linux-kernel - [PATCH 02/10] xen/mce: Change the machine check point

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Date:	Fri, 23 Dec 2011 10:24:29 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
CC:	"Jiang, Yunhong" <yunhong.jiang@...el.com>,
	"jeremy.fitzhardinge@...rix.com" <jeremy.fitzhardinge@...rix.com>,
	"Shan, Haitao" <haitao.shan@...el.com>,
	"Zhao, Yakui" <yakui.zhao@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/10] xen/mce: Change the machine check point

>From 80221e743d1a693670d701f383da26c8e5d5bf98 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@...el.com>
Date: Wed, 7 Dec 2011 05:26:16 +0800
Subject: [PATCH 02/10] xen/mce: Change the machine check point

This patch backport from Jeremy's pvops commit
073349667402682c997394b3fcdbbeb6707f368f

Enable MCE support in dom0, so that if a MCE happen and that MCE impact
dom0, dom0 can receive a vMCE.

Signed-off-by: Liu, Jinsong <jinsong.liu@...el.com>
Signed-off-by: Ke, Liping <liping.ke@...el.com>
Signed-off-by: Jiang, Yunhong <yunhong.jiang@...el.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/enlighten.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b073e4c..13e7a16 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -526,7 +526,7 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
 	 * Look for known traps using IST, and substitute them
 	 * appropriately.  The debugger ones are the only ones we care
 	 * about.  Xen will handle faults like double_fault and
-	 * machine_check, so we should never see them.  Warn if
+	 * nmi, so we should never see them.  Warn if
 	 * there's an unexpected IST-using fault handler.
 	 */
 	if (addr == (unsigned long)debug)
@@ -541,7 +541,10 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
 		return 0;
 #ifdef CONFIG_X86_MCE
 	} else if (addr == (unsigned long)machine_check) {
-		return 0;
+		if (xen_initial_domain())
+			addr = (unsigned long)machine_check;
+		else
+			return 0;
 #endif
 	} else {
 		/* Some other trap using IST? */
-- 
1.6.5.6

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