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Merge remote-tracking branch 'remotes/rth/tcg-ppc-merge-1' into staging
[qemu/kevin.git] / dump.c
blobce646bcc5159b2c0b9b54ff8740c1c9aaa68bf26
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 "exec/cpu-all.h"
18 #include "exec/hwaddr.h"
19 #include "monitor/monitor.h"
20 #include "sysemu/kvm.h"
21 #include "sysemu/dump.h"
22 #include "sysemu/sysemu.h"
23 #include "sysemu/memory_mapping.h"
24 #include "sysemu/cpus.h"
25 #include "qapi/error.h"
26 #include "qmp-commands.h"
27
28 #include <zlib.h>
29 #ifdef CONFIG_LZO
30 #include <lzo/lzo1x.h>
31 #endif
32 #ifdef CONFIG_SNAPPY
33 #include <snappy-c.h>
34 #endif
35 #ifndef ELF_MACHINE_UNAME
36 #define ELF_MACHINE_UNAME "Unknown"
37 #endif
38
39 uint16_t cpu_to_dump16(DumpState *s, uint16_t val)
40 {
41 if (s->dump_info.d_endian == ELFDATA2LSB) {
42 val = cpu_to_le16(val);
43 } else {
44 val = cpu_to_be16(val);
45 }
46
47 return val;
48 }
49
50 uint32_t cpu_to_dump32(DumpState *s, uint32_t val)
51 {
52 if (s->dump_info.d_endian == ELFDATA2LSB) {
53 val = cpu_to_le32(val);
54 } else {
55 val = cpu_to_be32(val);
56 }
57
58 return val;
59 }
60
61 uint64_t cpu_to_dump64(DumpState *s, uint64_t val)
62 {
63 if (s->dump_info.d_endian == ELFDATA2LSB) {
64 val = cpu_to_le64(val);
65 } else {
66 val = cpu_to_be64(val);
67 }
68
69 return val;
70 }
71
72 static int dump_cleanup(DumpState *s)
73 {
74 int ret = 0;
75
76 guest_phys_blocks_free(&s->guest_phys_blocks);
77 memory_mapping_list_free(&s->list);
78 if (s->fd != -1) {
79 close(s->fd);
80 }
81 if (s->resume) {
82 vm_start();
83 }
84
85 return ret;
86 }
87
88 static void dump_error(DumpState *s, const char *reason)
89 {
90 dump_cleanup(s);
91 }
92
93 static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
94 {
95 DumpState *s = opaque;
96 size_t written_size;
97
98 written_size = qemu_write_full(s->fd, buf, size);
99 if (written_size != size) {
100 return -1;
101 }
102
103 return 0;
104 }
105
106 static int write_elf64_header(DumpState *s)
107 {
108 Elf64_Ehdr elf_header;
109 int ret;
110
111 memset(&elf_header, 0, sizeof(Elf64_Ehdr));
112 memcpy(&elf_header, ELFMAG, SELFMAG);
113 elf_header.e_ident[EI_CLASS] = ELFCLASS64;
114 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
115 elf_header.e_ident[EI_VERSION] = EV_CURRENT;
116 elf_header.e_type = cpu_to_dump16(s, ET_CORE);
117 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
118 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
119 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
120 elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr));
121 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
122 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num);
123 if (s->have_section) {
124 uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info;
125
126 elf_header.e_shoff = cpu_to_dump64(s, shoff);
127 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
128 elf_header.e_shnum = cpu_to_dump16(s, 1);
129 }
130
131 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
132 if (ret < 0) {
133 dump_error(s, "dump: failed to write elf header.\n");
134 return -1;
135 }
136
137 return 0;
138 }
139
140 static int write_elf32_header(DumpState *s)
141 {
142 Elf32_Ehdr elf_header;
143 int ret;
144
145 memset(&elf_header, 0, sizeof(Elf32_Ehdr));
146 memcpy(&elf_header, ELFMAG, SELFMAG);
147 elf_header.e_ident[EI_CLASS] = ELFCLASS32;
148 elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
149 elf_header.e_ident[EI_VERSION] = EV_CURRENT;
150 elf_header.e_type = cpu_to_dump16(s, ET_CORE);
151 elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
152 elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
153 elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
154 elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr));
155 elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
156 elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num);
157 if (s->have_section) {
158 uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info;
159
160 elf_header.e_shoff = cpu_to_dump32(s, shoff);
161 elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
162 elf_header.e_shnum = cpu_to_dump16(s, 1);
163 }
164
165 ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
166 if (ret < 0) {
167 dump_error(s, "dump: failed to write elf header.\n");
168 return -1;
169 }
170
171 return 0;
172 }
173
174 static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping,
175 int phdr_index, hwaddr offset,
176 hwaddr filesz)
177 {
178 Elf64_Phdr phdr;
179 int ret;
180
181 memset(&phdr, 0, sizeof(Elf64_Phdr));
182 phdr.p_type = cpu_to_dump32(s, PT_LOAD);
183 phdr.p_offset = cpu_to_dump64(s, offset);
184 phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr);
185 phdr.p_filesz = cpu_to_dump64(s, filesz);
186 phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length);
187 phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr);
188
189 assert(memory_mapping->length >= filesz);
190
191 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
192 if (ret < 0) {
193 dump_error(s, "dump: failed to write program header table.\n");
194 return -1;
195 }
196
197 return 0;
198 }
199
200 static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,
201 int phdr_index, hwaddr offset,
202 hwaddr filesz)
203 {
204 Elf32_Phdr phdr;
205 int ret;
206
207 memset(&phdr, 0, sizeof(Elf32_Phdr));
208 phdr.p_type = cpu_to_dump32(s, PT_LOAD);
209 phdr.p_offset = cpu_to_dump32(s, offset);
210 phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr);
211 phdr.p_filesz = cpu_to_dump32(s, filesz);
212 phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length);
213 phdr.p_vaddr = cpu_to_dump32(s, memory_mapping->virt_addr);
214
215 assert(memory_mapping->length >= filesz);
