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+KVM: 0.172
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+network: 0.044
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+PID: 0.016
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+boot: 0.001
+graphic: 0.001
+
+[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.
+