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Commit | Line | Data |
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b6fcfa59 EH |
1 | #include "qemu-common.h" |
2 | #include "migration/migration.h" | |
3 | #include "migration/qemu-file.h" | |
4 | #include "migration/vmstate.h" | |
5 | #include "qemu/bitops.h" | |
6a64b644 | 6 | #include "qemu/error-report.h" |
9013dca5 | 7 | #include "trace.h" |
b6fcfa59 EH |
8 | |
9 | static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd, | |
10 | void *opaque); | |
11 | static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd, | |
12 | void *opaque); | |
13 | ||
35fc1f71 MT |
14 | static int vmstate_n_elems(void *opaque, VMStateField *field) |
15 | { | |
16 | int n_elems = 1; | |
17 | ||
18 | if (field->flags & VMS_ARRAY) { | |
19 | n_elems = field->num; | |
20 | } else if (field->flags & VMS_VARRAY_INT32) { | |
21 | n_elems = *(int32_t *)(opaque+field->num_offset); | |
22 | } else if (field->flags & VMS_VARRAY_UINT32) { | |
23 | n_elems = *(uint32_t *)(opaque+field->num_offset); | |
24 | } else if (field->flags & VMS_VARRAY_UINT16) { | |
25 | n_elems = *(uint16_t *)(opaque+field->num_offset); | |
26 | } else if (field->flags & VMS_VARRAY_UINT8) { | |
27 | n_elems = *(uint8_t *)(opaque+field->num_offset); | |
28 | } | |
29 | ||
30 | return n_elems; | |
31 | } | |
32 | ||
33 | static int vmstate_size(void *opaque, VMStateField *field) | |
34 | { | |
35 | int size = field->size; | |
36 | ||
37 | if (field->flags & VMS_VBUFFER) { | |
38 | size = *(int32_t *)(opaque+field->size_offset); | |
39 | if (field->flags & VMS_MULTIPLY) { | |
40 | size *= field->size; | |
41 | } | |
42 | } | |
43 | ||
44 | return size; | |
45 | } | |
46 | ||
f32935ea | 47 | static void *vmstate_base_addr(void *opaque, VMStateField *field, bool alloc) |
35fc1f71 MT |
48 | { |
49 | void *base_addr = opaque + field->offset; | |
50 | ||
51 | if (field->flags & VMS_POINTER) { | |
f32935ea | 52 | if (alloc && (field->flags & VMS_ALLOC)) { |
94ed706d AK |
53 | gsize size = 0; |
54 | if (field->flags & VMS_VBUFFER) { | |
55 | size = vmstate_size(opaque, field); | |
56 | } else { | |
57 | int n_elems = vmstate_n_elems(opaque, field); | |
58 | if (n_elems) { | |
59 | size = n_elems * field->size; | |
60 | } | |
61 | } | |
62 | if (size) { | |
f32935ea AK |
63 | *((void **)base_addr + field->start) = g_malloc(size); |
64 | } | |
65 | } | |
35fc1f71 MT |
66 | base_addr = *(void **)base_addr + field->start; |
67 | } | |
68 | ||
69 | return base_addr; | |
70 | } | |
71 | ||
b6fcfa59 EH |
72 | int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd, |
73 | void *opaque, int version_id) | |
74 | { | |
75 | VMStateField *field = vmsd->fields; | |
76 | int ret; | |
77 | ||
78 | if (version_id > vmsd->version_id) { | |
79 | return -EINVAL; | |
80 | } | |
b6fcfa59 | 81 | if (version_id < vmsd->minimum_version_id) { |
767adce2 PM |
82 | if (vmsd->load_state_old && |
83 | version_id >= vmsd->minimum_version_id_old) { | |
84 | return vmsd->load_state_old(f, opaque, version_id); | |
85 | } | |
86 | return -EINVAL; | |
b6fcfa59 EH |
87 | } |
88 | if (vmsd->pre_load) { | |
89 | int ret = vmsd->pre_load(opaque); | |
90 | if (ret) { | |
91 | return ret; | |
92 | } | |
93 | } | |
94 | while (field->name) { | |
95 | if ((field->field_exists && | |
96 | field->field_exists(opaque, version_id)) || | |
97 | (!field->field_exists && | |
98 | field->version_id <= version_id)) { | |
