Updated signed GPLPV drivers are available to download in our Wiki. These support Microsoft Windows 8 and Windows Server 2012 as of now and increase the performance of virtualised Windows systems within the hypervisor solution Xen, which is integrated in UCS.
Further details can be found in the Univention Wiki at:
http://wiki.univention.de/index.php?title=Installing-signed-GPLPV-drivers