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	<junichi.nomura@nec.com>
To: Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-tip-commits@vger.kernel.org" <linux-tip-commits@vger.kernel.org>,
	Derek Barbosa <debarbos@redhat.com>, Kees Cook <keescook@chromium.org>, Linus
 Torvalds <torvalds@linux-foundation.org>, "Paul E. McKenney"
	<paulmck@kernel.org>, Andy Lutomirski <luto@kernel.org>, "H. Peter Anvin"
	<hpa@zytor.com>, Peter Zijlstra <peterz@infradead.org>, "x86@kernel.org"
	<x86@kernel.org>
Subject: RE: [tip: x86/boot] x86/boot: Ignore NMIs during very early boot
Thread-Topic: [tip: x86/boot] x86/boot: Ignore NMIs during very early boot
Thread-Index: AQHaI2uaswWtxdJdRk2imQ4QifdYgrCSqoWAgD1UjoCAASrP8A==
Date: Tue, 9 Jan 2024 05:17:42 +0000
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> From: Ingo Molnar <mingo.kernel.org@gmail.com>
> * Borislav Petkov <bp@alien8.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?

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

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	filename="x86-early-nmi-add-msg.patch"

x86/boot: Add a message to early NMI handler=0A=
=0A=
Add a message to help diagnosis for the case if someone wants to know=0A=
what happened to NMIs during very early boot.=0A=
=0A=
Signed-off-by: Jun'ichi Nomura <junichi.nomura@nec.com>=0A=
Suggested-by: Borislav Petkov <bp@alien8.de>=0A=
Link: =
https://lore.kernel.org/lkml/20231130103339.GCZWhlA196uRklTMNF@fat_crate.=
local/=0A=
=0A=
diff --git a/arch/x86/boot/compressed/ident_map_64.c =
b/arch/x86/boot/compressed/ident_map_64.c=0A=
index d040080d7edb..f2858a373099 100644=0A=
--- a/arch/x86/boot/compressed/ident_map_64.c=0A=
+++ b/arch/x86/boot/compressed/ident_map_64.c=0A=
@@ -390,4 +390,5 @@ void do_boot_page_fault(struct pt_regs *regs, =
unsigned long error_code)=0A=
 void do_boot_nmi_trap(struct pt_regs *regs, unsigned long error_code)=0A=
 {=0A=
 	/* Empty handler to ignore NMI during early boot */=0A=
+	error_putstr("Spurious early NMI ignored.\n");=0A=
 }=0A=

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