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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 "exec/ram_addr.h" | |
52 | #include "hw/acpi/acpi.h" | |
53 | #include "qemu/host-utils.h" | |
54 | ||
55 | #ifdef DEBUG_ARCH_INIT | |
56 | #define DPRINTF(fmt, ...) \ | |
57 | do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0) | |
58 | #else | |
59 | #define DPRINTF(fmt, ...) \ | |
60 | do { } while (0) | |
61 | #endif | |
62 | ||
63 | #ifdef TARGET_SPARC | |
64 | int graphic_width = 1024; | |
65 | int graphic_height = 768; | |
66 | int graphic_depth = 8; | |
67 | #else | |
68 | int graphic_width = 800; | |
69 | int graphic_height = 600; | |
70 | int graphic_depth = 32; | |
71 | #endif | |
72 | ||
73 | ||
74 | #if defined(TARGET_ALPHA) | |
75 | #define QEMU_ARCH QEMU_ARCH_ALPHA | |
76 | #elif defined(TARGET_ARM) | |
77 | #define QEMU_ARCH QEMU_ARCH_ARM | |
78 | #elif defined(TARGET_CRIS) | |
79 | #define QEMU_ARCH QEMU_ARCH_CRIS | |
80 | #elif defined(TARGET_I386) | |
81 | #define QEMU_ARCH QEMU_ARCH_I386 | |
82 | #elif defined(TARGET_M68K) | |
83 | #define QEMU_ARCH QEMU_ARCH_M68K | |
84 | #elif defined(TARGET_LM32) | |
85 | #define QEMU_ARCH QEMU_ARCH_LM32 | |
86 | #elif defined(TARGET_MICROBLAZE) | |
87 | #define QEMU_ARCH QEMU_ARCH_MICROBLAZE | |
88 | #elif defined(TARGET_MIPS) | |
89 | #define QEMU_ARCH QEMU_ARCH_MIPS | |
90 | #elif defined(TARGET_MOXIE) | |
91 | #define QEMU_ARCH QEMU_ARCH_MOXIE | |
92 | #elif defined(TARGET_OPENRISC) | |
93 | #define QEMU_ARCH QEMU_ARCH_OPENRISC | |
94 | #elif defined(TARGET_PPC) | |
95 | #define QEMU_ARCH QEMU_ARCH_PPC | |
96 | #elif defined(TARGET_S390X) | |
97 | #define QEMU_ARCH QEMU_ARCH_S390X | |
98 | #elif defined(TARGET_SH4) | |
99 | #define QEMU_ARCH QEMU_ARCH_SH4 | |
100 | #elif defined(TARGET_SPARC) | |
101 | #define QEMU_ARCH QEMU_ARCH_SPARC | |
102 | #elif defined(TARGET_XTENSA) | |
103 | #define QEMU_ARCH QEMU_ARCH_XTENSA | |
104 | #elif defined(TARGET_UNICORE32) | |
105 | #define QEMU_ARCH QEMU_ARCH_UNICORE32 | |
106 | #endif | |
107 | ||
108 | const uint32_t arch_type = QEMU_ARCH; | |
109 | static bool mig_throttle_on; | |
110 | static int dirty_rate_high_cnt; | |
111 | static void check_guest_throttling(void); | |
112 | ||
113 | /***********************************************************/ | |
114 | /* ram save/restore */ | |
115 | ||
116 | #define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */ | |
117 | #define RAM_SAVE_FLAG_COMPRESS 0x02 | |
118 | #define RAM_SAVE_FLAG_MEM_SIZE 0x04 | |
119 | #define RAM_SAVE_FLAG_PAGE 0x08 | |
120 | #define RAM_SAVE_FLAG_EOS 0x10 | |
121 | #define RAM_SAVE_FLAG_CONTINUE 0x20 | |
122 | #define RAM_SAVE_FLAG_XBZRLE 0x40 | |
123 | /* 0x80 is reserved in migration.h start with 0x100 next */ | |
124 | ||
125 | ||
126 | static struct defconfig_file { | |
127 | const char *filename; | |
128 | /* Indicates it is an user config file (disabled by -no-user-config) */ | |
129 | bool userconfig; | |
130 | } default_config_files[] = { | |
131 | { CONFIG_QEMU_CONFDIR "/qemu.conf", true }, | |
132 | { CONFIG_QEMU_CONFDIR "/target-" TARGET_NAME ".conf", true }, | |
133 | { NULL }, /* end of list */ | |
134 | }; | |
135 | ||
136 | ||
137 | int qemu_read_default_config_files(bool userconfig) | |
138 | { | |
139 | int ret; | |
140 | struct defconfig_file *f; | |
141 | ||
142 | for (f = default_config_files; f->filename; f++) { | |
143 | if (!userconfig && f->userconfig) { | |
144 | continue; | |
145 | } | |
146 | ret = qemu_read_config_file(f->filename); | |
147 | if (ret < 0 && ret != -ENOENT) { | |
148 | return ret; | |
149 | } | |
150 | } | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static inline bool is_zero_range(uint8_t *p, uint64_t size) | |
156 | { | |
157 | return buffer_find_nonzero_offset(p, size) == size; | |
158 | } | |
159 | ||
160 | /* struct contains XBZRLE cache and a static page | |
161 | used by the compression */ | |
162 | static struct { | |
163 | /* buffer used for XBZRLE encoding */ | |
164 | uint8_t *encoded_buf; | |
165 | /* buffer for storing page content */ | |
166 | uint8_t *current_buf; | |
167 | /* buffer used for XBZRLE decoding */ | |
168 | uint8_t *decoded_buf; | |
169 | /* Cache for XBZRLE */ | |
170 | PageCache *cache; | |
171 | } XBZRLE = { | |
172 | .encoded_buf = NULL, | |
173 | .current_buf = NULL, | |
174 | .decoded_buf = NULL, | |
175 | .cache = NULL, | |
176 | }; | |
177 | ||
178 | ||
179 | int64_t xbzrle_cache_resize(int64_t new_size) | |
180 | { | |
181 | if (XBZRLE.cache != NULL) { | |
182 | return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) * | |
183 | TARGET_PAGE_SIZE; | |
184 | } | |
185 | return pow2floor(new_size); | |
186 | } | |
187 | ||
