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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-common.h"
15 #include "elf.h"
16 #include "cpu.h"
17 #include "cpu-all.h"
18 #include "hwaddr.h"
19 #include "monitor.h"
20 #include "kvm.h"
21 #include "dump.h"
22 #include "sysemu.h"
23 #include "memory_mapping.h"
24 #include "error.h"
25 #include "qmp-commands.h"
26 #include "gdbstub.h"
27
28 static uint16_t cpu_convert_to_target16(uint16_t val, int endian)
29 {
30 if (endian == ELFDATA2LSB) {
31 val = cpu_to_le16(val);
32 } else {
33 val = cpu_to_be16(val);
34 }
35
36 return val;
37 }
38
39 static uint32_t cpu_convert_to_target32(uint32_t val, int endian)
40 {
41 if (endian == ELFDATA2LSB) {
42 val = cpu_to_le32(val);
43 } else {
44 val = cpu_to_be32(val);
45 }
46
47 return val;
48 }
49
50 static uint64_t cpu_convert_to_target64(uint64_t val, int endian)
51 {
52 if (endian == ELFDATA2LSB) {
53 val = cpu_to_le64(val);
54 } else {
55 val = cpu_to_be64(val);
56 }
57
58 return val;
59 }
60
61 typedef struct DumpState {
62 ArchDumpInfo dump_info;
63 MemoryMappingList list;
64 uint16_t phdr_num;
65 uint32_t sh_info;
66 bool have_section;
67 bool resume;
68 size_t note_size;
69 hwaddr memory_offset;
70 int fd;
71
72 RAMBlock *block;
73 ram_addr_t start;
74 bool has_filter;
75 int64_t begin;
76 int64_t length;
77 Error **errp;
78 } DumpState;
79
80 static int dump_cleanup(DumpState *s)
81 {
82 int ret = 0;
83
84 memory_mapping_list_free(&s->list);
85 if (s->fd != -1) {
86 close(s->fd);
87 }
88 if (s->resume) {
89 vm_start();
90 }
91
92 return ret;
93 }
94
95 static void dump_error(DumpState *s, const char *reason)
96 {
97 dump_cleanup(s);
98 }
99
100 static int fd_write_vmcore(void *buf, size_t size, void *opaque)
101 {
102 DumpState *s = opaque;
103 size_t written_size;
104
105 written_size = qemu_write_full(s->fd, buf, size);
106 if (written_size != size) {
107 return -1;
108 }
109
110 return 0;
111 }
112
113 static int write_elf64_header(DumpState *s)
114 {
115 Elf64_Ehdr elf_header;
116 int ret;
117 int endian = s->dump_info.d_endian;
118
119 memset(&elf_header, 0, sizeof(Elf64_Ehdr));
120 memcpy(&elf_header, ELFMAG, SELFMAG);
121 elf_header.e_ident[EI_CLASS] = ELFCLASS64;
122 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
123 elf_header.e_ident[EI_VERSION] = EV_CURRENT;
124 elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
125 elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
126 endian);
127 elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
128 elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
129 elf_header.e_phoff = cpu_convert_to_target64(sizeof(Elf64_Ehdr), endian);
130 elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf64_Phdr),
131 endian);
132 elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
133 if (s->have_section) {
134 uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info;
135
136 elf_header.e_shoff = cpu_convert_to_target64(shoff, endian);
137 elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf64_Shdr),
138 endian);
139 elf_header.e_shnum = cpu_convert_to_target16(1, endian);
140 }
141
142 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
143 if (ret < 0) {
144 dump_error(s, "dump: failed to write elf header.\n");
145 return -1;
146 }
147
148 return 0;
149 }
150
151 static int write_elf32_header(DumpState *s)
