Patchwork [112/139] x86, efi: Make "noefi" really disable EFI runtime serivces

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Submitter Luis Henriques
Date Feb. 28, 2013, 2:44 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/224081/
State New
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Luis Henriques - Feb. 28, 2013, 2:44 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: Matt Fleming <>

commit fb834c7acc5e140cf4f9e86da93a66de8c0514da upstream.

commit 1de63d60cd5b ("efi: Clear EFI_RUNTIME_SERVICES rather than
EFI_BOOT by "noefi" boot parameter") attempted to make "noefi" true to
its documentation and disable EFI runtime services to prevent the
bricking bug described in commit e0094244e41c ("samsung-laptop:
Disable on EFI hardware"). However, it's not possible to clear
EFI_RUNTIME_SERVICES from an early param function because
EFI_RUNTIME_SERVICES is set in efi_init() *after* parse_early_param().

This resulted in "noefi" effectively becoming a no-op and no longer
providing users with a way to disable EFI, which is bad for those
users that have buggy machines.

Reported-by: Walt Nelson Jr <>
Cc: Satoru Takeuchi <>
Signed-off-by: Matt Fleming <>
Signed-off-by: H. Peter Anvin <>
Signed-off-by: Luis Henriques <>
 arch/x86/platform/efi/efi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)


diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 3705bb0..1e40637 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -84,9 +84,10 @@  int efi_enabled(int facility)
+static bool disable_runtime = false;
 static int __init setup_noefi(char *arg)
-	clear_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
+	disable_runtime = true;
 	return 0;
 early_param("noefi", setup_noefi);
@@ -733,7 +734,7 @@  void __init efi_init(void)
 	if (!efi_is_native())
 		pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 	else {
-		if (efi_runtime_init())
+		if (disable_runtime || efi_runtime_init())
 		set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);