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De Francesco" Cc: linux-cxl@vger.kernel.org, Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Ira Weiny , Dan Williams , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] cxl: docs/driver-api/conventions resolve conflicts btw CFMWS, LMH, ED Message-ID: References: <20250623152923.1048525-1-fabio.m.de.francesco@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250623152923.1048525-1-fabio.m.de.francesco@linux.intel.com> On Mon, Jun 23, 2025 at 05:29:02PM +0200, Fabio M. De Francesco wrote: > Add documentation on how to resolve conflicts between CXL Fixed Memory > Windows, Platform Memory Holes, and Endpoint Decoders. > > Signed-off-by: Fabio M. De Francesco I won't block a doc update on a suggestion so Reviewed-by: Gregory Price > +Platform Firmware (BIOS) might reserve part of physical addresses below > +4 GB (e.g., the Low Memory Hole that describes PCIe memory space for MMIO > +or a requirement for the greater than 8 way interleave CXL regions starting > +at address 0). In that case the Window Size value cannot be anymore > +constrained to the NIW * 256 MB above-mentioned rule. It might be nice to have a diagram that explains this visually, as it's difficult for me to understand the implications through words alone... which is likely why the conflict exists in the first place :] ~Gregory