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Re: [PATCH v3 13/23] xen/arm: vsmmuv3: Add "iommus" property node for dom0 devices
- To: Milan Djokic <milan_djokic@xxxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Mon, 13 Apr 2026 11:16:45 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Rahul Singh <Rahul.Singh@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 13 Apr 2026 11:18:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v3 13/23] xen/arm: vsmmuv3: Add "iommus" property node for dom0 devices
Hi Milan,
> On 31 Mar 2026, at 02:52, Milan Djokic <milan_djokic@xxxxxxxx> wrote:
>
> From: Rahul Singh <rahul.singh@xxxxxxx>
>
> "iommus" property will be added for dom0 devices to virtual
> IOMMU node to enable the dom0 linux kernel to configure the IOMMU
>
> Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
> Signed-off-by: Milan Djokic <milan_djokic@xxxxxxxx>
> ---
> xen/arch/arm/domain_build.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index a51563ee3d..30a4f1fd09 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -538,9 +538,12 @@ static int __init write_properties(struct domain *d,
> struct kernel_info *kinfo,
> continue;
> }
>
> - if ( iommu_node )
> + /*
> + * Expose IOMMU specific properties to hwdom when vIOMMU is
> + * enabled.
> + */
> + if ( iommu_node && !is_viommu_enabled() )
> {
> - /* Don't expose IOMMU specific properties to hwdom */
> if ( dt_property_name_is_equal(prop, "iommus") )
> continue;
>
>
I think this commit should be squashed with "xen/arm: vIOMMU: IOMMU device tree
node for dom0”
so that we can have a consistent handling of the DT properties.
Cheers,
Luca
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