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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/osdep.h" | |
15 | #include "qemu/cutils.h" | |
16 | #include "elf.h" | |
17 | #include "cpu.h" | |
18 | #include "exec/cpu-all.h" | |
19 | #include "exec/hwaddr.h" | |
20 | #include "monitor/monitor.h" | |
21 | #include "sysemu/kvm.h" | |
22 | #include "sysemu/dump.h" | |
23 | #include "sysemu/sysemu.h" | |
24 | #include "sysemu/memory_mapping.h" | |
25 | #include "sysemu/cpus.h" | |
26 | #include "qapi/qmp/qerror.h" | |
27 | #include "qmp-commands.h" | |
28 | #include "qapi-event.h" | |
29 | ||
30 | #include <zlib.h> | |
31 | #ifdef CONFIG_LZO | |
32 | #include <lzo/lzo1x.h> | |
33 | #endif | |
34 | #ifdef CONFIG_SNAPPY | |
35 | #include <snappy-c.h> | |
36 | #endif | |
37 | #ifndef ELF_MACHINE_UNAME | |
38 | #define ELF_MACHINE_UNAME "Unknown" | |
39 | #endif | |
40 | ||
41 | uint16_t cpu_to_dump16(DumpState *s, uint16_t val) | |
42 | { | |
43 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
44 | val = cpu_to_le16(val); | |
45 | } else { | |
46 | val = cpu_to_be16(val); | |
47 | } | |
48 | ||
49 | return val; | |
50 | } | |
51 | ||
52 | uint32_t cpu_to_dump32(DumpState *s, uint32_t val) | |
53 | { | |
54 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
55 | val = cpu_to_le32(val); | |
56 | } else { | |
57 | val = cpu_to_be32(val); | |
58 | } | |
59 | ||
60 | return val; | |
61 | } | |
62 | ||
63 | uint64_t cpu_to_dump64(DumpState *s, uint64_t val) | |
64 | { | |
65 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
66 | val = cpu_to_le64(val); | |
67 | } else { | |
68 | val = cpu_to_be64(val); | |
69 | } | |
70 | ||
71 | return val; | |
72 | } | |
73 | ||
74 | static int dump_cleanup(DumpState *s) | |
75 | { | |
76 | guest_phys_blocks_free(&s->guest_phys_blocks); | |
77 | memory_mapping_list_free(&s->list); | |
78 | close(s->fd); | |
79 | if (s->resume) { | |
80 | vm_start(); | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int fd_write_vmcore(const void *buf, size_t size, void *opaque) | |
87 | { | |
88 | DumpState *s = opaque; | |
89 | size_t written_size; | |
90 | ||
91 | written_size = qemu_write_full(s->fd, buf, size); | |
92 | if (written_size != size) { | |
93 | return -1; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void write_elf64_header(DumpState *s, Error **errp) | |
100 | { | |
101 | Elf64_Ehdr elf_header; | |
102 | int ret; | |
103 | ||
104 | memset(&elf_header, 0, sizeof(Elf64_Ehdr)); | |
105 | memcpy(&elf_header, ELFMAG, SELFMAG); | |
106 | elf_header.e_ident[EI_CLASS] = ELFCLASS64; | |
107 | elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; | |
108 | elf_header.e_ident[EI_VERSION] = EV_CURRENT; | |
109 | elf_header.e_type = cpu_to_dump16(s, ET_CORE); | |
110 | elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
111 | elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); | |
112 | elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
113 | elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); | |
114 | elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); | |
115 | elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); | |
116 | if (s->have_section) { | |
117 | uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; | |
118 | ||
119 | elf_header.e_shoff = cpu_to_dump64(s, shoff); | |
120 | elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); | |
121 | elf_header.e_shnum = cpu_to_dump16(s, 1); | |
122 | } | |
123 | ||
124 | ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); | |
125 | if (ret < 0) { | |
126 | error_setg(errp, "dump: failed to write elf header"); | |
127 | } | |
128 | } | |
129 | ||
130 | static void write_elf32_header(DumpState *s, Error **errp) | |
131 | { | |
132 | Elf32_Ehdr elf_header; | |
133 | int ret; | |
134 | ||
135 | memset(&elf_header, 0, sizeof(Elf32_Ehdr)); | |
136 | memcpy(&elf_header, ELFMAG, SELFMAG); | |
137 | elf_header.e_ident[EI_CLASS] = ELFCLASS32; | |
138 | elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; | |
139 | elf_header.e_ident[EI_VERSION] = EV_CURRENT; | |
140 | elf_header.e_type = cpu_to_dump16(s, ET_CORE); | |
141 | elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
142 | elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); | |
143 | elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
144 | elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); | |
145 | elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); | |
146 | elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); | |
147 | if (s->have_section) { | |
148 | uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; | |
149 | ||
150 | elf_header.e_shoff = cpu_to_dump32(s, shoff); | |
151 | elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); | |
152 | elf_header.e_shnum = cpu_to_dump16(s, 1); | |
153 | } | |
154 | ||
155 | ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); | |
156 | if (ret < 0) { | |
157 | error_setg(errp, "dump: failed to write elf header"); | |
158 | } | |
159 | } | |
160 | ||
161 | static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, | |
162 | int phdr_index, hwaddr offset, | |
163 | hwaddr filesz, Error **errp) | |
164 | { | |
165 | Elf64_Phdr phdr; | |
166 | int ret; | |
167 | ||
168 | memset(&phdr, 0, sizeof(Elf64_Phdr)); | |
169 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); | |
170 | phdr.p_offset = cpu_to_dump64(s, offset); | |
171 | phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); | |
172 | phdr.p_filesz = cpu_to_dump64(s, filesz); | |
173 | phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); | |
174 | phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr); | |
175 | ||
176 | assert(memory_mapping->length >= filesz); | |
177 | ||
178 | ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); | |
179 | if (ret < 0) { | |
180 | error_setg(errp, "dump: failed to write program header table"); | |
181 | } | |
182 | } | |
183 | ||
184 | static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, | |
185 | int phdr_index, hwaddr offset, | |
186 | hwaddr filesz, Error **errp) | |
187 | { | |
188 | Elf32_Phdr phdr; | |
189 | int ret; | |
190 | ||
191 | memset(&phdr, 0, sizeof(Elf32_Phdr)); | |
192 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); | |
193 | phdr.p_offset = cpu_to_dump32(s, offset); | |
194 | phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); | |
195 | phdr.p_filesz = cpu_to_dump32(s, filesz); | |
196 | phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); | |
197 | phdr.p_vaddr = cpu_to_dump32(s, memory_mapping->virt_addr); | |
198 | ||
199 | assert(memory_mapping->length >= filesz); | |
200 | ||
201 | ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); | |
202 | if (ret < 0) { | |
203 | error_setg(errp, "dump: failed to write program header table"); | |
204 | } | |
205 | } | |
206 | ||
207 | static void write_elf64_note(DumpState *s, Error **errp) | |
208 | { | |
209 | Elf64_Phdr phdr; | |
210 | hwaddr begin = s->memory_offset - s->note_size; | |
211 | int ret; | |
212 | ||
213 | memset(&phdr, 0, sizeof(Elf64_Phdr)); | |
214 | phdr.p_type = cpu_to_dump32(s, PT_NOTE); | |
215 | phdr.p_offset = cpu_to_dump64(s, begin); | |
216 | phdr.p_paddr = 0; | |
217 | phdr.p_filesz = cpu_to_dump64(s, s->note_size); | |
218 | phdr.p_memsz = cpu_to_dump64(s, s->note_size); | |
219 | phdr.p_vaddr = 0; | |
220 | ||
221 | ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); | |
222 | if (ret < 0) { | |
223 | error_setg(errp, "dump: failed to write program header table"); | |
224 | } | |
225 | } | |
226 | ||
227 | static inline int cpu_index(CPUState *cpu) | |
228 | { | |
229 | return cpu->cpu_index + 1; | |
230 | } | |
231 | ||
232 | static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, | |
