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Commit | Line | Data |
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576d1abc JQ |
1 | /* |
2 | * VMState interpreter | |
3 | * | |
4 | * Copyright (c) 2009-2017 Red Hat Inc | |
5 | * | |
6 | * Authors: | |
7 | * Juan Quintela <quintela@redhat.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 | ||
1393a485 | 13 | #include "qemu/osdep.h" |
6666c96a | 14 | #include "migration.h" |
b6fcfa59 | 15 | #include "migration/vmstate.h" |
53d37d36 | 16 | #include "savevm.h" |
848a0503 | 17 | #include "qapi/error.h" |
3ddba9a9 | 18 | #include "qapi/qmp/json-writer.h" |
08a0aee1 | 19 | #include "qemu-file.h" |
b6fcfa59 | 20 | #include "qemu/bitops.h" |
6a64b644 | 21 | #include "qemu/error-report.h" |
9013dca5 | 22 | #include "trace.h" |
b6fcfa59 | 23 | |
f3cadd39 | 24 | static int vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd, |
3ddba9a9 | 25 | void *opaque, JSONWriter *vmdesc); |
b6fcfa59 EH |
26 | static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd, |
27 | void *opaque); | |
28 | ||
579cedf4 PX |
29 | /* Whether this field should exist for either save or load the VM? */ |
30 | static bool | |
31 | vmstate_field_exists(const VMStateDescription *vmsd, const VMStateField *field, | |
32 | void *opaque, int version_id) | |
33 | { | |
34 | bool result; | |
35 | ||
36 | if (field->field_exists) { | |
37 | /* If there's the function checker, that's the solo truth */ | |
38 | result = field->field_exists(opaque, version_id); | |
39 | trace_vmstate_field_exists(vmsd->name, field->name, field->version_id, | |
40 | version_id, result); | |
41 | } else { | |
42 | /* | |
43 | * Otherwise, we only save/load if field version is same or older. | |
44 | * For example, when loading from an old binary with old version, | |
45 | * we ignore new fields with newer version_ids. | |
46 | */ | |
47 | result = field->version_id <= version_id; | |
48 | } | |
49 | ||
50 | return result; | |
51 | } | |
52 | ||
03fee66f | 53 | static int vmstate_n_elems(void *opaque, const VMStateField *field) |
35fc1f71 MT |
54 | { |
55 | int n_elems = 1; | |
56 | ||
57 | if (field->flags & VMS_ARRAY) { | |
58 | n_elems = field->num; | |
59 | } else if (field->flags & VMS_VARRAY_INT32) { | |
395cb450 | 60 | n_elems = *(int32_t *)(opaque + field->num_offset); |
35fc1f71 | 61 | } else if (field->flags & VMS_VARRAY_UINT32) { |
395cb450 | 62 | n_elems = *(uint32_t *)(opaque + field->num_offset); |
35fc1f71 | 63 | } else if (field->flags & VMS_VARRAY_UINT16) { |
395cb450 | 64 | n_elems = *(uint16_t *)(opaque + field->num_offset); |
35fc1f71 | 65 | } else if (field->flags & VMS_VARRAY_UINT8) { |
395cb450 | 66 | n_elems = *(uint8_t *)(opaque + field->num_offset); |
35fc1f71 MT |
67 | } |
68 | ||
b47d3af7 JQ |
69 | if (field->flags & VMS_MULTIPLY_ELEMENTS) { |
70 | n_elems *= field->num; | |
71 | } | |
72 | ||
023ad1a6 | 73 | trace_vmstate_n_elems(field->name, n_elems); |
35fc1f71 MT |
74 | return n_elems; |
75 | } | |
76 | ||
03fee66f | 77 | static int vmstate_size(void *opaque, const VMStateField *field) |
