netdev - Re: [PATCH 2/5] vfio: Require that devices support DMA cache coherence

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Message-ID: <20220407145332.GA3397825@nvidia.com>
Date:   Thu, 7 Apr 2022 11:53:32 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Christian Benvenuti <benve@...co.com>,
        Cornelia Huck <cohuck@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Jason Wang <jasowang@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Nelson Escobar <neescoba@...co.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Will Deacon <will@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 2/5] vfio: Require that devices support DMA cache
 coherence

On Wed, Apr 06, 2022 at 07:02:36AM +0000, Tian, Kevin wrote:

> > So like this:
> > 
> >  int vfio_register_group_dev(struct vfio_device *device)
> >  {
> > +       if (!dev_is_dma_coherent(device->dev))
> > +               return -EINVAL;
> > +
> >         return __vfio_register_dev(device,
> >                 vfio_group_find_or_alloc(device->dev));
> >  }
> > 
> > I fixed it up.
> > 
> 
> if that is the case should it also apply to usnic and vdpa in the first
> patch (i.e. fail the probe)?

Ideally, but I don't want to mess with existing logic in these
drivers..

Thanks,
Jason