virtio_pci: fix level interrupts with irqfd
commit
62c96360ae7f2c7a8b029277fbb7cb082fdef7fd
virtio-pci: fix level interrupts
only helps systems without irqfd: on systems with irqfd support we
passed in flag requesting irqfd even when msix is disabled.
As a result, for level interrupts we didn't install an fd handler so
unmasking an fd had no effect.
Fix this up.
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit
23fe2b3f9e7df8da53ac1bc32c6875254911d7f4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>