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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/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 "qapi/qapi-commands-misc.h" | |
27 | #include "qapi/qapi-events-misc.h" | |
28 | #include "qapi/qmp/qerror.h" | |
29 | #include "qemu/error-report.h" | |
30 | #include "hw/misc/vmcoreinfo.h" | |
31 | ||
32 | #ifdef TARGET_X86_64 | |
33 | #include "win_dump.h" | |
34 | #endif | |
35 | ||
36 | #include <zlib.h> | |
37 | #ifdef CONFIG_LZO | |
38 | #include <lzo/lzo1x.h> | |
39 | #endif | |
40 | #ifdef CONFIG_SNAPPY | |
41 | #include <snappy-c.h> | |
42 | #endif | |
43 | #ifndef ELF_MACHINE_UNAME | |
44 | #define ELF_MACHINE_UNAME "Unknown" | |
45 | #endif | |
46 | ||
47 | #define MAX_GUEST_NOTE_SIZE (1 << 20) /* 1MB should be enough */ | |
48 | ||
49 | #define ELF_NOTE_SIZE(hdr_size, name_size, desc_size) \ | |
50 | ((DIV_ROUND_UP((hdr_size), 4) + \ | |
51 | DIV_ROUND_UP((name_size), 4) + \ | |
52 | DIV_ROUND_UP((desc_size), 4)) * 4) | |
53 | ||
54 | uint16_t cpu_to_dump16(DumpState *s, uint16_t val) | |
55 | { | |
56 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
57 | val = cpu_to_le16(val); | |
58 | } else { | |
59 | val = cpu_to_be16(val); | |
60 | } | |
61 | ||
62 | return val; | |
63 | } | |
64 | ||
65 | uint32_t cpu_to_dump32(DumpState *s, uint32_t val) | |
66 | { | |
67 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
68 | val = cpu_to_le32(val); | |
69 | } else { | |
70 | val = cpu_to_be32(val); | |
71 | } | |
72 | ||
73 | return val; | |
74 | } | |
75 | ||
76 | uint64_t cpu_to_dump64(DumpState *s, uint64_t val) | |
77 | { | |
78 | if (s->dump_info.d_endian == ELFDATA2LSB) { | |
79 | val = cpu_to_le64(val); | |
80 | } else { | |
81 | val = cpu_to_be64(val); | |
82 | } | |
83 | ||
84 | return val; | |
85 | } | |
86 | ||
87 | static int dump_cleanup(DumpState *s) | |
88 | { | |
89 | guest_phys_blocks_free(&s->guest_phys_blocks); | |
90 | memory_mapping_list_free(&s->list); | |
91 | close(s->fd); | |
92 | g_free(s->guest_note); | |
93 | s->guest_note = NULL; | |
94 | if (s->resume) { | |
95 | if (s->detached) { | |
96 | qemu_mutex_lock_iothread(); | |
97 | } | |
98 | vm_start(); | |
99 | if (s->detached) { | |
100 | qemu_mutex_unlock_iothread(); | |
101 | } | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int fd_write_vmcore(const void *buf, size_t size, void *opaque) | |
108 | { | |
109 | DumpState *s = opaque; | |
110 | size_t written_size; | |
111 | ||
112 | written_size = qemu_write_full(s->fd, buf, size); | |
113 | if (written_size != size) { | |
114 | return -errno; | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static void write_elf64_header(DumpState *s, Error **errp) | |
121 | { | |
122 | Elf64_Ehdr elf_header; | |
123 | int ret; | |
124 | ||
125 | memset(&elf_header, 0, sizeof(Elf64_Ehdr)); | |
126 | memcpy(&elf_header, ELFMAG, SELFMAG); | |
127 | elf_header.e_ident[EI_CLASS] = ELFCLASS64; | |
128 | elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; | |
129 | elf_header.e_ident[EI_VERSION] = EV_CURRENT; | |
130 | elf_header.e_type = cpu_to_dump16(s, ET_CORE); | |
131 | elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
132 | elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); | |
133 | elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
134 | elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr)); | |
135 | elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); | |
136 | elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); | |
137 | if (s->have_section) { | |
138 | uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info; | |
139 | ||
140 | elf_header.e_shoff = cpu_to_dump64(s, shoff); | |
141 | elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); | |
142 | elf_header.e_shnum = cpu_to_dump16(s, 1); | |
143 | } | |
144 | ||
145 | ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); | |
146 | if (ret < 0) { | |
147 | error_setg_errno(errp, -ret, "dump: failed to write elf header"); | |
148 | } | |
149 | } | |
150 | ||
151 | static void write_elf32_header(DumpState *s, Error **errp) | |
152 | { | |
153 | Elf32_Ehdr elf_header; | |
154 | int ret; | |
155 | ||
156 | memset(&elf_header, 0, sizeof(Elf32_Ehdr)); | |
157 | memcpy(&elf_header, ELFMAG, SELFMAG); | |
158 | elf_header.e_ident[EI_CLASS] = ELFCLASS32; | |
159 | elf_header.e_ident[EI_DATA] = s->dump_info.d_endian; | |
160 | elf_header.e_ident[EI_VERSION] = EV_CURRENT; | |
161 | elf_header.e_type = cpu_to_dump16(s, ET_CORE); | |
162 | elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
163 | elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); | |
164 | elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
165 | elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr)); | |
166 | elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); | |
167 | elf_header.e_phnum = cpu_to_dump16(s, s->phdr_num); | |
168 | if (s->have_section) { | |
169 | uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info; | |
170 | ||
171 | elf_header.e_shoff = cpu_to_dump32(s, shoff); | |
172 | elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); | |
173 | elf_header.e_shnum = cpu_to_dump16(s, 1); | |
174 | } | |
175 | ||
176 | ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); | |
177 | if (ret < 0) { | |
178 | error_setg_errno(errp, -ret, "dump: failed to write elf header"); | |
179 | } | |
180 | } | |
181 | ||
182 | static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, | |
183 | int phdr_index, hwaddr offset, | |
184 | hwaddr filesz, Error **errp) | |
185 | { | |
186 | Elf64_Phdr phdr; | |
187 | int ret; | |
188 | ||
189 | memset(&phdr, 0, sizeof(Elf64_Phdr)); | |
190 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); | |
191 | phdr.p_offset = cpu_to_dump64(s, offset); | |
192 | phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); | |
193 | phdr.p_filesz = cpu_to_dump64(s, filesz); | |
194 | phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); | |
195 | phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; | |
196 | ||
197 | assert(memory_mapping->length >= filesz); | |
198 | ||
199 | ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); | |
200 | if (ret < 0) { | |
201 | error_setg_errno(errp, -ret, | |
202 | "dump: failed to write program header table"); | |
203 | } | |
204 | } | |
205 | ||
206 | static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, | |
207 | int phdr_index, hwaddr offset, | |
208 | hwaddr filesz, Error **errp) | |
209 | { | |
210 | Elf32_Phdr phdr; | |
211 | int ret; | |
212 | ||
213 | memset(&phdr, 0, sizeof(Elf32_Phdr)); | |
214 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); | |
215 | phdr.p_offset = cpu_to_dump32(s, offset); | |
216 | phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); | |
217 | phdr.p_filesz = cpu_to_dump32(s, filesz); | |
218 | phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); | |
219 | phdr.p_vaddr = | |
220 | cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; | |
221 | ||
222 | assert(memory_mapping->length >= filesz); | |
223 | ||
224 | ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); | |
225 | if (ret < 0) { | |
226 | error_setg_errno(errp, -ret, | |
227 | "dump: failed to write program header table"); | |
228 | } | |
229 | } | |
230 | ||
231 | static void write_elf64_note(DumpState *s, Error **errp) | |
232 | { | |
233 | Elf64_Phdr phdr; | |
234 | hwaddr begin = s->memory_offset - s->note_size; | |
235 | int ret; | |
236 | ||
237 | memset(&phdr, 0, sizeof(Elf64_Phdr)); | |
238 | phdr.p_type = cpu_to_dump32(s, PT_NOTE); | |
239 | phdr.p_offset = cpu_to_dump64(s, begin); | |
240 | phdr.p_paddr = 0; | |
241 | phdr.p_filesz = cpu_to_dump64(s, s->note_size); | |
242 | phdr.p_memsz = cpu_to_dump64(s, s->note_size); | |
243 | phdr.p_vaddr = 0; | |
244 | ||
245 | ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); | |
246 | if (ret < 0) { | |
247 | error_setg_errno(errp, -ret, | |
248 | "dump: failed to write program header table"); | |
249 | } | |
250 | } | |
251 | ||
252 | static inline int cpu_index(CPUState *cpu) | |
253 | { | |
254 | return cpu->cpu_index + 1; | |
255 | } | |
256 | ||
257 | static void write_guest_note(WriteCoreDumpFunction f, DumpState *s, | |
258 | Error **errp) | |
259 | { | |
260 | int ret; | |
261 | ||
262 | if (s->guest_note) { | |
263 | ret = f(s->guest_note, s->guest_note_size, s); | |
264 | if (ret < 0) { | |
265 | error_setg(errp, "dump: failed to write guest note"); | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, | |
271 | Error **errp) | |
272 | { | |
273 | CPUState *cpu; | |
274 | int ret; | |
275 | int id; | |
276 | ||
277 | CPU_FOREACH(cpu) { | |
278 | id = cpu_index(cpu); | |
