root / block-migration.c @ 60e1b2a6
History | View | Annotate | Download (19.7 kB)
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 |
* Contributions after 2012-01-13 are licensed under the terms of the
|
13 |
* GNU GPL, version 2 or (at your option) any later version.
|
14 |
*/
|
15 |
|
16 |
#include "qemu-common.h" |
17 |
#include "block_int.h" |
18 |
#include "hw/hw.h" |
19 |
#include "qemu-queue.h" |
20 |
#include "qemu-timer.h" |
21 |
#include "monitor.h" |
22 |
#include "block-migration.h" |
23 |
#include "migration.h" |
24 |
#include "blockdev.h" |
25 |
#include <assert.h> |
26 |
|
27 |
#define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
|
28 |
|
29 |
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 |
30 |
#define BLK_MIG_FLAG_EOS 0x02 |
31 |
#define BLK_MIG_FLAG_PROGRESS 0x04 |
32 |
|
33 |
#define MAX_IS_ALLOCATED_SEARCH 65536 |
34 |
|
35 |
//#define DEBUG_BLK_MIGRATION
|
36 |
|
37 |
#ifdef DEBUG_BLK_MIGRATION
|
38 |
#define DPRINTF(fmt, ...) \
|
39 |
do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
40 |
#else
|
41 |
#define DPRINTF(fmt, ...) \
|
42 |
do { } while (0) |
43 |
#endif
|
44 |
|
45 |
typedef struct BlkMigDevState { |
46 |
BlockDriverState *bs; |
47 |
int bulk_completed;
|
48 |
int shared_base;
|
49 |
int64_t cur_sector; |
50 |
int64_t cur_dirty; |
51 |
int64_t completed_sectors; |
52 |
int64_t total_sectors; |
53 |
int64_t dirty; |
54 |
QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
55 |
unsigned long *aio_bitmap; |
56 |
} BlkMigDevState; |
57 |
|
58 |
typedef struct BlkMigBlock { |
59 |
uint8_t *buf; |
60 |
BlkMigDevState *bmds; |
61 |
int64_t sector; |
62 |
int nr_sectors;
|
63 |
struct iovec iov;
|
64 |
QEMUIOVector qiov; |
65 |
BlockDriverAIOCB *aiocb; |
66 |
int ret;
|
67 |
QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
68 |
} BlkMigBlock; |
69 |
|
70 |
typedef struct BlkMigState { |
71 |
int blk_enable;
|
72 |
int shared_base;
|
73 |
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
74 |
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; |
75 |
int submitted;
|
76 |
int read_done;
|
77 |
int transferred;
|
78 |
int64_t total_sector_sum; |
79 |
int prev_progress;
|
80 |
int bulk_completed;
|
81 |
long double total_time; |
82 |
long double prev_time_offset; |
83 |
int reads;
|
84 |
} BlkMigState; |
85 |
|
86 |
static BlkMigState block_mig_state;
|
87 |
|
88 |
static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
89 |
{ |
90 |
int len;
|
91 |
|
92 |
/* sector number and flags */
|
93 |
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
94 |
| BLK_MIG_FLAG_DEVICE_BLOCK); |
95 |
|
96 |
/* device name */
|
97 |
len = strlen(blk->bmds->bs->device_name); |
98 |
qemu_put_byte(f, len); |
99 |
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); |
100 |
|
101 |
qemu_put_buffer(f, blk->buf, BLOCK_SIZE); |
102 |
} |
103 |
|
104 |
int blk_mig_active(void) |
105 |
{ |
106 |
return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
|
107 |
} |
108 |
|
109 |
uint64_t blk_mig_bytes_transferred(void)
|
110 |
{ |
111 |
BlkMigDevState *bmds; |
112 |
uint64_t sum = 0;
|
113 |
|
114 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
115 |
sum += bmds->completed_sectors; |
116 |
} |
117 |
return sum << BDRV_SECTOR_BITS;
|
118 |
} |
119 |
|
120 |
uint64_t blk_mig_bytes_remaining(void)
|
121 |
{ |
122 |
return blk_mig_bytes_total() - blk_mig_bytes_transferred();
|
123 |
} |
124 |
|
125 |
uint64_t blk_mig_bytes_total(void)
|
126 |
{ |
127 |
BlkMigDevState *bmds; |
128 |
uint64_t sum = 0;
|
129 |
|
