linux-kernel - [PATCH 07/18] KVM: arm64: Remap PMUv3 events onto hardware

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Message-Id: <20241217212048.3709204-8-oliver.upton@linux.dev>
Date: Tue, 17 Dec 2024 13:20:37 -0800
From: Oliver Upton <oliver.upton@...ux.dev>
To: kvmarm@...ts.linux.dev
Cc: Marc Zyngier <maz@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Mingwei Zhang <mizhang@...gle.com>,
	Colton Lewis <coltonlewis@...gle.com>,
	Raghavendra Rao Ananta <rananta@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Oliver Upton <oliver.upton@...ux.dev>
Subject: [PATCH 07/18] KVM: arm64: Remap PMUv3 events onto hardware

Use the provided helper to map PMUv3 event IDs onto hardware, if the
driver exposes such a helper. This is expected to be quite rare, and
only useful for non-PMUv3 hardware.

Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
---
 arch/arm64/kvm/pmu-emul.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 7f20da32266e..6d7fc0051ad8 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -692,6 +692,18 @@ static bool kvm_pmc_counts_at_el2(struct kvm_pmc *pmc)
 	return kvm_pmc_read_evtreg(pmc) & ARMV8_PMU_INCLUDE_EL2;
 }
 
+static u64 kvm_map_pmu_event(struct kvm *kvm, u64 eventsel)
+{
+	struct arm_pmu *pmu = kvm->arch.arm_pmu;
+	int hw_event;
+
+	if (!pmu->map_pmuv3_event)
+		return eventsel;
+
+	hw_event = pmu->map_pmuv3_event(eventsel);
+	return (hw_event < 0) ? eventsel : hw_event;
+}
+
 /**
  * kvm_pmu_create_perf_event - create a perf event for a counter
  * @pmc: Counter context
@@ -730,13 +742,13 @@ static void kvm_pmu_create_perf_event(struct kvm_pmc *pmc)
 
 	memset(&attr, 0, sizeof(struct perf_event_attr));
 	attr.type = arm_pmu->pmu.type;
+	attr.config = kvm_map_pmu_event(vcpu->kvm, eventsel);
 	attr.size = sizeof(attr);
 	attr.pinned = 1;
 	attr.disabled = !kvm_pmu_counter_is_enabled(pmc);
 	attr.exclude_user = !kvm_pmc_counts_at_el0(pmc);
 	attr.exclude_hv = 1; /* Don't count EL2 events */
 	attr.exclude_host = 1; /* Don't count host events */
-	attr.config = eventsel;
 
 	/*
 	 * Filter events at EL1 (i.e. vEL2) when in a hyp context based on the
-- 
2.39.5