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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 "qemu-queue.h" | |
18 | #include "qemu-timer.h" | |
19 | #include "monitor.h" | |
20 | #include "block-migration.h" | |
21 | #include "migration.h" | |
22 | #include "blockdev.h" | |
23 | #include <assert.h> | |
24 | ||
25 | #define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS) | |
26 | ||
27 | #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 | |
28 | #define BLK_MIG_FLAG_EOS 0x02 | |
29 | #define BLK_MIG_FLAG_PROGRESS 0x04 | |
30 | ||
31 | #define MAX_IS_ALLOCATED_SEARCH 65536 | |
32 | ||
33 | //#define DEBUG_BLK_MIGRATION | |
34 | ||
35 | #ifdef DEBUG_BLK_MIGRATION | |
36 | #define DPRINTF(fmt, ...) \ | |
37 | do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) | |
38 | #else | |
39 | #define DPRINTF(fmt, ...) \ | |
40 | do { } while (0) | |
41 | #endif | |
42 | ||
43 | typedef struct BlkMigDevState { | |
44 | BlockDriverState *bs; | |
45 | int bulk_completed; | |
46 | int shared_base; | |
47 | int64_t cur_sector; | |
48 | int64_t cur_dirty; | |
49 | int64_t completed_sectors; | |
50 | int64_t total_sectors; | |
51 | int64_t dirty; | |
52 | QSIMPLEQ_ENTRY(BlkMigDevState) entry; | |
53 | unsigned long *aio_bitmap; | |
54 | } BlkMigDevState; | |
55 | ||
56 | typedef struct BlkMigBlock { | |
57 | uint8_t *buf; | |
58 | BlkMigDevState *bmds; | |
59 | int64_t sector; | |
60 | int nr_sectors; | |
61 | struct iovec iov; | |
62 | QEMUIOVector qiov; | |
63 | BlockDriverAIOCB *aiocb; | |
64 | int ret; | |
65 | QSIMPLEQ_ENTRY(BlkMigBlock) entry; | |
66 | } BlkMigBlock; | |
67 | ||
68 | typedef struct BlkMigState { | |
69 | int blk_enable; | |
70 | int shared_base; | |
71 | QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; | |
72 | QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; | |
73 | int submitted; | |
74 | int read_done; | |
75 | int transferred; | |
76 | int64_t total_sector_sum; | |
77 | int prev_progress; | |
78 | int bulk_completed; | |
79 | long double total_time; | |
80 | long double prev_time_offset; | |
81 | int reads; | |
82 | } BlkMigState; | |
83 | ||
84 | static BlkMigState block_mig_state; | |
85 | ||
86 | static void blk_send(QEMUFile *f, BlkMigBlock * blk) | |
87 | { | |
88 | int len; | |
89 | ||
90 | /* sector number and flags */ | |
91 | qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) | |
92 | | BLK_MIG_FLAG_DEVICE_BLOCK); | |
93 | ||
94 | /* device name */ | |
95 | len = strlen(blk->bmds->bs->device_name); | |
96 | qemu_put_byte(f, len); | |
97 | qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); | |
98 | ||
99 | qemu_put_buffer(f, blk->buf, BLOCK_SIZE); | |
100 | } | |
101 | ||
102 | int blk_mig_active(void) | |
103 | { | |
104 | return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list); | |
105 | } | |
106 | ||
107 | uint64_t blk_mig_bytes_transferred(void) | |
108 | { | |
109 | BlkMigDevState *bmds; | |
110 | uint64_t sum = 0; | |
111 | ||
112 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
113 | sum += bmds->completed_sectors; | |
114 | } | |
115 | return sum << BDRV_SECTOR_BITS; | |
116 | } | |
117 | ||
118 | uint64_t blk_mig_bytes_remaining(void) | |
119 | { | |
120 | return blk_mig_bytes_total() - blk_mig_bytes_transferred(); | |
121 | } | |
122 | ||
123 | uint64_t blk_mig_bytes_total(void) | |
124 | { | |
125 | BlkMigDevState *bmds; | |
126 | uint64_t sum = 0; | |
127 | ||
128 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
129 | sum += bmds->total_sectors; | |
130 | } | |
131 | return sum << BDRV_SECTOR_BITS; | |
132 | } | |
133 | ||
134 | static inline long double compute_read_bwidth(void) | |
135 | { | |
136 | assert(block_mig_state.total_time != 0); | |
