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

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Message-ID: <20180110005113.h7ya6fl6shccvzew@two.firstfloor.org>
Date:   Tue, 9 Jan 2018 16:51:14 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andi Kleen <andi@...stfloor.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        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

> Then just make sure X86_FEATURE_RETPOLINE_AMD disables X86_FEATURE_RETPOLINE.
> 
> That is both simpler an dsmaller, no?

Yes that works, and is clearly better/simpler.

Tested-by: Andi Kleen <ak@...ux.intel.com>

Thomas, I assume you will fix it up, or let me know if I should
send another patch.

-Andi