Method update

pci/src/vfio.rs:122–138

(&mut self, offset: u64, data: &[u8])

impl VfioMsi {
    fn update(&mut self, offset: u64, data: &[u8]) -> Option<InterruptUpdateAction> {
        let old_enabled = self.cfg.enabled();

        self.cfg.update(offset, data);

        let new_enabled = self.cfg.enabled();

        if !old_enabled && new_enabled {
            return Some(InterruptUpdateAction::EnableMsi);
        }

        if old_enabled && !new_enabled {
            return Some(InterruptUpdateAction::DisableMsi);
        }

        None
    }
}

#[derive(Serialize, Deserialize)]