Hi,

I've got a question about the emulation of cpl=0 of a PV-domain. Currently cpl=0 is emulated by using privilege level 2. Is there any special reason not to use privilege level 1?

The reason for my question is the port of our mainframe operating system to xen/ia64. We are using three different privilege levels today and it would make the port much easier if we could keep this approach. This is only possible, if cpl=0 of the domU is mapped to privilege level 1 by the hypervisor, of course.

If there is no architectural reason for using cpl=2 instead cpl=1, I would prepare some patches...

Juergen