Github user sateesh-chodapuneedi commented on the pull request:
https://github.com/apache/cloudstack/pull/815#issuecomment-212842765
>>Currently UI does not allow migration between different versions, and
changing UI for this change is not elegant.
@priyankparihar
Why allow this only from API? If hypervisor allows migration from lower
version to higher version, then let the API that is supposed to find target
hosts for migration pick all such hosts. Per hypervisor documentation (both
XenServer & VMware) migration is allowed from lower to higher versions. In such
case we should let the API `[findHostsForMigration
API](https://cloudstack.apache.org/api/apidocs-4.2/root_admin/findHostsForMigration.html)`
list hosts with higher versions compared to source host.
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