[Qemu-devel] centos 6.3 and nested kvm

[Mike Lovell <mike@dev-zero.net>]

i have been using kvm in an nested environment for a couple months now. 
things have appeared to be working fine. i have used both intel 
(westmere-ep) hosts and, when starting the first level guest, i have 
specified '-cpu qemu64,+vmx' to pass the kvm support through. when using 
a centos 6.2 guest, i am able to load the kvm and kvm_intel modules and 
use it. the problem is today i tried updating my centos 6.2 guest to 6.3 
and now the kvm_intel module fails to load in this guest. there aren't 
any kernel messages that i can see. does anyone on the list have an idea 
of what might have changed. the 6.2 system had 2.6.32-220.el6.x86_64 as 
the kernel version and 6.3 has 2.6.32-279.11.1.el6. the exact error i 
get when trying to load the module is

FATAL: Error inserting kvm_intel 
(/lib/modules/2.6.32-279.11.1.el6.x86_64/kernel/arch/x86/kvm/kvm-intel.ko): 
Input/output error

anyone know of anything that might have changed in the kvm_intel module 
or elsewhere that would cause this to break?

mike