From 767f4b620edadac579c9b8b6660761d4285fa6f9 Mon Sep 17 00:00:00 2001
From: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Date: Mon, 28 Jun 2021 12:27:40 -0500
Subject: [PATCH] EDAC/mce_amd: Do not load edac_mce_amd module on guests
Hypervisors likely do not expose the SMCA feature to the guest and
loading this module leads to false warnings. This module should not be
loaded in guests to begin with, but people tend to do so, especially
when testing kernels in VMs. And then they complain about those false
warnings.
Do the practical thing and do not load this module when running as a
guest to avoid all that complaining.
[ bp: Rewrite commit message. ]
Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Tested-by: Kim Phillips <kim.phillips@amd.com>
Link: https://lkml.kernel.org/r/20210628172740.245689-1-Smita.KoralahalliChannabasappa@amd.com
---
drivers/edac/mce_amd.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 27d56920b4690..67dbf4c312716 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -1246,6 +1246,9 @@ static int __init mce_amd_init(void)
c->x86_vendor != X86_VENDOR_HYGON)
return -ENODEV;
+ if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
+ return -ENODEV;
+
if (boot_cpu_has(X86_FEATURE_SMCA)) {
xec_mask = 0x3f;
goto out;