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