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 "cpu.h" 19 #include "exec/hwaddr.h" 20 #include "monitor/monitor.h" 21 #include "sysemu/kvm.h" 22 #include "sysemu/dump.h" 23 #include "sysemu/memory_mapping.h" 24 #include "sysemu/runstate.h" 25 #include "sysemu/cpus.h" 26 #include "qapi/error.h" 27 #include "qapi/qapi-commands-dump.h" 28 #include "qapi/qapi-events-dump.h" 29 #include "qapi/qmp/qerror.h" 30 #include "qemu/error-report.h" 31 #include "qemu/main-loop.h" 32 #include "hw/misc/vmcoreinfo.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 #define ELF_NOTE_SIZE(hdr_size, name_size, desc_size) \ 52 ((DIV_ROUND_UP((hdr_size), 4) + \ 53 DIV_ROUND_UP((name_size), 4) + \ 54 DIV_ROUND_UP((desc_size), 4)) * 4) 55 56 uint16_t cpu_to_dump16(DumpState *s, uint16_t val) 57 { 58 if (s->dump_info.d_endian == ELFDATA2LSB) { 59 val = cpu_to_le16(val); 60 } else { 61 val = cpu_to_be16(val); 62 } 63 64 return val; 65 } 66 67 uint32_t cpu_to_dump32(DumpState *s, uint32_t val) 68 { 69 if (s->dump_info.d_endian == ELFDATA2LSB) { 70 val = cpu_to_le32(val); 71 } else { 72 val = cpu_to_be32(val); 73 } 74 75 return val; 76 } 77 78 uint64_t cpu_to_dump64(DumpState *s, uint64_t val) 79 { 80 if (s->dump_info.d_endian == ELFDATA2LSB) { 81 val = cpu_to_le64(val); 82 } else { 83 val = cpu_to_be64(val); 84 } 85 86 return val; 87 } 88 89 static int dump_cleanup(DumpState *s) 90 { 91 guest_phys_blocks_free(&s->guest_phys_blocks); 92 memory_mapping_list_free(&s->list); 93 close(s->fd); 94 g_free(s->guest_note); 95 s->guest_note = NULL; 96 if (s->resume) { 97 if (s->detached) { 98 qemu_mutex_lock_iothread(); 99 } 100 vm_start(); 101 if (s->detached) { 102 qemu_mutex_unlock_iothread(); 103 } 104 } 105 106 return 0; 107 } 108 109 static int fd_write_vmcore(const void *buf, size_t size, void *opaque) 110 { 111 DumpState *s = opaque; 112 size_t written_size; 113 114 written_size = qemu_write_full(s->fd, buf, size); 115 if (written_size != size) { 116 return -errno; 117 } 118 119 return 0; 120 } 121 122 static void write_elf64_header(DumpState *s, Error **errp) 123 { 124 Elf64_Ehdr elf_header; 125 int ret; 126 127 memset(&elf_header, 0, sizeof(Elf64_Ehdr)); 128 memcpy(&elf_header, ELFMAG, SELFMAG); 129 elf_header.e_ident[EI_CLASS] = ELFCLASS64; 130 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 131 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 132 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 133 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 134 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 135 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 136 elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); 137 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); 138 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); 139 if (s->have_section) { 140 uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; 141 142 elf_header.e_shoff = cpu_to_dump64(s, shoff); 143 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); 144 elf_header.e_shnum = cpu_to_dump16(s, 1); 145 } 146 147 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 148 if (ret < 0) { 149 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 150 } 151 } 152 153 static void write_elf32_header(DumpState *s, Error **errp) 154 { 155 Elf32_Ehdr elf_header; 156 int ret; 157 158 memset(&elf_header, 0, sizeof(Elf32_Ehdr)); 159 memcpy(&elf_header, ELFMAG, SELFMAG); 160 elf_header.e_ident[EI_CLASS] = ELFCLASS32; 161 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; 162 elf_header.e_ident[EI_VERSION] = EV_CURRENT; 163 elf_header.e_type = cpu_to_dump16(s, ET_CORE); 164 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); 165 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); 166 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); 167 elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); 168 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); 169 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); 170 if (s->have_section) { 171 uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; 172 173 elf_header.e_shoff = cpu_to_dump32(s, shoff); 174 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); 175 elf_header.e_shnum = cpu_to_dump16(s, 1); 176 } 177 178 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); 179 if (ret < 0) { 180 error_setg_errno(errp, -ret, "dump: failed to write elf header"); 181 } 182 } 183 184 static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, 185 int phdr_index, hwaddr offset, 186 hwaddr filesz, Error **errp) 187 { 188 Elf64_Phdr phdr; 189 int ret; 190 191 memset(&phdr, 0, sizeof(Elf64_Phdr)); 192 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 193 phdr.p_offset = cpu_to_dump64(s, offset); 194 phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); 195 phdr.p_filesz = cpu_to_dump64(s, filesz); 196 phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); 197 phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 198 199 assert(memory_mapping->length >= filesz); 200 201 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 202 if (ret < 0) { 203 error_setg_errno(errp, -ret, 204 "dump: failed to write program header table"); 205 } 206 } 207 208 static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, 209 int phdr_index, hwaddr offset, 210 hwaddr filesz, Error **errp) 211 { 212 Elf32_Phdr phdr; 213 int ret; 214 215 memset(&phdr, 0, sizeof(Elf32_Phdr)); 216 phdr.p_type = cpu_to_dump32(s, PT_LOAD); 217 phdr.p_offset = cpu_to_dump32(s, offset); 218 phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); 219 phdr.p_filesz = cpu_to_dump32(s, filesz); 220 phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); 221 phdr.p_vaddr = 222 cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; 223 224 assert(memory_mapping->length >= filesz); 225 226 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 227 if (ret < 0) { 228 error_setg_errno(errp, -ret, 229 "dump: failed to write program header table"); 230 } 231 } 232 233 static void write_elf64_note(DumpState *s, Error **errp) 234 { 235 Elf64_Phdr phdr; 236 hwaddr begin = s->memory_offset - s->note_size; 237 int ret; 238 239 memset(&phdr, 0, sizeof(Elf64_Phdr)); 240 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 241 phdr.p_offset = cpu_to_dump64(s, begin); 242 phdr.p_paddr = 0; 243 phdr.p_filesz = cpu_to_dump64(s, s->note_size); 244 phdr.p_memsz = cpu_to_dump64(s, s->note_size); 245 phdr.p_vaddr = 0; 246 247 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); 248 if (ret < 0) { 249 error_setg_errno(errp, -ret, 250 "dump: failed to write program header table"); 251 } 252 } 253 254 static inline int cpu_index(CPUState *cpu) 255 { 256 return cpu->cpu_index + 1; 257 } 258 259 static void write_guest_note(WriteCoreDumpFunction f, DumpState *s, 260 Error **errp) 261 { 262 int ret; 263 264 if (s->guest_note) { 265 ret = f(s->guest_note, s->guest_note_size, s); 266 if (ret < 0) { 267 error_setg(errp, "dump: failed to write guest note"); 268 } 269 } 270 } 271 272 static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, 273 Error **errp) 274 { 275 CPUState *cpu; 276 int ret; 277 int id; 278 279 CPU_FOREACH(cpu) { 280 id = cpu_index(cpu); 281 ret = cpu_write_elf64_note(f, cpu, id, s); 282 if (ret < 0) { 283 error_setg(errp, "dump: failed to write elf notes"); 284 return; 285 } 286 } 287 288 CPU_FOREACH(cpu) { 289 ret = cpu_write_elf64_qemunote(f, cpu, s); 290 if (ret < 0) { 291 error_setg(errp, "dump: failed to write CPU status"); 292 return; 293 } 294 } 295 296 write_guest_note(f, s, errp); 297 } 298 299 static void write_elf32_note(DumpState *s, Error **errp) 300 { 301 hwaddr begin = s->memory_offset - s->note_size; 302 Elf32_Phdr phdr; 303 int ret; 304 305 memset(&phdr, 0, sizeof(Elf32_Phdr)); 306 phdr.p_type = cpu_to_dump32(s, PT_NOTE); 307 phdr.p_offset = cpu_to_dump32(s, begin); 308 phdr.p_paddr = 0; 309 phdr.p_filesz = cpu_to_dump32(s, s->note_size); 310 phdr.p_memsz = cpu_to_dump32(s, s->note_size); 311 phdr.p_vaddr = 0; 312 313 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); 314 if (ret < 0) { 315 error_setg_errno(errp, -ret, 316 "dump: failed to write program header table"); 317 } 318 } 319 320 static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, 321 Error **errp) 322 { 323 CPUState *cpu; 324 int ret; 325 int id; 326 327 CPU_FOREACH(cpu) { 328 id = cpu_index(cpu); 329 ret = cpu_write_elf32_note(f, cpu, id, s); 330 if (ret < 0) { 331 error_setg(errp, "dump: failed to write elf notes"); 332 return; 333 } 334 } 335 336 CPU_FOREACH(cpu) { 337 ret = cpu_write_elf32_qemunote(f, cpu, s); 338 if (ret < 0) { 339 error_setg(errp, "dump: failed to write CPU status"); 340 return; 341 } 342 } 343 344 write_guest_note(f, s, errp); 345 } 346 347 static void write_elf_section(DumpState *s, int type, Error **errp) 348 { 349 Elf32_Shdr shdr32; 350 Elf64_Shdr shdr64; 351 int shdr_size; 352 void *shdr; 353 int ret; 354 355 if (type == 0) { 356 shdr_size = sizeof(Elf32_Shdr); 357 memset(&shdr32, 0, shdr_size); 358 shdr32.sh_info = cpu_to_dump32(s, s->sh_info); 359 shdr = &shdr32; 360 } else { 361 shdr_size = sizeof(Elf64_Shdr); 362 memset(&shdr64, 0, shdr_size); 363 shdr64.sh_info = cpu_to_dump32(s, s->sh_info); 364 shdr = &shdr64; 365 } 366 367 ret = fd_write_vmcore(shdr, shdr_size, s); 368 if (ret < 0) { 369 error_setg_errno(errp, -ret, 370 "dump: failed to write section header table"); 371 } 372 } 373 374 static void write_data(DumpState *s, void *buf, int length, Error **errp) 375 { 376 int ret; 377 378 ret = fd_write_vmcore(buf, length, s); 379 if (ret < 0) { 380 error_setg_errno(errp, -ret, "dump: failed to save memory"); 381 } else { 382 s->written_size += length; 383 } 384 } 385 386 /* write the memory to vmcore. 1 page per I/O. */ 387 static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, 388 int64_t size, Error **errp) 389 { 390 int64_t i; 391 Error *local_err = NULL; 392 393 for (i = 0; i < size / s->dump_info.page_size; i++) { 394 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 395 s->dump_info.page_size, &local_err); 396 if (local_err) { 397 error_propagate(errp, local_err); 398 return; 399 } 400 } 401 402 if ((size % s->dump_info.page_size) != 0) { 403 write_data(s, block->host_addr + start + i * s->dump_info.page_size, 404 size % s->dump_info.page_size, &local_err); 405 if (local_err) { 406 error_propagate(errp, local_err); 407 return; 408 } 409 } 410 } 411 412 /* get the memory's offset and size in the vmcore */ 413 static void get_offset_range(hwaddr phys_addr, 414 ram_addr_t mapping_length, 415 DumpState *s, 416 hwaddr *p_offset, 417 hwaddr *p_filesz) 418 { 419 GuestPhysBlock *block; 420 hwaddr offset = s->memory_offset; 421 int64_t size_in_block, start; 422 423 /* When the memory is not stored into vmcore, offset will be -1 */ 424 *p_offset = -1; 425 *p_filesz = 0; 426 427 if (s->has_filter) { 428 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { 429 return; 430 } 431 } 432 433 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 434 if (s->has_filter) { 435 if (block->target_start >= s->begin + s->length || 436 block->target_end <= s->begin) { 437 /* This block is out of the range */ 438 continue; 439 } 440 441 if (s->begin <= block->target_start) { 442 start = block->target_start; 443 } else { 444 start = s->begin; 445 } 446 447 size_in_block = block->target_end - start; 448 if (s->begin + s->length < block->target_end) { 449 size_in_block -= block->target_end - (s->begin + s->length); 450 } 451 } else { 452 start = block->target_start; 453 size_in_block = block->target_end - block->target_start; 454 } 455 456 if (phys_addr >= start && phys_addr < start + size_in_block) { 457 *p_offset = phys_addr - start + offset; 458 459 /* The offset range mapped from the vmcore file must not spill over 460 * the GuestPhysBlock, clamp it. The rest of the mapping will be 461 * zero-filled in memory at load time; see 462 * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. 463 */ 464 *p_filesz = phys_addr + mapping_length <= start + size_in_block ? 465 mapping_length : 466 size_in_block - (phys_addr - start); 467 return; 468 } 469 470 offset += size_in_block; 471 } 472 } 473 474 static void write_elf_loads(DumpState *s, Error **errp) 475 { 476 hwaddr offset, filesz; 477 MemoryMapping *memory_mapping; 478 uint32_t phdr_index = 1; 479 uint32_t max_index; 480 Error *local_err = NULL; 481 482 if (s->have_section) { 483 max_index = s->sh_info; 484 } else { 485 max_index = s->phdr_num; 486 } 487 488 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { 489 get_offset_range(memory_mapping->phys_addr, 490 memory_mapping->length, 491 s, &offset, &filesz); 492 if (s->dump_info.d_class == ELFCLASS64) { 493 write_elf64_load(s, memory_mapping, phdr_index++, offset, 494 filesz, &local_err); 495 } else { 496 write_elf32_load(s, memory_mapping, phdr_index++, offset, 497 filesz, &local_err); 498 } 499 500 if (local_err) { 501 error_propagate(errp, local_err); 502 return; 503 } 504 505 if (phdr_index >= max_index) { 506 break; 507 } 508 } 509 } 510 511 /* write elf header, PT_NOTE and elf note to vmcore. */ 512 static void dump_begin(DumpState *s, Error **errp) 513 { 514 Error *local_err = NULL; 515 516 /* 517 * the vmcore's format is: 518 * -------------- 519 * | elf header | 520 * -------------- 521 * | PT_NOTE | 522 * -------------- 523 * | PT_LOAD | 524 * -------------- 525 * | ...... | 526 * -------------- 527 * | PT_LOAD | 528 * -------------- 529 * | sec_hdr | 530 * -------------- 531 * | elf note | 532 * -------------- 533 * | memory | 534 * -------------- 535 * 536 * we only know where the memory is saved after we write elf note into 537 * vmcore. 