root / block-migration.c @ d246673d
History | View | Annotate | Download (16.8 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 <assert.h> |
23 |
|
24 |
#define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
|
25 |
|
26 |
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 |
27 |
#define BLK_MIG_FLAG_EOS 0x02 |
28 |
#define BLK_MIG_FLAG_PROGRESS 0x04 |
29 |
|
30 |
#define MAX_IS_ALLOCATED_SEARCH 65536 |
31 |
|
32 |
//#define DEBUG_BLK_MIGRATION
|
33 |
|
34 |
#ifdef DEBUG_BLK_MIGRATION
|
35 |
#define DPRINTF(fmt, ...) \
|
36 |
do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
37 |
#else
|
38 |
#define DPRINTF(fmt, ...) \
|
39 |
do { } while (0) |
40 |
#endif
|
41 |
|
42 |
typedef struct BlkMigDevState { |
43 |
BlockDriverState *bs; |
44 |
int bulk_completed;
|
45 |
int shared_base;
|
46 |
int64_t cur_sector; |
47 |
int64_t cur_dirty; |
48 |
int64_t completed_sectors; |
49 |
int64_t total_sectors; |
50 |
int64_t dirty; |
51 |
QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
52 |
} BlkMigDevState; |
53 |
|
54 |
typedef struct BlkMigBlock { |
55 |
uint8_t *buf; |
56 |
BlkMigDevState *bmds; |
57 |
int64_t sector; |
58 |
struct iovec iov;
|
59 |
QEMUIOVector qiov; |
60 |
BlockDriverAIOCB *aiocb; |
61 |
int ret;
|
62 |
int64_t time; |
63 |
QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
64 |
} BlkMigBlock; |
65 |
|
66 |
typedef struct BlkMigState { |
67 |
int blk_enable;
|
68 |
int shared_base;
|
69 |
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
70 |
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; |
71 |
int submitted;
|
72 |
int read_done;
|
73 |
int transferred;
|
74 |
int64_t total_sector_sum; |
75 |
int prev_progress;
|
76 |
int bulk_completed;
|
77 |
long double total_time; |
78 |
int reads;
|
79 |
} BlkMigState; |
80 |
|
81 |
static BlkMigState block_mig_state;
|
82 |
|
83 |
static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
84 |
{ |
85 |
int len;
|
86 |
|
87 |
/* sector number and flags */
|
88 |
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
89 |
| BLK_MIG_FLAG_DEVICE_BLOCK); |
90 |
|
91 |
/* device name */
|
92 |
len = strlen(blk->bmds->bs->device_name); |
93 |
qemu_put_byte(f, len); |
94 |
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); |
95 |
|
96 |
qemu_put_buffer(f, blk->buf, BLOCK_SIZE); |
97 |
} |
98 |
|
99 |
int blk_mig_active(void) |
100 |
{ |
101 |
return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
|
102 |
} |
103 |
|
104 |
uint64_t blk_mig_bytes_transferred(void)
|
105 |
{ |
106 |
BlkMigDevState *bmds; |
107 |
uint64_t sum = 0;
|
108 |
|
109 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
110 |
sum += bmds->completed_sectors; |
111 |
} |
112 |
return sum << BDRV_SECTOR_BITS;
|
113 |
} |
114 |
|
115 |
uint64_t blk_mig_bytes_remaining(void)
|
116 |
{ |
117 |
return blk_mig_bytes_total() - blk_mig_bytes_transferred();
|
118 |
} |
119 |
|
120 |
uint64_t blk_mig_bytes_total(void)
|
121 |
{ |
122 |
BlkMigDevState *bmds; |
123 |
uint64_t sum = 0;
|
124 |
|
125 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
126 |
sum += bmds->total_sectors; |
127 |
} |
128 |
return sum << BDRV_SECTOR_BITS;
|
129 |
} |
130 |
|
131 |
static inline void add_avg_read_time(int64_t time) |
132 |
{ |
133 |
block_mig_state.reads++; |
134 |
block_mig_state.total_time += time; |
135 |
} |
136 |
|
137 |
static inline long double compute_read_bwidth(void) |
138 |
{ |
139 |
assert(block_mig_state.total_time != 0);
|
140 |
return (block_mig_state.reads * BLOCK_SIZE)/ block_mig_state.total_time;
|
141 |
} |
142 |
|
143 |
static void blk_mig_read_cb(void *opaque, int ret) |
144 |
{ |
145 |
BlkMigBlock *blk = opaque; |
