root / block-migration.c @ 7267c094
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 |
*/
|
13 |
|
14 |
#include "qemu-common.h" |
15 |
#include "block_int.h" |
16 |
#include "hw/hw.h" |
17 |
#include "qemu-queue.h" |
18 |
#include "qemu-timer.h" |
19 |
#include "monitor.h" |
20 |
#include "block-migration.h" |
21 |
#include "migration.h" |
22 |
#include "blockdev.h" |
23 |
#include <assert.h> |
24 |
|
25 |
#define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
|
26 |
|
27 |
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 |
28 |
#define BLK_MIG_FLAG_EOS 0x02 |
29 |
#define BLK_MIG_FLAG_PROGRESS 0x04 |
30 |
|
31 |
#define MAX_IS_ALLOCATED_SEARCH 65536 |
32 |
|
33 |
//#define DEBUG_BLK_MIGRATION
|
34 |
|
35 |
#ifdef DEBUG_BLK_MIGRATION
|
36 |
#define DPRINTF(fmt, ...) \
|
37 |
do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
38 |
#else
|
39 |
#define DPRINTF(fmt, ...) \
|
40 |
do { } while (0) |
41 |
#endif
|
42 |
|
43 |
typedef struct BlkMigDevState { |
44 |
BlockDriverState *bs; |
45 |
int bulk_completed;
|
46 |
int shared_base;
|
47 |
int64_t cur_sector; |
48 |
int64_t cur_dirty; |
49 |
int64_t completed_sectors; |
50 |
int64_t total_sectors; |
51 |
int64_t dirty; |
52 |
QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
53 |
unsigned long *aio_bitmap; |
54 |
} BlkMigDevState; |
55 |
|
56 |
typedef struct BlkMigBlock { |
57 |
uint8_t *buf; |
58 |
BlkMigDevState *bmds; |
59 |
int64_t sector; |
60 |
int nr_sectors;
|
61 |
struct iovec iov;
|
62 |
QEMUIOVector qiov; |
63 |
BlockDriverAIOCB *aiocb; |
64 |
int ret;
|
65 |
QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
66 |
} BlkMigBlock; |
67 |
|
68 |
typedef struct BlkMigState { |
69 |
int blk_enable;
|
70 |
int shared_base;
|
71 |
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
72 |
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; |
73 |
int submitted;
|
74 |
int read_done;
|
75 |
int transferred;
|
76 |
int64_t total_sector_sum; |
77 |
int prev_progress;
|
78 |
int bulk_completed;
|
79 |
long double total_time; |
80 |
long double prev_time_offset; |
81 |
int reads;
|
82 |
} BlkMigState; |
83 |
|
84 |
static BlkMigState block_mig_state;
|
85 |
|
86 |
static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
87 |
{ |
88 |
int len;
|
89 |
|
90 |
/* sector number and flags */
|
91 |
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
92 |
| BLK_MIG_FLAG_DEVICE_BLOCK); |
93 |
|
94 |
/* device name */
|
95 |
len = strlen(blk->bmds->bs->device_name); |
96 |
qemu_put_byte(f, len); |
97 |
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); |
98 |
|
99 |
qemu_put_buffer(f, blk->buf, BLOCK_SIZE); |
100 |
} |
101 |
|
102 |
int blk_mig_active(void) |
103 |
{ |
104 |
return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
|
105 |
} |
106 |
|
107 |
uint64_t blk_mig_bytes_transferred(void)
|
108 |
{ |
109 |
BlkMigDevState *bmds; |
110 |
uint64_t sum = 0;
|
111 |
|
112 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
113 |
sum += bmds->completed_sectors; |
114 |
} |
115 |
return sum << BDRV_SECTOR_BITS;
|
116 |
} |
117 |
|
118 |
uint64_t blk_mig_bytes_remaining(void)
|
119 |
{ |
120 |
return blk_mig_bytes_total() - blk_mig_bytes_transferred();
|
121 |
} |
122 |
|
123 |
uint64_t blk_mig_bytes_total(void)
|
124 |
{ |
125 |
BlkMigDevState *bmds; |
126 |
uint64_t sum = 0;
|
127 |
|
128 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
129 |
sum += bmds->total_sectors; |
130 |
} |
131 |
return sum << BDRV_SECTOR_BITS;
|
132 |
} |
133 |
|
134 |
static inline long double compute_read_bwidth(void) |
