This answer covers it well: https://security.stackexchange.com/a/189978 Basicall...

		tredre3 11 months ago \| parent \| context \| favorite \| on: Ask HN: Why is there not more concern about the ph... This answer covers it well: https://security.stackexchange.com/a/189978 Basically depending on the scenario, DMA region will either be unencrypted or transparently encrypted/decrypted.