linux-kernel - [RFC][PATCH 0/2] x86/retpoline: Retpoline on a diet

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Message-ID: <20210218165938.213678824@infradead.org>
Date:   Thu, 18 Feb 2021 17:59:38 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, tony.luck@...el.com, pjt@...gle.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        r.marek@...embler.cz, jpoimboe@...hat.com, jikos@...nel.org
Subject: [RFC][PATCH 0/2] x86/retpoline: Retpoline on a diet

Hi!

The first patch rearranges the implementation and consolidates unused bytes.
The second patch uses INT3 over LFENCE to shrink the retpoline to 15 bytes, by
which 4 can live in a cacheline.

Patches have been boot tested on my IVB.