[Intel-gfx] DMAR PTE access not set

[cacook at quantum-sci.com]

On boot after kernel compile I'm getting:
DMAR PTE access not set. 
Fast TSC calibration failed.
--  It concludes with "DRHD Fault".  And it hangs there.

CentOS 3.10 kernel boots fine with intel_iommu=on.  Why?

VT-d and SRIOV capable (Supermicro) mobo, with both on.  Bing only has
stuff from 2012 and earlier.

Is it possible that this is because iGVT Xen is still on kernel 3.18? 
Is there some way to get on a newer kernel?  Isn't there a newer release
of iGVT Xen?





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