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 uint16_t cpu_to_dump16(DumpState *s, uint16_t val) 58 { 59 if (s->dump_info.d_endian == ELFDATA2LSB) { 60 val = cpu_to_le16(val); 61 } else { 62 val = cpu_to_be16(val); 63 } 64 65 return val; 66 } 67 68 uint32_t cpu_to_dump32(DumpState *s, uint32_t val) 69 { 70 if (s->dump_info.d_endian == ELFDATA2LSB) { 71 val = cpu_to_le32(val); 72 } else { 73 val = cpu_to_be32(val); 74 } 75 76 return val; 77 } 78 79 uint64_t cpu_to_dump64(DumpState *s, uint64_t val) 80 { 81 if (s->dump_info.d_endian == ELFDATA2LSB) { 82 val = cpu_to_le64(val); 83 } else { 84 val = cpu_to_be64(val); 85 } 86 87 return val; 88 } 89 90 static int dump_cleanup(DumpState *s) 91 { 92 guest_phys_blocks_free(&s->guest_phys_blocks); 93 memory_mapping_list_free(&s->list); 94 close(s->fd); 95 g_free(s->guest_note); 96 s->guest_note = NULL; 97 if (s->resume) { 98 if (s->detached) { 99 qemu_mutex_lock_iothread(); 100 } 101 vm_start(); 102 if (s->detached) { 103 qemu_mutex_unlock_iothread(); 104 } 105 } 106 migrate_del_blocker(dump_migration_blocker); 107 108 return 0; 109 } 110 111 static int fd_write_vmcore(const void *buf, size_t size, void *opaque) 112 { 113 DumpState *s = opaque; 114 size_t written_size; 115 116 written_size = qemu_write_full(s->fd, buf, size); 117 if (written_size != size) { 118 return -errno; 119 } 120 121 return 0; 122 } 123 124 static void write_elf64_header(DumpState *s, Error **errp) 125 { 126 /* 127 * phnum in the elf header is 16 bit, if we have more segments we 128 * set phnum to PN_XNUM and write the real number of segments to a 129 * special section. 130 */ 131 uint16_t phnum = MIN(s->phdr_num, PN_XNUM); 132 Elf64_Ehdr elf_header; 133 int ret; 134 135 memset(&elf_header, 0, sizeof(Elf64_Ehdr)); 136 memcpy(&elf_header, ELFMAG, SELFMAG); 137 elf_header.e_ident[EI_CLASS] = ELFCLASS64; 138 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 139 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 140 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 141 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 142 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 143 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 144 elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); 145 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); 146 elf_header.e_phnum = cpu_to_dump16(s, phnum); 147 if (s->have_section) { 148 uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->phdr_num; 149 150 elf_header.e_shoff = cpu_to_dump64(s, shoff); 151 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); 152 elf_header.e_shnum = cpu_to_dump16(s, 1); 153 } 154 155 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 156 if (ret < 0) { 157 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 158 } 159 } 160 161 static void write_elf32_header(DumpState *s, Error **errp) 162 { 163 /* 164 * phnum in the elf header is 16 bit, if we have more segments we 165 * set phnum to PN_XNUM and write the real number of segments to a 166 * special section. 167 */ 168 uint16_t phnum = MIN(s->phdr_num, PN_XNUM); 169 Elf32_Ehdr elf_header; 170 int ret; 171 172 memset(&elf_header, 0, sizeof(Elf32_Ehdr)); 173 memcpy(&elf_header, ELFMAG, SELFMAG); 174 elf_header.e_ident[EI_CLASS] = ELFCLASS32; 175 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 176 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 177 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 178 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 179 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 180 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 181 elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); 182 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); 183 elf_header.e_phnum = cpu_to_dump16(s, phnum); 184 if (s->have_section) { 185 uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->phdr_num; 186 187 elf_header.e_shoff = cpu_to_dump32(s, shoff); 188 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); 189 elf_header.e_shnum = cpu_to_dump16(s, 1); 190 } 191 192 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 193 if (ret < 0) { 194 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 195 } 196 } 197 198 static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, 199 int phdr_index, hwaddr offset, 200 hwaddr filesz, Error **errp) 201 { 202 Elf64_Phdr phdr; 203 int ret; 204 205 memset(&phdr, 0, sizeof(Elf64_Phdr)); 206 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 207 phdr.p_offset = cpu_to_dump64(s, offset); 208 phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); 209 phdr.p_filesz = cpu_to_dump64(s, filesz); 210 phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); 211 phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 212 213 assert(memory_mapping->length >= filesz); 214 215 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 216 if (ret < 0) { 217 error_setg_errno(errp, -ret, 218 "dump: failed to write program header table"); 219 } 220 } 221 222 static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, 223 int phdr_index, hwaddr offset, 224 hwaddr filesz, Error **errp) 225 { 226 Elf32_Phdr phdr; 227 int ret; 228 229 memset(&phdr, 0, sizeof(Elf32_Phdr)); 230 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 231 phdr.p_offset = cpu_to_dump32(s, offset); 232 phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); 233 phdr.p_filesz = cpu_to_dump32(s, filesz); 234 phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); 235 phdr.p_vaddr = 236 cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 237 238 assert(memory_mapping->length >= filesz); 239 240 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 241 if (ret < 0) { 242 error_setg_errno(errp, -ret, 243 "dump: failed to write program header table"); 244 } 245 } 246 247 static void write_elf64_note(DumpState *s, Error **errp) 248 { 249 Elf64_Phdr phdr; 250 hwaddr begin = s->memory_offset - s->note_size; 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, begin); 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 hwaddr begin = s->memory_offset - s->note_size; 316 Elf32_Phdr phdr; 317 int ret; 318 319 memset(&phdr, 0, sizeof(Elf32_Phdr)); 320 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 321 phdr.p_offset = cpu_to_dump32(s, begin); 322 phdr.p_paddr = 0; 323 phdr.p_filesz = cpu_to_dump32(s, s->note_size); 324 phdr.p_memsz = cpu_to_dump32(s, s->note_size); 325 phdr.p_vaddr = 0; 326 327 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 328 if (ret < 0) { 329 error_setg_errno(errp, -ret, 330 "dump: failed to write program header table"); 331 } 332 } 333 334 static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, 335 Error **errp) 336 { 337 CPUState *cpu; 338 int ret; 339 int id; 340 341 CPU_FOREACH(cpu) { 342 id = cpu_index(cpu); 343 ret = cpu_write_elf32_note(f, cpu, id, s); 344 if (ret < 0) { 