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c163b5ca | 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" | |
5e5328be | 17 | #include "qemu-queue.h" |
7184049e | 18 | #include "monitor.h" |
c163b5ca | 19 | #include "block-migration.h" |
20 | #include <assert.h> | |
c163b5ca | 21 | |
6ea44308 | 22 | #define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS) |
c163b5ca | 23 | |
24 | #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 | |
25 | #define BLK_MIG_FLAG_EOS 0x02 | |
01e61e2d | 26 | #define BLK_MIG_FLAG_PROGRESS 0x04 |
c163b5ca | 27 | |
28 | #define MAX_IS_ALLOCATED_SEARCH 65536 | |
29 | #define MAX_BLOCKS_READ 10000 | |
30 | #define BLOCKS_READ_CHANGE 100 | |
31 | #define INITIAL_BLOCKS_READ 100 | |
32 | ||
33 | //#define DEBUG_BLK_MIGRATION | |
34 | ||
35 | #ifdef DEBUG_BLK_MIGRATION | |
a55eb92c | 36 | #define dprintf(fmt, ...) \ |
c163b5ca | 37 | do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
38 | #else | |
a55eb92c | 39 | #define dprintf(fmt, ...) \ |
c163b5ca | 40 | do { } while (0) |
41 | #endif | |
42 | ||
a55eb92c JK |
43 | typedef struct BlkMigDevState { |
44 | BlockDriverState *bs; | |
45 | int bulk_completed; | |
46 | int shared_base; | |
a55eb92c | 47 | int64_t cur_sector; |
82801d8f | 48 | int64_t completed_sectors; |
a55eb92c JK |
49 | int64_t total_sectors; |
50 | int64_t dirty; | |
5e5328be | 51 | QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
a55eb92c JK |
52 | } BlkMigDevState; |
53 | ||
c163b5ca | 54 | typedef struct BlkMigBlock { |
55 | uint8_t *buf; | |
56 | BlkMigDevState *bmds; | |
57 | int64_t sector; | |
58 | struct iovec iov; | |
59 | QEMUIOVector qiov; | |
60 | BlockDriverAIOCB *aiocb; | |
61 | int ret; | |
5e5328be | 62 | QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
c163b5ca | 63 | } BlkMigBlock; |
64 | ||
65 | typedef struct BlkMigState { | |
c163b5ca | 66 | int blk_enable; |
67 | int shared_base; | |
5e5328be JK |
68 | QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
69 | QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; | |
c163b5ca | 70 | int submitted; |
71 | int read_done; | |
72 | int transferred; | |
82801d8f | 73 | int64_t total_sector_sum; |
01e61e2d | 74 | int prev_progress; |
c163b5ca | 75 | } BlkMigState; |
76 | ||
d11ecd3d | 77 | static BlkMigState block_mig_state; |
c163b5ca | 78 | |
13f0b67f JK |
79 | static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
80 | { | |
81 | int len; | |
82 | ||
83 | /* sector number and flags */ | |
84 | qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) | |
85 | | BLK_MIG_FLAG_DEVICE_BLOCK); | |
86 | ||
87 | /* device name */ | |
88 | len = strlen(blk->bmds->bs->device_name); | |
89 | qemu_put_byte(f, len); | |
90 | qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); | |
91 | ||
92 | qemu_put_buffer(f, blk->buf, BLOCK_SIZE); | |
93 | } | |
94 | ||
25f23643 JK |
95 | int blk_mig_active(void) |
96 | { | |
97 | return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list); | |
98 | } | |
99 | ||
100 | uint64_t blk_mig_bytes_transferred(void) | |
101 | { | |
102 | BlkMigDevState *bmds; | |
103 | uint64_t sum = 0; | |
104 | ||
105 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
