[PATCH v5 13/26] KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS

Marc Zyngier
2017-10-27T14:28:21Z

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>
---
virt/kvm/arm/vgic/vgic-its.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index c9b1c0967426..42ffb9084bb7 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -337,11 +337,25 @@ 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;
}

/*
--
2.11.0