35fc1f71 MT |
78 | { |
79 | int size = field->size; | |
80 | ||
81 | if (field->flags & VMS_VBUFFER) { | |
395cb450 | 82 | size = *(int32_t *)(opaque + field->size_offset); |
35fc1f71 MT |
83 | if (field->flags & VMS_MULTIPLY) { |
84 | size *= field->size; | |
85 | } | |
86 | } | |
87 | ||
88 | return size; | |
89 | } | |
90 | ||
03fee66f MAL |
91 | static void vmstate_handle_alloc(void *ptr, const VMStateField *field, |
92 | void *opaque) | |
35fc1f71 | 93 | { |
cbfda0e6 HP |
94 | if (field->flags & VMS_POINTER && field->flags & VMS_ALLOC) { |
95 | gsize size = vmstate_size(opaque, field); | |
96 | size *= vmstate_n_elems(opaque, field); | |
97 | if (size) { | |
98 | *(void **)ptr = g_malloc(size); | |
f32935ea | 99 | } |
35fc1f71 | 100 | } |
35fc1f71 MT |
101 | } |
102 | ||
b6fcfa59 EH |
103 | int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd, |
104 | void *opaque, int version_id) | |
105 | { | |
03fee66f | 106 | const VMStateField *field = vmsd->fields; |
a5df2a02 | 107 | int ret = 0; |
b6fcfa59 | 108 | |
a5df2a02 | 109 | trace_vmstate_load_state(vmsd->name, version_id); |
b6fcfa59 | 110 | if (version_id > vmsd->version_id) { |
cde7ee59 JD |
111 | error_report("%s: incoming version_id %d is too new " |
112 | "for local version_id %d", | |
113 | vmsd->name, version_id, vmsd->version_id); | |
a5df2a02 | 114 | trace_vmstate_load_state_end(vmsd->name, "too new", -EINVAL); |
b6fcfa59 EH |
115 | return -EINVAL; |
116 | } | |
b6fcfa59 | 117 | if (version_id < vmsd->minimum_version_id) { |
cde7ee59 JD |
118 | error_report("%s: incoming version_id %d is too old " |
119 | "for local minimum version_id %d", | |
120 | vmsd->name, version_id, vmsd->minimum_version_id); | |
a5df2a02 | 121 | trace_vmstate_load_state_end(vmsd->name, "too old", -EINVAL); |
767adce2 | 122 | return -EINVAL; |
b6fcfa59 EH |
123 | } |
124 | if (vmsd->pre_load) { | |
7f3de3f0 | 125 | ret = vmsd->pre_load(opaque); |
b6fcfa59 EH |
126 | if (ret) { |
127 | return ret; | |
128 | } | |
129 | } | |
130 | while (field->name) { | |
a5df2a02 | 131 | trace_vmstate_load_state_field(vmsd->name, field->name); |
579cedf4 | 132 | if (vmstate_field_exists(vmsd, field, opaque, version_id)) { |
cbfda0e6 | 133 | void *first_elem = opaque + field->offset; |
35fc1f71 MT |
134 | int i, n_elems = vmstate_n_elems(opaque, field); |
135 | int size = vmstate_size(opaque, field); | |
136 | ||
cbfda0e6 HP |
137 | vmstate_handle_alloc(first_elem, field, opaque); |
138 | if (field->flags & VMS_POINTER) { | |
139 | first_elem = *(void **)first_elem; | |
e1e686c1 | 140 | assert(first_elem || !n_elems || !size); |
cbfda0e6 | 141 | } |
b6fcfa59 | 142 | for (i = 0; i < n_elems; i++) { |
e84641f7 | 143 | void *curr_elem = first_elem + size * i; |
b6fcfa59 EH |
144 | |
145 | if (field->flags & VMS_ARRAY_OF_POINTER) { | |
e84641f7 | 146 | curr_elem = *(void **)curr_elem; |
b6fcfa59 | 147 | } |
e1e686c1 | 148 | if (!curr_elem && size) { |
07d4e691 HP |
149 | /* if null pointer check placeholder and do not follow */ |
150 | assert(field->flags & VMS_ARRAY_OF_POINTER); | |
