]>
Commit | Line | Data |
---|---|---|
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 | * | |
6b620ca3 PB |
12 | * Contributions after 2012-01-13 are licensed under the terms of the |
13 | * GNU GPL, version 2 or (at your option) any later version. | |
c163b5ca LS |
14 | */ |
15 | ||
1393a485 | 16 | #include "qemu/osdep.h" |
da34e65c | 17 | #include "qapi/error.h" |
bfb197e0 | 18 | #include "qemu/error-report.h" |
db725815 | 19 | #include "qemu/main-loop.h" |
f348b6d1 | 20 | #include "qemu/cutils.h" |
1de7afc9 | 21 | #include "qemu/queue.h" |
2c9e6fec | 22 | #include "block.h" |
e2c1c34f | 23 | #include "block/dirty-bitmap.h" |
2c9e6fec | 24 | #include "migration/misc.h" |
6666c96a | 25 | #include "migration.h" |
e1fde0e0 | 26 | #include "migration-stats.h" |
f2a8f0a6 | 27 | #include "migration/register.h" |
08a0aee1 | 28 | #include "qemu-file.h" |
987772d9 | 29 | #include "migration/vmstate.h" |
c9ebaf74 | 30 | #include "sysemu/block-backend.h" |
fe80c024 | 31 | #include "trace.h" |
1f0776f1 | 32 | #include "options.h" |
c163b5ca | 33 | |
4bcb7de0 | 34 | #define BLK_MIG_BLOCK_SIZE (1ULL << 20) |
a152bd00 | 35 | #define BDRV_SECTORS_PER_DIRTY_CHUNK (BLK_MIG_BLOCK_SIZE >> BDRV_SECTOR_BITS) |
c163b5ca LS |
36 | |
37 | #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 | |
38 | #define BLK_MIG_FLAG_EOS 0x02 | |
01e61e2d | 39 | #define BLK_MIG_FLAG_PROGRESS 0x04 |
323004a3 | 40 | #define BLK_MIG_FLAG_ZERO_BLOCK 0x08 |
c163b5ca | 41 | |
d6a644bb | 42 | #define MAX_IS_ALLOCATED_SEARCH (65536 * BDRV_SECTOR_SIZE) |
c163b5ca | 43 | |
ef9c5160 | 44 | #define MAX_IO_BUFFERS 512 |
44815334 | 45 | #define MAX_PARALLEL_IO 16 |
f77dcdbc | 46 | |
a55eb92c | 47 | typedef struct BlkMigDevState { |
323920c4 | 48 | /* Written during setup phase. Can be read without a lock. */ |
ebd2f9e7 KW |
49 | BlockBackend *blk; |
50 | char *blk_name; | |
a55eb92c | 51 | int shared_base; |
a55eb92c | 52 | int64_t total_sectors; |
5e5328be | 53 | QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
ef0716df | 54 | Error *blocker; |
323920c4 PB |
55 | |
56 | /* Only used by migration thread. Does not need a lock. */ | |
57 | int bulk_completed; | |
58 | int64_t cur_sector; | |
59 | int64_t cur_dirty; | |
60 | ||
ef0716df PB |
61 | /* Data in the aio_bitmap is protected by block migration lock. |
62 | * Allocation and free happen during setup and cleanup respectively. | |
63 | */ | |
33656af7 | 64 | unsigned long *aio_bitmap; |
ef0716df PB |
65 | |
66 | /* Protected by block migration lock. */ | |
323920c4 | 67 | int64_t completed_sectors; |
ef0716df | 68 | |
b49f4755 | 69 | /* During migration this is protected by bdrv_dirty_bitmap_lock(). |
ef0716df PB |
70 | * Allocation and free happen during setup and cleanup respectively. |
71 | */ | |
e4654d2d | 72 | BdrvDirtyBitmap *dirty_bitmap; |
a55eb92c JK |
73 | } BlkMigDevState; |
74 | ||
c163b5ca | 75 | typedef struct BlkMigBlock { |
323920c4 | 76 | /* Only used by migration thread. */ |
c163b5ca LS |
77 | uint8_t *buf; |
78 | BlkMigDevState *bmds; | |
79 | int64_t sector; | |
33656af7 | 80 | int nr_sectors; |
c163b5ca | 81 | QEMUIOVector qiov; |
7c84b1b8 | 82 | BlockAIOCB *aiocb; |
323920c4 | 83 | |
52e850de | 84 | /* Protected by block migration lock. */ |
c163b5ca | 85 | int ret; |
5e5328be | 86 | QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
c163b5ca LS |
87 | } BlkMigBlock; |
88 | ||
89 | typedef struct BlkMigState { | |
b58deb34 | 90 | QSIMPLEQ_HEAD(, BlkMigDevState) bmds_list; |
323920c4 | 91 | int64_t total_sector_sum; |
323004a3 | 92 | bool zero_blocks; |
323920c4 | 93 | |
52e850de | 94 | /* Protected by lock. */ |
b58deb34 | 95 | QSIMPLEQ_HEAD(, BlkMigBlock) blk_list; |
c163b5ca LS |
96 | int submitted; |
97 | int read_done; | |
323920c4 PB |
98 | |
99 | /* Only used by migration thread. Does not need a lock. */ | |
c163b5ca | 100 | int transferred; |
01e61e2d | 101 | int prev_progress; |
e970ec0b | 102 | int bulk_completed; |
52e850de | 103 | |
b49f4755 | 104 | /* Lock must be taken _inside_ the iothread lock. */ |
52e850de | 105 | QemuMutex lock; |
c163b5ca LS |
106 | } BlkMigState; |
107 | ||
d11ecd3d | 108 | static BlkMigState block_mig_state; |
c163b5ca | 109 | |
52e850de PB |
110 | static void blk_mig_lock(void) |
111 | { | |
112 | qemu_mutex_lock(&block_mig_state.lock); | |
113 | } | |
114 | ||
115 | static void blk_mig_unlock(void) | |
116 | { | |
117 | qemu_mutex_unlock(&block_mig_state.lock); | |
118 | } | |
119 | ||
32c835ba PB |
120 | /* Must run outside of the iothread lock during the bulk phase, |
121 | * or the VM will stall. | |
122 | */ | |
123 | ||
13f0b67f JK |
124 | static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
125 | { | |
126 | int len; | |