106 | sum += bmds->completed_sectors; | |
107 | } | |
108 | return sum << BDRV_SECTOR_BITS; | |
109 | } | |
110 | ||
111 | uint64_t blk_mig_bytes_remaining(void) | |
112 | { | |
113 | return blk_mig_bytes_total() - blk_mig_bytes_transferred(); | |
114 | } | |
115 | ||
116 | uint64_t blk_mig_bytes_total(void) | |
117 | { | |
118 | BlkMigDevState *bmds; | |
119 | uint64_t sum = 0; | |
120 | ||
121 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
122 | sum += bmds->total_sectors; | |
123 | } | |
124 | return sum << BDRV_SECTOR_BITS; | |
125 | } | |
126 | ||
c163b5ca | 127 | static void blk_mig_read_cb(void *opaque, int ret) |
128 | { | |
129 | BlkMigBlock *blk = opaque; | |
a55eb92c | 130 | |
c163b5ca | 131 | blk->ret = ret; |
a55eb92c | 132 | |
5e5328be | 133 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
a55eb92c | 134 | |
d11ecd3d JK |
135 | block_mig_state.submitted--; |
136 | block_mig_state.read_done++; | |
137 | assert(block_mig_state.submitted >= 0); | |
c163b5ca | 138 | } |
139 | ||
7184049e JK |
140 | static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
141 | BlkMigDevState *bmds, int is_async) | |
a55eb92c | 142 | { |
57cce12d JK |
143 | int64_t total_sectors = bmds->total_sectors; |
144 | int64_t cur_sector = bmds->cur_sector; | |
145 | BlockDriverState *bs = bmds->bs; | |
c163b5ca | 146 | BlkMigBlock *blk; |
13f0b67f | 147 | int nr_sectors; |
a55eb92c | 148 | |
57cce12d | 149 | if (bmds->shared_base) { |
b1d10856 | 150 | while (cur_sector < total_sectors && |
57cce12d JK |
151 | !bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
152 | &nr_sectors)) { | |
c163b5ca | 153 | cur_sector += nr_sectors; |
154 | } | |
155 | } | |
a55eb92c JK |
156 | |
157 | if (cur_sector >= total_sectors) { | |
82801d8f | 158 | bmds->cur_sector = bmds->completed_sectors = total_sectors; |
c163b5ca | 159 | return 1; |
160 | } | |
a55eb92c | 161 | |
82801d8f | 162 | bmds->completed_sectors = cur_sector; |
a55eb92c | 163 | |
57cce12d JK |
164 | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1); |
165 | ||
6ea44308 JK |
166 | /* we are going to transfer a full block even if it is not allocated */ |
167 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
c163b5ca | 168 | |
6ea44308 | 169 | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
57cce12d | 170 | nr_sectors = total_sectors - cur_sector; |
c163b5ca | 171 | } |
a55eb92c | 172 | |
13f0b67f JK |
173 | blk = qemu_malloc(sizeof(BlkMigBlock)); |
174 | blk->buf = qemu_malloc(BLOCK_SIZE); | |
175 | blk->bmds = bmds; | |
176 | blk->sector = cur_sector; | |
a55eb92c | 177 | |
13f0b67f | 178 | if (is_async) { |
57cce12d JK |
179 | blk->iov.iov_base = blk->buf; |
180 | blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; | |
181 | qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); | |
a55eb92c | 182 | |
57cce12d JK |
183 | blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
184 | nr_sectors, blk_mig_read_cb, blk); | |
57cce12d | 185 | if (!blk->aiocb) { |
4b640365 | 186 | goto error; |
57cce12d | 187 | } |
57cce12d | 188 | block_mig_state.submitted++; |
57cce12d | 189 | } else { |
13f0b67f | 190 | if (bdrv_read(bs, cur_sector, blk->buf, nr_sectors) < 0) { |
