linux-kernel - Re: [PATCH v2 11/15] cxl/region: Use the endpoint's SPA range to check a region

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Message-ID: <Z_VGxdwtsbKvLMr8@gourry-fedora-PF4VCD3F>
Date: Tue, 8 Apr 2025 11:54:45 -0400
From: Gregory Price <gourry@...rry.net>
To: Robert Richter <rrichter@....com>
Cc: Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
	Terry Bowman <terry.bowman@....com>
Subject: Re: [PATCH v2 11/15] cxl/region: Use the endpoint's SPA range to
 check a region

On Tue, Feb 18, 2025 at 02:23:52PM +0100, Robert Richter wrote:
> Endpoints or switches requiring address translation might not be aware
> of the system's interleaving configuration. Then, the configured
> endpoint's address range might not match the expected range. In
> contrast, the SPA range of an endpoint is calculated applying platform
> specific address translation. That range is correct and can be used to
> check a region range.
> 
> Adjust the region range check and use the endpoint's SPA range to
> check it.
> 
> Signed-off-by: Robert Richter <rrichter@....com>

Like other patches, I think this can probably just be folded into patch
5 under the comment that cxled->spa_range == cxled->cxld.hpa_range for
all systems that do not implement a translation mechanism.

~Gregory