linux-kernel - [PATCH v2 0/2] kgdb: x86: fix breakpoint removal problems

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Message-ID: <20240812174338.363838-1-mail@florommel.de>
Date: Mon, 12 Aug 2024 19:43:35 +0200
From: Florian Rommel <mail@...rommel.de>
To: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Douglas Anderson <dianders@...omium.org>,
	Lorena Kretzschmar <qy15sije@....cs.fau.de>,
	Stefan Saecherl <stefan.saecherl@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Randy Dunlap <rdunlap@...radead.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	kgdb-bugreport@...ts.sourceforge.net,
	x86@...nel.org,
	linux-kernel@...r.kernel.org
Cc: Florian Rommel <mail@...rommel.de>
Subject: [PATCH v2 0/2] kgdb: x86: fix breakpoint removal problems

This series fixes two problems with KGDB on x86 concerning the removal
of breakpoints, causing the kernel to hang.  Note that breakpoint
removal is not only performed when explicitly deleting a breakpoint,
but also happens before continuing execution or single stepping.

v2:
 - Add missing stub implementation for kgdb_after_mark_readonly in [1/2]
   when KGDB disabled
 - Link to v1: https://lore.kernel.org/all/20240811232208.234261-1-mail@florommel.de/

Florian Rommel (2):
  x86/kgdb: convert early breakpoints to poke breakpoints
  x86/kgdb: fix hang on failed breakpoint removal

 arch/x86/kernel/kgdb.c    | 38 ++++++++++++++++++++++++++++++++++++++
 include/linux/kgdb.h      |  4 ++++
 init/main.c               |  1 +
 kernel/debug/debug_core.c |  7 ++++++-
 4 files changed, 49 insertions(+), 1 deletion(-)

-- 
2.46.0