From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#22633: Provide a kvm-less qemu / guix system vm
Date: Sun, 21 Feb 2016 13:06:51 +0100
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To: Christopher Allan Webber <cwebber@dustycloud.org>
Cc: 22633@debbugs.gnu.org

Christopher Allan Webber <cwebber@dustycloud.org> skribis:

> I tried this:
>
>   (operating-system
>     (kernel linux-libre-4.1)
>     (kernel-arguments '("modprobe.blacklist=3Dkvm-intel,kvm"))
>     ...)
>
> The generated Grub configuration looks right:
>
>   menuentry "GNU with Linux-Libre 4.1.17 (alpha)" {
>     search --label --set guix
>     linux /gnu/store/k3l4g22vypwniy0k3f8xha9l8p1s716d-linux-libre-4.1.17/=
bzImage --root=3Dguix --system=3D/gnu/store/flq2702dmj6ppqc4iix6xgp0q364yl3=
l-system --load=3D/gnu/store/flq2702dmj6ppqc4iix6xgp0q364yl3l-system/boot m=
odprobe.blacklist=3Dkvm-intel,kvm
>     initrd /gnu/store/flq2702dmj6ppqc4iix6xgp0q364yl3l-system/initrd
>   }
>
> Unfortunately, after rebooting into it:
>
>   cwebber@oolong:~$ lsmod | grep kvm
>   kvm_intel             155648  0
>   kvm                   491520  1 kvm_intel
>   cwebber@oolong:~$ ls /dev/kvm
>   /dev/kvm
>
> Not sure why it didn't seem to do anything...

Libkmod honors =E2=80=98modprobe.blacklist=E2=80=99 (in =E2=80=98kcmdline_p=
arse_result=E2=80=99 in
libkmod-config.c) and eudev passes KMOD_PROBE_APPLY_BLACKLIST
unconditionally in udev-builtin-kmod.c (meaning it honors it too.)

However, there=E2=80=99s a hyphen-vs-underscore issue, I think.  Namely, the
file is called =E2=80=98kvm-intel.ko=E2=80=99, but the normalized module na=
me is
=E2=80=98kvm_intel=E2=80=99, and this is what libkmod expects (commit 5c7dd=
5a changes
our code to normalize module names similarly.)

Could you try with =E2=80=9Cmodprobe.blacklist=3Dkvm_intel=E2=80=9D?

TIA,
Ludo=E2=80=99.