279 | ret = cpu_write_elf64_note(f, cpu, id, s); | |
280 | if (ret < 0) { | |
281 | error_setg(errp, "dump: failed to write elf notes"); | |
282 | return; | |
283 | } | |
284 | } | |
285 | ||
286 | CPU_FOREACH(cpu) { | |
287 | ret = cpu_write_elf64_qemunote(f, cpu, s); | |
288 | if (ret < 0) { | |
289 | error_setg(errp, "dump: failed to write CPU status"); | |
290 | return; | |
291 | } | |
292 | } | |
293 | ||
294 | write_guest_note(f, s, errp); | |
295 | } | |
296 | ||
297 | static void write_elf32_note(DumpState *s, Error **errp) | |
298 | { | |
299 | hwaddr begin = s->memory_offset - s->note_size; | |
300 | Elf32_Phdr phdr; | |
301 | int ret; | |
302 | ||
303 | memset(&phdr, 0, sizeof(Elf32_Phdr)); | |
304 | phdr.p_type = cpu_to_dump32(s, PT_NOTE); | |
305 | phdr.p_offset = cpu_to_dump32(s, begin); | |
306 | phdr.p_paddr = 0; | |
307 | phdr.p_filesz = cpu_to_dump32(s, s->note_size); | |
308 | phdr.p_memsz = cpu_to_dump32(s, s->note_size); | |
309 | phdr.p_vaddr = 0; | |
310 | ||
311 | ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); | |
312 | if (ret < 0) { | |
313 | error_setg_errno(errp, -ret, | |
314 | "dump: failed to write program header table"); | |
315 | } | |
316 | } | |
317 | ||
318 | static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, | |
319 | Error **errp) | |
320 | { | |
321 | CPUState *cpu; | |
322 | int ret; | |
323 | int id; | |
324 | ||
325 | CPU_FOREACH(cpu) { | |
326 | id = cpu_index(cpu); | |
327 | ret = cpu_write_elf32_note(f, cpu, id, s); | |
328 | if (ret < 0) { | |
329 | error_setg(errp, "dump: failed to write elf notes"); | |
330 | return; | |
331 | } | |
332 | } | |
333 | ||
334 | CPU_FOREACH(cpu) { | |
335 | ret = cpu_write_elf32_qemunote(f, cpu, s); | |
336 | if (ret < 0) { | |
337 | error_setg(errp, "dump: failed to write CPU status"); | |
338 | return; | |
339 | } | |
340 | } | |
341 | ||
342 | write_guest_note(f, s, errp); | |
343 | } | |
344 | ||
345 | static void write_elf_section(DumpState *s, int type, Error **errp) | |
346 | { | |
347 | Elf32_Shdr shdr32; | |
348 | Elf64_Shdr shdr64; | |
349 | int shdr_size; | |
350 | void *shdr; | |
351 | int ret; | |
352 | ||
353 | if (type == 0) { | |
354 | shdr_size = sizeof(Elf32_Shdr); | |
355 | memset(&shdr32, 0, shdr_size); | |
356 | shdr32.sh_info = cpu_to_dump32(s, s->sh_info); | |
357 | shdr = &shdr32; | |
358 | } else { | |
359 | shdr_size = sizeof(Elf64_Shdr); | |
360 | memset(&shdr64, 0, shdr_size); | |
361 | shdr64.sh_info = cpu_to_dump32(s, s->sh_info); | |
362 | shdr = &shdr64; | |
363 | } | |
364 | ||
365 | ret = fd_write_vmcore(&shdr, shdr_size, s); | |
366 | if (ret < 0) { | |
367 | error_setg_errno(errp, -ret, | |
368 | "dump: failed to write section header table"); | |
369 | } | |
370 | } | |
371 | ||
372 | static void write_data(DumpState *s, void *buf, int length, Error **errp) | |
373 | { | |
374 | int ret; | |
375 | ||
376 | ret = fd_write_vmcore(buf, length, s); | |
377 | if (ret < 0) { | |
378 | error_setg_errno(errp, -ret, "dump: failed to save memory"); | |
379 | } else { | |
380 | s->written_size += length; | |
381 | } | |
382 | } | |
383 | ||
384 | /* write the memory to vmcore. 1 page per I/O. */ | |
385 | static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, | |
386 | int64_t size, Error **errp) | |
387 | { | |
388 | int64_t i; | |
389 | Error *local_err = NULL; | |
390 | ||
391 | for (i = 0; i < size / s->dump_info.page_size; i++) { | |
392 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
393 | s->dump_info.page_size, &local_err); | |
394 | if (local_err) { | |
395 | error_propagate(errp, local_err); | |
396 | return; | |
397 | } | |
398 | } | |
399 | ||
400 | if ((size % s->dump_info.page_size) != 0) { | |
401 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
402 | size % s->dump_info.page_size, &local_err); | |
403 | if (local_err) { | |
404 | error_propagate(errp, local_err); | |
405 | return; | |
406 | } | |
407 | } | |
408 | } | |
409 | ||
410 | /* get the memory's offset and size in the vmcore */ | |
411 | static void get_offset_range(hwaddr phys_addr, | |
412 | ram_addr_t mapping_length, | |
413 | DumpState *s, | |
414 | hwaddr *p_offset, | |
415 | hwaddr *p_filesz) | |
416 | { | |
417 | GuestPhysBlock *block; | |
418 | hwaddr offset = s->memory_offset; | |
419 | int64_t size_in_block, start; | |
420 | ||
421 | /* When the memory is not stored into vmcore, offset will be -1 */ | |
422 | *p_offset = -1; | |
423 | *p_filesz = 0; | |
424 | ||
425 | if (s->has_filter) { | |
426 | if (phys_addr < s->begin || phys_addr >= s->begin + s->length) { | |
427 | return; | |
428 | } | |
429 | } | |
430 | ||
431 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
432 | if (s->has_filter) { | |
433 | if (block->target_start >= s->begin + s->length || | |
434 | block->target_end <= s->begin) { | |
435 | /* This block is out of the range */ | |
436 | continue; | |
437 | } | |
438 | ||
439 | if (s->begin <= block->target_start) { | |
440 | start = block->target_start; | |
441 | } else { | |
442 | start = s->begin; | |
443 | } | |
444 | ||
445 | size_in_block = block->target_end - start; | |
446 | if (s->begin + s->length < block->target_end) { | |
447 | size_in_block -= block->target_end - (s->begin + s->length); | |
448 | } | |
449 | } else { | |
450 | start = block->target_start; | |
451 | size_in_block = block->target_end - block->target_start; | |
452 | } | |
453 | ||
454 | if (phys_addr >= start && phys_addr < start + size_in_block) { | |
455 | *p_offset = phys_addr - start + offset; | |
456 | ||
457 | /* The offset range mapped from the vmcore file must not spill over | |
458 | * the GuestPhysBlock, clamp it. The rest of the mapping will be | |
459 | * zero-filled in memory at load time; see | |
460 | * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. | |
461 | */ | |
462 | *p_filesz = phys_addr + mapping_length <= start + size_in_block ? | |
463 | mapping_length : | |
464 | size_in_block - (phys_addr - start); | |
465 | return; | |
466 | } | |
467 | ||
468 | offset += size_in_block; | |
469 | } | |
470 | } | |
471 | ||
472 | static void write_elf_loads(DumpState *s, Error **errp) | |
473 | { | |
474 | hwaddr offset, filesz; | |
475 | MemoryMapping *memory_mapping; | |
476 | uint32_t phdr_index = 1; | |
477 | uint32_t max_index; | |
478 | Error *local_err = NULL; | |
479 | ||
480 | if (s->have_section) { | |
481 | max_index = s->sh_info; | |
482 | } else { | |
483 | max_index = s->phdr_num; | |
484 | } | |
485 | ||
486 | QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { | |
487 | get_offset_range(memory_mapping->phys_addr, | |
488 | memory_mapping->length, | |
489 | s, &offset, &filesz); | |
490 | if (s->dump_info.d_class == ELFCLASS64) { | |
491 | write_elf64_load(s, memory_mapping, phdr_index++, offset, | |
492 | filesz, &local_err); | |
493 | } else { | |
494 | write_elf32_load(s, memory_mapping, phdr_index++, offset, | |
495 | filesz, &local_err); | |
496 | } | |
497 | ||
498 | if (local_err) { | |
499 | error_propagate(errp, local_err); | |
500 | return; | |
501 | } | |
502 | ||
503 | if (phdr_index >= max_index) { | |
504 | break; | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | /* write elf header, PT_NOTE and elf note to vmcore. */ | |
510 | static void dump_begin(DumpState *s, Error **errp) | |
511 | { | |
512 | Error *local_err = NULL; | |
513 | ||
514 | /* | |
515 | * the vmcore's format is: | |
516 | * -------------- | |
517 | * | elf header | | |
518 | * -------------- | |
519 | * | PT_NOTE | | |
520 | * -------------- | |
521 | * | PT_LOAD | | |
522 | * -------------- | |
523 | * | ...... | | |
524 | * -------------- | |
525 | * | PT_LOAD | | |
526 | * -------------- | |
527 | * | sec_hdr | | |
528 | * -------------- | |
529 | * | elf note | | |
530 | * -------------- | |
531 | * | memory | | |
532 | * -------------- | |
533 | * | |
534 | * we only know where the memory is saved after we write elf note into | |
535 | * vmcore. | |
536 | */ | |
537 | ||
538 | /* write elf header to vmcore */ | |
539 | if (s->dump_info.d_class == ELFCLASS64) { | |
540 | write_elf64_header(s, &local_err); | |
541 | } else { | |
542 | write_elf32_header(s, &local_err); | |
543 | } | |
544 | if (local_err) { | |
545 | error_propagate(errp, local_err); | |
546 | return; | |
547 | } | |
548 | ||
549 | if (s->dump_info.d_class == ELFCLASS64) { | |
550 | /* write PT_NOTE to vmcore */ | |
551 | write_elf64_note(s, &local_err); | |
552 | if (local_err) { | |
553 | error_propagate(errp, local_err); | |
554 | return; | |
555 | } | |
556 | ||
557 | /* write all PT_LOAD to vmcore */ | |
558 | write_elf_loads(s, &local_err); | |
559 | if (local_err) { | |
560 | error_propagate(errp, local_err); | |
561 | return; | |
