Enabling the VT-x inside a virtual machine
Solution 1
@asked There are three most common reasons for this error:
- Your CPU doesn’t support VT-x or AMD-V virtualization
- VT-x or AMD-V is not enabled in BIOS (UEFI)
- You have Hyper-V virtualization enabled in Windows
Solution 2
You can't enable VT-x inside Virtualbox. There's a ticket for it that hasn't been fixed yet
[Edit by klaus 2018-05-06:]
This feature is being worked on for a while. Once the implementation is complete and tested it will be available to all users.
It's possible to run nested VMs with Hyper-V and VMWare ESX or ESXi though
- Run Hyper-V in a Virtual Machine with Nested Virtualization
- How to enable VT-X on VM
- Is it possible to use VMX CPU instructions inside VM?
- How to enable VT-x inside a Virtual Machine inside a Virtual Machine
- Is it possible to setup a virtual machine inside another virtual machine
- How to run VMWare ESX or ESXi in a virtual machine?
- Nested virtualization - is it possible?
However it does need EPT to run. Make sure your host CPU has EPT support. Without EPT you can only run 32-bit VMs using binary translation
- Intel VT-x or AMD-V is required for running “Nested Virtualization” which supports nested 32-bit VMs
- Intel EPT or AMD RVI is required for running nested 64-bit VMs.
https://www.virtuallyghetto.com/2012/08/how-to-enable-nested-esxi-other.html
Some hypervisors do refuse to run if it found out that it's running inside a virtual machine or in a virtual machine some levels deep. That said, it's possible to run arbitrarily deep nested virtual machines using binary translation or an emulator like Bochs or qemu
user3032925
Updated on June 04, 2022Comments
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user3032925 almost 2 years
I work in Ubuntu from Oracle Virtual Machine which is installed on top of Windows.
I have activated the VT-x feature in the host BIOS. After this I created a new virtual machine with VT-x and EPT enabled.
Now I run
$ egrep '(vmx|svm)' /proc/cpuinfo
from the guest to check if the vmx feature is enabled and the answer is 0, i.e. not enabled.
How can I enable this feature on the guest VM?