I was expecting some replies / reviews of this patch today.
10/07/2019 23:48, David Marchand:
> The incriminated commit broke the use of RTE_PCI_DRV_IOVA_AS_VA which
> was intended to mean "driver only supports VA" but had been understood
> as "driver supports both PA and VA" by most net drivers and used to let
> dpdk processes to run as non root (which do not have access to physical
> addresses on recent kernels).
>
> The check on physical addresses actually closed the gap for those
> drivers. We don't need to mark them with RTE_PCI_DRV_IOVA_AS_VA and this
> flag can retain its intended meaning.
> Document explicitly its meaning.
>
> We can check that a driver requirement wrt to IOVA mode is fulfilled
> before trying to probe a device.
>
> Finally, document the heuristic used to select the IOVA mode and hope
> that we won't break it again.
>
> Fixes: 703458e19c16 ("bus/pci: consider only usable devices for IOVA mode")
>
> Signed-off-by: David Marchand <david.march...@redhat.com>
