GRUB Configuration
Of course, we've dealt with GRUB in passing because it's one of the basic prerequisites for Xen. However, there are a few more aspects of GRUB that are worth mentioning in depth. A fair number of Xen's behavior knobs can be tweaked in GRUB at boot time by adjusting the command-line parameters passed to the hypervisor.
For example, the already-mentioned dom0_mem parameter adjusts the amount of memory that Xen allows the dom0 to see:
kernel /boot/xen.gz dom0_mem=131072
To keep the system from rebooting if you have a kernel panic, which happens more often than we would like, especially when trying to get machines initially set up, add noreboot to the kernel line:
kernel /boot/xen.gz dom0_mem=131072 noreboot
as well as panic=0 to the ...
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