[PATCH v8 18/20] KVM: ARM64: Reset PMU state when resetting vcpu

[Shannon Zhao]

From: Shannon Zhao <shannon.zhao at linaro.org>

When resetting vcpu, it needs to reset the PMU state to initial status.

Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
---
 arch/arm64/kvm/reset.c |  3 +++
 include/kvm/arm_pmu.h  |  2 ++
 virt/kvm/arm/pmu.c     | 17 +++++++++++++++++
 3 files changed, 22 insertions(+)

diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index f34745c..dfbce78 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -120,6 +120,9 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
 	/* Reset system registers */
 	kvm_reset_sys_regs(vcpu);
 
+	/* Reset PMU */
+	kvm_pmu_vcpu_reset(vcpu);
+
 	/* Reset timer */
 	return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
 }
diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h
index 136f4e3..51dd2d1 100644
--- a/include/kvm/arm_pmu.h
+++ b/include/kvm/arm_pmu.h
@@ -37,6 +37,7 @@ struct kvm_pmu {
 
 u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx);
 u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu);
+void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu);
 void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, u64 val);
 void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, u64 val);
 void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val);
@@ -57,6 +58,7 @@ u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
 {
 	return 0;
 }
+void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {}
 void kvm_pmu_disable_counter(struct kvm_vcpu *vcpu, u64 val) {}
 void kvm_pmu_enable_counter(struct kvm_vcpu *vcpu, u64 val) {}
 void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val) {}
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index e28df0f..e6aac73 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -68,6 +68,23 @@ static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc)
 	}
 }
 
+/**
+ * kvm_pmu_vcpu_reset - reset pmu state for cpu
+ * @vcpu: The vcpu pointer
+ *
+ */
+void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+	for (i = 0; i < ARMV8_MAX_COUNTERS; i++) {
+		kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
+		pmu->pmc[i].idx = i;
+		pmu->pmc[i].bitmask = 0xffffffffUL;
+	}
+}
+
 u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
 {
 	u64 val = vcpu_sys_reg(vcpu, PMCR_EL0) >> ARMV8_PMCR_N_SHIFT;
-- 
2.0.4