linux-kernel - Re: [PATCH RFCv1 12/14] iommufd: Add IOMMUFD_OBJ_VQUEUE and IOMMUFD_CMD_VQUEUE

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Date: Sun, 12 May 2024 12:02:21 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: will@...nel.org, robin.murphy@....com, kevin.tian@...el.com,
	suravee.suthikulpanit@....com, joro@...tes.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	yi.l.liu@...el.com, eric.auger@...hat.com, vasant.hegde@....com,
	jon.grimm@....com, santosh.shukla@....com, Dhaval.Giani@....com,
	shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH RFCv1 12/14] iommufd: Add IOMMUFD_OBJ_VQUEUE and
 IOMMUFD_CMD_VQUEUE_ALLOC

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