4b640365 | 191 | goto error; |
c163b5ca | 192 | } |
13f0b67f | 193 | blk_send(f, blk); |
a55eb92c | 194 | |
13f0b67f JK |
195 | qemu_free(blk->buf); |
196 | qemu_free(blk); | |
c163b5ca | 197 | } |
198 | ||
13f0b67f JK |
199 | bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
200 | bmds->cur_sector = cur_sector + nr_sectors; | |
a55eb92c | 201 | |
13f0b67f | 202 | return (bmds->cur_sector >= total_sectors); |
4b640365 JK |
203 | |
204 | error: | |
7184049e | 205 | monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); |
4b640365 JK |
206 | qemu_file_set_error(f); |
207 | qemu_free(blk->buf); | |
208 | qemu_free(blk); | |
209 | return 0; | |
c163b5ca | 210 | } |
211 | ||
c163b5ca | 212 | static void set_dirty_tracking(int enable) |
213 | { | |
214 | BlkMigDevState *bmds; | |
5e5328be JK |
215 | |
216 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
a55eb92c | 217 | bdrv_set_dirty_tracking(bmds->bs, enable); |
c163b5ca | 218 | } |
c163b5ca | 219 | } |
220 | ||
7184049e | 221 | static void init_blk_migration(Monitor *mon, QEMUFile *f) |
c163b5ca | 222 | { |
5e5328be | 223 | BlkMigDevState *bmds; |
c163b5ca | 224 | BlockDriverState *bs; |
792773b2 | 225 | int64_t sectors; |
a55eb92c | 226 | |
69d63a97 JK |
227 | block_mig_state.submitted = 0; |
228 | block_mig_state.read_done = 0; | |
229 | block_mig_state.transferred = 0; | |
82801d8f | 230 | block_mig_state.total_sector_sum = 0; |
01e61e2d | 231 | block_mig_state.prev_progress = -1; |
69d63a97 | 232 | |
c163b5ca | 233 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
a55eb92c | 234 | if (bs->type == BDRV_TYPE_HD) { |
792773b2 JK |
235 | sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
236 | if (sectors == 0) { | |
237 | continue; | |
238 | } | |
239 | ||
c163b5ca | 240 | bmds = qemu_mallocz(sizeof(BlkMigDevState)); |
241 | bmds->bs = bs; | |
242 | bmds->bulk_completed = 0; | |
792773b2 | 243 | bmds->total_sectors = sectors; |
82801d8f | 244 | bmds->completed_sectors = 0; |
d11ecd3d | 245 | bmds->shared_base = block_mig_state.shared_base; |
a55eb92c | 246 | |
792773b2 | 247 | block_mig_state.total_sector_sum += sectors; |
82801d8f | 248 | |
a55eb92c | 249 | if (bmds->shared_base) { |
7184049e JK |
250 | monitor_printf(mon, "Start migration for %s with shared base " |
251 | "image\n", | |
252 | bs->device_name); | |
c163b5ca | 253 | } else { |
7184049e JK |
254 | monitor_printf(mon, "Start full migration for %s\n", |
255 | bs->device_name); | |
c163b5ca | 256 | } |
a55eb92c | 257 | |
5e5328be | 258 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
c163b5ca | 259 | } |
a55eb92c | 260 | } |
c163b5ca | 261 | } |
262 | ||
7184049e | 263 | static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f, int is_async) |
c163b5ca | 264 | { |
82801d8f | 265 | int64_t completed_sector_sum = 0; |
c163b5ca | 266 | BlkMigDevState *bmds; |
01e61e2d | 267 | int progress; |
82801d8f | 268 | int ret = 0; |
c163b5ca | 269 | |
5e5328be | 270 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
a55eb92c | 271 | if (bmds->bulk_completed == 0) { |
7184049e | 272 | if (mig_save_device_bulk(mon, f, bmds, is_async) == 1) { |
57cce12d JK |