f32935ea | 99 | void *base_addr = vmstate_base_addr(opaque, field, true); |
35fc1f71 MT |
100 | int i, n_elems = vmstate_n_elems(opaque, field); |
101 | int size = vmstate_size(opaque, field); | |
102 | ||
b6fcfa59 EH |
103 | for (i = 0; i < n_elems; i++) { |
104 | void *addr = base_addr + size * i; | |
105 | ||
106 | if (field->flags & VMS_ARRAY_OF_POINTER) { | |
107 | addr = *(void **)addr; | |
108 | } | |
109 | if (field->flags & VMS_STRUCT) { | |
110 | ret = vmstate_load_state(f, field->vmsd, addr, | |
111 | field->vmsd->version_id); | |
112 | } else { | |
113 | ret = field->info->get(f, addr, size); | |
114 | ||
115 | } | |
13cde508 JQ |
116 | if (ret >= 0) { |
117 | ret = qemu_file_get_error(f); | |
118 | } | |
b6fcfa59 | 119 | if (ret < 0) { |
13cde508 | 120 | qemu_file_set_error(f, ret); |
9013dca5 | 121 | trace_vmstate_load_field_error(field->name, ret); |
b6fcfa59 EH |
122 | return ret; |
123 | } | |
124 | } | |
5bf81c8d | 125 | } else if (field->flags & VMS_MUST_EXIST) { |
6a64b644 DDAG |
126 | error_report("Input validation failed: %s/%s", |
127 | vmsd->name, field->name); | |
5bf81c8d | 128 | return -1; |
b6fcfa59 EH |
129 | } |
130 | field++; | |
131 | } | |
132 | ret = vmstate_subsection_load(f, vmsd, opaque); | |
133 | if (ret != 0) { | |
134 | return ret; | |
135 | } | |
136 | if (vmsd->post_load) { | |
137 | return vmsd->post_load(opaque, version_id); | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
142 | void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, | |
143 | void *opaque) | |
144 | { | |
145 | VMStateField *field = vmsd->fields; | |
146 | ||
147 | if (vmsd->pre_save) { | |
148 | vmsd->pre_save(opaque); | |
149 | } | |
150 | while (field->name) { | |
151 | if (!field->field_exists || | |
152 | field->field_exists(opaque, vmsd->version_id)) { | |
f32935ea | 153 | void *base_addr = vmstate_base_addr(opaque, field, false); |
35fc1f71 MT |
154 | int i, n_elems = vmstate_n_elems(opaque, field); |
155 | int size = vmstate_size(opaque, field); | |
156 | ||
b6fcfa59 EH |
157 | for (i = 0; i < n_elems; i++) { |
158 | void *addr = base_addr + size * i; | |
159 | ||
160 | if (field->flags & VMS_ARRAY_OF_POINTER) { | |
161 | addr = *(void **)addr; | |
162 | } | |
163 | if (field->flags & VMS_STRUCT) { | |
164 | vmstate_save_state(f, field->vmsd, addr); | |
165 | } else { | |
166 | field->info->put(f, addr, size); | |
167 | } | |
168 | } | |
5bf81c8d MT |
169 | } else { |
170 | if (field->flags & VMS_MUST_EXIST) { | |
6a64b644 | 171 | error_report("Output state validation failed: %s/%s", |
5bf81c8d MT |
172 | vmsd->name, field->name); |
173 | assert(!(field->flags & VMS_MUST_EXIST)); | |
174 | } | |
b6fcfa59 EH |
175 | } |
176 | field++; | |
177 | } | |
178 | vmstate_subsection_save(f, vmsd, opaque); | |
179 | } | |
180 | ||
181 | static const VMStateDescription * | |
182 | vmstate_get_subsection(const VMStateSubsection *sub, char *idstr) | |
183 | { | |
184 | while (sub && sub->needed) { | |
185 | if (strcmp(idstr, sub->vmsd->name) == 0) { | |
186 | return sub->vmsd; | |
187 | } | |
188 | sub++; | |
189 | } | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd, | |
194 | void *opaque) | |
195 | { | |
196 | while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) { | |
197 | char idstr[256]; | |
198 | int ret; | |
199 | uint8_t version_id, len, size; | |
200 | const VMStateDescription *sub_vmsd; | |
201 | ||
