qemu: qemu (a generic and open source machine emulator and virtualizer)
qemu: 
qemu: When used as a machine emulator, QEMU can run OSes and programs made
qemu: for one machine (e.g. an ARM board) on a different machine (e.g. your
qemu: own PC). By using dynamic translation, it achieves very good
qemu: performances.
qemu: When used as a virtualizer, QEMU achieves near native performances by
qemu: executing the guest code directly on the host CPU. A host driver
qemu: called the QEMU accelerator (also known as KQEMU) is needed in this
qemu: case. The virtualizer mode requires that both the host and guest
qemu: machine use x86 compatible processors.