KVM not enabled

[Alfredo De Luca]

Hi all.
I setup a couple of VM in VirtualBox (Ubuntu 12.04.4 LTS) and both don't
have KVM enabled when they are up even if I set virtualization VT-x/AMD-V
(in the attachment).

On the dmesg log I can also see
*kvm: no hardware support*

Of course I tried to put the module kvm/kvm_intel but nothing changed and
also when I try

*sudo kvm-ok *

*INFO: Your CPU does not support KVM extensions*
*KVM acceleration can NOT be used*

I have also another VM and I can't do any virtualizations on it for the
same issue (this time it's a Oracle VM server).

Do you know why? Any clue?

Alfredo

[Gregory Nowak]

Post by Alfredo De Luca
Do you know why? Any clue?

Either your processor doesn't support hardware virtualization, or
hardware virtualization is disabled in your bios. I also seem to
recall that you need to be running a 64-bit operating system to use
hardware virtualization, but I could be wrong there.

Greg

[Kees Nuyt]

Post by Alfredo De Luca
Hi all.
I setup a couple of VM in VirtualBox (Ubuntu 12.04.4 LTS) and both don't
have KVM enabled when they are up even if I set virtualization VT-x/AMD-V
(in the attachment).
On the dmesg log I can also see
*kvm: no hardware support*
Of course I tried to put the module kvm/kvm_intel but nothing changed and
also when I try
*sudo kvm-ok *
*INFO: Your CPU does not support KVM extensions*
*KVM acceleration can NOT be used*
I have also another VM and I can't do any virtualizations on it for the
same issue (this time it's a Oracle VM server).
Do you know why? Any clue?
Alfredo

Virtualization can't be nested.
There can only be one level of hypervisor, you can't run a
hypervisor within a hypervisor.
In your case, VBox is the hypervisor, so KVM cannot run in a VM.

[Alexey Eromenko]

VirtualBox doesn't support nested hardware virtualization.

The good news is that latest 4th gen Intel Haswell processor supports that
(VMCS shadowing feature), so Oracle could enable it in next VirtualBox.

-Technologov

[Alfredo De Luca]

Hi all.
Thanks for that. I was sure VB supported the nesting virtualization.....but
it looks like it doesn't.

So what's the purpose to have VT-x/AMD check box on the VMs?

Regards

Post by Alexey Eromenko
VirtualBox doesn't support nested hardware virtualization.
The good news is that latest 4th gen Intel Haswell processor supports that
(VMCS shadowing feature), so Oracle could enable it in next VirtualBox.
-Technologov
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[Alexey Eromenko]

Post by Alfredo De Luca
So what's the purpose to have VT-x/AMD check box on the VMs?

Increased emulation correctness, 64bit guest, and multiprocessor support.

[Alfredo De Luca]

Fair enough!!

Cheers

Post by Alexey Eromenko

Post by Alfredo De Luca
So what's the purpose to have VT-x/AMD check box on the VMs?

Increased emulation correctness, 64bit guest, and multiprocessor support.
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