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    Subject[PATCH 3.12 69/77] intel_pstate: Add X86_FEATURE_APERFMPERF to cpu match parameters.
    Date
    3.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Dirk Brandewie <dirk.j.brandewie@intel.com>

    commit 6cbd7ee10e2842a3d1f9b60abede1c8f3d1f1130 upstream.

    KVM environments do not support APERF/MPERF MSRs. intel_pstate cannot
    operate without these registers.

    The previous validity checks in intel_pstate_msrs_not_valid() are
    insufficent in nested KVMs.

    References: https://bugzilla.redhat.com/show_bug.cgi?id=1046317
    Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/cpufreq/intel_pstate.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/cpufreq/intel_pstate.c
    +++ b/drivers/cpufreq/intel_pstate.c
    @@ -518,7 +518,8 @@ static void intel_pstate_timer_func(unsi
    }

    #define ICPU(model, policy) \
    - { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&policy }
    + { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
    + (unsigned long)&policy }

    static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
    ICPU(0x2a, default_policy),



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