Assume that an endpoint device(called ep1) belongs to iommu group 1, and 
another endpoint device(called ep2) belongs to iommu group 2.
Moreover, these two devices locate in different downstream ports of the same 
switch respectively. If I disable the ACS of these downstream
ports,  we know ep1 and ep2 should locate in the same iommu group. So the 
question is if I can regenerate a iommu group to let ep1 and ep2
locate in the same iommu group and let ep1 and ep2  can't be assigned to two 
different VMs without  host rebooting?

Cordius Wu

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