146 |
|
147 |
blk->ret = ret; |
148 |
|
149 |
blk->time = qemu_get_clock_ns(rt_clock) - blk->time; |
150 |
|
151 |
add_avg_read_time(blk->time); |
152 |
|
153 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
154 |
|
155 |
block_mig_state.submitted--; |
156 |
block_mig_state.read_done++; |
157 |
assert(block_mig_state.submitted >= 0);
|
158 |
} |
159 |
|
160 |
static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
161 |
BlkMigDevState *bmds) |
162 |
{ |
163 |
int64_t total_sectors = bmds->total_sectors; |
164 |
int64_t cur_sector = bmds->cur_sector; |
165 |
BlockDriverState *bs = bmds->bs; |
166 |
BlkMigBlock *blk; |
167 |
int nr_sectors;
|
168 |
|
169 |
if (bmds->shared_base) {
|
170 |
while (cur_sector < total_sectors &&
|
171 |
!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
172 |
&nr_sectors)) { |
173 |
cur_sector += nr_sectors; |
174 |
} |
175 |
} |
176 |
|
177 |
if (cur_sector >= total_sectors) {
|
178 |
bmds->cur_sector = bmds->completed_sectors = total_sectors; |
179 |
return 1; |
180 |
} |
181 |
|
182 |
bmds->completed_sectors = cur_sector; |
183 |
|
184 |
cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
|
185 |
|
186 |
/* we are going to transfer a full block even if it is not allocated */
|
187 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
188 |
|
189 |
if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
190 |
nr_sectors = total_sectors - cur_sector; |
191 |
} |
192 |
|
193 |
blk = qemu_malloc(sizeof(BlkMigBlock));
|
194 |
blk->buf = qemu_malloc(BLOCK_SIZE); |
195 |
blk->bmds = bmds; |
196 |
blk->sector = cur_sector; |
197 |
|
198 |
blk->iov.iov_base = blk->buf; |
199 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
200 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
201 |
|
202 |
blk->time = qemu_get_clock_ns(rt_clock); |
203 |
|
204 |
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
205 |
nr_sectors, blk_mig_read_cb, blk); |
206 |
if (!blk->aiocb) {
|
207 |
goto error;
|
208 |
} |
209 |
block_mig_state.submitted++; |
210 |
|
211 |
bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
212 |
bmds->cur_sector = cur_sector + nr_sectors; |
213 |
|
214 |
return (bmds->cur_sector >= total_sectors);
|
215 |
|
216 |
error:
|
217 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); |
218 |
qemu_file_set_error(f); |
219 |
qemu_free(blk->buf); |
220 |
qemu_free(blk); |
221 |
return 0; |
222 |
} |
223 |
|
224 |
static void set_dirty_tracking(int enable) |
225 |
{ |
226 |
BlkMigDevState *bmds; |
227 |
|
228 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
229 |
bdrv_set_dirty_tracking(bmds->bs, enable); |
230 |
} |
231 |
} |
232 |
|
233 |
static void init_blk_migration_it(void *opaque, BlockDriverState *bs) |
234 |
{ |
235 |
Monitor *mon = opaque; |
236 |
BlkMigDevState *bmds; |
237 |
int64_t sectors; |
238 |
|
239 |
if (!bdrv_is_read_only(bs)) {
|
240 |
sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
241 |
if (sectors == 0) { |
242 |
return;
|
243 |
} |
244 |
|
245 |
bmds = qemu_mallocz(sizeof(BlkMigDevState));
|
246 |
bmds->bs = bs; |
247 |
bmds->bulk_completed = 0;
|
248 |
bmds->total_sectors = sectors; |
249 |
bmds->completed_sectors = 0;
|
250 |
bmds->shared_base = block_mig_state.shared_base; |
251 |
|
252 |
block_mig_state.total_sector_sum += sectors; |
253 |
|
254 |
if (bmds->shared_base) {
|
255 |
monitor_printf(mon, "Start migration for %s with shared base "
|
256 |
"image\n",
|
257 |
bs->device_name); |
258 |
} else {
|
259 |
monitor_printf(mon, "Start full migration for %s\n",
|
260 |
bs->device_name); |
261 |
} |
262 |
|
263 |
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
