On Tue, Nov 14, 2017 at 10:49:48PM +0200, Jarkko Sakkinen wrote: > In these cases IA32_FEATURE_CONTROL[17] would be zeroed before locking > the feature control, which would mean that the kernel could not write > new values with wrmsr for the root key hash. > The question is whether we want to allow this or not. If the answer is > no, a check can be added to the driver initialization code whether 17 is > set, and if not, it driver would fail to initialize. That has my vote; I would not trust a firmware/BIOS key.