130 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
131 |
sum += bmds->total_sectors; |
132 |
} |
133 |
return sum << BDRV_SECTOR_BITS;
|
134 |
} |
135 |
|
136 |
static inline long double compute_read_bwidth(void) |
137 |
{ |
138 |
assert(block_mig_state.total_time != 0);
|
139 |
return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE;
|
140 |
} |
141 |
|
142 |
static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector) |
143 |
{ |
144 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
145 |
|
146 |
if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) {
|
147 |
return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
148 |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
149 |
} else {
|
150 |
return 0; |
151 |
} |
152 |
} |
153 |
|
154 |
static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num, |
155 |
int nb_sectors, int set) |
156 |
{ |
157 |
int64_t start, end; |
158 |
unsigned long val, idx, bit; |
159 |
|
160 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
161 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
162 |
|
163 |
for (; start <= end; start++) {
|
164 |
idx = start / (sizeof(unsigned long) * 8); |
165 |
bit = start % (sizeof(unsigned long) * 8); |
166 |
val = bmds->aio_bitmap[idx]; |
167 |
if (set) {
|
168 |
val |= 1UL << bit;
|
169 |
} else {
|
170 |
val &= ~(1UL << bit);
|
171 |
} |
172 |
bmds->aio_bitmap[idx] = val; |
173 |
} |
174 |
} |
175 |
|
176 |
static void alloc_aio_bitmap(BlkMigDevState *bmds) |
177 |
{ |
178 |
BlockDriverState *bs = bmds->bs; |
179 |
int64_t bitmap_size; |
180 |
|
181 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
182 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
183 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
184 |
|
185 |
bmds->aio_bitmap = g_malloc0(bitmap_size); |
186 |
} |
187 |
|
188 |
static void blk_mig_read_cb(void *opaque, int ret) |
189 |
{ |
190 |
long double curr_time = qemu_get_clock_ns(rt_clock); |
191 |
BlkMigBlock *blk = opaque; |
192 |
|
193 |
blk->ret = ret; |
194 |
|
195 |
block_mig_state.reads++; |
196 |
block_mig_state.total_time += (curr_time - block_mig_state.prev_time_offset); |
197 |
block_mig_state.prev_time_offset = curr_time; |
198 |
|
199 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
200 |
bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0);
|
201 |
|
202 |
block_mig_state.submitted--; |
203 |
block_mig_state.read_done++; |
204 |
assert(block_mig_state.submitted >= 0);
|
205 |
} |
206 |
|
207 |
static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
208 |
BlkMigDevState *bmds) |
209 |
{ |
210 |
int64_t total_sectors = bmds->total_sectors; |
211 |
int64_t cur_sector = bmds->cur_sector; |
212 |
BlockDriverState *bs = bmds->bs; |
213 |
BlkMigBlock *blk; |
214 |
int nr_sectors;
|
215 |
|
216 |
if (bmds->shared_base) {
|
217 |
while (cur_sector < total_sectors &&
|
218 |
!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
219 |
&nr_sectors)) { |
220 |
cur_sector += nr_sectors; |
221 |
} |
222 |
} |
223 |
|
224 |
if (cur_sector >= total_sectors) {
|
225 |
bmds->cur_sector = bmds->completed_sectors = total_sectors; |
226 |
return 1; |
227 |
} |
228 |
|
229 |
bmds->completed_sectors = cur_sector; |
230 |
|
231 |
cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
|
232 |
|
233 |
/* we are going to transfer a full block even if it is not allocated */
|
234 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
235 |
|
236 |
if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
237 |
nr_sectors = total_sectors - cur_sector; |
238 |
} |
239 |
|
240 |
