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Re: [PATCH v3 14/23] xen/arm: vIOMMU: IOMMU device tree node for dom0
- To: Milan Djokic <milan_djokic@xxxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Mon, 13 Apr 2026 11:46:56 +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 11:48:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v3 14/23] xen/arm: vIOMMU: IOMMU device tree node for dom0
Hi Milan,
> On 31 Mar 2026, at 02:52, Milan Djokic <milan_djokic@xxxxxxxx> wrote:
>
> From: Rahul Singh <rahul.singh@xxxxxxx>
>
> XEN will create an IOMMU device tree node in the device tree
> to enable the dom0 to discover the virtual SMMUv3 during dom0 boot.
> IOMMU device tree node will only be created when cmdline option viommu
> is enabled.
>
> Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
> Signed-off-by: Milan Djokic <milan_djokic@xxxxxxxx>
> ---
> xen/arch/arm/domain_build.c | 94 +++++++++++++++++++++++++++++++
> xen/arch/arm/include/asm/viommu.h | 1 +
> 2 files changed, 95 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 30a4f1fd09..54ae3b5033 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1440,6 +1440,95 @@ int __init make_timer_node(const struct kernel_info
> *kinfo)
> return res;
> }
>
> +#ifdef CONFIG_ARM_VIRTUAL_IOMMU
> +static int make_hwdom_viommu_node(const struct kernel_info *kinfo)
__init ?
The rest looks ok to me, with that fixed:
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Cheers,
Luca
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