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

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Message-ID: <CA+55aFx+5dUyKRjXEavnxzfXbiQnrmiSCw3PgPtSb+6OP-Qhcg@mail.gmail.com>
Date:   Thu, 4 Jan 2018 11:00:14 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     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 Thu, Jan 4, 2018 at 9:56 AM, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
>
> Speculation on Skylake and later requires these patches ("dynamic IBRS")
> be used instead of retpoline[1].

Can somebody explain this part?

I was assuming that retpoline would work around this issue on all uarchs.

This seems to say "retpoline does nothing on Skylake+"

              Linus