323004a3 PL |
127 | uint64_t flags = BLK_MIG_FLAG_DEVICE_BLOCK; |
128 | ||
129 | if (block_mig_state.zero_blocks && | |
a152bd00 | 130 | buffer_is_zero(blk->buf, BLK_MIG_BLOCK_SIZE)) { |
323004a3 PL |
131 | flags |= BLK_MIG_FLAG_ZERO_BLOCK; |
132 | } | |
13f0b67f JK |
133 | |
134 | /* sector number and flags */ | |
135 | qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) | |
323004a3 | 136 | | flags); |
13f0b67f JK |
137 | |
138 | /* device name */ | |
ebd2f9e7 | 139 | len = strlen(blk->bmds->blk_name); |
13f0b67f | 140 | qemu_put_byte(f, len); |
ebd2f9e7 | 141 | qemu_put_buffer(f, (uint8_t *) blk->bmds->blk_name, len); |
13f0b67f | 142 | |
323004a3 PL |
143 | /* if a block is zero we need to flush here since the network |
144 | * bandwidth is now a lot higher than the storage device bandwidth. | |
145 | * thus if we queue zero blocks we slow down the migration */ | |
146 | if (flags & BLK_MIG_FLAG_ZERO_BLOCK) { | |
147 | qemu_fflush(f); | |
148 | return; | |
149 | } | |
150 | ||
a152bd00 | 151 | qemu_put_buffer(f, blk->buf, BLK_MIG_BLOCK_SIZE); |
13f0b67f JK |
152 | } |
153 | ||
25f23643 JK |
154 | int blk_mig_active(void) |
155 | { | |
156 | return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list); | |
157 | } | |
158 | ||
9ac78b61 PL |
159 | int blk_mig_bulk_active(void) |
160 | { | |
161 | return blk_mig_active() && !block_mig_state.bulk_completed; | |
162 | } | |
163 | ||
25f23643 JK |
164 | uint64_t blk_mig_bytes_transferred(void) |
165 | { | |
166 | BlkMigDevState *bmds; | |
167 | uint64_t sum = 0; | |
168 | ||
52e850de | 169 | blk_mig_lock(); |
25f23643 JK |
170 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
171 | sum += bmds->completed_sectors; | |
172 | } | |
52e850de | 173 | blk_mig_unlock(); |
25f23643 JK |
174 | return sum << BDRV_SECTOR_BITS; |
175 | } | |
176 | ||
177 | uint64_t blk_mig_bytes_remaining(void) | |
178 | { | |
179 | return blk_mig_bytes_total() - blk_mig_bytes_transferred(); | |
180 | } | |
181 | ||
182 | uint64_t blk_mig_bytes_total(void) | |
183 | { | |
184 | BlkMigDevState *bmds; | |
185 | uint64_t sum = 0; | |
186 | ||
187 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
188 | sum += bmds->total_sectors; | |
189 | } | |
190 | return sum << BDRV_SECTOR_BITS; | |
191 | } | |
192 | ||
52e850de PB |
193 | |
194 | /* Called with migration lock held. */ | |
195 | ||
33656af7 MT |
196 | static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector) |
197 | { | |
198 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
199 | ||
2c5451ca | 200 | if (sector < bmds->total_sectors) { |
33656af7 MT |
201 | return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
202 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
203 | } else { | |
204 | return 0; | |
205 | } | |
206 | } | |
207 | ||
52e850de PB |
208 | /* Called with migration lock held. */ |
209 | ||
33656af7 MT |
210 | static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num, |
211 | int nb_sectors, int set) | |
212 | { | |
213 | int64_t start, end; | |
214 | unsigned long val, idx, bit; | |
215 | ||
216 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
217 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
218 | ||
219 | for (; start <= end; start++) { | |
220 | idx = start / (sizeof(unsigned long) * 8); | |
221 | bit = start % (sizeof(unsigned long) * 8); | |
222 | val = bmds->aio_bitmap[idx]; | |
223 | if (set) { | |
62155e2b | 224 | val |= 1UL << bit; |
33656af7 | 225 | } else { |
62155e2b | 226 | val &= ~(1UL << bit); |
33656af7 MT |
227 | } |
228 | bmds->aio_bitmap[idx] = val; | |
229 | } | |
230 | } | |
231 | ||
232 | static void alloc_aio_bitmap(BlkMigDevState *bmds) | |
233 | { | |
33656af7 MT |
234 | int64_t bitmap_size; |
235 | ||
2c5451ca | 236 | bitmap_size = bmds->total_sectors + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
33656af7 MT |
237 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; |
238 | ||
7267c094 | 239 | bmds->aio_bitmap = g_malloc0(bitmap_size); |
33656af7 MT |
240 | } |
241 | ||
52e850de PB |
242 | /* Never hold migration lock when yielding to the main loop! */ |
243 | ||
c163b5ca LS |
244 | static void blk_mig_read_cb(void *opaque, int ret) |
245 | { | |
246 | BlkMigBlock *blk = opaque; | |
a55eb92c | 247 | |
52e850de | 248 | blk_mig_lock(); |
c163b5ca | 249 | blk->ret = ret; |
a55eb92c | 250 | |
5e5328be | 251 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
33656af7 | 252 | bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0); |
a55eb92c | 253 | |
d11ecd3d JK |
254 | block_mig_state.submitted--; |
255 | block_mig_state.read_done++; | |
256 | assert(block_mig_state.submitted >= 0); | |
52e850de | 257 | blk_mig_unlock(); |
c163b5ca LS |