273 | /* completed bulk section for this device */ |
274 | bmds->bulk_completed = 1; | |
c163b5ca | 275 | } |
82801d8f JK |
276 | completed_sector_sum += bmds->completed_sectors; |
277 | ret = 1; | |
278 | break; | |
279 | } else { | |
280 | completed_sector_sum += bmds->completed_sectors; | |
c163b5ca | 281 | } |
282 | } | |
a55eb92c | 283 | |
01e61e2d JK |
284 | progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum; |
285 | if (progress != block_mig_state.prev_progress) { | |
286 | block_mig_state.prev_progress = progress; | |
287 | qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) | |
288 | | BLK_MIG_FLAG_PROGRESS); | |
289 | monitor_printf(mon, "Completed %d %%\r", progress); | |
7184049e | 290 | monitor_flush(mon); |
82801d8f JK |
291 | } |
292 | ||
293 | return ret; | |
c163b5ca | 294 | } |
295 | ||
296 | #define MAX_NUM_BLOCKS 4 | |
297 | ||
7184049e | 298 | static void blk_mig_save_dirty_blocks(Monitor *mon, QEMUFile *f) |
c163b5ca | 299 | { |
300 | BlkMigDevState *bmds; | |
13f0b67f | 301 | BlkMigBlock blk; |
c163b5ca | 302 | int64_t sector; |
a55eb92c | 303 | |
13f0b67f | 304 | blk.buf = qemu_malloc(BLOCK_SIZE); |
575a58d7 | 305 | |
5e5328be | 306 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
a55eb92c JK |
307 | for (sector = 0; sector < bmds->cur_sector;) { |
308 | if (bdrv_get_dirty(bmds->bs, sector)) { | |
13f0b67f | 309 | if (bdrv_read(bmds->bs, sector, blk.buf, |
6ea44308 | 310 | BDRV_SECTORS_PER_DIRTY_CHUNK) < 0) { |
7184049e JK |
311 | monitor_printf(mon, "Error reading sector %" PRId64 "\n", |
312 | sector); | |
4b640365 JK |
313 | qemu_file_set_error(f); |
314 | qemu_free(blk.buf); | |
315 | return; | |
c163b5ca | 316 | } |
13f0b67f JK |
317 | blk.bmds = bmds; |
318 | blk.sector = sector; | |
319 | blk_send(f, &blk); | |
a55eb92c JK |
320 | |
321 | bdrv_reset_dirty(bmds->bs, sector, | |
6ea44308 | 322 | BDRV_SECTORS_PER_DIRTY_CHUNK); |
a55eb92c | 323 | } |
6ea44308 | 324 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
c163b5ca | 325 | } |
326 | } | |
575a58d7 | 327 | |
13f0b67f | 328 | qemu_free(blk.buf); |
c163b5ca | 329 | } |
330 | ||
331 | static void flush_blks(QEMUFile* f) | |
332 | { | |
5e5328be | 333 | BlkMigBlock *blk; |
a55eb92c | 334 | |
d11ecd3d JK |
335 | dprintf("%s Enter submitted %d read_done %d transferred %d\n", |
336 | __FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, | |
337 | block_mig_state.transferred); | |
a55eb92c | 338 | |
5e5328be JK |
339 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
340 | if (qemu_file_rate_limit(f)) { | |
341 | break; | |
342 | } | |
4b640365 JK |
343 | if (blk->ret < 0) { |
344 | qemu_file_set_error(f); | |
345 | break; | |
346 | } | |
13f0b67f | 347 | blk_send(f, blk); |
a55eb92c | 348 | |
5e5328be | 349 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
c163b5ca | 350 | qemu_free(blk->buf); |
351 | qemu_free(blk); | |
a55eb92c | 352 | |
d11ecd3d JK |
353 | block_mig_state.read_done--; |
354 | block_mig_state.transferred++; | |
355 | assert(block_mig_state.read_done >= 0); | |
c163b5ca | 356 | } |
c163b5ca | 357 | |
d11ecd3d JK |
358 | dprintf("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__, |
359 | block_mig_state.submitted, block_mig_state.read_done, | |
