linux-kernel - [PATCHv3 4/5] x86/efi: enable runtime call flag checking

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Date:	Mon, 25 Apr 2016 14:46:33 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	linux-efi@...r.kernel.org
Cc:	ard.biesheuvel@...aro.org, catalin.marinas@....com, hpa@...or.com,
	leif.lindholm@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux@....linux.org.uk, linux-kernel@...r.kernel.org,
	mark.rutland@....com, matt@...eblueprint.co.uk, mingo@...hat.com,
	tglx@...utronix.de, will.deacon@....com
Subject: [PATCHv3 4/5] x86/efi: enable runtime call flag checking

Define ARCH_EFI_IRQ_FLAGS_MASK for x86, which will enable the generic
runtime wrapper code to detect when firmware erroneously modifies flags
over a runtime services function call.

For x86 (both 32-bit and 64-bit), we only need check the interrupt flag.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/efi.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 34bd38b..c6d8ad1 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -3,6 +3,7 @@
 
 #include <asm/fpu/api.h>
 #include <asm/pgtable.h>
+#include <asm/processor-flags.h>
 #include <asm/tlb.h>
 
 /*
@@ -28,8 +29,9 @@
 
 #define MAX_CMDLINE_ADDRESS	UINT_MAX
 
-#ifdef CONFIG_X86_32
+#define ARCH_EFI_IRQ_FLAGS_MASK	X86_EFLAGS_IF
 
+#ifdef CONFIG_X86_32
 
 extern unsigned long asmlinkage efi_call_phys(void *, ...);
 
-- 
1.9.1