linux-kernel - Re: [PATCH v2 1/2] x86/retpoline: Simplify vmexit_fill

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Date:   Fri, 26 Jan 2018 23:20:39 -0500
From:   Konrad Rzeszutek Wilk <konrad@...nok.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     David Woodhouse <dwmw2@...radead.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        tim.c.chen@...ux.intel.com, pjt@...gle.com, jikos@...nel.org,
        gregkh@...ux-foundation.org, dave.hansen@...el.com,
        riel@...hat.com, luto@...capital.net,
        torvalds@...ux-foundation.org, ak@...ux.intel.com,
        keescook@...gle.com, peterz@...radead.org
Subject: Re: [PATCH v2 1/2] x86/retpoline: Simplify vmexit_fill_RSB()

> + * Google experimented with loop-unrolling and this turned out to be
> + * the optimal version — two calls, each with their own speculation
> + * trap should their return address end up getting used, in a loop.
> + */
> +.macro BOINK_RSB nr:req sp:req


BOINK?

Really?