[RFC PATCH v4 03/16] iommu/arm-smmu-v3: Add initial pSMMU realm viommu plumbing

[Jason Gunthorpe]

On Tue, Sep 01, 2026 at 03:36:37PM +0530, Aneesh Kumar K.V wrote:

> @@ -463,14 +460,13 @@
>  	vsmmu->vmid = s2_parent->s2_cfg.vmid;
>  
>  	if (viommu->type == IOMMU_VIOMMU_TYPE_ARM_SMMUV3) {
> +		if (arm_smmu_is_realm_viommu(viommu))
> +			return arm_realm_smmu_v3_init(viommu, user_data);
> +

I think the realm vsmmu is going to require a different info struct
than the normal psmmu case, isn't it?

If so it needs its own enum value.

It would be nice to see a draft patch showing how the real vsmmu works
on top of the RMM spec for it. If we are using a viommu object then
non-vsmmu case should be identical just with an option in the info
struct to not create the vsmmu object.

Jason