No, those of use with older servers (without vmx/svm processors) are not. The machines work just fine and XEN allows us to paravirtualize several linux machines on each one. Unfortunately RedHat has lost sight of those customers. As far as I'm aware KVM still requires the intel vt/amd-v technologies to create any guests, which XEN only requires for HVM guests (i.e. windows).

He used to be a hilarious DJ on WXDX in Pittsburgh that I listened to in college.
http://en.wikipedia.org/wiki/Alan_Cox_(radio_presenter)

oh wait...