xen64: add pvop for swapgs

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swapgs is a no-op under Xen, because the hypervisor makes sure the
right version of %gs is current when switching between user and kernel
modes.  This means that the swapgs "implementation" can be inlined and
used when the stack is unsafe (usermode).  Unfortunately, it means
that disabling patching will result in a non-booting kernel...

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Jeremy Fitzhardinge 2008-07-08 15:07:01 -07:00 • committed by Ingo Molnar

parent 997409d3d0

commit 952d1d7055

1 changed files with 3 additions and 0 deletions

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arch/x86/xen/enlighten.c

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