libvirt users - May 2010 - weird "no supported architecture for os type 'hvm'"

Hi,

I have two identical machines with exactly the same CentOS 5.4 kickstarted
from the same sources, and the same packages installed. Their cpuinfos are
identical, and they are running libvirt 0.6.3 with the very same
libvirtd.conf.

Yet...

One of them works fine, the other says "no supported architecture for os
type 'hvm'" for the same template (attached) and image.

Any thoughts on what kind of defect or misconfiguration could cause this?

Thanks much!

--Claude

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Yay, problem self-solved!
> 
> I have two identical machines with exactly the same CentOS 5.4 kickstarted
> from the same sources, and the same packages installed. Their cpuinfos are
> identical, and they are running libvirt 0.6.3 with the very same
> libvirtd.conf.
> 
Turns out permissions on /dev/kvm have to be root:kvm, not root:root.
For some reason this automagically happened on one install but not the
other.  Any idea why?

Ah well.

--Claude