Opened 8 years ago
Last modified 8 years ago
#16017 new defect
Only one CPU usable Windows 10 Hyper-V Bug
| Reported by: | horvan | Owned by: | |
|---|---|---|---|
| Component: | host support | Version: | VirtualBox 5.1.6 |
| Keywords: | Windows 10, Hyper-V, CPU | Cc: | |
| Guest type: | Linux | Host type: | Windows |
Description
Suddenly I couldn't select the amount of cpus to offer to a newly created virtual machine. Even old ones had only one cpu and wouldn't start anymore.
The issue seems to be related to a Hyper-V Installation on Windows 10 Pro. When you Install Hyper-V for some reason Virtual Box will be broken
Reproduce
- Instll Virtual Box as usual on Windows 10 Pro
- Create a Machine with more than 1 Processor
- Now activate the Hyper-V Feature from the System Settings Programms and Features dialog
- Wait for Windows to complete tehe setup
- Try to change the amound of cpus used by your virtual machine in Virtualbox
The Feature should be grayed out now
So Hyper-V seems to break VirtualBox by now!
You can re enable the processor feature by uninstalling the Hyper-V feature in Windows 10 Pro
I am not sure if Windows 7 is also afected. Needs Teting
Note:
See TracTickets
for help on using tickets.
There is nothing to test. This is a well known problem as a 2-minute search either here or in the forums would have shown you. It's a Microsoft issue where they take over the VT-x and they don't allow anyone else to use it. From the FAQ: I have a 64bit host, but can't install 64bit guests.
For future reference, it's better/faster if crashes and other problems get first triaged in the forums (https://forums.virtualbox.org/). 95% of the issues are resolved over there, which keeps the developers focusing on the bug fixes and enhancements...