Workstation Pro Nested Virtualization not working for my new Intel 12th gen processor powered laptop

[dan_hennessy]

I have two Dell Laptops. One a Dell Precision 7540 with an Intel i7-9850H CPU and the other a Dell Latitude 5530 with an Intel i7-1265U CPU (which includes two Performance-cores and 8 Efficient-cores).

I have a guest VM that runs fine on the i7-9850U but does not boot on the i7-1265U - it gets to the windows logo screen but never gets to the spinning circle of dots. Eventually I have to power off the VM.

The VM uses "Virtualize Intel VT-x/EPT or AMD-V/RVI" to allow nested virtualization. If I disable nested virtualization the VM boots (but obviously does not allow nested virtualization, a necessary feature). If I attach a CD (via iso), it will also boot. Hyper-V is turned off on the host.

I have tried this under Workstation 15, 16 and 17 on both Windows 11 and Windows 10 hosts. All with the same results.

Attached are the logs from both the working host and the failing host, both under Workstation Pro 15.5.7

I have seen some references to this problem but no useable solutions.

Anyone have any ideas?

[Vishal32]

I have the same problem. Please suggest a workaround/fix.

[noxware]

test this

powercfg /powerthrottling disable /path "C:\Program Files (x86)\VMware\VMware Workstation\x64\vmware-vmx.exe"

it works perfectly for me .Host windows 11 prof. alder lake core i7.

now my vm´s are 4 to 5 imes faster!

of course be shure you test the following:

Probably HyperV is installed/pre-configured.

In order to turn off Hyper-V mode, run the following command at the host in windows command-line with Administrator privileges:

bcdedit /set hypervisorlaunchtype off
Reboot the system to activate your changes.

If you want to go back to Hyper-V mode again, then you can enable it like this:

bcdedit /set hypervisorlaunchtype auto
Note that you also might have to disable Memory Integrity.

Windows Security -> Device Security -> Core Isolation details