151 | ret = vmstate_info_nullptr.get(f, curr_elem, size, NULL); | |
152 | } else if (field->flags & VMS_STRUCT) { | |
e84641f7 | 153 | ret = vmstate_load_state(f, field->vmsd, curr_elem, |
b6fcfa59 | 154 | field->vmsd->version_id); |
2dc6660b CM |
155 | } else if (field->flags & VMS_VSTRUCT) { |
156 | ret = vmstate_load_state(f, field->vmsd, curr_elem, | |
157 | field->struct_version_id); | |
b6fcfa59 | 158 | } else { |
e84641f7 | 159 | ret = field->info->get(f, curr_elem, size, field); |
b6fcfa59 | 160 | } |
13cde508 JQ |
161 | if (ret >= 0) { |
162 | ret = qemu_file_get_error(f); | |
163 | } | |
b6fcfa59 | 164 | if (ret < 0) { |
13cde508 | 165 | qemu_file_set_error(f, ret); |
a1771070 DDAG |
166 | error_report("Failed to load %s:%s", vmsd->name, |
167 | field->name); | |
9013dca5 | 168 | trace_vmstate_load_field_error(field->name, ret); |
b6fcfa59 EH |
169 | return ret; |
170 | } | |
171 | } | |
5bf81c8d | 172 | } else if (field->flags & VMS_MUST_EXIST) { |
6a64b644 DDAG |
173 | error_report("Input validation failed: %s/%s", |
174 | vmsd->name, field->name); | |
5bf81c8d | 175 | return -1; |
b6fcfa59 EH |
176 | } |
177 | field++; | |
178 | } | |
89c56848 | 179 | assert(field->flags == VMS_END); |
b6fcfa59 EH |
180 | ret = vmstate_subsection_load(f, vmsd, opaque); |
181 | if (ret != 0) { | |
182 | return ret; | |
183 | } | |
184 | if (vmsd->post_load) { | |
a5df2a02 | 185 | ret = vmsd->post_load(opaque, version_id); |
b6fcfa59 | 186 | } |
a5df2a02 DDAG |
187 | trace_vmstate_load_state_end(vmsd->name, "end", ret); |
188 | return ret; | |
b6fcfa59 EH |
189 | } |
190 | ||
03fee66f MAL |
191 | static int vmfield_name_num(const VMStateField *start, |
192 | const VMStateField *search) | |
8118f095 | 193 | { |
03fee66f | 194 | const VMStateField *field; |
8118f095 AG |
195 | int found = 0; |
196 | ||
197 | for (field = start; field->name; field++) { | |
198 | if (!strcmp(field->name, search->name)) { | |
199 | if (field == search) { | |
200 | return found; | |
201 | } | |
202 | found++; | |
203 | } | |
204 | } | |
205 | ||
206 | return -1; | |
207 | } | |
208 | ||
03fee66f MAL |
209 | static bool vmfield_name_is_unique(const VMStateField *start, |
210 | const VMStateField *search) | |
8118f095 | 211 | { |
03fee66f | 212 | const VMStateField *field; |
8118f095 AG |
213 | int found = 0; |
214 | ||
215 | for (field = start; field->name; field++) { | |
216 | if (!strcmp(field->name, search->name)) { | |
217 | found++; | |
218 | /* name found more than once, so it's not unique */ | |
219 | if (found > 1) { | |
220 | return false; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | return true; | |
226 | } | |
227 | ||
03fee66f | 228 | static const char *vmfield_get_type_name(const VMStateField *field) |
8118f095 AG |
229 | { |
230 | const char *type = "unknown"; | |
231 | ||
232 | if (field->flags & VMS_STRUCT) { | |
233 | type = "struct"; | |
2dc6660b CM |
234 | } else if (field->flags & VMS_VSTRUCT) { |
235 | type = "vstruct"; | |
8118f095 AG |
236 | } else if (field->info->name) { |
237 | type = field->info->name; | |
238 | } | |
