qemu-ubuntu

qemu-system-x86_64 -enable-kvm -cpu host -smp 1 -m 1G \
 -drive file=vm3-Olinux-asterisk.raw,if=none,id=drive0,cache=none,aio=native,format=raw \
 -device virtio-blk-pci,drive=drive0,scsi=off,config-wce=off,x-data-plane=on \
 -net tap,vhost=on,ifname=tap3,script=no,downscript=no \
 -net nic,model=virtio,macaddr=DE:AD:BE:EF:4A:30 -daemonize

[http://wiki.gentoo.org/wiki/QEMU/Options]