hbz
hbz Central IT hosts virtualization clusters on Citrix Xen Server 6.1.0 .
Supported (preferred) operating systems are SLES12, SLES11 and Windows Server 2012 + 2003.
Server folio-dev with SLES12.3
Virtualbox doens't run in a Xen environment 
folio-dev:/home/kuss # /sbin/vboxconfig
vboxdrv.sh: Stopping VirtualBox services.
vboxdrv.sh: Building VirtualBox kernel modules.
vboxdrv.sh: Starting VirtualBox services.
vboxdrv.sh: failed: Running VirtualBox in a Xen environment is not supported.