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Date: Tue, 9 Jan 2018 17:57:11 -0800
From: Andi Kleen <andi@firstfloor.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Dave Hansen <dave.hansen@intel.com>,
        Jiri Kosina <jikos@kernel.org>, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH] x86/retpoline: Fix NOSPEC_JMP for tip
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On Wed, Jan 10, 2018 at 02:50:12AM +0100, Thomas Gleixner wrote:
> On Tue, 9 Jan 2018, Andi Kleen wrote:
> 
> > > > I think there are areas that rely on X86_FEATURE_RETPOLINE being set
> > > > even if X86_FEATURE_RETPOLINE_AMD is set.  For example, line 261 in
> > > > arch/x86/entry/entry_32.S is only checking for X86_FEATURE_RETPOLINE.
> > > 
> > > I audited the difference places. They all seem ok.
> > 
> > Actually 32bit is not ok. For 32bit we need COMMON. So adding it.
> 
> Please keep the current X86_FEATURE_RETPOLINE as the common one and add a
> new X86_FEATURE_RETPOLINE_GENERIC which is selected by the generic/intel
> side. Little more churn, but clearer.

Ok, I just sent v2 without that. Will do a v3.

-Andi