2 * QEMU migration support
4 * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws>
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
26 #include "qemu_socket.h"
33 #define MIN_FINALIZE_SIZE (200 << 10)
34 #define MAX_ITERATIONS 30
35 #define MAX_RAPID_WRITES 5
37 typedef struct MigrationState
43 int last_updated_pages
;
45 int n_buffer
; /* number of bytes in @buffer already sent */
46 int l_buffer
; /* number of bytes in @buffer to send */
49 char buffer
[TARGET_PAGE_SIZE
+ 4 + 4];
54 int (*release
)(void *opaque
);
58 static uint32_t max_throttle
= (32 << 20);
59 static MigrationState
*current_migration
;
60 static int wait_for_message_timeout
= 3000; /* 3 seconds */
61 static int status
; /* last migration status */
63 enum { /* migration status values */
67 MIG_STAT_INVALID_PARAMS
= 1,
68 MIG_STAT_INVALID_ADDR
= 2,
69 MIG_STAT_SOCKET_FAILED
= 3,
70 MIG_STAT_SOCKOPT_FAILED
= 4,
71 MIG_STAT_BIND_FAILED
= 5,
72 MIG_STAT_LISTEN_FAILED
= 6,
73 MIG_STAT_ACCEPT_FAILED
= 7,
74 MIG_STAT_CONNECT_FAILED
= 8,
75 MIG_STAT_WRITE_FAILED
= 9,
76 MIG_STAT_READ_FAILED
= 10,
77 MIG_STAT_CONNECTION_CLOSED
= 11,
78 MIG_STAT_SELECT_FAILED
= 12,
79 MIG_STAT_SELECT_TIMEOUT
= 13,
80 MIG_STAT_SELECT_FD_NOT_SET
= 14,
82 MIG_STAT_SAVEVM_FAILED
= 15,
85 MIG_STAT_MIGRATION_CANCEL
= 20,
87 /* kvm error codes (on src) */
88 MIG_STAT_KVM_UPDATE_DIRTY_PAGES_LOG_FAILED
= 101,
89 MIG_STAT_KVM_SET_DIRTY_TRACKING_FAILED
= 102,
90 MIG_STAT_KVM_GET_PAGE_BITMAP
= 103,
93 MIG_STAT_DST_INVALID_PARAMS
= 200 + MIG_STAT_INVALID_PARAMS
,
94 MIG_STAT_DST_INVALID_ADDR
= 200 + MIG_STAT_INVALID_ADDR
,
95 MIG_STAT_DST_SOCKET_FAILED
= 200 + MIG_STAT_SOCKET_FAILED
,
96 MIG_STAT_DST_SOCKOPT_FAILED
= 200 + MIG_STAT_SOCKOPT_FAILED
,
97 MIG_STAT_DST_BIND_FAILED
= 200 + MIG_STAT_BIND_FAILED
,
98 MIG_STAT_DST_LISTEN_FAILED
= 200 + MIG_STAT_LISTEN_FAILED
,
99 MIG_STAT_DST_ACCEPT_FAILED
= 200 + MIG_STAT_ACCEPT_FAILED
,
100 MIG_STAT_DST_CONNECT_FAILED
= 200 + MIG_STAT_CONNECT_FAILED
,
101 MIG_STAT_DST_WRITE_FAILED
= 200 + MIG_STAT_WRITE_FAILED
,
102 MIG_STAT_DST_READ_FAILED
= 200 + MIG_STAT_READ_FAILED
,
104 MIG_STAT_DST_CONNECTION_CLOSED
= 200 + MIG_STAT_CONNECTION_CLOSED
,
105 MIG_STAT_DST_SELECT_FAILED
= 200 + MIG_STAT_SELECT_FAILED
,
106 MIG_STAT_DST_SELECT_TIMEOUT
= 200 + MIG_STAT_SELECT_TIMEOUT
,
107 MIG_STAT_DST_SELECT_FD_NOT_SET
= 200 + MIG_STAT_SELECT_FD_NOT_SET
,
109 MIG_STAT_DST_LOADVM_FAILED
= 200 + MIG_STAT_SAVEVM_FAILED
,
110 MIG_STAT_DST_NO_MEM
= 200 + MIG_STAT_NO_MEM
,
112 MIG_STAT_DST_GET_PAGE_FAILED
= 230,
113 MIG_STAT_DST_GET_PAGE_UNKNOWN_TYPE
= 231,
114 MIG_STAT_DST_MEM_SIZE_MISMATCH
= 232,
115 MIG_STAT_DST_MEM_OUT_OF_RANGE
= 233,
118 //#define MIGRATION_VERIFY
119 #ifdef MIGRATION_VERIFY
120 static int save_verify_memory(QEMUFile
*f
, void *opaque
);
121 static int load_verify_memory(QEMUFile
*f
, void *opaque
, int version_id
);
122 #endif /* MIGRATION_VERIFY */
124 /* QEMUFile migration implementation */
126 static void migrate_put_buffer(void *opaque
, const uint8_t *buf
, int64_t pos
, int size
)
128 MigrationState
*s
= opaque
;
134 while (offset
