Hi, When I use -kernel-kqemu option, it crash the guest machine's kernel. The command is, qemu-system-x86_64 -kernel-kqemu -k en-gb -m 400M -net nic, -net tap foobar.img The log can be found in attachment. System Information, qemu-0.8.2 kqemu-1.3.0pre9 linux-2.6.16 (host) Ubuntu edgy x86_64 linux-2.6.12-9-amd64-generic (guest) Qian