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disk missing in the guest contingently when hotplug several virtio scsi disks consecutively
Hi, I found a bug that disk missing (not all disks missing ) in the guest contingently when hotplug several virtio scsi disks consecutively. After rebooting the guest,the missing disks appear again.
The guest is centos7.3 running on a centos7.3 host and the scsi controllers are configed with iothread. The scsi controller xml is below:
<controller type='scsi' index='0' model='virtio-scsi'>
<driver iothread='26'/>
<alias name='scsi0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</controller>
If the scsi controllers are configed without iothread, disks are all can be seen in the guest when hotplug several virtio scsi disks consecutively.
I think the biggest difference between them is that scsi controllers with iothread call virtio_notify_irqfd to notify guest and scsi controllers without
iothread call virtio_notify instead. What make it difference? Will interrupts are lost when call virtio_notify_irqfd due to race condition for some unknow reasons? Maybe guys more familiar with scsi dataplane can help. Thanks for your reply!
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