Re: [PATCH v4 3/6] iommu/sva: Stop using ioasid_set for SVA

[Baolu Lu]

On 2023/3/3 17:32, Jean-Philippe Brucker wrote:
> > I suppose the common thing is reserving some kind of special PASIDs.
> Are you planning to use RID_PASID != 0 in VT-d?  Otherwise we could just
> communicate min_pasid from the IOMMU driver the same way we do max_pasid.
>
> Otherwise I guess re-introduce a lighter ioasid_alloc() that the IOMMU
> driver calls to reserve PASID0/RID_PASID.

Yes. We probably will use a non-zero RID_PASID in the future. An
interface to reserve (or allocate) a PASID from iommu_global_pasid_ida
should work then.

Best regards,
baolu