152 {
153 Elf32_Ehdr elf_header;
154 int ret;
155 int endian = s->dump_info.d_endian;
156
157 memset(&elf_header, 0, sizeof(Elf32_Ehdr));
158 memcpy(&elf_header, ELFMAG, SELFMAG);
159 elf_header.e_ident[EI_CLASS] = ELFCLASS32;
160 elf_header.e_ident[EI_DATA] = endian;
161 elf_header.e_ident[EI_VERSION] = EV_CURRENT;
162 elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);
163 elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,
164 endian);
165 elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);
166 elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);
167 elf_header.e_phoff = cpu_convert_to_target32(sizeof(Elf32_Ehdr), endian);
168 elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf32_Phdr),
169 endian);
170 elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);
171 if (s->have_section) {
172 uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info;
173
174 elf_header.e_shoff = cpu_convert_to_target32(shoff, endian);
175 elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf32_Shdr),
176 endian);
177 elf_header.e_shnum = cpu_convert_to_target16(1, endian);
178 }
179
180 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
181 if (ret < 0) {
182 dump_error(s, "dump: failed to write elf header.\n");
183 return -1;
184 }
185
186 return 0;
187 }
188
189 static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping,
190 int phdr_index, hwaddr offset)
191 {
192 Elf64_Phdr phdr;
193 int ret;
194 int endian = s->dump_info.d_endian;
195
196 memset(&phdr, 0, sizeof(Elf64_Phdr));
197 phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
198 phdr.p_offset = cpu_convert_to_target64(offset, endian);
199 phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian);
200 if (offset == -1) {
201 /* When the memory is not stored into vmcore, offset will be -1 */
202 phdr.p_filesz = 0;
203 } else {
204 phdr.p_filesz = cpu_convert_to_target64(memory_mapping->length, endian);
205 }
206 phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian);
207 phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian);
208
209 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
210 if (ret < 0) {
211 dump_error(s, "dump: failed to write program header table.\n");
212 return -1;
213 }
214
215 return 0;
216 }
217
218 static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,
219 int phdr_index, hwaddr offset)
220 {
221 Elf32_Phdr phdr;
222 int ret;
223 int endian = s->dump_info.d_endian;
224
225 memset(&phdr, 0, sizeof(Elf32_Phdr));
226 phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);
227 phdr.p_offset = cpu_convert_to_target32(offset, endian);
228 phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian);
229 if (offset == -1) {
230 /* When the memory is not stored into vmcore, offset will be -1 */
231 phdr.p_filesz = 0;
232 } else {
233 phdr.p_filesz = cpu_convert_to_target32(memory_mapping->length, endian);
234 }
235 phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian);
236 phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian);
237
238 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
239 if (ret < 0) {
240 dump_error(s, "dump: failed to write program header table.\n");
241 return -1;
242 }
243
244 return 0;
245 }
246
247 static int write_elf64_note(DumpState *s)
248 {
249 Elf64_Phdr phdr;
250 int endian = s->dump_info.d_endian;