345 error_setg(errp, "dump: failed to write elf notes"); 346 return; 347 } 348 } 349 350 CPU_FOREACH(cpu) { 351 ret = cpu_write_elf32_qemunote(f, cpu, s); 352 if (ret < 0) { 353 error_setg(errp, "dump: failed to write CPU status"); 354 return; 355 } 356 } 357 358 write_guest_note(f, s, errp); 359 } 360 361 static void write_elf_section(DumpState *s, int type, Error **errp) 362 { 363 Elf32_Shdr shdr32; 364 Elf64_Shdr shdr64; 365 int shdr_size; 366 void *shdr; 367 int ret; 368 369 if (type == 0) { 370 shdr_size = sizeof(Elf32_Shdr); 371 memset(&shdr32, 0, shdr_size); 372 shdr32.sh_info = cpu_to_dump32(s, s->phdr_num); 373 shdr = &shdr32; 374 } else { 375 shdr_size = sizeof(Elf64_Shdr); 376 memset(&shdr64, 0, shdr_size); 377 shdr64.sh_info = cpu_to_dump32(s, s->phdr_num); 378 shdr = &shdr64; 379 } 380 381 ret = fd_write_vmcore(shdr, shdr_size, s); 382 if (ret < 0) { 383 error_setg_errno(errp, -ret, 384 "dump: failed to write section header table"); 385 } 386 } 387 388 static void write_data(DumpState *s, void *buf, int length, Error **errp) 389 { 390 int ret; 391 392 ret = fd_write_vmcore(buf, length, s); 393 if (ret < 0) { 394 error_setg_errno(errp, -ret, "dump: failed to save memory"); 395 } else { 396 s->written_size += length; 397 } 398 } 399 400 /* write the memory to vmcore. 1 page per I/O. */ 401 static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, 402 int64_t size, Error **errp) 403 { 404 ERRP_GUARD(); 405 int64_t i; 406 407 for (i = 0; i < size / s->dump_info.page_size; i++) { 408 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 409 s->dump_info.page_size, errp); 410 if (*errp) { 411 return; 412 } 413 } 414 415 if ((size % s->dump_info.page_size) != 0) { 416 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 417 size % s->dump_info.page_size, errp); 418 if (*errp) { 419 return; 420 } 421 } 422 } 423 424 /* get the memory's offset and size in the vmcore */ 425 static void get_offset_range(hwaddr phys_addr, 426 ram_addr_t mapping_length, 427 DumpState *s, 428 hwaddr *p_offset, 429 hwaddr *p_filesz) 430 { 431 GuestPhysBlock *block; 432 hwaddr offset = s->memory_offset; 433 int64_t size_in_block, start; 434 435 /* When the memory is not stored into vmcore, offset will be -1 */ 436 *p_offset = -1; 437 *p_filesz = 0; 438 439 if (s->has_filter) { 440 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { 441 return; 442 } 443 } 444 445 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 446 if (s->has_filter) { 447 if (block->target_start >= s->begin + s->length || 448 block->target_end <= s->begin) { 449 /* This block is out of the range */ 450 continue; 451 } 452 453 if (s->begin <= block->target_start) { 454 start = block->target_start; 455 } else { 456 start = s->begin; 457 } 458 459 size_in_block = block->target_end - start; 460 if (s->begin + s->length < block->target_end) { 461 size_in_block -= block->target_end - (s->begin + s->length); 462 } 463 } else { 464 start = block->target_start; 465 size_in_block = block->target_end - block->target_start; 466 } 467 468 if (phys_addr >= start && phys_addr < start + size_in_block) { 469 *p_offset = phys_addr - start + offset; 470 471 /* The offset range mapped from the vmcore file must not spill over 472 * the GuestPhysBlock, clamp it. The rest of the mapping will be 473 * zero-filled in memory at load time; see 474 * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. 475 */ 476 *p_filesz = phys_addr + mapping_length <= start + size_in_block ? 477 mapping_length : 478 size_in_block - (phys_addr - start); 479 return; 480 } 481 482 offset += size_in_block; 483 } 484 } 485 486 static void write_elf_loads(DumpState *s, Error **errp) 487 { 488 ERRP_GUARD(); 489 hwaddr offset, filesz; 490 MemoryMapping *memory_mapping; 491 uint32_t phdr_index = 1; 492 493 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { 494 get_offset_range(memory_mapping->phys_addr, 495 memory_mapping->length, 496 s, &offset, &filesz); 497 if (s->dump_info.d_class == ELFCLASS64) { 498 write_elf64_load(s, memory_mapping, phdr_index++, offset, 499 filesz, errp); 500 } else { 501 write_elf32_load(s, memory_mapping, phdr_index++, offset, 502 filesz, errp); 503 } 504 505 if (*errp) { 506 return; 507 } 508 509 if (phdr_index >= s->phdr_num) { 510 break; 511 } 512 } 513 } 514 515 /* write elf header, PT_NOTE and elf note to vmcore. */ 516 static void dump_begin(DumpState *s, Error **errp) 517 { 518 ERRP_GUARD(); 519 520 /* 521 * the vmcore's format is: 522 * -------------- 523 * | elf header | 524 * -------------- 525 * | PT_NOTE | 526 * -------------- 527 * | PT_LOAD | 528 * -------------- 529 * | ...... | 530 * -------------- 531 * | PT_LOAD | 532 * -------------- 533 * | sec_hdr | 534 * -------------- 535 * | elf note | 536 * -------------- 537 * | memory | 538 * -------------- 539 * 540 * we only know where the memory is saved after we write elf note into 541 * vmcore. 542 */ 543 544 /* write elf header to vmcore */ 545 if (s->dump_info.d_class == ELFCLASS64) { 546 write_elf64_header(s, errp); 547 } else { 548 write_elf32_header(s, errp); 549 } 550 if (*errp) { 551 return; 552 } 553 554 if (s->dump_info.d_class == ELFCLASS64) { 555 /* write PT_NOTE to vmcore */ 556 write_elf64_note(s, errp); 557 if (*errp) { 558 return; 559 } 560 561 /* write all PT_LOAD to vmcore */ 562 write_elf_loads(s, errp); 563 if (*errp) { 564 return; 565 } 566 567 /* write section to vmcore */ 568 if (s->have_section) { 569 write_elf_section(s, 1, errp); 570 if (*errp) { 571 return; 572 } 573 } 574 575 /* write notes to vmcore */ 576 write_elf64_notes(fd_write_vmcore, s, errp); 577 if (*errp) { 578 return; 579 } 580 } else { 581 /* write PT_NOTE to vmcore */ 582 write_elf32_note(s, errp); 583 if (*errp) { 584 return; 585 } 586 587 /* write all PT_LOAD to vmcore */ 588 write_elf_loads(s, errp); 589 if (*errp) { 590 return; 591 } 592 593 /* write section to vmcore */ 594 if (s->have_section) { 595 write_elf_section(s, 0, errp); 596 if (*errp) { 597 return; 598 } 599 } 600 601 /* write notes to vmcore */ 602 write_elf32_notes(fd_write_vmcore, s, errp); 603 if (*errp) { 604 return; 605 } 606 } 607 } 608 609 static int get_next_block(DumpState *s, GuestPhysBlock *block) 610 { 611 while (1) { 612 block = QTAILQ_NEXT(block, next); 613 if (!block) { 614 /* no more block */ 615 return 1; 616 } 617 618 s->start = 0; 619 s->next_block = block; 620 if (s->has_filter) { 621 if (block->target_start >= s->begin + s->length || 622 block->target_end <= s->begin) { 623 /* This block is out of the range */ 624 continue; 625 } 626 627 if (s->begin > block->target_start) { 628 s->start = s->begin - block->target_start; 629 } 630 } 631 632 return 0; 633 } 634 } 635 636 /* write all memory to vmcore */ 637 static void dump_iterate(DumpState *s, Error **errp) 638 { 639 ERRP_GUARD(); 640 GuestPhysBlock *block; 641 int64_t size; 642 643 do { 644 