linux-kernel - Re: [PATCH v1 1/2] x86/cpufeature: Add AVX512

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Message-ID: <20170116172348.e67p3c6fvyepsq5r@pd.tnic>
Date:   Mon, 16 Jan 2017 18:23:48 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Piotr Luc <piotr.luc@...el.com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] x86/cpufeature: Add AVX512_VPOPCNTDQ feature

On Tue, Jan 10, 2017 at 06:34:02PM +0100, Piotr Luc wrote:
> Vector population count instructions for dwords and qwords are to be
> used in future Intel Xeon & Xeon Phi processors. The bit 14 of
> CPUID[level:0x07, ECX] indicates that the new instructions are
> supported by a processor.
> 
> The spec can be found in the Intel Software Developer Manual (SDM)
> or in the Instruction Set Extensions Programming Reference (ISE).
> 
> Define new feature flag to enumerate the new instructions set in
> /proc/cpuinfo according to new CPUID bit.
> Clear the feature bit in case xsave is disabled.
> 
> Signed-off-by: Piotr Luc <piotr.luc@...el.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> ---

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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