Re: [Qemu-devel] Strange monitor/stdout issue on qemu-system-sparc/qemu-system-ppc

[Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>]

On 31/01/16 21:57, Paolo Bonzini wrote:

> On 31/01/2016 18:54, Peter Maydell wrote:
>> On 31 January 2016 at 17:19, Paolo Bonzini <pbonzini@redhat.com> wrote:
>>> On 31/01/2016 16:54, Mark Cave-Ayland wrote:
>>>> I also notice that with the above commit I lose cycling through history
>>>> in the GTK monitor - even with the multiple echo, instead of the up/down
>>>> arrow keys cycling through the history instead I see the codes ^[[B and
>>>> ^[[A being output to the window instead.
>>>
>>> That is probably me.  The echo feature was introduced for QMP, but in
>>> theory it should have been limited to that.  I'll check it, thanks.
>>
>> I've also seen echo, but only intermittently...
> 
> That smells like uninitialized memory or something like that.
> 
> Actually I'm fairly sure I tested "-monitor vc" at least, so perhaps
> it's an interaction between the echo feature and "qemu-char: add logfile
> facility to all chardev backends".  Anyway I'll look at it.

Yeah I think you're right. I did a little bit of testing yesterday and
the echo disappeared until I remembered that I'd been testing a
self-built OpenBIOS - and as soon as I reintroduced this option onto the
command line, the echo magically re-appeared.

I can reproduce this consistently under qemu-system-ppc git master like
this:

make distclean
STRIP= './configure' '--target-list=ppc-softmmu'
'--prefix=/home/build/rel-qemu-git' '--enable-gtk' '--disable-pie'

and then specifying a -bios parameter on the command line (even if it is
the same file as that normally used by QEMU):

$ ./qemu-system-ppc -bios ../share/qemu/openbios-ppc

Now try typing into the GTK monitor window and hopefully you should be
able to see the problem.


ATB,

Mark.