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Commit | Line | Data |
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783e9b48 WC |
1 | /* |
2 | * QEMU dump | |
3 | * | |
4 | * Copyright Fujitsu, Corp. 2011, 2012 | |
5 | * | |
6 | * Authors: | |
7 | * Wen Congyang <wency@cn.fujitsu.com> | |
8 | * | |
352666e2 SW |
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. | |
783e9b48 WC |
11 | * |
12 | */ | |
13 | ||
d38ea87a | 14 | #include "qemu/osdep.h" |
f348b6d1 | 15 | #include "qemu/cutils.h" |
783e9b48 | 16 | #include "elf.h" |
ac978771 | 17 | #include "qemu/bswap.h" |
c5d40b22 | 18 | #include "exec/target_page.h" |
83c9089e | 19 | #include "monitor/monitor.h" |
9c17d615 | 20 | #include "sysemu/dump.h" |
54d31236 | 21 | #include "sysemu/runstate.h" |
1b3509ca | 22 | #include "sysemu/cpus.h" |
e688df6b | 23 | #include "qapi/error.h" |
d06b747b MA |
24 | #include "qapi/qapi-commands-dump.h" |
25 | #include "qapi/qapi-events-dump.h" | |
cc7a8ea7 | 26 | #include "qapi/qmp/qerror.h" |
db725815 | 27 | #include "qemu/main-loop.h" |
903ef734 | 28 | #include "hw/misc/vmcoreinfo.h" |
b7bc6b18 | 29 | #include "migration/blocker.h" |
ac978771 | 30 | #include "hw/core/cpu.h" |
2da91b54 | 31 | #include "win_dump.h" |
2da91b54 | 32 | |
d12f57ec QN |
33 | #include <zlib.h> |
34 | #ifdef CONFIG_LZO | |
35 | #include <lzo/lzo1x.h> | |
36 | #endif | |
37 | #ifdef CONFIG_SNAPPY | |
38 | #include <snappy-c.h> | |
39 | #endif | |
4ab23a91 QN |
40 | #ifndef ELF_MACHINE_UNAME |
41 | #define ELF_MACHINE_UNAME "Unknown" | |
42 | #endif | |
d12f57ec | 43 | |
903ef734 MAL |
44 | #define MAX_GUEST_NOTE_SIZE (1 << 20) /* 1MB should be enough */ |
45 | ||
b7bc6b18 PX |
46 | static Error *dump_migration_blocker; |
47 | ||
903ef734 MAL |
48 | #define ELF_NOTE_SIZE(hdr_size, name_size, desc_size) \ |
49 | ((DIV_ROUND_UP((hdr_size), 4) + \ | |
50 | DIV_ROUND_UP((name_size), 4) + \ | |
51 | DIV_ROUND_UP((desc_size), 4)) * 4) | |
52 | ||
05bbaa50 JF |
53 | static inline bool dump_is_64bit(DumpState *s) |
54 | { | |
55 | return s->dump_info.d_class == ELFCLASS64; | |
56 | } | |
57 | ||
dddf725f JF |
58 | static inline bool dump_has_filter(DumpState *s) |
59 | { | |
60 | return s->filter_area_length > 0; | |
61 | } | |
62 | ||
acb0ef58 | 63 | uint16_t cpu_to_dump16(DumpState *s, uint16_t val) |
783e9b48 | 64 | { |
acb0ef58 | 65 | if (s->dump_info.d_endian == ELFDATA2LSB) { |
783e9b48 WC |
66 | val = cpu_to_le16(val); |
67 | } else { | |
68 | val = cpu_to_be16(val); | |
69 | } | |
70 | ||
71 | return val; | |
72 | } | |
73 | ||
acb0ef58 | 74 | uint32_t cpu_to_dump32(DumpState *s, uint32_t val) |
783e9b48 | 75 | { |
acb0ef58 | 76 | if (s->dump_info.d_endian == ELFDATA2LSB) { |
783e9b48 WC |
77 | val = cpu_to_le32(val); |
78 | } else { | |
79 | val = cpu_to_be32(val); | |
80 | } | |
81 | ||
82 | return val; | |
83 | } | |
84 | ||
acb0ef58 | 85 | uint64_t cpu_to_dump64(DumpState *s, uint64_t val) |
783e9b48 | 86 | { |
acb0ef58 | 87 | if (s->dump_info.d_endian == ELFDATA2LSB) { |
783e9b48 WC |
88 | val = cpu_to_le64(val); |
89 | } else { | |
90 | val = cpu_to_be64(val); | |
91 | } | |
92 | ||
93 | return val; | |
94 | } | |
95 | ||
783e9b48 WC |
96 | static int dump_cleanup(DumpState *s) |
97 | { | |
5ee163e8 | 98 | guest_phys_blocks_free(&s->guest_phys_blocks); |
783e9b48 | 99 | memory_mapping_list_free(&s->list); |
2928207a | 100 | close(s->fd); |
903ef734 | 101 | g_free(s->guest_note); |
9b72224f | 102 | g_array_unref(s->string_table_buf); |
903ef734 | 103 | s->guest_note = NULL; |
783e9b48 | 104 | if (s->resume) { |
6796b400 FZ |
105 | if (s->detached) { |
106 | qemu_mutex_lock_iothread(); | |
107 | } | |
783e9b48 | 108 | vm_start(); |
6796b400 FZ |
109 | if (s->detached) { |
110 | qemu_mutex_unlock_iothread(); | |
111 | } | |
783e9b48 | 112 | } |
b7bc6b18 | 113 | migrate_del_blocker(dump_migration_blocker); |
783e9b48 | 114 | |
2928207a | 115 | return 0; |
783e9b48 WC |
116 | } |
117 | ||
b5ba1cc6 | 118 | static int fd_write_vmcore(const void *buf, size_t size, void *opaque) |
783e9b48 WC |
119 | { |
120 | DumpState *s = opaque; | |
2f61652d LC |
121 | size_t written_size; |
122 | ||
123 | written_size = qemu_write_full(s->fd, buf, size); | |
124 | if (written_size != size) { | |
0c33659d | 125 | return -errno; |
783e9b48 WC |
126 | } |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
670e7699 | 131 | static void prepare_elf64_header(DumpState *s, Elf64_Ehdr *elf_header) |
783e9b48 | 132 | { |
046bc416 JF |
133 | /* |
134 | * phnum in the elf header is 16 bit, if we have more segments we | |
135 | * set phnum to PN_XNUM and write the real number of segments to a | |
136 | * special section. | |
137 | */ | |
138 | uint16_t phnum = MIN(s->phdr_num, PN_XNUM); | |
783e9b48 | 139 | |
670e7699 JF |
140 | memset(elf_header, 0, sizeof(Elf64_Ehdr)); |
141 | memcpy(elf_header, ELFMAG, SELFMAG); | |
142 | elf_header->e_ident[EI_CLASS] = ELFCLASS64; | |
143 | elf_header->e_ident[EI_DATA] = s->dump_info.d_endian; | |
144 | elf_header->e_ident[EI_VERSION] = EV_CURRENT; | |
145 | elf_header->e_type = cpu_to_dump16(s, ET_CORE); | |
146 | elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
147 | elf_header->e_version = cpu_to_dump32(s, EV_CURRENT); | |
148 | elf_header->e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
149 | elf_header->e_phoff = cpu_to_dump64(s, s->phdr_offset); | |
150 | elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); | |
151 | elf_header->e_phnum = cpu_to_dump16(s, phnum); | |
9b72224f JF |
152 | elf_header->e_shoff = cpu_to_dump64(s, s->shdr_offset); |
153 | elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); | |
154 | elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num); | |
155 | elf_header->e_shstrndx = cpu_to_dump16(s, s->shdr_num - 1); | |
783e9b48 WC |
156 | } |
157 | ||
670e7699 | 158 | static void prepare_elf32_header(DumpState *s, Elf32_Ehdr *elf_header) |
783e9b48 | 159 | { |
046bc416 JF |
160 | /* |
161 | * phnum in the elf header is 16 bit, if we have more segments we | |
162 | * set phnum to PN_XNUM and write the real number of segments to a | |
163 | * special section. | |
164 | */ | |
165 | uint16_t phnum = MIN(s->phdr_num, PN_XNUM); | |
783e9b48 | 166 | |
670e7699 JF |
167 | memset(elf_header, 0, sizeof(Elf32_Ehdr)); |
168 | memcpy(elf_header, ELFMAG, SELFMAG); | |
169 | elf_header->e_ident[EI_CLASS] = ELFCLASS32; | |
170 | elf_header->e_ident[EI_DATA] = s->dump_info.d_endian; | |
171 | elf_header->e_ident[EI_VERSION] = EV_CURRENT; | |
172 | elf_header->e_type = cpu_to_dump16(s, ET_CORE); | |
173 | elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine); | |
174 | elf_header->e_version = cpu_to_dump32(s, EV_CURRENT); | |
175 | elf_header->e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); | |
176 | elf_header->e_phoff = cpu_to_dump32(s, s->phdr_offset); | |
177 | elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); | |
178 | elf_header->e_phnum = cpu_to_dump16(s, phnum); | |
9b72224f JF |
179 | elf_header->e_shoff = cpu_to_dump32(s, s->shdr_offset); |
180 | elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); | |
181 | elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num); | |
182 | elf_header->e_shstrndx = cpu_to_dump16(s, s->shdr_num - 1); | |
670e7699 | 183 | } |
783e9b48 | 184 | |
670e7699 JF |
185 | static void write_elf_header(DumpState *s, Error **errp) |
186 | { | |
187 | Elf32_Ehdr elf32_header; | |
188 | Elf64_Ehdr elf64_header; | |
189 | size_t header_size; | |
190 | void *header_ptr; | |
191 | int ret; | |
192 | ||
9b72224f JF |
193 | /* The NULL header and the shstrtab are always defined */ |
194 | assert(s->shdr_num >= 2); | |
670e7699 JF |
195 | if (dump_is_64bit(s)) { |
196 | prepare_elf64_header(s, &elf64_header); | |
197 | header_size = sizeof(elf64_header); | |
198 | header_ptr = &elf64_header; | |
199 | } else { | |
200 | prepare_elf32_header(s, &elf32_header); | |
201 | header_size = sizeof(elf32_header); | |
202 | header_ptr = &elf32_header; | |
203 | } | |
204 | ||
205 | ret = fd_write_vmcore(header_ptr, header_size, s); | |
783e9b48 | 206 | if (ret < 0) { |
0c33659d | 207 | error_setg_errno(errp, -ret, "dump: failed to write elf header"); |
783e9b48 | 208 | } |
783e9b48 WC |
209 | } |
210 | ||
4c7e251a HZ |
211 | static void write_elf64_load(DumpState *s, MemoryMapping *memory_mapping, |
212 | int phdr_index, hwaddr offset, | |
213 | hwaddr filesz, Error **errp) | |
783e9b48 WC |
214 | { |
215 | Elf64_Phdr phdr; | |
216 | int ret; | |
783e9b48 WC |
217 | |
218 | memset(&phdr, 0, sizeof(Elf64_Phdr)); | |
acb0ef58 BR |
219 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); |
220 | phdr.p_offset = cpu_to_dump64(s, offset); | |
221 | phdr.p_paddr = cpu_to_dump64(s, memory_mapping->phys_addr); | |
222 | phdr.p_filesz = cpu_to_dump64(s, filesz); | |
223 | phdr.p_memsz = cpu_to_dump64(s, memory_mapping->length); | |
e17bebd0 | 224 | phdr.p_vaddr = cpu_to_dump64(s, memory_mapping->virt_addr) ?: phdr.p_paddr; |
783e9b48 | 225 | |
2cac2607 LE |
226 | assert(memory_mapping->length >= filesz); |
227 | ||
783e9b48 WC |
228 | ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s); |
229 | if (ret < 0) { | |
0c33659d YB |
230 | error_setg_errno(errp, -ret, |
231 | "dump: failed to write program header table"); | |
783e9b48 | 232 | } |
783e9b48 WC |
233 | } |
234 | ||
4c7e251a HZ |
235 | static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, |
236 | int phdr_index, hwaddr offset, | |
237 | hwaddr filesz, Error **errp) | |
783e9b48 WC |
238 | { |
239 | Elf32_Phdr phdr; | |
240 | int ret; | |
783e9b48 WC |
241 | |
242 | memset(&phdr, 0, sizeof(Elf32_Phdr)); | |
acb0ef58 BR |
243 | phdr.p_type = cpu_to_dump32(s, PT_LOAD); |
244 | phdr.p_offset = cpu_to_dump32(s, offset); | |
245 | phdr.p_paddr = cpu_to_dump32(s, memory_mapping->phys_addr); | |
246 | phdr.p_filesz = cpu_to_dump32(s, filesz); | |
247 | phdr.p_memsz = cpu_to_dump32(s, memory_mapping->length); | |
e17bebd0 JD |
248 | phdr.p_vaddr = |
249 | cpu_to_dump32(s, memory_mapping->virt_addr) ?: phdr.p_paddr; | |
783e9b48 | 250 | |
2cac2607 LE |
251 | assert(memory_mapping->length >= filesz); |
252 | ||
783e9b48 WC |
253 | ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s); |
254 | if (ret < 0) { | |
0c33659d YB |
255 | error_setg_errno(errp, -ret, |
256 | "dump: failed to write program header table"); | |
783e9b48 | 257 | } |
783e9b48 WC |
258 | } |
259 | ||
2341a94d | 260 | static void prepare_elf64_phdr_note(DumpState *s, Elf64_Phdr *phdr) |
783e9b48 | 261 | { |
bc7d5580 JF |
262 | memset(phdr, 0, sizeof(*phdr)); |
263 | phdr->p_type = cpu_to_dump32(s, PT_NOTE); | |