137 | return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE; | |
138 | } | |
139 | ||
140 | static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector) | |
141 | { | |
142 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
143 | ||
144 | if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) { | |
145 | return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
146 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
147 | } else { | |
148 | return 0; | |
149 | } | |
150 | } | |
151 | ||
152 | static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num, | |
153 | int nb_sectors, int set) | |
154 | { | |
155 | int64_t start, end; | |
156 | unsigned long val, idx, bit; | |
157 | ||
158 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
159 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
160 | ||
161 | for (; start <= end; start++) { | |
162 | idx = start / (sizeof(unsigned long) * 8); | |
163 | bit = start % (sizeof(unsigned long) * 8); | |
164 | val = bmds->aio_bitmap[idx]; | |
165 | if (set) { | |
166 | val |= 1UL << bit; | |
167 | } else { | |
168 | val &= ~(1UL << bit); | |
169 | } | |
170 | bmds->aio_bitmap[idx] = val; | |
171 | } | |
172 | } | |
173 | ||
174 | static void alloc_aio_bitmap(BlkMigDevState *bmds) | |
175 | { | |
176 | BlockDriverState *bs = bmds->bs; | |
177 | int64_t bitmap_size; | |
178 | ||
179 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
180 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
181 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
182 | ||
183 | bmds->aio_bitmap = qemu_mallocz(bitmap_size); | |
184 | } | |
185 | ||
186 | static void blk_mig_read_cb(void *opaque, int ret) | |
187 | { | |
188 | long double curr_time = qemu_get_clock_ns(rt_clock); | |
189 | BlkMigBlock *blk = opaque; | |
190 | ||
191 | blk->ret = ret; | |
192 | ||
193 | block_mig_state.reads++; | |
194 | block_mig_state.total_time += (curr_time - block_mig_state.prev_time_offset); | |
195 | block_mig_state.prev_time_offset = curr_time; | |
196 | ||
197 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); | |
198 | bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0); | |
199 | ||
200 | block_mig_state.submitted--; | |
201 | block_mig_state.read_done++; | |
202 | assert(block_mig_state.submitted >= 0); | |
203 | } | |
204 | ||
205 | static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, | |
206 | BlkMigDevState *bmds) | |
207 | { | |
208 | int64_t total_sectors = bmds->total_sectors; | |
209 | int64_t cur_sector = bmds->cur_sector; | |
210 | BlockDriverState *bs = bmds->bs; | |
211 | BlkMigBlock *blk; | |
212 | int nr_sectors; | |
213 | ||
214 | if (bmds->shared_base) { | |
215 | while (cur_sector < total_sectors && | |
216 | !bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, | |
217 | &nr_sectors)) { | |
218 | cur_sector += nr_sectors; | |
219 | } | |
220 | } | |
221 | ||
222 | if (cur_sector >= total_sectors) { | |
223 | bmds->cur_sector = bmds->completed_sectors = total_sectors; | |
224 | return 1; | |
225 | } | |
226 | ||
227 | bmds->completed_sectors = cur_sector; | |
228 | ||
229 | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1); | |
230 | ||
231 | /* we are going to transfer a full block even if it is not allocated */ | |
232 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
233 | ||
234 | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { | |
235 | nr_sectors = total_sectors - cur_sector; | |
236 | } | |
237 | ||
238 | blk = qemu_malloc(sizeof(BlkMigBlock)); | |
239 | blk->buf = qemu_malloc(BLOCK_SIZE); | |
240 | blk->bmds = bmds; | |
241 | blk->sector = cur_sector; | |
242 | blk->nr_sectors = nr_sectors; | |
243 | ||
244 | blk->iov.iov_base = blk->buf; | |
245 | blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; | |
