Re: [PATCH v2] cxl/hdm: Enforce CFMWS memory type policy at decoder commit time

[Mayank Rana]

Hi Davidlohr

Thank you for your review and suggestion.

On 7/13/2026 9:04 AM, Davidlohr Bueso wrote:
> On Fri, 10 Jul 2026, Mayank Rana wrote:
>
> > A CXL Fixed Memory Window Structure (CFMWS) in the ACPI CEDT table
> > carries a restrictions field that describes the memory types a platform
> > window supports.  cfmws_to_decoder_flags() translates this into
> > CXL_DECODER_F_TYPE2 (HDM-DB permitted) and CXL_DECODER_F_TYPE3 (HDM-H
> > permitted) flags on the root decoder.
> >
> > However, nothing currently prevents a caller from committing an endpoint
> > or switch decoder whose target_type conflicts with the CFMWS policy:
>
> Hi Mayank - please refer to the latest Back Invalidate patchset (v5)
> for properly dealing with this:
>
> https://lore.kernel.org/all/20260615145529.13848-1-dave@xxxxxxxxxxxx/
Ok. I will review propose changes, and rework upon this fix.

Regards,
Mayank

> Thanks,
> Davidlohr