After installation of OpenSUSE with domU kernel and initrd, the resultant system cannot boot!
Done some searching and seems it is related to grub config file, it can handle xen kernel but it wrote an entry for booting as dom0 mode, not domU mode.
I edited the entry and then it can boot successfully... in text mode, the reason is that SuSE's kernel has no xen framebuffer support, so it can only run serial console.
I copied the RHEL5 kernel to the SuSE filesystem and now it can boot into graphical mode!
Tried live migration and it works too, very good POC.
