diff mbox series

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

Message ID 20250320015551.2157511-12-changyuanl@google.com (mailing list archive)
State New
Headers show
Series kexec: introduce Kexec HandOver (KHO) | expand

Commit Message

Changyuan Lyu March 20, 2025, 1:55 a.m. UTC 
From: Alexander Graf <graf@amazon.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@amazon.com>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Co-developed-by: Changyuan Lyu <changyuanl@google.com>
Signed-off-by: Changyuan Lyu <changyuanl@google.com>
---
 kernel/Kconfig.kexec | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

Comments

Krzysztof Kozlowski March 20, 2025, 7:10 a.m. UTC | #1 
On 20/03/2025 02:55, Changyuan Lyu wrote:
> From: Alexander Graf <graf@amazon.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@amazon.com>
> Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> Co-developed-by: Changyuan Lyu <changyuanl@google.com>
> Signed-off-by: Changyuan Lyu <changyuanl@google.com>
What did you exactly co-develop here? Few changes does not mean you are
a co-developer.

Best regards,
Krzysztof
diff mbox series

Patch

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