Bug 1845717

Description of problem:
The tuned realtime-virtual-host profile doesn't complete the configuration as per script.sh when kernel-rt-kvm is missing or kvm module is not loaded.

Version-Release number of selected component (if applicable):
tuned-2.13.0-6.el8.noarch

How reproducible:
Every time

Steps to Reproduce:
1. Setup an RT host without kernel-rt-kvm package
2. Apply tuned realtime-virtual-host profile & reboot
3. Verify the error in tuned.log and by manually executing:

- cat /sys/kernel/ktimer_lockless_check
- systemctl status rt-entsk

Actual results:
[root@virtlab500 ~]# cat /proc/cmdline 
BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-193.7.1.rt13.58.el8_2.x86_64 root=/dev/mapper/rhel_virtlab500-root ro crashkernel=auto resume=/dev/mapper/rhel_virtlab500-swap rd.lvm.lv=rhel_virtlab500/root rd.lvm.lv=rhel_virtlab500/swap console=ttyS1,115200 skew_tick=1 isolcpus=managed_irq,domain,1,3,5,7,9,11,13,15 intel_pstate=disable nosoftlockup tsc=nowatchdog nohz=on nohz_full=1,3,5,7,9,11,13,15 rcu_nocbs=1,3,5,7,9,11,13,15
[root@virtlab500 ~]# rpm -qa tuned
tuned-2.13.0-6.el8.noarch
[root@virtlab500 ~]# tuned-adm active
Current active profile: realtime-virtual-host
[root@virtlab500 ~]# 
[root@virtlab500 ~]# cat /sys/kernel/ktimer_lockless_check
0
[root@virtlab500 ~]# systemctl status rt-entsk
● rt-entsk.service - RT Enable Netsocket Timestap Static Key daemon
   Loaded: loaded (/usr/lib/systemd/system/rt-entsk.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

Expected results:
I think that the realtime-virtual-host profile should enable rt-entsk and set ktimer_lockless_check even if kernel-rt-kvm is missing or kvm module is not loaded. This is because realtime-virtual host consist of tuning that could impact not just guest latency but RT host latency as well.

Additional info:
2020-06-09 16:36:40,275 INFO     tuned.plugins.plugin_cpu: energy_perf_bias successfully set to 'performance' on cpu 'cpu6'
2020-06-09 16:36:40,275 INFO     tuned.plugins.plugin_cpu: setting new cpu latency 3
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'net.core.busy_read', the parameter does not exist
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: sysctl option net.core.busy_read will not be set, failed to read the original value.
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'net.core.busy_poll', the parameter does not exist
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: sysctl option net.core.busy_poll will not be set, failed to read the original value.
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: Failed to read sysctl parameter 'kernel.numa_balancing', the parameter does not exist
2020-06-09 16:36:40,277 ERROR    tuned.plugins.plugin_sysctl: sysctl option kernel.numa_balancing will not be set, failed to read the original value.
2020-06-09 16:36:40,279 INFO     tuned.plugins.plugin_sysctl: reapplying system sysctl
2020-06-09 16:36:40,280 WARNING  tuned.plugins.plugin_vm: Option 'transparent_hugepages' is not supported on current hardware.
2020-06-09 16:36:40,281 INFO     tuned.plugins.plugin_bootloader: installing additional boot command line parameters to grub2
2020-06-09 16:36:40,415 INFO     tuned.plugins.plugin_script: calling script '/usr/lib/tuned/realtime/script.sh' with arguments '['start']'
2020-06-09 16:36:40,467 INFO     tuned.plugins.plugin_script: calling script '/usr/lib/tuned/realtime-virtual-host/script.sh' with arguments '['start']'
2020-06-09 16:36:40,520 ERROR    tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime-virtual-host/script.sh' error output: 'modinfo: ERROR: Module kvm not found.
modinfo: ERROR: Module kvm_intel not found.
/sys/module/kvm/parameters/lapic_timer_advance_ns not found'
2020-06-09 16:36:40,520 ERROR    tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime-virtual-host/script.sh' returned error code: 1
2020-06-09 16:36:40,706 INFO     tuned.daemon.daemon: static tuning from profile 'realtime-virtual-host' applied