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...s uses one or the other mechanism so it's per-unbind). Then we still have to synchronize unbind() with the fault handler to deal with the pending stop marker, which might have already gone through or be generated later. Currently we ignore all that and just flush the PRI queue, followed by the IOPF queue, to get rid of any stale fault before reassigning the PASID. A guest however would also need to first flush the HW PRI queue, but doesn't have a direct way to do that. If we want to support guests that don't deal with stop markers, the host needs to flush the PRI queue when a PASID is...