Messages in this thread | | | Date | Tue, 11 Sep 2018 23:46:02 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v5 2/2] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation |
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On Tue, 11 Sep 2018, 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.
Along with a proper explanation why it makes sense to disable this particular piece separate from the rest of the V2 mitigations. You surely can come up with a rationale based on facts rather than on anticipations.
Thanks,
tglx
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