Recently,i'm trying to run xen hypervisor inside kvm .
I found that RHEL6 did not support Nested virtualization.
see this redhat maillist
----- Original Message -----
From: "Gilles Dubreuil"
To: rhos-list redhat com
Sent: Monday, November 25, 2013 9:59:58 PM
Subject: [rhos-list] RHEL6: Nested virtualization support for kvm_intel?
Maybe I'm dreaming but I thought soon we'll able to go Inception level
3, well at least that's how I explain to my partner what we're doing.
I'm not sure if any previous OpenStack kernels did have the feature.
But latest RHEL6.5 kernel seems not to support nested virtualization on
kvm_intel kernel module.
I'm not 100% sure if CPU support is required besides normal vmx flag.
But I can't see any flag advertising such feature or not while comparing
Intel specs as well with my laptop where it works with Fedora.
If there is no specific CPU support needed then the blocker will be the
module. In such case, do there is any road map for the feature?
Didn't find much rhel6 support for it (google/BZ) either.
Not until RHEL 7, however it does work (but not supported) on AMD hardware.
But centos6 support. see howto