188 | /* accounting for migration statistics */ | |
189 | typedef struct AccountingInfo { | |
190 | uint64_t dup_pages; | |
191 | uint64_t skipped_pages; | |
192 | uint64_t norm_pages; | |
193 | uint64_t iterations; | |
194 | uint64_t xbzrle_bytes; | |
195 | uint64_t xbzrle_pages; | |
196 | uint64_t xbzrle_cache_miss; | |
197 | uint64_t xbzrle_overflows; | |
198 | } AccountingInfo; | |
199 | ||
200 | static AccountingInfo acct_info; | |
201 | ||
202 | static void acct_clear(void) | |
203 | { | |
204 | memset(&acct_info, 0, sizeof(acct_info)); | |
205 | } | |
206 | ||
207 | uint64_t dup_mig_bytes_transferred(void) | |
208 | { | |
209 | return acct_info.dup_pages * TARGET_PAGE_SIZE; | |
210 | } | |
211 | ||
212 | uint64_t dup_mig_pages_transferred(void) | |
213 | { | |
214 | return acct_info.dup_pages; | |
215 | } | |
216 | ||
217 | uint64_t skipped_mig_bytes_transferred(void) | |
218 | { | |
219 | return acct_info.skipped_pages * TARGET_PAGE_SIZE; | |
220 | } | |
221 | ||
222 | uint64_t skipped_mig_pages_transferred(void) | |
223 | { | |
224 | return acct_info.skipped_pages; | |
225 | } | |
226 | ||
227 | uint64_t norm_mig_bytes_transferred(void) | |
228 | { | |
229 | return acct_info.norm_pages * TARGET_PAGE_SIZE; | |
230 | } | |
231 | ||
232 | uint64_t norm_mig_pages_transferred(void) | |
233 | { | |
234 | return acct_info.norm_pages; | |
235 | } | |
236 | ||
237 | uint64_t xbzrle_mig_bytes_transferred(void) | |
238 | { | |
239 | return acct_info.xbzrle_bytes; | |
240 | } | |
241 | ||
242 | uint64_t xbzrle_mig_pages_transferred(void) | |
243 | { | |
244 | return acct_info.xbzrle_pages; | |
245 | } | |
246 | ||
247 | uint64_t xbzrle_mig_pages_cache_miss(void) | |
248 | { | |
249 | return acct_info.xbzrle_cache_miss; | |
250 | } | |
251 | ||
252 | uint64_t xbzrle_mig_pages_overflow(void) | |
253 | { | |
254 | return acct_info.xbzrle_overflows; | |
255 | } | |
256 | ||
257 | static size_t save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset, | |
258 | int cont, int flag) | |
259 | { | |
260 | size_t size; | |
261 | ||
262 | qemu_put_be64(f, offset | cont | flag); | |
263 | size = 8; | |
264 | ||
265 | if (!cont) { | |
266 | qemu_put_byte(f, strlen(block->idstr)); | |
267 | qemu_put_buffer(f, (uint8_t *)block->idstr, | |
268 | strlen(block->idstr)); | |
269 | size += 1 + strlen(block->idstr); | |
270 | } | |
271 | return size; | |
272 | } | |
273 | ||
274 | #define ENCODING_FLAG_XBZRLE 0x1 | |
275 | ||
276 | static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data, | |
277 | ram_addr_t current_addr, RAMBlock *block, | |
278 | ram_addr_t offset, int cont, bool last_stage) | |
279 | { | |
280 | int encoded_len = 0, bytes_sent = -1; | |
281 | uint8_t *prev_cached_page; | |
282 | ||
283 | if (!cache_is_cached(XBZRLE.cache, current_addr)) { | |
284 | if (!last_stage) { | |
285 | cache_insert(XBZRLE.cache, current_addr, current_data); | |
286 | } | |
287 | acct_info.xbzrle_cache_miss++; | |
288 | return -1; | |
289 | } | |
290 | ||
291 | prev_cached_page = get_cached_data(XBZRLE.cache, current_addr); | |
292 | ||
293 | /* save current buffer into memory */ | |
294 | memcpy(XBZRLE.current_buf, current_data, TARGET_PAGE_SIZE); | |
295 | ||
296 | /* XBZRLE encoding (if there is no overflow) */ | |
297 | encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf, | |
298 | TARGET_PAGE_SIZE, XBZRLE.encoded_buf, | |
299 | TARGET_PAGE_SIZE); | |
300 | if (encoded_len == 0) { | |
301 | DPRINTF("Skipping unmodified page\n"); | |
302 | return 0; | |
303 | } else if (encoded_len == -1) { | |
304 | DPRINTF("Overflow\n"); | |
305 | acct_info.xbzrle_overflows++; | |
306 | /* update data in the cache */ | |
307 | memcpy(prev_cached_page, current_data, TARGET_PAGE_SIZE); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | /* we need to update the data in the cache, in order to get the same data */ | |
312 | if (!last_stage) { | |
313 | memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE); | |
314 | } | |
315 | ||
316 | /* Send XBZRLE based compressed page */ | |
317 | bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE); | |
318 | qemu_put_byte(f, ENCODING_FLAG_XBZRLE); | |
319 | qemu_put_be16(f, encoded_len); | |
320 | qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len); | |
321 | bytes_sent += encoded_len + 1 + 2; | |
322 | acct_info.xbzrle_pages++; | |
323 | acct_info.xbzrle_bytes += bytes_sent; | |
324 | ||
325 | return bytes_sent; | |
326 | } | |
327 | ||
328 | ||
329 | /* This is the last block that we have visited serching for dirty pages | |
330 | */ | |
331 | static RAMBlock *last_seen_block; | |
332 | /* This is the last block from where we have sent data */ | |
333 | static RAMBlock *last_sent_block; | |
