linux-kernel - Re: [PATCH v9 03/13] cxl/region: Store HPA range in struct cxl

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Message-ID: <aWcKEVHbNG3ctk9f@aschofie-mobl2.lan>
Date: Tue, 13 Jan 2026 19:14:25 -0800
From: Alison Schofield <alison.schofield@...el.com>
To: Robert Richter <rrichter@....com>
CC: 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>, Gregory Price <gourry@...rry.net>, "Fabio M.
 De Francesco" <fabio.m.de.francesco@...ux.intel.com>, Terry Bowman
	<terry.bowman@....com>, Joshua Hahn <joshua.hahnjy@...il.com>
Subject: Re: [PATCH v9 03/13] cxl/region: Store HPA range in struct cxl_region

On Sat, Jan 10, 2026 at 12:46:48PM +0100, Robert Richter wrote:
> Each region has a known host physical address (HPA) range it is
> assigned to. Endpoint decoders assigned to a region share the same HPA
> range. The region's address range is the system's physical address
> (SPA) range.
> 
> Endpoint decoders in systems that need address translation use HPAs
> which are not SPAs. To make the SPA range accessible to the endpoint
> decoders, store and track the region's SPA range in struct cxl_region.
> Introduce the @hpa_range member to the struct. Now, the SPA range of
> an endpoint decoder can be determined based on its assigned region.
> 
> Patch is a prerequisite to implement address translation which uses
> struct cxl_region to store all relevant region and interleaving
> parameters.

Reviewed-by: Alison Schofield <alison.schofield@...el.com>