> Yes, we are using Virtio drivers for networking and storage in both VMs
quoted text
> with cache=none. Both VMs are running Linux 2.6.32-bpo.5-amd64 from
> Lenny Backports repositories. For VMHost, we are using a stable version
> of KVM with Linux 2.6.32.12 compiled from source code of kernel.org and
> qemu-kvm 0.12.3 compiled with the source code obtained from the official
> site of KVM.
> 

Afaik this should be this bug
http://sourceforge.net/tracker/?func=detail&atid=893831&aid=2989366&group_id=180599

try upgrading to 0.12.4 or backport this commit
http://git.kernel.org/?p=virt/kvm/qemu-
kvm.git;a=commit;h=012d4869c1eb195e83f159ed7b2bced33f37f960

David
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