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Commit | Line | Data |
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c163b5ca LS |
1 | /* |
2 | * QEMU live block migration | |
3 | * | |
4 | * Copyright IBM, Corp. 2009 | |
5 | * | |
6 | * Authors: | |
7 | * Liran Schour <lirans@il.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "qemu-common.h" | |
15 | #include "block_int.h" | |
16 | #include "hw/hw.h" | |
17 | #include "block-migration.h" | |
18 | #include <assert.h> | |
c163b5ca | 19 | |
6ea44308 | 20 | #define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS) |
c163b5ca LS |
21 | |
22 | #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 | |
23 | #define BLK_MIG_FLAG_EOS 0x02 | |
24 | ||
25 | #define MAX_IS_ALLOCATED_SEARCH 65536 | |
26 | #define MAX_BLOCKS_READ 10000 | |
27 | #define BLOCKS_READ_CHANGE 100 | |
28 | #define INITIAL_BLOCKS_READ 100 | |
29 | ||
30 | //#define DEBUG_BLK_MIGRATION | |
31 | ||
32 | #ifdef DEBUG_BLK_MIGRATION | |
a55eb92c | 33 | #define dprintf(fmt, ...) \ |
c163b5ca LS |
34 | do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
35 | #else | |
a55eb92c | 36 | #define dprintf(fmt, ...) \ |
c163b5ca LS |
37 | do { } while (0) |
38 | #endif | |
39 | ||
a55eb92c JK |
40 | typedef struct BlkMigDevState { |
41 | BlockDriverState *bs; | |
42 | int bulk_completed; | |
43 | int shared_base; | |
44 | struct BlkMigDevState *next; | |
45 | int64_t cur_sector; | |
46 | int64_t total_sectors; | |
47 | int64_t dirty; | |
48 | } BlkMigDevState; | |
49 | ||
c163b5ca LS |
50 | typedef struct BlkMigBlock { |
51 | uint8_t *buf; | |
52 | BlkMigDevState *bmds; | |
53 | int64_t sector; | |
54 | struct iovec iov; | |
55 | QEMUIOVector qiov; | |
56 | BlockDriverAIOCB *aiocb; | |
57 | int ret; | |
58 | struct BlkMigBlock *next; | |
59 | } BlkMigBlock; | |
60 | ||
61 | typedef struct BlkMigState { | |
62 | int bulk_completed; | |
63 | int blk_enable; | |
64 | int shared_base; | |
65 | int no_dirty; | |
66 | QEMUFile *load_file; | |
67 | BlkMigDevState *bmds_first; | |
c163b5ca LS |
68 | BlkMigBlock *first_blk; |
69 | BlkMigBlock *last_blk; | |
70 | int submitted; | |
71 | int read_done; | |
72 | int transferred; | |
73 | int64_t print_completion; | |
74 | } BlkMigState; | |
75 | ||
a55eb92c | 76 | static BlkMigState *block_mig_state = NULL; |
c163b5ca LS |
77 | |
78 | static void blk_mig_read_cb(void *opaque, int ret) | |
79 | { | |
80 | BlkMigBlock *blk = opaque; | |
a55eb92c | 81 | |
c163b5ca | 82 | blk->ret = ret; |
a55eb92c | 83 | |
c163b5ca | 84 | /* insert at the end */ |
a55eb92c | 85 | if (block_mig_state->last_blk == NULL) { |
c163b5ca LS |
86 | block_mig_state->first_blk = blk; |
87 | block_mig_state->last_blk = blk; | |
88 | } else { | |
89 | block_mig_state->last_blk->next = blk; | |
90 | block_mig_state->last_blk = blk; | |
91 | } | |
a55eb92c | 92 | |
c163b5ca LS |
93 | block_mig_state->submitted--; |
94 | block_mig_state->read_done++; | |
95 | assert(block_mig_state->submitted >= 0); | |
c163b5ca LS |
96 | } |
97 | ||
98 | static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms) | |
a55eb92c | 99 | { |
c163b5ca LS |
100 | int nr_sectors; |
