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+
+Multi-queue vhost-user fails to reconnect with qemu version >=4.2
+
+Test Environment:
+DPDK version: DPDK v20.08
+Other software versions: qemu4.2, qemu5.0.
+OS: Linux 4.15.0-20-generic
+Compiler: gcc (Ubuntu 7.3.0-16ubuntu3) 8.4.0
+Hardware platform: Purley.
+Test Setup
+Steps to reproduce
+List the steps to reproduce the issue.
+
+Test flow
+=========
+1. Launch vhost-user testpmd as port0 with 2 queues:
+
+./x86_64-native-linuxapp-gcc/app/testpmd -l 2-4 -n 4 \
+    --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net,queues=2,client=1' -- -i --txd=1024 --rxd=1024 --txq=2 --rxq=2
+testpmd>start
+
+3. Launch qemu with virtio-net:
+
+ taskset -c 13 \
+    qemu-system-x86_64 -name us-vhost-vm1 \
+       -cpu host -enable-kvm -m 2048 -object memory-backend-file,id=mem,size=2048M,mem-path=/mnt/huge,share=on \
+       -numa node,memdev=mem \
+       -mem-prealloc -monitor unix:/tmp/vm2_monitor.sock,server,nowait -netdev user,id=yinan,hostfwd=tcp:127.0.0.1:6005-:22 -device e1000,netdev=yinan \
+       -smp cores=1,sockets=1 -drive file=/home/osimg/ubuntu16.img  \
+       -chardev socket,id=char0,path=./vhost-net,server \
+       -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce,queues=2 \
+       -device virtio-net-pci,mac=52:54:00:00:00:01,netdev=mynet1,mrg_rxbuf=on,csum=on,gso=on,host_tso4=on,guest_tso4=on,mq=on,vectors=15 \
+       -vnc :10 -daemonize
+
+6. Quit testpmd and restart vhost-user :
+
+testpmd>quit
+./x86_64-native-linuxapp-gcc/app/testpmd -l 2-4 -n 4 \
+    --file-prefix=vhost --vdev 'net_vhost0,iface=vhost-net,queues=2,client=1' -- -i --txd=1024 --rxd=1024 --txq=2 --rxq=2
+
+
+Expected Result:
+After the vhost-user is killed then re-launched, the virtio-net can connect back to vhost-user again.
+
+Actual Result:
+Vhost-user relaunch failed with continous log printed"VHOST_CONFIG: Processing VHOST_USER_SET_FEATURES failed.
+
+Analysis:
+This is a regression bug, bad commit: c6beefd674f
+When vhost-user quits, QEMU doesnot save acked features for each virtio-net after vhost-user quits. When vhost-user reconnects to QEMU, QEMU sends two different features(one is the true acked feature while the another is 0x40000000) to vhost-user successively which causing vhost-user exits abnormally.
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