linux-kernel - [PATCH 6/8] x86/mce/mce-inject: Preset the MCE injection struct

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Date:   Tue, 13 Jun 2017 18:28:33 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/8] x86/mce/mce-inject: Preset the MCE injection struct

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

Populate the MCE injection struct before doing initial injection so that
values which don't change have sane defaults.

Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Yazen Ghannam <yazen.ghannam@....com>
Tested-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mcheck/mce-inject.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index 00af8dd8fc59..231ad23b24a9 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -103,6 +103,13 @@ DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");
 DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");
 DEFINE_SIMPLE_ATTRIBUTE(synd_fops, inj_synd_get, inj_synd_set, "%llx\n");
 
+static void setup_inj_struct(struct mce *m)
+{
+	memset(m, 0, sizeof(struct mce));
+
+	m->cpuvendor = boot_cpu_data.x86_vendor;
+}
+
 /* Update fake mce registers on current CPU. */
 static void inject_mce(struct mce *m)
 {
@@ -700,6 +707,8 @@ static int __init inject_init(void)
 	register_nmi_handler(NMI_LOCAL, mce_raise_notify, 0, "mce_notify");
 	mce_register_injector_chain(&inject_nb);
 
+	setup_inj_struct(&i_mce);
+
 	pr_info("Machine check injector initialized\n");
 
 	return 0;
-- 
2.13.0