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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 "buffered_file.h" |
20 | 34c9dd8e | aliguori | #include "block.h" |
21 | 34c9dd8e | aliguori | |
22 | 34c9dd8e | aliguori | //#define DEBUG_MIGRATION_TCP
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23 | 34c9dd8e | aliguori | |
24 | 34c9dd8e | aliguori | #ifdef DEBUG_MIGRATION_TCP
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25 | 34c9dd8e | aliguori | #define dprintf(fmt, ...) \
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26 | 34c9dd8e | aliguori | do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0) |
27 | 34c9dd8e | aliguori | #else
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28 | 34c9dd8e | aliguori | #define dprintf(fmt, ...) \
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29 | 34c9dd8e | aliguori | do { } while (0) |
30 | 34c9dd8e | aliguori | #endif
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31 | 34c9dd8e | aliguori | |
32 | 065e2813 | aliguori | static int socket_errno(FdMigrationState *s) |
33 | 34c9dd8e | aliguori | { |
34 | 8ad9fa5d | aliguori | return socket_error();
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35 | 34c9dd8e | aliguori | } |
36 | 34c9dd8e | aliguori | |
37 | 065e2813 | aliguori | static int socket_write(FdMigrationState *s, const void * buf, size_t size) |
38 | 34c9dd8e | aliguori | { |
39 | 065e2813 | aliguori | return send(s->fd, buf, size, 0); |
40 | 34c9dd8e | aliguori | } |
41 | 34c9dd8e | aliguori | |
42 | 065e2813 | aliguori | static int tcp_close(FdMigrationState *s) |
43 | 34c9dd8e | aliguori | { |
44 | 065e2813 | aliguori | dprintf("tcp_close\n");
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45 | 34c9dd8e | aliguori | if (s->fd != -1) { |
46 | ff8d81d8 | aliguori | close(s->fd); |
47 | ff8d81d8 | aliguori | s->fd = -1;
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48 | 34c9dd8e | aliguori | } |
49 | 34c9dd8e | aliguori | return 0; |
50 | 34c9dd8e | aliguori | } |
51 | 34c9dd8e | aliguori | |
52 | 34c9dd8e | aliguori | |
53 | 34c9dd8e | aliguori | static void tcp_wait_for_connect(void *opaque) |
54 | 34c9dd8e | aliguori | { |
55 | 34c9dd8e | aliguori | FdMigrationState *s = opaque; |
56 | 34c9dd8e | aliguori | int val, ret;
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57 | 4761a48b | blueswir1 | socklen_t valsize = sizeof(val);
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58 | 34c9dd8e | aliguori | |
59 | 34c9dd8e | aliguori | dprintf("connect completed\n");
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60 | 34c9dd8e | aliguori | do {
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61 | 34c9dd8e | aliguori | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize); |
62 | 065e2813 | aliguori | } while (ret == -1 && (s->get_error(s)) == EINTR); |
63 | 34c9dd8e | aliguori | |
64 | 34c9dd8e | aliguori | if (ret < 0) { |
65 | 065e2813 | aliguori | migrate_fd_error(s); |
66 | 34c9dd8e | aliguori | return;
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67 | 34c9dd8e | aliguori | } |
68 | 34c9dd8e | aliguori | |
69 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
70 | 34c9dd8e | aliguori | |
71 | 34c9dd8e | aliguori | if (val == 0) |
72 | 065e2813 | aliguori | migrate_fd_connect(s); |
73 | 34c9dd8e | aliguori | else {
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74 | 34c9dd8e | aliguori | dprintf("error connecting %d\n", val);
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75 | 065e2813 | aliguori | migrate_fd_error(s); |
76 | 34c9dd8e | aliguori | } |
77 | 34c9dd8e | aliguori | } |
78 | 34c9dd8e | aliguori | |
79 | 34c9dd8e | aliguori | MigrationState *tcp_start_outgoing_migration(const char *host_port, |
80 | ff8d81d8 | aliguori | int64_t bandwidth_limit, |
81 | 731b0364 | aliguori | int detach)
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82 | 34c9dd8e | aliguori | { |
83 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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84 | 34c9dd8e | aliguori | FdMigrationState *s; |
