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

[George Dunlap <george.dunlap@xxxxxxxxxx>]

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.

 -George



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