On Friday, 03/29/2002 at 10:27 CST, "Dennis G. Wicks" <[EMAIL PROTECTED]> wrote: > Greetings; > > I guess you mean it is a privileged instruction in linux/390 because it > isn't in VM. This leads to the strange situation where you need to be a > privileged linux user to issue general user CP commands.
The same is true for any guest operating system. Multi-user systems need supervisor/problem state to maintain the security and integrity of the operating system and, hence, other users. E.g. on z/OS and VSE, only authorized programs can talk to CP because it requires supervisor state. We were kind of spoiled by CMS, which, as a single-user system, runs everything in supervisor state with no worries. Regards, Alan Altmark Sr. Software Engineer IBM z/VM Development
