[PATCH v1 4/5] iommu/arm-smmu-v3: Keep track of attached ssids

[Michael Shavit]

> You should be getting rid of mm->pasid in this series as well.
>
> When each domain keeps track of what STE/CD entries that point to it then
> *ALL* invalidation should iterate over the list of pointing entires
> and generate the correct invalidation for that pointer.
>

Completely agree. The arm_smmu_atc_inv_domain_ssid function introduced
by this patch is a stopgap to decompose this patch from the SVA
refactor that's required to stop using ssid in these calls.
I also agree that such a refactoring probably belongs in the same
patch series. @Jean-Philippe Brucker and others: is there any way I
can about testing or at least exercising the SVA flow without physical
hardware that supports SVA?