KVM not available on system bus

[Kasper Laudrup]

Hi libvirt-users,

Hope this is the right place to ask, otherwise please point me in the 
right direction.

I have a libvirt virtual machine running on the session bus that I would 
like to access through SSH. I have previously done so using X11 
forwarding and while it works, it is very sluggish with the connection I 
have.

I recently learned that you can access the virtual machine with 
virt-viewer through SSH which should perform much better. Unfortunately, 
my virtual machine is currently running on the session bus and that 
doesn't seem to be supported (please do correct if I'm wrong here).

It doesn't really matter to much if the VM is running on the system bus 
or session bus, I just prefer running things as a non privileged user 
for all the obvious reasons, so that's where I created the VM initially.

I tried to follow this guide to move my VM to the system bus.

Running `sudo virsh define vm.xml` fails with:

error: invalid argument: could not find capabilities for arch=x86_64 
domaintype=kvm

Digging a bit further into it, I figured out that the cause of the error 
message is, that I for some reason do not have KVM acceleration support 
when running VMs on the system bus (as root) running my VM on the 
session bus as a normal user (with the correct group membership) works fine.

Trying to launch virt-manager as root verifies that, as creating a new 
VM warns me that I do not have KVM support.

I'm fairly lost as to what to do from here. I must admit I remember 
struggling a bit to get the virtual machine to run with KVM support on 
the session bus in the first place, but have completely forgotten what 
the problem and resolution was.

I'm using Debian stable (Buster) with standard package versions:

QEMU 3.1.0
libvirt 5.0.0

Any kind of help or input would be greatly appreciated.

Thanks a lot and kind regards,

Kasper Laudrup