Xen users - Nov 2013 - Xenserver 6.2 pci passtrhough problem: Internal error: xenopsd internal error: Xenctrl.Error("14: Bad address")

Hi all,
I''m not sure if this would be the right place to ask this since
it''s about xenserver, still I want to exploit any help I can get ;)
The Problem:As it turns out I can run 2 VM''s with passedthrough pci
devices without any problems, but when I try to start a third one I get the
"Internal error: xenopsd internal error: Xenctrl.Error("14: Bad
address")" error which I can''t seem to get rid off... I tried
any possible combination of booting the VM''s but I can get only two
working at the same time.
When looking at the xl dmesg log this looks most interesting:(XEN) AMD-Vi: Setup
I/O page table: device id = 0x0200, root table = 0x284120000, domain = 3, paging
mode = 2(XEN) AMD-Vi: Re-assign 02:00.0 from domain 0 to domain 3(XEN) AMD-Vi:
Cannot allocate I/O page table(XEN) AMD-Vi: Invalid IO pagetable entry gfn =
13ec00(XEN) domain_crash called from iommu_map.c:585
But I''ve no idea what might cause this and how to fix it...
System summary:mainboard: Gigabyte GA-990FXA-UD3 rev. 1.2 (modified bios by
gigabyte to get pci passthrough working in the first place)Cpu: AMD FX8350RAM:
16GBGPU''s: 2x AMD HD5870 + nVidia GTS450
Other possible relevant info is in the attached files...
Thanks in advance for any help!
Cheers,Marien 		 	   		  








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