Re: [patch 1/6] x86/fpu: Extend fpu_xstate_prctl() with guest permissions

[Paolo Bonzini]

On 12/14/21 06:13, Tian, Kevin wrote:
> >    2) Permissions are frozen when the first vCPU is created to ensure
> >       consistency. Any attempt to expand permissions via the prctl() after
> >       that point is rejected.
>
> A curiosity question. Do we allow the user to reduce permissions?

No, there's no prctl for that.

Paolo