Merge pull request #687 from teawater/addlog

QemuDriver.InitDriver, KvmtoolDriver.InitDriver, XenPvDriver.InitDriv…

Author: laijs

hypervisor/kvmtool/lkvm.go

@@ -42,6 +42,7 @@ type KvmtoolContext struct {
 func InitDriver() *KvmtoolDriver {
 	cmd, err := exec.LookPath(KVMTOOL_EXEC)
 	if err != nil {
+		glog.Errorf("LookPath %s failed: %v", KVMTOOL_EXEC, err)
 		return nil
 	}
 

hypervisor/qemu/qemu.go

@@ -44,13 +44,17 @@ func qemuContext(ctx *hypervisor.VmContext) *QemuContext {
 func InitDriver() *QemuDriver {
 	cmd, err := exec.LookPath(QEMU_SYSTEM_EXE)
 	if err != nil {
+		glog.Errorf("LookPath %s failed: %v", QEMU_SYSTEM_EXE, err)
 		return nil
 	}
 
 	var hasVsock bool
 	_, err = exec.Command("/sbin/modprobe", "vhost_vsock").Output()
 	if err == nil {
+		glog.V(3).Infof("Current system supports vsock")
 		hasVsock = true
+	} else {
+		glog.V(3).Infof("Current system doesn't support vsock because modprobe vhost_vsock failed")
 	}
 
 	return &QemuDriver{

hypervisor/xenpv/xenpv.go

@@ -35,6 +35,7 @@ type XenPvContext struct {
 func InitDriver() *XenPvDriver {
 	cmd, err := exec.LookPath(XENLIGHT_EXEC)
 	if err != nil {
+		glog.Errorf("LookPath %s failed: %v", XENLIGHT_EXEC, err)
 		return nil
 	}