4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
28 #include <sys/types.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"
50 #include "exec/cpu-all.h"
51 #include "exec/ram_addr.h"
52 #include "hw/acpi/acpi.h"
53 #include "qemu/host-utils.h"
55 #ifdef DEBUG_ARCH_INIT
56 #define DPRINTF(fmt, ...) \
57 do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0)
59 #define DPRINTF(fmt, ...) \
64 int graphic_width
= 1024;
65 int graphic_height
= 768;
66 int graphic_depth
= 8;
68 int graphic_width
= 800;
69 int graphic_height
= 600;
70 int graphic_depth
= 32;
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
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);
113 /***********************************************************/
114 /* ram save/restore */
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 */
126 static struct defconfig_file
{
127 const char *filename
;
128 /* Indicates it is an user config file (disabled by -no-user-config) */
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 */
137 int qemu_read_default_config_files(bool userconfig
)
140 struct defconfig_file
*f
;
142 for (f
= default_config_files
; f
->filename
; f
++) {
143 if (!userconfig
&& f
->userconfig
) {
146 ret
= qemu_read_config_file(f
->filename
);
147 if (ret
< 0 && ret
!= -ENOENT
) {
155 static inline bool is_zero_range(uint8_t *p
, uint64_t size
)
157 return buffer_find_nonzero_offset(p
, size
) == size
;
160 /* struct contains XBZRLE cache and a static page
161 used by the compression */
163 /* buffer used for XBZRLE encoding */
164 uint8_t *encoded_buf
;
165 /* buffer for storing page content */
166 uint8_t *current_buf
;
167 /* Cache for XBZRLE */
174 /* buffer used for XBZRLE decoding */
175 static uint8_t *xbzrle_decoded_buf
;
177 int64_t xbzrle_cache_resize(int64_t new_size
)
179 if (new_size
< TARGET_PAGE_SIZE
) {
183 if (XBZRLE
.cache
!= NULL
) {
184 return cache_resize(XBZRLE
.cache
, new_size
/ TARGET_PAGE_SIZE
) *
187 return pow2floor(new_size
);
190 /* accounting for migration statistics */
191 typedef struct AccountingInfo
{
193 uint64_t skipped_pages
;
196 uint64_t xbzrle_bytes
;
197 uint64_t xbzrle_pages
;
198 uint64_t xbzrle_cache_miss
;
199 uint64_t xbzrle_overflows
;
202 static AccountingInfo acct_info
;
204 static void acct_clear(void)
206 memset(&acct_info
, 0, sizeof(acct_info
));
209 uint64_t dup_mig_bytes_transferred(void)
211 return acct_info
.dup_pages
* TARGET_PAGE_SIZE
;
214 uint64_t dup_mig_pages_transferred(void)
216 return acct_info
.dup_pages
;
219 uint64_t skipped_mig_bytes_transferred(void)
221 return acct_info
.skipped_pages
* TARGET_PAGE_SIZE
;
224 uint64_t skipped_mig_pages_transferred(void)
226 return acct_info
.skipped_pages
;
229 uint64_t norm_mig_bytes_transferred(void)
231 return acct_info
.norm_pages
* TARGET_PAGE_SIZE
;
234 uint64_t norm_mig_pages_transferred(void)
236 return acct_info
.norm_pages
;
239 uint64_t xbzrle_mig_bytes_transferred(void)
241 return acct_info
.xbzrle_bytes
;
244 uint64_t xbzrle_mig_pages_transferred(void)
246 return acct_info
.xbzrle_pages
;
