Re: [Xen-devel] [PATCH v2 10/13] xen/arm: domain_build: Don't expose IOMMU specific properties to the guest

[Julien Grall <julien.grall@xxxxxxx>]

Hi Oleksandr,

On 25/07/17 18:26, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> We don't passthrough IOMMU device to DOM0 even if it is not used by
> Xen. Therefore exposing the properties that describe relationship
> between master devices and IOMMUs does not make any sense.
>
> According to the:
> 1. Documentation/devicetree/bindings/iommu/iommu.txt
> 2. Documentation/devicetree/bindings/pci/pci-iommu.txt
>
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
>
> ---
>    Changes in v1:
>       -
>
>    Changes in v2:
>       - Skip optional properties too.
>       - Clarify patch description
> ---
>  xen/arch/arm/domain_build.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 3abacc0..fadfbbc 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -432,6 +432,16 @@ static int write_properties(struct domain *d, struct 
> kernel_info *kinfo,
>              continue;
>          }
>
> +        /* Don't expose IOMMU specific properties to the guest */
> +        if ( dt_property_name_is_equal(prop, "iommus") )
> +            continue;
> +
> +        if ( dt_property_name_is_equal(prop, "iommu-map") )
> +            continue;
> +
> +        if ( dt_property_name_is_equal(prop, "iommu-map-mask") )
> +            continue;
> +
Sadly we don't have some sort of array to blacklist property. This could 
be a good improvement if you have time to look at it.
In any case:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

>          res = fdt_property(kinfo->fdt, prop->name, prop_data, prop_len);
>
>          if ( res )
Cheers,

--
Julien Grall

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