< size
) {
137 len
= write(s
->fd
, buf
+ offset
, size
- offset
);
139 if (errno
== EAGAIN
|| errno
== EINTR
)
141 term_printf("migration: write failed (%s)\n", strerror(errno
));
142 *s
->has_error
= MIG_STAT_WRITE_FAILED
;
144 } else if (len
== 0) {
145 term_printf("migration: other side closed connection\n");
146 *s
->has_error
= MIG_STAT_CONNECTION_CLOSED
;
154 static void migrate_close(void *opaque
)
156 MigrationState
*s
= opaque
;
159 s
->release(s
->opaque
);
162 current_migration
= NULL
;
165 /* Outgoing migration routines */
166 static void migrate_finish(MigrationState
*s
)
170 int *has_error
= s
->has_error
;
171 int saved_vm_running
= vm_running
;
172 int detach
= s
->detach
;
174 fcntl(s
->fd
, F_SETFL
, 0);
178 f
= qemu_fopen(s
, migrate_put_buffer
, NULL
, migrate_close
);
181 } while (qemu_bh_poll());
184 if (kvm_allowed
&& !*s
->has_error
&& kvm_update_dirty_pages_log())
185 *s
->has_error
= MIG_STAT_KVM_UPDATE_DIRTY_PAGES_LOG_FAILED
;
188 ret
= qemu_live_savevm_state(f
);
189 #ifdef MIGRATION_VERIFY
190 save_verify_memory(f
, NULL
);
191 #endif /* MIGRATION_VERIFY */
198 status
= MIG_STAT_SAVEVM_FAILED
;
200 term_printf("Migration failed! ret=%d error=%d\n", ret
, *has_error
);
201 if (saved_vm_running
)
206 qemu_free(has_error
);
207 cpu_physical_memory_set_dirty_tracking(0);
210 static int migrate_write_buffer(MigrationState
*s
)
215 if (s
->n_buffer
< s
->l_buffer
) {
218 len
= write(s
->fd
, s
->buffer
+ s
->n_buffer
, s
->l_buffer
- s
->n_buffer
);
224 *s
->has_error
= MIG_STAT_WRITE_FAILED
;
228 *s
->has_error
= MIG_STAT_CONNECTION_CLOSED
;
232 s
->throttle_count
+= len
;
234 if (s
->n_buffer
< s
->l_buffer
)
238 if (s
->throttle_count
> max_throttle
) {
240 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, NULL
, NULL
);
247 static int migrate_check_convergence(MigrationState
*s
)
252 if ((s
->iteration
>= MAX_ITERATIONS
) ||
253 (s
->rapid_writes
>= MAX_RAPID_WRITES
) ) {
257 for (addr
= 0; addr
< phys_ram_size
; addr
+= TARGET_PAGE_SIZE
) {
259 if (kvm_allowed
&& (addr
>=0xa0000) && (addr
<0xc0000)) /* do not access video-addresses */
262 if (cpu_physical_memory_get_dirty(addr
, MIGRATION_DIRTY_FLAG
))
266 return ((dirty_count
* TARGET_PAGE_SIZE
) < MIN_FINALIZE_SIZE
);
269 static int ram_page_is_homogeneous(uint32_t addr
)
274 n
= TARGET_PAGE_SIZE
/ sizeof(v
);
275 p
= (uint32
*)(phys_ram_base
+ addr
);
284 static void migrate_prepare_page(MigrationState
*s
)
291 value
= cpu_to_be32(s
->addr
);
292 memcpy(s
->buffer
, &value
, 4);
294 if (ram_page_is_homogeneous(s
->addr
)) {
295 type
= 1; /* keeping ram_get_page() values */
300 bufflen
= TARGET_PAGE_SIZE
;
303 buff
= phys_ram_base
+ s
->addr
;
305 memcpy(s
->buffer
+ 4 + 1, phys_ram_base
+ s
->addr
, bufflen
);
307 s
->l_buffer
= 4 + 1 + bufflen
;
310 static void migrate_write(void *opaque
)
312 MigrationState
*s
= opaque
;
314 if (migrate_write_buffer(s
))
318 if (kvm_allowed
&& !*s
->has_error
&& kvm_update_dirty_pages_log())
319 *s
->has_error
= MIG_STAT_KVM_UPDATE_DIRTY_PAGES_LOG_FAILED
;
322 if (migrate_check_convergence(s
) || *s