233 | Error **errp) | |
234 | { | |
235 | CPUState *cpu; | |
236 | int ret; | |
237 | int id; | |
238 | ||
239 | CPU_FOREACH(cpu) { | |
240 | id = cpu_index(cpu); | |
241 | ret = cpu_write_elf64_note(f, cpu, id, s); | |
242 | if (ret < 0) { | |
243 | error_setg(errp, "dump: failed to write elf notes"); | |
244 | return; | |
245 | } | |
246 | } | |
247 | ||
248 | CPU_FOREACH(cpu) { | |
249 | ret = cpu_write_elf64_qemunote(f, cpu, s); | |
250 | if (ret < 0) { | |
251 | error_setg(errp, "dump: failed to write CPU status"); | |
252 | return; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
257 | static void write_elf32_note(DumpState *s, Error **errp) | |
258 | { | |
259 | hwaddr begin = s->memory_offset - s->note_size; | |
260 | Elf32_Phdr phdr; | |
261 | int ret; | |
262 | ||
263 | memset(&phdr, 0, sizeof(Elf32_Phdr)); | |
264 | phdr.p_type = cpu_to_dump32(s, PT_NOTE); | |
265 | phdr.p_offset = cpu_to_dump32(s, begin); | |
266 | phdr.p_paddr = 0; | |
267 | phdr.p_filesz = cpu_to_dump32(s, s->note_size); | |
268 | phdr.p_memsz = cpu_to_dump32(s, s->note_size); | |
269 | phdr.p_vaddr = 0; | |
270 | ||
271 | ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); | |
272 | if (ret < 0) { | |
273 | error_setg(errp, "dump: failed to write program header table"); | |
274 | } | |
275 | } | |
276 | ||
277 | static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, | |
278 | Error **errp) | |
279 | { | |
280 | CPUState *cpu; | |
281 | int ret; | |
282 | int id; | |
283 | ||
284 | CPU_FOREACH(cpu) { | |
285 | id = cpu_index(cpu); | |
286 | ret = cpu_write_elf32_note(f, cpu, id, s); | |
287 | if (ret < 0) { | |
288 | error_setg(errp, "dump: failed to write elf notes"); | |
289 | return; | |
290 | } | |
291 | } | |
292 | ||
293 | CPU_FOREACH(cpu) { | |
294 | ret = cpu_write_elf32_qemunote(f, cpu, s); | |
295 | if (ret < 0) { | |
296 | error_setg(errp, "dump: failed to write CPU status"); | |
297 | return; | |
298 | } | |
299 | } | |
300 | } | |
301 | ||
302 | static void write_elf_section(DumpState *s, int type, Error **errp) | |
303 | { | |
304 | Elf32_Shdr shdr32; | |
305 | Elf64_Shdr shdr64; | |
306 | int shdr_size; | |
307 | void *shdr; | |
308 | int ret; | |
309 | ||
310 | if (type == 0) { | |
311 | shdr_size = sizeof(Elf32_Shdr); | |
312 | memset(&shdr32, 0, shdr_size); | |
313 | shdr32.sh_info = cpu_to_dump32(s, s->sh_info); | |
314 | shdr = &shdr32; | |
315 | } else { | |
316 | shdr_size = sizeof(Elf64_Shdr); | |
317 | memset(&shdr64, 0, shdr_size); | |
318 | shdr64.sh_info = cpu_to_dump32(s, s->sh_info); | |
319 | shdr = &shdr64; | |
320 | } | |
321 | ||
322 | ret = fd_write_vmcore(&shdr, shdr_size, s); | |
323 | if (ret < 0) { | |
324 | error_setg(errp, "dump: failed to write section header table"); | |
325 | } | |
326 | } | |
327 | ||
328 | static void write_data(DumpState *s, void *buf, int length, Error **errp) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | ret = fd_write_vmcore(buf, length, s); | |
333 | if (ret < 0) { | |
334 | error_setg(errp, "dump: failed to save memory"); | |
335 | } else { | |
336 | s->written_size += length; | |
337 | } | |
338 | } | |
339 | ||
340 | /* write the memory to vmcore. 1 page per I/O. */ | |
341 | static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, | |
342 | int64_t size, Error **errp) | |
343 | { | |
344 | int64_t i; | |
345 | Error *local_err = NULL; | |
346 | ||
347 | for (i = 0; i < size / s->dump_info.page_size; i++) { | |
348 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
349 | s->dump_info.page_size, &local_err); | |
350 | if (local_err) { | |
351 | error_propagate(errp, local_err); | |
352 | return; | |
353 | } | |
354 | } | |
355 | ||
356 | if ((size % s->dump_info.page_size) != 0) { | |
357 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
358 | size % s->dump_info.page_size, &local_err); | |
359 | if (local_err) { | |
360 | error_propagate(errp, local_err); | |
361 | return; | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
366 | /* get the memory's offset and size in the vmcore */ | |
367 | static void get_offset_range(hwaddr phys_addr, | |
368 | ram_addr_t mapping_length, | |
369 | DumpState *s, | |
370 | hwaddr *p_offset, | |
371 | hwaddr *p_filesz) | |
372 | { | |
373 | GuestPhysBlock *block; | |
374 | hwaddr offset = s->memory_offset; | |
375 | int64_t size_in_block, start; | |
376 | ||
377 | /* When the memory is not stored into vmcore, offset will be -1 */ | |
378 | *p_offset = -1; | |
379 | *p_filesz = 0; | |
380 | ||
381 | if (s->has_filter) { | |
382 | if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { | |
383 | return; | |
384 | } | |
385 | } | |
386 | ||
387 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
388 | if (s->has_filter) { | |
389 | if (block->target_start >= s->begin + s->length || | |
390 | block->target_end <= s->begin) { | |
391 | /* This block is out of the range */ | |
392 | continue; | |
393 | } | |
394 | ||
395 | if (s->begin <= block->target_start) { | |
396 | start = block->target_start; | |
397 | } else { | |
398 | start = s->begin; | |
399 | } | |
400 | ||
401 | size_in_block = block->target_end - start; | |
402 | if (s->begin + s->length < block->target_end) { | |
403 | size_in_block -= block->target_end - (s->begin + s->length); | |
404 | } | |
405 | } else { | |
406 | start = block->target_start; | |
407 | size_in_block = block->target_end - block->target_start; | |
408 | } | |
409 | ||
410 | if (phys_addr >= start && phys_addr < start + size_in_block) { | |
411 | *p_offset = phys_addr - start + offset; | |
412 | ||
413 | /* The offset range mapped from the vmcore file must not spill over | |
414 | * the GuestPhysBlock, clamp it. The rest of the mapping will be | |
415 | * zero-filled in memory at load time; see | |
416 | * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. | |
417 | */ | |
418 | *p_filesz = phys_addr + mapping_length <= start + size_in_block ? | |
419 | mapping_length : | |
420 | size_in_block - (phys_addr - start); | |
421 | return; | |
422 | } | |
423 | ||
424 | offset += size_in_block; | |
425 | } | |
426 | } | |
427 | ||
428 | static void write_elf_loads(DumpState *s, Error **errp) | |
429 | { | |
430 | hwaddr offset, filesz; | |
431 | MemoryMapping *memory_mapping; | |
432 | uint32_t phdr_index = 1; | |
433 | uint32_t max_index; | |
434 | Error *local_err = NULL; | |
435 | ||
436 | if (s->have_section) { | |
437 | max_index = s->sh_info; | |
438 | } else { | |
439 | max_index = s->phdr_num; | |
440 | } | |
441 | ||
442 | QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { | |
443 | get_offset_range(memory_mapping->phys_addr, | |
444 | memory_mapping->length, | |
445 | s, &offset, &filesz); | |
446 | if (s->dump_info.d_class == ELFCLASS64) { | |
447 | write_elf64_load(s, memory_mapping, phdr_index++, offset, | |
448 | filesz, &local_err); | |
449 | } else { | |
450 | write_elf32_load(s, memory_mapping, phdr_index++, offset, | |
451 | filesz, &local_err); | |
452 | } | |
453 | ||
454 | if (local_err) { | |
455 | error_propagate(errp, local_err); | |
456 | return; | |
457 | } | |
458 | ||
459 | if (phdr_index >= max_index) { | |
460 | break; | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
465 | /* write elf header, PT_NOTE and elf note to vmcore. */ | |
466 | static void dump_begin(DumpState *s, Error **errp) | |
467 | { | |
468 | Error *local_err = NULL; | |
469 | ||
470 | /* | |
471 | * the vmcore's format is: | |
472 | * -------------- | |
473 | * | elf header | | |
474 | * -------------- | |
475 | * | PT_NOTE | | |
476 | * -------------- | |
477 | * | PT_LOAD | | |
478 | * -------------- | |
479 | * | ...... | | |
480 | * -------------- | |
481 | * | PT_LOAD | | |
482 | * -------------- | |
483 | * | sec_hdr | | |
484 | * -------------- | |
