how to use smmuv3 for arm64?

[ckim]

Hello, all

I found by adding "iommu=smmuv3" in the 'virt' machine option the smmuv3 is
instantiated. Cool.

It looks like smmu is instantiated with PCIe bus. (maybe PCIe ATS is done by
smmuv3..).

But if I want to use smmuv3 for a device attached in the platform, how
should I use it?

I see in hw/arm/smmuv3.c, (version 5.1.0)

static void smmuv3_register_types(void)

{

    type_register(&smmuv3_type_info);

    type_register(&smmuv3_iommu_memory_region_info);

}

I couldn't find any example code using "smmuv3_iommu_memory_region_info".

Is it possible to set a memory region to use smmuv3? 

Thanks for any help.

Chan Kim