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Re: [PATCH 0/4] Align handling of domctl/sysctl unsupported commands
- To: Milan Djokic <milan_djokic@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 8 Dec 2025 14:35:12 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 08 Dec 2025 13:35:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.12.2025 21:36, Milan Djokic wrote:
> This patch series provides minor updates to the domctl and sysctl handling
> of unsupported commands. Currently the behavior diverges: some commands
> return -EOPNOTSUPP, while others fall back to the generic -ENOSYS.
> This series aligns the behavior so that unsupported commands consistently
> return the appropriate error code, allowing the control domain to correctly
> identify unsupported operations.
What, even after having looked at all the patches (and their descriptions),
still isn't clear to me is why the distinction ENOSYS vs EOPNOTSUPP would
matter. Tool stacks still need to be prepared to get back ENOSYS, at the
very least as long as they mean to run on older hypervisors as well. And
with Penny's work to allow excluding domctl/sysctl altogether, I expect
ENOSYS would then also be what results if that option is made use of.
Jan
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