[TUHS] UNIX on S/370

[Larry McVoy]

On Mon, Nov 20, 2017 at 04:56:27PM -0600, Michael Parson wrote:
> 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.

Sorry, we were running Linux/370 on Hercules simulator:

http://www.hercules-390.org/

which I _thought_ emulated the bare metal.