Date: Wed, 10 Jan 2018 01:39:10 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <andi@firstfloor.org>
cc: x86@kernel.org, linux-kernel@vger.kernel.org,
        torvalds@linux-foundation.org, dwmw@amazon.co.uk, pjt@google.com,
        luto@kernel.org, peterz@infradead.org, thomas.lendacky@amd.com,
        tim.c.chen@linux.intel.com, gregkh@linux-foundation.org,
        dave.hansen@intel.com, jikos@kernel.org,
        Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH] x86/retpoline: Fix NOSPEC_JMP for tip
In-Reply-To: <20180110003139.10531-1-andi@firstfloor.org>
Message-ID: <alpine.DEB.2.20.1801100137540.2200@nanos>
References: <20180110003139.10531-1-andi@firstfloor.org>
User-Agent: Alpine 2.20 (DEB 67 2015-01-07)
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Sender: linux-kernel-owner@vger.kernel.org

On Tue, 9 Jan 2018, Andi Kleen wrote:

> From: Andi Kleen <ak@linux.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