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
socket_send_channel_create(QIOTaskFunc f,void * data)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 struct SocketConnectData {
46 MigrationState *s;
47 char *hostname;
48 };
49
socket_connect_data_free(void * opaque)50 static void socket_connect_data_free(void *opaque)
51 {
52 struct SocketConnectData *data = opaque;
53 if (!data) {
54 return;
55 }
56 g_free(data->hostname);
57 g_free(data);
58 }
59
socket_outgoing_migration(QIOTask * task,gpointer opaque)60 static void socket_outgoing_migration(QIOTask *task,
61 gpointer opaque)
62 {
63 struct SocketConnectData *data = opaque;
64 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
65 Error *err = NULL;
66
67 if (qio_task_propagate_error(task, &err)) {
68 trace_migration_socket_outgoing_error(error_get_pretty(err));
69 goto out;
70 }
71
72 trace_migration_socket_outgoing_connected(data->hostname);
73
74 if (migrate_zero_copy_send() &&
75 !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
76 error_setg(&err, "Zero copy send feature not detected in host kernel");
77 }
78
79 out:
80 migration_channel_connect(data->s, sioc, data->hostname, err);
81 object_unref(OBJECT(sioc));
82 }
83
socket_start_outgoing_migration(MigrationState * s,SocketAddress * saddr,Error ** errp)84 void socket_start_outgoing_migration(MigrationState *s,
85 SocketAddress *saddr,
86 Error **errp)
87 {
88 QIOChannelSocket *sioc = qio_channel_socket_new();
89 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
90 SocketAddress *addr = QAPI_CLONE(SocketAddress, saddr);
91
92 data->s = s;
93
94 /* in case previous migration leaked it */
95 qapi_free_SocketAddress(outgoing_args.saddr);
96 outgoing_args.saddr = addr;
97
98 if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
99 data->hostname = g_strdup(saddr->u.inet.host);
100 }
101
102 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
103 qio_channel_socket_connect_async(sioc,
104 saddr,
105 socket_outgoing_migration,
106 data,
107 socket_connect_data_free,
108 NULL);
109 }
110
socket_cleanup_outgoing_migration(void)111 void socket_cleanup_outgoing_migration(void)
112 {
113 if (outgoing_args.saddr) {
114 qapi_free_SocketAddress(outgoing_args.saddr);
115 outgoing_args.saddr = NULL;
116 }
117 }
118
socket_accept_incoming_migration(QIONetListener * listener,QIOChannelSocket * cioc,gpointer opaque)119 static void socket_accept_incoming_migration(QIONetListener *listener,
120 QIOChannelSocket *cioc,
121 gpointer opaque)
122 {
123 trace_migration_socket_incoming_accepted();
124
125 if (migration_has_all_channels()) {
126 error_report("%s: Extra incoming migration connection; ignoring",
127 __func__);
128 return;
129 }
130
131 qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
132 migration_channel_process_incoming(QIO_CHANNEL(cioc));
133 }
134
135 static void
socket_incoming_migration_end(void * opaque)136 socket_incoming_migration_end(void *opaque)
137 {
138 QIONetListener *listener = opaque;
139
140 qio_net_listener_disconnect(listener);
141 object_unref(OBJECT(listener));
142 }
143
socket_start_incoming_migration(SocketAddress * saddr,Error ** errp)144 void socket_start_incoming_migration(SocketAddress *saddr,
145 Error **errp)
146 {
147 QIONetListener *listener = qio_net_listener_new();
148 MigrationIncomingState *mis = migration_incoming_get_current();
149 size_t i;
150 int num = 1;
151
152 qio_net_listener_set_name(listener, "migration-socket-listener");
153
154 if (migrate_multifd()) {
155 num = migrate_multifd_channels();
156 } else if (migrate_postcopy_preempt()) {
157 num = RAM_CHANNEL_MAX;
158 }
159
160 if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
161 object_unref(OBJECT(listener));
162 return;
163 }
164
165 mis->transport_data = listener;
166 mis->transport_cleanup = socket_incoming_migration_end;
167
168 qio_net_listener_set_client_func_full(listener,
169 socket_accept_incoming_migration,
170 NULL, NULL,
171 g_main_context_get_thread_default());
172
173 for (i = 0; i < listener->nsioc; i++) {
174 SocketAddress *address =
175 qio_channel_socket_get_local_address(listener->sioc[i], errp);
176 if (!address) {
177 return;
178 }
179 migrate_add_address(address);
180 qapi_free_SocketAddress(address);
181 }
182 }
183
184