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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 | * | |
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 | |
a4a411fb | 104 | /* Lock must be taken _inside_ the BQL. */ |
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 | ||
a4a411fb | 120 | /* Must run outside of the BQL during the bulk phase, |
32c835ba PB |
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) { |
195801d7 | 272 | bql_lock(); |
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 | } |
195801d7 | 283 | bql_unlock(); |
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 | */ |
195801d7 | 319 | bql_lock(); |
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); | |
195801d7 | 324 | bql_unlock(); |
a55eb92c | 325 | |
32c835ba | 326 | bmds->cur_sector = cur_sector + nr_sectors; |
13f0b67f | 327 | return (bmds->cur_sector >= total_sectors); |
c163b5ca LS |
328 | } |
329 | ||
a4a411fb | 330 | /* Called with the BQL taken. */ |
32c835ba | 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 | ||
a4a411fb | 357 | /* Called with the BQL taken. */ |
ef0716df | 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 | ||
150da48c | 370 | static int init_blk_migration(QEMUFile *f, Error **errp) |
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 | 381 | int ret; |
a55eb92c | 382 | |
2b3912f1 KW |
383 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
384 | ||
fea68bb6 MA |
385 | block_mig_state.submitted = 0; |
386 | block_mig_state.read_done = 0; | |
387 | block_mig_state.transferred = 0; | |
388 | block_mig_state.total_sector_sum = 0; | |
389 | block_mig_state.prev_progress = -1; | |
390 | block_mig_state.bulk_completed = 0; | |
391 | block_mig_state.zero_blocks = migrate_zero_blocks(); | |
392 | ||
88be7b4b | 393 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
ebd2f9e7 KW |
394 | num_bs++; |
395 | } | |
396 | bmds_bs = g_malloc0(num_bs * sizeof(*bmds_bs)); | |
397 | ||
398 | for (i = 0, bs = bdrv_first(&it); bs; bs = bdrv_next(&it), i++) { | |
fea68bb6 MA |
399 | if (bdrv_is_read_only(bs)) { |
400 | continue; | |
401 | } | |
402 | ||
57322b78 | 403 | sectors = bdrv_nb_sectors(bs); |
2e128776 CLG |
404 | if (sectors == 0) { |
405 | continue; | |
406 | } | |
407 | if (sectors < 0) { | |
150da48c CLG |
408 | error_setg(errp, "Error getting length of block device %s", |
409 | bdrv_get_device_name(bs)); | |
6f5ef23a | 410 | ret = sectors; |
5e003f17 | 411 | bdrv_next_cleanup(&it); |
ebd2f9e7 | 412 | goto out; |
b66460e4 SH |
413 | } |
414 | ||
5839e53b | 415 | bmds = g_new0(BlkMigDevState, 1); |
d861ab3a KW |
416 | bmds->blk = blk_new(qemu_get_aio_context(), |
417 | BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL); | |
ebd2f9e7 | 418 | bmds->blk_name = g_strdup(bdrv_get_device_name(bs)); |
b66460e4 SH |
419 | bmds->bulk_completed = 0; |
420 | bmds->total_sectors = sectors; | |
421 | bmds->completed_sectors = 0; | |
ebd2f9e7 KW |
422 | |
423 | assert(i < num_bs); | |
424 | bmds_bs[i].bmds = bmds; | |
425 | bmds_bs[i].bs = bs; | |
b66460e4 SH |
426 | |
427 | block_mig_state.total_sector_sum += sectors; | |
428 | ||
429 | if (bmds->shared_base) { | |
