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
