linux-kernel - [RFC PATCH v4 15/20] x86/kexec: Add CONFIG_KEXEC

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Message-ID: <20241127190343.44916-16-dwmw2@infradead.org>
Date: Wed, 27 Nov 2024 19:00:29 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: kexec@...ts.infradead.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Woodhouse <dwmw@...zon.co.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Kai Huang <kai.huang@...el.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	linux-kernel@...r.kernel.org,
	Simon Horman <horms@...nel.org>,
	Dave Young <dyoung@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	jpoimboe@...nel.org,
	bsz@...zon.de
Subject: [RFC PATCH v4 15/20] x86/kexec: Add CONFIG_KEXEC_DEBUG option

From: David Woodhouse <dwmw@...zon.co.uk>

This does nothing yet.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 arch/x86/Kconfig.debug | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 74777a97e394..9dde32865a9b 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -56,6 +56,14 @@ config EARLY_PRINTK_USB_XDBC
 	  You should normally say N here, unless you want to debug early
 	  crashes or need a very simple printk logging facility.
 
+config KEXEC_DEBUG
+	bool "Debug kexec transition"
+	depends on KEXEC_CORE && EARLY_PRINTK
+	help
+	  Faults during kexec can be difficult to debug. This installs exception
+	  handlers and attempts to report faults through the same serial port as
+	  used for early_printk.
+
 config EFI_PGT_DUMP
 	bool "Dump the EFI pagetable"
 	depends on EFI
-- 
2.47.0