[dpdk-dev] [Bug 630] [DPDK 21.02] hotplug_mp/attach_detach_virtio_user: The host display is abnormal after dpdk-hotplug_mp exits

[dpdk-dev] [Bug 630] [DPDK 21.02] hotplug_mp/attach_detach_virtio_user: The host display is abnormal after dpdk-hotplug_mp exits

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=630

            Bug ID: 630
           Summary: [DPDK 21.02] hotplug_mp/attach_detach_virtio_user: The
                    host display is abnormal after dpdk-hotplug_mp exits
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev@dpdk.org
          Reporter: junx.w.zhou@intel.com
  Target Milestone: ---

Environment

DPDK version: Use make showversion or for a non-released version: git remote -v
&& git show-ref --heads
 21.02.0-rc2: 3021257a8111d204dc7741bd67a2502efffb6842

Other software versions: name/version for QEMU, OVS, etc. Repeat as required.
OS: Fedora release 33 (Thirty Three)(5.9.10-200.fc33.x86_64)
Compiler: gcc (GCC) 10.2.1 20201016 (Red Hat 10.2.1-6)
Hardware platform: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
NIC hardware: FVL_eagle(Ethernet Controller X710 for 10GbE SFP+ 1572)
NIC firmware: 
driver: i40e
version: 2.14.13
firmware-version: 8.00 0x80008b82 1.2766.0

Test Setup
Steps to reproduce
List the steps to reproduce the issue.

1.compile hotplug_mp
meson configure -Dexamples=multi_process/hotplug_mp x86_64-native-linuxapp-gcc
ninja -C x86_64-native-linuxapp-gcc

2.bind port on vfio-pci
usertools/dpdk-devbind.py --force --bind=i40e 0000:84:00.0 0000:84:00.1

3.launch testpmd
x86_64-native-linuxapp-gcc/app/dpdk-testpmd  -l 1,2 -n 4  
--file-prefix=vhost_9552_20210131070840 --no-pci --vdev
eth_vhost0,iface=/home/vhost-net -- -i

4.launch dpdk-hotplug_mp in another session
x86_64-native-linuxapp-gcc/examples/dpdk-hotplug_mp   --proc-type=auto

5.execute cmd in dpdk-hotplug_mp
1)attach
net_virtio_user0,mac=00:01:02:03:04:05,path=/home/vhost-net,packed_vq=1,mrg_rxbuf=1,in_order=0
2)detach net_virtio_user0

Show the output from the previous commands.

dpdk-hotplug_mp exits but the host display is abnormal

Expected Result
Explain what is the expected result in text or as an example output:

dpdk-hotplug_mp not exits or dpdk-hotplug_mp exits and the host display is
normal
Regression

Is this issue a regression: (Y)

Version the regression was introduced: 

commit 949735312f5ecb11110e4eec2ece1a20fef99295
Author: Maxime Coquelin <maxime.coquelin@redhat.com>
Date: Tue Jan 26 11:16:35 2021 +0100

net/virtio: move vhost-user specifics to its backend

This patch moves all the Vhost-user backend specific
logic like Vhost FD, listen FD and interrupt handling
to the vhost-user backend implementation.

In order to achieve that, new ops are created to update
the link status, disconnect and reconnect the server,
and fetch the link state interrupt FD.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

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