I've installed a fresh copy of ubuntu 20.04 ; I have upgraded it to 20.10 ;
I have installed all the relevant packages for xen,libvirt and kvm and boom
: it worked.

Il giorno mer 28 ott 2020 alle ore 10:50 Stefan Bader <
<email address hidden>> ha scritto:

> On 27.10.20 15:36, Christian Ehrhardt wrote:
> > @smb do you see anything like this in 20.10?
> >
> I can not remember for sure. I believe I had some guest up via libvirt. But
> probably not with the final kernel.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1901398
>
> Title:
>   Unable to configure libxl's memory management parameters
>
> Status in libvirt package in Ubuntu:
>   New
>
> Bug description:
>   Hello.
>
>   Yesterday I've upgraded ubuntu 20.04 to 20.10 and I have soon realized
>   that libvirt stopped working with xen. Xen itself works ok for me,as u
>   can see :
>
>   root@ziomario-z390aoruspro:/etc/xen# xl list
>   Name                                        ID   Mem VCPUs State Time(s)
>   Domain-0                                     0 32065    16     r-----
>  435.8
>
>   but it does not with libvirt :
>
>   root@ziomario-z390aoruspro:/etc/xen# virsh pool-list --all
>   error: failed to connect to the hypervisor
>   error: Failed to connect socket to '/var/run/libvirt/libvirt-sock':
> Connection denied
>
>   this is what happens when I query for the status :
>
>   root@ziomario-z390aoruspro:/etc/xen# sudo systemctl status
> libvirtd.service
>   ● libvirtd.service - Virtualization daemon
>        Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled;
> vendor preset: enabled)
>        Active: inactive (dead) since Sun 2020-10-25 12:11:43 CET; 41s ago
>   TriggeredBy: ● libvirtd.socket
>                ● libvirtd-ro.socket
>                ● libvirtd-admin.socket
>          Docs: man:libvirtd(8)
>                https://libvirt.org
>       Process: 4283 ExecStart=/usr/sbin/libvirtd $libvirtd_opts
> (code=exited, status=0/SUCCESS)
>      Main PID: 4283 (code=exited, status=0/SUCCESS)
>         Tasks: 2 (limit: 32768)
>        Memory: 28.2M
>        CGroup: /system.slice/libvirtd.service
>                ├─1577 /usr/sbin/dnsmasq
> --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
> --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
>                └─1578 /usr/sbin/dnsmasq
> --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
> --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
>
>   ott 25 12:11:43 ziomario-z390aoruspro dnsmasq[1577]: read
> /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
>   ott 25 12:11:43 ziomario-z390aoruspro dnsmasq-dhcp[1577]: read
> /var/lib/libvirt/dnsmasq/default.hostsfile
>   ott 25 12:11:43 ziomario-z390aoruspro libvirtd[4283]: libvirt version:
> 6.6.0, package: 1ubuntu3 (Christian Ehrhardt <
> <email address hidden>> Thu, 08 Oct 2020 07:3>
>   ott 25 12:11:43 ziomario-z390aoruspro libvirtd[4283]: hostname:
> ziomario-z390aoruspro
>   ott 25 12:11:43 ziomario-z390aoruspro libvirtd[4283]: Unable to
> configure libxl's memory management parameters
>   ott 25 12:11:43 ziomario-z390aoruspro libvirtd[4283]: Initialization of
> Xen state driver failed: no error
>   ott 25 12:11:43 ziomario-z390aoruspro libvirtd[4283]: Driver state
> initialization failed
>   ott 25 12:11:43 ziomario-z390aoruspro systemd[1]: libvirtd.service:
> Succeeded.
>   ott 25 12:11:43 ziomario-z390aoruspro systemd[1]: libvirtd.service: Unit
> process 1577 (dnsmasq) remains running after unit stopped.
>   ott 25 12:11:43 ziomario-z390aoruspro systemd[1]: libvirtd.service: Unit
> process 1578 (dnsmasq) remains running after unit stopped.
>
>
>   if xen works without libvirt AND it does not work with Libvirt,it is a
> bug of libvirt. I dind't see this behavior with ubuntu 20.04 ; so it is a
> bug of ubuntu 20.10. do u want to give a look ?
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1901398/+subscriptions
>


-- 
Mario.