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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: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Ard Biesheuvel 2022-11-07 08:42:08 +01:00
parent 36d5786a1c
commit 8dfac4d8ad
1 changed files with 6 additions and 6 deletions
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12
drivers/firmware/efi/Kconfig
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@ -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.