xen: deal with virtually mapped percpu data

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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>

...

This commit is contained in:

Jeremy Fitzhardinge 2009-02-27 09:19:26 -08:00 • committed by Ingo Molnar

parent d0c4f57027

commit 9976b39b50

4 changed files with 19 additions and 5 deletions

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1

arch/x86/include/asm/xen/page.h

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10

arch/x86/xen/enlighten.c

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7

arch/x86/xen/mmu.c

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8

arch/x86/xen/smp.c

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