Re: [PATCH 5.4 00/37] IBRS support // Retbleed mitigations

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On Mon, Oct 03, 2022 at 10:10:01AM -0300, Thadeu Lima de Souza Cascardo wrote:
> This backport introduces IBRS support to 5.4.y in order to mitigate Retbleed on
> Intel parts. Though some very small pieces for AMD have been picked up as well,
> "UNRET" mitigations are not backported, nor IBPB. It is expected, though, that
> the backport will report AMD systems as vulnerable or not affected, depending
> on the parts and the BTC_NO bit.
> 
> One note here is that the PBRSB mitigation was backported previously to the 5.4
> series, and this would have made things a little bit more complicated. So, I
> reverted it and applied it later on.
> 
> This has been boot-tested and smoke-tested on a bunch of AMD and Intel systems.

Thank you for these, I've queued them up now and will do a -rc release
with them to get some testing.

greg k-h



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