249 uint64_t xbzrle_mig_pages_cache_miss(void)
251 return acct_info
.xbzrle_cache_miss
;
254 uint64_t xbzrle_mig_pages_overflow(void)
256 return acct_info
.xbzrle_overflows
;
259 static size_t save_block_hdr(QEMUFile
*f
, RAMBlock
*block
, ram_addr_t offset
,
264 qemu_put_be64(f
, offset
| cont
| flag
);
268 qemu_put_byte(f
, strlen(block
->idstr
));
269 qemu_put_buffer(f
, (uint8_t *)block
->idstr
,
270 strlen(block
->idstr
));
271 size
+= 1 + strlen(block
->idstr
);
276 #define ENCODING_FLAG_XBZRLE 0x1
278 static int save_xbzrle_page(QEMUFile
*f
, uint8_t *current_data
,
279 ram_addr_t current_addr
, RAMBlock
*block
,
280 ram_addr_t offset
, int cont
, bool last_stage
)
282 int encoded_len
= 0, bytes_sent
= -1;
283 uint8_t *prev_cached_page
;
285 if (!cache_is_cached(XBZRLE
.cache
, current_addr
)) {
287 cache_insert(XBZRLE
.cache
, current_addr
, current_data
);
289 acct_info
.xbzrle_cache_miss
++;
293 prev_cached_page
= get_cached_data(XBZRLE
.cache
, current_addr
);
295 /* save current buffer into memory */
296 memcpy(XBZRLE
.current_buf
, current_data
, TARGET_PAGE_SIZE
);
298 /* XBZRLE encoding (if there is no overflow) */
299 encoded_len
= xbzrle_encode_buffer(prev_cached_page
, XBZRLE
.current_buf
,
300 TARGET_PAGE_SIZE
, XBZRLE
.encoded_buf
,
302 if (encoded_len
== 0) {
303 DPRINTF("Skipping unmodified page\n");
305 } else if (encoded_len
== -1) {
306 DPRINTF("Overflow\n");
307 acct_info
.xbzrle_overflows
++;
308 /* update data in the cache */
309 memcpy(prev_cached_page
, current_data
, TARGET_PAGE_SIZE
);
313 /* we need to update the data in the cache, in order to get the same data */
315 memcpy(prev_cached_page
, XBZRLE
.current_buf
, TARGET_PAGE_SIZE
);
318 /* Send XBZRLE based compressed page */
319 bytes_sent
= save_block_hdr(f
, block
, offset
, cont
, RAM_SAVE_FLAG_XBZRLE
);
320 qemu_put_byte(f
, ENCODING_FLAG_XBZRLE
);
321 qemu_put_be16(f
, encoded_len
);
322 qemu_put_buffer(f
, XBZRLE
.encoded_buf
, encoded_len
);
323 bytes_sent
+= encoded_len
+ 1 + 2;
324 acct_info
.xbzrle_pages
++;
325 acct_info
.xbzrle_bytes
+= bytes_sent
;
331 /* This is the last block that we have visited serching for dirty pages
333 static RAMBlock
*last_seen_block
;
334 /* This is the last block from where we have sent data */
335 static RAMBlock
*last_sent_block
;
336 static ram_addr_t last_offset
;
337 static unsigned long *migration_bitmap
;
338 static uint64_t migration_dirty_pages
;
339 static uint32_t last_version
;
340 static bool ram_bulk_stage
;
343 ram_addr_t
migration_bitmap_find_and_reset_dirty(MemoryRegion
*mr
,
346 unsigned long base
= mr
->ram_addr
>> TARGET_PAGE_BITS
;
347 unsigned long nr
= base
+ (start
>> TARGET_PAGE_BITS
);
348 uint64_t mr_size
= TARGET_PAGE_ALIGN(memory_region_size(mr
));
349 unsigned long size
= base
+ (mr_size
>> TARGET_PAGE_BITS
);
353 if (ram_bulk_stage
&& nr
> base
) {
356 next
= find_next_bit(migration_bitmap
, size
, nr
);
360 clear_bit(next
, migration_bitmap
);
361 migration_dirty_pages
--;
363 return (next
- base
) << TARGET_PAGE_BITS
;
366 static inline bool migration_bitmap_set_dirty(ram_addr_t addr
