Function devices::pci::coiommu::pin_page

fn pin_page(
    pinstate: &mut CoIommuPinState,
    policy: CoIommuUnpinPolicy,
    vfio_container: &Arc<Mutex<VfioContainer>>,
    mem: &GuestMemory,
    dtt_level: u64,
    dtt_root: u64,
    dtt_iter: &mut DTTIter,
    gfn: u64
) -> Result<()>