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b35ebdf0 VSO |
1 | /* |
2 | * Block dirty bitmap postcopy migration | |
3 | * | |
4 | * Copyright IBM, Corp. 2009 | |
5 | * Copyright (c) 2016-2017 Virtuozzo International GmbH. All rights reserved. | |
6 | * | |
7 | * Authors: | |
8 | * Liran Schour <lirans@il.ibm.com> | |
9 | * Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | |
10 | * | |
11 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
12 | * the COPYING file in the top-level directory. | |
13 | * This file is derived from migration/block.c, so it's author and IBM copyright | |
14 | * are here, although content is quite different. | |
15 | * | |
16 | * Contributions after 2012-01-13 are licensed under the terms of the | |
17 | * GNU GPL, version 2 or (at your option) any later version. | |
18 | * | |
19 | * *** | |
20 | * | |
21 | * Here postcopy migration of dirty bitmaps is realized. Only QMP-addressable | |
22 | * bitmaps are migrated. | |
23 | * | |
24 | * Bitmap migration implies creating bitmap with the same name and granularity | |
25 | * in destination QEMU. If the bitmap with the same name (for the same node) | |
26 | * already exists on destination an error will be generated. | |
27 | * | |
28 | * format of migration: | |
29 | * | |
30 | * # Header (shared for different chunk types) | |
31 | * 1, 2 or 4 bytes: flags (see qemu_{put,put}_flags) | |
32 | * [ 1 byte: node name size ] \ flags & DEVICE_NAME | |
33 | * [ n bytes: node name ] / | |
34 | * [ 1 byte: bitmap name size ] \ flags & BITMAP_NAME | |
35 | * [ n bytes: bitmap name ] / | |
36 | * | |
37 | * # Start of bitmap migration (flags & START) | |
38 | * header | |
39 | * be64: granularity | |
40 | * 1 byte: bitmap flags (corresponds to BdrvDirtyBitmap) | |
41 | * bit 0 - bitmap is enabled | |
42 | * bit 1 - bitmap is persistent | |
43 | * bit 2 - bitmap is autoloading | |
44 | * bits 3-7 - reserved, must be zero | |
45 | * | |
46 | * # Complete of bitmap migration (flags & COMPLETE) | |
47 | * header | |
48 | * | |
49 | * # Data chunk of bitmap migration | |
50 | * header | |
51 | * be64: start sector | |
52 | * be32: number of sectors | |
53 | * [ be64: buffer size ] \ ! (flags & ZEROES) | |
54 | * [ n bytes: buffer ] / | |
55 | * | |
56 | * The last chunk in stream should contain flags & EOS. The chunk may skip | |
57 | * device and/or bitmap names, assuming them to be the same with the previous | |
58 | * chunk. | |
59 | */ | |
60 | ||
61 | #include "qemu/osdep.h" | |
62 | #include "block/block.h" | |
63 | #include "block/block_int.h" | |
64 | #include "sysemu/block-backend.h" | |
65 | #include "qemu/main-loop.h" | |
66 | #include "qemu/error-report.h" | |
67 | #include "migration/misc.h" | |
68 | #include "migration/migration.h" | |
53d37d36 | 69 | #include "qemu-file.h" |
b35ebdf0 VSO |
70 | #include "migration/vmstate.h" |
71 | #include "migration/register.h" | |
72 | #include "qemu/hbitmap.h" | |
73 | #include "sysemu/sysemu.h" | |
74 | #include "qemu/cutils.h" | |
75 | #include "qapi/error.h" | |
76 | #include "trace.h" | |
77 | ||
78 | #define CHUNK_SIZE (1 << 10) | |
79 | ||
80 | /* Flags occupy one, two or four bytes (Big Endian). The size is determined as | |
81 | * follows: | |
82 | * in first (most significant) byte bit 8 is clear --> one byte | |
83 | * in first byte bit 8 is set --> two or four bytes, depending on second | |
