linux-kernel - [PATCH v3 05/11] KVM: x86/pmu: Drop "u64 eventsel" for reprogram_gp

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Message-Id: <20220411093537.11558-6-likexu@tencent.com>
Date:   Mon, 11 Apr 2022 17:35:31 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Like Xu <likexu@...cent.com>
Subject: [PATCH v3 05/11] KVM: x86/pmu: Drop "u64 eventsel" for reprogram_gp_counter()

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

Because inside reprogram_gp_counter() it is bound to assign the requested
eventel to pmc->eventsel, this assignment step can be moved forward, thus
simplifying the passing of parameters to "struct kvm_pmc *pmc" only.

No functional change intended.

Signed-off-by: Like Xu <likexu@...cent.com>
---
 arch/x86/kvm/pmu.c           | 7 +++----
 arch/x86/kvm/pmu.h           | 2 +-
 arch/x86/kvm/svm/pmu.c       | 6 ++++--
 arch/x86/kvm/vmx/pmu_intel.c | 3 ++-
 4 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 51035bd29511..419f44847520 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -240,17 +240,16 @@ static bool check_pmu_event_filter(struct kvm_pmc *pmc)
 	return allow_event;
 }
 
-void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
+void reprogram_gp_counter(struct kvm_pmc *pmc)
 {
 	u64 config;
 	u32 type = PERF_TYPE_RAW;
 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
+	u64 eventsel = pmc->eventsel;
 
 	if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL)
 		printk_once("kvm pmu: pin control bit is ignored\n");
 
-	pmc->eventsel = eventsel;
-
 	pmc_pause_counter(pmc);
 
 	if (!(eventsel & ARCH_PERFMON_EVENTSEL_ENABLE) || !pmc_is_enabled(pmc))
@@ -315,7 +314,7 @@ EXPORT_SYMBOL_GPL(reprogram_fixed_counter);
 void reprogram_counter(struct kvm_pmc *pmc)
 {
 	if (pmc_is_gp(pmc))
-		reprogram_gp_counter(pmc, pmc->eventsel);
+		reprogram_gp_counter(pmc);
 	else {
 		int idx = pmc->idx - INTEL_PMC_IDX_FIXED;
 		u8 ctrl = fixed_ctrl_field(pmc_to_pmu(pmc)->fixed_ctr_ctrl, idx);
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index dbcac971babb..5ec34b940fa1 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -135,7 +135,7 @@ static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value)
 	return sample_period;
 }
 
-void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
+void reprogram_gp_counter(struct kvm_pmc *pmc);
 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
 void reprogram_counter(struct kvm_pmc *pmc);
 
diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c
index 57ab4739eb19..2794a29b3f54 100644
--- a/arch/x86/kvm/svm/pmu.c
+++ b/arch/x86/kvm/svm/pmu.c
@@ -263,8 +263,10 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	pmc = get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
 	if (pmc) {
 		data &= ~pmu->reserved_bits;
-		if (data != pmc->eventsel)
-			reprogram_gp_counter(pmc, data);
+		if (data != pmc->eventsel) {
+			pmc->eventsel = data;
+			reprogram_gp_counter(pmc);
+		}
 		return 0;
 	}
 
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 2feff54e2e45..3bf8a22ea2e5 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -453,7 +453,8 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 			    (pmu->raw_event_mask & HSW_IN_TX_CHECKPOINTED))
 				reserved_bits ^= HSW_IN_TX_CHECKPOINTED;
 			if (!(data & reserved_bits)) {
-				reprogram_gp_counter(pmc, data);
+				pmc->eventsel = data;
+				reprogram_gp_counter(pmc);
 				return 0;
 			}
 		} else if (intel_pmu_handle_lbr_msrs_access(vcpu, msr_info, false))
-- 
2.35.1