Commit 8dfac4d8 authored by Ard Biesheuvel's avatar Ard Biesheuvel
Browse files

efi: runtime-maps: Clarify purpose and enable by default for kexec 



The current Kconfig logic for CONFIG_EFI_RUNTIME_MAPS does not convey
that without it, a kexec kernel is not able to boot in EFI mode at all.
So clarify this, and make the option only configurable via the menu
system if CONFIG_EXPERT is set.

Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Reviewed-by: default avatarDave Young <dyoung@redhat.com>
parent 36d5786a

drivers/firmware/efi/Kconfig

+6 −6
Original line number Diff line number Diff line
@@ -27,13 +27,13 @@ config EFI_VARS_PSTORE_DEFAULT_DISABLE 
	  using the efivars module's pstore_disable parameter.



config EFI_RUNTIME_MAP

	bool "Export efi runtime maps to sysfs"

	depends on X86 && EFI && KEXEC_CORE

	default y

	bool "Export EFI runtime maps to sysfs" if EXPERT

	depends on X86 && EFI

	default KEXEC_CORE

	help

	  Export efi runtime memory maps to /sys/firmware/efi/runtime-map.

	  That memory map is used for example by kexec to set up efi virtual

	  mapping the 2nd kernel, but can also be used for debugging purposes.

	  Export EFI runtime memory regions to /sys/firmware/efi/runtime-map.

	  That memory map is required by the 2nd kernel to set up EFI virtual

	  mappings after kexec, but can also be used for debugging purposes.



	  See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.