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SubjectRe: [PATCH] vfio-pci: Disable binding to PFs with SR-IOV enabled
On Thu, Jul 12, 2018 at 04:33:04PM -0600, Alex Williamson wrote:
> 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.
>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Reviewed-by: Peter Xu <peterx@redhat.com>

--
Peter Xu
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