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

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Date:   Wed, 10 Jan 2018 02:05:16 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        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

On Tue, 9 Jan 2018, Andi Kleen wrote:

> > 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.

I'd appreciate a patch as I'm almost falling asleep. Can you please have a
look at the usage sites of the feature bits as well?

Thanks,

	tglx