Maybe someone from virt team could refer to this.

On Wed, May 27, 2020 at 2:06 PM Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:
On Wed, May 27, 2020 at 11:26 AM Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:
On Wed, May 27, 2020 at 10:21 AM Amit Bawer <abawer@redhat.com> wrote:
From your vdsm log, it seems as occurrence of an issue discussed at https://lists.ovirt.org/archives/list/users@ovirt.org/message/JE76KK2WFDCDJL3DF52OGOLGXWHWPEDA/

2020-05-26 19:51:53,837-0400 ERROR (vm/90f09a7c) [virt.vm] (vmId='90f09a7c-3af1-45a9-a210-78a9b0cd4c3d') The vm start process failed (vm:871)
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 801, in _startUnderlyingVm
    self._run()
  File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 2608, in _run
    dom.createWithFlags(flags)
  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 1166, in createWithFlags
    if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
libvirt.libvirtError: unsupported configuration: unknown CPU feature: tsx-ctrl


On Wed, May 27, 2020 at 9:15 AM Patrick Lomakin <patrick.lomakin@gmail.com> wrote:
I think the problem with a storage connection. Verify your IP addresses on the storage adapter port. Are they connected? After install my ports for storage was deactivated by defaut. Try to connect your iSCSI manually with iscsiadm command and then check your storage connection in storage tab using a host admin portal.

Yes, in that thread I asked if possible to specify in some way an alternate cpu type and/or flags to be setup for self hosted engine vm, without setup to automatically detect/configure it, but I didn't receive an answer.
Because the cpu flag is there also in 4.3.9 but doesn't create problems with self hosted engine or host.

Gianluca 

BTW: is there anything special we can do to help to have this cpu as supported?

model name : Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz

So that others could have better and wider options and also RHV benefit from it?
Also, I now find here below that Cascadelake is supposed to be supported:


Thanks,
Gianluca