Re: Xen article for the FreeBSD Journal

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Nov 15, 2024 at 06:40:01PM +0000, Ayan Kumar Halder wrote:
> Hi Roger,
> 
> On 15/11/2024 12:23, Roger Pau Monné wrote:
> <snip>
> > I've added the following bullet point ahead of the
> > dom0less/hyperlaunch one:
> > 
> >   * Deterministic interrupt latency: significant efforts have been put into 
> > Xen
> >     to ensure interrupt latency remains both low and deterministic, even in 
> > the
> >     presence of cache pressure caused by noisy neighbors.  There's a patch
> >     series currently in review that adds cache coloring support to Xen.
> 
> An additional point worth mentioning (in the context of real time) is that
> Xen is being ported on Arm-v8R MPU (memory protection unit) based system.
> This is quite significant change in Xen's architecture as it has always been
> supported on MMU based systems. With MPU, there is flat mapping between VA
> and PA and thus, one can achieve real time effect as there is no translation
> involved. There is a limited number of memory protection regions that can be
> created by Xen to ensure memory type and access restrictions on different
> regions.

Thanks, I've added this into the above bullet point.

Regards, Roger.