538 */ 539 540 /* write elf header to vmcore */ 541 if (s->dump_info.d_class == ELFCLASS64) { 542 write_elf64_header(s, &local_err); 543 } else { 544 write_elf32_header(s, &local_err); 545 } 546 if (local_err) { 547 error_propagate(errp, local_err); 548 return; 549 } 550 551 if (s->dump_info.d_class == ELFCLASS64) { 552 /* write PT_NOTE to vmcore */ 553 write_elf64_note(s, &local_err); 554 if (local_err) { 555 error_propagate(errp, local_err); 556 return; 557 } 558 559 /* write all PT_LOAD to vmcore */ 560 write_elf_loads(s, &local_err); 561 if (local_err) { 562 error_propagate(errp, local_err); 563 return; 564 } 565 566 /* write section to vmcore */ 567 if (s->have_section) { 568 write_elf_section(s, 1, &local_err); 569 if (local_err) { 570 error_propagate(errp, local_err); 571 return; 572 } 573 } 574 575 /* write notes to vmcore */ 576 write_elf64_notes(fd_write_vmcore, s, &local_err); 577 if (local_err) { 578 error_propagate(errp, local_err); 579 return; 580 } 581 } else { 582 /* write PT_NOTE to vmcore */ 583 write_elf32_note(s, &local_err); 584 if (local_err) { 585 error_propagate(errp, local_err); 586 return; 587 } 588 589 /* write all PT_LOAD to vmcore */ 590 write_elf_loads(s, &local_err); 591 if (local_err) { 592 error_propagate(errp, local_err); 593 return; 594 } 595 596 /* write section to vmcore */ 597 if (s->have_section) { 598 write_elf_section(s, 0, &local_err); 599 if (local_err) { 600 error_propagate(errp, local_err); 601 return; 602 } 603 } 604 605 /* write notes to vmcore */ 606 write_elf32_notes(fd_write_vmcore, s, &local_err); 607 if (local_err) { 608 error_propagate(errp, local_err); 609 return; 610 } 611 } 612 } 613 614 static int get_next_block(DumpState *s, GuestPhysBlock *block) 615 { 616 while (1) { 617 block = QTAILQ_NEXT(block, next); 618 if (!block) { 619 /* no more block */ 620 return 1; 621 } 622 623 s->start = 0; 624 s->next_block = block; 625 if (s->has_filter) { 626 if (block->target_start >= s->begin + s->length || 627 block->target_end <= s->begin) { 628 /* This block is out of the range */ 629 continue; 630 } 631 632 if (s->begin > block->target_start) { 633 s->start = s->begin - block->target_start; 634 } 635 } 636 637 return 0; 638 } 639 } 640 641 /* write all memory to vmcore */ 642 static void dump_iterate(DumpState *s, Error **errp) 643 { 644 GuestPhysBlock *block; 645 int64_t size; 646 Error *local_err = NULL; 647 648 do { 649 block = s->next_block; 650 651 size = block->target_end - block->target_start; 652 if (s->has_filter) { 653 size -= s->start; 654 if (s->begin + s->length < block->target_end) { 655 size -= block->target_end - (s->begin + s->length); 656 } 657 } 658 write_memory(s, block, s->start, size, &local_err); 659 if (local_err) { 660 error_propagate(errp, local_err); 661 return; 662 } 663 664 } while (!get_next_block(s, block)); 665 } 666 667 static void create_vmcore(DumpState *s, Error **errp) 668 { 669 Error *local_err = NULL; 670 671 dump_begin(s, &local_err); 672 if (local_err) { 673 error_propagate(errp, local_err); 674 return; 675 } 676 677 dump_iterate(s, errp); 678 } 679 680 static int write_start_flat_header(int fd) 681 { 682 MakedumpfileHeader *mh; 683 int ret = 0; 684 685 QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); 686 mh = g_malloc0(MAX_SIZE_MDF_HEADER); 687 688 memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, 689 MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); 690 691 mh->type = cpu_to_be64(TYPE_FLAT_HEADER); 692 mh->version = cpu_to_be64(VERSION_FLAT_HEADER); 693 694 size_t written_size; 695 written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); 696 if (written_size != MAX_SIZE_MDF_HEADER) { 697 ret = -1; 698 } 699 700 g_free(mh); 701 return ret; 702 } 703 704 static int write_end_flat_header(int fd) 705 { 706 MakedumpfileDataHeader mdh; 707 708 mdh.offset = END_FLAG_FLAT_HEADER; 709 mdh.buf_size = END_FLAG_FLAT_HEADER; 710 711 size_t written_size; 712 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 713 if (written_size != sizeof(mdh)) { 714 return -1; 715 } 716 717 return 0; 718 } 719 720 static int write_buffer(int fd, off_t offset, const void *buf, size_t size) 721 { 722 size_t written_size; 723 MakedumpfileDataHeader mdh; 724 725 mdh.offset = cpu_to_be64(offset); 726 mdh.buf_size = cpu_to_be64(size); 727 728 written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); 729 if (written_size != sizeof(mdh)) { 730 return -1; 731 } 732 733 written_size = qemu_write_full(fd, buf, size); 734 if (written_size != size) { 735 return -1; 736 } 737 738 return 0; 739 } 740 741 static int buf_write_note(const void *buf, size_t size, void *opaque) 742 { 743 DumpState *s = opaque; 744 745 /* note_buf is not enough */ 746 if (s->note_buf_offset + size > s->note_size) { 747 return -1; 748 } 749 750 memcpy(s->note_buf + s->note_buf_offset, buf, size); 751 752 s->note_buf_offset += size; 753 754 return 0; 755 } 756 757 /* 758 * This function retrieves various sizes from an elf header. 759 * 760 * @note has to be a valid ELF note. The return sizes are unmodified 761 * (not padded or rounded up to be multiple of 4). 762 */ 763 static void get_note_sizes(DumpState *s, const void *note, 764 uint64_t *note_head_size, 765 uint64_t *name_size, 766 uint64_t *desc_size) 767 { 768 uint64_t note_head_sz; 769 uint64_t name_sz; 770 uint64_t desc_sz; 771 772 if (s->dump_info.d_class == ELFCLASS64) { 773 const Elf64_Nhdr *hdr = note; 774 note_head_sz = sizeof(Elf64_Nhdr); 775 name_sz = tswap64(hdr->n_namesz); 776 desc_sz = tswap64(hdr->n_descsz); 777 } else { 778 const Elf32_Nhdr *hdr = note; 779 note_head_sz = sizeof(Elf32_Nhdr); 780 name_sz = tswap32(hdr->n_namesz); 781 desc_sz = tswap32(hdr->n_descsz); 782 } 783 784 if (note_head_size) { 785 *note_head_size = note_head_sz; 786 } 787 if (name_size) { 788 *name_size = name_sz; 789 } 790 if (desc_size) { 791 *desc_size = desc_sz; 792 } 793 } 794 795 static bool note_name_equal(DumpState *s, 796 const uint8_t *note, const char *name) 797 { 798 int len = strlen(name) + 1; 799 uint64_t head_size, name_size; 800 801 get_note_sizes(s, note, &head_size, &name_size, NULL); 802 head_size = ROUND_UP(head_size, 4); 803 804 return name_size == len && memcmp(note + head_size, name, len) == 0; 805 } 806 807 /* write common header, sub header and elf note to vmcore */ 808 static void create_header32(DumpState *s, Error **errp) 809 { 810 DiskDumpHeader32 *dh = NULL; 811 KdumpSubHeader32 *kh = NULL; 812 size_t size; 813 uint32_t block_size; 814 uint32_t sub_hdr_size; 815 uint32_t bitmap_blocks; 816 uint32_t status = 0; 817 uint64_t offset_note; 818 Error *local_err = NULL; 819 820 /* write common header, the version of kdump-compressed format is 6th */ 821 size = sizeof(DiskDumpHeader32); 822 dh = g_malloc0(size); 823 824 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 825 dh->header_version = cpu_to_dump32(s, 6); 826 block_size = s->dump_info.page_size; 827 dh->block_size = cpu_to_dump32(s, block_size); 828 sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; 829 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 830 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 831 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 832 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 833 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 834 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 835 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 836 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 837 838 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 839 status |= DUMP_DH_COMPRESSED_ZLIB; 840 } 841 #ifdef CONFIG_LZO 842 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 843 status |= DUMP_DH_COMPRESSED_LZO; 844 } 845 #endif 846 #ifdef CONFIG_SNAPPY 847 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 848 status |= DUMP_DH_COMPRESSED_SNAPPY; 849 } 850 #endif 851 dh->status = cpu_to_dump32(s, status); 852 853 if (write_buffer(s->fd, 