64-bit Guest and VT-x/AMD-V

Discussions about using Windows guests in VirtualBox.

64-bit Guest and VT-x/AMD-V

Postby mfuszner » 5. Mar 2010, 00:59

I am running XP Pro (64-bit) with SP2 as my host. I am trying to run Server 2008 (64-bit) as a guest OS. When I try to start the VM, I receive the message "VT-x/AMD-V hardware acceleration has been enabled, but is not operational." It goes on to suggest checking the BIOS settings. I have! I have enabled virtualization support as follows:

Intel Virtualization Technology
Intel VT for Direct I/O
Intel Trusted Execution Technology

This Dell Optiplex 960 has full support for virtualization, including BIOS, OS, and motherboard. In fact, I am successfully using the same VM on another identical machine from a hardware standpoint. There has to be a software setting somewhere that is keeping VT-x from being operational. I created a new VM on this PC using the same VDI file as on the one where it works by using an existing virtual hard disk. The usual suggestions to check your BIOS, hardware support, and so forth have already been done. If anyone has any other suggestions, I'd really appreciate it!
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Re: 64-bit Guest and VT-x/AMD-V

Postby Perryg » 5. Mar 2010, 01:08

Do you see hardware virtualization in your bios?
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Re: 64-bit Guest and VT-x/AMD-V

Postby mfuszner » 5. Mar 2010, 04:39

There's nothing that specifically says hardware virtualization, but the vdi file works on another PC built with identical hardware.The first PC (where it works) was where the original installation was done. On the second PC where it is not working, I simply created a new VM and used the VDI file from the working PC.
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Re: 64-bit Guest and VT-x/AMD-V

Postby Perryg » 5. Mar 2010, 05:30

Then it might be that you need to update your bios. Every machine that I have ever used that supported hardware-v in the bios had a setting that said hardware virtualization. Of course you could be the exception. Look at the bios on the other machine that this works in and see if it says hardware virtualization. or at least compare the settings.
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Re: 64-bit Guest and VT-x/AMD-V

Postby BACON » 10. Mar 2010, 02:44

I've seen some cases where enabling virtualization support/extensions in the BIOS doesn't take affect until the machine is completely powered down and unplugged from the power source. So, that might be something to try if you haven't already.
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Re: 64-bit Guest and VT-x/AMD-V

Postby BillG » 10. Mar 2010, 06:59

I agree. You usually need to power down, not simply reboot. I have even heard of instances where the battery has to be removed from a laptop before it will stick.
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