QEMU warnings, LXC failurse for libvirt on Fedora 33 Silverblue

Project Discussion
1

Installed the @virtualization group by hand (via rpm-ostree install) on Fedora 33 Silverblue. After enabling libvirtd, the following output appears with virt-host-validate:

[adkaplan@localhost ~]$ virt-host-validate 
  QEMU: Checking for hardware virtualization                                 : PASS
  QEMU: Checking if device /dev/kvm exists                                   : PASS
  QEMU: Checking if device /dev/kvm is accessible                            : PASS
  QEMU: Checking if device /dev/vhost-net exists                             : PASS
  QEMU: Checking if device /dev/net/tun exists                               : PASS
  QEMU: Checking for cgroup 'cpu' controller support                         : WARN (Enable 'cpu' in kernel Kconfig file or mount/enable cgroup controller in your system)
  QEMU: Checking for cgroup 'cpuacct' controller support                     : PASS
  QEMU: Checking for cgroup 'cpuset' controller support                      : WARN (Enable 'cpuset' in kernel Kconfig file or mount/enable cgroup controller in your system)
  QEMU: Checking for cgroup 'memory' controller support                      : PASS
  QEMU: Checking for cgroup 'devices' controller support                     : WARN (Enable 'devices' in kernel Kconfig file or mount/enable cgroup controller in your system)
  QEMU: Checking for cgroup 'blkio' controller support                       : WARN (Enable 'blkio' in kernel Kconfig file or mount/enable cgroup controller in your system)
  QEMU: Checking for device assignment IOMMU support                         : PASS
  QEMU: Checking if IOMMU is enabled by kernel                               : WARN (IOMMU appears to be disabled in kernel. Add intel_iommu=on to kernel cmdline arguments)
  QEMU: Checking for secure guest support                                    : WARN (Unknown if this platform has Secure Guest support)
   LXC: Checking for Linux >= 2.6.26                                         : PASS
   LXC: Checking for namespace ipc                                           : PASS
   LXC: Checking for namespace mnt                                           : PASS
   LXC: Checking for namespace pid                                           : PASS
   LXC: Checking for namespace uts                                           : PASS
   LXC: Checking for namespace net                                           : PASS
   LXC: Checking for namespace user                                          : PASS
   LXC: Checking for cgroup 'cpu' controller support                         : FAIL (Enable 'cpu' in kernel Kconfig file or mount/enable cgroup controller in your system)
   LXC: Checking for cgroup 'cpuacct' controller support                     : PASS
   LXC: Checking for cgroup 'cpuset' controller support                      : FAIL (Enable 'cpuset' in kernel Kconfig file or mount/enable cgroup controller in your system)
   LXC: Checking for cgroup 'memory' controller support                      : PASS
   LXC: Checking for cgroup 'devices' controller support                     : FAIL (Enable 'devices' in kernel Kconfig file or mount/enable cgroup controller in your system)
   LXC: Checking for cgroup 'freezer' controller support                     : FAIL (Enable 'freezer' in kernel Kconfig file or mount/enable cgroup controller in your system)
   LXC: Checking for cgroup 'blkio' controller support                       : FAIL (Enable 'blkio' in kernel Kconfig file or mount/enable cgroup controller in your system)
   LXC: Checking if device /sys/fs/fuse/connections exists                   : PASS

Is this to be expected?

2

This has been reported and fixed upstream. It will most likely be in the next major libvirt release.

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