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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 "sysemu.h" | |
19 | #include "buffered_file.h" | |
20 | #include "block.h" | |
21 | ||
22 | //#define DEBUG_MIGRATION_TCP | |
23 | ||
24 | #ifdef DEBUG_MIGRATION_TCP | |
25 | #define dprintf(fmt, ...) \ | |
26 | do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) | |
27 | #else | |
28 | #define dprintf(fmt, ...) \ | |
29 | do { } while (0) | |
30 | #endif | |
31 | ||
32 | static int socket_errno(FdMigrationState *s) | |
33 | { | |
34 | return socket_error(); | |
35 | } | |
36 | ||
37 | static int socket_write(FdMigrationState *s, const void * buf, size_t size) | |
38 | { | |
39 | return send(s->fd, buf, size, 0); | |
40 | } | |
41 | ||
42 | static int tcp_close(FdMigrationState *s) | |
43 | { | |
44 | dprintf("tcp_close\n"); | |
45 | if (s->fd != -1) { | |
46 | close(s->fd); | |
47 | s->fd = -1; | |
48 | } | |
49 | return 0; | |
50 | } | |
51 | ||
52 | ||
53 | static void tcp_wait_for_connect(void *opaque) | |
54 | { | |
55 | FdMigrationState *s = opaque; | |
56 | int val, ret; | |
57 | socklen_t valsize = sizeof(val); | |
58 | ||
59 | dprintf("connect completed\n"); | |
60 | do { | |
61 | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize); | |
62 | } while (ret == -1 && (s->get_error(s)) == EINTR); | |
63 | ||
64 | if (ret < 0) { | |
65 | migrate_fd_error(s); | |
66 | return; | |
67 | } | |
68 | ||
69 | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); | |
70 | ||
71 | if (val == 0) | |
72 | migrate_fd_connect(s); | |
73 | else { | |
74 | dprintf("error connecting %d\n", val); | |
75 | migrate_fd_error(s); | |
76 | } | |
77 | } | |
78 | ||
79 | MigrationState *tcp_start_outgoing_migration(Monitor *mon, | |
80 | const char *host_port, | |
81 | int64_t bandwidth_limit, | |
82 | int detach, | |
83 | int blk, | |
84 | int inc) | |
85 | { | |
86 | struct sockaddr_in addr; | |
87 | FdMigrationState *s; | |
88 | int ret; | |
89 | ||
90 | if (parse_host_port(&addr, host_port) < 0) | |
91 | return NULL; | |
92 | ||
93 | s = qemu_mallocz(sizeof(*s)); | |
94 | ||
95 | s->get_error = socket_errno; | |
96 | s->write = socket_write; | |
97 | s->close = tcp_close; | |
98 | s->mig_state.cancel = migrate_fd_cancel; | |
99 | s->mig_state.get_status = migrate_fd_get_status; | |
100 | s->mig_state.release = migrate_fd_release; | |
101 | ||
102 | s->mig_state.blk = blk; | |
103 | s->mig_state.shared = inc; | |
104 | ||
105 | s->state = MIG_STATE_ACTIVE; | |
106 | s->mon = NULL; | |
107 | s->bandwidth_limit = bandwidth_limit; | |
108 | s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0); | |
109 | if (s->fd == -1) { | |
110 | qemu_free(s); | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | socket_set_nonblock(s->fd); | |
115 | ||
116 | if (!detach) { | |
117 | migrate_fd_monitor_suspend(s, mon); | |
118 | } | |
119 | ||
120 | do { | |
121 | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); | |
122 | if (ret == -1) | |
123 | ret = -(s->get_error(s)); | |
124 | ||
125 | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) | |
126 | qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); | |
127 | } while (ret == -EINTR); | |
128 | ||
129 | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { | |
130 | dprintf("connect failed\n"); | |
131 | close(s->fd); | |
132 | qemu_free(s); | |
133 | return NULL; | |
134 | } else if (ret >= 0) | |
135 | migrate_fd_connect(s); | |
136 | ||
137 | return &s->mig_state; | |
138 | } | |
139 | ||
140 | static void tcp_accept_incoming_migration(void *opaque) | |
141 | { | |
142 | struct sockaddr_in addr; | |
143 | socklen_t addrlen = sizeof(addr); | |
144 | int s = (unsigned long)opaque; | |
145 | QEMUFile *f; | |
146 | int c, ret; | |
147 | ||
148 | do { | |
149 | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen); | |
150 | } while (c == -1 && socket_error() == EINTR); | |
151 | ||
152 | dprintf("accepted migration\n"); | |
153 | ||
154 | if (c == -1) { | |
155 | fprintf(stderr, "could not accept migration connection\n"); | |
156 | return; | |
157 | } | |
158 | ||
159 | f = qemu_fopen_socket(c); | |
160 | if (f == NULL) { | |
161 | fprintf(stderr, "could not qemu_fopen socket\n"); | |
162 | goto out; | |
163 | } | |
164 | ||
165 | ret = qemu_loadvm_state(f); | |
166 | if (ret < 0) { | |
167 | fprintf(stderr, "load of migration failed\n"); | |
168 | goto out_fopen; | |
169 | } | |
170 | qemu_announce_self(); | |
171 | dprintf("successfully loaded vm state\n"); | |
172 | ||
173 | /* we've successfully migrated, close the server socket */ | |
174 | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); | |
175 | close(s); | |
176 | if (autostart) | |
177 | vm_start(); | |
178 | ||
179 | out_fopen: | |
180 | qemu_fclose(f); | |
181 | out: | |
182 | close(c); | |
183 | } | |
184 | ||
185 | int tcp_start_incoming_migration(const char *host_port) | |
186 | { | |
187 | struct sockaddr_in addr; | |
188 | int val; | |
189 | int s; | |
190 | ||
191 | if (parse_host_port(&addr, host_port) < 0) { | |
192 | fprintf(stderr, "invalid host/port combination: %s\n", host_port); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | s = qemu_socket(PF_INET, SOCK_STREAM, 0); | |
197 | if (s == -1) | |
198 | return -socket_error(); | |
199 | ||
200 | val = 1; | |
201 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); | |
202 | ||
203 | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) | |
204 | goto err; | |
205 | ||
206 | if (listen(s, 1) == -1) | |
207 | goto err; | |
208 | ||
209 | qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, | |
210 | (void *)(unsigned long)s); | |
211 | ||
212 | return 0; | |
213 | ||
214 | err: | |
215 | close(s); | |
216 | return -socket_error(); | |
217 | } |