On Mon, Aug 02, 2021 at 02:49:44AM +0000, Tian, Kevin wrote: > Can you elaborate? IMO the user only cares about the label (device cookie > plus optional vPASID) which is generated by itself when doing the attaching > call, and expects this virtual label being used in various spots (invalidation, > page fault, etc.). How the system labels the traffic (the physical RID or RID+ > PASID) should be completely invisible to userspace. I don't think that is true if the vIOMMU driver is also emulating PASID. Presumably the same is true for other PASID-like schemes. Jason