264 | phdr->p_offset = cpu_to_dump64(s, s->note_offset); | |
265 | phdr->p_paddr = 0; | |
266 | phdr->p_filesz = cpu_to_dump64(s, s->note_size); | |
267 | phdr->p_memsz = cpu_to_dump64(s, s->note_size); | |
268 | phdr->p_vaddr = 0; | |
783e9b48 WC |
269 | } |
270 | ||
0bc3cd62 PB |
271 | static inline int cpu_index(CPUState *cpu) |
272 | { | |
273 | return cpu->cpu_index + 1; | |
274 | } | |
275 | ||
903ef734 MAL |
276 | static void write_guest_note(WriteCoreDumpFunction f, DumpState *s, |
277 | Error **errp) | |
278 | { | |
279 | int ret; | |
280 | ||
281 | if (s->guest_note) { | |
282 | ret = f(s->guest_note, s->guest_note_size, s); | |
283 | if (ret < 0) { | |
284 | error_setg(errp, "dump: failed to write guest note"); | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
4c7e251a HZ |
289 | static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, |
290 | Error **errp) | |
783e9b48 | 291 | { |
0d34282f | 292 | CPUState *cpu; |
783e9b48 WC |
293 | int ret; |
294 | int id; | |
295 | ||
bdc44640 | 296 | CPU_FOREACH(cpu) { |
0d34282f | 297 | id = cpu_index(cpu); |
6a519918 | 298 | ret = cpu_write_elf64_note(f, cpu, id, s); |
783e9b48 | 299 | if (ret < 0) { |
e3517a52 | 300 | error_setg(errp, "dump: failed to write elf notes"); |
4c7e251a | 301 | return; |
783e9b48 WC |
302 | } |
303 | } | |
304 | ||
bdc44640 | 305 | CPU_FOREACH(cpu) { |
6a519918 | 306 | ret = cpu_write_elf64_qemunote(f, cpu, s); |
783e9b48 | 307 | if (ret < 0) { |
e3517a52 | 308 | error_setg(errp, "dump: failed to write CPU status"); |
4c7e251a | 309 | return; |
783e9b48 WC |
310 | } |
311 | } | |
903ef734 MAL |
312 | |
313 | write_guest_note(f, s, errp); | |
783e9b48 WC |
314 | } |
315 | ||
2341a94d | 316 | static void prepare_elf32_phdr_note(DumpState *s, Elf32_Phdr *phdr) |
783e9b48 | 317 | { |
bc7d5580 JF |
318 | memset(phdr, 0, sizeof(*phdr)); |
319 | phdr->p_type = cpu_to_dump32(s, PT_NOTE); | |
320 | phdr->p_offset = cpu_to_dump32(s, s->note_offset); | |
321 | phdr->p_paddr = 0; | |
322 | phdr->p_filesz = cpu_to_dump32(s, s->note_size); | |
323 | phdr->p_memsz = cpu_to_dump32(s, s->note_size); | |
324 | phdr->p_vaddr = 0; | |
783e9b48 WC |
325 | } |
326 | ||
4c7e251a HZ |
327 | static void write_elf32_notes(WriteCoreDumpFunction f, DumpState *s, |
328 | Error **errp) | |
783e9b48 | 329 | { |
0d34282f | 330 | CPUState *cpu; |
783e9b48 WC |
331 | int ret; |
332 | int id; | |
333 | ||
bdc44640 | 334 | CPU_FOREACH(cpu) { |
0d34282f | 335 | id = cpu_index(cpu); |
6a519918 | 336 | ret = cpu_write_elf32_note(f, cpu, id, s); |
783e9b48 | 337 | if (ret < 0) { |
e3517a52 | 338 | error_setg(errp, "dump: failed to write elf notes"); |
4c7e251a | 339 | return; |
783e9b48 WC |
340 | } |
341 | } | |
342 | ||
bdc44640 | 343 | CPU_FOREACH(cpu) { |
6a519918 | 344 | ret = cpu_write_elf32_qemunote(f, cpu, s); |
783e9b48 | 345 | if (ret < 0) { |
e3517a52 | 346 | error_setg(errp, "dump: failed to write CPU status"); |
4c7e251a | 347 | return; |
783e9b48 WC |
348 | } |
349 | } | |
903ef734 MAL |
350 | |
351 | write_guest_note(f, s, errp); | |
783e9b48 WC |
352 | } |
353 | ||
bc7d5580 JF |
354 | static void write_elf_phdr_note(DumpState *s, Error **errp) |
355 | { | |
bc7d5580 JF |
356 | Elf32_Phdr phdr32; |
357 | Elf64_Phdr phdr64; | |
358 | void *phdr; | |
359 | size_t size; | |
360 | int ret; | |
361 | ||
362 | if (dump_is_64bit(s)) { | |
2341a94d | 363 | prepare_elf64_phdr_note(s, &phdr64); |
bc7d5580 JF |
364 | size = sizeof(phdr64); |
365 | phdr = &phdr64; | |
366 | } else { | |
2341a94d | 367 | prepare_elf32_phdr_note(s, &phdr32); |
bc7d5580 JF |
368 | size = sizeof(phdr32); |
369 | phdr = &phdr32; | |
370 | } | |
371 | ||
372 | ret = fd_write_vmcore(phdr, size, s); | |
373 | if (ret < 0) { | |
374 | error_setg_errno(errp, -ret, | |
375 | "dump: failed to write program header table"); | |
376 | } | |
377 | } | |
378 | ||
e41ed29b | 379 | static void prepare_elf_section_hdr_zero(DumpState *s) |
783e9b48 | 380 | { |
e41ed29b JF |
381 | if (dump_is_64bit(s)) { |
382 | Elf64_Shdr *shdr64 = s->elf_section_hdrs; | |
783e9b48 | 383 | |
e41ed29b | 384 | shdr64->sh_info = cpu_to_dump32(s, s->phdr_num); |
783e9b48 | 385 | } else { |
e41ed29b JF |
386 | Elf32_Shdr *shdr32 = s->elf_section_hdrs; |
387 | ||
388 | shdr32->sh_info = cpu_to_dump32(s, s->phdr_num); | |
389 | } | |
390 | } | |
391 | ||
9b72224f JF |
392 | static void prepare_elf_section_hdr_string(DumpState *s, void *buff) |
393 | { | |
394 | uint64_t index = s->string_table_buf->len; | |
395 | const char strtab[] = ".shstrtab"; | |
396 | Elf32_Shdr shdr32 = {}; | |
397 | Elf64_Shdr shdr64 = {}; | |
398 | int shdr_size; | |
399 | void *shdr; | |
400 | ||
401 | g_array_append_vals(s->string_table_buf, strtab, sizeof(strtab)); | |
402 | if (dump_is_64bit(s)) { | |
403 | shdr_size = sizeof(Elf64_Shdr); | |
404 | shdr64.sh_type = SHT_STRTAB; | |
405 | shdr64.sh_offset = s->section_offset + s->elf_section_data_size; | |
406 | shdr64.sh_name = index; | |
407 | shdr64.sh_size = s->string_table_buf->len; | |
408 | shdr = &shdr64; | |
409 | } else { | |
410 | shdr_size = sizeof(Elf32_Shdr); | |
411 | shdr32.sh_type = SHT_STRTAB; | |
412 | shdr32.sh_offset = s->section_offset + s->elf_section_data_size; | |
413 | shdr32.sh_name = index; | |
414 | shdr32.sh_size = s->string_table_buf->len; | |
415 | shdr = &shdr32; | |
416 | } | |
417 | memcpy(buff, shdr, shdr_size); | |
418 | } | |
419 | ||
420 | static bool prepare_elf_section_hdrs(DumpState *s, Error **errp) | |
e41ed29b JF |
421 | { |
422 | size_t len, sizeof_shdr; | |
9b72224f | 423 | void *buff_hdr; |
e41ed29b JF |
424 | |
425 | /* | |
426 | * Section ordering: | |
427 | * - HDR zero | |
9b72224f JF |
428 | * - Arch section hdrs |
429 | * - String table hdr | |
e41ed29b JF |
430 | */ |
431 | sizeof_shdr = dump_is_64bit(s) ? sizeof(Elf64_Shdr) : sizeof(Elf32_Shdr); | |
432 | len = sizeof_shdr * s->shdr_num; | |
433 | s->elf_section_hdrs = g_malloc0(len); | |
9b72224f | 434 | buff_hdr = s->elf_section_hdrs; |
e41ed29b JF |
435 | |
436 | /* | |
437 | * The first section header is ALWAYS a special initial section | |
438 | * header. | |
439 | * | |
440 | * The header should be 0 with one exception being that if | |
441 | * phdr_num is PN_XNUM then the sh_info field contains the real | |
442 | * number of segment entries. | |
443 | * | |
444 | * As we zero allocate the buffer we will only need to modify | |
445 | * sh_info for the PN_XNUM case. | |
446 | */ | |
447 | if (s->phdr_num >= PN_XNUM) { | |
448 | prepare_elf_section_hdr_zero(s); | |
783e9b48 | 449 | } |
9b72224f JF |
450 | buff_hdr += sizeof_shdr; |
451 | ||
452 | /* Add architecture defined section headers */ | |
453 | if (s->dump_info.arch_sections_write_hdr_fn | |
454 | && s->shdr_num > 2) { | |
455 | buff_hdr += s->dump_info.arch_sections_write_hdr_fn(s, buff_hdr); | |
456 | ||
457 | if (s->shdr_num >= SHN_LORESERVE) { | |
458 | error_setg_errno(errp, EINVAL, | |
459 | "dump: too many architecture defined sections"); | |
460 | return false; | |
461 | } | |
462 | } | |
463 | ||
464 | /* | |
465 | * String table is the last section since strings are added via | |
466 | * arch_sections_write_hdr(). | |
467 | */ | |
468 | prepare_elf_section_hdr_string(s, buff_hdr); | |
469 | return true; | |
e41ed29b | 470 | } |
783e9b48 | 471 | |
e41ed29b JF |
472 | static void write_elf_section_headers(DumpState *s, Error **errp) |
473 | { | |
474 | size_t sizeof_shdr = dump_is_64bit(s) ? sizeof(Elf64_Shdr) : sizeof(Elf32_Shdr); | |
475 | int ret; | |
476 | ||
9b72224f JF |
477 | if (!prepare_elf_section_hdrs(s, errp)) { |
478 | return; | |
479 | } | |
e41ed29b JF |
480 | |
481 | ret = fd_write_vmcore(s->elf_section_hdrs, s->shdr_num * sizeof_shdr, s); | |
783e9b48 | 482 | if (ret < 0) { |
e41ed29b | 483 | error_setg_errno(errp, -ret, "dump: failed to write section headers"); |
783e9b48 | 484 | } |
e41ed29b JF |
485 | |
486 | g_free(s->elf_section_hdrs); | |
783e9b48 WC |
487 | } |
488 | ||
9b72224f JF |
489 | static void write_elf_sections(DumpState *s, Error **errp) |
490 | { | |
491 | int ret; | |
492 | ||
493 | if (s->elf_section_data_size) { | |
494 | /* Write architecture section data */ | |
495 | ret = fd_write_vmcore(s->elf_section_data, | |
496 | s->elf_section_data_size, s); | |
497 | if (ret < 0) { | |
498 | error_setg_errno(errp, -ret, | |
499 | "dump: failed to write architecture section data"); | |
500 | return; | |
501 | } | |
502 | } | |
503 | ||
504 | /* Write string table */ | |
505 | ret = fd_write_vmcore(s->string_table_buf->data, | |
506 | s->string_table_buf->len, s); | |
507 | if (ret < 0) { | |
508 | error_setg_errno(errp, -ret, "dump: failed to write string table data"); | |
509 | } | |
510 | } | |
511 | ||
4c7e251a | 512 | static void write_data(DumpState *s, void *buf, int length, Error **errp) |
783e9b48 WC |
513 | { |
514 | int ret; | |
515 | ||
516 | ret = fd_write_vmcore(buf, length, s); | |
517 | if (ret < 0) { | |
0c33659d | 518 | error_setg_errno(errp, -ret, "dump: failed to save memory"); |
2264c2c9 PX |
519 | } else { |
520 | s->written_size += length; | |
783e9b48 | 521 | } |
783e9b48 WC |
522 | } |
523 | ||
4c7e251a HZ |
524 | /* write the memory to vmcore. 1 page per I/O. */ |
525 | static void write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start, | |
526 | int64_t size, Error **errp) | |
783e9b48 | 527 | { |
86a518bb | 528 | ERRP_GUARD(); |
783e9b48 | 529 | int64_t i; |
783e9b48 | 530 | |
8161befd AJ |
531 | for (i = 0; i < size / s->dump_info.page_size; i++) { |
532 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
86a518bb JF |
533 | s->dump_info.page_size, errp); |
534 | if (*errp) { | |
4c7e251a | 535 | return; |
783e9b48 WC |
536 | } |
537 | } | |
538 | ||
8161befd AJ |
539 | if ((size % s->dump_info.page_size) != 0) { |
540 | write_data(s, block->host_addr + start + i * s->dump_info.page_size, | |
86a518bb JF |
541 | size % s->dump_info.page_size, errp); |
542 | if (*errp) { | |
4c7e251a | 543 | return; |
783e9b48 WC |
544 | } |
545 | } | |
783e9b48 WC |
546 | } |
547 | ||
2cac2607 LE |
548 | /* get the memory's offset and size in the vmcore */ |
549 | static void get_offset_range(hwaddr phys_addr, | |
550 | ram_addr_t mapping_length, | |
551 | DumpState *s, | |
552 | hwaddr *p_offset, | |
553 | hwaddr *p_filesz) | |
783e9b48 | 554 | { |
56c4bfb3 | 555 | GuestPhysBlock *block; |
a8170e5e | 556 | hwaddr offset = s->memory_offset; |
783e9b48 WC |
557 | int64_t size_in_block, start; |
558 | ||
2cac2607 LE |
559 | /* When the memory is not stored into vmcore, offset will be -1 */ |
560 | *p_offset = -1; | |
561 | *p_filesz = 0; | |
562 | ||
dddf725f JF |
563 | if (dump_has_filter(s)) { |
