Folks,
I've been a VMware user for a long time. However after having
various issues running vmware under F43 I decided this was an
opportune time to learn about KVM. So I ran:
[pgaltieri@terrapin ~]$ virt-host-validate
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 secure guest support : WARN (Unknown if this
platform has Secure Guest support)
.
.
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)
I've googled the issue and I get different responses. The one I used is
GRUB_CMDLINE_LINUX="rhgb quiet intel_iommu=on cgroup_enable=devices
systemd.unified_cgroup_hierarchy=0"
in /etc/default/grub
even after doing the
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
and rebooting I still get the FAIL for cgroup devices and freezer.
I even tried with systemd.unified_cgroup_hierarchy=1 with the same
result. What do I need to do to resolve these failures?
Any help is appreciated.
Paolo
Hi Paolo,
I found an article in google that indicates that the cgroup warning
can be ignored because it doesn't apply to kvm, it is only relevant to
LXC, and that virt-host-validate is checking for cgroup V1 support but
Fedora is apparently using cgroup V2.
Also I found an article that says that on F40 adding intel_iommu=on
systemd.unified_cgroup_hierarchy=0 to GRUB_CMDLINE_LINUX in
/etc/sysconfig/grub resolved the fail issues.
The same article also has a response from someone else indicating
that systemd.unified_cgroup_hierarchy=0 should not be used as it is
forcing the use of cgroups1 which has been deprecated. He also says
after using that parameter podman warned that the system was using
cgroup1, but the message disappeared by removing that parameter. He is
also specifying that the freezer fail is irrelevant for cgroup2 as
cgroup_freezer should be disabled as specified at
https://cateee.net/lkddb/web-lkddb/CGROUP_FREEZER.html.
He also says that the other parameter is relative to hypervisor
performance and for Intel CPU's (VT-d and VT-x) you need iommu=pt
intel_iommu=on but for AMD CPU's (VT-Vi) you only need iommu=pt and
IOMMU is enabled by default and documented in
https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/configuring_and_managing_virtualization/.
The url for the article I found is
https://discussion.fedoraproject.org/t/how-to-enable-devices-and-freezer-in-kconfig-file/118077/2.
regards,
BEGIN:VCARD
VERSION:4.0
N:Morris;Stephen;;;
FN:Stephen Morris
EMAIL;PREF=1;TYPE=home:[email protected]
END:VCARD
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