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1 | /* | |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include <stdint.h> | |
25 | #include <stdarg.h> | |
26 | #include <stdlib.h> | |
27 | #ifndef _WIN32 | |
28 | #include <sys/types.h> | |
29 | #include <sys/mman.h> | |
30 | #endif | |
31 | #include "config.h" | |
32 | #include "monitor/monitor.h" | |
33 | #include "sysemu/sysemu.h" | |
34 | #include "qemu/bitops.h" | |
35 | #include "qemu/bitmap.h" | |
36 | #include "sysemu/arch_init.h" | |
37 | #include "audio/audio.h" | |
38 | #include "hw/i386/pc.h" | |
39 | #include "hw/pci/pci.h" | |
40 | #include "hw/audio/audio.h" | |
41 | #include "sysemu/kvm.h" | |
42 | #include "migration/migration.h" | |
43 | #include "hw/i386/smbios.h" | |
44 | #include "exec/address-spaces.h" | |
45 | #include "hw/audio/pcspk.h" | |
46 | #include "migration/page_cache.h" | |
47 | #include "qemu/config-file.h" | |
48 | #include "qmp-commands.h" | |
49 | #include "trace.h" | |
50 | #include "exec/cpu-all.h" | |
51 | #include "hw/acpi/acpi.h" | |
52 | ||
53 | #ifdef DEBUG_ARCH_INIT | |
54 | #define DPRINTF(fmt, ...) \ | |
55 | do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0) | |
56 | #else | |
57 | #define DPRINTF(fmt, ...) \ | |
58 | do { } while (0) | |
59 | #endif | |
60 | ||
61 | #ifdef TARGET_SPARC | |
62 | int graphic_width = 1024; | |
63 | int graphic_height = 768; | |
64 | int graphic_depth = 8; | |
65 | #else | |
66 | int graphic_width = 800; | |
67 | int graphic_height = 600; | |
68 | int graphic_depth = 32; | |
69 | #endif | |
70 | ||
71 | ||
72 | #if defined(TARGET_ALPHA) | |
73 | #define QEMU_ARCH QEMU_ARCH_ALPHA | |
74 | #elif defined(TARGET_ARM) | |
75 | #define QEMU_ARCH QEMU_ARCH_ARM | |
76 | #elif defined(TARGET_CRIS) | |
77 | #define QEMU_ARCH QEMU_ARCH_CRIS | |
78 | #elif defined(TARGET_I386) | |
79 | #define QEMU_ARCH QEMU_ARCH_I386 | |
80 | #elif defined(TARGET_M68K) | |
81 | #define QEMU_ARCH QEMU_ARCH_M68K | |
82 | #elif defined(TARGET_LM32) | |
83 | #define QEMU_ARCH QEMU_ARCH_LM32 | |
84 | #elif defined(TARGET_MICROBLAZE) | |
85 | #define QEMU_ARCH QEMU_ARCH_MICROBLAZE | |
86 | #elif defined(TARGET_MIPS) | |
87 | #define QEMU_ARCH QEMU_ARCH_MIPS | |
88 | #elif defined(TARGET_MOXIE) | |
89 | #define QEMU_ARCH QEMU_ARCH_MOXIE | |
90 | #elif defined(TARGET_OPENRISC) | |
91 | #define QEMU_ARCH QEMU_ARCH_OPENRISC | |
92 | #elif defined(TARGET_PPC) | |
93 | #define QEMU_ARCH QEMU_ARCH_PPC | |
94 | #elif defined(TARGET_S390X) | |
95 | #define QEMU_ARCH QEMU_ARCH_S390X | |
96 | #elif defined(TARGET_SH4) | |
97 | #define QEMU_ARCH QEMU_ARCH_SH4 | |
98 | #elif defined(TARGET_SPARC) | |
99 | #define QEMU_ARCH QEMU_ARCH_SPARC | |
100 | #elif defined(TARGET_XTENSA) | |
101 | #define QEMU_ARCH QEMU_ARCH_XTENSA | |
102 | #elif defined(TARGET_UNICORE32) | |
103 | #define QEMU_ARCH QEMU_ARCH_UNICORE32 | |
104 | #endif | |
105 | ||
106 | const uint32_t arch_type = QEMU_ARCH; | |
107 | static bool mig_throttle_on; | |
108 | static int dirty_rate_high_cnt; | |
109 | static void check_guest_throttling(void); | |
110 | ||
111 | /***********************************************************/ | |
112 | /* ram save/restore */ | |
113 | ||
114 | #define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */ | |
115 | #define RAM_SAVE_FLAG_COMPRESS 0x02 | |
116 | #define RAM_SAVE_FLAG_MEM_SIZE 0x04 | |
117 | #define RAM_SAVE_FLAG_PAGE 0x08 | |
118 | #define RAM_SAVE_FLAG_EOS 0x10 | |
119 | #define RAM_SAVE_FLAG_CONTINUE 0x20 | |
120 | #define RAM_SAVE_FLAG_XBZRLE 0x40 | |
121 | /* 0x80 is reserved in migration.h start with 0x100 next */ | |
122 | ||
123 | ||
124 | static struct defconfig_file { | |
125 | const char *filename; | |
126 | /* Indicates it is an user config file (disabled by -no-user-config) */ | |
127 | bool userconfig; | |
128 | } default_config_files[] = { | |
129 | { CONFIG_QEMU_CONFDIR "/qemu.conf", true }, | |
130 | { CONFIG_QEMU_CONFDIR "/target-" TARGET_NAME ".conf", true }, | |
131 | { NULL }, /* end of list */ | |
132 | }; | |
133 | ||
134 | ||
135 | int qemu_read_default_config_files(bool userconfig) | |
136 | { | |
137 | int ret; | |
138 | struct defconfig_file *f; | |
139 | ||
140 | for (f = default_config_files; f->filename; f++) { | |
141 | if (!userconfig && f->userconfig) { | |
142 | continue; | |
143 | } | |
144 | ret = qemu_read_config_file(f->filename); | |
145 | if (ret < 0 && ret != -ENOENT) { | |
146 | return ret; | |
147 | } | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static inline bool is_zero_page(uint8_t *p) | |
154 | { | |
155 | return buffer_find_nonzero_offset(p, TARGET_PAGE_SIZE) == | |
156 | TARGET_PAGE_SIZE; | |
157 | } | |
158 | ||
159 | /* struct contains XBZRLE cache and a static page | |