216
217 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
218 if (ret < 0) {
219 dump_error(s, "dump: failed to write program header table.\n");
220 return -1;
221 }
222
223 return 0;
224 }
225
226 static int write_elf64_note(DumpState *s)
227 {
228 Elf64_Phdr phdr;
229 hwaddr begin = s->memory_offset - s->note_size;
230 int ret;
231
232 memset(&phdr, 0, sizeof(Elf64_Phdr));
233 phdr.p_type = cpu_to_dump32(s, PT_NOTE);
234 phdr.p_offset = cpu_to_dump64(s, begin);
235 phdr.p_paddr = 0;
236 phdr.p_filesz = cpu_to_dump64(s, s->note_size);
237 phdr.p_memsz = cpu_to_dump64(s, s->note_size);
238 phdr.p_vaddr = 0;
239
240 ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);
241 if (ret < 0) {
242 dump_error(s, "dump: failed to write program header table.\n");
243 return -1;
244 }
245
246 return 0;
247 }
248
249 static inline int cpu_index(CPUState *cpu)
250 {
251 return cpu->cpu_index + 1;
252 }
253
254 static int write_elf64_notes(WriteCoreDumpFunction f, DumpState *s)
255 {
256 CPUState *cpu;
257 int ret;
258 int id;
259
260 CPU_FOREACH(cpu) {
261 id = cpu_index(cpu);
262 ret = cpu_write_elf64_note(f, cpu, id, s);
263 if (ret < 0) {
264 dump_error(s, "dump: failed to write elf notes.\n");
265 return -1;
266 }
267 }
268
269 CPU_FOREACH(cpu) {
270 ret = cpu_write_elf64_qemunote(f, cpu, s);
271 if (ret < 0) {
272 dump_error(s, "dump: failed to write CPU status.\n");
273 return -1;
274 }
275 }
276
277 return 0;
278 }
279
280 static int write_elf32_note(DumpState *s)
281 {
282 hwaddr begin = s->memory_offset - s->note_size;
283 Elf32_Phdr phdr;
284 int ret;
285
286 memset(&phdr, 0, sizeof(Elf32_Phdr));
287 phdr.p_type = cpu_to_dump32(s, PT_NOTE);
288 phdr.p_offset = cpu_to_dump32(s, begin);
289 phdr.p_paddr = 0;
290 phdr.p_filesz = cpu_to_dump32(s, s->note_size);
291 phdr.p_memsz = cpu_to_dump32(s, s->note_size);
292 phdr.p_vaddr = 0;
293
294 ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);
295 if (ret < 0) {
296 dump_error(s, "dump: failed to write program header table.\n");
297 return -1;
298 }
299
300 return 0;
301 }
302
303 static int write_elf32_notes(WriteCoreDumpFunction f, DumpState *s)
304 {
305 CPUState *cpu;
306 int ret;
307 int id;
308
309 CPU_FOREACH(cpu) {
310 id = cpu_index(cpu);
311 ret = cpu_write_elf32_note(f, cpu, id, s);
312 if (ret < 0) {
313 dump_error(s, "dump: failed to write elf notes.\n");
314 return -1;
315 }
316 }
317
318 CPU_FOREACH(cpu) {
319 ret = cpu_write_elf32_qemunote(f, cpu, s);
320 if (ret < 0) {
321 dump_error(s, "dump: failed to write CPU status.\n");
322 return -1;
323 }
324 }
325
326 return 0;
327 }
328
329 static int write_elf_section(DumpState *s, int type)
330 {
331 Elf32_Shdr shdr32;
332 Elf64_Shdr shdr64;
333 int shdr_size;
334 void *shdr;
335 int ret;
336
337 if (type == 0) {
338 shdr_size = sizeof(Elf32_Shdr);
339 memset(&shdr32, 0, shdr_size);
340 shdr32.sh_info = cpu_to_dump32(s, s->sh_info);
341 shdr = &shdr32;
342 } else {
343 shdr_size = sizeof(Elf64_Shdr);
344 memset(&shdr64, 0, shdr_size);
345 shdr64.sh_info = cpu_to_dump32(s, s->sh_info);
346 shdr = &shdr64;
347 }
348
349 ret = fd_write_vmcore(&shdr, shdr_size, s);
350 if (ret < 0) {
351 dump_error(s, "dump: failed to write section header table.\n");
352 return -1;
353 }
354
355 return 0;
356 }
357
358 static int write_data(DumpState *s, void *buf, int length)
359 {
360 int ret;
361
362 ret = fd_write_vmcore(buf, length, s);
363 if (ret < 0) {
364 dump_error(s, "dump: failed to save memory.\n");
365 return -1;
366 }
367
368 return 0;
369 }
370
371 /* write the memroy to vmcore. 1 page per I/O. */
372 static int write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start,
373 int64_t size)
374 {
375 int64_t i;
376 int ret;
377
378 for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {
379 ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
380 TARGET_PAGE_SIZE);
381 if (ret < 0) {
382 return ret;
383 }
384 }
385
386 if ((size % TARGET_PAGE_SIZE) != 0) {
387 ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,
388 size % TARGET_PAGE_SIZE);
389 if (ret < 0) {
390 return ret;
391 }
392 }
393
394 return 0;
395 }
396
397 /* get the memory's offset and size in the vmcore */
398 static void get_offset_range(hwaddr phys_addr,
399 ram_addr_t mapping_length,
400 DumpState *s,
401 hwaddr *p_offset,
402 hwaddr *p_filesz)
403 {
404 GuestPhysBlock *block;
405 hwaddr offset = s->memory_offset;
406 int64_t size_in_block, start;
407
408 /* When the memory is not stored into vmcore, offset will be -1 */
409 *p_offset = -1;
410 *p_filesz = 0;
411
412 if (s->has_filter) {
413 if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {
414 return;
415 }
416 }
417
418 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
419 if (s->has_filter) {
420 if (block->target_start >= s->begin + s->length ||
421 block->target_end <= s->begin) {
422 /* This block is out of the range */
423 continue;
424 }
425
426 if (s->begin <= block->target_start) {
427 start = block->target_start;
428 } else {
429 start = s->begin;
430 }
431
432 size_in_block = block->target_end - start;
433 if (s->begin + s->length < block->target_end) {
434 size_in_block -= block->target_end - (s->begin + s->length);
435 }
436 } else {
437 start = block->target_start;
438 size_in_block = block->target_end - block->target_start;
439 }
440
441 if (phys_addr >= start && phys_addr < start + size_in_block) {
442 *p_offset = phys_addr - start + offset;
443
444 /* The offset range mapped from the vmcore file must not spill over
445 * the GuestPhysBlock, clamp it. The rest of the mapping will be
446 * zero-filled in memory at load time; see
447 * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>.
448 */
449 *p_filesz = phys_addr + mapping_length <= start + size_in_block ?