562 | } | |
563 | ||
564 | /* write section to vmcore */ | |
565 | if (s->have_section) { | |
566 | write_elf_section(s, 1, &local_err); | |
567 | if (local_err) { | |
568 | error_propagate(errp, local_err); | |
569 | return; | |
570 | } | |
571 | } | |
572 | ||
573 | /* write notes to vmcore */ | |
574 | write_elf64_notes(fd_write_vmcore, s, &local_err); | |
575 | if (local_err) { | |
576 | error_propagate(errp, local_err); | |
577 | return; | |
578 | } | |
579 | } else { | |
580 | /* write PT_NOTE to vmcore */ | |
581 | write_elf32_note(s, &local_err); | |
582 | if (local_err) { | |
583 | error_propagate(errp, local_err); | |
584 | return; | |
585 | } | |
586 | ||
587 | /* write all PT_LOAD to vmcore */ | |
588 | write_elf_loads(s, &local_err); | |
589 | if (local_err) { | |
590 | error_propagate(errp, local_err); | |
591 | return; | |
592 | } | |
593 | ||
594 | /* write section to vmcore */ | |
595 | if (s->have_section) { | |
596 | write_elf_section(s, 0, &local_err); | |
597 | if (local_err) { | |
598 | error_propagate(errp, local_err); | |
599 | return; | |
600 | } | |
601 | } | |
602 | ||
603 | /* write notes to vmcore */ | |
604 | write_elf32_notes(fd_write_vmcore, s, &local_err); | |
605 | if (local_err) { | |
606 | error_propagate(errp, local_err); | |
607 | return; | |
608 | } | |
609 | } | |
610 | } | |
611 | ||
612 | static int get_next_block(DumpState *s, GuestPhysBlock *block) | |
613 | { | |
614 | while (1) { | |
615 | block = QTAILQ_NEXT(block, next); | |
616 | if (!block) { | |
617 | /* no more block */ | |
618 | return 1; | |
619 | } | |
620 | ||
621 | s->start = 0; | |
622 | s->next_block = block; | |
623 | if (s->has_filter) { | |
624 | if (block->target_start >= s->begin + s->length || | |
625 | block->target_end <= s->begin) { | |
626 | /* This block is out of the range */ | |
627 | continue; | |
628 | } | |
629 | ||
630 | if (s->begin > block->target_start) { | |
631 | s->start = s->begin - block->target_start; | |
632 | } | |
633 | } | |
634 | ||
635 | return 0; | |
636 | } | |
637 | } | |
638 | ||
639 | /* write all memory to vmcore */ | |
640 | static void dump_iterate(DumpState *s, Error **errp) | |
641 | { | |
642 | GuestPhysBlock *block; | |
643 | int64_t size; | |
644 | Error *local_err = NULL; | |
645 | ||
646 | do { | |
647 | block = s->next_block; | |
648 | ||
649 | size = block->target_end - block->target_start; | |
650 | if (s->has_filter) { | |
651 | size -= s->start; | |
652 | if (s->begin + s->length < block->target_end) { | |
653 | size -= block->target_end - (s->begin + s->length); | |
654 | } | |
655 | } | |
656 | write_memory(s, block, s->start, size, &local_err); | |
657 | if (local_err) { | |
658 | error_propagate(errp, local_err); | |
659 | return; | |
660 | } | |
661 | ||
662 | } while (!get_next_block(s, block)); | |
663 | } | |
664 | ||
665 | static void create_vmcore(DumpState *s, Error **errp) | |
666 | { | |
667 | Error *local_err = NULL; | |
668 | ||
669 | dump_begin(s, &local_err); | |
670 | if (local_err) { | |
671 | error_propagate(errp, local_err); | |
672 | return; | |
673 | } | |
674 | ||
675 | dump_iterate(s, errp); | |
676 | } | |
677 | ||
678 | static int write_start_flat_header(int fd) | |
679 | { | |
680 | MakedumpfileHeader *mh; | |
681 | int ret = 0; | |
682 | ||
683 | QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); | |
684 | mh = g_malloc0(MAX_SIZE_MDF_HEADER); | |
685 | ||
686 | memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, | |
687 | MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); | |
688 | ||
689 | mh->type = cpu_to_be64(TYPE_FLAT_HEADER); | |
690 | mh->version = cpu_to_be64(VERSION_FLAT_HEADER); | |
691 | ||
692 | size_t written_size; | |
693 | written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); | |
694 | if (written_size != MAX_SIZE_MDF_HEADER) { | |
695 | ret = -1; | |
696 | } | |
697 | ||
698 | g_free(mh); | |
699 | return ret; | |
700 | } | |
701 | ||
702 | static int write_end_flat_header(int fd) | |
703 | { | |
704 | MakedumpfileDataHeader mdh; | |
705 | ||
706 | mdh.offset = END_FLAG_FLAT_HEADER; | |
707 | mdh.buf_size = END_FLAG_FLAT_HEADER; | |
708 | ||
709 | size_t written_size; | |
710 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
711 | if (written_size != sizeof(mdh)) { | |
712 | return -1; | |
713 | } | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | static int write_buffer(int fd, off_t offset, const void *buf, size_t size) | |
719 | { | |
720 | size_t written_size; | |
721 | MakedumpfileDataHeader mdh; | |
722 | ||
723 | mdh.offset = cpu_to_be64(offset); | |
724 | mdh.buf_size = cpu_to_be64(size); | |
725 | ||
726 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
727 | if (written_size != sizeof(mdh)) { | |
728 | return -1; | |
729 | } | |
730 | ||
731 | written_size = qemu_write_full(fd, buf, size); | |
732 | if (written_size != size) { | |
733 | return -1; | |
734 | } | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
739 | static int buf_write_note(const void *buf, size_t size, void *opaque) | |
740 | { | |
741 | DumpState *s = opaque; | |
742 | ||
743 | /* note_buf is not enough */ | |
744 | if (s->note_buf_offset + size > s->note_size) { | |
745 | return -1; | |
746 | } | |
747 | ||
748 | memcpy(s->note_buf + s->note_buf_offset, buf, size); | |
749 | ||
750 | s->note_buf_offset += size; | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
755 | /* | |
756 | * This function retrieves various sizes from an elf header. | |
757 | * | |
758 | * @note has to be a valid ELF note. The return sizes are unmodified | |
759 | * (not padded or rounded up to be multiple of 4). | |
760 | */ | |
761 | static void get_note_sizes(DumpState *s, const void *note, | |
762 | uint64_t *note_head_size, | |
763 | uint64_t *name_size, | |
764 | uint64_t *desc_size) | |
765 | { | |
766 | uint64_t note_head_sz; | |
767 | uint64_t name_sz; | |
768 | uint64_t desc_sz; | |
769 | ||
770 | if (s->dump_info.d_class == ELFCLASS64) { | |
771 | const Elf64_Nhdr *hdr = note; | |
772 | note_head_sz = sizeof(Elf64_Nhdr); | |
773 | name_sz = tswap64(hdr->n_namesz); | |
774 | desc_sz = tswap64(hdr->n_descsz); | |
775 | } else { | |
776 | const Elf32_Nhdr *hdr = note; | |
777 | note_head_sz = sizeof(Elf32_Nhdr); | |
778 | name_sz = tswap32(hdr->n_namesz); | |
779 | desc_sz = tswap32(hdr->n_descsz); | |
780 | } | |
781 | ||
782 | if (note_head_size) { | |
783 | *note_head_size = note_head_sz; | |
784 | } | |
785 | if (name_size) { | |
786 | *name_size = name_sz; | |
787 | } | |
788 | if (desc_size) { | |
789 | *desc_size = desc_sz; | |
790 | } | |
791 | } | |
792 | ||
793 | static bool note_name_equal(DumpState *s, | |
794 | const uint8_t *note, const char *name) | |
795 | { | |
796 | int len = strlen(name) + 1; | |
797 | uint64_t head_size, name_size; | |
798 | ||
799 | get_note_sizes(s, note, &head_size, &name_size, NULL); | |
800 | head_size = ROUND_UP(head_size, 4); | |
801 | ||
802 | return name_size == len && memcmp(note + head_size, name, len) == 0; | |
803 | } | |
804 | ||
805 | /* write common header, sub header and elf note to vmcore */ | |
806 | static void create_header32(DumpState *s, Error **errp) | |
807 | { | |
808 | DiskDumpHeader32 *dh = NULL; | |
809 | KdumpSubHeader32 *kh = NULL; | |
810 | size_t size; | |
811 | uint32_t block_size; | |
812 | uint32_t sub_hdr_size; | |
813 | uint32_t bitmap_blocks; | |
814 | uint32_t status = 0; | |
815 | uint64_t offset_note; | |
816 | Error *local_err = NULL; | |
817 | ||
818 | /* write common header, the version of kdump-compressed format is 6th */ | |
819 | size = sizeof(DiskDumpHeader32); | |
820 | dh = g_malloc0(size); | |
821 | ||
822 | memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); | |
823 | dh->header_version = cpu_to_dump32(s, 6); | |
824 | block_size = s->dump_info.page_size; | |
825 | dh->block_size = cpu_to_dump32(s, block_size); | |
826 | sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; | |
827 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
828 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); | |
829 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ | |
830 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); | |
831 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
832 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; | |
833 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); | |
834 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); | |
835 | ||
836 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
837 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
838 | } | |
839 | #ifdef CONFIG_LZO | |
840 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
841 | status |= DUMP_DH_COMPRESSED_LZO; | |
842 | } | |
