You can customize your virtualization environment by editing the /boot/grub/menu.lst file.
If the Xen option does not appear on the GRUB boot menu, you can compare your updated GRUB boot loader file with the examples below to confirm that it was updated correctly.
The first example shows a typical GRUB boot loader file updated to load the kernel that supports virtualization software. The second example shows a GRUB boot loader file that loads the PAE-enabled virtualization kernel.
title XEN
root (hd0,5)
kernel /boot/xen.gz hyper_parameters
module /boot/vmlinuz-xen kernel_parameters
module /boot/initrd-xen
title XEN
root (hd0,5)
kernel /boot/xen-pae.gz hyper_parameters
module /boot/vmlinuz-xenpae kernel_parameters
module /boot/initrd-xenpae
The title line defines sections in the boot loader file. Do not change this line, because YaST looks for the word to verify that packages are installed.
The root line specifies which partition holds the boot partition and /boot directory. Replace ( hd0,5) with the correct partition. For example, if the drive designated as hda1 holds the /boot directory, the entry would be ( hd0,0).
The kernel line specifies the directory and filename of the hypervisor. Replace hyper_parameters with the parameters to pass to the hypervisor. A common parameter is dom0_mem= amount_of_memory , which specifies how much memory to allocate to the host desktop. The amount of memory is specified in KB, or you can specify the units with a K, M, or G suffix, for example 128M. If the amount is not specified, the host desktop takes the maximum possible memory for its operations.
For more information about hypervisor parameters, see Section 1.12, Xen Boot Parameters.
The first module line specifies the directory and filename of the Linux kernel to load. Replace kernel_parameters with the parameters to pass to the kernel. These parameters are the same parameters as those that can be passed to a standard Linux kernel on physical computer hardware.
The second module line specifies the directory and filename of the RAM disk used to boot the virtual machine host.
To set the GRUB boot loader to automatically boot the Xen virtualization software, change the default entry from 0 (zero), which means the first title entry, to the number that corresponds to the title XEN entry. In the example file, Xen is the second title line, so to specify it, you would change the value of default from 0 to 1.