netdev - Re: [PATCH v9 23/27] cxl: add region flag for precluding a device memory to be used for dax

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Message-ID: <20250102152403.00000d9d@huawei.com>
Date: Thu, 2 Jan 2025 15:24:03 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: <alejandro.lucero-palau@....com>
CC: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>, Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH v9 23/27] cxl: add region flag for precluding a device
 memory to be used for dax

On Mon, 30 Dec 2024 21:44:41 +0000
alejandro.lucero-palau@....com wrote:

> From: Alejandro Lucero <alucerop@....com>
> 
> By definition a type2 cxl device will use the host managed memory for
> specific functionality, therefore it should not be available to other
> uses. However, a dax interface could be just good enough in some cases.
> 
> Add a flag to a cxl region for specifically state to not create a dax
> device. Allow a Type2 driver to set that flag at region creation time.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> Reviewed-by: Zhi Wang <zhiw@...dia.com>

To me this seems a little premature as it will always be set by known
usecases, but meh, if someone else wants it it is indeed harmless.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>