Booting Xen

From grub.conf:

title Fedora Core Xen (2.6.11-1.1369_FC4xen0)
        root (hd0,0)
	kernel /boot/xen.gz
	module /boot/vmlinuz-2.6.11-1.1369_FC4xen0 ro root=LABEL=/12 rhgb quiet selinux=0
	module /boot/initrd-2.6.11-1.1369_FC4xen0.img

Xen runs in ring 0 (approx 32MB)

Linux runs in ring 2/3