linux-kernel - Re: [PATCH v3 0/5] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL

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Message-ID: <aORp6MpbPMIamNBh@aschofie-mobl2.lan>
Date: Mon, 6 Oct 2025 18:16:24 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nvdimm@...ts.linux.dev>, <linux-fsdevel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, Davidlohr Bueso <dave@...olabs.net>, "Jonathan
 Cameron" <jonathan.cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
	"Dan Williams" <dan.j.williams@...el.com>, Matthew Wilcox
	<willy@...radead.org>, Jan Kara <jack@...e.cz>, "Rafael J . Wysocki"
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	Zhijian Li <lizhijian@...itsu.com>, "Borislav Petkov" <bp@...en8.de>, Ard
 Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v3 0/5] dax/hmem, cxl: Coordinate Soft Reserved handling
 with CXL

On Tue, Sep 30, 2025 at 04:47:52AM +0000, Smita Koralahalli wrote:
> This series aims to address long-standing conflicts between dax_hmem and
> CXL when handling Soft Reserved memory ranges.

Hi Smita,

Thanks for the updates Smita!

About those "long-standing conflicts": In the next rev, can you resurrect,
or recreate the issues list that this set is addressing. It's been a
long and winding road with several handoffs (me included) and it'll help
keep the focus.

Hotplug works :)  Auto region comes up, we tear it down and can recreate it,
in place, because the soft reserved resource is gone (no longer occupying
the CXL Window and causing recreate to fail.)

!CONFIG_CXL_REGION works :) All resources go directly to DAX.

The scenario that is failing is handoff to DAX after region assembly
failure. (Dan reminded me to check that today.) That is mostly related
to Patch4, so I'll respond there.

--Alison