linux-kernel - [PATCH] x86/MCE: Get microcode revision from cpu_info instead of boot_cpu

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Date:   Fri,  1 Jun 2018 13:30:26 +0200
From:   Filippo Sironi <sironi@...zon.de>
To:     sironi@...zon.de, tony.luck@...el.com, bp@...en8.de,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86/MCE: Get microcode revision from cpu_info instead of boot_cpu_data

Commit fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check
records") extended MCE entries to report the microcode revision taken
from boot_cpu_data. Unfortunately, boot_cpu_data isn't updated on late
microcode loading, thus making MCE entries slightly incorrect.
Use cpu_info instead, which is updated on late microcode loading.

Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
Signed-off-by: Filippo Sironi <sironi@...zon.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: linux-edac@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/kernel/cpu/mcheck/mce.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 42cf2880d0ed..4be323f9b390 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -134,7 +134,7 @@ void mce_setup(struct mce *m)
 	if (this_cpu_has(X86_FEATURE_INTEL_PPIN))
 		rdmsrl(MSR_PPIN, m->ppin);
 
-	m->microcode = boot_cpu_data.microcode;
+	m->microcode = cpu_data(m->extcpu).microcode;
 }
 
 DEFINE_PER_CPU(struct mce, injectm);
-- 
2.7.4