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    SubjectRe: [PATCH v5 2/2] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
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    On 09/11/2018 04:16 PM, Thomas Gleixner wrote:
    > On Tue, 11 Sep 2018, Tim Chen wrote:
    >> On 09/10/2018 04:46 AM, Jiri Kosina wrote:
    >>> Nah, IBPB is actuall there, sorry. So I'll add reporting of STIBP + fixup
    >>> the missing reporting of RSB_CTXSW for v6.
    >>>
    >>
    >> I anticipate that STIBP could affect workloads with a lot of indirect
    >> branches (see previous discussion with Andrea). We should have a
    >> knob for people to opt in or opt out of STIBP.
    >
    > Feel free to send a patch to that effect.

    Tim, are you planning on sending a patch for this? If so, what type of
    opt in/out are you thinking about, something similar to SSBD?

    Thanks,
    Tom

    >
    > Thanks,
    >
    > tglx
    >

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