84 | * byte: | |
85 | * | in second byte bit 8 is clear --> two bytes | |
86 | * | in second byte bit 8 is set --> four bytes | |
87 | */ | |
88 | #define DIRTY_BITMAP_MIG_FLAG_EOS 0x01 | |
89 | #define DIRTY_BITMAP_MIG_FLAG_ZEROES 0x02 | |
90 | #define DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME 0x04 | |
91 | #define DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME 0x08 | |
92 | #define DIRTY_BITMAP_MIG_FLAG_START 0x10 | |
93 | #define DIRTY_BITMAP_MIG_FLAG_COMPLETE 0x20 | |
94 | #define DIRTY_BITMAP_MIG_FLAG_BITS 0x40 | |
95 | ||
96 | #define DIRTY_BITMAP_MIG_EXTRA_FLAGS 0x80 | |
97 | ||
98 | #define DIRTY_BITMAP_MIG_START_FLAG_ENABLED 0x01 | |
99 | #define DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT 0x02 | |
100 | /* 0x04 was "AUTOLOAD" flags on elder versions, no it is ignored */ | |
101 | #define DIRTY_BITMAP_MIG_START_FLAG_RESERVED_MASK 0xf8 | |
102 | ||
103 | typedef struct DirtyBitmapMigBitmapState { | |
104 | /* Written during setup phase. */ | |
105 | BlockDriverState *bs; | |
106 | const char *node_name; | |
107 | BdrvDirtyBitmap *bitmap; | |
108 | uint64_t total_sectors; | |
109 | uint64_t sectors_per_chunk; | |
110 | QSIMPLEQ_ENTRY(DirtyBitmapMigBitmapState) entry; | |
111 | uint8_t flags; | |
112 | ||
113 | /* For bulk phase. */ | |
114 | bool bulk_completed; | |
115 | uint64_t cur_sector; | |
116 | } DirtyBitmapMigBitmapState; | |
117 | ||
118 | typedef struct DirtyBitmapMigState { | |
b58deb34 | 119 | QSIMPLEQ_HEAD(, DirtyBitmapMigBitmapState) dbms_list; |
b35ebdf0 VSO |
120 | |
121 | bool bulk_completed; | |
122 | bool no_bitmaps; | |
123 | ||
124 | /* for send_bitmap_bits() */ | |
125 | BlockDriverState *prev_bs; | |
126 | BdrvDirtyBitmap *prev_bitmap; | |
127 | } DirtyBitmapMigState; | |
128 | ||
129 | typedef struct DirtyBitmapLoadState { | |
130 | uint32_t flags; | |
131 | char node_name[256]; | |
132 | char bitmap_name[256]; | |
133 | BlockDriverState *bs; | |
134 | BdrvDirtyBitmap *bitmap; | |
135 | } DirtyBitmapLoadState; | |
136 | ||
137 | static DirtyBitmapMigState dirty_bitmap_mig_state; | |
138 | ||
139 | typedef struct DirtyBitmapLoadBitmapState { | |
140 | BlockDriverState *bs; | |
141 | BdrvDirtyBitmap *bitmap; | |
142 | bool migrated; | |
143 | } DirtyBitmapLoadBitmapState; | |
144 | static GSList *enabled_bitmaps; | |
145 | QemuMutex finish_lock; | |
146 | ||
147 | void init_dirty_bitmap_incoming_migration(void) | |
148 | { | |
149 | qemu_mutex_init(&finish_lock); | |
150 | } | |
151 | ||
152 | static uint32_t qemu_get_bitmap_flags(QEMUFile *f) | |
153 | { | |
154 | uint8_t flags = qemu_get_byte(f); | |
155 | if (flags & DIRTY_BITMAP_MIG_EXTRA_FLAGS) { | |
156 | flags = flags << 8 | qemu_get_byte(f); | |
157 | if (flags & DIRTY_BITMAP_MIG_EXTRA_FLAGS) { | |
158 | flags = flags << 16 | qemu_get_be16(f); | |
159 | } | |
160 | } | |
161 | ||
162 | return flags; | |
163 | } | |
164 | ||
165 | static void qemu_put_bitmap_flags(QEMUFile *f, uint32_t flags) | |
166 | { | |
167 | /* The code currently do not send flags more than one byte */ | |
168 | assert(!(flags & (0xffffff00 | DIRTY_BITMAP_MIG_EXTRA_FLAGS))); | |
169 | ||
170 | qemu_put_byte(f, flags); | |
171 | } | |
172 | ||
173 | static void send_bitmap_header(QEMUFile *f, DirtyBitmapMigBitmapState *dbms, | |
174 | uint32_t additional_flags) | |
