Method pause

vmm/src/vm.rs:3239–3273

(&mut self)

impl Pausable for Vm {
    fn pause(&mut self) -> std::result::Result<(), MigratableError> {
        event!("vm", "pausing");
        let new_state = VmState::Paused;
        self.state
            .valid_transition(new_state)
            .map_err(|e| MigratableError::Pause(anyhow!("Invalid transition: {e:?}")))?;

        #[cfg(target_arch = "x86_64")]
        {
            let mut clock = self
                .vm
                .get_clock()
                .map_err(|e| MigratableError::Pause(anyhow!("Could not get VM clock: {e}")))?;
            clock.reset_flags();
            self.saved_clock = Some(clock);
        }

        // Before pausing the vCPUs activate any pending virtio devices that might
        // need activation between starting the pause (or e.g. a migration it's part of)
        self.activate_virtio_devices().map_err(|e| {
            MigratableError::Pause(anyhow!("Error activating pending virtio devices: {e:?}"))
        })?;

        self.cpu_manager.lock().unwrap().pause()?;
        self.device_manager.lock().unwrap().pause()?;

        self.vm
            .pause()
            .map_err(|e| MigratableError::Pause(anyhow!("Could not pause the VM: {e}")))?;

        self.state = new_state;

        event!("vm", "paused");
        Ok(())
    }

    fn resume(&mut self) -> std::result::Result<(), MigratableError> {
        event!("vm", "resuming");