linux-kernel - [PATCH v5 11/16] kexec: add config option for KHO

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Message-ID: <20250320015551.2157511-12-changyuanl@google.com>
Date: Wed, 19 Mar 2025 18:55:46 -0700
From: Changyuan Lyu <changyuanl@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: graf@...zon.com, akpm@...ux-foundation.org, luto@...nel.org, 
	anthony.yznaga@...cle.com, arnd@...db.de, ashish.kalra@....com, 
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	thomas.lendacky@....com, usama.arif@...edance.com, will@...nel.org, 
	devicetree@...r.kernel.org, kexec@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, 
	linux-mm@...ck.org, x86@...nel.org, Changyuan Lyu <changyuanl@...gle.com>
Subject: [PATCH v5 11/16] kexec: add config option for KHO

From: Alexander Graf <graf@...zon.com>

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>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Co-developed-by: Changyuan Lyu <changyuanl@...gle.com>
Signed-off-by: Changyuan Lyu <changyuanl@...gle.com>
---
 kernel/Kconfig.kexec | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 4d111f871951..57db99e758a8 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -95,6 +95,21 @@ config KEXEC_JUMP
 	  Jump between original kernel and kexeced kernel and invoke
 	  code in physical address mode via KEXEC
 
+config KEXEC_HANDOVER
+	bool "kexec handover"
+	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
+	select MEMBLOCK_KHO_SCRATCH
+	select KEXEC_FILE
+	select DEBUG_FS
+	select LIBFDT
+	select CMA
+	select XXHASH
+	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"
 	default ARCH_DEFAULT_CRASH_DUMP
-- 
2.48.1.711.g2feabab25a-goog