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
