Introduce the LIVEUPDATE_GUEST_MEMFD Kconfig option. This option enables live update support for KVM guest_memfd files, enabling guest_memfd-backed memory preservation across kernel upgrades.
Currently this support only guest_memfd files that are full-shared and pre-faulted. Signed-off-by: Tarun Sahu <[email protected]> --- kernel/liveupdate/Kconfig | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig index 1a8513f16ef7..0bbc4037192e 100644 --- a/kernel/liveupdate/Kconfig +++ b/kernel/liveupdate/Kconfig @@ -88,4 +88,19 @@ config LIVEUPDATE_MEMFD If unsure, say N. +config LIVEUPDATE_GUEST_MEMFD + bool "Live update support for guest_memfd" + depends on LIVEUPDATE + depends on KVM_GUEST_MEMFD + default LIVEUPDATE + help + Enable live update support for KVM guest_memfd files. This allows + preserving VM Memory backed by guest_memfd file across kernel live + updates. + + This can only be used for the guest_memfd that are fully-shared + and pre-faulted. + + If unsure, say N. + endmenu -- 2.54.0.563.g4f69b47b94-goog
