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