264 |
} |
265 |
} |
266 |
|
267 |
static void init_blk_migration(Monitor *mon, QEMUFile *f) |
268 |
{ |
269 |
block_mig_state.submitted = 0;
|
270 |
block_mig_state.read_done = 0;
|
271 |
block_mig_state.transferred = 0;
|
272 |
block_mig_state.total_sector_sum = 0;
|
273 |
block_mig_state.prev_progress = -1;
|
274 |
block_mig_state.bulk_completed = 0;
|
275 |
block_mig_state.total_time = 0;
|
276 |
block_mig_state.reads = 0;
|
277 |
|
278 |
bdrv_iterate(init_blk_migration_it, mon); |
279 |
} |
280 |
|
281 |
static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) |
282 |
{ |
283 |
int64_t completed_sector_sum = 0;
|
284 |
BlkMigDevState *bmds; |
285 |
int progress;
|
286 |
int ret = 0; |
287 |
|
288 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
289 |
if (bmds->bulk_completed == 0) { |
290 |
if (mig_save_device_bulk(mon, f, bmds) == 1) { |
291 |
/* completed bulk section for this device */
|
292 |
bmds->bulk_completed = 1;
|
293 |
} |
294 |
completed_sector_sum += bmds->completed_sectors; |
295 |
ret = 1;
|
296 |
break;
|
297 |
} else {
|
298 |
completed_sector_sum += bmds->completed_sectors; |
299 |
} |
300 |
} |
301 |
|
302 |
progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum;
|
303 |
if (progress != block_mig_state.prev_progress) {
|
304 |
block_mig_state.prev_progress = progress; |
305 |
qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) |
306 |
| BLK_MIG_FLAG_PROGRESS); |
307 |
monitor_printf(mon, "Completed %d %%\r", progress);
|
308 |
monitor_flush(mon); |
309 |
} |
310 |
|
311 |
return ret;
|
312 |
} |
313 |
|
314 |
static void blk_mig_reset_dirty_cursor(void) |
315 |
{ |
316 |
BlkMigDevState *bmds; |
317 |
|
318 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
319 |
bmds->cur_dirty = 0;
|
320 |
} |
321 |
} |
322 |
|
323 |
static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, |
324 |
BlkMigDevState *bmds, int is_async)
|
325 |
{ |
326 |
BlkMigBlock *blk; |
327 |
int64_t total_sectors = bmds->total_sectors; |
328 |
int64_t sector; |
329 |
int nr_sectors;
|
330 |
|
331 |
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
|
332 |
if (bdrv_get_dirty(bmds->bs, sector)) {
|
333 |
|
334 |
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
|
335 |
nr_sectors = total_sectors - sector; |
336 |
} else {
|
337 |
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
338 |
} |
339 |
blk = qemu_malloc(sizeof(BlkMigBlock));
|
340 |
blk->buf = qemu_malloc(BLOCK_SIZE); |
341 |
blk->bmds = bmds; |
342 |
blk->sector = sector; |
343 |
|
344 |
if (is_async) {
|
345 |
blk->iov.iov_base = blk->buf; |
346 |
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
347 |
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
|
348 |
|
349 |
blk->time = qemu_get_clock_ns(rt_clock); |
350 |
|
351 |
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, |
352 |
nr_sectors, blk_mig_read_cb, blk); |
353 |
if (!blk->aiocb) {
|
354 |
goto error;
|
355 |
} |
356 |
block_mig_state.submitted++; |
357 |
} else {
|
358 |
if (bdrv_read(bmds->bs, sector, blk->buf,
|
359 |
nr_sectors) < 0) {
|
360 |
goto error;
|
361 |
} |
362 |
blk_send(f, blk); |
363 |
|
364 |
qemu_free(blk->buf); |
365 |
qemu_free(blk); |
366 |
} |
367 |
|
368 |
bdrv_reset_dirty(bmds->bs, sector, nr_sectors); |
369 |
break;
|
370 |
} |
371 |
sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
372 |
bmds->cur_dirty = sector; |
373 |
} |
374 |
|
375 |
return (bmds->cur_dirty >= bmds->total_sectors);
|
376 |
|
377 |
error:
|
378 |
monitor_printf(mon, "Error reading sector %" PRId64 "\n", sector); |
379 |
qemu_file_set_error(f); |
380 |
qemu_free(blk->buf); |
381 |
qemu_free(blk); |
382 |
return 0; |
