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

[Martin Polednik]

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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