175 | { | |
176 | BlockDriverState *bs = dbms->bs; | |
177 | BdrvDirtyBitmap *bitmap = dbms->bitmap; | |
178 | uint32_t flags = additional_flags; | |
179 | trace_send_bitmap_header_enter(); | |
180 | ||
181 | if (bs != dirty_bitmap_mig_state.prev_bs) { | |
182 | dirty_bitmap_mig_state.prev_bs = bs; | |
183 | flags |= DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME; | |
184 | } | |
185 | ||
186 | if (bitmap != dirty_bitmap_mig_state.prev_bitmap) { | |
187 | dirty_bitmap_mig_state.prev_bitmap = bitmap; | |
188 | flags |= DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME; | |
189 | } | |
190 | ||
191 | qemu_put_bitmap_flags(f, flags); | |
192 | ||
193 | if (flags & DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME) { | |
194 | qemu_put_counted_string(f, dbms->node_name); | |
195 | } | |
196 | ||
197 | if (flags & DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME) { | |
198 | qemu_put_counted_string(f, bdrv_dirty_bitmap_name(bitmap)); | |
199 | } | |
200 | } | |
201 | ||
202 | static void send_bitmap_start(QEMUFile *f, DirtyBitmapMigBitmapState *dbms) | |
203 | { | |
204 | send_bitmap_header(f, dbms, DIRTY_BITMAP_MIG_FLAG_START); | |
205 | qemu_put_be32(f, bdrv_dirty_bitmap_granularity(dbms->bitmap)); | |
206 | qemu_put_byte(f, dbms->flags); | |
207 | } | |
208 | ||
209 | static void send_bitmap_complete(QEMUFile *f, DirtyBitmapMigBitmapState *dbms) | |
210 | { | |
211 | send_bitmap_header(f, dbms, DIRTY_BITMAP_MIG_FLAG_COMPLETE); | |
212 | } | |
213 | ||
214 | static void send_bitmap_bits(QEMUFile *f, DirtyBitmapMigBitmapState *dbms, | |
215 | uint64_t start_sector, uint32_t nr_sectors) | |
216 | { | |
217 | /* align for buffer_is_zero() */ | |
218 | uint64_t align = 4 * sizeof(long); | |
219 | uint64_t unaligned_size = | |
220 | bdrv_dirty_bitmap_serialization_size( | |
221 | dbms->bitmap, start_sector << BDRV_SECTOR_BITS, | |
222 | (uint64_t)nr_sectors << BDRV_SECTOR_BITS); | |
223 | uint64_t buf_size = QEMU_ALIGN_UP(unaligned_size, align); | |
224 | uint8_t *buf = g_malloc0(buf_size); | |
225 | uint32_t flags = DIRTY_BITMAP_MIG_FLAG_BITS; | |
226 | ||
227 | bdrv_dirty_bitmap_serialize_part( | |
228 | dbms->bitmap, buf, start_sector << BDRV_SECTOR_BITS, | |
229 | (uint64_t)nr_sectors << BDRV_SECTOR_BITS); | |
230 | ||
231 | if (buffer_is_zero(buf, buf_size)) { | |
232 | g_free(buf); | |
233 | buf = NULL; | |
234 | flags |= DIRTY_BITMAP_MIG_FLAG_ZEROES; | |
235 | } | |
236 | ||
237 | trace_send_bitmap_bits(flags, start_sector, nr_sectors, buf_size); | |
238 | ||
239 | send_bitmap_header(f, dbms, flags); | |
240 | ||
241 | qemu_put_be64(f, start_sector); | |
242 | qemu_put_be32(f, nr_sectors); | |
243 | ||
244 | /* if a block is zero we need to flush here since the network | |
245 | * bandwidth is now a lot higher than the storage device bandwidth. | |
246 | * thus if we queue zero blocks we slow down the migration. */ | |
247 | if (flags & DIRTY_BITMAP_MIG_FLAG_ZEROES) { | |
248 | qemu_fflush(f); | |
249 | } else { | |
250 | qemu_put_be64(f, buf_size); | |
251 | qemu_put_buffer(f, buf, buf_size); | |
252 | } | |
253 | ||
254 | g_free(buf); | |
255 | } | |
256 | ||
257 | /* Called with iothread lock taken. */ | |
258 | static void dirty_bitmap_mig_cleanup(void) | |
259 | { | |
260 | DirtyBitmapMigBitmapState *dbms; | |
261 | ||
