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-common.h" 16 #include "qemu/cutils.h" 17 #include "elf.h" 18 #include "exec/hwaddr.h" 19 #include "monitor/monitor.h" 20 #include "sysemu/kvm.h" 21 #include "sysemu/dump.h" 22 #include "sysemu/memory_mapping.h" 23 #include "sysemu/runstate.h" 24 #include "sysemu/cpus.h" 25 #include "qapi/error.h" 26 #include "qapi/qapi-commands-dump.h" 27 #include "qapi/qapi-events-dump.h" 28 #include "qapi/qmp/qerror.h" 29 #include "qemu/error-report.h" 30 #include "qemu/main-loop.h" 31 #include "hw/misc/vmcoreinfo.h" 32 #include "migration/blocker.h" 33 34 #ifdef TARGET_X86_64 35 #include "win_dump.h" 36 #endif 37 38 #include <zlib.h> 39 #ifdef CONFIG_LZO 40 #include <lzo/lzo1x.h> 41 #endif 42 #ifdef CONFIG_SNAPPY 43 #include <snappy-c.h> 44 #endif 45 #ifndef ELF_MACHINE_UNAME 46 #define ELF_MACHINE_UNAME "Unknown" 47 #endif 48 49 #define MAX_GUEST_NOTE_SIZE (1 << 20) /* 1MB should be enough */ 50 51 static Error *dump_migration_blocker; 52 53 #define ELF_NOTE_SIZE(hdr_size, name_size, desc_size) \ 54 ((DIV_ROUND_UP((hdr_size), 4) + \ 55 DIV_ROUND_UP((name_size), 4) + \ 56 DIV_ROUND_UP((desc_size), 4)) * 4) 57 58 uint16_t cpu_to_dump16(DumpState *s, uint16_t val) 59 { 60 if (s->dump_info.d_endian == ELFDATA2LSB) { 61 val = cpu_to_le16(val); 62 } else { 63 val = cpu_to_be16(val); 64 } 65 66 return val; 67 } 68 69 uint32_t cpu_to_dump32(DumpState *s, uint32_t val) 70 { 71 if (s->dump_info.d_endian == ELFDATA2LSB) { 72 val = cpu_to_le32(val); 73 } else { 74 val = cpu_to_be32(val); 75 } 76 77 return val; 78 } 79 80 uint64_t cpu_to_dump64(DumpState *s, uint64_t val) 81 { 82 if (s->dump_info.d_endian == ELFDATA2LSB) { 83 val = cpu_to_le64(val); 84 } else { 85 val = cpu_to_be64(val); 86 } 87 88 return val; 89 } 90 91 static int dump_cleanup(DumpState *s) 92 { 93 guest_phys_blocks_free(&s->guest_phys_blocks); 94 memory_mapping_list_free(&s->list); 95 close(s->fd); 96 g_free(s->guest_note); 97 s->guest_note = NULL; 98 if (s->resume) { 99 if (s->detached) { 100 qemu_mutex_lock_iothread(); 101 } 102 vm_start(); 103 if (s->detached) { 104 qemu_mutex_unlock_iothread(); 105 } 106 } 107 migrate_del_blocker(dump_migration_blocker); 108 109 return 0; 110 } 111 112 static int fd_write_vmcore(const void *buf, size_t size, void *opaque) 113 { 114 DumpState *s = opaque; 115 size_t written_size; 116 117 written_size = qemu_write_full(s->fd, buf, size); 118 if (written_size != size) { 119 return -errno; 120 } 121 122 return 0; 123 } 124 125 static void write_elf64_header(DumpState *s, Error **errp) 126 { 127 Elf64_Ehdr elf_header; 128 int ret; 129 130 memset(&elf_header, 0, sizeof(Elf64_Ehdr)); 131 memcpy(&elf_header, ELFMAG, SELFMAG); 132 elf_header.e_ident[EI_CLASS] = ELFCLASS64; 133 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 134 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 135 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 136 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 137 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 138 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 139 elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); 140 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); 141 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); 142 if (s->have_section) { 143 uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; 144 145 elf_header.e_shoff = cpu_to_dump64(s, shoff); 146 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); 147 elf_header.e_shnum = cpu_to_dump16(s, 1); 148 } 149 150 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 151 if (ret < 0) { 152 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 153 } 154 } 155 156 static void write_elf32_header(DumpState *s, Error **errp) 157 { 158 Elf32_Ehdr elf_header; 159 int ret; 160 161 memset(&elf_header, 0, sizeof(Elf32_Ehdr)); 162 memcpy(&elf_header, ELFMAG, SELFMAG); 163 elf_header.e_ident[EI_CLASS] = ELFCLASS32; 164 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 165 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 166 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 167 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 168 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 169 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 170 elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); 171 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); 172 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); 173 if (s->have_section) { 174 uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; 175 176 elf_header.e_shoff = cpu_to_dump32(s, shoff); 177 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); 178 elf_header.e_shnum = cpu_to_dump16(s, 1); 179 } 180 181 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 182 if (ret < 0) { 183 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 184 } 185 } 186 187 static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, 188 int phdr_index, hwaddr offset, 189 hwaddr filesz, Error **errp) 190 { 191 Elf64_Phdr phdr; 192 int ret; 193 194 memset(&phdr, 0, sizeof(Elf64_Phdr)); 195 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 196 phdr.p_offset = cpu_to_dump64(s, offset); 197 phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); 198 phdr.p_filesz = cpu_to_dump64(s, filesz); 199 phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); 200 phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 201 202 assert(memory_mapping->length >= filesz); 203 204 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 205 if (ret < 0) { 206 error_setg_errno(errp, -ret, 207 "dump: failed to write program header table"); 208 } 209 } 210 211 static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, 212 int phdr_index, hwaddr offset, 213 hwaddr filesz, Error **errp) 214 { 215 Elf32_Phdr phdr; 216 int ret; 217 218 memset(&phdr, 0, sizeof(Elf32_Phdr)); 219 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 220 phdr.p_offset = cpu_to_dump32(s, offset); 221 phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); 222 phdr.p_filesz = cpu_to_dump32(s, filesz); 223 phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); 224 phdr.p_vaddr = 225 cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 226 227 assert(memory_mapping->length >= filesz); 228 229 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 230 if (ret < 0) { 231 error_setg_errno(errp, -ret, 232 "dump: failed to write program header table"); 233 } 234 } 235 236 static void write_elf64_note(DumpState *s, Error **errp) 237 { 238 Elf64_Phdr phdr; 239 hwaddr begin = s->memory_offset - s->note_size; 240 int ret; 241 242 memset(&phdr, 0, sizeof(Elf64_Phdr)); 243 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 244 phdr.p_offset = cpu_to_dump64(s, begin); 245 phdr.p_paddr = 0; 246 phdr.p_filesz = cpu_to_dump64(s, s->note_size); 247 phdr.p_memsz = cpu_to_dump64(s, s->note_size); 248 phdr.p_vaddr = 0; 249 250 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 251 if (ret < 0) { 252 error_setg_errno(errp, -ret, 253 "dump: failed to write program header table"); 254 } 255 } 256 257 static inline int cpu_index(CPUState *cpu) 258 { 259 return cpu->cpu_index + 1; 260 } 261 