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Re: [Qemu-devel] [PATCH for 2.10] ps2: fix sending of PAUSE/BREAK scanco

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH for 2.10] ps2: fix sending of PAUSE/BREAK scancodes
Date: Wed, 26 Jul 2017 12:28:26 +0100
User-agent: Mutt/1.8.3 (2017-05-23)

On Tue, Jul 25, 2017 at 01:53:40PM +0200, Gerd Hoffmann wrote:
>   Hi,
> > > You're putting some specific code for spice in ps2 emulation.
> > > IMO, the workaround should be moved to spice keyboard handling
> > > (ui/spice-input.c),
> > > which needs to generate a qcode instead of a scancode.
> > 
> > This isn't really a spice specific hack. QEMU internal code is *not*
> > required
> > to use qcodes 
> qcodes are prefered in new code though.
> > - the KeyValue struct is a union that allows use of either qcodes
> > or XT scancodes, and the latter is what all the frontends (SPICE,
> > VNC, GTk, SDL)
> > use. QCodes are really only input by the monitor (the sendkey
> > command).
> Well, PAUSE is actually sent as qcode by sdl and gtk.  This avoids
> special cases in the input layer (PAUSE is the only three scancodes key
> sequence).  IMO spice should do the same.  I want switch UIs to qcodes
> anyway.

qcodes as currently defined cover only a subset of the AT set1 scancodes,
so we need to define countless more qcodes before we consider converting
UIs to use qcodes.

Aside from the pause/break bug, the changes to ps2 driver to round trip
via qcodes have now made it impossible to send a large number of key
sequences to the guest OS :-( Admittedly the missing key codes are not
so commonly used, but it is still a notable regression in functionality

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