262 | while ((dbms = QSIMPLEQ_FIRST(&dirty_bitmap_mig_state.dbms_list)) != NULL) { | |
263 | QSIMPLEQ_REMOVE_HEAD(&dirty_bitmap_mig_state.dbms_list, entry); | |
27a1b301 | 264 | bdrv_dirty_bitmap_set_busy(dbms->bitmap, false); |
b35ebdf0 VSO |
265 | bdrv_unref(dbms->bs); |
266 | g_free(dbms); | |
267 | } | |
268 | } | |
269 | ||
270 | /* Called with iothread lock taken. */ | |
271 | static int init_dirty_bitmap_migration(void) | |
272 | { | |
273 | BlockDriverState *bs; | |
274 | BdrvDirtyBitmap *bitmap; | |
275 | DirtyBitmapMigBitmapState *dbms; | |
276 | BdrvNextIterator it; | |
3ae96d66 | 277 | Error *local_err = NULL; |
b35ebdf0 VSO |
278 | |
279 | dirty_bitmap_mig_state.bulk_completed = false; | |
280 | dirty_bitmap_mig_state.prev_bs = NULL; | |
281 | dirty_bitmap_mig_state.prev_bitmap = NULL; | |
282 | dirty_bitmap_mig_state.no_bitmaps = false; | |
283 | ||
284 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { | |
285 | const char *drive_name = bdrv_get_device_or_node_name(bs); | |
286 | ||
287 | /* skip automatically inserted nodes */ | |
288 | while (bs && bs->drv && bs->implicit) { | |
289 | bs = backing_bs(bs); | |
290 | } | |
291 | ||
292 | for (bitmap = bdrv_dirty_bitmap_next(bs, NULL); bitmap; | |
293 | bitmap = bdrv_dirty_bitmap_next(bs, bitmap)) | |
294 | { | |
295 | if (!bdrv_dirty_bitmap_name(bitmap)) { | |
296 | continue; | |
297 | } | |
298 | ||
299 | if (drive_name == NULL) { | |
300 | error_report("Found bitmap '%s' in unnamed node %p. It can't " | |
301 | "be migrated", bdrv_dirty_bitmap_name(bitmap), bs); | |
302 | goto fail; | |
303 | } | |
304 | ||
3ae96d66 JS |
305 | if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, |
306 | &local_err)) { | |
307 | error_report_err(local_err); | |
9c98f145 VSO |
308 | goto fail; |
309 | } | |
310 | ||
b35ebdf0 | 311 | bdrv_ref(bs); |
27a1b301 | 312 | bdrv_dirty_bitmap_set_busy(bitmap, true); |
b35ebdf0 VSO |
313 | |
314 | dbms = g_new0(DirtyBitmapMigBitmapState, 1); | |
315 | dbms->bs = bs; | |
316 | dbms->node_name = drive_name; | |
317 | dbms->bitmap = bitmap; | |
318 | dbms->total_sectors = bdrv_nb_sectors(bs); | |
319 | dbms->sectors_per_chunk = CHUNK_SIZE * 8 * | |
320 | bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS; | |
321 | if (bdrv_dirty_bitmap_enabled(bitmap)) { | |
322 | dbms->flags |= DIRTY_BITMAP_MIG_START_FLAG_ENABLED; | |
323 | } | |
796a3798 | 324 | if (bdrv_dirty_bitmap_get_persistence(bitmap)) { |
b35ebdf0 VSO |
325 | dbms->flags |= DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT; |
326 | } | |
327 | ||
328 | QSIMPLEQ_INSERT_TAIL(&dirty_bitmap_mig_state.dbms_list, | |
329 | dbms, entry); | |
330 | } | |
331 | } | |
332 | ||
9c98f145 | 333 | /* unset migration flags here, to not roll back it */ |
b35ebdf0 | 334 | QSIMPLEQ_FOREACH(dbms, &dirty_bitmap_mig_state.dbms_list, entry) { |
9c98f145 | 335 | bdrv_dirty_bitmap_set_migration(dbms->bitmap, true); |
b35ebdf0 VSO |
336 | } |
337 | ||
338 | if (QSIMPLEQ_EMPTY(&dirty_bitmap_mig_state.dbms_list)) { | |
339 | dirty_bitmap_mig_state.no_bitmaps = true; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | ||
344 | fail: | |
345 | dirty_bitmap_mig_cleanup(); | |
346 | ||
347 | return -1; | |
348 | } | |
349 | ||
350 | /* Called with no lock taken. */ | |
351 | static void bulk_phase_send_chunk(QEMUFile *f, DirtyBitmapMigBitmapState *dbms) | |
352 | { | |