)
369 int nr
= addr
>> TARGET_PAGE_BITS
;
371 ret
= test_and_set_bit(nr
, migration_bitmap
);
374 migration_dirty_pages
++;
379 static void migration_bitmap_sync_range(ram_addr_t start
, ram_addr_t length
)
382 unsigned long page
= BIT_WORD(start
>> TARGET_PAGE_BITS
);
384 /* start address is aligned at the start of a word? */
385 if (((page
* BITS_PER_LONG
) << TARGET_PAGE_BITS
) == start
) {
387 int nr
= BITS_TO_LONGS(length
>> TARGET_PAGE_BITS
);
388 unsigned long *src
= ram_list
.dirty_memory
[DIRTY_MEMORY_MIGRATION
];
390 for (k
= page
; k
< page
+ nr
; k
++) {
392 unsigned long new_dirty
;
393 new_dirty
= ~migration_bitmap
[k
];
394 migration_bitmap
[k
] |= src
[k
];
396 migration_dirty_pages
+= ctpopl(new_dirty
);
401 for (addr
= 0; addr
< length
; addr
+= TARGET_PAGE_SIZE
) {
402 if (cpu_physical_memory_get_dirty(start
+ addr
,
404 DIRTY_MEMORY_MIGRATION
)) {
405 cpu_physical_memory_reset_dirty(start
+ addr
,
407 DIRTY_MEMORY_MIGRATION
);
408 migration_bitmap_set_dirty(start
+ addr
);
415 /* Needs iothread lock! */
417 static void migration_bitmap_sync(void)
420 uint64_t num_dirty_pages_init
= migration_dirty_pages
;
421 MigrationState
*s
= migrate_get_current();
422 static int64_t start_time
;
423 static int64_t bytes_xfer_prev
;
424 static int64_t num_dirty_pages_period
;
426 int64_t bytes_xfer_now
;
428 if (!bytes_xfer_prev
) {
429 bytes_xfer_prev
= ram_bytes_transferred();
433 start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
436 trace_migration_bitmap_sync_start();
437 address_space_sync_dirty_bitmap(&address_space_memory
);
439 QTAILQ_FOREACH(block
, &ram_list
.blocks
, next
) {
440 migration_bitmap_sync_range(block
->mr
->ram_addr
, block
->length
);
442 trace_migration_bitmap_sync_end(migration_dirty_pages
443 - num_dirty_pages_init
);
444 num_dirty_pages_period
+= migration_dirty_pages
- num_dirty_pages_init
;
445 end_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
447 /* more than 1 second = 1000 millisecons */
448 if (end_time
> start_time
+ 1000) {
449 if (migrate_auto_converge()) {
450 /* The following detection logic can be refined later. For now:
451 Check to see if the dirtied bytes is 50% more than the approx.
452 amount of bytes that just got transferred since the last time we
453 were in this routine. If that happens >N times (for now N==4)
454 we turn on the throttle down logic */
455 bytes_xfer_now
= ram_bytes_transferred();
456 if (s
->dirty_pages_rate
&&
457 (num_dirty_pages_period
* TARGET_PAGE_SIZE
>
458 (bytes_xfer_now
- bytes_xfer_prev
)/2) &&
459 (dirty_rate_high_cnt
++ > 4)) {
460 trace_migration_throttle();
461 mig_throttle_on
= true;
462 dirty_rate_high_cnt
= 0;
464 bytes_xfer_prev
= bytes_xfer_now
;
466 mig_throttle_on
= false;
468 s
->dirty_pages_rate
= num_dirty_pages_period
* 1000
469 / (end_time
- start_time
);
470 s
->dirty_bytes_rate
= s
->dirty_pages_rate
* TARGET_PAGE_SIZE
;
471 start_time
= end_time
;
472 num_dirty_pages_period
= 0;
477 * ram_save_block: Writes a page of memory to the stream f
479 * Returns: The number of bytes written.