246 | qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); | |
247 | ||
248 | if (block_mig_state.submitted == 0) { | |
249 | block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); | |
250 | } | |
251 | ||
252 | blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, | |
253 | nr_sectors, blk_mig_read_cb, blk); | |
254 | if (!blk->aiocb) { | |
255 | goto error; | |
256 | } | |
257 | block_mig_state.submitted++; | |
258 | ||
259 | bdrv_reset_dirty(bs, cur_sector, nr_sectors); | |
260 | bmds->cur_sector = cur_sector + nr_sectors; | |
261 | ||
262 | return (bmds->cur_sector >= total_sectors); | |
263 | ||
264 | error: | |
265 | monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); | |
266 | qemu_file_set_error(f); | |
267 | qemu_free(blk->buf); | |
268 | qemu_free(blk); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static void set_dirty_tracking(int enable) | |
273 | { | |
274 | BlkMigDevState *bmds; | |
275 | ||
276 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
277 | bdrv_set_dirty_tracking(bmds->bs, enable); | |
278 | } | |
279 | } | |
280 | ||
281 | static void init_blk_migration_it(void *opaque, BlockDriverState *bs) | |
282 | { | |
283 | Monitor *mon = opaque; | |
284 | BlkMigDevState *bmds; | |
285 | int64_t sectors; | |
286 | ||
287 | if (!bdrv_is_read_only(bs)) { | |
288 | sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
289 | if (sectors <= 0) { | |
290 | return; | |
291 | } | |
292 | ||
293 | bmds = qemu_mallocz(sizeof(BlkMigDevState)); | |
294 | bmds->bs = bs; | |
295 | bmds->bulk_completed = 0; | |
296 | bmds->total_sectors = sectors; | |
297 | bmds->completed_sectors = 0; | |
298 | bmds->shared_base = block_mig_state.shared_base; | |
299 | alloc_aio_bitmap(bmds); | |
300 | drive_get_ref(drive_get_by_blockdev(bs)); | |
301 | bdrv_set_in_use(bs, 1); | |
302 | ||
303 | block_mig_state.total_sector_sum += sectors; | |
304 | ||
305 | if (bmds->shared_base) { | |
306 | monitor_printf(mon, "Start migration for %s with shared base " | |
307 | "image\n", | |
308 | bs->device_name); | |
309 | } else { | |
310 | monitor_printf(mon, "Start full migration for %s\n", | |
311 | bs->device_name); | |
312 | } | |
313 | ||
314 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); | |
315 | } | |
316 | } | |
317 | ||
318 | static void init_blk_migration(Monitor *mon, QEMUFile *f) | |
319 | { | |
320 | block_mig_state.submitted = 0; | |
321 | block_mig_state.read_done = 0; | |
322 | block_mig_state.transferred = 0; | |
323 | block_mig_state.total_sector_sum = 0; | |
324 | block_mig_state.prev_progress = -1; | |
325 | block_mig_state.bulk_completed = 0; | |
326 | block_mig_state.total_time = 0; | |
327 | block_mig_state.reads = 0; | |
328 | ||
329 | bdrv_iterate(init_blk_migration_it, mon); | |
330 | } | |
331 | ||
332 | static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) | |
333 | { | |
334 | int64_t completed_sector_sum = 0; | |
335 | BlkMigDevState *bmds; | |
336 | int progress; | |
337 | int ret = 0; | |
338 | ||
339 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
340 | if (bmds->bulk_completed == 0) { | |
341 | if (mig_save_device_bulk(mon, f, bmds) == 1) { | |
342 | /* completed bulk section for this device */ | |
343 | bmds->bulk_completed = 1; | |
344 | } | |
345 | completed_sector_sum += bmds->completed_sectors; | |
346 | ret = 1; | |
347 | break; | |
348 | } else { | |
349 | completed_sector_sum += bmds->completed_sectors; | |
350 | } | |
351 | } | |
352 | ||
353 | if (block_mig_state.total_sector_sum != 0) { | |
354 | progress = completed_sector_sum * 100 / | |
355 | block_mig_state.total_sector_sum; | |
356 | } else { | |
357 | progress = 100; | |
358 | } | |
359 | if (progress != block_mig_state.prev_progress) { | |