fe80c024 | 430 | trace_migration_block_init_shared(bdrv_get_device_name(bs)); |
b66460e4 | 431 | } else { |
fe80c024 | 432 | trace_migration_block_init_full(bdrv_get_device_name(bs)); |
b66460e4 SH |
433 | } |
434 | ||
435 | QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); | |
436 | } | |
ebd2f9e7 KW |
437 | |
438 | /* Can only insert new BDSes now because doing so while iterating block | |
439 | * devices may end up in a deadlock (iterating the new BDSes, too). */ | |
440 | for (i = 0; i < num_bs; i++) { | |
7f3de3f0 MA |
441 | bmds = bmds_bs[i].bmds; |
442 | bs = bmds_bs[i].bs; | |
ebd2f9e7 KW |
443 | |
444 | if (bmds) { | |
150da48c | 445 | ret = blk_insert_bs(bmds->blk, bs, errp); |
6f5ef23a | 446 | if (ret < 0) { |
6f5ef23a KW |
447 | goto out; |
448 | } | |
ebd2f9e7 KW |
449 | |
450 | alloc_aio_bitmap(bmds); | |
451 | error_setg(&bmds->blocker, "block device is in use by migration"); | |
452 | bdrv_op_block_all(bs, bmds->blocker); | |
453 | } | |
454 | } | |
455 | ||
6f5ef23a | 456 | ret = 0; |
ebd2f9e7 KW |
457 | out: |
458 | g_free(bmds_bs); | |
6f5ef23a | 459 | return ret; |
b66460e4 SH |
460 | } |
461 | ||
32c835ba PB |
462 | /* Called with no lock taken. */ |
463 | ||
539de124 | 464 | static int blk_mig_save_bulked_block(QEMUFile *f) |
c163b5ca | 465 | { |
82801d8f | 466 | int64_t completed_sector_sum = 0; |
c163b5ca | 467 | BlkMigDevState *bmds; |
01e61e2d | 468 | int progress; |
82801d8f | 469 | int ret = 0; |
c163b5ca | 470 | |
5e5328be | 471 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
a55eb92c | 472 | if (bmds->bulk_completed == 0) { |
539de124 | 473 | if (mig_save_device_bulk(f, bmds) == 1) { |
57cce12d JK |
474 | /* completed bulk section for this device */ |
475 | bmds->bulk_completed = 1; | |
c163b5ca | 476 | } |
82801d8f JK |
477 | completed_sector_sum += bmds->completed_sectors; |
478 | ret = 1; | |
479 | break; | |
480 | } else { | |
481 | completed_sector_sum += bmds->completed_sectors; | |
c163b5ca LS |
482 | } |
483 | } | |
a55eb92c | 484 | |
8b6b2afc PR |
485 | if (block_mig_state.total_sector_sum != 0) { |
486 | progress = completed_sector_sum * 100 / | |
487 | block_mig_state.total_sector_sum; | |
488 | } else { | |
489 | progress = 100; | |
490 | } | |
01e61e2d JK |
491 | if (progress != block_mig_state.prev_progress) { |
492 | block_mig_state.prev_progress = progress; | |
493 | qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) | |
494 | | BLK_MIG_FLAG_PROGRESS); | |
163b8663 | 495 | trace_migration_block_progression(progress); |
82801d8f JK |
496 | } |
497 | ||
498 | return ret; | |
c163b5ca LS |
499 | } |
500 | ||
d76cac7d | 501 | static void blk_mig_reset_dirty_cursor(void) |
c163b5ca LS |
502 | { |
503 | BlkMigDevState *bmds; | |
d76cac7d LS |
504 | |
505 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
506 | bmds->cur_dirty = 0; | |
507 | } | |
508 | } | |
509 | ||
a4a411fb | 510 | /* Called with the BQL taken. */ |
32c835ba | 511 | |
539de124 LC |
512 | static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds, |
513 | int is_async) | |
d76cac7d LS |
514 | { |
515 | BlkMigBlock *blk; | |
