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1 | /* | |
2 | * QEMU live migration via socket | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2009-2016 | |
5 | * | |
6 | * Authors: | |
7 | * Chris Lalancette <clalance@redhat.com> | |
8 | * Daniel P. Berrange <berrange@redhat.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
11 | * the COPYING file in the top-level directory. | |
12 | * | |
13 | * Contributions after 2012-01-13 are licensed under the terms of the | |
14 | * GNU GPL, version 2 or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include "qemu/osdep.h" | |
18 | #include "qemu/cutils.h" | |
19 | ||
20 | #include "qemu/error-report.h" | |
21 | #include "qapi/error.h" | |
22 | #include "channel.h" | |
23 | #include "socket.h" | |
24 | #include "migration.h" | |
25 | #include "qemu-file.h" | |
26 | #include "io/channel-socket.h" | |
27 | #include "io/net-listener.h" | |
28 | #include "trace.h" | |
29 | #include "postcopy-ram.h" | |
30 | #include "options.h" | |
31 | #include "qapi/clone-visitor.h" | |
32 | #include "qapi/qapi-visit-sockets.h" | |
33 | ||
34 | struct SocketOutgoingArgs { | |
35 | SocketAddress *saddr; | |
36 | } outgoing_args; | |
37 | ||
38 | void socket_send_channel_create(QIOTaskFunc f, void *data) | |
39 | { | |
40 | QIOChannelSocket *sioc = qio_channel_socket_new(); | |
41 | qio_channel_socket_connect_async(sioc, outgoing_args.saddr, | |
42 | f, data, NULL, NULL); | |
43 | } | |
44 | ||
45 | QIOChannel *socket_send_channel_create_sync(Error **errp) | |
46 | { | |
47 | QIOChannelSocket *sioc = qio_channel_socket_new(); | |
48 | ||
49 | if (!outgoing_args.saddr) { | |
50 | object_unref(OBJECT(sioc)); | |
51 | error_setg(errp, "Initial sock address not set!"); | |
52 | return NULL; | |
53 | } | |
54 | ||
55 | if (qio_channel_socket_connect_sync(sioc, outgoing_args.saddr, errp) < 0) { | |
56 | object_unref(OBJECT(sioc)); | |
57 | return NULL; | |
58 | } | |
59 | ||
60 | return QIO_CHANNEL(sioc); | |
61 | } | |
62 | ||
63 | struct SocketConnectData { | |
64 | MigrationState *s; | |
65 | char *hostname; | |
66 | }; | |
67 | ||
68 | static void socket_connect_data_free(void *opaque) | |
69 | { | |
70 | struct SocketConnectData *data = opaque; | |
71 | if (!data) { | |
72 | return; | |
73 | } | |
74 | g_free(data->hostname); | |
75 | g_free(data); | |
76 | } | |
77 | ||
78 | static void socket_outgoing_migration(QIOTask *task, | |
79 | gpointer opaque) | |
80 | { | |
81 | struct SocketConnectData *data = opaque; | |
82 | QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); | |
83 | Error *err = NULL; | |
84 | ||
85 | if (qio_task_propagate_error(task, &err)) { | |
86 | trace_migration_socket_outgoing_error(error_get_pretty(err)); | |
87 | goto out; | |
88 | } | |
89 | ||
90 | trace_migration_socket_outgoing_connected(data->hostname); | |
91 | ||
92 | if (migrate_zero_copy_send() && | |
93 | !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) { | |
94 | error_setg(&err, "Zero copy send feature not detected in host kernel"); | |
95 | } | |
96 | ||
97 | out: | |
98 | migration_channel_connect(data->s, sioc, data->hostname, err); | |
99 | object_unref(OBJECT(sioc)); | |
100 | } | |
101 | ||
102 | void socket_start_outgoing_migration(MigrationState *s, | |
103 | SocketAddress *saddr, | |
104 | Error **errp) | |
105 | { | |
106 | QIOChannelSocket *sioc = qio_channel_socket_new(); | |
107 | struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); | |
108 | SocketAddress *addr = QAPI_CLONE(SocketAddress, saddr); | |
109 | ||
110 | data->s = s; | |
111 | ||
112 | /* in case previous migration leaked it */ | |
113 | qapi_free_SocketAddress(outgoing_args.saddr); | |
114 | outgoing_args.saddr = addr; | |
115 | ||
116 | if (saddr->type == SOCKET_ADDRESS_TYPE_INET) { | |
117 | data->hostname = g_strdup(saddr->u.inet.host); | |
118 | } | |
119 | ||
120 | qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing"); | |
121 | qio_channel_socket_connect_async(sioc, | |
122 | saddr, | |
123 | socket_outgoing_migration, | |
124 | data, | |
125 | socket_connect_data_free, | |
126 | NULL); | |
127 | } | |
128 | ||
129 | void socket_cleanup_outgoing_migration(void) | |
130 | { | |
131 | if (outgoing_args.saddr) { | |
132 | qapi_free_SocketAddress(outgoing_args.saddr); | |
133 | outgoing_args.saddr = NULL; | |
134 | } | |
135 | } | |
136 | ||
137 | static void socket_accept_incoming_migration(QIONetListener *listener, | |
138 | QIOChannelSocket *cioc, | |
139 | gpointer opaque) | |
140 | { | |
141 | trace_migration_socket_incoming_accepted(); | |
142 | ||
143 | if (migration_has_all_channels()) { | |
144 | error_report("%s: Extra incoming migration connection; ignoring", | |
145 | __func__); | |
146 | return; | |
147 | } | |
148 | ||
149 | qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming"); | |
150 | migration_channel_process_incoming(QIO_CHANNEL(cioc)); | |
151 | } | |
152 | ||
153 | static void | |
154 | socket_incoming_migration_end(void *opaque) | |
155 | { | |
156 | QIONetListener *listener = opaque; | |
157 | ||
158 | qio_net_listener_disconnect(listener); | |
159 | object_unref(OBJECT(listener)); | |
160 | } | |
161 | ||
162 | void socket_start_incoming_migration(SocketAddress *saddr, | |
163 | Error **errp) | |
164 | { | |
165 | QIONetListener *listener = qio_net_listener_new(); | |
166 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
167 | size_t i; | |
168 | int num = 1; | |
169 | ||
170 | qio_net_listener_set_name(listener, "migration-socket-listener"); | |
171 | ||
172 | if (migrate_multifd()) { | |
173 | num = migrate_multifd_channels(); | |
174 | } else if (migrate_postcopy_preempt()) { | |
175 | num = RAM_CHANNEL_MAX; | |
176 | } | |
177 | ||
178 | if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) { | |
179 | object_unref(OBJECT(listener)); | |
180 | return; | |
181 | } | |
182 | ||
183 | mis->transport_data = listener; | |
184 | mis->transport_cleanup = socket_incoming_migration_end; | |
185 | ||
186 | qio_net_listener_set_client_func_full(listener, | |
187 | socket_accept_incoming_migration, | |
188 | NULL, NULL, | |
189 | g_main_context_get_thread_default()); | |
190 | ||
191 | for (i = 0; i < listener->nsioc; i++) { | |
192 | SocketAddress *address = | |
193 | qio_channel_socket_get_local_address(listener->sioc[i], errp); | |
194 | if (!address) { | |
195 | return; | |
196 | } | |
197 | migrate_add_address(address); | |
198 | qapi_free_SocketAddress(address); | |
199 | } | |
200 | } | |
201 |