843 | #endif | |
844 | #ifdef CONFIG_SNAPPY | |
845 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
846 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
847 | } | |
848 | #endif | |
849 | dh->status = cpu_to_dump32(s, status); | |
850 | ||
851 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
852 | error_setg(errp, "dump: failed to write disk dump header"); | |
853 | goto out; | |
854 | } | |
855 | ||
856 | /* write sub header */ | |
857 | size = sizeof(KdumpSubHeader32); | |
858 | kh = g_malloc0(size); | |
859 | ||
860 | /* 64bit max_mapnr_64 */ | |
861 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); | |
862 | kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); | |
863 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); | |
864 | ||
865 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
866 | if (s->guest_note && | |
867 | note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
868 | uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; | |
869 | ||
870 | get_note_sizes(s, s->guest_note, | |
871 | &hsize, &name_size, &size_vmcoreinfo_desc); | |
872 | offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + | |
873 | (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; | |
874 | kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); | |
875 | kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); | |
876 | } | |
877 | ||
878 | kh->offset_note = cpu_to_dump64(s, offset_note); | |
879 | kh->note_size = cpu_to_dump32(s, s->note_size); | |
880 | ||
881 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
882 | block_size, kh, size) < 0) { | |
883 | error_setg(errp, "dump: failed to write kdump sub header"); | |
884 | goto out; | |
885 | } | |
886 | ||
887 | /* write note */ | |
888 | s->note_buf = g_malloc0(s->note_size); | |
889 | s->note_buf_offset = 0; | |
890 | ||
891 | /* use s->note_buf to store notes temporarily */ | |
892 | write_elf32_notes(buf_write_note, s, &local_err); | |
893 | if (local_err) { | |
894 | error_propagate(errp, local_err); | |
895 | goto out; | |
896 | } | |
897 | if (write_buffer(s->fd, offset_note, s->note_buf, | |
898 | s->note_size) < 0) { | |
899 | error_setg(errp, "dump: failed to write notes"); | |
900 | goto out; | |
901 | } | |
902 | ||
903 | /* get offset of dump_bitmap */ | |
904 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
905 | block_size; | |
906 | ||
907 | /* get offset of page */ | |
908 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
909 | block_size; | |
910 | ||
911 | out: | |
912 | g_free(dh); | |
913 | g_free(kh); | |
914 | g_free(s->note_buf); | |
915 | } | |
916 | ||
917 | /* write common header, sub header and elf note to vmcore */ | |
918 | static void create_header64(DumpState *s, Error **errp) | |
919 | { | |
920 | DiskDumpHeader64 *dh = NULL; | |
921 | KdumpSubHeader64 *kh = NULL; | |
922 | size_t size; | |
923 | uint32_t block_size; | |
924 | uint32_t sub_hdr_size; | |
925 | uint32_t bitmap_blocks; | |
926 | uint32_t status = 0; | |
927 | uint64_t offset_note; | |
928 | Error *local_err = NULL; | |
929 | ||
930 | /* write common header, the version of kdump-compressed format is 6th */ | |
931 | size = sizeof(DiskDumpHeader64); | |
932 | dh = g_malloc0(size); | |
933 | ||
934 | memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); | |
935 | dh->header_version = cpu_to_dump32(s, 6); | |
936 | block_size = s->dump_info.page_size; | |
937 | dh->block_size = cpu_to_dump32(s, block_size); | |
938 | sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; | |
939 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
940 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); | |
941 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ | |
942 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); | |
943 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
944 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; | |
945 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); | |
946 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); | |
947 | ||
948 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
949 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
950 | } | |
951 | #ifdef CONFIG_LZO | |
952 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
953 | status |= DUMP_DH_COMPRESSED_LZO; | |
954 | } | |
955 | #endif | |
956 | #ifdef CONFIG_SNAPPY | |
957 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
958 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
959 | } | |
960 | #endif | |
961 | dh->status = cpu_to_dump32(s, status); | |
962 | ||
963 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
964 | error_setg(errp, "dump: failed to write disk dump header"); | |
965 | goto out; | |
966 | } | |
967 | ||
968 | /* write sub header */ | |
969 | size = sizeof(KdumpSubHeader64); | |
970 | kh = g_malloc0(size); | |
971 | ||
972 | /* 64bit max_mapnr_64 */ | |
973 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); | |
974 | kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); | |
975 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); | |
976 | ||
977 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
978 | if (s->guest_note && | |
979 | note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
980 | uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; | |
981 | ||
982 | get_note_sizes(s, s->guest_note, | |
983 | &hsize, &name_size, &size_vmcoreinfo_desc); | |
984 | offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + | |
985 | (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; | |
986 | kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); | |
987 | kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); | |
988 | } | |
989 | ||
990 | kh->offset_note = cpu_to_dump64(s, offset_note); | |
991 | kh->note_size = cpu_to_dump64(s, s->note_size); | |
992 | ||
993 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
994 | block_size, kh, size) < 0) { | |
995 | error_setg(errp, "dump: failed to write kdump sub header"); | |
996 | goto out; | |
997 | } | |
998 | ||
999 | /* write note */ | |
1000 | s->note_buf = g_malloc0(s->note_size); | |
1001 | s->note_buf_offset = 0; | |
1002 | ||
1003 | /* use s->note_buf to store notes temporarily */ | |
1004 | write_elf64_notes(buf_write_note, s, &local_err); | |
1005 | if (local_err) { | |
1006 | error_propagate(errp, local_err); | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | if (write_buffer(s->fd, offset_note, s->note_buf, | |
1011 | s->note_size) < 0) { | |
1012 | error_setg(errp, "dump: failed to write notes"); | |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | /* get offset of dump_bitmap */ | |
1017 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
1018 | block_size; | |
1019 | ||
1020 | /* get offset of page */ | |
1021 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
1022 | block_size; | |
1023 | ||
1024 | out: | |
1025 | g_free(dh); | |
1026 | g_free(kh); | |
1027 | g_free(s->note_buf); | |
1028 | } | |
1029 | ||
1030 | static void write_dump_header(DumpState *s, Error **errp) | |
1031 | { | |
1032 | Error *local_err = NULL; | |
1033 | ||
1034 | if (s->dump_info.d_class == ELFCLASS32) { | |
1035 | create_header32(s, &local_err); | |
1036 | } else { | |
1037 | create_header64(s, &local_err); | |
1038 | } | |
1039 | error_propagate(errp, local_err); | |
1040 | } | |
1041 | ||
1042 | static size_t dump_bitmap_get_bufsize(DumpState *s) | |
1043 | { | |
1044 | return s->dump_info.page_size; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be | |
1049 | * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. | |
1050 | * set_dump_bitmap will always leave the recently set bit un-sync. And setting | |
1051 | * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into | |
1052 | * vmcore, ie. synchronizing un-sync bit into vmcore. | |
1053 | */ | |
1054 | static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, | |
1055 | uint8_t *buf, DumpState *s) | |
1056 | { | |
1057 | off_t old_offset, new_offset; | |
1058 | off_t offset_bitmap1, offset_bitmap2; | |
1059 | uint32_t byte, bit; | |
1060 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); | |
1061 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
1062 | ||
1063 | /* should not set the previous place */ | |
1064 | assert(last_pfn <= pfn); | |
1065 | ||
1066 | /* | |
1067 | * if the bit needed to be set is not cached in buf, flush the data in buf | |
1068 | * to vmcore firstly. | |
1069 | * making new_offset be bigger than old_offset can also sync remained data | |
1070 | * into vmcore. | |
1071 | */ | |
1072 | old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); | |
1073 | new_offset = bitmap_bufsize * (pfn / bits_per_buf); | |
1074 | ||
