linux-kernel - [PATCH v4 15/18] KVM: arm64: nv: Honor MDCR

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Message-ID: <20241025182354.3364124-16-oliver.upton@linux.dev>
Date: Fri, 25 Oct 2024 18:23:50 +0000
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>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Oliver Upton <oliver.upton@...ux.dev>
Subject: [PATCH v4 15/18] KVM: arm64: nv: Honor MDCR_EL2.HPME

When the PMU is configured with split counter ranges, HPME becomes the
enable bit for the counters reserved for EL2.

Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
---
 arch/arm64/kvm/pmu-emul.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 03cd1ad7a55a..349886f03fd5 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -620,8 +620,15 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
 static bool kvm_pmu_counter_is_enabled(struct kvm_pmc *pmc)
 {
 	struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc);
-	return (kvm_vcpu_read_pmcr(vcpu) & ARMV8_PMU_PMCR_E) &&
-	       (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(pmc->idx));
+	unsigned int mdcr = __vcpu_sys_reg(vcpu, MDCR_EL2);
+
+	if (!(__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(pmc->idx)))
+		return false;
+
+	if (kvm_pmu_counter_is_hyp(vcpu, pmc->idx))
+		return mdcr & MDCR_EL2_HPME;
+
+	return kvm_vcpu_read_pmcr(vcpu) & ARMV8_PMU_PMCR_E;
 }
 
 static bool kvm_pmc_counts_at_el0(struct kvm_pmc *pmc)
-- 
2.47.0.163.g1226f6d8fa-goog