202 | len = qemu_peek_byte(f, 1); | |
203 | if (len < strlen(vmsd->name) + 1) { | |
204 | /* subsection name has be be "section_name/a" */ | |
205 | return 0; | |
206 | } | |
207 | size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2); | |
208 | if (size != len) { | |
209 | return 0; | |
210 | } | |
211 | idstr[size] = 0; | |
212 | ||
213 | if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) { | |
214 | /* it don't have a valid subsection name */ | |
215 | return 0; | |
216 | } | |
217 | sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr); | |
218 | if (sub_vmsd == NULL) { | |
219 | return -ENOENT; | |
220 | } | |
221 | qemu_file_skip(f, 1); /* subsection */ | |
222 | qemu_file_skip(f, 1); /* len */ | |
223 | qemu_file_skip(f, len); /* idstr */ | |
224 | version_id = qemu_get_be32(f); | |
225 | ||
226 | ret = vmstate_load_state(f, sub_vmsd, opaque, version_id); | |
227 | if (ret) { | |
228 | return ret; | |
229 | } | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd, | |
235 | void *opaque) | |
236 | { | |
237 | const VMStateSubsection *sub = vmsd->subsections; | |
238 | ||
239 | while (sub && sub->needed) { | |
240 | if (sub->needed(opaque)) { | |
241 | const VMStateDescription *vmsd = sub->vmsd; | |
242 | uint8_t len; | |
243 | ||
244 | qemu_put_byte(f, QEMU_VM_SUBSECTION); | |
245 | len = strlen(vmsd->name); | |
246 | qemu_put_byte(f, len); | |
247 | qemu_put_buffer(f, (uint8_t *)vmsd->name, len); | |
248 | qemu_put_be32(f, vmsd->version_id); | |
249 | vmstate_save_state(f, vmsd, opaque); | |
250 | } | |
251 | sub++; | |
252 | } | |
253 | } | |
254 | ||
255 | /* bool */ | |
256 | ||
257 | static int get_bool(QEMUFile *f, void *pv, size_t size) | |
258 | { | |
259 | bool *v = pv; | |
260 | *v = qemu_get_byte(f); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static void put_bool(QEMUFile *f, void *pv, size_t size) | |
265 | { | |
266 | bool *v = pv; | |
267 | qemu_put_byte(f, *v); | |
268 | } | |
269 | ||
270 | const VMStateInfo vmstate_info_bool = { | |
271 | .name = "bool", | |
272 | .get = get_bool, | |
273 | .put = put_bool, | |
274 | }; | |
275 | ||
276 | /* 8 bit int */ | |
277 | ||
278 | static int get_int8(QEMUFile *f, void *pv, size_t size) | |
279 | { | |
280 | int8_t *v = pv; | |
281 | qemu_get_s8s(f, v); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static void put_int8(QEMUFile *f, void *pv, size_t size) | |
286 | { | |
287 | int8_t *v = pv; | |
288 | qemu_put_s8s(f, v); | |
289 | } | |
290 | ||
291 | const VMStateInfo vmstate_info_int8 = { | |
292 | .name = "int8", | |
293 | .get = get_int8, | |
294 | .put = put_int8, | |
295 | }; | |
296 | ||
297 | /* 16 bit int */ | |
298 | ||
299 | static int get_int16(QEMUFile *f, void *pv, size_t size) | |
300 | { | |
301 | int16_t *v = pv; | |
302 | qemu_get_sbe16s(f, v); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static void put_int16(QEMUFile *f, void *pv, size_t size) | |
307 | { | |
308 | int16_t *v = pv; | |
309 | qemu_put_sbe16s(f, v); | |
310 | } | |
311 | ||
312 | const VMStateInfo vmstate_info_int16 = { | |
313 | .name = "int16", | |
314 | .get = get_int16, | |
315 | .put = put_int16, | |
316 | }; | |
317 | ||
318 | /* 32 bit int */ | |
319 | ||
320 | static int get_int32(QEMUFile *f, void *pv, size_t size) | |
321 | { | |
322 | int32_t *v = pv; | |
323 | qemu_get_sbe32s(f, v); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static void put_int32(QEMUFile *f, void *pv, size_t size) | |
