Re: [PATCH v6 00/11] cxl: ACPI PRM Address Translation Support and AMD Zen5 enablement

[Gregory Price]

On Mon, Nov 24, 2025 at 07:26:51PM -0800, Alison Schofield wrote:
> On Mon, Nov 24, 2025 at 03:10:07PM -0500, Gregory Price wrote:
> > 
> > IIRC the to_spa() function wouldn't be populated (will be NULL) if this
> > is the case, so you wouldn't even be able to call the translation
> > function.
> 
> The hpa_to_spa fn defined as a root decoder ops is an additional layer for
> arch's needing HPA to SPA translation. It's optional. If there is no
> hpa_to_spa fn, then it is assumed that the CXL HPA==SPA and that is the
> 'final answer'  added to the trace log.
> 
> Sounds like you are on one of these systems, so maybe you could take a
> look at what happens. If your devices support, try to inject and/or
> clear poison and see the resulting kernel trace log. There is an
> example for that here:
> https://github.com/pmem/ndctl/blob/main/test/cxl-poison.sh
> 

Servers am able to test on are @ 6.16 with cxl .17+.18 backports

I don't see: /sys/kernel/debug/cxl/$dev/${action}_poison
in my sysfs

Have enabled enabling various debug and einj options.

When were these added? Am i missing build options?

~Gregory