Re: [PATCH 03/35] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET)

[Edgecombe, Rick P]

On Mon, 2022-02-07 at 14:45 -0800, Dave Hansen wrote:
> Please add a chunk to the changelog that explains the dependency. 
> This
> would suffice:
> 
>         To protect shadow stack state from malicious modification,
> the
>         registers are only accessible in supervisor mode.  This
>         implementation context-switches the registers with XSAVES. 
> Make
>         X86_FEATURE_SHSTK depend on XSAVES.

Thanks. Yea, I don't think that part of the design is really elaborated
on anywhere. It can be some foreshadowing for the signal stuff later
too.