262 static void write_guest_note(WriteCoreDumpFunction f, DumpState *s, 263 Error **errp) 264 { 265 int ret; 266 267 if (s->guest_note) { 268 ret = f(s->guest_note, s->guest_note_size, s); 269 if (ret < 0) { 270 error_setg(errp, "dump: failed to write guest note"); 271 } 272 } 273 } 274 275 static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, 276 Error **errp) 277 { 278 CPUState *cpu; 279 int ret; 280 int id; 281 282 CPU_FOREACH(cpu) { 283 id = cpu_index(cpu); 284 ret = cpu_write_elf64_note(f, cpu, id, s); 285 if (ret < 0) { 286 error_setg(errp, "dump: failed to write elf notes"); 287 return; 288 } 289 } 290 291 CPU_FOREACH(cpu) { 292 ret = cpu_write_elf64_qemunote(f, cpu, s); 293 if (ret < 0) { 294 error_setg(errp, "dump: failed to write CPU status"); 295 return; 296 } 297 } 298 299 write_guest_note(f, s, errp); 300 } 301 302 static void write_elf32_note(DumpState *s, Error **errp) 303 { 304 hwaddr begin = s->memory_offset - s->note_size; 305 Elf32_Phdr phdr; 306 int ret; 307 308 memset(&phdr, 0, sizeof(Elf32_Phdr)); 309 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 310 phdr.p_offset = cpu_to_dump32(s, begin); 311 phdr.p_paddr = 0; 312 phdr.p_filesz = cpu_to_dump32(s, s->note_size); 313 phdr.p_memsz = cpu_to_dump32(s, s->note_size); 314 phdr.p_vaddr = 0; 315 316 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 317 if (ret < 0) { 318 error_setg_errno(errp, -ret, 319 "dump: failed to write program header table"); 320 } 321 } 322 323 static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, 324 Error **errp) 325 { 326 CPUState *cpu; 327 int ret; 328 int id; 329 330 CPU_FOREACH(cpu) { 331 id = cpu_index(cpu); 332 ret = cpu_write_elf32_note(f, cpu, id, s); 333 if (ret < 0) { 334 error_setg(errp, "dump: failed to write elf notes"); 335 return; 336 } 337 } 338 339 CPU_FOREACH(cpu) { 340 ret = cpu_write_elf32_qemunote(f, cpu, s); 341 if (ret < 0) { 342 error_setg(errp, "dump: failed to write CPU status"); 343 return; 344 } 345 } 346 347 write_guest_note(f, s, errp); 348 } 349 350 static void write_elf_section(DumpState *s, int type, Error **errp) 351 { 352 Elf32_Shdr shdr32; 353 Elf64_Shdr shdr64; 354 int shdr_size; 355 void *shdr; 356 int ret; 357 358 if (type == 0) { 359 shdr_size = sizeof(Elf32_Shdr); 360 memset(&shdr32, 0, shdr_size); 361 shdr32.sh_info = cpu_to_dump32(s, s->sh_info); 362 shdr = &shdr32; 363 } else { 364 shdr_size = sizeof(Elf64_Shdr); 365 memset(&shdr64, 0, shdr_size); 366 shdr64.sh_info = cpu_to_dump32(s, s->sh_info); 367 shdr = &shdr64; 368 } 369 370 ret = fd_write_vmcore(shdr, shdr_size, s); 371 if (ret < 0) { 372 error_setg_errno(errp, -ret, 373 "dump: failed to write section header table"); 374 } 375 } 376 377 static void write_data(DumpState *s, void *buf, int length, Error **errp) 378 { 379 int ret; 380 381 ret = fd_write_vmcore(buf, length, s); 382 if (ret < 0) { 383 error_setg_errno(errp, -ret, "dump: failed to save memory"); 384 } else { 385 s->written_size += length; 386 } 387 } 388 389 /* write the memory to vmcore. 1 page per I/O. */ 390 static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, 391 int64_t size, Error **errp) 392 { 393 int64_t i; 394 Error *local_err = NULL; 395 396 for (i = 0; i < size / s->dump_info.page_size; i++) { 397 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 398 s->dump_info.page_size, &local_err); 399 if (local_err) { 400 error_propagate(errp, local_err); 401 return; 402 } 403 } 404 405 if ((size % s->dump_info.page_size) != 0) { 406 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 407 size % s->dump_info.page_size, &local_err); 408 if (local_err) { 409 error_propagate(errp, local_err); 410 return; 411 } 412 } 413 } 414 415 /* get the memory's offset and size in the vmcore */ 416 static void get_offset_range(hwaddr phys_addr, 417 ram_addr_t mapping_length, 418 DumpState *s, 419 hwaddr *p_offset, 420 hwaddr *p_filesz) 421 { 422 GuestPhysBlock *block; 423 hwaddr offset = s->memory_offset; 424 int64_t size_in_block, start; 425 426 /* When the memory is not stored into vmcore, offset will be -1 */ 427 *p_offset = -1; 428 *p_filesz = 0; 429 430 if (s->has_filter) { 431 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { 432 return; 433 } 434 } 435 436 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 437 if (s->has_filter) { 438 if (block->target_start >= s->begin + s->length || 439 block->target_end <= s->begin) { 440 /* This block is out of the range */ 441 continue; 442 } 443 444 if (s->begin <= block->target_start) { 445 start = block->target_start; 446 } else { 447 start = s->begin; 448 } 449 450 size_in_block = block->target_end - start; 451 if (s->begin + s->length < block->target_end) { 452 size_in_block -= block->target_end - (s->begin + s->length); 453 } 454 } else { 455 start = block->target_start; 456 size_in_block = block->target_end - block->target_start; 457 } 458 459 if (phys_addr >= start && phys_addr < start + size_in_block) { 460 *p_offset = phys_addr - start + offset; 461 462 /* The offset range mapped from the vmcore file must not spill over 463 * the GuestPhysBlock, clamp it. The rest of the mapping will be 464 * zero-filled in memory at load time; see 465 * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. 466 */ 467 *p_filesz = phys_addr + mapping_length <= start + size_in_block ? 468 mapping_length : 469 size_in_block - (phys_addr - start); 470 return; 471 } 472 473 offset += size_in_block; 474 } 475 } 476 477 static void write_elf_loads(DumpState *s, Error **errp) 478 { 479 hwaddr offset, filesz; 480 MemoryMapping *memory_mapping; 481 uint32_t phdr_index = 1; 482 uint32_t max_index; 483 Error *local_err = NULL; 484 485 if (s->have_section) { 486 max_index = s->sh_info; 487 } else { 488 max_index = s->phdr_num; 489 } 490 491 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { 492 get_offset_range(memory_mapping->phys_addr, 493 memory_mapping->length, 494 s, &offset, &filesz); 495 if (s->dump_info.d_class == ELFCLASS64) { 496 write_elf64_load(s, memory_mapping, phdr_index++, offset, 497 filesz, &local_err); 498 } else { 499 write_elf32_load(s, memory_mapping, phdr_index++, offset, 500 filesz, &local_err); 501 } 502 503 if (local_err) { 504 error_propagate(errp, local_err); 505 return; 506 } 507 508 if (phdr_index >= max_index) { 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 Error *local_err = NULL; 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 (s->dump_info.d_class == ELFCLASS64) { 545 write_elf64_header(s, &local_err); 546 } else { 547 write_elf32_header(s, &local_err); 548 } 549 if (local_err) { 550 error_propagate(errp, local_err); 551 return; 552 } 553 554 if (s->dump_info.d_class == ELFCLASS64) { 555 /* write PT_NOTE to vmcore */ 556 write_elf64_note(s, &local_err); 557 if (local_err) { 558 error_propagate(errp, local_err); 559 return; 560 } 561 562 /* write all PT_LOAD to vmcore */ 563 write_elf_loads(s, &local_err); 564 if (local_err) { 565 error_propagate(errp, local_err); 566 return; 567 } 568 569 /* write section to vmcore */ 570 if (s->have_section) { 571 write_elf_section(s, 1, &local_err); 572 if (local_err) { 573 error_propagate(errp, local_err); 574 return; 575 } 576 } 577 578 /* write notes