[PATCH v5 16/24] KVM: arm64: Account for partitioning in PMCR_EL0 access
From: Colton Lewis <hidden>
Date: 2025-12-09 20:52:45
Also in:
kvm, kvmarm, linux-doc, linux-kselftest, linux-perf-users, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Make sure reads and writes to PMCR_EL0 conform to additional constraints imposed when the PMU is partitioned. Signed-off-by: Colton Lewis <redacted> --- arch/arm64/kvm/pmu.c | 2 +- arch/arm64/kvm/sys_regs.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c
index 1fd012f8ff4a9..48b39f096fa12 100644
--- a/arch/arm64/kvm/pmu.c
+++ b/arch/arm64/kvm/pmu.c@@ -877,7 +877,7 @@ u64 kvm_pmu_accessible_counter_mask(struct kvm_vcpu *vcpu) u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu) { u64 pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0); - u64 n = vcpu->kvm->arch.nr_pmu_counters; + u64 n = kvm_pmu_guest_num_counters(vcpu); if (vcpu_has_nv(vcpu) && !vcpu_is_el2(vcpu)) n = FIELD_GET(MDCR_EL2_HPMN, __vcpu_sys_reg(vcpu, MDCR_EL2));
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 70104087b6c7b..f2ae761625a66 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -1360,7 +1360,7 @@ static int set_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, */ if (!kvm_vm_has_ran_once(kvm) && !vcpu_has_nv(vcpu) && - new_n <= kvm_arm_pmu_get_max_counters(kvm)) + new_n <= kvm_pmu_hpmn(vcpu)) kvm->arch.nr_pmu_counters = new_n; mutex_unlock(&kvm->arch.config_lock);
--
2.52.0.239.gd5f0c6e74e-goog