On Fri, Jul 19, 2013 at 6:18 AM, Vishvendra Singh Chauhan wrote: As soon as you have nested virtualization enabled I think it is a more a matter of running Xen inside KVM. And results could also depend on your cpu (Intel vs Amd) So you had better to first ask in kvm mailing list and/or xen mailing list. For example see this thread of mid December 2012 with 2 problems detailed: http://comments.gmane.org/gmane.comp.emulators.kvm.devel/96009 You can try search and post there as a starting point. And when ad if you solve it should be possibly easy to make the same inside oVirt infra that leverages KVM functionalities. Also important this thread dated May 2013 http://www.mail-archive.com/kvm@vger.kernel.org/msg90635.html that leads to this: " So far, I think it's NO. VMX doesn't work, but PV guest can work in L1 Xen. There's a bug tracking 'Xen on KVM' issue. https://bugzilla.kernel.org/show_bug.cgi?id=45931 " Gianluca