[Bug 1036] vhost primary and secondary process symmetric test meet issue

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1036

            Bug ID: 1036
           Summary: vhost primary and secondary process symmetric test
                    meet issue
           Product: DPDK
           Version: 22.03
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev at dpdk.org
          Reporter: xingguang.he at intel.com
  Target Milestone: ---

Prerequisites
-------------
1. Compile symmetric_mp example application::
meson configure -Dexamples=multi_process/symmetric_mp
x86_64-native-linuxapp-gcc
ninja -C x86_64-native-linuxapp-gcc

Steps
-----
1. Launch vhost testpmd as primary process::

./x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 1 -n 4 \
--vdev 'net_vhost,iface=vhost-net,queues=2,client=1' \
--vdev 'net_vhost1,iface=vhost-net1,queues=2,client=1' \
--proc-type=auto -- -p 3 --num-procs=2 --proc-id=0

2. Launch vhost testpmd as secondary process::  

./x86_64-native-linuxapp-gcc/examples/dpdk-symmetric_mp -l 2 -n 4 \
--vdev 'net_vhost,iface=vhost-net,queues=2,client=1' \
--vdev 'net_vhost1,iface=vhost-net1,queues=2,client=1' \
--proc-type=auto -- -p 3 --num-procs=2 --proc-id=1

3. Launch virtio-user::
./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -n 4 -l 7-8 --no-pci
--file-prefix=virtio1 \
--vdev=net_virtio_user1,mac=00:01:02:03:04:05,path=./vhost-net,queues=2,server=1,mrg_rxbuf=0,in_order=0
\
-- -i --nb-cores=1 --rxq=2 --txq=2 --txd=1024 --rxd=1024

when launch virtio-user:
VHOST_CONFIG: (0) device not found.

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