The second Linux kernel release of 2007 is now available, further extending the virtualization and real-time capabilities of Linux.
Highlighting the Linux 2.6.21 update is the inclusion of the paravirt-ops paravirtualization interface, which enables multiple hypervisors to hook directly into Linux.
Though paravirt-ops is just now landing in the 2.6.21 kernel, it was actually backported by Ubuntu in the recent Feisty Fawn release. Other distros, including Red Hat's Fedora, are expected to rebase to the 2.6.21 kernel in the coming weeks.
http://www.internetnews.com/dev-news...le.php/3674346