485 | * | elf note | | |
486 | * -------------- | |
487 | * | memory | | |
488 | * -------------- | |
489 | * | |
490 | * we only know where the memory is saved after we write elf note into | |
491 | * vmcore. | |
492 | */ | |
493 | ||
494 | /* write elf header to vmcore */ | |
495 | if (s->dump_info.d_class == ELFCLASS64) { | |
496 | write_elf64_header(s, &local_err); | |
497 | } else { | |
498 | write_elf32_header(s, &local_err); | |
499 | } | |
500 | if (local_err) { | |
501 | error_propagate(errp, local_err); | |
502 | return; | |
503 | } | |
504 | ||
505 | if (s->dump_info.d_class == ELFCLASS64) { | |
506 | /* write PT_NOTE to vmcore */ | |
507 | write_elf64_note(s, &local_err); | |
508 | if (local_err) { | |
509 | error_propagate(errp, local_err); | |
510 | return; | |
511 | } | |
512 | ||
513 | /* write all PT_LOAD to vmcore */ | |
514 | write_elf_loads(s, &local_err); | |
515 | if (local_err) { | |
516 | error_propagate(errp, local_err); | |
517 | return; | |
518 | } | |
519 | ||
520 | /* write section to vmcore */ | |
521 | if (s->have_section) { | |
522 | write_elf_section(s, 1, &local_err); | |
523 | if (local_err) { | |
524 | error_propagate(errp, local_err); | |
525 | return; | |
526 | } | |
527 | } | |
528 | ||
529 | /* write notes to vmcore */ | |
530 | write_elf64_notes(fd_write_vmcore, s, &local_err); | |
531 | if (local_err) { | |
532 | error_propagate(errp, local_err); | |
533 | return; | |
534 | } | |
535 | } else { | |
536 | /* write PT_NOTE to vmcore */ | |
537 | write_elf32_note(s, &local_err); | |
538 | if (local_err) { | |
539 | error_propagate(errp, local_err); | |
540 | return; | |
541 | } | |
542 | ||
543 | /* write all PT_LOAD to vmcore */ | |
544 | write_elf_loads(s, &local_err); | |
545 | if (local_err) { | |
546 | error_propagate(errp, local_err); | |
547 | return; | |
548 | } | |
549 | ||
550 | /* write section to vmcore */ | |
551 | if (s->have_section) { | |
552 | write_elf_section(s, 0, &local_err); | |
553 | if (local_err) { | |
554 | error_propagate(errp, local_err); | |
555 | return; | |
556 | } | |
557 | } | |
558 | ||
559 | /* write notes to vmcore */ | |
560 | write_elf32_notes(fd_write_vmcore, s, &local_err); | |
561 | if (local_err) { | |
562 | error_propagate(errp, local_err); | |
563 | return; | |
564 | } | |
565 | } | |
566 | } | |
567 | ||
568 | static int get_next_block(DumpState *s, GuestPhysBlock *block) | |
569 | { | |
570 | while (1) { | |
571 | block = QTAILQ_NEXT(block, next); | |
572 | if (!block) { | |
573 | /* no more block */ | |
574 | return 1; | |
575 | } | |
576 | ||
577 | s->start = 0; | |
578 | s->next_block = block; | |
579 | if (s->has_filter) { | |
580 | if (block->target_start >= s->begin + s->length || | |
581 | block->target_end <= s->begin) { | |
582 | /* This block is out of the range */ | |
583 | continue; | |
584 | } | |
585 | ||
586 | if (s->begin > block->target_start) { | |
587 | s->start = s->begin - block->target_start; | |
588 | } | |
589 | } | |
590 | ||
591 | return 0; | |
592 | } | |
593 | } | |
594 | ||
595 | /* write all memory to vmcore */ | |
596 | static void dump_iterate(DumpState *s, Error **errp) | |
597 | { | |
598 | GuestPhysBlock *block; | |
599 | int64_t size; | |
600 | Error *local_err = NULL; | |
601 | ||
602 | do { | |
603 | block = s->next_block; | |
604 | ||
605 | size = block->target_end - block->target_start; | |
606 | if (s->has_filter) { | |
607 | size -= s->start; | |
608 | if (s->begin + s->length < block->target_end) { | |
609 | size -= block->target_end - (s->begin + s->length); | |
610 | } | |
611 | } | |
612 | write_memory(s, block, s->start, size, &local_err); | |
613 | if (local_err) { | |
614 | error_propagate(errp, local_err); | |
615 | return; | |
616 | } | |
617 | ||
618 | } while (!get_next_block(s, block)); | |
619 | } | |
620 | ||
621 | static void create_vmcore(DumpState *s, Error **errp) | |
622 | { | |
623 | Error *local_err = NULL; | |
624 | ||
625 | dump_begin(s, &local_err); | |
626 | if (local_err) { | |
627 | error_propagate(errp, local_err); | |
628 | return; | |
629 | } | |
630 | ||
631 | dump_iterate(s, errp); | |
632 | } | |
633 | ||
634 | static int write_start_flat_header(int fd) | |
635 | { | |
636 | MakedumpfileHeader *mh; | |
637 | int ret = 0; | |
638 | ||
639 | QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); | |
640 | mh = g_malloc0(MAX_SIZE_MDF_HEADER); | |
641 | ||
642 | memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, | |
643 | MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); | |
644 | ||
645 | mh->type = cpu_to_be64(TYPE_FLAT_HEADER); | |
646 | mh->version = cpu_to_be64(VERSION_FLAT_HEADER); | |
647 | ||
648 | size_t written_size; | |
649 | written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); | |
650 | if (written_size != MAX_SIZE_MDF_HEADER) { | |
651 | ret = -1; | |
652 | } | |
653 | ||
654 | g_free(mh); | |
655 | return ret; | |
656 | } | |
657 | ||
658 | static int write_end_flat_header(int fd) | |
659 | { | |
660 | MakedumpfileDataHeader mdh; | |
661 | ||
662 | mdh.offset = END_FLAG_FLAT_HEADER; | |
663 | mdh.buf_size = END_FLAG_FLAT_HEADER; | |
664 | ||
665 | size_t written_size; | |
666 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
667 | if (written_size != sizeof(mdh)) { | |
668 | return -1; | |
669 | } | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static int write_buffer(int fd, off_t offset, const void *buf, size_t size) | |
675 | { | |
676 | size_t written_size; | |
677 | MakedumpfileDataHeader mdh; | |
678 | ||
679 | mdh.offset = cpu_to_be64(offset); | |
680 | mdh.buf_size = cpu_to_be64(size); | |
681 | ||
682 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
683 | if (written_size != sizeof(mdh)) { | |
684 | return -1; | |
685 | } | |
686 | ||
687 | written_size = qemu_write_full(fd, buf, size); | |
688 | if (written_size != size) { | |
689 | return -1; | |
690 | } | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static int buf_write_note(const void *buf, size_t size, void *opaque) | |
696 | { | |
697 | DumpState *s = opaque; | |
698 | ||
699 | /* note_buf is not enough */ | |
700 | if (s->note_buf_offset + size > s->note_size) { | |
701 | return -1; | |
702 | } | |
703 | ||
704 | memcpy(s->note_buf + s->note_buf_offset, buf, size); | |
705 | ||
706 | s->note_buf_offset += size; | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | /* write common header, sub header and elf note to vmcore */ | |
712 | static void create_header32(DumpState *s, Error **errp) | |
713 | { | |
714 | DiskDumpHeader32 *dh = NULL; | |
715 | KdumpSubHeader32 *kh = NULL; | |
716 | size_t size; | |
717 | uint32_t block_size; | |
718 | uint32_t sub_hdr_size; | |
719 | uint32_t bitmap_blocks; | |
720 | uint32_t status = 0; | |
721 | uint64_t offset_note; | |
722 | Error *local_err = NULL; | |
723 | ||
724 | /* write common header, the version of kdump-compressed format is 6th */ | |
725 | size = sizeof(DiskDumpHeader32); | |
726 | dh = g_malloc0(size); | |
727 | ||
728 | strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); | |
729 | dh->header_version = cpu_to_dump32(s, 6); | |
730 | block_size = s->dump_info.page_size; | |
731 | dh->block_size = cpu_to_dump32(s, block_size); | |
732 | sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; | |
733 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
734 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); | |
735 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ | |
736 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); | |
737 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
738 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; | |
739 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); | |