450 mapping_length :
451 size_in_block - (phys_addr - start);
452 return;
453 }
454
455 offset += size_in_block;
456 }
457 }
458
459 static int write_elf_loads(DumpState *s)
460 {
461 hwaddr offset, filesz;
462 MemoryMapping *memory_mapping;
463 uint32_t phdr_index = 1;
464 int ret;
465 uint32_t max_index;
466
467 if (s->have_section) {
468 max_index = s->sh_info;
469 } else {
470 max_index = s->phdr_num;
471 }
472
473 QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {
474 get_offset_range(memory_mapping->phys_addr,
475 memory_mapping->length,
476 s, &offset, &filesz);
477 if (s->dump_info.d_class == ELFCLASS64) {
478 ret = write_elf64_load(s, memory_mapping, phdr_index++, offset,
479 filesz);
480 } else {
481 ret = write_elf32_load(s, memory_mapping, phdr_index++, offset,
482 filesz);
483 }
484
485 if (ret < 0) {
486 return -1;
487 }
488
489 if (phdr_index >= max_index) {
490 break;
491 }
492 }
493
494 return 0;
495 }
496
497 /* write elf header, PT_NOTE and elf note to vmcore. */
498 static int dump_begin(DumpState *s)
499 {
500 int ret;
501
502 /*
503 * the vmcore's format is:
504 * --------------
505 * | elf header |
506 * --------------
507 * | PT_NOTE |
508 * --------------
509 * | PT_LOAD |
510 * --------------
511 * | ...... |
512 * --------------
513 * | PT_LOAD |
514 * --------------
515 * | sec_hdr |
516 * --------------
517 * | elf note |
518 * --------------
519 * | memory |
520 * --------------
521 *
522 * we only know where the memory is saved after we write elf note into
523 * vmcore.
524 */
525
526 /* write elf header to vmcore */
527 if (s->dump_info.d_class == ELFCLASS64) {
528 ret = write_elf64_header(s);
529 } else {
530 ret = write_elf32_header(s);
531 }
532 if (ret < 0) {
533 return -1;
534 }
535
536 if (s->dump_info.d_class == ELFCLASS64) {
537 /* write PT_NOTE to vmcore */
538 if (write_elf64_note(s) < 0) {
539 return -1;
540 }
541
542 /* write all PT_LOAD to vmcore */
543 if (write_elf_loads(s) < 0) {
544 return -1;
545 }
546
547 /* write section to vmcore */
548 if (s->have_section) {
549 if (write_elf_section(s, 1) < 0) {
550 return -1;
551 }
552 }
553
554 /* write notes to vmcore */
555 if (write_elf64_notes(fd_write_vmcore, s) < 0) {
556 return -1;
557 }
558
559 } else {
560 /* write PT_NOTE to vmcore */
561 if (write_elf32_note(s) < 0) {
562 return -1;
563 }
564
565 /* write all PT_LOAD to vmcore */
566 if (write_elf_loads(s) < 0) {
567 return -1;
568 }
569
570 /* write section to vmcore */
571 if (s->have_section) {
572 if (write_elf_section(s, 0) < 0) {
573 return -1;
574 }
575 }
576
577 /* write notes to vmcore */
578 if (write_elf32_notes(fd_write_vmcore, s) < 0) {
579 return -1;
580 }
581 }
582
583 return 0;
584 }
585
586 /* write PT_LOAD to vmcore */
587 static int dump_completed(DumpState *s)
588 {
589 dump_cleanup(s);
590 return 0;
591 }
592
593 static int get_next_block(DumpState *s, GuestPhysBlock *block)
594 {
595 while (1) {
596 block = QTAILQ_NEXT(block, next);
597 if (!block) {
598 /* no more block */
599 return 1;
600 }
601
602 s->start = 0;
603 s->next_block = block;
604 if (s->has_filter) {
605 if (block->target_start >= s->begin + s->length ||
606 block->target_end <= s->begin) {
607 /* This block is out of the range */
608 continue;
609 }
610
611 if (s->begin > block->target_start) {
612 s->start = s->begin - block->target_start;
613 }
614 }
615
616 return 0;
617 }
618 }
619
620 /* write all memory to vmcore */
621 static int dump_iterate(DumpState *s)
622 {
623 GuestPhysBlock *block;
624 int64_t size;
625 int ret;
626
627 while (1) {
628 block = s->next_block;
629
630 size = block->target_end - block->target_start;
631 if (s->has_filter) {
632 size -= s->start;
633 if (s->begin + s->length < block->target_end) {
634 size -= block->target_end - (s->begin + s->length);
635 }
636 }
637 ret = write_memory(s, block, s->start, size);
638 if (ret == -1) {
639 return ret;
640 }
641
642 ret = get_next_block(s, block);
643 if (ret == 1) {
644 dump_completed(s);
645 return 0;
646 }
647 }
648 }
649
650 static int create_vmcore(DumpState *s)
651 {
652 int ret;
653
654 ret = dump_begin(s);
655 if (ret < 0) {
656 return -1;
657 }
658
659 ret = dump_iterate(s);
660 if (ret < 0) {
661 return -1;
662 }
663
664 return 0;
665 }
666
667 static int write_start_flat_header(int fd)
668 {
669 MakedumpfileHeader *mh;
670 int ret = 0;
671
672 QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER);
673 mh = g_malloc0(MAX_SIZE_MDF_HEADER);
674
675 memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE,
676 MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE));
677
678 mh->type = cpu_to_be64(TYPE_FLAT_HEADER);
679 mh->version = cpu_to_be64(VERSION_FLAT_HEADER);
680
681 size_t written_size;
682 written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER);
683 if (written_size != MAX_SIZE_MDF_HEADER) {
684 ret = -1;
685 }
686
687 g_free(mh);
688 return ret;
689 }
690
691 static int write_end_flat_header(int fd)
692 {
693 MakedumpfileDataHeader mdh;
694
695 mdh.offset = END_FLAG_FLAT_HEADER;
696 mdh.buf_size = END_FLAG_FLAT_HEADER;
697
698 size_t written_size;
699 written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
700 if (written_size != sizeof(mdh)) {
701 return -1;
702 }
703
704 return 0;
705 }
706
707 static int write_buffer(int fd, off_t offset, const void *buf, size_t size)
708 {
709 size_t written_size;
710 MakedumpfileDataHeader mdh;
711
712 mdh.offset = cpu_to_be64(offset);
713 mdh.buf_size = cpu_to_be64(size);
714
715 written_size = qemu_write_full(fd, &mdh, sizeof(mdh));
716 if (written_size != sizeof(mdh)) {
717 return -1;
718 }
719
720 written_size = qemu_write_full(fd, buf, size);
721 if (written_size != size) {
722 return -1;
723 }
724
725 return 0;
726 }
727
728 static int buf_write_note(const void *buf, size_t size, void *opaque)
729 {
730 DumpState *s = opaque;
731
732 /* note_buf is not enough */
733 if (s->note_buf_offset + size > s->note_size) {
734 return -1;
735 }
736
737 memcpy(s->note_buf + s->note_buf_offset, buf, size);
738
739 s->note_buf_offset += size;
740
741 return 0;
742 }
743
744 /* write common header, sub header and elf note to vmcore */
745 static int create_header32(DumpState *s)
746 {
747 int ret = 0;
748 DiskDumpHeader32 *dh = NULL;
749 KdumpSubHeader32 *kh = NULL;
750 size_t size;
751 uint32_t block_size;
752 uint32_t sub_hdr_size;
753 uint32_t bitmap_blocks;
754 uint32_t status = 0;
755 uint64_t offset_note;
