Created attachment 1752876 [details]
Logs

Description of problem:
A VM fails to start after preview operation with the following errors:
Exit message: XML error: Invalid PCI address 0000:05:00.0. slot must be >= 1.

Engine log:
2021-01-30 13:36:00,911+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ForkJoinPool-1-worker-13) [5bd57035] EVEN
T_ID: VM_DOWN_ERROR(119), VM vm_TestCase18894_3013274002 is down with error. Exit message: XML error: The device at PCI address 0000:00:02.0 canno
t be plugged into the PCI controller with index='0'. It requires a controller that accepts a pcie-root-port.

VDSM Log:
2021-01-30 13:36:04,251+0200 ERROR (vm/9ae75934) [virt.vm] (vmId='9ae75934-56cd-4681-9dc1-586c19a99634') The vm start process failed (vm:951)
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 881, in _startUnderlyingVm
    self._run()
  File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 2800, in _run
    dom = self._connection.defineXML(self._domain.xml)
  File "/usr/lib/python3.6/site-packages/vdsm/common/libvirtconnection.py", line 131, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/vdsm/common/function.py", line 94, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python3.6/site-packages/libvirt.py", line 4063, in defineXML
    if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
libvirt.libvirtError: XML error: The device at PCI address 0000:00:02.0 cannot be plugged into the PCI controller with index='0'. It requires a co
ntroller that accepts a pcie-root-port.

Libvirt Log:
2021-01-30 13:36:04.944+0000: 441843: info : virDBusCall:1555 : DBUS_METHOD_ERROR: 'org.fedoraproject.FirewallD1.direct.passthrough' on '/org/fedoraproject/FirewallD1' at 'org.fedoraproject.FirewallD1' error org.fedoraproject.FirewallD1.Exception: COMMAND_FAILED: '/usr/sbin/ebtables --concurrent -t nat -D PREROUTING -i vnet66 -j libvirt-J-vnet66' failed: ebtables: Bad rule (does a matching rule exist in that chain?)


Version-Release number of selected component (if applicable):
vdsm-4.40.50.3-1.el8ev.x86_64
libvirt-6.6.0-13.module+el8.3.1+9548+0a8fede5.x86_64
ovirt-engine-4.4.5.3-0.14.el8ev.noarch

How reproducible:
100%

Steps to Reproduce:
1. Create a VM from template (RHEL 8.3)
2. Create snapshot s0
3. Preview s0
4. Start VM -> VM fails to start.

Actual results:
VM fails to start.

Expected results:
Operation should succeed.

Additional info:
Ataching art+engine+vdsm+libvirt logs.