Unable to boot a Xen guest kernel

[Pete Zaitcev]

For some reason, I cannot boot a Xen guest kernel which I built.
"xm create" ends with:
Error: Error creating domain: (22, 'Invalid argument')

I downloaded a Rawhide kernel rpm (2.6.15-1.2054_FC5), ran rpmbuild -bp,
then took rpms/BUILD/kernel-2.6.15/linux-2.6.15, copied
configs/kernel-2.6.15-i686-xenU-PAE.config, built the kernel
with "make oldconfig && make". The result, apparently, is the
vmlinuz in the root directory.

Does anyone have an idea what I am missing here?

-- Pete