diff options
| -rw-r--r-- | arch/arm64/kvm/pmu-emul.c | 25 | ||||
| -rw-r--r-- | include/kvm/arm_pmu.h | 5 |
2 files changed, 28 insertions, 2 deletions
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index b238b3d5515c..7bab73f85b58 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -7,6 +7,7 @@ #include <linux/cpu.h> #include <linux/kvm.h> #include <linux/kvm_host.h> +#include <linux/list.h> #include <linux/perf_event.h> #include <linux/perf/arm_pmu.h> #include <linux/uaccess.h> @@ -16,6 +17,9 @@ DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); +static LIST_HEAD(arm_pmus); +static DEFINE_MUTEX(arm_pmus_lock); + static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx); static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx); static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc); @@ -750,9 +754,26 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, void kvm_host_pmu_init(struct arm_pmu *pmu) { - if (pmu->pmuver != 0 && pmu->pmuver != ID_AA64DFR0_PMUVER_IMP_DEF && - !kvm_arm_support_pmu_v3() && !is_protected_kvm_enabled()) + struct arm_pmu_entry *entry; + + if (pmu->pmuver == 0 || pmu->pmuver == ID_AA64DFR0_PMUVER_IMP_DEF || + is_protected_kvm_enabled()) + return; + + mutex_lock(&arm_pmus_lock); + + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + goto out_unlock; + + entry->arm_pmu = pmu; + list_add_tail(&entry->entry, &arm_pmus); + + if (list_is_singular(&arm_pmus)) static_branch_enable(&kvm_arm_pmu_available); + +out_unlock: + mutex_unlock(&arm_pmus_lock); } static struct arm_pmu *kvm_pmu_probe_armpmu(void) diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index f9ed4c171d7b..20193416d214 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -29,6 +29,11 @@ struct kvm_pmu { struct irq_work overflow_work; }; +struct arm_pmu_entry { + struct list_head entry; + struct arm_pmu *arm_pmu; +}; + DECLARE_STATIC_KEY_FALSE(kvm_arm_pmu_available); static __always_inline bool kvm_arm_support_pmu_v3(void) |