svn commit: r348109 - in head/sys/x86: include x86

[Conrad Meyer]

On Wed, May 22, 2019 at 12:59 PM John Baldwin <jhb at freebsd.org> wrote:

> On 5/22/19 12:12 PM, Conrad Meyer wrote:
> > On Wed, May 22, 2019 at 11:06 AM Andriy Gapon <avg at freebsd.org> wrote:
> >>
> >> On 22/05/2019 16:44, Andrew Gallatin wrote:
> >>>   This is needed for AMD SMCA processors, as SMCA uses different
> >>>   MSR address for access MCA banks.
> >>
> >> Just curious, what is SMCA?
> >
> > Scalable MCA.  It's a set of AMD Fam17h MCA extensions.
>
> How is it different aside from using different MSR numbers (which seems
> a bit gratuitous if that is really all the change is).
>
> --
> John Baldwin
>
It adds new MSRs as well, though those are not present in this first
change.  And adds some information not representable in the “legacy” MSRs.
Some more detail can be found in the linux patches, eg
https://lore.kernel.org/patchwork/patch/655889/ .