efi: libstub: Always enable initrd command line loader and bump version

In preparation for setting a cross-architecture baseline for EFI boot
support, remove the Kconfig option that permits the command line initrd
loader to be disabled. Also, bump the minor version so that any image
built with the new version can be identified as supporting this.

Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Author: ardbiesheuvel

drivers/firmware/efi/Kconfig

@@ -106,21 +106,6 @@ config EFI_ARMSTUB_DTB_LOADER
 	  functionality for bootloaders that do not have such support
 	  this option is necessary.
 
-config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER
-	bool "Enable the command line initrd loader" if !X86
-	depends on EFI_STUB && (EFI_GENERIC_STUB || X86)
-	default y if X86
-	help
-	  Select this config option to add support for the initrd= command
-	  line parameter, allowing an initrd to be loaded into memory that
-	  resides on a file system backed by an implementation of
-	  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.
-
-	  This method has been superseded by the simpler LoadFile2 based
-	  initrd loading method, but the initrd= loader is retained as it
-	  can be used from the UEFI Shell or other generic loaders that
-	  don't implement the Linux specific LoadFile2 method.
-
 config EFI_BOOTLOADER_CONTROL
 	tristate "EFI Bootloader Control"
 	select UCS2_STRING

drivers/firmware/efi/libstub/efi-stub-helper.c

@@ -538,8 +538,7 @@ efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
 				     unsigned long soft_limit,
 				     unsigned long hard_limit)
 {
-	if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) ||
-	    (IS_ENABLED(CONFIG_X86) && image == NULL))
+	if (image == NULL)
 		return EFI_UNSUPPORTED;
 
 	return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,

include/linux/pe.h

@@ -29,7 +29,7 @@
  * handover_offset and xloadflags fields in the bootparams structure.
  */
 #define LINUX_EFISTUB_MAJOR_VERSION		0x1
-#define LINUX_EFISTUB_MINOR_VERSION		0x0
+#define LINUX_EFISTUB_MINOR_VERSION		0x1
 
 #define MZ_MAGIC	0x5a4d	/* "MZ" */