160 | used by the compression */ | |
161 | static struct { | |
162 | /* buffer used for XBZRLE encoding */ | |
163 | uint8_t *encoded_buf; | |
164 | /* buffer for storing page content */ | |
165 | uint8_t *current_buf; | |
166 | /* buffer used for XBZRLE decoding */ | |
167 | uint8_t *decoded_buf; | |
168 | /* Cache for XBZRLE */ | |
169 | PageCache *cache; | |
170 | } XBZRLE = { | |
171 | .encoded_buf = NULL, | |
172 | .current_buf = NULL, | |
173 | .decoded_buf = NULL, | |
174 | .cache = NULL, | |
175 | }; | |
176 | ||
177 | ||
178 | int64_t xbzrle_cache_resize(int64_t new_size) | |
179 | { | |
180 | if (XBZRLE.cache != NULL) { | |
181 | return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) * | |
182 | TARGET_PAGE_SIZE; | |
183 | } | |
184 | return pow2floor(new_size); | |
185 | } | |
186 | ||
187 | /* accounting for migration statistics */ | |
188 | typedef struct AccountingInfo { | |
189 | uint64_t dup_pages; | |
190 | uint64_t skipped_pages; | |
191 | uint64_t norm_pages; | |
192 | uint64_t iterations; | |
193 | uint64_t xbzrle_bytes; | |
194 | uint64_t xbzrle_pages; | |
195 | uint64_t xbzrle_cache_miss; | |
196 | uint64_t xbzrle_overflows; | |
197 | } AccountingInfo; | |
198 | ||
199 | static AccountingInfo acct_info; | |
200 | ||
201 | static void acct_clear(void) | |
202 | { | |
203 | memset(&acct_info, 0, sizeof(acct_info)); | |
204 | } | |
205 | ||
206 | uint64_t dup_mig_bytes_transferred(void) | |
207 | { | |
208 | return acct_info.dup_pages * TARGET_PAGE_SIZE; | |
209 | } | |
210 | ||
211 | uint64_t dup_mig_pages_transferred(void) | |
212 | { | |
213 | return acct_info.dup_pages; | |
214 | } | |
215 | ||
216 | uint64_t skipped_mig_bytes_transferred(void) | |
217 | { | |
218 | return acct_info.skipped_pages * TARGET_PAGE_SIZE; | |
219 | } | |
220 | ||
221 | uint64_t skipped_mig_pages_transferred(void) | |
222 | { | |
223 | return acct_info.skipped_pages; | |
224 | } | |
225 | ||
226 | uint64_t norm_mig_bytes_transferred(void) | |
227 | { | |
228 | return acct_info.norm_pages * TARGET_PAGE_SIZE; | |
229 | } | |
230 | ||
231 | uint64_t norm_mig_pages_transferred(void) | |
232 | { | |
233 | return acct_info.norm_pages; | |
234 | } | |
235 | ||
236 | uint64_t xbzrle_mig_bytes_transferred(void) | |
237 | { | |
238 | return acct_info.xbzrle_bytes; | |
239 | } | |
240 | ||
241 | uint64_t xbzrle_mig_pages_transferred(void) | |
242 | { | |
243 | return acct_info.xbzrle_pages; | |
244 | } | |
245 | ||
246 | uint64_t xbzrle_mig_pages_cache_miss(void) | |
247 | { | |
248 | return acct_info.xbzrle_cache_miss; | |
249 | } | |
250 | ||
251 | uint64_t xbzrle_mig_pages_overflow(void) | |
252 | { | |
253 | return acct_info.xbzrle_overflows; | |
254 | } | |
255 | ||
256 | static size_t save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset, | |
257 | int cont, int flag) | |
258 | { | |
259 | size_t size; | |
260 | ||
261 | qemu_put_be64(f, offset | cont | flag); | |
262 | size = 8; | |
263 | ||
264 | if (!cont) { | |
265 | qemu_put_byte(f, strlen(block->idstr)); | |
266 | qemu_put_buffer(f, (uint8_t *)block->idstr, | |
267 | strlen(block->idstr)); | |
268 | size += 1 + strlen(block->idstr); | |
269 | } | |
270 | return size; | |
271 | } | |
272 | ||
273 | #define ENCODING_FLAG_XBZRLE 0x1 | |
274 | ||
275 | static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data, | |
276 | ram_addr_t current_addr, RAMBlock *block, | |
277 | ram_addr_t offset, int cont, bool last_stage) | |
278 | { | |
279 | int encoded_len = 0, bytes_sent = -1; | |
280 | uint8_t *prev_cached_page; | |
281 | ||
282 | if (!cache_is_cached(XBZRLE.cache, current_addr)) { | |
283 | if (!last_stage) { | |
284 | cache_insert(XBZRLE.cache, current_addr, current_data); | |
285 | } | |
286 | acct_info.xbzrle_cache_miss++; | |
287 | return -1; | |
288 | } | |
289 | ||
290 | prev_cached_page = get_cached_data(XBZRLE.cache, current_addr); | |
291 | ||
292 | /* save current buffer into memory */ | |
293 | memcpy(XBZRLE.current_buf, current_data, TARGET_PAGE_SIZE); | |
294 | ||
295 | /* XBZRLE encoding (if there is no overflow) */ | |
296 | encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf, | |
297 | TARGET_PAGE_SIZE, XBZRLE.encoded_buf, | |
298 | TARGET_PAGE_SIZE); | |
299 | if (encoded_len == 0) { | |
300 | DPRINTF("Skipping unmodified page\n"); | |
301 | return 0; | |
302 | } else if (encoded_len == -1) { | |
303 | DPRINTF("Overflow\n"); | |
304 | acct_info.xbzrle_overflows++; | |
305 | /* update data in the cache */ | |
306 | memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE); | |
307 | return -1; | |
308 | } | |
309 | ||
310 | /* we need to update the data in the cache, in order to get the same data */ | |
