Patch proposed upstream

https://www.redhat.com/archives/libvir-list/2019-September/msg00496.html

Merged upstream in

commit e0cb57c552b79016535199021dca5296c0ca89a3
Author: Daniel P. Berrangé <berrange>
Date:   Thu Sep 12 16:04:20 2019 +0100

    conf: correctly convert 'managed' attribute from network port
    
    The virNetworkPortDef config stores the 'managed' attribute
    as the virTristateBool type.
    
    The virDomainDef config stores the 'managed' attribute as
    the bool type.
    
    Reviewed-by: Michal Privoznik <mprivozn>
    Signed-off-by: Daniel P. Berrangé <berrange>

Reproduce this bug with libvirt-5.6.0-7.module+el8.2.0+4673+ff4b3b61.x86_64.
Verified this bug with libvirt-5.9.0-1.module+el8.2.0+4682+acceb91e.x86_64 and libvirt-6.0.0-1.module+el8.2.0+5453+31b2b136.x86_64.

Version:
libvirt-5.6.0-7.module+el8.2.0+4673+ff4b3b61.x86_64
qemu-kvm-4.1.0-14.module+el8.2.0+4673+ff4b3b61.x86_64
kernel-4.18.0-171.el8.x86_64

Steps:
1. Setup vfs on physical hosts
# virsh nodedev-dumpxml pci_0000_82_00_1
<device>
  <name>pci_0000_82_00_1</name>
  <path>/sys/devices/pci0000:80/0000:80:02.0/0000:82:00.1</path>
  <parent>pci_0000_80_02_0</parent>
  <driver>
    <name>ixgbe</name>
  </driver>
  <capability type='pci'>
    <class>0x020000</class>
    <domain>0</domain>
    <bus>130</bus>
    <slot>0</slot>
    <function>1</function>
    <product id='0x10fb'>82599ES 10-Gigabit SFI/SFP+ Network Connection</product>
    <vendor id='0x8086'>Intel Corporation</vendor>
    <capability type='virt_functions' maxCount='63'>
      <address domain='0x0000' bus='0x82' slot='0x10' function='0x1'/>
      <address domain='0x0000' bus='0x82' slot='0x10' function='0x3'/>
      <address domain='0x0000' bus='0x82' slot='0x10' function='0x5'/>
      <address domain='0x0000' bus='0x82' slot='0x10' function='0x7'/>
      <address domain='0x0000' bus='0x82' slot='0x11' function='0x1'/>
    </capability>
    <iommuGroup number='42'>
      <address domain='0x0000' bus='0x82' slot='0x00' function='0x1'/>
    </iommuGroup>
    <numa node='1'/>
    <pci-express>
      <link validity='cap' port='0' speed='5' width='8'/>
      <link validity='sta' speed='5' width='8'/>
    </pci-express>
  </capability>
</device>

2. Create virtual network with the vfs above and managed=no
# cat network.xml 
<network>
  <name>pt</name>
  <forward mode='hostdev' managed='no'>
    <driver name='vfio'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x1'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x3'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x5'/>
  </forward>
</network>

# virsh net-define network.xml 
Network pt defined from network.xml

# virsh net-start pt
Network pt started

# virsh net-dumpxml pt 
<network>
  <name>pt</name>
  <uuid>22e3cc60-e126-438c-aca7-2993ec2174d8</uuid>
  <forward mode='hostdev' managed='no'>
    <driver name='vfio'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x1'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x3'/>
    <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x5'/>
  </forward>
</network>

3. Start VM with interface whose source network is the virtual network above
# virsh domstate test82 
shut off

# virsh dumpxml test82 --inactive | grep "<interface" -A9
    <interface type='network'>
      <mac address='52:54:00:0a:98:80'/>
      <source network='pt'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </interface>

# virsh start test82 
Domain test82 started

# virsh dumpxml test82 | grep "<interface" -A9
    <interface type='hostdev' managed='yes'>
      <mac address='52:54:00:0a:98:80'/>
      <driver name='vfio'/>
      <source>
        <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x1'/>
      </source>
      <model type='virtio'/>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </interface>

4. Update the libvrit
# yum update libvirt* -y

# systemctl restart libvirtd

# rpm -qa libvirt
libvirt-5.9.0-1.module+el8.2.0+4682+acceb91e.x86_64

5. Restart VM and check the interface dumpxml again
# virsh destroy test82 ;virsh start test82
Domain test82 destroyed

Domain test82 started

# virsh dumpxml test82 |grep "<interface" -A9
    <interface type='hostdev'>
      <mac address='52:54:00:0a:98:80'/>
      <driver name='vfio'/>
      <source>
        <address type='pci' domain='0x0000' bus='0x82' slot='0x10' function='0x1'/>
      </source>
      <model type='virtio'/>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </interface>

6. Update the libvirt to libvirt-6.0.0-1.module+el8.2.0+5453+31b2b136.x86_64, and then repeat the step-4 and step-5.
The result is same with step-5.

All the test results are as expected, move this bug to be verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:2017