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Re: [PATCH] libxl: preserve errno in libxl__xcinfo2xlinfo()
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 28 Aug 2025 08:11:35 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 28 Aug 2025 06:11:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.08.2025 03:16, Jason Andryuk wrote:
> On 2025-08-27 01:57, Jan Beulich wrote:
>> Callers observing errors elsewhere may be confused by the ENOSYS that
>> the Flask operation would yield on a Flask-disabled hypervisor.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> Of course I don't know whether clobbering errno is perhaps deemed "fine"
>> in libxl.
>
> I wonder if it would be better to special case
> libxl_flask_sid_to_context() to preserve errno on ENOSYS. flask
> returning ENOSYS is common, but libxl_flask_sid_to_context() can
> legitimately have error.
But then libxl__xcinfo2xlinfo() also shouldn't (effectively) ignore such
other errors? Question is what it should do in such an event.
> I guess this is fine if we want to use this approach:
>
> Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Thanks.
Jan
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