vfkit: Enable timesync

On macOS, after a host suspend, the guest clock will be out of sync.
vfkit has a --timesync feature, which resyncs the guest clock when the
host comes out of sleep.
This commit makes use of it.

pkg/crc/constants/constants_darwin.go

@@ -11,6 +11,7 @@ const (
 	PodmanRemoteExecutableName = "podman"
 	TrayExecutableName         = "Red Hat OpenShift Local.app"
 	DaemonAgentLabel           = "com.redhat.crc.daemon"
+	QemuGuestAgentPort         = 1234
 )
 
 var (

pkg/crc/machine/vfkit/driver_darwin.go

@@ -26,6 +26,8 @@ func CreateHost(machineConfig config.MachineConfig) *vfkit.Driver {
 	vfDriver.VsockPath = constants.TapSocketPath
 	vfDriver.DaemonVsockPort = constants.DaemonVsockPort
 
+	vfDriver.QemuGAVsockPort = constants.QemuGuestAgentPort
+
 	vfDriver.SharedDirs = configureShareDirs(machineConfig)
 
 	return vfDriver

pkg/drivers/vfkit/driver_darwin.go

@@ -50,6 +50,7 @@ type Driver struct {
 
 	VsockPath       string
 	DaemonVsockPort uint
+	QemuGAVsockPort uint
 }
 
 func NewDriver(hostName, storePath string) *Driver {
@@ -255,6 +256,20 @@ func (d *Driver) Start() error {
 		return err
 	}
 
+	// when loading a VM created by a crc version predating this commit,
+	// d.QemuGAVsockPort will be missing from ~/.crc/machines/crc/config.json
+	// In such a case, assume the VM will not support time sync
+	if d.QemuGAVsockPort != 0 {
+		timesync, err := client.TimeSyncNew(d.QemuGAVsockPort)
+		if err != nil {
+			return err
+		}
+		err = vm.AddDevice(timesync)
+		if err != nil {
+			return err
+		}
+	}
+
 	args, err := vm.ToCmdLine()
 	if err != nil {
 		return err