KVM: arm/arm64: vITS: Add a helper to update the affinity of an LPI

In order to help integrating the vITS code with GICv4, let's add
a new helper that deals with updating the affinity of an LPI,
which will later be augmented with super duper extra GICv4
goodness.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 1de4e68..09accdf 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -336,6 +336,15 @@ static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr)
        return i;
 }
 
+static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
+{
+       spin_lock(&irq->irq_lock);
+       irq->target_vcpu = vcpu;
+       spin_unlock(&irq->irq_lock);
+
+       return 0;
+}
+
 /*
  * Promotes the ITS view of affinity of an ITTE (which redistributor this LPI
  * is targeting) to the VGIC's view, which deals with target VCPUs.
@@ -350,10 +359,7 @@ static void update_affinity_ite(struct kvm *kvm, struct its_ite *ite)
                return;
 
        vcpu = kvm_get_vcpu(kvm, ite->collection->target_addr);
-
-       spin_lock(&ite->irq->irq_lock);
-       ite->irq->target_vcpu = vcpu;
-       spin_unlock(&ite->irq->irq_lock);
+       update_affinity(ite->irq, vcpu);
 }
 
 /*
@@ -696,11 +702,7 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
        ite->collection = collection;
        vcpu = kvm_get_vcpu(kvm, collection->target_addr);
 
-       spin_lock(&ite->irq->irq_lock);
-       ite->irq->target_vcpu = vcpu;
-       spin_unlock(&ite->irq->irq_lock);
-
-       return 0;
+       return update_affinity(ite->irq, vcpu);
 }
 
 /*