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It's very much possible, Devstack will install no problem on a KVM guest. The VM's you start up will be super slow (VM on top of a VM), but it will work.
If you really want to get fancy, you can install all of OpenStack on the KVM guest, except the nova-compute service, then install nova-compute on your hypervisor directly. Once you get that set up properly, your OpenStack VM's will boot along-side your KVM guest running OpenStack, directly on the hypervisor.
