Description of problem:

Brand new VM, click on CPUs and I consistently get an error message.


Version-Release number of selected component (if applicable):
virt-manager-2.2.1-3.fc32.noarch

qemu-kvm-5.0.0-5.fc33.x86_64
libvirt-daemon-6.6.0-1.fc33.x86_64
edk2-ovmf-20200201stable-5.fc33.noarch
xorg-x11-drv-qxl-0.1.5-16.fc33.x86_64
kernel-5.8.0-1.fc33.x86_64


How reproducible:
Always


Steps to Reproduce:
1. Clean install Fedora-Workstation-Live-x86_64-33-20200813.n.2.iso
2. dnf group install virtualization
3. Create a new UEFI or BIOS VM using virt-manager
4. Click on show virtual machine details (lightbulb icon)
5. Click on CPUs

Actual results:

Error refreshing hardware page: attrib must be dict, not NoneType

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/details/details.py", line 1025, in hw_selected
    self.refresh_config_cpu()
  File "/usr/share/virt-manager/virtManager/details/details.py", line 2223, in refresh_config_cpu
    if not self._cpu_secure_is_available():
  File "/usr/share/virt-manager/virtManager/details/details.py", line 2167, in _cpu_secure_is_available
    features = domcaps.get_cpu_security_features()
  File "/usr/share/virt-manager/virtinst/domcapabilities.py", line 308, in get_cpu_security_features
    cpu = self._get_expanded_cpu(m)
  File "/usr/share/virt-manager/virtinst/domcapabilities.py", line 273, in _get_expanded_cpu
    cpuXML = self._convert_mode_to_cpu(mode.get_xml())
  File "/usr/share/virt-manager/virtinst/domcapabilities.py", line 267, in _convert_mode_to_cpu
    root.attrib = None
TypeError: attrib must be dict, not NoneType
[chris@fmac ~]$ 



Expected results:


Should not get an error.


Additional info:



If I connect remotely from Fedora 32, also with virt-manager-2.2.1-3.fc32.noarch, the error doesn't happen. Must actually be a libvirt bug but I'm not sure what's really complaining.