Re: [Xen-devel] [ARM] Native application design and discussion (I hope)

[Julien Grall <julien.grall@xxxxxxx>]

On 05/08/2017 07:31 PM, Stefano Stabellini wrote:
> On Mon, 8 May 2017, George Dunlap wrote:
> > On 05/05/17 20:28, Stefano Stabellini wrote:
> > > On Fri, 5 May 2017, Andrii Anisov wrote:
> > > > Hello Stefano,
> > > >
> > > > On 24.04.17 21:08, Stefano Stabellini wrote:
> > > > > Stubdomains (stubdoms in short) are small domains, each running a single
> > > > > application. Typically they run unikernels rather than a full fledged
> > > > > operating system. A classic example is QEMU stubdoms on x86: one QEMU
> > > > > stubdoms is started for each regular guest domain. Each QEMU stubdom
> > > > > instance provides emulation for one guest - it runs one instance of
> > > > > QEMU.
> > > > I'm wondering if there are any examples of practical usage of stub domains
> > > > with ARM?
> > > Good question. I don't think so: there have been practical examples of
> > > unikernels running on Xen on ARM, but not stubdoms, because we haven't
> > > needed to run large emulation pieces yet.
> > So often when we say "stub domains" we mean specifically, "devicemodel
> > stub domains".  But there are many other stub domains for other
> > purposes.  You can run xenstored in a stubdomain rather than in dom0,
> > for instance; I think this probably already works on ARM.  I believe
> > that the PV vTPM architecture also has one vTPM "worker" per guest,
> > along with a "global" domain to control the physical TPM and multiplex
> > it over the various vTPMs.
> TPM is an x86 concept, but xenstored stubdom is possible.
>
> Althought they don't have to, stubdoms are typically based on mini-os
> (git://xenbits.xen.org/mini-os.git) which only has 32-bit ARM support
> today. However, it should be possible to run a 32-bit stubdom on a
> 64-bit host.
The 32-bit ARM support in Mini-OS has never been completed. Hopefully
someone will finish it soon.

Cheers,

--
Julien Grall

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