to vmcore */ 579 write_elf64_notes(fd_write_vmcore, s, &local_err); 580 if (local_err) { 581 error_propagate(errp, local_err); 582 return; 583 } 584 } else { 585 /* write PT_NOTE to vmcore */ 586 write_elf32_note(s, &local_err); 587 if (local_err) { 588 error_propagate(errp, local_err); 589 return; 590 } 591 592 /* write all PT_LOAD to vmcore */ 593 write_elf_loads(s, &local_err); 594 if (local_err) { 595 error_propagate(errp, local_err); 596 return; 597 } 598 599 /* write section to vmcore */ 600 if (s->have_section) { 601 write_elf_section(s, 0, &local_err); 602 if (local_err) { 603 error_propagate(errp, local_err); 604 return; 605 } 606 } 607 608 /* write notes to vmcore */ 609 write_elf32_notes(fd_write_vmcore, s, &local_err); 610 if (local_err) { 611 error_propagate(errp, local_err); 612 return; 613 } 614 } 615 } 616 617 static int get_next_block(DumpState *s, GuestPhysBlock *block) 618 { 619 while (1) { 620 block = QTAILQ_NEXT(block, next); 621 if (!block) { 622 /* no more block */ 623 return 1; 624 } 625 626 s->start = 0; 627 s->next_block = block; 628 if (s->has_filter) { 629 if (block->target_start >= s->begin + s->length || 630 block->target_end <= s->begin) { 631 /* This block is out of the range */ 632 continue; 633 } 634 635 if (s->begin > block->target_start) { 636 s->start = s->begin - block->target_start; 637 } 638 } 639 640 return 0; 641 } 642 } 643 644 /* write all memory to vmcore */ 645 static void dump_iterate(DumpState *s, Error **errp) 646 { 647 GuestPhysBlock *block; 648 int64_t size; 649 Error *local_err = NULL; 650 651 do { 652 block = s->next_block; 653 654 size = block->target_end - block->target_start; 655 if (s->has_filter) { 656 size -= s->start; 657 if (s->begin + s->length < block->target_end) { 658 size -= block->target_end - (s->begin + s->length); 659 } 660 } 661 write_memory(s, block, s->start, size, &local_err); 662 if (local_err) { 663 error_propagate(errp, local_err); 664 return; 665 } 666 667 } while (!get_next_block(s, block)); 668 } 669 670 static void create_vmcore(DumpState *s, Error **errp) 671 { 672 Error *local_err = NULL; 673 674 dump_begin(s, &local_err); 675 if (local_err) { 676 error_propagate(errp, local_err); 677 return; 678 } 679 680 dump_iterate(s, errp); 681 } 682 683 static int write_start_flat_header(int fd) 684 { 685 MakedumpfileHeader *mh; 686 int ret = 0; 687 688 QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); 689 mh = g_malloc0(MAX_SIZE_MDF_HEADER); 690 691 memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, 692 MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); 693 694 mh->type = cpu_to_be64(TYPE_FLAT_HEADER); 695 mh->version = cpu_to_be64(VERSION_FLAT_HEADER); 696 697 size_t written_size; 698 written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); 699 if (written_size != MAX_SIZE_MDF_HEADER) { 700 ret = -1; 701 } 702 703 g_free(mh); 704 return ret; 705 } 706 707 static int write_end_flat_header(int fd) 708 { 709 MakedumpfileDataHeader mdh; 710 711 mdh.offset = END_FLAG_FLAT_HEADER; 712 mdh.buf_size = END_FLAG_FLAT_HEADER; 713 714 size_t written_size; 715 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 716 if (written_size != sizeof(mdh)) { 717 return -1; 718 } 719 720 return 0; 721 } 722 723 static int write_buffer(int fd, off_t offset, const void *buf, size_t size) 724 { 725 size_t written_size; 726 MakedumpfileDataHeader mdh; 727 728 mdh.offset = cpu_to_be64(offset); 729 mdh.buf_size = cpu_to_be64(size); 730 731 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 732 if (written_size != sizeof(mdh)) { 733 return -1; 734 } 735 736 written_size = qemu_write_full(fd, buf, size); 737 if (written_size != size) { 738 return -1; 739 } 740 741 return 0; 742 } 743 744 static int buf_write_note(const void *buf, size_t size, void *opaque) 745 { 746 DumpState *s = opaque; 747 748 /* note_buf is not enough */ 749 if (s->note_buf_offset + size > s->note_size) { 750 return -1; 751 } 752 753 memcpy(s->note_buf + s->note_buf_offset, buf, size); 754 755 s->note_buf_offset += size; 756 757 return 0; 758 } 759 760 /* 761 * This function retrieves various sizes from an elf header. 762 * 763 * @note has to be a valid ELF note. The return sizes are unmodified 764 * (not padded or rounded up to be multiple of 4). 765 */ 766 static void get_note_sizes(DumpState *s, const void *note, 767 uint64_t *note_head_size, 768 uint64_t *name_size, 769 uint64_t *desc_size) 770 { 771 uint64_t note_head_sz; 772 uint64_t name_sz; 773 uint64_t desc_sz; 774 775 if (s->dump_info.d_class == ELFCLASS64) { 776 const Elf64_Nhdr *hdr = note; 777 note_head_sz = sizeof(Elf64_Nhdr); 778 name_sz = tswap64(hdr->n_namesz); 779 desc_sz = tswap64(hdr->n_descsz); 780 } else { 781 const Elf32_Nhdr *hdr = note; 782 note_head_sz = sizeof(Elf32_Nhdr); 783 name_sz = tswap32(hdr->n_namesz); 784 desc_sz = tswap32(hdr->n_descsz); 785 } 786 787 if (note_head_size) { 788 *note_head_size = note_head_sz; 789 } 790 if (name_size) { 791 *name_size = name_sz; 792 } 793 if (desc_size) { 794 *desc_size = desc_sz; 795 } 796 } 797 798 static bool note_name_equal(DumpState *s, 799 const uint8_t *note, const char *name) 800 { 801 int len = strlen(name) + 1; 802 uint64_t head_size, name_size; 803 804 get_note_sizes(s, note, &head_size, &name_size, NULL); 805 head_size = ROUND_UP(head_size, 4); 806 807 return name_size == len && memcmp(note + head_size, name, len) == 0; 808 } 809 810 /* write common header, sub header and elf note to vmcore */ 811 static void create_header32(DumpState *s, Error **errp) 812 { 813 DiskDumpHeader32 *dh = NULL; 814 KdumpSubHeader32 *kh = NULL; 815 size_t size; 816 uint32_t block_size; 817 uint32_t sub_hdr_size; 818 uint32_t bitmap_blocks; 819 uint32_t status = 0; 820 uint64_t offset_note; 821 Error *local_err = NULL; 822 823 /* write common header, the version of kdump-compressed format is 6th */ 824 size = sizeof(DiskDumpHeader32); 825 dh = g_malloc0(size); 826 827 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 828 dh->header_version = cpu_to_dump32(s, 6); 829 block_size = s->dump_info.page_size; 830 dh->block_size = cpu_to_dump32(s, block_size); 831 sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; 832 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 833 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 834 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 835 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 836 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 837 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 838 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 839 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 840 841 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 842 status |= DUMP_DH_COMPRESSED_ZLIB; 843 } 844 #ifdef CONFIG_LZO 845 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 846 status |= DUMP_DH_COMPRESSED_LZO; 847 } 848 #endif 849 #ifdef CONFIG_SNAPPY 850 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 851 status |= DUMP_DH_COMPRESSED_SNAPPY; 852 } 853 #endif 854 dh->status = cpu_to_dump32(s, status); 855 856 if (write_buffer(s->fd, 0, dh, size) < 0) { 857 error_setg(errp, "dump: failed to write disk dump header"); 