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Message-ID: <1516992318.30244.271.camel@infradead.org>
Subject: Re: [PATCH] x86/cpufeatures: Cleanup AMD speculation feature bits
From:   David Woodhouse <dwmw2@infradead.org>
To:     Borislav Petkov <bp@alien8.de>, x86-ml <x86@kernel.org>
Cc:     linux-tip-commits@vger.kernel.org, hpa@zytor.com,
        gregkh@linuxfoundation.org, tglx@linutronix.de,
        thomas.lendacky@amd.com, linux-kernel@vger.kernel.org,
        mingo@kernel.org
In-Reply-To: <20180126184139.rcfbtk7dvj7kmyfn@pd.tnic>
References: <1516896855-7642-4-git-send-email-dwmw@amazon.co.uk>
         <tip-5d10cbc91d9eb5537998b65608441b592eec65e7@git.kernel.org>
         <20180126184139.rcfbtk7dvj7kmyfn@pd.tnic>
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Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-0QDbjbRs5EMfX88iWq87"
Date:   Fri, 26 Jan 2018 18:45:18 +0000
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On Fri, 2018-01-26 at 19:41 +0100, Borislav Petkov wrote:
> +#define X86_FEATURE_AMD_IBPB=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0(13*32+12) /* "" Indirect Branch Prediction Barrier=
 MSR */

Stray quotes.

> +#define X86_FEATURE_IBRS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(13*32+14) /* Indirect Branch Res=
tricted Speculation */

Please don't call it that. Call it X86_FEATURE_AMD_IBRS and leave
X86_FEATURE_IBRS to parallel X86_FEATURE_IBPB as the *software* bit
which is vendor-independent.

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