101 | int64_t total_sectors, cur_sector = 0; | |
102 | BlockDriverState *bs = bms->bs; | |
103 | BlkMigBlock *blk; | |
a55eb92c | 104 | |
c163b5ca LS |
105 | blk = qemu_malloc(sizeof(BlkMigBlock)); |
106 | blk->buf = qemu_malloc(BLOCK_SIZE); | |
a55eb92c | 107 | |
c163b5ca | 108 | cur_sector = bms->cur_sector; |
6ea44308 | 109 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
a55eb92c JK |
110 | |
111 | if (bms->shared_base) { | |
112 | while (cur_sector < bms->total_sectors && | |
113 | !bdrv_is_allocated(bms->bs, cur_sector, | |
114 | MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) { | |
c163b5ca LS |
115 | cur_sector += nr_sectors; |
116 | } | |
117 | } | |
a55eb92c JK |
118 | |
119 | if (cur_sector >= total_sectors) { | |
c163b5ca LS |
120 | bms->cur_sector = total_sectors; |
121 | qemu_free(blk->buf); | |
122 | qemu_free(blk); | |
123 | return 1; | |
124 | } | |
a55eb92c JK |
125 | |
126 | if (cur_sector >= block_mig_state->print_completion) { | |
c163b5ca LS |
127 | printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors); |
128 | fflush(stdout); | |
a55eb92c | 129 | block_mig_state->print_completion += |
6ea44308 | 130 | (BDRV_SECTORS_PER_DIRTY_CHUNK * 10000); |
c163b5ca | 131 | } |
a55eb92c | 132 | |
6ea44308 JK |
133 | /* we are going to transfer a full block even if it is not allocated */ |
134 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
c163b5ca | 135 | |
6ea44308 | 136 | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1); |
a55eb92c | 137 | |
6ea44308 | 138 | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
c163b5ca LS |
139 | nr_sectors = (total_sectors - cur_sector); |
140 | } | |
a55eb92c | 141 | |
c163b5ca LS |
142 | bms->cur_sector = cur_sector + nr_sectors; |
143 | blk->sector = cur_sector; | |
144 | blk->bmds = bms; | |
145 | blk->next = NULL; | |
a55eb92c | 146 | |
c163b5ca | 147 | blk->iov.iov_base = blk->buf; |
6ea44308 | 148 | blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
c163b5ca | 149 | qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); |
a55eb92c | 150 | |
c163b5ca LS |
151 | blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
152 | nr_sectors, blk_mig_read_cb, blk); | |
a55eb92c JK |
153 | |
154 | if (!blk->aiocb) { | |
c163b5ca LS |
155 | printf("Error reading sector %" PRId64 "\n", cur_sector); |
156 | qemu_free(blk->buf); | |
157 | qemu_free(blk); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | bdrv_reset_dirty(bms->bs, cur_sector, nr_sectors); | |
162 | block_mig_state->submitted++; | |
a55eb92c | 163 | |
c163b5ca LS |
164 | return (bms->cur_sector >= total_sectors); |
165 | } | |
166 | ||
167 | static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds) | |
a55eb92c | 168 | { |
c163b5ca LS |
169 | int len, nr_sectors; |
170 | int64_t total_sectors = bmds->total_sectors, cur_sector = 0; | |
171 | uint8_t *tmp_buf = NULL; | |
172 | BlockDriverState *bs = bmds->bs; | |
173 | ||
174 | tmp_buf = qemu_malloc(BLOCK_SIZE); | |
a55eb92c | 175 | |
c163b5ca | 176 | cur_sector = bmds->cur_sector; |
a55eb92c JK |
177 | |
178 | if (bmds->shared_base) { | |
179 | while (cur_sector < bmds->total_sectors && | |
