KVM is a Kernel-based Virtual Machine driver. It relies on Intel VT or AMD-V hardware and does full virtualization. As of late 2006 it is pretty new code, but it is already available in kernel packages for OpenSuSE, Debian and RHEL-RT.

More information on KVM can be found on http://kvm.qumranet.com/

Some [wiki:KVM/Performance performance numbers] with KVM.