1075 | while (old_offset < new_offset) { | |
1076 | /* calculate the offset and write dump_bitmap */ | |
1077 | offset_bitmap1 = s->offset_dump_bitmap + old_offset; | |
1078 | if (write_buffer(s->fd, offset_bitmap1, buf, | |
1079 | bitmap_bufsize) < 0) { | |
1080 | return -1; | |
1081 | } | |
1082 | ||
1083 | /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ | |
1084 | offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + | |
1085 | old_offset; | |
1086 | if (write_buffer(s->fd, offset_bitmap2, buf, | |
1087 | bitmap_bufsize) < 0) { | |
1088 | return -1; | |
1089 | } | |
1090 | ||
1091 | memset(buf, 0, bitmap_bufsize); | |
1092 | old_offset += bitmap_bufsize; | |
1093 | } | |
1094 | ||
1095 | /* get the exact place of the bit in the buf, and set it */ | |
1096 | byte = (pfn % bits_per_buf) / CHAR_BIT; | |
1097 | bit = (pfn % bits_per_buf) % CHAR_BIT; | |
1098 | if (value) { | |
1099 | buf[byte] |= 1u << bit; | |
1100 | } else { | |
1101 | buf[byte] &= ~(1u << bit); | |
1102 | } | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) | |
1108 | { | |
1109 | int target_page_shift = ctz32(s->dump_info.page_size); | |
1110 | ||
1111 | return (addr >> target_page_shift) - ARCH_PFN_OFFSET; | |
1112 | } | |
1113 | ||
1114 | static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) | |
1115 | { | |
1116 | int target_page_shift = ctz32(s->dump_info.page_size); | |
1117 | ||
1118 | return (pfn + ARCH_PFN_OFFSET) << target_page_shift; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * exam every page and return the page frame number and the address of the page. | |
1123 | * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys | |
1124 | * blocks, so block->target_start and block->target_end should be interal | |
1125 | * multiples of the target page size. | |
1126 | */ | |
1127 | static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, | |
1128 | uint8_t **bufptr, DumpState *s) | |
1129 | { | |
1130 | GuestPhysBlock *block = *blockptr; | |
1131 | hwaddr addr, target_page_mask = ~((hwaddr)s->dump_info.page_size - 1); | |
1132 | uint8_t *buf; | |
1133 | ||
1134 | /* block == NULL means the start of the iteration */ | |
1135 | if (!block) { | |
1136 | block = QTAILQ_FIRST(&s->guest_phys_blocks.head); | |
1137 | *blockptr = block; | |
1138 | assert((block->target_start & ~target_page_mask) == 0); | |
1139 | assert((block->target_end & ~target_page_mask) == 0); | |
1140 | *pfnptr = dump_paddr_to_pfn(s, block->target_start); | |
1141 | if (bufptr) { | |
1142 | *bufptr = block->host_addr; | |
1143 | } | |
1144 | return true; | |
1145 | } | |
1146 | ||
1147 | *pfnptr = *pfnptr + 1; | |
1148 | addr = dump_pfn_to_paddr(s, *pfnptr); | |
1149 | ||
1150 | if ((addr >= block->target_start) && | |
1151 | (addr + s->dump_info.page_size <= block->target_end)) { | |
1152 | buf = block->host_addr + (addr - block->target_start); | |
1153 | } else { | |
1154 | /* the next page is in the next block */ | |
1155 | block = QTAILQ_NEXT(block, next); | |
1156 | *blockptr = block; | |
1157 | if (!block) { | |
1158 | return false; | |
1159 | } | |
1160 | assert((block->target_start & ~target_page_mask) == 0); | |
1161 | assert((block->target_end & ~target_page_mask) == 0); | |
1162 | *pfnptr = dump_paddr_to_pfn(s, block->target_start); | |
1163 | buf = block->host_addr; | |
1164 | } | |
1165 | ||
1166 | if (bufptr) { | |
1167 | *bufptr = buf; | |
1168 | } | |
1169 | ||
1170 | return true; | |
1171 | } | |
1172 | ||
1173 | static void write_dump_bitmap(DumpState *s, Error **errp) | |
1174 | { | |
1175 | int ret = 0; | |
1176 | uint64_t last_pfn, pfn; | |
1177 | void *dump_bitmap_buf; | |
1178 | size_t num_dumpable; | |
1179 | GuestPhysBlock *block_iter = NULL; | |
1180 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); | |
1181 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
1182 | ||
1183 | /* dump_bitmap_buf is used to store dump_bitmap temporarily */ | |
1184 | dump_bitmap_buf = g_malloc0(bitmap_bufsize); | |
1185 | ||
1186 | num_dumpable = 0; | |
1187 | last_pfn = 0; | |
1188 | ||
1189 | /* | |
1190 | * exam memory page by page, and set the bit in dump_bitmap corresponded | |
1191 | * to the existing page. | |
1192 | */ | |
1193 | while (get_next_page(&block_iter, &pfn, NULL, s)) { | |
1194 | ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); | |
1195 | if (ret < 0) { | |
1196 | error_setg(errp, "dump: failed to set dump_bitmap"); | |
1197 | goto out; | |
1198 | } | |
1199 | ||
1200 | last_pfn = pfn; | |
1201 | num_dumpable++; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * set_dump_bitmap will always leave the recently set bit un-sync. Here we | |
1206 | * set the remaining bits from last_pfn to the end of the bitmap buffer to | |
1207 | * 0. With those set, the un-sync bit will be synchronized into the vmcore. | |
1208 | */ | |
1209 | if (num_dumpable > 0) { | |
1210 | ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, | |
1211 | dump_bitmap_buf, s); | |
1212 | if (ret < 0) { | |
1213 | error_setg(errp, "dump: failed to sync dump_bitmap"); | |
1214 | goto out; | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | /* number of dumpable pages that will be dumped later */ | |
1219 | s->num_dumpable = num_dumpable; | |
1220 | ||
1221 | out: | |
1222 | g_free(dump_bitmap_buf); | |
1223 | } | |
1224 | ||
1225 | static void prepare_data_cache(DataCache *data_cache, DumpState *s, | |
1226 | off_t offset) | |
1227 | { | |
1228 | data_cache->fd = s->fd; | |
1229 | data_cache->data_size = 0; | |
1230 | data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); | |
1231 | data_cache->buf = g_malloc0(data_cache->buf_size); | |
1232 | data_cache->offset = offset; | |
1233 | } | |
1234 | ||
1235 | static int write_cache(DataCache *dc, const void *buf, size_t size, | |
1236 | bool flag_sync) | |
1237 | { | |
1238 | /* | |
1239 | * dc->buf_size should not be less than size, otherwise dc will never be | |
1240 | * enough | |
1241 | */ | |
1242 | assert(size <= dc->buf_size); | |
1243 | ||
1244 | /* | |
1245 | * if flag_sync is set, synchronize data in dc->buf into vmcore. | |
1246 | * otherwise check if the space is enough for caching data in buf, if not, | |
1247 | * write the data in dc->buf to dc->fd and reset dc->buf | |
1248 | */ | |
1249 | if ((!flag_sync && dc->data_size + size > dc->buf_size) || | |
1250 | (flag_sync && dc->data_size > 0)) { | |
1251 | if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { | |
1252 | return -1; | |
1253 | } | |
1254 | ||
1255 | dc->offset += dc->data_size; | |
1256 | dc->data_size = 0; | |
1257 | } | |
1258 | ||
1259 | if (!flag_sync) { | |
1260 | memcpy(dc->buf + dc->data_size, buf, size); | |
1261 | dc->data_size += size; | |
1262 | } | |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | static void free_data_cache(DataCache *data_cache) | |
1268 | { | |
1269 | g_free(data_cache->buf); | |
1270 | } | |
1271 | ||
1272 | static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) | |
1273 | { | |
1274 | switch (flag_compress) { | |
1275 | case DUMP_DH_COMPRESSED_ZLIB: | |
1276 | return compressBound(page_size); | |
1277 | ||
1278 | case DUMP_DH_COMPRESSED_LZO: | |
1279 | /* | |
1280 | * LZO will expand incompressible data by a little amount. Please check | |
1281 | * the following URL to see the expansion calculation: | |
1282 | * http://www.oberhumer.com/opensource/lzo/lzofaq.php | |
1283 | */ | |
1284 | return page_size + page_size / 16 + 64 + 3; | |
1285 | ||
1286 | #ifdef CONFIG_SNAPPY | |
1287 | case DUMP_DH_COMPRESSED_SNAPPY: | |
1288 | return snappy_max_compressed_length(page_size); | |
1289 | #endif | |
1290 | } | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * check if the page is all 0 | |
1296 | */ | |
1297 | static inline bool is_zero_page(const uint8_t *buf, size_t page_size) | |
1298 | { | |
1299 | return buffer_is_zero(buf, page_size); | |
1300 | } | |
1301 | ||
1302 | static void write_dump_pages(DumpState *s, Error **errp) | |
1303 | { | |
1304 | int ret = 0; | |
1305 | DataCache page_desc, page_data; | |
1306 | size_t len_buf_out, size_out; | |
1307 | #ifdef CONFIG_LZO | |
1308 | lzo_bytep wrkmem = NULL; | |
1309 | #endif | |
1310 | uint8_t *buf_out = NULL; | |
1311 | off_t offset_desc, offset_data; | |
1312 | PageDescriptor pd, pd_zero; | |
1313 | uint8_t *buf; | |
1314 | GuestPhysBlock *block_iter = NULL; | |
1315 | uint64_t pfn_iter; | |
1316 | ||
1317 | /* get offset of page_desc and page_data in dump file */ | |
1318 | offset_desc = s->offset_page; | |
1319 | offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; | |
1320 | ||
1321 | prepare_data_cache(&page_desc, s, offset_desc); | |
1322 | prepare_data_cache(&page_data, s, offset_data); | |
1323 | ||
