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SubjectRe: [PATCH 1/3] x86/xen: Avoid fast syscall path for Xen PV guests
On Wed, Nov 18, 2015 at 12:21:56PM -0800, Andy Lutomirski wrote:
> > diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> > index e4f8010..0e4fe5b 100644
> > --- a/arch/x86/include/asm/cpufeature.h
> > +++ b/arch/x86/include/asm/cpufeature.h
> > @@ -216,6 +216,7 @@
> > #define X86_FEATURE_PAUSEFILTER ( 8*32+13) /* AMD filtered pause intercept */
> > #define X86_FEATURE_PFTHRESHOLD ( 8*32+14) /* AMD pause filter threshold */
> > #define X86_FEATURE_VMMCALL ( 8*32+15) /* Prefer vmmcall to vmcall */
> > +#define X86_FEATURE_XENPV ( 8*32+16) /* Xen paravirtual guest */
> >
>
> This bit is highly magical and I think we need Borislav's ack.

Yeah, that should be

#define X86_FEATURE_XENPV ( 8*32+16) /* "" Xen paravirtual guest */
^^

note the empty "". This prevents it from appearing in /proc/cpuinfo.

--
Regards/Gruss,
Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--


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