->has_error
) {
323 qemu_del_timer(s
->timer
);
324 qemu_free_timer(s
->timer
);
325 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, NULL
, NULL
);
330 while (s
->addr
< phys_ram_size
) {
332 if (kvm_allowed
&& (s
->addr
>=0xa0000) && (s
->addr
<0xc0000)) /* do not access video-addresses */
336 if (cpu_physical_memory_get_dirty(s
->addr
, MIGRATION_DIRTY_FLAG
)) {
337 migrate_prepare_page(s
);
338 cpu_physical_memory_reset_dirty(s
->addr
, s
->addr
+ TARGET_PAGE_SIZE
, MIGRATION_DIRTY_FLAG
);
340 s
->addr
+= TARGET_PAGE_SIZE
;
344 if (migrate_write_buffer(s
))
347 s
->addr
+= TARGET_PAGE_SIZE
;
350 if ((s
->iteration
) && (s
->last_updated_pages
<= s
->updated_pages
)) {
351 s
->rapid_writes
++; /* "dirt-speed" is faster than transfer speed */
352 if (max_throttle
< (1 << 30))
353 max_throttle
*= 2; /* try harder */
355 s
->last_updated_pages
= s
->updated_pages
;
356 s
->updated_pages
= 0;
361 static void migrate_reset_throttle(void *opaque
)
363 MigrationState
*s
= opaque
;
365 s
->bps
= s
->throttle_count
;
369 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, migrate_write
, s
);
371 s
->throttle_count
= 0;
372 qemu_mod_timer(s
->timer
, qemu_get_clock(rt_clock
) + 1000);
375 static int write_whole_buffer(int fd
, const void *buff
, size_t size
)
377 size_t offset
= 0, len
;
379 while (offset
< size
) {
380 len
= write(fd
, buff
+ offset
, size
- offset
);
381 if (len
== -1 && errno
== EINTR
)
388 return !(offset
== size
); /* returns 0 on success */
391 static int bit_is_set(int bit
, unsigned char *map
)
393 return map
[bit
/8] & (1 << (bit
%8));
396 static int start_migration(MigrationState
*s
)
398 uint32_t value
= cpu_to_be32(phys_ram_size
);
399 target_phys_addr_t addr
;
401 unsigned char running
= vm_running
?2:1; /* 1 + vm_running */
405 unsigned char *phys_ram_page_exist_bitmap
= NULL
;
407 n
= BITMAP_SIZE(phys_ram_size
);
408 phys_ram_page_exist_bitmap
= qemu_malloc(n
);
409 if (!phys_ram_page_exist_bitmap
) {
410 perror("failed to allocate page bitmap");
414 if (kvm_get_phys_ram_page_bitmap(phys_ram_page_exist_bitmap
)) {
415 r
= MIG_STAT_KVM_GET_PAGE_BITMAP
;
416 perror("kvm_get_mem_map failed");
422 r
= MIG_STAT_WRITE_FAILED
;
423 if (write_whole_buffer(s
->fd
, &running
, sizeof(running
)))
425 if (write_whole_buffer(s
->fd
, &value
, sizeof(value
)))
430 value
= cpu_to_be32(n
);
431 if (write_whole_buffer(s
->fd
, &value
, sizeof(value
)))
433 if (write_whole_buffer(s
->fd
, phys_ram_page_exist_bitmap
, n
))
437 fcntl(s
->fd
, F_SETFL
, O_NONBLOCK
);
439 for (addr
= 0; addr
< phys_ram_size
; addr
+= TARGET_PAGE_SIZE
) {
441 if (kvm_allowed
&& !bit_is_set(addr
>>TARGET_PAGE_BITS
, phys_ram_page_exist_bitmap
)) {
442 cpu_physical_memory_reset_dirty(addr
,
443 addr
+ TARGET_PAGE_SIZE
,
444 MIGRATION_DIRTY_FLAG
);
448 if (!cpu_physical_memory_get_dirty(addr
, MIGRATION_DIRTY_FLAG
))
449 cpu_physical_memory_set_dirty(addr
);
452 if (cpu_physical_memory_set_dirty_tracking(1)) {
453 *s
->has_error
= MIG_STAT_KVM_SET_DIRTY_TRACKING_FAILED
;
459 s
->updated_pages
= 0;
460 s
->last_updated_pages
= 0;
461 s
->n_buffer
= s
->l_buffer
= 0;
463 s
->timer
= qemu_new_timer(rt_clock
, migrate_reset_throttle
, s
);
465 qemu_mod_timer(s
->timer
, qemu_get_clock(rt_clock
));
466 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, migrate_write
, s
);
470 if (phys_ram_page_exist_bitmap
)
471 qemu_free(phys_ram_page_exist_bitmap
);
476 static MigrationState
*migration_init_fd(int detach
, int fd
)
480 s
= qemu_mallocz(sizeof(MigrationState
));
482 term_printf("Allocation error\n");
487 s
->has_error
= qemu_mallocz(sizeof(int));
488 if (s
->has_error
== NULL
) {
489 term_printf("malloc failed (for has_error)\n");
494 current_migration
= s
;
496 if (start_migration(s
) == -1) {
497 term_printf("Could not start migration\n");
507 typedef struct MigrationCmdState
513 static int cmd_release(void *opaque
)
515 MigrationCmdState
*c
= opaque
;
521 ret
= waitpid(c
->pid
, &status
, 0);
522 if (ret
== -1 && errno
== EINTR
)
526 term_printf("migration: waitpid failed (%s)\n", strerror(errno
));
529 /* FIXME: check and uncomment
530 * if (WIFEXITED(status))
531 * status = WEXITSTATUS(status);
536 static MigrationState
*migration_init_cmd(int detach
, const char *command
, char **argv
)
543 if (pipe(fds
) == -1) {
544 term_printf("pipe() (%s)\n", strerror(errno
));
552 term_printf("fork error (%s)\n", strerror(errno
));
557 dup2(fds
[0], STDIN_FILENO
);
558 execvp(command
, argv
);
563 for (i
= 0; argv
[i
]; i
++)
567 s
= migration_init_fd(detach
, fds
[1]);
569 MigrationCmdState
*c
= qemu_mallocz(sizeof(*c
));
572 s
->release
= cmd_release
;
579 static MigrationState
*migration_init_exec(int detach
, const char *command
)
583 argv
= qemu_mallocz(sizeof(char *) * 4);
584 argv
[0] = strdup("sh");
585 argv
[1] = strdup("-c");
586 argv
[2] = strdup(command
);
589 return migration_init_cmd(detach
, "/bin/sh", argv
);
592 static MigrationState
*migration_init_ssh(int detach
, const char *host
)
594 int qemu_argc
, daemonize
= 0, argc
, i
;
595 char **qemu_argv
, **argv
;
596 const char *incoming
= NULL
;
598 qemu_get_launch_info(&qemu_argc
, &qemu_argv
, &daemonize
, &incoming
);
600 argc
= 3 + qemu_argc
;
606 argv
= qemu_mallocz(sizeof(char *) * (argc
+ 1));
607 argv
[0] = strdup("ssh");
608 argv
[1] = strdup("-XC");
609 argv
[2] = strdup(host
);
611 for (i
= 0; i
< qemu_argc
; i
++)
612 argv
[3 + i
] = strdup(qemu_argv
[i
]);
615 argv
[3 + i
++] = strdup("-daemonize");
617 argv
[3 + i
++] = strdup("-incoming");
618 argv
[3 + i
++] = strdup("stdio");
623 return migration_init_cmd(detach
, "ssh", argv
);
626 /* (busy) wait timeout (miliseconds) for a message to arrive on fd. */
627 /* returns 0 on success error_code otherwise (18 for timeout) */
628 static int wait_for_message(const char *msg
, int fd
, int timeout
)
632 int64_t now
, expiration
, delta
; /* milliseconds */
635 now
= qemu_get_clock(rt_clock
);
636 expiration
= now
+ timeout
;
640 tv
.tv_sec
= tv
.tv_usec
= 0;
641 now
= qemu_get_clock(rt_clock
);
642 delta
= expiration
- now
;
644 tv
.tv_usec
= delta
* 1000;
645 n
= select(fd
+ 1, &rfds
, NULL
, NULL
, &tv
);
646 } while ( (n
== -1) && (errno
== EINTR
) );
650 fprintf(stderr
, "%s FAILED: ", msg
);
652 return MIG_STAT_SELECT_FAILED
;
653 case 0: /* timeout */
654 fprintf(stderr
, "%s: timeout reached\n", msg
);
655 return MIG_STAT_SELECT_TIMEOUT
;
659 fprintf(stderr
, "wait_for_message: %s: select returned %d\n", msg
, n
);
661 if (!FD_ISSET(fd
, &rfds
)) {
662 fprintf(stderr
, "wait_for_message: %s: s->fd not set\n", msg
);
663 return MIG_STAT_SELECT_FD_NOT_SET
;
669 static int tcp_release(void *opaque
)
671 MigrationState
*s
= opaque
;
679 n
= wait_for_message("WAIT FOR ACK", s
->fd
, wait_for_message_timeout
);
686 len
= read(s
->fd
, &status
, 1);
687 if (len
== -1 && errno
== EINTR
)
689 if (len
!= 1 || status
!= 0) {
690 *s
->has_error
= MIG_STAT_READ_FAILED
;
691 fprintf(stderr
, "migration: wait_for_ack: read error l=%zu s=%d(%s)\n",
692 len
, status
, strerror(errno
));
697 len
= write(s
->fd
, &status
, 1);
698 if (len
== -1 && errno
== EINTR
)
701 fprintf(stderr
, "migration: send_go: write error l=%zu (%s)\n",
702 len
, strerror(errno
));
703 *s
->has_error
= MIG_STAT_WRITE_FAILED
;
709 return (len
!= 1 || status
!= 0);
712 static MigrationState
*migration_init_tcp(int detach
, const char *host
)
715 struct sockaddr_in addr
;
718 fd
= socket(PF_INET
, SOCK_STREAM
, 0);
720 term_printf("socket() failed %s\n", strerror(errno
));
721 status
= MIG_STAT_SOCKET_FAILED
;
725 addr
.sin_family
= AF_INET
;
726 if (parse_host_port(&addr
, host
) == -1) {
727 term_printf("parse_host_port() FAILED for %s\n", host
);
729 status
= MIG_STAT_INVALID_ADDR
;
734 if (connect(fd
, (struct sockaddr
*)&addr
, sizeof(addr
)) == -1) {
737 term_printf("connect() failed %s\n", strerror(errno
));
739 status
= MIG_STAT_CONNECT_FAILED
;
743 s
= migration_init_fd(detach
, fd
);
746 s
->release
= tcp_release
;
751 /* Incoming migration */
753 static void migrate_incoming_homogeneous_page(uint32_t addr
, uint32_t v
)
758 n
= TARGET_PAGE_SIZE
/ sizeof(v
);
759 p
= (uint32
*)(phys_ram_base
+ addr
);
765 static int migrate_incoming_page(QEMUFile
*f
, uint32_t addr
)
769 switch (qemu_get_byte(f
)) {
770 case 0: /* the whole page */
771 l
= qemu_get_buffer(f
, phys_ram_base
+ addr
, TARGET_PAGE_SIZE
);
772 if (l
!= TARGET_PAGE_SIZE
)
773 ret
= MIG_STAT_DST_GET_PAGE_FAILED
;
775 case 1: /* homogeneous page -- a single byte */
776 l
= qemu_get_buffer(f
, (void*)&v
, 4);
778 ret
= MIG_STAT_DST_GET_PAGE_FAILED
;
779 migrate_incoming_homogeneous_page(addr
, v
);
782 ret
= MIG_STAT_DST_GET_PAGE_UNKNOWN_TYPE
;
788 static int migrate_incoming_fd(int fd
)
791 QEMUFile
*f
= qemu_fopen_fd(fd
);
793 extern void qemu_announce_self(void);
794 unsigned char running
;
796 running
= qemu_get_byte(f
);
797 if ((running
!= 1) && (running
!= 2)) {
798 fprintf(stderr
, "migration: illegal running value %u, not (1 or 2)\n",
800 return MIG_STAT_DST_MEM_SIZE_MISMATCH
;
802 autostart
= running
- 1;
804 size
= qemu_get_be32(f
);
805 if (size
!= phys_ram_size
) {
806 fprintf(stderr
, "migration: memory size mismatch: recv %u mine %u\n",
807 size
, phys_ram_size
);
808 return MIG_STAT_DST_MEM_SIZE_MISMATCH
;
814 unsigned char *phys_ram_page_exist_bitmap
= NULL
;
816 /* allocate memory bitmap */
817 n
= BITMAP_SIZE(phys_ram_size
);
818 m
= qemu_get_be32(f
);
819 if (m
> n
) // allocate enough space
821 phys_ram_page_exist_bitmap
= qemu_malloc(n
);
822 if (!phys_ram_page_exist_bitmap
) {
823 perror("failed to allocate page bitmap");
824 return MIG_STAT_NO_MEM
;
827 /* receive memory bitmap */
828 qemu_get_buffer(f
, phys_ram_page_exist_bitmap
, m
);
830 /* FIXME: free dellocated-at-src guest memory pages */
832 qemu_free(phys_ram_page_exist_bitmap
);
837 addr
= qemu_get_be32(f
);
840 if (addr
>= phys_ram_size
)
841 return MIG_STAT_DST_MEM_OUT_OF_RANGE
;
842 ret
= migrate_incoming_page(f
, addr
);
850 if (qemu_live_loadvm_state(f
))
851 ret
= MIG_STAT_DST_LOADVM_FAILED
;
852 #ifdef MIGRATION_VERIFY
853 if (ret
==0) ret
=load_verify_memory(f
, NULL
, 1);
854 #endif /* MIGRATION_VERIFY */
860 static int migrate_incoming_tcp(const char *host
)
862 struct sockaddr_in addr
;
863 socklen_t addrlen
= sizeof(addr
);
870 addr
.sin_family
= AF_INET
;
871 if (parse_host_port(&addr
, host
) == -1) {
872 fprintf(stderr
, "parse_host_port() failed for %s\n", host
);
873 rc
= MIG_STAT_DST_INVALID_ADDR
;
877 fd
= socket(PF_INET
, SOCK_STREAM
, 0);
879 perror("socket failed");
880 rc
= MIG_STAT_DST_SOCKET_FAILED
;
884 if (setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, &reuse
, sizeof(reuse
)) == -1) {
885 perror("setsockopt() failed");
886 rc
= MIG_STAT_DST_SOCKOPT_FAILED
;
890 if (bind(fd
, (struct sockaddr
*)&addr
, sizeof(addr
)) == -1) {
891 perror("bind() failed");
892 rc
= MIG_STAT_DST_BIND_FAILED
;
896 if (listen(fd
, 1) == -1) {
897 perror("listen() failed");
898 rc
= MIG_STAT_DST_LISTEN_FAILED
;
903 sfd
= accept(fd
, (struct sockaddr
*)&addr
, &addrlen
);
907 perror("accept() failed");
908 rc
= MIG_STAT_DST_ACCEPT_FAILED
;
912 rc
= migrate_incoming_fd(sfd
);
914 fprintf(stderr
, "migrate_incoming_fd failed (rc=%d)\n", rc
);
919 len
= write(sfd
, &status
, 1);
920 if (len
== -1 && errno
== EAGAIN
)
923 fprintf(stderr
, "migration: send_ack: write error len=%zu (%s)\n",
924 len
, strerror(errno
));
925 rc
= MIG_STAT_DST_WRITE_FAILED
;
929 rc
= wait_for_message("WAIT FOR GO", sfd
, wait_for_message_timeout
);
936 len
= read(sfd
, &status
, 1);
937 if (len
== -1 && errno
== EAGAIN
)
940 rc
= MIG_STAT_DST_READ_FAILED
;
941 fprintf(stderr
, "migration: wait_for_go: read error len=%zu (%s)\n",
942 len
, strerror(errno
));
953 int migrate_incoming(const char *device
)
958 if (strcmp(device
, "stdio") == 0)
959 ret
= migrate_incoming_fd(STDIN_FILENO
);
960 else if (strstart(device
, "file://", &ptr
)) {
961 int fd
= open(ptr
, O_RDONLY
);
963 ret
= MIG_STAT_DST_INVALID_PARAMS
;
965 ret
= migrate_incoming_fd(fd
);
968 } else if (strstart(device
, "tcp://", &ptr
)) {
971 end
= strchr(host
, '/');
973 ret
= migrate_incoming_tcp(host
);
977 ret
= MIG_STAT_DST_INVALID_PARAMS
;
983 /* Migration monitor command */
986 1) audit all error paths
989 void do_migrate(int detach
, const char *uri
)
992 MigrationState
*s
= current_migration
;
