From: Alison Schofield <alison.schofield@intel.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Cc: <linux-cxl@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<nvdimm@lists.linux.dev>, <linux-fsdevel@vger.kernel.org>,
<linux-pm@vger.kernel.org>, Davidlohr Bueso <dave@stgolabs.net>,
"Jonathan Cameron" <jonathan.cameron@huawei.com>,
Dave Jiang <dave.jiang@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@kernel.org>,
Li Ming <ming.li@zohomail.com>,
Jeff Johnson <jeff.johnson@oss.qualcomm.com>,
"Ying Huang" <huang.ying.caritas@gmail.com>,
Yao Xingtao <yaoxt.fnst@fujitsu.com>,
Peter Zijlstra <peterz@infradead.org>,
Greg KH <gregkh@linuxfoundation.org>,
Nathan Fontenot <nathan.fontenot@amd.com>,
Terry Bowman <terry.bowman@amd.com>,
Robert Richter <rrichter@amd.com>,
Benjamin Cheatham <benjamin.cheatham@amd.com>,
PradeepVineshReddy Kodamati <PradeepVineshReddy.Kodamati@amd.com>,
Zhijian Li <lizhijian@fujitsu.com>
Subject: Re: [PATCH 0/6] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL
Date: Tue, 26 Aug 2025 16:21:07 -0700 [thread overview]
Message-ID: <aK5BY7bQ_dMZLFNT@aschofie-mobl2.lan> (raw)
In-Reply-To: <20250822034202.26896-1-Smita.KoralahalliChannabasappa@amd.com>
On Fri, Aug 22, 2025 at 03:41:56AM +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,
I was able to try this out today and it looks good. See one question
about the !CXL_REGION case below.
Test case of a hot replace a dax region worked as expected. It appeared
with no soft reserved and after tear down, the same region could be
rebuilt in place.
Test case with CONFIG_CXL_REGION=N looks good too, as in DAX consumed
the entire resource. Do we intend the Soft Reserved resource to remain
like this:
c080000000-17dbfffffff : CXL Window 0
c080000000-c47fffffff : Soft Reserved
c080000000-c47fffffff : dax2.0
c080000000-c47fffffff : System RAM (kmem)
These other issues noted previously did not re-appear:
- kmem dax3.0: probe with driver kmem failed with error -16
- resource: Unaddressable device [ ] conflicts with []
-- Alison
snip
next prev parent reply other threads:[~2025-08-26 23:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-22 3:41 [PATCH 0/6] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL Smita Koralahalli
2025-08-22 3:41 ` [PATCH 1/6] dax/hmem, e820, resource: Defer Soft Reserved registration until hmem is ready Smita Koralahalli
2025-09-01 2:59 ` Zhijian Li (Fujitsu)
2025-09-30 4:01 ` Koralahalli Channabasappa, Smita
2025-09-08 23:01 ` dan.j.williams
2025-09-11 19:39 ` Koralahalli Channabasappa, Smita
2025-09-25 18:17 ` dan.j.williams
2025-09-09 16:12 ` Borislav Petkov
2025-09-30 4:56 ` Koralahalli Channabasappa, Smita
2025-12-18 17:52 ` dan.j.williams
2026-01-13 18:29 ` dan.j.williams
2025-08-22 3:41 ` [PATCH 2/6] dax/hmem: Request cxl_acpi and cxl_pci before walking Soft Reserved ranges Smita Koralahalli
2025-09-01 3:08 ` Zhijian Li (Fujitsu)
2025-09-04 17:35 ` Dave Jiang
2025-08-22 3:41 ` [PATCH 3/6] dax/hmem, cxl: Tighten dependencies on DEV_DAX_CXL and dax_hmem Smita Koralahalli
2025-09-01 3:28 ` Zhijian Li (Fujitsu)
2025-09-30 4:04 ` Koralahalli Channabasappa, Smita
2025-08-22 3:42 ` [PATCH 4/6] dax/hmem: Defer Soft Reserved overlap handling until CXL region assembly completes Smita Koralahalli
2025-09-01 4:01 ` Zhijian Li (Fujitsu)
2025-08-22 3:42 ` [PATCH 5/6] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree Smita Koralahalli
2025-09-04 18:14 ` Dave Jiang
2025-09-10 13:41 ` Jonathan Cameron
2025-09-30 4:03 ` Koralahalli Channabasappa, Smita
2025-08-22 3:42 ` [RFC PATCH 6/6] cxl/region, dax/hmem: Guard CXL DAX region creation and tighten HMEM deps Smita Koralahalli
2025-09-01 6:21 ` Zhijian Li (Fujitsu)
2025-09-30 4:06 ` Koralahalli Channabasappa, Smita
2025-08-26 23:21 ` Alison Schofield [this message]
2025-08-28 23:34 ` [PATCH 0/6] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL Koralahalli Channabasappa, Smita
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