Our LPI translation cache needs to be able to drop the refcount on an LPI whilst already holding the lpi_list_lock.
Let's add a new primitive for this. Tested-by: Andre Przywara <[email protected]> Reviewed-by: Eric Auger <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> --- virt/kvm/arm/vgic/vgic.c | 26 +++++++++++++++++--------- virt/kvm/arm/vgic/vgic.h | 1 + 2 files changed, 18 insertions(+), 9 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 13d4b38a94ec..846bb680fd45 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -119,6 +119,22 @@ static void vgic_irq_release(struct kref *ref) { } +/* + * Drop the refcount on the LPI. Must be called with lpi_list_lock held. + */ +void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq) +{ + struct vgic_dist *dist = &kvm->arch.vgic; + + if (!kref_put(&irq->refcount, vgic_irq_release)) + return; + + list_del(&irq->lpi_list); + dist->lpi_list_count--; + + kfree(irq); +} + void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq) { struct vgic_dist *dist = &kvm->arch.vgic; @@ -128,16 +144,8 @@ void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq) return; raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); - if (!kref_put(&irq->refcount, vgic_irq_release)) { - raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); - return; - }; - - list_del(&irq->lpi_list); - dist->lpi_list_count--; + __vgic_put_lpi_locked(kvm, irq); raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); - - kfree(irq); } void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu) diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index a25b790ffa4e..8e9413e317b8 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -161,6 +161,7 @@ vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev, gpa_t addr, int len); struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 intid); +void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq); void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq); bool vgic_get_phys_line_level(struct vgic_irq *irq); void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending); -- 2.20.1 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
