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
  32 struct SocketOutgoingArgs {
  33     SocketAddress *saddr;
  34 } outgoing_args;
  35
  36 void socket_send_channel_create(QIOTaskFunc f, void *data)
  37 {
  38     QIOChannelSocket *sioc = qio_channel_socket_new();
  39     qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
  40                                      f, data, NULL, NULL);
  41 }
  42
  43 QIOChannel *socket_send_channel_create_sync(Error **errp)
  44 {
  45     QIOChannelSocket *sioc = qio_channel_socket_new();
  46
  47     if (!outgoing_args.saddr) {
  48         object_unref(OBJECT(sioc));
  49         error_setg(errp, "Initial sock address not set!");
  50         return NULL;
  51     }
  52
  53     if (qio_channel_socket_connect_sync(sioc, outgoing_args.saddr, errp) < 0) {
  54         object_unref(OBJECT(sioc));
  55         return NULL;
  56     }
  57
  58     return QIO_CHANNEL(sioc);
  59 }
  60
  61 int socket_send_channel_destroy(QIOChannel *send)
  62 {
  63     /* Remove channel */
  64     object_unref(OBJECT(send));
  65     if (outgoing_args.saddr) {
  66         qapi_free_SocketAddress(outgoing_args.saddr);
  67         outgoing_args.saddr = NULL;
  68     }
  69     return 0;
  70 }
  71
  72 struct SocketConnectData {
  73     MigrationState *s;
  74     char *hostname;
  75 };
  76
  77 static void socket_connect_data_free(void *opaque)
  78 {
  79     struct SocketConnectData *data = opaque;
  80     if (!data) {
  81         return;
  82     }
  83     g_free(data->hostname);
  84     g_free(data);
  85 }
  86
  87 static void socket_outgoing_migration(QIOTask *task,
  88                                       gpointer opaque)
  89 {
  90     struct SocketConnectData *data = opaque;
  91     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  92     Error *err = NULL;
  93
  94     if (qio_task_propagate_error(task, &err)) {
  95         trace_migration_socket_outgoing_error(error_get_pretty(err));
  96            goto out;
  97     }
  98
  99     trace_migration_socket_outgoing_connected(data->hostname);
 100
 101     if (migrate_zero_copy_send() &&
 102         !qio_channel_has_feature(sioc, QIO_CHANNEL_FEATURE_WRITE_ZERO_COPY)) {
 103         error_setg(&err, "Zero copy send feature not detected in host kernel");
 104     }
 105
 106 out:
 107     migration_channel_connect(data->s, sioc, data->hostname, err);
 108     object_unref(OBJECT(sioc));
 109 }
 110
 111 static void
 112 socket_start_outgoing_migration_internal(MigrationState *s,
 113                                          SocketAddress *saddr,
 114                                          Error **errp)
 115 {
 116     QIOChannelSocket *sioc = qio_channel_socket_new();
 117     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
 118
 119     data->s = s;
 120
 121     /* in case previous migration leaked it */
 122     qapi_free_SocketAddress(outgoing_args.saddr);
 123     outgoing_args.saddr = saddr;
 124
 125     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
 126         data->hostname = g_strdup(saddr->u.inet.host);
 127     }
 128
 129     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 130     qio_channel_socket_connect_async(sioc,
 131                                      saddr,
 132                                      socket_outgoing_migration,
 133                                      data,
 134                                      socket_connect_data_free,
 135                                      NULL);
 136 }
 137
 138 void socket_start_outgoing_migration(MigrationState *s,
 139                                      const char *str,
 140                                      Error **errp)
 141 {
 142     Error *err = NULL;
 143     SocketAddress *saddr = socket_parse(str, &err);
 144     if (!err) {
 145         socket_start_outgoing_migration_internal(s, saddr, &err);
 146     }
 147     error_propagate(errp, err);
 148 }
 149
 150 static void socket_accept_incoming_migration(QIONetListener *listener,
 151                                              QIOChannelSocket *cioc,
 152                                              gpointer opaque)
 153 {
 154     trace_migration_socket_incoming_accepted();
 155
 156     if (migration_has_all_channels()) {
 157         error_report("%s: Extra incoming migration connection; ignoring",
 158                      __func__);
 159         return;
 160     }
 161
 162     qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 163     migration_channel_process_incoming(QIO_CHANNEL(cioc));
 164 }
 165
 166 static void
 167 socket_incoming_migration_end(void *opaque)
 168 {
 169     QIONetListener *listener = opaque;
 170
 171     qio_net_listener_disconnect(listener);
 172     object_unref(OBJECT(listener));
 173 }
 174
 175 static void
 176 socket_start_incoming_migration_internal(SocketAddress *saddr,
 177                                          Error **errp)
 178 {
 179     QIONetListener *listener = qio_net_listener_new();
 180     MigrationIncomingState *mis = migration_incoming_get_current();
 181     size_t i;
 182     int num = 1;
 183
 184     qio_net_listener_set_name(listener, "migration-socket-listener");
 185
 186     if (migrate_multifd()) {
 187         num = migrate_multifd_channels();
 188     } else if (migrate_postcopy_preempt()) {
 189         num = RAM_CHANNEL_MAX;
 190     }
 191
 192     if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
 193         object_unref(OBJECT(listener));
 194         return;
 195     }
 196
 197     mis->transport_data = listener;
 198     mis->transport_cleanup = socket_incoming_migration_end;
 199
 200     qio_net_listener_set_client_func_full(listener,
 201                                           socket_accept_incoming_migration,
 202                                           NULL, NULL,
 203                                           g_main_context_get_thread_default());
 204
 205     for (i = 0; i < listener->nsioc; i++)  {
 206         SocketAddress *address =
 207             qio_channel_socket_get_local_address(listener->sioc[i], errp);
 208         if (!address) {
 209             return;
 210         }
 211         migrate_add_address(address);
 212         qapi_free_SocketAddress(address);
 213     }
 214 }
 215
 216 void socket_start_incoming_migration(const char *str, Error **errp)
 217 {
 218     Error *err = NULL;
 219     SocketAddress *saddr = socket_parse(str, &err);
 220     if (!err) {
 221         socket_start_incoming_migration_internal(saddr, &err);
 222     }
 223     qapi_free_SocketAddress(saddr);
 224     error_propagate(errp, err);
 225 }