Re: [Xen-devel] [XenARM] probably FAQ: latest xen PV api/abi specs

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-11-05 at 20:11 +0100, Goswin von Brederlow wrote:
> On Tue, Nov 05, 2013 at 09:48:39AM +0000, Ian Campbell wrote:
> > On Tue, 2013-11-05 at 10:20 +0100, Goswin von Brederlow wrote:
> > > Hi,
> > > 
> > > this might be an FAQ but I'm looking for the documentation for the xen
> > > guest API/ABI exposed to domU kernels on arm.
> > 
> > Which port are you asking about?
> > http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions or
> > http://wiki.xen.org/wiki/Xen_ARM_%28PV%29 ? I only know about the former
> > and it sounds like this is the one you mean?
> > 
> > Adding xen-devel which is the right venue for virt extensions questions,
> > xen-arm@ is for the PV port.
> 
> I'm interested in older arm cpus like the RaspberryPI, which doesn't
> have the virtualization extension. Therefore I'm interested in the PV
> port.

OK. I think the statement you've seen regarding API/ABI stability all
refer to the hardware based port. That said I know nothing about the
stated (or otherwise) stability of the API/ABI of the PV port.

Its developers have not been active for several years now. I'm afraid I
think you'd be wasting your time pursuing it on the RPi.

> Or would it be feasable and make more sense to emulate the HVC
> instruction in the undefined handler? Probably not given the extensive
> use of hardware facilities.

I'm sure it could be done at a technical level, but it would effectively
be an entirely new port...

Ian.


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