linux-kernel - [PATCH 1/8] x86/mce/AMD: Use msr_stat when clearing MCA

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Date:   Tue, 13 Jun 2017 18:28:28 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/8] x86/mce/AMD: Use msr_stat when clearing MCA_STATUS

From: Yazen Ghannam <yazen.ghannam@....com>

The value of MCA_STATUS is used as the MSR when clearing MCA_STATUS.

This may cause the following warning:
 unchecked MSR access error: WRMSR to 0x11b (tried to write 0x0000000000000000)
 Call Trace:
  <IRQ>
  ? amd_threshold_interrupt+0x209/0x220
  smp_threshold_interrupt+0x1b/0x40
  threshold_interrupt+0x89/0x90

Use msr_stat instead which has the MSR address.

Fixes: 37d43acfd79f ("x86/mce/AMD: Redo error logging from APIC LVT interrupt handlers")
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: x86-ml <x86@...nel.org>
Link: http://lkml.kernel.org/r/1495658507-7413-1-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index d00f299f2ada..d11f94e8e68a 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -815,7 +815,7 @@ _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
 
 	__log_error(bank, status, addr, misc);
 
-	wrmsrl(status, 0);
+	wrmsrl(msr_stat, 0);
 
 	return status & MCI_STATUS_DEFERRED;
 }
-- 
2.13.0