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From: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
To: x86@kernel.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Robert Richter <rric@kernel.org>, Tony Luck <tony.luck@intel.com>,
	James Morse <james.morse@arm.com>,
	yazen.ghannam@amd.com,
	Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Subject: [PATCH] EDAC/mce_amd: Do not load edac_mce_amd module on guests
Date: Mon, 28 Jun 2021 12:27:40 -0500	[thread overview]
Message-ID: <20210628172740.245689-1-Smita.KoralahalliChannabasappa@amd.com> (raw)

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@suse.de>
Signed-off-by: Smita Koralahalli <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 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


             reply	other threads:[~2021-06-28 17:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 17:27 Smita Koralahalli [this message]
2021-07-08 20:41 ` Yazen Ghannam
2021-07-23 18:18 ` Kim Phillips
2021-08-09 10:44 ` Borislav Petkov

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