Re: [PATCH v3 17/22] iommu/amd: Introduce helper function for updating domain ID mapping table

[Jason Gunthorpe]

On Mon, Jun 29, 2026 at 03:35:30PM +0000, Suravee Suthikulpanit wrote:
> +int amd_viommu_domain_id_update(struct amd_iommu *iommu, u16 gid,
> +				u16 hdom_id, u16 gdom_id)
> +{
> +	u64 val;
> +	u8 __iomem *vfctrl = VIOMMU_VFCTRL_MMIO_BASE(iommu, gid);
> +
> +	val = FIELD_PREP(DOMID_ENTRY_GDOMID_MASK, gdom_id) |
> +	      FIELD_PREP(DOMID_ENTRY_HDOMID_MASK, hdom_id) |
> +	      DOMID_ENTRY_WRITE | DOMID_ENTRY_VALID;
> +
> +	writeq(val, vfctrl + VIOMMU_VFCTRL_GUEST_DID_MAP_CONTROL1_OFFSET);
> +	return 0;
> +}
> +EXPORT_SYMBOL(amd_viommu_domain_id_update);

Why is this exported?

Jason