Comment 5 for bug 1506582

There is config from my local server:

(devops-venv-2.9.9)root@srv09-kha:/etc/modprobe.d# ls -la /etc/modprobe.d/
total 44
drwxr-xr-x 2 root root 4096 Sep 9 01:04 .
drwxr-xr-x 108 root root 4096 Sep 9 13:16 ..
-rw-r--r-- 1 root root 325 Apr 10 2014 blacklist-ath_pci.conf
-rw-r--r-- 1 root root 1603 Apr 10 2014 blacklist.conf
-rw-r--r-- 1 root root 210 Apr 10 2014 blacklist-firewire.conf
-rw-r--r-- 1 root root 677 Apr 10 2014 blacklist-framebuffer.conf
-rw-r--r-- 1 root root 583 Apr 10 2014 blacklist-rare-network.conf
-rw-r--r-- 1 root root 1077 Apr 10 2014 blacklist-watchdog.conf
-rw-r--r-- 1 root root 456 Apr 14 2014 fbdev-blacklist.conf
-rw-r--r-- 1 root root 347 Apr 10 2014 iwlwifi.conf
-rw-r--r-- 1 root root 104 Apr 10 2014 mlx4.conf

(devops-venv-2.9.9)root@srv09-kha:/etc/modprobe.d# cat /etc/issue
Ubuntu 14.04.3 LTS \n \l

(devops-venv-2.9.9)root@srv09-kha:/etc/modprobe.d# qemu-system-x86_64 --version
QEMU emulator version 2.4.0 (Debian 1:2.4+dfsg-ubuntu2), Copyright (c) 2003-2008 Fabrice Bellard

(devops-venv-2.9.9)root@srv09-kha:/etc/modprobe.d# cat /sys/module/kvm_intel/parameters/nested
Y

There is no file /etc/modprobe.d/qemu-system-x86.conf , but 'nested' is enabled for module 'kvm_intel'.

There were installed, in the following order:
- qemu 2.0.0 from upstream Ubuntu repo;
- qemu 2.0.0 from devops repo;
- qemu 2.4 from devops repo