linux-kernel - Re: [PATCH v5] x86/setup: Allow passing RNG seeds via e820 setup table

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Date:   Fri, 1 Jul 2022 20:53:14 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] x86/setup: Allow passing RNG seeds via e820 setup table

On Fri, Jul 1, 2022 at 8:52 PM H. Peter Anvin <hpa@...or.com> wrote:
>
> On July 1, 2022 11:42:03 AM PDT, "Jason A. Donenfeld" <Jason@...c4.com> wrote:
> >Hi Peter,
> >
> >On Fri, Jul 01, 2022 at 11:25:49AM -0700, H. Peter Anvin wrote:
> >> Please correct the incredibly confusing title of this patch.
> >>
> >> The setup_data linked list has nothing to do with memory types (e820),
> >> except that memory types is one kind of data that can be passed on by
> >> this mechanism. This title makes it sound like you are passing random
> >> data in as a memory type, which could make some bizarre sense if it
> >> were, say, some kind of ring buffer preconfigured by the BIOS/VMM/boot
> >> loader to be continually overwritten with new random data.
> >
> >Yea that is pretty confusing. Alright, I'll retitle that to something
> >like:
> >
> >    x86/setup: Allow passing RNG seeds via setup data
> >
> >Hopefully that matches more, considering the function that does the work
> >is called "parse_setup_data".
> >
> >(I'll wait some more time before posting yet another v+1 with that
> >change, in case others have more feedback.)
> >
> >Jason
>
> We usually refer to it as setup_data (with the underscore) to indicate that it is a name and not a description.

That makes sense. I'll do that.

Jason