linux-kernel - Re: [PATCH v7 05/26] x86/fpu/xstate: Introduce fpu_guest

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Message-ID: <742a95cece1998673aa360be10036c82c0c535ec.camel@intel.com>
Date:   Tue, 28 Nov 2023 14:58:26 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Yang, Weijiang" <weijiang.yang@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>
CC:     "john.allen@....com" <john.allen@....com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Gao, Chao" <chao.gao@...el.com>,
        "mlevitsk@...hat.com" <mlevitsk@...hat.com>
Subject: Re: [PATCH v7 05/26] x86/fpu/xstate: Introduce fpu_guest_cfg for
 guest FPU configuration

On Fri, 2023-11-24 at 00:53 -0500, Yang Weijiang wrote:
> +       /*
> +        * Set guest's __user_state_size to fpu_user_cfg.default_size
> so that
> +        * existing uAPIs can still work.
> +        */
> +       fpu->guest_perm.__user_state_size =
> fpu_user_cfg.default_size;

It seems like an appropriate value, but where does this come into play
exactly for guest FPUs?