[PATCH 5/8] KVM: arm/arm64: Slightly rework kvm_vgic_addr

[Auger Eric]

Hi Christoffer,

On 08/05/2017 13:54, Christoffer Dall wrote:
> As we are about to handle setting the address for the redistributor base
> region separately from some of the other base addresses, let's rework
> this function to leave a little more room for being flexible in what
> each type of base address does.
> 
> Signed-off-by: Christoffer Dall <cdall at linaro.org>
Reviewed-by: Eric Auger <eric.auger at redhat.com>

Thanks

Eric

> ---
>  virt/kvm/arm/vgic/vgic-kvm-device.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
> index d48743c..69ccfd5 100644
> --- a/virt/kvm/arm/vgic/vgic-kvm-device.c
> +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
> @@ -37,6 +37,14 @@ int vgic_check_ioaddr(struct kvm *kvm, phys_addr_t *ioaddr,
>  	return 0;
>  }
>  
> +static int vgic_check_type(struct kvm *kvm, int type_needed)
> +{
> +	if (kvm->arch.vgic.vgic_model != type_needed)
> +		return -ENODEV;
> +	else
> +		return 0;
> +}
> +
>  /**
>   * kvm_vgic_addr - set or get vgic VM base addresses
>   * @kvm:   pointer to the vm struct
> @@ -57,40 +65,36 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
>  {
>  	int r = 0;
>  	struct vgic_dist *vgic = &kvm->arch.vgic;
> -	int type_needed;
>  	phys_addr_t *addr_ptr, alignment;
>  
>  	mutex_lock(&kvm->lock);
>  	switch (type) {
>  	case KVM_VGIC_V2_ADDR_TYPE_DIST:
> -		type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
> +		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
>  		addr_ptr = &vgic->vgic_dist_base;
>  		alignment = SZ_4K;
>  		break;
>  	case KVM_VGIC_V2_ADDR_TYPE_CPU:
> -		type_needed = KVM_DEV_TYPE_ARM_VGIC_V2;
> +		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
>  		addr_ptr = &vgic->vgic_cpu_base;
>  		alignment = SZ_4K;
>  		break;
>  	case KVM_VGIC_V3_ADDR_TYPE_DIST:
> -		type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
> +		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
>  		addr_ptr = &vgic->vgic_dist_base;
>  		alignment = SZ_64K;
>  		break;
>  	case KVM_VGIC_V3_ADDR_TYPE_REDIST:
> -		type_needed = KVM_DEV_TYPE_ARM_VGIC_V3;
> +		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
>  		addr_ptr = &vgic->vgic_redist_base;
>  		alignment = SZ_64K;
>  		break;
>  	default:
>  		r = -ENODEV;
> -		goto out;
>  	}
>  
> -	if (vgic->vgic_model != type_needed) {
> -		r = -ENODEV;
> +	if (r)
>  		goto out;
> -	}
>  
>  	if (write) {
>  		r = vgic_check_ioaddr(kvm, addr_ptr, *addr, alignment);
>