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Re: [Xen-devel] [RESEND] Spectre-v2 (IBPB/IBRS) and SSBD fixes for 4.4.y

On Tue, 24 Jul 2018, Srivatsa S. Bhat wrote:

> However, if you are proposing that you'd like to contribute the enhanced 
> PTI/Spectre (upstream) patches from the SLES 4.4 tree to 4.4 stable, and 
> have them merged instead of this patch series, then I would certainly 
> welcome it!

I'd in principle love us to push everything back to 4.4, but there are a 
few reasons (*) why that's not happening shortly.

Anyway, to point out explicitly what's really needed for those folks 
running 4.4-stable and relying on PTI providing The Real Thing(TM), it's 
either a 4.4-stable port of


or making THREADINFO_GFP imply __GFP_ZERO.

(*) IBRS is not upstream, we historically have had very different x86 
    codebase compared to either 4.4, 4.4-stable or current Linus' tree, 
    and there are simply too many things happening right now to give this 
    high enough priority, sadly. We're not fully-dependent downstream 
    consumer of -stable any more, so this is one of the expected outcomes, 
    unfortunately; we don't immediately benefit from pushing our 
    downstream changes to stable, as we have to carry those over forward
    ourselves anyway.


Jiri Kosina

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