| Date | Wed, 09 Aug 2023 09:12:18 +0200 | From | Peter Zijlstra <> | Subject | [RFC][PATCH 00/17] Fix up the recent SRSO patches |
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Since I wasn't invited to the party (even though I did retbleed), I get to clean things up afterwards :/
Anyway, this here overhauls the SRSO patches in a big way.
I claim that AMD retbleed (also called Speculative-Type-Confusion -- not to be confused with Intel retbleed, which is an entirely different bug) is fundamentally the same as this SRSO -- which is also caused by STC. And the mitigations are so similar they should all be controlled from a single spot and not conflated like they are now.
As such, at the end of the ride the new kernel command line and srso sysfs files are no more and all we're left with is a few extra retbleed options.
Aside of that; this deals with a few implementation issues -- but not all known issues. Josh and Andrew are telling me there's a problem when running inside virt due to how this checks the microcode. I'm hoping either of those two gents will add a patch to address this.
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