[PATCH RFC v6 5/5] iommu/arm-smmu-v3: Wire up shared-SID STE ordering and feature gating

[Jason Gunthorpe]

On Tue, Oct 13, 2026 at 12:22:06PM +0100, Robin Murphy wrote:
> If we're not going to support PASID for shared streams (which I suggest we
> don't...) than we shouldn't strictly need to worry about CD tables anyway.
> So rather than having to special-case CD table sharing for shared streams,
> perhaps it might make sense to generalise back to a "default" per-domain CD
> for non-PASID use, which can then get switched for the private per-stream
> cd_table if and when a device does enable PASID?

If we have stared STEs then the group becomes the per-STE data
structure not the master.. We don't have any way right now to do that,
but it would make some sense for the group to store the shared CD

Jason