328 | { | |
329 | int32_t *v = pv; | |
330 | qemu_put_sbe32s(f, v); | |
331 | } | |
332 | ||
333 | const VMStateInfo vmstate_info_int32 = { | |
334 | .name = "int32", | |
335 | .get = get_int32, | |
336 | .put = put_int32, | |
337 | }; | |
338 | ||
339 | /* 32 bit int. See that the received value is the same than the one | |
340 | in the field */ | |
341 | ||
342 | static int get_int32_equal(QEMUFile *f, void *pv, size_t size) | |
343 | { | |
344 | int32_t *v = pv; | |
345 | int32_t v2; | |
346 | qemu_get_sbe32s(f, &v2); | |
347 | ||
348 | if (*v == v2) { | |
349 | return 0; | |
350 | } | |
351 | return -EINVAL; | |
352 | } | |
353 | ||
354 | const VMStateInfo vmstate_info_int32_equal = { | |
355 | .name = "int32 equal", | |
356 | .get = get_int32_equal, | |
357 | .put = put_int32, | |
358 | }; | |
359 | ||
d2ef4b61 MT |
360 | /* 32 bit int. Check that the received value is non-negative |
361 | * and less than or equal to the one in the field. | |
362 | */ | |
b6fcfa59 EH |
363 | |
364 | static int get_int32_le(QEMUFile *f, void *pv, size_t size) | |
365 | { | |
24a370ef DDAG |
366 | int32_t *cur = pv; |
367 | int32_t loaded; | |
368 | qemu_get_sbe32s(f, &loaded); | |
b6fcfa59 | 369 | |
d2ef4b61 | 370 | if (loaded >= 0 && loaded <= *cur) { |
24a370ef | 371 | *cur = loaded; |
b6fcfa59 EH |
372 | return 0; |
373 | } | |
374 | return -EINVAL; | |
375 | } | |
376 | ||
377 | const VMStateInfo vmstate_info_int32_le = { | |
24a370ef | 378 | .name = "int32 le", |
b6fcfa59 EH |
379 | .get = get_int32_le, |
380 | .put = put_int32, | |
381 | }; | |
382 | ||
383 | /* 64 bit int */ | |
384 | ||
385 | static int get_int64(QEMUFile *f, void *pv, size_t size) | |
386 | { | |
387 | int64_t *v = pv; | |
388 | qemu_get_sbe64s(f, v); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static void put_int64(QEMUFile *f, void *pv, size_t size) | |
393 | { | |
394 | int64_t *v = pv; | |
395 | qemu_put_sbe64s(f, v); | |
396 | } | |
397 | ||
398 | const VMStateInfo vmstate_info_int64 = { | |
399 | .name = "int64", | |
400 | .get = get_int64, | |
401 | .put = put_int64, | |
402 | }; | |
403 | ||
404 | /* 8 bit unsigned int */ | |
405 | ||
406 | static int get_uint8(QEMUFile *f, void *pv, size_t size) | |
407 | { | |
408 | uint8_t *v = pv; | |
409 | qemu_get_8s(f, v); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static void put_uint8(QEMUFile *f, void *pv, size_t size) | |
414 | { | |
415 | uint8_t *v = pv; | |
416 | qemu_put_8s(f, v); | |
417 | } | |
418 | ||
419 | const VMStateInfo vmstate_info_uint8 = { | |
420 | .name = "uint8", | |
421 | .get = get_uint8, | |
422 | .put = put_uint8, | |
423 | }; | |
424 | ||
425 | /* 16 bit unsigned int */ | |
426 | ||
427 | static int get_uint16(QEMUFile *f, void *pv, size_t size) | |
428 | { | |
429 | uint16_t *v = pv; | |
430 | qemu_get_be16s(f, v); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static void put_uint16(QEMUFile *f, void *pv, size_t size) | |
435 | { | |
436 | uint16_t *v = pv; | |
437 | qemu_put_be16s(f, v); | |
438 | } | |
439 | ||
440 | const VMStateInfo vmstate_info_uint16 = { | |
441 | .name = "uint16", | |
442 | .get = get_uint16, | |
443 | .put = put_uint16, | |
444 | }; | |
445 | ||
446 | /* 32 bit unsigned int */ | |
447 | ||
448 | static int get_uint32(QEMUFile *f, void *pv, size_t size) | |
449 | { | |
450 | uint32_t *v = pv; | |
