vfio: refactor out IRQ signalling setup

This makes for a slightly more readable vfio_msix_vector_do_use()
implementation, and we will rely on this shortly.

Signed-off-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250520150419.2172078-5-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
1 file changed