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1 | 34c9dd8e | aliguori | /*
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2 | 34c9dd8e | aliguori | * QEMU live migration
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3 | 34c9dd8e | aliguori | *
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4 | 34c9dd8e | aliguori | * Copyright IBM, Corp. 2008
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5 | 34c9dd8e | aliguori | *
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6 | 34c9dd8e | aliguori | * Authors:
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7 | 34c9dd8e | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 34c9dd8e | aliguori | *
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9 | 34c9dd8e | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 34c9dd8e | aliguori | * the COPYING file in the top-level directory.
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11 | 34c9dd8e | aliguori | *
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12 | 34c9dd8e | aliguori | */
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13 | 34c9dd8e | aliguori | |
14 | 34c9dd8e | aliguori | #include "qemu-common.h" |
15 | 34c9dd8e | aliguori | #include "qemu_socket.h" |
16 | 34c9dd8e | aliguori | #include "migration.h" |
17 | 34c9dd8e | aliguori | #include "qemu-char.h" |
18 | 34c9dd8e | aliguori | #include "sysemu.h" |
19 | 34c9dd8e | aliguori | #include "console.h" |
20 | 34c9dd8e | aliguori | #include "buffered_file.h" |
21 | 34c9dd8e | aliguori | #include "block.h" |
22 | 34c9dd8e | aliguori | |
23 | 34c9dd8e | aliguori | //#define DEBUG_MIGRATION_TCP
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24 | 34c9dd8e | aliguori | |
25 | 34c9dd8e | aliguori | #ifdef DEBUG_MIGRATION_TCP
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26 | 34c9dd8e | aliguori | #define dprintf(fmt, ...) \
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27 | 34c9dd8e | aliguori | do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) |
28 | 34c9dd8e | aliguori | #else
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29 | 34c9dd8e | aliguori | #define dprintf(fmt, ...) \
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30 | 34c9dd8e | aliguori | do { } while (0) |
31 | 34c9dd8e | aliguori | #endif
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32 | 34c9dd8e | aliguori | |
33 | 065e2813 | aliguori | static int socket_errno(FdMigrationState *s) |
34 | 34c9dd8e | aliguori | { |
35 | 8ad9fa5d | aliguori | return socket_error();
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36 | 34c9dd8e | aliguori | } |
37 | 34c9dd8e | aliguori | |
38 | 065e2813 | aliguori | static int socket_write(FdMigrationState *s, const void * buf, size_t size) |
39 | 34c9dd8e | aliguori | { |
40 | 065e2813 | aliguori | return send(s->fd, buf, size, 0); |
41 | 34c9dd8e | aliguori | } |
42 | 34c9dd8e | aliguori | |
43 | 065e2813 | aliguori | static int tcp_close(FdMigrationState *s) |
44 | 34c9dd8e | aliguori | { |
45 | 065e2813 | aliguori | dprintf("tcp_close\n");
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46 | 34c9dd8e | aliguori | if (s->fd != -1) { |
47 | ff8d81d8 | aliguori | close(s->fd); |
48 | ff8d81d8 | aliguori | s->fd = -1;
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49 | 34c9dd8e | aliguori | } |
50 | 34c9dd8e | aliguori | return 0; |
51 | 34c9dd8e | aliguori | } |
52 | 34c9dd8e | aliguori | |
53 | 34c9dd8e | aliguori | |
54 | 34c9dd8e | aliguori | static void tcp_wait_for_connect(void *opaque) |
55 | 34c9dd8e | aliguori | { |
56 | 34c9dd8e | aliguori | FdMigrationState *s = opaque; |
57 | 34c9dd8e | aliguori | int val, ret;
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58 | 4761a48b | blueswir1 | socklen_t valsize = sizeof(val);
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59 | 34c9dd8e | aliguori | |
60 | 34c9dd8e | aliguori | dprintf("connect completed\n");
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61 | 34c9dd8e | aliguori | do {
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62 | 34c9dd8e | aliguori | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize); |
63 | 065e2813 | aliguori | } while (ret == -1 && (s->get_error(s)) == EINTR); |
64 | 34c9dd8e | aliguori | |
65 | 34c9dd8e | aliguori | if (ret < 0) { |
66 | 065e2813 | aliguori | migrate_fd_error(s); |
67 | 34c9dd8e | aliguori | return;
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68 | 34c9dd8e | aliguori | } |
69 | 34c9dd8e | aliguori | |
70 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
71 | 34c9dd8e | aliguori | |
72 | 34c9dd8e | aliguori | if (val == 0) |
