[PATCH v5 04/20] KVM: arm/arm64: Guard kvm_vgic_map_is_active against !vgic_initialized

Christoffer Dall cdall at linaro.org
Fri Oct 27 01:34:25 PDT 2017


If the vgic is not initialized, don't try to grab its spinlocks or
traverse its data structures.

This is important because we soon have to start considering the active
state of a virtual interrupts when doing vcpu_load, which may happen
early on before the vgic is initialized.

Signed-off-by: Christoffer Dall <cdall at linaro.org>
Acked-by: Marc Zyngier <marc.zyngier at arm.com>
---
 virt/kvm/arm/vgic/vgic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index fed717e..e1f7dbc 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -777,6 +777,9 @@ bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq)
 	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, virt_irq);
 	bool map_is_active;
 
+	if (!vgic_initialized(vcpu->kvm))
+		return false;
+
 	spin_lock(&irq->irq_lock);
 	map_is_active = irq->hw && irq->active;
 	spin_unlock(&irq->irq_lock);
-- 
2.7.4




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