linux-kernel - Re: [PATCH v1 25/29] cxl/amd: Enable Zen5 address translation using ACPI PRMT

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Message-ID: <Z4Gjw5LGTppFfuAC@gourry-fedora-PF4VCD3F>
Date: Fri, 10 Jan 2025 17:48:35 -0500
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>,
	Terry Bowman <terry.bowman@....com>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
Subject: Re: [PATCH v1 25/29] cxl/amd: Enable Zen5 address translation using
 ACPI PRMT

On Tue, Jan 07, 2025 at 03:10:11PM +0100, Robert Richter wrote:
> Add AMD platform specific Zen5 support for address translation.
> 
> Zen5 systems may be configured to use 'Normalized addresses'. Then,
> CXL endpoints use their own physical address space and Host Physical
> Addresses (HPAs) need address translation from the endpoint to its CXL
> host bridge. The HPA of a CXL host bridge is equivalent to the System
> Physical Address (SPA).
> 

Just adding the note that I've tested this patch set for HPA==SPA and
found it causes no regressions in my setup.

Still working on testing the normalized address mode due to a few BIOS
quirks I'm running up against.

~Gregory