On 25/08/2021 15:36, Jan Beulich wrote: > On 25.08.2021 14:12, Andrew Cooper wrote: >> On 24/08/2021 14:04, Jan Beulich wrote: >>> On 19.08.2021 18:26, Andrew Cooper wrote: >>>> In some configurations, it is safe to not overwrite the RSB on entry to >>>> Xen. >>>> Both Intel and AMD have guidelines in this area, because of the performance >>>> difference it makes for native kernels. >>> I don't think I've come across AMD's guidelines - would you happen to >>> have a pointer? >> APM Vol2 3.2.9 "Speculation Control MSRs" >> >> The information about SMEP is in the final paragraph before describing >> MSR_SPEC_CTRL.STIBP. > Ah yes, thanks. Still need to get used to this now being in the PM rather > than in one or more separate docs. I now recall reading through this.
I'm still pushing Intel to add a section/chapter to the SDM, because this is is all architectural functionality and interfaces. ~Andrew