block = s->next_block; 645 646 size = block->target_end - block->target_start; 647 if (s->has_filter) { 648 size -= s->start; 649 if (s->begin + s->length < block->target_end) { 650 size -= block->target_end - (s->begin + s->length); 651 } 652 } 653 write_memory(s, block, s->start, size, errp); 654 if (*errp) { 655 return; 656 } 657 658 } while (!get_next_block(s, block)); 659 } 660 661 static void create_vmcore(DumpState *s, Error **errp) 662 { 663 ERRP_GUARD(); 664 665 dump_begin(s, errp); 666 if (*errp) { 667 return; 668 } 669 670 dump_iterate(s, errp); 671 } 672 673 static int write_start_flat_header(int fd) 674 { 675 MakedumpfileHeader *mh; 676 int ret = 0; 677 678 QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); 679 mh = g_malloc0(MAX_SIZE_MDF_HEADER); 680 681 memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, 682 MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); 683 684 mh->type = cpu_to_be64(TYPE_FLAT_HEADER); 685 mh->version = cpu_to_be64(VERSION_FLAT_HEADER); 686 687 size_t written_size; 688 written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); 689 if (written_size != MAX_SIZE_MDF_HEADER) { 690 ret = -1; 691 } 692 693 g_free(mh); 694 return ret; 695 } 696 697 static int write_end_flat_header(int fd) 698 { 699 MakedumpfileDataHeader mdh; 700 701 mdh.offset = END_FLAG_FLAT_HEADER; 702 mdh.buf_size = END_FLAG_FLAT_HEADER; 703 704 size_t written_size; 705 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 706 if (written_size != sizeof(mdh)) { 707 return -1; 708 } 709 710 return 0; 711 } 712 713 static int write_buffer(int fd, off_t offset, const void *buf, size_t size) 714 { 715 size_t written_size; 716 MakedumpfileDataHeader mdh; 717 718 mdh.offset = cpu_to_be64(offset); 719 mdh.buf_size = cpu_to_be64(size); 720 721 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 722 if (written_size != sizeof(mdh)) { 723 return -1; 724 } 725 726 written_size = qemu_write_full(fd, buf, size); 727 if (written_size != size) { 728 return -1; 729 } 730 731 return 0; 732 } 733 734 static int buf_write_note(const void *buf, size_t size, void *opaque) 735 { 736 DumpState *s = opaque; 737 738 /* note_buf is not enough */ 739 if (s->note_buf_offset + size > s->note_size) { 740 return -1; 741 } 742 743 memcpy(s->note_buf + s->note_buf_offset, buf, size); 744 745 s->note_buf_offset += size; 746 747 return 0; 748 } 749 750 /* 751 * This function retrieves various sizes from an elf header. 752 * 753 * @note has to be a valid ELF note. The return sizes are unmodified 754 * (not padded or rounded up to be multiple of 4). 755 */ 756 static void get_note_sizes(DumpState *s, const void *note, 757 uint64_t *note_head_size, 758 uint64_t *name_size, 759 uint64_t *desc_size) 760 { 761 uint64_t note_head_sz; 762 uint64_t name_sz; 763 uint64_t desc_sz; 764 765 if (s->dump_info.d_class == ELFCLASS64) { 766 const Elf64_Nhdr *hdr = note; 767 note_head_sz = sizeof(Elf64_Nhdr); 768 name_sz = tswap64(hdr->n_namesz); 769 desc_sz = tswap64(hdr->n_descsz); 770 } else { 771 const Elf32_Nhdr *hdr = note; 772 note_head_sz = sizeof(Elf32_Nhdr); 773 name_sz = tswap32(hdr->n_namesz); 774 desc_sz = tswap32(hdr->n_descsz); 775 } 776 777 if (note_head_size) { 778 *note_head_size = note_head_sz; 779 } 780 if (name_size) { 781 *name_size = name_sz; 782 } 783 if (desc_size) { 784 *desc_size = desc_sz; 785 } 786 } 787 788 static bool note_name_equal(DumpState *s, 789 const uint8_t *note, const char *name) 790 { 791 int len = strlen(name) + 1; 792 uint64_t head_size, name_size; 793 794 get_note_sizes(s, note, &head_size, &name_size, NULL); 795 head_size = ROUND_UP(head_size, 4); 796 797 return name_size == len && memcmp(note + head_size, name, len) == 0; 798 } 799 800 /* write common header, sub header and elf note to vmcore */ 801 static void create_header32(DumpState *s, Error **errp) 802 { 803 ERRP_GUARD(); 804 DiskDumpHeader32 *dh = NULL; 805 KdumpSubHeader32 *kh = NULL; 806 size_t size; 807 uint32_t block_size; 808 uint32_t sub_hdr_size; 809 uint32_t bitmap_blocks; 810 uint32_t status = 0; 811 uint64_t offset_note; 812 813 /* write common header, the version of kdump-compressed format is 6th */ 814 size = sizeof(DiskDumpHeader32); 815 dh = g_malloc0(size); 816 817 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 818 dh->header_version = cpu_to_dump32(s, 6); 819 block_size = s->dump_info.page_size; 820 dh->block_size = cpu_to_dump32(s, block_size); 821 sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; 822 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 823 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 824 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 825 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 826 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 827 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 828 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 829 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 830 831 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 832 status |= DUMP_DH_COMPRESSED_ZLIB; 833 } 834 #ifdef CONFIG_LZO 835 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 836 status |= DUMP_DH_COMPRESSED_LZO; 837 } 838 #endif 839 #ifdef CONFIG_SNAPPY 840 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 841 status |= DUMP_DH_COMPRESSED_SNAPPY; 842 } 843 #endif 844 dh->status = cpu_to_dump32(s, status); 845 846 if (write_buffer(s->fd, 0, dh, size) < 0) { 847 error_setg(errp, "dump: failed to write disk dump header"); 848 goto out; 849 } 850 851 /* write sub header */ 852 size = sizeof(KdumpSubHeader32); 853 kh = g_malloc0(size); 854 855 /* 64bit max_mapnr_64 */ 856 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 857 kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); 858 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 859 860 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 861 if (s->guest_note && 862 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 863 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 864 865 get_note_sizes(s, s->guest_note, 866 &hsize, &name_size, &size_vmcoreinfo_desc); 867 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 868 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 869 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 870 kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); 871 } 872 873 kh->offset_note = cpu_to_dump64(s, offset_note); 874 kh->note_size = cpu_to_dump32(s, s->note_size); 875 876 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 877 block_size, kh, size) < 0) { 878 error_setg(errp, "dump: failed to write kdump sub header"); 879 goto out; 880 } 881 882 /* write note */ 883 s->note_buf = g_malloc0(s->note_size); 884 s->note_buf_offset = 0; 885 886 /* use s->note_buf to store notes temporarily */ 887 write_elf32_notes(buf_write_note, s, errp); 888 if (*errp) { 889 