KVM: arm64: vgic-v3: Indicate vgic_put_irq() may take LPI xarray lock

The release path on LPIs is quite rare, meaning it can be difficult to
find lock ordering bugs on the LPI xarray's spinlock. Tell lockdep that
vgic_put_irq() might acquire the xa_lock to make unsafe patterns more
obvious.

Reviewed-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

Author: oupton

arch/arm64/kvm/vgic/vgic.c

@@ -142,6 +142,9 @@ void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
 {
 	struct vgic_dist *dist = &kvm->arch.vgic;
 
+	if (irq->intid >= VGIC_MIN_LPI)
+		might_lock(&dist->lpi_xa.xa_lock);
+
 	if (!__vgic_put_irq(kvm, irq))
 		return;