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1 | 4951f65b | Chris Lalancette | /*
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2 | 4951f65b | Chris Lalancette | * QEMU live migration via Unix Domain Sockets
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3 | 4951f65b | Chris Lalancette | *
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4 | 4951f65b | Chris Lalancette | * Copyright Red Hat, Inc. 2009
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5 | 4951f65b | Chris Lalancette | *
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6 | 4951f65b | Chris Lalancette | * Authors:
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7 | 4951f65b | Chris Lalancette | * Chris Lalancette <clalance@redhat.com>
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8 | 4951f65b | Chris Lalancette | *
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9 | 4951f65b | Chris Lalancette | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 4951f65b | Chris Lalancette | * the COPYING file in the top-level directory.
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11 | 4951f65b | Chris Lalancette | *
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12 | 4951f65b | Chris Lalancette | */
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13 | 4951f65b | Chris Lalancette | |
14 | 4951f65b | Chris Lalancette | #include "qemu-common.h" |
15 | 4951f65b | Chris Lalancette | #include "qemu_socket.h" |
16 | 4951f65b | Chris Lalancette | #include "migration.h" |
17 | 4951f65b | Chris Lalancette | #include "qemu-char.h" |
18 | 4951f65b | Chris Lalancette | #include "buffered_file.h" |
19 | 4951f65b | Chris Lalancette | #include "block.h" |
20 | 4951f65b | Chris Lalancette | |
21 | 4951f65b | Chris Lalancette | //#define DEBUG_MIGRATION_UNIX
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22 | 4951f65b | Chris Lalancette | |
23 | 4951f65b | Chris Lalancette | #ifdef DEBUG_MIGRATION_UNIX
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24 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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25 | 4951f65b | Chris Lalancette | do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0) |
26 | 4951f65b | Chris Lalancette | #else
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27 | d0f2c4c6 | malc | #define DPRINTF(fmt, ...) \
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28 | 4951f65b | Chris Lalancette | do { } while (0) |
29 | 4951f65b | Chris Lalancette | #endif
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30 | 4951f65b | Chris Lalancette | |
31 | 4951f65b | Chris Lalancette | static int unix_errno(FdMigrationState *s) |
32 | 4951f65b | Chris Lalancette | { |
33 | 4951f65b | Chris Lalancette | return errno;
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34 | 4951f65b | Chris Lalancette | } |
35 | 4951f65b | Chris Lalancette | |
36 | 4951f65b | Chris Lalancette | static int unix_write(FdMigrationState *s, const void * buf, size_t size) |
37 | 4951f65b | Chris Lalancette | { |
38 | 4951f65b | Chris Lalancette | return write(s->fd, buf, size);
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39 | 4951f65b | Chris Lalancette | } |
40 | 4951f65b | Chris Lalancette | |
41 | 4951f65b | Chris Lalancette | static int unix_close(FdMigrationState *s) |
42 | 4951f65b | Chris Lalancette | { |
43 | d0f2c4c6 | malc | DPRINTF("unix_close\n");
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44 | 4951f65b | Chris Lalancette | if (s->fd != -1) { |
45 | 4951f65b | Chris Lalancette | close(s->fd); |
46 | 4951f65b | Chris Lalancette | s->fd = -1;
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47 | 4951f65b | Chris Lalancette | } |
48 | 4951f65b | Chris Lalancette | return 0; |
49 | 4951f65b | Chris Lalancette | } |
50 | 4951f65b | Chris Lalancette | |
51 | 4951f65b | Chris Lalancette | static void unix_wait_for_connect(void *opaque) |
52 | 4951f65b | Chris Lalancette | { |
53 | 4951f65b | Chris Lalancette | FdMigrationState *s = opaque; |
54 | 4951f65b | Chris Lalancette | int val, ret;
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55 | 4951f65b | Chris Lalancette | socklen_t valsize = sizeof(val);
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56 | 4951f65b | Chris Lalancette | |
57 | d0f2c4c6 | malc | DPRINTF("connect completed\n");
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58 | 4951f65b | Chris Lalancette | do {
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59 | 4951f65b | Chris Lalancette | ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
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60 | 4951f65b | Chris Lalancette | } while (ret == -1 && (s->get_error(s)) == EINTR); |
61 | 4951f65b | Chris Lalancette | |
62 | 4951f65b | Chris Lalancette | if (ret < 0) { |
63 | 4951f65b | Chris Lalancette | migrate_fd_error(s); |
64 | 4951f65b | Chris Lalancette | return;
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65 | 4951f65b | Chris Lalancette | } |
66 | 4951f65b | Chris Lalancette | |
67 | 4951f65b | Chris Lalancette | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
68 | 4951f65b | Chris Lalancette | |
69 | 4951f65b | Chris Lalancette | if (val == 0) |
70 | 4951f65b | Chris Lalancette | migrate_fd_connect(s); |
