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Re: [RFC PATCH v5 05/10] drivers: iommu: change error code when iommu is disabled
- To: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 22 Jul 2025 14:29:02 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 22 Jul 2025 12:29:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.07.2025 13:41, Oleksii Moisieiev wrote:
> Change -ENOPNOTSUPP error code to -ENXIO when iommu is disabled during
> iommu_do_domctl call. As was discussed in [1]
>
> [0]:
> https://lore.kernel.org/xen-devel/alpine.DEB.2.22.394.2506171701190.1780597@ubuntu-linux-20-04-desktop/
Hmm, I can't read any justification for the choice of the particular error
code out of that email. How's ENXIO going to be (and remain) unique? If you
need a specific indication of the IOMMU being disabled, I think you want to
have a specific query for that. Assuming XEN_SYSCTL_PHYSCAP_directio isn't
enough (for whatever reason).
Jan
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