[ovirt-users] Nested KVM: what is the correct setup

[ovirt at fateknollogee.com]

>>> You need the VDSM hook (on the hypervisor) that sets up vmx feature
Yes, I did that.

>>> use host passthrough mode for CPU
where is this setting, this is on the VM in Virt-Manager?

On 2017-05-30 09:54, Martin Polednik wrote:
> On 30/05/17 09:42 -0400, ovirt at fateknollogee.com 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)
>> 
>> to check if is enabled do ("kvm_intel" for intel cpu, "kvm_amd" for 
>> AMD)
>> -root at 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 at proxmox:~# cat /sys/module/kvm_intel/parameters/nested
>> Y
>> 
>> Question: what other settings need to be enabled in the guest vm?
> 
> You need the VDSM hook (on the hypervisor) that sets up vmx feature
> flag and use host passthrough mode for CPU.
> 
> https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/nestedvt
> 
>> See "test nested virt" at 
>> https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM
>> Do we need this setting in the vm?
> 
> You don't need to setup anything in the VM.
> 
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