linux-kernel - Re: [tip: x86/boot] x86/boot: Ignore NMIs during very early boot

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Date:   Thu, 30 Nov 2023 11:33:39 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     linux-kernel@...r.kernel.org
Cc:     linux-tip-commits@...r.kernel.org,
        Jun'ichi Nomura <junichi.nomura@....com>,
        Derek Barbosa <debarbos@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: Re: [tip: x86/boot] x86/boot: Ignore NMIs during very early boot

On Thu, Nov 30, 2023 at 08:59:44AM -0000, tip-bot2 for Jun'ichi Nomura wrote:
> +void do_boot_nmi_trap(struct pt_regs *regs, unsigned long error_code)
> +{
> +	/* Empty handler to ignore NMI during early boot */

It might be good to issue something here to say that a spurious NMI got
ignored.

Something ala

	error_putstr("Spurious early NMI ignored.\n");

so that we at least say that we ignored an NMI and not have it disappear
unnoticed.

Hmmm.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette