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

On Sat, Jul 14, 2018 at 02:25:43AM -0700, Srivatsa S. Bhat wrote:
> Hi Greg,
> This patch series is a backport of the Spectre-v2 fixes (IBPB/IBRS)
> and patches for the Speculative Store Bypass vulnerability to 4.4.y
> (they apply cleanly on top of 4.4.140).
> I used 4.9.y as my reference when backporting to 4.4.y (as I thought
> that would minimize the amount of fixing up necessary). Unfortunately
> I had to skip the KVM fixes for these vulnerabilities, as the KVM
> codebase is drastically different in 4.4 as compared to 4.9. (I tried
> my best to backport them initially, but wasn't confident that they
> were correct, so I decided to drop them from this series).
> You'll notice that the initial few patches in this series include
> cleanups etc., that are non-critical to IBPB/IBRS/SSBD. Most of these
> patches are aimed at getting the cpufeature.h vs cpufeatures.h split
> into 4.4, since a lot of the subsequent patches update these headers.
> On my first attempt to backport these patches to 4.4.y, I had actually
> tried to do all the updates on the cpufeature.h file itself, but it
> started getting very cumbersome, so I resorted to backporting the
> cpufeature.h vs cpufeatures.h split and their dependencies as well. I
> think apart from these initial patches, the rest of the patchset
> doesn't have all that much noise. 
> This patchset has been tested on both Intel and AMD machines (Intel
> Xeon CPU E5-2660 v4 and AMD EPYC 7281 16-Core Processor, respectively)
> with updated microcode. All the patch backports have been
> independently reviewed by Matt Helsley, Alexey Makhalov and Bo Gan.
> I would appreciate if you could kindly consider these patches for
> review and inclusion in a future 4.4.y release.

Given no one has complained about these yet, I've queued them all up,
including the 2 extra ones you sent afterward.

Let's see what breaks :)


greg k-h

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