756
757 /* write common header, the version of kdump-compressed format is 6th */
758 size = sizeof(DiskDumpHeader32);
759 dh = g_malloc0(size);
760
761 strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
762 dh->header_version = cpu_to_dump32(s, 6);
763 block_size = TARGET_PAGE_SIZE;
764 dh->block_size = cpu_to_dump32(s, block_size);
765 sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;
766 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
767 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size);
768 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
769 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX));
770 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus);
771 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
772 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks);
773 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
774
775 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
776 status |= DUMP_DH_COMPRESSED_ZLIB;
777 }
778 #ifdef CONFIG_LZO
779 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
780 status |= DUMP_DH_COMPRESSED_LZO;
781 }
782 #endif
783 #ifdef CONFIG_SNAPPY
784 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
785 status |= DUMP_DH_COMPRESSED_SNAPPY;
786 }
787 #endif
788 dh->status = cpu_to_dump32(s, status);
789
790 if (write_buffer(s->fd, 0, dh, size) < 0) {
791 dump_error(s, "dump: failed to write disk dump header.\n");
792 ret = -1;
793 goto out;
794 }
795
796 /* write sub header */
797 size = sizeof(KdumpSubHeader32);
798 kh = g_malloc0(size);
799
800 /* 64bit max_mapnr_64 */
801 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr);
802 kh->phys_base = cpu_to_dump32(s, PHYS_BASE);
803 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
804
805 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
806 kh->offset_note = cpu_to_dump64(s, offset_note);
807 kh->note_size = cpu_to_dump32(s, s->note_size);
808
809 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
810 block_size, kh, size) < 0) {
811 dump_error(s, "dump: failed to write kdump sub header.\n");
812 ret = -1;
813 goto out;
814 }
815
816 /* write note */
817 s->note_buf = g_malloc0(s->note_size);
818 s->note_buf_offset = 0;
819
820 /* use s->note_buf to store notes temporarily */
821 if (write_elf32_notes(buf_write_note, s) < 0) {
822 ret = -1;
823 goto out;
824 }
825
826 if (write_buffer(s->fd, offset_note, s->note_buf,
827 s->note_size) < 0) {
828 dump_error(s, "dump: failed to write notes");
829 ret = -1;
830 goto out;
831 }
832
833 /* get offset of dump_bitmap */
834 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
835 block_size;
836
837 /* get offset of page */
838 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
839 block_size;
840
841 out:
842 g_free(dh);
843 g_free(kh);
844 g_free(s->note_buf);
845
846 return ret;
847 }
848
849 /* write common header, sub header and elf note to vmcore */
850 static int create_header64(DumpState *s)
851 {
852 int ret = 0;
853 DiskDumpHeader64 *dh = NULL;
854 KdumpSubHeader64 *kh = NULL;
855 size_t size;
856 uint32_t block_size;
857 uint32_t sub_hdr_size;
858 uint32_t bitmap_blocks;
859 uint32_t status = 0;
860 uint64_t offset_note;
861
862 /* write common header, the version of kdump-compressed format is 6th */
863 size = sizeof(DiskDumpHeader64);
864 dh = g_malloc0(size);
865
866 strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));
867 dh->header_version = cpu_to_dump32(s, 6);
868 block_size = TARGET_PAGE_SIZE;
869 dh->block_size = cpu_to_dump32(s, block_size);
870 sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size;
871 sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);
872 dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size);
873 /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */
874 dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX));
875 dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus);
876 bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;
877 dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks);
878 strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));
879
880 if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {
881 status |= DUMP_DH_COMPRESSED_ZLIB;
882 }
883 #ifdef CONFIG_LZO
884 if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {
885 status |= DUMP_DH_COMPRESSED_LZO;
886 }
887 #endif
888 #ifdef CONFIG_SNAPPY
889 if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {
890 status |= DUMP_DH_COMPRESSED_SNAPPY;
891 }
892 #endif
893 dh->status = cpu_to_dump32(s, status);
894
895 if (write_buffer(s->fd, 0, dh, size) < 0) {
896 dump_error(s, "dump: failed to write disk dump header.\n");
897 ret = -1;
898 goto out;
899 }
900
901 /* write sub header */
902 size = sizeof(KdumpSubHeader64);
903 kh = g_malloc0(size);
904
905 /* 64bit max_mapnr_64 */
906 kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr);
907 kh->phys_base = cpu_to_dump64(s, PHYS_BASE);
908 kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL);
909
910 offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;
911 kh->offset_note = cpu_to_dump64(s, offset_note);
912 kh->note_size = cpu_to_dump64(s, s->note_size);
913
914 if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *
915 block_size, kh, size) < 0) {
916 dump_error(s, "dump: failed to write kdump sub header.\n");
917 ret = -1;
918 goto out;
919 }
920
921 /* write note */
922 s->note_buf = g_malloc0(s->note_size);
923 s->note_buf_offset = 0;
924
925 /* use s->note_buf to store notes temporarily */
926 if (write_elf64_notes(buf_write_note, s) < 0) {
927 ret = -1;
928 goto out;
929 }
930
931 if (write_buffer(s->fd, offset_note, s->note_buf,
932 s->note_size) < 0) {
933 dump_error(s, "dump: failed to write notes");
934 ret = -1;
935 goto out;
936 }
937
938 /* get offset of dump_bitmap */
939 s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *
940 block_size;
941
942 /* get offset of page */
943 s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *
944 block_size;
945
946 out:
947 g_free(dh);
948 g_free(kh);
949 g_free(s->note_buf);
950
951 return ret;
952 }
953
954 static int write_dump_header(DumpState *s)
955 {
956 if (s->dump_info.d_class == ELFCLASS32) {
957 return create_header32(s);
958 } else {
959 return create_header64(s);
960 }
961 }
962
963 /*
964 * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be
965 * rewritten, so if need to set the first bit, set last_pfn and pfn to 0.
