Merge tag 'linux-user-for-8.0-pull-request' of https://gitlab.com/laurent_vivier...
[qemu.git] / migration / socket.c
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
31 struct SocketOutgoingArgs {
32 SocketAddress *saddr;
33 } outgoing_args;
34
35 void socket_send_channel_create(QIOTaskFunc f, void *data)
36 {
37 QIOChannelSocket *sioc = qio_channel_socket_new();
38 qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
39 f, data, NULL, NULL);
40 }
41
42 QIOChannel *socket_send_channel_create_sync(Error **errp)
43 {
44 QIOChannelSocket *sioc = qio_channel_socket_new();
45
46 if (!outgoing_args.saddr) {
47 object_unref(OBJECT(sioc));
48 error_setg(errp, "Initial sock address not set!");
49 return NULL;
50 }
51
52 if (qio_channel_socket_connect_sync(sioc, outgoing_args.saddr, errp) < 0) {
53 object_unref(OBJECT(sioc));
54 return NULL;
55 }
56
57 return QIO_CHANNEL(sioc);
58 }
59
60 int socket_send_channel_destroy(QIOChannel *send)
61 {
62 /* Remove channel */
63 object_unref(OBJECT(send));
64 if (outgoing_args.saddr) {
65 qapi_free_SocketAddress(outgoing_args.saddr);
66 outgoing_args.saddr = NULL;
67 }
68 return 0;
69 }
70
71 struct SocketConnectData {
72 MigrationState *s;
73 char *hostname;
74 };
75
76 static void socket_connect_data_free(void *opaque)
77 {
78 struct SocketConnectData *data = opaque;
79 if (!data) {
80 return;
81 }
82 g_free(data->hostname);
83 g_free(data);
84 }
85
86 static void socket_outgoing_migration(QIOTask *task,
87 gpointer opaque)
88 {
89 struct SocketConnectData *data = opaque;
90 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
91 Error *err = NULL;
92
93 if (qio_task_propagate_error(task, &err)) {
94 trace_migration_socket_outgoing_error(error_get_pretty(err));
95 goto out;
96 }
97
98 trace_migration_socket_outgoing_connected(data->hostname);
99
100 if (migrate_use_zero_copy_send() &&
101 !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
102 error_setg(&err, "Zero copy send feature not detected in host kernel");
103 }
104
105 out:
106 migration_channel_connect(data->s, sioc, data->hostname, err);
107 object_unref(OBJECT(sioc));
108 }
109
110 static void
111 socket_start_outgoing_migration_internal(MigrationState *s,
112 SocketAddress *saddr,
113 Error **errp)
114 {
115 QIOChannelSocket *sioc = qio_channel_socket_new();
116 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
117
118 data->s = s;
119
120 /* in case previous migration leaked it */
121 qapi_free_SocketAddress(outgoing_args.saddr);
122 outgoing_args.saddr = saddr;
123
124 if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
125 data->hostname = g_strdup(saddr->u.inet.host);
126 }
127
128 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
129 qio_channel_socket_connect_async(sioc,
130 saddr,
131 socket_outgoing_migration,
132 data,
133 socket_connect_data_free,
134 NULL);
135 }
136
137 void socket_start_outgoing_migration(MigrationState *s,
138 const char *str,
139 Error **errp)
140 {
141 Error *err = NULL;
142 SocketAddress *saddr = socket_parse(str, &err);
143 if (!err) {
144 socket_start_outgoing_migration_internal(s, saddr, &err);
145 }
146 error_propagate(errp, err);
147 }
148
149 static void socket_accept_incoming_migration(QIONetListener *listener,
150 QIOChannelSocket *cioc,
151 gpointer opaque)
152 {
153 trace_migration_socket_incoming_accepted();
154
155 if (migration_has_all_channels()) {
156 error_report("%s: Extra incoming migration connection; ignoring",
157 __func__);
158 return;
159 }
160
161 qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
162 migration_channel_process_incoming(QIO_CHANNEL(cioc));
163 }
164
165 static void
166 socket_incoming_migration_end(void *opaque)
167 {
168 QIONetListener *listener = opaque;
169
170 qio_net_listener_disconnect(listener);
171 object_unref(OBJECT(listener));
172 }
173
174 static void
175 socket_start_incoming_migration_internal(SocketAddress *saddr,
176 Error **errp)
177 {
178 QIONetListener *listener = qio_net_listener_new();
179 MigrationIncomingState *mis = migration_incoming_get_current();
180 size_t i;
181 int num = 1;
182
183 qio_net_listener_set_name(listener, "migration-socket-listener");
184
185 if (migrate_use_multifd()) {
186 num = migrate_multifd_channels();
187 } else if (migrate_postcopy_preempt()) {
188 num = RAM_CHANNEL_MAX;
189 }
190
191 if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
192 object_unref(OBJECT(listener));
193 return;
194 }
195
196 mis->transport_data = listener;
197 mis->transport_cleanup = socket_incoming_migration_end;
198
199 qio_net_listener_set_client_func_full(listener,
200 socket_accept_incoming_migration,
201 NULL, NULL,
202 g_main_context_get_thread_default());
203
204 for (i = 0; i < listener->nsioc; i++) {
205 SocketAddress *address =
206 qio_channel_socket_get_local_address(listener->sioc[i], errp);
207 if (!address) {
208 return;
209 }
210 migrate_add_address(address);
211 qapi_free_SocketAddress(address);
212 }
213 }
214
215 void socket_start_incoming_migration(const char *str, Error **errp)
216 {
217 Error *err = NULL;
218 SocketAddress *saddr = socket_parse(str, &err);
219 if (!err) {
220 socket_start_incoming_migration_internal(saddr, &err);
221 }
222 qapi_free_SocketAddress(saddr);
223 error_propagate(errp, err);
224 }