251 hwaddr begin = s->memory_offset - s->note_size;
252 int ret;
253
254 memset(&phdr, 0, sizeof(Elf64_Phdr));
255 phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
256 phdr.p_offset = cpu_convert_to_target64(begin, endian);
257 phdr.p_paddr = 0;
258 phdr.p_filesz = cpu_convert_to_target64(s->note_size, endian);
259 phdr.p_memsz = cpu_convert_to_target64(s->note_size, endian);
260 phdr.p_vaddr = 0;
261
262 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
263 if (ret < 0) {
264 dump_error(s, "dump: failed to write program header table.\n");
265 return -1;
266 }
267
268 return 0;
269 }
270
271 static int write_elf64_notes(DumpState *s)
272 {
273 CPUArchState *env;
274 int ret;
275 int id;
276
277 for (env = first_cpu; env != NULL; env = env->next_cpu) {
278 id = cpu_index(env);
279 ret = cpu_write_elf64_note(fd_write_vmcore, env, id, s);
280 if (ret < 0) {
281 dump_error(s, "dump: failed to write elf notes.\n");
282 return -1;
283 }
284 }
285
286 for (env = first_cpu; env != NULL; env = env->next_cpu) {
287 ret = cpu_write_elf64_qemunote(fd_write_vmcore, env, s);
288 if (ret < 0) {
289 dump_error(s, "dump: failed to write CPU status.\n");
290 return -1;
291 }
292 }
293
294 return 0;
295 }
296
297 static int write_elf32_note(DumpState *s)
298 {
299 hwaddr begin = s->memory_offset - s->note_size;
300 Elf32_Phdr phdr;
301 int endian = s->dump_info.d_endian;
302 int ret;
303
304 memset(&phdr, 0, sizeof(Elf32_Phdr));
305 phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);
306 phdr.p_offset = cpu_convert_to_target32(begin, endian);
307 phdr.p_paddr = 0;
308 phdr.p_filesz = cpu_convert_to_target32(s->note_size, endian);
309 phdr.p_memsz = cpu_convert_to_target32(s->note_size, endian);
310 phdr.p_vaddr = 0;
311
312 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
313 if (ret < 0) {
314 dump_error(s, "dump: failed to write program header table.\n");
315 return -1;
316 }
317
318 return 0;
319 }
320
321 static int write_elf32_notes(DumpState *s)
322 {
323 CPUArchState *env;
324 int ret;
325 int id;
326
327 for (env = first_cpu; env != NULL; env = env->next_cpu) {
328 id = cpu_index(env);
329 ret = cpu_write_elf32_note(fd_write_vmcore, env, id, s);
330 if (ret < 0) {
331 dump_error(s, "dump: failed to write elf notes.\n");
332 return -1;
333 }
334 }
335
336 for (env = first_cpu; env != NULL; env = env->next_cpu) {
337 ret = cpu_write_elf32_qemunote(fd_write_vmcore, env, s);
338 if (ret < 0) {
339 dump_error(s, "dump: failed to write CPU status.\n");
340 return -1;
341 }
342 }
343
344 return 0;
345 }
346
347 static int write_elf_section(DumpState *s, int type)
348 {
349 Elf32_Shdr shdr32;
350 Elf64_Shdr shdr64;
351 int endian = s->dump_info.d_endian;
352 int shdr_size;
353 void *shdr;
354 int ret;
355
356 if (type == 0) {
357 shdr_size = sizeof(Elf32_Shdr);
358 memset(&shdr32, 0, shdr_size);
359 shdr32.sh_info = cpu_convert_to_target32(s->sh_info, endian);
360 shdr = &shdr32;
361 } else {
362 shdr_size = sizeof(Elf64_Shdr);
363 memset(&shdr64, 0, shdr_size);
364 shdr64.sh_info = cpu_convert_to_target32(s->sh_info, endian);
365 shdr = &shdr64;
366 }
367
368 ret = fd_write_vmcore(&shdr, shdr_size, s);
369 if (ret < 0) {
370 dump_error(s, "dump: failed to write section header table.\n");
371 return -1;
372 }
373
374 return 0;
375 }
376
