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~ $ LIBVIRT_DEBUG=1 virsh start winxp
Connecting to uri: qemu:///system
23:38:46.782: debug : virInitialize:287 : register drivers
23:38:46.782: debug : virRegisterDriver:660 : registering Test as driver 0
23:38:46.782: debug : virRegisterNetworkDriver:560 : registering Test as network driver 0
23:38:46.782: debug : virRegisterStorageDriver:591 : registering Test as storage driver 0
23:38:46.782: debug : virRegisterDeviceMonitor:622 : registering Test as device driver 0
23:38:46.782: debug : virRegisterDriver:660 : registering Xen as driver 1
23:38:46.782: debug : virRegisterDriver:660 : registering OPENVZ as driver 2
23:38:46.782: debug : virRegisterDriver:660 : registering remote as driver 3
23:38:46.782: debug : virRegisterNetworkDriver:560 : registering remote as network driver 1
23:38:46.782: debug : virRegisterStorageDriver:591 : registering remote as storage driver 1
23:38:46.782: debug : virRegisterDeviceMonitor:622 : registering remote as device driver 1
23:38:46.782: debug : virConnectOpenAuth:1089 : name=qemu:///system, auth=0x7fe2def5b7e0, flags=0
23:38:46.782: debug : do_open:909 : name "qemu:///system" to URI components:
  scheme qemu
  opaque (null)
  authority (null)
  server (null)
  user (null)
  port 0
  path /system

23:38:46.783: debug : do_open:919 : trying driver 0 (Test) ...
23:38:46.783: debug : do_open:925 : driver 0 Test returned DECLINED
23:38:46.783: debug : do_open:919 : trying driver 1 (Xen) ...
23:38:46.783: debug : do_open:925 : driver 1 Xen returned DECLINED
23:38:46.783: debug : do_open:919 : trying driver 2 (OPENVZ) ...
23:38:46.783: debug : do_open:925 : driver 2 OPENVZ returned DECLINED
23:38:46.783: debug : do_open:919 : trying driver 3 (remote) ...
23:38:46.783: debug : remoteOpen:969 : Auto-remote UNIX socket
23:38:46.783: debug : doRemoteOpen:511 : proceeding with name = qemu:///system
23:38:46.783: debug : call:6462 : Doing call 66 (nil)
23:38:46.783: debug : call:6532 : We have the buck 66 0x7fe2defc4010 0x7fe2defc4010