[PATCH 5.4] KVM: x86/pmu: Refactoring find_arch_event() to pmc_perf_hw_id()

[PATCH 5.4] KVM: x86/pmu: Refactoring find_arch_event() to pmc_perf_hw_id()

[Kyle Huey]

From: Like Xu <likexu@tencent.com>

[ Upstream commit 7c174f305cbee6bdba5018aae02b84369e7ab995 ]

The find_arch_event() returns a "unsigned int" value,
which is used by the pmc_reprogram_counter() to
program a PERF_TYPE_HARDWARE type perf_event.

The returned value is actually the kernel defined generic
perf_hw_id, let's rename it to pmc_perf_hw_id() with simpler
incoming parameters for better self-explanation.

Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20211130074221.93635-3-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[Backport to 5.4: kvm_x86_ops is a pointer here]
Signed-off-by: Kyle Huey <me@kylehuey.com>]
---
 arch/x86/kvm/pmu.c           | 8 +-------
 arch/x86/kvm/pmu.h           | 3 +--
 arch/x86/kvm/pmu_amd.c       | 8 ++++----
 arch/x86/kvm/vmx/pmu_intel.c | 9 +++++----
 4 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index e0e3776059af..32561431acde 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -143,7 +143,6 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
 {
 	unsigned config, type = PERF_TYPE_RAW;
-	u8 event_select, unit_mask;
 	struct kvm *kvm = pmc->vcpu->kvm;
 	struct kvm_pmu_event_filter *filter;
 	int i;
@@ -175,17 +174,12 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
 	if (!allow_event)
 		return;
 
-	event_select = eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
-	unit_mask = (eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
-
 	if (!(eventsel & (ARCH_PERFMON_EVENTSEL_EDGE |
 			  ARCH_PERFMON_EVENTSEL_INV |
 			  ARCH_PERFMON_EVENTSEL_CMASK |
 			  HSW_IN_TX |
 			  HSW_IN_TX_CHECKPOINTED))) {
-		config = kvm_x86_ops->pmu_ops->find_arch_event(pmc_to_pmu(pmc),
-						      event_select,
-						      unit_mask);
+		config = kvm_x86_ops->pmu_ops->pmc_perf_hw_id(pmc);
 		if (config != PERF_COUNT_HW_MAX)
 			type = PERF_TYPE_HARDWARE;
 	}
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 3fc98afd72a8..b63859e340e4 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -22,8 +22,7 @@ struct kvm_event_hw_type_mapping {
 };
 
 struct kvm_pmu_ops {
-	unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
-				    u8 unit_mask);
+	unsigned int (*pmc_perf_hw_id)(struct kvm_pmc *pmc);
 	unsigned (*find_fixed_event)(int idx);
 	bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
 	struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
diff --git a/arch/x86/kvm/pmu_amd.c b/arch/x86/kvm/pmu_amd.c
index 6bc656abbe66..f843c6bbcd31 100644
--- a/arch/x86/kvm/pmu_amd.c
+++ b/arch/x86/kvm/pmu_amd.c
@@ -126,10 +126,10 @@ static inline struct kvm_pmc *get_gp_pmc_amd(struct kvm_pmu *pmu, u32 msr,
 	return &pmu->gp_counters[msr_to_index(msr)];
 }
 
-static unsigned amd_find_arch_event(struct kvm_pmu *pmu,
-				    u8 event_select,
-				    u8 unit_mask)
+static unsigned int amd_pmc_perf_hw_id(struct kvm_pmc *pmc)
 {
+	u8 event_select = pmc->eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
+	u8 unit_mask = (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(amd_event_mapping); i++)
@@ -300,7 +300,7 @@ static void amd_pmu_reset(struct kvm_vcpu *vcpu)
 }
 
 struct kvm_pmu_ops amd_pmu_ops = {
-	.find_arch_event = amd_find_arch_event,
+	.pmc_perf_hw_id = amd_pmc_perf_hw_id,
 	.find_fixed_event = amd_find_fixed_event,
 	.pmc_is_enabled = amd_pmc_is_enabled,
 	.pmc_idx_to_pmc = amd_pmc_idx_to_pmc,
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 181e352d38de..395566018ba9 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -64,10 +64,11 @@ static void global_ctrl_changed(struct kvm_pmu *pmu, u64 data)
 		reprogram_counter(pmu, bit);
 }
 
-static unsigned intel_find_arch_event(struct kvm_pmu *pmu,
-				      u8 event_select,
-				      u8 unit_mask)
+static unsigned int intel_pmc_perf_hw_id(struct kvm_pmc *pmc)
 {
+	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
+	u8 event_select = pmc->eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
+	u8 unit_mask = (pmc->eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(intel_arch_events); i++)
@@ -374,7 +375,7 @@ static void intel_pmu_reset(struct kvm_vcpu *vcpu)
 }
 
 struct kvm_pmu_ops intel_pmu_ops = {
-	.find_arch_event = intel_find_arch_event,
+	.pmc_perf_hw_id = intel_pmc_perf_hw_id,
 	.find_fixed_event = intel_find_fixed_event,
 	.pmc_is_enabled = intel_pmc_is_enabled,
 	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
-- 
2.36.0

Re: [PATCH 5.4] KVM: x86/pmu: Refactoring find_arch_event() to pmc_perf_hw_id()

[Greg KH]

On Tue, May 10, 2022 at 08:58:14AM -0700, Kyle Huey wrote:
> From: Like Xu <likexu@tencent.com>
> 
> [ Upstream commit 7c174f305cbee6bdba5018aae02b84369e7ab995 ]
> 
> The find_arch_event() returns a "unsigned int" value,
> which is used by the pmc_reprogram_counter() to
> program a PERF_TYPE_HARDWARE type perf_event.
> 
> The returned value is actually the kernel defined generic
> perf_hw_id, let's rename it to pmc_perf_hw_id() with simpler
> incoming parameters for better self-explanation.
> 
> Signed-off-by: Like Xu <likexu@tencent.com>
> Message-Id: <20211130074221.93635-3-likexu@tencent.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> [Backport to 5.4: kvm_x86_ops is a pointer here]
> Signed-off-by: Kyle Huey <me@kylehuey.com>]
> ---
>  arch/x86/kvm/pmu.c           | 8 +-------
>  arch/x86/kvm/pmu.h           | 3 +--
>  arch/x86/kvm/pmu_amd.c       | 8 ++++----
>  arch/x86/kvm/vmx/pmu_intel.c | 9 +++++----
>  4 files changed, 11 insertions(+), 17 deletions(-)

Now queued up, thanks.

greg k-h