516 | int64_t total_sectors = bmds->total_sectors; | |
c163b5ca | 517 | int64_t sector; |
d76cac7d | 518 | int nr_sectors; |
dcd1d224 | 519 | int ret = -EIO; |
a55eb92c | 520 | |
d76cac7d | 521 | for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) { |
52e850de | 522 | blk_mig_lock(); |
62155e2b | 523 | if (bmds_aio_inflight(bmds, sector)) { |
52e850de | 524 | blk_mig_unlock(); |
ebd2f9e7 | 525 | blk_drain(bmds->blk); |
52e850de PB |
526 | } else { |
527 | blk_mig_unlock(); | |
62155e2b | 528 | } |
b64bd51e | 529 | bdrv_dirty_bitmap_lock(bmds->dirty_bitmap); |
28636b82 JS |
530 | if (bdrv_dirty_bitmap_get_locked(bmds->dirty_bitmap, |
531 | sector * BDRV_SECTOR_SIZE)) { | |
d76cac7d LS |
532 | if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { |
533 | nr_sectors = total_sectors - sector; | |
534 | } else { | |
535 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
536 | } | |
e0d7f73e EB |
537 | bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, |
538 | sector * BDRV_SECTOR_SIZE, | |
539 | nr_sectors * BDRV_SECTOR_SIZE); | |
b64bd51e | 540 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); |
c0bad499 | 541 | |
5839e53b | 542 | blk = g_new(BlkMigBlock, 1); |
a152bd00 | 543 | blk->buf = g_malloc(BLK_MIG_BLOCK_SIZE); |
d76cac7d LS |
544 | blk->bmds = bmds; |
545 | blk->sector = sector; | |
33656af7 | 546 | blk->nr_sectors = nr_sectors; |
d76cac7d | 547 | |
889ae39c | 548 | if (is_async) { |
f556f37b VSO |
549 | qemu_iovec_init_buf(&blk->qiov, blk->buf, |
550 | nr_sectors * BDRV_SECTOR_SIZE); | |
d76cac7d | 551 | |
ebd2f9e7 KW |
552 | blk->aiocb = blk_aio_preadv(bmds->blk, |
553 | sector * BDRV_SECTOR_SIZE, | |
554 | &blk->qiov, 0, blk_mig_read_cb, | |
555 | blk); | |
52e850de PB |
556 | |
557 | blk_mig_lock(); | |
d76cac7d | 558 | block_mig_state.submitted++; |
33656af7 | 559 | bmds_set_aio_inflight(bmds, sector, nr_sectors, 1); |
52e850de | 560 | blk_mig_unlock(); |
d76cac7d | 561 | } else { |
3b35d454 | 562 | ret = blk_pread(bmds->blk, sector * BDRV_SECTOR_SIZE, |
a9262f55 | 563 | nr_sectors * BDRV_SECTOR_SIZE, blk->buf, 0); |
dcd1d224 | 564 | if (ret < 0) { |
d76cac7d | 565 | goto error; |
c163b5ca | 566 | } |
d76cac7d | 567 | blk_send(f, blk); |
a55eb92c | 568 | |
7267c094 AL |
569 | g_free(blk->buf); |
570 | g_free(blk); | |
a55eb92c | 571 | } |
d76cac7d | 572 | |
1cf6aa74 LC |
573 | sector += nr_sectors; |
574 | bmds->cur_dirty = sector; | |
d76cac7d | 575 | break; |
c163b5ca | 576 | } |
b64bd51e PB |
577 | |
578 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); | |
d76cac7d LS |
579 | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
580 | bmds->cur_dirty = sector; | |
c163b5ca | 581 | } |
575a58d7 | 582 | |
d76cac7d LS |
583 | return (bmds->cur_dirty >= bmds->total_sectors); |
584 | ||
889ae39c | 585 | error: |
fe80c024 | 586 | trace_migration_block_save_device_dirty(sector); |
7267c094 AL |
587 | g_free(blk->buf); |
588 | g_free(blk); | |
43be3a25 | 589 | return ret; |
d76cac7d LS |
590 | } |
591 | ||
a4a411fb | 592 | /* Called with the BQL taken. |
32c835ba PB |
593 | * |
594 | * return value: | |
ceb2bd09 JQ |
595 | * 0: too much data for max_downtime |
