Re: [Xen-devel] [PATCH RFC 0/5] Split off mini-os to a separate tree

[Martin Lucina <martin@xxxxxxxxxx>]

anil@xxxxxxxxxx said:
> On 26 Jan 2015, at 17:42, Martin Lucina <martin@xxxxxxxxxx> wrote:
> > 
> > talex5@xxxxxxxxx said:
> >> In case it's useful: for the standalone version of Mini-OS used by
> >> Mirage, I had to include these directories too:
> >> 
> >> 1. xen/include/public
> >> 2. xen/common/libfdt
> >> 3. xen/include/xen/libfdt
> >> 4. config
> >> 
> >> ( https://github.com/talex5/xen/tree/minios-releases )
> > 
> > Ah, so that's where the Mirage fork of Mini-OS lives. I knew there was one,
> > but not where. Any other forks please speak up :-)
> > 
> > Which parts of Mini-OS does Mirage actually use? I know you have an OCaml
> > implementation of netfront, for instance.
> 
> Not very much of Mini-OS -- Mirage has everything from the ring protocol
> up (XenStore, NetBack/Front, BlkBack/Front, Console, etc are all in OCaml).
> So event channels and start of day boot, mainly.
> 
> It is useful to have the C XenBus around for start-of-day logging though,
> since the emergency console isn't much use on public cloud services.

Interesting. Rump Kernels on Xen currently use the Mini-OS xenbus,
{net,blk,pci}front and console, however AFAICT most (all?) of these could
be provided by the NetBSD drivers instead. Such a setup also would not
leave much from Mini-OS.

I'm wondering if there is interest in a Nano-OS that provides just the bare
minimum needed for Unikernels to run atop cloud hypervisors (hint hint)?

Martin

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