linux-kernel - [PATCH] EDAC/mce_amd: Do not load edac_mce

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Date:   Mon, 28 Jun 2021 12:27:40 -0500
From:   Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To:     x86@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Robert Richter <rric@...nel.org>, Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>, yazen.ghannam@....com,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Subject: [PATCH] EDAC/mce_amd: Do not load edac_mce_amd module on guests

Hypervisors may not expose SMCA feature to the guest.

Check for X86_FEATURE_HYPERVISOR on entry in mce_amd_init() and return
-ENODEV if set.

Suggested-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....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 5dd905a3f30c..1a1629166aa3 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -1176,6 +1176,9 @@ 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;
-- 
2.17.1