goto out; 890 } 891 if (write_buffer(s->fd, offset_note, s->note_buf, 892 s->note_size) < 0) { 893 error_setg(errp, "dump: failed to write notes"); 894 goto out; 895 } 896 897 /* get offset of dump_bitmap */ 898 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 899 block_size; 900 901 /* get offset of page */ 902 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 903 block_size; 904 905 out: 906 g_free(dh); 907 g_free(kh); 908 g_free(s->note_buf); 909 } 910 911 /* write common header, sub header and elf note to vmcore */ 912 static void create_header64(DumpState *s, Error **errp) 913 { 914 ERRP_GUARD(); 915 DiskDumpHeader64 *dh = NULL; 916 KdumpSubHeader64 *kh = NULL; 917 size_t size; 918 uint32_t block_size; 919 uint32_t sub_hdr_size; 920 uint32_t bitmap_blocks; 921 uint32_t status = 0; 922 uint64_t offset_note; 923 924 /* write common header, the version of kdump-compressed format is 6th */ 925 size = sizeof(DiskDumpHeader64); 926 dh = g_malloc0(size); 927 928 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 929 dh->header_version = cpu_to_dump32(s, 6); 930 block_size = s->dump_info.page_size; 931 dh->block_size = cpu_to_dump32(s, block_size); 932 sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; 933 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 934 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 935 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 936 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 937 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 938 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 939 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 940 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 941 942 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 943 status |= DUMP_DH_COMPRESSED_ZLIB; 944 } 945 #ifdef CONFIG_LZO 946 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 947 status |= DUMP_DH_COMPRESSED_LZO; 948 } 949 #endif 950 #ifdef CONFIG_SNAPPY 951 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 952 status |= DUMP_DH_COMPRESSED_SNAPPY; 953 } 954 #endif 955 dh->status = cpu_to_dump32(s, status); 956 957 if (write_buffer(s->fd, 0, dh, size) < 0) { 958 error_setg(errp, "dump: failed to write disk dump header"); 959 goto out; 960 } 961 962 /* write sub header */ 963 size = sizeof(KdumpSubHeader64); 964 kh = g_malloc0(size); 965 966 /* 64bit max_mapnr_64 */ 967 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 968 kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); 969 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 970 971 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 972 if (s->guest_note && 973 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 974 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 975 976 get_note_sizes(s, s->guest_note, 977 &hsize, &name_size, &size_vmcoreinfo_desc); 978 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 979 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 980 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 981 kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); 982 } 983 984 kh->offset_note = cpu_to_dump64(s, offset_note); 985 kh->note_size = cpu_to_dump64(s, s->note_size); 986 987 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 988 block_size, kh, size) < 0) { 989 error_setg(errp, "dump: failed to write kdump sub header"); 990 goto out; 991 } 992 993 /* write note */ 994 s->note_buf = g_malloc0(s->note_size); 995 s->note_buf_offset = 0; 996 997 /* use s->note_buf to store notes temporarily */ 998 write_elf64_notes(buf_write_note, s, errp); 999 if (*errp) { 1000 goto out; 1001 } 1002 1003 if (write_buffer(s->fd, offset_note, s->note_buf, 1004 s->note_size) < 0) { 1005 error_setg(errp, "dump: failed to write notes"); 1006 goto out; 1007 } 1008 1009 /* get offset of dump_bitmap */ 1010 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 1011 block_size; 1012 1013 /* get offset of page */ 1014 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 1015 block_size; 1016 1017 out: 1018 g_free(dh); 1019 g_free(kh); 1020 g_free(s->note_buf); 1021 } 1022 1023 static void write_dump_header(DumpState *s, Error **errp) 1024 { 1025 if (s->dump_info.d_class == ELFCLASS32) { 1026 create_header32(s, errp); 1027 } else { 1028 create_header64(s, errp); 1029 } 1030 } 1031 1032 static size_t dump_bitmap_get_bufsize(DumpState *s) 1033 { 1034 return s->dump_info.page_size; 1035 } 1036 1037 /* 1038 * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be 1039 * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. 1040 * set_dump_bitmap will always leave the recently set bit un-sync. And setting 1041 * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into 1042 * vmcore, ie. synchronizing un-sync bit into vmcore. 1043 */ 1044 static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, 1045 uint8_t *buf, DumpState *s) 1046 { 1047 off_t old_offset, new_offset; 1048 off_t offset_bitmap1, offset_bitmap2; 1049 uint32_t byte, bit; 1050 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1051 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1052 1053 /* should not set the previous place */ 1054 assert(last_pfn <= pfn); 1055 1056 /* 1057 * if the bit needed to be set is not cached in buf, flush the data in buf 1058 * to vmcore firstly. 1059 * making new_offset be bigger than old_offset can also sync remained data 1060 * into vmcore. 1061 */ 1062 old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); 1063 new_offset = bitmap_bufsize * (pfn / bits_per_buf); 1064 1065 while (old_offset < new_offset) { 1066 /* calculate the offset and write dump_bitmap */ 1067 offset_bitmap1 = s->offset_dump_bitmap + old_offset; 1068 if (write_buffer(s->fd, offset_bitmap1, buf, 1069 bitmap_bufsize) < 0) { 1070 return -1; 1071 } 1072 1073 /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ 1074 offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + 1075 old_offset; 1076 if (write_buffer(s->fd, offset_bitmap2, buf, 1077 bitmap_bufsize) < 0) { 1078 return -1; 1079 } 1080 1081 memset(buf, 0, bitmap_bufsize); 1082 old_offset += bitmap_bufsize; 1083 } 1084 1085 /* get the exact place of the bit in the buf, and set it */ 1086 byte = (pfn % bits_per_buf) / CHAR_BIT; 1087 bit = (pfn % bits_per_buf) % CHAR_BIT; 1088 if (value) { 1089 buf[byte] |= 1u << bit; 1090 } else { 1091 buf[byte] &= ~(1u << bit); 1092 } 1093 1094 return 0; 1095 } 1096 1097 static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) 1098 { 1099 int target_page_shift = ctz32(s->dump_info.page_size); 1100 1101 return (addr >> target_page_shift) - ARCH_PFN_OFFSET; 1102 } 1103 1104 static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) 1105 { 1106 int target_page_shift = ctz32(s->dump_info.page_size); 1107 1108 return (pfn + ARCH_PFN_OFFSET) << target_page_shift; 1109 } 1110 1111 /* 1112 * exam every page and return