334 | static ram_addr_t last_offset; | |
335 | static unsigned long *migration_bitmap; | |
336 | static uint64_t migration_dirty_pages; | |
337 | static uint32_t last_version; | |
338 | static bool ram_bulk_stage; | |
339 | ||
340 | static inline | |
341 | ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr, | |
342 | ram_addr_t start) | |
343 | { | |
344 | unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS; | |
345 | unsigned long nr = base + (start >> TARGET_PAGE_BITS); | |
346 | uint64_t mr_size = TARGET_PAGE_ALIGN(memory_region_size(mr)); | |
347 | unsigned long size = base + (mr_size >> TARGET_PAGE_BITS); | |
348 | ||
349 | unsigned long next; | |
350 | ||
351 | if (ram_bulk_stage && nr > base) { | |
352 | next = nr + 1; | |
353 | } else { | |
354 | next = find_next_bit(migration_bitmap, size, nr); | |
355 | } | |
356 | ||
357 | if (next < size) { | |
358 | clear_bit(next, migration_bitmap); | |
359 | migration_dirty_pages--; | |
360 | } | |
361 | return (next - base) << TARGET_PAGE_BITS; | |
362 | } | |
363 | ||
364 | static inline bool migration_bitmap_set_dirty(ram_addr_t addr) | |
365 | { | |
366 | bool ret; | |
367 | int nr = addr >> 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 | static void migration_bitmap_sync_range(ram_addr_t start, ram_addr_t length) | |
378 | { | |
379 | ram_addr_t addr; | |
380 | unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS); | |
381 | ||
382 | /* start address is aligned at the start of a word? */ | |
383 | if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) { | |
384 | int k; | |
385 | int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS); | |
386 | unsigned long *src = ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION]; | |
387 | ||
388 | for (k = page; k < page + nr; k++) { | |
389 | if (src[k]) { | |
390 | unsigned long new_dirty; | |
391 | new_dirty = ~migration_bitmap[k]; | |
392 | migration_bitmap[k] |= src[k]; | |
393 | new_dirty &= src[k]; | |
394 | migration_dirty_pages += ctpopl(new_dirty); | |
395 | src[k] = 0; | |
396 | } | |
397 | } | |
398 | } else { | |
399 | for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) { | |
400 | if (cpu_physical_memory_get_dirty(start + addr, | |
401 | TARGET_PAGE_SIZE, | |
402 | DIRTY_MEMORY_MIGRATION)) { | |
403 | cpu_physical_memory_reset_dirty(start + addr, | |
404 | TARGET_PAGE_SIZE, | |
405 | DIRTY_MEMORY_MIGRATION); | |
406 | migration_bitmap_set_dirty(start + addr); | |
407 | } | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
412 | ||
413 | /* Needs iothread lock! */ | |
414 | ||
415 | static void migration_bitmap_sync(void) | |
416 | { | |
417 | RAMBlock *block; | |
418 | uint64_t num_dirty_pages_init = migration_dirty_pages; | |
419 | MigrationState *s = migrate_get_current(); | |
420 | static int64_t start_time; | |
421 | static int64_t bytes_xfer_prev; | |
422 | static int64_t num_dirty_pages_period; | |
423 | int64_t end_time; | |
424 | int64_t bytes_xfer_now; | |
425 | ||
426 | if (!bytes_xfer_prev) { | |
427 | bytes_xfer_prev = ram_bytes_transferred(); | |
428 | } | |
429 | ||
430 | if (!start_time) { | |
431 | start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
432 | } | |
433 | ||
434 | trace_migration_bitmap_sync_start(); | |
435 | address_space_sync_dirty_bitmap(&address_space_memory); | |
436 | ||
437 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
438 | migration_bitmap_sync_range(block->mr->ram_addr, block->length); | |
439 | } | |
440 | trace_migration_bitmap_sync_end(migration_dirty_pages | |
441 | - num_dirty_pages_init); | |
442 | num_dirty_pages_period += migration_dirty_pages - num_dirty_pages_init; | |
443 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
444 | ||
445 | /* more than 1 second = 1000 millisecons */ | |
446 | if (end_time > start_time + 1000) { | |
447 | if (migrate_auto_converge()) { | |
448 | /* The following detection logic can be refined later. For now: | |
449 | Check to see if the dirtied bytes is 50% more than the approx. | |
450 | amount of bytes that just got transferred since the last time we | |
451 | were in this routine. If that happens >N times (for now N==4) | |
452 | we turn on the throttle down logic */ | |
453 | bytes_xfer_now = ram_bytes_transferred(); | |
454 | if (s->dirty_pages_rate && | |
455 | (num_dirty_pages_period * TARGET_PAGE_SIZE > | |
456 | (bytes_xfer_now - bytes_xfer_prev)/2) && | |
457 | (dirty_rate_high_cnt++ > 4)) { | |
458 | trace_migration_throttle(); | |
459 | mig_throttle_on = true; | |
460 | dirty_rate_high_cnt = 0; | |
461 | } | |
462 | bytes_xfer_prev = bytes_xfer_now; | |
463 | } else { | |
464 | mig_throttle_on = false; | |
465 | } | |
