Re: [PATCH v2 3/3] iommufd/vdevice: add TSM guest request ioctl

[Jason Gunthorpe]

On Mon, Mar 09, 2026 at 04:47:04PM +0530, Aneesh Kumar K.V (Arm) wrote:
> +/**
> + * struct iommu_vdevice_tsm_guest_request - ioctl(IOMMU_VDEVICE_TSM_GUEST_REQUEST)
> + * @size: sizeof(struct iommu_vdevice_tsm_guest_request)
> + * @vdevice_id: vDevice ID the guest request is for
> + * @scope: scope of tsm guest request
> + * @req_len: the blob size for @req_uptr, filled by guest
> + * @resp_len: the blob size for @resp_uptr, filled by guest
> + * @req_uptr: request data buffer filled by guest
> + * @resp_uptr: response data buffer
> + */

This needs a much better kdoc.

Refer to specs that define this.

Explain WTF scope is

> +struct iommu_vdevice_tsm_guest_request {
> +	__u32 size;
> +	__u32 vdevice_id;
> +	__u32 scope;
> +	__u32 req_len;
> +	__u32 resp_len;

do not leave implicit padding, add a reserved, and check it is 0

Jason