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19.2. Installing Xen, Configuring and Using Xen

Xen must be installed on the host OS and the host OS must be booted into the Hypervisor Kernel. Fedora Core 5 includes an installation program for the guest OS that will use an existing installation tree of a paravirtualized-enabled OS to access that OS's existing installation program. Currently, Fedora Core 5 is the only available paravirtualized-enabled guest OS. Other OSs can be installed using existing images, but not through the OS's native installation program.
Full instructions can be found here:

No PowerPC Support

Xen is not supported on the PowerPC architecture in Fedora Core 5.