71 | 4951f65b | Chris Lalancette | else {
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72 | d0f2c4c6 | malc | DPRINTF("error connecting %d\n", val);
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73 | 4951f65b | Chris Lalancette | migrate_fd_error(s); |
74 | 4951f65b | Chris Lalancette | } |
75 | 4951f65b | Chris Lalancette | } |
76 | 4951f65b | Chris Lalancette | |
77 | f327aa0c | Jan Kiszka | MigrationState *unix_start_outgoing_migration(Monitor *mon, |
78 | f327aa0c | Jan Kiszka | const char *path, |
79 | 4951f65b | Chris Lalancette | int64_t bandwidth_limit, |
80 | c163b5ca | lirans@il.ibm.com | int detach,
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81 | c163b5ca | lirans@il.ibm.com | int blk,
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82 | c163b5ca | lirans@il.ibm.com | int inc)
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83 | 4951f65b | Chris Lalancette | { |
84 | 4951f65b | Chris Lalancette | FdMigrationState *s; |
85 | 4951f65b | Chris Lalancette | struct sockaddr_un addr;
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86 | 4951f65b | Chris Lalancette | int ret;
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87 | 4951f65b | Chris Lalancette | |
88 | 4951f65b | Chris Lalancette | addr.sun_family = AF_UNIX; |
89 | 4951f65b | Chris Lalancette | snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path); |
90 | 4951f65b | Chris Lalancette | |
91 | 4951f65b | Chris Lalancette | s = qemu_mallocz(sizeof(*s));
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92 | 4951f65b | Chris Lalancette | |
93 | 4951f65b | Chris Lalancette | s->get_error = unix_errno; |
94 | 4951f65b | Chris Lalancette | s->write = unix_write; |
95 | 4951f65b | Chris Lalancette | s->close = unix_close; |
96 | 4951f65b | Chris Lalancette | s->mig_state.cancel = migrate_fd_cancel; |
97 | 4951f65b | Chris Lalancette | s->mig_state.get_status = migrate_fd_get_status; |
98 | 4951f65b | Chris Lalancette | s->mig_state.release = migrate_fd_release; |
99 | 4951f65b | Chris Lalancette | |
100 | c163b5ca | lirans@il.ibm.com | s->mig_state.blk = blk; |
101 | c163b5ca | lirans@il.ibm.com | s->mig_state.shared = inc; |
102 | c163b5ca | lirans@il.ibm.com | |
103 | 4951f65b | Chris Lalancette | s->state = MIG_STATE_ACTIVE; |
104 | f327aa0c | Jan Kiszka | s->mon = NULL;
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105 | 4951f65b | Chris Lalancette | s->bandwidth_limit = bandwidth_limit; |
106 | 40ff6d7e | Kevin Wolf | s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
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107 | 4951f65b | Chris Lalancette | if (s->fd < 0) { |
108 | d0f2c4c6 | malc | DPRINTF("Unable to open socket");
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109 | 4951f65b | Chris Lalancette | goto err_after_alloc;
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110 | 4951f65b | Chris Lalancette | } |
111 | 4951f65b | Chris Lalancette | |
112 | 4951f65b | Chris Lalancette | socket_set_nonblock(s->fd); |
113 | 4951f65b | Chris Lalancette | |
114 | 4951f65b | Chris Lalancette | do {
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115 | 4951f65b | Chris Lalancette | ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr)); |
116 | 4951f65b | Chris Lalancette | if (ret == -1) |
117 | 4951f65b | Chris Lalancette | ret = -(s->get_error(s)); |
118 | 4951f65b | Chris Lalancette | |
119 | 4951f65b | Chris Lalancette | if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
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120 | 4951f65b | Chris Lalancette | qemu_set_fd_handler2(s->fd, NULL, NULL, unix_wait_for_connect, s); |
121 | 4951f65b | Chris Lalancette | } while (ret == -EINTR);
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122 | 4951f65b | Chris Lalancette | |
123 | 4951f65b | Chris Lalancette | if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) { |
124 | d0f2c4c6 | malc | DPRINTF("connect failed\n");
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125 | 4951f65b | Chris Lalancette | goto err_after_open;
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126 | 2dd650e5 | Daniel P. Berrange | } |
127 | 2dd650e5 | Daniel P. Berrange | |
128 | 2dd650e5 | Daniel P. Berrange | if (!detach) {
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129 | 2dd650e5 | Daniel P. Berrange | migrate_fd_monitor_suspend(s, mon); |
130 | 2dd650e5 | Daniel P. Berrange | } |
131 | 2dd650e5 | Daniel P. Berrange | |
132 | 2dd650e5 | Daniel P. Berrange | if (ret >= 0) |
133 | 4951f65b | Chris Lalancette | migrate_fd_connect(s); |
134 | 4951f65b | Chris Lalancette | |
135 | 4951f65b | Chris Lalancette | return &s->mig_state;
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136 | 4951f65b | Chris Lalancette | |
137 | 4951f65b | Chris Lalancette | err_after_open:
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138 | 4951f65b | Chris Lalancette | close(s->fd); |
139 | 4951f65b | Chris Lalancette | |
140 | 4951f65b | Chris Lalancette | err_after_alloc:
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141 | 4951f65b | Chris Lalancette | qemu_free(s); |
142 | 4951f65b | Chris Lalancette | return NULL; |
143 | 4951f65b | Chris Lalancette | } |
144 | 4951f65b | Chris Lalancette | |
