From mboxrd@z Thu Jan 1 00:00:00 1970 From: mparson@bl.org (Michael Parson) Date: Mon, 20 Nov 2017 16:56:27 -0600 (CST) Subject: [TUHS] UNIX on S/370 In-Reply-To: <20171120192910.GG9146@mcvoy.com> References: <20171120160504.3C46B18C091@mercury.lcs.mit.edu> <201711201927.vAKJRPqj006781@freefriends.org> <20171120192910.GG9146@mcvoy.com> Message-ID: On Mon, 20 Nov 2017, Larry McVoy wrote: > On Mon, Nov 20, 2017 at 12:27:25PM -0700, arnold at skeeve.com wrote: >> Any idea what Linux/370 does? I think it runs on bare iron. > > Pretty sure that's correct, we used to run Linux/370 on simulator to > build BitKeeper images for it. I don't remember any VM stuff. When I was at IBM, I had a few customers running the product I supported under Linux on z, and what wikipedia says matches my memory of it being able to run either on metal or as a VM: Linux runs on standard, general purpose mainframe CPs (Central Processors) as well as IFLs (Integrated Facility for Linux). IFLs are mainframe processors dedicated to running Linux, either natively or under a hypervisor (z/VM or KVM on z). Microcode restricts IFLs from running "traditional" workloads, such as z/OS, but they are physically identical to other z System processors. IFLs are typically less expensive to acquire from IBM than CPs. -- Michael Parson Pflugerville, TX KF5LGQ