linux-kernel - Re: [PATCHv2 7/9] KVM: Expose the architectural performance monitoring CPUID leaf

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Message-ID: <20111107155453.GJ8670@redhat.com>
Date:	Mon, 7 Nov 2011 17:54:53 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	kvm@...r.kernel.org, avi@...hat.com, mtosatti@...hat.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	acme@...stprotocols.net
Subject: Re: [PATCHv2 7/9] KVM: Expose the architectural performance
 monitoring CPUID leaf

On Mon, Nov 07, 2011 at 04:45:57PM +0100, Peter Zijlstra wrote:
> On Mon, 2011-11-07 at 17:41 +0200, Gleb Natapov wrote:
> > > > +               entry->eax = min(cap.version, 2)
> > > > +                       | (cap.num_counters_gp << 8)
> > > > +                       | (cap.bit_width_gp << 16)
> > > > +                       | (cap.events_mask_len << 24); 
> 
> 
> > Do you mean by doing cpuid here directly instead of checking perf
> > capability?
> 
> No I meant something like:
>         
>         union cpuid10_eax eax;
>         
>         eax.version	 = min(cap.version, 2);
>         eax.bit_width	 = cap.bit_width;
>         eax.num_counters = cap.num_counters;
>         eax.mask_length	 = cap.mask_length;
>         
>         entry->eax = eax.full;
>         
Ah, yes. Will do that.

--
			Gleb.
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