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@xxxxxxx>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
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
