HELP - virtualbox-guest-additions not starting

Moriah

I'm running virtualbox on a windows-10 host with a gentoo guest. I'm having trouble getting virtualbox-guest-additions to start:

fedeliallalinea · Posted: Sat Dec 26, 2020 6:58 am Post subject:

What return modinfo vboxsf command?
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Moriah · Posted: Sat Dec 26, 2020 4:47 pm Post subject:

Moriah · Posted: Sat Dec 26, 2020 5:01 pm Post subject:

fedeliallalinea · Posted: Sat Dec 26, 2020 5:12 pm Post subject:

What version is virtualbox on windows? The problem can be the different version between host and guest?
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Moriah · Posted: Sat Dec 26, 2020 6:17 pm Post subject:

VirtualBox 6.1
GUI Version 6.1.16 r140961 (Qt5.6.2)
(C) 2020 Oracle Corp.
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fedeliallalinea · Posted: Sat Dec 26, 2020 6:32 pm Post subject:

Try to unmask app-emulation/virtualbox-guest-additions-6.1.16-r1
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Moriah · Posted: Mon Dec 28, 2020 3:02 am Post subject:

OK, I unmasked app-emulation/virtualbox-guest-additions-6.1.16-r1 and emerged it; I got:

fedeliallalinea · Posted: Mon Dec 28, 2020 6:55 am Post subject:

This one is interesting, you have also /lib/modules/5.4.80-gentoo-r1-x86_64/kernel/drivers/vboxguest/vboxguest.ko installed?
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Moriah · Posted: Mon Dec 28, 2020 1:13 pm Post subject:

No, in fact there is not even the directory /lib/modules/5.4.80-gentoo-r1-x86_64/kernel/drivers/vboxguest present.

There is, however, a /lib/modules/5.4.80-gentoo-r1-x86_64/kernel/drivers/virt/vboxguest/vboxguest.ko; did you typo the path?

fedeliallalinea · Posted: Mon Dec 28, 2020 1:16 pm Post subject:

Moriah · Posted: Mon Dec 28, 2020 5:21 pm Post subject:

Since this is a genkernel, can I just unload it somehow? It actually does not seem to be loaded.
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fedeliallalinea · Posted: Mon Dec 28, 2020 5:30 pm Post subject:

Moriah · Posted: Mon Dec 28, 2020 5:48 pm Post subject:

OK, anything else I should change while I'm in manuconfig?
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fedeliallalinea · Posted: Mon Dec 28, 2020 5:53 pm Post subject:

Hu · Administrator Joined: 06 Mar 2007 Posts: 22809

You may be too deep into this to want to change, but I felt I should point out that Qemu/KVM does not build its own kernel modules, and instead works fine with just what is shipped in the upstream kernel. If your goal is just to start a VM, and you either do not need to import an existing VirtualBox disk or you can find how to convert it, Qemu might be a simpler choice. Depending on how much state you have in VirtualBox, it's also possible Qemu is not a good choice at this point.

Moriah · Posted: Mon Dec 28, 2020 6:14 pm Post subject:

@Hu:
I chose virtualBox because I also need to import/export files with the underlying host w10 system, and due to the nature of those files, I do not want them going over the network. VirtualBox has shared directory capability that does not use nfs/samba/etc. but works entirely locally. I have used KVM before, but in this case, the laptop host machine is my client's, not mine, and they manage the w10 firewall and security settings, so I cannot easliy change them.

Besides, does KVM even host on w10? I thought it was linux only. Remember: I am hosting on w10 with a gentoo guest.
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Buffoon · Veteran Joined: 17 Jun 2015 Posts: 1369 Location: EU or US

I don't know what is wrong there, but if you get missing symbols error then it points to possible version mismatch between running kernel and modules.

The key to success:
Make sure you build your kernel and modules with same toolchain.
Make sure you build your modules against your running kernel sources.
Rebuild out of tree modules every time you change something in your kernel configuration, even if the version of kernel remains unchanged, just in case..

Moriah · Posted: Tue Dec 29, 2020 6:26 pm Post subject:

OK, so as long as I'm building kernel modules, I would prefer to get off of genkernel and back to the good old way. I've been building gentoo kernels since 2004, and almost never used genkernel. I only used it here because I didn't want to fiddle with kernel config when all I wanted was a vm to run gentoo on an otherwise w10 box. I originally chose gentoo because it would let me do crazy things (in those days) like boot from an unpartitioned fully encrypted hard drive, using lvm for everything, so I could use snapshots for freezing a view of the running filesystem during backup, while still letting the system keep running and doing its job. That is plain vanilla today, but was "way out there" back then; initreads were "roll your own with nash" back then. :mrgreen:

Is there an easy way to go from genkernel to a "real" kernel? Can I leverage the genkernel to make configuring the real kernel easier?

Or is there a "standard" kernel config for running an adm64 vm under w10? I mainly need the screen resize and the shared folder features to work. I already have everything else I need working under genkernel.
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Buffoon · Veteran Joined: 17 Jun 2015 Posts: 1369 Location: EU or US

Moriah,

I've never used genkernel, once I thought about trying it but then I decided learning how to use it is not worth the effort. Spending a little time with your own kernel is the price what you pay for having your own ... comes with rewards, though.

Hu · Administrator Joined: 06 Mar 2007 Posts: 22809