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>
</domain>
Now, if I try to start my VM, I get the following error and the VM is not
started at all:
$ virsh create vm.xml
error: Failed to create domain from vm.xml
error: unsupported configuration: scripts are not supported on interfaces
of type vhostuser
The logs from libvirtd.log say:
2018-02-22 09:18:24.982+0000: 2033: warning :
qemuProcessStartWarnShmem:4539 : Detected vhost-user interface without any
shared memory, the interface might not be operational
2018-02-22 09:18:24.982+0000: 2033: error : qemuBuildHostNetStr:3894 :
unsupported configuration: scripts are not supported on interfaces of type
vhostuser
The logs from qemu simply say:
2018-02-22 09:26:15.857+0000: shutting down, reason=failed
And finally, ovs-vswitchd.log:
2018-02-22T09:18:24.715Z|00328|dpdk|INFO|VHOST_CONFIG: vhost-user client:
socket created, fd: 51
2018-02-22T09:18:24.716Z|00329|netdev_dpdk|INFO|vHost User device '0.vm'
created in 'client' mode, using client socket '/opt/oa/vhost/0.vm.sock'
2018-02-22T09:18:24.718Z|00330|dpdk|WARN|VHOST_CONFIG: failed to connect to
/opt/oa/vhost/0.vm.sock: No such file or directory
2018-02-22T09:18:24.718Z|00331|dpdk|INFO|VHOST_CONFIG:
/opt/oa/vhost/0.vm.sock: reconnecting...
2018-02-22T09:18:24.718Z|00332|bridge|INFO|bridge switch1: added interface
0.vm on port 5
Am I missing something on the openvswitch or on the libvirt side?
It looks like openvswitch can't find /opt/oa/vhost/0.vm.sock, but isn't
either openvswitch or libvirt in charge of creating it?
Then, I'm not too sure about the error messages in libvirtd.log...
My software versions are: libvirt 3.10.0, qemu 2.10.2, openvswitch 2.8.1
and DPDK 17.11.
Thanks a lot!
Riccardo
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