0, dh, size) < 0) { 854 error_setg(errp, "dump: failed to write disk dump header"); 855 goto out; 856 } 857 858 /* write sub header */ 859 size = sizeof(KdumpSubHeader32); 860 kh = g_malloc0(size); 861 862 /* 64bit max_mapnr_64 */ 863 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 864 kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); 865 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 866 867 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 868 if (s->guest_note && 869 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 870 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 871 872 get_note_sizes(s, s->guest_note, 873 &hsize, &name_size, &size_vmcoreinfo_desc); 874 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 875 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 876 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 877 kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); 878 } 879 880 kh->offset_note = cpu_to_dump64(s, offset_note); 881 kh->note_size = cpu_to_dump32(s, s->note_size); 882 883 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 884 block_size, kh, size) < 0) { 885 error_setg(errp, "dump: failed to write kdump sub header"); 886 goto out; 887 } 888 889 /* write note */ 890 s->note_buf = g_malloc0(s->note_size); 891 s->note_buf_offset = 0; 892 893 /* use s->note_buf to store notes temporarily */ 894 write_elf32_notes(buf_write_note, s, &local_err); 895 if (local_err) { 896 error_propagate(errp, local_err); 897 goto out; 898 } 899 if (write_buffer(s->fd, offset_note, s->note_buf, 900 s->note_size) < 0) { 901 error_setg(errp, "dump: failed to write notes"); 902 goto out; 903 } 904 905 /* get offset of dump_bitmap */ 906 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 907 block_size; 908 909 /* get offset of page */ 910 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 911 block_size; 912 913 out: 914 g_free(dh); 915 g_free(kh); 916 g_free(s->note_buf); 917 } 918 919 /* write common header, sub header and elf note to vmcore */ 920 static void create_header64(DumpState *s, Error **errp) 921 { 922 DiskDumpHeader64 *dh = NULL; 923 KdumpSubHeader64 *kh = NULL; 924 size_t size; 925 uint32_t block_size; 926 uint32_t sub_hdr_size; 927 uint32_t bitmap_blocks; 928 uint32_t status = 0; 929 uint64_t offset_note; 930 Error *local_err = NULL; 931 932 /* write common header, the version of kdump-compressed format is 6th */ 933 size = sizeof(DiskDumpHeader64); 934 dh = g_malloc0(size); 935 936 memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); 937 dh->header_version = cpu_to_dump32(s, 6); 938 block_size = s->dump_info.page_size; 939 dh->block_size = cpu_to_dump32(s, block_size); 940 sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; 941 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); 942 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); 943 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ 944 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); 945 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); 946 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; 947 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); 948 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); 949 950 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { 951 status |= DUMP_DH_COMPRESSED_ZLIB; 952 } 953 #ifdef CONFIG_LZO 954 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { 955 status |= DUMP_DH_COMPRESSED_LZO; 956 } 957 #endif 958 #ifdef CONFIG_SNAPPY 959 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { 960 status |= DUMP_DH_COMPRESSED_SNAPPY; 961 } 962 #endif 963 dh->status = cpu_to_dump32(s, status); 964 965 if (write_buffer(s->fd, 0, dh, size) < 0) { 966 error_setg(errp, "dump: failed to write disk dump header"); 967 goto out; 968 } 969 970 /* write sub header */ 971 size = sizeof(KdumpSubHeader64); 972 kh = g_malloc0(size); 973 974 /* 64bit max_mapnr_64 */ 975 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); 976 kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); 977 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); 978 979 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; 980 if (s->guest_note && 981 note_name_equal(s, s->guest_note, "VMCOREINFO")) { 982 uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; 983 984 get_note_sizes(s, s->guest_note, 985 &hsize, &name_size, &size_vmcoreinfo_desc); 986 offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + 987 (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; 988 kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); 989 kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); 990 } 991 992 kh->offset_note = cpu_to_dump64(s, offset_note); 993 kh->note_size = cpu_to_dump64(s, s->note_size); 994 995 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * 996 block_size, kh, size) < 0) { 997 error_setg(errp, "dump: failed to write kdump sub header"); 998 goto out; 999 } 1000 1001 /* write note */ 1002 s->note_buf = g_malloc0(s->note_size); 1003 s->note_buf_offset = 0; 1004 1005 /* use s->note_buf to store notes temporarily */ 1006 write_elf64_notes(buf_write_note, s, &local_err); 1007 if (local_err) { 1008 error_propagate(errp, local_err); 1009 goto out; 1010 } 1011 1012 if (write_buffer(s->fd, offset_note, s->note_buf, 1013 s->note_size) < 0) { 1014 error_setg(errp, "dump: failed to write notes"); 1015 goto out; 1016 } 1017 1018 /* get offset of dump_bitmap */ 1019 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * 1020 block_size; 1021 1022 /* get offset of page */ 1023 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * 1024 block_size; 1025 1026 out: 1027 g_free(dh); 1028 g_free(kh); 1029 g_free(s->note_buf); 1030 } 1031 1032 static void write_dump_header(DumpState *s, Error **errp) 1033 { 1034 if (s->dump_info.d_class == ELFCLASS32) { 1035 create_header32(s, errp); 1036 } else { 1037 create_header64(s, errp); 1038 } 1039 } 1040 1041 static size_t dump_bitmap_get_bufsize(DumpState *s) 1042 { 1043 return s->dump_info.page_size; 1044 } 1045 1046 /* 1047 * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be 1048 * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. 1049 * set_dump_bitmap will always leave the recently set bit un-sync. And setting 1050 * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into 1051 * vmcore, ie. synchronizing un-sync bit into vmcore. 1052 */ 1053 static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, 1054 uint8_t *buf, DumpState *s) 1055 { 1056 off_t old_offset, new_offset; 1057 off_t offset_bitmap1, offset_bitmap2; 1058 uint32_t byte, bit; 1059 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1060 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1061 1062 /* should not set the previous place */ 1063 assert(last_pfn <= pfn); 1064 1065 /* 1066 * if the bit needed to be set is not cached in buf, flush the data in buf 1067 * to vmcore firstly. 1068 * making new_offset be bigger than old_offset can also sync remained data 1069 * into vmcore. 