85 | 34c9dd8e | aliguori | int ret;
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86 | 34c9dd8e | aliguori | |
87 | 34c9dd8e | aliguori | if (parse_host_port(&addr, host_port) < 0) |
88 | 34c9dd8e | aliguori | return NULL; |
89 | 34c9dd8e | aliguori | |
90 | 34c9dd8e | aliguori | s = qemu_mallocz(sizeof(*s));
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91 | 34c9dd8e | aliguori | |
92 | 065e2813 | aliguori | s->get_error = socket_errno; |
93 | 065e2813 | aliguori | s->write = socket_write; |
94 | 065e2813 | aliguori | s->close = tcp_close; |
95 | 065e2813 | aliguori | s->mig_state.cancel = migrate_fd_cancel; |
96 | 065e2813 | aliguori | s->mig_state.get_status = migrate_fd_get_status; |
97 | 065e2813 | aliguori | s->mig_state.release = migrate_fd_release; |
98 | 34c9dd8e | aliguori | |
99 | 34c9dd8e | aliguori | s->state = MIG_STATE_ACTIVE; |
100 | 731b0364 | aliguori | s->mon_resume = NULL;
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101 | 34c9dd8e | aliguori | s->bandwidth_limit = bandwidth_limit; |
102 | 34c9dd8e | aliguori | s->fd = socket(PF_INET, SOCK_STREAM, 0);
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103 | 34c9dd8e | aliguori | if (s->fd == -1) { |
104 | 34c9dd8e | aliguori | qemu_free(s); |
105 | ff8d81d8 | aliguori | return NULL; |
106 | 34c9dd8e | aliguori | } |
107 | 34c9dd8e | aliguori | |
108 | 17e90973 | aliguori | socket_set_nonblock(s->fd); |
109 | 34c9dd8e | aliguori | |
110 | 731b0364 | aliguori | if (!detach)
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111 | 731b0364 | aliguori | migrate_fd_monitor_suspend(s); |
112 | 34c9dd8e | aliguori | |
113 | 34c9dd8e | aliguori | do {
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114 | 34c9dd8e | aliguori | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
115 | 34c9dd8e | aliguori | if (ret == -1) |
116 | 065e2813 | aliguori | ret = -(s->get_error(s)); |
117 | 34c9dd8e | aliguori | |
118 | c1d36665 | aliguori | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
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119 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s); |
120 | 34c9dd8e | aliguori | } while (ret == -EINTR);
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121 | 34c9dd8e | aliguori | |
122 | c1d36665 | aliguori | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { |
123 | 34c9dd8e | aliguori | dprintf("connect failed\n");
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124 | 34c9dd8e | aliguori | close(s->fd); |
125 | 34c9dd8e | aliguori | qemu_free(s); |
126 | 88d2d9e0 | aliguori | return NULL; |
127 | 34c9dd8e | aliguori | } else if (ret >= 0) |
128 | 065e2813 | aliguori | migrate_fd_connect(s); |
129 | 34c9dd8e | aliguori | |
130 | 34c9dd8e | aliguori | return &s->mig_state;
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131 | 34c9dd8e | aliguori | } |
132 | 34c9dd8e | aliguori | |
133 | 34c9dd8e | aliguori | static void tcp_accept_incoming_migration(void *opaque) |
134 | 34c9dd8e | aliguori | { |
135 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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136 | 34c9dd8e | aliguori | socklen_t addrlen = sizeof(addr);
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137 | 34c9dd8e | aliguori | int s = (unsigned long)opaque; |
138 | 34c9dd8e | aliguori | QEMUFile *f; |
139 | 34c9dd8e | aliguori | int c, ret;
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140 | 34c9dd8e | aliguori | |
141 | 34c9dd8e | aliguori | do {
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142 | 34c9dd8e | aliguori | c = accept(s, (struct sockaddr *)&addr, &addrlen);
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143 | c1d36665 | aliguori | } while (c == -1 && socket_error() == EINTR); |
144 | 34c9dd8e | aliguori | |
145 | 34c9dd8e | aliguori | dprintf("accepted migration\n");
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146 | 34c9dd8e | aliguori | |
147 | 34c9dd8e | aliguori | if (c == -1) { |
148 | 34c9dd8e | aliguori | fprintf(stderr, "could not accept migration connection\n");
