how to unbind the device from guest to host with vt-d

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Hi, everyone,
I 'm here  ask how to unbind the device from guest to host with vt-d.
I use the /sys/bus/pci/driver/pci-stub/remove_id
and the /sys/bus/pci/driver/pci-stub/unbind

but I can't find the dir : /sys/bus/pci/device/0000:09:00.0/driver .
So I can't bind the driver back to host system any more.
The device is not available in my host system.

I use the full virtio, by the way when my guest os shutdown, it gave a
kernel panic, said the e1000_shutdown func had a bug.




--
hepeng
ICT
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