Encountering the frustrating error “VT-x is disabled in the BIOS for both all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)” can halt your virtualization projects in their tracks. This error, commonly seen in virtualization software like VirtualBox and VMware, indicates that your computer’s processor isn’t properly configured to support virtual machines. This can happen even if your CPU does support virtualization features. We’ll explore the root causes, delve into BIOS settings, and provide a step-by-step guide to resolving this issue, getting you back to running virtual machines smoothly. We will also cover understanding the error message, the role of virtualization technology, and troubleshooting steps to reactivate VT-x. This guide will ensure you can leverage the power of virtualization without being hampered by this common problem.

Understanding the VERR_VMX_MSR_ALL_VMX_DISABLED Error

The “VERR_VMX_MSR_ALL_VMX_DISABLED” error, as displayed by virtualization software, signifies that the Virtual Machine Extensions (VMX), specifically VT-x (Intel Virtualization Technology) or AMD-V (AMD Virtualization), is not enabled at the hardware level. This means the virtualization software cannot access the necessary CPU instructions to run virtual machines. The “MSR” part of the error refers to Model-Specific Registers, which are registers within the CPU that control various hardware features, including virtualization. When VT-x is disabled, the MSRs responsible for virtualization are locked, preventing the software from utilizing them.

The error often arises when the virtualization feature is disabled in your computer’s BIOS or UEFI firmware. It can also be triggered by other software, like certain security programs or hypervisors (such as Hyper-V), that might be claiming exclusive access to the virtualization capabilities of the CPU. To fix this, it’s crucial to confirm that VT-x/AMD-V is enabled in the BIOS/UEFI, and that no other software is interfering with the virtualization functionality. A common misconception is that simply having a CPU that supports virtualization is enough; the feature needs to be explicitly enabled.

According to Intel, “Virtualization Technology (VT-x) allows one hardware platform to function as multiple ‘virtual’ platforms. It offers improved manageability by limiting downtime and maintaining productivity by isolating computing activities into separate partitions.” Intel’s official documentation provides further insights into the benefits and functionality of VT-x. This error, therefore, prevents you from reaping these benefits.

Accessing and Modifying BIOS/UEFI Settings

To enable VT-x, you’ll need to access your computer’s BIOS or UEFI settings. The method for accessing these settings varies depending on the manufacturer of your motherboard. Typically, you’ll need to press a specific key (such as Delete, F2, F12, or Esc) during the computer’s startup sequence, before the operating system begins to load. Consult your motherboard’s manual or the manufacturer’s website for the correct key. Once you’re in the BIOS/UEFI, navigate to the “Advanced,” “Configuration,” or “Security” section. Look for options related to “Virtualization Technology,” “VT-x,” “AMD-V,” or similar terms. Enable the corresponding setting.

The exact wording and location of the virtualization setting can vary significantly between different BIOS/UEFI versions. Some manufacturers might hide the setting under a submenu, such as “CPU Configuration” or “Chipset Features.” Be patient and carefully examine each section. Once you’ve found and enabled VT-x/AMD-V, save the changes and exit the BIOS/UEFI. Your computer will then restart. It is very important to save the changes before exiting, or the settings will revert to their previous state. This is a very common mistake.

It’s also important to ensure that your BIOS/UEFI is up to date. Outdated firmware can sometimes cause compatibility issues or prevent virtualization features from working correctly. Check your motherboard manufacturer’s website for the latest BIOS/UEFI version and instructions on how to update it. Updating the BIOS can be risky if not done correctly, so follow the manufacturer’s instructions precisely. According to a study by Phoenix Technologies, updating UEFI firmware can improve system stability and performance by up to 15%. Phoenix Technologies is a leading provider of UEFI firmware.

Troubleshooting Common Issues and Conflicts

Even after enabling VT-x in the BIOS/UEFI, you might still encounter the “VERR_VMX_MSR_ALL_VMX_DISABLED” error. This can occur due to conflicts with other software or incorrect system configurations. One common culprit is Hyper-V, a built-in virtualization platform in Windows. If Hyper-V is enabled, it can interfere with VirtualBox or VMware. To disable Hyper-V, go to “Control Panel” -> “Programs” -> “Turn Windows features on or off.” Uncheck “Hyper-V” and restart your computer.

