Messages in this thread | | | Date | Wed, 23 Feb 2022 18:20:36 +0000 | Subject | Re: [PATCH v6 01/11] iommu: Add dma ownership management interfaces | From | Robin Murphy <> |
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On 2022-02-23 18:02, Jason Gunthorpe via iommu wrote: > On Wed, Feb 23, 2022 at 06:00:06PM +0000, Robin Murphy wrote: > >> ...and equivalently just set owner_cnt directly to 0 here. I don't see a >> realistic use-case for any driver to claim the same group more than once, >> and allowing it in the API just feels like opening up various potential >> corners for things to get out of sync. > > I am Ok if we toss it out to get this merged, as there is no in-kernel > user right now. > > Something will have to come back for iommufd, but we can look at what > is best suited then.
If iommufd plans to be too dumb to keep track of whether it already owns a given group or not, I can't see it dealing with attaching that group to a single domain no more than once, either ;)
Robin.
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