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[Xen-devel] Determining iommu groups in Xen?

This should be a simple question, but I can't find the answer : how are iommu 
groups determined/found in Xen?

I've used KVM before, and the use of the vfio framework makes it easy to find 
the iommu groups. Unless a 'will never be approved' patch is applied to the 
Linux kernel, it is impossible to pass through only one device to a KVM VM out 
of a group due to the lack of ACS (iommu protection between devices on the same 
bus segment).

Xen does not seem to enforce this - why not, especially as it can cause 
security and stability issues?

Sent from my Android device with K-9 Mail. Please excuse my brevity.

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