258 | } |
259 | ||
32c835ba PB |
260 | /* Called with no lock taken. */ |
261 | ||
539de124 | 262 | static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds) |
a55eb92c | 263 | { |
57cce12d JK |
264 | int64_t total_sectors = bmds->total_sectors; |
265 | int64_t cur_sector = bmds->cur_sector; | |
ebd2f9e7 | 266 | BlockBackend *bb = bmds->blk; |
c163b5ca | 267 | BlkMigBlock *blk; |
13f0b67f | 268 | int nr_sectors; |
d6a644bb | 269 | int64_t count; |
a55eb92c | 270 | |
57cce12d | 271 | if (bmds->shared_base) { |
32c835ba | 272 | qemu_mutex_lock_iothread(); |
d6a644bb EB |
273 | /* Skip unallocated sectors; intentionally treats failure or |
274 | * partial sector as an allocated sector */ | |
b1d10856 | 275 | while (cur_sector < total_sectors && |
d6a644bb EB |
276 | !bdrv_is_allocated(blk_bs(bb), cur_sector * BDRV_SECTOR_SIZE, |
277 | MAX_IS_ALLOCATED_SEARCH, &count)) { | |
278 | if (count < BDRV_SECTOR_SIZE) { | |
279 | break; | |
280 | } | |
281 | cur_sector += count >> BDRV_SECTOR_BITS; | |
c163b5ca | 282 | } |
32c835ba | 283 | qemu_mutex_unlock_iothread(); |
c163b5ca | 284 | } |
a55eb92c JK |
285 | |
286 | if (cur_sector >= total_sectors) { | |
82801d8f | 287 | bmds->cur_sector = bmds->completed_sectors = total_sectors; |
c163b5ca LS |
288 | return 1; |
289 | } | |
a55eb92c | 290 | |
82801d8f | 291 | bmds->completed_sectors = cur_sector; |
a55eb92c | 292 | |
57cce12d JK |
293 | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1); |
294 | ||
6ea44308 JK |
295 | /* we are going to transfer a full block even if it is not allocated */ |
296 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
c163b5ca | 297 | |
6ea44308 | 298 | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
57cce12d | 299 | nr_sectors = total_sectors - cur_sector; |
c163b5ca | 300 | } |
a55eb92c | 301 | |
5839e53b | 302 | blk = g_new(BlkMigBlock, 1); |
a152bd00 | 303 | blk->buf = g_malloc(BLK_MIG_BLOCK_SIZE); |
13f0b67f JK |
304 | blk->bmds = bmds; |
305 | blk->sector = cur_sector; | |
33656af7 | 306 | blk->nr_sectors = nr_sectors; |
a55eb92c | 307 | |
f556f37b | 308 | qemu_iovec_init_buf(&blk->qiov, blk->buf, nr_sectors * BDRV_SECTOR_SIZE); |
a55eb92c | 309 | |
52e850de | 310 | blk_mig_lock(); |
13197e3c | 311 | block_mig_state.submitted++; |
52e850de | 312 | blk_mig_unlock(); |
13197e3c | 313 | |
b49f4755 SH |
314 | /* |
315 | * The migration thread does not have an AioContext. Lock the BQL so that | |
316 | * I/O runs in the main loop AioContext (see | |
317 | * qemu_get_current_aio_context()). | |
ef0716df | 318 | */ |
32c835ba | 319 | qemu_mutex_lock_iothread(); |
e0d7f73e EB |
320 | bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE, |
321 | nr_sectors * BDRV_SECTOR_SIZE); | |
86b124bc PL |
322 | blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov, |
323 | 0, blk_mig_read_cb, blk); | |
32c835ba | 324 | qemu_mutex_unlock_iothread(); |
a55eb92c | 325 | |
32c835ba | 326 | bmds->cur_sector = cur_sector + nr_sectors; |
13f0b67f | 327 | return (bmds->cur_sector >= total_sectors); |
c163b5ca LS |
328 | } |
329 | ||
32c835ba PB |
330 | /* Called with iothread lock taken. */ |
331 | ||
b8afb520 | 332 | static int set_dirty_tracking(void) |
c163b5ca LS |
333 | { |
334 | BlkMigDevState *bmds; | |
b8afb520 FZ |
335 | int ret; |
336 | ||
337 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
ebd2f9e7 | 338 | bmds->dirty_bitmap = bdrv_create_dirty_bitmap(blk_bs(bmds->blk), |
a152bd00 SH |
339 | BLK_MIG_BLOCK_SIZE, |
340 | NULL, NULL); | |
b8afb520 FZ |
341 | if (!bmds->dirty_bitmap) { |
342 | ret = -errno; | |
343 | goto fail; | |
344 | } | |
345 | } | |
346 | return 0; | |
5e5328be | 347 | |
b8afb520 | 348 | fail: |
5e5328be | 349 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
b8afb520 | 350 | if (bmds->dirty_bitmap) { |
5deb6cbd | 351 | bdrv_release_dirty_bitmap(bmds->dirty_bitmap); |
b8afb520 | 352 | } |
e4654d2d | 353 | } |
b8afb520 | 354 | return ret; |
e4654d2d FZ |
355 | } |
356 | ||
ef0716df PB |
357 | /* Called with iothread lock taken. */ |
358 | ||
e4654d2d FZ |
359 | static void unset_dirty_tracking(void) |
360 | { | |
361 | BlkMigDevState *bmds; | |
362 | ||
363 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
f187609f FR |
364 | if (bmds->dirty_bitmap) { |
365 | bdrv_release_dirty_bitmap(bmds->dirty_bitmap); | |
366 | } | |
c163b5ca | 367 | } |
c163b5ca LS |
368 | } |
369 | ||
6f5ef23a | 370 | static int init_blk_migration(QEMUFile *f) |
c163b5ca | 371 | { |
fea68bb6 | 372 | BlockDriverState *bs; |
5e5328be | 373 | BlkMigDevState *bmds; |
792773b2 | 374 | int64_t sectors; |
88be7b4b | 375 | BdrvNextIterator it; |
ebd2f9e7 KW |
376 | int i, num_bs = 0; |
377 | struct { | |
378 | BlkMigDevState *bmds; | |
