555 } 1556 1557 /* calculate total size of memory to be dumped (taking filter into 1558 * acoount.) */ 1559 static int64_t dump_calculate_size(DumpState *s) 1560 { 1561 GuestPhysBlock *block; 1562 int64_t size = 0, total = 0, left = 0, right = 0; 1563 1564 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1565 if (s->has_filter) { 1566 /* calculate the overlapped region. */ 1567 left = MAX(s->begin, block->target_start); 1568 right = MIN(s->begin + s->length, block->target_end); 1569 size = right - left; 1570 size = size > 0 ? size : 0; 1571 } else { 1572 /* count the whole region in */ 1573 size = (block->target_end - block->target_start); 1574 } 1575 total += size; 1576 } 1577 1578 return total; 1579 } 1580 1581 static void vmcoreinfo_update_phys_base(DumpState *s) 1582 { 1583 uint64_t size, note_head_size, name_size, phys_base; 1584 char **lines; 1585 uint8_t *vmci; 1586 size_t i; 1587 1588 if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { 1589 return; 1590 } 1591 1592 get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); 1593 note_head_size = ROUND_UP(note_head_size, 4); 1594 1595 vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); 1596 *(vmci + size) = '\0'; 1597 1598 lines = g_strsplit((char *)vmci, "\n", -1); 1599 for (i = 0; lines[i]; i++) { 1600 const char *prefix = NULL; 1601 1602 if (s->dump_info.d_machine == EM_X86_64) { 1603 prefix = "NUMBER(phys_base)="; 1604 } else if (s->dump_info.d_machine == EM_AARCH64) { 1605 prefix = "NUMBER(PHYS_OFFSET)="; 1606 } 1607 1608 if (prefix && g_str_has_prefix(lines[i], prefix)) { 1609 if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, 1610 &phys_base) < 0) { 1611 warn_report("Failed to read %s", prefix); 1612 } else { 1613 s->dump_info.phys_base = phys_base; 1614 } 1615 break; 1616 } 1617 } 1618 1619 g_strfreev(lines); 1620 } 1621 1622 static void dump_init(DumpState *s, int fd, bool has_format, 1623 DumpGuestMemoryFormat format, bool paging, bool has_filter, 1624 int64_t begin, int64_t length, Error **errp) 1625 { 1626 ERRP_GUARD(); 1627 VMCoreInfoState *vmci = vmcoreinfo_find(); 1628 CPUState *cpu; 1629 int nr_cpus; 1630 int ret; 1631 1632 s->has_format = has_format; 1633 s->format = format; 1634 s->written_size = 0; 1635 1636 /* kdump-compressed is conflict with paging and filter */ 1637 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1638 assert(!paging && !has_filter); 1639 } 1640 1641 if (runstate_is_running()) { 1642 vm_stop(RUN_STATE_SAVE_VM); 1643 s->resume = true; 1644 } else { 1645 s->resume = false; 1646 } 1647 1648 /* If we use KVM, we should synchronize the registers before we get dump 1649 * info or physmap info. 1650 */ 1651 cpu_synchronize_all_states(); 1652 nr_cpus = 0; 1653 CPU_FOREACH(cpu) { 1654 nr_cpus++; 1655 } 1656 1657 s->fd = fd; 1658 s->has_filter = has_filter; 1659 s->begin = begin; 1660 s->length = length; 1661 1662 memory_mapping_list_init(&s->list); 1663 1664 guest_phys_blocks_init(&s->guest_phys_blocks); 1665 guest_phys_blocks_append(&s->guest_phys_blocks); 1666 s->total_size = dump_calculate_size(s); 1667 #ifdef DEBUG_DUMP_GUEST_MEMORY 1668 fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); 1669 #endif 1670 1671 /* it does not make sense to dump non-existent memory */ 1672 if (!s->total_size) { 1673 error_setg(errp, "dump: no guest memory to dump"); 1674 goto cleanup; 1675 } 1676 1677 s->start = get_start_block(s); 1678 if (s->start == -1) { 1679 error_setg(errp, QERR_INVALID_PARAMETER, "begin"); 1680 goto cleanup; 1681 } 1682 1683 /* get dump info: endian, class and architecture. 