Virtualbox modules CONFIG_PREEMPT_NOTIFIERS (solved)

[cameta]

After an update to /virtualbox-modules-7.1.10 I have the next message:

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* Messages for package app-emulation/virtualbox-modules-7.1.10:

 *   CONFIG_PREEMPT_NOTIFIERS:   is not set when it should be.
 * Please check to make sure these options are set correctly.
 * Failure to do so may cause unexpected problems.

What it means? How can I correct it?

My kernel config.

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CONFIG_PREEMPT_BUILD=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_COUNT=y
CONFIG_PREEMPTION=y
CONFIG_PREEMPT_DYNAMIC=y
# CONFIG_SCHED_CORE is not set

[pietinger]

You can always search in "make menuconfig" with /

I searched for "PREEMPT_NOTIFIERS" (you dont need a leading CONFIG_) and got:

1. Selected by KVM_COMMON

Search again with "KVM_COMMON" and I got:

2. Selected by KVM_X86 && VIRTUALIZATION

Okay "VIRTUALIZATION" is direct in the main menu, so search only for KVM_X86 ->

It is an computed option; but <Help> tells you the location: Defined at arch/x86/kvm/Kconfig:20

3. ->

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 config KVM_X86
        def_tristate KVM if (KVM_INTEL != n || KVM_AMD != n)

So, you need:

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[*] Virtualization  --->
    [*]   Kernel-based Virtual Machine (KVM) support
    [*]     KVM for Intel (and compatible) processors support
-- or --    
    [*]     KVM for AMD processors support

[cameta]

Thank you. It worked like a charm.

[pietinger]

Thank you. It worked like a charm.

Happy to hear that ... and you are very Welcome!

[pcmaster]

Same problem, but if i enable kvm support virtualbox modules build OK, but when i try to init a virtual machine i get this error:

VirtualBox can't enable the AMD-V extension. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_SVM_IN_USE).

[Warped_Dragon]

I ran in to the exact same problem.

The solution is:

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[*] Virtualization  --->
    [M]   Kernel-based Virtual Machine (KVM) support
    [M]     KVM for Intel (and compatible) processors support
-- or --   
    [M]     KVM for AMD processors support

And then do not actually load the module.