311 | if (!last_stage) { | |
312 | memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE); | |
313 | } | |
314 | ||
315 | /* Send XBZRLE based compressed page */ | |
316 | bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE); | |
317 | qemu_put_byte(f, ENCODING_FLAG_XBZRLE); | |
318 | qemu_put_be16(f, encoded_len); | |
319 | qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len); | |
320 | bytes_sent += encoded_len + 1 + 2; | |
321 | acct_info.xbzrle_pages++; | |
322 | acct_info.xbzrle_bytes += bytes_sent; | |
323 | ||
324 | return bytes_sent; | |
325 | } | |
326 | ||
327 | ||
328 | /* This is the last block that we have visited serching for dirty pages | |
329 | */ | |
330 | static RAMBlock *last_seen_block; | |
331 | /* This is the last block from where we have sent data */ | |
332 | static RAMBlock *last_sent_block; | |
333 | static ram_addr_t last_offset; | |
334 | static unsigned long *migration_bitmap; | |
335 | static uint64_t migration_dirty_pages; | |
336 | static uint32_t last_version; | |
337 | static bool ram_bulk_stage; | |
338 | ||
339 | static inline | |
340 | ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr, | |
341 | ram_addr_t start) | |
342 | { | |
343 | unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS; | |
344 | unsigned long nr = base + (start >> TARGET_PAGE_BITS); | |
345 | uint64_t mr_size = TARGET_PAGE_ALIGN(memory_region_size(mr)); | |
346 | unsigned long size = base + (mr_size >> TARGET_PAGE_BITS); | |
347 | ||
348 | unsigned long next; | |
349 | ||
350 | if (ram_bulk_stage && nr > base) { | |
351 | next = nr + 1; | |
352 | } else { | |
353 | next = find_next_bit(migration_bitmap, size, nr); | |
354 | } | |
355 | ||
356 | if (next < size) { | |
357 | clear_bit(next, migration_bitmap); | |
358 | migration_dirty_pages--; | |
359 | } | |
360 | return (next - base) << TARGET_PAGE_BITS; | |
361 | } | |
362 | ||
363 | static inline bool migration_bitmap_set_dirty(MemoryRegion *mr, | |
364 | ram_addr_t offset) | |
365 | { | |
366 | bool ret; | |
367 | int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS; | |
368 | ||
369 | ret = test_and_set_bit(nr, migration_bitmap); | |
370 | ||
371 | if (!ret) { | |
372 | migration_dirty_pages++; | |
373 | } | |
374 | return ret; | |
375 | } | |
376 | ||
377 | /* Needs iothread lock! */ | |
378 | ||
379 | static void migration_bitmap_sync(void) | |
380 | { | |
381 | RAMBlock *block; | |
382 | ram_addr_t addr; | |
383 | uint64_t num_dirty_pages_init = migration_dirty_pages; | |
384 | MigrationState *s = migrate_get_current(); | |
385 | static int64_t start_time; | |
386 | static int64_t bytes_xfer_prev; | |
387 | static int64_t num_dirty_pages_period; | |
388 | int64_t end_time; | |
389 | int64_t bytes_xfer_now; | |
390 | ||
391 | if (!bytes_xfer_prev) { | |
392 | bytes_xfer_prev = ram_bytes_transferred(); | |
393 | } | |
394 | ||
395 | if (!start_time) { | |
396 | start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
397 | } | |
398 | ||
399 | trace_migration_bitmap_sync_start(); | |
400 | address_space_sync_dirty_bitmap(&address_space_memory); | |
401 | ||
402 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
403 | for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) { | |
404 | if (memory_region_test_and_clear_dirty(block->mr, | |
405 | addr, TARGET_PAGE_SIZE, | |
406 | DIRTY_MEMORY_MIGRATION)) { | |
407 | migration_bitmap_set_dirty(block->mr, addr); | |
408 | } | |
409 | } | |
410 | } | |
411 | trace_migration_bitmap_sync_end(migration_dirty_pages | |
412 | - num_dirty_pages_init); | |
413 | num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init; | |
414 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
415 | ||
416 | /* more than 1 second = 1000 millisecons */ | |
417 | if (end_time > start_time + 1000) { | |
418 | if (migrate_auto_converge()) { | |
419 | /* The following detection logic can be refined later. For now: | |
420 | Check to see if the dirtied bytes is 50% more than the approx. | |
421 | amount of bytes that just got transferred since the last time we | |
422 | were in this routine. If that happens >N times (for now N==4) | |
423 | we turn on the throttle down logic */ | |
424 | bytes_xfer_now = ram_bytes_transferred(); | |
425 | if (s->dirty_pages_rate && | |
426 | (num_dirty_pages_period * TARGET_PAGE_SIZE > | |
427 | (bytes_xfer_now - bytes_xfer_prev)/2) && | |
428 | (dirty_rate_high_cnt++ > 4)) { | |
429 | trace_migration_throttle(); | |
430 | mig_throttle_on = true; | |
431 | dirty_rate_high_cnt = 0; | |
432 | } | |
433 | bytes_xfer_prev = bytes_xfer_now; | |
434 | } else { | |
435 | mig_throttle_on = false; | |
436 | } | |
437 | s->dirty_pages_rate = num_dirty_pages_period * 1000 | |
