linux-kernel - Re: [patch V2 14/52] x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs

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Message-ID: <87wnqsfyrf.ffs@nanos.tec.linutronix.de>
Date:   Thu, 17 Jun 2021 14:42:44 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Borislav Petkov <bp@...e.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch V2 14/52] x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs_get()

On Wed, Jun 16 2021 at 18:13, Borislav Petkov wrote:

> On Mon, Jun 14, 2021 at 05:44:22PM +0200, Thomas Gleixner wrote:
>> When xsave with init state optimiziation is used then a component's state
>
> 				optimization
>
>> @@ -1062,14 +1062,20 @@ static void copy_feature(bool from_xstat
>>  	membuf_write(to, from_xstate ? xstate : init_xstate, size);
>>  }
>>  
>> -/*
>> - * Convert from kernel XSAVE or XSAVES compacted format to UABI
>> - * non-compacted format and copy to a kernel-space ptrace buffer.
>> +/**
>> + * copy_uabi_xstate_to_membuf - Copy kernel saved xstate to a UABI buffer
>
> If this is what it does, then the function should be called:
>
> copy_xstate_to_uabi_buf()
>
> or so.
>
> "membuf" is only an implementation detail anyway. IMHO.

Yes. Makes sense. Fixed.