[PATCH v4 12/26] KVM: arm/arm64: GICv4: Propagate affinity changes to the physical ITS

[Christoffer Dall]

On Fri, Oct 06, 2017 at 04:33:47PM +0100, Marc Zyngier wrote:
> 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.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>

Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>

> ---
>  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;
>  }
>  
>  /*
> -- 
> 2.14.1
>