Hello, I don't know what version of AIX you are using but I found an article
on IBM's website talking about openSSH and AIX. Sounds like you may have to install it yourself.
What do you mean by 'can't run on mainframe in virtual environment'?
Do you mean AIX can't run in a virtual machine on a mainframe or that AIX can't be a 'host' for virtual machine's to run under?
I would be hard pressed to believe AIX doesn't support virtual machines on mainframes since IBM pioneered virtualization by including it in their mainframes 20+ years ago!
However, I am no expert so I could be wrong. I will ask my Dad tomorrow (he's AIX expert) and get back to you.