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Subject: Re: [RFC PATCH 02/10] KVM: PPC: BOOK3S: PR: Emulate virtual
 timebase register
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Alexander Graf <agraf@suse.de>
Date: Thu, 30 Jan 2014 09:54:41 +1100
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Cc: linuxppc-dev@lists.ozlabs.org, paulus@samba.org,
 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, kvm-ppc@vger.kernel.org,
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On Wed, 2014-01-29 at 17:39 +0100, Alexander Graf wrote:
> static inline mfvtb(unsigned long)
> {
> #ifdef CONFIG_PPC_BOOK3S_64
>      return mfspr(SPRN_VTB);
> #else
>      BUG();
> #endif
> }
> 
> is a lot easier to read and get right. But reg.h is Ben's call.

Agreed.

> Also could you please give me a pointer to the specification for it? I 
> tried to look up vtb in the 2.06 ISA and couldn't find it. Is it a CPU 
> specific register?