Thsi is very handy when doing your own kernel development.
-m specifies how much ram (in the example it is 768MB)
-kernel specifies the path to the kernel file
-net tap,ifname=tap1,script=no (the ifname=tap1 is what you need to change and setup manually).
*Run "tunctl -b" to create a tap device and use the one it gives you for ifname=
Enable networking to the outside like this:
*Note we assume that your bridge is br0 in this example (you need to setup as a bridge for KVM to have direct network access)
tap=`tap -b`; brctl addif br0 $tap; ifconfig $tap up; /usr/libexec/qemu-kvm -m 768 -kernel /tftpboot/images/kernelfs-3.2.55 -net nic -net tap,ifname=$tap,script=no append "initrd=/initrd/location"
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