Ticket #12350 (new defect)

Opened 19 months ago

Last modified 19 months ago

Hardware Virtualisation support not detected if Hyper-V installed

Reported by: mot256 Owned by:
Priority: major Component: other
Version: VirtualBox 4.3.0 Keywords:
Cc: Guest type: Windows
Host type: Windows


I get the following error (and yes I know this has been reported many times, but please read further): VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.

The issue is that Virtualisation *is* enabled in my BIOS and I also made sure my BIOS is upgraded to the latest version. I also confirmed it with the Coreinfo.exe ( tool. Here is the ouput of that tool:

Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Intel64 Family 6 Model 42 Stepping 7, GenuineIntel
HYPERVISOR      *   Hypervisor is present
VMX             -   Supports Intel hardware-assisted virtualization
EPT             -   Supports Intel extended page tables (SLAT)

Here is the thing: I used VirtualBox on the same machine, but with Windows 7 and I could run exactly the same x64 guest images.


VBox.log Download (79.6 KB) - added by mot256 19 months ago.
Log file

Change History

Changed 19 months ago by mot256

Log file

comment:1 Changed 19 months ago by mhanor

The output of Coreinfo confirms that this is not a VirtualBox issue. VMX is not available (the "minus" sign) and that a hypervisor is already present (the asterisk sign). We can assume it's not VirtualBox's hypervisor.
After enabling VT-x in the BIOS, shutdown the PC/laptop, if the BIOS doesn't do it for you. Do not use any form of standby/hibernation.

comment:2 Changed 19 months ago by mot256

I simply un-installed Hyper-V and it works again. I would like to change this to a suggestion that VirtualBox should please warn you that another virtualisation service/application is running. This will it make it so much clearer why x64 Guests would not start up.

Last edited 19 months ago by mot256 (previous) (diff)

comment:3 Changed 19 months ago by frank

  • Priority changed from blocker to major
  • Summary changed from x64 Hardware Virtualisation support not detected on Windows 8.1 to Hardware Virtualisation support not detected if Hyper-V installed
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