the page frame number and the address of the page. 1113 * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys 1114 * blocks, so block->target_start and block->target_end should be interal 1115 * multiples of the target page size. 1116 */ 1117 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, 1118 uint8_t **bufptr, DumpState *s) 1119 { 1120 GuestPhysBlock *block = *blockptr; 1121 hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); 1122 uint8_t *buf; 1123 1124 /* block == NULL means the start of the iteration */ 1125 if (!block) { 1126 block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1127 *blockptr = block; 1128 assert((block->target_start & ~target_page_mask) == 0); 1129 assert((block->target_end & ~target_page_mask) == 0); 1130 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1131 if (bufptr) { 1132 *bufptr = block->host_addr; 1133 } 1134 return true; 1135 } 1136 1137 *pfnptr = *pfnptr + 1; 1138 addr = dump_pfn_to_paddr(s, *pfnptr); 1139 1140 if ((addr >= block->target_start) && 1141 (addr + s->dump_info.page_size <= block->target_end)) { 1142 buf = block->host_addr + (addr - block->target_start); 1143 } else { 1144 /* the next page is in the next block */ 1145 block = QTAILQ_NEXT(block, next); 1146 *blockptr = block; 1147 if (!block) { 1148 return false; 1149 } 1150 assert((block->target_start & ~target_page_mask) == 0); 1151 assert((block->target_end & ~target_page_mask) == 0); 1152 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1153 buf = block->host_addr; 1154 } 1155 1156 if (bufptr) { 1157 *bufptr = buf; 1158 } 1159 1160 return true; 1161 } 1162 1163 static void write_dump_bitmap(DumpState *s, Error **errp) 1164 { 1165 int ret = 0; 1166 uint64_t last_pfn, pfn; 1167 void *dump_bitmap_buf; 1168 size_t num_dumpable; 1169 GuestPhysBlock *block_iter = NULL; 1170 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1171 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1172 1173 /* dump_bitmap_buf is used to store dump_bitmap temporarily */ 1174 dump_bitmap_buf = g_malloc0(bitmap_bufsize); 1175 1176 num_dumpable = 0; 1177 last_pfn = 0; 1178 1179 /* 1180 * exam memory page by page, and set the bit in dump_bitmap corresponded 1181 * to the existing page. 1182 */ 1183 while (get_next_page(&block_iter, &pfn, NULL, s)) { 1184 ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); 1185 if (ret < 0) { 1186 error_setg(errp, "dump: failed to set dump_bitmap"); 1187 goto out; 1188 } 1189 1190 last_pfn = pfn; 1191 num_dumpable++; 1192 } 1193 1194 /* 1195 * set_dump_bitmap will always leave the recently set bit un-sync. Here we 1196 * set the remaining bits from last_pfn to the end of the bitmap buffer to 1197 * 0. With those set, the un-sync bit will be synchronized into the vmcore. 1198 */ 1199 if (num_dumpable > 0) { 1200 ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, 1201 dump_bitmap_buf, s); 1202 if (ret < 0) { 1203 error_setg(errp, "dump: failed to sync dump_bitmap"); 1204 goto out; 1205 } 1206 } 1207 1208 /* number of dumpable pages that will be dumped later */ 1209 s->num_dumpable = num_dumpable; 1210 1211 out: 1212 g_free(dump_bitmap_buf); 1213 } 1214 1215 static void prepare_data_cache(DataCache *data_cache, DumpState *s, 1216 off_t offset) 1217 { 1218 data_cache->fd = s->fd; 1219 data_cache->data_size = 0; 1220 data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); 1221 data_cache->buf = g_malloc0(data_cache->buf_size); 1222 data_cache->offset = offset; 1223 } 1224 1225 static int write_cache(DataCache *dc, const void *buf, size_t size, 1226 bool flag_sync) 1227 { 1228 /* 1229 * dc->buf_size should not be less than size, otherwise dc will never be 1230 * enough 1231 */ 1232 assert(size <= dc->buf_size); 1233 1234 /* 1235 * if flag_sync is set, synchronize data in dc->buf into vmcore. 1236 * otherwise check if the space is enough for caching data in buf, if not, 1237 * write the data in dc->buf to dc->fd and reset dc->buf 1238 */ 1239 if ((!flag_sync && dc->data_size + size > dc->buf_size) || 1240 (flag_sync && dc->data_size > 0)) { 1241 if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { 1242 return -1; 1243 } 1244 1245 dc->offset += dc->data_size; 1246 dc->data_size = 0; 1247 } 1248 1249 if (!flag_sync) { 1250 memcpy(dc->buf + dc->data_size, buf, size); 1251 dc->data_size += size; 1252 } 1253 1254 return 0; 1255 } 1256 1257 static void free_data_cache(DataCache *data_cache) 1258 { 1259 g_free(data_cache->buf); 1260 } 1261 1262 static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) 1263 { 1264 switch (flag_compress) { 1265 case DUMP_DH_COMPRESSED_ZLIB: 1266 return compressBound(page_size); 1267 1268 case DUMP_DH_COMPRESSED_LZO: 1269 /* 1270 * LZO will expand incompressible data by a little amount. Please check 1271 * the following URL to see the expansion calculation: 1272 * http://www.oberhumer.com/opensource/lzo/lzofaq.php 1273 */ 1274 return page_size + page_size / 16 + 64 + 3; 1275 1276 #ifdef CONFIG_SNAPPY 1277 case DUMP_DH_COMPRESSED_SNAPPY: 1278 return snappy_max_compressed_length(page_size); 1279 #endif 1280 } 1281 return 0; 1282 } 1283 1284 static void write_dump_pages(DumpState *s, Error **errp) 1285 { 1286 int ret = 0; 1287 DataCache page_desc, page_data; 1288 size_t len_buf_out, size_out; 1289 #ifdef CONFIG_LZO 1290 lzo_bytep wrkmem = NULL; 1291 #endif 1292 uint8_t *buf_out = NULL; 1293 off_t offset_desc, offset_data; 1294 PageDescriptor pd, pd_zero; 1295 uint8_t *buf; 1296 GuestPhysBlock *block_iter = NULL; 1297 uint64_t pfn_iter; 1298 1299 /* get offset of page_desc and page_data in dump file */ 1300 offset_desc = s->offset_page; 1301 offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; 1302 1303 prepare_data_cache(&page_desc, s, offset_desc); 1304 prepare_data_cache(&page_data, s, offset_data); 1305 1306 /* prepare buffer to store compressed data */ 1307 len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); 1308 assert(len_buf_out != 0); 1309 1310 #ifdef CONFIG_LZO 1311 wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); 1312 #endif 1313 1314 buf_out = g_malloc(len_buf_out); 1315 1316 /* 1317 * init zero page's page_desc and page_data, because every zero page 1318 * uses the same page_data 1319 */ 1320 pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); 1321 pd_zero.flags = cpu_to_dump32(s, 0); 1322 pd_zero.offset = cpu_to_dump64(s, offset_data); 1323 pd_zero.page_flags = cpu_to_dump64(s, 0); 1324 buf = g_malloc0(s->dump_info.page_size); 1325 ret = write_cache(&page_data, buf, s->dump_info.page_size, false); 1326 g_free(buf); 1327 if (ret < 0) { 1328 error_setg(errp, "dump: failed to write page data (zero page)"); 1329 goto out; 1330 } 1331 1332 offset_data += s->dump_info.page_size; 1333 1334 /* 1335 * dump memory to vmcore page by page. zero page will all be resided in the 1336 * first page of page section 1337 */ 1338 while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { 1339 /* check zero page */ 1340 if (buffer_is_zero(buf, s->dump_info.page_size)) { 1341 ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), 1342 false); 1343 if (ret < 0) { 1344 error_setg(errp, "dump: failed to write page desc"); 1345 goto out; 1346 } 1347 } else { 1348 /* 1349 * not zero page, then: 1350 * 1. compress the page 1351 * 2. write the compressed page into the cache of page_data 1352 * 3. get page desc of the compressed page and write it into the 1353 * cache of page_desc 1354 * 1355 * only one compression format will be used here, for 1356 * s->flag_compress is set. But when compression fails to work, 1357 * we fall back to save in plaintext. 