Another potential issue is the presence of certain security software, such as antivirus programs, that might be blocking virtualization features. These programs sometimes have settings that prevent virtual machines from running, either for security reasons or due to compatibility issues. Check the settings of your security software and make sure it’s not interfering with virtualization. Temporarily disabling the security software (at your own risk) can help determine if it’s the cause of the problem.

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If you’ve enabled VT-x in the BIOS, disabled Hyper-V, and checked your security software, but still face the error, try running the command “bcdedit /set hypervisorlaunchtype off” in an elevated command prompt (run as administrator) and restart your computer. This command disables the Windows hypervisor, which can sometimes conflict with other virtualization software. This is a powerful command, so use it with caution and only if other solutions have failed. You can revert the changes with “bcdedit /set hypervisorlaunchtype auto”.

• Check for Hyper-V and disable it.
• Review security software settings.

Step-by-Step Guide to Reactivating VT-x

Here’s a structured approach to reactivating VT-x and resolving the “VERR_VMX_MSR_ALL_VMX_DISABLED” error:

1. Restart your computer: This ensures a clean slate for troubleshooting.
2. Access BIOS/UEFI settings: Press the appropriate key during startup (Del, F2, F12, Esc).
3. Locate virtualization settings: Navigate to “Advanced,” “Configuration,” or similar sections.
4. Enable VT-x/AMD-V: Find the virtualization option and enable it.
5. Save and exit BIOS/UEFI: Save the changes and restart your computer.
6. Disable Hyper-V (if applicable): Go to “Turn Windows features on or off” and uncheck “Hyper-V.”
7. Check security software: Ensure your antivirus isn’t blocking virtualization.
8. Run the “bcdedit” command (if necessary): Execute “bcdedit /set hypervisorlaunchtype off” in an elevated command prompt.
9. Test your virtual machine: Launch VirtualBox or VMware and try running your VM.

If, after following these steps, you’re still encountering the issue, consider updating your motherboard’s BIOS/UEFI to the latest version. Remember to back up any important data before making changes to your system’s configuration. Ensuring compatibility between your hardware, operating system, and virtualization software is key to a smooth and successful virtualization experience. For further assistance, consult the documentation for your specific virtualization software. Find more virtualization support here.

• Update your BIOS/UEFI if necessary.
• Consult virtualization software documentation.

Q: What does "VERR\_VMX\_MSR\_ALL\_VMX\_DISABLED" mean?

A: It means Virtualization Technology (VT-x) or AMD Virtualization (AMD-V) is disabled in your BIOS/UEFI or is being blocked by another program, preventing virtualization software from running virtual machines.

Q: How do I know if my CPU supports VT-x?

A: You can check your CPU's specifications on the manufacturer's website (Intel or AMD). Look for features related to virtualization technology.

Q: Can I enable VT-x from within Windows?

A: No, VT-x must be enabled in the BIOS/UEFI settings, which are accessed before the operating system loads.

Q: Is it safe to disable Hyper-V?

A: Yes, disabling Hyper-V is generally safe, especially if you're not using it for other purposes. It can resolve conflicts with other virtualization software.

Q: What if I can't find the VT-x setting in my BIOS?

A: Consult your motherboard's manual or the manufacturer's website for specific instructions. The setting might be hidden under a different name or submenu. If your BIOS is very old, you might need to update it.

Question & Answer :
Downloaded Xamarin Android Player and with >>next>> progress installed Virtual Box.

When I tried to start an emulator I got

Failed to initialized device (name Of the emulator) VboxManager Commendt Failed 

and the detail of the error in Oracle Vm Virtualbox is

VT-x is disabled in the BIOS for both all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED) 

How can I fix this?

I have found the solution of my problem, put some images to help others, thanks go here

It is a RAM related issue. The documentation is self explanatory:

You are trying to allocate >3GB of RAM to the VM. This requires: (a) a 64 bit host system; and (b) true hardware pass-through ie VT-x.

Fast solution

Allocate less than 3GB for the virtual machine.

Complete solution

1. Make sure your system is 64 bit.
2. Enable virtualisation in your host machine. You can find how to do it here or there are many other resources available on Google.