linux-kernel - [PATCH] x86, cpufeature: add feature bit for SDBG

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Date:	Sun, 19 Jul 2015 20:26:43 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Mathias Krause <minipli@...glemail.com>,
	Borislav Petkov <bp@...en8.de>
Subject: [PATCH] x86, cpufeature: add feature bit for SDBG

Add a CPUID feature bit for the SDBG (Silicon Debug) CPU feature found
on recent Intel systems starting with Haswell.

Using the IA32_DEBUG_INTERFACE MSR (index C80H) one can at least detect
if SDBG has been enabled by the firmware and if it has been used or not.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/cpufeature.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3d6606fb97d0..4b11974b4ea7 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -119,6 +119,7 @@
 #define X86_FEATURE_TM2		( 4*32+ 8) /* Thermal Monitor 2 */
 #define X86_FEATURE_SSSE3	( 4*32+ 9) /* Supplemental SSE-3 */
 #define X86_FEATURE_CID		( 4*32+10) /* Context ID */
+#define X86_FEATURE_SDBG	( 4*32+11) /* Silicon Debug */
 #define X86_FEATURE_FMA		( 4*32+12) /* Fused multiply-add */
 #define X86_FEATURE_CX16	( 4*32+13) /* CMPXCHG16B */
 #define X86_FEATURE_XTPR	( 4*32+14) /* Send Task Priority Messages */
-- 
1.7.10.4

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