740 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); | |
741 | ||
742 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
743 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
744 | } | |
745 | #ifdef CONFIG_LZO | |
746 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
747 | status |= DUMP_DH_COMPRESSED_LZO; | |
748 | } | |
749 | #endif | |
750 | #ifdef CONFIG_SNAPPY | |
751 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
752 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
753 | } | |
754 | #endif | |
755 | dh->status = cpu_to_dump32(s, status); | |
756 | ||
757 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
758 | error_setg(errp, "dump: failed to write disk dump header"); | |
759 | goto out; | |
760 | } | |
761 | ||
762 | /* write sub header */ | |
763 | size = sizeof(KdumpSubHeader32); | |
764 | kh = g_malloc0(size); | |
765 | ||
766 | /* 64bit max_mapnr_64 */ | |
767 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); | |
768 | kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); | |
769 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); | |
770 | ||
771 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
772 | kh->offset_note = cpu_to_dump64(s, offset_note); | |
773 | kh->note_size = cpu_to_dump32(s, s->note_size); | |
774 | ||
775 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
776 | block_size, kh, size) < 0) { | |
777 | error_setg(errp, "dump: failed to write kdump sub header"); | |
778 | goto out; | |
779 | } | |
780 | ||
781 | /* write note */ | |
782 | s->note_buf = g_malloc0(s->note_size); | |
783 | s->note_buf_offset = 0; | |
784 | ||
785 | /* use s->note_buf to store notes temporarily */ | |
786 | write_elf32_notes(buf_write_note, s, &local_err); | |
787 | if (local_err) { | |
788 | error_propagate(errp, local_err); | |
789 | goto out; | |
790 | } | |
791 | if (write_buffer(s->fd, offset_note, s->note_buf, | |
792 | s->note_size) < 0) { | |
793 | error_setg(errp, "dump: failed to write notes"); | |
794 | goto out; | |
795 | } | |
796 | ||
797 | /* get offset of dump_bitmap */ | |
798 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
799 | block_size; | |
800 | ||
801 | /* get offset of page */ | |
802 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
803 | block_size; | |
804 | ||
805 | out: | |
806 | g_free(dh); | |
807 | g_free(kh); | |
808 | g_free(s->note_buf); | |
809 | } | |
810 | ||
811 | /* write common header, sub header and elf note to vmcore */ | |
812 | static void create_header64(DumpState *s, Error **errp) | |
813 | { | |
814 | DiskDumpHeader64 *dh = NULL; | |
815 | KdumpSubHeader64 *kh = NULL; | |
816 | size_t size; | |
817 | uint32_t block_size; | |
818 | uint32_t sub_hdr_size; | |
819 | uint32_t bitmap_blocks; | |
820 | uint32_t status = 0; | |
821 | uint64_t offset_note; | |
822 | Error *local_err = NULL; | |
823 | ||
824 | /* write common header, the version of kdump-compressed format is 6th */ | |
825 | size = sizeof(DiskDumpHeader64); | |
826 | dh = g_malloc0(size); | |
827 | ||
828 | strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE)); | |
829 | dh->header_version = cpu_to_dump32(s, 6); | |
830 | block_size = s->dump_info.page_size; | |
831 | dh->block_size = cpu_to_dump32(s, block_size); | |
832 | sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; | |
833 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
834 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); | |
835 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ | |
836 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); | |
837 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
838 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; | |
839 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); | |
840 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); | |
841 | ||
842 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
843 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
844 | } | |
845 | #ifdef CONFIG_LZO | |
846 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
847 | status |= DUMP_DH_COMPRESSED_LZO; | |
848 | } | |
849 | #endif | |
850 | #ifdef CONFIG_SNAPPY | |
851 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
852 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
853 | } | |
854 | #endif | |
855 | dh->status = cpu_to_dump32(s, status); | |
856 | ||
857 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
858 | error_setg(errp, "dump: failed to write disk dump header"); | |
859 | goto out; | |
860 | } | |
861 | ||
862 | /* write sub header */ | |
863 | size = sizeof(KdumpSubHeader64); | |
864 | kh = g_malloc0(size); | |
865 | ||
866 | /* 64bit max_mapnr_64 */ | |
867 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); | |
868 | kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); | |
869 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); | |
870 | ||
871 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
872 | kh->offset_note = cpu_to_dump64(s, offset_note); | |
873 | kh->note_size = cpu_to_dump64(s, s->note_size); | |
874 | ||
875 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
876 | block_size, kh, size) < 0) { | |
877 | error_setg(errp, "dump: failed to write kdump sub header"); | |
878 | goto out; | |
879 | } | |
880 | ||
881 | /* write note */ | |
882 | s->note_buf = g_malloc0(s->note_size); | |
883 | s->note_buf_offset = 0; | |
884 | ||
885 | /* use s->note_buf to store notes temporarily */ | |
886 | write_elf64_notes(buf_write_note, s, &local_err); | |
887 | if (local_err) { | |
888 | error_propagate(errp, local_err); | |
889 | goto out; | |
890 | } | |
891 | ||
892 | if (write_buffer(s->fd, offset_note, s->note_buf, | |
893 | s->note_size) < 0) { | |
894 | error_setg(errp, "dump: failed to write notes"); | |
895 | goto out; | |
896 | } | |
897 | ||
898 | /* get offset of dump_bitmap */ | |
899 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
900 | block_size; | |
901 | ||
902 | /* get offset of page */ | |
903 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
904 | block_size; | |
905 | ||
906 | out: | |
907 | g_free(dh); | |
908 | g_free(kh); | |
909 | g_free(s->note_buf); | |
910 | } | |
911 | ||
912 | static void write_dump_header(DumpState *s, Error **errp) | |
913 | { | |
914 | Error *local_err = NULL; | |
915 | ||
916 | if (s->dump_info.d_class == ELFCLASS32) { | |
917 | create_header32(s, &local_err); | |
918 | } else { | |
919 | create_header64(s, &local_err); | |
920 | } | |
921 | if (local_err) { | |
922 | error_propagate(errp, local_err); | |
923 | } | |
924 | } | |
925 | ||
926 | static size_t dump_bitmap_get_bufsize(DumpState *s) | |
927 | { | |
928 | return s->dump_info.page_size; | |
929 | } | |
930 | ||
931 | /* | |
932 | * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be | |
933 | * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. | |
934 | * set_dump_bitmap will always leave the recently set bit un-sync. And setting | |
935 | * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into | |
936 | * vmcore, ie. synchronizing un-sync bit into vmcore. | |
937 | */ | |
938 | static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, | |
939 | uint8_t *buf, DumpState *s) | |
940 | { | |
941 | off_t old_offset, new_offset; | |
942 | off_t offset_bitmap1, offset_bitmap2; | |
943 | uint32_t byte, bit; | |
944 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); | |
945 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
946 | ||
947 | /* should not set the previous place */ | |
948 | assert(last_pfn <= pfn); | |
949 | ||
950 | /* | |
951 | * if the bit needed to be set is not cached in buf, flush the data in buf | |
952 | * to vmcore firstly. | |
953 | * making new_offset be bigger than old_offset can also sync remained data | |