180 | !bdrv_is_allocated(bmds->bs, cur_sector, | |
181 | MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) { | |
c163b5ca LS |
182 | cur_sector += nr_sectors; |
183 | } | |
184 | } | |
a55eb92c JK |
185 | |
186 | if (cur_sector >= total_sectors) { | |
c163b5ca LS |
187 | bmds->cur_sector = total_sectors; |
188 | qemu_free(tmp_buf); | |
189 | return 1; | |
190 | } | |
a55eb92c JK |
191 | |
192 | if (cur_sector >= block_mig_state->print_completion) { | |
c163b5ca LS |
193 | printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors); |
194 | fflush(stdout); | |
a55eb92c | 195 | block_mig_state->print_completion += |
6ea44308 | 196 | (BDRV_SECTORS_PER_DIRTY_CHUNK * 10000); |
c163b5ca | 197 | } |
a55eb92c | 198 | |
6ea44308 | 199 | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1); |
a55eb92c | 200 | |
6ea44308 JK |
201 | /* we are going to transfer a full block even if it is not allocated */ |
202 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
a55eb92c | 203 | |
6ea44308 | 204 | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
c163b5ca LS |
205 | nr_sectors = (total_sectors - cur_sector); |
206 | } | |
a55eb92c JK |
207 | |
208 | if (bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) { | |
c163b5ca LS |
209 | printf("Error reading sector %" PRId64 "\n", cur_sector); |
210 | } | |
211 | ||
212 | bdrv_reset_dirty(bs, cur_sector, nr_sectors); | |
a55eb92c JK |
213 | |
214 | /* sector number and flags */ | |
6ea44308 JK |
215 | qemu_put_be64(f, (cur_sector << BDRV_SECTOR_BITS) |
216 | | BLK_MIG_FLAG_DEVICE_BLOCK); | |
a55eb92c JK |
217 | |
218 | /* device name */ | |
c163b5ca LS |
219 | len = strlen(bs->device_name); |
220 | qemu_put_byte(f, len); | |
221 | qemu_put_buffer(f, (uint8_t *)bs->device_name, len); | |
a55eb92c JK |
222 | |
223 | qemu_put_buffer(f, tmp_buf, BLOCK_SIZE); | |
224 | ||
6ea44308 | 225 | bmds->cur_sector = cur_sector + BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 226 | |
c163b5ca | 227 | qemu_free(tmp_buf); |
a55eb92c | 228 | |
c163b5ca LS |
229 | return (bmds->cur_sector >= total_sectors); |
230 | } | |
231 | ||
232 | static void send_blk(QEMUFile *f, BlkMigBlock * blk) | |
233 | { | |
234 | int len; | |
a55eb92c JK |
235 | |
236 | /* sector number and flags */ | |
6ea44308 JK |
237 | qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
238 | | BLK_MIG_FLAG_DEVICE_BLOCK); | |
a55eb92c JK |
239 | |
240 | /* device name */ | |
c163b5ca LS |
241 | len = strlen(blk->bmds->bs->device_name); |
242 | qemu_put_byte(f, len); | |
243 | qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); | |
a55eb92c JK |
244 | |
245 | qemu_put_buffer(f, blk->buf, BLOCK_SIZE); | |
c163b5ca LS |
246 | } |
247 | ||
248 | static void blk_mig_save_dev_info(QEMUFile *f, BlkMigDevState *bmds) | |
249 | { | |
250 | } | |
251 | ||
252 | static void set_dirty_tracking(int enable) | |
253 | { | |
254 | BlkMigDevState *bmds; | |
a55eb92c JK |
255 | for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) { |
256 | bdrv_set_dirty_tracking(bmds->bs, enable); | |
c163b5ca | 257 | } |
c163b5ca LS |
258 | } |
259 | ||
260 | static void init_blk_migration(QEMUFile *f) | |
261 | { | |