383 |
} |
384 |
|
385 |
static int blk_mig_save_dirty_block(Monitor *mon, QEMUFile *f, int is_async) |
386 |
{ |
387 |
BlkMigDevState *bmds; |
388 |
int ret = 0; |
389 |
|
390 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
391 |
if (mig_save_device_dirty(mon, f, bmds, is_async) == 0) { |
392 |
ret = 1;
|
393 |
break;
|
394 |
} |
395 |
} |
396 |
|
397 |
return ret;
|
398 |
} |
399 |
|
400 |
static void flush_blks(QEMUFile* f) |
401 |
{ |
402 |
BlkMigBlock *blk; |
403 |
|
404 |
DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
|
405 |
__FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, |
406 |
block_mig_state.transferred); |
407 |
|
408 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
409 |
if (qemu_file_rate_limit(f)) {
|
410 |
break;
|
411 |
} |
412 |
if (blk->ret < 0) { |
413 |
qemu_file_set_error(f); |
414 |
break;
|
415 |
} |
416 |
blk_send(f, blk); |
417 |
|
418 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
419 |
qemu_free(blk->buf); |
420 |
qemu_free(blk); |
421 |
|
422 |
block_mig_state.read_done--; |
423 |
block_mig_state.transferred++; |
424 |
assert(block_mig_state.read_done >= 0);
|
425 |
} |
426 |
|
427 |
DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
|
428 |
block_mig_state.submitted, block_mig_state.read_done, |
429 |
block_mig_state.transferred); |
430 |
} |
431 |
|
432 |
static int64_t get_remaining_dirty(void) |
433 |
{ |
434 |
BlkMigDevState *bmds; |
435 |
int64_t dirty = 0;
|
436 |
|
437 |
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
438 |
dirty += bdrv_get_dirty_count(bmds->bs); |
439 |
} |
440 |
|
441 |
return dirty * BLOCK_SIZE;
|
442 |
} |
443 |
|
444 |
static int is_stage2_completed(void) |
445 |
{ |
446 |
int64_t remaining_dirty; |
447 |
long double bwidth; |
448 |
|
449 |
if (block_mig_state.bulk_completed == 1) { |
450 |
|
451 |
remaining_dirty = get_remaining_dirty(); |
452 |
if (remaining_dirty == 0) { |
453 |
return 1; |
454 |
} |
455 |
|
456 |
bwidth = compute_read_bwidth(); |
457 |
|
458 |
if ((remaining_dirty / bwidth) <=
|
459 |
migrate_max_downtime()) { |
460 |
/* finish stage2 because we think that we can finish remaing work
|
461 |
below max_downtime */
|
462 |
|
463 |
return 1; |
464 |
} |
465 |
} |
466 |
|
467 |
return 0; |
468 |
} |
469 |
|
470 |
static void blk_mig_cleanup(Monitor *mon) |
471 |
{ |
472 |
BlkMigDevState *bmds; |
473 |
BlkMigBlock *blk; |
474 |
|
475 |
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
476 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); |
477 |
qemu_free(bmds); |
478 |
} |
479 |
|
480 |
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
481 |
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
482 |
qemu_free(blk->buf); |
483 |
qemu_free(blk); |
484 |
} |
485 |
|
486 |
set_dirty_tracking(0);
|
487 |
|
488 |
monitor_printf(mon, "\n");
|
489 |
} |
490 |
|
491 |
static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
492 |
{ |
493 |
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
|
494 |
stage, block_mig_state.submitted, block_mig_state.transferred); |
495 |
|
496 |
if (stage < 0) { |
497 |
blk_mig_cleanup(mon); |
498 |
return 0; |
499 |
} |
500 |
|
501 |
if (block_mig_state.blk_enable != 1) { |
502 |
/* no need to migrate storage */
|
503 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
504 |
return 1; |
505 |
} |
506 |
|
507 |
if (stage == 1) { |
508 |
init_blk_migration(mon, f); |
509 |
|
510 |
/* start track dirty blocks */
|
511 |
set_dirty_tracking(1);
|
512 |
} |
513 |
|
514 |
flush_blks(f); |
515 |
|
516 |
if (qemu_file_has_error(f)) {
|
517 |
blk_mig_cleanup(mon); |
518 |
return 0; |
519 |
} |
520 |
|
521 |
