linux-kernel - [PATCH] x86/mce-inject: Reset struct after injection

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Message-Id: <20180905081954.10391-1-bp@alien8.de>
Date:   Wed,  5 Sep 2018 10:19:54 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     linux-edac <linux-edac@...r.kernel.org>
Cc:     Tony Luck <tony.luck@...el.com>,
        Yazen Ghannam <Yazen.Ghannam@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/mce-inject: Reset struct after injection

From: Borislav Petkov <bp@...e.de>

Clear the MCE struct which is used for collecting the injection details
after injection.

Also, populate it with more details from the machine.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/cpu/mcheck/mce-inject.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index c805a06e14c3..1fc424c40a31 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -108,6 +108,9 @@ static void setup_inj_struct(struct mce *m)
 	memset(m, 0, sizeof(struct mce));
 
 	m->cpuvendor = boot_cpu_data.x86_vendor;
+	m->time	     = ktime_get_real_seconds();
+	m->cpuid     = cpuid_eax(1);
+	m->microcode = boot_cpu_data.microcode;
 }
 
 /* Update fake mce registers on current CPU. */
@@ -576,6 +579,9 @@ static int inj_bank_set(void *data, u64 val)
 	m->bank = val;
 	do_inject();
 
+	/* Reset injection struct */
+	setup_inj_struct(&i_mce);
+
 	return 0;
 }
 
-- 
2.17.0.582.gccdcbd54c