linux-kernel - Re: [PATCH v9 4/5] x86/xsave: Make XSAVE check the base CPUID features before enabling

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Message-ID: <alpine.DEB.2.20.1710081034140.1922@nanos>
Date:   Sun, 8 Oct 2017 10:34:25 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v9 4/5] x86/xsave: Make XSAVE check the base CPUID features
 before enabling

On Fri, 6 Oct 2017, Andi Kleen wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Before enabling XSAVE, not only check the XSAVE specific CPUID bits,
> but also the base CPUID features of the respective XSAVE feature.
> This allows to disable individual XSAVE states using the existing
> clearcpuid= option, which can be useful for performance testing
> and debugging, and also in general avoids inconsistencies.
> 
> v2:
> Add curly brackets (Thomas Gleixner)
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>