858 goto out; 859 } 860 861 /* write sub header */ 862 size = sizeof(KdumpSubHeader32); 863 kh = g_malloc0(size); 864 865 /* 64bit max_mapnr_64 */ 866 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 867 kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); 868 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 869 870 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 871 if (s->guest_note && 872 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 873 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 874 875 get_note_sizes(s, s->guest_note, 876 &hsize, &name_size, &size_vmcoreinfo_desc); 877 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 878 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 879 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 880 kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); 881 } 882 883 kh->offset_note = cpu_to_dump64(s, offset_note); 884 kh->note_size = cpu_to_dump32(s, s->note_size); 885 886 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 887 block_size, kh, size) < 0) { 888 error_setg(errp, "dump: failed to write kdump sub header"); 889 goto out; 890 } 891 892 /* write note */ 893 s->note_buf = g_malloc0(s->note_size); 894 s->note_buf_offset = 0; 895 896 /* use s->note_buf to store notes temporarily */ 897 write_elf32_notes(buf_write_note, s, &local_err); 898 if (local_err) { 899 error_propagate(errp, local_err); 900 goto out; 901 } 902 if (write_buffer(s->fd, offset_note, s->note_buf, 903 s->note_size) < 0) { 904 error_setg(errp, "dump: failed to write notes"); 905 goto out; 906 } 907 908 /* get offset of dump_bitmap */ 909 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 910 block_size; 911 912 /* get offset of page */ 913 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 914 block_size; 915 916 out: 917 g_free(dh); 918 g_free(kh); 919 g_free(s->note_buf); 920 } 921 922 /* write common header, sub header and elf note to vmcore */ 923 static void create_header64(DumpState *s, Error **errp) 924 { 925 DiskDumpHeader64 *dh = NULL; 926 KdumpSubHeader64 *kh = NULL; 927 size_t size; 928 uint32_t block_size; 929 uint32_t sub_hdr_size; 930 uint32_t bitmap_blocks; 931 uint32_t status = 0; 932 uint64_t offset_note; 933 Error *local_err = NULL; 934 935 /* write common header, the version of kdump-compressed format is 6th */ 936 size = sizeof(DiskDumpHeader64); 937 dh = g_malloc0(size); 938 939 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 940 dh->header_version = cpu_to_dump32(s, 6); 941 block_size = s->dump_info.page_size; 942 dh->block_size = cpu_to_dump32(s, block_size); 943 sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; 944 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 945 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 946 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 947 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 948 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 949 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 950 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 951 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 952 953 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 954 status |= DUMP_DH_COMPRESSED_ZLIB; 955 } 956 #ifdef CONFIG_LZO 957 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 958 status |= DUMP_DH_COMPRESSED_LZO; 959 } 960 #endif 961 #ifdef CONFIG_SNAPPY 962 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 963 status |= DUMP_DH_COMPRESSED_SNAPPY; 964 } 965 #endif 966 dh->status = cpu_to_dump32(s, status); 967 968 if (write_buffer(s->fd, 0, dh, size) < 0) { 969 error_setg(errp, "dump: failed to write disk dump header"); 970 goto out; 971 } 972 973 /* write sub header */ 974 size = sizeof(KdumpSubHeader64); 975 kh = g_malloc0(size); 976 977 /* 64bit max_mapnr_64 */ 978 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 979 kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); 980 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 981 982 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 983 if (s->guest_note && 984 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 985 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 986 987 get_note_sizes(s, s->guest_note, 988 &hsize, &name_size, &size_vmcoreinfo_desc); 989 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 990 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 991 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 992 kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); 993 } 994 995 kh->offset_note = cpu_to_dump64(s, offset_note); 996 kh->note_size = cpu_to_dump64(s, s->note_size); 997 998 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 999 block_size, kh, size) < 0) { 1000 error_setg(errp, "dump: failed to write kdump sub header"); 1001 goto out; 1002 } 1003 1004 /* write note */ 1005 s->note_buf = g_malloc0(s->note_size); 1006 s->note_buf_offset = 0; 1007 1008 /* use s->note_buf to store notes temporarily */ 1009 write_elf64_notes(buf_write_note, s, &local_err); 1010 if (local_err) { 1011 error_propagate(errp, local_err); 1012 goto out; 1013 } 1014 1015 if (write_buffer(s->fd, offset_note, s->note_buf, 1016 s->note_size) < 0) { 1017 error_setg(errp, "dump: failed to write notes"); 1018 goto out; 1019 } 1020 1021 /* get offset of dump_bitmap */ 1022 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 1023 block_size; 1024 1025 /* get offset of page */ 1026 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 1027 block_size; 1028 1029 out: 1030 g_free(dh); 1031 g_free(kh); 1032 g_free(s->note_buf); 1033 } 1034 1035 static void write_dump_header(DumpState *s, Error **errp) 1036 { 1037 if (s->dump_info.d_class == ELFCLASS32) { 1038 create_header32(s, errp); 1039 } else { 1040 create_header64(s, errp); 1041 } 1042 } 1043 1044 static size_t dump_bitmap_get_bufsize(DumpState *s) 1045 { 1046 return s->dump_info.page_size; 1047 } 1048 1049 /* 1050 * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be 1051 * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. 1052 * set_dump_bitmap will always leave the recently set bit un-sync. And setting 1053 * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into 1054 * vmcore, ie. synchronizing un-sync bit into vmcore. 1055 */ 1056 static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, 1057 uint8_t *buf, DumpState *s) 1058 { 1059 off_t old_offset, new_offset; 1060 off_t offset_bitmap1, offset_bitmap2; 1061 uint32_t byte, bit; 1062 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1063 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1064 1065 /* should not set the previous place */ 1066 assert(last_pfn <= pfn); 1067 1068 /* 1069 * if the bit needed to be set is not cached in buf, flush the data in buf 1070 * to vmcore firstly. 1071 * making new_offset be bigger than old_offset can also sync remained data 1072 * into vmcore. 