linux-kernel - [PATCH -v3 2/2] x86, MCE, fix MSR_IA32_MCI

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <1274160991-21887-2-git-send-email-ying.huang@intel.com>
Date:	Tue, 18 May 2010 13:36:30 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, ying.huang@...el.com,
	andi@...stfloor.org, Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: [PATCH -v3 2/2] x86, MCE, fix MSR_IA32_MCI_CTL2 CMCI threshold setup

It is reported that CMCI is not raised when number of corrected error
reaches preset threshold. After inspection, it is found that
MSR_IA32_MCI_CTL2 threshold field is not setup properly. This patch
fixed it.

Value of MCI_CTL2_CMCI_THRESHOLD_MASK is fixed according to x86_64
Software Developer's Manual too.

Reported-by: Shaohui Zheng <shaohui.zheng@...el.com>
Signed-off-by: Huang Ying <ying.huang@...el.com>
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 arch/x86/include/asm/mce.h             |    2 +-
 arch/x86/kernel/cpu/mcheck/mce_intel.c |    1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -40,7 +40,7 @@
 
 /* CTL2 register defines */
 #define MCI_CTL2_CMCI_EN		(1ULL << 30)
-#define MCI_CTL2_CMCI_THRESHOLD_MASK	0xffffULL
+#define MCI_CTL2_CMCI_THRESHOLD_MASK	0x7fffULL
 
 #define MCJ_CTX_MASK		3
 #define MCJ_CTX(flags)		((flags) & MCJ_CTX_MASK)
--- a/arch/x86/kernel/cpu/mcheck/mce_intel.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_intel.c
@@ -102,6 +102,7 @@ static void cmci_discover(int banks, int
 			continue;
 		}
 
+		val &= ~MCI_CTL2_CMCI_THRESHOLD_MASK;
 		val |= MCI_CTL2_CMCI_EN | CMCI_THRESHOLD;
 		wrmsrl(MSR_IA32_MCx_CTL2(i), val);
 		rdmsrl(MSR_IA32_MCx_CTL2(i), val);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/