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

[Changyuan Lyu]

From: Alexander Graf <graf@xxxxxxxxxx>

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@xxxxxxxxxx>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Co-developed-by: Changyuan Lyu <changyuanl@xxxxxxxxxx>
Signed-off-by: Changyuan Lyu <changyuanl@xxxxxxxxxx>
---
 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