If you are using libvirt
create /etc/libvirt/qemu/kvm-32 
-------------------snip-----------
#!/bin/bash
exec kvm -cpu qemu32,-nx `echo $*`
---------------end-----------------
use qemu64 for 64bit.

Then modify domains to use the wrapper script
virsh edit <domain>
change emulator in device section to:
<emulator>/etc/libvirt/qemu/kvm-32</emulator>

It may be a good idea to ship with a wrapper and a config file to pass extra 
options to kvm
from libvirt, since it's not easy to pass them now.

-- 
kvm guests hang after startup
https://bugs.launchpad.net/bugs/396219
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