linux-kernel - RE: [PATCH RFC v2 0/3] Add set_dev_data and unset_dev

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Message-ID: <BN9PR11MB52764ED59905104D3A5A68C08C609@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 21 Apr 2023 07:35:52 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>
CC:     "robin.murphy@....com" <robin.murphy@....com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "will@...nel.org" <will@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC v2 0/3] Add set_dev_data and unset_dev_data support

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Thursday, April 20, 2023 3:48 PM
> 
> This is a pair of new uAPI/ops for user space to set an iommu specific
> device data for a passthrough device. This is primarily used by SMMUv3
> driver for now, to link the vSID and the pSID of a device that's behind
> the SMMU. The link (lookup table) will be used to verify any ATC_INV
> command from the user space for that device, and then replace the SID
> field (virtual SID) with the corresponding physical SID.
> 
> This series is available on Github:
> https://github.com/nicolinc/iommufd/commits/set_dev_data-rfc-v2
> 
> Thanks!
> Nicolin
> 

there is no changelog compared to v1.

Could you add some words why changing from passing the information
in an iommufd ioctl to bind_iommufd? My gut-feeling leans toward
the latter option...