1070 */ 1071 old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); 1072 new_offset = bitmap_bufsize * (pfn / bits_per_buf); 1073 1074 while (old_offset < new_offset) { 1075 /* calculate the offset and write dump_bitmap */ 1076 offset_bitmap1 = s->offset_dump_bitmap + old_offset; 1077 if (write_buffer(s->fd, offset_bitmap1, buf, 1078 bitmap_bufsize) < 0) { 1079 return -1; 1080 } 1081 1082 /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ 1083 offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + 1084 old_offset; 1085 if (write_buffer(s->fd, offset_bitmap2, buf, 1086 bitmap_bufsize) < 0) { 1087 return -1; 1088 } 1089 1090 memset(buf, 0, bitmap_bufsize); 1091 old_offset += bitmap_bufsize; 1092 } 1093 1094 /* get the exact place of the bit in the buf, and set it */ 1095 byte = (pfn % bits_per_buf) / CHAR_BIT; 1096 bit = (pfn % bits_per_buf) % CHAR_BIT; 1097 if (value) { 1098 buf[byte] |= 1u << bit; 1099 } else { 1100 buf[byte] &= ~(1u << bit); 1101 } 1102 1103 return 0; 1104 } 1105 1106 static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) 1107 { 1108 int target_page_shift = ctz32(s->dump_info.page_size); 1109 1110 return (addr >> target_page_shift) - ARCH_PFN_OFFSET; 1111 } 1112 1113 static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) 1114 { 1115 int target_page_shift = ctz32(s->dump_info.page_size); 1116 1117 return (pfn + ARCH_PFN_OFFSET) << target_page_shift; 1118 } 1119 1120 /* 1121 * exam every page and return the page frame number and the address of the page. 1122 * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys 1123 * blocks, so block->target_start and block->target_end should be interal 1124 * multiples of the target page size. 1125 */ 1126 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, 1127 uint8_t **bufptr, DumpState *s) 1128 { 1129 GuestPhysBlock *block = *blockptr; 1130 hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); 1131 uint8_t *buf; 1132 1133 /* block == NULL means the start of the iteration */ 1134 if (!block) { 1135 block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1136 *blockptr = block; 1137 assert((block->target_start & ~target_page_mask) == 0); 1138 assert((block->target_end & ~target_page_mask) == 0); 1139 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1140 if (bufptr) { 1141 *bufptr = block->host_addr; 1142 } 1143 return true; 1144 } 1145 1146 *pfnptr = *pfnptr + 1; 1147 addr = dump_pfn_to_paddr(s, *pfnptr); 1148 1149 if ((addr >= block->target_start) && 1150 (addr + s->dump_info.page_size <= block->target_end)) { 1151 buf = block->host_addr + (addr - block->target_start); 1152 } else { 1153 /* the next page is in the next block */ 1154 block = QTAILQ_NEXT(block, next); 1155 *blockptr = block; 1156 if (!block) { 1157 return false; 1158 } 1159 assert((block->target_start & ~target_page_mask) == 0); 1160 assert((block->target_end & ~target_page_mask) == 0); 1161 *pfnptr = dump_paddr_to_pfn(s, block->target_start); 1162 buf = block->host_addr; 1163 } 1164 1165 if (bufptr) { 1166 *bufptr = buf; 1167 } 1168 1169 return true; 1170 } 1171 1172 static void write_dump_bitmap(DumpState *s, Error **errp) 1173 { 1174 int ret = 0; 1175 uint64_t last_pfn, pfn; 1176 void *dump_bitmap_buf; 1177 size_t num_dumpable; 1178 GuestPhysBlock *block_iter = NULL; 1179 size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); 1180 size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; 1181 1182 /* dump_bitmap_buf is used to store dump_bitmap temporarily */ 1183 dump_bitmap_buf = g_malloc0(bitmap_bufsize); 1184 1185 num_dumpable = 0; 1186 last_pfn = 0; 1187 1188 /* 1189 * exam memory page by page, and set the bit in dump_bitmap corresponded 1190 * to the existing page. 1191 */ 1192 while (get_next_page(&block_iter, &pfn, NULL, s)) { 1193 ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); 1194 if (ret < 0) { 1195 error_setg(errp, "dump: failed to set dump_bitmap"); 1196 goto out; 1197 } 1198 1199 last_pfn = pfn; 1200 num_dumpable++; 1201 } 1202 1203 /* 1204 * set_dump_bitmap will always leave the recently set bit un-sync. Here we 1205 * set the remaining bits from last_pfn to the end of the bitmap buffer to 1206 * 0. With those set, the un-sync bit will be synchronized into the vmcore. 1207 */ 1208 if (num_dumpable > 0) { 1209 ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, 1210 dump_bitmap_buf, s); 1211 if (ret < 0) { 1212 error_setg(errp, "dump: failed to sync dump_bitmap"); 1213 goto out; 1214 } 1215 } 1216 1217 /* number of dumpable pages that will be dumped later */ 1218 s->num_dumpable = num_dumpable; 1219 1220 out: 1221 g_free(dump_bitmap_buf); 1222 } 1223 1224 static void prepare_data_cache(DataCache *data_cache, DumpState *s, 1225 off_t offset) 1226 { 1227 data_cache->fd = s->fd; 1228 data_cache->data_size = 0; 1229 data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); 1230 data_cache->buf = g_malloc0(data_cache->buf_size); 1231 data_cache->offset = offset; 1232 } 1233 1234 static int write_cache(DataCache *dc, const void *buf, size_t size, 1235 bool flag_sync) 1236 { 1237 /* 1238 * dc->buf_size should not be less than size, otherwise dc will never be 1239 * enough 1240 */ 1241 assert(size <= dc->buf_size); 1242 1243 /* 1244 * if flag_sync is set, synchronize data in dc->buf into vmcore. 1245 * otherwise check if the space is enough for caching data in buf, if not, 1246 * write the data in dc->buf to dc->fd and reset dc->buf 1247 */ 1248 if ((!flag_sync && dc->data_size + size > dc->buf_size) || 1249 (flag_sync && dc->data_size > 0)) { 1250 if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { 1251 return -1; 1252 } 1253 1254 dc->offset += dc->data_size; 1255 dc->data_size = 0; 1256 } 1257 1258 if (!flag_sync) { 1259 memcpy(dc->buf + dc->data_size, buf, size); 1260 dc->data_size += size; 1261 } 1262 1263 return 0; 1264 } 1265 1266 static void free_data_cache(DataCache *data_cache) 1267 { 1268 g_free(data_cache->buf); 1269 } 1270 1271 static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) 1272 { 1273 switch (flag_compress) { 1274 case DUMP_DH_COMPRESSED_ZLIB: 1275 return compressBound(page_size); 1276 1277 case DUMP_DH_COMPRESSED_LZO: 1278 /* 1279 * LZO will expand incompressible data by a little amount. Please check 1280 * the following URL to see the expansion calculation: 1281 * http://www.oberhumer.com/opensource/lzo/lzofaq.php 1282 */ 1283 return page_size + page_size / 16 + 64 + 3; 1284 1285 #ifdef CONFIG_SNAPPY 1286 case DUMP_DH_COMPRESSED_SNAPPY: 1287 return snappy_max_compressed_length(page_size); 1288 #endif 1289 } 1290 return 0; 1291 } 1292 1293 /* 1294 * check if the page is all 0 1295 */ 1296 static inline bool is_zero_page(const uint8_t *buf, size_t page_size) 1297 { 1298 return buffer_is_zero(buf, page_size); 1299 } 1300 1301 static void write_dump_pages(DumpState *s, Error **errp) 1302 { 1303 int ret = 0; 1304 DataCache page_desc, page_data; 1305 size_t len_buf_out, size_out; 1306 #ifdef CONFIG_LZO 1307 lzo_bytep wrkmem = NULL; 1308 #endif 1309 uint8_t *buf_out = NULL; 1310 off_t offset_desc, offset_data; 1311 PageDescriptor pd, pd_zero; 1312 uint8_t *buf; 1313 GuestPhysBlock *block_iter = NULL; 1314 uint64_t pfn_iter; 1315 1316 /* get offset of page_desc and page_data in dump file */ 1317 offset_desc = s->offset_page; 1318 offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; 1319 1320 prepare_data_cache(&page_desc, s, offset_desc); 