239 | ||
240 | return type; | |
241 | } | |
242 | ||
03fee66f | 243 | static bool vmsd_can_compress(const VMStateField *field) |
8118f095 AG |
244 | { |
245 | if (field->field_exists) { | |
246 | /* Dynamically existing fields mess up compression */ | |
247 | return false; | |
248 | } | |
249 | ||
250 | if (field->flags & VMS_STRUCT) { | |
03fee66f | 251 | const VMStateField *sfield = field->vmsd->fields; |
8118f095 AG |
252 | while (sfield->name) { |
253 | if (!vmsd_can_compress(sfield)) { | |
254 | /* Child elements can't compress, so can't we */ | |
255 | return false; | |
256 | } | |
257 | sfield++; | |
258 | } | |
259 | ||
260 | if (field->vmsd->subsections) { | |
261 | /* Subsections may come and go, better don't compress */ | |
262 | return false; | |
263 | } | |
264 | } | |
265 | ||
266 | return true; | |
267 | } | |
268 | ||
3ddba9a9 MA |
269 | static void vmsd_desc_field_start(const VMStateDescription *vmsd, |
270 | JSONWriter *vmdesc, | |
03fee66f | 271 | const VMStateField *field, int i, int max) |
8118f095 AG |
272 | { |
273 | char *name, *old_name; | |
274 | bool is_array = max > 1; | |
275 | bool can_compress = vmsd_can_compress(field); | |
276 | ||
277 | if (!vmdesc) { | |
278 | return; | |
279 | } | |
280 | ||
281 | name = g_strdup(field->name); | |
282 | ||
283 | /* Field name is not unique, need to make it unique */ | |
284 | if (!vmfield_name_is_unique(vmsd->fields, field)) { | |
285 | int num = vmfield_name_num(vmsd->fields, field); | |
286 | old_name = name; | |
287 | name = g_strdup_printf("%s[%d]", name, num); | |
288 | g_free(old_name); | |
289 | } | |
290 | ||
3ddba9a9 MA |
291 | json_writer_start_object(vmdesc, NULL); |
292 | json_writer_str(vmdesc, "name", name); | |
8118f095 AG |
293 | if (is_array) { |
294 | if (can_compress) { | |
3ddba9a9 | 295 | json_writer_int64(vmdesc, "array_len", max); |
8118f095 | 296 | } else { |
3ddba9a9 | 297 | json_writer_int64(vmdesc, "index", i); |
8118f095 AG |
298 | } |
299 | } | |
3ddba9a9 | 300 | json_writer_str(vmdesc, "type", vmfield_get_type_name(field)); |
8118f095 AG |
301 | |
302 | if (field->flags & VMS_STRUCT) { | |
3ddba9a9 | 303 | json_writer_start_object(vmdesc, "struct"); |
8118f095 AG |
304 | } |
305 | ||
306 | g_free(name); | |
307 | } | |
308 | ||
3ddba9a9 MA |
309 | static void vmsd_desc_field_end(const VMStateDescription *vmsd, |
310 | JSONWriter *vmdesc, | |
03fee66f | 311 | const VMStateField *field, size_t size, int i) |
8118f095 AG |
312 | { |
313 | if (!vmdesc) { | |
314 | return; | |
315 | } | |
316 | ||
317 | if (field->flags & VMS_STRUCT) { | |
318 | /* We printed a struct in between, close its child object */ | |
3ddba9a9 | 319 | json_writer_end_object(vmdesc); |
8118f095 AG |
320 | } |
321 | ||
3ddba9a9 MA |
322 | json_writer_int64(vmdesc, "size", size); |
323 | json_writer_end_object(vmdesc); | |
8118f095 AG |
324 | } |
325 | ||
df896152 JQ |
326 | |
327 | bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque) | |
328 | { | |
329 | if (vmsd->needed && !vmsd->needed(opaque)) { | |
330 | /* optional section not needed */ | |