438 | / (end_time - start_time); | |
439 | s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE; | |
440 | start_time = end_time; | |
441 | num_dirty_pages_period = 0; | |
442 | } | |
443 | } | |
444 | ||
445 | /* | |
446 | * ram_save_block: Writes a page of memory to the stream f | |
447 | * | |
448 | * Returns: The number of bytes written. | |
449 | * 0 means no dirty pages | |
450 | */ | |
451 | ||
452 | static int ram_save_block(QEMUFile *f, bool last_stage) | |
453 | { | |
454 | RAMBlock *block = last_seen_block; | |
455 | ram_addr_t offset = last_offset; | |
456 | bool complete_round = false; | |
457 | int bytes_sent = 0; | |
458 | MemoryRegion *mr; | |
459 | ram_addr_t current_addr; | |
460 | ||
461 | if (!block) | |
462 | block = QTAILQ_FIRST(&ram_list.blocks); | |
463 | ||
464 | while (true) { | |
465 | mr = block->mr; | |
466 | offset = migration_bitmap_find_and_reset_dirty(mr, offset); | |
467 | if (complete_round && block == last_seen_block && | |
468 | offset >= last_offset) { | |
469 | break; | |
470 | } | |
471 | if (offset >= block->length) { | |
472 | offset = 0; | |
473 | block = QTAILQ_NEXT(block, next); | |
474 | if (!block) { | |
475 | block = QTAILQ_FIRST(&ram_list.blocks); | |
476 | complete_round = true; | |
477 | ram_bulk_stage = false; | |
478 | } | |
479 | } else { | |
480 | int ret; | |
481 | uint8_t *p; | |
482 | int cont = (block == last_sent_block) ? | |
483 | RAM_SAVE_FLAG_CONTINUE : 0; | |
484 | ||
485 | p = memory_region_get_ram_ptr(mr) + offset; | |
486 | ||
487 | /* In doubt sent page as normal */ | |
488 | bytes_sent = -1; | |
489 | ret = ram_control_save_page(f, block->offset, | |
490 | offset, TARGET_PAGE_SIZE, &bytes_sent); | |
491 | ||
492 | if (ret != RAM_SAVE_CONTROL_NOT_SUPP) { | |
493 | if (ret != RAM_SAVE_CONTROL_DELAYED) { | |
494 | if (bytes_sent > 0) { | |
495 | acct_info.norm_pages++; | |
496 | } else if (bytes_sent == 0) { | |
497 | acct_info.dup_pages++; | |
498 | } | |
499 | } | |
500 | } else if (is_zero_page(p)) { | |
501 | acct_info.dup_pages++; | |
502 | bytes_sent = save_block_hdr(f, block, offset, cont, | |
503 | RAM_SAVE_FLAG_COMPRESS); | |
504 | qemu_put_byte(f, 0); | |
505 | bytes_sent++; | |
506 | } else if (!ram_bulk_stage && migrate_use_xbzrle()) { | |
507 | current_addr = block->offset + offset; | |
508 | bytes_sent = save_xbzrle_page(f, p, current_addr, block, | |
509 | offset, cont, last_stage); | |
510 | if (!last_stage) { | |
511 | p = get_cached_data(XBZRLE.cache, current_addr); | |
512 | } | |
513 | } | |
514 | ||
515 | /* XBZRLE overflow or normal page */ | |
516 | if (bytes_sent == -1) { | |
517 | bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE); | |
518 | qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE); | |
519 | bytes_sent += TARGET_PAGE_SIZE; | |
520 | acct_info.norm_pages++; | |
521 | } | |
522 | ||
523 | /* if page is unmodified, continue to the next */ | |
524 | if (bytes_sent > 0) { | |
525 | last_sent_block = block; | |
526 | break; | |
527 | } | |
528 | } | |
529 | } | |
530 | last_seen_block = block; | |
531 | last_offset = offset; | |
532 | ||
533 | return bytes_sent; | |
534 | } | |
535 | ||
536 | static uint64_t bytes_transferred; | |
537 | ||
538 | void acct_update_position(QEMUFile *f, size_t size, bool zero) | |
539 | { | |
540 | uint64_t pages = size / TARGET_PAGE_SIZE; | |
541 | if (zero) { | |
542 | acct_info.dup_pages += pages; | |
543 | } else { | |
544 | acct_info.norm_pages += pages; | |
545 | bytes_transferred += size; | |
546 | qemu_update_position(f, size); | |
547 | } | |
548 | } | |
549 | ||
550 | static ram_addr_t ram_save_remaining(void) | |
551 | { | |
552 | return migration_dirty_pages; | |
553 | } | |
554 | ||
555 | uint64_t ram_bytes_remaining(void) | |
556 | { | |
557 | return ram_save_remaining() * TARGET_PAGE_SIZE; | |
558 | } | |
559 | ||
560 | uint64_t ram_bytes_transferred(void) | |
561 | { | |
562 | return bytes_transferred; | |
563 | } | |
564 | ||
565 | uint64_t ram_bytes_total(void) | |
566 | { | |
567 | RAMBlock *block; | |
568 | uint64_t total = 0; | |
569 | ||
570 | QTAILQ_FOREACH(block, &ram_list.blocks, next) | |
571 | total += block->length; | |
572 | ||
573 | return total; | |
574 | } | |
575 | ||
576 | static void migration_end(void) | |
577 | { | |
578 | if (migration_bitmap) { | |
579 | memory_global_dirty_log_stop(); | |
580 | g_free(migration_bitmap); | |
581 | migration_bitmap = NULL; | |
582 | } | |
583 | ||
584 | if (XBZRLE.cache) { | |
585 | cache_fini(XBZRLE.cache); | |
586 | g_free(XBZRLE.cache); | |
587 | g_free(XBZRLE.encoded_buf); | |
588 | g_free(XBZRLE.current_buf); | |
589 | g_free(XBZRLE.decoded_buf); | |
590 | XBZRLE.cache = NULL; | |
591 | } | |
592 | } | |
593 | ||