379 | BlockDriverState *bs; | |
380 | } *bmds_bs; | |
6f5ef23a KW |
381 | Error *local_err = NULL; |
382 | int ret; | |
a55eb92c | 383 | |
2b3912f1 KW |
384 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
385 | ||
fea68bb6 MA |
386 | block_mig_state.submitted = 0; |
387 | block_mig_state.read_done = 0; | |
388 | block_mig_state.transferred = 0; | |
389 | block_mig_state.total_sector_sum = 0; | |
390 | block_mig_state.prev_progress = -1; | |
391 | block_mig_state.bulk_completed = 0; | |
392 | block_mig_state.zero_blocks = migrate_zero_blocks(); | |
393 | ||
88be7b4b | 394 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
ebd2f9e7 KW |
395 | num_bs++; |
396 | } | |
397 | bmds_bs = g_malloc0(num_bs * sizeof(*bmds_bs)); | |
398 | ||
399 | for (i = 0, bs = bdrv_first(&it); bs; bs = bdrv_next(&it), i++) { | |
fea68bb6 MA |
400 | if (bdrv_is_read_only(bs)) { |
401 | continue; | |
402 | } | |
403 | ||
57322b78 | 404 | sectors = bdrv_nb_sectors(bs); |
31f54f24 | 405 | if (sectors <= 0) { |
6f5ef23a | 406 | ret = sectors; |
5e003f17 | 407 | bdrv_next_cleanup(&it); |
ebd2f9e7 | 408 | goto out; |
b66460e4 SH |
409 | } |
410 | ||
5839e53b | 411 | bmds = g_new0(BlkMigDevState, 1); |
d861ab3a KW |
412 | bmds->blk = blk_new(qemu_get_aio_context(), |
413 | BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL); | |
ebd2f9e7 | 414 | bmds->blk_name = g_strdup(bdrv_get_device_name(bs)); |
b66460e4 SH |
415 | bmds->bulk_completed = 0; |
416 | bmds->total_sectors = sectors; | |
417 | bmds->completed_sectors = 0; | |
6f8be708 | 418 | bmds->shared_base = migrate_block_incremental(); |
ebd2f9e7 KW |
419 | |
420 | assert(i < num_bs); | |
421 | bmds_bs[i].bmds = bmds; | |
422 | bmds_bs[i].bs = bs; | |
b66460e4 SH |
423 | |
424 | block_mig_state.total_sector_sum += sectors; | |
425 | ||
426 | if (bmds->shared_base) { | |
fe80c024 | 427 | trace_migration_block_init_shared(bdrv_get_device_name(bs)); |
b66460e4 | 428 | } else { |
fe80c024 | 429 | trace_migration_block_init_full(bdrv_get_device_name(bs)); |
b66460e4 SH |
430 | } |
431 | ||
432 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); | |
433 | } | |
ebd2f9e7 KW |
434 | |
435 | /* Can only insert new BDSes now because doing so while iterating block | |
436 | * devices may end up in a deadlock (iterating the new BDSes, too). */ | |
437 | for (i = 0; i < num_bs; i++) { | |
7f3de3f0 MA |
438 | bmds = bmds_bs[i].bmds; |
439 | bs = bmds_bs[i].bs; | |
ebd2f9e7 KW |
440 | |
441 | if (bmds) { | |
6f5ef23a KW |
442 | ret = blk_insert_bs(bmds->blk, bs, &local_err); |
443 | if (ret < 0) { | |
444 | error_report_err(local_err); | |
445 | goto out; | |
446 | } | |
ebd2f9e7 KW |
447 | |
448 | alloc_aio_bitmap(bmds); | |
449 | error_setg(&bmds->blocker, "block device is in use by migration"); | |
450 | bdrv_op_block_all(bs, bmds->blocker); | |
451 | } | |
452 | } | |
453 | ||
6f5ef23a | 454 | ret = 0; |
ebd2f9e7 KW |
455 | out: |
456 | g_free(bmds_bs); | |
6f5ef23a | 457 | return ret; |
b66460e4 SH |
458 | } |
459 | ||
32c835ba PB |
460 | /* Called with no lock taken. */ |
461 | ||
539de124 | 462 | static int blk_mig_save_bulked_block(QEMUFile *f) |
c163b5ca | 463 | { |
82801d8f | 464 | int64_t completed_sector_sum = 0; |
c163b5ca | 465 | BlkMigDevState *bmds; |
01e61e2d | 466 | int progress; |
82801d8f | 467 | int ret = 0; |
c163b5ca | 468 | |
5e5328be | 469 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
a55eb92c | 470 | if (bmds->bulk_completed == 0) { |
539de124 | 471 | if (mig_save_device_bulk(f, bmds) == 1) { |
57cce12d JK |
472 | /* completed bulk section for this device */ |
473 | bmds->bulk_completed = 1; | |
c163b5ca | 474 | } |
82801d8f JK |
475 | completed_sector_sum += bmds->completed_sectors; |
476 | ret = 1; | |
477 | break; | |
478 | } else { | |
479 | completed_sector_sum += bmds->completed_sectors; | |
c163b5ca LS |
480 | } |
481 | } | |
a55eb92c | 482 | |
8b6b2afc PR |
483 | if (block_mig_state.total_sector_sum != 0) { |
484 | progress = completed_sector_sum * 100 / | |
485 | block_mig_state.total_sector_sum; | |
486 | } else { | |
487 | progress = 100; | |
488 | } | |
01e61e2d JK |
489 | if (progress != block_mig_state.prev_progress) { |
490 | block_mig_state.prev_progress = progress; | |
491 | qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) | |
492 | | BLK_MIG_FLAG_PROGRESS); | |
163b8663 | 493 | trace_migration_block_progression(progress); |
82801d8f JK |
494 | } |
495 | ||
496 | return ret; | |
c163b5ca LS |
497 | } |
498 | ||
d76cac7d | 499 | static void blk_mig_reset_dirty_cursor(void) |
c163b5ca LS |
500 | { |
501 | BlkMigDevState *bmds; | |
d76cac7d LS |
502 | |
503 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
504 | bmds->cur_dirty = 0; | |
