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