594 | static void ram_migration_cancel(void *opaque) | |
595 | { | |
596 | migration_end(); | |
597 | } | |
598 | ||
599 | static void reset_ram_globals(void) | |
600 | { | |
601 | last_seen_block = NULL; | |
602 | last_sent_block = NULL; | |
603 | last_offset = 0; | |
604 | last_version = ram_list.version; | |
605 | ram_bulk_stage = true; | |
606 | } | |
607 | ||
608 | #define MAX_WAIT 50 /* ms, half buffered_file limit */ | |
609 | ||
610 | static int ram_save_setup(QEMUFile *f, void *opaque) | |
611 | { | |
612 | RAMBlock *block; | |
613 | int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS; | |
614 | ||
615 | migration_bitmap = bitmap_new(ram_pages); | |
616 | bitmap_set(migration_bitmap, 0, ram_pages); | |
617 | migration_dirty_pages = ram_pages; | |
618 | mig_throttle_on = false; | |
619 | dirty_rate_high_cnt = 0; | |
620 | ||
621 | if (migrate_use_xbzrle()) { | |
622 | XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() / | |
623 | TARGET_PAGE_SIZE, | |
624 | TARGET_PAGE_SIZE); | |
625 | if (!XBZRLE.cache) { | |
626 | DPRINTF("Error creating cache\n"); | |
627 | return -1; | |
628 | } | |
629 | XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE); | |
630 | XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE); | |
631 | acct_clear(); | |
632 | } | |
633 | ||
634 | qemu_mutex_lock_iothread(); | |
635 | qemu_mutex_lock_ramlist(); | |
636 | bytes_transferred = 0; | |
637 | reset_ram_globals(); | |
638 | ||
639 | memory_global_dirty_log_start(); | |
640 | migration_bitmap_sync(); | |
641 | qemu_mutex_unlock_iothread(); | |
642 | ||
643 | qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE); | |
644 | ||
645 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
646 | qemu_put_byte(f, strlen(block->idstr)); | |
647 | qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr)); | |
648 | qemu_put_be64(f, block->length); | |
649 | } | |
650 | ||
651 | qemu_mutex_unlock_ramlist(); | |
652 | ||
653 | ram_control_before_iterate(f, RAM_CONTROL_SETUP); | |
654 | ram_control_after_iterate(f, RAM_CONTROL_SETUP); | |
655 | ||
656 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | static int ram_save_iterate(QEMUFile *f, void *opaque) | |
662 | { | |
663 | int ret; | |
664 | int i; | |
665 | int64_t t0; | |
666 | int total_sent = 0; | |
667 | ||
668 | qemu_mutex_lock_ramlist(); | |
669 | ||
670 | if (ram_list.version != last_version) { | |
671 | reset_ram_globals(); | |
672 | } | |
673 | ||
674 | ram_control_before_iterate(f, RAM_CONTROL_ROUND); | |
675 | ||
676 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
677 | i = 0; | |
678 | while ((ret = qemu_file_rate_limit(f)) == 0) { | |
679 | int bytes_sent; | |
680 | ||
681 | bytes_sent = ram_save_block(f, false); | |
682 | /* no more blocks to sent */ | |
683 | if (bytes_sent == 0) { | |
684 | break; | |
685 | } | |
686 | total_sent += bytes_sent; | |
687 | acct_info.iterations++; | |
688 | check_guest_throttling(); | |
689 | /* we want to check in the 1st loop, just in case it was the 1st time | |
690 | and we had to sync the dirty bitmap. | |
691 | qemu_get_clock_ns() is a bit expensive, so we only check each some | |
692 | iterations | |
693 | */ | |
694 | if ((i & 63) == 0) { | |
695 | uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000; | |
696 | if (t1 > MAX_WAIT) { | |
697 | DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n", | |
698 | t1, i); | |
699 | break; | |
700 | } | |
701 | } | |
702 | i++; | |
703 | } | |
704 | ||
705 | qemu_mutex_unlock_ramlist(); | |
706 | ||
707 | /* | |
708 | * Must occur before EOS (or any QEMUFile operation) | |
709 | * because of RDMA protocol. | |
710 | */ | |
711 | ram_control_after_iterate(f, RAM_CONTROL_ROUND); | |
712 | ||
713 | if (ret < 0) { | |
714 | bytes_transferred += total_sent; | |
715 | return ret; | |
716 | } | |
717 | ||
718 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
719 | total_sent += 8; | |
720 | bytes_transferred += total_sent; | |
721 | ||
722 | return total_sent; | |
723 | } | |
724 | ||
725 | static int ram_save_complete(QEMUFile *f, void *opaque) | |
726 | { | |
727 | qemu_mutex_lock_ramlist(); | |
728 | migration_bitmap_sync(); | |
729 | ||
730 | ram_control_before_iterate(f, RAM_CONTROL_FINISH); | |
731 | ||
732 | /* try transferring iterative blocks of memory */ | |
733 | ||
734 | /* flush all remaining blocks regardless of rate limiting */ | |
735 | while (true) { | |
736 | int bytes_sent; | |
737 | ||
738 | bytes_sent = ram_save_block(f, true); | |
739 | /* no more blocks to sent */ | |
740 | if (bytes_sent == 0) { | |
741 | break; | |
742 | } | |
743 | bytes_transferred += bytes_sent; | |
744 | } | |
745 | ||
746 | ram_control_after_iterate(f, RAM_CONTROL_FINISH); | |