135 |
{ |
136 |
assert(block_mig_state.total_time != 0);
|
137 |
return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE;
|
138 |
} |
139 |
|
140 |
static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector) |
141 |
{ |
142 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
143 |
|
144 |
if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) {
|
145 |
return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
146 |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
147 |
} else {
|
148 |
return 0; |
149 |
} |
150 |
} |
151 |
|
152 |
static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num, |
153 |
int nb_sectors, int set) |
154 |
{ |
155 |
int64_t start, end; |
156 |
unsigned long val, idx, bit; |
157 |
|
158 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
159 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
160 |
|
161 |
for (; start <= end; start++) {
|
162 |
idx = start / (sizeof(unsigned long) * 8); |
163 |
bit = start % (sizeof(unsigned long) * 8); |
164 |
val = bmds->aio_bitmap[idx]; |
165 |
if (set) {
|
166 |
val |= 1UL << bit;
|
167 |
} else {
|
168 |
val &= ~(1UL << bit);
|
169 |
} |
170 |
bmds->aio_bitmap[idx] = val; |
171 |
} |
172 |
} |
173 |
|
174 |
static void alloc_aio_bitmap(BlkMigDevState *bmds) |
175 |
{ |
176 |
BlockDriverState *bs = bmds->bs; |
177 |
int64_t bitmap_size; |
178 |
|
179 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
180 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
181 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
182 |
|
183 |
bmds->aio_bitmap = g_malloc0(bitmap_size); |
184 |
} |
185 |
|
186 |
static void blk_mig_read_cb(void *opaque, int ret) |
187 |
{ |
188 |
long double curr_time = qemu_get_clock_ns(rt_clock); |
189 |
BlkMigBlock *blk = opaque; |
190 |
|
191 |
blk->ret = ret; |
192 |
|
193 |
block_mig_state.reads++; |
194 |
block_mig_state.total_time += (curr_time - block_mig_state.prev_time_offset); |
195 |
block_mig_state.prev_time_offset = curr_time; |
196 |
|
197 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
198 |
bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0);
|
199 |
|
200 |
block_mig_state.submitted--; |
201 |
block_mig_state.read_done++; |
202 |
assert(block_mig_state.submitted >= 0);
|
203 |
} |
204 |
|
205 |
static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
206 |
BlkMigDevState *bmds) |
207 |
{ |
208 |
int64_t total_sectors = bmds->total_sectors; |
209 |
int64_t cur_sector = bmds->cur_sector; |
210 |
BlockDriverState *bs = bmds->bs; |
211 |
BlkMigBlock *blk; |
212 |
int nr_sectors;
|
213 |
|
214 |
if (bmds->shared_base) {
|
215 |
while (cur_sector < total_sectors &&
|
216 |
!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
217 |
&nr_sectors)) { |
218 |
cur_sector += nr_sectors; |
219 |
} |
220 |
} |
221 |
|
222 |
if (cur_sector >= total_sectors) {
|
223 |
bmds->cur_sector = bmds->completed_sectors = total_sectors; |
224 |
return 1; |
225 |
} |
226 |
|
227 |
bmds->completed_sectors = cur_sector; |
228 |
|
229 |
cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
|
230 |
|
231 |
/* we are going to transfer a full block even if it is not allocated */
|
232 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
233 |
|
234 |
if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
235 |
nr_sectors = total_sectors - cur_sector; |
236 |
} |
237 |
|
238 |
blk = g_malloc(sizeof(BlkMigBlock));
|
239 |
blk->buf = g_malloc(BLOCK_SIZE); |
240 |
blk->bmds = bmds; |
241 |
blk->sector = cur_sector; |
242 |
blk->nr_sectors = nr_sectors; |
