RHEL 8 virt-manager with qemu-4.2.0, can't connect network

Leek, Jim leek2 at llnl.gov
Sat Jul 10 00:49:56 UTC 2021 

This seems like it should be very easy, so I must be missing something, but I cannot get my guest to communicate with my host or with the internet.   I really jsut need some way to get files across, the guest doesn't even need internet access.
The host is RHEL 8.4, the guest is CentOS 8.
Everything is installed from the yum repos, so it's all default, but my corporate IT environment is pretty locked down.  So that might be related.
I tried to use a shared drive, but apparently that is disabled in RHEL 8.
By default the network is 'NAT' with virtio.
Here's my guest ifconfig:
enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 6c:2b:59:e9:44:50  txqueuelen 1000  (Ethernet)
        RX packets 38  bytes 4953 (4.8 KiB)
        RX errors 0  dropped 7  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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 1840  bytes 159880 (156.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1840  bytes 159880 (156.1 KiB)
        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:a8:4e:b8  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

Here's the command line from the log file:
2021-07-10 00:47:56.514+0000: starting up libvirt version: 6.0.0, package: 35.module+el8.4.0+10230+7a9b21e4 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2021-03-04-13:36:50, ), qemu version: 4.2.0qemu-kvm-4.2.0-48.module+el8.4.0+10368+630e803b, kernel: 4.18.0-305.7.1.el8_4.x86_64, hostname: yonggary.llnl.gov
LC_ALL=C \
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin \
HOME=/var/lib/libvirt/qemu/domain-8-centos8_1 \
XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-8-centos8_1/.local/share \
XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-8-centos8_1/.cache \
XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-8-centos8_1/.config \
QEMU_AUDIO_DRV=spice \
/usr/libexec/qemu-kvm \
-name guest=centos8_1,debug-threads=on \
-S \
-object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-8-centos8_1/master-key.aes \
-enable-fips \
-machine pc-q35-rhel8.2.0,accel=kvm,usb=off,vmport=off,dump-guest-core=off \
-cpu Skylake-Server-IBRS,ss=on,vmx=on,pdcm=on,hypervisor=on,tsc-adjust=on,clflushopt=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,ssbd=on,xsaves=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,skip-l1dfl-vmentry=on,pschange-mc-no=on \
-m 24000 \
-overcommit mem-lock=off \
-smp 2,sockets=2,cores=1,threads=1 \
-uuid d1d4a827-fe87-4c49-9ab2-3b4f52423c2a \
-no-user-config \
-nodefaults \
-chardev socket,id=charmonitor,fd=38,server,nowait \
-mon chardev=charmonitor,id=monitor,mode=control \
-rtc base=utc,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-hpet \
-no-shutdown \
-global ICH9-LPC.disable_s3=1 \
-global ICH9-LPC.disable_s4=1 \
-boot strict=on \
-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 \
-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \
-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 \
-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 \
-device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 \
-device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 \
-device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 \
-device pcie-root-port,port=0x17,chassis=8,id=pci.8,bus=pcie.0,addr=0x2.0x7 \
-device pcie-pci-bridge,id=pci.9,bus=pci.1,addr=0x0 \
-device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 \
-device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 \
-blockdev '{"driver":"file","filename":"/home/leek2/qemu/rhel8_1.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}' \
-device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=libvirt-2-format,id=virtio-disk0,bootindex=1 \
-device ide-cd,bus=ide.0,id=sata0-0-0 \
-netdev tap,fd=40,id=hostnet0,vhost=on,vhostfd=41 \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=6c:2b:59:e9:44:50,bus=pci.7,addr=0x0 \
-chardev pty,id=charserial0 \
-device isa-serial,chardev=charserial0,id=serial0 \
-chardev socket,id=charchannel0,fd=42,server,nowait \
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 \
-chardev spicevmc,id=charchannel1,name=vdagent \
-device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 \
-device usb-tablet,id=input0,bus=usb.0,port=1 \
-spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on \
-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 \
-device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b \
-device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 \
-chardev spicevmc,id=charredir0,name=usbredir \
-device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 \
-chardev spicevmc,id=charredir1,name=usbredir \
-device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 \
-device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 \
-object rng-random,id=objrng0,filename=/dev/urandom \
-device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
-msg timestamp=on
char device redirected to /dev/pts/2 (label charserial0)
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