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 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