linux-kernel - [PATCH] [3/28] x86: MCE: Remove assumption that RIP MSR is exact

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Message-Id: <20090407150743.B95051D046D@basil.firstfloor.org>
Date:	Tue,  7 Apr 2009 17:07:43 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de
Subject: [PATCH] [3/28] x86: MCE: Remove assumption that RIP MSR is exact


Impact: Spec compliance

The code assumed that on P4 the extended RIP MSR would
be an exact error location But no P4s have exact EIPVs and also
on rereading the SDM doesn't claim that. So let's drop that.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:09:59.000000000 +0200
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:43:14.000000000 +0200
@@ -184,11 +184,8 @@
 		m->ip = 0;
 		m->cs = 0;
 	}
-	if (rip_msr) {
-		/* Assume the RIP in the MSR is exact. Is this true? */
-		m->mcgstatus |= MCG_STATUS_EIPV;
+	if (rip_msr)
 		rdmsrl(rip_msr, m->ip);
-	}
 }
 
 /*
--
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