xen: implement Xen write_msr operation

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64-bit uses MSRs for important things like the base for fs and
gs-prefixed addresses.  It's more efficient to use a hypercall to
update these, rather than go via the trap and emulate path.

Other MSR writes are just passed through; in an unprivileged domain
they do nothing, but it might be useful later.

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 15:07:16 -07:00 • committed by Ingo Molnar

parent bf18bf94dc

commit 1153968a48

1 changed files with 30 additions and 1 deletions

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arch/x86/xen/enlighten.c

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