564 | if (phys_addr < s->filter_area_begin || | |
565 | phys_addr >= s->filter_area_begin + s->filter_area_length) { | |
2cac2607 | 566 | return; |
783e9b48 WC |
567 | } |
568 | } | |
569 | ||
56c4bfb3 | 570 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { |
dddf725f JF |
571 | if (dump_has_filter(s)) { |
572 | if (block->target_start >= s->filter_area_begin + s->filter_area_length || | |
573 | block->target_end <= s->filter_area_begin) { | |
783e9b48 WC |
574 | /* This block is out of the range */ |
575 | continue; | |
576 | } | |
577 | ||
dddf725f | 578 | if (s->filter_area_begin <= block->target_start) { |
56c4bfb3 | 579 | start = block->target_start; |
783e9b48 | 580 | } else { |
dddf725f | 581 | start = s->filter_area_begin; |
783e9b48 WC |
582 | } |
583 | ||
56c4bfb3 | 584 | size_in_block = block->target_end - start; |
dddf725f JF |
585 | if (s->filter_area_begin + s->filter_area_length < block->target_end) { |
586 | size_in_block -= block->target_end - (s->filter_area_begin + s->filter_area_length); | |
783e9b48 WC |
587 | } |
588 | } else { | |
56c4bfb3 LE |
589 | start = block->target_start; |
590 | size_in_block = block->target_end - block->target_start; | |
783e9b48 WC |
591 | } |
592 | ||
593 | if (phys_addr >= start && phys_addr < start + size_in_block) { | |
2cac2607 LE |
594 | *p_offset = phys_addr - start + offset; |
595 | ||
596 | /* The offset range mapped from the vmcore file must not spill over | |
56c4bfb3 | 597 | * the GuestPhysBlock, clamp it. The rest of the mapping will be |
2cac2607 LE |
598 | * zero-filled in memory at load time; see |
599 | * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>. | |
600 | */ | |
601 | *p_filesz = phys_addr + mapping_length <= start + size_in_block ? | |
602 | mapping_length : | |
603 | size_in_block - (phys_addr - start); | |
604 | return; | |
783e9b48 WC |
605 | } |
606 | ||
607 | offset += size_in_block; | |
608 | } | |
783e9b48 WC |
609 | } |
610 | ||
afae6056 | 611 | static void write_elf_phdr_loads(DumpState *s, Error **errp) |
783e9b48 | 612 | { |
86a518bb | 613 | ERRP_GUARD(); |
2cac2607 | 614 | hwaddr offset, filesz; |
783e9b48 WC |
615 | MemoryMapping *memory_mapping; |
616 | uint32_t phdr_index = 1; | |
783e9b48 WC |
617 | |
618 | QTAILQ_FOREACH(memory_mapping, &s->list.head, next) { | |
2cac2607 LE |
619 | get_offset_range(memory_mapping->phys_addr, |
620 | memory_mapping->length, | |
621 | s, &offset, &filesz); | |
05bbaa50 | 622 | if (dump_is_64bit(s)) { |
4c7e251a | 623 | write_elf64_load(s, memory_mapping, phdr_index++, offset, |
86a518bb | 624 | filesz, errp); |
783e9b48 | 625 | } else { |
4c7e251a | 626 | write_elf32_load(s, memory_mapping, phdr_index++, offset, |
86a518bb | 627 | filesz, errp); |
783e9b48 WC |
628 | } |
629 | ||
86a518bb | 630 | if (*errp) { |
4c7e251a | 631 | return; |
783e9b48 WC |
632 | } |
633 | ||
046bc416 | 634 | if (phdr_index >= s->phdr_num) { |
783e9b48 WC |
635 | break; |
636 | } | |
637 | } | |
783e9b48 WC |
638 | } |
639 | ||
c6812473 JF |
640 | static void write_elf_notes(DumpState *s, Error **errp) |
641 | { | |
642 | if (dump_is_64bit(s)) { | |
643 | write_elf64_notes(fd_write_vmcore, s, errp); | |
644 | } else { | |
645 | write_elf32_notes(fd_write_vmcore, s, errp); | |
646 | } | |
647 | } | |
648 | ||
783e9b48 | 649 | /* write elf header, PT_NOTE and elf note to vmcore. */ |
4c7e251a | 650 | static void dump_begin(DumpState *s, Error **errp) |
783e9b48 | 651 | { |
86a518bb | 652 | ERRP_GUARD(); |
783e9b48 WC |
653 | |
654 | /* | |
655 | * the vmcore's format is: | |
656 | * -------------- | |
657 | * | elf header | | |
658 | * -------------- | |
cb415fd6 JF |
659 | * | sctn_hdr | |
660 | * -------------- | |
783e9b48 WC |
661 | * | PT_NOTE | |
662 | * -------------- | |
663 | * | PT_LOAD | | |
664 | * -------------- | |
665 | * | ...... | | |
666 | * -------------- | |
667 | * | PT_LOAD | | |
668 | * -------------- | |
783e9b48 WC |
669 | * | elf note | |
670 | * -------------- | |
671 | * | memory | | |
672 | * -------------- | |
673 | * | |
674 | * we only know where the memory is saved after we write elf note into | |
675 | * vmcore. | |
676 | */ | |
677 | ||
678 | /* write elf header to vmcore */ | |
670e7699 | 679 | write_elf_header(s, errp); |
86a518bb | 680 | if (*errp) { |
4c7e251a | 681 | return; |
783e9b48 WC |
682 | } |
683 | ||
cb415fd6 JF |
684 | /* write section headers to vmcore */ |
685 | write_elf_section_headers(s, errp); | |
bc7d5580 JF |
686 | if (*errp) { |
687 | return; | |
688 | } | |
783e9b48 | 689 | |
cb415fd6 JF |
690 | /* write PT_NOTE to vmcore */ |
691 | write_elf_phdr_note(s, errp); | |
5ff2e5a3 JF |
692 | if (*errp) { |
693 | return; | |
694 | } | |
695 | ||
cb415fd6 JF |
696 | /* write all PT_LOADs to vmcore */ |
697 | write_elf_phdr_loads(s, errp); | |
e41ed29b JF |
698 | if (*errp) { |
699 | return; | |
5ff2e5a3 | 700 | } |
783e9b48 | 701 | |
c6812473 JF |
702 | /* write notes to vmcore */ |
703 | write_elf_notes(s, errp); | |
783e9b48 WC |
704 | } |
705 | ||
113d8f4e JF |
706 | int64_t dump_filtered_memblock_size(GuestPhysBlock *block, |
707 | int64_t filter_area_start, | |
708 | int64_t filter_area_length) | |
783e9b48 | 709 | { |
1e811303 | 710 | int64_t size, left, right; |
783e9b48 | 711 | |
1e811303 JF |
712 | /* No filter, return full size */ |
713 | if (!filter_area_length) { | |
714 | return block->target_end - block->target_start; | |
715 | } | |
783e9b48 | 716 | |
1e811303 JF |
717 | /* calculate the overlapped region. */ |
718 | left = MAX(filter_area_start, block->target_start); | |
719 | right = MIN(filter_area_start + filter_area_length, block->target_end); | |
720 | size = right - left; | |
721 | size = size > 0 ? size : 0; | |
722 | ||
723 | return size; | |
724 | } | |
725 | ||
113d8f4e JF |
726 | int64_t dump_filtered_memblock_start(GuestPhysBlock *block, |
727 | int64_t filter_area_start, | |
728 | int64_t filter_area_length) | |
1e811303 JF |
729 | { |
730 | if (filter_area_length) { | |
731 | /* return -1 if the block is not within filter area */ | |
732 | if (block->target_start >= filter_area_start + filter_area_length || | |
733 | block->target_end <= filter_area_start) { | |
734 | return -1; | |
783e9b48 WC |
735 | } |
736 | ||
1e811303 JF |
737 | if (filter_area_start > block->target_start) { |
738 | return filter_area_start - block->target_start; | |
739 | } | |
783e9b48 | 740 | } |
1e811303 JF |
741 | |
742 | return 0; | |
783e9b48 WC |
743 | } |
744 | ||
745 | /* write all memory to vmcore */ | |
4c7e251a | 746 | static void dump_iterate(DumpState *s, Error **errp) |
783e9b48 | 747 | { |
86a518bb | 748 | ERRP_GUARD(); |
56c4bfb3 | 749 | GuestPhysBlock *block; |
1e811303 | 750 | int64_t memblock_size, memblock_start; |
783e9b48 | 751 | |
1e811303 | 752 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { |
dddf725f | 753 | memblock_start = dump_filtered_memblock_start(block, s->filter_area_begin, s->filter_area_length); |
1e811303 JF |
754 | if (memblock_start == -1) { |
755 | continue; | |
783e9b48 | 756 | } |
1e811303 | 757 | |
dddf725f | 758 | memblock_size = dump_filtered_memblock_size(block, s->filter_area_begin, s->filter_area_length); |
1e811303 JF |
759 | |
760 | /* Write the memory to file */ | |
761 | write_memory(s, block, memblock_start, memblock_size, errp); | |
86a518bb | 762 | if (*errp) { |
4c7e251a | 763 | return; |
783e9b48 | 764 | } |
1e811303 | 765 | } |
783e9b48 WC |
766 | } |
767 | ||
9b72224f JF |
768 | static void dump_end(DumpState *s, Error **errp) |
769 | { | |
770 | int rc; | |
9b72224f JF |
771 | |
772 | if (s->elf_section_data_size) { | |
773 | s->elf_section_data = g_malloc0(s->elf_section_data_size); | |
774 | } | |
775 | ||
776 | /* Adds the architecture defined section data to s->elf_section_data */ | |
777 | if (s->dump_info.arch_sections_write_fn && | |
778 | s->elf_section_data_size) { | |
779 | rc = s->dump_info.arch_sections_write_fn(s, s->elf_section_data); | |
780 | if (rc) { | |
781 | error_setg_errno(errp, rc, | |
782 | "dump: failed to get arch section data"); | |
783 | g_free(s->elf_section_data); | |
784 | return; | |
785 | } | |
786 | } | |
787 | ||
788 | /* write sections to vmcore */ | |
789 | write_elf_sections(s, errp); | |
790 | } | |
791 | ||
4c7e251a | 792 | static void create_vmcore(DumpState *s, Error **errp) |
783e9b48 | 793 | { |
86a518bb | 794 | ERRP_GUARD(); |
783e9b48 | 795 | |
86a518bb JF |
796 | dump_begin(s, errp); |
797 | if (*errp) { | |
4c7e251a | 798 | return; |
783e9b48 WC |
799 | } |
800 | ||
9b72224f | 801 | /* Iterate over memory and dump it to file */ |
4c7e251a | 802 | dump_iterate(s, errp); |
9b72224f JF |
803 | if (*errp) { |
804 | return; | |
805 | } | |
806 | ||
807 | /* Write the section data */ | |
808 | dump_end(s, errp); | |
783e9b48 WC |
809 | } |
810 | ||
fda05387 QN |
811 | static int write_start_flat_header(int fd) |
812 | { | |
92ba1401 | 813 | MakedumpfileHeader *mh; |
fda05387 QN |
814 | int ret = 0; |
815 | ||
92ba1401 LE |
816 | QEMU_BUILD_BUG_ON(sizeof *mh > MAX_SIZE_MDF_HEADER); |
817 | mh = g_malloc0(MAX_SIZE_MDF_HEADER); | |
fda05387 | 818 | |
92ba1401 LE |
819 | memcpy(mh->signature, MAKEDUMPFILE_SIGNATURE, |
820 | MIN(sizeof mh->signature, sizeof MAKEDUMPFILE_SIGNATURE)); | |
fda05387 | 821 | |
92ba1401 LE |
822 | mh->type = cpu_to_be64(TYPE_FLAT_HEADER); |
823 | mh->version = cpu_to_be64(VERSION_FLAT_HEADER); | |
fda05387 QN |
824 | |
825 | size_t written_size; | |
92ba1401 | 826 | written_size = qemu_write_full(fd, mh, MAX_SIZE_MDF_HEADER); |
fda05387 QN |
827 | if (written_size != MAX_SIZE_MDF_HEADER) { |
828 | ret = -1; | |
829 | } | |
830 | ||
92ba1401 | 831 | g_free(mh); |
fda05387 QN |
832 | return ret; |
833 | } | |
834 | ||
835 | static int write_end_flat_header(int fd) | |
836 | { | |
837 | MakedumpfileDataHeader mdh; | |
838 | ||
839 | mdh.offset = END_FLAG_FLAT_HEADER; | |
840 | mdh.buf_size = END_FLAG_FLAT_HEADER; | |
841 | ||
842 | size_t written_size; | |
843 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
844 | if (written_size != sizeof(mdh)) { | |
845 | return -1; | |
846 | } | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
5d31babe QN |
851 | static int write_buffer(int fd, off_t offset, const void *buf, size_t size) |
852 | { | |
853 | size_t written_size; | |
854 | MakedumpfileDataHeader mdh; | |
855 | ||
856 | mdh.offset = cpu_to_be64(offset); | |
857 | mdh.buf_size = cpu_to_be64(size); | |
858 | ||
859 | written_size = qemu_write_full(fd, &mdh, sizeof(mdh)); | |
860 | if (written_size != sizeof(mdh)) { | |
861 | return -1; | |
862 | } | |
863 | ||
864 | written_size = qemu_write_full(fd, buf, size); | |
