On 6/8/2024 8:08 AM, Sean Christopherson wrote:
> Add a helper, intel_pmu_enable_fixed_counter_bits(), to dedup code that
> enables fixed counter bits, i.e. when KVM clears bits in the reserved mask
> used to detect invalid MSR_CORE_PERF_FIXED_CTR_CTRL values.
>
> No functional change intended.
>
> Cc: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
> arch/x86/kvm/vmx/pmu_intel.c | 22 ++++++++++++----------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
> index e01c87981927..fb5cbd6cbeff 100644
> --- a/arch/x86/kvm/vmx/pmu_intel.c
> +++ b/arch/x86/kvm/vmx/pmu_intel.c
> @@ -448,6 +448,14 @@ static __always_inline u64 intel_get_fixed_pmc_eventsel(unsigned int index)
> return eventsel;
> }
>
> +static void intel_pmu_enable_fixed_counter_bits(struct kvm_pmu *pmu, u64 bits)
> +{
> + int i;
> +
> + for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
> + pmu->fixed_ctr_ctrl_rsvd &= ~intel_fixed_bits_by_idx(i, bits);
> +}
> +
> static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
> {
> struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
> @@ -457,7 +465,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
> union cpuid10_edx edx;
> u64 perf_capabilities;
> u64 counter_rsvd;
> - int i;
>
> memset(&lbr_desc->records, 0, sizeof(lbr_desc->records));
>
> @@ -501,12 +508,9 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
> ((u64)1 << edx.split.bit_width_fixed) - 1;
> }
>
> - for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
> - pmu->fixed_ctr_ctrl_rsvd &=
> - ~intel_fixed_bits_by_idx(i,
> - INTEL_FIXED_0_KERNEL |
> - INTEL_FIXED_0_USER |
> - INTEL_FIXED_0_ENABLE_PMI);
> + intel_pmu_enable_fixed_counter_bits(pmu, INTEL_FIXED_0_KERNEL |
> + INTEL_FIXED_0_USER |
> + INTEL_FIXED_0_ENABLE_PMI);
>
> counter_rsvd = ~(((1ull << pmu->nr_arch_gp_counters) - 1) |
> (((1ull << pmu->nr_arch_fixed_counters) - 1) << KVM_FIXED_PMC_BASE_IDX));
> @@ -551,10 +555,8 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
> if (perf_capabilities & PERF_CAP_PEBS_BASELINE) {
> pmu->pebs_enable_rsvd = counter_rsvd;
> pmu->reserved_bits &= ~ICL_EVENTSEL_ADAPTIVE;
> - for (i = 0; i < pmu->nr_arch_fixed_counters; i++)
> - pmu->fixed_ctr_ctrl_rsvd &=
> - ~intel_fixed_bits_by_idx(i, ICL_FIXED_0_ADAPTIVE);
> pmu->pebs_data_cfg_rsvd = ~0xff00000full;
> + intel_pmu_enable_fixed_counter_bits(pmu, ICL_FIXED_0_ADAPTIVE);
> } else {
> pmu->pebs_enable_rsvd =
> ~((1ull << pmu->nr_arch_gp_counters) - 1);
>
> base-commit: b9adc10edd4e14e66db4f7289a88fdbfa45ae7a8
Reviewed-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
