[libvirt] [RFC] support vhost-user-scsi configuration

[wangjian (AN)]

Hi Guys,

Currently qemu and spdk already support vhost-user-scsi, but there is no vhost-user-scsi configuration in libvirt.
We hope that libvirt supports the following configurations to facilitate docking with qemu.

<controller type='scsi' index='0' model='vhost-user-scsi'>
   <driver queues='4'/>
   <source type='unix' path='/var/tmp/scsi'>
     <reconnect enabled='yes' timeout='3'/>
   </source>
   <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</controller>

The usage in qemu like this:
-chardev socket,id=chr-vu-virtio-disk10,path=/var/tmp/scsi,reconnect=3
-device vhost-user-blk-pci,num-queues=4,bus=pci.2,addr=0x0,chardev=chr-vu-virtio-disk10,id=scsi0

Could anyone give some suggestions?
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