353 | uint32_t nr_sectors = MIN(dbms->total_sectors - dbms->cur_sector, | |
354 | dbms->sectors_per_chunk); | |
355 | ||
356 | send_bitmap_bits(f, dbms, dbms->cur_sector, nr_sectors); | |
357 | ||
358 | dbms->cur_sector += nr_sectors; | |
359 | if (dbms->cur_sector >= dbms->total_sectors) { | |
360 | dbms->bulk_completed = true; | |
361 | } | |
362 | } | |
363 | ||
364 | /* Called with no lock taken. */ | |
365 | static void bulk_phase(QEMUFile *f, bool limit) | |
366 | { | |
367 | DirtyBitmapMigBitmapState *dbms; | |
368 | ||
369 | QSIMPLEQ_FOREACH(dbms, &dirty_bitmap_mig_state.dbms_list, entry) { | |
370 | while (!dbms->bulk_completed) { | |
371 | bulk_phase_send_chunk(f, dbms); | |
372 | if (limit && qemu_file_rate_limit(f)) { | |
373 | return; | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | dirty_bitmap_mig_state.bulk_completed = true; | |
379 | } | |
380 | ||
381 | /* for SaveVMHandlers */ | |
382 | static void dirty_bitmap_save_cleanup(void *opaque) | |
383 | { | |
384 | dirty_bitmap_mig_cleanup(); | |
385 | } | |
386 | ||
387 | static int dirty_bitmap_save_iterate(QEMUFile *f, void *opaque) | |
388 | { | |
389 | trace_dirty_bitmap_save_iterate(migration_in_postcopy()); | |
390 | ||
391 | if (migration_in_postcopy() && !dirty_bitmap_mig_state.bulk_completed) { | |
392 | bulk_phase(f, true); | |
393 | } | |
394 | ||
395 | qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS); | |
396 | ||
397 | return dirty_bitmap_mig_state.bulk_completed; | |
398 | } | |
399 | ||
400 | /* Called with iothread lock taken. */ | |
401 | ||
402 | static int dirty_bitmap_save_complete(QEMUFile *f, void *opaque) | |
403 | { | |
404 | DirtyBitmapMigBitmapState *dbms; | |
405 | trace_dirty_bitmap_save_complete_enter(); | |
406 | ||
407 | if (!dirty_bitmap_mig_state.bulk_completed) { | |
408 | bulk_phase(f, false); | |
409 | } | |
410 | ||
411 | QSIMPLEQ_FOREACH(dbms, &dirty_bitmap_mig_state.dbms_list, entry) { | |
412 | send_bitmap_complete(f, dbms); | |
413 | } | |
414 | ||
415 | qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS); | |
416 | ||
417 | trace_dirty_bitmap_save_complete_finish(); | |
418 | ||
419 | dirty_bitmap_mig_cleanup(); | |
420 | return 0; | |
421 | } | |
422 | ||
423 | static void dirty_bitmap_save_pending(QEMUFile *f, void *opaque, | |
424 | uint64_t max_size, | |
425 | uint64_t *res_precopy_only, | |
426 | uint64_t *res_compatible, | |
427 | uint64_t *res_postcopy_only) | |
428 | { | |
429 | DirtyBitmapMigBitmapState *dbms; | |
430 | uint64_t pending = 0; | |
431 | ||
432 | qemu_mutex_lock_iothread(); | |
433 | ||
434 | QSIMPLEQ_FOREACH(dbms, &dirty_bitmap_mig_state.dbms_list, entry) { | |
435 | uint64_t gran = bdrv_dirty_bitmap_granularity(dbms->bitmap); | |
436 | uint64_t sectors = dbms->bulk_completed ? 0 : | |
437 | dbms->total_sectors - dbms->cur_sector; | |
438 | ||
439 | pending += DIV_ROUND_UP(sectors * BDRV_SECTOR_SIZE, gran); | |
440 | } | |
441 | ||
442 | qemu_mutex_unlock_iothread(); | |
443 | ||
444 | trace_dirty_bitmap_save_pending(pending, max_size); | |
445 | ||
446 | *res_postcopy_only += pending; | |
447 | } | |
448 | ||
449 | /* First occurrence of this bitmap. It should be created if doesn't exist */ | |
450 | static int dirty_bitmap_load_start(QEMUFile *f, DirtyBitmapLoadState *s) | |
451 | { | |
452 | Error *local_err = NULL; | |
