linux-kernel - Re: [RFC PATCH 0/5] x86: dynamic indirect call promotion

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Message-ID: <20181129043631.nt2jzxz2hhttdcgi@treble>
Date:   Wed, 28 Nov 2018 22:36:31 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Nadav Amit <namit@...are.com>, Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: Re: [RFC PATCH 0/5] x86: dynamic indirect call promotion

On Wed, Nov 28, 2018 at 07:24:08PM -0800, Andy Lutomirski wrote:
> To be clear, that wasn’t a NAK.  It was merely a “this is alarming.”
> 
> Hey Josh - you could potentially do the same hack to generate the
> static call tables. Take that, objtool.

Ha, after witnessing Nadav's glorious hack, I considered that.  But I
didn't see a way to pull it off, because asm macro conditionals don't
seem to have a way to test for a regex (or at least a named prefix) for
the call target.

I'd need a way to detect "call __static_call_tramp_<whatever>".

-- 
Josh