596 | * 1: few enough data for max_downtime | |
597 | */ | |
539de124 | 598 | static int blk_mig_save_dirty_block(QEMUFile *f, int is_async) |
d76cac7d LS |
599 | { |
600 | BlkMigDevState *bmds; | |
ceb2bd09 | 601 | int ret = 1; |
d76cac7d LS |
602 | |
603 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
ceb2bd09 | 604 | ret = mig_save_device_dirty(f, bmds, is_async); |
43be3a25 | 605 | if (ret <= 0) { |
d76cac7d LS |
606 | break; |
607 | } | |
608 | } | |
609 | ||
610 | return ret; | |
c163b5ca LS |
611 | } |
612 | ||
32c835ba PB |
613 | /* Called with no locks taken. */ |
614 | ||
59feec42 | 615 | static int flush_blks(QEMUFile *f) |
c163b5ca | 616 | { |
5e5328be | 617 | BlkMigBlock *blk; |
59feec42 | 618 | int ret = 0; |
a55eb92c | 619 | |
fe80c024 BY |
620 | trace_migration_block_flush_blks("Enter", block_mig_state.submitted, |
621 | block_mig_state.read_done, | |
622 | block_mig_state.transferred); | |
a55eb92c | 623 | |
52e850de | 624 | blk_mig_lock(); |
5e5328be | 625 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
e1fde0e0 | 626 | if (migration_rate_exceeded(f)) { |
5e5328be JK |
627 | break; |
628 | } | |
4b640365 | 629 | if (blk->ret < 0) { |
59feec42 | 630 | ret = blk->ret; |
4b640365 JK |
631 | break; |
632 | } | |
a55eb92c | 633 | |
5e5328be | 634 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
52e850de | 635 | blk_mig_unlock(); |
13197e3c | 636 | blk_send(f, blk); |
52e850de | 637 | blk_mig_lock(); |
13197e3c | 638 | |
7267c094 AL |
639 | g_free(blk->buf); |
640 | g_free(blk); | |
a55eb92c | 641 | |
d11ecd3d JK |
642 | block_mig_state.read_done--; |
643 | block_mig_state.transferred++; | |
644 | assert(block_mig_state.read_done >= 0); | |
c163b5ca | 645 | } |
52e850de | 646 | blk_mig_unlock(); |
c163b5ca | 647 | |
fe80c024 BY |
648 | trace_migration_block_flush_blks("Exit", block_mig_state.submitted, |
649 | block_mig_state.read_done, | |
650 | block_mig_state.transferred); | |
59feec42 | 651 | return ret; |
c163b5ca LS |
652 | } |
653 | ||
a4a411fb | 654 | /* Called with the BQL taken. */ |
32c835ba | 655 | |
889ae39c LS |
656 | static int64_t get_remaining_dirty(void) |
657 | { | |
658 | BlkMigDevState *bmds; | |
659 | int64_t dirty = 0; | |
660 | ||
661 | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { | |
b49f4755 | 662 | bdrv_dirty_bitmap_lock(bmds->dirty_bitmap); |
20dca810 | 663 | dirty += bdrv_get_dirty_count(bmds->dirty_bitmap); |
b49f4755 | 664 | bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap); |
889ae39c LS |
665 | } |
666 | ||
9a46dba7 | 667 | return dirty; |
889ae39c LS |
668 | } |
669 | ||
32c835ba | 670 | |
362fdf17 | 671 | |
a4a411fb | 672 | /* Called with the BQL taken. */ |
362fdf17 | 673 | static void block_migration_cleanup_bmds(void) |
4ec7fcc7 | 674 | { |
82801d8f | 675 | BlkMigDevState *bmds; |
f187609f | 676 | BlockDriverState *bs; |
4ec7fcc7 | 677 | |
e4654d2d | 678 | unset_dirty_tracking(); |
8f794c55 | 679 | |
82801d8f JK |
680 | while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
681 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); | |
f187609f FR |
682 | |
683 | bs = blk_bs(bmds->blk); | |
