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

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

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20141209095843.GA3990@pd.tnic
Acked-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2015-02-05 11:44:41 +01:00 committed by Matt Fleming
parent 552e19d876
commit fed6cefe3b
3 changed files with 7 additions and 2 deletions
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3
Documentation/kernel-parameters.txt
View File

@ -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

5
arch/x86/platform/efi/efi.c
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@ -491,7 +491,8 @@ void __init efi_init(void)
if (efi_memmap_init())
return;
print_efi_memmap();
if (efi_enabled(EFI_DBG))
print_efi_memmap();
}
void __init efi_late_init(void)
@ -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;
}

1
include/linux/efi.h
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@ -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
/*