The latest test day kernel-6.12.1-200.fc41.x86_64 was working great for
me until I tried to launch a VirtualBox VM.

"VirtualBox can't operate in VMX root mode. Please disable the KVM
kernel extension, recompile your kernel and reboot
(VERR_VMX_IN_VMX_ROOT_MODE)."

Recompile you kernel?  After I picked myself off the floor and did some
searching I came across a fix that seems to work. Fix is to type the
following:

    sudo modprobe -r kvm_intel

This allows VirtualBox to work however it breaks launching QEMU/KVM
virtual machines until you undo it with this:

    sudo modprobe kvm_intel

This is a bit nasty.  If I boot kernel-6.11.10 I can run VirtualBox and
QEMU/KVM VMs no problem (obviously not at the same time).

Is this expected behavior with 6.12 or is it somehow specific to me?

Can't we have the module unloaded *by default* and have QEMU/KVM load it
as required?  Then unload it when the last VM exits? Seems useless
having it loaded all the time, especially since it breaks VirtualBox.

--
Ian Laurie
FAS: nixuser | IRC: nixuser
TZ: Australia/Sydney

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