243 |
|
244 |
blk->iov.iov_base = blk->buf; |
245 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
246 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
247 |
|
248 |
if (block_mig_state.submitted == 0) { |
249 |
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); |
250 |
} |
251 |
|
252 |
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
253 |
nr_sectors, blk_mig_read_cb, blk); |
254 |
if (!blk->aiocb) {
|
255 |
goto error;
|
256 |
} |
257 |
block_mig_state.submitted++; |
258 |
|
259 |
bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
260 |
bmds->cur_sector = cur_sector + nr_sectors; |
261 |
|
262 |
return (bmds->cur_sector >= total_sectors);
|
263 |
|
264 |
error:
|
265 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); |
266 |
qemu_file_set_error(f); |
267 |
g_free(blk->buf); |
268 |
g_free(blk); |
269 |
return 0; |
270 |
} |
271 |
|
272 |
static void set_dirty_tracking(int enable) |
273 |
{ |
274 |
BlkMigDevState *bmds; |
275 |
|
276 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
277 |
bdrv_set_dirty_tracking(bmds->bs, enable); |
278 |
} |
279 |
} |
280 |
|
281 |
static void init_blk_migration_it(void *opaque, BlockDriverState *bs) |
282 |
{ |
283 |
Monitor *mon = opaque; |
284 |
BlkMigDevState *bmds; |
285 |
int64_t sectors; |
286 |
|
287 |
if (!bdrv_is_read_only(bs)) {
|
288 |
sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
289 |
if (sectors <= 0) { |
290 |
return;
|
291 |
} |
292 |
|
293 |
bmds = g_malloc0(sizeof(BlkMigDevState));
|
294 |
bmds->bs = bs; |
295 |
bmds->bulk_completed = 0;
|
296 |
bmds->total_sectors = sectors; |
297 |
bmds->completed_sectors = 0;
|
298 |
bmds->shared_base = block_mig_state.shared_base; |
299 |
alloc_aio_bitmap(bmds); |
300 |
drive_get_ref(drive_get_by_blockdev(bs)); |
301 |
bdrv_set_in_use(bs, 1);
|
302 |
|
303 |
block_mig_state.total_sector_sum += sectors; |
304 |
|
305 |
if (bmds->shared_base) {
|
306 |
monitor_printf(mon, "Start migration for %s with shared base "
|
307 |
"image\n",
|
308 |
bs->device_name); |
309 |
} else {
|
310 |
monitor_printf(mon, "Start full migration for %s\n",
|
311 |
bs->device_name); |
312 |
} |
313 |
|
314 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
315 |
} |
316 |
} |
317 |
|
318 |
static void init_blk_migration(Monitor *mon, QEMUFile *f) |
319 |
{ |
320 |
block_mig_state.submitted = 0;
|
321 |
block_mig_state.read_done = 0;
|
322 |
block_mig_state.transferred = 0;
|
323 |
block_mig_state.total_sector_sum = 0;
|
324 |
block_mig_state.prev_progress = -1;
|
325 |
block_mig_state.bulk_completed = 0;
|
326 |
block_mig_state.total_time = 0;
|
327 |
block_mig_state.reads = 0;
|
328 |
|
329 |
bdrv_iterate(init_blk_migration_it, mon); |
330 |
} |
331 |
|
332 |
static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) |
333 |
{ |
334 |
int64_t completed_sector_sum = 0;
|
335 |
BlkMigDevState *bmds; |
336 |
int progress;
|
337 |
int ret = 0; |
338 |
|
339 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
340 |
if (bmds->bulk_completed == 0) { |
341 |
if (mig_save_device_bulk(mon, f, bmds) == 1) { |
342 |
/* completed bulk section for this device */
|
343 |
bmds->bulk_completed = 1;
|
344 |
} |
345 |
completed_sector_sum += bmds->completed_sectors; |
346 |
ret = 1;
|
347 |
break;
|
348 |
} else {
|
349 |
completed_sector_sum += bmds->completed_sectors; |
350 |
} |
351 |
} |
352 |
|
353 |
if (block_mig_state.total_sector_sum != 0) { |
354 |
progress = completed_sector_sum * 100 /
|
355 |
block_mig_state.total_sector_sum; |
356 |
} else {
|
357 |
progress = 100;