331 | return false; | |
332 | } | |
333 | return true; | |
334 | } | |
335 | ||
336 | ||
551dbd08 | 337 | int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, |
3ddba9a9 | 338 | void *opaque, JSONWriter *vmdesc_id) |
2dc6660b | 339 | { |
969298f9 TG |
340 | return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_id, NULL); |
341 | } | |
342 | ||
343 | int vmstate_save_state_with_err(QEMUFile *f, const VMStateDescription *vmsd, | |
344 | void *opaque, JSONWriter *vmdesc_id, Error **errp) | |
345 | { | |
346 | return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_id, errp); | |
2dc6660b CM |
347 | } |
348 | ||
349 | int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd, | |
969298f9 | 350 | void *opaque, JSONWriter *vmdesc, int version_id, Error **errp) |
b6fcfa59 | 351 | { |
551dbd08 | 352 | int ret = 0; |
03fee66f | 353 | const VMStateField *field = vmsd->fields; |
b6fcfa59 | 354 | |
46a02a74 DDAG |
355 | trace_vmstate_save_state_top(vmsd->name); |
356 | ||
b6fcfa59 | 357 | if (vmsd->pre_save) { |
551dbd08 DDAG |
358 | ret = vmsd->pre_save(opaque); |
359 | trace_vmstate_save_state_pre_save_res(vmsd->name, ret); | |
360 | if (ret) { | |
848a0503 | 361 | error_setg(errp, "pre-save failed: %s", vmsd->name); |
551dbd08 DDAG |
362 | return ret; |
363 | } | |
b6fcfa59 | 364 | } |
8118f095 AG |
365 | |
366 | if (vmdesc) { | |
3ddba9a9 MA |
367 | json_writer_str(vmdesc, "vmsd_name", vmsd->name); |
368 | json_writer_int64(vmdesc, "version", version_id); | |
369 | json_writer_start_array(vmdesc, "fields"); | |
8118f095 AG |
370 | } |
371 | ||
b6fcfa59 | 372 | while (field->name) { |
579cedf4 | 373 | if (vmstate_field_exists(vmsd, field, opaque, version_id)) { |
cbfda0e6 | 374 | void *first_elem = opaque + field->offset; |
35fc1f71 MT |
375 | int i, n_elems = vmstate_n_elems(opaque, field); |
376 | int size = vmstate_size(opaque, field); | |
61abf1eb | 377 | uint64_t old_offset, written_bytes; |
3ddba9a9 | 378 | JSONWriter *vmdesc_loop = vmdesc; |
35fc1f71 | 379 | |
46a02a74 | 380 | trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems); |
cbfda0e6 HP |
381 | if (field->flags & VMS_POINTER) { |
382 | first_elem = *(void **)first_elem; | |
e1e686c1 | 383 | assert(first_elem || !n_elems || !size); |
cbfda0e6 | 384 | } |
b6fcfa59 | 385 | for (i = 0; i < n_elems; i++) { |
e84641f7 | 386 | void *curr_elem = first_elem + size * i; |
b6fcfa59 | 387 | |
8118f095 | 388 | vmsd_desc_field_start(vmsd, vmdesc_loop, field, i, n_elems); |
fc95c63b | 389 | old_offset = qemu_file_transferred_noflush(f); |
b6fcfa59 | 390 | if (field->flags & VMS_ARRAY_OF_POINTER) { |
e84641f7 HP |
391 | assert(curr_elem); |
392 | curr_elem = *(void **)curr_elem; | |
b6fcfa59 | 393 | } |
e1e686c1 | 394 | if (!curr_elem && size) { |
07d4e691 HP |
395 | /* if null pointer write placeholder and do not follow */ |
396 | assert(field->flags & VMS_ARRAY_OF_POINTER); | |
88b0faf1 DDAG |
397 | ret = vmstate_info_nullptr.put(f, curr_elem, size, NULL, |
398 | NULL); | |
07d4e691 | 399 | } else if (field->flags & VMS_STRUCT) { |
88b0faf1 DDAG |