1324 | /* prepare buffer to store compressed data */ | |
1325 | len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); | |
1326 | assert(len_buf_out != 0); | |
1327 | ||
1328 | #ifdef CONFIG_LZO | |
1329 | wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); | |
1330 | #endif | |
1331 | ||
1332 | buf_out = g_malloc(len_buf_out); | |
1333 | ||
1334 | /* | |
1335 | * init zero page's page_desc and page_data, because every zero page | |
1336 | * uses the same page_data | |
1337 | */ | |
1338 | pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); | |
1339 | pd_zero.flags = cpu_to_dump32(s, 0); | |
1340 | pd_zero.offset = cpu_to_dump64(s, offset_data); | |
1341 | pd_zero.page_flags = cpu_to_dump64(s, 0); | |
1342 | buf = g_malloc0(s->dump_info.page_size); | |
1343 | ret = write_cache(&page_data, buf, s->dump_info.page_size, false); | |
1344 | g_free(buf); | |
1345 | if (ret < 0) { | |
1346 | error_setg(errp, "dump: failed to write page data (zero page)"); | |
1347 | goto out; | |
1348 | } | |
1349 | ||
1350 | offset_data += s->dump_info.page_size; | |
1351 | ||
1352 | /* | |
1353 | * dump memory to vmcore page by page. zero page will all be resided in the | |
1354 | * first page of page section | |
1355 | */ | |
1356 | while (get_next_page(&block_iter, &pfn_iter, &buf, s)) { | |
1357 | /* check zero page */ | |
1358 | if (is_zero_page(buf, s->dump_info.page_size)) { | |
1359 | ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), | |
1360 | false); | |
1361 | if (ret < 0) { | |
1362 | error_setg(errp, "dump: failed to write page desc"); | |
1363 | goto out; | |
1364 | } | |
1365 | } else { | |
1366 | /* | |
1367 | * not zero page, then: | |
1368 | * 1. compress the page | |
1369 | * 2. write the compressed page into the cache of page_data | |
1370 | * 3. get page desc of the compressed page and write it into the | |
1371 | * cache of page_desc | |
1372 | * | |
1373 | * only one compression format will be used here, for | |
1374 | * s->flag_compress is set. But when compression fails to work, | |
1375 | * we fall back to save in plaintext. | |
1376 | */ | |
1377 | size_out = len_buf_out; | |
1378 | if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && | |
1379 | (compress2(buf_out, (uLongf *)&size_out, buf, | |
1380 | s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && | |
1381 | (size_out < s->dump_info.page_size)) { | |
1382 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); | |
1383 | pd.size = cpu_to_dump32(s, size_out); | |
1384 | ||
1385 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1386 | if (ret < 0) { | |
1387 | error_setg(errp, "dump: failed to write page data"); | |
1388 | goto out; | |
1389 | } | |
1390 | #ifdef CONFIG_LZO | |
1391 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && | |
1392 | (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, | |
1393 | (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && | |
1394 | (size_out < s->dump_info.page_size)) { | |
1395 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); | |
1396 | pd.size = cpu_to_dump32(s, size_out); | |
1397 | ||
1398 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1399 | if (ret < 0) { | |
1400 | error_setg(errp, "dump: failed to write page data"); | |
1401 | goto out; | |
1402 | } | |
1403 | #endif | |
1404 | #ifdef CONFIG_SNAPPY | |
1405 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && | |
1406 | (snappy_compress((char *)buf, s->dump_info.page_size, | |
1407 | (char *)buf_out, &size_out) == SNAPPY_OK) && | |
1408 | (size_out < s->dump_info.page_size)) { | |
1409 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); | |
1410 | pd.size = cpu_to_dump32(s, size_out); | |
1411 | ||
1412 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1413 | if (ret < 0) { | |
1414 | error_setg(errp, "dump: failed to write page data"); | |
1415 | goto out; | |
1416 | } | |
1417 | #endif | |
1418 | } else { | |
1419 | /* | |
1420 | * fall back to save in plaintext, size_out should be | |
1421 | * assigned the target's page size | |
1422 | */ | |
1423 | pd.flags = cpu_to_dump32(s, 0); | |
1424 | size_out = s->dump_info.page_size; | |
1425 | pd.size = cpu_to_dump32(s, size_out); | |
1426 | ||
1427 | ret = write_cache(&page_data, buf, | |
1428 | s->dump_info.page_size, false); | |
1429 | if (ret < 0) { | |
1430 | error_setg(errp, "dump: failed to write page data"); | |
1431 | goto out; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | /* get and write page desc here */ | |
1436 | pd.page_flags = cpu_to_dump64(s, 0); | |
1437 | pd.offset = cpu_to_dump64(s, offset_data); | |
1438 | offset_data += size_out; | |
1439 | ||
1440 | ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); | |
1441 | if (ret < 0) { | |
1442 | error_setg(errp, "dump: failed to write page desc"); | |
1443 | goto out; | |
1444 | } | |
1445 | } | |
1446 | s->written_size += s->dump_info.page_size; | |
1447 | } | |
1448 | ||
1449 | ret = write_cache(&page_desc, NULL, 0, true); | |
1450 | if (ret < 0) { | |
1451 | error_setg(errp, "dump: failed to sync cache for page_desc"); | |
1452 | goto out; | |
1453 | } | |
1454 | ret = write_cache(&page_data, NULL, 0, true); | |
1455 | if (ret < 0) { | |
1456 | error_setg(errp, "dump: failed to sync cache for page_data"); | |
1457 | goto out; | |
1458 | } | |
1459 | ||
1460 | out: | |
1461 | free_data_cache(&page_desc); | |
1462 | free_data_cache(&page_data); | |
1463 | ||
1464 | #ifdef CONFIG_LZO | |
1465 | g_free(wrkmem); | |
1466 | #endif | |
1467 | ||
1468 | g_free(buf_out); | |
1469 | } | |
1470 | ||
1471 | static void create_kdump_vmcore(DumpState *s, Error **errp) | |
1472 | { | |
1473 | int ret; | |
1474 | Error *local_err = NULL; | |
1475 | ||
1476 | /* | |
1477 | * the kdump-compressed format is: | |
1478 | * File offset | |
1479 | * +------------------------------------------+ 0x0 | |
1480 | * | main header (struct disk_dump_header) | | |
1481 | * |------------------------------------------+ block 1 | |
1482 | * | sub header (struct kdump_sub_header) | | |
1483 | * |------------------------------------------+ block 2 | |
1484 | * | 1st-dump_bitmap | | |
1485 | * |------------------------------------------+ block 2 + X blocks | |
1486 | * | 2nd-dump_bitmap | (aligned by block) | |
1487 | * |------------------------------------------+ block 2 + 2 * X blocks | |
1488 | * | page desc for pfn 0 (struct page_desc) | (aligned by block) | |
1489 | * | page desc for pfn 1 (struct page_desc) | | |
1490 | * | : | | |
1491 | * |------------------------------------------| (not aligned by block) | |
1492 | * | page data (pfn 0) | | |
1493 | * | page data (pfn 1) | | |
1494 | * | : | | |
1495 | * +------------------------------------------+ | |
1496 | */ | |
1497 | ||
1498 | ret = write_start_flat_header(s->fd); | |
1499 | if (ret < 0) { | |
1500 | error_setg(errp, "dump: failed to write start flat header"); | |
1501 | return; | |
1502 | } | |
1503 | ||
1504 | write_dump_header(s, &local_err); | |
1505 | if (local_err) { | |
1506 | error_propagate(errp, local_err); | |
1507 | return; | |
1508 | } | |
1509 | ||
1510 | write_dump_bitmap(s, &local_err); | |
1511 | if (local_err) { | |
1512 | error_propagate(errp, local_err); | |
1513 | return; | |
1514 | } | |
1515 | ||
1516 | write_dump_pages(s, &local_err); | |
1517 | if (local_err) { | |
1518 | error_propagate(errp, local_err); | |
1519 | return; | |
1520 | } | |
1521 | ||
1522 | ret = write_end_flat_header(s->fd); | |
1523 | if (ret < 0) { | |
1524 | error_setg(errp, "dump: failed to write end flat header"); | |
1525 | return; | |
1526 | } | |
1527 | } | |
1528 | ||
1529 | static ram_addr_t get_start_block(DumpState *s) | |
1530 | { | |
1531 | GuestPhysBlock *block; | |
1532 | ||
1533 | if (!s->has_filter) { | |
1534 | s->next_block = QTAILQ_FIRST(&s->guest_phys_blocks.head); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
1539 | if (block->target_start >= s->begin + s->length || | |
1540 | block->target_end <= s->begin) { | |
1541 | /* This block is out of the range */ | |
1542 | continue; | |
1543 | } | |
1544 | ||
1545 | s->next_block = block; | |
1546 | if (s->begin > block->target_start) { | |
1547 | s->start = s->begin - block->target_start; | |
1548 | } else { | |
1549 | s->start = 0; | |
1550 | } | |
1551 | return s->start; | |
1552 | } | |
1553 | ||
1554 | return -1; | |
1555 | } | |
1556 | ||
1557 | static void get_max_mapnr(DumpState *s) | |
1558 | { | |
1559 | GuestPhysBlock *last_block; | |
1560 | ||
1561 | last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); | |
1562 | s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); | |
1563 | } | |
1564 | ||
1565 | static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; | |
1566 | ||