|
358 |
} |
359 |
if (progress != block_mig_state.prev_progress) {
|
360 |
block_mig_state.prev_progress = progress; |
361 |
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) |
362 |
| BLK_MIG_FLAG_PROGRESS); |
363 |
monitor_printf(mon, "Completed %d %%\r", progress);
|
364 |
monitor_flush(mon); |
365 |
} |
366 |
|
367 |
return ret;
|
368 |
} |
369 |
|
370 |
static void blk_mig_reset_dirty_cursor(void) |
371 |
{ |
372 |
BlkMigDevState *bmds; |
373 |
|
374 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
375 |
bmds->cur_dirty = 0;
|
376 |
} |
377 |
} |
378 |
|
379 |
static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, |
380 |
BlkMigDevState *bmds, int is_async)
|
381 |
{ |
382 |
BlkMigBlock *blk; |
383 |
int64_t total_sectors = bmds->total_sectors; |
384 |
int64_t sector; |
385 |
int nr_sectors;
|
386 |
|
387 |
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
|
388 |
if (bmds_aio_inflight(bmds, sector)) {
|
389 |
qemu_aio_flush(); |
390 |
} |
391 |
if (bdrv_get_dirty(bmds->bs, sector)) {
|
392 |
|
393 |
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
394 |
nr_sectors = total_sectors - sector; |
395 |
} else {
|
396 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
397 |
} |
398 |
blk = g_malloc(sizeof(BlkMigBlock));
|
399 |
blk->buf = g_malloc(BLOCK_SIZE); |
400 |
blk->bmds = bmds; |
401 |
blk->sector = sector; |
402 |
blk->nr_sectors = nr_sectors; |
403 |
|
404 |
if (is_async) {
|
405 |
blk->iov.iov_base = blk->buf; |
406 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
407 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
408 |
|
409 |
if (block_mig_state.submitted == 0) { |
410 |
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); |
411 |
} |
412 |
|
413 |
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, |
414 |
nr_sectors, blk_mig_read_cb, blk); |
415 |
if (!blk->aiocb) {
|
416 |
goto error;
|
417 |
} |
418 |
block_mig_state.submitted++; |
419 |
bmds_set_aio_inflight(bmds, sector, nr_sectors, 1);
|
420 |
} else {
|
421 |
if (bdrv_read(bmds->bs, sector, blk->buf,
|
422 |
nr_sectors) < 0) {
|
423 |
goto error;
|
424 |
} |
425 |
blk_send(f, blk); |
426 |
|
427 |
g_free(blk->buf); |
428 |
g_free(blk); |
429 |
} |
430 |
|
431 |
bdrv_reset_dirty(bmds->bs, sector, nr_sectors); |
432 |
break;
|
433 |
} |
434 |
sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
435 |
bmds->cur_dirty = sector; |
436 |
} |
437 |
|
438 |
return (bmds->cur_dirty >= bmds->total_sectors);
|
439 |
|
440 |
error:
|
441 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector); |
442 |
qemu_file_set_error(f); |
443 |
g_free(blk->buf); |
444 |
g_free(blk); |
445 |
return 0; |
446 |
} |
447 |
|
448 |
static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async) |
449 |
{ |
450 |
BlkMigDevState *bmds; |
451 |
int ret = 0; |
452 |
|
453 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
454 |
if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) { |
455 |
ret = 1;
|
456 |
break;
|
457 |
} |
458 |
} |
459 |
|
460 |
return ret;
|
461 |
} |
462 |
|
463 |
static void flush_blks(QEMUFile* f) |
464 |
{ |
465 |
BlkMigBlock *blk; |
466 |
|
467 |
DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
|
468 |
__FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, |
469 |
block_mig_state.transferred); |
470 |
|
471 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
472 |
if (qemu_file_rate_limit(f)) {
|
473 |
break;
|
474 |
} |
475 |
if (blk->ret < 0) { |
476 |
qemu_file_set_error(f); |
477 |
break;
|
478 |
} |
479 |
blk_send(f, blk); |
480 |
|
