openstack kvm WINDOWS虚拟机VDAGENT导致CPU占用100%问题的解决

虚拟机使用SPICE连接，虚拟机里安装 了vdagent,是从spice官网下载的
使用openstack运行虚拟机后发现虚拟机里CPU占用率100%，查找的话发现是vdagent服务导致的。
查看vdagent日志

应该是vio_serial的问题
用virsh dumpxml去看和正常的区别，会发现有channel设备类型是pty，应该是spicevmc才对
所以就暴力的修改源代码来解决吧，虚拟机没有声音，顺便增加了声音设备
修改如下：

    diff -aruN nova-2015.1.0.org/nova/virt/libvirt/config.py nova-2015.1.0/nova/virt/libvirt/config.py
--- nova-2015.1.0.org/nova/virt/libvirt/config.py   2015-10-29 15:01:39.819057624 +0800
+++ nova-2015.1.0/nova/virt/libvirt/config.py   2015-10-29 15:03:36.093143274 +0800
@@ -1329,7 +1329,14 @@

     return dev

-
+class LibvirtConfigGuestSound(LibvirtConfigGuestDevice): #wz
+    def __init__(self, **kwargs):
+        super(LibvirtConfigGuestSound, self).__init__(root_name="sound",**kwargs)
+        self.type = "ich6" 
+    def format_dom(self):
+        dev = super(LibvirtConfigGuestSound, self).format_dom()
+        dev.set("model", self.type)
+        return dev
 class LibvirtConfigMemoryBalloon(LibvirtConfigGuestDevice):
 def __init__(self, **kwargs):
     super(LibvirtConfigMemoryBalloon, self).__init__(
@@ -1426,13 +1433,14 @@
                     self.slot = sub.get('slot')
                     self.function = sub.get('function')

+#class LibvirtConfigGuestCharBase(LibvirtConfigGuestDevice):

 class LibvirtConfigGuestCharBase(LibvirtConfigGuestDevice):

 def __init__(self, **kwargs):
     super(LibvirtConfigGuestCharBase, self).__init__(**kwargs)

-        self.type = "pty"
+        self.type = "spicevmc"
     self.source_path = None
     self.listen_port = None
     self.listen_host = None
diff -aruN nova-2015.1.0.org/nova/virt/libvirt/driver.py nova-2015.1.0/nova/virt/libvirt/driver.py
--- nova-2015.1.0.org/nova/virt/libvirt/driver.py   2015-10-29 15:01:39.819057624 +0800
+++ nova-2015.1.0/nova/virt/libvirt/driver.py   2015-10-29 15:03:25.752317678 +0800
@@ -3889,6 +3889,9 @@
     if max_vram and video_ram:
         video.vram = video_ram * units.Mi / units.Ki
     guest.add_device(video)
+        sound = vconfig.LibvirtConfigGuestSound()
+        guest.add_device(sound)    
+

 def _add_qga_device(self, guest, instance):
     qga = vconfig.LibvirtConfigGuestChannel()

参考：
http://dbaxps.blogspot.com/2015/10/switching-to-dashboard-spice-console-in.html
http://textuploader.com/aij31