954 | * into vmcore. | |
955 | */ | |
956 | old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); | |
957 | new_offset = bitmap_bufsize * (pfn / bits_per_buf); | |
958 | ||
959 | while (old_offset < new_offset) { | |
960 | /* calculate the offset and write dump_bitmap */ | |
961 | offset_bitmap1 = s->offset_dump_bitmap + old_offset; | |
962 | if (write_buffer(s->fd, offset_bitmap1, buf, | |
963 | bitmap_bufsize) < 0) { | |
964 | return -1; | |
965 | } | |
966 | ||
967 | /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ | |
968 | offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + | |
969 | old_offset; | |
970 | if (write_buffer(s->fd, offset_bitmap2, buf, | |
971 | bitmap_bufsize) < 0) { | |
972 | return -1; | |
973 | } | |
974 | ||
975 | memset(buf, 0, bitmap_bufsize); | |
976 | old_offset += bitmap_bufsize; | |
977 | } | |
978 | ||
979 | /* get the exact place of the bit in the buf, and set it */ | |
980 | byte = (pfn % bits_per_buf) / CHAR_BIT; | |
981 | bit = (pfn % bits_per_buf) % CHAR_BIT; | |
982 | if (value) { | |
983 | buf[byte] |= 1u << bit; | |
984 | } else { | |
985 | buf[byte] &= ~(1u << bit); | |
986 | } | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
991 | static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) | |
992 | { | |
993 | int target_page_shift = ctz32(s->dump_info.page_size); | |
994 | ||
995 | return (addr >> target_page_shift) - ARCH_PFN_OFFSET; | |
996 | } | |
997 | ||
998 | static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) | |
999 | { | |
1000 | int target_page_shift = ctz32(s->dump_info.page_size); | |
1001 | ||
1002 | return (pfn + ARCH_PFN_OFFSET) << target_page_shift; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * exam every page and return the page frame number and the address of the page. | |
1007 | * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys | |
1008 | * blocks, so block->target_start and block->target_end should be interal | |
1009 | * multiples of the target page size. | |
1010 | */ | |
1011 | static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, | |
1012 | uint8_t **bufptr, DumpState *s) | |
1013 | { | |
1014 | GuestPhysBlock *block = *blockptr; | |
1015 | hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); | |
1016 | uint8_t *buf; | |
1017 | ||
1018 | /* block == NULL means the start of the iteration */ | |
1019 | if (!block) { | |
1020 | block = QTAILQ_FIRST(&s->guest_phys_blocks.head); | |
1021 | *blockptr = block; | |
1022 | assert((block->target_start & ~target_page_mask) == 0); | |
1023 | assert((block->target_end & ~target_page_mask) == 0); | |
1024 | *pfnptr = dump_paddr_to_pfn(s, block->target_start); | |
1025 | if (bufptr) { | |
1026 | *bufptr = block->host_addr; | |
1027 | } | |
1028 | return true; | |
1029 | } | |
1030 | ||
1031 | *pfnptr = *pfnptr + 1; | |
1032 | addr = dump_pfn_to_paddr(s, *pfnptr); | |
1033 | ||
1034 | if ((addr >= block->target_start) && | |
1035 | (addr + s->dump_info.page_size <= block->target_end)) { | |
1036 | buf = block->host_addr + (addr - block->target_start); | |
1037 | } else { | |
1038 | /* the next page is in the next block */ | |
1039 | block = QTAILQ_NEXT(block, next); | |
1040 | *blockptr = block; | |
1041 | if (!block) { | |
1042 | return false; | |
1043 | } | |
1044 | assert((block->target_start & ~target_page_mask) == 0); | |
1045 | assert((block->target_end & ~target_page_mask) == 0); | |
1046 | *pfnptr = dump_paddr_to_pfn(s, block->target_start); | |
1047 | buf = block->host_addr; | |
1048 | } | |
1049 | ||
1050 | if (bufptr) { | |
1051 | *bufptr = buf; | |
1052 | } | |
1053 | ||
1054 | return true; | |
1055 | } | |
1056 | ||
1057 | static void write_dump_bitmap(DumpState *s, Error **errp) | |
1058 | { | |
1059 | int ret = 0; | |
1060 | uint64_t last_pfn, pfn; | |
1061 | void *dump_bitmap_buf; | |
1062 | size_t num_dumpable; | |
1063 | GuestPhysBlock *block_iter = NULL; | |
1064 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); | |
1065 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
1066 | ||
1067 | /* dump_bitmap_buf is used to store dump_bitmap temporarily */ | |
1068 | dump_bitmap_buf = g_malloc0(bitmap_bufsize); | |
1069 | ||
1070 | num_dumpable = 0; | |
1071 | last_pfn = 0; | |
1072 | ||
1073 | /* | |
1074 | * exam memory page by page, and set the bit in dump_bitmap corresponded | |
1075 | * to the existing page. | |
1076 | */ | |
1077 | while (get_next_page(&block_iter, &pfn, NULL, s)) { | |
1078 | ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); | |
1079 | if (ret < 0) { | |
1080 | error_setg(errp, "dump: failed to set dump_bitmap"); | |
1081 | goto out; | |
1082 | } | |
1083 | ||
1084 | last_pfn = pfn; | |
1085 | num_dumpable++; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * set_dump_bitmap will always leave the recently set bit un-sync. Here we | |
1090 | * set the remaining bits from last_pfn to the end of the bitmap buffer to | |
1091 | * 0. With those set, the un-sync bit will be synchronized into the vmcore. | |
1092 | */ | |
1093 | if (num_dumpable > 0) { | |
1094 | ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, | |
1095 | dump_bitmap_buf, s); | |
1096 | if (ret < 0) { | |
1097 | error_setg(errp, "dump: failed to sync dump_bitmap"); | |
1098 | goto out; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* number of dumpable pages that will be dumped later */ | |
1103 | s->num_dumpable = num_dumpable; | |
1104 | ||
1105 | out: | |
1106 | g_free(dump_bitmap_buf); | |
1107 | } | |
1108 | ||
1109 | static void prepare_data_cache(DataCache *data_cache, DumpState *s, | |
1110 | off_t offset) | |
1111 | { | |
1112 | data_cache->fd = s->fd; | |
1113 | data_cache->data_size = 0; | |
1114 | data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); | |
1115 | data_cache->buf = g_malloc0(data_cache->buf_size); | |
1116 | data_cache->offset = offset; | |
1117 | } | |
1118 | ||
1119 | static int write_cache(DataCache *dc, const void *buf, size_t size, | |
1120 | bool flag_sync) | |
1121 | { | |
1122 | /* | |
1123 | * dc->buf_size should not be less than size, otherwise dc will never be | |
1124 | * enough | |
1125 | */ | |
1126 | assert(size <= dc->buf_size); | |
1127 | ||
1128 | /* | |
1129 | * if flag_sync is set, synchronize data in dc->buf into vmcore. | |
1130 | * otherwise check if the space is enough for caching data in buf, if not, | |
1131 | * write the data in dc->buf to dc->fd and reset dc->buf | |
1132 | */ | |
1133 | if ((!flag_sync && dc->data_size + size > dc->buf_size) || | |
1134 | (flag_sync && dc->data_size > 0)) { | |
1135 | if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { | |
1136 | return -1; | |
1137 | } | |
1138 | ||
1139 | dc->offset += dc->data_size; | |
1140 | dc->data_size = 0; | |
1141 | } | |
1142 | ||
1143 | if (!flag_sync) { | |
1144 | memcpy(dc->buf + dc->data_size, buf, size); | |
1145 | dc->data_size += size; | |
1146 | } | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | static void free_data_cache(DataCache *data_cache) | |
1152 | { | |
1153 | g_free(data_cache->buf); | |
1154 | } | |
1155 | ||
1156 | static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) | |
1157 | { | |
1158 | switch (flag_compress) { | |
1159 | case DUMP_DH_COMPRESSED_ZLIB: | |
1160 | return compressBound(page_size); | |
1161 | ||
1162 | case DUMP_DH_COMPRESSED_LZO: | |
1163 | /* | |
1164 | * LZO will expand incompressible data by a little amount. Please check | |
1165 | * the following URL to see the expansion calculation: | |
1166 | * http://www.oberhumer.com/opensource/lzo/lzofaq.php | |
1167 | */ | |
1168 | return page_size + page_size / 16 + 64 + 3; | |
1169 | ||
1170 | #ifdef CONFIG_SNAPPY | |
1171 | case DUMP_DH_COMPRESSED_SNAPPY: | |
1172 | return snappy_max_compressed_length(page_size); | |
