linux-kernel - Re: [PATCH 0/7] IBRS patch series

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Date:   Fri, 05 Jan 2018 11:05:49 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Florian Weimer <fw@...eb.enyo.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7] IBRS patch series

On Fri, 2018-01-05 at 06:25 +0100, Florian Weimer wrote:
> 
> Retpoline also looks incompatible with CET, so future Intel CPUs will
> eventually need a different approach anyway.

CPUs with CET will have the indirect branch problem fixed, so the
retpoline ALTERNATIVE will be used which is a bare 'jmp *%reg'.

That's why we switched the ABI for the retpoline from having the target
address on the stack, to passing it in in a register.

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