# SPDX-License-Identifier: GPL-2.0-only menu "Live Update and Kexec HandOver" config KEXEC_HANDOVER	bool "kexec handover"	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE	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 KEXEC_HANDOVER_ENABLE_DEFAULT	bool "Enable kexec handover by default"	depends on KEXEC_HANDOVER	help	  Enable Kexec Handover by default. This avoids the need to	  explicitly pass 'kho=on' on the kernel command line. 	  This is useful for systems where KHO is a prerequisite for other	  features, such as Live Update, ensuring the mechanism is always	  active. 	  The default behavior can still be overridden at boot time by	  passing 'kho=off'. config LIVEUPDATE	bool "Live Update Orchestrator"	depends on KEXEC_HANDOVER	help	  Enable the Live Update Orchestrator. Live Update is a mechanism,	  typically based on kexec, that allows the kernel to be updated	  while keeping selected devices operational across the transition.	  These devices are intended to be reclaimed by the new kernel and	  re-attached to their original workload without requiring a device	  reset. 	  Ability to handover a device from current to the next kernel depends	  on specific support within device drivers and related kernel	  subsystems. 	  This feature primarily targets virtual machine hosts to quickly update	  the kernel hypervisor with minimal disruption to the running virtual	  machines. 	  If unsure, say N. config LIVEUPDATE_MEMFD	bool "Live update support for memfd"	depends on LIVEUPDATE	depends on MEMFD_CREATE	depends on SHMEM	default LIVEUPDATE	help	  Enable live update support for memfd regions. This allows preserving	  memfd-backed memory across kernel live updates. 	  This can be used to back VM memory with memfds, allowing the guest	  memory to persist, or for other user workloads needing to preserve	  pages. 	  If unsure, say N. endmenu