400 | ret = vmstate_save_state(f, field->vmsd, curr_elem, |
401 | vmdesc_loop); | |
2dc6660b CM |
402 | } else if (field->flags & VMS_VSTRUCT) { |
403 | ret = vmstate_save_state_v(f, field->vmsd, curr_elem, | |
404 | vmdesc_loop, | |
969298f9 | 405 | field->struct_version_id, errp); |
b6fcfa59 | 406 | } else { |
88b0faf1 DDAG |
407 | ret = field->info->put(f, curr_elem, size, field, |
408 | vmdesc_loop); | |
409 | } | |
410 | if (ret) { | |
848a0503 TG |
411 | error_setg(errp, "Save of field %s/%s failed", |
412 | vmsd->name, field->name); | |
8c07559f AL |
413 | if (vmsd->post_save) { |
414 | vmsd->post_save(opaque); | |
415 | } | |
88b0faf1 | 416 | return ret; |
b6fcfa59 | 417 | } |
8118f095 | 418 | |
fc95c63b | 419 | written_bytes = qemu_file_transferred_noflush(f) - old_offset; |
8118f095 AG |
420 | vmsd_desc_field_end(vmsd, vmdesc_loop, field, written_bytes, i); |
421 | ||
422 | /* Compressed arrays only care about the first element */ | |
423 | if (vmdesc_loop && vmsd_can_compress(field)) { | |
424 | vmdesc_loop = NULL; | |
425 | } | |
b6fcfa59 | 426 | } |
5bf81c8d MT |
427 | } else { |
428 | if (field->flags & VMS_MUST_EXIST) { | |
6a64b644 | 429 | error_report("Output state validation failed: %s/%s", |
5bf81c8d MT |
430 | vmsd->name, field->name); |
431 | assert(!(field->flags & VMS_MUST_EXIST)); | |
432 | } | |
b6fcfa59 EH |
433 | } |
434 | field++; | |
435 | } | |
89c56848 | 436 | assert(field->flags == VMS_END); |
8118f095 AG |
437 | |
438 | if (vmdesc) { | |
3ddba9a9 | 439 | json_writer_end_array(vmdesc); |
8118f095 AG |
440 | } |
441 | ||
8c07559f AL |
442 | ret = vmstate_subsection_save(f, vmsd, opaque, vmdesc); |
443 | ||
444 | if (vmsd->post_save) { | |
445 | int ps_ret = vmsd->post_save(opaque); | |
446 | if (!ret) { | |
447 | ret = ps_ret; | |
448 | } | |
449 | } | |
450 | return ret; | |
b6fcfa59 EH |
451 | } |
452 | ||
453 | static const VMStateDescription * | |
5cd8cada | 454 | vmstate_get_subsection(const VMStateDescription **sub, char *idstr) |
b6fcfa59 | 455 | { |
6f4923fc | 456 | while (sub && *sub) { |
5cd8cada JQ |
457 | if (strcmp(idstr, (*sub)->name) == 0) { |
458 | return *sub; | |
b6fcfa59 EH |
459 | } |
460 | sub++; | |
461 | } | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd, | |
466 | void *opaque) | |
467 | { | |
a5df2a02 DDAG |
468 | trace_vmstate_subsection_load(vmsd->name); |
469 | ||
b6fcfa59 | 470 | while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) { |
7c1e52ba | 471 | char idstr[256], *idstr_ret; |
b6fcfa59 EH |
472 | int ret; |
473 | uint8_t version_id, len, size; | |
474 | const VMStateDescription *sub_vmsd; | |
475 | ||
476 | len = qemu_peek_byte(f, 1); | |
477 | if (len < strlen(vmsd->name) + 1) { | |
478 | /* subsection name has be be "section_name/a" */ | |
023ad1a6 | 479 | trace_vmstate_subsection_load_bad(vmsd->name, "(short)", ""); |
b6fcfa59 EH |
480 | return 0; |
481 | } | |
7c1e52ba | 482 | size = qemu_peek_buffer(f, (uint8_t **)&idstr_ret, len, 2); |
b6fcfa59 | 483 | if (size != len) { |
023ad1a6 | 484 | trace_vmstate_subsection_load_bad(vmsd->name, "(peek fail)", ""); |
