diff options
| author | Oliver Upton <oliver.upton@linux.dev> | 2025-09-05 03:05:31 -0700 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2025-09-10 02:56:20 -0700 |
| commit | 13bba09beb5ffa1a4f307c48576c09d5c69f4c31 (patch) | |
| tree | 665acd96b2f95323be585880c7409665c3be2f8a | |
| parent | 982f31bbb5b0adc79a9126c0f970e7801c6e8342 (diff) | |
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 <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>
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; |