Xen lets KVM overtake

“The Xen developers were only able to reach a small part of that
goal when Xen guest support was included in Linux 2.6.23. But they
have finally achieved it: expected next month, Linux 3.0 includes
all of the important kernel components needed to set up a Dom0
operating system, which, together with the Xen hypervisor, will
host guest systems. And that’s not all — since
mid-May, the developer branch of Qemu also contains everything
needed to support Xen guest systems which run by using the
virtualisation capabilities of modern processors
(HVM/hardware-assisted virtualisation).”

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