966 * set_dump_bitmap will always leave the recently set bit un-sync. And setting
967 * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into
968 * vmcore, ie. synchronizing un-sync bit into vmcore.
969 */
970 static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
971 uint8_t *buf, DumpState *s)
972 {
973 off_t old_offset, new_offset;
974 off_t offset_bitmap1, offset_bitmap2;
975 uint32_t byte, bit;
976
977 /* should not set the previous place */
978 assert(last_pfn <= pfn);
979
980 /*
981 * if the bit needed to be set is not cached in buf, flush the data in buf
982 * to vmcore firstly.
983 * making new_offset be bigger than old_offset can also sync remained data
984 * into vmcore.
985 */
986 old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP);
987 new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP);
988
989 while (old_offset < new_offset) {
990 /* calculate the offset and write dump_bitmap */
991 offset_bitmap1 = s->offset_dump_bitmap + old_offset;
992 if (write_buffer(s->fd, offset_bitmap1, buf,
993 BUFSIZE_BITMAP) < 0) {
994 return -1;
995 }
996
997 /* dump level 1 is chosen, so 1st and 2nd bitmap are same */
998 offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap +
999 old_offset;
1000 if (write_buffer(s->fd, offset_bitmap2, buf,
1001 BUFSIZE_BITMAP) < 0) {
1002 return -1;
1003 }
1004
1005 memset(buf, 0, BUFSIZE_BITMAP);
1006 old_offset += BUFSIZE_BITMAP;
1007 }
1008
1009 /* get the exact place of the bit in the buf, and set it */
1010 byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT;
1011 bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT;
1012 if (value) {
1013 buf[byte] |= 1u << bit;
1014 } else {
1015 buf[byte] &= ~(1u << bit);
1016 }
1017
1018 return 0;
1019 }
1020
1021 /*
1022 * exam every page and return the page frame number and the address of the page.
1023 * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys
1024 * blocks, so block->target_start and block->target_end should be interal
1025 * multiples of the target page size.
1026 */
1027 static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
1028 uint8_t **bufptr, DumpState *s)
1029 {
1030 GuestPhysBlock *block = *blockptr;
1031 hwaddr addr;
1032 uint8_t *buf;
1033
1034 /* block == NULL means the start of the iteration */
1035 if (!block) {
1036 block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
1037 *blockptr = block;
1038 assert((block->target_start & ~TARGET_PAGE_MASK) == 0);
1039 assert((block->target_end & ~TARGET_PAGE_MASK) == 0);
1040 *pfnptr = paddr_to_pfn(block->target_start);
1041 if (bufptr) {
1042 *bufptr = block->host_addr;
1043 }
1044 return true;
1045 }
1046
1047 *pfnptr = *pfnptr + 1;
1048 addr = pfn_to_paddr(*pfnptr);
1049
1050 if ((addr >= block->target_start) &&
1051 (addr + TARGET_PAGE_SIZE <= block->target_end)) {
1052 buf = block->host_addr + (addr - block->target_start);
1053 } else {
1054 /* the next page is in the next block */
1055 block = QTAILQ_NEXT(block, next);
1056 *blockptr = block;
1057 if (!block) {
1058 return false;
1059 }
1060 assert((block->target_start & ~TARGET_PAGE_MASK) == 0);
1061 assert((block->target_end & ~TARGET_PAGE_MASK) == 0);
1062 *pfnptr = paddr_to_pfn(block->target_start);
1063 buf = block->host_addr;
1064 }
1065
1066 if (bufptr) {
1067 *bufptr = buf;
1068 }
1069
1070 return true;
1071 }
1072
1073 static int write_dump_bitmap(DumpState *s)
1074 {
1075 int ret = 0;
1076 uint64_t last_pfn, pfn;
1077 void *dump_bitmap_buf;
1078 size_t num_dumpable;
1079 GuestPhysBlock *block_iter = NULL;
1080
1081 /* dump_bitmap_buf is used to store dump_bitmap temporarily */
1082 dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP);
1083
1084 num_dumpable = 0;
1085 last_pfn = 0;
1086
1087 /*
1088 * exam memory page by page, and set the bit in dump_bitmap corresponded
1089 * to the existing page.
1090 */
1091 while (get_next_page(&block_iter, &pfn, NULL, s)) {
1092 ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s);
1093 if (ret < 0) {
1094 dump_error(s, "dump: failed to set dump_bitmap.\n");
1095 ret = -1;
1096 goto out;
1097 }
1098
1099 last_pfn = pfn;
1100 num_dumpable++;
1101 }
1102
1103 /*
1104 * set_dump_bitmap will always leave the recently set bit un-sync. Here we
1105 * set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be
1106 * synchronized into vmcore.
1107 */
1108 if (num_dumpable > 0) {
1109 ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
1110 dump_bitmap_buf, s);
1111 if (ret < 0) {
1112 dump_error(s, "dump: failed to sync dump_bitmap.\n");
1113 ret = -1;
1114 goto out;
1115 }
1116 }
1117
1118 /* number of dumpable pages that will be dumped later */
1119 s->num_dumpable = num_dumpable;
1120
1121 out:
1122 g_free(dump_bitmap_buf);
1123
1124 return ret;
1125 }
1126
1127 static void prepare_data_cache(DataCache *data_cache, DumpState *s,
1128 off_t offset)
1129 {
1130 data_cache->fd = s->fd;
1131 data_cache->data_size = 0;
1132 data_cache->buf_size = BUFSIZE_DATA_CACHE;
1133 data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE);
1134 data_cache->offset = offset;
1135 }
1136
1137 static int write_cache(DataCache *dc, const void *buf, size_t size,
1138 bool flag_sync)
1139 {
1140 /*
1141 * dc->buf_size should not be less than size, otherwise dc will never be
1142 * enough
1143 */
1144 assert(size <= dc->buf_size);
1145
1146 /*
1147 * if flag_sync is set, synchronize data in dc->buf into vmcore.
