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Description of problem:
In xen/hyperv mode, configure filter_host_parents or exclude_host_parents in /etc/virt-who.d/xxx.config, virt-who hasn't shown any remind info in the log.

Version-Release number of selected component (if applicable):
virt-who-0.21.0-1.el7.noarch
subscription-manager-1.20.5-1.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Register system to satellite6.2.12
2. Configure virt-who run at xen/hyperv mode with filter_host_parents or exclude_host_parents in /etc/virt-who.d/xxx.config
[root@xen-RHEL-7 virt-who.d]# cat xen.conf 
[xen]
type=xen
server=10.73.131.203
username=root
password=Welcome1
owner=Default_Organization
env=Library
filter_host_parents=host_parents
3. Restart virt-who and check virt-who's log in /var/log/rhsm/rhsm.log

Actual results:
Although it send h/g mapping info normally, it hasn't show remind info "filter_host_parents is not supported in xen mode, ignoring it"

Expected results:
Since filter_host_parents/exclude_host_parents is not supported on hyperv/xen mode, it should show remind info "filter_host_parents/exclude_host_parents is not supported in xen/hyperv mode, ignoring it" in rhsm.log

Additional info:
It hasn't this problem on virt-who-0.20.4-1.el7sat.noarch

Verify it on virt-who-0.21.1-1.el7.noarch, when filter_host_parents exist on /etc/virt-who.d/xxx.conf, it's correct to show remind info "Ignoring unknown configuration option "filter_host_parents". Therefore, verify it.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0895