tree a7d3a2634f54a2e96c20334a9c4dd2b237736bec
parent 1291a0d5049dbc06baaaf66a9ff3f53db493b19b
author Alexey Kardashevskiy <aik@ozlabs.ru> 1512611814 +1100
committer Alex Williamson <alex.williamson@redhat.com> 1513788832 -0700

vfio-pci: Mask INTx if a device is not capabable of enabling it

At the moment VFIO rightfully assumes that INTx is supported if
the interrupt pin is not set to zero in the device config space.
However if that is not the case (the pin is not zero but pdev->irq is),
vfio_intx_enable() fails.

In order to prevent the userspace from trying to enable INTx when we know
that it cannot work, let's mask the PCI_INTERRUPT_PIN register.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>