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

[Chang S. Bae]

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