"Progress in the virtualisation world sometimes seems slow. Xen
has been the hot topic in the para-virtualisation area for some
years now--the first 'stable' release was announced in 2003--but
the code remains outside of the mainline Linux kernel. News from
that project has been relatively scarce as of late, though the Xen
hackers are certainly still out there working on the code.
"On the other hand, KVM appears to be on the fast path..."