453 | uint32_t granularity = qemu_get_be32(f); | |
454 | uint8_t flags = qemu_get_byte(f); | |
455 | ||
456 | if (s->bitmap) { | |
457 | error_report("Bitmap with the same name ('%s') already exists on " | |
458 | "destination", bdrv_dirty_bitmap_name(s->bitmap)); | |
459 | return -EINVAL; | |
460 | } else { | |
461 | s->bitmap = bdrv_create_dirty_bitmap(s->bs, granularity, | |
462 | s->bitmap_name, &local_err); | |
463 | if (!s->bitmap) { | |
464 | error_report_err(local_err); | |
465 | return -EINVAL; | |
466 | } | |
467 | } | |
468 | ||
469 | if (flags & DIRTY_BITMAP_MIG_START_FLAG_RESERVED_MASK) { | |
470 | error_report("Unknown flags in migrated dirty bitmap header: %x", | |
471 | flags); | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
475 | if (flags & DIRTY_BITMAP_MIG_START_FLAG_PERSISTENT) { | |
796a3798 | 476 | bdrv_dirty_bitmap_set_persistence(s->bitmap, true); |
b35ebdf0 VSO |
477 | } |
478 | ||
479 | bdrv_disable_dirty_bitmap(s->bitmap); | |
480 | if (flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED) { | |
481 | DirtyBitmapLoadBitmapState *b; | |
482 | ||
483 | bdrv_dirty_bitmap_create_successor(s->bs, s->bitmap, &local_err); | |
484 | if (local_err) { | |
485 | error_report_err(local_err); | |
486 | return -EINVAL; | |
487 | } | |
488 | ||
489 | b = g_new(DirtyBitmapLoadBitmapState, 1); | |
490 | b->bs = s->bs; | |
491 | b->bitmap = s->bitmap; | |
492 | b->migrated = false; | |
493 | enabled_bitmaps = g_slist_prepend(enabled_bitmaps, b); | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | void dirty_bitmap_mig_before_vm_start(void) | |
500 | { | |
501 | GSList *item; | |
502 | ||
503 | qemu_mutex_lock(&finish_lock); | |
504 | ||
505 | for (item = enabled_bitmaps; item; item = g_slist_next(item)) { | |
506 | DirtyBitmapLoadBitmapState *b = item->data; | |
507 | ||
508 | if (b->migrated) { | |
58f72b96 | 509 | bdrv_enable_dirty_bitmap_locked(b->bitmap); |
b35ebdf0 VSO |
510 | } else { |
511 | bdrv_dirty_bitmap_enable_successor(b->bitmap); | |
512 | } | |
513 | ||
514 | g_free(b); | |
515 | } | |
516 | ||
517 | g_slist_free(enabled_bitmaps); | |
518 | enabled_bitmaps = NULL; | |
519 | ||
520 | qemu_mutex_unlock(&finish_lock); | |
521 | } | |
522 | ||
523 | static void dirty_bitmap_load_complete(QEMUFile *f, DirtyBitmapLoadState *s) | |
524 | { | |
525 | GSList *item; | |
526 | trace_dirty_bitmap_load_complete(); | |
527 | bdrv_dirty_bitmap_deserialize_finish(s->bitmap); | |
528 | ||
529 | qemu_mutex_lock(&finish_lock); | |
530 | ||
531 | for (item = enabled_bitmaps; item; item = g_slist_next(item)) { | |
532 | DirtyBitmapLoadBitmapState *b = item->data; | |
533 | ||
534 | if (b->bitmap == s->bitmap) { | |
535 | b->migrated = true; | |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
50a47257 | 540 | if (bdrv_dirty_bitmap_has_successor(s->bitmap)) { |
b35ebdf0 VSO |
541 | bdrv_dirty_bitmap_lock(s->bitmap); |
542 | if (enabled_bitmaps == NULL) { | |
543 | /* in postcopy */ | |
544 | bdrv_reclaim_dirty_bitmap_locked(s->bs, s->bitmap, &error_abort); | |
58f72b96 | 545 | bdrv_enable_dirty_bitmap_locked(s->bitmap); |
b35ebdf0 VSO |
546 | } else { |
547 | /* target not started, successor must be empty */ | |
548 | int64_t count = bdrv_get_dirty_count(s->bitmap); | |
549 | BdrvDirtyBitmap *ret = bdrv_reclaim_dirty_bitmap_locked(s->bs, | |
550 | s->bitmap, | |
551 | NULL); | |
