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Xen 3.0 Virtualization User Guide
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2.5.1 GRUB Configuration

An entry should be added to grub.conf (often found under /boot/ or /boot/grub/) to allow Xen / XenLinux to boot. This file is sometimes called menu.lst, depending on your distribution. The entry should look something like the following:

title Xen 3.0 / XenLinux 2.6
  kernel /boot/xen-3.0.gz dom0_mem=262144
  module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0

The kernel line tells GRUB where to find Xen itself and what boot parameters should be passed to it (in this case, setting the domain 0 memory allocation in kilobytes and the settings for the serial port). For more details on the various Xen boot parameters see Section 10.3.

The module line of the configuration describes the location of the XenLinux kernel that Xen should start and the parameters that should be passed to it. These are standard Linux parameters, identifying the root device and specifying it be initially mounted read only and instructing that console output be sent to the screen. Some distributions such as SuSE do not require the ro parameter.

To use an initrd, add another module line to the configuration, like:

  module /boot/my_initrd.gz

When installing a new kernel, it is recommended that you do not delete existing menu options from menu.lst, as you may wish to boot your old Linux kernel in future, particularly if you have problems.

Xen 3.0 Virtualization User Guide
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  Published under the terms of the GNU General Public License Design by Interspire