I attempted an upgrade of a XEN guest from OES2015sp1 to OES2018 soon after it's release, which unfortunately failed leaving the guest unable to boot
'failed to find kernel' , 'dmi firmware registration failed unable to boot the server' errors.

Support eventually stated that I was running into a new bug (https://bugzilla.novell.com/show_bug.cgi?id=1060183)
that should be fixed by Citrix in the near future -
status was said to be "Waiting for response from Citrix. This can deferred to patches. This will be fixed once Citrix support sles 12 sp2"
I didn't have the authority to view the bug details...

Just wondering if this has been resolved now and I can restart the OES2018 upgrade roll-out to our XEN Guests...?