262 | BlkMigDevState **pbmds, *bmds; | |
263 | BlockDriverState *bs; | |
a55eb92c | 264 | |
c163b5ca | 265 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
a55eb92c | 266 | if (bs->type == BDRV_TYPE_HD) { |
c163b5ca LS |
267 | bmds = qemu_mallocz(sizeof(BlkMigDevState)); |
268 | bmds->bs = bs; | |
269 | bmds->bulk_completed = 0; | |
6ea44308 | 270 | bmds->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
c163b5ca | 271 | bmds->shared_base = block_mig_state->shared_base; |
a55eb92c JK |
272 | |
273 | if (bmds->shared_base) { | |
274 | printf("Start migration for %s with shared base image\n", | |
c163b5ca LS |
275 | bs->device_name); |
276 | } else { | |
277 | printf("Start full migration for %s\n", bs->device_name); | |
278 | } | |
a55eb92c | 279 | |
c163b5ca LS |
280 | /* insert at the end */ |
281 | pbmds = &block_mig_state->bmds_first; | |
a55eb92c | 282 | while (*pbmds != NULL) { |
c163b5ca | 283 | pbmds = &(*pbmds)->next; |
a55eb92c | 284 | } |
c163b5ca | 285 | *pbmds = bmds; |
a55eb92c | 286 | |
c163b5ca | 287 | blk_mig_save_dev_info(f, bmds); |
c163b5ca | 288 | } |
a55eb92c | 289 | } |
c163b5ca LS |
290 | } |
291 | ||
292 | static int blk_mig_save_bulked_block(QEMUFile *f, int is_async) | |
293 | { | |
294 | BlkMigDevState *bmds; | |
295 | ||
296 | for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) { | |
a55eb92c JK |
297 | if (bmds->bulk_completed == 0) { |
298 | if (is_async) { | |
299 | if (mig_read_device_bulk(f, bmds) == 1) { | |
c163b5ca LS |
300 | /* completed bulk section for this device */ |
301 | bmds->bulk_completed = 1; | |
302 | } | |
303 | } else { | |
a55eb92c | 304 | if (mig_save_device_bulk(f, bmds) == 1) { |
c163b5ca LS |
305 | /* completed bulk section for this device */ |
306 | bmds->bulk_completed = 1; | |
307 | } | |
308 | } | |
309 | return 1; | |
310 | } | |
311 | } | |
a55eb92c | 312 | |
c163b5ca LS |
313 | /* we reached here means bulk is completed */ |
314 | block_mig_state->bulk_completed = 1; | |
a55eb92c | 315 | |
c163b5ca | 316 | return 0; |
c163b5ca LS |
317 | } |
318 | ||
319 | #define MAX_NUM_BLOCKS 4 | |
320 | ||
321 | static void blk_mig_save_dirty_blocks(QEMUFile *f) | |
322 | { | |
323 | BlkMigDevState *bmds; | |
324 | uint8_t buf[BLOCK_SIZE]; | |
325 | int64_t sector; | |
326 | int len; | |
a55eb92c JK |
327 | |
328 | for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) { | |
329 | for (sector = 0; sector < bmds->cur_sector;) { | |
330 | if (bdrv_get_dirty(bmds->bs, sector)) { | |
331 | if (bdrv_read(bmds->bs, sector, buf, | |
6ea44308 | 332 | BDRV_SECTORS_PER_DIRTY_CHUNK) < 0) { |
a55eb92c | 333 | /* FIXME: add error handling */ |
c163b5ca | 334 | } |
a55eb92c JK |
335 | |
336 | /* sector number and flags */ | |
6ea44308 | 337 | qemu_put_be64(f, (sector << BDRV_SECTOR_BITS) |
a55eb92c JK |
338 | | BLK_MIG_FLAG_DEVICE_BLOCK); |
339 | ||
c163b5ca | 340 | /* device name */ |
c163b5ca | 341 | len = strlen(bmds->bs->device_name); |
c163b5ca LS |
342 | qemu_put_byte(f, len); |
343 | qemu_put_buffer(f, (uint8_t *)bmds->bs->device_name, len); | |
a55eb92c | 344 | |
6ea44308 | 345 | qemu_put_buffer(f, buf, BLOCK_SIZE); |
a55eb92c JK |
346 | |