1073 */ 1074 old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); 1075 new_offset = bitmap_bufsize * (pfn / bits_per_buf); 1076 1077 while (old_offset < new_offset) { 1078 /* calculate the offset and write dump_bitmap */ 1079 offset_bitmap1 = s->offset_dump_bitmap + old_offset; 1080 if (write_buffer(s->fd, offset_bitmap1, buf, 1081 bitmap_bufsize) < 0) { 1082 return -1; 1083 } 1084 1085 /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ 1086 offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + 1087 old_offset; 1088 if (write_buffer(s->fd, offset_bitmap2, buf, 1089 bitmap_bufsize) < 0) { 1090 return -1; 1091 } 1092 1093 memset(buf, 0, bitmap_bufsize); 1094 old_offset += bitmap_bufsize; 1095 } 1096 1097 /* get the exact place of the bit in the buf, and set it */ 1098 byte = (pfn % bits_per_buf) / CHAR_BIT; 1099 bit = (pfn % bits_per_buf) % CHAR_BIT; 1100 if (value) { 1101 buf[byte] |= 1u << bit; 1102 } else { 1103 buf[byte] &= ~(1u << bit); 1104 } 1105 1106 return 0; 1107 } 1108 1109 static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) 1110 { 1111 int target_page_shift = ctz32(s->dump_info.page_size); 1112 1113 return (addr >> target_page_shift) - ARCH_PFN_OFFSET; 1114 } 1115 1116 static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) 1117 { 1118 int target_page_shift = ctz32(s->dump_info.page_size); 1119 1120 return (pfn + ARCH_PFN_OFFSET) << target_page_shift; 1121 } 1122 1123 /* 1124 * exam every page and return the page frame number and the address of the page. 1125 * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys 1126 * blocks, so block->target_start and block->target_end should be interal 1127 * multiples of the target page size. 1128 */ 1129 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, 1130 uint8_t **bufptr, DumpState *s) 1131 { 1132 GuestPhysBlock *block = *blockptr; 1133 hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); 1134 uint8_t *buf; 1135 1136 /* block == NULL means the start of the iteration */ 1137 if (!block) { 1138 block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1139 *blockptr = block; 1140 assert((block->target_start & ~target_page_mask) == 0); 1141 assert((block->target_end & ~target_page_mask) == 0); 1142 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1143 if (bufptr) { 1144 *bufptr = block->host_addr; 1145 } 1146 return true; 1147 } 1148 1149 *pfnptr = *pfnptr + 1; 1150 addr = dump_pfn_to_paddr(s, *pfnptr); 1151 1152 if ((addr >= block->target_start) && 1153 (addr + s->dump_info.page_size <= block->target_end)) { 1154 buf = block->host_addr + (addr - block->target_start); 1155 } else { 1156 /* the next page is in the next block */ 1157 block = QTAILQ_NEXT(block, next); 1158 *blockptr = block; 1159 if (!block) { 1160 return false; 1161 } 1162 assert((block->target_start & ~target_page_mask) == 0); 1163 assert((block->target_end & ~target_page_mask) == 0); 1164 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1165 buf = block->host_addr; 1166 } 1167 1168 if (bufptr) { 1169 *bufptr = buf; 1170 } 1171 1172 return true; 1173 } 1174 1175 static void write_dump_bitmap(DumpState *s, Error **errp) 1176 { 1177 int ret = 0; 1178 uint64_t last_pfn, pfn; 1179 void *dump_bitmap_buf; 1180 size_t num_dumpable; 1181 GuestPhysBlock *block_iter = NULL; 1182 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1183 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1184 1185 /* dump_bitmap_buf is used to store dump_bitmap temporarily */ 1186 dump_bitmap_buf = g_malloc0(bitmap_bufsize); 1187 1188 num_dumpable = 0; 1189 last_pfn = 0; 1190 1191 /* 1192 * exam memory page by page, and set the bit in dump_bitmap corresponded 1193 * to the existing page. 1194 */ 1195 while (get_next_page(&block_iter, &pfn, NULL, s)) { 1196 ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); 1197 if (ret < 0) { 1198 error_setg(errp, "dump: failed to set dump_bitmap"); 1199 goto out; 1200 } 1201 1202 last_pfn = pfn; 1203 num_dumpable++; 1204 } 1205 1206 /* 1207 * set_dump_bitmap will always leave the recently set bit un-sync. Here we 1208 * set the remaining bits from last_pfn to the end of the bitmap buffer to 1209 * 0. With those set, the un-sync bit will be synchronized into the vmcore. 1210 */ 1211 if (num_dumpable > 0) { 1212 ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, 1213 dump_bitmap_buf, s); 1214 if (ret < 0) { 1215 error_setg(errp, "dump: failed to sync dump_bitmap"); 1216 goto out; 1217 } 1218 } 1219 1220 /* number of dumpable pages that will be dumped later */ 1221 s->num_dumpable = num_dumpable; 1222 1223 out: 1224 g_free(dump_bitmap_buf); 1225 } 1226 1227 static void prepare_data_cache(DataCache *data_cache, DumpState *s, 1228 off_t offset) 1229 { 1230 data_cache->fd = s->fd; 1231 data_cache->data_size = 0; 1232 data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); 1233 data_cache->buf = g_malloc0(data_cache->buf_size); 1234 data_cache->offset = offset; 1235 } 1236 1237 static int write_cache(DataCache *dc, const void *buf, size_t size, 1238 bool flag_sync) 1239 { 1240 /* 1241 * dc->buf_size should not be less than size, otherwise dc will never be 1242 * enough 1243 */ 1244 assert(size <= dc->buf_size); 1245 1246 /* 1247 * if flag_sync is set, synchronize data in dc->buf into vmcore. 1248 * otherwise check if the space is enough for caching data in buf, if not, 1249 * write the data in dc->buf to dc->fd and reset dc->buf 1250 */ 1251 if ((!flag_sync && dc->data_size + size > dc->buf_size) || 1252 (flag_sync && dc->data_size > 0)) { 1253 if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { 1254 return -1; 1255 } 1256 1257 dc->offset += dc->data_size; 1258 dc->data_size = 0; 1259 } 1260 1261 if (!flag_sync) { 1262 memcpy(dc->buf + dc->data_size, buf, size); 1263 dc->data_size += size; 1264 } 1265 1266 return 0; 1267 } 1268 1269 static void free_data_cache(DataCache *data_cache) 1270 { 1271 g_free(data_cache->buf); 1272 } 1273 1274 static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) 1275 { 1276 switch (flag_compress) { 1277 case DUMP_DH_COMPRESSED_ZLIB: 1278 return compressBound(page_size); 1279 1280 case DUMP_DH_COMPRESSED_LZO: 1281 /* 1282 * LZO will expand incompressible data by a little amount. Please check 1283 * the following URL to see the expansion calculation: 1284 * http://www.oberhumer.com/opensource/lzo/lzofaq.php 1285 */ 1286 return page_size + page_size / 16 + 64 + 3; 1287 1288 #ifdef CONFIG_SNAPPY 1289 case DUMP_DH_COMPRESSED_SNAPPY: 1290 return snappy_max_compressed_length(page_size); 1291 #endif 1292 } 1293 return 0; 1294 } 1295 1296 static void write_dump_pages(DumpState *s, Error **errp) 1297 { 1298 int ret = 0; 1299 DataCache page_desc, page_data; 1300 size_t len_buf_out, size_out; 1301 #ifdef CONFIG_LZO 1302 lzo_bytep wrkmem = NULL; 1303 #endif 1304 uint8_t *buf_out = NULL; 1305 off_t offset_desc, offset_data; 1306 PageDescriptor pd, pd_zero; 1307 uint8_t *buf; 1308 GuestPhysBlock *block_iter = NULL; 1309 uint64_t pfn_iter; 1310 1311 /* get offset of page_desc and page_data in dump file */ 1312 offset_desc = s->offset_page; 1313 offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; 1314 1315 prepare_data_cache(&page_desc, s, offset_desc); 1316 prepare_data_cache(&page_data, s, offset_data); 1317 1318 /* prepare buffer to store compressed data */ 1319 len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); 1320 assert(len_buf_out != 0); 1321 1322 #ifdef CONFIG_LZO 1323 wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); 