Optimized KVM guest startup

Just some braindump:

qemu-system-x86_64 -no-acpi -m 4096 -curses -net nic,model=virtio,vlan=0 \
-net bridge,vlan=0,br=br0 -enable-kvm -smp 4 \
-drive if=scsi,file=cleaned.qcow2 -drive if=scsi,file=/dev/sdb1,index=1