linux-kernel - Re: [PATCH v4 3/9] dax/hmem: Gate Soft Reserved deferral on DEV_DAX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f35d86cd-03f8-4e0b-8373-8d8e749aaa8e@intel.com>
Date: Tue, 2 Dec 2025 16:32:24 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
 linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 nvdimm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
 linux-pm@...r.kernel.org
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>,
 Yazen Ghannam <yazen.ghannam@....com>, Davidlohr Bueso <dave@...olabs.net>,
 Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
 "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <len.brown@...el.com>,
 Pavel Machek <pavel@...nel.org>, Li Ming <ming.li@...omail.com>,
 Jeff Johnson <jeff.johnson@....qualcomm.com>,
 Ying Huang <huang.ying.caritas@...il.com>,
 Yao Xingtao <yaoxt.fnst@...itsu.com>, Peter Zijlstra <peterz@...radead.org>,
 Greg KH <gregkh@...uxfoundation.org>,
 Nathan Fontenot <nathan.fontenot@....com>,
 Terry Bowman <terry.bowman@....com>, Robert Richter <rrichter@....com>,
 Benjamin Cheatham <benjamin.cheatham@....com>,
 Zhijian Li <lizhijian@...itsu.com>, Borislav Petkov <bp@...en8.de>,
 Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v4 3/9] dax/hmem: Gate Soft Reserved deferral on
 DEV_DAX_CXL

On 11/19/25 8:19 PM, Smita Koralahalli wrote:
> From: Dan Williams <dan.j.williams@...el.com>
> 
> Replace IS_ENABLED(CONFIG_CXL_REGION) with IS_ENABLED(CONFIG_DEV_DAX_CXL)
> so that HMEM only defers Soft Reserved ranges when CXL DAX support is
> enabled. This makes the coordination between HMEM and the CXL stack more
> precise and prevents deferral in unrelated CXL configurations.
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>> ---
>  drivers/dax/hmem/hmem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
> index 02e79c7adf75..c2c110b194e5 100644
> --- a/drivers/dax/hmem/hmem.c
> +++ b/drivers/dax/hmem/hmem.c
> @@ -66,7 +66,7 @@ static int hmem_register_device(struct device *host, int target_nid,
>  	long id;
>  	int rc;
>  
> -	if (IS_ENABLED(CONFIG_CXL_REGION) &&
> +	if (IS_ENABLED(CONFIG_DEV_DAX_CXL) &&
>  	    region_intersects(res->start, resource_size(res), IORESOURCE_MEM,
>  			      IORES_DESC_CXL) != REGION_DISJOINT) {
>  		dev_dbg(host, "deferring range to CXL: %pr\n", res);