347 | bdrv_reset_dirty(bmds->bs, sector, | |
6ea44308 | 348 | BDRV_SECTORS_PER_DIRTY_CHUNK); |
a55eb92c | 349 | } |
6ea44308 | 350 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
c163b5ca LS |
351 | } |
352 | } | |
c163b5ca LS |
353 | } |
354 | ||
355 | static void flush_blks(QEMUFile* f) | |
356 | { | |
a55eb92c JK |
357 | BlkMigBlock *blk, *next; |
358 | ||
359 | dprintf("%s Enter submitted %d read_done %d transfered\n", __FUNCTION__, | |
c163b5ca | 360 | submitted, read_done, transfered); |
a55eb92c JK |
361 | |
362 | for (blk = block_mig_state->first_blk; | |
363 | blk != NULL && !qemu_file_rate_limit(f); | |
364 | blk = next) { | |
c163b5ca | 365 | send_blk(f, blk); |
a55eb92c JK |
366 | |
367 | next = blk->next; | |
c163b5ca LS |
368 | qemu_free(blk->buf); |
369 | qemu_free(blk); | |
a55eb92c | 370 | |
c163b5ca LS |
371 | block_mig_state->read_done--; |
372 | block_mig_state->transferred++; | |
373 | assert(block_mig_state->read_done >= 0); | |
374 | } | |
375 | block_mig_state->first_blk = blk; | |
a55eb92c JK |
376 | |
377 | if (block_mig_state->first_blk == NULL) { | |
c163b5ca LS |
378 | block_mig_state->last_blk = NULL; |
379 | } | |
380 | ||
a55eb92c JK |
381 | dprintf("%s Exit submitted %d read_done %d transferred%d\n", __FUNCTION__, |
382 | block_mig_state->submitted, block_mig_state->read_done, | |
c163b5ca | 383 | block_mig_state->transferred); |
c163b5ca LS |
384 | } |
385 | ||
386 | static int is_stage2_completed(void) | |
387 | { | |
388 | BlkMigDevState *bmds; | |
a55eb92c JK |
389 | |
390 | if (block_mig_state->submitted > 0) { | |
c163b5ca LS |
391 | return 0; |
392 | } | |
a55eb92c | 393 | |
c163b5ca | 394 | for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) { |
a55eb92c | 395 | if (bmds->bulk_completed == 0) { |
c163b5ca LS |
396 | return 0; |
397 | } | |
398 | } | |
a55eb92c | 399 | |
c163b5ca LS |
400 | return 1; |
401 | } | |
402 | ||
403 | static int block_save_live(QEMUFile *f, int stage, void *opaque) | |
404 | { | |
a55eb92c | 405 | dprintf("Enter save live stage %d submitted %d transferred %d\n", stage, |
c163b5ca | 406 | submitted, transferred); |
a55eb92c JK |
407 | |
408 | if (block_mig_state->blk_enable != 1) { | |
c163b5ca | 409 | /* no need to migrate storage */ |
a55eb92c | 410 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
c163b5ca LS |
411 | return 1; |
412 | } | |
a55eb92c JK |
413 | |
414 | if (stage == 1) { | |
c163b5ca | 415 | init_blk_migration(f); |
a55eb92c | 416 | |
c163b5ca LS |
417 | /* start track dirty blocks */ |
418 | set_dirty_tracking(1); | |
c163b5ca LS |
419 | } |
420 | ||
421 | flush_blks(f); | |
a55eb92c | 422 | |
c163b5ca | 423 | /* control the rate of transfer */ |
a55eb92c JK |
424 | while ((block_mig_state->submitted + |
425 | block_mig_state->read_done) * BLOCK_SIZE < | |
426 | qemu_file_get_rate_limit(f)) { | |
427 | if (blk_mig_save_bulked_block(f, 1) == 0) { | |
428 | /* no more bulk blocks for now */ | |
c163b5ca | 429 | break; |
a55eb92c | 430 | } |
c163b5ca | 431 | } |
a55eb92c | 432 | |
c163b5ca | 433 | flush_blks(f); |
a55eb92c JK |
434 | |
435 | if (stage == 3) { | |
436 | while (blk_mig_save_bulked_block(f, 0) != 0) { | |