blk = g_malloc(sizeof(BlkMigBlock));
|
241 |
blk->buf = g_malloc(BLOCK_SIZE); |
242 |
blk->bmds = bmds; |
243 |
blk->sector = cur_sector; |
244 |
blk->nr_sectors = nr_sectors; |
245 |
|
246 |
blk->iov.iov_base = blk->buf; |
247 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
248 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
249 |
|
250 |
if (block_mig_state.submitted == 0) { |
251 |
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); |
252 |
} |
253 |
|
254 |
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
255 |
nr_sectors, blk_mig_read_cb, blk); |
256 |
block_mig_state.submitted++; |
257 |
|
258 |
bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
259 |
bmds->cur_sector = cur_sector + nr_sectors; |
260 |
|
261 |
return (bmds->cur_sector >= total_sectors);
|
262 |
} |
263 |
|
264 |
static void set_dirty_tracking(int enable) |
265 |
{ |
266 |
BlkMigDevState *bmds; |
267 |
|
268 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
269 |
bdrv_set_dirty_tracking(bmds->bs, enable); |
270 |
} |
271 |
} |
272 |
|
273 |
static void init_blk_migration_it(void *opaque, BlockDriverState *bs) |
274 |
{ |
275 |
Monitor *mon = opaque; |
276 |
BlkMigDevState *bmds; |
277 |
int64_t sectors; |
278 |
|
279 |
if (!bdrv_is_read_only(bs)) {
|
280 |
sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
281 |
if (sectors <= 0) { |
282 |
return;
|
283 |
} |
284 |
|
285 |
bmds = g_malloc0(sizeof(BlkMigDevState));
|
286 |
bmds->bs = bs; |
287 |
bmds->bulk_completed = 0;
|
288 |
bmds->total_sectors = sectors; |
289 |
bmds->completed_sectors = 0;
|
290 |
bmds->shared_base = block_mig_state.shared_base; |
291 |
alloc_aio_bitmap(bmds); |
292 |
drive_get_ref(drive_get_by_blockdev(bs)); |
293 |
bdrv_set_in_use(bs, 1);
|
294 |
|
295 |
block_mig_state.total_sector_sum += sectors; |
296 |
|
297 |
if (bmds->shared_base) {
|
298 |
monitor_printf(mon, "Start migration for %s with shared base "
|
299 |
"image\n",
|
300 |
bs->device_name); |
301 |
} else {
|
302 |
monitor_printf(mon, "Start full migration for %s\n",
|
303 |
bs->device_name); |
304 |
} |
305 |
|
306 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
307 |
} |
308 |
} |
309 |
|
310 |
static void init_blk_migration(Monitor *mon, QEMUFile *f) |
311 |
{ |
312 |
block_mig_state.submitted = 0;
|
313 |
block_mig_state.read_done = 0;
|
314 |
block_mig_state.transferred = 0;
|
315 |
block_mig_state.total_sector_sum = 0;
|
316 |
block_mig_state.prev_progress = -1;
|
317 |
block_mig_state.bulk_completed = 0;
|
318 |
block_mig_state.total_time = 0;
|
319 |
block_mig_state.reads = 0;
|
320 |
|
321 |
bdrv_iterate(init_blk_migration_it, mon); |
322 |
} |
323 |
|
324 |
static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) |
325 |
{ |
326 |
int64_t completed_sector_sum = 0;
|
327 |
BlkMigDevState *bmds; |
328 |
int progress;
|
329 |
int ret = 0; |
330 |
|
331 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
332 |
if (bmds->bulk_completed == 0) { |
333 |
if (mig_save_device_bulk(mon, f, bmds) == 1) { |
334 |
/* completed bulk section for this device */
|
335 |
bmds->bulk_completed = 1;
|
336 |
} |
337 |
completed_sector_sum += bmds->completed_sectors; |
338 |
ret = 1;
|
339 |
break;
|
340 |
} else {
|
341 |
completed_sector_sum += bmds->completed_sectors; |
342 |
} |
343 |
} |
344 |
|
345 |
if (block_mig_state.total_sector_sum != 0) { |
346 |
progress = completed_sector_sum * 100 /
|
347 |
block_mig_state.total_sector_sum; |
348 |
} else {
|
349 |
progress = 100;
|
350 |
} |
351 |
if (progress != block_mig_state.prev_progress) {
|
352 |
