On Mon, Aug 19, 2024 at 03:28:11PM -0300, Jason Gunthorpe wrote: > On Mon, Aug 19, 2024 at 11:19:39AM -0700, Nicolin Chen wrote: > > > > But nesting enablment with out viommu is alot less useful than I had > > > thought :( > > > > Actually, without viommu, the hwpt cache invalidate alone could > > still support non-SVA case? > > That is what I thought, but doesn't the guest still have to invalidate > the CD table entry # 0?
I recall it doesn't. The CD cache invalidation is required in the viommu invalidation for an SVA case where we need a PASID number to specify CD to the substream. But the CD to the default stream is only changed during a vSTE setup, and the host knows the PASID number (=0)? > > Though we still have the blocker at the msi mapping... It still > > requires a solution, even for viommu series. > > Yes, small steps. The point of this step was to get the nested paging > only (without msi, pri, etc, etc) Ack. Thanks Nicolin
