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[RFC,v2,03/19] KVM: arm/arm64: Guard kvm_vgic_map_is_active against !vgic_initialized

Message ID 20170717142718.13853-4-cdall@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Christoffer Dall July 17, 2017, 2:27 p.m. UTC 
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@linaro.org>
---
 virt/kvm/arm/vgic/vgic.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

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);