linux-kernel - RE: Improve retpoline for Skylake

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Message-ID: <0575AF4FD06DD142AD198903C74E1CC87A5CC692@FMSMSX151.amr.corp.intel.com>
Date:   Mon, 15 Jan 2018 17:56:56 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jon Masters <jcm@...masters.org>
CC:     Henrique de Moraes Holschuh <hmh@....eng.br>,
        Andi Kleen <andi@...stfloor.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pjt@...gle.com" <pjt@...gle.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "gregkh@...ux-foundation.org" <gregkh@...ux-foundation.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>
Subject: RE: Improve retpoline for Skylake

> Having firmware refill the RSB only makes a difference if you are on
> Skylake+ were RSB underflows are bad, and you're not using IBRS to
> protect your indirect predictions.

... and before that you don't need it.