1148 * otherwise check if the space is enough for caching data in buf, if not,
1149 * write the data in dc->buf to dc->fd and reset dc->buf
1150 */
1151 if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
1152 (flag_sync && dc->data_size > 0)) {
1153 if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) {
1154 return -1;
1155 }
1156
1157 dc->offset += dc->data_size;
1158 dc->data_size = 0;
1159 }
1160
1161 if (!flag_sync) {
1162 memcpy(dc->buf + dc->data_size, buf, size);
1163 dc->data_size += size;
1164 }
1165
1166 return 0;
1167 }
1168
1169 static void free_data_cache(DataCache *data_cache)
1170 {
1171 g_free(data_cache->buf);
1172 }
1173
1174 static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress)
1175 {
1176 switch (flag_compress) {
1177 case DUMP_DH_COMPRESSED_ZLIB:
1178 return compressBound(page_size);
1179
1180 case DUMP_DH_COMPRESSED_LZO:
1181 /*
1182 * LZO will expand incompressible data by a little amount. Please check
1183 * the following URL to see the expansion calculation:
1184 * http://www.oberhumer.com/opensource/lzo/lzofaq.php
1185 */
1186 return page_size + page_size / 16 + 64 + 3;
1187
1188 #ifdef CONFIG_SNAPPY
1189 case DUMP_DH_COMPRESSED_SNAPPY:
1190 return snappy_max_compressed_length(page_size);
1191 #endif
1192 }
1193 return 0;
1194 }
1195
1196 /*
1197 * check if the page is all 0
1198 */
1199 static inline bool is_zero_page(const uint8_t *buf, size_t page_size)
1200 {
1201 return buffer_is_zero(buf, page_size);
1202 }
1203
1204 static int write_dump_pages(DumpState *s)
1205 {
1206 int ret = 0;
1207 DataCache page_desc, page_data;
1208 size_t len_buf_out, size_out;
1209 #ifdef CONFIG_LZO
1210 lzo_bytep wrkmem = NULL;
1211 #endif
1212 uint8_t *buf_out = NULL;
1213 off_t offset_desc, offset_data;
1214 PageDescriptor pd, pd_zero;
1215 uint8_t *buf;
1216 GuestPhysBlock *block_iter = NULL;
1217 uint64_t pfn_iter;
1218
1219 /* get offset of page_desc and page_data in dump file */
1220 offset_desc = s->offset_page;
1221 offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable;
1222
1223 prepare_data_cache(&page_desc, s, offset_desc);
1224 prepare_data_cache(&page_data, s, offset_data);
1225
1226 /* prepare buffer to store compressed data */
1227 len_buf_out = get_len_buf_out(TARGET_PAGE_SIZE, s->flag_compress);
1228 assert(len_buf_out != 0);
1229
1230 #ifdef CONFIG_LZO
1231 wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS);
1232 #endif
1233
1234 buf_out = g_malloc(len_buf_out);
1235
1236 /*
1237 * init zero page's page_desc and page_data, because every zero page
1238 * uses the same page_data
1239 */
1240 pd_zero.size = cpu_to_dump32(s, TARGET_PAGE_SIZE);
1241 pd_zero.flags = cpu_to_dump32(s, 0);
1242 pd_zero.offset = cpu_to_dump64(s, offset_data);
1243 pd_zero.page_flags = cpu_to_dump64(s, 0);
1244 buf = g_malloc0(TARGET_PAGE_SIZE);
1245 ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false);
1246 g_free(buf);
1247 if (ret < 0) {
1248 dump_error(s, "dump: failed to write page data(zero page).\n");
1249 goto out;
1250 }
1251
1252 offset_data += TARGET_PAGE_SIZE;
1253
1254 /*
1255 * dump memory to vmcore page by page. zero page will all be resided in the
1256 * first page of page section
1257 */
1258 while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
1259 /* check zero page */
1260 if (is_zero_page(buf, TARGET_PAGE_SIZE)) {
1261 ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
1262 false);
1263 if (ret < 0) {
1264 dump_error(s, "dump: failed to write page desc.\n");
1265 goto out;
1266 }
1267 } else {
1268 /*
1269 * not zero page, then:
1270 * 1. compress the page
1271 * 2. write the compressed page into the cache of page_data
1272 * 3. get page desc of the compressed page and write it into the
1273 * cache of page_desc
1274 *
1275 * only one compression format will be used here, for
1276 * s->flag_compress is set. But when compression fails to work,
1277 * we fall back to save in plaintext.
1278 */
1279 size_out = len_buf_out;
1280 if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) &&
1281 (compress2(buf_out, (uLongf *)&size_out, buf,
1282 TARGET_PAGE_SIZE, Z_BEST_SPEED) == Z_OK) &&
1283 (size_out < TARGET_PAGE_SIZE)) {
1284 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB);
1285 pd.size = cpu_to_dump32(s, size_out);
1286
1287 ret = write_cache(&page_data, buf_out, size_out, false);
1288 if (ret < 0) {
1289 dump_error(s, "dump: failed to write page data.\n");
1290 goto out;
1291 }
1292 #ifdef CONFIG_LZO
1293 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) &&
1294 (lzo1x_1_compress(buf, TARGET_PAGE_SIZE, buf_out,
1295 (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) &&
1296 (size_out < TARGET_PAGE_SIZE)) {
1297 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO);
1298 pd.size = cpu_to_dump32(s, size_out);
1299
1300 ret = write_cache(&page_data, buf_out, size_out, false);
1301 if (ret < 0) {
1302 dump_error(s, "dump: failed to write page data.\n");
1303 goto out;
1304 }
1305 #endif
1306 #ifdef CONFIG_SNAPPY
1307 } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) &&
1308 (snappy_compress((char *)buf, TARGET_PAGE_SIZE,
1309 (char *)buf_out, &size_out) == SNAPPY_OK) &&
1310 (size_out < TARGET_PAGE_SIZE)) {
1311 pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY);
