Re: [Qemu-devel] [PATCH v2 1/6] qerror: add MAX_KEYCODES 16

[Gerd Hoffmann]

  Hi,

>> It seems we need to notice user when inputted keys are more than 16.
> 
> