4 * Copyright IBM, Corp. 2008
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "qemu-common.h"
15 #include "qemu_socket.h"
16 #include "migration.h"
17 #include "qemu-char.h"
19 #include "buffered_file.h"
22 //#define DEBUG_MIGRATION_TCP
24 #ifdef DEBUG_MIGRATION_TCP
25 #define dprintf(fmt, ...) \
26 do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
28 #define dprintf(fmt, ...) \
32 static int socket_errno(FdMigrationState
*s
)
34 return socket_error();
37 static int socket_write(FdMigrationState
*s
, const void * buf
, size_t size
)
39 return send(s
->fd
, buf
, size
, 0);
42 static int tcp_close(FdMigrationState
*s
)
44 dprintf("tcp_close\n");
53 static void tcp_wait_for_connect(void *opaque
)
55 FdMigrationState
*s
= opaque
;
57 socklen_t valsize
= sizeof(val
);
59 dprintf("connect completed\n");
61 ret
= getsockopt(s
->fd
, SOL_SOCKET
, SO_ERROR
, (void *) &val
, &valsize
);
62 } while (ret
== -1 && (s
->get_error(s
)) == EINTR
);
69 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, NULL
, NULL
);
72 migrate_fd_connect(s
);
74 dprintf("error connecting %d\n", val
);
79 MigrationState
*tcp_start_outgoing_migration(const char *host_port
,
80 int64_t bandwidth_limit
,
83 struct sockaddr_in addr
;
87 if (parse_host_port(&addr
, host_port
) < 0)
90 s
= qemu_mallocz(sizeof(*s
));
92 s
->get_error
= socket_errno
;
93 s
->write
= socket_write
;
95 s
->mig_state
.cancel
= migrate_fd_cancel
;
96 s
->mig_state
.get_status
= migrate_fd_get_status
;
97 s
->mig_state
.release
= migrate_fd_release
;
99 s
->state
= MIG_STATE_ACTIVE
;
100 s
->mon_resume
= NULL
;
101 s
->bandwidth_limit
= bandwidth_limit
;
102 s
->fd
= socket(PF_INET
, SOCK_STREAM
, 0);
108 socket_set_nonblock(s
->fd
);
111 migrate_fd_monitor_suspend(s
);
114 ret
= connect(s
->fd
, (struct sockaddr
*)&addr
, sizeof(addr
));
116 ret
= -(s
->get_error(s
));
118 if (ret
== -EINPROGRESS
|| ret
== -EWOULDBLOCK
)
119 qemu_set_fd_handler2(s
->fd
, NULL
, NULL
, tcp_wait_for_connect
, s
);
120 } while (ret
== -EINTR
);
122 if (ret
< 0 && ret
!= -EINPROGRESS
&& ret
!= -EWOULDBLOCK
) {
123 dprintf("connect failed\n");
128 migrate_fd_connect(s
);
130 return &s
->mig_state
;
133 static void tcp_accept_incoming_migration(void *opaque
)
135 struct sockaddr_in addr
;
136 socklen_t addrlen
= sizeof(addr
);
137 int s
= (unsigned long)opaque
;
142 c
= accept(s
, (struct sockaddr
*)&addr
, &addrlen
);
143 } while (c
== -1 && socket_error() == EINTR
);
145 dprintf("accepted migration\n");
148 fprintf(stderr
, "could not accept migration connection\n");
152 f
= qemu_fopen_socket(c
);
154 fprintf(stderr
, "could not qemu_fopen socket\n");
158 vm_stop(0); /* just in case */
159 ret
= qemu_loadvm_state(f
);
161 fprintf(stderr
, "load of migration failed\n");
164 qemu_announce_self();
165 dprintf("successfully loaded vm state\n");
167 /* we've successfully migrated, close the server socket */
168 qemu_set_fd_handler2(s
, NULL
, NULL
, NULL
, NULL
);
179 int tcp_start_incoming_migration(const char *host_port
)
181 struct sockaddr_in addr
;
185 if (parse_host_port(&addr
, host_port
) < 0) {
186 fprintf(stderr
, "invalid host/port combination: %s\n", host_port
);
190 s
= socket(PF_INET
, SOCK_STREAM
, 0);
192 return -socket_error();
195 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&val
, sizeof(val
));
197 if (bind(s
, (struct sockaddr
*)&addr
, sizeof(addr
)) == -1)
200 if (listen(s
, 1) == -1)
203 qemu_set_fd_handler2(s
, NULL
, tcp_accept_incoming_migration
, NULL
,
204 (void *)(unsigned long)s
);
210 return -socket_error();