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Diffstat (limited to 'virt/kvm/arm/pmu.c')
-rw-r--r--virt/kvm/arm/pmu.c117
1 files changed, 81 insertions, 36 deletions
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 4b43e7f..fc8a723 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -203,6 +203,24 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
return reg;
}
+static void kvm_pmu_check_overflow(struct kvm_vcpu *vcpu)
+{
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
+ bool overflow = !!kvm_pmu_overflow_status(vcpu);
+
+ if (pmu->irq_level == overflow)
+ return;
+
+ pmu->irq_level = overflow;
+
+ if (likely(irqchip_in_kernel(vcpu->kvm))) {
+ int ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+ pmu->irq_num, overflow,
+ &vcpu->arch.pmu);
+ WARN_ON(ret);
+ }
+}
+
/**
* kvm_pmu_overflow_set - set PMU overflow interrupt
* @vcpu: The vcpu pointer
@@ -210,37 +228,18 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
*/
void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val)
{
- u64 reg;
-
if (val == 0)
return;
vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= val;
- reg = kvm_pmu_overflow_status(vcpu);
- if (reg != 0)
- kvm_vcpu_kick(vcpu);
+ kvm_pmu_check_overflow(vcpu);
}
static void kvm_pmu_update_state(struct kvm_vcpu *vcpu)
{
- struct kvm_pmu *pmu = &vcpu->arch.pmu;
- bool overflow;
-
if (!kvm_arm_pmu_v3_ready(vcpu))
return;
-
- overflow = !!kvm_pmu_overflow_status(vcpu);
- if (pmu->irq_level == overflow)
- return;
-
- pmu->irq_level = overflow;
-
- if (likely(irqchip_in_kernel(vcpu->kvm))) {
- int ret;
- ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
- pmu->irq_num, overflow);
- WARN_ON(ret);
- }
+ kvm_pmu_check_overflow(vcpu);
}
bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
@@ -451,34 +450,74 @@ bool kvm_arm_support_pmu_v3(void)
return (perf_num_counters() > 0);
}
-static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
+int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
{
- if (!kvm_arm_support_pmu_v3())
- return -ENODEV;
+ if (!vcpu->arch.pmu.created)
+ return 0;
/*
- * We currently require an in-kernel VGIC to use the PMU emulation,
- * because we do not support forwarding PMU overflow interrupts to
- * userspace yet.
+ * A valid interrupt configuration for the PMU is either to have a
+ * properly configured interrupt number and using an in-kernel
+ * irqchip, or to not have an in-kernel GIC and not set an IRQ.
*/
- if (!irqchip_in_kernel(vcpu->kvm) || !vgic_initialized(vcpu->kvm))
+ if (irqchip_in_kernel(vcpu->kvm)) {
+ int irq = vcpu->arch.pmu.irq_num;
+ if (!kvm_arm_pmu_irq_initialized(vcpu))
+ return -EINVAL;
+
+ /*
+ * If we are using an in-kernel vgic, at this point we know
+ * the vgic will be initialized, so we can check the PMU irq
+ * number against the dimensions of the vgic and make sure
+ * it's valid.
+ */
+ if (!irq_is_ppi(irq) && !vgic_valid_spi(vcpu->kvm, irq))
+ return -EINVAL;
+ } else if (kvm_arm_pmu_irq_initialized(vcpu)) {
+ return -EINVAL;
+ }
+
+ kvm_pmu_vcpu_reset(vcpu);
+ vcpu->arch.pmu.ready = true;
+
+ return 0;
+}
+
+static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_arm_support_pmu_v3())
return -ENODEV;
- if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features) ||
- !kvm_arm_pmu_irq_initialized(vcpu))
+ if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENXIO;
- if (kvm_arm_pmu_v3_ready(vcpu))
+ if (vcpu->arch.pmu.created)
return -EBUSY;
- kvm_pmu_vcpu_reset(vcpu);
- vcpu->arch.pmu.ready = true;
+ if (irqchip_in_kernel(vcpu->kvm)) {
+ int ret;
+
+ /*
+ * If using the PMU with an in-kernel virtual GIC
+ * implementation, we require the GIC to be already
+ * initialized when initializing the PMU.
+ */
+ if (!vgic_initialized(vcpu->kvm))
+ return -ENODEV;
+
+ if (!kvm_arm_pmu_irq_initialized(vcpu))
+ return -ENXIO;
+ ret = kvm_vgic_set_owner(vcpu, vcpu->arch.pmu.irq_num,
+ &vcpu->arch.pmu);
+ if (ret)
+ return ret;
+ }
+
+ vcpu->arch.pmu.created = true;
return 0;
}
-#define irq_is_ppi(irq) ((irq) >= VGIC_NR_SGIS && (irq) < VGIC_NR_PRIVATE_IRQS)
-
/*
* For one VM the interrupt type must be same for each vcpu.
* As a PPI, the interrupt number is the same for all vcpus,
@@ -512,6 +551,9 @@ int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
int __user *uaddr = (int __user *)(long)attr->addr;
int irq;
+ if (!irqchip_in_kernel(vcpu->kvm))
+ return -EINVAL;
+
if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENODEV;
@@ -519,7 +561,7 @@ int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
return -EFAULT;
/* The PMU overflow interrupt can be a PPI or a valid SPI. */
- if (!(irq_is_ppi(irq) || vgic_valid_spi(vcpu->kvm, irq)))
+ if (!(irq_is_ppi(irq) || irq_is_spi(irq)))
return -EINVAL;
if (!pmu_irq_is_valid(vcpu->kvm, irq))
@@ -546,6 +588,9 @@ int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
int __user *uaddr = (int __user *)(long)attr->addr;
int irq;
+ if (!irqchip_in_kernel(vcpu->kvm))
+ return -EINVAL;
+
if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features))
return -ENODEV;
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