[isopede]

Isn't this just an instance of "trusting trust?" How do you know the IOMMU hasn't been backdoored? "Open" firmware doesn't mean open RTL. Where is the line drawn?

[Dylan16807]

Whether you want open firmware in the first place is a significantly different question from how you isolate hardware with closed firmware.

But more directly, worrying about one part having a backdoor is a lot better than worrying about twenty parts having a backdoor.