[libvirt-users] "scripts are not supported on interfaces of type vhostuser" error

[Michal Privoznik]

On 02/22/2018 05:41 PM, Riccardo Ravaioli wrote:
> Hi,
> 
> I'm having trouble starting a VM with vhostuser interfaces.
> 
> I have a simple configuration where a VM running Debian has 1 vhostuser
> interface plugged into an OVS switch where a DPDK interface is already
> plugged in.
> $ ovs-vsctl show:
> Bridge "switch1"
>     Port "switch1"
>         Interface "switch1"
>             type: internal
>     Port "1.switch1"
>         Interface "1.switch1"
>             type: dpdk
>             options: {dpdk-devargs="0000:0b:00.0"}
>     Port "0.switch1"
>         Interface "0.vm"
>             type: dpdkvhostuserclient
>             options: {vhost-server-path="/opt/oa/vhost/0.vm.sock"}
> 
> 
> The relevant excerpt from the XML of my VM is:
> 
> <?xml version="1.0" ?>
> <domain type="kvm" xmlns:ns0="http://libvirt.org/schemas/domain/qemu/1.0">
>  <!-- [...]  -->
>  <devices>
>     <emulator>/opt/oa/bin/qemu-system-x86_64</emulator>
>     <!-- [...]  -->
>     <interface type="vhostuser">
>       <script path="/opt/oa/etc/qemu-ifup"/>
>       <source mode="server" path="/opt/oa/vhost/0.vm.sock" type="unix"/>
>       <mac address="52:54:00:41:37:08"/>
>       <model type="virtio"/>
>       <driver queues="1">
>         <host csum="off"/>
>       </driver>
>     </interface>
>     <!-- [...]  -->
>   </devices>
>   <ns0:commandline>
>     <ns0:arg value="-object"/>
>     <ns0:arg
> value="memory-backend-file,id=mem,size=2G,mem-path=/dev/hugepages,share=on"/>
>     <ns0:arg value="-numa"/>
>     <ns0:arg value="node,memdev=mem"/>
>     <ns0:arg value="-mem-prealloc"/>
>   </ns0:commandline>

Unrelated, to avoid command line passthrough you can do:

  <domain>
    <memoryBacking>
      <hugepages/>
    </memoryBacking>
    ..
    <cpu>
      <numa>
        <cell id='0' cpus='$CPUS' memory='$MEM' memAccess='shared'/>
      </numa>
    </cpu>
    ..
  </domain>

Michal