360 | block_mig_state.prev_progress = progress; | |
361 | qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) | |
362 | | BLK_MIG_FLAG_PROGRESS); | |
363 | monitor_printf(mon, "Completed %d %%\r", progress); | |
364 | monitor_flush(mon); | |
365 | } | |
366 | ||
367 | return ret; | |
368 | } | |
369 | ||
370 | static void blk_mig_reset_dirty_cursor(void) | |
371 | { | |
372 | BlkMigDevState *bmds; | |
373 | ||
374 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
375 | bmds->cur_dirty = 0; | |
376 | } | |
377 | } | |
378 | ||
379 | static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, | |
380 | BlkMigDevState *bmds, int is_async) | |
381 | { | |
382 | BlkMigBlock *blk; | |
383 | int64_t total_sectors = bmds->total_sectors; | |
384 | int64_t sector; | |
385 | int nr_sectors; | |
386 | ||
387 | for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) { | |
388 | if (bmds_aio_inflight(bmds, sector)) { | |
389 | qemu_aio_flush(); | |
390 | } | |
391 | if (bdrv_get_dirty(bmds->bs, sector)) { | |
392 | ||
393 | if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { | |
394 | nr_sectors = total_sectors - sector; | |
395 | } else { | |
396 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
397 | } | |
398 | blk = qemu_malloc(sizeof(BlkMigBlock)); | |
399 | blk->buf = qemu_malloc(BLOCK_SIZE); | |
400 | blk->bmds = bmds; | |
401 | blk->sector = sector; | |
402 | blk->nr_sectors = nr_sectors; | |
403 | ||
404 | if (is_async) { | |
405 | blk->iov.iov_base = blk->buf; | |
406 | blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; | |
407 | qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); | |
408 | ||
409 | if (block_mig_state.submitted == 0) { | |
410 | block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); | |
411 | } | |
412 | ||
413 | blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, | |
414 | nr_sectors, blk_mig_read_cb, blk); | |
415 | if (!blk->aiocb) { | |
416 | goto error; | |
417 | } | |
418 | block_mig_state.submitted++; | |
419 | bmds_set_aio_inflight(bmds, sector, nr_sectors, 1); | |
420 | } else { | |
421 | if (bdrv_read(bmds->bs, sector, blk->buf, | |
422 | nr_sectors) < 0) { | |
423 | goto error; | |
424 | } | |
425 | blk_send(f, blk); | |
426 | ||
427 | qemu_free(blk->buf); | |
428 | qemu_free(blk); | |
429 | } | |
430 | ||
431 | bdrv_reset_dirty(bmds->bs, sector, nr_sectors); | |
432 | break; | |
433 | } | |
434 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; | |
435 | bmds->cur_dirty = sector; | |
436 | } | |
437 | ||
438 | return (bmds->cur_dirty >= bmds->total_sectors); | |
439 | ||
440 | error: | |
441 | monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector); | |
442 | qemu_file_set_error(f); | |
443 | qemu_free(blk->buf); | |
444 | qemu_free(blk); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async) | |
449 | { | |
450 | BlkMigDevState *bmds; | |
451 | int ret = 0; | |
452 | ||
453 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
454 | if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) { | |
455 | ret = 1; | |
456 | break; | |
457 | } | |
458 | } | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
463 | static void flush_blks(QEMUFile* f) | |
464 | { | |
465 | BlkMigBlock *blk; | |
466 | ||
467 | DPRINTF("%s Enter submitted %d read_done %d transferred %d\n", | |
468 | __FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, | |
469 | block_mig_state.transferred); | |
470 | ||
471 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { | |
472 | if (qemu_file_rate_limit(f)) { | |
473 | break; | |
474 | } | |
475 | if (blk->ret < 0) { | |
476 | qemu_file_set_error(f); | |
477 | break; | |
478 | } | |
479 | blk_send(f, blk); | |
480 | ||
481 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); | |
482 | qemu_free(blk->buf); | |
