linux-kernel - [PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

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Date:   Tue,  6 Jul 2021 07:08:33 +0200
From:   Jack Wang <jinpu.wang@...os.com>
To:     linux-edac@...r.kernel.org
Cc:     yazen.ghannam@....com, bp@...en8.de, tony.luck@...el.com,
        mchehab@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

Similar to commit f0a029fff4a5 ("EDAC/Intel: Do not load EDAC driver when running as a guest")

There's little to no point in loading an EDAC driver running in a guest.

Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR
and simply return -ENODEV in the init routine.

Signed-off-by: Jack Wang <jinpu.wang@...os.com>
---
 drivers/edac/amd64_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index f0d8f60acee1..cdb14575ef31 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3942,6 +3942,9 @@ static int __init amd64_edac_init(void)
 	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
 		return -EBUSY;
 
+	if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
+		return -ENODEV;
+
 	if (!x86_match_cpu(amd64_cpuids))
 		return -ENODEV;
 
-- 
2.25.1