Re: [RFC PATCH 06/10] KVM: PPC: Book3S HV: Implement architecture compatibility modes for POWER8

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On Mon, Nov 04, 2013 at 01:53:36PM +0100, Alexander Graf wrote:
> 
> On 06.09.2013, at 05:55, Paul Mackerras <paulus@xxxxxxxxx> wrote:
> 
> > This allows us to select architecture 2.05 (POWER6) or 2.06 (POWER7)
> > compatibility modes on a POWER8 processor.
> > 
> > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>
> > ---
> > arch/powerpc/include/asm/reg.h |  2 ++
> > arch/powerpc/kvm/book3s_hv.c   | 16 +++++++++++++++-
> > 2 files changed, 17 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
> > index 4ca8b85..483e0a2 100644
> > --- a/arch/powerpc/include/asm/reg.h
> > +++ b/arch/powerpc/include/asm/reg.h
> > @@ -315,6 +315,8 @@
> > #define SPRN_PCR	0x152	/* Processor compatibility register */
> > #define   PCR_VEC_DIS	(1ul << (63-0))	/* Vec. disable (pre POWER8) */
> > #define   PCR_VSX_DIS	(1ul << (63-1))	/* VSX disable (pre POWER8) */
> > +#define   PCR_TM_DIS	(1ul << (63-2))	/* Trans. memory disable (POWER8) */
> 
> Is this going to get used?

Perhaps not, but I thought it worthwhile to document that the bit
exists.

Paul.
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