1684 * If the target architecture is not supported, cpu_get_dump_info() will 1685 * return -1. 1686 */ 1687 ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); 1688 if (ret < 0) { 1689 error_setg(errp, QERR_UNSUPPORTED); 1690 goto cleanup; 1691 } 1692 1693 if (!s->dump_info.page_size) { 1694 s->dump_info.page_size = TARGET_PAGE_SIZE; 1695 } 1696 1697 s->note_size = cpu_get_note_size(s->dump_info.d_class, 1698 s->dump_info.d_machine, nr_cpus); 1699 if (s->note_size < 0) { 1700 error_setg(errp, QERR_UNSUPPORTED); 1701 goto cleanup; 1702 } 1703 1704 /* 1705 * The goal of this block is to (a) update the previously guessed 1706 * phys_base, (b) copy the guest note out of the guest. 1707 * Failure to do so is not fatal for dumping. 1708 */ 1709 if (vmci) { 1710 uint64_t addr, note_head_size, name_size, desc_size; 1711 uint32_t size; 1712 uint16_t format; 1713 1714 note_head_size = dump_is_64bit(s) ? 1715 sizeof(Elf64_Nhdr) : sizeof(Elf32_Nhdr); 1716 1717 format = le16_to_cpu(vmci->vmcoreinfo.guest_format); 1718 size = le32_to_cpu(vmci->vmcoreinfo.size); 1719 addr = le64_to_cpu(vmci->vmcoreinfo.paddr); 1720 if (!vmci->has_vmcoreinfo) { 1721 warn_report("guest note is not present"); 1722 } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { 1723 warn_report("guest note size is invalid: %" PRIu32, size); 1724 } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { 1725 warn_report("guest note format is unsupported: %" PRIu16, format); 1726 } else { 1727 s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ 1728 cpu_physical_memory_read(addr, s->guest_note, size); 1729 1730 get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); 1731 s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, 1732 desc_size); 1733 if (name_size > MAX_GUEST_NOTE_SIZE || 1734 desc_size > MAX_GUEST_NOTE_SIZE || 1735 s->guest_note_size > size) { 1736 warn_report("Invalid guest note header"); 1737 g_free(s->guest_note); 1738 s->guest_note = NULL; 1739 } else { 1740 vmcoreinfo_update_phys_base(s); 1741 s->note_size += s->guest_note_size; 1742 } 1743 } 1744 } 1745 1746 /* get memory mapping */ 1747 if (paging) { 1748 qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, errp); 1749 if (*errp) { 1750 goto cleanup; 1751 } 1752 } else { 1753 qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); 1754 } 1755 1756 s->nr_cpus = nr_cpus; 1757 1758 get_max_mapnr(s); 1759 1760 uint64_t tmp; 1761 tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), 1762 s->dump_info.page_size); 1763 s->len_dump_bitmap = tmp * s->dump_info.page_size; 1764 1765 /* init for kdump-compressed format */ 1766 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1767 switch (format) { 1768 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: 1769 s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; 1770 break; 1771 1772 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: 1773 #ifdef CONFIG_LZO 1774 if (lzo_init() != LZO_E_OK) { 1775 error_setg(errp, "failed to initialize the LZO library"); 1776 goto cleanup; 1777 } 1778 #endif 1779 s->flag_compress = DUMP_DH_COMPRESSED_LZO; 1780 break; 1781 1782 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: 1783 s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; 1784 break; 1785 1786 default: 1787 s->flag_compress = 0; 1788 } 1789 1790 return; 1791 } 1792 1793 if (s->has_filter) { 1794 memory_mapping_filter(&s->list, s->begin, s->length); 1795 } 1796 1797 /* 1798 * calculate phdr_num 1799 * 1800 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow 1801 */ 1802 s->phdr_num = 1; /* PT_NOTE */ 1803 if (s->list.num < UINT16_MAX - 2) { 1804 s->shdr_num = 0; 1805 s->phdr_num += s->list.num; 1806 } else { 1807 /* sh_info of section 0 holds the real number of phdrs */ 1808 s->shdr_num = 1; 1809 1810 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ 1811 if (s->list.num <= UINT32_MAX - 1) { 1812 s->phdr_num += s->list.num; 1813 } else { 1814 s->phdr_num = UINT32_MAX; 1815 } 1816 } 1817 1818 if (dump_is_64bit(s)) { 1819 s->phdr_offset = sizeof(Elf64_Ehdr); 1820 s->shdr_offset = s->phdr_offset + sizeof(Elf64_Phdr) * s->phdr_num; 1821 s->note_offset = s->shdr_offset + sizeof(Elf64_Shdr) * s->shdr_num; 1822 s->memory_offset = s->note_offset + s->note_size; 1823 } else { 1824 1825 s->phdr_offset = sizeof(Elf32_Ehdr); 1826 s->shdr_offset = s->phdr_offset + sizeof(Elf32_Phdr) * s->phdr_num; 1827 s->note_offset = s->shdr_offset + sizeof(Elf32_Shdr) * s->shdr_num; 1828 s->memory_offset = s->note_offset + s->note_size; 1829 } 1830 1831 return; 1832 1833 cleanup: 1834 dump_cleanup(s); 1835 } 1836 1837 /* this operation might be time consuming. */ 1838 static void dump_process(DumpState *s, Error **errp) 1839 { 1840 ERRP_GUARD(); 1841 DumpQueryResult *result = NULL; 1842 1843 if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1844 #ifdef TARGET_X86_64 1845 create_win_dump(s, errp); 1846 #endif 1847 } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1848 create_kdump_vmcore(s, errp); 1849 } else { 1850 create_vmcore(s, errp); 1851 } 1852 1853 /* make sure status is written after written_size updates */ 1854 smp_wmb(); 1855 qatomic_set(&s->status, 1856 (*errp ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); 1857 1858 /* send DUMP_COMPLETED message (unconditionally) */ 1859 result = qmp_query_dump(NULL); 1860 /* should never fail */ 1861 assert(result); 1862 qapi_event_send_dump_completed(result, !!*errp, (*errp ? 1863 error_get_pretty(*errp) : NULL)); 1864 qapi_free_DumpQueryResult(result); 1865 1866 dump_cleanup(s); 1867 } 1868 1869 static void *dump_thread(void *data) 1870 { 1871 DumpState *s = (DumpState *)data; 1872 dump_process(s, NULL); 1873 return NULL; 1874 } 1875 1876 DumpQueryResult *qmp_query_dump(Error **errp) 1877 { 1878 DumpQueryResult *result = g_new(DumpQueryResult, 1); 1879 DumpState *state = &dump_state_global; 1880 result->status = qatomic_read(&state->status); 1881 /* make sure we are reading status and written_size in order */ 1882 smp_rmb(); 1883 result->completed = state->written_size; 1884 result->total = state->total_size; 1885 return result; 1886 } 1887 1888 void qmp_dump_guest_memory(bool paging, const char *file, 1889 bool has_detach, bool detach, 1890 bool has_begin, int64_t begin, bool has_length, 1891 int64_t length, bool has_format, 1892 DumpGuestMemoryFormat format, Error **errp) 1893 { 1894 ERRP_GUARD(); 1895 const char *p; 1896 int fd = -1; 1897 DumpState *s; 1898 bool detach_p = false; 1899 1900 if (runstate_check(RUN_STATE_INMIGRATE)) { 1901 error_setg(errp, "Dump not allowed during incoming migration."); 1902 return; 1903 } 1904 1905 /* if there is a dump in background, we should wait until the dump 1906 * finished */ 1907 if (qemu_system_dump_in_progress()) { 1908 error_setg(errp, "There is a dump in process, please wait."); 1909 return; 1910 } 1911 1912 /* 1913 * kdump-compressed format need the whole memory dumped, so paging or 1914 * filter is not supported