After the upgrade completes and the server has all patches applied, do the following:
On the desktop, click Computer > YaST.
Click Virtualization > Install Hypervisor and Tools.
Select Xen and click Accept.
If prompted to install packages, click Install.
When prompted to configure a network bridge, click Yes.
When the hypervisor and tools installation is completed, click OK.
Click YaST > Virtualization > VirtualMachineManager.
Click File > Add Connection > Connect.
Your VM guests are now able to be run.