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 int socket_send_channel_destroy(QIOChannel *send) 64 { 65 /* Remove channel */ 66 object_unref(OBJECT(send)); 67 return 0; 68 } 69 70 struct SocketConnectData { 71 MigrationState *s; 72 char *hostname; 73 }; 74 75 static void socket_connect_data_free(void *opaque) 76 { 77 struct SocketConnectData *data = opaque; 78 if (!data) { 79 return; 80 } 81 g_free(data->hostname); 82 g_free(data); 83 } 84 85 static void socket_outgoing_migration(QIOTask *task, 86 gpointer opaque) 87 { 88 struct SocketConnectData *data = opaque; 89 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); 90 Error *err = NULL; 91 92 if (qio_task_propagate_error(task, &err)) { 93 trace_migration_socket_outgoing_error(error_get_pretty(err)); 94 goto out; 95 } 96 97 trace_migration_socket_outgoing_connected(data->hostname); 98 99 if (migrate_zero_copy_send() && 100 !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) { 101 error_setg(&err, "Zero copy send feature not detected in host kernel"); 102 } 103 104 out: 105 migration_channel_connect(data->s, sioc, data->hostname, err); 106 object_unref(OBJECT(sioc)); 107 } 108 109 void socket_start_outgoing_migration(MigrationState *s, 110 SocketAddress *saddr, 111 Error **errp) 112 { 113 QIOChannelSocket *sioc = qio_channel_socket_new(); 114 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); 115 SocketAddress *addr = QAPI_CLONE(SocketAddress, saddr); 116 117 data->s = s; 118 119 /* in case previous migration leaked it */ 120 qapi_free_SocketAddress(outgoing_args.saddr); 121 outgoing_args.saddr = addr; 122 123 if (saddr->type == SOCKET_ADDRESS_TYPE_INET) { 124 data->hostname = g_strdup(saddr->u.inet.host); 125 } 126 127 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing"); 128 qio_channel_socket_connect_async(sioc, 129 saddr, 130 socket_outgoing_migration, 131 data, 132 socket_connect_data_free, 133 NULL); 134 } 135 136 void socket_cleanup_outgoing_migration(void) 137 { 138 if (outgoing_args.saddr) { 139 qapi_free_SocketAddress(outgoing_args.saddr); 140 outgoing_args.saddr = NULL; 141 } 142 } 143 144 static void socket_accept_incoming_migration(QIONetListener *listener, 145 QIOChannelSocket *cioc, 146 gpointer opaque) 147 { 148 trace_migration_socket_incoming_accepted(); 149 150 if (migration_has_all_channels()) { 151 error_report("%s: Extra incoming migration connection; ignoring", 152 __func__); 153 return; 154 } 155 156 qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming"); 157 migration_channel_process_incoming(QIO_CHANNEL(cioc)); 158 } 159 160 static void 161 socket_incoming_migration_end(void *opaque) 162 { 163 QIONetListener *listener = opaque; 164 165 qio_net_listener_disconnect(listener); 166 object_unref(OBJECT(listener)); 167 } 168 169 void socket_start_incoming_migration(SocketAddress *saddr, 170 Error **errp) 171 { 172 QIONetListener *listener = qio_net_listener_new(); 173 MigrationIncomingState *mis = migration_incoming_get_current(); 174 size_t i; 175 int num = 1; 176 177 qio_net_listener_set_name(listener, "migration-socket-listener"); 178 179 if (migrate_multifd()) { 180 num = migrate_multifd_channels(); 181 } else if (migrate_postcopy_preempt()) { 182 num = RAM_CHANNEL_MAX; 183 } 184 185 if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) { 186 object_unref(OBJECT(listener)); 187 return; 188 } 189 190 mis->transport_data = listener; 191 mis->transport_cleanup = socket_incoming_migration_end; 192 193 qio_net_listener_set_client_func_full(listener, 194 socket_accept_incoming_migration, 195 NULL, NULL, 196 g_main_context_get_thread_default()); 197 198 for (i = 0; i < listener->nsioc; i++) { 199 SocketAddress *address = 200 qio_channel_socket_get_local_address(listener->sioc[i], errp); 201 if (!address) { 202 return; 203 } 204 migrate_add_address(address); 205 qapi_free_SocketAddress(address); 206 } 207 } 208 209