command line

qemu-kvm \
 -name hostname \
 -M pc \
 -m 512 \
 -smp 1 \
 -boot c \
 -drive file=/path/to/device/or/image \
 -net nic,macaddr=00:11:22:33:44:55,vlan=0 \
 -net tap,vlan=0,ifname=vnet0 \
 -incoming tcp:0:4444