Re: [Xen-devel] [PATCH v2 20/21] xen: support console_switching between Dom0 and DomUs on ARM

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 18 Jul 2018, Jan Beulich wrote:
> >>> On 17.07.18 at 22:29, <julien.grall@xxxxxxx> wrote:
> > On 07/07/2018 00:12, Stefano Stabellini wrote:
> >> Today Ctrl-AAA is used to switch between Xen and Dom0. Extend the
> >> mechanism to allow for switching between Xen, Dom0, and any of the
> >> initial DomU created from Xen alongside Dom0 out of information provided
> >> via device tree.
> > It feels a bit painful for the user to switch N times to get his domain 
> > console. Would it be possible to provide a new key binding where you 
> > type the domain ID you want to switch to?
> 
> Does that mean you'd want to use 0-9 for this purpose? I'd be
> very hesitant to accept such, as we're pretty tight with available
> characters already. And of course 0-9 wouldn't scale to Dom10
> and beyond. If you have something else in mind, I think it would
> help if you spelled this out.

Let me premise that I think this is not important and the solution will
be fine even only with the existing Ctrl-AAA switching mechanism. In
fact, I would add that any usability improvements should NOT be part of
this series. I think we have more important things to add now before we
get to the console switching mechanism.

Let me also premise that the number of guests I imagine will be booted
using dom0less today is actually very limited. I doubt more than 4
guests. So it would be tolerable to rotate between them using Ctrl-AAA.


That said, I think that Julien's suggestion has merits. The fact that
it can only handle up to 10 guests is not an issue, because the number
of dom0less guests is lower than that in current scenarios. A similar
idea would be to introduce an Emacs-like binding such as:

  Ctrl-A + (domid number)

to switch to a given domid. But again, I would leave it for later
developments.

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