Xen devel - Aug 2010 - Which ring the dom0 run at?

I want to set CR0 in a module.  It is ok on linux kernel 2.6.18-164_x86_64
(kernel of rhel 5.4). But if the kernel is 2.6.18-164xen_x86_64, the system
reboot when set CR0.  I think maybe because the ring of  dom0 is not ring0.

Thanks.


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