On Fri, Apr 12, 2024 at 08:47:09PM -0700, Nicolin Chen wrote:

> +/**
> + * struct iommu_vqueue_alloc - ioctl(IOMMU_VQUEUE_ALLOC)
> + * @size: sizeof(struct iommu_vqueue_alloc)
> + * @flags: Must be 0
> + * @viommu_id: viommu ID to associate the virtual queue with
> + * @out_vqueue_id: The ID of the new virtual queue
> + * @data_type: One of enum iommu_vqueue_data_type
> + * @data_len: Length of the type specific data
> + * @data_uptr: User pointer to the type specific data
> + *
> + * Allocate an virtual queue object for driver-specific HW-accelerated queue
> + */
> +
> +struct iommu_vqueue_alloc {
> +	__u32 size;
> +	__u32 flags;
> +	__u32 viommu_id;
> +	__u32 out_vqueue_id;
> +	__u32 data_type;
> +	__u32 data_len;
> +	__aligned_u64 data_uptr;

Some of the iommus will want an IPA here not a user pointer. I think
it is fine API wise, we'd just add a flag to indicate data_uptr is an
IPA.

Jason