995 term_printf("Migration already active\n");
999 status
= MIG_STAT_INVALID_PARAMS
;
1000 if (strstart(uri
, "exec:", &ptr
)) {
1001 char *command
= urldecode(ptr
);
1002 migration_init_exec(detach
, command
);
1004 } else if (strstart(uri
, "ssh://", &ptr
)) {
1008 end
= strchr(host
, '/');
1010 migration_init_ssh(detach
, host
);
1012 } else if (strstart(uri
, "tcp://", &ptr
)) {
1016 end
= strchr(host
, '/');
1019 if (migration_init_tcp(detach
, host
) == NULL
)
1020 term_printf("migration failed (migration_init_tcp for %s failed)\n", host
);
1023 term_printf("Unknown migration protocol '%s'\n", uri
);
1028 void do_migrate_set_speed(const char *value
)
1033 d
= strtod(value
, &ptr
);
1045 max_throttle
= (uint32_t)d
;
1048 void do_info_migration(void)
1050 MigrationState
*s
= current_migration
;
1053 term_printf("Migration active\n");
1054 if (s
->bps
< (1 << 20))
1055 term_printf("Transfer rate %3.1f kb/s\n",
1056 (double)s
->bps
/ 1024);
1058 term_printf("Transfer rate %3.1f mb/s\n",
1059 (double)s
->bps
/ (1024 * 1024));
1060 term_printf("Iteration %d\n", s
->iteration
);
1061 term_printf("Transferred %d/%d pages\n", s
->updated_pages
, phys_ram_size
>> TARGET_PAGE_BITS
);
1063 term_printf("Last iteration found %d dirty pages\n", s
->last_updated_pages
);
1065 term_printf("Migration inactive\n");
1066 term_printf("last migration status is %d\n", status
);
1068 term_printf("Maximum migration speed is ");
1069 if (max_throttle
< (1 << 20))
1070 term_printf("%3.1f kb/s\n", (double)max_throttle
/ 1024);
1072 term_printf("%3.1f mb/s\n", (double)max_throttle
/ (1024 * 1024));
1075 void do_migrate_cancel(void)
1077 MigrationState
*s
= current_migration
;
1080 *s
->has_error
= MIG_STAT_MIGRATION_CANCEL
;
1085 #ifdef MIGRATION_VERIFY
1086 unsigned int calc_page_checksum(target_ulong addr
)
1089 unsigned int *p
= (unsigned int *)(phys_ram_base
+ addr
);
1090 unsigned int *q
= p
+ (TARGET_PAGE_SIZE
/ sizeof(unsigned int));
1092 for ( /*initialized already */ ; p
<q
; p
++)
1098 static int save_verify_memory(QEMUFile
*f
, void *opaque
)
1103 for (addr
= 0; addr
< phys_ram_size
; addr
+= TARGET_PAGE_SIZE
) {
1105 if (kvm_allowed
&& (addr
>=0xa0000) && (addr
<0xc0000)) /* do not access video-addresses */
1108 sum
= calc_page_checksum(addr
);
1109 qemu_put_be32(f
, addr
);
1110 qemu_put_be32(f
, sum
);
1115 static int load_verify_memory(QEMUFile
*f
, void *opaque
, int version_id
)
1117 unsigned int addr
, raddr
;
1118 unsigned int sum
, rsum
;
1121 for (addr
= 0; addr
< phys_ram_size
; addr
+= TARGET_PAGE_SIZE
) {
1123 if (kvm_allowed
&& (addr
>=0xa0000) && (addr
<0xc0000)) /* do not access video-addresses */
1126 sum
= calc_page_checksum(addr
);
1127 raddr
= qemu_get_be32(f
);
1128 rsum
= qemu_get_be32(f
);
1129 if ((raddr
!= addr
) || (rsum
!= sum
)) {
1130 term_printf("checksum mismatch: src:0x%x 0x%x , dst:0x%x 0x%x\n",
1131 raddr
, rsum
, addr
, sum
);
1135 printf("memory_verify: num_errors=%d\n", num_errors
);
1136 term_printf("memory_verify: num_errors=%d\n", num_errors
);
1137 return 0/* num_errors */;
1139 #endif /* MIGRATION_VERIFY */