liveupdate: kho: move to kernel/liveupdate

Move KHO to kernel/liveupdate/ in preparation of placing all Live Update
core kernel related files to the same place.

[pasha.tatashin@soleen.com: disable the menu when DEFERRED_STRUCT_PAGE_INIT]
  Link: https://lkml.kernel.org/r/CA+CK2bAvh9Oa2SLfsbJ8zztpEjrgr_hr-uGgF1coy8yoibT39A@mail.gmail.com
Link: https://lkml.kernel.org/r/20251101142325.1326536-8-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

8 files changed, 48 insertions, 39 deletions

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index cc6743137946..15632358bcf7 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -94,40 +94,6 @@ 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
-	depends on !DEFERRED_STRUCT_PAGE_INIT
-	select MEMBLOCK_KHO_SCRATCH
-	select KEXEC_FILE
-	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 KEXEC_HANDOVER_DEBUG
-	bool "Enable Kexec Handover debug checks"
-	depends on KEXEC_HANDOVER
-	help
-	  This option enables extra sanity checks for the Kexec Handover
-	  subsystem. Since, KHO performance is crucial in live update
-	  scenarios and the extra code might be adding overhead it is
-	  only optionally enabled.
-
-config KEXEC_HANDOVER_DEBUGFS
-	bool "kexec handover debugfs interface"
-	default KEXEC_HANDOVER
-	depends on KEXEC_HANDOVER
-	select DEBUG_FS
-	help
-	  Allow to control kexec handover device tree via debugfs
-	  interface, i.e. finalize the state or aborting the finalization.
-	  Also, enables inspecting the KHO fdt trees with the debugfs binary
-	  blobs.
-
 config CRASH_DUMP
 	bool "kernel crash dumps"
 	default ARCH_DEFAULT_CRASH_DUMP
diff --git a/kernel/Makefile b/kernel/Makefile
index 2cf7909a74e5..e83669841b8c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -52,6 +52,7 @@ obj-y += printk/
 obj-y += irq/
 obj-y += rcu/
 obj-y += livepatch/
+obj-y += liveupdate/
 obj-y += dma/
 obj-y += entry/
 obj-y += unwind/
@@ -82,9 +83,6 @@ obj-$(CONFIG_CRASH_DUMP_KUNIT_TEST) += crash_core_test.o
 obj-$(CONFIG_KEXEC) += kexec.o
 obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
 obj-$(CONFIG_KEXEC_ELF) += kexec_elf.o
-obj-$(CONFIG_KEXEC_HANDOVER) += kexec_handover.o
-obj-$(CONFIG_KEXEC_HANDOVER_DEBUG) += kexec_handover_debug.o
-obj-$(CONFIG_KEXEC_HANDOVER_DEBUGFS) += kexec_handover_debugfs.o
 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
 obj-$(CONFIG_COMPAT) += compat.o
 obj-$(CONFIG_CGROUPS) += cgroup/
diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig
new file mode 100644
index 000000000000..eae428309332
--- /dev/null
+++ b/kernel/liveupdate/Kconfig
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+menu "Live Update and Kexec HandOver"
+	depends on !DEFERRED_STRUCT_PAGE_INIT
+
+config KEXEC_HANDOVER
+	bool "kexec handover"
+	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
+	depends on !DEFERRED_STRUCT_PAGE_INIT
+	select MEMBLOCK_KHO_SCRATCH
+	select KEXEC_FILE
+	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 KEXEC_HANDOVER_DEBUG
+	bool "Enable Kexec Handover debug checks"
+	depends on KEXEC_HANDOVER
+	help
+	  This option enables extra sanity checks for the Kexec Handover
+	  subsystem. Since, KHO performance is crucial in live update
+	  scenarios and the extra code might be adding overhead it is
+	  only optionally enabled.
+
+config KEXEC_HANDOVER_DEBUGFS
+	bool "kexec handover debugfs interface"
+	default KEXEC_HANDOVER
+	depends on KEXEC_HANDOVER
+	select DEBUG_FS
+	help
+	  Allow to control kexec handover device tree via debugfs
+	  interface, i.e. finalize the state or aborting the finalization.
+	  Also, enables inspecting the KHO fdt trees with the debugfs binary
+	  blobs.
+
+endmenu
diff --git a/kernel/liveupdate/Makefile b/kernel/liveupdate/Makefile
new file mode 100644
index 000000000000..f52ce1ebcf86
--- /dev/null
+++ b/kernel/liveupdate/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_KEXEC_HANDOVER)		+= kexec_handover.o
+obj-$(CONFIG_KEXEC_HANDOVER_DEBUG)	+= kexec_handover_debug.o
+obj-$(CONFIG_KEXEC_HANDOVER_DEBUGFS)	+= kexec_handover_debugfs.o
diff --git a/kernel/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index 0a4a058fbf0c..52cd4dc23e2a 100644
--- a/kernel/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c
@@ -26,8 +26,8 @@
  * KHO is tightly coupled with mm init and needs access to some of mm
  * internal APIs.
  */
-#include "../mm/internal.h"
-#include "kexec_internal.h"
+#include "../../mm/internal.h"
+#include "../kexec_internal.h"
 #include "kexec_handover_internal.h"
 
 #define KHO_FDT_COMPATIBLE "kho-v1"
diff --git a/kernel/kexec_handover_debug.c b/kernel/liveupdate/kexec_handover_debug.c
index 6efb696f5426..6efb696f5426 100644
--- a/kernel/kexec_handover_debug.c
+++ b/kernel/liveupdate/kexec_handover_debug.c
diff --git a/kernel/kexec_handover_debugfs.c b/kernel/liveupdate/kexec_handover_debugfs.c
index 46e9e6c0791f..46e9e6c0791f 100644
--- a/kernel/kexec_handover_debugfs.c
+++ b/kernel/liveupdate/kexec_handover_debugfs.c
diff --git a/kernel/kexec_handover_internal.h b/kernel/liveupdate/kexec_handover_internal.h
index 52ed73659fe6..52ed73659fe6 100644
--- a/kernel/kexec_handover_internal.h
+++ b/kernel/liveupdate/kexec_handover_internal.h