437 | /* empty */ | |
438 | } | |
439 | ||
c163b5ca | 440 | blk_mig_save_dirty_blocks(f); |
a55eb92c | 441 | |
c163b5ca | 442 | /* stop track dirty blocks */ |
a55eb92c JK |
443 | set_dirty_tracking(0); |
444 | ||
445 | printf("\nBlock migration completed\n"); | |
c163b5ca | 446 | } |
a55eb92c JK |
447 | |
448 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); | |
449 | ||
c163b5ca LS |
450 | return ((stage == 2) && is_stage2_completed()); |
451 | } | |
452 | ||
453 | static int block_load(QEMUFile *f, void *opaque, int version_id) | |
454 | { | |
455 | int len, flags; | |
456 | char device_name[256]; | |
457 | int64_t addr; | |
458 | BlockDriverState *bs; | |
459 | uint8_t *buf; | |
a55eb92c | 460 | |
c163b5ca | 461 | buf = qemu_malloc(BLOCK_SIZE); |
a55eb92c | 462 | |
c163b5ca | 463 | do { |
c163b5ca | 464 | addr = qemu_get_be64(f); |
a55eb92c | 465 | |
6ea44308 JK |
466 | flags = addr & ~BDRV_SECTOR_MASK; |
467 | addr >>= BDRV_SECTOR_BITS; | |
a55eb92c JK |
468 | |
469 | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { | |
c163b5ca LS |
470 | /* get device name */ |
471 | len = qemu_get_byte(f); | |
a55eb92c | 472 | |
c163b5ca LS |
473 | qemu_get_buffer(f, (uint8_t *)device_name, len); |
474 | device_name[len] = '\0'; | |
a55eb92c | 475 | |
c163b5ca | 476 | bs = bdrv_find(device_name); |
a55eb92c JK |
477 | |
478 | qemu_get_buffer(f, buf, BLOCK_SIZE); | |
479 | if (bs != NULL) { | |
6ea44308 | 480 | bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); |
c163b5ca LS |
481 | } else { |
482 | printf("Error unknown block device %s\n", device_name); | |
a55eb92c | 483 | /* FIXME: add error handling */ |
c163b5ca | 484 | } |
a55eb92c | 485 | } else if (!(flags & BLK_MIG_FLAG_EOS)) { |
c163b5ca | 486 | printf("Unknown flags\n"); |
a55eb92c | 487 | /* FIXME: add error handling */ |
c163b5ca | 488 | } |
a55eb92c JK |
489 | } while (!(flags & BLK_MIG_FLAG_EOS)); |
490 | ||
c163b5ca LS |
491 | qemu_free(buf); |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | static void block_set_params(int blk_enable, int shared_base, void *opaque) | |
497 | { | |
498 | assert(opaque == block_mig_state); | |
499 | ||
500 | block_mig_state->blk_enable = blk_enable; | |
501 | block_mig_state->shared_base = shared_base; | |
a55eb92c | 502 | |
c163b5ca LS |
503 | /* shared base means that blk_enable = 1 */ |
504 | block_mig_state->blk_enable |= shared_base; | |
c163b5ca LS |
505 | } |
506 | ||
507 | void blk_mig_info(void) | |
508 | { | |
509 | BlockDriverState *bs; | |
a55eb92c | 510 | |
c163b5ca LS |
511 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
512 | printf("Device %s\n", bs->device_name); | |
a55eb92c JK |
513 | if (bs->type == BDRV_TYPE_HD) { |
514 | printf("device %s format %s\n", | |
c163b5ca LS |
515 | bs->device_name, bs->drv->format_name); |
516 | } | |
517 | } | |
518 | } | |
519 | ||
520 | void blk_mig_init(void) | |
a55eb92c | 521 | { |
c163b5ca | 522 | block_mig_state = qemu_mallocz(sizeof(BlkMigState)); |
c163b5ca | 523 | |
a55eb92c JK |
524 | register_savevm_live("block", 0, 1, block_set_params, block_save_live, |
525 | NULL, block_load, block_mig_state); | |
c163b5ca | 526 | } |