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this work from 2011 by IVT doesn't exactly inspire confidence. http://theinvisiblethings.blogspot.com/2011/05/following-white-rabbit-software-attacks.html http

• tptacek 12y ago
  Sure, but getting an IOMMU right on a complicated platform that didn't historically lean on IOMMUs is different than "the IOMMU is backdoored". Why this isn't just a nit is, if you believe (say) VT-d is backdoored, a lack of IVT research projects isn't evidence of the absence of backdoors. Presumably, if the NSA is serious enough to backdoor Intel chipsets, they'll do it in a manner that a couple of independent security researchers can't black-box.