747 | migration_end(); | |
748 | ||
749 | qemu_mutex_unlock_ramlist(); | |
750 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
755 | static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size) | |
756 | { | |
757 | uint64_t remaining_size; | |
758 | ||
759 | remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE; | |
760 | ||
761 | if (remaining_size < max_size) { | |
762 | qemu_mutex_lock_iothread(); | |
763 | migration_bitmap_sync(); | |
764 | qemu_mutex_unlock_iothread(); | |
765 | remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE; | |
766 | } | |
767 | return remaining_size; | |
768 | } | |
769 | ||
770 | static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host) | |
771 | { | |
772 | int ret, rc = 0; | |
773 | unsigned int xh_len; | |
774 | int xh_flags; | |
775 | ||
776 | if (!XBZRLE.decoded_buf) { | |
777 | XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE); | |
778 | } | |
779 | ||
780 | /* extract RLE header */ | |
781 | xh_flags = qemu_get_byte(f); | |
782 | xh_len = qemu_get_be16(f); | |
783 | ||
784 | if (xh_flags != ENCODING_FLAG_XBZRLE) { | |
785 | fprintf(stderr, "Failed to load XBZRLE page - wrong compression!\n"); | |
786 | return -1; | |
787 | } | |
788 | ||
789 | if (xh_len > TARGET_PAGE_SIZE) { | |
790 | fprintf(stderr, "Failed to load XBZRLE page - len overflow!\n"); | |
791 | return -1; | |
792 | } | |
793 | /* load data and decode */ | |
794 | qemu_get_buffer(f, XBZRLE.decoded_buf, xh_len); | |
795 | ||
796 | /* decode RLE */ | |
797 | ret = xbzrle_decode_buffer(XBZRLE.decoded_buf, xh_len, host, | |
798 | TARGET_PAGE_SIZE); | |
799 | if (ret == -1) { | |
800 | fprintf(stderr, "Failed to load XBZRLE page - decode error!\n"); | |
801 | rc = -1; | |
802 | } else if (ret > TARGET_PAGE_SIZE) { | |
803 | fprintf(stderr, "Failed to load XBZRLE page - size %d exceeds %d!\n", | |
804 | ret, TARGET_PAGE_SIZE); | |
805 | abort(); | |
806 | } | |
807 | ||
808 | return rc; | |
809 | } | |
810 | ||
811 | static inline void *host_from_stream_offset(QEMUFile *f, | |
812 | ram_addr_t offset, | |
813 | int flags) | |
814 | { | |
815 | static RAMBlock *block = NULL; | |
816 | char id[256]; | |
817 | uint8_t len; | |
818 | ||
819 | if (flags & RAM_SAVE_FLAG_CONTINUE) { | |
820 | if (!block) { | |
821 | fprintf(stderr, "Ack, bad migration stream!\n"); | |
822 | return NULL; | |
823 | } | |
824 | ||
825 | return memory_region_get_ram_ptr(block->mr) + offset; | |
826 | } | |
827 | ||
828 | len = qemu_get_byte(f); | |
829 | qemu_get_buffer(f, (uint8_t *)id, len); | |
830 | id[len] = 0; | |
831 | ||
832 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
833 | if (!strncmp(id, block->idstr, sizeof(id))) | |
834 | return memory_region_get_ram_ptr(block->mr) + offset; | |
835 | } | |
836 | ||
837 | fprintf(stderr, "Can't find block %s!\n", id); | |
838 | return NULL; | |
839 | } | |
840 | ||
841 | /* | |
842 | * If a page (or a whole RDMA chunk) has been | |
843 | * determined to be zero, then zap it. | |
844 | */ | |
845 | void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) | |
846 | { | |
847 | if (ch != 0 || !is_zero_page(host)) { | |
848 | memset(host, ch, size); | |
849 | #ifndef _WIN32 | |
850 | if (ch == 0 && | |
851 | (!kvm_enabled() || kvm_has_sync_mmu()) && | |
852 | getpagesize() <= TARGET_PAGE_SIZE) { | |
853 | qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED); | |
854 | } | |
855 | #endif | |
856 | } | |
857 | } | |
858 | ||
859 | static int ram_load(QEMUFile *f, void *opaque, int version_id) | |
860 | { | |
861 | ram_addr_t addr; | |
862 | int flags, ret = 0; | |
863 | int error; | |
864 | static uint64_t seq_iter; | |
865 | ||
866 | seq_iter++; | |
867 | ||
868 | if (version_id < 4 || version_id > 4) { | |
869 | return -EINVAL; | |
870 | } | |
871 | ||
872 | do { | |
873 | addr = qemu_get_be64(f); | |
874 | ||
875 | flags = addr & ~TARGET_PAGE_MASK; | |
876 | addr &= TARGET_PAGE_MASK; | |
877 | ||
878 | if (flags & RAM_SAVE_FLAG_MEM_SIZE) { | |
879 | if (version_id == 4) { | |
880 | /* Synchronize RAM block list */ | |
881 | char id[256]; | |
882 | ram_addr_t length; | |
883 | ram_addr_t total_ram_bytes = addr; | |
884 | ||
885 | while (total_ram_bytes) { | |
886 | RAMBlock *block; | |
887 | uint8_t len; | |
888 | ||
889 | len = qemu_get_byte(f); | |
890 | qemu_get_buffer(f, (uint8_t *)id, len); | |
891 | id[len] = 0; | |
892 | length = qemu_get_be64(f); | |
893 | ||
894 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
895 | if (!strncmp(id, block->idstr, sizeof(id))) { | |
896 | if (block->length != length) { | |
897 | fprintf(stderr, | |
898 | "Length mismatch: %s: " RAM_ADDR_FMT | |
899 | " in != " RAM_ADDR_FMT "\n", id, length, | |
