On 5/22/25 11:45, John Thompson via AlmaLinux Users wrote:

My almalinux-9.6 just updated to kernel 5.14.0-570.12.1.el9_6.x86_64 #1 and Virtualbox can no longer load my virtual machines, failing with this error:

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

Anybody else seeing this?

Following up on this, using rmmod to unload the kvm and kvm_intel kernel modules allows VirtualBox to load my virtual machines, but that still begs the question "why did this happen?" Looking at the .config files for the current and older kernels I have on my almalinux machine (5.14.0-503.38.1.el9_5.x86_64, 5.14.0-503.40.1.el9_5.x86_64, and 5.14.0-570.12.1.el9_6.x86_64), I see that CONFIG_X86_VMX_FEATURE_NAMES=y and CONFIG_VMXNET3=m are set in all of them, so why does it fail with VirtualBox only in the latest kernel? And does almalinux support a module blacklist in /etc/modprobe.d to prevent the kvm modules from loading in future reboots? -- -John (JohnDThompson@gmail.com) Appleton, WI USA