480 * 0 means no dirty pages
483 static int ram_save_block(QEMUFile
*f
, bool last_stage
)
485 RAMBlock
*block
= last_seen_block
;
486 ram_addr_t offset
= last_offset
;
487 bool complete_round
= false;
490 ram_addr_t current_addr
;
493 block
= QTAILQ_FIRST(&ram_list
.blocks
);
497 offset
= migration_bitmap_find_and_reset_dirty(mr
, offset
);
498 if (complete_round
&& block
== last_seen_block
&&
499 offset
>= last_offset
) {
502 if (offset
>= block
->length
) {
504 block
= QTAILQ_NEXT(block
, next
);
506 block
= QTAILQ_FIRST(&ram_list
.blocks
);
507 complete_round
= true;
508 ram_bulk_stage
= false;
513 int cont
= (block
== last_sent_block
) ?
514 RAM_SAVE_FLAG_CONTINUE
: 0;
516 p
= memory_region_get_ram_ptr(mr
) + offset
;
518 /* In doubt sent page as normal */
520 ret
= ram_control_save_page(f
, block
->offset
,
521 offset
, TARGET_PAGE_SIZE
, &bytes_sent
);
523 if (ret
!= RAM_SAVE_CONTROL_NOT_SUPP
) {
524 if (ret
!= RAM_SAVE_CONTROL_DELAYED
) {
525 if (bytes_sent
> 0) {
526 acct_info
.norm_pages
++;
527 } else if (bytes_sent
== 0) {
528 acct_info
.dup_pages
++;
531 } else if (is_zero_range(p
, TARGET_PAGE_SIZE
)) {
532 acct_info
.dup_pages
++;
533 bytes_sent
= save_block_hdr(f
, block
, offset
, cont
,
534 RAM_SAVE_FLAG_COMPRESS
);
537 } else if (!ram_bulk_stage
&& migrate_use_xbzrle()) {
538 current_addr
= block
->offset
+ offset
;
539 bytes_sent
= save_xbzrle_page(f
, p
, current_addr
, block
,
540 offset
, cont
, last_stage
);
542 p
= get_cached_data(XBZRLE
.cache
, current_addr
);
546 /* XBZRLE overflow or normal page */
547 if (bytes_sent
== -1) {
548 bytes_sent
= save_block_hdr(f
, block
, offset
, cont
, RAM_SAVE_FLAG_PAGE
);
549 qemu_put_buffer_async(f
, p
, TARGET_PAGE_SIZE
);
550 bytes_sent
+= TARGET_PAGE_SIZE
;
551 acct_info
.norm_pages
++;
554 /* if page is unmodified, continue to the next */
555 if (bytes_sent
> 0) {
556 last_sent_block
= block
;
561 last_seen_block
= block
;
562 last_offset
= offset
;
567 static uint64_t bytes_transferred
;
569 void acct_update_position(QEMUFile
*f
, size_t size
, bool zero
)
571 uint64_t pages
= size
/ TARGET_PAGE_SIZE
;
573 acct_info
.dup_pages
+= pages
;
575 acct_info
.norm_pages
+= pages
;
576 bytes_transferred
+= size
;
577 qemu_update_position(f
, size
);
581 static ram_addr_t
ram_save_remaining(void)
583 return migration_dirty_pages
;
586 uint64_t ram_bytes_remaining(void)
588 return ram_save_remaining() * TARGET_PAGE_SIZE
;
591 uint64_t ram_bytes_transferred(void)
593 return bytes_transferred
;
596 uint64_t ram_bytes_total(void)
601 QTAILQ_FOREACH(block
, &ram_list
.blocks
, next
)
602 total
+= block
->length
;
607 void free_xbzrle_decoded_buf(void)
609 g_free(xbzrle_decoded_buf
);
610 xbzrle_decoded_buf
= NULL
;
613 static void migration_end(void)
615 if (migration_bitmap
) {
616 memory_global_dirty_log_stop();
617 g_free(migration_bitmap
);
618 migration_bitmap
= NULL
;
622 cache_fini(XBZRLE
.cache
);
623 g_free(XBZRLE
.cache
);
624 g_free(XBZRLE
.encoded_buf
);
625 g_free(XBZRLE
.current_buf
);
627 XBZRLE
.encoded_buf
= NULL
;
628 XBZRLE
.current_buf
= NULL
;
632 static void ram_migration_cancel(void *opaque
)
637 static void reset_ram_globals(void)
639 last_seen_block
= NULL
;
640 last_sent_block
= NULL
;
642 last_version
= ram_list
.version
;
643 ram_bulk_stage
= true;
646 #define MAX_WAIT 50 /* ms, half buffered_file limit */
648 static int ram_save_setup(QEMUFile
*f
, void *opaque
)
651 int64_t ram_pages
= last_ram_offset() >> TARGET_PAGE_BITS
;
653 migration_bitmap
= bitmap_new(ram_pages
);
654 bitmap_set(migration_bitmap
, 0, ram_pages
);
655 migration_dirty_pages
= ram_pages
;
656 mig_throttle_on
= false;
657 dirty_rate_high_cnt
= 0;
659 if (migrate_use_xbzrle()) {
660 XBZRLE
.cache
= cache_init(migrate_xbzrle_cache_size() /
664 DPRINTF("Error creating cache\n");
668 /* We prefer not to abort if there is no memory */
669 XBZRLE
.encoded_buf
= g_try_malloc0(TARGET_PAGE_SIZE
);
670 if (!XBZRLE
.encoded_buf
) {
671 DPRINTF("Error allocating encoded_buf\n");
675 XBZRLE
.current_buf
= g_try_malloc(TARGET_PAGE_SIZE
);
676 if (!XBZRLE
.current_buf
) {
677 DPRINTF("Error allocating current_buf\n");
678 g_free(XBZRLE
.encoded_buf
);
679 XBZRLE
.encoded_buf
= NULL
;
686 qemu_mutex_lock_iothread();
687 qemu_mutex_lock_ramlist();
688 bytes_transferred
= 0;
691 memory_global_dirty_log_start();
692 migration_bitmap_sync();
693 qemu_mutex_unlock_iothread();
695 qemu_put_be64(f
, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE
);
697 QTAILQ_FOREACH(block
, &ram_list
.blocks
, next
) {
698 qemu_put_byte(f
, strlen(block
->idstr
));
699 qemu_put_buffer(f
, (uint8_t *)block
->idstr
, strlen(block
->idstr
));
700 qemu_put_be64(f
, block
->length
);
703 qemu_mutex_unlock_ramlist();
705 ram_control_before_iterate(f
, RAM_CONTROL_SETUP
);
706 ram_control_after_iterate(f
, RAM_CONTROL_SETUP
);
708 qemu_put_be64(f
, RAM_SAVE_FLAG_EOS
);
713 static int ram_save_iterate(QEMUFile
*f
, void *opaque
)
720 qemu_mutex_lock_ramlist();
722 if (ram_list
.version
!= last_version
) {
726 ram_control_before_iterate(f
, RAM_CONTROL_ROUND
);
728 t0
= qemu_clock_get_ns(QEMU_CLOCK_REALTIME
);
730 while ((ret
= qemu_file_rate_limit(f
)) == 0) {
733 bytes_sent
= ram_save_block(f
, false);
734 /* no more blocks to sent */
735 if (bytes_sent
== 0) {
738 total_sent
+= bytes_sent
;
739 acct_info
.iterations
++;
740 check_guest_throttling();
741 /* we want to check in the 1st loop, just in case it was the 1st time
742 and we had to sync the dirty bitmap.
743 qemu_get_clock_ns() is a bit expensive, so we only check each some
747 uint64_t t1
= (qemu_clock_get_ns(QEMU_CLOCK_REALTIME
) - t0
) / 1000000;
749 DPRINTF("big wait: %" PRIu64
" milliseconds, %d iterations\n",
757 qemu_mutex_unlock_ramlist();
760 * Must occur before EOS (or any QEMUFile operation)
761 * because of RDMA protocol.
763 ram_control_after_iterate(f
, RAM_CONTROL_ROUND
);
765 bytes_transferred
+= total_sent
;
768 * Do not count these 8 bytes into total_sent, so that we can
769 * return 0 if no page had been dirtied.
