From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Provide an accurate number of available PMU counters to userspace when
setting up a Realm.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
arch/arm64/include/asm/kvm_rme.h | 1 +
arch/arm64/kvm/pmu-emul.c | 3 +++
arch/arm64/kvm/rme.c | 5 +++++
3 files changed, 9 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h
index f8e37907e2d5..7839ef81c20e 100644
--- a/arch/arm64/include/asm/kvm_rme.h
+++ b/arch/arm64/include/asm/kvm_rme.h
@@ -84,6 +84,7 @@ struct realm_rec {
void kvm_init_rme(void);
u32 kvm_realm_ipa_limit(void);
u32 kvm_realm_vgic_nr_lr(void);
+u8 kvm_realm_max_pmu_counters(void);
u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val);
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index 5628b573ca41..f201f86ed7c8 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -1016,6 +1016,9 @@ u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm)
{
struct arm_pmu *arm_pmu = kvm->arch.arm_pmu;
+ if (kvm_is_realm(kvm))
+ return kvm_realm_max_pmu_counters();
+
/*
* The arm_pmu->cntr_mask considers the fixed counter(s) as well.
* Ignore those and return only the general-purpose counters.
diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c
index d77754ce8d14..1230550e2a71 100644
--- a/arch/arm64/kvm/rme.c
+++ b/arch/arm64/kvm/rme.c
@@ -63,6 +63,11 @@ u32 kvm_realm_vgic_nr_lr(void)
return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_GICV3_NUM_LRS);
}
+u8 kvm_realm_max_pmu_counters(void)
+{
+ return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_PMU_NUM_CTRS);
+}
+
u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val)
{
u32 bps = u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_NUM_BPS);
--
2.43.0
