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
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