552 | /* bdrv_reclaim_dirty_bitmap can fail only on no successor (it | |
553 | * must be) or on merge fail, but merge can't fail when second | |
554 | * bitmap is empty | |
555 | */ | |
556 | assert(ret == s->bitmap && | |
557 | count == bdrv_get_dirty_count(s->bitmap)); | |
558 | } | |
559 | bdrv_dirty_bitmap_unlock(s->bitmap); | |
560 | } | |
561 | ||
562 | qemu_mutex_unlock(&finish_lock); | |
563 | } | |
564 | ||
565 | static int dirty_bitmap_load_bits(QEMUFile *f, DirtyBitmapLoadState *s) | |
566 | { | |
567 | uint64_t first_byte = qemu_get_be64(f) << BDRV_SECTOR_BITS; | |
568 | uint64_t nr_bytes = (uint64_t)qemu_get_be32(f) << BDRV_SECTOR_BITS; | |
569 | trace_dirty_bitmap_load_bits_enter(first_byte >> BDRV_SECTOR_BITS, | |
570 | nr_bytes >> BDRV_SECTOR_BITS); | |
571 | ||
572 | if (s->flags & DIRTY_BITMAP_MIG_FLAG_ZEROES) { | |
573 | trace_dirty_bitmap_load_bits_zeroes(); | |
574 | bdrv_dirty_bitmap_deserialize_zeroes(s->bitmap, first_byte, nr_bytes, | |
575 | false); | |
576 | } else { | |
577 | size_t ret; | |
578 | uint8_t *buf; | |
579 | uint64_t buf_size = qemu_get_be64(f); | |
580 | uint64_t needed_size = | |
581 | bdrv_dirty_bitmap_serialization_size(s->bitmap, | |
582 | first_byte, nr_bytes); | |
583 | ||
584 | if (needed_size > buf_size || | |
585 | buf_size > QEMU_ALIGN_UP(needed_size, 4 * sizeof(long)) | |
586 | /* Here used same alignment as in send_bitmap_bits */ | |
587 | ) { | |
588 | error_report("Migrated bitmap granularity doesn't " | |
589 | "match the destination bitmap '%s' granularity", | |
590 | bdrv_dirty_bitmap_name(s->bitmap)); | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | buf = g_malloc(buf_size); | |
595 | ret = qemu_get_buffer(f, buf, buf_size); | |
596 | if (ret != buf_size) { | |
597 | error_report("Failed to read bitmap bits"); | |
16a22278 | 598 | g_free(buf); |
b35ebdf0 VSO |
599 | return -EIO; |
600 | } | |
601 | ||
602 | bdrv_dirty_bitmap_deserialize_part(s->bitmap, buf, first_byte, nr_bytes, | |
603 | false); | |
604 | g_free(buf); | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static int dirty_bitmap_load_header(QEMUFile *f, DirtyBitmapLoadState *s) | |
611 | { | |
612 | Error *local_err = NULL; | |
613 | bool nothing; | |
614 | s->flags = qemu_get_bitmap_flags(f); | |
615 | trace_dirty_bitmap_load_header(s->flags); | |
616 | ||
617 | nothing = s->flags == (s->flags & DIRTY_BITMAP_MIG_FLAG_EOS); | |
618 | ||
619 | if (s->flags & DIRTY_BITMAP_MIG_FLAG_DEVICE_NAME) { | |
620 | if (!qemu_get_counted_string(f, s->node_name)) { | |
621 | error_report("Unable to read node name string"); | |
622 | return -EINVAL; | |
623 | } | |
624 | s->bs = bdrv_lookup_bs(s->node_name, s->node_name, &local_err); | |
625 | if (!s->bs) { | |
626 | error_report_err(local_err); | |
627 | return -EINVAL; | |
628 | } | |
629 | } else if (!s->bs && !nothing) { | |
630 | error_report("Error: block device name is not set"); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | if (s->flags & DIRTY_BITMAP_MIG_FLAG_BITMAP_NAME) { | |
635 | if (!qemu_get_counted_string(f, s->bitmap_name)) { | |
636 | error_report("Unable to read bitmap name string"); | |
637 | return -EINVAL; | |
638 | } | |
639 | s->bitmap = bdrv_find_dirty_bitmap(s->bs, s->bitmap_name); | |
640 | ||
641 | /* bitmap may be NULL here, it wouldn't be an error if it is the | |