b6fcfa59 EH |
485 | return 0; |
486 | } | |
7c1e52ba | 487 | memcpy(idstr, idstr_ret, size); |
b6fcfa59 EH |
488 | idstr[size] = 0; |
489 | ||
490 | if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) { | |
023ad1a6 DDAG |
491 | trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(prefix)"); |
492 | /* it doesn't have a valid subsection name */ | |
b6fcfa59 EH |
493 | return 0; |
494 | } | |
495 | sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr); | |
496 | if (sub_vmsd == NULL) { | |
023ad1a6 | 497 | trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(lookup)"); |
b6fcfa59 EH |
498 | return -ENOENT; |
499 | } | |
500 | qemu_file_skip(f, 1); /* subsection */ | |
501 | qemu_file_skip(f, 1); /* len */ | |
502 | qemu_file_skip(f, len); /* idstr */ | |
503 | version_id = qemu_get_be32(f); | |
504 | ||
505 | ret = vmstate_load_state(f, sub_vmsd, opaque, version_id); | |
506 | if (ret) { | |
023ad1a6 | 507 | trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(child)"); |
b6fcfa59 EH |
508 | return ret; |
509 | } | |
510 | } | |
a5df2a02 DDAG |
511 | |
512 | trace_vmstate_subsection_load_good(vmsd->name); | |
b6fcfa59 EH |
513 | return 0; |
514 | } | |
515 | ||
f3cadd39 | 516 | static int vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd, |
3ddba9a9 | 517 | void *opaque, JSONWriter *vmdesc) |
b6fcfa59 | 518 | { |
5cd8cada | 519 | const VMStateDescription **sub = vmsd->subsections; |
f2dd7edd | 520 | bool vmdesc_has_subsections = false; |
f3cadd39 | 521 | int ret = 0; |
b6fcfa59 | 522 | |
46a02a74 | 523 | trace_vmstate_subsection_save_top(vmsd->name); |
6f4923fc PM |
524 | while (sub && *sub) { |
525 | if (vmstate_save_needed(*sub, opaque)) { | |
46a02a74 | 526 | const VMStateDescription *vmsdsub = *sub; |
b6fcfa59 EH |
527 | uint8_t len; |
528 | ||
46a02a74 | 529 | trace_vmstate_subsection_save_loop(vmsd->name, vmsdsub->name); |
8118f095 AG |
530 | if (vmdesc) { |
531 | /* Only create subsection array when we have any */ | |
f2dd7edd | 532 | if (!vmdesc_has_subsections) { |
3ddba9a9 | 533 | json_writer_start_array(vmdesc, "subsections"); |
f2dd7edd | 534 | vmdesc_has_subsections = true; |
8118f095 AG |
535 | } |
536 | ||
3ddba9a9 | 537 | json_writer_start_object(vmdesc, NULL); |
8118f095 AG |
538 | } |
539 | ||
b6fcfa59 | 540 | qemu_put_byte(f, QEMU_VM_SUBSECTION); |
46a02a74 | 541 | len = strlen(vmsdsub->name); |
b6fcfa59 | 542 | qemu_put_byte(f, len); |
46a02a74 DDAG |
543 | qemu_put_buffer(f, (uint8_t *)vmsdsub->name, len); |
544 | qemu_put_be32(f, vmsdsub->version_id); | |
f3cadd39 DDAG |
545 | ret = vmstate_save_state(f, vmsdsub, opaque, vmdesc); |
546 | if (ret) { | |
547 | return ret; | |
548 | } | |
8118f095 AG |
549 | |
550 | if (vmdesc) { | |
3ddba9a9 | 551 | json_writer_end_object(vmdesc); |
8118f095 | 552 | } |
b6fcfa59 EH |
553 | } |
554 | sub++; | |
555 | } | |
8118f095 | 556 | |
f2dd7edd | 557 | if (vmdesc_has_subsections) { |
3ddba9a9 | 558 | json_writer_end_array(vmdesc); |
8118f095 | 559 | } |
f3cadd39 DDAG |
560 | |
561 | return ret; | |
b6fcfa59 | 562 | } |