As an example, I have tried to reproduce with the following
configuration:

(k)rafaeldtinoco@win2019crashhost:~$ uname -a
Linux win2019crashhost 5.0.0-34-generic #36-Ubuntu SMP Wed Oct 30 05:16:14 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

----

(k)rafaeldtinoco@win2019crashhost:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 19.10
Release:        19.10
Codename:       eoan

----

(k)rafaeldtinoco@win2019crashhost:~$ virsh dumpxml win2019crash
<domain type='kvm'>
  <name>win2019crash</name>
  <uuid>68ea22b7-7401-45bb-a7b0-a60956081e42</uuid>
  <memory unit='KiB'>8388608</memory>
  <currentMemory unit='KiB'>8388608</currentMemory>
  <vcpu placement='static'>4</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type>
    <boot dev='cdrom'/>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <cpu mode='host-passthrough' check='none'/>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='yes'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/win2019crash/disk01.ext4.qcow2'/>
      <target dev='vda' bus='virtio'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/kwin2019/win2019.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <disk type='file' device='floppy'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/kwin2019/virtio.vfd'/>
      <target dev='fda' bus='fdc'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0' model='piix3-uhci'>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='ide' index='0'>
    </controller>
    <controller type='scsi' index='0' model='lsilogic'>
    </controller>
    <controller type='fdc' index='0'/>
    <interface type='bridge'>
      <mac address='52:54:00:3d:1d:9d'/>
      <source bridge='bridge0'/>
      <model type='virtio'/>
    </interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' 
keymap='en-us'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='16384' heads='1' primary='yes'/>
    </video>
    <memballoon model='virtio'>
    </memballoon>
  </devices>
</domain>

But I saw you're using q35 arch model, so I might give it another try,
and I have tested this in an AMD machine, but I have Intel machine
available to test as well. Having your host's CPU type would also be
great.

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https://bugs.launchpad.net/bugs/1849720

Title:
  Running VM with Virtual NIC Crashes Host OS

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