865 | if (written_size != size) { | |
866 | return -1; | |
867 | } | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
4835ef77 QN |
872 | static int buf_write_note(const void *buf, size_t size, void *opaque) |
873 | { | |
874 | DumpState *s = opaque; | |
875 | ||
876 | /* note_buf is not enough */ | |
877 | if (s->note_buf_offset + size > s->note_size) { | |
878 | return -1; | |
879 | } | |
880 | ||
881 | memcpy(s->note_buf + s->note_buf_offset, buf, size); | |
882 | ||
883 | s->note_buf_offset += size; | |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
903ef734 MAL |
888 | /* |
889 | * This function retrieves various sizes from an elf header. | |
890 | * | |
891 | * @note has to be a valid ELF note. The return sizes are unmodified | |
892 | * (not padded or rounded up to be multiple of 4). | |
893 | */ | |
894 | static void get_note_sizes(DumpState *s, const void *note, | |
895 | uint64_t *note_head_size, | |
896 | uint64_t *name_size, | |
897 | uint64_t *desc_size) | |
898 | { | |
899 | uint64_t note_head_sz; | |
900 | uint64_t name_sz; | |
901 | uint64_t desc_sz; | |
902 | ||
05bbaa50 | 903 | if (dump_is_64bit(s)) { |
903ef734 MAL |
904 | const Elf64_Nhdr *hdr = note; |
905 | note_head_sz = sizeof(Elf64_Nhdr); | |
bb509d94 PMD |
906 | name_sz = cpu_to_dump64(s, hdr->n_namesz); |
907 | desc_sz = cpu_to_dump64(s, hdr->n_descsz); | |
903ef734 MAL |
908 | } else { |
909 | const Elf32_Nhdr *hdr = note; | |
910 | note_head_sz = sizeof(Elf32_Nhdr); | |
bb509d94 PMD |
911 | name_sz = cpu_to_dump32(s, hdr->n_namesz); |
912 | desc_sz = cpu_to_dump32(s, hdr->n_descsz); | |
903ef734 MAL |
913 | } |
914 | ||
915 | if (note_head_size) { | |
916 | *note_head_size = note_head_sz; | |
917 | } | |
918 | if (name_size) { | |
919 | *name_size = name_sz; | |
920 | } | |
921 | if (desc_size) { | |
922 | *desc_size = desc_sz; | |
923 | } | |
924 | } | |
925 | ||
d9feb517 MAL |
926 | static bool note_name_equal(DumpState *s, |
927 | const uint8_t *note, const char *name) | |
928 | { | |
929 | int len = strlen(name) + 1; | |
930 | uint64_t head_size, name_size; | |
931 | ||
932 | get_note_sizes(s, note, &head_size, &name_size, NULL); | |
933 | head_size = ROUND_UP(head_size, 4); | |
934 | ||
c983ca84 | 935 | return name_size == len && memcmp(note + head_size, name, len) == 0; |
d9feb517 MAL |
936 | } |
937 | ||
298f1168 | 938 | /* write common header, sub header and elf note to vmcore */ |
4c7e251a | 939 | static void create_header32(DumpState *s, Error **errp) |
298f1168 | 940 | { |
86a518bb | 941 | ERRP_GUARD(); |
298f1168 QN |
942 | DiskDumpHeader32 *dh = NULL; |
943 | KdumpSubHeader32 *kh = NULL; | |
944 | size_t size; | |
298f1168 QN |
945 | uint32_t block_size; |
946 | uint32_t sub_hdr_size; | |
947 | uint32_t bitmap_blocks; | |
948 | uint32_t status = 0; | |
949 | uint64_t offset_note; | |
950 | ||
951 | /* write common header, the version of kdump-compressed format is 6th */ | |
952 | size = sizeof(DiskDumpHeader32); | |
953 | dh = g_malloc0(size); | |
954 | ||
84c868f6 | 955 | memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); |
acb0ef58 | 956 | dh->header_version = cpu_to_dump32(s, 6); |
8161befd | 957 | block_size = s->dump_info.page_size; |
acb0ef58 | 958 | dh->block_size = cpu_to_dump32(s, block_size); |
298f1168 QN |
959 | sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size; |
960 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
acb0ef58 | 961 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); |
298f1168 | 962 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ |
acb0ef58 BR |
963 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); |
964 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
298f1168 | 965 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; |
acb0ef58 | 966 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); |
4ab23a91 | 967 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); |
298f1168 QN |
968 | |
969 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
970 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
971 | } | |
972 | #ifdef CONFIG_LZO | |
973 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
974 | status |= DUMP_DH_COMPRESSED_LZO; | |
975 | } | |
976 | #endif | |
977 | #ifdef CONFIG_SNAPPY | |
978 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
979 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
980 | } | |
981 | #endif | |
acb0ef58 | 982 | dh->status = cpu_to_dump32(s, status); |
298f1168 QN |
983 | |
984 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
e3517a52 | 985 | error_setg(errp, "dump: failed to write disk dump header"); |
298f1168 QN |
986 | goto out; |
987 | } | |
988 | ||
989 | /* write sub header */ | |
990 | size = sizeof(KdumpSubHeader32); | |
991 | kh = g_malloc0(size); | |
992 | ||
993 | /* 64bit max_mapnr_64 */ | |
acb0ef58 | 994 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); |
b6e05aa4 | 995 | kh->phys_base = cpu_to_dump32(s, s->dump_info.phys_base); |
acb0ef58 | 996 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); |
298f1168 QN |
997 | |
998 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
9ada575b MAL |
999 | if (s->guest_note && |
1000 | note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
1001 | uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; | |
1002 | ||
1003 | get_note_sizes(s, s->guest_note, | |
1004 | &hsize, &name_size, &size_vmcoreinfo_desc); | |
1005 | offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + | |
1006 | (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; | |
1007 | kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); | |
1008 | kh->size_vmcoreinfo = cpu_to_dump32(s, size_vmcoreinfo_desc); | |
1009 | } | |
1010 | ||
acb0ef58 BR |
1011 | kh->offset_note = cpu_to_dump64(s, offset_note); |
1012 | kh->note_size = cpu_to_dump32(s, s->note_size); | |
298f1168 QN |
1013 | |
1014 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
1015 | block_size, kh, size) < 0) { | |
e3517a52 | 1016 | error_setg(errp, "dump: failed to write kdump sub header"); |
298f1168 QN |
1017 | goto out; |
1018 | } | |
1019 | ||
1020 | /* write note */ | |
1021 | s->note_buf = g_malloc0(s->note_size); | |
1022 | s->note_buf_offset = 0; | |
1023 | ||
1024 | /* use s->note_buf to store notes temporarily */ | |
86a518bb JF |
1025 | write_elf32_notes(buf_write_note, s, errp); |
1026 | if (*errp) { | |
298f1168 QN |
1027 | goto out; |
1028 | } | |
298f1168 QN |
1029 | if (write_buffer(s->fd, offset_note, s->note_buf, |
1030 | s->note_size) < 0) { | |
e3517a52 | 1031 | error_setg(errp, "dump: failed to write notes"); |
298f1168 QN |
1032 | goto out; |
1033 | } | |
1034 | ||
1035 | /* get offset of dump_bitmap */ | |
1036 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
1037 | block_size; | |
1038 | ||
1039 | /* get offset of page */ | |
1040 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
1041 | block_size; | |
1042 | ||
1043 | out: | |
1044 | g_free(dh); | |
1045 | g_free(kh); | |
1046 | g_free(s->note_buf); | |
298f1168 QN |
1047 | } |
1048 | ||
1049 | /* write common header, sub header and elf note to vmcore */ | |
4c7e251a | 1050 | static void create_header64(DumpState *s, Error **errp) |
298f1168 | 1051 | { |
86a518bb | 1052 | ERRP_GUARD(); |
298f1168 QN |
1053 | DiskDumpHeader64 *dh = NULL; |
1054 | KdumpSubHeader64 *kh = NULL; | |
1055 | size_t size; | |
298f1168 QN |
1056 | uint32_t block_size; |
1057 | uint32_t sub_hdr_size; | |
1058 | uint32_t bitmap_blocks; | |
1059 | uint32_t status = 0; | |
1060 | uint64_t offset_note; | |
1061 | ||
1062 | /* write common header, the version of kdump-compressed format is 6th */ | |
1063 | size = sizeof(DiskDumpHeader64); | |
1064 | dh = g_malloc0(size); | |
1065 | ||
84c868f6 | 1066 | memcpy(dh->signature, KDUMP_SIGNATURE, SIG_LEN); |
acb0ef58 | 1067 | dh->header_version = cpu_to_dump32(s, 6); |
8161befd | 1068 | block_size = s->dump_info.page_size; |
acb0ef58 | 1069 | dh->block_size = cpu_to_dump32(s, block_size); |
298f1168 QN |
1070 | sub_hdr_size = sizeof(struct KdumpSubHeader64) + s->note_size; |
1071 | sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size); | |
acb0ef58 | 1072 | dh->sub_hdr_size = cpu_to_dump32(s, sub_hdr_size); |
298f1168 | 1073 | /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */ |
acb0ef58 BR |
1074 | dh->max_mapnr = cpu_to_dump32(s, MIN(s->max_mapnr, UINT_MAX)); |
1075 | dh->nr_cpus = cpu_to_dump32(s, s->nr_cpus); | |
298f1168 | 1076 | bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2; |
acb0ef58 | 1077 | dh->bitmap_blocks = cpu_to_dump32(s, bitmap_blocks); |
4ab23a91 | 1078 | strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine)); |
298f1168 QN |
1079 | |
1080 | if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) { | |
1081 | status |= DUMP_DH_COMPRESSED_ZLIB; | |
1082 | } | |
1083 | #ifdef CONFIG_LZO | |
1084 | if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) { | |
1085 | status |= DUMP_DH_COMPRESSED_LZO; | |
1086 | } | |
1087 | #endif | |
1088 | #ifdef CONFIG_SNAPPY | |
1089 | if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) { | |
1090 | status |= DUMP_DH_COMPRESSED_SNAPPY; | |
1091 | } | |
1092 | #endif | |
acb0ef58 | 1093 | dh->status = cpu_to_dump32(s, status); |
298f1168 QN |
1094 | |
1095 | if (write_buffer(s->fd, 0, dh, size) < 0) { | |
e3517a52 | 1096 | error_setg(errp, "dump: failed to write disk dump header"); |
298f1168 QN |
1097 | goto out; |
1098 | } | |
1099 | ||
1100 | /* write sub header */ | |
1101 | size = sizeof(KdumpSubHeader64); | |
1102 | kh = g_malloc0(size); | |
1103 | ||
1104 | /* 64bit max_mapnr_64 */ | |
acb0ef58 | 1105 | kh->max_mapnr_64 = cpu_to_dump64(s, s->max_mapnr); |
b6e05aa4 | 1106 | kh->phys_base = cpu_to_dump64(s, s->dump_info.phys_base); |
acb0ef58 | 1107 | kh->dump_level = cpu_to_dump32(s, DUMP_LEVEL); |
298f1168 QN |
1108 | |
1109 | offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size; | |
9ada575b MAL |
1110 | if (s->guest_note && |
1111 | note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
1112 | uint64_t hsize, name_size, size_vmcoreinfo_desc, offset_vmcoreinfo; | |
1113 | ||
1114 | get_note_sizes(s, s->guest_note, | |
1115 | &hsize, &name_size, &size_vmcoreinfo_desc); | |
1116 | offset_vmcoreinfo = offset_note + s->note_size - s->guest_note_size + | |
1117 | (DIV_ROUND_UP(hsize, 4) + DIV_ROUND_UP(name_size, 4)) * 4; | |
1118 | kh->offset_vmcoreinfo = cpu_to_dump64(s, offset_vmcoreinfo); | |
1119 | kh->size_vmcoreinfo = cpu_to_dump64(s, size_vmcoreinfo_desc); | |
1120 | } | |
1121 | ||
acb0ef58 BR |
1122 | kh->offset_note = cpu_to_dump64(s, offset_note); |
