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

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Message-ID:
 <TYCPR01MB83897C240167E5F8E2C01521836F2@TYCPR01MB8389.jpnprd01.prod.outlook.com>
Date: Fri, 12 Jan 2024 11:25:18 +0000
From: NOMURA JUNICHI(野村　淳一)
	<junichi.nomura@....com>
To: Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tip-commits@...r.kernel.org" <linux-tip-commits@...r.kernel.org>,
	Derek Barbosa <debarbos@...hat.com>, 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"
	<x86@...nel.org>
Subject: RE: [tip: x86/boot] x86/boot: Ignore NMIs during very early boot

> > From: Ingo Molnar <mingo.kernel.org@...il.com>
> > * Borislav Petkov <bp@...en8.de> wrote:
> > > 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.
> >
> > That makes sense. Jun'ichi-san, could you please send a patch for this?
> 
> Thank you for comments.  I currently don't have an environment to send a
> patch without white space damage.  Could it be possible for you to apply
> the attached one?

Sorry for the noise.  Finally I could send it out here without broken tabs.
https://lore.kernel.org/lkml/ZaEe8FC767f+sxRQ@jeru.linux.bs1.fc.nec.co.jp/

--
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.

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