linux-kernel - Re: [PATCH v6 2/6] iommufd: Add IOMMU_HWPT

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Date:   Wed, 6 Dec 2023 14:33:00 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     joro@...tes.org, alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, baolu.lu@...ux.intel.com, cohuck@...hat.com,
        eric.auger@...hat.com, nicolinc@...dia.com, kvm@...r.kernel.org,
        mjrosato@...ux.ibm.com, chao.p.peng@...ux.intel.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com,
        xin.zeng@...el.com, yan.y.zhao@...el.com
Subject: Re: [PATCH v6 2/6] iommufd: Add IOMMU_HWPT_INVALIDATE

On Fri, Nov 17, 2023 at 05:07:13AM -0800, Yi Liu wrote:
> +/**
> + * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
> + * @size: sizeof(struct iommu_hwpt_invalidate)
> + * @hwpt_id: HWPT ID of a nested HWPT for cache invalidation
> + * @reqs_uptr: User pointer to an array having @req_num of cache invalidation
> + *             requests. The request entries in the array are of fixed width
> + *             @req_len, and contain a user data structure for invalidation
> + *             request specific to the given hardware page table.
> + * @req_type: One of enum iommu_hwpt_data_type, defining the data type of all
> + *            the entries in the invalidation request array. It should suit
> + *            with the data_type passed per the allocation of the hwpt pointed
> + *            by @hwpt_id.
> + * @req_len: Length (in bytes) of a request entry in the request array
> + * @req_num: Input the number of cache invalidation requests in the array.
> + *           Output the number of requests successfully handled by kernel.
> + * @out_driver_error_code: Report a driver speicifc error code upon failure.
> + *                         It's optional, driver has a choice to fill it or
> + *                         not.

"specific"

Jason