1123 | kh->note_size = cpu_to_dump64(s, s->note_size); | |
298f1168 QN |
1124 | |
1125 | if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS * | |
1126 | block_size, kh, size) < 0) { | |
e3517a52 | 1127 | error_setg(errp, "dump: failed to write kdump sub header"); |
298f1168 QN |
1128 | goto out; |
1129 | } | |
1130 | ||
1131 | /* write note */ | |
1132 | s->note_buf = g_malloc0(s->note_size); | |
1133 | s->note_buf_offset = 0; | |
1134 | ||
1135 | /* use s->note_buf to store notes temporarily */ | |
86a518bb JF |
1136 | write_elf64_notes(buf_write_note, s, errp); |
1137 | if (*errp) { | |
298f1168 QN |
1138 | goto out; |
1139 | } | |
1140 | ||
1141 | if (write_buffer(s->fd, offset_note, s->note_buf, | |
1142 | s->note_size) < 0) { | |
e3517a52 | 1143 | error_setg(errp, "dump: failed to write notes"); |
298f1168 QN |
1144 | goto out; |
1145 | } | |
1146 | ||
1147 | /* get offset of dump_bitmap */ | |
1148 | s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) * | |
1149 | block_size; | |
1150 | ||
1151 | /* get offset of page */ | |
1152 | s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) * | |
1153 | block_size; | |
1154 | ||
1155 | out: | |
1156 | g_free(dh); | |
1157 | g_free(kh); | |
1158 | g_free(s->note_buf); | |
298f1168 QN |
1159 | } |
1160 | ||
4c7e251a | 1161 | static void write_dump_header(DumpState *s, Error **errp) |
298f1168 | 1162 | { |
05bbaa50 | 1163 | if (dump_is_64bit(s)) { |
992861fb | 1164 | create_header64(s, errp); |
05bbaa50 JF |
1165 | } else { |
1166 | create_header32(s, errp); | |
4c7e251a | 1167 | } |
298f1168 QN |
1168 | } |
1169 | ||
8161befd AJ |
1170 | static size_t dump_bitmap_get_bufsize(DumpState *s) |
1171 | { | |
1172 | return s->dump_info.page_size; | |
1173 | } | |
1174 | ||
d0686c72 QN |
1175 | /* |
1176 | * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be | |
1177 | * rewritten, so if need to set the first bit, set last_pfn and pfn to 0. | |
1178 | * set_dump_bitmap will always leave the recently set bit un-sync. And setting | |
1179 | * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into | |
1180 | * vmcore, ie. synchronizing un-sync bit into vmcore. | |
1181 | */ | |
1182 | static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value, | |
1183 | uint8_t *buf, DumpState *s) | |
1184 | { | |
1185 | off_t old_offset, new_offset; | |
1186 | off_t offset_bitmap1, offset_bitmap2; | |
1187 | uint32_t byte, bit; | |
8161befd AJ |
1188 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); |
1189 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
d0686c72 QN |
1190 | |
1191 | /* should not set the previous place */ | |
1192 | assert(last_pfn <= pfn); | |
1193 | ||
1194 | /* | |
1195 | * if the bit needed to be set is not cached in buf, flush the data in buf | |
1196 | * to vmcore firstly. | |
1197 | * making new_offset be bigger than old_offset can also sync remained data | |
1198 | * into vmcore. | |
1199 | */ | |
8161befd AJ |
1200 | old_offset = bitmap_bufsize * (last_pfn / bits_per_buf); |
1201 | new_offset = bitmap_bufsize * (pfn / bits_per_buf); | |
d0686c72 QN |
1202 | |
1203 | while (old_offset < new_offset) { | |
1204 | /* calculate the offset and write dump_bitmap */ | |
1205 | offset_bitmap1 = s->offset_dump_bitmap + old_offset; | |
1206 | if (write_buffer(s->fd, offset_bitmap1, buf, | |
8161befd | 1207 | bitmap_bufsize) < 0) { |
d0686c72 QN |
1208 | return -1; |
1209 | } | |
1210 | ||
1211 | /* dump level 1 is chosen, so 1st and 2nd bitmap are same */ | |
1212 | offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap + | |
1213 | old_offset; | |
1214 | if (write_buffer(s->fd, offset_bitmap2, buf, | |
8161befd | 1215 | bitmap_bufsize) < 0) { |
d0686c72 QN |
1216 | return -1; |
1217 | } | |
1218 | ||
8161befd AJ |
1219 | memset(buf, 0, bitmap_bufsize); |
1220 | old_offset += bitmap_bufsize; | |
d0686c72 QN |
1221 | } |
1222 | ||
1223 | /* get the exact place of the bit in the buf, and set it */ | |
8161befd AJ |
1224 | byte = (pfn % bits_per_buf) / CHAR_BIT; |
1225 | bit = (pfn % bits_per_buf) % CHAR_BIT; | |
d0686c72 QN |
1226 | if (value) { |
1227 | buf[byte] |= 1u << bit; | |
1228 | } else { | |
1229 | buf[byte] &= ~(1u << bit); | |
1230 | } | |
1231 | ||
1232 | return 0; | |
1233 | } | |
1234 | ||
8161befd AJ |
1235 | static uint64_t dump_paddr_to_pfn(DumpState *s, uint64_t addr) |
1236 | { | |
1237 | int target_page_shift = ctz32(s->dump_info.page_size); | |
1238 | ||
1239 | return (addr >> target_page_shift) - ARCH_PFN_OFFSET; | |
1240 | } | |
1241 | ||
1242 | static uint64_t dump_pfn_to_paddr(DumpState *s, uint64_t pfn) | |
1243 | { | |
1244 | int target_page_shift = ctz32(s->dump_info.page_size); | |
1245 | ||
1246 | return (pfn + ARCH_PFN_OFFSET) << target_page_shift; | |
1247 | } | |
1248 | ||
d0686c72 | 1249 | /* |
94d78840 MAL |
1250 | * Return the page frame number and the page content in *bufptr. bufptr can be |
1251 | * NULL. If not NULL, *bufptr must contains a target page size of pre-allocated | |
1252 | * memory. This is not necessarily the memory returned. | |
d0686c72 QN |
1253 | */ |
1254 | static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr, | |
1255 | uint8_t **bufptr, DumpState *s) | |
1256 | { | |
1257 | GuestPhysBlock *block = *blockptr; | |
94d78840 MAL |
1258 | uint32_t page_size = s->dump_info.page_size; |
1259 | uint8_t *buf = NULL, *hbuf; | |
1260 | hwaddr addr; | |
d0686c72 QN |
1261 | |
1262 | /* block == NULL means the start of the iteration */ | |
1263 | if (!block) { | |
1264 | block = QTAILQ_FIRST(&s->guest_phys_blocks.head); | |
1265 | *blockptr = block; | |
08df3438 | 1266 | addr = block->target_start; |
94d78840 | 1267 | *pfnptr = dump_paddr_to_pfn(s, addr); |
08df3438 | 1268 | } else { |
94d78840 MAL |
1269 | *pfnptr += 1; |
1270 | addr = dump_pfn_to_paddr(s, *pfnptr); | |
d0686c72 | 1271 | } |
08df3438 | 1272 | assert(block != NULL); |
d0686c72 | 1273 | |
94d78840 MAL |
1274 | while (1) { |
1275 | if (addr >= block->target_start && addr < block->target_end) { | |
1276 | size_t n = MIN(block->target_end - addr, page_size - addr % page_size); | |
1277 | hbuf = block->host_addr + (addr - block->target_start); | |
1278 | if (!buf) { | |
1279 | if (n == page_size) { | |
1280 | /* this is a whole target page, go for it */ | |
1281 | assert(addr % page_size == 0); | |
1282 | buf = hbuf; | |
1283 | break; | |
1284 | } else if (bufptr) { | |
1285 | assert(*bufptr); | |
1286 | buf = *bufptr; | |
1287 | memset(buf, 0, page_size); | |
1288 | } else { | |
1289 | return true; | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | memcpy(buf + addr % page_size, hbuf, n); | |
1294 | addr += n; | |
1295 | if (addr % page_size == 0) { | |
1296 | /* we filled up the page */ | |
1297 | break; | |
1298 | } | |
1299 | } else { | |
1300 | /* the next page is in the next block */ | |
1301 | *blockptr = block = QTAILQ_NEXT(block, next); | |
1302 | if (!block) { | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | addr = block->target_start; | |
1307 | /* are we still in the same page? */ | |
1308 | if (dump_paddr_to_pfn(s, addr) != *pfnptr) { | |
1309 | if (buf) { | |
1310 | /* no, but we already filled something earlier, return it */ | |
1311 | break; | |
1312 | } else { | |
1313 | /* else continue from there */ | |
1314 | *pfnptr = dump_paddr_to_pfn(s, addr); | |
1315 | } | |
1316 | } | |
d0686c72 | 1317 | } |
d0686c72 QN |
1318 | } |
1319 | ||
1320 | if (bufptr) { | |
1321 | *bufptr = buf; | |
1322 | } | |
1323 | ||
94d78840 | 1324 | return buf != NULL; |
d0686c72 QN |
1325 | } |
1326 | ||
4c7e251a | 1327 | static void write_dump_bitmap(DumpState *s, Error **errp) |
d0686c72 QN |
1328 | { |
1329 | int ret = 0; | |
1330 | uint64_t last_pfn, pfn; | |
1331 | void *dump_bitmap_buf; | |
1332 | size_t num_dumpable; | |
1333 | GuestPhysBlock *block_iter = NULL; | |
8161befd AJ |
1334 | size_t bitmap_bufsize = dump_bitmap_get_bufsize(s); |
1335 | size_t bits_per_buf = bitmap_bufsize * CHAR_BIT; | |
d0686c72 QN |
1336 | |
1337 | /* dump_bitmap_buf is used to store dump_bitmap temporarily */ | |
8161befd | 1338 | dump_bitmap_buf = g_malloc0(bitmap_bufsize); |
d0686c72 QN |
1339 | |
1340 | num_dumpable = 0; | |
1341 | last_pfn = 0; | |
1342 | ||
1343 | /* | |
1344 | * exam memory page by page, and set the bit in dump_bitmap corresponded | |
1345 | * to the existing page. | |
1346 | */ | |
1347 | while (get_next_page(&block_iter, &pfn, NULL, s)) { | |
1348 | ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s); | |
1349 | if (ret < 0) { | |
e3517a52 | 1350 | error_setg(errp, "dump: failed to set dump_bitmap"); |
d0686c72 QN |
1351 | goto out; |
1352 | } | |
1353 | ||
1354 | last_pfn = pfn; | |
1355 | num_dumpable++; | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * set_dump_bitmap will always leave the recently set bit un-sync. Here we | |
8161befd AJ |
1360 | * set the remaining bits from last_pfn to the end of the bitmap buffer to |
1361 | * 0. With those set, the un-sync bit will be synchronized into the vmcore. | |
d0686c72 QN |
1362 | */ |
1363 | if (num_dumpable > 0) { | |
8161befd | 1364 | ret = set_dump_bitmap(last_pfn, last_pfn + bits_per_buf, false, |
d0686c72 QN |
1365 | dump_bitmap_buf, s); |
1366 | if (ret < 0) { | |
e3517a52 | 1367 | error_setg(errp, "dump: failed to sync dump_bitmap"); |
d0686c72 QN |
1368 | goto out; |
1369 | } | |
1370 | } | |
1371 | ||
1372 | /* number of dumpable pages that will be dumped later */ | |
1373 | s->num_dumpable = num_dumpable; | |
1374 | ||
1375 | out: | |
1376 | g_free(dump_bitmap_buf); | |
d0686c72 QN |
1377 | } |
1378 | ||
64cfba6a QN |
1379 | static void prepare_data_cache(DataCache *data_cache, DumpState *s, |
1380 | off_t offset) | |
1381 | { | |
1382 | data_cache->fd = s->fd; | |
1383 | data_cache->data_size = 0; | |
8161befd AJ |
1384 | data_cache->buf_size = 4 * dump_bitmap_get_bufsize(s); |
1385 | data_cache->buf = g_malloc0(data_cache->buf_size); | |
64cfba6a QN |
1386 | data_cache->offset = offset; |
1387 | } | |
1388 | ||
1389 | static int write_cache(DataCache *dc, const void *buf, size_t size, | |
1390 | bool flag_sync) | |
1391 | { | |
1392 | /* | |
1393 | * dc->buf_size should not be less than size, otherwise dc will never be | |
1394 | * enough | |
1395 | */ | |
1396 | assert(size <= dc->buf_size); | |
1397 | ||
1398 | /* | |
1399 | * if flag_sync is set, synchronize data in dc->buf into vmcore. | |
1400 | * otherwise check if the space is enough for caching data in buf, if not, | |
1401 | * write the data in dc->buf to dc->fd and reset dc->buf | |
1402 | */ | |
1403 | if ((!flag_sync && dc->data_size + size > dc->buf_size) || | |
1404 | (flag_sync && dc->data_size > 0)) { | |