505 | } | |
506 | } | |
507 | ||
b49f4755 | 508 | /* Called with iothread lock taken. */ |
32c835ba | 509 | |
539de124 LC |
510 | static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds, |
511 | int is_async) | |
d76cac7d LS |
512 | { |
513 | BlkMigBlock *blk; | |
514 | int64_t total_sectors = bmds->total_sectors; | |
c163b5ca | 515 | int64_t sector; |
d76cac7d | 516 | int nr_sectors; |
dcd1d224 | 517 | int ret = -EIO; |
a55eb92c | 518 | |
d76cac7d | 519 | for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) { |
52e850de | 520 | blk_mig_lock(); |
62155e2b | 521 | if (bmds_aio_inflight(bmds, sector)) { |
52e850de | 522 | blk_mig_unlock(); |
ebd2f9e7 | 523 | blk_drain(bmds->blk); |
52e850de PB |
524 | } else { |
525 | blk_mig_unlock(); | |
62155e2b | 526 | } |
b64bd51e | 527 | bdrv_dirty_bitmap_lock(bmds->dirty_bitmap); |
28636b82 JS |
528 | if (bdrv_dirty_bitmap_get_locked(bmds->dirty_bitmap, |
529 | sector * BDRV_SECTOR_SIZE)) { | |
d76cac7d LS |
530 | if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
531 | nr_sectors = total_sectors - sector; | |
532 | } else { | |
533 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
534 | } | |
e0d7f73e EB |
535 | bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, |
536 | sector * BDRV_SECTOR_SIZE, | |
537 | nr_sectors * BDRV_SECTOR_SIZE); | |
b64bd51e | 538 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); |
c0bad499 | 539 | |
5839e53b | 540 | blk = g_new(BlkMigBlock, 1); |
a152bd00 | 541 | blk->buf = g_malloc(BLK_MIG_BLOCK_SIZE); |
d76cac7d LS |
542 | blk->bmds = bmds; |
543 | blk->sector = sector; | |
33656af7 | 544 | blk->nr_sectors = nr_sectors; |
d76cac7d | 545 | |
889ae39c | 546 | if (is_async) { |
f556f37b VSO |
547 | qemu_iovec_init_buf(&blk->qiov, blk->buf, |
548 | nr_sectors * BDRV_SECTOR_SIZE); | |
d76cac7d | 549 | |
ebd2f9e7 KW |
550 | blk->aiocb = blk_aio_preadv(bmds->blk, |
551 | sector * BDRV_SECTOR_SIZE, | |
552 | &blk->qiov, 0, blk_mig_read_cb, | |
553 | blk); | |
52e850de PB |
554 | |
555 | blk_mig_lock(); | |
d76cac7d | 556 | block_mig_state.submitted++; |
33656af7 | 557 | bmds_set_aio_inflight(bmds, sector, nr_sectors, 1); |
52e850de | 558 | blk_mig_unlock(); |
d76cac7d | 559 | } else { |
3b35d454 | 560 | ret = blk_pread(bmds->blk, sector * BDRV_SECTOR_SIZE, |
a9262f55 | 561 | nr_sectors * BDRV_SECTOR_SIZE, blk->buf, 0); |
dcd1d224 | 562 | if (ret < 0) { |
d76cac7d | 563 | goto error; |
c163b5ca | 564 | } |
d76cac7d | 565 | blk_send(f, blk); |
a55eb92c | 566 | |
7267c094 AL |
567 | g_free(blk->buf); |
568 | g_free(blk); | |
a55eb92c | 569 | } |
d76cac7d | 570 | |
1cf6aa74 LC |
571 | sector += nr_sectors; |
572 | bmds->cur_dirty = sector; | |
d76cac7d | 573 | break; |
c163b5ca | 574 | } |
b64bd51e PB |
575 | |
576 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); | |
d76cac7d LS |
577 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
578 | bmds->cur_dirty = sector; | |
c163b5ca | 579 | } |
575a58d7 | 580 | |
d76cac7d LS |
581 | return (bmds->cur_dirty >= bmds->total_sectors); |
582 | ||
889ae39c | 583 | error: |
fe80c024 | 584 | trace_migration_block_save_device_dirty(sector); |
7267c094 AL |
585 | g_free(blk->buf); |
586 | g_free(blk); | |
43be3a25 | 587 | return ret; |
d76cac7d LS |
588 | } |
589 | ||
32c835ba PB |
590 | /* Called with iothread lock taken. |
591 | * | |
592 | * return value: | |
ceb2bd09 JQ |
593 | * 0: too much data for max_downtime |
594 | * 1: few enough data for max_downtime | |
595 | */ | |
539de124 | 596 | static int blk_mig_save_dirty_block(QEMUFile *f, int is_async) |
d76cac7d LS |
597 | { |
598 | BlkMigDevState *bmds; | |
ceb2bd09 | 599 | int ret = 1; |
d76cac7d LS |
600 | |
601 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
ceb2bd09 | 602 | ret = mig_save_device_dirty(f, bmds, is_async); |
43be3a25 | 603 | if (ret <= 0) { |
d76cac7d LS |
604 | break; |
605 | } | |
606 | } | |
607 | ||
608 | return ret; | |
c163b5ca LS |
609 | } |
610 | ||
32c835ba PB |
611 | /* Called with no locks taken. */ |
612 | ||
59feec42 | 613 | static int flush_blks(QEMUFile *f) |
c163b5ca | 614 | { |
5e5328be | 615 | BlkMigBlock *blk; |
59feec42 | 616 | int ret = 0; |
a55eb92c | 617 | |
fe80c024 BY |
618 | trace_migration_block_flush_blks("Enter", block_mig_state.submitted, |
619 | block_mig_state.read_done, | |
620 | block_mig_state.transferred); | |
a55eb92c | 621 | |
52e850de | 622 | blk_mig_lock(); |
5e5328be | 623 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
e1fde0e0 | 624 | if (migration_rate_exceeded(f)) { |
5e5328be JK |
625 | break; |
626 | } | |
4b640365 | 627 | if (blk->ret < 0) { |
59feec42 | 628 | ret = blk->ret; |
4b640365 JK |
629 | break; |
630 | } | |
a55eb92c | 631 | |