483 | qemu_free(blk); | |
484 | ||
485 | block_mig_state.read_done--; | |
486 | block_mig_state.transferred++; | |
487 | assert(block_mig_state.read_done >= 0); | |
488 | } | |
489 | ||
490 | DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__, | |
491 | block_mig_state.submitted, block_mig_state.read_done, | |
492 | block_mig_state.transferred); | |
493 | } | |
494 | ||
495 | static int64_t get_remaining_dirty(void) | |
496 | { | |
497 | BlkMigDevState *bmds; | |
498 | int64_t dirty = 0; | |
499 | ||
500 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
501 | dirty += bdrv_get_dirty_count(bmds->bs); | |
502 | } | |
503 | ||
504 | return dirty * BLOCK_SIZE; | |
505 | } | |
506 | ||
507 | static int is_stage2_completed(void) | |
508 | { | |
509 | int64_t remaining_dirty; | |
510 | long double bwidth; | |
511 | ||
512 | if (block_mig_state.bulk_completed == 1) { | |
513 | ||
514 | remaining_dirty = get_remaining_dirty(); | |
515 | if (remaining_dirty == 0) { | |
516 | return 1; | |
517 | } | |
518 | ||
519 | bwidth = compute_read_bwidth(); | |
520 | ||
521 | if ((remaining_dirty / bwidth) <= | |
522 | migrate_max_downtime()) { | |
523 | /* finish stage2 because we think that we can finish remaing work | |
524 | below max_downtime */ | |
525 | ||
526 | return 1; | |
527 | } | |
528 | } | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static void blk_mig_cleanup(Monitor *mon) | |
534 | { | |
535 | BlkMigDevState *bmds; | |
536 | BlkMigBlock *blk; | |
537 | ||
538 | set_dirty_tracking(0); | |
539 | ||
540 | while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { | |
541 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); | |
542 | bdrv_set_in_use(bmds->bs, 0); | |
543 | drive_put_ref(drive_get_by_blockdev(bmds->bs)); | |
544 | qemu_free(bmds->aio_bitmap); | |
545 | qemu_free(bmds); | |
546 | } | |
547 | ||
548 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { | |
549 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); | |
550 | qemu_free(blk->buf); | |
551 | qemu_free(blk); | |
552 | } | |
553 | ||
554 | monitor_printf(mon, "\n"); | |
555 | } | |
556 | ||
557 | static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) | |
558 | { | |
559 | DPRINTF("Enter save live stage %d submitted %d transferred %d\n", | |
560 | stage, block_mig_state.submitted, block_mig_state.transferred); | |
561 | ||
562 | if (stage < 0) { | |
563 | blk_mig_cleanup(mon); | |
564 | return 0; | |
565 | } | |
566 | ||
567 | if (block_mig_state.blk_enable != 1) { | |
568 | /* no need to migrate storage */ | |
569 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); | |
570 | return 1; | |
571 | } | |
572 | ||
573 | if (stage == 1) { | |
574 | init_blk_migration(mon, f); | |
575 | ||
576 | /* start track dirty blocks */ | |
577 | set_dirty_tracking(1); | |
578 | } | |
579 | ||
580 | flush_blks(f); | |
581 | ||
582 | if (qemu_file_has_error(f)) { | |
583 | blk_mig_cleanup(mon); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | blk_mig_reset_dirty_cursor(); | |
588 | ||
589 | if (stage == 2) { | |
590 | /* control the rate of transfer */ | |
591 | while ((block_mig_state.submitted + | |
592 | block_mig_state.read_done) * BLOCK_SIZE < | |
593 | qemu_file_get_rate_limit(f)) { | |
594 | if (block_mig_state.bulk_completed == 0) { | |
595 | /* first finish the bulk phase */ | |
596 | if (blk_mig_save_bulked_block(mon, f) == 0) { | |
597 | /* finished saving bulk on all devices */ | |
598 | block_mig_state.bulk_completed = 1; | |
599 | } | |
600 | } else { | |
601 | if (blk_mig_save_dirty_block(mon, f, 1) == 0) { | |
602 | /* no more dirty blocks */ | |
603 | break; | |
604 | } | |
605 | } | |
606 | } | |
607 | ||
608 | flush_blks(f); | |
609 | ||
610 | if (qemu_file_has_error(f)) { | |