466 | s->dirty_pages_rate = num_dirty_pages_period * 1000 | |
467 | / (end_time - start_time); | |
468 | s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE; | |
469 | start_time = end_time; | |
470 | num_dirty_pages_period = 0; | |
471 | } | |
472 | } | |
473 | ||
474 | /* | |
475 | * ram_save_block: Writes a page of memory to the stream f | |
476 | * | |
477 | * Returns: The number of bytes written. | |
478 | * 0 means no dirty pages | |
479 | */ | |
480 | ||
481 | static int ram_save_block(QEMUFile *f, bool last_stage) | |
482 | { | |
483 | RAMBlock *block = last_seen_block; | |
484 | ram_addr_t offset = last_offset; | |
485 | bool complete_round = false; | |
486 | int bytes_sent = 0; | |
487 | MemoryRegion *mr; | |
488 | ram_addr_t current_addr; | |
489 | ||
490 | if (!block) | |
491 | block = QTAILQ_FIRST(&ram_list.blocks); | |
492 | ||
493 | while (true) { | |
494 | mr = block->mr; | |
495 | offset = migration_bitmap_find_and_reset_dirty(mr, offset); | |
496 | if (complete_round && block == last_seen_block && | |
497 | offset >= last_offset) { | |
498 | break; | |
499 | } | |
500 | if (offset >= block->length) { | |
501 | offset = 0; | |
502 | block = QTAILQ_NEXT(block, next); | |
503 | if (!block) { | |
504 | block = QTAILQ_FIRST(&ram_list.blocks); | |
505 | complete_round = true; | |
506 | ram_bulk_stage = false; | |
507 | } | |
508 | } else { | |
509 | int ret; | |
510 | uint8_t *p; | |
511 | int cont = (block == last_sent_block) ? | |
512 | RAM_SAVE_FLAG_CONTINUE : 0; | |
513 | ||
514 | p = memory_region_get_ram_ptr(mr) + offset; | |
515 | ||
516 | /* In doubt sent page as normal */ | |
517 | bytes_sent = -1; | |
518 | ret = ram_control_save_page(f, block->offset, | |
519 | offset, TARGET_PAGE_SIZE, &bytes_sent); | |
520 | ||
521 | if (ret != RAM_SAVE_CONTROL_NOT_SUPP) { | |
522 | if (ret != RAM_SAVE_CONTROL_DELAYED) { | |
523 | if (bytes_sent > 0) { | |
524 | acct_info.norm_pages++; | |
525 | } else if (bytes_sent == 0) { | |
526 | acct_info.dup_pages++; | |
527 | } | |
528 | } | |
529 | } else if (is_zero_range(p, TARGET_PAGE_SIZE)) { | |
530 | acct_info.dup_pages++; | |
531 | bytes_sent = save_block_hdr(f, block, offset, cont, | |
532 | RAM_SAVE_FLAG_COMPRESS); | |
533 | qemu_put_byte(f, 0); | |
534 | bytes_sent++; | |
535 | } else if (!ram_bulk_stage && migrate_use_xbzrle()) { | |
536 | current_addr = block->offset + offset; | |
537 | bytes_sent = save_xbzrle_page(f, p, current_addr, block, | |
538 | offset, cont, last_stage); | |
539 | if (!last_stage) { | |
540 | p = get_cached_data(XBZRLE.cache, current_addr); | |
541 | } | |
542 | } | |
543 | ||
544 | /* XBZRLE overflow or normal page */ | |
545 | if (bytes_sent == -1) { | |
546 | bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE); | |
547 | qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE); | |
548 | bytes_sent += TARGET_PAGE_SIZE; | |
549 | acct_info.norm_pages++; | |
550 | } | |
551 | ||
552 | /* if page is unmodified, continue to the next */ | |
553 | if (bytes_sent > 0) { | |
554 | last_sent_block = block; | |
555 | break; | |
556 | } | |
557 | } | |
558 | } | |
559 | last_seen_block = block; | |
560 | last_offset = offset; | |
561 | ||
562 | return bytes_sent; | |
563 | } | |
564 | ||
565 | static uint64_t bytes_transferred; | |
566 | ||
567 | void acct_update_position(QEMUFile *f, size_t size, bool zero) | |
568 | { | |
569 | uint64_t pages = size / TARGET_PAGE_SIZE; | |
570 | if (zero) { | |
571 | acct_info.dup_pages += pages; | |
572 | } else { | |
573 | acct_info.norm_pages += pages; | |
574 | bytes_transferred += size; | |
575 | qemu_update_position(f, size); | |
576 | } | |
577 | } | |
578 | ||
579 | static ram_addr_t ram_save_remaining(void) | |
580 | { | |
581 | return migration_dirty_pages; | |
582 | } | |
583 | ||
584 | uint64_t ram_bytes_remaining(void) | |
585 | { | |
586 | return ram_save_remaining() * TARGET_PAGE_SIZE; | |
587 | } | |
588 | ||
589 | uint64_t ram_bytes_transferred(void) | |
590 | { | |
591 | return bytes_transferred; | |
592 | } | |
593 | ||
594 | uint64_t ram_bytes_total(void) | |
595 | { | |
596 | RAMBlock *block; | |
597 | uint64_t total = 0; | |
598 | ||
599 | QTAILQ_FOREACH(block, &ram_list.blocks, next) | |
600 | total += block->length; | |
601 | ||
602 | return total; | |
603 | } | |
604 | ||
605 | static void migration_end(void) | |
606 | { | |
607 | if (migration_bitmap) { | |
608 | memory_global_dirty_log_stop(); | |
609 | g_free(migration_bitmap); | |
610 | migration_bitmap = NULL; | |
611 | } | |
612 | ||
613 | if (XBZRLE.cache) { | |
614 | cache_fini(XBZRLE.cache); | |
615 | g_free(XBZRLE.cache); | |
616 | g_free(XBZRLE.encoded_buf); | |
617 | g_free(XBZRLE.current_buf); | |
618 | g_free(XBZRLE.decoded_buf); | |
