KVM: arm64: Require in-kernel irqchip for PMU support

[cascardo/linux.git] / virt / kvm / arm / pmu.c

diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index a027569..6e9c40e 100644 (file)
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -423,6 +423,14 @@ static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
        if (!kvm_arm_support_pmu_v3())
                return -ENODEV;
 
+       /*
+        * We currently require an in-kernel VGIC to use the PMU emulation,
+        * because we do not support forwarding PMU overflow interrupts to
+        * userspace yet.
+        */
+       if (!irqchip_in_kernel(vcpu->kvm) || !vgic_initialized(vcpu->kvm))
+               return -ENODEV;
+
        if (!test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features) ||
            !kvm_arm_pmu_irq_initialized(vcpu))
                return -ENXIO;