This can be achieved by creating 2 OS definitions in osinfo RHEL <=6.8 with cpu.unsupported.value of all supported CPUs (power8,power9?) in clusters 4.2+ RHEL 6.9+ without the blacklist
Verified with: Software version:4.2.0-0.0.master.20171027213842.gitded437c.el7.centos Steps: Create cluster PPC with cpu type power 9 Add VM and check OS list. Results: see attached screenshot PASS
Created attachment 1346451 [details] OS list
This bugzilla is included in oVirt 4.2.0 release, published on Dec 20th 2017. Since the problem described in this bug report should be resolved in oVirt 4.2.0 release, published on Dec 20th 2017, it has been closed with a resolution of CURRENT RELEASE. If the solution does not work for you, please open a new bug report.