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

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Message-ID: <f13f81da-287d-8141-40c6-025c2e5cb28a@redhat.com>
Date:   Fri, 5 Jan 2018 12:32:13 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw2@...radead.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>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7] IBRS patch series

On 04/01/2018 22:22, Van De Ven, Arjan wrote:
> this is about a level of paranoia you are comfortable with.
> 
> Retpoline on Skylake raises the bar for the issue enormously, but
> there are a set of corner cases that exist and that are not trivial
> to prove you dealt with them.
> 
> personally I am comfortable with retpoline on Skylake, but I would
> like to have IBRS as an opt in for the paranoid.
> 

IBRS actually seems to perform more than decently on Skylake with the
microcode updates we're shipping in RHEL---much more so than Broadwell
or Haswell.  Can you confirm that this is expected?

Paolo