Thunderclap TL;DR: someone finally tried on PCs (over Thunderbolt) what we did on the PS4 (over PCIe) years ago. As I said at the time, IOMMUs are useless if the drivers are not written assuming the device is evil. *Nobody* writes PCIe drivers assuming the device is evil.
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Replying to @nanayapro
Yes, but 1394 predated IOMMUs so it was a free-for-all and drivers didn't matter. The only driver that used that is storage (sbp2), and sane OSes started only enabling DMA when such a device was connected. You can disable that support and 1394 is safe.
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