vfio: add vfio_pci_config_space_read/write()

Add these helpers that access config space and return an -errno style
return.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
Link: https://lore.kernel.org/qemu-devel/20250507152020.1254632-8-john.levon@nutanix.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
1 file changed