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

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Message-ID: <alpine.DEB.2.20.1801100137540.2200@nanos>
Date:   Wed, 10 Jan 2018 01:39:10 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, dwmw@...zon.co.uk, pjt@...gle.com,
        luto@...nel.org, peterz@...radead.org, thomas.lendacky@....com,
        tim.c.chen@...ux.intel.com, gregkh@...ux-foundation.org,
        dave.hansen@...el.com, 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:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> With the latest tip x86/pti I get oopses when booting
> a 64bit VM in qemu with RETPOLINE/gcc7 and PTI enabled.
> 
> The following patch fixes it for me. Something doesn't
> seem to work with ALTERNATIVE_2. It adds only a few bytes
> more code, so seems acceptable.

Can you please figure out what goes wrong. David has tested this with his
compiler and I really don't want to 'fix' this just because some random
compiler version fails to build it.

Thanks,

	tglx