tree 3f2c190e24540898aed0f2dc330b29062602b67f
parent d0c4f570276cb4d2dc4215b90eb7cb6e2bdd4a15
author Jeremy Fitzhardinge <jeremy@goop.org> 1235755166 -0800
committer Ingo Molnar <mingo@elte.hu> 1235995099 +0100

xen: deal with virtually mapped percpu data

The virtually mapped percpu space causes us two problems:

 - for hypercalls which take an mfn, we need to do a full pagetable
   walk to convert the percpu va into an mfn, and

 - when a hypercall requires a page to be mapped RO via all its aliases,
   we need to make sure its RO in both the percpu mapping and in the
   linear mapping

This primarily affects the gdt and the vcpu info structure.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <htejun@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>