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...ng VT-d, is there a work around that > doesn''t involve applying kernel or xen patches on either Do0mU or DomU. Yes, I have seen this as well, and I think it has to do with how the system supports Function Level Reset (FLR), see http://lists.xensource.com/archives/html/xen-devel/2008-07/msg00626.html. Your cards probably are behind the same PCI bridge. If you don''t care about the FLR functionality, then you could remove the checks for this in tools/python/xen/xend/server/pciif.py - you just need to recompile the Xen tools in Dom0, but no kernel changes. This is a hack though rathe...