1312 pd.size = cpu_to_dump32(s, size_out);
1313
1314 ret = write_cache(&page_data, buf_out, size_out, false);
1315 if (ret < 0) {
1316 dump_error(s, "dump: failed to write page data.\n");
1317 goto out;
1318 }
1319 #endif
1320 } else {
1321 /*
1322 * fall back to save in plaintext, size_out should be
1323 * assigned TARGET_PAGE_SIZE
1324 */
1325 pd.flags = cpu_to_dump32(s, 0);
1326 size_out = TARGET_PAGE_SIZE;
1327 pd.size = cpu_to_dump32(s, size_out);
1328
1329 ret = write_cache(&page_data, buf, TARGET_PAGE_SIZE, false);
1330 if (ret < 0) {
1331 dump_error(s, "dump: failed to write page data.\n");
1332 goto out;
1333 }
1334 }
1335
1336 /* get and write page desc here */
1337 pd.page_flags = cpu_to_dump64(s, 0);
1338 pd.offset = cpu_to_dump64(s, offset_data);
1339 offset_data += size_out;
1340
1341 ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false);
1342 if (ret < 0) {
1343 dump_error(s, "dump: failed to write page desc.\n");
1344 goto out;
1345 }
1346 }
1347 }
1348
1349 ret = write_cache(&page_desc, NULL, 0, true);
1350 if (ret < 0) {
1351 dump_error(s, "dump: failed to sync cache for page_desc.\n");
1352 goto out;
1353 }
1354 ret = write_cache(&page_data, NULL, 0, true);
1355 if (ret < 0) {
1356 dump_error(s, "dump: failed to sync cache for page_data.\n");
1357 goto out;
1358 }
1359
1360 out:
1361 free_data_cache(&page_desc);
1362 free_data_cache(&page_data);
1363
1364 #ifdef CONFIG_LZO
1365 g_free(wrkmem);
1366 #endif
1367
1368 g_free(buf_out);
1369
1370 return ret;
1371 }
1372
1373 static int create_kdump_vmcore(DumpState *s)
1374 {
1375 int ret;
1376
1377 /*
1378 * the kdump-compressed format is:
1379 * File offset
1380 * +------------------------------------------+ 0x0
1381 * | main header (struct disk_dump_header) |
1382 * |------------------------------------------+ block 1
1383 * | sub header (struct kdump_sub_header) |
1384 * |------------------------------------------+ block 2
1385 * | 1st-dump_bitmap |
1386 * |------------------------------------------+ block 2 + X blocks
1387 * | 2nd-dump_bitmap | (aligned by block)
1388 * |------------------------------------------+ block 2 + 2 * X blocks
1389 * | page desc for pfn 0 (struct page_desc) | (aligned by block)
1390 * | page desc for pfn 1 (struct page_desc) |
1391 * | : |
1392 * |------------------------------------------| (not aligned by block)
1393 * | page data (pfn 0) |
1394 * | page data (pfn 1) |
1395 * | : |
1396 * +------------------------------------------+
1397 */
1398
1399 ret = write_start_flat_header(s->fd);
1400 if (ret < 0) {
1401 dump_error(s, "dump: failed to write start flat header.\n");
1402 return -1;
1403 }
1404
1405 ret = write_dump_header(s);
1406 if (ret < 0) {
1407 return -1;
1408 }
1409
1410 ret = write_dump_bitmap(s);
1411 if (ret < 0) {
1412 return -1;
1413 }
1414
1415 ret = write_dump_pages(s);
1416 if (ret < 0) {
1417 return -1;
1418 }
1419
1420 ret = write_end_flat_header(s->fd);
1421 if (ret < 0) {
1422 dump_error(s, "dump: failed to write end flat header.\n");
1423 return -1;
1424 }
1425
1426 dump_completed(s);
1427
1428 return 0;
1429 }
1430
1431 static ram_addr_t get_start_block(DumpState *s)
1432 {
1433 GuestPhysBlock *block;
1434
1435 if (!s->has_filter) {
1436 s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
1437 return 0;
1438 }
1439
1440 QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {
1441 if (block->target_start >= s->begin + s->length ||
1442 block->target_end <= s->begin) {
1443 /* This block is out of the range */
1444 continue;
1445 }
1446
1447 s->next_block = block;
1448 if (s->begin > block->target_start) {
1449 s->start = s->begin - block->target_start;
1450 } else {
1451 s->start = 0;
1452 }
1453 return s->start;
1454 }
1455
1456 return -1;
1457 }
1458
1459 static void get_max_mapnr(DumpState *s)
1460 {
1461 GuestPhysBlock *last_block;
1462
1463 last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead);
1464 s->max_mapnr = paddr_to_pfn(last_block->target_end);
1465 }
1466
1467 static int dump_init(DumpState *s, int fd, bool has_format,
1468 DumpGuestMemoryFormat format, bool paging, bool has_filter,
1469 int64_t begin, int64_t length, Error **errp)
1470 {
1471 CPUState *cpu;
1472 int nr_cpus;
1473 Error *err = NULL;
1474 int ret;
1475
1476 /* kdump-compressed is conflict with paging and filter */
1477 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
1478 assert(!paging && !has_filter);
1479 }
1480
1481 if (runstate_is_running()) {
1482 vm_stop(RUN_STATE_SAVE_VM);
1483 s->resume = true;
1484 } else {
1485 s->resume = false;
1486 }
1487
1488 /* If we use KVM, we should synchronize the registers before we get dump
1489 * info or physmap info.
1490 */
1491 cpu_synchronize_all_states();
1492 nr_cpus = 0;
1493 CPU_FOREACH(cpu) {
1494 nr_cpus++;
1495 }
1496
1497 s->fd = fd;
1498 s->has_filter = has_filter;
1499 s->begin = begin;
1500 s->length = length;
1501
1502 guest_phys_blocks_init(&s->guest_phys_blocks);
1503 guest_phys_blocks_append(&s->guest_phys_blocks);
1504
1505 s->start = get_start_block(s);
1506 if (s->start == -1) {
1507 error_set(errp, QERR_INVALID_PARAMETER, "begin");
1508 goto cleanup;
1509 }
1510
1511 /* get dump info: endian, class and architecture.
1512 * If the target architecture is not supported, cpu_get_dump_info() will
1513 * return -1.
