Messages in this thread | | | Date | Wed, 16 Mar 2022 21:04:10 -0300 | From | Jason Gunthorpe <> | Subject | Re: [PATCH v2 3/8] iommu/vt-d: Implement device_pasid domain attach ops |
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On Wed, Mar 16, 2022 at 10:23:26PM +0000, Luck, Tony wrote:
> Kernel users (ring0) can supply any PASID when they use > the ENQCMDS instruction. Is that what you mean when you > say "real applications"?
I'm not talking about ENQCMD at all
I'm saying I don't see much utility to have two PASIDs assigned to the same device that perform the same IOVA translation.
So I would expect the list of attachments in an iommu_domain to have exactly one device in it and multiple PASIDs to the same device from the same iommu_domain is a oddball corner case we don't need to optimize for, beyond being able to allow it to happen.
Jason
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