blk_mig_reset_dirty_cursor(); |
522 |
|
523 |
if (stage == 2) { |
524 |
/* control the rate of transfer */
|
525 |
while ((block_mig_state.submitted +
|
526 |
block_mig_state.read_done) * BLOCK_SIZE < |
527 |
qemu_file_get_rate_limit(f)) { |
528 |
if (block_mig_state.bulk_completed == 0) { |
529 |
/* first finish the bulk phase */
|
530 |
if (blk_mig_save_bulked_block(mon, f) == 0) { |
531 |
/* finished saving bulk on all devices */
|
532 |
block_mig_state.bulk_completed = 1;
|
533 |
} |
534 |
} else {
|
535 |
if (blk_mig_save_dirty_block(mon, f, 1) == 0) { |
536 |
/* no more dirty blocks */
|
537 |
break;
|
538 |
} |
539 |
} |
540 |
} |
541 |
|
542 |
flush_blks(f); |
543 |
|
544 |
if (qemu_file_has_error(f)) {
|
545 |
blk_mig_cleanup(mon); |
546 |
return 0; |
547 |
} |
548 |
} |
549 |
|
550 |
if (stage == 3) { |
551 |
/* we know for sure that save bulk is completed and
|
552 |
all async read completed */
|
553 |
assert(block_mig_state.submitted == 0);
|
554 |
|
555 |
while (blk_mig_save_dirty_block(mon, f, 0) != 0); |
556 |
blk_mig_cleanup(mon); |
557 |
|
558 |
/* report completion */
|
559 |
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
|
560 |
|
561 |
if (qemu_file_has_error(f)) {
|
562 |
return 0; |
563 |
} |
564 |
|
565 |
monitor_printf(mon, "Block migration completed\n");
|
566 |
} |
567 |
|
568 |
qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
569 |
|
570 |
return ((stage == 2) && is_stage2_completed()); |
571 |
} |
572 |
|
573 |
static int block_load(QEMUFile *f, void *opaque, int version_id) |
574 |
{ |
575 |
static int banner_printed; |
576 |
int len, flags;
|
577 |
char device_name[256]; |
578 |
int64_t addr; |
579 |
BlockDriverState *bs; |
580 |
uint8_t *buf; |
581 |
|
582 |
do {
|
583 |
addr = qemu_get_be64(f); |
584 |
|
585 |
flags = addr & ~BDRV_SECTOR_MASK; |
586 |
addr >>= BDRV_SECTOR_BITS; |
587 |
|
588 |
if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
589 |
/* get device name */
|
590 |
len = qemu_get_byte(f); |
591 |
qemu_get_buffer(f, (uint8_t *)device_name, len); |
592 |
device_name[len] = '\0';
|
593 |
|
594 |
bs = bdrv_find(device_name); |
595 |
if (!bs) {
|
596 |
fprintf(stderr, "Error unknown block device %s\n",
|
597 |
device_name); |
598 |
return -EINVAL;
|
599 |
} |
600 |
|
601 |
buf = qemu_malloc(BLOCK_SIZE); |
602 |
|
603 |
qemu_get_buffer(f, buf, BLOCK_SIZE); |
604 |
bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); |
605 |
|
606 |
qemu_free(buf); |
607 |
} else if (flags & BLK_MIG_FLAG_PROGRESS) { |
608 |
if (!banner_printed) {
|
609 |
printf("Receiving block device images\n");
|
610 |
banner_printed = 1;
|
611 |
} |
612 |
printf("Completed %d %%%c", (int)addr, |
613 |
(addr == 100) ? '\n' : '\r'); |
614 |
fflush(stdout); |
615 |
} else if (!(flags & BLK_MIG_FLAG_EOS)) { |
616 |
fprintf(stderr, "Unknown flags\n");
|
617 |
return -EINVAL;
|
618 |
} |
619 |
if (qemu_file_has_error(f)) {
|
620 |
return -EIO;
|
621 |
} |
622 |
} while (!(flags & BLK_MIG_FLAG_EOS));
|
623 |
|
624 |
return 0; |
625 |
} |
626 |
|
627 |
static void block_set_params(int blk_enable, int shared_base, void *opaque) |
628 |
{ |
629 |
block_mig_state.blk_enable = blk_enable; |
630 |
block_mig_state.shared_base = shared_base; |
631 |
|
632 |
/* shared base means that blk_enable = 1 */
|
633 |
block_mig_state.blk_enable |= shared_base; |
634 |
} |
635 |
|
636 |
void blk_mig_init(void) |
637 |
{ |
638 |
QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
639 |
QSIMPLEQ_INIT(&block_mig_state.blk_list); |
640 |
|
641 |
register_savevm_live("block", 0, 1, block_set_params, block_save_live, |
642 |
NULL, block_load, &block_mig_state);
|
643 |
} |