Re: [PATCH v5 11/11] intel_sgx: driver documentation

[Peter Zijlstra]

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.