1321 prepare_data_cache(&page_data, s, offset_data); 1322 1323 /* prepare buffer to store compressed data */ 1324 len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); 1325 assert(len_buf_out != 0); 1326 1327 #ifdef CONFIG_LZO 1328 wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); 1329 #endif 1330 1331 buf_out = g_malloc(len_buf_out); 1332 1333 /* 1334 * init zero page's page_desc and page_data, because every zero page 1335 * uses the same page_data 1336 */ 1337 pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); 1338 pd_zero.flags = cpu_to_dump32(s, 0); 1339 pd_zero.offset = cpu_to_dump64(s, offset_data); 1340 pd_zero.page_flags = cpu_to_dump64(s, 0); 1341 buf = g_malloc0(s->dump_info.page_size); 1342 ret = write_cache(&page_data, buf, s->dump_info.page_size, false); 1343 g_free(buf); 1344 if (ret < 0) { 1345 error_setg(errp, "dump: failed to write page data (zero page)"); 1346 goto out; 1347 } 1348 1349 offset_data += s->dump_info.page_size; 1350 1351 /* 1352 * dump memory to vmcore page by page. zero page will all be resided in the 1353 * first page of page section 1354 */ 1355 while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { 1356 /* check zero page */ 1357 if (is_zero_page(buf, s->dump_info.page_size)) { 1358 ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), 1359 false); 1360 if (ret < 0) { 1361 error_setg(errp, "dump: failed to write page desc"); 1362 goto out; 1363 } 1364 } else { 1365 /* 1366 * not zero page, then: 1367 * 1. compress the page 1368 * 2. write the compressed page into the cache of page_data 1369 * 3. get page desc of the compressed page and write it into the 1370 * cache of page_desc 1371 * 1372 * only one compression format will be used here, for 1373 * s->flag_compress is set. But when compression fails to work, 1374 * we fall back to save in plaintext. 1375 */ 1376 size_out = len_buf_out; 1377 if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && 1378 (compress2(buf_out, (uLongf *)&size_out, buf, 1379 s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && 1380 (size_out < s->dump_info.page_size)) { 1381 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); 1382 pd.size = cpu_to_dump32(s, size_out); 1383 1384 ret = write_cache(&page_data, buf_out, size_out, false); 1385 if (ret < 0) { 1386 error_setg(errp, "dump: failed to write page data"); 1387 goto out; 1388 } 1389 #ifdef CONFIG_LZO 1390 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && 1391 (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, 1392 (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && 1393 (size_out < s->dump_info.page_size)) { 1394 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); 1395 pd.size = cpu_to_dump32(s, size_out); 1396 1397 ret = write_cache(&page_data, buf_out, size_out, false); 1398 if (ret < 0) { 1399 error_setg(errp, "dump: failed to write page data"); 1400 goto out; 1401 } 1402 #endif 1403 #ifdef CONFIG_SNAPPY 1404 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && 1405 (snappy_compress((char *)buf, s->dump_info.page_size, 1406 (char *)buf_out, &size_out) == SNAPPY_OK) && 1407 (size_out < s->dump_info.page_size)) { 1408 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); 1409 pd.size = cpu_to_dump32(s, size_out); 1410 1411 ret = write_cache(&page_data, buf_out, size_out, false); 1412 if (ret < 0) { 1413 error_setg(errp, "dump: failed to write page data"); 1414 goto out; 1415 } 1416 #endif 1417 } else { 1418 /* 1419 * fall back to save in plaintext, size_out should be 1420 * assigned the target's page size 1421 */ 1422 pd.flags = cpu_to_dump32(s, 0); 1423 size_out = s->dump_info.page_size; 1424 pd.size = cpu_to_dump32(s, size_out); 1425 1426 ret = write_cache(&page_data, buf, 1427 s->dump_info.page_size, false); 1428 if (ret < 0) { 1429 error_setg(errp, "dump: failed to write page data"); 1430 goto out; 1431 } 1432 } 1433 1434 /* get and write page desc here */ 1435 pd.page_flags = cpu_to_dump64(s, 0); 1436 pd.offset = cpu_to_dump64(s, offset_data); 1437 offset_data += size_out; 1438 1439 ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); 1440 if (ret < 0) { 1441 error_setg(errp, "dump: failed to write page desc"); 1442 goto out; 1443 } 1444 } 1445 s->written_size += s->dump_info.page_size; 1446 } 1447 1448 ret = write_cache(&page_desc, NULL, 0, true); 1449 if (ret < 0) { 1450 error_setg(errp, "dump: failed to sync cache for page_desc"); 1451 goto out; 1452 } 1453 ret = write_cache(&page_data, NULL, 0, true); 1454 if (ret < 0) { 1455 error_setg(errp, "dump: failed to sync cache for page_data"); 1456 goto out; 1457 } 1458 1459 out: 1460 free_data_cache(&page_desc); 1461 free_data_cache(&page_data); 1462 1463 #ifdef CONFIG_LZO 1464 g_free(wrkmem); 1465 #endif 1466 1467 g_free(buf_out); 1468 } 1469 1470 static void create_kdump_vmcore(DumpState *s, Error **errp) 1471 { 1472 int ret; 1473 Error *local_err = NULL; 1474 1475 /* 1476 * the kdump-compressed format is: 1477 * File offset 1478 * +------------------------------------------+ 0x0 1479 * | main header (struct disk_dump_header) | 1480 * |------------------------------------------+ block 1 1481 * | sub header (struct kdump_sub_header) | 1482 * |------------------------------------------+ block 2 1483 * | 1st-dump_bitmap | 1484 * |------------------------------------------+ block 2 + X blocks 1485 * | 2nd-dump_bitmap | (aligned by block) 1486 * |------------------------------------------+ block 2 + 2 * X blocks 1487 * | page desc for pfn 0 (struct page_desc) | (aligned by block) 1488 * | page desc for pfn 1 (struct page_desc) | 1489 * | : | 1490 * |------------------------------------------| (not aligned by block) 1491 * | page data (pfn 0) | 1492 * | page data (pfn 1) | 1493 * | : | 1494 * +------------------------------------------+ 1495 */ 1496 1497 ret = write_start_flat_header(s->fd); 1498 if (ret < 0) { 1499 error_setg(errp, "dump: failed to write start flat header"); 1500 return; 1501 } 1502 1503 write_dump_header(s, &local_err); 1504 if (local_err) { 1505 error_propagate(errp, local_err); 1506 return; 1507 } 1508 1509 write_dump_bitmap(s, &local_err); 1510 if (local_err) { 1511 error_propagate(errp, local_err); 1512 return; 1513 } 1514 1515 write_dump_pages(s, &local_err); 1516 if (local_err) { 1517 error_propagate(errp, local_err); 1518 return; 1519 } 1520 1521 ret = write_end_flat_header(s->fd); 1522 if (ret < 0) { 1523 error_setg(errp, "dump: failed to write end flat header"); 1524 return; 1525 } 1526 } 1527 1528 static ram_addr_t get_start_block(DumpState *s) 1529 { 1530 GuestPhysBlock *block; 1531 1532 if (!s->has_filter) { 1533 s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); 1534 return 0; 1535 } 1536 1537 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1538 if (block->target_start >= s->begin + s->length || 1539 block->target_end <= s->begin) { 1540 /* This block is out of the range */ 1541 continue; 1542 } 1543 1544 s->next_block = block; 1545 if (s->begin > block->target_start) { 1546 s->start = s->begin - block->target_start; 1547 } else { 1548 s->start = 0; 1549 } 1550 return s->start; 1551 } 1552 1553 return -1; 1554 } 1555 1556 static void get_max_mapnr(DumpState *s) 1557 { 1558 