Messages in this thread | | | Date | Wed, 21 Nov 2018 19:21:31 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [PATCH 4.19 041/361] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation |
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On Wed, 21 Nov 2018, Tim Chen wrote:
> > Is it reverted in Linus's tree? If not, then anything that comes "later > > on" will not apply here, right? > > > > I see the thread asking about this, but I got really conflicting > > messages here, and now it's in all of the latest releases, and no > > testing seems to have uncovered issues. Is it just a "slow down" > > problem? > > Greg, > > It could be a big slow down in excess of 20% for some applications. > And cross sibling Spectre v2 attack is quite hard to pull off. > > So till we have the accompanying patchset that only apply STIBP on processes > that really need it instead of universally, it should be withheld from > stable.
Agreed; it will be trivially reintroduced with the rest, once it's ready. It's being built on top of that patch.
Thanks,
-- Jiri Kosina SUSE Labs
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