481 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
482 |
g_free(blk->buf); |
483 |
g_free(blk); |
484 |
|
485 |
block_mig_state.read_done--; |
486 |
block_mig_state.transferred++; |
487 |
assert(block_mig_state.read_done >= 0);
|
488 |
} |
489 |
|
490 |
DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
|
491 |
block_mig_state.submitted, block_mig_state.read_done, |
492 |
block_mig_state.transferred); |
493 |
} |
494 |
|
495 |
static int64_t get_remaining_dirty(void) |
496 |
{ |
497 |
BlkMigDevState *bmds; |
498 |
int64_t dirty = 0;
|
499 |
|
500 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
501 |
dirty += bdrv_get_dirty_count(bmds->bs); |
502 |
} |
503 |
|
504 |
return dirty * BLOCK_SIZE;
|
505 |
} |
506 |
|
507 |
static int is_stage2_completed(void) |
508 |
{ |
509 |
int64_t remaining_dirty; |
510 |
long double bwidth; |
511 |
|
512 |
if (block_mig_state.bulk_completed == 1) { |
513 |
|
514 |
remaining_dirty = get_remaining_dirty(); |
515 |
if (remaining_dirty == 0) { |
516 |
return 1; |
517 |
} |
518 |
|
519 |
bwidth = compute_read_bwidth(); |
520 |
|
521 |
if ((remaining_dirty / bwidth) <=
|
522 |
migrate_max_downtime()) { |
523 |
/* finish stage2 because we think that we can finish remaing work
|
524 |
below max_downtime */
|
525 |
|
526 |
return 1; |
527 |
} |
528 |
} |
529 |
|
530 |
return 0; |
531 |
} |
532 |
|
533 |
static void blk_mig_cleanup(Monitor *mon) |
534 |
{ |
535 |
BlkMigDevState *bmds; |
536 |
BlkMigBlock *blk; |
537 |
|
538 |
set_dirty_tracking(0);
|
539 |
|
540 |
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
541 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); |
542 |
bdrv_set_in_use(bmds->bs, 0);
|
543 |
drive_put_ref(drive_get_by_blockdev(bmds->bs)); |
544 |
g_free(bmds->aio_bitmap); |
545 |
g_free(bmds); |
546 |
} |
547 |
|
548 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
549 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
550 |
g_free(blk->buf); |
551 |
g_free(blk); |
552 |
} |
553 |
|
554 |
monitor_printf(mon, "\n");
|
555 |
} |
556 |
|
557 |
static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
558 |
{ |
559 |
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
|
560 |
stage, block_mig_state.submitted, block_mig_state.transferred); |
561 |
|
562 |
if (stage < 0) { |
563 |
blk_mig_cleanup(mon); |
564 |
return 0; |
565 |
} |
566 |
|
567 |
if (block_mig_state.blk_enable != 1) { |
568 |
/* no need to migrate storage */
|
569 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
570 |
return 1; |
571 |
} |
572 |
|
573 |
if (stage == 1) { |
574 |
init_blk_migration(mon, f); |
575 |
|
576 |
/* start track dirty blocks */
|
577 |
set_dirty_tracking(1);
|
578 |
} |
579 |
|
580 |
flush_blks(f); |
581 |
|
582 |
if (qemu_file_has_error(f)) {
|
583 |
blk_mig_cleanup(mon); |
584 |
return 0; |
585 |
} |
586 |
|
587 |
blk_mig_reset_dirty_cursor(); |
588 |
|
589 |
if (stage == 2) { |
590 |
/* control the rate of transfer */
|
591 |
while ((block_mig_state.submitted +
|
592 |
block_mig_state.read_done) * BLOCK_SIZE < |
593 |
qemu_file_get_rate_limit(f)) { |
594 |
if (block_mig_state.bulk_completed == 0) { |
595 |
/* first finish the bulk phase */
|
596 |
if (blk_mig_save_bulked_block(mon, f) == 0) { |
597 |
/* finished saving bulk on all devices */
|
598 |
block_mig_state.bulk_completed = 1;
|
599 |
} |
600 |
} else {
|
601 |
if (blk_mig_save_dirty_block(mon, f, 1) == 0) { |
602 |
/* no more dirty blocks */
|
603 |
break;
|
604 |
} |
605 |
} |
606 |
} |
607 |
|
608 |
flush_blks(f); |
609 |
|
610 |
if (qemu_file_has_error(f)) {