771 qemu_put_be64(f
, RAM_SAVE_FLAG_EOS
);
772 bytes_transferred
+= 8;
774 ret
= qemu_file_get_error(f
);
782 static int ram_save_complete(QEMUFile
*f
, void *opaque
)
784 qemu_mutex_lock_ramlist();
785 migration_bitmap_sync();
787 ram_control_before_iterate(f
, RAM_CONTROL_FINISH
);
789 /* try transferring iterative blocks of memory */
791 /* flush all remaining blocks regardless of rate limiting */
795 bytes_sent
= ram_save_block(f
, true);
796 /* no more blocks to sent */
797 if (bytes_sent
== 0) {
800 bytes_transferred
+= bytes_sent
;
803 ram_control_after_iterate(f
, RAM_CONTROL_FINISH
);
806 qemu_mutex_unlock_ramlist();
807 qemu_put_be64(f
, RAM_SAVE_FLAG_EOS
);
812 static uint64_t ram_save_pending(QEMUFile
*f
, void *opaque
, uint64_t max_size
)
814 uint64_t remaining_size
;
816 remaining_size
= ram_save_remaining() * TARGET_PAGE_SIZE
;
818 if (remaining_size
< max_size
) {
819 qemu_mutex_lock_iothread();
820 migration_bitmap_sync();
821 qemu_mutex_unlock_iothread();
822 remaining_size
= ram_save_remaining() * TARGET_PAGE_SIZE
;
824 return remaining_size
;
827 static int load_xbzrle(QEMUFile
*f
, ram_addr_t addr
, void *host
)
833 if (!xbzrle_decoded_buf
) {
834 xbzrle_decoded_buf
= g_malloc(TARGET_PAGE_SIZE
);
837 /* extract RLE header */
838 xh_flags
= qemu_get_byte(f
);
839 xh_len
= qemu_get_be16(f
);
841 if (xh_flags
!= ENCODING_FLAG_XBZRLE
) {
842 fprintf(stderr
, "Failed to load XBZRLE page - wrong compression!\n");
846 if (xh_len
> TARGET_PAGE_SIZE
) {
847 fprintf(stderr
, "Failed to load XBZRLE page - len overflow!\n");
850 /* load data and decode */
851 qemu_get_buffer(f
, xbzrle_decoded_buf
, xh_len
);
854 ret
= xbzrle_decode_buffer(xbzrle_decoded_buf
, xh_len
, host
,
857 fprintf(stderr
, "Failed to load XBZRLE page - decode error!\n");
859 } else if (ret
> TARGET_PAGE_SIZE
) {
860 fprintf(stderr
, "Failed to load XBZRLE page - size %d exceeds %d!\n",
861 ret
, TARGET_PAGE_SIZE
);
868 static inline void *host_from_stream_offset(QEMUFile
*f
,
872 static RAMBlock
*block
= NULL
;
876 if (flags
& RAM_SAVE_FLAG_CONTINUE
) {
878 fprintf(stderr
, "Ack, bad migration stream!\n");
882 return memory_region_get_ram_ptr(block
->mr
) + offset
;
885 len
= qemu_get_byte(f
);
886 qemu_get_buffer(f
, (uint8_t *)id
, len
);
889 QTAILQ_FOREACH(block
, &ram_list
.blocks
, next
) {
890 if (!strncmp(id
, block
->idstr
, sizeof(id
)))
891 return memory_region_get_ram_ptr(block
->mr
) + offset
;
894 fprintf(stderr
, "Can't find block %s!\n", id
);
899 * If a page (or a whole RDMA chunk) has been
900 * determined to be zero, then zap it.