1358 */ 1359 size_out = len_buf_out; 1360 if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && 1361 (compress2(buf_out, (uLongf *)&size_out, buf, 1362 s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && 1363 (size_out < s->dump_info.page_size)) { 1364 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); 1365 pd.size = cpu_to_dump32(s, size_out); 1366 1367 ret = write_cache(&page_data, buf_out, size_out, false); 1368 if (ret < 0) { 1369 error_setg(errp, "dump: failed to write page data"); 1370 goto out; 1371 } 1372 #ifdef CONFIG_LZO 1373 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && 1374 (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, 1375 (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && 1376 (size_out < s->dump_info.page_size)) { 1377 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); 1378 pd.size = cpu_to_dump32(s, size_out); 1379 1380 ret = write_cache(&page_data, buf_out, size_out, false); 1381 if (ret < 0) { 1382 error_setg(errp, "dump: failed to write page data"); 1383 goto out; 1384 } 1385 #endif 1386 #ifdef CONFIG_SNAPPY 1387 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && 1388 (snappy_compress((char *)buf, s->dump_info.page_size, 1389 (char *)buf_out, &size_out) == SNAPPY_OK) && 1390 (size_out < s->dump_info.page_size)) { 1391 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); 1392 pd.size = cpu_to_dump32(s, size_out); 1393 1394 ret = write_cache(&page_data, buf_out, size_out, false); 1395 if (ret < 0) { 1396 error_setg(errp, "dump: failed to write page data"); 1397 goto out; 1398 } 1399 #endif 1400 } else { 1401 /* 1402 * fall back to save in plaintext, size_out should be 1403 * assigned the target's page size 1404 */ 1405 pd.flags = cpu_to_dump32(s, 0); 1406 size_out = s->dump_info.page_size; 1407 pd.size = cpu_to_dump32(s, size_out); 1408 1409 ret = write_cache(&page_data, buf, 1410 s->dump_info.page_size, false); 1411 if (ret < 0) { 1412 error_setg(errp, "dump: failed to write page data"); 1413 goto out; 1414 } 1415 } 1416 1417 /* get and write page desc here */ 1418 pd.page_flags = cpu_to_dump64(s, 0); 1419 pd.offset = cpu_to_dump64(s, offset_data); 1420 offset_data += size_out; 1421 1422 ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); 1423 if (ret < 0) { 1424 error_setg(errp, "dump: failed to write page desc"); 1425 goto out; 1426 } 1427 } 1428 s->written_size += s->dump_info.page_size; 1429 } 1430 1431 ret = write_cache(&page_desc, NULL, 0, true); 1432 if (ret < 0) { 1433 error_setg(errp, "dump: failed to sync cache for page_desc"); 1434 goto out; 1435 } 1436 ret = write_cache(&page_data, NULL, 0, true); 1437 if (ret < 0) { 1438 error_setg(errp, "dump: failed to sync cache for page_data"); 1439 goto out; 1440 } 1441 1442 out: 1443 free_data_cache(&page_desc); 1444 free_data_cache(&page_data); 1445 1446 #ifdef CONFIG_LZO 1447 g_free(wrkmem); 1448 #endif 1449 1450 g_free(buf_out); 1451 } 1452 1453 static void create_kdump_vmcore(DumpState *s, Error **errp) 1454 { 1455 ERRP_GUARD(); 1456 int ret; 1457 1458 /* 1459 * the kdump-compressed format is: 1460 * File offset 1461 * +------------------------------------------+ 0x0 1462 * | main header (struct disk_dump_header) | 1463 * |------------------------------------------+ block 1 1464 * | sub header (struct kdump_sub_header) | 1465 * |------------------------------------------+ block 2 1466 * | 1st-dump_bitmap | 1467 * |------------------------------------------+ block 2 + X blocks 1468 * | 2nd-dump_bitmap | (aligned by block) 1469 * |------------------------------------------+ block 2 + 2 * X blocks 1470 * | page desc for pfn 0 (struct page_desc) | (aligned by block) 1471 * | page desc for pfn 1 (struct page_desc) | 1472 * | : | 1473 * |------------------------------------------| (not aligned by block) 1474 * | page data (pfn 0) | 1475 * | page data (pfn 1) | 1476 * | : | 1477 * +------------------------------------------+ 1478 */ 1479 1480 ret = write_start_flat_header(s->fd); 1481 if (ret < 0) { 1482 error_setg(errp, "dump: failed to write start flat header"); 1483 return; 1484 } 1485 1486 write_dump_header(s, errp); 1487 if (*errp) { 1488 return; 1489 } 1490 1491 write_dump_bitmap(s, errp); 1492 if (*errp) { 1493 return; 1494 } 1495 1496 write_dump_pages(s, errp); 1497 if (*errp) { 1498 return; 1499 } 1500 1501 ret = write_end_flat_header(s->fd); 1502 if (ret < 0) { 1503 error_setg(errp, "dump: failed to write end flat header"); 1504 return; 1505 } 1506 } 1507 1508 static ram_addr_t get_start_block(DumpState *s) 1509 { 1510 GuestPhysBlock *block; 1511 1512 if (!s->has_filter) { 1513 s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1514 return 0; 1515 } 1516 1517 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1518 if (block->target_start >= s->begin + s->length || 1519 block->target_end <= s->begin) { 1520 /* This block is out of the range */ 1521 continue; 1522 } 1523 1524 s->next_block = block; 1525 if (s->begin > block->target_start) { 1526 s->start = s->begin - block->target_start; 1527 } else { 1528 s->start = 0; 1529 } 1530 return s->start; 1531 } 1532 1533 return -1; 1534 } 1535 1536 static void get_max_mapnr(DumpState *s) 1537 { 1538 GuestPhysBlock *last_block; 1539 1540 last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); 1541 s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); 1542 } 1543 1544 static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; 1545 1546 static void dump_state_prepare(DumpState *s) 1547 { 1548 /* zero the struct, setting status to active */ 1549 *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; 1550 } 1551 1552 bool qemu_system_dump_in_progress(void) 1553 { 1554 DumpState *state = &dump_state_global; 1555 return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE); 1556 } 1557 1558 /* calculate total size of memory to be dumped (taking filter into 1559 * acoount.) */ 1560 static int64_t dump_calculate_size(DumpState *s) 1561 { 1562 GuestPhysBlock *block; 1563 int64_t size = 0, total = 0, left = 0, right = 0; 1564 1565 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1566 if (s->has_filter) { 1567 /* calculate the overlapped region. */ 