5e5328be | 632 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
52e850de | 633 | blk_mig_unlock(); |
13197e3c | 634 | blk_send(f, blk); |
52e850de | 635 | blk_mig_lock(); |
13197e3c | 636 | |
7267c094 AL |
637 | g_free(blk->buf); |
638 | g_free(blk); | |
a55eb92c | 639 | |
d11ecd3d JK |
640 | block_mig_state.read_done--; |
641 | block_mig_state.transferred++; | |
642 | assert(block_mig_state.read_done >= 0); | |
c163b5ca | 643 | } |
52e850de | 644 | blk_mig_unlock(); |
c163b5ca | 645 | |
fe80c024 BY |
646 | trace_migration_block_flush_blks("Exit", block_mig_state.submitted, |
647 | block_mig_state.read_done, | |
648 | block_mig_state.transferred); | |
59feec42 | 649 | return ret; |
c163b5ca LS |
650 | } |
651 | ||
32c835ba PB |
652 | /* Called with iothread lock taken. */ |
653 | ||
889ae39c LS |
654 | static int64_t get_remaining_dirty(void) |
655 | { | |
656 | BlkMigDevState *bmds; | |
657 | int64_t dirty = 0; | |
658 | ||
659 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
b49f4755 | 660 | bdrv_dirty_bitmap_lock(bmds->dirty_bitmap); |
20dca810 | 661 | dirty += bdrv_get_dirty_count(bmds->dirty_bitmap); |
b49f4755 | 662 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); |
889ae39c LS |
663 | } |
664 | ||
9a46dba7 | 665 | return dirty; |
889ae39c LS |
666 | } |
667 | ||
32c835ba | 668 | |
362fdf17 KW |
669 | |
670 | /* Called with iothread lock taken. */ | |
671 | static void block_migration_cleanup_bmds(void) | |
4ec7fcc7 | 672 | { |
82801d8f | 673 | BlkMigDevState *bmds; |
f187609f | 674 | BlockDriverState *bs; |
4ec7fcc7 | 675 | |
e4654d2d | 676 | unset_dirty_tracking(); |
8f794c55 | 677 | |
82801d8f JK |
678 | while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
679 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); | |
f187609f FR |
680 | |
681 | bs = blk_bs(bmds->blk); | |
682 | if (bs) { | |
683 | bdrv_op_unblock_all(bs, bmds->blocker); | |
684 | } | |
3718d8ab | 685 | error_free(bmds->blocker); |
ebd2f9e7 | 686 | blk_unref(bmds->blk); |
ebd2f9e7 | 687 | g_free(bmds->blk_name); |
7267c094 AL |
688 | g_free(bmds->aio_bitmap); |
689 | g_free(bmds); | |
4ec7fcc7 | 690 | } |
362fdf17 KW |
691 | } |
692 | ||
693 | /* Called with iothread lock taken. */ | |
694 | static void block_migration_cleanup(void *opaque) | |
695 | { | |
696 | BlkMigBlock *blk; | |
697 | ||
698 | bdrv_drain_all(); | |
699 | ||
700 | block_migration_cleanup_bmds(); | |
4ec7fcc7 | 701 | |
ef0716df | 702 | blk_mig_lock(); |
82801d8f JK |
703 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
704 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); | |
7267c094 AL |
705 | g_free(blk->buf); |
706 | g_free(blk); | |
4ec7fcc7 | 707 | } |
52e850de | 708 | blk_mig_unlock(); |
4ec7fcc7 JK |
709 | } |
710 | ||
d1315aac | 711 | static int block_save_setup(QEMUFile *f, void *opaque) |
c163b5ca | 712 | { |
2975725f JQ |
713 | int ret; |
714 | ||
fe80c024 BY |
715 | trace_migration_block_save("setup", block_mig_state.submitted, |
716 | block_mig_state.transferred); | |
a55eb92c | 717 | |
66db46ca JQ |
718 | warn_report("block migration is deprecated;" |
719 | " use blockdev-mirror with NBD instead"); | |
720 | ||
6f5ef23a KW |
721 | ret = init_blk_migration(f); |
722 | if (ret < 0) { | |
6f5ef23a KW |
723 | return ret; |
724 | } | |
d1315aac JQ |
725 | |
726 | /* start track dirty blocks */ | |
b8afb520 | 727 | ret = set_dirty_tracking(); |
b8afb520 | 728 | if (ret) { |
b8afb520 FZ |
729 | return ret; |
730 | } | |
731 | ||
59feec42 | 732 | ret = flush_blks(f); |
d1315aac | 733 | blk_mig_reset_dirty_cursor(); |
d1315aac JQ |
734 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
735 | ||
d418cf57 | 736 | return ret; |
d1315aac JQ |
737 | } |
738 | ||
16310a3c | 739 | static int block_save_iterate(QEMUFile *f, void *opaque) |
d1315aac JQ |
740 | { |
741 | int ret; | |
e9c0eed7 | 742 | uint64_t last_bytes = qemu_file_transferred(f); |
d1315aac | 743 | |
fe80c024 BY |
744 | trace_migration_block_save("iterate", block_mig_state.submitted, |
745 | block_mig_state.transferred); | |
d1315aac | 746 | |
59feec42 | 747 | ret = flush_blks(f); |
2975725f | 748 | if (ret) { |
2975725f | 749 | return ret; |
4b640365 JK |
750 | } |
751 | ||
d76cac7d LS |
752 | blk_mig_reset_dirty_cursor(); |
753 | ||
16310a3c | 754 | /* control the rate of transfer */ |
52e850de | 755 | blk_mig_lock(); |
a152bd00 | 756 | while (block_mig_state.read_done * BLK_MIG_BLOCK_SIZE < |
e1fde0e0 | 757 | migration_rate_get() && |
44815334 | 758 | block_mig_state.submitted < MAX_PARALLEL_IO && |
ef9c5160 PL |
759 | (block_mig_state.submitted + block_mig_state.read_done) < |
760 | MAX_IO_BUFFERS) { | |
52e850de | 761 | blk_mig_unlock(); |
16310a3c JQ |