619 | XBZRLE.cache = NULL; | |
620 | } | |
621 | } | |
622 | ||
623 | static void ram_migration_cancel(void *opaque) | |
624 | { | |
625 | migration_end(); | |
626 | } | |
627 | ||
628 | static void reset_ram_globals(void) | |
629 | { | |
630 | last_seen_block = NULL; | |
631 | last_sent_block = NULL; | |
632 | last_offset = 0; | |
633 | last_version = ram_list.version; | |
634 | ram_bulk_stage = true; | |
635 | } | |
636 | ||
637 | #define MAX_WAIT 50 /* ms, half buffered_file limit */ | |
638 | ||
639 | static int ram_save_setup(QEMUFile *f, void *opaque) | |
640 | { | |
641 | RAMBlock *block; | |
642 | int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS; | |
643 | ||
644 | migration_bitmap = bitmap_new(ram_pages); | |
645 | bitmap_set(migration_bitmap, 0, ram_pages); | |
646 | migration_dirty_pages = ram_pages; | |
647 | mig_throttle_on = false; | |
648 | dirty_rate_high_cnt = 0; | |
649 | ||
650 | if (migrate_use_xbzrle()) { | |
651 | XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() / | |
652 | TARGET_PAGE_SIZE, | |
653 | TARGET_PAGE_SIZE); | |
654 | if (!XBZRLE.cache) { | |
655 | DPRINTF("Error creating cache\n"); | |
656 | return -1; | |
657 | } | |
658 | XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE); | |
659 | XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE); | |
660 | acct_clear(); | |
661 | } | |
662 | ||
663 | qemu_mutex_lock_iothread(); | |
664 | qemu_mutex_lock_ramlist(); | |
665 | bytes_transferred = 0; | |
666 | reset_ram_globals(); | |
667 | ||
668 | memory_global_dirty_log_start(); | |
669 | migration_bitmap_sync(); | |
670 | qemu_mutex_unlock_iothread(); | |
671 | ||
672 | qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE); | |
673 | ||
674 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
675 | qemu_put_byte(f, strlen(block->idstr)); | |
676 | qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr)); | |
677 | qemu_put_be64(f, block->length); | |
678 | } | |
679 | ||
680 | qemu_mutex_unlock_ramlist(); | |
681 | ||
682 | ram_control_before_iterate(f, RAM_CONTROL_SETUP); | |
683 | ram_control_after_iterate(f, RAM_CONTROL_SETUP); | |
684 | ||
685 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | static int ram_save_iterate(QEMUFile *f, void *opaque) | |
691 | { | |
692 | int ret; | |
693 | int i; | |
694 | int64_t t0; | |
695 | int total_sent = 0; | |
696 | ||
697 | qemu_mutex_lock_ramlist(); | |
698 | ||
699 | if (ram_list.version != last_version) { | |
700 | reset_ram_globals(); | |
701 | } | |
702 | ||
703 | ram_control_before_iterate(f, RAM_CONTROL_ROUND); | |
704 | ||
705 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
706 | i = 0; | |
707 | while ((ret = qemu_file_rate_limit(f)) == 0) { | |
708 | int bytes_sent; | |
709 | ||
710 | bytes_sent = ram_save_block(f, false); | |
711 | /* no more blocks to sent */ | |
712 | if (bytes_sent == 0) { | |
713 | break; | |
714 | } | |
715 | total_sent += bytes_sent; | |
716 | acct_info.iterations++; | |
717 | check_guest_throttling(); | |
718 | /* we want to check in the 1st loop, just in case it was the 1st time | |
719 | and we had to sync the dirty bitmap. | |
720 | qemu_get_clock_ns() is a bit expensive, so we only check each some | |
721 | iterations | |
722 | */ | |
723 | if ((i & 63) == 0) { | |
724 | uint64_t t1 = (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - t0) / 1000000; | |
725 | if (t1 > MAX_WAIT) { | |
726 | DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n", | |
727 | t1, i); | |
728 | break; | |
729 | } | |
730 | } | |
731 | i++; | |
732 | } | |
733 | ||
734 | qemu_mutex_unlock_ramlist(); | |
735 | ||
736 | /* | |
737 | * Must occur before EOS (or any QEMUFile operation) | |
738 | * because of RDMA protocol. | |
739 | */ | |
740 | ram_control_after_iterate(f, RAM_CONTROL_ROUND); | |
741 | ||
742 | bytes_transferred += total_sent; | |
743 | ||
744 | /* | |
745 | * Do not count these 8 bytes into total_sent, so that we can | |
746 | * return 0 if no page had been dirtied. | |
747 | */ | |
748 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
749 | bytes_transferred += 8; | |
750 | ||
751 | ret = qemu_file_get_error(f); | |
752 | if (ret < 0) { | |
753 | return ret; | |
754 | } | |
755 | ||
756 | return total_sent; | |
757 | } | |
758 | ||
759 | static int ram_save_complete(QEMUFile *f, void *opaque) | |
760 | { | |
761 | qemu_mutex_lock_ramlist(); | |
762 | migration_bitmap_sync(); | |
763 | ||
764 | ram_control_before_iterate(f, RAM_CONTROL_FINISH); | |
765 | ||
766 | /* try transferring iterative blocks of memory */ | |
767 | ||
768 | /* flush all remaining blocks regardless of rate limiting */ | |
769 | while (true) { | |
770 | int bytes_sent; | |