|
611 |
blk_mig_cleanup(mon); |
612 |
return 0; |
613 |
} |
614 |
} |
615 |
|
616 |
if (stage == 3) { |
617 |
/* we know for sure that save bulk is completed and
|
618 |
all async read completed */
|
619 |
assert(block_mig_state.submitted == 0);
|
620 |
|
621 |
while (blk_mig_save_dirty_block(mon, f, 0) != 0); |
622 |
blk_mig_cleanup(mon); |
623 |
|
624 |
/* report completion */
|
625 |
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
|
626 |
|
627 |
if (qemu_file_has_error(f)) {
|
628 |
return 0; |
629 |
} |
630 |
|
631 |
monitor_printf(mon, "Block migration completed\n");
|
632 |
} |
633 |
|
634 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
635 |
|
636 |
return ((stage == 2) && is_stage2_completed()); |
637 |
} |
638 |
|
639 |
static int block_load(QEMUFile *f, void *opaque, int version_id) |
640 |
{ |
641 |
static int banner_printed; |
642 |
int len, flags;
|
643 |
char device_name[256]; |
644 |
int64_t addr; |
645 |
BlockDriverState *bs, *bs_prev = NULL;
|
646 |
uint8_t *buf; |
647 |
int64_t total_sectors = 0;
|
648 |
int nr_sectors;
|
649 |
|
650 |
do {
|
651 |
addr = qemu_get_be64(f); |
652 |
|
653 |
flags = addr & ~BDRV_SECTOR_MASK; |
654 |
addr >>= BDRV_SECTOR_BITS; |
655 |
|
656 |
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
657 |
int ret;
|
658 |
/* get device name */
|
659 |
len = qemu_get_byte(f); |
660 |
qemu_get_buffer(f, (uint8_t *)device_name, len); |
661 |
device_name[len] = '\0';
|
662 |
|
663 |
bs = bdrv_find(device_name); |
664 |
if (!bs) {
|
665 |
fprintf(stderr, "Error unknown block device %s\n",
|
666 |
device_name); |
667 |
return -EINVAL;
|
668 |
} |
669 |
|
670 |
if (bs != bs_prev) {
|
671 |
bs_prev = bs; |
672 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
673 |
if (total_sectors <= 0) { |
674 |
error_report("Error getting length of block device %s",
|
675 |
device_name); |
676 |
return -EINVAL;
|
677 |
} |
678 |
} |
679 |
|
680 |
if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
681 |
nr_sectors = total_sectors - addr; |
682 |
} else {
|
683 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
684 |
} |
685 |
|
686 |
buf = g_malloc(BLOCK_SIZE); |
687 |
|
688 |
qemu_get_buffer(f, buf, BLOCK_SIZE); |
689 |
ret = bdrv_write(bs, addr, buf, nr_sectors); |
690 |
|
691 |
g_free(buf); |
692 |
if (ret < 0) { |
693 |
return ret;
|
694 |
} |
695 |
} else if (flags & BLK_MIG_FLAG_PROGRESS) { |
696 |
if (!banner_printed) {
|
697 |
printf("Receiving block device images\n");
|
698 |
banner_printed = 1;
|
699 |
} |
700 |
printf("Completed %d %%%c", (int)addr, |
701 |
(addr == 100) ? '\n' : '\r'); |
702 |
fflush(stdout); |
703 |
} else if (!(flags & BLK_MIG_FLAG_EOS)) { |
704 |
fprintf(stderr, "Unknown flags\n");
|
705 |
return -EINVAL;
|
706 |
} |
707 |
if (qemu_file_has_error(f)) {
|
708 |
return -EIO;
|
709 |
} |
710 |
} while (!(flags & BLK_MIG_FLAG_EOS));
|
711 |
|
712 |
return 0; |
713 |
} |
714 |
|
715 |
static void block_set_params(int blk_enable, int shared_base, void *opaque) |
716 |
{ |
717 |
block_mig_state.blk_enable = blk_enable; |
718 |
block_mig_state.shared_base = shared_base; |
719 |
|
720 |
/* shared base means that blk_enable = 1 */
|
721 |
block_mig_state.blk_enable |= shared_base; |
722 |
} |
723 |
|
724 |
void blk_mig_init(void) |
725 |
{ |
726 |
QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
727 |
QSIMPLEQ_INIT(&block_mig_state.blk_list); |
728 |
|
729 |
register_savevm_live(NULL, "block", 0, 1, block_set_params, |
730 |
block_save_live, NULL, block_load, &block_mig_state);
|
731 |
} |