1405 | if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) { | |
1406 | return -1; | |
1407 | } | |
1408 | ||
1409 | dc->offset += dc->data_size; | |
1410 | dc->data_size = 0; | |
1411 | } | |
1412 | ||
1413 | if (!flag_sync) { | |
1414 | memcpy(dc->buf + dc->data_size, buf, size); | |
1415 | dc->data_size += size; | |
1416 | } | |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | static void free_data_cache(DataCache *data_cache) | |
1422 | { | |
1423 | g_free(data_cache->buf); | |
1424 | } | |
1425 | ||
d12f57ec QN |
1426 | static size_t get_len_buf_out(size_t page_size, uint32_t flag_compress) |
1427 | { | |
b87ef351 LE |
1428 | switch (flag_compress) { |
1429 | case DUMP_DH_COMPRESSED_ZLIB: | |
1430 | return compressBound(page_size); | |
1431 | ||
1432 | case DUMP_DH_COMPRESSED_LZO: | |
1433 | /* | |
1434 | * LZO will expand incompressible data by a little amount. Please check | |
1435 | * the following URL to see the expansion calculation: | |
1436 | * http://www.oberhumer.com/opensource/lzo/lzofaq.php | |
1437 | */ | |
1438 | return page_size + page_size / 16 + 64 + 3; | |
d12f57ec QN |
1439 | |
1440 | #ifdef CONFIG_SNAPPY | |
b87ef351 LE |
1441 | case DUMP_DH_COMPRESSED_SNAPPY: |
1442 | return snappy_max_compressed_length(page_size); | |
d12f57ec | 1443 | #endif |
b87ef351 LE |
1444 | } |
1445 | return 0; | |
d12f57ec QN |
1446 | } |
1447 | ||
4c7e251a | 1448 | static void write_dump_pages(DumpState *s, Error **errp) |
d12f57ec QN |
1449 | { |
1450 | int ret = 0; | |
1451 | DataCache page_desc, page_data; | |
1452 | size_t len_buf_out, size_out; | |
1453 | #ifdef CONFIG_LZO | |
1454 | lzo_bytep wrkmem = NULL; | |
1455 | #endif | |
1456 | uint8_t *buf_out = NULL; | |
1457 | off_t offset_desc, offset_data; | |
1458 | PageDescriptor pd, pd_zero; | |
1459 | uint8_t *buf; | |
d12f57ec QN |
1460 | GuestPhysBlock *block_iter = NULL; |
1461 | uint64_t pfn_iter; | |
94d78840 | 1462 | g_autofree uint8_t *page = NULL; |
d12f57ec QN |
1463 | |
1464 | /* get offset of page_desc and page_data in dump file */ | |
1465 | offset_desc = s->offset_page; | |
1466 | offset_data = offset_desc + sizeof(PageDescriptor) * s->num_dumpable; | |
1467 | ||
1468 | prepare_data_cache(&page_desc, s, offset_desc); | |
1469 | prepare_data_cache(&page_data, s, offset_data); | |
1470 | ||
1471 | /* prepare buffer to store compressed data */ | |
8161befd | 1472 | len_buf_out = get_len_buf_out(s->dump_info.page_size, s->flag_compress); |
b87ef351 | 1473 | assert(len_buf_out != 0); |
d12f57ec QN |
1474 | |
1475 | #ifdef CONFIG_LZO | |
1476 | wrkmem = g_malloc(LZO1X_1_MEM_COMPRESS); | |
1477 | #endif | |
1478 | ||
1479 | buf_out = g_malloc(len_buf_out); | |
1480 | ||
1481 | /* | |
1482 | * init zero page's page_desc and page_data, because every zero page | |
1483 | * uses the same page_data | |
1484 | */ | |
8161befd | 1485 | pd_zero.size = cpu_to_dump32(s, s->dump_info.page_size); |
acb0ef58 BR |
1486 | pd_zero.flags = cpu_to_dump32(s, 0); |
1487 | pd_zero.offset = cpu_to_dump64(s, offset_data); | |
1488 | pd_zero.page_flags = cpu_to_dump64(s, 0); | |
8161befd AJ |
1489 | buf = g_malloc0(s->dump_info.page_size); |
1490 | ret = write_cache(&page_data, buf, s->dump_info.page_size, false); | |
d12f57ec QN |
1491 | g_free(buf); |
1492 | if (ret < 0) { | |
e3517a52 | 1493 | error_setg(errp, "dump: failed to write page data (zero page)"); |
d12f57ec QN |
1494 | goto out; |
1495 | } | |
1496 | ||
8161befd | 1497 | offset_data += s->dump_info.page_size; |
94d78840 | 1498 | page = g_malloc(s->dump_info.page_size); |
d12f57ec QN |
1499 | |
1500 | /* | |
1501 | * dump memory to vmcore page by page. zero page will all be resided in the | |
1502 | * first page of page section | |
1503 | */ | |
94d78840 | 1504 | for (buf = page; get_next_page(&block_iter, &pfn_iter, &buf, s); buf = page) { |
d12f57ec | 1505 | /* check zero page */ |
f13f22ba | 1506 | if (buffer_is_zero(buf, s->dump_info.page_size)) { |
d12f57ec QN |
1507 | ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor), |
1508 | false); | |
1509 | if (ret < 0) { | |
e3517a52 | 1510 | error_setg(errp, "dump: failed to write page desc"); |
d12f57ec QN |
1511 | goto out; |
1512 | } | |
1513 | } else { | |
1514 | /* | |
1515 | * not zero page, then: | |
1516 | * 1. compress the page | |
1517 | * 2. write the compressed page into the cache of page_data | |
1518 | * 3. get page desc of the compressed page and write it into the | |
1519 | * cache of page_desc | |
1520 | * | |
1521 | * only one compression format will be used here, for | |
1522 | * s->flag_compress is set. But when compression fails to work, | |
1523 | * we fall back to save in plaintext. | |
1524 | */ | |
1525 | size_out = len_buf_out; | |
1526 | if ((s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) && | |
acb0ef58 | 1527 | (compress2(buf_out, (uLongf *)&size_out, buf, |
8161befd AJ |
1528 | s->dump_info.page_size, Z_BEST_SPEED) == Z_OK) && |
1529 | (size_out < s->dump_info.page_size)) { | |
acb0ef58 BR |
1530 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_ZLIB); |
1531 | pd.size = cpu_to_dump32(s, size_out); | |
d12f57ec QN |
1532 | |
1533 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1534 | if (ret < 0) { | |
e3517a52 | 1535 | error_setg(errp, "dump: failed to write page data"); |
d12f57ec QN |
1536 | goto out; |
1537 | } | |
1538 | #ifdef CONFIG_LZO | |
1539 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_LZO) && | |
8161befd | 1540 | (lzo1x_1_compress(buf, s->dump_info.page_size, buf_out, |
d12f57ec | 1541 | (lzo_uint *)&size_out, wrkmem) == LZO_E_OK) && |
8161befd | 1542 | (size_out < s->dump_info.page_size)) { |
acb0ef58 BR |
1543 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_LZO); |
1544 | pd.size = cpu_to_dump32(s, size_out); | |
d12f57ec QN |
1545 | |
1546 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1547 | if (ret < 0) { | |
e3517a52 | 1548 | error_setg(errp, "dump: failed to write page data"); |
d12f57ec QN |
1549 | goto out; |
1550 | } | |
1551 | #endif | |
1552 | #ifdef CONFIG_SNAPPY | |
1553 | } else if ((s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) && | |
8161befd | 1554 | (snappy_compress((char *)buf, s->dump_info.page_size, |
d12f57ec | 1555 | (char *)buf_out, &size_out) == SNAPPY_OK) && |
8161befd | 1556 | (size_out < s->dump_info.page_size)) { |
acb0ef58 BR |
1557 | pd.flags = cpu_to_dump32(s, DUMP_DH_COMPRESSED_SNAPPY); |
1558 | pd.size = cpu_to_dump32(s, size_out); | |
d12f57ec QN |
1559 | |
1560 | ret = write_cache(&page_data, buf_out, size_out, false); | |
1561 | if (ret < 0) { | |
e3517a52 | 1562 | error_setg(errp, "dump: failed to write page data"); |
d12f57ec QN |
1563 | goto out; |
1564 | } | |
1565 | #endif | |
1566 | } else { | |
1567 | /* | |
1568 | * fall back to save in plaintext, size_out should be | |
8161befd | 1569 | * assigned the target's page size |
d12f57ec | 1570 | */ |
acb0ef58 | 1571 | pd.flags = cpu_to_dump32(s, 0); |
8161befd | 1572 | size_out = s->dump_info.page_size; |
acb0ef58 | 1573 | pd.size = cpu_to_dump32(s, size_out); |
d12f57ec | 1574 | |
8161befd AJ |
1575 | ret = write_cache(&page_data, buf, |
1576 | s->dump_info.page_size, false); | |
d12f57ec | 1577 | if (ret < 0) { |
e3517a52 | 1578 | error_setg(errp, "dump: failed to write page data"); |
d12f57ec QN |
1579 | goto out; |
1580 | } | |
1581 | } | |
1582 | ||
1583 | /* get and write page desc here */ | |
acb0ef58 BR |
1584 | pd.page_flags = cpu_to_dump64(s, 0); |
1585 | pd.offset = cpu_to_dump64(s, offset_data); | |
d12f57ec QN |
1586 | offset_data += size_out; |
1587 | ||
1588 | ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false); | |
1589 | if (ret < 0) { | |
e3517a52 | 1590 | error_setg(errp, "dump: failed to write page desc"); |
d12f57ec QN |
1591 | goto out; |
1592 | } | |
1593 | } | |
2264c2c9 | 1594 | s->written_size += s->dump_info.page_size; |
d12f57ec QN |
1595 | } |
1596 | ||
1597 | ret = write_cache(&page_desc, NULL, 0, true); | |
1598 | if (ret < 0) { | |
e3517a52 | 1599 | error_setg(errp, "dump: failed to sync cache for page_desc"); |
d12f57ec QN |
1600 | goto out; |
1601 | } | |
1602 | ret = write_cache(&page_data, NULL, 0, true); | |
1603 | if (ret < 0) { | |
e3517a52 | 1604 | error_setg(errp, "dump: failed to sync cache for page_data"); |
d12f57ec QN |
1605 | goto out; |
1606 | } | |
1607 | ||
1608 | out: | |
1609 | free_data_cache(&page_desc); | |
1610 | free_data_cache(&page_data); | |
1611 | ||
1612 | #ifdef CONFIG_LZO | |
1613 | g_free(wrkmem); | |
1614 | #endif | |
1615 | ||
1616 | g_free(buf_out); | |
d12f57ec QN |
1617 | } |
1618 | ||
4c7e251a | 1619 | static void create_kdump_vmcore(DumpState *s, Error **errp) |
b53ccc30 | 1620 | { |
86a518bb | 1621 | ERRP_GUARD(); |
b53ccc30 QN |
1622 | int ret; |
1623 | ||
1624 | /* | |
1625 | * the kdump-compressed format is: | |
1626 | * File offset | |
1627 | * +------------------------------------------+ 0x0 | |
1628 | * | main header (struct disk_dump_header) | | |
1629 | * |------------------------------------------+ block 1 | |
1630 | * | sub header (struct kdump_sub_header) | | |
1631 | * |------------------------------------------+ block 2 | |
1632 | * | 1st-dump_bitmap | | |
1633 | * |------------------------------------------+ block 2 + X blocks | |
1634 | * | 2nd-dump_bitmap | (aligned by block) | |
1635 | * |------------------------------------------+ block 2 + 2 * X blocks | |
1636 | * | page desc for pfn 0 (struct page_desc) | (aligned by block) | |
1637 | * | page desc for pfn 1 (struct page_desc) | | |
1638 | * | : | | |
1639 | * |------------------------------------------| (not aligned by block) | |
1640 | * | page data (pfn 0) | | |
1641 | * | page data (pfn 1) | | |
1642 | * | : | | |
1643 | * +------------------------------------------+ | |
1644 | */ | |
1645 | ||
1646 | ret = write_start_flat_header(s->fd); | |
1647 | if (ret < 0) { | |
e3517a52 | 1648 | error_setg(errp, "dump: failed to write start flat header"); |
4c7e251a | 1649 | return; |
b53ccc30 QN |
1650 | } |
1651 | ||
86a518bb JF |
1652 | write_dump_header(s, errp); |
1653 | if (*errp) { | |
4c7e251a | 1654 | return; |
b53ccc30 QN |
1655 | } |
1656 | ||
86a518bb JF |
1657 | write_dump_bitmap(s, errp); |
1658 | if (*errp) { | |
4c7e251a | 1659 | return; |
b53ccc30 QN |
1660 | } |
1661 | ||
86a518bb JF |
1662 | write_dump_pages(s, errp); |
1663 | if (*errp) { | |
4c7e251a | 1664 | return; |
b53ccc30 QN |
1665 | } |
1666 | ||
1667 | ret = write_end_flat_header(s->fd); | |
1668 | if (ret < 0) { | |
e3517a52 | 1669 | error_setg(errp, "dump: failed to write end flat header"); |
4c7e251a | 1670 | return; |