451 | qemu_get_be32s(f, v); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | static void put_uint32(QEMUFile *f, void *pv, size_t size) | |
456 | { | |
457 | uint32_t *v = pv; | |
458 | qemu_put_be32s(f, v); | |
459 | } | |
460 | ||
461 | const VMStateInfo vmstate_info_uint32 = { | |
462 | .name = "uint32", | |
463 | .get = get_uint32, | |
464 | .put = put_uint32, | |
465 | }; | |
466 | ||
467 | /* 32 bit uint. See that the received value is the same than the one | |
468 | in the field */ | |
469 | ||
470 | static int get_uint32_equal(QEMUFile *f, void *pv, size_t size) | |
471 | { | |
472 | uint32_t *v = pv; | |
473 | uint32_t v2; | |
474 | qemu_get_be32s(f, &v2); | |
475 | ||
476 | if (*v == v2) { | |
477 | return 0; | |
478 | } | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | const VMStateInfo vmstate_info_uint32_equal = { | |
483 | .name = "uint32 equal", | |
484 | .get = get_uint32_equal, | |
485 | .put = put_uint32, | |
486 | }; | |
487 | ||
488 | /* 64 bit unsigned int */ | |
489 | ||
490 | static int get_uint64(QEMUFile *f, void *pv, size_t size) | |
491 | { | |
492 | uint64_t *v = pv; | |
493 | qemu_get_be64s(f, v); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static void put_uint64(QEMUFile *f, void *pv, size_t size) | |
498 | { | |
499 | uint64_t *v = pv; | |
500 | qemu_put_be64s(f, v); | |
501 | } | |
502 | ||
503 | const VMStateInfo vmstate_info_uint64 = { | |
504 | .name = "uint64", | |
505 | .get = get_uint64, | |
506 | .put = put_uint64, | |
507 | }; | |
508 | ||
509 | /* 64 bit unsigned int. See that the received value is the same than the one | |
510 | in the field */ | |
511 | ||
512 | static int get_uint64_equal(QEMUFile *f, void *pv, size_t size) | |
513 | { | |
514 | uint64_t *v = pv; | |
515 | uint64_t v2; | |
516 | qemu_get_be64s(f, &v2); | |
517 | ||
518 | if (*v == v2) { | |
519 | return 0; | |
520 | } | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | const VMStateInfo vmstate_info_uint64_equal = { | |
525 | .name = "int64 equal", | |
526 | .get = get_uint64_equal, | |
527 | .put = put_uint64, | |
528 | }; | |
529 | ||
530 | /* 8 bit int. See that the received value is the same than the one | |
531 | in the field */ | |
532 | ||
533 | static int get_uint8_equal(QEMUFile *f, void *pv, size_t size) | |
534 | { | |
535 | uint8_t *v = pv; | |
536 | uint8_t v2; | |
537 | qemu_get_8s(f, &v2); | |
538 | ||
539 | if (*v == v2) { | |
540 | return 0; | |
541 | } | |
542 | return -EINVAL; | |
543 | } | |
544 | ||
545 | const VMStateInfo vmstate_info_uint8_equal = { | |
546 | .name = "uint8 equal", | |
547 | .get = get_uint8_equal, | |
548 | .put = put_uint8, | |
549 | }; | |
550 | ||
551 | /* 16 bit unsigned int int. See that the received value is the same than the one | |
552 | in the field */ | |
553 | ||
554 | static int get_uint16_equal(QEMUFile *f, void *pv, size_t size) | |
555 | { | |
556 | uint16_t *v = pv; | |
557 | uint16_t v2; | |
558 | qemu_get_be16s(f, &v2); | |
559 | ||
560 | if (*v == v2) { | |
561 | return 0; | |
562 | } | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
566 | const VMStateInfo vmstate_info_uint16_equal = { | |
567 | .name = "uint16 equal", | |
568 | .get = get_uint16_equal, | |
569 | .put = put_uint16, | |
570 | }; | |
571 | ||
572 | /* floating point */ | |
573 | ||
574 | static int get_float64(QEMUFile *f, void *pv, size_t size) | |
575 | { | |
576 | float64 *v = pv; | |
577 | ||
578 | *v = make_float64(qemu_get_be64(f)); | |
