Re: [RFC PATCH 1/2] KVM: x86: Add a new system attribute for dynamic XSTATE component

Chang S. Bae
2022-08-25T20:45:38Z

On 8/25/2022 9:19 AM, Sean Christopherson wrote:
>
> Adding new uAPI and new exports to eliminate one line of userspace code is not a
> good tradeoff. Am I missing something? This really seems like solution looking
> for a problem.

Well, then that's your call.

Yeah, that simplification is really minor. With this, I would rather
think KVM wants enforcement before relaying the request to the host.
That enforcement is unthinkable without supported_xcr0. But it looks
like userspace is somehow trusted here for KVM.

Thanks,
Chang