684 | if (bs) { | |
685 | bdrv_op_unblock_all(bs, bmds->blocker); | |
686 | } | |
3718d8ab | 687 | error_free(bmds->blocker); |
ebd2f9e7 | 688 | blk_unref(bmds->blk); |
ebd2f9e7 | 689 | g_free(bmds->blk_name); |
7267c094 AL |
690 | g_free(bmds->aio_bitmap); |
691 | g_free(bmds); | |
4ec7fcc7 | 692 | } |
362fdf17 KW |
693 | } |
694 | ||
a4a411fb | 695 | /* Called with the BQL taken. */ |
362fdf17 KW |
696 | static void block_migration_cleanup(void *opaque) |
697 | { | |
698 | BlkMigBlock *blk; | |
699 | ||
700 | bdrv_drain_all(); | |
701 | ||
702 | block_migration_cleanup_bmds(); | |
4ec7fcc7 | 703 | |
ef0716df | 704 | blk_mig_lock(); |
82801d8f JK |
705 | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
706 | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); | |
7267c094 AL |
707 | g_free(blk->buf); |
708 | g_free(blk); | |
4ec7fcc7 | 709 | } |
52e850de | 710 | blk_mig_unlock(); |
4ec7fcc7 JK |
711 | } |
712 | ||
01c3ac68 | 713 | static int block_save_setup(QEMUFile *f, void *opaque, Error **errp) |
c163b5ca | 714 | { |
2975725f JQ |
715 | int ret; |
716 | ||
fe80c024 BY |
717 | trace_migration_block_save("setup", block_mig_state.submitted, |
718 | block_mig_state.transferred); | |
a55eb92c | 719 | |
66db46ca JQ |
720 | warn_report("block migration is deprecated;" |
721 | " use blockdev-mirror with NBD instead"); | |
722 | ||
01c3ac68 | 723 | ret = init_blk_migration(f, errp); |
6f5ef23a | 724 | if (ret < 0) { |
6f5ef23a KW |
725 | return ret; |
726 | } | |
d1315aac JQ |
727 | |
728 | /* start track dirty blocks */ | |
b8afb520 | 729 | ret = set_dirty_tracking(); |
b8afb520 | 730 | if (ret) { |
01c3ac68 | 731 | error_setg_errno(errp, -ret, "Failed to start block dirty tracking"); |
b8afb520 FZ |
732 | return ret; |
733 | } | |
734 | ||
59feec42 | 735 | ret = flush_blks(f); |
150da48c | 736 | if (ret) { |
01c3ac68 | 737 | error_setg_errno(errp, -ret, "Flushing block failed"); |
150da48c CLG |
738 | return ret; |
739 | } | |
d1315aac | 740 | blk_mig_reset_dirty_cursor(); |
d1315aac JQ |
741 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
742 | ||
d418cf57 | 743 | return ret; |
d1315aac JQ |
744 | } |
745 | ||
16310a3c | 746 | static int block_save_iterate(QEMUFile *f, void *opaque) |
d1315aac JQ |
747 | { |
748 | int ret; | |
e9c0eed7 | 749 | uint64_t last_bytes = qemu_file_transferred(f); |
d1315aac | 750 | |
fe80c024 BY |
751 | trace_migration_block_save("iterate", block_mig_state.submitted, |
752 | block_mig_state.transferred); | |
d1315aac | 753 | |
59feec42 | 754 | ret = flush_blks(f); |
2975725f | 755 | if (ret) { |
2975725f | 756 | return ret; |
4b640365 JK |
757 | } |
758 | ||
d76cac7d LS |
759 | blk_mig_reset_dirty_cursor(); |
760 | ||
16310a3c | 761 | /* control the rate of transfer */ |
52e850de | 762 | blk_mig_lock(); |
a152bd00 | 763 | while (block_mig_state.read_done * BLK_MIG_BLOCK_SIZE < |
e1fde0e0 | 764 | migration_rate_get() && |
44815334 | 765 | block_mig_state.submitted < MAX_PARALLEL_IO && |
ef9c5160 PL |
766 | (block_mig_state.submitted + block_mig_state.read_done) < |
767 | MAX_IO_BUFFERS) { | |
52e850de | 768 | blk_mig_unlock(); |
16310a3c JQ |