1567 | static void dump_state_prepare(DumpState *s) | |
1568 | { | |
1569 | /* zero the struct, setting status to active */ | |
1570 | *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; | |
1571 | } | |
1572 | ||
1573 | bool dump_in_progress(void) | |
1574 | { | |
1575 | DumpState *state = &dump_state_global; | |
1576 | return (atomic_read(&state->status) == DUMP_STATUS_ACTIVE); | |
1577 | } | |
1578 | ||
1579 | /* calculate total size of memory to be dumped (taking filter into | |
1580 | * acoount.) */ | |
1581 | static int64_t dump_calculate_size(DumpState *s) | |
1582 | { | |
1583 | GuestPhysBlock *block; | |
1584 | int64_t size = 0, total = 0, left = 0, right = 0; | |
1585 | ||
1586 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
1587 | if (s->has_filter) { | |
1588 | /* calculate the overlapped region. */ | |
1589 | left = MAX(s->begin, block->target_start); | |
1590 | right = MIN(s->begin + s->length, block->target_end); | |
1591 | size = right - left; | |
1592 | size = size > 0 ? size : 0; | |
1593 | } else { | |
1594 | /* count the whole region in */ | |
1595 | size = (block->target_end - block->target_start); | |
1596 | } | |
1597 | total += size; | |
1598 | } | |
1599 | ||
1600 | return total; | |
1601 | } | |
1602 | ||
1603 | static void vmcoreinfo_update_phys_base(DumpState *s) | |
1604 | { | |
1605 | uint64_t size, note_head_size, name_size, phys_base; | |
1606 | char **lines; | |
1607 | uint8_t *vmci; | |
1608 | size_t i; | |
1609 | ||
1610 | if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
1611 | return; | |
1612 | } | |
1613 | ||
1614 | get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); | |
1615 | note_head_size = ROUND_UP(note_head_size, 4); | |
1616 | ||
1617 | vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); | |
1618 | *(vmci + size) = '\0'; | |
1619 | ||
1620 | lines = g_strsplit((char *)vmci, "\n", -1); | |
1621 | for (i = 0; lines[i]; i++) { | |
1622 | const char *prefix = NULL; | |
1623 | ||
1624 | if (s->dump_info.d_machine == EM_X86_64) { | |
1625 | prefix = "NUMBER(phys_base)="; | |
1626 | } else if (s->dump_info.d_machine == EM_AARCH64) { | |
1627 | prefix = "NUMBER(PHYS_OFFSET)="; | |
1628 | } | |
1629 | ||
1630 | if (prefix && g_str_has_prefix(lines[i], prefix)) { | |
1631 | if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, | |
1632 | &phys_base) < 0) { | |
1633 | warn_report("Failed to read %s", prefix); | |
1634 | } else { | |
1635 | s->dump_info.phys_base = phys_base; | |
1636 | } | |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | ||
1641 | g_strfreev(lines); | |
1642 | } | |
1643 | ||
1644 | static void dump_init(DumpState *s, int fd, bool has_format, | |
1645 | DumpGuestMemoryFormat format, bool paging, bool has_filter, | |
1646 | int64_t begin, int64_t length, Error **errp) | |
1647 | { | |
1648 | VMCoreInfoState *vmci = vmcoreinfo_find(); | |
1649 | CPUState *cpu; | |
1650 | int nr_cpus; | |
1651 | Error *err = NULL; | |
1652 | int ret; | |
1653 | ||
1654 | s->has_format = has_format; | |
1655 | s->format = format; | |
1656 | s->written_size = 0; | |
1657 | ||
1658 | /* kdump-compressed is conflict with paging and filter */ | |
1659 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1660 | assert(!paging && !has_filter); | |
1661 | } | |
1662 | ||
1663 | if (runstate_is_running()) { | |
1664 | vm_stop(RUN_STATE_SAVE_VM); | |
1665 | s->resume = true; | |
1666 | } else { | |
1667 | s->resume = false; | |
1668 | } | |
1669 | ||
1670 | /* If we use KVM, we should synchronize the registers before we get dump | |
1671 | * info or physmap info. | |
1672 | */ | |
1673 | cpu_synchronize_all_states(); | |
1674 | nr_cpus = 0; | |
1675 | CPU_FOREACH(cpu) { | |
1676 | nr_cpus++; | |
1677 | } | |
1678 | ||
1679 | s->fd = fd; | |
1680 | s->has_filter = has_filter; | |
1681 | s->begin = begin; | |
1682 | s->length = length; | |
1683 | ||
1684 | memory_mapping_list_init(&s->list); | |
1685 | ||
1686 | guest_phys_blocks_init(&s->guest_phys_blocks); | |
1687 | guest_phys_blocks_append(&s->guest_phys_blocks); | |
1688 | s->total_size = dump_calculate_size(s); | |
1689 | #ifdef DEBUG_DUMP_GUEST_MEMORY | |
1690 | fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); | |
1691 | #endif | |
1692 | ||
1693 | /* it does not make sense to dump non-existent memory */ | |
1694 | if (!s->total_size) { | |
1695 | error_setg(errp, "dump: no guest memory to dump"); | |
1696 | goto cleanup; | |
1697 | } | |
1698 | ||
1699 | s->start = get_start_block(s); | |
1700 | if (s->start == -1) { | |
1701 | error_setg(errp, QERR_INVALID_PARAMETER, "begin"); | |
1702 | goto cleanup; | |
1703 | } | |
1704 | ||
1705 | /* get dump info: endian, class and architecture. | |
1706 | * If the target architecture is not supported, cpu_get_dump_info() will | |
1707 | * return -1. | |
1708 | */ | |
1709 | ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); | |
1710 | if (ret < 0) { | |
1711 | error_setg(errp, QERR_UNSUPPORTED); | |
1712 | goto cleanup; | |
1713 | } | |
1714 | ||
1715 | if (!s->dump_info.page_size) { | |
1716 | s->dump_info.page_size = TARGET_PAGE_SIZE; | |
1717 | } | |
1718 | ||
1719 | s->note_size = cpu_get_note_size(s->dump_info.d_class, | |
1720 | s->dump_info.d_machine, nr_cpus); | |
1721 | if (s->note_size < 0) { | |
1722 | error_setg(errp, QERR_UNSUPPORTED); | |
1723 | goto cleanup; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * The goal of this block is to (a) update the previously guessed | |
1728 | * phys_base, (b) copy the guest note out of the guest. | |
1729 | * Failure to do so is not fatal for dumping. | |
1730 | */ | |
1731 | if (vmci) { | |
1732 | uint64_t addr, note_head_size, name_size, desc_size; | |
1733 | uint32_t size; | |
1734 | uint16_t format; | |
1735 | ||
1736 | note_head_size = s->dump_info.d_class == ELFCLASS32 ? | |
1737 | sizeof(Elf32_Nhdr) : sizeof(Elf64_Nhdr); | |
1738 | ||
1739 | format = le16_to_cpu(vmci->vmcoreinfo.guest_format); | |
1740 | size = le32_to_cpu(vmci->vmcoreinfo.size); | |
1741 | addr = le64_to_cpu(vmci->vmcoreinfo.paddr); | |
1742 | if (!vmci->has_vmcoreinfo) { | |
1743 | warn_report("guest note is not present"); | |
1744 | } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { | |
1745 | warn_report("guest note size is invalid: %" PRIu32, size); | |
1746 | } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { | |
1747 | warn_report("guest note format is unsupported: %" PRIu16, format); | |
1748 | } else { | |
1749 | s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ | |
1750 | cpu_physical_memory_read(addr, s->guest_note, size); | |
1751 | ||
1752 | get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); | |
1753 | s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, | |
1754 | desc_size); | |
1755 | if (name_size > MAX_GUEST_NOTE_SIZE || | |
1756 | desc_size > MAX_GUEST_NOTE_SIZE || | |
1757 | s->guest_note_size > size) { | |
1758 | warn_report("Invalid guest note header"); | |
1759 | g_free(s->guest_note); | |
1760 | s->guest_note = NULL; | |
1761 | } else { | |
1762 | vmcoreinfo_update_phys_base(s); | |
1763 | s->note_size += s->guest_note_size; | |
1764 | } | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | /* get memory mapping */ | |
1769 | if (paging) { | |
1770 | qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, &err); | |
1771 | if (err != NULL) { | |
1772 | error_propagate(errp, err); | |
1773 | goto cleanup; | |
1774 | } | |
1775 | } else { | |
1776 | qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); | |
1777 | } | |
1778 | ||
1779 | s->nr_cpus = nr_cpus; | |
1780 | ||
1781 | get_max_mapnr(s); | |
1782 | ||
1783 | uint64_t tmp; | |
1784 | tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), | |
1785 | s->dump_info.page_size); | |
1786 | s->len_dump_bitmap = tmp * s->dump_info.page_size; | |
1787 | ||
1788 | /* init for kdump-compressed format */ | |
1789 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1790 | switch (format) { | |
1791 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: | |
1792 | s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; | |
1793 | break; | |
1794 | ||
1795 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: | |
1796 | #ifdef CONFIG_LZO | |
1797 | if (lzo_init() != LZO_E_OK) { | |
1798 | error_setg(errp, "failed to initialize the LZO library"); | |
1799 | goto cleanup; | |
1800 | } | |
1801 | #endif | |
1802 | s->flag_compress = DUMP_DH_COMPRESSED_LZO; | |
1803 | break; | |
1804 | ||
1805 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: | |
1806 | s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; | |
1807 | break; | |
1808 | ||
1809 | default: | |
1810 | s->flag_compress = 0; | |
1811 | } | |
1812 | ||
1813 | return; | |
1814 | } | |
1815 | ||