611 | blk_mig_cleanup(mon); | |
612 | return 0; | |
613 | } | |
614 | } | |
615 | ||
616 | if (stage == 3) { | |
617 | /* we know for sure that save bulk is completed and | |
618 | all async read completed */ | |
619 | assert(block_mig_state.submitted == 0); | |
620 | ||
621 | while (blk_mig_save_dirty_block(mon, f, 0) != 0); | |
622 | blk_mig_cleanup(mon); | |
623 | ||
624 | /* report completion */ | |
625 | qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS); | |
626 | ||
627 | if (qemu_file_has_error(f)) { | |
628 | return 0; | |
629 | } | |
630 | ||
631 | monitor_printf(mon, "Block migration completed\n"); | |
632 | } | |
633 | ||
634 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); | |
635 | ||
636 | return ((stage == 2) && is_stage2_completed()); | |
637 | } | |
638 | ||
639 | static int block_load(QEMUFile *f, void *opaque, int version_id) | |
640 | { | |
641 | static int banner_printed; | |
642 | int len, flags; | |
643 | char device_name[256]; | |
644 | int64_t addr; | |
645 | BlockDriverState *bs, *bs_prev = NULL; | |
646 | uint8_t *buf; | |
647 | int64_t total_sectors = 0; | |
648 | int nr_sectors; | |
649 | ||
650 | do { | |
651 | addr = qemu_get_be64(f); | |
652 | ||
653 | flags = addr & ~BDRV_SECTOR_MASK; | |
654 | addr >>= BDRV_SECTOR_BITS; | |
655 | ||
656 | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { | |
657 | int ret; | |
658 | /* get device name */ | |
659 | len = qemu_get_byte(f); | |
660 | qemu_get_buffer(f, (uint8_t *)device_name, len); | |
661 | device_name[len] = '\0'; | |
662 | ||
663 | bs = bdrv_find(device_name); | |
664 | if (!bs) { | |
665 | fprintf(stderr, "Error unknown block device %s\n", | |
666 | device_name); | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | if (bs != bs_prev) { | |
671 | bs_prev = bs; | |
672 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
673 | if (total_sectors <= 0) { | |
674 | error_report("Error getting length of block device %s", | |
675 | device_name); | |
676 | return -EINVAL; | |
677 | } | |
678 | } | |
679 | ||
680 | if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) { | |
681 | nr_sectors = total_sectors - addr; | |
682 | } else { | |
683 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
684 | } | |
685 | ||
686 | buf = qemu_malloc(BLOCK_SIZE); | |
687 | ||
688 | qemu_get_buffer(f, buf, BLOCK_SIZE); | |
689 | ret = bdrv_write(bs, addr, buf, nr_sectors); | |
690 | ||
691 | qemu_free(buf); | |
692 | if (ret < 0) { | |
693 | return ret; | |
694 | } | |
695 | } else if (flags & BLK_MIG_FLAG_PROGRESS) { | |
696 | if (!banner_printed) { | |
697 | printf("Receiving block device images\n"); | |
698 | banner_printed = 1; | |
699 | } | |
700 | printf("Completed %d %%%c", (int)addr, | |
701 | (addr == 100) ? '\n' : '\r'); | |
702 | fflush(stdout); | |
703 | } else if (!(flags & BLK_MIG_FLAG_EOS)) { | |
704 | fprintf(stderr, "Unknown flags\n"); | |
705 | return -EINVAL; | |
706 | } | |
707 | if (qemu_file_has_error(f)) { | |
708 | return -EIO; | |
709 | } | |
710 | } while (!(flags & BLK_MIG_FLAG_EOS)); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static void block_set_params(int blk_enable, int shared_base, void *opaque) | |
716 | { | |
717 | block_mig_state.blk_enable = blk_enable; | |
718 | block_mig_state.shared_base = shared_base; | |
719 | ||
720 | /* shared base means that blk_enable = 1 */ | |
721 | block_mig_state.blk_enable |= shared_base; | |
722 | } | |
723 | ||
724 | void blk_mig_init(void) | |
725 | { | |
726 | QSIMPLEQ_INIT(&block_mig_state.bmds_list); | |
727 | QSIMPLEQ_INIT(&block_mig_state.blk_list); | |
728 | ||
729 | register_savevm_live(NULL, "block", 0, 1, block_set_params, | |
730 | block_save_live, NULL, block_load, &block_mig_state); | |
731 | } |