1173 | #endif | |
1174 | } | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * check if the page is all 0 | |
1180 | */ | |
1181 | static inline bool is_zero_page(const uint8_t *buf, size_t page_size) | |
1182 | { | |
1183 | return buffer_is_zero(buf, page_size); | |
1184 | } | |
1185 | ||
1186 | static void write_dump_pages(DumpState *s, Error **errp) | |
1187 | { | |
1188 | int ret = 0; | |
1189 | DataCache page_desc, page_data; | |
1190 | size_t len_buf_out, size_out; | |
1191 | #ifdef CONFIG_LZO | |
1192 | lzo_bytep wrkmem = NULL; | |
1193 | #endif | |
1194 | uint8_t *buf_out = NULL; | |
1195 | off_t offset_desc, offset_data; | |
1196 | PageDescriptor pd, pd_zero; | |
1197 | uint8_t *buf; | |
1198 | GuestPhysBlock *block_iter = NULL; | |
1199 | uint64_t pfn_iter; | |
1200 | ||
1201 | /* get offset of page_desc and page_data in dump file */ | |
1202 | offset_desc = s->offset_page; | |
1203 | offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; | |
1204 | ||
1205 | prepare_data_cache(&page_desc, s, offset_desc); | |
1206 | prepare_data_cache(&page_data, s, offset_data); | |
1207 | ||
1208 | /* prepare buffer to store compressed data */ | |
1209 | len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); | |
1210 | assert(len_buf_out != 0); | |
1211 | ||
1212 | #ifdef CONFIG_LZO | |
1213 | wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); | |
1214 | #endif | |
1215 | ||
1216 | buf_out = g_malloc(len_buf_out); | |
1217 | ||
1218 | /* | |
1219 | * init zero page's page_desc and page_data, because every zero page | |
1220 | * uses the same page_data | |
1221 | */ | |
1222 | pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); | |
1223 | pd_zero.flags = cpu_to_dump32(s, 0); | |
1224 | pd_zero.offset = cpu_to_dump64(s, offset_data); | |
1225 | pd_zero.page_flags = cpu_to_dump64(s, 0); | |
1226 | buf = g_malloc0(s->dump_info.page_size); | |
1227 | ret = write_cache(&page_data, buf, s->dump_info.page_size, false); | |
1228 | g_free(buf); | |
1229 | if (ret < 0) { | |
1230 | error_setg(errp, "dump: failed to write page data (zero page)"); | |
1231 | goto out; | |
1232 | } | |
1233 | ||
1234 | offset_data += s->dump_info.page_size; | |
1235 | ||
1236 | /* | |
1237 | * dump memory to vmcore page by page. zero page will all be resided in the | |
1238 | * first page of page section | |
1239 | */ | |
1240 | while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { | |
1241 | /* check zero page */ | |
1242 | if (is_zero_page(buf, s->dump_info.page_size)) { | |
1243 | ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), | |
1244 | false); | |
1245 | if (ret < 0) { | |
1246 | error_setg(errp, "dump: failed to write page desc"); | |
1247 | goto out; | |
1248 | } | |
1249 | } else { | |
1250 | /* | |
1251 | * not zero page, then: | |
1252 | * 1. compress the page | |
1253 | * 2. write the compressed page into the cache of page_data | |
1254 | * 3. get page desc of the compressed page and write it into the | |
1255 | * cache of page_desc | |
1256 | * | |
1257 | * only one compression format will be used here, for | |
1258 | * s->flag_compress is set. But when compression fails to work, | |
1259 | * we fall back to save in plaintext. | |
1260 | */ | |
1261 | size_out = len_buf_out; | |
1262 | if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && | |
1263 | (compress2(buf_out, (uLongf *)&size_out, buf, | |
1264 | s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && | |
1265 | (size_out < s->dump_info.page_size)) { | |
1266 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); | |
1267 | pd.size = cpu_to_dump32(s, size_out); | |
1268 | ||
1269 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1270 | if (ret < 0) { | |
1271 | error_setg(errp, "dump: failed to write page data"); | |
1272 | goto out; | |
1273 | } | |
1274 | #ifdef CONFIG_LZO | |
1275 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && | |
1276 | (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, | |
1277 | (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && | |
1278 | (size_out < s->dump_info.page_size)) { | |
1279 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); | |
1280 | pd.size = cpu_to_dump32(s, size_out); | |
1281 | ||
1282 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1283 | if (ret < 0) { | |
1284 | error_setg(errp, "dump: failed to write page data"); | |
1285 | goto out; | |
1286 | } | |
1287 | #endif | |
1288 | #ifdef CONFIG_SNAPPY | |
1289 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && | |
1290 | (snappy_compress((char *)buf, s->dump_info.page_size, | |
1291 | (char *)buf_out, &size_out) == SNAPPY_OK) && | |
1292 | (size_out < s->dump_info.page_size)) { | |
1293 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); | |
1294 | pd.size = cpu_to_dump32(s, size_out); | |
1295 | ||
1296 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1297 | if (ret < 0) { | |
1298 | error_setg(errp, "dump: failed to write page data"); | |
1299 | goto out; | |
1300 | } | |
1301 | #endif | |
1302 | } else { | |
1303 | /* | |
1304 | * fall back to save in plaintext, size_out should be | |
1305 | * assigned the target's page size | |
1306 | */ | |
1307 | pd.flags = cpu_to_dump32(s, 0); | |
1308 | size_out = s->dump_info.page_size; | |
1309 | pd.size = cpu_to_dump32(s, size_out); | |
1310 | ||
1311 | ret = write_cache(&page_data, buf, | |
1312 | s->dump_info.page_size, false); | |
1313 | if (ret < 0) { | |
1314 | error_setg(errp, "dump: failed to write page data"); | |
1315 | goto out; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | /* get and write page desc here */ | |
1320 | pd.page_flags = cpu_to_dump64(s, 0); | |
1321 | pd.offset = cpu_to_dump64(s, offset_data); | |
1322 | offset_data += size_out; | |
1323 | ||
1324 | ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); | |
1325 | if (ret < 0) { | |
1326 | error_setg(errp, "dump: failed to write page desc"); | |
1327 | goto out; | |
1328 | } | |
1329 | } | |
1330 | s->written_size += s->dump_info.page_size; | |
1331 | } | |
1332 | ||
1333 | ret = write_cache(&page_desc, NULL, 0, true); | |
1334 | if (ret < 0) { | |
1335 | error_setg(errp, "dump: failed to sync cache for page_desc"); | |
1336 | goto out; | |
1337 | } | |
1338 | ret = write_cache(&page_data, NULL, 0, true); | |
1339 | if (ret < 0) { | |
1340 | error_setg(errp, "dump: failed to sync cache for page_data"); | |
1341 | goto out; | |
1342 | } | |
1343 | ||
1344 | out: | |
1345 | free_data_cache(&page_desc); | |
1346 | free_data_cache(&page_data); | |
1347 | ||
1348 | #ifdef CONFIG_LZO | |
1349 | g_free(wrkmem); | |
1350 | #endif | |
1351 | ||
1352 | g_free(buf_out); | |
1353 | } | |
1354 | ||
1355 | static void create_kdump_vmcore(DumpState *s, Error **errp) | |
1356 | { | |
1357 | int ret; | |
1358 | Error *local_err = NULL; | |
1359 | ||
1360 | /* | |
1361 | * the kdump-compressed format is: | |
1362 | * File offset | |
1363 | * +------------------------------------------+ 0x0 | |
1364 | * | main header (struct disk_dump_header) | | |
1365 | * |------------------------------------------+ block 1 | |
1366 | * | sub header (struct kdump_sub_header) | | |
1367 | * |------------------------------------------+ block 2 | |
1368 | * | 1st-dump_bitmap | | |
1369 | * |------------------------------------------+ block 2 + X blocks | |
1370 | * | 2nd-dump_bitmap | (aligned by block) | |
1371 | * |------------------------------------------+ block 2 + 2 * X blocks | |
1372 | * | page desc for pfn 0 (struct page_desc) | (aligned by block) | |
1373 | * | page desc for pfn 1 (struct page_desc) | | |
1374 | * | : | | |
1375 | * |------------------------------------------| (not aligned by block) | |
1376 | * | page data (pfn 0) | | |
1377 | * | page data (pfn 1) | | |
