Add support for vhost-user-scsi-pci/vhost-user-blk-pci

[Li Feng <fengli@xxxxxxxxxx>]

Hi Guys,

And I want to add the vhost-user-scsi-pci/vhost-user-blk-pci support
for libvirt.

The usage in qemu like this:

Vhost-SCSI
-chardev socket,id=char0,path=/var/tmp/vhost.0
-device vhost-user-scsi-pci,id=scsi0,chardev=char0
Vhost-BLK
-chardev socket,id=char1,path=/var/tmp/vhost.1
-device vhost-user-blk-pci,id=blk0,chardev=char1

What type should I add for libvirt.
Type1:
    <hostdev mode='subsystem' type='vhost-user'>
        <source protocol='vhost-user-scsi' path='/tmp/vhost-scsi.sock'></source>
        <alias name="vhost-user-scsi-disk1"/>
    </hostdev>


Type2:

    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native'/>
      <source protocol='vhost-user' path='/tmp/vhost-scsi.sock'>
      </source>
      <target dev='sdb' bus='vhost-user-scsi'/>
      <boot order='3'/>
      <alias name='scsi0-0-0-1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>


    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native'/>
      <source protocol='vhost-user' path='/tmp/vhost-blk.sock'>
      </source>
      <target dev='vda' bus='vhost-user-blk'/>
      <boot order='1'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
    </disk>


Could anyone give some suggestions?

Thanks,
Feng Li

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