here. 1915 */ 1916 if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && 1917 (paging || has_begin || has_length)) { 1918 error_setg(errp, "kdump-compressed format doesn't support paging or " 1919 "filter"); 1920 return; 1921 } 1922 if (has_begin && !has_length) { 1923 error_setg(errp, QERR_MISSING_PARAMETER, "length"); 1924 return; 1925 } 1926 if (!has_begin && has_length) { 1927 error_setg(errp, QERR_MISSING_PARAMETER, "begin"); 1928 return; 1929 } 1930 if (has_detach) { 1931 detach_p = detach; 1932 } 1933 1934 /* check whether lzo/snappy is supported */ 1935 #ifndef CONFIG_LZO 1936 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { 1937 error_setg(errp, "kdump-lzo is not available now"); 1938 return; 1939 } 1940 #endif 1941 1942 #ifndef CONFIG_SNAPPY 1943 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { 1944 error_setg(errp, "kdump-snappy is not available now"); 1945 return; 1946 } 1947 #endif 1948 1949 #ifndef TARGET_X86_64 1950 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1951 error_setg(errp, "Windows dump is only available for x86-64"); 1952 return; 1953 } 1954 #endif 1955 1956 #if !defined(WIN32) 1957 if (strstart(file, "fd:", &p)) { 1958 fd = monitor_get_fd(monitor_cur(), p, errp); 1959 if (fd == -1) { 1960 return; 1961 } 1962 } 1963 #endif 1964 1965 if (strstart(file, "file:", &p)) { 1966 fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); 1967 if (fd < 0) { 1968 error_setg_file_open(errp, errno, p); 1969 return; 1970 } 1971 } 1972 1973 if (fd == -1) { 1974 error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); 1975 return; 1976 } 1977 1978 if (!dump_migration_blocker) { 1979 error_setg(&dump_migration_blocker, 1980 "Live migration disabled: dump-guest-memory in progress"); 1981 } 1982 1983 /* 1984 * Allows even for -only-migratable, but forbid migration during the 1985 * process of dump guest memory. 1986 */ 1987 if (migrate_add_blocker_internal(dump_migration_blocker, errp)) { 1988 /* Remember to release the fd before passing it over to dump state */ 1989 close(fd); 1990 return; 1991 } 1992 1993 s = &dump_state_global; 1994 dump_state_prepare(s); 1995 1996 dump_init(s, fd, has_format, format, paging, has_begin, 1997 begin, length, errp); 1998 if (*errp) { 1999 qatomic_set(&s->status, DUMP_STATUS_FAILED); 2000 return; 2001 } 2002 2003 if (detach_p) { 2004 /* detached dump */ 2005 s->detached = true; 2006 qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, 2007 s, QEMU_THREAD_DETACHED); 2008 } else { 2009 /* sync dump */ 2010 dump_process(s, errp); 2011 } 2012 } 2013 2014 DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) 2015 { 2016 DumpGuestMemoryCapability *cap = 2017 g_new0(DumpGuestMemoryCapability, 1); 2018 DumpGuestMemoryFormatList **tail = &cap->formats; 2019 2020 /* elf is always available */ 2021 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_ELF); 2022 2023 /* kdump-zlib is always available */ 2024 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB); 2025 2026 /* add new item if kdump-lzo is available */ 2027 #ifdef CONFIG_LZO 2028 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO); 2029 #endif 2030 2031 /* add new item if kdump-snappy is available */ 2032 #ifdef CONFIG_SNAPPY 2033 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY); 2034 #endif 2035 2036 /* Windows dump is available only if target is x86_64 */ 2037 #ifdef TARGET_X86_64 2038 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_WIN_DMP); 2039 #endif 2040 2041 return cap; 2042 } 2043