377 static int write_data(DumpState *s, void *buf, int length)
378 {
379 int ret;
380
381 ret = fd_write_vmcore(buf, length, s);
382 if (ret < 0) {
383 dump_error(s, "dump: failed to save memory.\n");
384 return -1;
385 }
386
387 return 0;
388 }
389
390 /* write the memroy to vmcore. 1 page per I/O. */
391 static int write_memory(DumpState *s, RAMBlock *block, ram_addr_t start,
392 int64_t size)
393 {
394 int64_t i;
395 int ret;
396
397 for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {
398 ret = write_data(s, block->host + start + i * TARGET_PAGE_SIZE,
399 TARGET_PAGE_SIZE);
400 if (ret < 0) {
401 return ret;
402 }
403 }
404
405 if ((size % TARGET_PAGE_SIZE) != 0) {
406 ret = write_data(s, block->host + start + i * TARGET_PAGE_SIZE,
407 size % TARGET_PAGE_SIZE);
408 if (ret < 0) {
409 return ret;
410 }
411 }
412
413 return 0;
414 }
415
416 /* get the memory's offset in the vmcore */
417 static hwaddr get_offset(hwaddr phys_addr,
418 DumpState *s)
419 {
420 RAMBlock *block;
421 hwaddr offset = s->memory_offset;
422 int64_t size_in_block, start;
423
424 if (s->has_filter) {
425 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
426 return -1;
427 }
428 }
429
430 QLIST_FOREACH(block, &ram_list.blocks, next) {
431 if (s->has_filter) {
432 if (block->offset >= s->begin + s->length ||
433 block->offset + block->length <= s->begin) {
434 /* This block is out of the range */
435 continue;
436 }
437
438 if (s->begin <= block->offset) {
439 start = block->offset;
440 } else {
441 start = s->begin;
442 }
443
444 size_in_block = block->length - (start - block->offset);
445 if (s->begin + s->length < block->offset + block->length) {
446 size_in_block -= block->offset + block->length -
447 (s->begin + s->length);
448 }
449 } else {
450 start = block->offset;
451 size_in_block = block->length;
452 }
453
454 if (phys_addr >= start && phys_addr < start + size_in_block) {
455 return phys_addr - start + offset;
456 }
457
458 offset += size_in_block;
459 }
460
461 return -1;
462 }
463
464 static int write_elf_loads(DumpState *s)
465 {
466 hwaddr offset;
467 MemoryMapping *memory_mapping;
468 uint32_t phdr_index = 1;
469 int ret;
470 uint32_t max_index;
471
472 if (s->have_section) {
473 max_index = s->sh_info;
474 } else {
475 max_index = s->phdr_num;
476 }
477
478 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {
479 offset = get_offset(memory_mapping->phys_addr, s);
480 if (s->dump_info.d_class == ELFCLASS64) {
481 ret = write_elf64_load(s, memory_mapping, phdr_index++, offset);
482 } else {
483 ret = write_elf32_load(s, memory_mapping, phdr_index++, offset);
484 }
485
486 if (ret < 0) {
487 return -1;
488 }
489
490 if (phdr_index >= max_index) {
491 break;
492 }
493 }
494
495 return 0;
496 }
497
498 /* write elf header, PT_NOTE and elf note to vmcore. */
499 static int dump_begin(DumpState *s)
500 {
501 int ret;
502
503 /*
504 * the vmcore's format is:
505 * --------------
506 * | elf header |
507 * --------------
508 * | PT_NOTE |
509 * --------------
510 * | PT_LOAD |
511 * --------------
512 * | ...... |
513 * --------------
514 * | PT_LOAD |
515 * --------------
516 * | sec_hdr |
517 * --------------
518 * | elf note |
519 * --------------
520 * | memory |
521 * --------------
522 *
523 * we only know where the memory is saved after we write elf note into
524 * vmcore.
