Hi,
> > > Does SEV need and/or use SMM mode? Looking through AmdSevX64.dsc
> > > doesn't give a clear answer, on one hand there is a
> > > LibraryClasses.common.SMM_CORE section, but on the other hand it uses
> > > the non-SMM variable driver stack.
> >
> > I think SEV doesn't work with SMM. James - can you please give a more
> > definitive answer here?
>
> SEV works with SMM, but SEV-ES (and likely SEV-SNP) doesn't work with SMM
> because of the fact that the hypervisor wants to change the guest register
> state to enter SMM, which isn't allowed and results in a VMRUN failure.
Ok. So the same reason why TDX doesn't support SMM either.
> It might be possible to get SMM to work by having separate VMSAs for the SMM
> state, but it is not anything that really has been investigated too deeply.
Should we just drop the SMM leftovers in AmdSevX64.{dsc,fdf} then?
take care,
Gerd
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