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149 | 34c9dd8e | aliguori | return;
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150 | 34c9dd8e | aliguori | } |
151 | 34c9dd8e | aliguori | |
152 | c1d36665 | aliguori | f = qemu_fopen_socket(c); |
153 | 34c9dd8e | aliguori | if (f == NULL) { |
154 | 34c9dd8e | aliguori | fprintf(stderr, "could not qemu_fopen socket\n");
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155 | 34c9dd8e | aliguori | goto out;
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156 | 34c9dd8e | aliguori | } |
157 | 34c9dd8e | aliguori | |
158 | 34c9dd8e | aliguori | vm_stop(0); /* just in case */ |
159 | 34c9dd8e | aliguori | ret = qemu_loadvm_state(f); |
160 | 34c9dd8e | aliguori | if (ret < 0) { |
161 | 34c9dd8e | aliguori | fprintf(stderr, "load of migration failed\n");
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162 | 34c9dd8e | aliguori | goto out_fopen;
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163 | 34c9dd8e | aliguori | } |
164 | 34c9dd8e | aliguori | qemu_announce_self(); |
165 | 34c9dd8e | aliguori | dprintf("successfully loaded vm state\n");
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166 | 34c9dd8e | aliguori | |
167 | 34c9dd8e | aliguori | /* we've successfully migrated, close the server socket */
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168 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
169 | 34c9dd8e | aliguori | close(s); |
170 | 34c9dd8e | aliguori | |
171 | 34c9dd8e | aliguori | vm_start(); |
172 | 34c9dd8e | aliguori | |
173 | 34c9dd8e | aliguori | out_fopen:
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174 | 34c9dd8e | aliguori | qemu_fclose(f); |
175 | 34c9dd8e | aliguori | out:
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176 | 34c9dd8e | aliguori | close(c); |
177 | 34c9dd8e | aliguori | } |
178 | 34c9dd8e | aliguori | |
179 | 34c9dd8e | aliguori | int tcp_start_incoming_migration(const char *host_port) |
180 | 34c9dd8e | aliguori | { |
181 | 34c9dd8e | aliguori | struct sockaddr_in addr;
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182 | 34c9dd8e | aliguori | int val;
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183 | 34c9dd8e | aliguori | int s;
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184 | 34c9dd8e | aliguori | |
185 | 34c9dd8e | aliguori | if (parse_host_port(&addr, host_port) < 0) { |
186 | 34c9dd8e | aliguori | fprintf(stderr, "invalid host/port combination: %s\n", host_port);
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187 | 34c9dd8e | aliguori | return -EINVAL;
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188 | 34c9dd8e | aliguori | } |
189 | 34c9dd8e | aliguori | |
190 | 34c9dd8e | aliguori | s = socket(PF_INET, SOCK_STREAM, 0);
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191 | 34c9dd8e | aliguori | if (s == -1) |
192 | c1d36665 | aliguori | return -socket_error();
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193 | 34c9dd8e | aliguori | |
194 | 34c9dd8e | aliguori | val = 1;
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195 | 34c9dd8e | aliguori | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val)); |
196 | 34c9dd8e | aliguori | |
197 | 34c9dd8e | aliguori | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) |
198 | 34c9dd8e | aliguori | goto err;
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199 | 34c9dd8e | aliguori | |
200 | 34c9dd8e | aliguori | if (listen(s, 1) == -1) |
201 | 34c9dd8e | aliguori | goto err;
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202 | 34c9dd8e | aliguori | |
203 | 34c9dd8e | aliguori | qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL, |
204 | 34c9dd8e | aliguori | (void *)(unsigned long)s); |
205 | 34c9dd8e | aliguori | |
206 | 34c9dd8e | aliguori | return 0; |
207 | 34c9dd8e | aliguori | |
208 | 34c9dd8e | aliguori | err:
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209 | 34c9dd8e | aliguori | close(s); |
210 | c1d36665 | aliguori | return -socket_error();
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211 | 34c9dd8e | aliguori | } |