902 void ram_handle_compressed(void *host
, uint8_t ch
, uint64_t size
)
904 if (ch
!= 0 || !is_zero_range(host
, size
)) {
905 memset(host
, ch
, size
);
909 static int ram_load(QEMUFile
*f
, void *opaque
, int version_id
)
914 static uint64_t seq_iter
;
918 if (version_id
< 4 || version_id
> 4) {
923 addr
= qemu_get_be64(f
);
925 flags
= addr
& ~TARGET_PAGE_MASK
;
926 addr
&= TARGET_PAGE_MASK
;
928 if (flags
& RAM_SAVE_FLAG_MEM_SIZE
) {
929 if (version_id
== 4) {
930 /* Synchronize RAM block list */
933 ram_addr_t total_ram_bytes
= addr
;
935 while (total_ram_bytes
) {
939 len
= qemu_get_byte(f
);
940 qemu_get_buffer(f
, (uint8_t *)id
, len
);
942 length
= qemu_get_be64(f
);
944 QTAILQ_FOREACH(block
, &ram_list
.blocks
, next
) {
945 if (!strncmp(id
, block
->idstr
, sizeof(id
))) {
946 if (block
->length
!= length
) {
948 "Length mismatch: %s: " RAM_ADDR_FMT
949 " in != " RAM_ADDR_FMT
"\n", id
, length
,
959 fprintf(stderr
, "Unknown ramblock \"%s\", cannot "
960 "accept migration\n", id
);
965 total_ram_bytes
-= length
;
970 if (flags
& RAM_SAVE_FLAG_COMPRESS
) {
974 host
= host_from_stream_offset(f
, addr
, flags
);
979 ch
= qemu_get_byte(f
);
980 ram_handle_compressed(host
, ch
, TARGET_PAGE_SIZE
);
981 } else if (flags
& RAM_SAVE_FLAG_PAGE
) {
984 host
= host_from_stream_offset(f
, addr
, flags
);
989 qemu_get_buffer(f
, host
, TARGET_PAGE_SIZE
);
990 } else if (flags
& RAM_SAVE_FLAG_XBZRLE
) {
991 void *host
= host_from_stream_offset(f
, addr
, flags
);
996 if (load_xbzrle(f
, addr
, host
) < 0) {
1000 } else if (flags
& RAM_SAVE_FLAG_HOOK
) {
1001 ram_control_load_hook(f
, flags
);
1003 error
= qemu_file_get_error(f
);
1008 } while (!(flags
& RAM_SAVE_FLAG_EOS
));
1011 DPRINTF("Completed load of VM with exit code %d seq iteration "
1012 "%" PRIu64
"\n", ret
, seq_iter
);
1016 SaveVMHandlers savevm_ram_handlers
= {
1017 .save_live_setup
= ram_save_setup
,
1018 .save_live_iterate
= ram_save_iterate
,
1019 .save_live_complete
= ram_save_complete
,
1020 .save_live_pending
= ram_save_pending
,
1021 .load_state
= ram_load
,
1022 .cancel
= ram_migration_cancel
,
1031 int (*init_isa
) (ISABus
*bus
);
1032 int (*init_pci
) (PCIBus
*bus
);
1036 static struct soundhw soundhw
[9];
1037 static int soundhw_count
;
1039 void isa_register_soundhw(const char *name
, const char *descr
,
1040 int (*init_isa
)(ISABus
*bus
))
1042 assert(soundhw_count
< ARRAY_SIZE(soundhw
) - 1);
1043 soundhw
[soundhw_count
].name
= name
;
1044 soundhw
[soundhw_count
].descr
= descr
;
1045 soundhw
[soundhw_count
].isa
= 1;
1046 soundhw
[soundhw_count
].init
.init_isa
= init_isa
;
1050 void pci_register_soundhw(const char *name
, const char *descr
,
1051 int (*init_pci
)(PCIBus
*bus
))
1053 assert(soundhw_count
< ARRAY_SIZE(soundhw
) - 1);
1054 soundhw
[soundhw_count
].name
= name
;
1055 soundhw
[soundhw_count
].descr
= descr
;
1056 soundhw
[soundhw_count
].isa
= 0;
1057 soundhw
[soundhw_count
].init
.init_pci
= init_pci
;
1061 void select_soundhw(const char *optarg
)
1065 if (is_help_option(optarg
)) {
1068 if (soundhw_count
) {
