linux-kernel - Re: [PATCH tip v8] x86/setup: Use rng seeds from setup

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Message-ID: <191d8f96-7573-bd0e-9ca4-3fc22c5c9a49@zytor.com>
Date:   Sat, 9 Jul 2022 14:45:24 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH tip v8] x86/setup: Use rng seeds from setup_data

On 7/9/22 02:49, Borislav Petkov wrote:
> On Fri, Jul 08, 2022 at 06:51:16PM -0700, H. Peter Anvin wrote:
>> #define SETUP_ENUM_MAX	SETUP_RNG_SEED
>> #define SETUP_INDIRECT	(1<<31)
>> #define SETUP_TYPE_MAX	(SETUP_ENUM_MAX | SETUP_INDIRECT)
> 
> Wait, if we get to add a new number, SETUP_ENUM_MAX and thus
> SETUP_TYPE_MAX will change. And they're uapi too...

Talking API here rather than ABI, i.e. the semantics of those symbols.

	-hpa