900 | block->length); | |
901 | ret = -EINVAL; | |
902 | goto done; | |
903 | } | |
904 | break; | |
905 | } | |
906 | } | |
907 | ||
908 | if (!block) { | |
909 | fprintf(stderr, "Unknown ramblock \"%s\", cannot " | |
910 | "accept migration\n", id); | |
911 | ret = -EINVAL; | |
912 | goto done; | |
913 | } | |
914 | ||
915 | total_ram_bytes -= length; | |
916 | } | |
917 | } | |
918 | } | |
919 | ||
920 | if (flags & RAM_SAVE_FLAG_COMPRESS) { | |
921 | void *host; | |
922 | uint8_t ch; | |
923 | ||
924 | host = host_from_stream_offset(f, addr, flags); | |
925 | if (!host) { | |
926 | return -EINVAL; | |
927 | } | |
928 | ||
929 | ch = qemu_get_byte(f); | |
930 | ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); | |
931 | } else if (flags & RAM_SAVE_FLAG_PAGE) { | |
932 | void *host; | |
933 | ||
934 | host = host_from_stream_offset(f, addr, flags); | |
935 | if (!host) { | |
936 | return -EINVAL; | |
937 | } | |
938 | ||
939 | qemu_get_buffer(f, host, TARGET_PAGE_SIZE); | |
940 | } else if (flags & RAM_SAVE_FLAG_XBZRLE) { | |
941 | void *host = host_from_stream_offset(f, addr, flags); | |
942 | if (!host) { | |
943 | return -EINVAL; | |
944 | } | |
945 | ||
946 | if (load_xbzrle(f, addr, host) < 0) { | |
947 | ret = -EINVAL; | |
948 | goto done; | |
949 | } | |
950 | } else if (flags & RAM_SAVE_FLAG_HOOK) { | |
951 | ram_control_load_hook(f, flags); | |
952 | } | |
953 | error = qemu_file_get_error(f); | |
954 | if (error) { | |
955 | ret = error; | |
956 | goto done; | |
957 | } | |
958 | } while (!(flags & RAM_SAVE_FLAG_EOS)); | |
959 | ||
960 | done: | |
961 | DPRINTF("Completed load of VM with exit code %d seq iteration " | |
962 | "%" PRIu64 "\n", ret, seq_iter); | |
963 | return ret; | |
964 | } | |
965 | ||
966 | SaveVMHandlers savevm_ram_handlers = { | |
967 | .save_live_setup = ram_save_setup, | |
968 | .save_live_iterate = ram_save_iterate, | |
969 | .save_live_complete = ram_save_complete, | |
970 | .save_live_pending = ram_save_pending, | |
971 | .load_state = ram_load, | |
972 | .cancel = ram_migration_cancel, | |
973 | }; | |
974 | ||
975 | struct soundhw { | |
976 | const char *name; | |
977 | const char *descr; | |
978 | int enabled; | |
979 | int isa; | |
980 | union { | |
981 | int (*init_isa) (ISABus *bus); | |
982 | int (*init_pci) (PCIBus *bus); | |
983 | } init; | |
984 | }; | |
985 | ||
986 | static struct soundhw soundhw[9]; | |
987 | static int soundhw_count; | |
988 | ||
989 | void isa_register_soundhw(const char *name, const char *descr, | |
990 | int (*init_isa)(ISABus *bus)) | |
991 | { | |
992 | assert(soundhw_count < ARRAY_SIZE(soundhw) - 1); | |
993 | soundhw[soundhw_count].name = name; | |
994 | soundhw[soundhw_count].descr = descr; | |
995 | soundhw[soundhw_count].isa = 1; | |
996 | soundhw[soundhw_count].init.init_isa = init_isa; | |
997 | soundhw_count++; | |
998 | } | |
999 | ||
1000 | void pci_register_soundhw(const char *name, const char *descr, | |
1001 | int (*init_pci)(PCIBus *bus)) | |
1002 | { | |
1003 | assert(soundhw_count < ARRAY_SIZE(soundhw) - 1); | |
1004 | soundhw[soundhw_count].name = name; | |
1005 | soundhw[soundhw_count].descr = descr; | |
1006 | soundhw[soundhw_count].isa = 0; | |
1007 | soundhw[soundhw_count].init.init_pci = init_pci; | |
1008 | soundhw_count++; | |
1009 | } | |
1010 | ||
1011 | void select_soundhw(const char *optarg) | |
1012 | { | |
1013 | struct soundhw *c; | |
1014 | ||
1015 | if (is_help_option(optarg)) { | |
1016 | show_valid_cards: | |
1017 | ||
1018 | if (soundhw_count) { | |
1019 | printf("Valid sound card names (comma separated):\n"); | |
1020 | for (c = soundhw; c->name; ++c) { | |
1021 | printf ("%-11s %s\n", c->name, c->descr); | |
1022 | } | |
1023 | printf("\n-soundhw all will enable all of the above\n"); | |
1024 | } else { | |
1025 | printf("Machine has no user-selectable audio hardware " | |
1026 | "(it may or may not have always-present audio hardware).\n"); | |
1027 | } | |
1028 | exit(!is_help_option(optarg)); | |
1029 | } | |
1030 | else { | |
1031 | size_t l; | |
1032 | const char *p; | |
1033 | char *e; | |
1034 | int bad_card = 0; | |
1035 | ||
1036 | if (!strcmp(optarg, "all")) { | |
1037 | for (c = soundhw; c->name; ++c) { | |
1038 | c->enabled = 1; | |
1039 | } | |
1040 | return; | |
1041 | } | |
1042 | ||
1043 | p = optarg; | |
1044 | while (*p) { | |
1045 | e = strchr(p, ','); | |
1046 | l = !e ? strlen(p) : (size_t) (e - p); | |
1047 | ||
1048 | for (c = soundhw; c->name; ++c) { | |
1049 | if (!strncmp(c->name, p, l) && !c->name[l]) { | |
1050 | c->enabled = 1; | |
1051 | break; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | if (!c->name) { | |
1056 | if (l > 80) { | |
1057 | fprintf(stderr, | |
