migration/socket.c

   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