Since a few months I have Debian 9 (“Stretch”) running on my notebook. Yesterday I wanted to install a virtual machine with Windows 7 running on it for testing some applications. So I tried to install VirtualBox through the Debian repository but I had to find out, that VirtualBox no longer is contained in the repository. So I tried to make it run by installing the .deb package provided on oracles website, but I did not make it. Because of this I decided to check out KVM. This is a virtualisation software being contained in the linux kernel and some forum entries on google claim it is as fast as VirtualBox, but on my system it took some configuration before I was able to successfully start a VM on with it.
First of all, you need to check if your System has the Intel-VT or AMD-V instruction set, because KVM will not be able to run without it. According to stackoverflow.com, this can be done the following way:
# sudo apt-get install msr-tools # sudo modprobe msr # sudo rdmsr 0x3a
If the result of this call is 3 or 5, the instruction set is supported. Now install the client software:
# sudo apt-get install qemu-kvm
You also should add a GUI for more comfortable configuration:
# sudo apt-get install virt-manager
When you now try to start the VM, you maybe will get following message:
failed to initialize: permission denied
As stated out on issue #1095, You solve this by restarting the KVM kernel modules:
# sudo rmmod kvm_intel # sudo rmmod kvm # sudo modprobe kvm # sudo modprobe kvm_intel
Now you can create a new virtual machine and starting it using virt-manager.