[PATCH 1/4] KVM: x86/pmu: Setup pmc->eventsel for fixed PMCs

From: Like Xu
Date: Tue Nov 16 2021 - 07:21:31 EST


From: Like Xu <likexu@xxxxxxxxxxx>

The current pmc->eventsel for fixed counter is underutilised. The
pmc->eventsel can be setup for all known available fixed counters
since we have mapping between fixed pmc index and
the intel_arch_events array.

Either gp or fixed counter, it will simplify the later checks for
consistency between eventsel and perf_hw_id.

Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
---
arch/x86/kvm/vmx/pmu_intel.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index b8e0d21b7c8a..51b00dbb2d1e 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -460,6 +460,21 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return 1;
}

+static void setup_fixed_pmc_eventsel(struct kvm_pmu *pmu)
+{
+ size_t size = ARRAY_SIZE(fixed_pmc_events);
+ struct kvm_pmc *pmc;
+ u32 event;
+ int i;
+
+ for (i = 0; i < pmu->nr_arch_fixed_counters; i++) {
+ pmc = &pmu->fixed_counters[i];
+ event = fixed_pmc_events[array_index_nospec(i, size)];
+ pmc->eventsel = (intel_arch_events[event].unit_mask << 8) |
+ intel_arch_events[event].eventsel;
+ }
+}
+
static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -507,6 +522,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
edx.split.bit_width_fixed, x86_pmu.bit_width_fixed);
pmu->counter_bitmask[KVM_PMC_FIXED] =
((u64)1 << edx.split.bit_width_fixed) - 1;
+ setup_fixed_pmc_eventsel(pmu);
}

pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) |
--
2.33.1