145 | 4951f65b | Chris Lalancette | static void unix_accept_incoming_migration(void *opaque) |
146 | 4951f65b | Chris Lalancette | { |
147 | 4951f65b | Chris Lalancette | struct sockaddr_un addr;
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148 | 4951f65b | Chris Lalancette | socklen_t addrlen = sizeof(addr);
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149 | e0efb993 | Stefan Weil | int s = (intptr_t)opaque;
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150 | 4951f65b | Chris Lalancette | QEMUFile *f; |
151 | 511c0231 | Juan Quintela | int c;
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152 | 4951f65b | Chris Lalancette | |
153 | 4951f65b | Chris Lalancette | do {
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154 | 40ff6d7e | Kevin Wolf | c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
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155 | 4951f65b | Chris Lalancette | } while (c == -1 && socket_error() == EINTR); |
156 | 4951f65b | Chris Lalancette | |
157 | d0f2c4c6 | malc | DPRINTF("accepted migration\n");
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158 | 4951f65b | Chris Lalancette | |
159 | 4951f65b | Chris Lalancette | if (c == -1) { |
160 | 4951f65b | Chris Lalancette | fprintf(stderr, "could not accept migration connection\n");
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161 | 4951f65b | Chris Lalancette | return;
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162 | 4951f65b | Chris Lalancette | } |
163 | 4951f65b | Chris Lalancette | |
164 | 4951f65b | Chris Lalancette | f = qemu_fopen_socket(c); |
165 | 4951f65b | Chris Lalancette | if (f == NULL) { |
166 | 4951f65b | Chris Lalancette | fprintf(stderr, "could not qemu_fopen socket\n");
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167 | 4951f65b | Chris Lalancette | goto out;
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168 | 4951f65b | Chris Lalancette | } |
169 | 4951f65b | Chris Lalancette | |
170 | 511c0231 | Juan Quintela | process_incoming_migration(f); |
171 | 4951f65b | Chris Lalancette | qemu_fclose(f); |
172 | 4951f65b | Chris Lalancette | out:
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173 | cfaf6d36 | Juan Quintela | qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL); |
174 | cfaf6d36 | Juan Quintela | close(s); |
175 | 4951f65b | Chris Lalancette | close(c); |
176 | 4951f65b | Chris Lalancette | } |
177 | 4951f65b | Chris Lalancette | |
178 | 4951f65b | Chris Lalancette | int unix_start_incoming_migration(const char *path) |
179 | 4951f65b | Chris Lalancette | { |
180 | 4951f65b | Chris Lalancette | struct sockaddr_un un;
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181 | 4951f65b | Chris Lalancette | int sock;
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182 | 4951f65b | Chris Lalancette | |
183 | d0f2c4c6 | malc | DPRINTF("Attempting to start an incoming migration\n");
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184 | 4951f65b | Chris Lalancette | |
185 | 40ff6d7e | Kevin Wolf | sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
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186 | 4951f65b | Chris Lalancette | if (sock < 0) { |
187 | 4951f65b | Chris Lalancette | fprintf(stderr, "Could not open unix socket: %s\n", strerror(errno));
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188 | 4951f65b | Chris Lalancette | return -EINVAL;
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189 | 4951f65b | Chris Lalancette | } |
190 | 4951f65b | Chris Lalancette | |
191 | 4951f65b | Chris Lalancette | memset(&un, 0, sizeof(un)); |
192 | 4951f65b | Chris Lalancette | un.sun_family = AF_UNIX; |
193 | 4951f65b | Chris Lalancette | snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); |
194 | 4951f65b | Chris Lalancette | |
195 | 4951f65b | Chris Lalancette | unlink(un.sun_path); |
196 | 4951f65b | Chris Lalancette | if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { |
197 | 4951f65b | Chris Lalancette | fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
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198 | 4951f65b | Chris Lalancette | goto err;
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199 | 4951f65b | Chris Lalancette | } |
200 | 4951f65b | Chris Lalancette | if (listen(sock, 1) < 0) { |
201 | 4951f65b | Chris Lalancette | fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
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202 | 4951f65b | Chris Lalancette | goto err;
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203 | 4951f65b | Chris Lalancette | } |
204 | 4951f65b | Chris Lalancette | |
205 | 4951f65b | Chris Lalancette | qemu_set_fd_handler2(sock, NULL, unix_accept_incoming_migration, NULL, |
206 | e0efb993 | Stefan Weil | (void *)(intptr_t)sock);
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207 | 4951f65b | Chris Lalancette | |
208 | 4951f65b | Chris Lalancette | return 0; |
209 | 4951f65b | Chris Lalancette | |
210 | 4951f65b | Chris Lalancette | err:
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211 | 4951f65b | Chris Lalancette | close(sock); |
212 | 4951f65b | Chris Lalancette | |
213 | 4951f65b | Chris Lalancette | return -EINVAL;
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214 | 4951f65b | Chris Lalancette | } |