Re: [Xen-devel] [PATCH 9/9] xenstore: when running in mini-os use printk for diagnostic messages

[Juergen Gross <jgross@xxxxxxxx>]

On 15/12/15 13:31, Ian Campbell wrote:
> On Fri, 2015-12-11 at 16:47 +0100, Juergen Gross wrote:
>> Xenstore messages for diagnostic purposes are lost today in case
>> xenstore is running under mini-os instead in a dom0 daemon.
> 
> Where does vfprintf end up under mini-os?

TBH: I just couldn't find it. I tried to get some diagnostics when
I started this work and couldn't find any place where the messages
would occur.

>> Use printk of mini-os in this situation.
> 
> and this now ends up on the console and (for a debug h/v) in the xen dmesg,
> is that right?

The console of the xenstore domain seems to be a little bit special, as
there is no component up to now writing the information needed to
connect xenconsoled to the xenstore domain. This could be the reason I
wasn't able to see any message printed via vfprintf. :-(

So in the end it will be part of xen dmesg. And this is where it should
be, as such messages will be needed in case of xenstore domain not
working properly. And I think it's console can be accessed by any means
only in case of a working xenstore. :-)


Juergen


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