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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Lu Baolu <baolu.lu@linux.intel.com>, Jason Gunthorpe <jgg@ziepe.ca>, Joerg
 Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, Robin Murphy
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 Pan" <jacob.jun.pan@linux.intel.com>, Joel Granados <j.granados@samsung.com>
CC: "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
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Subject: RE: [PATCH v6 05/10] iommufd: Add fault and response message
 definitions
Thread-Topic: [PATCH v6 05/10] iommufd: Add fault and response message
 definitions
Thread-Index: AQHar+txjixJkLb+zkCCruAoIX1UvbG45C5w
Date: Wed, 5 Jun 2024 08:28:52 +0000
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> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Monday, May 27, 2024 12:05 PM
>=20
> +
> +/**
> + * struct iommu_hwpt_page_response - IOMMU page fault response
> + * @size: sizeof(struct iommu_hwpt_page_response)
> + * @flags: Must be set to 0
> + * @dev_id: device ID of target device for the response
> + * @pasid: Process Address Space ID
> + * @grpid: Page Request Group Index
> + * @code: One of response code in enum iommufd_page_response_code.
> + * @cookie: The kernel-managed cookie reported in the fault message.
> + */
> +struct iommu_hwpt_page_response {
> +	__u32 size;
> +	__u32 flags;
> +	__u32 dev_id;
> +	__u32 pasid;
> +	__u32 grpid;
> +	__u32 code;
> +	__u32 cookie;
> +	__u32 reserved;
> +};

with the response queue per fault object we don't need all fields here,
e.g. dev_id, pasid, etc. Cookie is sufficient.