How to enable Virtualbox nested VTX/Amd-V

Do you want to run Virtual machine inside a Virtual Box VM then you have to enable the nested virtualization? But how? Here in this tutorial, we let you know the command to enable nested VTX/Amd-V option in VirtualBox if that appears grey and you are unable to check its box.

What is nested Vt x AMD V?

In simple words, when we run a virtual machine inside some existing virtual machine is called nested virtualization. For example, if you have VirtualBox installed on your system and inside that, you run another virtualization environment such as Hyper-V on Windows guest operating system or KVM/VirtualBox on Linux distro.

However, in VirtualBox, we have nested virtualization option but in grey out, I mean we can’t check its box to enable the same, at least in my case I couldn’t. And if you are seeing the same problem in your Virtual Box and want to enable nested VTX/Amd-V for any guest operating system then use the command given in this article.

Enable Virtualbox nested VTX/AMD-V

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The steps given here are the same for any operating system where you have the VirtualBox installed…

Step 1: Open command terminal

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On Windows 10/7 or some previous version run the command prompt with administrative rights whereas for macOS or Linux distros (Ubuntu, CentOS, Linux Mint, Debian etc.) use the command terminal.

Step 2: Run the modifyvm command

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Now the second step is to run a command to make the nested virtualization accessible.

VBoxManage modifyvm VM-name --nested-hw-virt on

Note: Replace the VM-name with the VM or Guest operating system name for which you want to enable the nested VTX/AMD-V.

For example, we have Proxmox named VM on Vbox, thus the command will be like this:

VBoxManage modifyvm proxmox --nested-hw-virt on

Step 3: Enable nested VTX/Amd-V option

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Now, open the VirtualBox software installed on your host operating system and select the VM for which you have enabled it. For example, we want to this nested virtualization for Proxmox bare-metal platform and activated for the same, thus we select it. You can select the guest VM used in the above command.

After selecting the VM, click on the Settings option given in the VBox menu.

Now, from the left side panel select the System settings->Processor Tab and then check the box of the option called “Enable Nested VT-x/AMD-V” and hit the OK button.

That’s it, now you can install and start virtual machines inside your VirtualBox.