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

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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>
Link: https://lore.kernel.org/r/20250905100531.282980-7-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2025-09-05 03:05:31 -07:00
parent 982f31bbb5
commit 13bba09beb
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kvm/vgic/vgic.c
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@ -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;