linux-kernel - [PATCH v3 6/6] KVM: arm64: Reload PMCNTENSET

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Message-Id: <20250312-pmc-v3-6-0411cab5dc3d@daynix.com>
Date: Wed, 12 Mar 2025 20:56:00 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 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>, 
 Andrew Jones <drjones@...hat.com>, Shannon Zhao <shannon.zhao@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, devel@...nix.com, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH v3 6/6] KVM: arm64: Reload PMCNTENSET_EL0

Disable counters that are no longer included in PMCNTENSET_EL0. It is
not necessary to enable counters included in PMCNTENSET_EL0 because
kvm_pmu_handle_pmcr() does so if appropriate.

Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
 arch/arm64/kvm/pmu-emul.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 2d19c6048091..b14655dda6db 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -831,6 +831,8 @@ void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu)
 {
 	u64 mask = kvm_pmu_valid_counter_mask(vcpu);
 
+	kvm_pmu_disable_counter_mask(vcpu, ~__vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
+
 	__vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= mask;
 	__vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= mask;
 	__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= mask;

-- 
2.48.1