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