Booting as a guest under KVM results in error messages about
unchecked MSR access:
[ 6.814328][ T0] unchecked MSR access error: RDMSR from 0x17f at rIP: 0xffffffff84483f16 (mce_intel_feature_init+0x156/0x270)
because KVM doesn't provide emulation for random model specific registers.
Check for X86_FEATURE_HYPERVISOR and skip trying to enable the mode (a
guest shouldn't be concerned with corrected errors anyway).
Reported-by: Qian Cai <cai@xxxxxxxxxx>
Fixes: 68299a42f842 ("x86/mce: Enable additional error logging on certain Intel CPUs")
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
arch/x86/kernel/cpu/mce/intel.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
index b47883e364b4..7f7d863400b7 100644
--- a/arch/x86/kernel/cpu/mce/intel.c
+++ b/arch/x86/kernel/cpu/mce/intel.c
@@ -517,6 +517,9 @@ static void intel_imc_init(struct cpuinfo_x86 *c)
{
u64 error_control;
+ if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
+ return;
+
switch (c->x86_model) {
case INTEL_FAM6_SANDYBRIDGE_X:
case INTEL_FAM6_IVYBRIDGE_X:
--
2.21.1
