Re: [Xen-devel] MCE/EDAC Status/Updating?

[Elliott Mitchell <ehem+xen@xxxxxxx>]

On Mon, Feb 18, 2019 at 01:12:16AM -0700, Jan Beulich wrote:
> >>> On 15.02.19 at 19:20, <ehem+xen@xxxxxxx> wrote:
> > On Fri, Feb 15, 2019 at 03:58:49AM -0700, Jan Beulich wrote:
> >> Well, Fam10 is mentioned explicitly, but as per the use of e.g.
> >> mcheck_amd_famXX newer ones are supported by this code
> >> as well.
> > 
> > In that case sometime between Xen 4.1 and Xen 4.4, the AMD MCE/EDAC code
> > was completely broken and hasn't been fixed.
> 
> I can't say I'm surprised, but details of the breakage would still
> be appreciated.

Originally noticed with Debian: https://bugs.debian.org/810964

Original observer noticed that half the memory controllers were missing
from Linux's Domain-0 dmesg with Xen 4.4.  EDAC capability flags are
missing with Xen 4.4.

I'd been working with a processor Linux was reporting as
"cpu family : 16" (ah yes "10h", that funky olde way of refering to
things) and noticing Linux's EDAC support failing on kernel start.  In
which case the EDAC support on AMD processors was completely broken
between 4.1 and 4.4 (hadn't realized that processor was just old enough
to be interesting).


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