How To Enable Nested KVM so guests can virtualize with hardware extensions

How to check if nested KVM is enabled by doing a cat on nested inside sys

Nested KVM is mainly important for testing for example if you wanted to install VMWare or Proxmox Nodes in a virtual environment for testing.  Without nesting, the performance will be extremely slow, since the VMs within the nodes will not be using Virtualization extensions.

I've used wildcard on kvm_ because it could be kvm_intel or kvm_amd depending on whether you have an AMD or Intel CPU.

AMD returns a 0 or 1 (if enabled)

Intel returns a N or Y (if enabled).

cat /sys/module/kvm_*/parameters/nested

 

Make nested KVM persistent

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

 

Apply nested changes right away:

modprobe -r kvm_intel
modprobe kvm_intel nested=1

 

modprobe -r kvm_amd
modprobe kvm_amd nested=1

 

References:

Enable Nested Virtualization on Virtualbox Howto


Tags:

enable, nested, kvm, virtualize, hardware, extensions, enabled, sys, module, kvm_intel, parameters, echo, quot, intel, etc, modprobe, conf, amd, fatal, reboot,

Latest Articles

  • How to resize a pdf without losing much quality in Linux Mint Ubuntu Debian Redhat Solution
  • qemu: could not load PC BIOS 'bios-256k.bin' solution
  • Proxmox How To Custom Partition During Install
  • Hyper-V Linux VM Boots to Black Screen, Storage, NIC Not Found Issues
  • Ubuntu Mint How to Fix Missing/Broken /dev and /dev/pts which causes terminal to immediately close exit and not work
  • How high can a Xeon CPU get?
  • bash fix PATH environment variable "command not found" solution
  • Ubuntu Linux Mint Debian Redhat Youtube Cannot Play HD or 4K videos, dropped frames or high CPU usage with Nvidia or AMD Driver
  • hostapd example configuration for high speed AC on 5GHz using WPA2
  • hostapd how to enable and use WPS to connect wireless devices like printers
  • Dell Server Workstation iDRAC Dead after Firmware Update Solution R720, R320, R730
  • Cloned VM/Server/Computer in Linux won't boot and goes to initramfs busybox Solution
  • How To Add Windows 7 8 10 11 to GRUB Boot List Dual Booting
  • How to configure OpenDKIM on Linux with Postfix and setup bind zonefile
  • Debian Ubuntu 10/11/12 Linux how to get tftpd-hpa server setup tutorial
  • efibootmgr: option requires an argument -- 'd' efibootmgr version 15 grub-install.real: error: efibootmgr failed to register the boot entry: Operation not permitted.
  • Apache Error Won't start SSL Cert Issue Solution Unable to configure verify locations for client authentication SSL Library Error: 151441510 error:0906D066:PEM routines:PEM_read_bio:bad end line SSL Library Error: 185090057 error:0B084009:x509 certif
  • Linux Debian Mint Ubuntu Bridge br0 gets random IP
  • redis requirements
  • How to kill a docker swarm