1069 printf("Valid sound card names (comma separated):\n");
1070 for (c
= soundhw
; c
->name
; ++c
) {
1071 printf ("%-11s %s\n", c
->name
, c
->descr
);
1073 printf("\n-soundhw all will enable all of the above\n");
1075 printf("Machine has no user-selectable audio hardware "
1076 "(it may or may not have always-present audio hardware).\n");
1078 exit(!is_help_option(optarg
));
1086 if (!strcmp(optarg
, "all")) {
1087 for (c
= soundhw
; c
->name
; ++c
) {
1096 l
= !e
? strlen(p
) : (size_t) (e
- p
);
1098 for (c
= soundhw
; c
->name
; ++c
) {
1099 if (!strncmp(c
->name
, p
, l
) && !c
->name
[l
]) {
1108 "Unknown sound card name (too big to show)\n");
1111 fprintf(stderr
, "Unknown sound card name `%.*s'\n",
1116 p
+= l
+ (e
!= NULL
);
1120 goto show_valid_cards
;
1125 void audio_init(void)
1128 ISABus
*isa_bus
= (ISABus
*) object_resolve_path_type("", TYPE_ISA_BUS
, NULL
);
1129 PCIBus
*pci_bus
= (PCIBus
*) object_resolve_path_type("", TYPE_PCI_BUS
, NULL
);
1131 for (c
= soundhw
; c
->name
; ++c
) {
1135 fprintf(stderr
, "ISA bus not available for %s\n", c
->name
);
1138 c
->init
.init_isa(isa_bus
);
1141 fprintf(stderr
, "PCI bus not available for %s\n", c
->name
);
1144 c
->init
.init_pci(pci_bus
);
1150 int qemu_uuid_parse(const char *str
, uint8_t *uuid
)
1154 if (strlen(str
) != 36) {
1158 ret
= sscanf(str
, UUID_FMT
, &uuid
[0], &uuid
[1], &uuid
[2], &uuid
[3],
1159 &uuid
[4], &uuid
[5], &uuid
[6], &uuid
[7], &uuid
[8], &uuid
[9],
1160 &uuid
[10], &uuid
[11], &uuid
[12], &uuid
[13], &uuid
[14],
1169 void do_acpitable_option(const QemuOpts
*opts
)
1174 acpi_table_add(opts
, &err
);
1176 error_report("Wrong acpi table provided: %s",
1177 error_get_pretty(err
));
1184 void do_smbios_option(QemuOpts
*opts
)
1187 smbios_entry_add(opts
);
1191 void cpudef_init(void)
1193 #if defined(cpudef_setup)
1194 cpudef_setup(); /* parse cpu definitions in target config file */
1198 int tcg_available(void)
1203 int kvm_available(void)
1212 int xen_available(void)
1222 TargetInfo
*qmp_query_target(Error
**errp
)
1224 TargetInfo
*info
= g_malloc0(sizeof(*info
));
1226 info
->arch
= g_strdup(TARGET_NAME
);
1231 /* Stub function that's gets run on the vcpu when its brought out of the
1232 VM to run inside qemu via async_run_on_cpu()*/
1233 static void mig_sleep_cpu(void *opq
)
1235 qemu_mutex_unlock_iothread();
1237 qemu_mutex_lock_iothread();
1240 /* To reduce the dirty rate explicitly disallow the VCPUs from spending
1241 much time in the VM. The migration thread will try to catchup.
1242 Workload will experience a performance drop.
1244 static void mig_throttle_guest_down(void)
1248 qemu_mutex_lock_iothread();
1250 async_run_on_cpu(cpu
, mig_sleep_cpu
, NULL
);
1252 qemu_mutex_unlock_iothread();
1255 static void check_guest_throttling(void)
1260 if (!mig_throttle_on
) {
1265 t0
= qemu_clock_get_ns(QEMU_CLOCK_REALTIME
);
1269 t1
= qemu_clock_get_ns(QEMU_CLOCK_REALTIME
);
1271 /* If it has been more than 40 ms since the last time the guest
1272 * was throttled then do it again.
1274 if (40 < (t1
-t0
)/1000000) {
1275 mig_throttle_guest_down();