From: Raghavendra Rao Ananta <rananta@google.com>
To: Oliver Upton <oliver.upton@linux.dev>, Marc Zyngier <maz@kernel.org>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Shaoqin Huang <shahuang@redhat.com>,
Jing Zhang <jingzhangos@google.com>,
Reiji Watanabe <reijiw@google.com>,
Colton Lewis <coltonlewis@google.com>,
Raghavendra Rao Anata <rananta@google.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH v7 06/12] KVM: arm64: PMU: Add a helper to read the number of counters
Date: Mon, 9 Oct 2023 23:08:52 +0000 [thread overview]
Message-ID: <20231009230858.3444834-7-rananta@google.com> (raw)
In-Reply-To: <20231009230858.3444834-1-rananta@google.com>
Add a helper, kvm_arm_get_num_counters(), to read the number
of counters from the arm_pmu associated to the VM. Make the
function global as upcoming patches will be interested to
know the value while setting the PMCR.N of the guest from
userspace.
Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
arch/arm64/kvm/pmu-emul.c | 17 +++++++++++++++++
include/kvm/arm_pmu.h | 6 ++++++
2 files changed, 23 insertions(+)
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index a161d6266a5c..84aa8efd9163 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -873,6 +873,23 @@ static bool pmu_irq_is_valid(struct kvm *kvm, int irq)
return true;
}
+/**
+ * kvm_arm_get_num_counters - Get the number of general-purpose PMU counters.
+ * @kvm: The kvm pointer
+ */
+int kvm_arm_get_num_counters(struct kvm *kvm)
+{
+ struct arm_pmu *arm_pmu = kvm->arch.arm_pmu;
+
+ lockdep_assert_held(&kvm->arch.config_lock);
+
+ /*
+ * The arm_pmu->num_events considers the cycle counter as well.
+ * Ignore that and return only the general-purpose counters.
+ */
+ return arm_pmu->num_events - 1;
+}
+
static void kvm_arm_set_pmu(struct kvm *kvm, struct arm_pmu *arm_pmu)
{
lockdep_assert_held(&kvm->arch.config_lock);
diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h
index cd980d78b86b..672f3e9d7eea 100644
--- a/include/kvm/arm_pmu.h
+++ b/include/kvm/arm_pmu.h
@@ -102,6 +102,7 @@ void kvm_vcpu_pmu_resync_el0(void);
u8 kvm_arm_pmu_get_pmuver_limit(void);
int kvm_arm_set_default_pmu(struct kvm *kvm);
+int kvm_arm_get_num_counters(struct kvm *kvm);
u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu);
#else
@@ -181,6 +182,11 @@ static inline int kvm_arm_set_default_pmu(struct kvm *kvm)
return -ENODEV;
}
+static inline int kvm_arm_get_num_counters(struct kvm *kvm)
+{
+ return -ENODEV;
+}
+
static inline u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu)
{
return 0;
--
2.42.0.609.gbb76f46606-goog
next prev parent reply other threads:[~2023-10-09 23:12 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-09 23:08 [PATCH v7 00/12] KVM: arm64: PMU: Allow userspace to limit the number of PMCs on vCPU Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 01/12] KVM: arm64: PMU: Introduce helpers to set the guest's PMU Raghavendra Rao Ananta
2023-10-16 19:45 ` Eric Auger
2023-10-09 23:08 ` [PATCH v7 02/12] KVM: arm64: PMU: Set the default PMU for the guest before vCPU reset Raghavendra Rao Ananta
2023-10-10 22:25 ` Oliver Upton
2023-10-13 20:27 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 03/12] KVM: arm64: PMU: Clear PM{C,I}NTEN{SET,CLR} and PMOVS{SET,CLR} on " Raghavendra Rao Ananta
2023-10-16 19:44 ` Eric Auger
2023-10-16 21:28 ` Raghavendra Rao Ananta
2023-10-17 9:23 ` Eric Auger
2023-10-17 16:59 ` Raghavendra Rao Ananta
2023-10-18 21:16 ` Raghavendra Rao Ananta
2023-10-18 22:17 ` Oliver Upton
2023-10-19 18:46 ` Raghavendra Rao Ananta
2023-10-19 19:05 ` Oliver Upton
2023-10-19 20:17 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 04/12] KVM: arm64: PMU: Don't define the sysreg reset() for PM{USERENR,CCFILTR}_EL0 Raghavendra Rao Ananta
2023-10-16 19:47 ` Eric Auger
2023-10-09 23:08 ` [PATCH v7 05/12] KVM: arm64: PMU: Add a helper to read a vCPU's PMCR_EL0 Raghavendra Rao Ananta
2023-10-16 20:02 ` Eric Auger
2023-10-09 23:08 ` Raghavendra Rao Ananta [this message]
2023-10-10 22:30 ` [PATCH v7 06/12] KVM: arm64: PMU: Add a helper to read the number of counters Oliver Upton
2023-10-13 5:43 ` Oliver Upton
2023-10-13 20:24 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 07/12] KVM: arm64: PMU: Set PMCR_EL0.N for vCPU based on the associated PMU Raghavendra Rao Ananta
2023-10-16 13:35 ` Sebastian Ott
2023-10-16 19:02 ` Raghavendra Rao Ananta
2023-10-16 19:15 ` Oliver Upton
2023-10-16 21:35 ` Raghavendra Rao Ananta
2023-10-17 5:52 ` Oliver Upton
2023-10-17 5:55 ` Oliver Upton
2023-10-17 16:58 ` Raghavendra Rao Ananta
2023-10-17 17:09 ` Oliver Upton
2023-10-17 17:25 ` Raghavendra Rao Ananta
2023-10-17 18:10 ` Oliver Upton
2023-10-17 18:45 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 08/12] KVM: arm64: PMU: Allow userspace to limit PMCR_EL0.N for the guest Raghavendra Rao Ananta
2023-10-17 15:52 ` Sebastian Ott
2023-10-17 16:49 ` Raghavendra Rao Ananta
2023-10-19 10:45 ` Sebastian Ott
2023-10-19 18:05 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 09/12] tools: Import arm_pmuv3.h Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 10/12] KVM: selftests: aarch64: Introduce vpmu_counter_access test Raghavendra Rao Ananta
2023-10-12 11:24 ` Sebastian Ott
2023-10-12 15:01 ` Sebastian Ott
2023-10-13 21:05 ` Raghavendra Rao Ananta
2023-10-16 10:01 ` Sebastian Ott
2023-10-16 18:56 ` Oliver Upton
2023-10-16 19:05 ` Raghavendra Rao Ananta
2023-10-16 19:07 ` Oliver Upton
2023-10-17 14:51 ` Eric Auger
2023-10-17 17:07 ` Raghavendra Rao Ananta
2023-10-17 15:48 ` Sebastian Ott
2023-10-17 17:10 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 11/12] KVM: selftests: aarch64: vPMU register test for implemented counters Raghavendra Rao Ananta
2023-10-17 18:54 ` Eric Auger
2023-10-17 21:42 ` Raghavendra Rao Ananta
2023-10-09 23:08 ` [PATCH v7 12/12] KVM: selftests: aarch64: vPMU register test for unimplemented counters Raghavendra Rao Ananta
2023-10-18 6:54 ` Eric Auger
2023-10-19 18:09 ` Raghavendra Rao Ananta
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