771 | ||
772 | bytes_sent = ram_save_block(f, true); | |
773 | /* no more blocks to sent */ | |
774 | if (bytes_sent == 0) { | |
775 | break; | |
776 | } | |
777 | bytes_transferred += bytes_sent; | |
778 | } | |
779 | ||
780 | ram_control_after_iterate(f, RAM_CONTROL_FINISH); | |
781 | migration_end(); | |
782 | ||
783 | qemu_mutex_unlock_ramlist(); | |
784 | qemu_put_be64(f, RAM_SAVE_FLAG_EOS); | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size) | |
790 | { | |
791 | uint64_t remaining_size; | |
792 | ||
793 | remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE; | |
794 | ||
795 | if (remaining_size < max_size) { | |
796 | qemu_mutex_lock_iothread(); | |
797 | migration_bitmap_sync(); | |
798 | qemu_mutex_unlock_iothread(); | |
799 | remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE; | |
800 | } | |
801 | return remaining_size; | |
802 | } | |
803 | ||
804 | static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host) | |
805 | { | |
806 | int ret, rc = 0; | |
807 | unsigned int xh_len; | |
808 | int xh_flags; | |
809 | ||
810 | if (!XBZRLE.decoded_buf) { | |
811 | XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE); | |
812 | } | |
813 | ||
814 | /* extract RLE header */ | |
815 | xh_flags = qemu_get_byte(f); | |
816 | xh_len = qemu_get_be16(f); | |
817 | ||
818 | if (xh_flags != ENCODING_FLAG_XBZRLE) { | |
819 | fprintf(stderr, "Failed to load XBZRLE page - wrong compression!\n"); | |
820 | return -1; | |
821 | } | |
822 | ||
823 | if (xh_len > TARGET_PAGE_SIZE) { | |
824 | fprintf(stderr, "Failed to load XBZRLE page - len overflow!\n"); | |
825 | return -1; | |
826 | } | |
827 | /* load data and decode */ | |
828 | qemu_get_buffer(f, XBZRLE.decoded_buf, xh_len); | |
829 | ||
830 | /* decode RLE */ | |
831 | ret = xbzrle_decode_buffer(XBZRLE.decoded_buf, xh_len, host, | |
832 | TARGET_PAGE_SIZE); | |
833 | if (ret == -1) { | |
834 | fprintf(stderr, "Failed to load XBZRLE page - decode error!\n"); | |
835 | rc = -1; | |
836 | } else if (ret > TARGET_PAGE_SIZE) { | |
837 | fprintf(stderr, "Failed to load XBZRLE page - size %d exceeds %d!\n", | |
838 | ret, TARGET_PAGE_SIZE); | |
839 | abort(); | |
840 | } | |
841 | ||
842 | return rc; | |
843 | } | |
844 | ||
845 | static inline void *host_from_stream_offset(QEMUFile *f, | |
846 | ram_addr_t offset, | |
847 | int flags) | |
848 | { | |
849 | static RAMBlock *block = NULL; | |
850 | char id[256]; | |
851 | uint8_t len; | |
852 | ||
853 | if (flags & RAM_SAVE_FLAG_CONTINUE) { | |
854 | if (!block) { | |
855 | fprintf(stderr, "Ack, bad migration stream!\n"); | |
856 | return NULL; | |
857 | } | |
858 | ||
859 | return memory_region_get_ram_ptr(block->mr) + offset; | |
860 | } | |
861 | ||
862 | len = qemu_get_byte(f); | |
863 | qemu_get_buffer(f, (uint8_t *)id, len); | |
864 | id[len] = 0; | |
865 | ||
866 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
867 | if (!strncmp(id, block->idstr, sizeof(id))) | |
868 | return memory_region_get_ram_ptr(block->mr) + offset; | |
869 | } | |
870 | ||
871 | fprintf(stderr, "Can't find block %s!\n", id); | |
872 | return NULL; | |
873 | } | |
874 | ||
875 | /* | |
876 | * If a page (or a whole RDMA chunk) has been | |
877 | * determined to be zero, then zap it. | |
878 | */ | |
879 | void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) | |
880 | { | |
881 | if (ch != 0 || !is_zero_range(host, size)) { | |
882 | memset(host, ch, size); | |
883 | } | |
884 | } | |
885 | ||
886 | static int ram_load(QEMUFile *f, void *opaque, int version_id) | |
887 | { | |
888 | ram_addr_t addr; | |
889 | int flags, ret = 0; | |
890 | int error; | |
891 | static uint64_t seq_iter; | |
892 | ||
893 | seq_iter++; | |
894 | ||
895 | if (version_id < 4 || version_id > 4) { | |
896 | return -EINVAL; | |
897 | } | |
898 | ||
899 | do { | |
900 | addr = qemu_get_be64(f); | |
901 | ||
902 | flags = addr & ~TARGET_PAGE_MASK; | |
903 | addr &= TARGET_PAGE_MASK; | |
904 | ||
905 | if (flags & RAM_SAVE_FLAG_MEM_SIZE) { | |
906 | if (version_id == 4) { | |
907 | /* Synchronize RAM block list */ | |
908 | char id[256]; | |
909 | ram_addr_t length; | |
910 | ram_addr_t total_ram_bytes = addr; | |
911 | ||
912 | while (total_ram_bytes) { | |
913 | RAMBlock *block; | |
914 | uint8_t len; | |
915 | ||
916 | len = qemu_get_byte(f); | |
917 | qemu_get_buffer(f, (uint8_t *)id, len); | |
918 | id[len] = 0; | |
919 | length = qemu_get_be64(f); | |
920 | ||
921 | QTAILQ_FOREACH(block, &ram_list.blocks, next) { | |
922 | if (!strncmp(id, block->idstr, sizeof(id))) { | |
923 | if (block->length != length) { | |
924 | fprintf(stderr, | |
925 | "Length mismatch: %s: " RAM_ADDR_FMT | |
926 | " in != " RAM_ADDR_FMT "\n", id, length, | |
