On 17 December 2016 at 11:10, Ed Jaffe <[email protected]> wrote: > Yeah. This code was written back in the 1980s before EPSW (which is a GREAT > instruction BTW that came out only about 30 years too late) was even a > glimmer in some hardware developers eye. ;)
It couldn't exist before SIE, because it breaks the pre-SIE VM. A problem program must not be (architecturally, not by heuristics) able to discover that it's running in a virtual machine. To boot, the PSW would be wrong most of the time. But thinking on it, XA was over 30 years ago. Was SIE in the first XA? I'm pretty sure EPSW didn't come along until ESA/370. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
