Re: [PATCH for 6.1 1/2] ui/gtk: add a keyboard fifo to the VTE consoles

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sun, Jul 18, 2021 at 02:00:03PM +0100, Peter Maydell wrote:
> On Sun, 18 Jul 2021 at 08:50, Volker Rümelin <vr_qemu@t-online.de> wrote:
> >
> > Since commit 8eb13bbbac ("ui/gtk: vte: fix sending multiple
> > characeters") it's very easy to lock up QEMU with the gtk ui.
> > If you configure a guest with a serial device and the guest
> > doesn't listen on this device, QEMU will lock up after
> > entering two characters in the serial console.
> >
> > To fix this problem copy the function kbd_send_chars() and
> > related code from ui/console.c to ui/gtk.c. kbd_send_chars()
> > doesn't lock up because it uses a timer instead of a busy loop
> > for the write retries.
> >
> > Fixes: 8eb13bbbac ("ui/gtk: vte: fix sending multiple characeters")
> > Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
> > ---
> >  include/ui/gtk.h |  5 +++++
> >  ui/gtk.c         | 53 ++++++++++++++++++++++++++++++++++++++++--------
> >  2 files changed, 50 insertions(+), 8 deletions(-)
> 
> This feels like maybe it's the kind of thing that should be handled
> more generically rather than in one particular UI frontend ?

IIUC none of the other frontends directly talk to the chardevs for the
serial ports. Instead they communicate via the text console interfaces.
So GTK is a bit special already here.


Regards,
Daniel
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