b53ccc30 | 1671 | } |
b53ccc30 QN |
1672 | } |
1673 | ||
0c2994ac | 1674 | static int validate_start_block(DumpState *s) |
783e9b48 | 1675 | { |
56c4bfb3 | 1676 | GuestPhysBlock *block; |
783e9b48 | 1677 | |
dddf725f | 1678 | if (!dump_has_filter(s)) { |
783e9b48 WC |
1679 | return 0; |
1680 | } | |
1681 | ||
56c4bfb3 | 1682 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { |
0c2994ac | 1683 | /* This block is out of the range */ |
dddf725f JF |
1684 | if (block->target_start >= s->filter_area_begin + s->filter_area_length || |
1685 | block->target_end <= s->filter_area_begin) { | |
783e9b48 WC |
1686 | continue; |
1687 | } | |
0c2994ac JF |
1688 | return 0; |
1689 | } | |
783e9b48 WC |
1690 | |
1691 | return -1; | |
1692 | } | |
1693 | ||
7aad248d QN |
1694 | static void get_max_mapnr(DumpState *s) |
1695 | { | |
1696 | GuestPhysBlock *last_block; | |
1697 | ||
eae3eb3e | 1698 | last_block = QTAILQ_LAST(&s->guest_phys_blocks.head); |
8161befd | 1699 | s->max_mapnr = dump_paddr_to_pfn(s, last_block->target_end); |
7aad248d QN |
1700 | } |
1701 | ||
baf28f57 PX |
1702 | static DumpState dump_state_global = { .status = DUMP_STATUS_NONE }; |
1703 | ||
1704 | static void dump_state_prepare(DumpState *s) | |
1705 | { | |
1706 | /* zero the struct, setting status to active */ | |
1707 | *s = (DumpState) { .status = DUMP_STATUS_ACTIVE }; | |
1708 | } | |
1709 | ||
544803c7 | 1710 | bool qemu_system_dump_in_progress(void) |
65d64f36 PX |
1711 | { |
1712 | DumpState *state = &dump_state_global; | |
d73415a3 | 1713 | return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE); |
65d64f36 PX |
1714 | } |
1715 | ||
c370d530 JF |
1716 | /* |
1717 | * calculate total size of memory to be dumped (taking filter into | |
1718 | * account.) | |
1719 | */ | |
2264c2c9 PX |
1720 | static int64_t dump_calculate_size(DumpState *s) |
1721 | { | |
1722 | GuestPhysBlock *block; | |
c370d530 | 1723 | int64_t total = 0; |
2264c2c9 PX |
1724 | |
1725 | QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) { | |
c370d530 JF |
1726 | total += dump_filtered_memblock_size(block, |
1727 | s->filter_area_begin, | |
1728 | s->filter_area_length); | |
2264c2c9 PX |
1729 | } |
1730 | ||
1731 | return total; | |
1732 | } | |
1733 | ||
d9feb517 MAL |
1734 | static void vmcoreinfo_update_phys_base(DumpState *s) |
1735 | { | |
1736 | uint64_t size, note_head_size, name_size, phys_base; | |
1737 | char **lines; | |
1738 | uint8_t *vmci; | |
1739 | size_t i; | |
1740 | ||
1741 | if (!note_name_equal(s, s->guest_note, "VMCOREINFO")) { | |
1742 | return; | |
1743 | } | |
1744 | ||
1745 | get_note_sizes(s, s->guest_note, ¬e_head_size, &name_size, &size); | |
1746 | note_head_size = ROUND_UP(note_head_size, 4); | |
1747 | ||
1748 | vmci = s->guest_note + note_head_size + ROUND_UP(name_size, 4); | |
1749 | *(vmci + size) = '\0'; | |
1750 | ||
1751 | lines = g_strsplit((char *)vmci, "\n", -1); | |
1752 | for (i = 0; lines[i]; i++) { | |
68cbecfd WH |
1753 | const char *prefix = NULL; |
1754 | ||
1755 | if (s->dump_info.d_machine == EM_X86_64) { | |
1756 | prefix = "NUMBER(phys_base)="; | |
1757 | } else if (s->dump_info.d_machine == EM_AARCH64) { | |
1758 | prefix = "NUMBER(PHYS_OFFSET)="; | |
1759 | } | |
1760 | ||
1761 | if (prefix && g_str_has_prefix(lines[i], prefix)) { | |
1762 | if (qemu_strtou64(lines[i] + strlen(prefix), NULL, 16, | |
d9feb517 | 1763 | &phys_base) < 0) { |
68cbecfd | 1764 | warn_report("Failed to read %s", prefix); |
d9feb517 MAL |
1765 | } else { |
1766 | s->dump_info.phys_base = phys_base; | |
1767 | } | |
1768 | break; | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | g_strfreev(lines); | |
1773 | } | |
1774 | ||
4c7e251a HZ |
1775 | static void dump_init(DumpState *s, int fd, bool has_format, |
1776 | DumpGuestMemoryFormat format, bool paging, bool has_filter, | |
1777 | int64_t begin, int64_t length, Error **errp) | |
783e9b48 | 1778 | { |
86a518bb | 1779 | ERRP_GUARD(); |
903ef734 | 1780 | VMCoreInfoState *vmci = vmcoreinfo_find(); |
182735ef | 1781 | CPUState *cpu; |
783e9b48 WC |
1782 | int nr_cpus; |
1783 | int ret; | |
1784 | ||
ca1fc8c9 PX |
1785 | s->has_format = has_format; |
1786 | s->format = format; | |
2264c2c9 | 1787 | s->written_size = 0; |
ca1fc8c9 | 1788 | |
b53ccc30 QN |
1789 | /* kdump-compressed is conflict with paging and filter */ |
1790 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1791 | assert(!paging && !has_filter); | |
1792 | } | |
1793 | ||
783e9b48 WC |
1794 | if (runstate_is_running()) { |
1795 | vm_stop(RUN_STATE_SAVE_VM); | |
1796 | s->resume = true; | |
1797 | } else { | |
1798 | s->resume = false; | |
1799 | } | |
1800 | ||
5ee163e8 LE |
1801 | /* If we use KVM, we should synchronize the registers before we get dump |
1802 | * info or physmap info. | |
1803 | */ | |
1804 | cpu_synchronize_all_states(); | |
1805 | nr_cpus = 0; | |
bdc44640 | 1806 | CPU_FOREACH(cpu) { |
5ee163e8 LE |
1807 | nr_cpus++; |
1808 | } | |
1809 | ||
783e9b48 | 1810 | s->fd = fd; |
dddf725f JF |
1811 | if (has_filter && !length) { |
1812 | error_setg(errp, QERR_INVALID_PARAMETER, "length"); | |
1813 | goto cleanup; | |
1814 | } | |
1815 | s->filter_area_begin = begin; | |
1816 | s->filter_area_length = length; | |
5ee163e8 | 1817 | |
9b72224f JF |
1818 | /* First index is 0, it's the special null name */ |
1819 | s->string_table_buf = g_array_new(FALSE, TRUE, 1); | |
1820 | /* | |
1821 | * Allocate the null name, due to the clearing option set to true | |
1822 | * it will be 0. | |
1823 | */ | |
1824 | g_array_set_size(s->string_table_buf, 1); | |
1825 | ||
2928207a CG |
1826 | memory_mapping_list_init(&s->list); |
1827 | ||
5ee163e8 | 1828 | guest_phys_blocks_init(&s->guest_phys_blocks); |
c5d7f60f | 1829 | guest_phys_blocks_append(&s->guest_phys_blocks); |
2264c2c9 PX |
1830 | s->total_size = dump_calculate_size(s); |
1831 | #ifdef DEBUG_DUMP_GUEST_MEMORY | |
1832 | fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size); | |
1833 | #endif | |
5ee163e8 | 1834 | |
d1e6994a CH |
1835 | /* it does not make sense to dump non-existent memory */ |
1836 | if (!s->total_size) { | |
1837 | error_setg(errp, "dump: no guest memory to dump"); | |
1838 | goto cleanup; | |
1839 | } | |
1840 | ||
0c2994ac JF |
1841 | /* Is the filter filtering everything? */ |
1842 | if (validate_start_block(s) == -1) { | |
c6bd8c70 | 1843 | error_setg(errp, QERR_INVALID_PARAMETER, "begin"); |
783e9b48 WC |
1844 | goto cleanup; |
1845 | } | |
1846 | ||
5ee163e8 | 1847 | /* get dump info: endian, class and architecture. |
783e9b48 WC |
1848 | * If the target architecture is not supported, cpu_get_dump_info() will |
1849 | * return -1. | |
783e9b48 | 1850 | */ |
56c4bfb3 | 1851 | ret = cpu_get_dump_info(&s->dump_info, &s->guest_phys_blocks); |
783e9b48 | 1852 | if (ret < 0) { |
f969c627 MA |
1853 | error_setg(errp, |
1854 | "dumping guest memory is not supported on this target"); | |
783e9b48 WC |
1855 | goto cleanup; |
1856 | } | |
1857 | ||
8161befd | 1858 | if (!s->dump_info.page_size) { |
c5d40b22 | 1859 | s->dump_info.page_size = qemu_target_page_size(); |
8161befd AJ |
1860 | } |
1861 | ||
4720bd05 PB |
1862 | s->note_size = cpu_get_note_size(s->dump_info.d_class, |
1863 | s->dump_info.d_machine, nr_cpus); | |
f1a4697c | 1864 | assert(s->note_size >= 0); |
4720bd05 | 1865 | |
903ef734 | 1866 | /* |
d9feb517 MAL |
1867 | * The goal of this block is to (a) update the previously guessed |
1868 | * phys_base, (b) copy the guest note out of the guest. | |
1869 | * Failure to do so is not fatal for dumping. | |
903ef734 MAL |
1870 | */ |
1871 | if (vmci) { | |
1872 | uint64_t addr, note_head_size, name_size, desc_size; | |
1873 | uint32_t size; | |
1874 | uint16_t format; | |
1875 | ||
05bbaa50 JF |
1876 | note_head_size = dump_is_64bit(s) ? |
1877 | sizeof(Elf64_Nhdr) : sizeof(Elf32_Nhdr); | |
903ef734 MAL |
1878 | |
1879 | format = le16_to_cpu(vmci->vmcoreinfo.guest_format); | |
1880 | size = le32_to_cpu(vmci->vmcoreinfo.size); | |
1881 | addr = le64_to_cpu(vmci->vmcoreinfo.paddr); | |
1882 | if (!vmci->has_vmcoreinfo) { | |
1883 | warn_report("guest note is not present"); | |
1884 | } else if (size < note_head_size || size > MAX_GUEST_NOTE_SIZE) { | |
1885 | warn_report("guest note size is invalid: %" PRIu32, size); | |
5be5df72 | 1886 | } else if (format != FW_CFG_VMCOREINFO_FORMAT_ELF) { |
903ef734 MAL |
1887 | warn_report("guest note format is unsupported: %" PRIu16, format); |
1888 | } else { | |
1889 | s->guest_note = g_malloc(size + 1); /* +1 for adding \0 */ | |
1890 | cpu_physical_memory_read(addr, s->guest_note, size); | |
1891 | ||
1892 | get_note_sizes(s, s->guest_note, NULL, &name_size, &desc_size); | |
1893 | s->guest_note_size = ELF_NOTE_SIZE(note_head_size, name_size, | |
1894 | desc_size); | |
1895 | if (name_size > MAX_GUEST_NOTE_SIZE || | |
1896 | desc_size > MAX_GUEST_NOTE_SIZE || | |
1897 | s->guest_note_size > size) { | |
1898 | warn_report("Invalid guest note header"); | |
1899 | g_free(s->guest_note); | |
1900 | s->guest_note = NULL; | |
1901 | } else { | |
d9feb517 | 1902 | vmcoreinfo_update_phys_base(s); |
903ef734 MAL |
1903 | s->note_size += s->guest_note_size; |
1904 | } | |
1905 | } | |
1906 | } | |
1907 | ||
783e9b48 | 1908 | /* get memory mapping */ |
783e9b48 | 1909 | if (paging) { |
86a518bb JF |
1910 | qemu_get_guest_memory_mapping(&s->list, &s->guest_phys_blocks, errp); |
1911 | if (*errp) { | |
11ed09cf AF |
1912 | goto cleanup; |
1913 | } | |
783e9b48 | 1914 | } else { |
56c4bfb3 | 1915 | qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks); |
783e9b48 WC |
1916 | } |
1917 | ||
7aad248d | 1918 | s->nr_cpus = nr_cpus; |
7aad248d QN |
1919 | |
1920 | get_max_mapnr(s); | |
1921 | ||
1922 | uint64_t tmp; | |
8161befd AJ |
1923 | tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), |
1924 | s->dump_info.page_size); | |
1925 | s->len_dump_bitmap = tmp * s->dump_info.page_size; | |
7aad248d | 1926 | |
b53ccc30 QN |
1927 | /* init for kdump-compressed format */ |
1928 | if (has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
1929 | switch (format) { | |
1930 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB: | |
1931 | s->flag_compress = DUMP_DH_COMPRESSED_ZLIB; | |
1932 | break; | |
1933 | ||
1934 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO: | |
c998acb0 LE |
1935 | #ifdef CONFIG_LZO |
1936 | if (lzo_init() != LZO_E_OK) { | |
1937 | error_setg(errp, "failed to initialize the LZO library"); | |
1938 | goto cleanup; | |
1939 | } | |
1940 | #endif | |
b53ccc30 QN |
1941 | s->flag_compress = DUMP_DH_COMPRESSED_LZO; |
1942 | break; | |
1943 | ||
