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

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Message-ID: <1320680757.17809.2.camel@twins>
Date:	Mon, 07 Nov 2011 16:45:57 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Gleb Natapov <gleb@...hat.com>
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, 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;
        

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