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

[Davidlohr Bueso]

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/

Thanks,
Davidlohr