Messages in this thread | | | Date | Mon, 10 Aug 2020 10:50:19 -0400 | From | Vivek Goyal <> | Subject | Re: [PATCH v2 04/20] virtio: Implement get_shm_region for PCI transport |
| |
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@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@intel.com> > > Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > > Signed-off-by: kbuild test robot <lkp@intel.com> > > Cc: kvm@vger.kernel.org > > Cc: "Michael S. Tsirkin" <mst@redhat.com> > > Acked-by: Michael S. Tsirkin <mst@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.
Thanks Vivek
| |