block_mig_state.prev_progress = progress; |
353 |
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) |
354 |
| BLK_MIG_FLAG_PROGRESS); |
355 |
monitor_printf(mon, "Completed %d %%\r", progress);
|
356 |
monitor_flush(mon); |
357 |
} |
358 |
|
359 |
return ret;
|
360 |
} |
361 |
|
362 |
static void blk_mig_reset_dirty_cursor(void) |
363 |
{ |
364 |
BlkMigDevState *bmds; |
365 |
|
366 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
367 |
bmds->cur_dirty = 0;
|
368 |
} |
369 |
} |
370 |
|
371 |
static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, |
372 |
BlkMigDevState *bmds, int is_async)
|
373 |
{ |
374 |
BlkMigBlock *blk; |
375 |
int64_t total_sectors = bmds->total_sectors; |
376 |
int64_t sector; |
377 |
int nr_sectors;
|
378 |
int ret = -EIO;
|
379 |
|
380 |
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
|
381 |
if (bmds_aio_inflight(bmds, sector)) {
|
382 |
bdrv_drain_all(); |
383 |
} |
384 |
if (bdrv_get_dirty(bmds->bs, sector)) {
|
385 |
|
386 |
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
387 |
nr_sectors = total_sectors - sector; |
388 |
} else {
|
389 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
390 |
} |
391 |
blk = g_malloc(sizeof(BlkMigBlock));
|
392 |
blk->buf = g_malloc(BLOCK_SIZE); |
393 |
blk->bmds = bmds; |
394 |
blk->sector = sector; |
395 |
blk->nr_sectors = nr_sectors; |
396 |
|
397 |
if (is_async) {
|
398 |
blk->iov.iov_base = blk->buf; |
399 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
400 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
401 |
|
402 |
if (block_mig_state.submitted == 0) { |
403 |
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); |
404 |
} |
405 |
|
406 |
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, |
407 |
nr_sectors, blk_mig_read_cb, blk); |
408 |
block_mig_state.submitted++; |
409 |
bmds_set_aio_inflight(bmds, sector, nr_sectors, 1);
|
410 |
} else {
|
411 |
ret = bdrv_read(bmds->bs, sector, blk->buf, nr_sectors); |
412 |
if (ret < 0) { |
413 |
goto error;
|
414 |
} |
415 |
blk_send(f, blk); |
416 |
|
417 |
g_free(blk->buf); |
418 |
g_free(blk); |
419 |
} |
420 |
|
421 |
bdrv_reset_dirty(bmds->bs, sector, nr_sectors); |
422 |
break;
|
423 |
} |
424 |
sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
425 |
bmds->cur_dirty = sector; |
426 |
} |
427 |
|
428 |
return (bmds->cur_dirty >= bmds->total_sectors);
|
429 |
|
430 |
error:
|
431 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector); |
432 |
qemu_file_set_error(f, ret); |
433 |
g_free(blk->buf); |
434 |
g_free(blk); |
435 |
return 0; |
436 |
} |
437 |
|
438 |
static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async) |
439 |
{ |
440 |
BlkMigDevState *bmds; |
441 |
int ret = 0; |
442 |
|
443 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
444 |
if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) { |
445 |
ret = 1;
|
446 |
break;
|
447 |
} |
448 |
} |
449 |
|
450 |
return ret;
|
451 |
} |
452 |
|
453 |
static void flush_blks(QEMUFile* f) |
454 |
{ |
455 |
BlkMigBlock *blk; |
456 |
|
457 |
DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
|
458 |
__FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, |
459 |
block_mig_state.transferred); |
460 |
|
461 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
462 |
if (qemu_file_rate_limit(f)) {
|
463 |
break;
|
464 |
} |
465 |
if (blk->ret < 0) { |
466 |
qemu_file_set_error(f, blk->ret); |
467 |
break;
|
468 |
} |
469 |
blk_send(f, blk); |
470 |
|
471 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
472 |
g_free(blk->buf); |
473 |
