linux-kernel - RE: [RFC 03/20] vfio: Add vfio_[un]register

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Date:   Thu, 23 Sep 2021 00:38:10 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "hch@....de" <hch@....de>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "lkml@...ux.net" <lkml@...ux.net>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "lushenming@...wei.com" <lushenming@...wei.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "yi.l.liu@...ux.intel.com" <yi.l.liu@...ux.intel.com>,
        "Tian, Jun J" <jun.j.tian@...el.com>, "Wu, Hao" <hao.wu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "david@...son.dropbear.id.au" <david@...son.dropbear.id.au>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>
Subject: RE: [RFC 03/20] vfio: Add vfio_[un]register_device()

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Thursday, September 23, 2021 7:52 AM
> 
> On Wed, Sep 22, 2021 at 11:45:33PM +0000, Tian, Kevin wrote:
> > > From: Alex Williamson <alex.williamson@...hat.com>
> 
> > btw I realized another related piece regarding to the new layout that
> > Jason suggested, which have sys device node include a link to the vfio
> > devnode:
> >
> > 	/sys/bus/pci/devices/DDDD:BB:DD.F/vfio/vfioX/dev
> >
> > This for sure requires specific vfio driver support to get the link
> > established.
> 
> It doesn't. Just set the parent device of the vfio_device's struct
> device to the physical struct device that vfio is already tracking -
> ie the struct device providing the IOMMU. The driver core takes care
> of everything else.
> 

Thanks for correction. So it's still the same try-and-fail model for both 
devices which support iommufd and which do not.