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    Subject[PATCH v3 05/19] x86/mce: WARN once if IA32_FEATURE_CONTROL MSR is left unlocked
    Date
    WARN if the IA32_FEATURE_CONTROL MSR is somehow left unlocked now that
    CPU initialization unconditionally locks the MSR.

    Reviewed-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    ---
    arch/x86/kernel/cpu/mce/intel.c | 7 +++----
    1 file changed, 3 insertions(+), 4 deletions(-)

    diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
    index 3e5b29acd301..5abc55a67fce 100644
    --- a/arch/x86/kernel/cpu/mce/intel.c
    +++ b/arch/x86/kernel/cpu/mce/intel.c
    @@ -119,11 +119,10 @@ static bool lmce_supported(void)
    * generate a #GP fault.
    */
    rdmsrl(MSR_IA32_FEATURE_CONTROL, tmp);
    - if ((tmp & (FEAT_CTL_LOCKED | FEAT_CTL_LMCE_ENABLED)) ==
    - (FEAT_CTL_LOCKED | FEAT_CTL_LMCE_ENABLED))
    - return true;
    + if (WARN_ON_ONCE(!(tmp & FEAT_CTL_LOCKED)))
    + return false;

    - return false;
    + return tmp & FEAT_CTL_LMCE_ENABLED;
    }

    bool mce_intel_cmci_poll(void)
    --
    2.24.0
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