769 | if (block_mig_state.bulk_completed == 0) { |
770 | /* first finish the bulk phase */ | |
771 | if (blk_mig_save_bulked_block(f) == 0) { | |
772 | /* finished saving bulk on all devices */ | |
773 | block_mig_state.bulk_completed = 1; | |
774 | } | |
13197e3c | 775 | ret = 0; |
16310a3c | 776 | } else { |
a4a411fb | 777 | /* Always called with the BQL taken for |
32c835ba PB |
778 | * simplicity, block_save_complete also calls it. |
779 | */ | |
195801d7 | 780 | bql_lock(); |
43be3a25 | 781 | ret = blk_mig_save_dirty_block(f, 1); |
195801d7 | 782 | bql_unlock(); |
13197e3c PB |
783 | } |
784 | if (ret < 0) { | |
785 | return ret; | |
786 | } | |
52e850de | 787 | blk_mig_lock(); |
13197e3c PB |
788 | if (ret != 0) { |
789 | /* no more dirty blocks */ | |
790 | break; | |
a55eb92c | 791 | } |
16310a3c | 792 | } |
52e850de | 793 | blk_mig_unlock(); |
a55eb92c | 794 | |
59feec42 | 795 | ret = flush_blks(f); |
16310a3c | 796 | if (ret) { |
16310a3c | 797 | return ret; |
4b640365 JK |
798 | } |
799 | ||
16310a3c | 800 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
e9c0eed7 | 801 | uint64_t delta_bytes = qemu_file_transferred(f) - last_bytes; |
f3030d34 | 802 | return (delta_bytes > 0); |
16310a3c JQ |
803 | } |
804 | ||
a4a411fb | 805 | /* Called with the BQL taken. */ |
32c835ba | 806 | |
16310a3c JQ |
807 | static int block_save_complete(QEMUFile *f, void *opaque) |
808 | { | |
809 | int ret; | |
810 | ||
fe80c024 BY |
811 | trace_migration_block_save("complete", block_mig_state.submitted, |
812 | block_mig_state.transferred); | |
16310a3c | 813 | |
59feec42 | 814 | ret = flush_blks(f); |
16310a3c | 815 | if (ret) { |
16310a3c JQ |
816 | return ret; |
817 | } | |
a55eb92c | 818 | |
16310a3c | 819 | blk_mig_reset_dirty_cursor(); |
01e61e2d | 820 | |
16310a3c JQ |
821 | /* we know for sure that save bulk is completed and |
822 | all async read completed */ | |
52e850de | 823 | blk_mig_lock(); |
16310a3c | 824 | assert(block_mig_state.submitted == 0); |
52e850de | 825 | blk_mig_unlock(); |
16310a3c | 826 | |
43be3a25 JQ |
827 | do { |
828 | ret = blk_mig_save_dirty_block(f, 0); | |
d418cf57 PB |
829 | if (ret < 0) { |
830 | return ret; | |
831 | } | |
43be3a25 | 832 | } while (ret == 0); |
4b640365 | 833 | |
43be3a25 JQ |
834 | /* report completion */ |
835 | qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS); | |
a55eb92c | 836 | |
fe80c024 | 837 | trace_migration_block_save_complete(); |
16310a3c | 838 | |
a55eb92c JK |
839 | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
840 | ||
362fdf17 KW |
841 | /* Make sure that our BlockBackends are gone, so that the block driver |
842 | * nodes can be inactivated. */ | |
843 | block_migration_cleanup_bmds(); | |
844 | ||
16310a3c | 845 | return 0; |
c163b5ca LS |
846 | } |
847 | ||
24beea4e JQ |
848 | static void block_state_pending(void *opaque, uint64_t *must_precopy, |
849 | uint64_t *can_postcopy) | |
e4ed1541 | 850 | { |
6aaa9dae | 851 | /* Estimate pending number of bytes to send */ |
13197e3c PB |
852 | uint64_t pending; |
853 | ||
195801d7 | 854 | bql_lock(); |
ef0716df | 855 | pending = get_remaining_dirty(); |