1324 #endif 1325 1326 buf_out = g_malloc(len_buf_out); 1327 1328 /* 1329 * init zero page's page_desc and page_data, because every zero page 1330 * uses the same page_data 1331 */ 1332 pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); 1333 pd_zero.flags = cpu_to_dump32(s, 0); 1334 pd_zero.offset = cpu_to_dump64(s, offset_data); 1335 pd_zero.page_flags = cpu_to_dump64(s, 0); 1336 buf = g_malloc0(s->dump_info.page_size); 1337 ret = write_cache(&page_data, buf, s->dump_info.page_size, false); 1338 g_free(buf); 1339 if (ret < 0) { 1340 error_setg(errp, "dump: failed to write page data (zero page)"); 1341 goto out; 1342 } 1343 1344 offset_data += s->dump_info.page_size; 1345 1346 /* 1347 * dump memory to vmcore page by page. zero page will all be resided in the 1348 * first page of page section 1349 */ 1350 while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { 1351 /* check zero page */ 1352 if (buffer_is_zero(buf, s->dump_info.page_size)) { 1353 ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), 1354 false); 1355 if (ret < 0) { 1356 error_setg(errp, "dump: failed to write page desc"); 1357 goto out; 1358 } 1359 } else { 1360 /* 1361 * not zero page, then: 1362 * 1. compress the page 1363 * 2. write the compressed page into the cache of page_data 1364 * 3. get page desc of the compressed page and write it into the 1365 * cache of page_desc 1366 * 1367 * only one compression format will be used here, for 1368 * s->flag_compress is set. But when compression fails to work, 1369 * we fall back to save in plaintext. 1370 */ 1371 size_out = len_buf_out; 1372 if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && 1373 (compress2(buf_out, (uLongf *)&size_out, buf, 1374 s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && 1375 (size_out < s->dump_info.page_size)) { 1376 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); 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 #ifdef CONFIG_LZO 1385 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && 1386 (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, 1387 (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && 1388 (size_out < s->dump_info.page_size)) { 1389 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); 1390 pd.size = cpu_to_dump32(s, size_out); 1391 1392 ret = write_cache(&page_data, buf_out, size_out, false); 1393 if (ret < 0) { 1394 error_setg(errp, "dump: failed to write page data"); 1395 goto out; 1396 } 1397 #endif 1398 #ifdef CONFIG_SNAPPY 1399 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && 1400 (snappy_compress((char *)buf, s->dump_info.page_size, 1401 (char *)buf_out, &size_out) == SNAPPY_OK) && 1402 (size_out < s->dump_info.page_size)) { 1403 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); 1404 pd.size = cpu_to_dump32(s, size_out); 1405 1406 ret = write_cache(&page_data, buf_out, size_out, false); 1407 if (ret < 0) { 1408 error_setg(errp, "dump: failed to write page data"); 1409 goto out; 1410 } 1411 #endif 1412 } else { 1413 /* 1414 * fall back to save in plaintext, size_out should be 1415 * assigned the target's page size 1416 */ 1417 pd.flags = cpu_to_dump32(s, 0); 1418 size_out = s->dump_info.page_size; 1419 pd.size = cpu_to_dump32(s, size_out); 1420 1421 ret = write_cache(&page_data, buf, 1422 s->dump_info.page_size, false); 1423 if (ret < 0) { 1424 error_setg(errp, "dump: failed to write page data"); 1425 goto out; 1426 } 1427 } 1428 1429 /* get and write page desc here */ 1430 pd.page_flags = cpu_to_dump64(s, 0); 1431 pd.offset = cpu_to_dump64(s, offset_data); 1432 offset_data += size_out; 1433 1434 ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); 1435 if (ret < 0) { 1436 error_setg(errp, "dump: failed to write page desc"); 1437 goto out; 1438 } 1439 } 1440 s->written_size += s->dump_info.page_size; 1441 } 1442 1443 ret = write_cache(&page_desc, NULL, 0, true); 1444 if (ret < 0) { 1445 error_setg(errp, "dump: failed to sync cache for page_desc"); 1446 goto out; 1447 } 1448 ret = write_cache(&page_data, NULL, 0, true); 1449 if (ret < 0) { 1450 error_setg(errp, "dump: failed to sync cache for page_data"); 1451 goto out; 1452 } 1453 1454 out: 1455 free_data_cache(&page_desc); 1456 free_data_cache(&page_data); 1457 1458 #ifdef CONFIG_LZO 1459 g_free(wrkmem); 1460 #endif 1461 1462 g_free(buf_out); 1463 } 1464 1465 static void create_kdump_vmcore(DumpState *s, Error **errp) 1466 { 1467 int ret; 1468 Error *local_err = NULL; 1469 1470 /* 1471 * the kdump-compressed format is: 1472 * File offset 1473 * +------------------------------------------+ 0x0 1474 * | main header (struct disk_dump_header) | 1475 * |------------------------------------------+ block 1 1476 * | sub header (struct kdump_sub_header) | 1477 * |------------------------------------------+ block 2 1478 * | 1st-dump_bitmap | 1479 * |------------------------------------------+ block 2 + X blocks 1480 * | 2nd-dump_bitmap | (aligned by block) 1481 * |------------------------------------------+ block 2 + 2 * X blocks 1482 * | page desc for pfn 0 (struct page_desc) | (aligned by block) 1483 * | page desc for pfn 1 (struct page_desc) | 1484 * | : | 1485 * |------------------------------------------| (not aligned by block) 1486 * | page data (pfn 0) | 1487 * | page data (pfn 1) | 1488 * | : | 1489 * +------------------------------------------+ 1490 */ 1491 1492 ret = write_start_flat_header(s->fd); 1493 if (ret < 0) { 1494 error_setg(errp, "dump: failed to write start flat header"); 1495 return; 1496 } 1497 1498 write_dump_header(s, &local_err); 1499 if (local_err) { 1500 error_propagate(errp, local_err); 1501 return; 1502 } 1503 1504 write_dump_bitmap(s, &local_err); 1505 if (local_err) { 1506 error_propagate(errp, local_err); 1507 return; 1508 } 1509 1510 write_dump_pages(s, &local_err); 1511 if (local_err) { 1512 error_propagate(errp, local_err); 1513 return; 1514 } 1515 1516 ret = write_end_flat_header(s->fd); 1517 if (ret < 0) { 1518 error_setg(errp, "dump: failed to write end flat header"); 1519 return; 1520 } 1521 } 1522 1523 static ram_addr_t get_start_block(DumpState *s) 1524 { 1525 GuestPhysBlock *block; 1526 1527 if (!s->has_filter) { 1528 s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1529 return 0; 1530 } 1531 1532 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1533 if (block->target_start >= s->begin + s->length || 1534 block->target_end <= s->begin) { 1535 /* This block is out of the range */ 1536 continue; 1537 } 1538 1539 s->next_block = block; 1540 if (s->begin > block->target_start) { 1541 s->start = s->begin - block->target_start; 1542 } else { 1543 s->start = 0; 1544 } 1545 return s->start; 1546 } 1547 1548 return -1; 1549 } 1550 1551 static void get_max_mapnr(DumpState *s) 1552 { 1553 GuestPhysBlock *last_block; 1554 1555 last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); 1556 s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); 1557 } 1558 1559 static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; 1560 1561 static void dump_state_prepare(DumpState *s) 1562 { 1563 /* zero the struct, setting status to active */ 1564 *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; 1565 } 1566 1567 bool dump_in_progress(void) 