Guests not starting when another kvm guest is running

Discussions related to using VirtualBox on Linux hosts.
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hasil
Posts: 4
Joined: 7. Aug 2021, 21:50

Guests not starting when another kvm guest is running

Post by hasil »

As title suggests, virtualbox guest machines just hangs to a black screen when I have another kvm guest is running on the same system. Not even the virtualbox efi 'splash screen' is shown. Is this a bug or an expected behavior?

Host OS:
Linux 5.7
Intel x64
Virtualbox installed from official site.

Guest:
Any guest (Linux, windows, macOS)

Failed fixes:
Disable paravirtualization, nested paging.

Logs attached
kde neon-2021-09-01-17-48-01.zip
Logs
(32.95 KiB) Downloaded 5 times
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fth0
Volunteer
Posts: 5661
Joined: 14. Feb 2019, 03:06
Primary OS: Mac OS X other
VBox Version: PUEL
Guest OSses: Linux, Windows 10, ...
Location: Germany

Re: Guests not starting when another kvm guest is running

Post by fth0 »

This is expected behavior, because VT-x cannot be shared. But you can run both guests one after the other without having to reboot the host in between.
hasil
Posts: 4
Joined: 7. Aug 2021, 21:50

Re: Guests not starting when another kvm guest is running

Post by hasil »

Thank you.

Yes I can run both type of guest at different times. Also two kvm or two virtualbox guests can be launched simultaneously so I thought there may be a way to timeshare vt-x.

Have a good day :)
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