360 | block_mig_state.transferred); | |
c163b5ca | 361 | } |
362 | ||
363 | static int is_stage2_completed(void) | |
364 | { | |
365 | BlkMigDevState *bmds; | |
a55eb92c | 366 | |
d11ecd3d | 367 | if (block_mig_state.submitted > 0) { |
c163b5ca | 368 | return 0; |
369 | } | |
a55eb92c | 370 | |
5e5328be | 371 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
a55eb92c | 372 | if (bmds->bulk_completed == 0) { |
c163b5ca | 373 | return 0; |
374 | } | |
375 | } | |
a55eb92c | 376 | |
c163b5ca | 377 | return 1; |
378 | } | |
379 | ||
7184049e | 380 | static void blk_mig_cleanup(Monitor *mon) |
4ec7fcc7 | 381 | { |
82801d8f JK |
382 | BlkMigDevState *bmds; |
383 | BlkMigBlock *blk; | |
4ec7fcc7 | 384 | |
82801d8f JK |
385 | while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
386 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); | |
4ec7fcc7 JK |
387 | qemu_free(bmds); |
388 | } | |
389 | ||
82801d8f JK |
390 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
391 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); | |
4ec7fcc7 JK |
392 | qemu_free(blk->buf); |
393 | qemu_free(blk); | |
394 | } | |
395 | ||
396 | set_dirty_tracking(0); | |
397 | ||
7184049e | 398 | monitor_printf(mon, "\n"); |
4ec7fcc7 JK |
399 | } |
400 | ||
f327aa0c | 401 | static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
c163b5ca | 402 | { |
d11ecd3d JK |
403 | dprintf("Enter save live stage %d submitted %d transferred %d\n", |
404 | stage, block_mig_state.submitted, block_mig_state.transferred); | |
a55eb92c | 405 | |
4ec7fcc7 | 406 | if (stage < 0) { |
7184049e | 407 | blk_mig_cleanup(mon); |
4ec7fcc7 JK |
408 | return 0; |
409 | } | |
410 | ||
d11ecd3d | 411 | if (block_mig_state.blk_enable != 1) { |
c163b5ca | 412 | /* no need to migrate storage */ |
a55eb92c | 413 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
c163b5ca | 414 | return 1; |
415 | } | |
a55eb92c JK |
416 | |
417 | if (stage == 1) { | |
7184049e | 418 | init_blk_migration(mon, f); |
a55eb92c | 419 | |
c163b5ca | 420 | /* start track dirty blocks */ |
421 | set_dirty_tracking(1); | |
c163b5ca | 422 | } |
423 | ||
424 | flush_blks(f); | |
a55eb92c | 425 | |
4b640365 | 426 | if (qemu_file_has_error(f)) { |
7184049e | 427 | blk_mig_cleanup(mon); |
4b640365 JK |
428 | return 0; |
429 | } | |
430 | ||
c163b5ca | 431 | /* control the rate of transfer */ |
d11ecd3d JK |
432 | while ((block_mig_state.submitted + |
433 | block_mig_state.read_done) * BLOCK_SIZE < | |
a55eb92c | 434 | qemu_file_get_rate_limit(f)) { |
7184049e | 435 | if (blk_mig_save_bulked_block(mon, f, 1) == 0) { |
a55eb92c | 436 | /* no more bulk blocks for now */ |
c163b5ca | 437 | break; |
a55eb92c | 438 | } |
c163b5ca | 439 | } |
a55eb92c | 440 | |
c163b5ca | 441 | flush_blks(f); |
a55eb92c | 442 | |
4b640365 | 443 | if (qemu_file_has_error(f)) { |
7184049e | 444 | blk_mig_cleanup(mon); |
4b640365 JK |
445 | return 0; |
446 | } | |
447 | ||
a55eb92c | 448 | if (stage == 3) { |
7184049e | 449 | while (blk_mig_save_bulked_block(mon, f, 0) != 0) { |
a55eb92c JK |
450 | /* empty */ |
451 | } | |
452 | ||
7184049e JK |
453 | blk_mig_save_dirty_blocks(mon, f); |
