在fedora 32中找不到kvm虛擬機橋接網路

我在我的 Fedora 32 機器上配置一個橋接網路，這是我的 ifconfig 輸出：

[root@MiWiFi-R4CM-srv network-scripts]# ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
       inet 192.168.31.2  netmask 255.255.255.0  broadcast 192.168.31.255
       inet6 fe80::4b2:78ff:fe35:2c73  prefixlen 64  scopeid 0x20<link>
       ether 06:b2:78:35:2c:73  txqueuelen 1000  (Ethernet)
       RX packets 104  bytes 13776 (13.4 KiB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 412  bytes 76686 (74.8 KiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

bridge0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
       inet 192.168.31.178  netmask 255.255.255.0  broadcast 192.168.31.255
       inet6 fe80::b18b:62f0:b07f:1be6  prefixlen 64  scopeid 0x20<link>
       ether 06:0c:7d:51:ea:71  txqueuelen 1000  (Ethernet)
       RX packets 31618  bytes 2354837 (2.2 MiB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 13625  bytes 100610583 (95.9 MiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
       inet 192.168.31.72  netmask 255.255.255.0  broadcast 192.168.31.255
       inet6 fe80::7903:4d64:5ea0:3339  prefixlen 64  scopeid 0x20<link>
       ether 2c:f0:5d:2c:6e:d5  txqueuelen 1000  (Ethernet)
       RX packets 61756  bytes 26903282 (25.6 MiB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 87934  bytes 108103869 (103.0 MiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
       device interrupt 16  memory 0xa1200000-a1220000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
       inet 127.0.0.1  netmask 255.0.0.0
       inet6 ::1  prefixlen 128  scopeid 0x10<host>
       loop  txqueuelen 1000  (Local Loopback)
       RX packets 5913  bytes 1277029 (1.2 MiB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 5913  bytes 1277029 (1.2 MiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
       inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
       ether 52:54:00:39:c6:9f  txqueuelen 1000  (Ethernet)
       RX packets 0  bytes 0 (0.0 B)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 0  bytes 0 (0.0 B)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vnet0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
       inet6 fe80::fc54:ff:fe36:a8ef  prefixlen 64  scopeid 0x20<link>
       ether fe:54:00:36:a8:ef  txqueuelen 1000  (Ethernet)
       RX packets 28  bytes 3449 (3.3 KiB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 103  bytes 16899 (16.5 KiB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

這是我的網路連接配置：

但是當我在 kvm 虛擬管理器中配置 kvm 虛擬機網橋時，我找不到網橋 br0。我應該怎麼做才能使 br0 對 kvm 虛擬機可用？

網橋介面不出現在此列表中。您必須選擇“指定共享設備名稱”，然後在出現的文本框中輸入您希望使用的網橋介面的名稱。

引用自：https://serverfault.com/questions/1023977