195801d7 | 856 | bql_unlock(); |
ef0716df | 857 | |
52e850de | 858 | blk_mig_lock(); |
a152bd00 SH |
859 | pending += block_mig_state.submitted * BLK_MIG_BLOCK_SIZE + |
860 | block_mig_state.read_done * BLK_MIG_BLOCK_SIZE; | |
ef0716df | 861 | blk_mig_unlock(); |
6aaa9dae SH |
862 | |
863 | /* Report at least one block pending during bulk phase */ | |
b5280437 JQ |
864 | if (!pending && !block_mig_state.bulk_completed) { |
865 | pending = BLK_MIG_BLOCK_SIZE; | |
6aaa9dae | 866 | } |
e4ed1541 | 867 | |
c8df4a7a | 868 | trace_migration_block_state_pending(pending); |
c31b098f | 869 | /* We don't do postcopy */ |
24beea4e | 870 | *must_precopy += pending; |
e4ed1541 JQ |
871 | } |
872 | ||
c163b5ca LS |
873 | static int block_load(QEMUFile *f, void *opaque, int version_id) |
874 | { | |
01e61e2d | 875 | static int banner_printed; |
c163b5ca LS |
876 | int len, flags; |
877 | char device_name[256]; | |
878 | int64_t addr; | |
3c254ab8 | 879 | BlockBackend *blk, *blk_prev = NULL; |
9bd9c7f5 | 880 | Error *local_err = NULL; |
c163b5ca | 881 | uint8_t *buf; |
77358b59 PR |
882 | int64_t total_sectors = 0; |
883 | int nr_sectors; | |
42802d47 | 884 | int ret; |
3928d50b | 885 | BlockDriverInfo bdi; |
a152bd00 | 886 | int cluster_size = BLK_MIG_BLOCK_SIZE; |
a55eb92c | 887 | |
c163b5ca | 888 | do { |
c163b5ca | 889 | addr = qemu_get_be64(f); |
a55eb92c | 890 | |
89725715 | 891 | flags = addr & (BDRV_SECTOR_SIZE - 1); |
6ea44308 | 892 | addr >>= BDRV_SECTOR_BITS; |
a55eb92c JK |
893 | |
894 | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { | |
c163b5ca LS |
895 | /* get device name */ |
896 | len = qemu_get_byte(f); | |
c163b5ca LS |
897 | qemu_get_buffer(f, (uint8_t *)device_name, len); |
898 | device_name[len] = '\0'; | |
a55eb92c | 899 | |
c9ebaf74 FZ |
900 | blk = blk_by_name(device_name); |
901 | if (!blk) { | |
4b640365 JK |
902 | fprintf(stderr, "Error unknown block device %s\n", |
903 | device_name); | |
904 | return -EINVAL; | |
905 | } | |
a55eb92c | 906 | |
ad2964b4 KW |
907 | if (blk != blk_prev) { |
908 | blk_prev = blk; | |
909 | total_sectors = blk_nb_sectors(blk); | |
77358b59 | 910 | if (total_sectors <= 0) { |
6daf194d | 911 | error_report("Error getting length of block device %s", |
77358b59 PR |
912 | device_name); |
913 | return -EINVAL; | |
914 | } | |
9bd9c7f5 | 915 | |
3b717194 | 916 | blk_activate(blk, &local_err); |
9bd9c7f5 KW |
917 | if (local_err) { |
918 | error_report_err(local_err); | |
919 | return -EINVAL; | |
920 | } | |
3928d50b LC |
921 | |
922 | ret = bdrv_get_info(blk_bs(blk), &bdi); | |
923 | if (ret == 0 && bdi.cluster_size > 0 && | |
a152bd00 SH |
924 | bdi.cluster_size <= BLK_MIG_BLOCK_SIZE && |
925 | BLK_MIG_BLOCK_SIZE % bdi.cluster_size == 0) { | |
3928d50b LC |
926 | cluster_size = bdi.cluster_size; |
927 | } else { | |
a152bd00 | 928 | cluster_size = BLK_MIG_BLOCK_SIZE; |
3928d50b | 929 | } |
77358b59 PR |
930 | } |
931 | ||
932 | if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) { | |
933 | nr_sectors = total_sectors - addr; | |
934 | } else { | |
935 | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; | |
936 | } | |
