[Qemu-devel] centos 6.3 and nested kvm

[Qemu-devel] centos 6.3 and nested kvm

[Mike Lovell]

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

Re: [Qemu-devel] centos 6.3 and nested kvm

[Mike Lovell]

On 10/30/2012 02:02 PM, Mike Lovell wrote:
> 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?

i probably should have specified this before but i'm using qemu 1.1.2 on 
the host.

mike