vfio-pci: Disable binding to PFs with SR-IOV enabled
We expect to receive PFs with SR-IOV disabled, however some host drivers leave SR-IOV enabled at unbind. This puts us in a state where we can potentially assign both the PF and the VF, leading to both functionality as well as security concerns due to lack of managing the SR-IOV state as well as vendor dependent isolation from the PF to VF. If we were to attempt to actively disable SR-IOV on driver probe, we risk VF bound drivers blocking, potentially risking live lock scenarios. Therefore simply refuse to bind to PFs with SR-IOV enabled with a warning message indicating the issue. Users can resolve this by re-binding to the host driver and disabling SR-IOV before attempting to use the device with vfio-pci. Reviewed-by:David Gibson <david@gibson.dropbear.id.au> Reviewed-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
Alex Williamson <alex.williamson@redhat.com>
parent
544c05a6
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