[Virtio-fs] [PATCH v2 04/20] virtio: Implement get_shm_region for PCI transport

[Gurchetan Singh]

On Mon, Aug 10, 2020 at 7:50 AM Vivek Goyal <vgoyal at redhat.com> wrote:

> On Mon, Aug 10, 2020 at 10:05:17AM -0400, Michael S. Tsirkin wrote:
> > On Fri, Aug 07, 2020 at 03:55:10PM -0400, Vivek Goyal wrote:
> > > From: Sebastien Boeuf <sebastien.boeuf at intel.com>
> > >
> > > On PCI the shm regions are found using capability entries;
> > > find a region by searching for the capability.
> > >
> > > Signed-off-by: Sebastien Boeuf <sebastien.boeuf at intel.com>
> > > Signed-off-by: Dr. David Alan Gilbert <dgilbert at redhat.com>
> > > Signed-off-by: kbuild test robot <lkp at intel.com>
> > > Cc: kvm at vger.kernel.org
> > > Cc: "Michael S. Tsirkin" <mst at redhat.com>
> >
> > Acked-by: Michael S. Tsirkin <mst at redhat.com>
> >
>
> [..]
> > > +static bool vp_get_shm_region(struct virtio_device *vdev,
> > > +                         struct virtio_shm_region *region, u8 id)
> > > +{
> > > +   struct virtio_pci_device *vp_dev = to_vp_device(vdev);
> > > +   struct pci_dev *pci_dev = vp_dev->pci_dev;
> > > +   u8 bar;
> > > +   u64 offset, len;
> > > +   phys_addr_t phys_addr;
> > > +   size_t bar_len;
> > > +
> > > +   if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len)) {
> > > +           return false;
> > > +   }
> > > +
> > > +   phys_addr = pci_resource_start(pci_dev, bar);
> > > +   bar_len = pci_resource_len(pci_dev, bar);
> > > +
> > > +   if ((offset + len) < offset) {
> > > +           dev_err(&pci_dev->dev, "%s: cap offset+len overflow
> detected\n",
> > > +                   __func__);
> > > +           return false;
> > > +   }
> > > +
> > > +   if (offset + len > bar_len) {
> > > +           dev_err(&pci_dev->dev, "%s: bar shorter than cap
> offset+len\n",
> > > +                   __func__);
> > > +           return false;
> > > +   }
> >
> > Maybe move this to a common header so the checks can be reused by
> > other transports? Can be a patch on top.
>
> Will do as patch on top once these patches get merged.
>

There's also some minor checkpatch complaints.  I fixed them with the
series I sent out with virtio-gpu.


>
> Thanks
> Vivek
>
>
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