1568 { 1569 DumpState *state = &dump_state_global; 1570 return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE); 1571 } 1572 1573 /* calculate total size of memory to be dumped (taking filter into 1574 * acoount.) */ 1575 static int64_t dump_calculate_size(DumpState *s) 1576 { 1577 GuestPhysBlock *block; 1578 int64_t size = 0, total = 0, left = 0, right = 0; 1579 1580 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1581 if (s->has_filter) { 1582 /* calculate the overlapped region. */ 1583 left = MAX(s->begin, block->target_start); 1584 right = MIN(s->begin + s->length, block->target_end); 1585 size = right - left; 1586 size = size > 0 ? size : 0; 1587 } else { 1588 /* count the whole region in */ 1589 size = (block->target_end - block->target_start); 1590 } 1591 total += size; 1592 } 1593 1594 return total; 1595 } 1596 1597 static void vmcoreinfo_update_phys_base(DumpState *s) 1598 { 1599 uint64_t size, note_head_size, name_size, phys_base; 1600 char **lines; 1601 uint8_t *vmci; 1602 size_t i; 1603 1604 if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { 1605 return; 1606 } 1607 1608 get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); 1609 note_head_size = ROUND_UP(note_head_size, 4); 1610 1611 vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); 1612 *(vmci + size) = '\0'; 1613 1614 lines = g_strsplit((char *)vmci, "\n", -1); 1615 for (i = 0; lines[i]; i++) { 1616 const char *prefix = NULL; 1617 1618 if (s->dump_info.d_machine == EM_X86_64) { 1619 prefix = "NUMBER(phys_base)="; 1620 } else if (s->dump_info.d_machine == EM_AARCH64) { 1621 prefix = "NUMBER(PHYS_OFFSET)="; 1622 } 1623 1624 if (prefix && g_str_has_prefix(lines[i], prefix)) { 1625 if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, 1626 &phys_base) < 0) { 1627 warn_report("Failed to read %s", prefix); 1628 } else { 1629 s->dump_info.phys_base = phys_base; 1630 } 1631 break; 1632 } 1633 } 1634 1635 g_strfreev(lines); 1636 } 1637 1638 static void dump_init(DumpState *s, int fd, bool has_format, 1639 DumpGuestMemoryFormat format, bool paging, bool has_filter, 1640 int64_t begin, int64_t length, Error **errp) 1641 { 1642 VMCoreInfoState *vmci = vmcoreinfo_find(); 1643 CPUState *cpu; 1644 int nr_cpus; 1645 Error *err = NULL; 1646 int ret; 1647 1648 s->has_format = has_format; 1649 s->format = format; 1650 s->written_size = 0; 1651 1652 /* kdump-compressed is conflict with paging and filter */ 1653 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1654 assert(!paging && !has_filter); 1655 } 1656 1657 if (runstate_is_running()) { 1658 vm_stop(RUN_STATE_SAVE_VM); 1659 s->resume = true; 1660 } else { 1661 s->resume = false; 1662 } 1663 1664 /* If we use KVM, we should synchronize the registers before we get dump 1665 * info or physmap info. 1666 */ 1667 cpu_synchronize_all_states(); 1668 nr_cpus = 0; 1669 CPU_FOREACH(cpu) { 1670 nr_cpus++; 1671 } 1672 1673 s->fd = fd; 1674 s->has_filter = has_filter; 1675 s->begin = begin; 1676 s->length = length; 1677 1678 memory_mapping_list_init(&s->list); 1679 1680 guest_phys_blocks_init(&s->guest_phys_blocks); 1681 guest_phys_blocks_append(&s->guest_phys_blocks); 1682 s->total_size = dump_calculate_size(s); 1683 #ifdef DEBUG_DUMP_GUEST_MEMORY 1684 fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); 1685 #endif 1686 1687 /* it does not make sense to dump non-existent memory */ 1688 if (!s->total_size) { 1689 error_setg(errp, "dump: no guest memory to dump"); 1690 goto cleanup; 1691 } 1692 1693 s->start = get_start_block(s); 1694 if (s->start == -1) { 1695 error_setg(errp, QERR_INVALID_PARAMETER, "begin"); 1696 goto cleanup; 1697 } 1698 1699 /* get dump info: endian, class and architecture. 1700 * If the target architecture is not supported, cpu_get_dump_info() will 1701 * return -1. 1702 */ 1703 ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); 1704 if (ret < 0) { 1705 error_setg(errp, QERR_UNSUPPORTED); 1706 goto cleanup; 1707 } 1708 1709 if (!s->dump_info.page_size) { 1710 s->dump_info.page_size = TARGET_PAGE_SIZE; 1711 } 1712 1713 s->note_size = cpu_get_note_size(s->dump_info.d_class, 1714 s->dump_info.d_machine, nr_cpus); 1715 if (s->note_size < 0) { 1716 error_setg(errp, QERR_UNSUPPORTED); 1717 goto cleanup; 1718 } 1719 1720 /* 1721 * The goal of this block is to (a) update the previously guessed 1722 * phys_base, (b) copy the guest note out of the guest. 1723 * Failure to do so is not fatal for dumping. 1724 */ 1725 if (vmci) { 1726 uint64_t addr, note_head_size, name_size, desc_size; 1727 uint32_t size; 1728 uint16_t format; 1729 1730 note_head_size = s->dump_info.d_class == ELFCLASS32 ? 1731 sizeof(Elf32_Nhdr) : sizeof(Elf64_Nhdr); 1732 1733 format = le16_to_cpu(vmci->vmcoreinfo.guest_format); 1734 size = le32_to_cpu(vmci->vmcoreinfo.size); 1735 addr = le64_to_cpu(vmci->vmcoreinfo.paddr); 1736 if (!vmci->has_vmcoreinfo) { 1737 warn_report("guest note is not present"); 1738 } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { 1739 warn_report("guest note size is invalid: %" PRIu32, size); 1740 } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { 1741 warn_report("guest note format is unsupported: %" PRIu16, format); 1742 } else { 1743 s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ 1744 cpu_physical_memory_read(addr, s->guest_note, size); 1745 1746 get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); 1747 s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, 1748 desc_size); 1749 if (name_size > MAX_GUEST_NOTE_SIZE || 1750 desc_size > MAX_GUEST_NOTE_SIZE || 1751 s->guest_note_size > size) { 1752 warn_report("Invalid guest note header"); 1753 g_free(s->guest_note); 1754 s->guest_note = NULL; 1755 } else { 1756 vmcoreinfo_update_phys_base(s); 1757 s->note_size += s->guest_note_size; 1758 } 1759 } 1760 } 1761 1762 /* get memory mapping */ 1763 if (paging) { 1764 qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err); 1765 if (err != NULL) { 1766 error_propagate(errp, err); 1767 goto cleanup; 1768 } 1769 } else { 1770 qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); 1771 } 1772 1773 s->nr_cpus = nr_cpus; 1774 1775 get_max_mapnr(s); 1776 1777 uint64_t tmp; 1778 tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), 1779 s->dump_info.page_size); 1780 s->len_dump_bitmap = tmp * s->dump_info.page_size; 1781 1782 /* init for kdump-compressed format */ 1783 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1784 switch (format) { 1785 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: 1786 s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; 1787 break; 1788 1789 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: 1790 #ifdef CONFIG_LZO 1791 if (lzo_init() != LZO_E_OK) { 1792 error_setg(errp, "failed to initialize the LZO library"); 1793 goto cleanup; 1794 } 1795 #endif 1796 s->flag_compress = DUMP_DH_COMPRESSED_LZO; 1797 break; 1798 1799 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: 1800 s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; 1801 break; 1802 1803 default: 1804 s->flag_compress = 0; 1805 } 1806 1807 return; 1808 } 1809 1810 if (s->has_filter) { 1811 memory_mapping_filter(&s->list, s->begin, s->length); 1812 } 1813 1814 /* 1815 * calculate phdr_num 