73 | 065e2813 | aliguori | migrate_fd_connect(s); |
74 | 34c9dd8e | aliguori | else {
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75 | 34c9dd8e | aliguori | dprintf("error connecting %d\n", val);
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76 | 065e2813 | aliguori | migrate_fd_error(s); |
77 | 34c9dd8e | aliguori | } |
78 | 34c9dd8e | aliguori | } |
79 | 34c9dd8e | aliguori | |
80 | 34c9dd8e | aliguori | MigrationState *tcp_start_outgoing_migration(const char *host_port, |
81 | ff8d81d8 | aliguori | int64_t bandwidth_limit, |
82 | ff8d81d8 | aliguori | int async)
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83 | 34c9dd8e | aliguori | { |
84 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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85 | 34c9dd8e | aliguori | FdMigrationState *s; |
86 | 34c9dd8e | aliguori | int ret;
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87 | 34c9dd8e | aliguori | |
88 | 34c9dd8e | aliguori | if (parse_host_port(&addr, host_port) < 0) |
89 | 34c9dd8e | aliguori | return NULL; |
90 | 34c9dd8e | aliguori | |
91 | 34c9dd8e | aliguori | s = qemu_mallocz(sizeof(*s));
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92 | 34c9dd8e | aliguori | if (s == NULL) |
93 | 34c9dd8e | aliguori | return NULL; |
94 | 34c9dd8e | aliguori | |
95 | 065e2813 | aliguori | s->get_error = socket_errno; |
96 | 065e2813 | aliguori | s->write = socket_write; |
97 | 065e2813 | aliguori | s->close = tcp_close; |
98 | 065e2813 | aliguori | s->mig_state.cancel = migrate_fd_cancel; |
99 | 065e2813 | aliguori | s->mig_state.get_status = migrate_fd_get_status; |
100 | 065e2813 | aliguori | s->mig_state.release = migrate_fd_release; |
101 | 34c9dd8e | aliguori | |
102 | 34c9dd8e | aliguori | s->state = MIG_STATE_ACTIVE; |
103 | 34c9dd8e | aliguori | s->detach = !async; |
104 | 34c9dd8e | aliguori | s->bandwidth_limit = bandwidth_limit; |
105 | 34c9dd8e | aliguori | s->fd = socket(PF_INET, SOCK_STREAM, 0);
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106 | 34c9dd8e | aliguori | if (s->fd == -1) { |
107 | 34c9dd8e | aliguori | qemu_free(s); |
108 | ff8d81d8 | aliguori | return NULL; |
109 | 34c9dd8e | aliguori | } |
110 | 34c9dd8e | aliguori | |
111 | 17e90973 | aliguori | socket_set_nonblock(s->fd); |
112 | 34c9dd8e | aliguori | |
113 | 34c9dd8e | aliguori | if (s->detach == 1) { |
114 | 34c9dd8e | aliguori | dprintf("detaching from monitor\n");
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115 | 34c9dd8e | aliguori | monitor_suspend(); |
116 | ff8d81d8 | aliguori | s->detach = 2;
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117 | 34c9dd8e | aliguori | } |
118 | 34c9dd8e | aliguori | |
119 | 34c9dd8e | aliguori | do {
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120 | 34c9dd8e | aliguori | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
121 | 34c9dd8e | aliguori | if (ret == -1) |
122 | 065e2813 | aliguori | ret = -(s->get_error(s)); |
123 | 34c9dd8e | aliguori | |
124 | c1d36665 | aliguori | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
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125 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); |
126 | 34c9dd8e | aliguori | } while (ret == -EINTR);
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127 | 34c9dd8e | aliguori | |
128 | c1d36665 | aliguori | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { |
129 | 34c9dd8e | aliguori | dprintf("connect failed\n");
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130 | 34c9dd8e | aliguori | close(s->fd); |
131 | 34c9dd8e | aliguori | qemu_free(s); |
132 | 88d2d9e0 | aliguori | return NULL; |
133 | 34c9dd8e | aliguori | } else if (ret >= 0) |
134 | 065e2813 | aliguori | migrate_fd_connect(s); |
135 | 34c9dd8e | aliguori | |
136 | 34c9dd8e | aliguori | return &s->mig_state;
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137 | 34c9dd8e | aliguori | } |
138 | 34c9dd8e | aliguori | |
139 | 34c9dd8e | aliguori | static void tcp_accept_incoming_migration(void *opaque) |
140 | 34c9dd8e | aliguori | { |
141 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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142 | 34c9dd8e | aliguori | socklen_t addrlen = sizeof(addr);
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143 | 34c9dd8e | aliguori | int s = (unsigned long)opaque; |
144 | 34c9dd8e | aliguori | QEMUFile *f; |
145 | 34c9dd8e | aliguori | int c, ret;
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146 | 34c9dd8e | aliguori | |
147 | 34c9dd8e | aliguori | do {