1816 | if (s->has_filter) { | |
1817 | memory_mapping_filter(&s->list, s->begin, s->length); | |
1818 | } | |
1819 | ||
1820 | /* | |
1821 | * calculate phdr_num | |
1822 | * | |
1823 | * the type of ehdr->e_phnum is uint16_t, so we should avoid overflow | |
1824 | */ | |
1825 | s->phdr_num = 1; /* PT_NOTE */ | |
1826 | if (s->list.num < UINT16_MAX - 2) { | |
1827 | s->phdr_num += s->list.num; | |
1828 | s->have_section = false; | |
1829 | } else { | |
1830 | s->have_section = true; | |
1831 | s->phdr_num = PN_XNUM; | |
1832 | s->sh_info = 1; /* PT_NOTE */ | |
1833 | ||
1834 | /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */ | |
1835 | if (s->list.num <= UINT32_MAX - 1) { | |
1836 | s->sh_info += s->list.num; | |
1837 | } else { | |
1838 | s->sh_info = UINT32_MAX; | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | if (s->dump_info.d_class == ELFCLASS64) { | |
1843 | if (s->have_section) { | |
1844 | s->memory_offset = sizeof(Elf64_Ehdr) + | |
1845 | sizeof(Elf64_Phdr) * s->sh_info + | |
1846 | sizeof(Elf64_Shdr) + s->note_size; | |
1847 | } else { | |
1848 | s->memory_offset = sizeof(Elf64_Ehdr) + | |
1849 | sizeof(Elf64_Phdr) * s->phdr_num + s->note_size; | |
1850 | } | |
1851 | } else { | |
1852 | if (s->have_section) { | |
1853 | s->memory_offset = sizeof(Elf32_Ehdr) + | |
1854 | sizeof(Elf32_Phdr) * s->sh_info + | |
1855 | sizeof(Elf32_Shdr) + s->note_size; | |
1856 | } else { | |
1857 | s->memory_offset = sizeof(Elf32_Ehdr) + | |
1858 | sizeof(Elf32_Phdr) * s->phdr_num + s->note_size; | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | return; | |
1863 | ||
1864 | cleanup: | |
1865 | dump_cleanup(s); | |
1866 | } | |
1867 | ||
1868 | /* this operation might be time consuming. */ | |
1869 | static void dump_process(DumpState *s, Error **errp) | |
1870 | { | |
1871 | Error *local_err = NULL; | |
1872 | DumpQueryResult *result = NULL; | |
1873 | ||
1874 | if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { | |
1875 | #ifdef TARGET_X86_64 | |
1876 | create_win_dump(s, &local_err); | |
1877 | #endif | |
1878 | } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1879 | create_kdump_vmcore(s, &local_err); | |
1880 | } else { | |
1881 | create_vmcore(s, &local_err); | |
1882 | } | |
1883 | ||
1884 | /* make sure status is written after written_size updates */ | |
1885 | smp_wmb(); | |
1886 | atomic_set(&s->status, | |
1887 | (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); | |
1888 | ||
1889 | /* send DUMP_COMPLETED message (unconditionally) */ | |
1890 | result = qmp_query_dump(NULL); | |
1891 | /* should never fail */ | |
1892 | assert(result); | |
1893 | qapi_event_send_dump_completed(result, !!local_err, (local_err ? \ | |
1894 | error_get_pretty(local_err) : NULL)); | |
1895 | qapi_free_DumpQueryResult(result); | |
1896 | ||
1897 | error_propagate(errp, local_err); | |
1898 | dump_cleanup(s); | |
1899 | } | |
1900 | ||
1901 | static void *dump_thread(void *data) | |
1902 | { | |
1903 | DumpState *s = (DumpState *)data; | |
1904 | dump_process(s, NULL); | |
1905 | return NULL; | |
1906 | } | |
1907 | ||
1908 | DumpQueryResult *qmp_query_dump(Error **errp) | |
1909 | { | |
1910 | DumpQueryResult *result = g_new(DumpQueryResult, 1); | |
1911 | DumpState *state = &dump_state_global; | |
1912 | result->status = atomic_read(&state->status); | |
1913 | /* make sure we are reading status and written_size in order */ | |
1914 | smp_rmb(); | |
1915 | result->completed = state->written_size; | |
1916 | result->total = state->total_size; | |
1917 | return result; | |
1918 | } | |
1919 | ||
1920 | void qmp_dump_guest_memory(bool paging, const char *file, | |
1921 | bool has_detach, bool detach, | |
1922 | bool has_begin, int64_t begin, bool has_length, | |
1923 | int64_t length, bool has_format, | |
1924 | DumpGuestMemoryFormat format, Error **errp) | |
1925 | { | |
1926 | const char *p; | |
1927 | int fd = -1; | |
1928 | DumpState *s; | |
1929 | Error *local_err = NULL; | |
1930 | bool detach_p = false; | |
1931 | ||
1932 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1933 | error_setg(errp, "Dump not allowed during incoming migration."); | |
1934 | return; | |
1935 | } | |
1936 | ||
1937 | /* if there is a dump in background, we should wait until the dump | |
1938 | * finished */ | |
1939 | if (dump_in_progress()) { | |
1940 | error_setg(errp, "There is a dump in process, please wait."); | |
1941 | return; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * kdump-compressed format need the whole memory dumped, so paging or | |
1946 | * filter is not supported here. | |
1947 | */ | |
1948 | if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && | |
1949 | (paging || has_begin || has_length)) { | |
1950 | error_setg(errp, "kdump-compressed format doesn't support paging or " | |
1951 | "filter"); | |
1952 | return; | |
1953 | } | |
1954 | if (has_begin && !has_length) { | |
1955 | error_setg(errp, QERR_MISSING_PARAMETER, "length"); | |
1956 | return; | |
1957 | } | |
1958 | if (!has_begin && has_length) { | |
1959 | error_setg(errp, QERR_MISSING_PARAMETER, "begin"); | |
1960 | return; | |
1961 | } | |
1962 | if (has_detach) { | |
1963 | detach_p = detach; | |
1964 | } | |
1965 | ||
1966 | /* check whether lzo/snappy is supported */ | |
1967 | #ifndef CONFIG_LZO | |
1968 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { | |
1969 | error_setg(errp, "kdump-lzo is not available now"); | |
1970 | return; | |
1971 | } | |
1972 | #endif | |
1973 | ||
1974 | #ifndef CONFIG_SNAPPY | |
1975 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { | |
1976 | error_setg(errp, "kdump-snappy is not available now"); | |
1977 | return; | |
1978 | } | |
1979 | #endif | |
1980 | ||
1981 | #ifndef TARGET_X86_64 | |
1982 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { | |
1983 | error_setg(errp, "Windows dump is only available for x86-64"); | |
1984 | return; | |
1985 | } | |
1986 | #endif | |
1987 | ||
1988 | #if !defined(WIN32) | |
1989 | if (strstart(file, "fd:", &p)) { | |
1990 | fd = monitor_get_fd(cur_mon, p, errp); | |
1991 | if (fd == -1) { | |
1992 | return; | |
1993 | } | |
1994 | } | |
1995 | #endif | |
1996 | ||
1997 | if (strstart(file, "file:", &p)) { | |
1998 | fd = qemu_open(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); | |
1999 | if (fd < 0) { | |
2000 | error_setg_file_open(errp, errno, p); | |
2001 | return; | |
2002 | } | |
2003 | } | |
2004 | ||
2005 | if (fd == -1) { | |
2006 | error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); | |
2007 | return; | |
2008 | } | |
2009 | ||
2010 | s = &dump_state_global; | |
2011 | dump_state_prepare(s); | |
2012 | ||
2013 | dump_init(s, fd, has_format, format, paging, has_begin, | |
2014 | begin, length, &local_err); | |
2015 | if (local_err) { | |
2016 | error_propagate(errp, local_err); | |
2017 | atomic_set(&s->status, DUMP_STATUS_FAILED); | |
2018 | return; | |
2019 | } | |
2020 | ||
2021 | if (detach_p) { | |
2022 | /* detached dump */ | |
2023 | s->detached = true; | |
2024 | qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, | |
2025 | s, QEMU_THREAD_DETACHED); | |
2026 | } else { | |
2027 | /* sync dump */ | |
2028 | dump_process(s, errp); | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) | |
2033 | { | |
2034 | DumpGuestMemoryFormatList *item; | |
2035 | DumpGuestMemoryCapability *cap = | |
2036 | g_malloc0(sizeof(DumpGuestMemoryCapability)); | |
2037 | ||
2038 | /* elf is always available */ | |
2039 | item = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
2040 | cap->formats = item; | |
2041 | item->value = DUMP_GUEST_MEMORY_FORMAT_ELF; | |
2042 | ||
2043 | /* kdump-zlib is always available */ | |
2044 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
2045 | item = item->next; | |
2046 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB; | |
2047 | ||
2048 | /* add new item if kdump-lzo is available */ | |
2049 | #ifdef CONFIG_LZO | |
2050 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
2051 | item = item->next; | |
2052 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO; | |
2053 | #endif | |
2054 | ||
2055 | /* add new item if kdump-snappy is available */ | |
2056 | #ifdef CONFIG_SNAPPY | |
2057 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
2058 | item = item->next; | |
2059 | item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY; | |
2060 | #endif | |
2061 | ||
2062 | /* Windows dump is available only if target is x86_64 */ | |
2063 | #ifdef TARGET_X86_64 | |
2064 | item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList)); | |
2065 | item = item->next; | |
2066 | item->value = DUMP_GUEST_MEMORY_FORMAT_WIN_DMP; | |
2067 | #endif | |
2068 | ||
2069 | return cap; | |
2070 | } |