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