[PATCH v3 05/12] KVM: arm/arm64: vgic-v2: Reset LRs at boot time

[Christoffer Dall]

On Mon, Mar 07, 2016 at 09:33:27AM +0000, Marc Zyngier wrote:
> In order to let make the GICv2 code more lazy in the way it
> accesses the LRs, it is necessary to start with a clean slate.
> 
> Let's reset the LRs on each CPU when the vgic is probed.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>

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

> ---
>  virt/kvm/arm/vgic-v2.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/virt/kvm/arm/vgic-v2.c b/virt/kvm/arm/vgic-v2.c
> index ff02f08..67ec334 100644
> --- a/virt/kvm/arm/vgic-v2.c
> +++ b/virt/kvm/arm/vgic-v2.c
> @@ -176,6 +176,15 @@ static const struct vgic_ops vgic_v2_ops = {
>  
>  static struct vgic_params vgic_v2_params;
>  
> +static void vgic_cpu_init_lrs(void *params)
> +{
> +	struct vgic_params *vgic = params;
> +	int i;
> +
> +	for (i = 0; i < vgic->nr_lr; i++)
> +		writel_relaxed(0, vgic->vctrl_base + GICH_LR0 + (i * 4));
> +}
> +
>  /**
>   * vgic_v2_probe - probe for a GICv2 compatible interrupt controller in DT
>   * @node:	pointer to the DT node
> @@ -257,6 +266,9 @@ int vgic_v2_probe(struct device_node *vgic_node,
>  
>  	vgic->type = VGIC_V2;
>  	vgic->max_gic_vcpus = VGIC_V2_MAX_CPUS;
> +
> +	on_each_cpu(vgic_cpu_init_lrs, vgic, 1);
> +
>  	*ops = &vgic_v2_ops;
>  	*params = vgic;
>  	goto out;
> -- 
> 2.1.4
>