1816 * 1817 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow 1818 */ 1819 s->phdr_num = 1; /* PT_NOTE */ 1820 if (s->list.num < UINT16_MAX - 2) { 1821 s->phdr_num += s->list.num; 1822 s->have_section = false; 1823 } else { 1824 s->have_section = true; 1825 s->phdr_num = PN_XNUM; 1826 s->sh_info = 1; /* PT_NOTE */ 1827 1828 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ 1829 if (s->list.num <= UINT32_MAX - 1) { 1830 s->sh_info += s->list.num; 1831 } else { 1832 s->sh_info = UINT32_MAX; 1833 } 1834 } 1835 1836 if (s->dump_info.d_class == ELFCLASS64) { 1837 if (s->have_section) { 1838 s->memory_offset = sizeof(Elf64_Ehdr) + 1839 sizeof(Elf64_Phdr) * s->sh_info + 1840 sizeof(Elf64_Shdr) + s->note_size; 1841 } else { 1842 s->memory_offset = sizeof(Elf64_Ehdr) + 1843 sizeof(Elf64_Phdr) * s->phdr_num + s->note_size; 1844 } 1845 } else { 1846 if (s->have_section) { 1847 s->memory_offset = sizeof(Elf32_Ehdr) + 1848 sizeof(Elf32_Phdr) * s->sh_info + 1849 sizeof(Elf32_Shdr) + s->note_size; 1850 } else { 1851 s->memory_offset = sizeof(Elf32_Ehdr) + 1852 sizeof(Elf32_Phdr) * s->phdr_num + s->note_size; 1853 } 1854 } 1855 1856 return; 1857 1858 cleanup: 1859 dump_cleanup(s); 1860 } 1861 1862 /* this operation might be time consuming. */ 1863 static void dump_process(DumpState *s, Error **errp) 1864 { 1865 Error *local_err = NULL; 1866 DumpQueryResult *result = NULL; 1867 1868 if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1869 #ifdef TARGET_X86_64 1870 create_win_dump(s, &local_err); 1871 #endif 1872 } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1873 create_kdump_vmcore(s, &local_err); 1874 } else { 1875 create_vmcore(s, &local_err); 1876 } 1877 1878 /* make sure status is written after written_size updates */ 1879 smp_wmb(); 1880 qatomic_set(&s->status, 1881 (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); 1882 1883 /* send DUMP_COMPLETED message (unconditionally) */ 1884 result = qmp_query_dump(NULL); 1885 /* should never fail */ 1886 assert(result); 1887 qapi_event_send_dump_completed(result, !!local_err, (local_err ? 1888 error_get_pretty(local_err) : NULL)); 1889 qapi_free_DumpQueryResult(result); 1890 1891 error_propagate(errp, local_err); 1892 dump_cleanup(s); 1893 } 1894 1895 static void *dump_thread(void *data) 1896 { 1897 DumpState *s = (DumpState *)data; 1898 dump_process(s, NULL); 1899 return NULL; 1900 } 1901 1902 DumpQueryResult *qmp_query_dump(Error **errp) 1903 { 1904 DumpQueryResult *result = g_new(DumpQueryResult, 1); 1905 DumpState *state = &dump_state_global; 1906 result->status = qatomic_read(&state->status); 1907 /* make sure we are reading status and written_size in order */ 1908 smp_rmb(); 1909 result->completed = state->written_size; 1910 result->total = state->total_size; 1911 return result; 1912 } 1913 1914 void qmp_dump_guest_memory(bool paging, const char *file, 1915 bool has_detach, bool detach, 1916 bool has_begin, int64_t begin, bool has_length, 1917 int64_t length, bool has_format, 1918 DumpGuestMemoryFormat format, Error **errp) 1919 { 1920 const char *p; 1921 int fd = -1; 1922 DumpState *s; 1923 Error *local_err = NULL; 1924 bool detach_p = false; 1925 1926 if (runstate_check(RUN_STATE_INMIGRATE)) { 1927 error_setg(errp, "Dump not allowed during incoming migration."); 1928 return; 1929 } 1930 1931 /* if there is a dump in background, we should wait until the dump 1932 * finished */ 1933 if (dump_in_progress()) { 1934 error_setg(errp, "There is a dump in process, please wait."); 1935 return; 1936 } 1937 1938 /* 1939 * kdump-compressed format need the whole memory dumped, so paging or 1940 * filter is not supported here. 1941 */ 1942 if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && 1943 (paging || has_begin || has_length)) { 1944 error_setg(errp, "kdump-compressed format doesn't support paging or " 1945 "filter"); 1946 return; 1947 } 1948 if (has_begin && !has_length) { 1949 error_setg(errp, QERR_MISSING_PARAMETER, "length"); 1950 return; 1951 } 1952 if (!has_begin && has_length) { 1953 error_setg(errp, QERR_MISSING_PARAMETER, "begin"); 1954 return; 1955 } 1956 if (has_detach) { 1957 detach_p = detach; 1958 } 1959 1960 /* check whether lzo/snappy is supported */ 1961 #ifndef CONFIG_LZO 1962 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { 1963 error_setg(errp, "kdump-lzo is not available now"); 1964 return; 1965 } 1966 #endif 1967 1968 #ifndef CONFIG_SNAPPY 1969 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { 1970 error_setg(errp, "kdump-snappy is not available now"); 1971 return; 1972 } 1973 #endif 1974 1975 #ifndef TARGET_X86_64 1976 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1977 error_setg(errp, "Windows dump is only available for x86-64"); 1978 return; 1979 } 1980 #endif 1981 1982 #if !defined(WIN32) 1983 if (strstart(file, "fd:", &p)) { 1984 fd = monitor_get_fd(monitor_cur(), p, errp); 1985 if (fd == -1) { 1986 return; 1987 } 1988 } 1989 #endif 1990 1991 if (strstart(file, "file:", &p)) { 1992 fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); 1993 if (fd < 0) { 1994 error_setg_file_open(errp, errno, p); 1995 return; 1996 } 1997 } 1998 1999 if (fd == -1) { 2000 error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); 2001 return; 2002 } 2003 2004 if (!dump_migration_blocker) { 2005 error_setg(&dump_migration_blocker, 2006 "Live migration disabled: dump-guest-memory in progress"); 2007 } 2008 2009 /* 2010 * Allows even for -only-migratable, but forbid migration during the 2011 * process of dump guest memory. 2012 */ 2013 if (migrate_add_blocker_internal(dump_migration_blocker, errp)) { 2014 /* Remember to release the fd before passing it over to dump state */ 2015 close(fd); 2016 return; 2017 } 2018 2019 s = &dump_state_global; 2020 dump_state_prepare(s); 2021 2022 dump_init(s, fd, has_format, format, paging, has_begin, 2023 begin, length, &local_err); 2024 if (local_err) { 2025 error_propagate(errp, local_err); 2026 qatomic_set(&s->status, DUMP_STATUS_FAILED); 2027 return; 2028 } 2029 2030 if (detach_p) { 2031 /* detached dump */ 2032 s->detached = true; 2033 qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, 2034 s, QEMU_THREAD_DETACHED); 2035 } else { 2036 /* sync dump */ 2037 dump_process(s, errp); 2038 } 2039 } 2040 2041 DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) 2042 { 2043 DumpGuestMemoryCapability *cap = 2044 g_new0(DumpGuestMemoryCapability, 1); 2045 DumpGuestMemoryFormatList **tail = &cap->formats; 2046 2047 /* elf is always available */ 2048 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_ELF); 2049 2050 /* kdump-zlib is always available */ 2051 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB); 2052 2053 /* add new item if kdump-lzo is available */ 2054 #ifdef CONFIG_LZO 2055 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO); 2056 #endif 2057 2058 /* add new item if kdump-snappy is available */ 2059 #ifdef CONFIG_SNAPPY 2060 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY); 2061 #endif 2062 2063 /* Windows dump is available only if target is x86_64 */ 2064 #ifdef TARGET_X86_64 2065 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_WIN_DMP); 2066 #endif 2067 2068 return cap; 2069 } 2070