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148 | 34c9dd8e | aliguori | c = accept(s, (struct sockaddr *)&addr, &addrlen);
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149 | c1d36665 | aliguori | } while (c == -1 && socket_error() == EINTR); |
150 | 34c9dd8e | aliguori | |
151 | 34c9dd8e | aliguori | dprintf("accepted migration\n");
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152 | 34c9dd8e | aliguori | |
153 | 34c9dd8e | aliguori | if (c == -1) { |
154 | 34c9dd8e | aliguori | fprintf(stderr, "could not accept migration connection\n");
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155 | 34c9dd8e | aliguori | return;
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156 | 34c9dd8e | aliguori | } |
157 | 34c9dd8e | aliguori | |
158 | c1d36665 | aliguori | f = qemu_fopen_socket(c); |
159 | 34c9dd8e | aliguori | if (f == NULL) { |
160 | 34c9dd8e | aliguori | fprintf(stderr, "could not qemu_fopen socket\n");
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161 | 34c9dd8e | aliguori | goto out;
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162 | 34c9dd8e | aliguori | } |
163 | 34c9dd8e | aliguori | |
164 | 34c9dd8e | aliguori | vm_stop(0); /* just in case */ |
165 | 34c9dd8e | aliguori | ret = qemu_loadvm_state(f); |
166 | 34c9dd8e | aliguori | if (ret < 0) { |
167 | 34c9dd8e | aliguori | fprintf(stderr, "load of migration failed\n");
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168 | 34c9dd8e | aliguori | goto out_fopen;
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169 | 34c9dd8e | aliguori | } |
170 | 34c9dd8e | aliguori | qemu_announce_self(); |
171 | 34c9dd8e | aliguori | dprintf("successfully loaded vm state\n");
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172 | 34c9dd8e | aliguori | |
173 | 34c9dd8e | aliguori | /* we've successfully migrated, close the server socket */
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174 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
175 | 34c9dd8e | aliguori | close(s); |
176 | 34c9dd8e | aliguori | |
177 | 34c9dd8e | aliguori | vm_start(); |
178 | 34c9dd8e | aliguori | |
179 | 34c9dd8e | aliguori | out_fopen:
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180 | 34c9dd8e | aliguori | qemu_fclose(f); |
181 | 34c9dd8e | aliguori | out:
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182 | 34c9dd8e | aliguori | close(c); |
183 | 34c9dd8e | aliguori | } |
184 | 34c9dd8e | aliguori | |
185 | 34c9dd8e | aliguori | int tcp_start_incoming_migration(const char *host_port) |
186 | 34c9dd8e | aliguori | { |
187 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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188 | 34c9dd8e | aliguori | int val;
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189 | 34c9dd8e | aliguori | int s;
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190 | 34c9dd8e | aliguori | |
191 | 34c9dd8e | aliguori | if (parse_host_port(&addr, host_port) < 0) { |
192 | 34c9dd8e | aliguori | fprintf(stderr, "invalid host/port combination: %s\n", host_port);
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193 | 34c9dd8e | aliguori | return -EINVAL;
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194 | 34c9dd8e | aliguori | } |
195 | 34c9dd8e | aliguori | |
196 | 34c9dd8e | aliguori | s = socket(PF_INET, SOCK_STREAM, 0);
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197 | 34c9dd8e | aliguori | if (s == -1) |
198 | c1d36665 | aliguori | return -socket_error();
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199 | 34c9dd8e | aliguori | |
200 | 34c9dd8e | aliguori | val = 1;
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201 | 34c9dd8e | aliguori | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); |
202 | 34c9dd8e | aliguori | |
203 | 34c9dd8e | aliguori | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) |
204 | 34c9dd8e | aliguori | goto err;
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205 | 34c9dd8e | aliguori | |
206 | 34c9dd8e | aliguori | if (listen(s, 1) == -1) |
207 | 34c9dd8e | aliguori | goto err;
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208 | 34c9dd8e | aliguori | |
209 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, |
210 | 34c9dd8e | aliguori | (void *)(unsigned long)s); |
211 | 34c9dd8e | aliguori | |
212 | 34c9dd8e | aliguori | return 0; |
213 | 34c9dd8e | aliguori | |
214 | 34c9dd8e | aliguori | err:
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215 | 34c9dd8e | aliguori | close(s); |
216 | c1d36665 | aliguori | return -socket_error();
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217 | 34c9dd8e | aliguori | } |