1058 | "Unknown sound card name (too big to show)\n"); | |
1059 | } | |
1060 | else { | |
1061 | fprintf(stderr, "Unknown sound card name `%.*s'\n", | |
1062 | (int) l, p); | |
1063 | } | |
1064 | bad_card = 1; | |
1065 | } | |
1066 | p += l + (e != NULL); | |
1067 | } | |
1068 | ||
1069 | if (bad_card) { | |
1070 | goto show_valid_cards; | |
1071 | } | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | void audio_init(void) | |
1076 | { | |
1077 | struct soundhw *c; | |
1078 | ISABus *isa_bus = (ISABus *) object_resolve_path_type("", TYPE_ISA_BUS, NULL); | |
1079 | PCIBus *pci_bus = (PCIBus *) object_resolve_path_type("", TYPE_PCI_BUS, NULL); | |
1080 | ||
1081 | for (c = soundhw; c->name; ++c) { | |
1082 | if (c->enabled) { | |
1083 | if (c->isa) { | |
1084 | if (!isa_bus) { | |
1085 | fprintf(stderr, "ISA bus not available for %s\n", c->name); | |
1086 | exit(1); | |
1087 | } | |
1088 | c->init.init_isa(isa_bus); | |
1089 | } else { | |
1090 | if (!pci_bus) { | |
1091 | fprintf(stderr, "PCI bus not available for %s\n", c->name); | |
1092 | exit(1); | |
1093 | } | |
1094 | c->init.init_pci(pci_bus); | |
1095 | } | |
1096 | } | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | int qemu_uuid_parse(const char *str, uint8_t *uuid) | |
1101 | { | |
1102 | int ret; | |
1103 | ||
1104 | if (strlen(str) != 36) { | |
1105 | return -1; | |
1106 | } | |
1107 | ||
1108 | ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3], | |
1109 | &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9], | |
1110 | &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14], | |
1111 | &uuid[15]); | |
1112 | ||
1113 | if (ret != 16) { | |
1114 | return -1; | |
1115 | } | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | void do_acpitable_option(const QemuOpts *opts) | |
1120 | { | |
1121 | #ifdef TARGET_I386 | |
1122 | Error *err = NULL; | |
1123 | ||
1124 | acpi_table_add(opts, &err); | |
1125 | if (err) { | |
1126 | error_report("Wrong acpi table provided: %s", | |
1127 | error_get_pretty(err)); | |
1128 | error_free(err); | |
1129 | exit(1); | |
1130 | } | |
1131 | #endif | |
1132 | } | |
1133 | ||
1134 | void do_smbios_option(QemuOpts *opts) | |
1135 | { | |
1136 | #ifdef TARGET_I386 | |
1137 | smbios_entry_add(opts); | |
1138 | #endif | |
1139 | } | |
1140 | ||
1141 | void cpudef_init(void) | |
1142 | { | |
1143 | #if defined(cpudef_setup) | |
1144 | cpudef_setup(); /* parse cpu definitions in target config file */ | |
1145 | #endif | |
1146 | } | |
1147 | ||
1148 | int tcg_available(void) | |
1149 | { | |
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | int kvm_available(void) | |
1154 | { | |
1155 | #ifdef CONFIG_KVM | |
1156 | return 1; | |
1157 | #else | |
1158 | return 0; | |
1159 | #endif | |
1160 | } | |
1161 | ||
1162 | int xen_available(void) | |
1163 | { | |
1164 | #ifdef CONFIG_XEN | |
1165 | return 1; | |
1166 | #else | |
1167 | return 0; | |
1168 | #endif | |
1169 | } | |
1170 | ||
1171 | ||
1172 | TargetInfo *qmp_query_target(Error **errp) | |
1173 | { | |
1174 | TargetInfo *info = g_malloc0(sizeof(*info)); | |
1175 | ||
1176 | info->arch = g_strdup(TARGET_NAME); | |
1177 | ||
1178 | return info; | |
1179 | } | |
1180 | ||
1181 | /* Stub function that's gets run on the vcpu when its brought out of the | |
1182 | VM to run inside qemu via async_run_on_cpu()*/ | |
1183 | static void mig_sleep_cpu(void *opq) | |
1184 | { | |
1185 | qemu_mutex_unlock_iothread(); | |
1186 | g_usleep(30*1000); | |
1187 | qemu_mutex_lock_iothread(); | |
1188 | } | |
1189 | ||
1190 | /* To reduce the dirty rate explicitly disallow the VCPUs from spending | |
1191 | much time in the VM. The migration thread will try to catchup. | |
1192 | Workload will experience a performance drop. | |
1193 | */ | |
1194 | static void mig_throttle_guest_down(void) | |
1195 | { | |
1196 | CPUState *cpu; | |
1197 | ||
1198 | qemu_mutex_lock_iothread(); | |
1199 | CPU_FOREACH(cpu) { | |
1200 | async_run_on_cpu(cpu, mig_sleep_cpu, NULL); | |
1201 | } | |
1202 | qemu_mutex_unlock_iothread(); | |
1203 | } | |
1204 | ||
1205 | static void check_guest_throttling(void) | |
1206 | { | |
1207 | static int64_t t0; | |
1208 | int64_t t1; | |
1209 | ||
1210 | if (!mig_throttle_on) { | |
1211 | return; | |
1212 | } | |
1213 | ||
1214 | if (!t0) { | |
1215 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
1216 | return; | |
1217 | } | |
1218 | ||
1219 | t1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
1220 | ||
1221 | /* If it has been more than 40 ms since the last time the guest | |
1222 | * was throttled then do it again. | |
1223 | */ | |
1224 | if (40 < (t1-t0)/1000000) { | |
1225 | mig_throttle_guest_down(); | |
1226 | t0 = t1; | |
1227 | } | |
1228 | } |