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From: Alexander Graf <graf@amazon.com>
To: <linux-kernel@vger.kernel.org>
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Subject: [PATCH v3 06/17] kexec: Add config option for KHO
Date: Wed, 17 Jan 2024 14:46:53 +0000
Message-ID: <20240117144704.602-7-graf@amazon.com>
In-Reply-To: <20240117144704.602-1-graf@amazon.com>
References: <20240117144704.602-1-graf@amazon.com>
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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@amazon.com>
---
 kernel/Kconfig.kexec | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 946dffa048b7..6fb5a6ae9697 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -93,6 +93,19 @@ 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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