1514 */
1515 ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks);
1516 if (ret < 0) {
1517 error_set(errp, QERR_UNSUPPORTED);
1518 goto cleanup;
1519 }
1520
1521 s->note_size = cpu_get_note_size(s->dump_info.d_class,
1522 s->dump_info.d_machine, nr_cpus);
1523 if (s->note_size < 0) {
1524 error_set(errp, QERR_UNSUPPORTED);
1525 goto cleanup;
1526 }
1527
1528 /* get memory mapping */
1529 memory_mapping_list_init(&s->list);
1530 if (paging) {
1531 qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err);
1532 if (err != NULL) {
1533 error_propagate(errp, err);
1534 goto cleanup;
1535 }
1536 } else {
1537 qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks);
1538 }
1539
1540 s->nr_cpus = nr_cpus;
1541
1542 get_max_mapnr(s);
1543
1544 uint64_t tmp;
1545 tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), TARGET_PAGE_SIZE);
1546 s->len_dump_bitmap = tmp * TARGET_PAGE_SIZE;
1547
1548 /* init for kdump-compressed format */
1549 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
1550 switch (format) {
1551 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB:
1552 s->flag_compress = DUMP_DH_COMPRESSED_ZLIB;
1553 break;
1554
1555 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO:
1556 #ifdef CONFIG_LZO
1557 if (lzo_init() != LZO_E_OK) {
1558 error_setg(errp, "failed to initialize the LZO library");
1559 goto cleanup;
1560 }
1561 #endif
1562 s->flag_compress = DUMP_DH_COMPRESSED_LZO;
1563 break;
1564
1565 case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY:
1566 s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY;
1567 break;
1568
1569 default:
1570 s->flag_compress = 0;
1571 }
1572
1573 return 0;
1574 }
1575
1576 if (s->has_filter) {
1577 memory_mapping_filter(&s->list, s->begin, s->length);
1578 }
1579
1580 /*
1581 * calculate phdr_num
1582 *
1583 * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow
1584 */
1585 s->phdr_num = 1; /* PT_NOTE */
1586 if (s->list.num < UINT16_MAX - 2) {
1587 s->phdr_num += s->list.num;
1588 s->have_section = false;
1589 } else {
1590 s->have_section = true;
1591 s->phdr_num = PN_XNUM;
1592 s->sh_info = 1; /* PT_NOTE */
1593
1594 /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */
1595 if (s->list.num <= UINT32_MAX - 1) {
1596 s->sh_info += s->list.num;
1597 } else {
1598 s->sh_info = UINT32_MAX;
1599 }
1600 }
1601
1602 if (s->dump_info.d_class == ELFCLASS64) {
1603 if (s->have_section) {
1604 s->memory_offset = sizeof(Elf64_Ehdr) +
1605 sizeof(Elf64_Phdr) * s->sh_info +
1606 sizeof(Elf64_Shdr) + s->note_size;
1607 } else {
1608 s->memory_offset = sizeof(Elf64_Ehdr) +
1609 sizeof(Elf64_Phdr) * s->phdr_num + s->note_size;
1610 }
1611 } else {
1612 if (s->have_section) {
1613 s->memory_offset = sizeof(Elf32_Ehdr) +
1614 sizeof(Elf32_Phdr) * s->sh_info +
1615 sizeof(Elf32_Shdr) + s->note_size;
1616 } else {
1617 s->memory_offset = sizeof(Elf32_Ehdr) +
1618 sizeof(Elf32_Phdr) * s->phdr_num + s->note_size;
1619 }
1620 }
1621
1622 return 0;
1623
1624 cleanup:
1625 guest_phys_blocks_free(&s->guest_phys_blocks);
1626
1627 if (s->resume) {
1628 vm_start();
1629 }
1630
1631 return -1;
1632 }
1633
1634 void qmp_dump_guest_memory(bool paging, const char *file, bool has_begin,
1635 int64_t begin, bool has_length,
1636 int64_t length, bool has_format,
1637 DumpGuestMemoryFormat format, Error **errp)
1638 {
1639 const char *p;
1640 int fd = -1;
1641 DumpState *s;
1642 int ret;
1643
1644 /*
1645 * kdump-compressed format need the whole memory dumped, so paging or
1646 * filter is not supported here.
1647 */
1648 if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) &&
1649 (paging || has_begin || has_length)) {
1650 error_setg(errp, "kdump-compressed format doesn't support paging or "
1651 "filter");
1652 return;
1653 }
1654 if (has_begin && !has_length) {
1655 error_set(errp, QERR_MISSING_PARAMETER, "length");
1656 return;
1657 }
1658 if (!has_begin && has_length) {
1659 error_set(errp, QERR_MISSING_PARAMETER, "begin");
1660 return;
1661 }
1662
1663 /* check whether lzo/snappy is supported */
1664 #ifndef CONFIG_LZO
1665 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) {
1666 error_setg(errp, "kdump-lzo is not available now");
1667 return;
1668 }
1669 #endif
1670
1671 #ifndef CONFIG_SNAPPY
1672 if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) {
1673 error_setg(errp, "kdump-snappy is not available now");
1674 return;
1675 }
1676 #endif
1677
1678 #if !defined(WIN32)
1679 if (strstart(file, "fd:", &p)) {
1680 fd = monitor_get_fd(cur_mon, p, errp);
1681 if (fd == -1) {
1682 return;
1683 }
1684 }
1685 #endif
1686
1687 if (strstart(file, "file:", &p)) {
1688 fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR);
1689 if (fd < 0) {
1690 error_setg_file_open(errp, errno, p);
1691 return;
1692 }
1693 }
1694
1695 if (fd == -1) {
1696 error_set(errp, QERR_INVALID_PARAMETER, "protocol");
1697 return;
1698 }
1699
1700 s = g_malloc0(sizeof(DumpState));
1701
1702 ret = dump_init(s, fd, has_format, format, paging, has_begin,
1703 begin, length, errp);
1704 if (ret < 0) {
1705 g_free(s);
1706 return;
1707 }
1708
1709 if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) {
1710 if (create_kdump_vmcore(s) < 0) {
1711 error_set(errp, QERR_IO_ERROR);
1712 }
1713 } else {
1714 if (create_vmcore(s) < 0) {
1715 error_set(errp, QERR_IO_ERROR);
1716 }
1717 }
1718
1719 g_free(s);
1720 }
1721
1722 DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
1723 {
1724 DumpGuestMemoryFormatList *item;
1725 DumpGuestMemoryCapability *cap =
1726 g_malloc0(sizeof(DumpGuestMemoryCapability));
1727
1728 /* elf is always available */
1729 item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
1730 cap->formats = item;
1731 item->value = DUMP_GUEST_MEMORY_FORMAT_ELF;
1732
1733 /* kdump-zlib is always available */
1734 item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
1735 item = item->next;
1736 item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
1737
1738 /* add new item if kdump-lzo is available */
1739 #ifdef CONFIG_LZO
1740 item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
1741 item = item->next;
1742 item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO;
1743 #endif
1744
1745 /* add new item if kdump-snappy is available */
1746 #ifdef CONFIG_SNAPPY
1747 item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
1748 item = item->next;
1749 item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
1750 #endif
1751
1752 return cap;
1753 }
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