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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-16 10:34:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-16 10:34:05 -0700
commitb6d6a3076ac4eecb2d9cbcf17730fc160b94cadc (patch)
tree812bc521bf1aaaed0cfb140e6743ac9208407696 /drivers/vfio/pci
parentd01e12dd3f4227f1be5d7c5bffa7b8240787bec1 (diff)
parent0dd0e297f0ec780b6b3484ba38b27d18c8ca7af9 (diff)
downloadlinux-b6d6a3076ac4eecb2d9cbcf17730fc160b94cadc.tar.bz2
Merge tag 'vfio-v4.19-rc1' of git://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson: - mark switch fall-through cases (Gustavo A. R. Silva) - disable binding SR-IOV enabled PFs (Alex Williamson) * tag 'vfio-v4.19-rc1' of git://github.com/awilliam/linux-vfio: vfio-pci: Disable binding to PFs with SR-IOV enabled vfio: Mark expected switch fall-throughs
Diffstat (limited to 'drivers/vfio/pci')
-rw-r--r--drivers/vfio/pci/vfio_pci.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 3b1083fdb898..cddb453a1ba5 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -789,7 +789,7 @@ static long vfio_pci_ioctl(void *device_data,
case VFIO_PCI_ERR_IRQ_INDEX:
if (pci_is_pcie(vdev->pdev))
break;
- /* pass thru to return error */
+ /* fall through */
default:
return -EINVAL;
}
@@ -1192,6 +1192,19 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
return -EINVAL;
+ /*
+ * Prevent binding to PFs with VFs enabled, this too easily allows
+ * userspace instance with VFs and PFs from the same device, which
+ * cannot work. Disabling SR-IOV here would initiate removing the
+ * VFs, which would unbind the driver, which is prone to blocking
+ * if that VF is also in use by vfio-pci. Just reject these PFs
+ * and let the user sort it out.
+ */
+ if (pci_num_vf(pdev)) {
+ pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
+ return -EBUSY;
+ }
+
group = vfio_iommu_group_get(&pdev->dev);
if (!group)
return -EINVAL;