Commit 12df7429 authored by Zenghui Yu's avatar Zenghui Yu Committed by Marc Zyngier
Browse files

KVM: arm64: GICv4.1: Restore VLPI pending state to physical side 



When setting the forwarding path of a VLPI (switch to the HW mode),
we can also transfer the pending state from irq->pending_latch to
VPT (especially in migration, the pending states of VLPIs are restored
into kvm’s vgic first). And we currently send "INT+VSYNC" to trigger
a VLPI to pending.

Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarShenming Lu <lushenming@huawei.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210322060158.1584-6-lushenming@huawei.com
parent f66b7b15

arch/arm64/kvm/vgic/vgic-v4.c

+19 −0
Original line number Original line Diff line number Diff line
@@ -404,6 +404,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, 
	struct vgic_its *its;

	struct vgic_its *its;

	struct vgic_irq *irq;

	struct vgic_irq *irq;

	struct its_vlpi_map map;

	struct its_vlpi_map map;

	unsigned long flags;

	int ret;

	int ret;





	if (!vgic_supports_direct_msis(kvm))

	if (!vgic_supports_direct_msis(kvm))
@@ -449,6 +450,24 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq, 
	irq->host_irq	= virq;

	irq->host_irq	= virq;

	atomic_inc(&map.vpe->vlpi_count);

	atomic_inc(&map.vpe->vlpi_count);





	/* Transfer pending state */

	raw_spin_lock_irqsave(&irq->irq_lock, flags);

	if (irq->pending_latch) {

		ret = irq_set_irqchip_state(irq->host_irq,

					    IRQCHIP_STATE_PENDING,

					    irq->pending_latch);

		WARN_RATELIMIT(ret, "IRQ %d", irq->host_irq);



		/*

		 * Clear pending_latch and communicate this state

		 * change via vgic_queue_irq_unlock.

		 */

		irq->pending_latch = false;

		vgic_queue_irq_unlock(kvm, irq, flags);

	} else {

		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);

	}



out:

out:

	mutex_unlock(&its->its_lock);

	mutex_unlock(&its->its_lock);

	return ret;

	return ret;