937 | ||
323004a3 | 938 | if (flags & BLK_MIG_FLAG_ZERO_BLOCK) { |
ad2964b4 KW |
939 | ret = blk_pwrite_zeroes(blk, addr * BDRV_SECTOR_SIZE, |
940 | nr_sectors * BDRV_SECTOR_SIZE, | |
941 | BDRV_REQ_MAY_UNMAP); | |
323004a3 | 942 | } else { |
3928d50b LC |
943 | int i; |
944 | int64_t cur_addr; | |
945 | uint8_t *cur_buf; | |
946 | ||
a152bd00 SH |
947 | buf = g_malloc(BLK_MIG_BLOCK_SIZE); |
948 | qemu_get_buffer(f, buf, BLK_MIG_BLOCK_SIZE); | |
949 | for (i = 0; i < BLK_MIG_BLOCK_SIZE / cluster_size; i++) { | |
3928d50b LC |
950 | cur_addr = addr * BDRV_SECTOR_SIZE + i * cluster_size; |
951 | cur_buf = buf + i * cluster_size; | |
952 | ||
953 | if ((!block_mig_state.zero_blocks || | |
a152bd00 | 954 | cluster_size < BLK_MIG_BLOCK_SIZE) && |
3928d50b LC |
955 | buffer_is_zero(cur_buf, cluster_size)) { |
956 | ret = blk_pwrite_zeroes(blk, cur_addr, | |
957 | cluster_size, | |
958 | BDRV_REQ_MAY_UNMAP); | |
959 | } else { | |
a9262f55 AF |
960 | ret = blk_pwrite(blk, cur_addr, cluster_size, cur_buf, |
961 | 0); | |
3928d50b LC |
962 | } |
963 | if (ret < 0) { | |
964 | break; | |
965 | } | |
966 | } | |
323004a3 PL |
967 | g_free(buf); |
968 | } | |
575a58d7 | 969 | |
b02bea3a YT |
970 | if (ret < 0) { |
971 | return ret; | |
972 | } | |
01e61e2d JK |
973 | } else if (flags & BLK_MIG_FLAG_PROGRESS) { |
974 | if (!banner_printed) { | |
975 | printf("Receiving block device images\n"); | |
976 | banner_printed = 1; | |
977 | } | |
978 | printf("Completed %d %%%c", (int)addr, | |
979 | (addr == 100) ? '\n' : '\r'); | |
980 | fflush(stdout); | |
a55eb92c | 981 | } else if (!(flags & BLK_MIG_FLAG_EOS)) { |
29fccade | 982 | fprintf(stderr, "Unknown block migration flags: 0x%x\n", flags); |
4b640365 JK |
983 | return -EINVAL; |
984 | } | |
42802d47 JQ |
985 | ret = qemu_file_get_error(f); |
986 | if (ret != 0) { | |
987 | return ret; | |
c163b5ca | 988 | } |
a55eb92c JK |
989 | } while (!(flags & BLK_MIG_FLAG_EOS)); |
990 | ||
c163b5ca LS |
991 | return 0; |
992 | } | |
993 | ||
6bd68781 JQ |
994 | static bool block_is_active(void *opaque) |
995 | { | |
9d4b1e5f | 996 | return migrate_block(); |
6bd68781 JQ |
997 | } |
998 | ||
7a46d042 | 999 | static SaveVMHandlers savevm_block_handlers = { |
9907e842 | 1000 | .save_setup = block_save_setup, |
16310a3c | 1001 | .save_live_iterate = block_save_iterate, |
a3e06c3d | 1002 | .save_live_complete_precopy = block_save_complete, |
c8df4a7a JQ |
1003 | .state_pending_exact = block_state_pending, |
1004 | .state_pending_estimate = block_state_pending, | |
7908c78d | 1005 | .load_state = block_load, |
70f794fc | 1006 | .save_cleanup = block_migration_cleanup, |
6bd68781 | 1007 | .is_active = block_is_active, |
7908c78d JQ |
1008 | }; |
1009 | ||
c163b5ca | 1010 | void blk_mig_init(void) |
a55eb92c | 1011 | { |
5e5328be JK |
1012 | QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
1013 | QSIMPLEQ_INIT(&block_mig_state.blk_list); | |
52e850de | 1014 | qemu_mutex_init(&block_mig_state.lock); |
5e5328be | 1015 | |
ce62df53 | 1016 | register_savevm_live("block", 0, 1, &savevm_block_handlers, |
7908c78d | 1017 | &block_mig_state); |
c163b5ca | 1018 | } |