linux-kernel - [PATCH v2 06/12] KVM: x86/pmu: Use only the uniformly exported interface reprogram

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Date:   Wed,  2 Mar 2022 19:13:28 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jim Mattson <jmattson@...gle.com>, kvm@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        Like Xu <likexu@...cent.com>
Subject: [PATCH v2 06/12] KVM: x86/pmu: Use only the uniformly exported interface reprogram_counter()

From: Like Xu <likexu@...cent.com>

Since reprogram_counter(), reprogram_{gp, fixed}_counter() currently have
the same incoming parameter "struct kvm_pmc *pmc", the callers can simplify
the conetxt by using uniformly exported interface, which makes reprogram_
{gp, fixed}_counter() static and eliminates EXPORT_SYMBOL_GPL.

Signed-off-by: Like Xu <likexu@...cent.com>
---
 arch/x86/kvm/pmu.c           | 6 ++----
 arch/x86/kvm/pmu.h           | 2 --
 arch/x86/kvm/svm/pmu.c       | 2 +-
 arch/x86/kvm/vmx/pmu_intel.c | 4 ++--
 4 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 282e6e859c46..5299488b002c 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -215,7 +215,7 @@ static bool check_pmu_event_filter(struct kvm_pmc *pmc)
 	return allow_event;
 }
 
-void reprogram_gp_counter(struct kvm_pmc *pmc)
+static void reprogram_gp_counter(struct kvm_pmc *pmc)
 {
 	u64 config;
 	u32 type = PERF_TYPE_RAW;
@@ -258,9 +258,8 @@ void reprogram_gp_counter(struct kvm_pmc *pmc)
 			      (eventsel & HSW_IN_TX),
 			      (eventsel & HSW_IN_TX_CHECKPOINTED));
 }
-EXPORT_SYMBOL_GPL(reprogram_gp_counter);
 
-void reprogram_fixed_counter(struct kvm_pmc *pmc)
+static void reprogram_fixed_counter(struct kvm_pmc *pmc)
 {
 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
 	int idx = pmc->idx - INTEL_PMC_IDX_FIXED;
@@ -288,7 +287,6 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc)
 			      !(en_field & 0x1), /* exclude kernel */
 			      pmi, false, false);
 }
-EXPORT_SYMBOL_GPL(reprogram_fixed_counter);
 
 void reprogram_counter(struct kvm_pmc *pmc)
 {
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 70a982c3cdad..201b99628423 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -140,8 +140,6 @@ static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value)
 	return sample_period;
 }
 
-void reprogram_gp_counter(struct kvm_pmc *pmc);
-void reprogram_fixed_counter(struct kvm_pmc *pmc);
 void reprogram_counter(struct kvm_pmc *pmc);
 
 void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 7ff9ccaca0a4..a18bf636fbce 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -266,7 +266,7 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 			return 0;
 		if (!(data & pmu->reserved_bits)) {
 			pmc->eventsel = data;
-			reprogram_gp_counter(pmc);
+			reprogram_counter(pmc);
 			return 0;
 		}
 	}
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 3ddbfdd16cd0..19b78a9d9d47 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -52,7 +52,7 @@ static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data)
 		pmc = get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + i);
 
 		__set_bit(INTEL_PMC_IDX_FIXED + i, pmu->pmc_in_use);
-		reprogram_fixed_counter(pmc);
+		reprogram_counter(pmc);
 	}
 }
 
@@ -449,7 +449,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 				return 0;
 			if (!(data & pmu->reserved_bits)) {
 				pmc->eventsel = data;
-				reprogram_gp_counter(pmc);
+				reprogram_counter(pmc);
 				return 0;
 			}
 		} else if (intel_pmu_handle_lbr_msrs_access(vcpu, msr_info, false))
-- 
2.35.1