[PATCH v2] platform/x86: intel-uncore-freq: Prevent driver loading in guests

[PATCH v2] platform/x86: intel-uncore-freq: Prevent driver loading in guests

[Srinivas Pandruvada]

Loading this driver in guests results in unchecked MSR access error for
MSR 0x620.

There is no use of reading and modifying package/die scope uncore MSRs
in guests. So check for CPU feature X86_FEATURE_HYPERVISOR to prevent
loading of this driver in guests.

Fixes: dbce412a7733 ("platform/x86/intel-uncore-freq: Split common and enumeration part")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215870
Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2
	Add Fixes tag

 drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c
index c61f804dd44e..8f9c571d7257 100644
--- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c
+++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c
@@ -212,6 +212,9 @@ static int __init intel_uncore_init(void)
 	const struct x86_cpu_id *id;
 	int ret;
 
+	if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
+		return -ENODEV;
+
 	id = x86_match_cpu(intel_uncore_cpu_ids);
 	if (!id)
 		return -ENODEV;
-- 
2.31.1