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Commit fed6cefe authored by Borislav Petkov's avatar Borislav Petkov Committed by Matt Fleming
Browse files

x86/efi: Add a "debug" option to the efi= cmdline 



... and hide the memory regions dump behind it. Make it default-off.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20141209095843.GA3990@pd.tnic


Acked-by: default avatarLaszlo Ersek <lersek@redhat.com>
Acked-by: default avatarDave Young <dyoung@redhat.com>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 552e19d8

Documentation/kernel-parameters.txt

+2 −1
Original line number Diff line number Diff line
@@ -1036,7 +1036,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			Format: {"off" | "on" | "skip[mbr]"}



	efi=		[EFI]

			Format: { "old_map", "nochunk", "noruntime" }

			Format: { "old_map", "nochunk", "noruntime", "debug" }

			old_map [X86-64]: switch to the old ioremap-based EFI

			runtime services mapping. 32-bit still uses this one by

			default.
@@ -1044,6 +1044,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
			boot stub, as chunking can cause problems with some

			firmware implementations.

			noruntime : disable EFI runtime services support

			debug: enable misc debug output



	efi_no_storage_paranoia [EFI; X86]

			Using this parameter you can use more than 50% of

arch/x86/platform/efi/efi.c

+4 −1
Original line number Diff line number Diff line
@@ -491,6 +491,7 @@ void __init efi_init(void) 
	if (efi_memmap_init())

		return;



	if (efi_enabled(EFI_DBG))

		print_efi_memmap();

}
@@ -939,6 +940,8 @@ static int __init arch_parse_efi_cmdline(char *str) 
{

	if (parse_option_str(str, "old_map"))

		set_bit(EFI_OLD_MEMMAP, &efi.flags);

	if (parse_option_str(str, "debug"))

		set_bit(EFI_DBG, &efi.flags);



	return 0;

}

include/linux/efi.h

+1 −0
Original line number Diff line number Diff line
@@ -942,6 +942,7 @@ extern int __init efi_setup_pcdp_console(char *); 
#define EFI_64BIT		5	/* Is the firmware 64-bit? */

#define EFI_PARAVIRT		6	/* Access is via a paravirt interface */

#define EFI_ARCH_1		7	/* First arch-specific bit */

#define EFI_DBG			8	/* Print additional debug info at runtime */



#ifdef CONFIG_EFI

/*