linux-kernel - [PATCH 05/10] MCE: Mask out address mask bits below address granuality

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Date:	Thu, 09 Jun 2011 14:33:42 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>, "Borislav Petkov" <bp@...64.org>
Cc:	linux-kernel@...r.kernel.org, "Huang, Ying" <ying.huang@...el.com>,
	"Hidetoshi Seto" <seto.hidetoshi@...fujitsu.com>,
	"Avi Kivity" <avi@...hat.com>
Subject: [PATCH 05/10] MCE: Mask out address mask bits below address granuality

From: Andi Kleen <andi@...stfloor.org>

SER enabled systems report the address granuality for each
reported address in a machine check. But the bits below
the granuality are undefined. Mask them out before
logging the machine check.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/mcheck/mce.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 0349e87..ffc8d11 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -539,8 +539,18 @@ static void mce_read_aux(struct mce *m, int i)
 {
 	if (m->status & MCI_STATUS_MISCV)
 		m->misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
-	if (m->status & MCI_STATUS_ADDRV)
+	if (m->status & MCI_STATUS_ADDRV) {
 		m->addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
+
+		/*
+		 * Mask the reported address by the reported granuality.
+		 */
+		if (mce_ser && (m->status & MCI_STATUS_MISCV)) {
+			u8 shift = m->misc & 0x1f;
+			m->addr >>= shift;
+			m->addr <<= shift;
+		}
+	}
 }
 
 DEFINE_PER_CPU(unsigned, mce_poll_count);
-- 
1.7.3.1

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