VT-x issues

[larosa360]

Hi all,

MY ISSUE
I appear to have an issue that I cannot find a resolution for on the interwebs. My Ubuntu 14.04.03, LTS 64bit, 8gb ram, I7 processor apparently cannot run a 64 bit vm. I just cannot believe this.

Effects of this issue - I cannot create a 64 bit vm, My acceleration tab is grey, VB telling me VT-x is not enabled when it is.

Attempts to solve the issue. - Reboot after enabling virtualization and VT-x then I did a full system power down and restart. Reinstalled VB. Reinstalled my OS.

Any help on solving this issue would be extremely appreciated. Thanks!

[Perryg]

If you are sure that you have enabled hardware virtualization in bios then something must be using VMX. Do you have a xen or kvm kernel?

[larosa360]

I am fairly sure its kvm.

sudo xl list returns xl is currently not installed.

[Virtual Charles]

Hi,

Any clues about this? It seems I am in the same boat.

I installed the latest VirtualBox 5.0.8 + Oracle extensions on my Linux Mint 17.1 (Ubuntu 14.04) system. The System->Acceleration tab is not available.

Output from uname: Linux desktop-host 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Processor: Intel Core i5-2400
grep vmx /proc/cpuinfo shows vmx is present.

What is the effect of a "xen or kvm" kernel? Is this required? Or should it be disabled? How do I find out? I am using the stock kernel and have not changed any kernel config.

Thanks for the help,

Charles

[Perryg]

What is the effect of a "xen or kvm" kernel? Is this required? Or should it be disabled? How do I find out? I am using the stock kernel and have not changed any kernel config.

KVM might not be an issue but xen will be. Remove and see if you finally have VMX available to VirtualBox.

This might also help
FAQ: I have a 64bit host, but can't install 64bit guests.

[Virtual Charles]

Thanks! That was a big help.

The problem turned out to be in the BIOS. The VT-x option was buried deeply and disabled. Now it is on and things work as they should!

Charles