linux-kernel - Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512

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Date:   Sat, 29 Oct 2016 09:20:08 -0400 (EDT)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Piotr Luc <Piotr.Luc@...el.com>, kvm@...r.kernel.org,
        he chen <he.chen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org,
        hpa@...or.com, mingo@...hat.com, Luwei Kang <luwei.kang@...el.com>,
        rkrcmar@...hat.com
Subject: Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS
 features to kvm guest



----- Original Message -----
> From: "Borislav Petkov" <bp@...en8.de>
> To: "Paolo Bonzini" <pbonzini@...hat.com>
> Cc: "Piotr Luc" <Piotr.Luc@...el.com>, kvm@...r.kernel.org, "he chen" <he.chen@...ux.intel.com>,
> linux-kernel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org, hpa@...or.com, mingo@...hat.com, "Luwei Kang"
> <luwei.kang@...el.com>, rkrcmar@...hat.com
> Sent: Saturday, October 29, 2016 2:53:10 PM
> Subject: Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest
> 
> On Sat, Oct 29, 2016 at 08:36:11AM -0400, Paolo Bonzini wrote:
> > Because then it wouldn't be in processor.h.
> 
> Easy:
> 
> 	return cpuid_edx(…) & KVM_CPUID_EDX_7_MASK;
> 
> at the call site.

Yup.  That's what I said before (entry->edx &= cpuid_count_edx(7, 0)).

Paolo