g_free(blk); |
474 |
|
475 |
block_mig_state.read_done--; |
476 |
block_mig_state.transferred++; |
477 |
assert(block_mig_state.read_done >= 0);
|
478 |
} |
479 |
|
480 |
DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
|
481 |
block_mig_state.submitted, block_mig_state.read_done, |
482 |
block_mig_state.transferred); |
483 |
} |
484 |
|
485 |
static int64_t get_remaining_dirty(void) |
486 |
{ |
487 |
BlkMigDevState *bmds; |
488 |
int64_t dirty = 0;
|
489 |
|
490 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
491 |
dirty += bdrv_get_dirty_count(bmds->bs); |
492 |
} |
493 |
|
494 |
return dirty * BLOCK_SIZE;
|
495 |
} |
496 |
|
497 |
static int is_stage2_completed(void) |
498 |
{ |
499 |
int64_t remaining_dirty; |
500 |
long double bwidth; |
501 |
|
502 |
if (block_mig_state.bulk_completed == 1) { |
503 |
|
504 |
remaining_dirty = get_remaining_dirty(); |
505 |
if (remaining_dirty == 0) { |
506 |
return 1; |
507 |
} |
508 |
|
509 |
bwidth = compute_read_bwidth(); |
510 |
|
511 |
if ((remaining_dirty / bwidth) <=
|
512 |
migrate_max_downtime()) { |
513 |
/* finish stage2 because we think that we can finish remaining work
|
514 |
below max_downtime */
|
515 |
|
516 |
return 1; |
517 |
} |
518 |
} |
519 |
|
520 |
return 0; |
521 |
} |
522 |
|
523 |
static void blk_mig_cleanup(Monitor *mon) |
524 |
{ |
525 |
BlkMigDevState *bmds; |
526 |
BlkMigBlock *blk; |
527 |
|
528 |
set_dirty_tracking(0);
|
529 |
|
530 |
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
531 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); |
532 |
bdrv_set_in_use(bmds->bs, 0);
|
533 |
drive_put_ref(drive_get_by_blockdev(bmds->bs)); |
534 |
g_free(bmds->aio_bitmap); |
535 |
g_free(bmds); |
536 |
} |
537 |
|
538 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
539 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
540 |
g_free(blk->buf); |
541 |
g_free(blk); |
542 |
} |
543 |
|
544 |
monitor_printf(mon, "\n");
|
545 |
} |
546 |
|
547 |
static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
548 |
{ |
549 |
int ret;
|
550 |
|
551 |
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
|
552 |
stage, block_mig_state.submitted, block_mig_state.transferred); |
553 |
|
554 |
if (stage < 0) { |
555 |
blk_mig_cleanup(mon); |
556 |
return 0; |
557 |
} |
558 |
|
559 |
if (block_mig_state.blk_enable != 1) { |
560 |
/* no need to migrate storage */
|
561 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
562 |
return 1; |
563 |
} |
564 |
|
565 |
if (stage == 1) { |
566 |
init_blk_migration(mon, f); |
567 |
|
568 |
/* start track dirty blocks */
|
569 |
set_dirty_tracking(1);
|
570 |
} |
571 |
|
572 |
flush_blks(f); |
573 |
|
574 |
ret = qemu_file_get_error(f); |
575 |
if (ret) {
|
576 |
blk_mig_cleanup(mon); |
577 |
return ret;
|
578 |
} |
579 |
|
580 |
blk_mig_reset_dirty_cursor(); |
581 |
|
582 |
if (stage == 2) { |
583 |
/* control the rate of transfer */
|
584 |
while ((block_mig_state.submitted +
|
585 |
block_mig_state.read_done) * BLOCK_SIZE < |
586 |
qemu_file_get_rate_limit(f)) { |
587 |
if (block_mig_state.bulk_completed == 0) { |
588 |
/* first finish the bulk phase */
|
589 |
if (blk_mig_save_bulked_block(mon, f) == 0) { |
590 |
/* finished saving bulk on all devices */
|
591 |
block_mig_state.bulk_completed = 1;
|
592 |
} |
593 |
} else {
|
594 |
if (blk_mig_save_dirty_block(mon, f, 1) == 0) { |
595 |
/* no more dirty blocks */
|
596 |
break;
|
597 |
} |
598 |
} |
599 |
} |
600 |
|
601 |
flush_blks(f); |
602 |
|
603 |
ret = qemu_file_get_error(f); |
604 |
if (ret) {
|
605 |
blk_mig_cleanup(mon); |
