]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * QEMU live migration | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "qemu-common.h" | |
15 | #include "qemu_socket.h" | |
16 | #include "migration.h" | |
17 | #include "qemu-char.h" | |
18 | #include "buffered_file.h" | |
19 | #include "block.h" | |
20 | ||
21 | //#define DEBUG_MIGRATION_TCP | |
22 | ||
23 | #ifdef DEBUG_MIGRATION_TCP | |
24 | #define DPRINTF(fmt, ...) \ | |
25 | do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) | |
26 | #else | |
27 | #define DPRINTF(fmt, ...) \ | |
28 | do { } while (0) | |
29 | #endif | |
30 | ||
31 | static int socket_errno(FdMigrationState *s) | |
32 | { | |
33 | return socket_error(); | |
34 | } | |
35 | ||
36 | static int socket_write(FdMigrationState *s, const void * buf, size_t size) | |
37 | { | |
38 | return send(s->fd, buf, size, 0); | |
39 | } | |
40 | ||
41 | static int tcp_close(FdMigrationState *s) | |
42 | { | |
43 | DPRINTF("tcp_close\n"); | |
44 | if (s->fd != -1) { | |
45 | close(s->fd); | |
46 | s->fd = -1; | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
51 | ||
52 | static void tcp_wait_for_connect(void *opaque) | |
53 | { | |
54 | FdMigrationState *s = opaque; | |
55 | int val, ret; | |
56 | socklen_t valsize = sizeof(val); | |
57 | ||
58 | DPRINTF("connect completed\n"); | |
59 | do { | |
60 | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); | |
61 | } while (ret == -1 && (s->get_error(s)) == EINTR); | |
62 | ||
63 | if (ret < 0) { | |
64 | migrate_fd_error(s); | |
65 | return; | |
66 | } | |
67 | ||
68 | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); | |
69 | ||
70 | if (val == 0) | |
71 | migrate_fd_connect(s); | |
72 | else { | |
73 | DPRINTF("error connecting %d\n", val); | |
74 | migrate_fd_error(s); | |
75 | } | |
76 | } | |
77 | ||
78 | MigrationState *tcp_start_outgoing_migration(Monitor *mon, | |
79 | const char *host_port, | |
80 | int64_t bandwidth_limit, | |
81 | int detach, | |
82 | int blk, | |
83 | int inc) | |
84 | { | |
85 | struct sockaddr_in addr; | |
86 | FdMigrationState *s; | |
87 | int ret; | |
88 | ||
89 | if (parse_host_port(&addr, host_port) < 0) | |
90 | return NULL; | |
91 | ||
92 | s = qemu_mallocz(sizeof(*s)); | |
93 | ||
94 | s->get_error = socket_errno; | |
95 | s->write = socket_write; | |
96 | s->close = tcp_close; | |
97 | s->mig_state.cancel = migrate_fd_cancel; | |
98 | s->mig_state.get_status = migrate_fd_get_status; | |
99 | s->mig_state.release = migrate_fd_release; | |
100 | ||
101 | s->mig_state.blk = blk; | |
102 | s->mig_state.shared = inc; | |
103 | ||
104 | s->state = MIG_STATE_ACTIVE; | |
105 | s->mon = NULL; | |
106 | s->bandwidth_limit = bandwidth_limit; | |
107 | s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0); | |
108 | if (s->fd == -1) { | |
109 | qemu_free(s); | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | socket_set_nonblock(s->fd); | |
114 | ||
115 | if (!detach) { | |
116 | migrate_fd_monitor_suspend(s, mon); | |
117 | } | |
118 | ||
119 | do { | |
120 | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); | |
121 | if (ret == -1) | |
122 | ret = -(s->get_error(s)); | |
123 | ||
124 | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) | |
125 | qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); | |
126 | } while (ret == -EINTR); | |
127 | ||
128 | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { | |
129 | DPRINTF("connect failed\n"); | |
130 | migrate_fd_error(s); | |
131 | } else if (ret >= 0) | |
132 | migrate_fd_connect(s); | |
133 | ||
134 | return &s->mig_state; | |
135 | } | |
136 | ||
137 | static void tcp_accept_incoming_migration(void *opaque) | |
138 | { | |
139 | struct sockaddr_in addr; | |
140 | socklen_t addrlen = sizeof(addr); | |
141 | int s = (intptr_t)opaque; | |
142 | QEMUFile *f; | |
143 | int c; | |
144 | ||
145 | do { | |
146 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); | |
147 | } while (c == -1 && socket_error() == EINTR); | |
148 | ||
149 | DPRINTF("accepted migration\n"); | |
150 | ||
151 | if (c == -1) { | |
152 | fprintf(stderr, "could not accept migration connection\n"); | |
153 | goto out2; | |
154 | } | |
155 | ||
156 | f = qemu_fopen_socket(c); | |
157 | if (f == NULL) { | |
158 | fprintf(stderr, "could not qemu_fopen socket\n"); | |
159 | goto out; | |
160 | } | |
161 | ||
162 | process_incoming_migration(f); | |
163 | qemu_fclose(f); | |
164 | out: | |
165 | close(c); | |
166 | out2: | |
167 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); | |
168 | close(s); | |
169 | } | |
170 | ||
171 | int tcp_start_incoming_migration(const char *host_port) | |
172 | { | |
173 | struct sockaddr_in addr; | |
174 | int val; | |
175 | int s; | |
176 | ||
177 | if (parse_host_port(&addr, host_port) < 0) { | |
178 | fprintf(stderr, "invalid host/port combination: %s\n", host_port); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | s = qemu_socket(PF_INET, SOCK_STREAM, 0); | |
183 | if (s == -1) | |
184 | return -socket_error(); | |
185 | ||
186 | val = 1; | |
187 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); | |
188 | ||
189 | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) | |
190 | goto err; | |
191 | ||
192 | if (listen(s, 1) == -1) | |
193 | goto err; | |
194 | ||
195 | qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, | |
196 | (void *)(intptr_t)s); | |
197 | ||
198 | return 0; | |
199 | ||
200 | err: | |
201 | close(s); | |
202 | return -socket_error(); | |
203 | } |