KVM Virtualizor环境下Windows虚拟机QEMU Guest Agent无法识别及相关问题求助

各位大佬好，我现在碰到个棘手的问题，想请大家帮忙排查下：

我用的是KVM+Virtualizor环境，有一台Windows虚拟机，已经成功安装了对应驱动和QEMU Guest Agent，而且在Virtualizor面板里也开启了Guest Agent选项，但虚拟机始终识别不到这个代理服务。

下面是我在Windows虚拟机内直接运行qemu-ga.exe得到的输出日志：

普通Windows版本的日志输出 #

QEMU Guest Agent VSS Provider[1488]: DllMain begin, reason = 1
QEMU Guest Agent VSS Provider[1488]: DllMain end
QEMU Guest Agent VSS Provider[1488]: requester_init begin
QEMU Guest Agent VSS Provider[1488]: requester_init end
1698769110.306853: critical: error opening path \\.\Global\org.qemu.guest_agent.0: The system cannot find the file specified.
1698769110.323276: critical: error opening channel
1698769110.323276: critical: failed to create guest agent channel
1698769110.355665: critical: failed to initialize guest agent channel
QEMU Guest Agent VSS Provider[1488]: DllMain begin, reason = 0
QEMU Guest Agent VSS Provider[1488]: DllMain end

Windows Server 2022（带最新系统更新）的日志输出 #

QEMU Guest Agent VSS Provider[6652]: DllMain begin, reason = 1
QEMU Guest Agent VSS Provider[6652]: DllMain end
QEMU Guest Agent VSS Provider[6652]: requester_init begin
QEMU Guest Agent VSS Provider[6652]: requester_init end
1698758426.411241: critical: error opening path \\.\Global\org.qemu.guest_agent.0: Access is denied.
1698758426.444493: critical: error opening channel
1698758426.444493: critical: failed to create guest agent channel
1698758426.461036: critical: failed to initialize guest agent channel
QEMU Guest Agent VSS Provider[6652]: DllMain begin, reason = 0
QEMU Guest Agent VSS Provider[6652]: DllMain end

另外我还安装了Spice Guest Tools，但里面的WebDAV服务也无法成功启动，启动时会崩溃，错误代码1067，日志如下：

** (spice-webdavd.exe:2188): ERROR **: 10:45:16.262: The service process could not connect to the service controller.

更奇怪的是，libvirt日志里完全找不到任何和Guest Agent相关的记录...

有没有大佬遇到过类似的情况？或者能给我一些排查方向的建议？万分感谢🙏

备注：内容来源于stack exchange，提问作者muerfox