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

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Message-ID: <BN9PR11MB5276C39E256CD4B922435E1C8C609@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 21 Apr 2023 07:47:13 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>
CC:     "jgg@...dia.com" <jgg@...dia.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "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: Friday, April 21, 2023 3:42 PM
> 
> On Fri, Apr 21, 2023 at 07:35:52AM +0000, Tian, Kevin wrote:
> > External email: Use caution opening links or attachments
> >
> >
> > > 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.
> 
> Weird! How could it be missed during copy-n-paste..
> I recalled that I had it but seemingly lost it after an update.
> 
> It is in the commit message of the cover-letter though:
> https://github.com/nicolinc/iommufd/commit/5e17d270bfca2a5e3e7401d4b
> f58ae53eb7a8a55
> --------------------------------------------------------
> Changelog
> v2:
>  * Integrated the uAPI into VFIO_DEVICE_BIND_IOMMUFD call
>  * Renamed the previous set_rid_user to set_dev_data, to decouple from
>    the PCI regime.
> v1:
>  https://lore.kernel.org/all/cover.1680762112.git.nicolinc@nvidia.com/
> --------------------------------------------------------
> 
> > 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...
> 
> Yea. Jason told me to decouple it from PCI. And merge it into
> a general uAPI. So I picked the BIND ioctl.
> 

'decouple it from PCI' is kind of covered by renaming set_rid
to set_data. but I didn't get why this has to be merged with another
uAPI. Once iommufd_device is created we could have separate
ioctls to poke its attributes individually. What'd be broken if this
is not done at BIND time?