On 1/25/20 8:04 PM, Kasper Laudrup wrote: > 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). Virt-viewer accepts -c URI argument. In your case you can do: virt-viewer -c qemu:///session $domain and it will show the domain's GUI. > > 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. Domains running under the system connection doesn't necessarily run as root:root. You can configure the UID:GID pair in /etc/libvirt/qemu.conf (search user/group). Alternatively, each domain can be fine tuned to run under different user. See https://libvirt.org/formatdomain.html#seclabel for more info. > > 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 > > First of all, you need to verify that the host is KVM capable. Try running "virt-host-validate qemu" under root. It should do some basic diagnostic and suggest resolution to possible errors. Secondly, you want to make sure that /dev/kvm is accessible to the user that you want to start your domain under. I'm using consolekit on my desktop so whenever I log in it appends an ACL entry to the file so that my user can run domains: # getfacl /dev/kvm getfacl: Removing leading '/' from absolute path names # file: dev/kvm # owner: root # group: kvm user::rw- user:zippy:rw- group::rw- mask::rw- other::--- After these steps, libvirt should detect KVM just fine. Michal
