Per guest description file in /etc/xen/
kernel="/boot/vmlinuz-2.6.12-1.1454_FC4xenU"
memory=128
name="fc4"
nics = 1
disk = ['file:/u/fc4.img,sda1,w']
root = "/dev/sda1"
extra = "ro selinux=0 3"
Reduce the Xen0 memory, launch and check:
xm mem-set 0 512
xm create fc4
xm list
