For the first it is a simple check of "xl dmesg" and for x86 platforms
grep either "AMD-Vi" or "Intel VT-d" to see all the IOMMU capabilities
that xen detects.
For ACS I do not know how, but it is possible.
Here is more information on ACS in relation to VFIO, xen doesn't use
groups but it is informative.
https://vfio.blogspot.com/2014/08/iommu-groups-inside-and-out.html
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