BOINC
VirtualBox can't be blamed this time
The bug I'm running on VirtualBox 6.1.32 and I have 4 virtual machines of my own.They are able to run normally when Hyper-V is open ,though Hyper-V cannot run when VirtualBox is even only installed.However lhc@home shows CPU virtualization support is off.So do GPUGrid.Only after I disabled Hyper-V through bcdedit and then restart can I run lhc@home again.It seems that,it's boinc who fights with Hyper-V,not VBox.
Reproduce I haven't tried to.
System Info Win11 BOINC 7.20.2 VirtualBox 6.1.32
Yes it can be reproducted simply by
bcdedit /set hypervisorlaunchtype auto then restart
By default Hyper-V will disable VirtualBox when it detects that the other hypervisor is installed, this is because they can't both be using the virtualization (VT-x) on the CPU at the same time. There are ways around that (https://www.how2shout.com/how-to/use-virtualbox-and-hyper-v-together-on-windows-10.html) but you'll have to test whether that works that way on Windows 11 as well.
The above will allow VirtualBox to use Hyper-V as the hypervisor of choice. BOINC can only work with VirtualBox not with any other hypervisor. A quick search shows that in #1974 the developers thought of adding Hyper-V support, but decided against it as it isn't supported in Windows 10 Home Edition.
Yes I was using as that link says, the paravirtualization interface was set to Hyper-V, and my own vm was working all right, that's the problem. Besides, Windows 10 Home is able to run Hyper-V service. It's easily searched that you only need to run this bat:
pushd "%~dp0"
dir /b %SystemRoot%\servicing\Packages\*Hyper-V*.mum >hv.txt
for /f %%i in ('findstr /i . hv.txt 2^>nul') do dism /online /norestart /add-package:"%SystemRoot%\servicing\Packages\%%i"
del hv.txt
Dism /online /enable-feature /featurename:Microsoft-Hyper-V -All /LimitAccess /ALL
Pause
BOINC devs, see https://www.how2shout.com/how-to/download-and-install-hyper-v-on-windows-10-home.html for how to do this. I'm not sure we'd want to add something to the user's computer without their express acknowledgment.
Anyway the problem is that VirtualBox is working all right but BOINC shows no virtualization support.
