KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS

When the guest issues an affinity change, we need to tell the physical
ITS that we're now targetting a new vcpu.  This is done by extracting
the current mapping, updating the target, and reapplying the mapping.

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

1 files changed, 15 insertions, 1 deletions

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index ad14af8a4412..80bea7021e2e 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -338,11 +338,25 @@ static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr)
 
 static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
 {
+        int ret = 0;
+
         spin_lock(&irq->irq_lock);
         irq->target_vcpu = vcpu;
         spin_unlock(&irq->irq_lock);
 
-        return 0;
+        if (irq->hw) {
+                struct its_vlpi_map map;
+
+                ret = its_get_vlpi(irq->host_irq, &map);
+                if (ret)
+                        return ret;
+
+                map.vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+
+                ret = its_map_vlpi(irq->host_irq, &map);
+        }
+
+        return ret;
 }
 
 /*