927 | block->length); | |
928 | ret = -EINVAL; | |
929 | goto done; | |
930 | } | |
931 | break; | |
932 | } | |
933 | } | |
934 | ||
935 | if (!block) { | |
936 | fprintf(stderr, "Unknown ramblock \"%s\", cannot " | |
937 | "accept migration\n", id); | |
938 | ret = -EINVAL; | |
939 | goto done; | |
940 | } | |
941 | ||
942 | total_ram_bytes -= length; | |
943 | } | |
944 | } | |
945 | } | |
946 | ||
947 | if (flags & RAM_SAVE_FLAG_COMPRESS) { | |
948 | void *host; | |
949 | uint8_t ch; | |
950 | ||
951 | host = host_from_stream_offset(f, addr, flags); | |
952 | if (!host) { | |
953 | return -EINVAL; | |
954 | } | |
955 | ||
956 | ch = qemu_get_byte(f); | |
957 | ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); | |
958 | } else if (flags & RAM_SAVE_FLAG_PAGE) { | |
959 | void *host; | |
960 | ||
961 | host = host_from_stream_offset(f, addr, flags); | |
962 | if (!host) { | |
963 | return -EINVAL; | |
964 | } | |
965 | ||
966 | qemu_get_buffer(f, host, TARGET_PAGE_SIZE); | |
967 | } else if (flags & RAM_SAVE_FLAG_XBZRLE) { | |
968 | void *host = host_from_stream_offset(f, addr, flags); | |
969 | if (!host) { | |
970 | return -EINVAL; | |
971 | } | |
972 | ||
973 | if (load_xbzrle(f, addr, host) < 0) { | |
974 | ret = -EINVAL; | |
975 | goto done; | |
976 | } | |
977 | } else if (flags & RAM_SAVE_FLAG_HOOK) { | |
978 | ram_control_load_hook(f, flags); | |
979 | } | |
980 | error = qemu_file_get_error(f); | |
981 | if (error) { | |
982 | ret = error; | |
983 | goto done; | |
984 | } | |
985 | } while (!(flags & RAM_SAVE_FLAG_EOS)); | |
986 | ||
987 | done: | |
988 | DPRINTF("Completed load of VM with exit code %d seq iteration " | |
989 | "%" PRIu64 "\n", ret, seq_iter); | |
990 | return ret; | |
991 | } | |
992 | ||
993 | SaveVMHandlers savevm_ram_handlers = { | |
994 | .save_live_setup = ram_save_setup, | |
995 | .save_live_iterate = ram_save_iterate, | |
996 | .save_live_complete = ram_save_complete, | |
997 | .save_live_pending = ram_save_pending, | |
998 | .load_state = ram_load, | |
999 | .cancel = ram_migration_cancel, | |
1000 | }; | |
1001 | ||
1002 | struct soundhw { | |
1003 | const char *name; | |
1004 | const char *descr; | |
1005 | int enabled; | |
1006 | int isa; | |
1007 | union { | |
1008 | int (*init_isa) (ISABus *bus); | |
1009 | int (*init_pci) (PCIBus *bus); | |
1010 | } init; | |
1011 | }; | |
1012 | ||
1013 | static struct soundhw soundhw[9]; | |
1014 | static int soundhw_count; | |
1015 | ||
1016 | void isa_register_soundhw(const char *name, const char *descr, | |
1017 | int (*init_isa)(ISABus *bus)) | |
1018 | { | |
1019 | assert(soundhw_count < ARRAY_SIZE(soundhw) - 1); | |
1020 | soundhw[soundhw_count].name = name; | |
1021 | soundhw[soundhw_count].descr = descr; | |
1022 | soundhw[soundhw_count].isa = 1; | |
1023 | soundhw[soundhw_count].init.init_isa = init_isa; | |
1024 | soundhw_count++; | |
1025 | } | |
1026 | ||
1027 | void pci_register_soundhw(const char *name, const char *descr, | |
1028 | int (*init_pci)(PCIBus *bus)) | |
1029 | { | |
1030 | assert(soundhw_count < ARRAY_SIZE(soundhw) - 1); | |
1031 | soundhw[soundhw_count].name = name; | |
1032 | soundhw[soundhw_count].descr = descr; | |
1033 | soundhw[soundhw_count].isa = 0; | |
1034 | soundhw[soundhw_count].init.init_pci = init_pci; | |
1035 | soundhw_count++; | |
1036 | } | |
1037 | ||
1038 | void select_soundhw(const char *optarg) | |
1039 | { | |
1040 | struct soundhw *c; | |
1041 | ||
1042 | if (is_help_option(optarg)) { | |
1043 | show_valid_cards: | |
1044 | ||
1045 | if (soundhw_count) { | |
1046 | printf("Valid sound card names (comma separated):\n"); | |
1047 | for (c = soundhw; c->name; ++c) { | |
1048 | printf ("%-11s %s\n", c->name, c->descr); | |
1049 | } | |
1050 | printf("\n-soundhw all will enable all of the above\n"); | |
1051 | } else { | |
1052 | printf("Machine has no user-selectable audio hardware " | |
1053 | "(it may or may not have always-present audio hardware).\n"); | |
1054 | } | |
1055 | exit(!is_help_option(optarg)); | |
1056 | } | |
1057 | else { | |
1058 | size_t l; | |
1059 | const char *p; | |
1060 | char *e; | |
1061 | int bad_card = 0; | |
1062 | ||
1063 | if (!strcmp(optarg, "all")) { | |
1064 | for (c = soundhw; c->name; ++c) { | |
1065 | c->enabled = 1; | |
1066 | } | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | p = optarg; | |
1071 | while (*p) { | |
1072 | e = strchr(p, ','); | |
1073 | l = !e ? strlen(p) : (size_t) (e - p); | |
1074 | ||
1075 | for (c = soundhw; c->name; ++c) { | |
1076 | if (!strncmp(c->name, p, l) && !c->name[l]) { | |
1077 | c->enabled = 1; | |
1078 | break; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | if (!c->name) { | |