606 |
return ret;
|
607 |
} |
608 |
} |
609 |
|
610 |
if (stage == 3) { |
611 |
/* we know for sure that save bulk is completed and
|
612 |
all async read completed */
|
613 |
assert(block_mig_state.submitted == 0);
|
614 |
|
615 |
while (blk_mig_save_dirty_block(mon, f, 0) != 0); |
616 |
blk_mig_cleanup(mon); |
617 |
|
618 |
/* report completion */
|
619 |
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
|
620 |
|
621 |
ret = qemu_file_get_error(f); |
622 |
if (ret) {
|
623 |
return ret;
|
624 |
} |
625 |
|
626 |
monitor_printf(mon, "Block migration completed\n");
|
627 |
} |
628 |
|
629 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
630 |
|
631 |
return ((stage == 2) && is_stage2_completed()); |
632 |
} |
633 |
|
634 |
static int block_load(QEMUFile *f, void *opaque, int version_id) |
635 |
{ |
636 |
static int banner_printed; |
637 |
int len, flags;
|
638 |
char device_name[256]; |
639 |
int64_t addr; |
640 |
BlockDriverState *bs, *bs_prev = NULL;
|
641 |
uint8_t *buf; |
642 |
int64_t total_sectors = 0;
|
643 |
int nr_sectors;
|
644 |
int ret;
|
645 |
|
646 |
do {
|
647 |
addr = qemu_get_be64(f); |
648 |
|
649 |
flags = addr & ~BDRV_SECTOR_MASK; |
650 |
addr >>= BDRV_SECTOR_BITS; |
651 |
|
652 |
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
653 |
/* get device name */
|
654 |
len = qemu_get_byte(f); |
655 |
qemu_get_buffer(f, (uint8_t *)device_name, len); |
656 |
device_name[len] = '\0';
|
657 |
|
658 |
bs = bdrv_find(device_name); |
659 |
if (!bs) {
|
660 |
fprintf(stderr, "Error unknown block device %s\n",
|
661 |
device_name); |
662 |
return -EINVAL;
|
663 |
} |
664 |
|
665 |
if (bs != bs_prev) {
|
666 |
bs_prev = bs; |
667 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
668 |
if (total_sectors <= 0) { |
669 |
error_report("Error getting length of block device %s",
|
670 |
device_name); |
671 |
return -EINVAL;
|
672 |
} |
673 |
} |
674 |
|
675 |
if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
676 |
nr_sectors = total_sectors - addr; |
677 |
} else {
|
678 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
679 |
} |
680 |
|
681 |
buf = g_malloc(BLOCK_SIZE); |
682 |
|
683 |
qemu_get_buffer(f, buf, BLOCK_SIZE); |
684 |
ret = bdrv_write(bs, addr, buf, nr_sectors); |
685 |
|
686 |
g_free(buf); |
687 |
if (ret < 0) { |
688 |
return ret;
|
689 |
} |
690 |
} else if (flags & BLK_MIG_FLAG_PROGRESS) { |
691 |
if (!banner_printed) {
|
692 |
printf("Receiving block device images\n");
|
693 |
banner_printed = 1;
|
694 |
} |
695 |
printf("Completed %d %%%c", (int)addr, |
696 |
(addr == 100) ? '\n' : '\r'); |
697 |
fflush(stdout); |
698 |
} else if (!(flags & BLK_MIG_FLAG_EOS)) { |
699 |
fprintf(stderr, "Unknown flags\n");
|
700 |
return -EINVAL;
|
701 |
} |
702 |
ret = qemu_file_get_error(f); |
703 |
if (ret != 0) { |
704 |
return ret;
|
705 |
} |
706 |
} while (!(flags & BLK_MIG_FLAG_EOS));
|
707 |
|
708 |
return 0; |
709 |
} |
710 |
|
711 |
static void block_set_params(int blk_enable, int shared_base, void *opaque) |
712 |
{ |
713 |
block_mig_state.blk_enable = blk_enable; |
714 |
block_mig_state.shared_base = shared_base; |
715 |
|
716 |
/* shared base means that blk_enable = 1 */
|
717 |
block_mig_state.blk_enable |= shared_base; |
718 |
} |
719 |
|
720 |
void blk_mig_init(void) |
721 |
{ |
722 |
QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
723 |
QSIMPLEQ_INIT(&block_mig_state.blk_list); |
724 |
|
725 |
register_savevm_live(NULL, "block", 0, 1, block_set_params, |
726 |
block_save_live, NULL, block_load, &block_mig_state);
|
727 |
} |