GuestPhysBlock *last_block; 1559 1560 last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); 1561 s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); 1562 } 1563 1564 static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; 1565 1566 static void dump_state_prepare(DumpState *s) 1567 { 1568 /* zero the struct, setting status to active */ 1569 *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; 1570 } 1571 1572 bool dump_in_progress(void) 1573 { 1574 DumpState *state = &dump_state_global; 1575 return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE); 1576 } 1577 1578 /* calculate total size of memory to be dumped (taking filter into 1579 * acoount.) */ 1580 static int64_t dump_calculate_size(DumpState *s) 1581 { 1582 GuestPhysBlock *block; 1583 int64_t size = 0, total = 0, left = 0, right = 0; 1584 1585 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { 1586 if (s->has_filter) { 1587 /* calculate the overlapped region. */ 1588 left = MAX(s->begin, block->target_start); 1589 right = MIN(s->begin + s->length, block->target_end); 1590 size = right - left; 1591 size = size > 0 ? size : 0; 1592 } else { 1593 /* count the whole region in */ 1594 size = (block->target_end - block->target_start); 1595 } 1596 total += size; 1597 } 1598 1599 return total; 1600 } 1601 1602 static void vmcoreinfo_update_phys_base(DumpState *s) 1603 { 1604 uint64_t size, note_head_size, name_size, phys_base; 1605 char **lines; 1606 uint8_t *vmci; 1607 size_t i; 1608 1609 if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { 1610 return; 1611 } 1612 1613 get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); 1614 note_head_size = ROUND_UP(note_head_size, 4); 1615 1616 vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); 1617 *(vmci + size) = '\0'; 1618 1619 lines = g_strsplit((char *)vmci, "\n", -1); 1620 for (i = 0; lines[i]; i++) { 1621 const char *prefix = NULL; 1622 1623 if (s->dump_info.d_machine == EM_X86_64) { 1624 prefix = "NUMBER(phys_base)="; 1625 } else if (s->dump_info.d_machine == EM_AARCH64) { 1626 prefix = "NUMBER(PHYS_OFFSET)="; 1627 } 1628 1629 if (prefix && g_str_has_prefix(lines[i], prefix)) { 1630 if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, 1631 &phys_base) < 0) { 1632 warn_report("Failed to read %s", prefix); 1633 } else { 1634 s->dump_info.phys_base = phys_base; 1635 } 1636 break; 1637 } 1638 } 1639 1640 g_strfreev(lines); 1641 } 1642 1643 static void dump_init(DumpState *s, int fd, bool has_format, 1644 DumpGuestMemoryFormat format, bool paging, bool has_filter, 1645 int64_t begin, int64_t length, Error **errp) 1646 { 1647 VMCoreInfoState *vmci = vmcoreinfo_find(); 1648 CPUState *cpu; 1649 int nr_cpus; 1650 Error *err = NULL; 1651 int ret; 1652 1653 s->has_format = has_format; 1654 s->format = format; 1655 s->written_size = 0; 1656 1657 /* kdump-compressed is conflict with paging and filter */ 1658 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1659 assert(!paging && !has_filter); 1660 } 1661 1662 if (runstate_is_running()) { 1663 vm_stop(RUN_STATE_SAVE_VM); 1664 s->resume = true; 1665 } else { 1666 s->resume = false; 1667 } 1668 1669 /* If we use KVM, we should synchronize the registers before we get dump 1670 * info or physmap info. 1671 */ 1672 cpu_synchronize_all_states(); 1673 nr_cpus = 0; 1674 CPU_FOREACH(cpu) { 1675 nr_cpus++; 1676 } 1677 1678 s->fd = fd; 1679 s->has_filter = has_filter; 1680 s->begin = begin; 1681 s->length = length; 1682 1683 memory_mapping_list_init(&s->list); 1684 1685 guest_phys_blocks_init(&s->guest_phys_blocks); 1686 guest_phys_blocks_append(&s->guest_phys_blocks); 1687 s->total_size = dump_calculate_size(s); 1688 #ifdef DEBUG_DUMP_GUEST_MEMORY 1689 fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); 1690 #endif 1691 1692 /* it does not make sense to dump non-existent memory */ 1693 if (!s->total_size) { 1694 error_setg(errp, "dump: no guest memory to dump"); 1695 goto cleanup; 1696 } 1697 1698 s->start = get_start_block(s); 1699 if (s->start == -1) { 1700 error_setg(errp, QERR_INVALID_PARAMETER, "begin"); 1701 goto cleanup; 1702 } 1703 1704 /* get dump info: endian, class and architecture. 1705 * If the target architecture is not supported, cpu_get_dump_info() will 1706 * return -1. 1707 */ 1708 ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); 1709 if (ret < 0) { 1710 error_setg(errp, QERR_UNSUPPORTED); 1711 goto cleanup; 1712 } 1713 1714 if (!s->dump_info.page_size) { 1715 s->dump_info.page_size = TARGET_PAGE_SIZE; 1716 } 1717 1718 s->note_size = cpu_get_note_size(s->dump_info.d_class, 1719 s->dump_info.d_machine, nr_cpus); 1720 if (s->note_size < 0) { 1721 error_setg(errp, QERR_UNSUPPORTED); 1722 goto cleanup; 1723 } 1724 1725 /* 1726 * The goal of this block is to (a) update the previously guessed 1727 * phys_base, (b) copy the guest note out of the guest. 1728 * Failure to do so is not fatal for dumping. 1729 */ 1730 if (vmci) { 1731 uint64_t addr, note_head_size, name_size, desc_size; 1732 uint32_t size; 1733 uint16_t format; 1734 1735 note_head_size = s->dump_info.d_class == ELFCLASS32 ? 1736 sizeof(Elf32_Nhdr) : sizeof(Elf64_Nhdr); 1737 1738 format = le16_to_cpu(vmci->vmcoreinfo.guest_format); 1739 size = le32_to_cpu(vmci->vmcoreinfo.size); 1740 addr = le64_to_cpu(vmci->vmcoreinfo.paddr); 1741 if (!vmci->has_vmcoreinfo) { 1742 warn_report("guest note is not present"); 1743 } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { 1744 warn_report("guest note size is invalid: %" PRIu32, size); 1745 } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { 1746 warn_report("guest note format is unsupported: %" PRIu16, format); 1747 } else { 1748 s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ 1749 cpu_physical_memory_read(addr, s->guest_note, size); 1750 1751 get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); 1752 s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, 1753 desc_size); 1754 if (name_size > MAX_GUEST_NOTE_SIZE || 1755 desc_size > MAX_GUEST_NOTE_SIZE || 1756 s->guest_note_size > size) { 1757 warn_report("Invalid guest note header"); 1758 g_free(s->guest_note); 1759 s->guest_note = NULL; 1760 } else { 1761 vmcoreinfo_update_phys_base(s); 1762 s->note_size += s->guest_note_size; 1763 } 1764 } 1765 } 1766 1767 /* get memory mapping */ 1768 if (paging) { 1769 qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err); 1770 if (err != NULL) { 1771 error_propagate(errp, err); 1772 goto cleanup; 1773 } 1774 } else { 1775 qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); 1776 } 1777 1778 s->nr_cpus = nr_cpus; 1779 1780 get_max_mapnr(s); 1781 1782 uint64_t tmp; 1783 tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), 1784 s->dump_info.page_size); 1785 s->len_dump_bitmap = tmp * s->dump_info.page_size; 1786 1787 /* init for kdump-compressed format */ 1788 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1789 switch (format) { 1790 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: 1791 s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; 1792 break; 1793 1794 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: 1795 #ifdef CONFIG_LZO 1796 if (lzo_init() != LZO_E_OK) { 1797 error_setg(errp, "failed to initialize the LZO