> From: Jason Gunthorpe <j...@nvidia.com>
> Sent: Tuesday, October 20, 2020 9:55 PM
> On Tue, Oct 20, 2020 at 09:40:14AM +0000, Liu, Yi L wrote:
> > > See previous discussion with Kevin. If I understand correctly, you expect 
> > > a
> shared
> > > L2 table if vDPA and VFIO device are using the same PASID.
> >
> > L2 table sharing is not mandatory. The mapping is the same, but no need to
> > assume L2 tables are shared. Especially for VFIO/vDPA devices. Even within
> > a passthru framework, like VFIO, if the attributes of backend IOMMU are not
> > the same, the L2 page table are not shared, but the mapping is the same.
> I think not being able to share the PASID shows exactly why this VFIO
> centric approach is bad.

no, I didn't say PASID is not sharable. My point is sharing L2 page table is
not mandatory.

Yi Liu

> Jason
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