Quote Originally Posted by Phoronix
February 06, 2007 -- QEMU Accelerator (KQEMU) the previously closed-source kernel module for offering increased performance with QEMU, is now open-source! This new version (version 1.3.0pre10) complies with the GNU GPL license. A detailed technical specification and API description for this virtualization accelerator is also available. QEMU 0.9.0 has also been released today.
http://www.phoronix.com/?page=news_item&px=NDc3Nw

http://fabrice.bellard.free.fr/qemu/index.html