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virtual: 0.989
hypervisor: 0.884
debug: 0.787
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mistranslation: 0.000
[Qemu-devel] [BUG] vhost-user: hot-unplug vhost-user nic for windows guest OS will fail with 100% reproduce rate
Hi, guys
I met a problem when hot-unplug vhost-user nic for Windows 2008 rc2 sp1 64
(Guest OS)
The xml of nic is as followed:
<interface type='vhostuser'>
<mac address='52:54:00:3b:83:aa'/>
<source type='unix' path='/var/run/vhost-user/port1' mode='client'/>
<target dev='port1'/>
<model type='virtio'/>
<driver queues='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</interface>
Firstly, I use virsh attach-device win2008 vif.xml to hot-plug a nic for Guest
OS. This operation returns success.
After guest OS discover nic successfully, I use virsh detach-device win2008
vif.xml to hot-unplug it. This operation will fail with 100% reproduce rate.
However, if I hot-plug and hot-unplug virtio-net nic , it will not fail.
I have analysis the process of qmp_device_del , I found that qemu have inject
interrupt to acpi to let it notice guest OS to remove nic.
I guess there is something wrong in Windows when handle the interrupt.
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