Re: [Xen-devel] [PATCH] linux-2.6.18/xencons: generalize use of add_preferred_console()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.02.14 at 09:32, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Fri, Feb 07, Jan Beulich wrote:
> 
>> They question is what the intended behavior here is: I'd generally
> 
> In my opinion dom0 is just a child of Xen, which should follow the rules
> of the parent. If Xen is configured to have its console on serial then
> the default of dom0 should be to follow just that. Appearently its just
> a matter of correctly using xvc0.
> 
> I'm not sure what the gain would be to have Xen on serial and dom0
> somewhere else, and enforcing the need of a console= cmdline option to
> point dom0 also to serial. Thats just doing things twice.

That's a fair point, but leaves aside the case of Xen _not_ using
the serial console. Dom0 has no way to know, and hence would
still push output there, not knowing that it ends up no-where.

Also the "follow the rules of the parent" already doesn't apply for
the VGA console case, where Dom0 makes its own decision too
(and it's for that reason that Xen needs to stop sending data to
the VGA in order to not interfere). Hence I'm not sure that
argument really counts.

Jan


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