1378 | * | : | | |
1379 | * +------------------------------------------+ | |
1380 | */ | |
1381 | ||
1382 | ret = write_start_flat_header(s->fd); | |
1383 | if (ret < 0) { | |
1384 | error_setg(errp, "dump: failed to write start flat header"); | |
1385 | return; | |
1386 | } | |
1387 | ||
1388 | write_dump_header(s, &local_err); | |
1389 | if (local_err) { | |
1390 | error_propagate(errp, local_err); | |
1391 | return; | |
1392 | } | |
1393 | ||
1394 | write_dump_bitmap(s, &local_err); | |
1395 | if (local_err) { | |
1396 | error_propagate(errp, local_err); | |
1397 | return; | |
1398 | } | |
1399 | ||
1400 | write_dump_pages(s, &local_err); | |
1401 | if (local_err) { | |
1402 | error_propagate(errp, local_err); | |
1403 | return; | |
1404 | } | |
1405 | ||
1406 | ret = write_end_flat_header(s->fd); | |
1407 | if (ret < 0) { | |
1408 | error_setg(errp, "dump: failed to write end flat header"); | |
1409 | return; | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | static ram_addr_t get_start_block(DumpState *s) | |
1414 | { | |
1415 | GuestPhysBlock *block; | |
1416 | ||
1417 | if (!s->has_filter) { | |
1418 | s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); | |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
1423 | if (block->target_start >= s->begin + s->length || | |
1424 | block->target_end <= s->begin) { | |
1425 | /* This block is out of the range */ | |
1426 | continue; | |
1427 | } | |
1428 | ||
1429 | s->next_block = block; | |
1430 | if (s->begin > block->target_start) { | |
1431 | s->start = s->begin - block->target_start; | |
1432 | } else { | |
1433 | s->start = 0; | |
1434 | } | |
1435 | return s->start; | |
1436 | } | |
1437 | ||
1438 | return -1; | |
1439 | } | |
1440 | ||
1441 | static void get_max_mapnr(DumpState *s) | |
1442 | { | |
1443 | GuestPhysBlock *last_block; | |
1444 | ||
1445 | last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead); | |
1446 | s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); | |
1447 | } | |
1448 | ||
1449 | static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; | |
1450 | ||
1451 | static void dump_state_prepare(DumpState *s) | |
1452 | { | |
1453 | /* zero the struct, setting status to active */ | |
1454 | *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; | |
1455 | } | |
1456 | ||
1457 | bool dump_in_progress(void) | |
1458 | { | |
1459 | DumpState *state = &dump_state_global; | |
1460 | return (atomic_read(&state->status) == DUMP_STATUS_ACTIVE); | |
1461 | } | |
1462 | ||
1463 | /* calculate total size of memory to be dumped (taking filter into | |
1464 | * acoount.) */ | |
1465 | static int64_t dump_calculate_size(DumpState *s) | |
1466 | { | |
1467 | GuestPhysBlock *block; | |
1468 | int64_t size = 0, total = 0, left = 0, right = 0; | |
1469 | ||
1470 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
1471 | if (s->has_filter) { | |
1472 | /* calculate the overlapped region. */ | |
1473 | left = MAX(s->begin, block->target_start); | |
1474 | right = MIN(s->begin + s->length, block->target_end); | |
1475 | size = right - left; | |
1476 | size = size > 0 ? size : 0; | |
1477 | } else { | |
1478 | /* count the whole region in */ | |
1479 | size = (block->target_end - block->target_start); | |
1480 | } | |
1481 | total += size; | |
1482 | } | |
1483 | ||
1484 | return total; | |
1485 | } | |
1486 | ||
1487 | static void dump_init(DumpState *s, int fd, bool has_format, | |
1488 | DumpGuestMemoryFormat format, bool paging, bool has_filter, | |
1489 | int64_t begin, int64_t length, Error **errp) | |
1490 | { | |
1491 | CPUState *cpu; | |
1492 | int nr_cpus; | |
1493 | Error *err = NULL; | |
1494 | int ret; | |
1495 | ||
1496 | s->has_format = has_format; | |
1497 | s->format = format; | |
1498 | s->written_size = 0; | |
1499 | ||
1500 | /* kdump-compressed is conflict with paging and filter */ | |
1501 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1502 | assert(!paging && !has_filter); | |
1503 | } | |
1504 | ||
1505 | if (runstate_is_running()) { | |
1506 | vm_stop(RUN_STATE_SAVE_VM); | |
1507 | s->resume = true; | |
1508 | } else { | |
1509 | s->resume = false; | |
1510 | } | |
1511 | ||
1512 | /* If we use KVM, we should synchronize the registers before we get dump | |
1513 | * info or physmap info. | |
1514 | */ | |
1515 | cpu_synchronize_all_states(); | |
1516 | nr_cpus = 0; | |
1517 | CPU_FOREACH(cpu) { | |
1518 | nr_cpus++; | |
1519 | } | |
1520 | ||
1521 | s->fd = fd; | |
1522 | s->has_filter = has_filter; | |
1523 | s->begin = begin; | |
1524 | s->length = length; | |
1525 | ||
1526 | memory_mapping_list_init(&s->list); | |
1527 | ||
1528 | guest_phys_blocks_init(&s->guest_phys_blocks); | |
1529 | guest_phys_blocks_append(&s->guest_phys_blocks); | |
1530 | s->total_size = dump_calculate_size(s); | |
1531 | #ifdef DEBUG_DUMP_GUEST_MEMORY | |
1532 | fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); | |
1533 | #endif | |
1534 | ||
1535 | s->start = get_start_block(s); | |
1536 | if (s->start == -1) { | |
1537 | error_setg(errp, QERR_INVALID_PARAMETER, "begin"); | |
1538 | goto cleanup; | |
1539 | } | |
1540 | ||
1541 | /* get dump info: endian, class and architecture. | |
1542 | * If the target architecture is not supported, cpu_get_dump_info() will | |
1543 | * return -1. | |
1544 | */ | |
1545 | ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); | |
1546 | if (ret < 0) { | |
1547 | error_setg(errp, QERR_UNSUPPORTED); | |
1548 | goto cleanup; | |
1549 | } | |
1550 | ||
1551 | if (!s->dump_info.page_size) { | |
1552 | s->dump_info.page_size = TARGET_PAGE_SIZE; | |
1553 | } | |
1554 | ||
1555 | s->note_size = cpu_get_note_size(s->dump_info.d_class, | |
1556 | s->dump_info.d_machine, nr_cpus); | |
1557 | if (s->note_size < 0) { | |
1558 | error_setg(errp, QERR_UNSUPPORTED); | |
1559 | goto cleanup; | |
1560 | } | |
1561 | ||
1562 | /* get memory mapping */ | |
1563 | if (paging) { | |
1564 | qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err); | |
1565 | if (err != NULL) { | |
1566 | error_propagate(errp, err); | |
1567 | goto cleanup; | |
1568 | } | |
1569 | } else { | |
1570 | qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); | |
1571 | } | |
1572 | ||
1573 | s->nr_cpus = nr_cpus; | |
1574 | ||
1575 | get_max_mapnr(s); | |
1576 | ||
1577 | uint64_t tmp; | |
1578 | tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), | |
1579 | s->dump_info.page_size); | |
1580 | s->len_dump_bitmap = tmp * s->dump_info.page_size; | |
1581 | ||
1582 | /* init for kdump-compressed format */ | |
1583 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1584 | switch (format) { | |
1585 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: | |
1586 | s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; | |
1587 | break; | |
1588 | ||
1589 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: | |
1590 | #ifdef CONFIG_LZO | |
1591 | if (lzo_init() != LZO_E_OK) { | |
1592 | error_setg(errp, "failed to initialize the LZO library"); | |
1593 | goto cleanup; | |
1594 | } | |
1595 | #endif | |
1596 | s->flag_compress = DUMP_DH_COMPRESSED_LZO; | |
1597 | break; | |
1598 | ||
1599 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: | |
1600 | s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; | |
1601 | break; | |
1602 | ||
1603 | default: | |
1604 | s->flag_compress = 0; | |
1605 | } | |
1606 | ||
1607 | return; | |
1608 | } | |
1609 | ||
1610 | if (s->has_filter) { | |
1611 | memory_mapping_filter(&s->list, s->begin, s->length); | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * calculate phdr_num | |
1616 | * | |
1617 | * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow | |
1618 | */ | |
1619 | s->phdr_num = 1; /* PT_NOTE */ | |
1620 | if (s->list.num < UINT16_MAX - 2) { | |
