Re: [PATCH v2] cxl/mbox: Support Media Operation

[Davidlohr Bueso <dave@stgolabs.net>]

On Tue, 28 Apr 2026, Dave Jiang wrote:
>> +What:		/sys/bus/cxl/devices/memX/security/zero
>> +Date:		April, 2026
>> +KernelVersion:	v7.2
>> +Contact:	linux-cxl@vger.kernel.org
>> +Description:
>> +		(WO) Write a DPA range as 'start length' in bytes to this
>
>Same comment about multiple input in a single attribute. Maybe introduce these:
>
>security/zero_start_dpa
>security/zero_len
>security/zero

I had missed this feedback - this suggested interface is horrible. While the
sysfs documentation mentions the one rule per file, this is not strict and
(as Jonathan also agreed previously) we can do <start> <len> inputs. There
are plenty of examples that do not follow this rule when it makes sense.

So my follow up patches will do

echo <start_dpa> <len> > /sys/bus/cxl/devices/mem0/security/sanitize_range
echo <start_dpa> <len> > /sys/bus/cxl/devices/mem0/security/zero_range

Thanks,
Davidlohr