linux-kernel - Re: [PATCH] x86/retpoline: Fix NOSPEC

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Message-ID: <1515575121.22302.76.camel@infradead.org>
Date:   Wed, 10 Jan 2018 09:05:21 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Andi Kleen <andi@...stfloor.org>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Jiri Kosina <jikos@...nel.org>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86/retpoline: Fix NOSPEC_JMP for tip

On Tue, 2018-01-09 at 17:30 -0800, Andi Kleen wrote:
> I assume you don't need FILL_RETURN_BUFFER on AMD. If not let me know
> and we can add a X86_FEATURE_RETPOLINE_COMMON

FWIW the AMD doc I have here (Tom, is that public now?) does say we
should fill the RSB. That's a minor tweak s/GENERIC/COMMON/ in your
latest patch set I think, so I'll fix that up.

Thanks. 
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