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 } 225