RE: [XenARM] VMM for smart devices

[ROSSIER Daniel <Daniel.Rossier@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-arm-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-arm-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Shailesh Kumar
> Sent: dimanche, 8. mars 2009 18:28
> To: Fasiha Ashraf
> Cc: xen-arm@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [XenARM] VMM for smart devices
> 
> How different is the hyperviser port than Adeos one?

The main difference resides in the way isolation is achieved. Adeos mainly 
focus on IRQ abstraction (IRQ is captured and
dispatched according to the domain priorities, but it is still possible for a 
non-RT domain (Linux one for instance) to issue
syscalls and put locks on the CPU, therefore monopolize the CPU as long as it 
wants. We experienced some important differences in jitter when the user 
interacts with a touchscreen LCD for example. Of course, the Adeos approach 
reduces
the overhead and decrease the latency time despite the security (isolation) 
issues. On the other hand, we do not have any experience so far in what kind of 
overhead an hypervisor like XEN may introduce: that is one of our main 
objectives to realize this port.

> Please also share if there is any porting guidelines available. I am
> familiar with the ADEOS based Xenomai porting but hyperviser based
> Xenomai.... I am wondering. Please share any documents related to this
> activity.

Of course, we will inform as soon as we start with the Xenomai integration on 
top of the hypervisor. It would be great if you could also help us in this 
port. Right now, we are still preparing a bootable hypervisor (it should be 
available by end of next week on embeddedXEN sourceforge). We keep you informed.

> 
> Regards
> Sailesh.
> On Fri, Mar 6, 2009 at 5:44 PM, Fasiha Ashraf <feehapk@xxxxxxxxxxx>
> wrote:
> 
> 
> Is there Xen or any other hypervisor available freely for handheld
> devices like iPhones? i mean as open source code.
> 
> Regards!
> 
> Fasiha Ashraf
> 

Daniel


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