linux-kernel - Re: [PATCH 2/4] x86/cpufeatures: Add AMD feature bits for Prediction Command

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Message-ID: <20180121175129.mfyafhlbbgyyogmc@pd.tnic>
Date:   Sun, 21 Jan 2018 18:51:29 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        David Woodhouse <dwmw@...zon.co.uk>, arjan@...ux.intel.com,
        tglx@...utronix.de, karahmed@...zon.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        peterz@...radead.org, pbonzini@...hat.com, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, gregkh@...ux-foundation.org
Subject: Re: [PATCH 2/4] x86/cpufeatures: Add AMD feature bits for Prediction
 Command

On Sun, Jan 21, 2018 at 11:36:32AM -0600, Tom Lendacky wrote:
> >>> +#define X86_FEATURE_AMD_PRED_CMD	( 7*32+17) /* Prediction Command MSR
> >>> (AMD) */
> 
> You should use the existing 0x80000008 EBX entry for this.

Right, and is the bit called "PredCmd" or so or simply "IBPB" ?

-- 
Regards/Gruss,
    Boris.

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