library"); 1798 goto cleanup; 1799 } 1800 #endif 1801 s->flag_compress = DUMP_DH_COMPRESSED_LZO; 1802 break; 1803 1804 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: 1805 s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; 1806 break; 1807 1808 default: 1809 s->flag_compress = 0; 1810 } 1811 1812 return; 1813 } 1814 1815 if (s->has_filter) { 1816 memory_mapping_filter(&s->list, s->begin, s->length); 1817 } 1818 1819 /* 1820 * calculate phdr_num 1821 * 1822 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow 1823 */ 1824 s->phdr_num = 1; /* PT_NOTE */ 1825 if (s->list.num < UINT16_MAX - 2) { 1826 s->phdr_num += s->list.num; 1827 s->have_section = false; 1828 } else { 1829 s->have_section = true; 1830 s->phdr_num = PN_XNUM; 1831 s->sh_info = 1; /* PT_NOTE */ 1832 1833 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ 1834 if (s->list.num <= UINT32_MAX - 1) { 1835 s->sh_info += s->list.num; 1836 } else { 1837 s->sh_info = UINT32_MAX; 1838 } 1839 } 1840 1841 if (s->dump_info.d_class == ELFCLASS64) { 1842 if (s->have_section) { 1843 s->memory_offset = sizeof(Elf64_Ehdr) + 1844 sizeof(Elf64_Phdr) * s->sh_info + 1845 sizeof(Elf64_Shdr) + s->note_size; 1846 } else { 1847 s->memory_offset = sizeof(Elf64_Ehdr) + 1848 sizeof(Elf64_Phdr) * s->phdr_num + s->note_size; 1849 } 1850 } else { 1851 if (s->have_section) { 1852 s->memory_offset = sizeof(Elf32_Ehdr) + 1853 sizeof(Elf32_Phdr) * s->sh_info + 1854 sizeof(Elf32_Shdr) + s->note_size; 1855 } else { 1856 s->memory_offset = sizeof(Elf32_Ehdr) + 1857 sizeof(Elf32_Phdr) * s->phdr_num + s->note_size; 1858 } 1859 } 1860 1861 return; 1862 1863 cleanup: 1864 dump_cleanup(s); 1865 } 1866 1867 /* this operation might be time consuming. */ 1868 static void dump_process(DumpState *s, Error **errp) 1869 { 1870 Error *local_err = NULL; 1871 DumpQueryResult *result = NULL; 1872 1873 if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1874 #ifdef TARGET_X86_64 1875 create_win_dump(s, &local_err); 1876 #endif 1877 } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { 1878 create_kdump_vmcore(s, &local_err); 1879 } else { 1880 create_vmcore(s, &local_err); 1881 } 1882 1883 /* make sure status is written after written_size updates */ 1884 smp_wmb(); 1885 qatomic_set(&s->status, 1886 (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); 1887 1888 /* send DUMP_COMPLETED message (unconditionally) */ 1889 result = qmp_query_dump(NULL); 1890 /* should never fail */ 1891 assert(result); 1892 qapi_event_send_dump_completed(result, !!local_err, (local_err ? 1893 error_get_pretty(local_err) : NULL)); 1894 qapi_free_DumpQueryResult(result); 1895 1896 error_propagate(errp, local_err); 1897 dump_cleanup(s); 1898 } 1899 1900 static void *dump_thread(void *data) 1901 { 1902 DumpState *s = (DumpState *)data; 1903 dump_process(s, NULL); 1904 return NULL; 1905 } 1906 1907 DumpQueryResult *qmp_query_dump(Error **errp) 1908 { 1909 DumpQueryResult *result = g_new(DumpQueryResult, 1); 1910 DumpState *state = &dump_state_global; 1911 result->status = qatomic_read(&state->status); 1912 /* make sure we are reading status and written_size in order */ 1913 smp_rmb(); 1914 result->completed = state->written_size; 1915 result->total = state->total_size; 1916 return result; 1917 } 1918 1919 void qmp_dump_guest_memory(bool paging, const char *file, 1920 bool has_detach, bool detach, 1921 bool has_begin, int64_t begin, bool has_length, 1922 int64_t length, bool has_format, 1923 DumpGuestMemoryFormat format, Error **errp) 1924 { 1925 const char *p; 1926 int fd = -1; 1927 DumpState *s; 1928 Error *local_err = NULL; 1929 bool detach_p = false; 1930 1931 if (runstate_check(RUN_STATE_INMIGRATE)) { 1932 error_setg(errp, "Dump not allowed during incoming migration."); 1933 return; 1934 } 1935 1936 /* if there is a dump in background, we should wait until the dump 1937 * finished */ 1938 if (dump_in_progress()) { 1939 error_setg(errp, "There is a dump in process, please wait."); 1940 return; 1941 } 1942 1943 /* 1944 * kdump-compressed format need the whole memory dumped, so paging or 1945 * filter is not supported here. 1946 */ 1947 if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && 1948 (paging || has_begin || has_length)) { 1949 error_setg(errp, "kdump-compressed format doesn't support paging or " 1950 "filter"); 1951 return; 1952 } 1953 if (has_begin && !has_length) { 1954 error_setg(errp, QERR_MISSING_PARAMETER, "length"); 1955 return; 1956 } 1957 if (!has_begin && has_length) { 1958 error_setg(errp, QERR_MISSING_PARAMETER, "begin"); 1959 return; 1960 } 1961 if (has_detach) { 1962 detach_p = detach; 1963 } 1964 1965 /* check whether lzo/snappy is supported */ 1966 #ifndef CONFIG_LZO 1967 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { 1968 error_setg(errp, "kdump-lzo is not available now"); 1969 return; 1970 } 1971 #endif 1972 1973 #ifndef CONFIG_SNAPPY 1974 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { 1975 error_setg(errp, "kdump-snappy is not available now"); 1976 return; 1977 } 1978 #endif 1979 1980 #ifndef TARGET_X86_64 1981 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { 1982 error_setg(errp, "Windows dump is only available for x86-64"); 1983 return; 1984 } 1985 #endif 1986 1987 #if !defined(WIN32) 1988 if (strstart(file, "fd:", &p)) { 1989 fd = monitor_get_fd(monitor_cur(), p, errp); 1990 if (fd == -1) { 1991 return; 1992 } 1993 } 1994 #endif 1995 1996 if (strstart(file, "file:", &p)) { 1997 fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); 1998 if (fd < 0) { 1999 error_setg_file_open(errp, errno, p); 2000 return; 2001 } 2002 } 2003 2004 if (fd == -1) { 2005 error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); 2006 return; 2007 } 2008 2009 s = &dump_state_global; 2010 dump_state_prepare(s); 2011 2012 dump_init(s, fd, has_format, format, paging, has_begin, 2013 begin, length, &local_err); 2014 if (local_err) { 2015 error_propagate(errp, local_err); 2016 qatomic_set(&s->status, DUMP_STATUS_FAILED); 2017 return; 2018 } 2019 2020 if (detach_p) { 2021 /* detached dump */ 2022 s->detached = true; 2023 qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, 2024 s, QEMU_THREAD_DETACHED); 2025 } else { 2026 /* sync dump */ 2027 dump_process(s, errp); 2028 } 2029 } 2030 2031 DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) 2032 { 2033 DumpGuestMemoryCapability *cap = 2034 g_malloc0(sizeof(DumpGuestMemoryCapability)); 2035 DumpGuestMemoryFormatList **tail = &cap->formats; 2036 2037 /* elf is always available */ 2038 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_ELF); 2039 2040 /* kdump-zlib is always available */ 2041 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB); 2042 2043 /* add new item if kdump-lzo is available */ 2044 #ifdef CONFIG_LZO 2045 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO); 2046 #endif 2047 2048 /* add new item if kdump-snappy is available */ 2049 #ifdef CONFIG_SNAPPY 2050 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY); 2051 #endif 2052 2053 /* Windows dump is available only if target is x86_64 */ 2054 #ifdef TARGET_X86_64 2055 QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_WIN_DMP); 2056 #endif 2057 2058 return cap; 2059 } 2060