454 | blk_mig_cleanup(mon); | |
a55eb92c | 455 | |
01e61e2d JK |
456 | /* report completion */ |
457 | qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS); | |
458 | ||
4b640365 JK |
459 | if (qemu_file_has_error(f)) { |
460 | return 0; | |
461 | } | |
462 | ||
7184049e | 463 | monitor_printf(mon, "Block migration completed\n"); |
c163b5ca | 464 | } |
a55eb92c JK |
465 | |
466 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); | |
467 | ||
c163b5ca | 468 | return ((stage == 2) && is_stage2_completed()); |
469 | } | |
470 | ||
471 | static int block_load(QEMUFile *f, void *opaque, int version_id) | |
472 | { | |
01e61e2d | 473 | static int banner_printed; |
c163b5ca | 474 | int len, flags; |
475 | char device_name[256]; | |
476 | int64_t addr; | |
477 | BlockDriverState *bs; | |
478 | uint8_t *buf; | |
a55eb92c | 479 | |
c163b5ca | 480 | do { |
c163b5ca | 481 | addr = qemu_get_be64(f); |
a55eb92c | 482 | |
6ea44308 JK |
483 | flags = addr & ~BDRV_SECTOR_MASK; |
484 | addr >>= BDRV_SECTOR_BITS; | |
a55eb92c JK |
485 | |
486 | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { | |
c163b5ca | 487 | /* get device name */ |
488 | len = qemu_get_byte(f); | |
c163b5ca | 489 | qemu_get_buffer(f, (uint8_t *)device_name, len); |
490 | device_name[len] = '\0'; | |
a55eb92c | 491 | |
c163b5ca | 492 | bs = bdrv_find(device_name); |
4b640365 JK |
493 | if (!bs) { |
494 | fprintf(stderr, "Error unknown block device %s\n", | |
495 | device_name); | |
496 | return -EINVAL; | |
497 | } | |
a55eb92c | 498 | |
575a58d7 JK |
499 | buf = qemu_malloc(BLOCK_SIZE); |
500 | ||
a55eb92c | 501 | qemu_get_buffer(f, buf, BLOCK_SIZE); |
4b640365 | 502 | bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); |
575a58d7 JK |
503 | |
504 | qemu_free(buf); | |
01e61e2d JK |
505 | } else if (flags & BLK_MIG_FLAG_PROGRESS) { |
506 | if (!banner_printed) { | |
507 | printf("Receiving block device images\n"); | |
508 | banner_printed = 1; | |
509 | } | |
510 | printf("Completed %d %%%c", (int)addr, | |
511 | (addr == 100) ? '\n' : '\r'); | |
512 | fflush(stdout); | |
a55eb92c | 513 | } else if (!(flags & BLK_MIG_FLAG_EOS)) { |
4b640365 JK |
514 | fprintf(stderr, "Unknown flags\n"); |
515 | return -EINVAL; | |
516 | } | |
517 | if (qemu_file_has_error(f)) { | |
518 | return -EIO; | |
c163b5ca | 519 | } |
a55eb92c JK |
520 | } while (!(flags & BLK_MIG_FLAG_EOS)); |
521 | ||
c163b5ca | 522 | return 0; |
523 | } | |
524 | ||
525 | static void block_set_params(int blk_enable, int shared_base, void *opaque) | |
526 | { | |
d11ecd3d JK |
527 | block_mig_state.blk_enable = blk_enable; |
528 | block_mig_state.shared_base = shared_base; | |
a55eb92c | 529 | |
c163b5ca | 530 | /* shared base means that blk_enable = 1 */ |
d11ecd3d | 531 | block_mig_state.blk_enable |= shared_base; |
c163b5ca | 532 | } |
533 | ||
c163b5ca | 534 | void blk_mig_init(void) |
a55eb92c | 535 | { |
5e5328be JK |
536 | QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
537 | QSIMPLEQ_INIT(&block_mig_state.blk_list); | |
538 | ||
a55eb92c | 539 | register_savevm_live("block", 0, 1, block_set_params, block_save_live, |
d11ecd3d | 540 | NULL, block_load, &block_mig_state); |
c163b5ca | 541 | } |