1083 | if (l > 80) { | |
1084 | fprintf(stderr, | |
1085 | "Unknown sound card name (too big to show)\n"); | |
1086 | } | |
1087 | else { | |
1088 | fprintf(stderr, "Unknown sound card name `%.*s'\n", | |
1089 | (int) l, p); | |
1090 | } | |
1091 | bad_card = 1; | |
1092 | } | |
1093 | p += l + (e != NULL); | |
1094 | } | |
1095 | ||
1096 | if (bad_card) { | |
1097 | goto show_valid_cards; | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | void audio_init(void) | |
1103 | { | |
1104 | struct soundhw *c; | |
1105 | ISABus *isa_bus = (ISABus *) object_resolve_path_type("", TYPE_ISA_BUS, NULL); | |
1106 | PCIBus *pci_bus = (PCIBus *) object_resolve_path_type("", TYPE_PCI_BUS, NULL); | |
1107 | ||
1108 | for (c = soundhw; c->name; ++c) { | |
1109 | if (c->enabled) { | |
1110 | if (c->isa) { | |
1111 | if (!isa_bus) { | |
1112 | fprintf(stderr, "ISA bus not available for %s\n", c->name); | |
1113 | exit(1); | |
1114 | } | |
1115 | c->init.init_isa(isa_bus); | |
1116 | } else { | |
1117 | if (!pci_bus) { | |
1118 | fprintf(stderr, "PCI bus not available for %s\n", c->name); | |
1119 | exit(1); | |
1120 | } | |
1121 | c->init.init_pci(pci_bus); | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | int qemu_uuid_parse(const char *str, uint8_t *uuid) | |
1128 | { | |
1129 | int ret; | |
1130 | ||
1131 | if (strlen(str) != 36) { | |
1132 | return -1; | |
1133 | } | |
1134 | ||
1135 | ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3], | |
1136 | &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9], | |
1137 | &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14], | |
1138 | &uuid[15]); | |
1139 | ||
1140 | if (ret != 16) { | |
1141 | return -1; | |
1142 | } | |
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | void do_acpitable_option(const QemuOpts *opts) | |
1147 | { | |
1148 | #ifdef TARGET_I386 | |
1149 | Error *err = NULL; | |
1150 | ||
1151 | acpi_table_add(opts, &err); | |
1152 | if (err) { | |
1153 | error_report("Wrong acpi table provided: %s", | |
1154 | error_get_pretty(err)); | |
1155 | error_free(err); | |
1156 | exit(1); | |
1157 | } | |
1158 | #endif | |
1159 | } | |
1160 | ||
1161 | void do_smbios_option(QemuOpts *opts) | |
1162 | { | |
1163 | #ifdef TARGET_I386 | |
1164 | smbios_entry_add(opts); | |
1165 | #endif | |
1166 | } | |
1167 | ||
1168 | void cpudef_init(void) | |
1169 | { | |
1170 | #if defined(cpudef_setup) | |
1171 | cpudef_setup(); /* parse cpu definitions in target config file */ | |
1172 | #endif | |
1173 | } | |
1174 | ||
1175 | int tcg_available(void) | |
1176 | { | |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | int kvm_available(void) | |
1181 | { | |
1182 | #ifdef CONFIG_KVM | |
1183 | return 1; | |
1184 | #else | |
1185 | return 0; | |
1186 | #endif | |
1187 | } | |
1188 | ||
1189 | int xen_available(void) | |
1190 | { | |
1191 | #ifdef CONFIG_XEN | |
1192 | return 1; | |
1193 | #else | |
1194 | return 0; | |
1195 | #endif | |
1196 | } | |
1197 | ||
1198 | ||
1199 | TargetInfo *qmp_query_target(Error **errp) | |
1200 | { | |
1201 | TargetInfo *info = g_malloc0(sizeof(*info)); | |
1202 | ||
1203 | info->arch = g_strdup(TARGET_NAME); | |
1204 | ||
1205 | return info; | |
1206 | } | |
1207 | ||
1208 | /* Stub function that's gets run on the vcpu when its brought out of the | |
1209 | VM to run inside qemu via async_run_on_cpu()*/ | |
1210 | static void mig_sleep_cpu(void *opq) | |
1211 | { | |
1212 | qemu_mutex_unlock_iothread(); | |
1213 | g_usleep(30*1000); | |
1214 | qemu_mutex_lock_iothread(); | |
1215 | } | |
1216 | ||
1217 | /* To reduce the dirty rate explicitly disallow the VCPUs from spending | |
1218 | much time in the VM. The migration thread will try to catchup. | |
1219 | Workload will experience a performance drop. | |
1220 | */ | |
1221 | static void mig_throttle_guest_down(void) | |
1222 | { | |
1223 | CPUState *cpu; | |
1224 | ||
1225 | qemu_mutex_lock_iothread(); | |
1226 | CPU_FOREACH(cpu) { | |
1227 | async_run_on_cpu(cpu, mig_sleep_cpu, NULL); | |
1228 | } | |
1229 | qemu_mutex_unlock_iothread(); | |
1230 | } | |
1231 | ||
1232 | static void check_guest_throttling(void) | |
1233 | { | |
1234 | static int64_t t0; | |
1235 | int64_t t1; | |
1236 | ||
1237 | if (!mig_throttle_on) { | |
1238 | return; | |
1239 | } | |
1240 | ||
1241 | if (!t0) { | |
1242 | t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | t1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); | |
1247 | ||
1248 | /* If it has been more than 40 ms since the last time the guest | |
1249 | * was throttled then do it again. | |
1250 | */ | |
1251 | if (40 < (t1-t0)/1000000) { | |
1252 | mig_throttle_guest_down(); | |
1253 | t0 = t1; | |
1254 | } | |
1255 | } |