lkml.org 
[lkml]   [2024]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[RFC PATCH 27/41] KVM: x86/pmu: Clear PERF_METRICS MSR for guest
    Date
    From: Dapeng Mi <dapeng1.mi@linux.intel.com>

    Since perf topdown metrics feature is not supported yet, clear
    PERF_METRICS MSR for guest.

    Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
    ---
    arch/x86/kvm/vmx/pmu_intel.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
    index 4b4da7f17895..ad0434646a29 100644
    --- a/arch/x86/kvm/vmx/pmu_intel.c
    +++ b/arch/x86/kvm/vmx/pmu_intel.c
    @@ -916,6 +916,10 @@ static void intel_restore_pmu_context(struct kvm_vcpu *vcpu)
    */
    for (i = pmu->nr_arch_fixed_counters; i < kvm_pmu_cap.num_counters_fixed; i++)
    wrmsrl(MSR_CORE_PERF_FIXED_CTR0 + i, 0);
    +
    + /* Clear PERF_METRICS MSR since guest topdown metrics is not supported yet. */
    + if (kvm_caps.host_perf_cap & PMU_CAP_PERF_METRICS)
    + wrmsrl(MSR_PERF_METRICS, 0);
    }

    struct kvm_pmu_ops intel_pmu_ops __initdata = {
    --
    2.34.1

    \
     
     \ /
      Last update: 2024-05-27 14:34    [W:5.549 / U:0.432 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site