To follow up, I wasted Avi's time. The "Error (22, Invalid argument)" was caused by an attempt to boot a PAE enabled guest. Without PAE, xend loads and runs the domain, which promptly crashes. So I downloaded the actual Beehive-built binary for 2.6.15-1.2054_FC5xenU and it doesn't boot either. The guest crashes in cpu_gdt_init, same place where my own build does. It simply is a duff kernel and there was nothing wrong with my build procedure. The last working kernel that I know is 2.6.15-1.1955_FC5guest. I'm going to bisect this and find out the problem, or file a bug for DaveJ to look. Greetings, -- Pete -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list