RE: [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API

[Tian, Kevin]

> From: Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Wednesday, June 1, 2022 5:37 PM
> 
> On 2022/6/1 09:43, Tian, Kevin wrote:
> >> From: Jacob Pan<jacob.jun.pan@xxxxxxxxxxxxxxx>
> >> Sent: Wednesday, June 1, 2022 1:30 AM
> >>>> In both cases the pasid is stored in the attach data instead of the
> >>>> domain.
> >>>>
> >> So during IOTLB flush for the domain, do we loop through the attach data?
> > Yes and it's required.
> 
> What does the attach data mean here? Do you mean group->pasid_array?

any structure describing the attaching relationship from {device, pasid} to
a domain

> 
> Why not tracking the {device, pasid} info in the iommu driver when
> setting domain to {device, pasid}? We have tracked device in a list when
> setting a domain to device.
> 

Yes, that tracking structure is the attach data. 😊