1621 | s->phdr_num += s->list.num; | |
1622 | s->have_section = false; | |
1623 | } else { | |
1624 | s->have_section = true; | |
1625 | s->phdr_num = PN_XNUM; | |
1626 | s->sh_info = 1; /* PT_NOTE */ | |
1627 | ||
1628 | /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ | |
1629 | if (s->list.num <= UINT32_MAX - 1) { | |
1630 | s->sh_info += s->list.num; | |
1631 | } else { | |
1632 | s->sh_info = UINT32_MAX; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | if (s->dump_info.d_class == ELFCLASS64) { | |
1637 | if (s->have_section) { | |
1638 | s->memory_offset = sizeof(Elf64_Ehdr) + | |
1639 | sizeof(Elf64_Phdr) * s->sh_info + | |
1640 | sizeof(Elf64_Shdr) + s->note_size; | |
1641 | } else { | |
1642 | s->memory_offset = sizeof(Elf64_Ehdr) + | |
1643 | sizeof(Elf64_Phdr) * s->phdr_num + s->note_size; | |
1644 | } | |
1645 | } else { | |
1646 | if (s->have_section) { | |
1647 | s->memory_offset = sizeof(Elf32_Ehdr) + | |
1648 | sizeof(Elf32_Phdr) * s->sh_info + | |
1649 | sizeof(Elf32_Shdr) + s->note_size; | |
1650 | } else { | |
1651 | s->memory_offset = sizeof(Elf32_Ehdr) + | |
1652 | sizeof(Elf32_Phdr) * s->phdr_num + s->note_size; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | return; | |
1657 | ||
1658 | cleanup: | |
1659 | dump_cleanup(s); | |
1660 | } | |
1661 | ||
1662 | /* this operation might be time consuming. */ | |
1663 | static void dump_process(DumpState *s, Error **errp) | |
1664 | { | |
1665 | Error *local_err = NULL; | |
1666 | DumpQueryResult *result = NULL; | |
1667 | ||
1668 | if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1669 | create_kdump_vmcore(s, &local_err); | |
1670 | } else { | |
1671 | create_vmcore(s, &local_err); | |
1672 | } | |
1673 | ||
1674 | /* make sure status is written after written_size updates */ | |
1675 | smp_wmb(); | |
1676 | atomic_set(&s->status, | |
1677 | (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); | |
1678 | ||
1679 | /* send DUMP_COMPLETED message (unconditionally) */ | |
1680 | result = qmp_query_dump(NULL); | |
1681 | /* should never fail */ | |
1682 | assert(result); | |
1683 | qapi_event_send_dump_completed(result, !!local_err, (local_err ? \ | |
1684 | error_get_pretty(local_err) : NULL), | |
1685 | &error_abort); | |
1686 | qapi_free_DumpQueryResult(result); | |
1687 | ||
1688 | error_propagate(errp, local_err); | |
1689 | dump_cleanup(s); | |
1690 | } | |
1691 | ||
1692 | static void *dump_thread(void *data) | |
1693 | { | |
1694 | Error *err = NULL; | |
1695 | DumpState *s = (DumpState *)data; | |
1696 | dump_process(s, &err); | |
1697 | error_free(err); | |
1698 | return NULL; | |
1699 | } | |
1700 | ||
1701 | DumpQueryResult *qmp_query_dump(Error **errp) | |
1702 | { | |
1703 | DumpQueryResult *result = g_new(DumpQueryResult, 1); | |
1704 | DumpState *state = &dump_state_global; | |
1705 | result->status = atomic_read(&state->status); | |
1706 | /* make sure we are reading status and written_size in order */ | |
1707 | smp_rmb(); | |
1708 | result->completed = state->written_size; | |
1709 | result->total = state->total_size; | |
1710 | return result; | |
1711 | } | |
1712 | ||
1713 | void qmp_dump_guest_memory(bool paging, const char *file, | |
1714 | bool has_detach, bool detach, | |
1715 | bool has_begin, int64_t begin, bool has_length, | |
1716 | int64_t length, bool has_format, | |
1717 | DumpGuestMemoryFormat format, Error **errp) | |
1718 | { | |
1719 | const char *p; | |
1720 | int fd = -1; | |
1721 | DumpState *s; | |
1722 | Error *local_err = NULL; | |
1723 | bool detach_p = false; | |
1724 | ||
1725 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1726 | error_setg(errp, "Dump not allowed during incoming migration."); | |
1727 | return; | |
1728 | } | |
1729 | ||
1730 | /* if there is a dump in background, we should wait until the dump | |
1731 | * finished */ | |
1732 | if (dump_in_progress()) { | |
1733 | error_setg(errp, "There is a dump in process, please wait."); | |
1734 | return; | |
1735 | } | |
1736 | ||
1737 | /* | |
1738 | * kdump-compressed format need the whole memory dumped, so paging or | |
1739 | * filter is not supported here. | |
1740 | */ | |
1741 | if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && | |
1742 | (paging || has_begin || has_length)) { | |
1743 | error_setg(errp, "kdump-compressed format doesn't support paging or " | |
1744 | "filter"); | |
1745 | return; | |
1746 | } | |
1747 | if (has_begin && !has_length) { | |
1748 | error_setg(errp, QERR_MISSING_PARAMETER, "length"); | |
1749 | return; | |
1750 | } | |
1751 | if (!has_begin && has_length) { | |
1752 | error_setg(errp, QERR_MISSING_PARAMETER, "begin"); | |
1753 | return; | |
1754 | } | |
1755 | if (has_detach) { | |
1756 | detach_p = detach; | |
1757 | } | |
1758 | ||
1759 | /* check whether lzo/snappy is supported */ | |
1760 | #ifndef CONFIG_LZO | |
1761 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { | |
1762 | error_setg(errp, "kdump-lzo is not available now"); | |
1763 | return; | |
1764 | } | |
1765 | #endif | |
1766 | ||
1767 | #ifndef CONFIG_SNAPPY | |
1768 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { | |
1769 | error_setg(errp, "kdump-snappy is not available now"); | |
1770 | return; | |
1771 | } | |
1772 | #endif | |
1773 | ||
1774 | #if !defined(WIN32) | |
1775 | if (strstart(file, "fd:", &p)) { | |
1776 | fd = monitor_get_fd(cur_mon, p, errp); | |
1777 | if (fd == -1) { | |
1778 | return; | |
1779 | } | |
1780 | } | |
1781 | #endif | |
1782 | ||
1783 | if (strstart(file, "file:", &p)) { | |
1784 | fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); | |
1785 | if (fd < 0) { | |
1786 | error_setg_file_open(errp, errno, p); | |
1787 | return; | |
1788 | } | |
1789 | } | |
1790 | ||
1791 | if (fd == -1) { | |
1792 | error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); | |
1793 | return; | |
1794 | } | |
1795 | ||
1796 | s = &dump_state_global; | |
1797 | dump_state_prepare(s); | |
1798 | ||
1799 | dump_init(s, fd, has_format, format, paging, has_begin, | |
1800 | begin, length, &local_err); | |
1801 | if (local_err) { | |
1802 | error_propagate(errp, local_err); | |
1803 | atomic_set(&s->status, DUMP_STATUS_FAILED); | |
1804 | return; | |
1805 | } | |
1806 | ||
1807 | if (detach_p) { | |
1808 | /* detached dump */ | |
1809 | qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, | |
1810 | s, QEMU_THREAD_DETACHED); | |
1811 | } else { | |
1812 | /* sync dump */ | |
1813 | dump_process(s, errp); | |
1814 | } | |
1815 | } | |
1816 | ||
1817 | DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) | |
1818 | { | |
1819 | DumpGuestMemoryFormatList *item; | |
1820 | DumpGuestMemoryCapability *cap = | |
1821 | g_malloc0(sizeof(DumpGuestMemoryCapability)); | |
1822 | ||
1823 | /* elf is always available */ | |
1824 | item = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
1825 | cap->formats = item; | |
1826 | item->value = DUMP_GUEST_MEMORY_FORMAT_ELF; | |
1827 | ||
1828 | /* kdump-zlib is always available */ | |
1829 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
1830 | item = item->next; | |
1831 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB; | |
1832 | ||
1833 | /* add new item if kdump-lzo is available */ | |
1834 | #ifdef CONFIG_LZO | |
1835 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
1836 | item = item->next; | |
1837 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO; | |
1838 | #endif | |
1839 | ||
1840 | /* add new item if kdump-snappy is available */ | |
1841 | #ifdef CONFIG_SNAPPY | |
1842 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
1843 | item = item->next; | |
1844 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY; | |
1845 | #endif | |
1846 | ||
1847 | return cap; | |
1848 | } |