linux-kernel - [PATCH v2 06/17] kexec: Add config option for KHO

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Message-ID: <20231222195144.24532-1-graf@amazon.com>
Date: Fri, 22 Dec 2023 19:51:33 +0000
From: Alexander Graf <graf@...zon.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-trace-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<kexec@...ts.infradead.org>, <linux-doc@...r.kernel.org>, <x86@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>, "H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	"Rob Herring" <robh+dt@...nel.org>, Steven Rostedt <rostedt@...dmis.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>, Mark Rutland
	<mark.rutland@....com>, "Tom Lendacky" <thomas.lendacky@....com>, Ashish
 Kalra <ashish.kalra@....com>, James Gowans <jgowans@...zon.com>, Stanislav
 Kinsburskii <skinsburskii@...ux.microsoft.com>, <arnd@...db.de>,
	<pbonzini@...hat.com>, <madvenka@...ux.microsoft.com>, Anthony Yznaga
	<anthony.yznaga@...cle.com>, Usama Arif <usama.arif@...edance.com>, David
 Woodhouse <dwmw@...zon.co.uk>, Benjamin Herrenschmidt
	<benh@...nel.crashing.org>
Subject: [PATCH v2 06/17] kexec: Add config option for KHO

We have all generic code in place now to support Kexec with KHO. This
patch adds a config option that depends on architecture support to
enable KHO support.

Signed-off-by: Alexander Graf <graf@...zon.com>
---
 kernel/Kconfig.kexec | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 2fd510256604..909ab28f1341 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -91,6 +91,19 @@ config KEXEC_JUMP
 	  Jump between original kernel and kexeced kernel and invoke
 	  code in physical address mode via KEXEC
 
+config KEXEC_KHO
+	bool "kexec handover"
+	depends on ARCH_SUPPORTS_KEXEC_KHO
+	depends on KEXEC
+	select MEMBLOCK_SCRATCH
+	select LIBFDT
+	select CMA
+	help
+	  Allow kexec to hand over state across kernels by generating and
+	  passing additional metadata to the target kernel. This is useful
+	  to keep data or state alive across the kexec. For this to work,
+	  both source and target kernels need to have this option enabled.
+
 config CRASH_DUMP
 	bool "kernel crash dumps"
 	depends on ARCH_SUPPORTS_CRASH_DUMP
-- 
2.40.1




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