525 */
526
527 /* write elf header to vmcore */
528 if (s->dump_info.d_class == ELFCLASS64) {
529 ret = write_elf64_header(s);
530 } else {
531 ret = write_elf32_header(s);
532 }
533 if (ret < 0) {
534 return -1;
535 }
536
537 if (s->dump_info.d_class == ELFCLASS64) {
538 /* write PT_NOTE to vmcore */
539 if (write_elf64_note(s) < 0) {
540 return -1;
541 }
542
543 /* write all PT_LOAD to vmcore */
544 if (write_elf_loads(s) < 0) {
545 return -1;
546 }
547
548 /* write section to vmcore */
549 if (s->have_section) {
550 if (write_elf_section(s, 1) < 0) {
551 return -1;
552 }
553 }
554
555 /* write notes to vmcore */
556 if (write_elf64_notes(s) < 0) {
557 return -1;
558 }
559
560 } else {
561 /* write PT_NOTE to vmcore */
562 if (write_elf32_note(s) < 0) {
563 return -1;
564 }
565
566 /* write all PT_LOAD to vmcore */
567 if (write_elf_loads(s) < 0) {
568 return -1;
569 }
570
571 /* write section to vmcore */
572 if (s->have_section) {
573 if (write_elf_section(s, 0) < 0) {
574 return -1;
575 }
576 }
577
578 /* write notes to vmcore */
579 if (write_elf32_notes(s) < 0) {
580 return -1;
581 }
582 }
583
584 return 0;
585 }
586
587 /* write PT_LOAD to vmcore */
588 static int dump_completed(DumpState *s)
589 {
590 dump_cleanup(s);
591 return 0;
592 }
593
594 static int get_next_block(DumpState *s, RAMBlock *block)
595 {
596 while (1) {
597 block = QLIST_NEXT(block, next);
598 if (!block) {
599 /* no more block */
600 return 1;
601 }
602
603 s->start = 0;
604 s->block = block;
605 if (s->has_filter) {
606 if (block->offset >= s->begin + s->length ||
607 block->offset + block->length <= s->begin) {
608 /* This block is out of the range */
609 continue;
610 }
611
612 if (s->begin > block->offset) {
613 s->start = s->begin - block->offset;
614 }
615 }
616
617 return 0;
618 }
619 }
620
621 /* write all memory to vmcore */
622 static int dump_iterate(DumpState *s)
623 {
624 RAMBlock *block;
625 int64_t size;
626 int ret;
627
628 while (1) {
629 block = s->block;
630
631 size = block->length;
632 if (s->has_filter) {
633 size -= s->start;
634 if (s->begin + s->length < block->offset + block->length) {
635 size -= block->offset + block->length - (s->begin + s->length);
636 }
637 }
638 ret = write_memory(s, block, s->start, size);
639 if (ret == -1) {
640 return ret;
641 }
642
643 ret = get_next_block(s, block);
644 if (ret == 1) {
645 dump_completed(s);
646 return 0;
647 }
648 }
649 }
650
651 static int create_vmcore(DumpState *s)
652 {
653 int ret;
654
655 ret = dump_begin(s);
656 if (ret < 0) {
657 return -1;
658 }
659
660 ret = dump_iterate(s);
661 if (ret < 0) {
662 return -1;
663 }
664
665 return 0;
666 }
667
668 static ram_addr_t get_start_block(DumpState *s)
669 {
670 RAMBlock *block;
671
672 if (!s->has_filter) {
673 s->block = QLIST_FIRST(&ram_list.blocks);
674 return 0;
675 }
676
677 QLIST_FOREACH(block, &ram_list.blocks, next) {
678 if (block->offset >= s->begin + s->length ||
679 block->offset + block->length <= s->begin) {
680 /* This block is out of the range */
681 continue;
682 }
683
684 s->block = block;
685 if (s->begin > block->offset) {
686 s->start = s->begin - block->offset;
687 } else {
688 s->start = 0;
689 }
690 return s->start;
691 }
692
693 return -1;
694 }
695
696 static int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
697 int64_t begin, int64_t length, Error **errp)
698 {
699 CPUArchState *env;
700 int nr_cpus;
701 int ret;
702
703 if (runstate_is_running()) {
704 vm_stop(RUN_STATE_SAVE_VM);
705 s->resume = true;
706 } else {
707 s->resume = false;
708 }
709
710 s->errp = errp;
711 s->fd = fd;
712 s->has_filter = has_filter;
713 s->begin = begin;
714 s->length = length;
715 s->start = get_start_block(s);
716 if (s->start == -1) {
717 error_set(errp, QERR_INVALID_PARAMETER, "begin");
718 goto cleanup;
719 }
720
721 /*
722 * get dump info: endian, class and architecture.
723 * If the target architecture is not supported, cpu_get_dump_info() will
724 * return -1.
725 *
726 * if we use kvm, we should synchronize the register before we get dump
727 * info.
728 */
729 nr_cpus = 0;
730 for (env = first_cpu; env != NULL; env = env->next_cpu) {
731 cpu_synchronize_state(env);
732 nr_cpus++;
733 }
734
735 ret = cpu_get_dump_info(&s->dump_info);
736 if (ret < 0) {
737 error_set(errp, QERR_UNSUPPORTED);
738 goto cleanup;
739 }
740
741 s->note_size = cpu_get_note_size(s->dump_info.d_class,
742 s->dump_info.d_machine, nr_cpus);
743 if (ret < 0) {
744 error_set(errp, QERR_UNSUPPORTED);
745 goto cleanup;
746 }
747
748 /* get memory mapping */
749 memory_mapping_list_init(&s->list);
750 if (paging) {
751 qemu_get_guest_memory_mapping(&s->list);
752 } else {
753 qemu_get_guest_simple_memory_mapping(&s->list);
754 }
755
756 if (s->has_filter) {
757 memory_mapping_filter(&s->list, s->begin, s->length);
758 }
759
760 /*
761 * calculate phdr_num
762 *
763 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow
764 */
765 s->phdr_num = 1; /* PT_NOTE */
766 if (s->list.num < UINT16_MAX - 2) {
767 s->phdr_num += s->list.num;
768 s->have_section = false;
769 } else {
770 s->have_section = true;
771 s->phdr_num = PN_XNUM;
772 s->sh_info = 1; /* PT_NOTE */
773
774 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */
775 if (s->list.num <= UINT32_MAX - 1) {
776 s->sh_info += s->list.num;
777 } else {
778 s->sh_info = UINT32_MAX;
779 }
780 }
781
782 if (s->dump_info.d_class == ELFCLASS64) {
783 if (s->have_section) {
784 s->memory_offset = sizeof(Elf64_Ehdr) +
785 sizeof(Elf64_Phdr) * s->sh_info +
786 sizeof(Elf64_Shdr) + s->note_size;
787 } else {
788 s->memory_offset = sizeof(Elf64_Ehdr) +
789 sizeof(Elf64_Phdr) * s->phdr_num + s->note_size;
790 }
791 } else {
792 if (s->have_section) {
793 s->memory_offset = sizeof(Elf32_Ehdr) +
794 sizeof(Elf32_Phdr) * s->sh_info +
795 sizeof(Elf32_Shdr) + s->note_size;
796 } else {
797 s->memory_offset = sizeof(Elf32_Ehdr) +
798 sizeof(Elf32_Phdr) * s->phdr_num + s->note_size;
799 }
800 }
801
802 return 0;
803
804 cleanup:
805 if (s->resume) {
806 vm_start();
807 }
808
809 return -1;
810 }
811
812 void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,
813 int64_t begin, bool has_length, int64_t length,
814 Error **errp)
815 {
816 const char *p;
817 int fd = -1;
818 DumpState *s;
819 int ret;
820
821 if (has_begin && !has_length) {
822 error_set(errp, QERR_MISSING_PARAMETER, "length");
823 return;
824 }
825 if (!has_begin && has_length) {
826 error_set(errp, QERR_MISSING_PARAMETER, "begin");
827 return;
828 }
829
830 #if !defined(WIN32)
831 if (strstart(file, "fd:", &p)) {
832 fd = monitor_get_fd(cur_mon, p, errp);
833 if (fd == -1) {
834 return;
835 }
836 }
837 #endif
838
839 if (strstart(file, "file:", &p)) {
840 fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR);
841 if (fd < 0) {
842 error_set(errp, QERR_OPEN_FILE_FAILED, p);
843 return;
844 }
845 }
846
847 if (fd == -1) {
848 error_set(errp, QERR_INVALID_PARAMETER, "protocol");
849 return;
850 }
851
852 s = g_malloc(sizeof(DumpState));
853
854 ret = dump_init(s, fd, paging, has_begin, begin, length, errp);
855 if (ret < 0) {
856 g_free(s);
857 return;
858 }
859
860 if (create_vmcore(s) < 0 && !error_is_set(s->errp)) {
861 error_set(errp, QERR_IO_ERROR);
862 }
863
864 g_free(s);
865 }