[PATCH v2 6/6] KVM: arm64: vgic-v3: Indicate vgic_put_irq() may take LPI xarray lock

[Oliver Upton <oliver.upton@linux.dev>]

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 <maz@kernel.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/vgic/vgic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c
index a21b482844ce..3b247041a130 100644
--- a/arch/arm64/kvm/vgic/vgic.c
+++ b/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;
 
-- 
2.39.5