[SOLVED] Nested Virtualization

[w00t]

Hi,

Trying to enable nested-KVM, Hardware(Proxmox)->VM->(KVM VM).

For my Proxmox VM I have "host" as CPU-type, and under Options I have "KVM hardware virtualization" ticked for Enabled.

egrep '(vmx|svm)' --color=always /proc/cpuinfo

Within the VM gives me nothing, so no virtualization-availability.

According to https://pve.proxmox.com/wiki/Nested_Virtualization I should go with:

echo "options kvm-amd nested=1" > /etc/modprobe.d/kvm-amd.conf

However, I'm on a intel-platform and a

cat /sys/module/kvm_intel/parameters/nested

outputs a "N". So, I guess the correct command should be:

echo "options kvm-intel nested=Y" > /etc/modprobe.d/kvm-intel.conf

kvm-intel.conf does not exist, is this wiki up to date with latest PVE?

 

[dcsapak]

hi,

except the change from 0|1 to N|Y the guide on the wiki is correct (tested it here)
and yes, your command is correct and should work
(/etc/modprobe.d/kvm-intel.conf does not exist by default)

 

[w00t]

hi,

except the change from 0|1 to N|Y the guide on the wiki is correct (tested it here)
and yes, your command is correct and should work
(/etc/modprobe.d/kvm-intel.conf does not exist by default)

Can confirm,

echo "options kvm-intel nested=Y" > /etc/modprobe.d/kvm-intel.conf

and a reboot enables nested virtualization.

 

[Jeff L]

For kvm-amd, I had to use nested=1. Otherwise, the following would show up in the 'dmesg' output.

[ 5.345816] kvm_amd: `Y' invalid for parameter `nested'
[ 5.375344] kvm_amd: `Y' invalid for parameter `nested'

If anyone else sees a similar issue, perhaps the wiki should be updated.

--------------------------------------------

jeffl@40356m:~$ pveversion -v
proxmox-ve: 4.3-66 (running kernel: 4.4.19-1-pve)
pve-manager: 4.3-1 (running version: 4.3-1/e7cdc165)
pve-kernel-4.4.19-1-pve: 4.4.19-66
lvm2: 2.02.116-pve3
corosync-pve: 2.4.0-1
libqb0: 1.0-1
pve-cluster: 4.0-46
qemu-server: 4.0-88
pve-firmware: 1.1-9
libpve-common-perl: 4.0-73
libpve-access-control: 4.0-19
libpve-storage-perl: 4.0-61
pve-libspice-server1: 0.12.8-1
vncterm: 1.2-1
pve-qemu-kvm: 2.6.1-6
pve-container: 1.0-75
pve-firewall: 2.0-29
pve-ha-manager: 1.0-35
ksm-control-daemon: 1.2-1
glusterfs-client: 3.5.2-2+deb8u2
lxc-pve: 2.0.4-1
lxcfs: 2.0.3-pve1
criu: 1.6.0-1
novnc-pve: 0.5-8
zfsutils: 0.6.5.7-pve10~bpo80
jeffl@40356m:~$