1944 | case DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY: | |
1945 | s->flag_compress = DUMP_DH_COMPRESSED_SNAPPY; | |
1946 | break; | |
1947 | ||
1948 | default: | |
1949 | s->flag_compress = 0; | |
1950 | } | |
1951 | ||
4c7e251a | 1952 | return; |
b53ccc30 QN |
1953 | } |
1954 | ||
dddf725f JF |
1955 | if (dump_has_filter(s)) { |
1956 | memory_mapping_filter(&s->list, s->filter_area_begin, s->filter_area_length); | |
783e9b48 WC |
1957 | } |
1958 | ||
1959 | /* | |
9b72224f JF |
1960 | * The first section header is always a special one in which most |
1961 | * fields are 0. The section header string table is also always | |
1962 | * set. | |
1963 | */ | |
1964 | s->shdr_num = 2; | |
1965 | ||
1966 | /* | |
1967 | * Adds the number of architecture sections to shdr_num and sets | |
1968 | * elf_section_data_size so we know the offsets and sizes of all | |
1969 | * parts. | |
1970 | */ | |
1971 | if (s->dump_info.arch_sections_add_fn) { | |
1972 | s->dump_info.arch_sections_add_fn(s); | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * calculate shdr_num so we know the offsets and sizes of all | |
1977 | * parts. | |
1978 | * Calculate phdr_num | |
783e9b48 | 1979 | * |
9b72224f JF |
1980 | * The absolute maximum amount of phdrs is UINT32_MAX - 1 as |
1981 | * sh_info is 32 bit. There's special handling once we go over | |
1982 | * UINT16_MAX - 1 but that is handled in the ehdr and section | |
1983 | * code. | |
783e9b48 | 1984 | */ |
9b72224f JF |
1985 | s->phdr_num = 1; /* Reserve PT_NOTE */ |
1986 | if (s->list.num <= UINT32_MAX - 1) { | |
783e9b48 | 1987 | s->phdr_num += s->list.num; |
783e9b48 | 1988 | } else { |
9b72224f | 1989 | s->phdr_num = UINT32_MAX; |
783e9b48 WC |
1990 | } |
1991 | ||
9b72224f JF |
1992 | /* |
1993 | * Now that the number of section and program headers is known we | |
1994 | * can calculate the offsets of the headers and data. | |
1995 | */ | |
05bbaa50 | 1996 | if (dump_is_64bit(s)) { |
cb415fd6 JF |
1997 | s->shdr_offset = sizeof(Elf64_Ehdr); |
1998 | s->phdr_offset = s->shdr_offset + sizeof(Elf64_Shdr) * s->shdr_num; | |
1999 | s->note_offset = s->phdr_offset + sizeof(Elf64_Phdr) * s->phdr_num; | |
783e9b48 | 2000 | } else { |
cb415fd6 JF |
2001 | s->shdr_offset = sizeof(Elf32_Ehdr); |
2002 | s->phdr_offset = s->shdr_offset + sizeof(Elf32_Shdr) * s->shdr_num; | |
2003 | s->note_offset = s->phdr_offset + sizeof(Elf32_Phdr) * s->phdr_num; | |
783e9b48 | 2004 | } |
13fd417d JF |
2005 | s->memory_offset = s->note_offset + s->note_size; |
2006 | s->section_offset = s->memory_offset + s->total_size; | |
783e9b48 | 2007 | |
4c7e251a | 2008 | return; |
783e9b48 WC |
2009 | |
2010 | cleanup: | |
2928207a | 2011 | dump_cleanup(s); |
783e9b48 WC |
2012 | } |
2013 | ||
ca1fc8c9 PX |
2014 | /* this operation might be time consuming. */ |
2015 | static void dump_process(DumpState *s, Error **errp) | |
2016 | { | |
86a518bb | 2017 | ERRP_GUARD(); |
d42a0d14 | 2018 | DumpQueryResult *result = NULL; |
ca1fc8c9 | 2019 | |
2da91b54 VP |
2020 | if (s->has_format && s->format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP) { |
2021 | #ifdef TARGET_X86_64 | |
86a518bb | 2022 | create_win_dump(s, errp); |
2da91b54 VP |
2023 | #endif |
2024 | } else if (s->has_format && s->format != DUMP_GUEST_MEMORY_FORMAT_ELF) { | |
86a518bb | 2025 | create_kdump_vmcore(s, errp); |
ca1fc8c9 | 2026 | } else { |
86a518bb | 2027 | create_vmcore(s, errp); |
ca1fc8c9 PX |
2028 | } |
2029 | ||
39ba2ea6 PX |
2030 | /* make sure status is written after written_size updates */ |
2031 | smp_wmb(); | |
d73415a3 | 2032 | qatomic_set(&s->status, |
86a518bb | 2033 | (*errp ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); |
ca1fc8c9 | 2034 | |
d42a0d14 PX |
2035 | /* send DUMP_COMPLETED message (unconditionally) */ |
2036 | result = qmp_query_dump(NULL); | |
2037 | /* should never fail */ | |
2038 | assert(result); | |
d4f8bdc7 MA |
2039 | qapi_event_send_dump_completed(result, |
2040 | *errp ? error_get_pretty(*errp) : NULL); | |
d42a0d14 PX |
2041 | qapi_free_DumpQueryResult(result); |
2042 | ||
ca1fc8c9 PX |
2043 | dump_cleanup(s); |
2044 | } | |
2045 | ||
1fbeff72 PX |
2046 | static void *dump_thread(void *data) |
2047 | { | |
1fbeff72 | 2048 | DumpState *s = (DumpState *)data; |
c3a8fe33 | 2049 | dump_process(s, NULL); |
1fbeff72 PX |
2050 | return NULL; |
2051 | } | |
2052 | ||
39ba2ea6 PX |
2053 | DumpQueryResult *qmp_query_dump(Error **errp) |
2054 | { | |
2055 | DumpQueryResult *result = g_new(DumpQueryResult, 1); | |
2056 | DumpState *state = &dump_state_global; | |
d73415a3 | 2057 | result->status = qatomic_read(&state->status); |
39ba2ea6 PX |
2058 | /* make sure we are reading status and written_size in order */ |
2059 | smp_rmb(); | |
2060 | result->completed = state->written_size; | |
2061 | result->total = state->total_size; | |
2062 | return result; | |
2063 | } | |
2064 | ||
228de9cf PX |
2065 | void qmp_dump_guest_memory(bool paging, const char *file, |
2066 | bool has_detach, bool detach, | |
2067 | bool has_begin, int64_t begin, bool has_length, | |
b53ccc30 QN |
2068 | int64_t length, bool has_format, |
2069 | DumpGuestMemoryFormat format, Error **errp) | |
783e9b48 | 2070 | { |
86a518bb | 2071 | ERRP_GUARD(); |
783e9b48 WC |
2072 | const char *p; |
2073 | int fd = -1; | |
2074 | DumpState *s; | |
1fbeff72 | 2075 | bool detach_p = false; |
783e9b48 | 2076 | |
63e27f28 PX |
2077 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
2078 | error_setg(errp, "Dump not allowed during incoming migration."); | |
2079 | return; | |
2080 | } | |
2081 | ||
65d64f36 PX |
2082 | /* if there is a dump in background, we should wait until the dump |
2083 | * finished */ | |
544803c7 | 2084 | if (qemu_system_dump_in_progress()) { |
65d64f36 PX |
2085 | error_setg(errp, "There is a dump in process, please wait."); |
2086 | return; | |
2087 | } | |
2088 | ||
b53ccc30 QN |
2089 | /* |
2090 | * kdump-compressed format need the whole memory dumped, so paging or | |
2091 | * filter is not supported here. | |
2092 | */ | |
2093 | if ((has_format && format != DUMP_GUEST_MEMORY_FORMAT_ELF) && | |
2094 | (paging || has_begin || has_length)) { | |
2095 | error_setg(errp, "kdump-compressed format doesn't support paging or " | |
2096 | "filter"); | |
2097 | return; | |
2098 | } | |
783e9b48 | 2099 | if (has_begin && !has_length) { |
c6bd8c70 | 2100 | error_setg(errp, QERR_MISSING_PARAMETER, "length"); |
783e9b48 WC |
2101 | return; |
2102 | } | |
2103 | if (!has_begin && has_length) { | |
c6bd8c70 | 2104 | error_setg(errp, QERR_MISSING_PARAMETER, "begin"); |
783e9b48 WC |
2105 | return; |
2106 | } | |
1fbeff72 PX |
2107 | if (has_detach) { |
2108 | detach_p = detach; | |
2109 | } | |
783e9b48 | 2110 | |
b53ccc30 QN |
2111 | /* check whether lzo/snappy is supported */ |
2112 | #ifndef CONFIG_LZO | |
2113 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO) { | |
2114 | error_setg(errp, "kdump-lzo is not available now"); | |
2115 | return; | |
2116 | } | |
2117 | #endif | |
2118 | ||
2119 | #ifndef CONFIG_SNAPPY | |
2120 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY) { | |
2121 | error_setg(errp, "kdump-snappy is not available now"); | |
2122 | return; | |
2123 | } | |
2124 | #endif | |
2125 | ||
efc3146a PMD |
2126 | if (has_format && format == DUMP_GUEST_MEMORY_FORMAT_WIN_DMP |
2127 | && !win_dump_available(errp)) { | |
2da91b54 VP |
2128 | return; |
2129 | } | |
2da91b54 | 2130 | |
783e9b48 WC |
2131 | #if !defined(WIN32) |
2132 | if (strstart(file, "fd:", &p)) { | |
947e4744 | 2133 | fd = monitor_get_fd(monitor_cur(), p, errp); |
783e9b48 | 2134 | if (fd == -1) { |
783e9b48 WC |
2135 | return; |
2136 | } | |
2137 | } | |
2138 | #endif | |
2139 | ||
2140 | if (strstart(file, "file:", &p)) { | |
448058aa | 2141 | fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); |
783e9b48 | 2142 | if (fd < 0) { |
7581766b | 2143 | error_setg_file_open(errp, errno, p); |
783e9b48 WC |
2144 | return; |
2145 | } | |
2146 | } | |
2147 | ||
2148 | if (fd == -1) { | |
c6bd8c70 | 2149 | error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); |
783e9b48 WC |
2150 | return; |
2151 | } | |
2152 | ||
b7bc6b18 PX |
2153 | if (!dump_migration_blocker) { |
2154 | error_setg(&dump_migration_blocker, | |
2155 | "Live migration disabled: dump-guest-memory in progress"); | |
2156 | } | |
2157 | ||
2158 | /* | |
2159 | * Allows even for -only-migratable, but forbid migration during the | |
2160 | * process of dump guest memory. | |
2161 | */ | |
2162 | if (migrate_add_blocker_internal(dump_migration_blocker, errp)) { | |
2163 | /* Remember to release the fd before passing it over to dump state */ | |
2164 | close(fd); | |
2165 | return; | |
2166 | } | |
2167 | ||
baf28f57 PX |
2168 | s = &dump_state_global; |
2169 | dump_state_prepare(s); | |
783e9b48 | 2170 | |
4c7e251a | 2171 | dump_init(s, fd, has_format, format, paging, has_begin, |
86a518bb JF |
2172 | begin, length, errp); |
2173 | if (*errp) { | |
d73415a3 | 2174 | qatomic_set(&s->status, DUMP_STATUS_FAILED); |
783e9b48 WC |
2175 | return; |
2176 | } | |
2177 | ||
1fbeff72 PX |
2178 | if (detach_p) { |
2179 | /* detached dump */ | |
6796b400 | 2180 | s->detached = true; |
1fbeff72 PX |
2181 | qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread, |
2182 | s, QEMU_THREAD_DETACHED); | |
2183 | } else { | |
2184 | /* sync dump */ | |
2185 | dump_process(s, errp); | |
2186 | } | |
783e9b48 | 2187 | } |
7d6dc7f3 QN |
2188 | |
2189 | DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp) | |
2190 | { | |
7d6dc7f3 | 2191 | DumpGuestMemoryCapability *cap = |
b21e2380 | 2192 | g_new0(DumpGuestMemoryCapability, 1); |
95b3a8c8 | 2193 | DumpGuestMemoryFormatList **tail = &cap->formats; |
7d6dc7f3 QN |
2194 | |
2195 | /* elf is always available */ | |
95b3a8c8 | 2196 | QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_ELF); |
7d6dc7f3 QN |
2197 | |
2198 | /* kdump-zlib is always available */ | |
95b3a8c8 | 2199 | QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB); |
7d6dc7f3 QN |
2200 | |
2201 | /* add new item if kdump-lzo is available */ | |
2202 | #ifdef CONFIG_LZO | |
95b3a8c8 | 2203 | QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO); |
7d6dc7f3 QN |
2204 | #endif |
2205 | ||
2206 | /* add new item if kdump-snappy is available */ | |
2207 | #ifdef CONFIG_SNAPPY | |
95b3a8c8 | 2208 | QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY); |
7d6dc7f3 QN |
2209 | #endif |
2210 | ||
efc3146a PMD |
2211 | if (win_dump_available(NULL)) { |
2212 | QAPI_LIST_APPEND(tail, DUMP_GUEST_MEMORY_FORMAT_WIN_DMP); | |
2213 | } | |
2da91b54 | 2214 | |
7d6dc7f3 QN |
2215 | return cap; |
2216 | } |