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[Qemu-devel] [Question] vhost-user: hot-unplug vhost-user nic for window
From: |
linzhecheng |
Subject: |
[Qemu-devel] [Question] vhost-user: hot-unplug vhost-user nic for windows guest OS will fail with 100% reproduce rate |
Date: |
Fri, 8 Dec 2017 02:10:26 +0000 |
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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