linux-kernel - Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

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Message-ID: <20190108185751.GB1900@hirez.programming.kicks-ass.net>
Date:   Tue, 8 Jan 2019 19:57:51 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Nadav Amit <nadav.amit@...il.com>, X86 ML <x86@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        songliubraving@...com
Subject: Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

On Tue, Jan 08, 2019 at 09:27:21AM -0800, Andi Kleen wrote:
> It doesn't work when the code is modified in place, like the
> patch in the $SUBJECT.

For in-place modification a-la jump_label / static_call etc. we can
'trivially' log the new instruction and the decoder can do matching
in-place kcore adjustments.