762 | if (block_mig_state.bulk_completed == 0) { |
763 | /* first finish the bulk phase */ | |
764 | if (blk_mig_save_bulked_block(f) == 0) { | |
765 | /* finished saving bulk on all devices */ | |
766 | block_mig_state.bulk_completed = 1; | |
767 | } | |
13197e3c | 768 | ret = 0; |
16310a3c | 769 | } else { |
32c835ba PB |
770 | /* Always called with iothread lock taken for |
771 | * simplicity, block_save_complete also calls it. | |
772 | */ | |
773 | qemu_mutex_lock_iothread(); | |
43be3a25 | 774 | ret = blk_mig_save_dirty_block(f, 1); |
32c835ba | 775 | qemu_mutex_unlock_iothread(); |
13197e3c PB |
776 | } |
777 | if (ret < 0) { | |
778 | return ret; | |
779 | } | |
52e850de | 780 | blk_mig_lock(); |
13197e3c PB |
781 | if (ret != 0) { |
782 | /* no more dirty blocks */ | |
783 | break; | |
a55eb92c | 784 | } |
16310a3c | 785 | } |
52e850de | 786 | blk_mig_unlock(); |
a55eb92c | 787 | |
59feec42 | 788 | ret = flush_blks(f); |
16310a3c | 789 | if (ret) { |
16310a3c | 790 | return ret; |
4b640365 JK |
791 | } |
792 | ||
16310a3c | 793 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
e9c0eed7 | 794 | uint64_t delta_bytes = qemu_file_transferred(f) - last_bytes; |
f3030d34 | 795 | return (delta_bytes > 0); |
16310a3c JQ |
796 | } |
797 | ||
32c835ba PB |
798 | /* Called with iothread lock taken. */ |
799 | ||
16310a3c JQ |
800 | static int block_save_complete(QEMUFile *f, void *opaque) |
801 | { | |
802 | int ret; | |
803 | ||
fe80c024 BY |
804 | trace_migration_block_save("complete", block_mig_state.submitted, |
805 | block_mig_state.transferred); | |
16310a3c | 806 | |
59feec42 | 807 | ret = flush_blks(f); |
16310a3c | 808 | if (ret) { |
16310a3c JQ |
809 | return ret; |
810 | } | |
a55eb92c | 811 | |
16310a3c | 812 | blk_mig_reset_dirty_cursor(); |
01e61e2d | 813 | |
16310a3c JQ |
814 | /* we know for sure that save bulk is completed and |
815 | all async read completed */ | |
52e850de | 816 | blk_mig_lock(); |
16310a3c | 817 | assert(block_mig_state.submitted == 0); |
52e850de | 818 | blk_mig_unlock(); |
16310a3c | 819 | |
43be3a25 JQ |
820 | do { |
821 | ret = blk_mig_save_dirty_block(f, 0); | |
d418cf57 PB |
822 | if (ret < 0) { |
823 | return ret; | |
824 | } | |
43be3a25 | 825 | } while (ret == 0); |
4b640365 | 826 | |
43be3a25 JQ |
827 | /* report completion */ |
828 | qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS); | |
a55eb92c | 829 | |
fe80c024 | 830 | trace_migration_block_save_complete(); |
16310a3c | 831 | |
a55eb92c JK |
832 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
833 | ||
362fdf17 KW |
834 | /* Make sure that our BlockBackends are gone, so that the block driver |
835 | * nodes can be inactivated. */ | |
836 | block_migration_cleanup_bmds(); | |
837 | ||
16310a3c | 838 | return 0; |
c163b5ca LS |
839 | } |
840 | ||
24beea4e JQ |
841 | static void block_state_pending(void *opaque, uint64_t *must_precopy, |
842 | uint64_t *can_postcopy) | |
e4ed1541 | 843 | { |
6aaa9dae | 844 | /* Estimate pending number of bytes to send */ |
13197e3c PB |
845 | uint64_t pending; |
846 | ||
32c835ba | 847 | qemu_mutex_lock_iothread(); |
ef0716df PB |
848 | pending = get_remaining_dirty(); |
849 | qemu_mutex_unlock_iothread(); | |
850 | ||
52e850de | 851 | blk_mig_lock(); |
a152bd00 SH |
852 | pending += block_mig_state.submitted * BLK_MIG_BLOCK_SIZE + |
853 | block_mig_state.read_done * BLK_MIG_BLOCK_SIZE; | |
ef0716df | 854 | blk_mig_unlock(); |
6aaa9dae SH |
855 | |
856 | /* Report at least one block pending during bulk phase */ | |
b5280437 JQ |
857 | if (!pending && !block_mig_state.bulk_completed) { |
858 | pending = BLK_MIG_BLOCK_SIZE; | |
6aaa9dae | 859 | } |
e4ed1541 | 860 | |
c8df4a7a | 861 | trace_migration_block_state_pending(pending); |
c31b098f | 862 | /* We don't do postcopy */ |
24beea4e | 863 | *must_precopy += pending; |
e4ed1541 JQ |
864 | } |
865 | ||
c163b5ca LS |
866 | static int block_load(QEMUFile *f, void *opaque, int version_id) |
867 | { | |
01e61e2d | 868 | static int banner_printed; |
c163b5ca LS |
869 | int len, flags; |
870 | char device_name[256]; | |
871 | int64_t addr; | |
3c254ab8 | 872 | BlockBackend *blk, *blk_prev = NULL; |
9bd9c7f5 | 873 | Error *local_err = NULL; |
c163b5ca | 874 | uint8_t *buf; |
77358b59 PR |
875 | int64_t total_sectors = 0; |
876 | int nr_sectors; | |
42802d47 | 877 | int ret; |
3928d50b | 878 | BlockDriverInfo bdi; |
a152bd00 | 879 | int cluster_size = BLK_MIG_BLOCK_SIZE; |
a55eb92c | 880 | |
c163b5ca | 881 | do { |
c163b5ca | 882 | addr = qemu_get_be64(f); |
a55eb92c | 883 | |
89725715 | 884 | flags = addr & (BDRV_SECTOR_SIZE - 1); |
6ea44308 | 885 | addr >>= BDRV_SECTOR_BITS; |
a55eb92c JK |
886 | |
887 | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { | |
c163b5ca LS |
888 | /* get device name */ |
889 | len = qemu_get_byte(f); | |
c163b5ca LS |
890 | qemu_get_buffer(f, (uint8_t *)device_name, len); |
891 | device_name[len] = '\0'; | |
a55eb92c | 892 | |
c9ebaf74 FZ |
893 | blk = blk_by_name(device_name); |
894 | if (!blk) { | |
4b640365 JK |
895 | fprintf(stderr, "Error unknown block device %s\n", |
896 | device_name); | |
897 | return -EINVAL; | |
898 | } | |
a55eb92c | 899 | |
ad2964b4 KW |
900 | if (blk != blk_prev) { |
901 | blk_prev = blk; | |
902 | total_sectors = blk_nb_sectors(blk); | |
77358b59 | 903 | if (total_sectors <= 0) { |
6daf194d | 904 | error_report("Error getting length of block device %s", |
77358b59 PR |
905 | device_name); |
906 | return -EINVAL; | |
907 | } | |
9bd9c7f5 | 908 | |
3b717194 | 909 | blk_activate(blk, &local_err); |
9bd9c7f5 KW |
910 | if (local_err) { |
911 | error_report_err(local_err); | |
912 | return -EINVAL; | |
913 | } | |
3928d50b LC |
914 | |
915 | ret = bdrv_get_info(blk_bs(blk), &bdi); | |
916 | if (ret == 0 && bdi.cluster_size > 0 && | |
a152bd00 SH |
917 | bdi.cluster_size <= BLK_MIG_BLOCK_SIZE && |
918 | BLK_MIG_BLOCK_SIZE % bdi.cluster_size == 0) { | |
3928d50b LC |
919 | cluster_size = bdi.cluster_size; |
920 | } else { | |
a152bd00 | 921 | cluster_size = BLK_MIG_BLOCK_SIZE; |
3928d50b | 922 | } |
77358b59 PR |
923 | } |
924 | ||
925 | if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) { | |
926 | nr_sectors = total_sectors - addr; | |
927 | } else { | |
928 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
929 | } | |
930 | ||
323004a3 | 931 | if (flags & BLK_MIG_FLAG_ZERO_BLOCK) { |
ad2964b4 KW |
932 | ret = blk_pwrite_zeroes(blk, addr * BDRV_SECTOR_SIZE, |
933 | nr_sectors * BDRV_SECTOR_SIZE, | |
934 | BDRV_REQ_MAY_UNMAP); | |
323004a3 | 935 | } else { |
3928d50b LC |
936 | int i; |
937 | int64_t cur_addr; | |
938 | uint8_t *cur_buf; | |
939 | ||
a152bd00 SH |
940 | buf = g_malloc(BLK_MIG_BLOCK_SIZE); |
941 | qemu_get_buffer(f, buf, BLK_MIG_BLOCK_SIZE); | |
942 | for (i = 0; i < BLK_MIG_BLOCK_SIZE / cluster_size; i++) { | |
3928d50b LC |
943 | cur_addr = addr * BDRV_SECTOR_SIZE + i * cluster_size; |
944 | cur_buf = buf + i * cluster_size; | |
945 | ||
946 | if ((!block_mig_state.zero_blocks || | |
a152bd00 | 947 | cluster_size < BLK_MIG_BLOCK_SIZE) && |
3928d50b LC |
948 | buffer_is_zero(cur_buf, cluster_size)) { |
949 | ret = blk_pwrite_zeroes(blk, cur_addr, | |
950 | cluster_size, | |
951 | BDRV_REQ_MAY_UNMAP); | |
952 | } else { | |
a9262f55 AF |
953 | ret = blk_pwrite(blk, cur_addr, cluster_size, cur_buf, |
954 | 0); | |
3928d50b LC |
955 | } |
956 | if (ret < 0) { | |
957 | break; | |
958 | } | |
959 | } | |
323004a3 PL |
960 | g_free(buf); |
961 | } | |
575a58d7 | 962 | |
b02bea3a YT |
963 | if (ret < 0) { |
964 | return ret; | |
965 | } | |
01e61e2d JK |
966 | } else if (flags & BLK_MIG_FLAG_PROGRESS) { |
967 | if (!banner_printed) { | |
968 | printf("Receiving block device images\n"); | |
969 | banner_printed = 1; | |
970 | } | |
971 | printf("Completed %d %%%c", (int)addr, | |
972 | (addr == 100) ? '\n' : '\r'); | |
973 | fflush(stdout); | |
a55eb92c | 974 | } else if (!(flags & BLK_MIG_FLAG_EOS)) { |
29fccade | 975 | fprintf(stderr, "Unknown block migration flags: 0x%x\n", flags); |
4b640365 JK |
976 | return -EINVAL; |
977 | } | |
42802d47 JQ |
978 | ret = qemu_file_get_error(f); |
979 | if (ret != 0) { | |
980 | return ret; | |
c163b5ca | 981 | } |
a55eb92c JK |
982 | } while (!(flags & BLK_MIG_FLAG_EOS)); |
983 | ||
c163b5ca LS |
984 | return 0; |
985 | } | |
986 | ||
6bd68781 JQ |
987 | static bool block_is_active(void *opaque) |
988 | { | |
9d4b1e5f | 989 | return migrate_block(); |
6bd68781 JQ |
990 | } |
991 | ||
7a46d042 | 992 | static SaveVMHandlers savevm_block_handlers = { |
9907e842 | 993 | .save_setup = block_save_setup, |
16310a3c | 994 | .save_live_iterate = block_save_iterate, |
a3e06c3d | 995 | .save_live_complete_precopy = block_save_complete, |
c8df4a7a JQ |
996 | .state_pending_exact = block_state_pending, |
997 | .state_pending_estimate = block_state_pending, | |
7908c78d | 998 | .load_state = block_load, |
70f794fc | 999 | .save_cleanup = block_migration_cleanup, |
6bd68781 | 1000 | .is_active = block_is_active, |
7908c78d JQ |
1001 | }; |
1002 | ||
c163b5ca | 1003 | void blk_mig_init(void) |
a55eb92c | 1004 | { |
5e5328be JK |
1005 | QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
1006 | QSIMPLEQ_INIT(&block_mig_state.blk_list); | |
52e850de | 1007 | qemu_mutex_init(&block_mig_state.lock); |
5e5328be | 1008 | |
ce62df53 | 1009 | register_savevm_live("block", 0, 1, &savevm_block_handlers, |
7908c78d | 1010 | &block_mig_state); |
c163b5ca | 1011 | } |