1568 left = MAX(s->begin, block->target_start); 1569 right = MIN(s->begin + s->length, block->target_end); 1570 size = right - left; 1571 size = size > 0 ? size : 0; 1572 } else { 1573 /* count the whole region in */ 1574 size = (block->target_end - block->target_start); 1575 } 1576 total += size; 1577 } 1578 1579 return total; 1580 } 1581 1582 static void vmcoreinfo_update_phys_base(DumpState *s) 1583 { 1584 uint64_t size, note_head_size, name_size, phys_base; 1585 char **lines; 1586 uint8_t *vmci; 1587 size_t i; 1588 1589 if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { 1590 return; 1591 } 1592 1593 get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); 1594 note_head_size = ROUND_UP(note_head_size, 4); 1595 1596 vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); 1597 *(vmci + size) = '\0'; 1598 1599 lines = g_strsplit((char *)vmci, "\n", -1); 1600 for (i = 0; lines[i]; i++) { 1601 const char *prefix = NULL; 1602 1603 if (s->dump_info.d_machine == EM_X86_64) { 1604 prefix = "NUMBER(phys_base)="; 1605 } else if (s->dump_info.d_machine == EM_AARCH64) { 1606 prefix = "NUMBER(PHYS_OFFSET)="; 1607 } 1608 1609 if (prefix && g_str_has_prefix(lines[i], prefix)) { 1610 if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, 1611 &phys_base) < 0) { 1612 warn_report("Failed to read %s", prefix); 1613 } else { 1614 s->dump_info.phys_base = phys_base; 1615 } 1616 break; 1617 } 1618 } 1619 1620 g_strfreev(lines); 1621 } 1622 1623 static void dump_init(DumpState *s, int fd, bool has_format, 1624 DumpGuestMemoryFormat format, bool paging, bool has_filter, 1625 int64_t begin, int64_t length, Error **errp) 1626 { 1627 ERRP_GUARD(); 1628 VMCoreInfoState *vmci = vmcoreinfo_find(); 1629 CPUState *cpu; 1630 int nr_cpus; 1631 int ret; 1632 1633 s->has_format = has_format; 1634 s->format = format; 1635 s->written_size = 0; 1636 1637 /* kdump-compressed is conflict with paging and filter */ 1638 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1639 assert(!paging && !has_filter); 1640 } 1641 1642 if (runstate_is_running()) { 1643 vm_stop(RUN_STATE_SAVE_VM); 1644 s->resume = true; 1645 } else { 1646 s->resume = false; 1647 } 1648 1649 /* If we use KVM, we should synchronize the registers before we get dump 1650 * info or physmap info. 1651 */ 1652 cpu_synchronize_all_states(); 1653 nr_cpus = 0; 1654 CPU_FOREACH(cpu) { 1655 nr_cpus++; 1656 } 1657 1658 s->fd = fd; 1659 s->has_filter = has_filter; 1660 s->begin = begin; 1661 s->length = length; 1662 1663 memory_mapping_list_init(&s->list); 1664 1665 guest_phys_blocks_init(&s->guest_phys_blocks); 1666 guest_phys_blocks_append(&s->guest_phys_blocks); 1667 s->total_size = dump_calculate_size(s); 1668 #ifdef DEBUG_DUMP_GUEST_MEMORY 1669 fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); 1670 #endif 1671 1672 /* it does not make sense to dump non-existent memory */ 1673 if (!s->total_size) { 1674 error_setg(errp, "dump: no guest memory to dump"); 1675 goto cleanup; 1676 } 1677 1678 s->start = get_start_block(s); 1679 if (s->start == -1) { 1680 error_setg(errp, QERR_INVALID_PARAMETER, "begin"); 1681 goto cleanup; 1682 } 1683 1684 /* get dump info: endian, class and architecture. 1685 * If the target architecture is not supported, cpu_get_dump_info() will 1686 * return -1. 1687 */ 1688 ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); 1689 if (ret < 0) { 1690 error_setg(errp, QERR_UNSUPPORTED); 1691 goto cleanup; 1692 } 1693 1694 if (!s->dump_info.page_size) { 1695 s->dump_info.page_size = TARGET_PAGE_SIZE; 1696 } 1697 1698 s->note_size = cpu_get_note_size(s->dump_info.d_class, 1699 s->dump_info.d_machine, nr_cpus); 1700 if (s->note_size < 0) { 1701 error_setg(errp, QERR_UNSUPPORTED); 1702 goto cleanup; 1703 } 1704 1705 /* 1706 * The goal of this block is to (a) update the previously guessed 1707 * phys_base, (b) copy the guest note out of the guest. 1708 * Failure to do so is not fatal for dumping. 1709 */ 1710 if (vmci) { 1711 uint64_t addr, note_head_size, name_size, desc_size; 1712 uint32_t size; 1713 uint16_t format; 1714 1715 note_head_size = s->dump_info.d_class == ELFCLASS32 ? 1716 sizeof(Elf32_Nhdr) : sizeof(Elf64_Nhdr); 1717 1718 format = le16_to_cpu(vmci->vmcoreinfo.guest_format); 1719 size = le32_to_cpu(vmci->vmcoreinfo.size); 1720 addr = le64_to_cpu(vmci->vmcoreinfo.paddr); 1721 if (!vmci->has_vmcoreinfo) { 1722 warn_report("guest note is not present"); 1723 } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { 1724 warn_report("guest note size is invalid: %" PRIu32, size); 1725 } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { 1726 warn_report("guest note format is unsupported: %" PRIu16, format); 1727 } else { 1728 s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ 1729 cpu_physical_memory_read(addr, s->guest_note, size); 1730 1731 get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); 1732 s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, 1733 desc_size); 1734 if (name_size > MAX_GUEST_NOTE_SIZE || 1735 desc_size > MAX_GUEST_NOTE_SIZE || 1736 s->guest_note_size > size) { 1737 warn_report("Invalid guest note header"); 1738 g_free(s->guest_note); 1739 s->guest_note = NULL; 1740 } else { 1741 vmcoreinfo_update_phys_base(s); 1742 s->note_size += s->guest_note_size; 1743 } 1744 } 1745 } 1746 1747 /* get memory mapping */ 1748 if (paging) { 1749 qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, errp); 1750 if (*errp) { 1751 goto cleanup; 1752 } 1753 } else { 1754 qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); 1755 } 1756 1757 s->nr_cpus = nr_cpus; 1758 1759 get_max_mapnr(s); 1760 1761 uint64_t tmp; 1762 tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), 1763 s->dump_info.page_size); 1764 s->len_dump_bitmap = tmp * s->dump_info.page_size; 1765 1766 /* init for kdump-compressed format */ 1767 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1768 switch (format) { 1769 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: 1770 s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; 1771 break; 1772 1773 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: 1774 #ifdef CONFIG_LZO 1775 if (lzo_init() != LZO_E_OK) { 1776 error_setg(errp, "failed to initialize the LZO library"); 1777 goto cleanup; 1778 } 1779 #endif 1780 s->flag_compress = DUMP_DH_COMPRESSED_LZO; 1781 break; 1782 1783 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: 1784 s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; 1785 break; 1786 1787 default: 1788 s->flag_compress = 0; 1789 } 1790 1791 return; 1792 } 1793 1794 if (s->has_filter) { 1795 memory_mapping_filter(&s->list, s->begin, s->length); 1796 } 1797 1798 /* 1799 * calculate phdr_num 1800 * 1801 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow 1802 */ 1803 s->phdr_num = 1; /* PT_NOTE */ 1804 if (s->list.num < UINT16_MAX - 2) { 1805 s->phdr_num += s->list.num; 1806 s->have_section = false; 1807 } else { 1808 /* sh_info of section 0 holds the real number of phdrs */ 1809 s->have_section = true; 1810 1811 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ 1812 if (s->list.num <= UINT32_MAX - 1) { 1813 s->phdr_num += s->list.num; 1814 } else { 1815 s->phdr_num = UINT32_MAX; 1816 } 1817 } 1818 1819 if (s->dump_info.d_class == ELFCLASS64) { 1820 if (s->have_section) { 1821 s->memory_offset = sizeof(Elf64_Ehdr) + 1822 sizeof(Elf64_Phdr) * s->phdr_num + 1823 sizeof(Elf64_Shdr) + s->note_size; 1824 } else { 1825 s->memory_offset = sizeof(Elf64_Ehdr) + 1826 sizeof(Elf64_Phdr) * s->phdr_num + s->note_size; 1827 } 1828 } else { 1829 if (s->have_section) { 1830 s->memory_offset = sizeof(Elf32_Ehdr) + 1831 sizeof(Elf32_Phdr) * s->phdr_num + 1832 sizeof(Elf32_Shdr) + s->note_size; 1833 } else { 1834 s->memory_offset = sizeof(Elf32_Ehdr) + 1835 sizeof(Elf32_Phdr) * s->phdr_num + s->note_size; 1836 } 1837 } 1838 1839 return; 1840 1841 cleanup: 1842 dump_cleanup(s); 1843 } 1844 1845 /* this operation might be time consuming. */ 1846 static void dump_process(DumpState *s, Error **errp) 1847 { 1848 ERRP_GUARD(); 1849 DumpQueryResult *result = NULL; 1850 1851 if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1852 #ifdef TARGET_X86_64 1853 create_win_dump(s, errp); 1854 #endif 1855 } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1856 create_kdump_vmcore(s, errp); 1857 } else { 1858 create_vmcore(s, errp); 1859 } 1860 1861 /* make sure status is written after written_size updates */ 1862 smp_wmb(); 1863 qatomic_set(&s->status, 1864 (*errp ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); 1865 1866 /* send DUMP_COMPLETED message (unconditionally) */ 1867 result = qmp_query_dump(NULL); 1868 /* should never fail */ 1869 assert(result); 1870 qapi_event_send_dump_completed(result, !!*errp, (*errp ? 1871 error_get_pretty(*errp) : NULL)); 1872 qapi_free_DumpQueryResult(result); 1873 1874 dump_cleanup(s); 1875 } 1876 1877 static void *dump_thread(void *data) 1878 { 1879 DumpState *s = (DumpState *)data; 1880 dump_process(s, NULL); 1881 return NULL; 1882 } 1883 1884 DumpQueryResult *qmp_query_dump(Error **errp) 1885 { 1886 DumpQueryResult *result = g_new(DumpQueryResult, 1); 1887 DumpState *state = &dump_state_global; 1888 result->status = qatomic_read(&state->status); 1889 /* make sure we are reading status and written_size in order */ 1890 smp_rmb(); 1891 result->completed = state->written_size; 1892 result->total = state->total_size; 1893 return result; 1894 } 1895 1896 void qmp_dump_guest_memory(bool paging, const char *file, 1897 bool has_detach, bool detach, 1898 bool has_begin, int64_t begin, bool has_length, 1899 int64_t length, bool has_format, 1900 DumpGuestMemoryFormat format, Error **errp) 1901 { 1902 ERRP_GUARD(); 1903 const char *p; 1904 int fd = -1; 1905 DumpState *s; 1906 bool detach_p = false; 1907 1908 if (runstate_check(RUN_STATE_INMIGRATE)) { 1909 error_setg(errp, "Dump not allowed during incoming migration."); 1910 return; 1911 } 1912 1913 /* if there is a dump in background, we should wait until the dump 1914 * finished */ 1915 if (qemu_system_dump_in_progress()) { 1916 error_setg(errp, "There is a dump in process, please wait."); 1917 return; 1918 } 1919 1920 /* 1921 * kdump-compressed format need the whole memory dumped, so paging or 1922 * filter is not supported here. 1923 */ 1924 if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && 1925 (paging || has_begin || has_length)) { 1926 error_setg(errp, "kdump-compressed format doesn't support paging or " 1927 "filter"); 1928 return; 1929 } 1930 if (has_begin && !has_length) { 1931 error_setg(errp, QERR_MISSING_PARAMETER, "length"); 1932 return; 1933 } 1934 if (!has_begin && has_length) { 1935 error_setg(errp, QERR_MISSING_PARAMETER, "begin"); 1936 return; 1937 } 1938 if (has_detach) { 1939 detach_p = detach; 1940 } 1941 1942 /* check whether lzo/snappy is supported */ 1943 #ifndef CONFIG_LZO 1944 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { 1945 error_setg(errp, "kdump-lzo is not available now"); 1946 return; 1947 } 1948 #endif 1949 1950 #ifndef CONFIG_SNAPPY 1951 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { 1952 error_setg(errp, "kdump-snappy is not available now"); 1953 return; 1954 } 1955 #endif 1956 1957 #ifndef TARGET_X86_64 1958 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1959 error_setg(errp, "Windows dump is only available for x86-64"); 1960 return; 1961 } 1962 #endif 1963 1964 #if !defined(WIN32) 1965 if (strstart(file, "fd:", &p)) { 1966 fd = monitor_get_fd(monitor_cur(), p, errp); 1967 if (fd == -1) { 1968 return; 1969 } 1970 } 1971 #endif 1972 1973 if (strstart(file, "file:", &p)) { 1974 fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); 1975 if (fd < 0) { 1976 error_setg_file_open(errp, errno, p); 1977 return; 1978 } 1979 } 1980 1981 if (fd == -1) { 1982 error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); 1983 return; 1984 } 1985 1986 if (!dump_migration_blocker) { 1987 error_setg(&dump_migration_blocker, 1988 "Live migration disabled: dump-guest-memory in progress"); 1989 } 1990 1991 /* 1992 * Allows even for -only-migratable, but forbid migration during the 1993 * process of dump guest memory. 1994 */ 1995 if (migrate_add_blocker_internal(dump_migration_blocker, errp)) { 1996 /* Remember to release the fd before passing it over to dump state */ 1997 close(fd); 1998 return; 1999 } 2000 2001 s = &dump_state_global; 2002 dump_state_prepare(s); 2003 2004 dump_init(s, fd, has_format, format, paging, has_begin, 2005 begin, length, errp); 2006 if (*errp) { 2007 qatomic_set(&s->status, DUMP_STATUS_FAILED); 2008 return; 2009 } 2010 2011 if (detach_p) { 2012 /* detached dump */ 2013 s->detached = true; 2014 qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, 2015 s, QEMU_THREAD_DETACHED); 2016 } else { 2017 /* sync dump */ 2018 dump_process(s, errp); 2019 } 2020 } 2021 2022 DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) 2023 { 2024 DumpGuestMemoryCapability *cap = 2025 g_new0(DumpGuestMemoryCapability, 1); 2026 DumpGuestMemoryFormatList **tail = &cap->formats; 2027 2028 /* elf is always available */ 2029 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_ELF); 2030 2031 /* kdump-zlib is always available */ 2032 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB); 2033 2034 /* add new item if kdump-lzo is available */ 2035 #ifdef CONFIG_LZO 2036 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO); 2037 #endif 2038 2039 /* add new item if kdump-snappy is available */ 2040 #ifdef CONFIG_SNAPPY 2041 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY); 2042 #endif 2043 2044 /* Windows dump is available only if target is x86_64 */ 2045 #ifdef TARGET_X86_64 2046 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_WIN_DMP); 2047 #endif 2048 2049 return cap; 2050 } 2051