642 | * first occurrence of the bitmap */ | |
643 | if (!s->bitmap && !(s->flags & DIRTY_BITMAP_MIG_FLAG_START)) { | |
644 | error_report("Error: unknown dirty bitmap " | |
645 | "'%s' for block device '%s'", | |
646 | s->bitmap_name, s->node_name); | |
647 | return -EINVAL; | |
648 | } | |
649 | } else if (!s->bitmap && !nothing) { | |
650 | error_report("Error: block device name is not set"); | |
651 | return -EINVAL; | |
652 | } | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | static int dirty_bitmap_load(QEMUFile *f, void *opaque, int version_id) | |
658 | { | |
659 | static DirtyBitmapLoadState s; | |
660 | int ret = 0; | |
661 | ||
662 | trace_dirty_bitmap_load_enter(); | |
663 | ||
664 | if (version_id != 1) { | |
665 | return -EINVAL; | |
666 | } | |
667 | ||
668 | do { | |
669 | ret = dirty_bitmap_load_header(f, &s); | |
a36f6ff4 VSO |
670 | if (ret < 0) { |
671 | return ret; | |
672 | } | |
b35ebdf0 VSO |
673 | |
674 | if (s.flags & DIRTY_BITMAP_MIG_FLAG_START) { | |
675 | ret = dirty_bitmap_load_start(f, &s); | |
676 | } else if (s.flags & DIRTY_BITMAP_MIG_FLAG_COMPLETE) { | |
677 | dirty_bitmap_load_complete(f, &s); | |
678 | } else if (s.flags & DIRTY_BITMAP_MIG_FLAG_BITS) { | |
679 | ret = dirty_bitmap_load_bits(f, &s); | |
680 | } | |
681 | ||
682 | if (!ret) { | |
683 | ret = qemu_file_get_error(f); | |
684 | } | |
685 | ||
686 | if (ret) { | |
687 | return ret; | |
688 | } | |
689 | } while (!(s.flags & DIRTY_BITMAP_MIG_FLAG_EOS)); | |
690 | ||
691 | trace_dirty_bitmap_load_success(); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque) | |
696 | { | |
697 | DirtyBitmapMigBitmapState *dbms = NULL; | |
698 | if (init_dirty_bitmap_migration() < 0) { | |
699 | return -1; | |
700 | } | |
701 | ||
702 | QSIMPLEQ_FOREACH(dbms, &dirty_bitmap_mig_state.dbms_list, entry) { | |
703 | send_bitmap_start(f, dbms); | |
704 | } | |
705 | qemu_put_bitmap_flags(f, DIRTY_BITMAP_MIG_FLAG_EOS); | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static bool dirty_bitmap_is_active(void *opaque) | |
711 | { | |
712 | return migrate_dirty_bitmaps() && !dirty_bitmap_mig_state.no_bitmaps; | |
713 | } | |
714 | ||
715 | static bool dirty_bitmap_is_active_iterate(void *opaque) | |
716 | { | |
717 | return dirty_bitmap_is_active(opaque) && !runstate_is_running(); | |
718 | } | |
719 | ||
720 | static bool dirty_bitmap_has_postcopy(void *opaque) | |
721 | { | |
722 | return true; | |
723 | } | |
724 | ||
725 | static SaveVMHandlers savevm_dirty_bitmap_handlers = { | |
726 | .save_setup = dirty_bitmap_save_setup, | |
727 | .save_live_complete_postcopy = dirty_bitmap_save_complete, | |
728 | .save_live_complete_precopy = dirty_bitmap_save_complete, | |
729 | .has_postcopy = dirty_bitmap_has_postcopy, | |
730 | .save_live_pending = dirty_bitmap_save_pending, | |
731 | .save_live_iterate = dirty_bitmap_save_iterate, | |
732 | .is_active_iterate = dirty_bitmap_is_active_iterate, | |
733 | .load_state = dirty_bitmap_load, | |
734 | .save_cleanup = dirty_bitmap_save_cleanup, | |
735 | .is_active = dirty_bitmap_is_active, | |
736 | }; | |
737 | ||
738 | void dirty_bitmap_mig_init(void) | |
739 | { | |
740 | QSIMPLEQ_INIT(&dirty_bitmap_mig_state.dbms_list); | |
741 | ||
742 | register_savevm_live(NULL, "dirty-bitmap", 0, 1, | |
743 | &savevm_dirty_bitmap_handlers, | |
744 | &dirty_bitmap_mig_state); | |
745 | } |