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

[Julien Grall <julien.grall@xxxxxxx>]

Hi Jan,

On 18/07/18 08:12, 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.
That what I had in mind. I agree that this solution would not scale to 
Dom10 and beyond. But that ring solution is not going to be any better.
Let's imagine you want to switch between domain 9 and 8. You would need 
to type CTRL-AAA N time before reaching the right console. N been the 
number of domain you have using the console.
It feels like, you want to provide a key for selecting the console (e.g 
'c') and then type the domain ID you want to access. Can you read 
another key when in the keyhandler?
Cheers,

--
Julien Grall

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