But one of the questions already asked to you also throughout the other thread was:

what hypervisor are you using?
CentOS-7 v 1611
Question << What hypervisor should I be using??

More precisely, as it is clear it is Qemu-KVM, what is the way you start your VMs that are the candidates to become hypervisors in oVirt?
Not sure I understand this question?

Is it with virt-manager, as described in one of the links you provided, or direct virsh commands or what?
Virt-Manager

If you are using virt-manager, what did you specify in CPUs --> Configuration --> Model ?
Great question, my answer = none

Did you choose the checkbox to "copy host cpu configuration"?
Great question, my answer = no

On 2017-05-30 09:56, Gianluca Cecchi wrote:
On Tue, May 30, 2017 at 3:42 PM, <[email protected]> wrote:

Host: CentOS-7_v1611 (or Fedora 25 -my personal fav)
VMs: oVirt nodes v4.1.2

To setup nested KVM, I follow these
instructions(https://pve.proxmox.com/wiki/Nested_Virtualization [1])

to check if is enabled do ("kvm_intel" for intel cpu, "kvm_amd" for
AMD)
-root@proxmox:~# cat /sys/module/kvm_intel/parameters/nested
N
(N means it's not, to enable ("kvm-intel" for intel, "kvm-amd" for
AMD):)

# echo "options kvm-intel nested=Y" > /etc/modprobe.d/kvm-intel.conf
and reboot or reload the kernel modul

modprobe -r kvm_intel
modprobe kvm_intel
check again

-root@proxmox:~# cat /sys/module/kvm_intel/parameters/nested
Y

Question: what other settings need to be enabled in the guest vm?
See "test nested virt" at

https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM
[2]
Do we need this setting in the vm?
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But one of the questions already asked to you also throughout the
other thread was:
what hypervisor are you using?
More precisely, as it is clear it is Qemu-KVM, what is the way you
start your VMs that are the candidates to become hypervisors in oVirt?
Is it with virt-manager, as described in one of the links you
provided, or direct virsh commands or what?
If you are using virt-manager, what did you specify in CPUs -->
Configuration --> Model ?
Did you choose the checkbox to "copy host cpu configuration"?

Gianluca

Links:
------
[1] https://pve.proxmox.com/wiki/Nested_Virtualization
[2] https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM
[3] http://lists.ovirt.org/mailman/listinfo/users
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