579 | return 0; | |
580 | } | |
581 | ||
582 | static void put_float64(QEMUFile *f, void *pv, size_t size) | |
583 | { | |
584 | uint64_t *v = pv; | |
585 | ||
586 | qemu_put_be64(f, float64_val(*v)); | |
587 | } | |
588 | ||
589 | const VMStateInfo vmstate_info_float64 = { | |
590 | .name = "float64", | |
591 | .get = get_float64, | |
592 | .put = put_float64, | |
593 | }; | |
594 | ||
595 | /* uint8_t buffers */ | |
596 | ||
597 | static int get_buffer(QEMUFile *f, void *pv, size_t size) | |
598 | { | |
599 | uint8_t *v = pv; | |
600 | qemu_get_buffer(f, v, size); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static void put_buffer(QEMUFile *f, void *pv, size_t size) | |
605 | { | |
606 | uint8_t *v = pv; | |
607 | qemu_put_buffer(f, v, size); | |
608 | } | |
609 | ||
610 | const VMStateInfo vmstate_info_buffer = { | |
611 | .name = "buffer", | |
612 | .get = get_buffer, | |
613 | .put = put_buffer, | |
614 | }; | |
615 | ||
616 | /* unused buffers: space that was used for some fields that are | |
617 | not useful anymore */ | |
618 | ||
619 | static int get_unused_buffer(QEMUFile *f, void *pv, size_t size) | |
620 | { | |
621 | uint8_t buf[1024]; | |
622 | int block_len; | |
623 | ||
624 | while (size > 0) { | |
625 | block_len = MIN(sizeof(buf), size); | |
626 | size -= block_len; | |
627 | qemu_get_buffer(f, buf, block_len); | |
628 | } | |
629 | return 0; | |
630 | } | |
631 | ||
632 | static void put_unused_buffer(QEMUFile *f, void *pv, size_t size) | |
633 | { | |
634 | static const uint8_t buf[1024]; | |
635 | int block_len; | |
636 | ||
637 | while (size > 0) { | |
638 | block_len = MIN(sizeof(buf), size); | |
639 | size -= block_len; | |
640 | qemu_put_buffer(f, buf, block_len); | |
641 | } | |
642 | } | |
643 | ||
644 | const VMStateInfo vmstate_info_unused_buffer = { | |
645 | .name = "unused_buffer", | |
646 | .get = get_unused_buffer, | |
647 | .put = put_unused_buffer, | |
648 | }; | |
649 | ||
650 | /* bitmaps (as defined by bitmap.h). Note that size here is the size | |
651 | * of the bitmap in bits. The on-the-wire format of a bitmap is 64 | |
652 | * bit words with the bits in big endian order. The in-memory format | |
653 | * is an array of 'unsigned long', which may be either 32 or 64 bits. | |
654 | */ | |
655 | /* This is the number of 64 bit words sent over the wire */ | |
656 | #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64) | |
657 | static int get_bitmap(QEMUFile *f, void *pv, size_t size) | |
658 | { | |
659 | unsigned long *bmp = pv; | |
660 | int i, idx = 0; | |
661 | for (i = 0; i < BITS_TO_U64S(size); i++) { | |
662 | uint64_t w = qemu_get_be64(f); | |
663 | bmp[idx++] = w; | |
664 | if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) { | |
665 | bmp[idx++] = w >> 32; | |
666 | } | |
667 | } | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static void put_bitmap(QEMUFile *f, void *pv, size_t size) | |
672 | { | |
673 | unsigned long *bmp = pv; | |
674 | int i, idx = 0; | |
675 | for (i = 0; i < BITS_TO_U64S(size); i++) { | |
676 | uint64_t w = bmp[idx++]; | |
677 | if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) { | |
678 | w |= ((uint64_t)bmp[idx++]) << 32; | |
679 | } | |
680 | qemu_put_be64(f, w); | |
681 | } | |
682 | } | |
683 | ||
684 | const VMStateInfo vmstate_info_bitmap = { | |
685 | .name = "bitmap", | |
686 | .get = get_bitmap, | |
687 | .put = put_bitmap, | |
688 | }; |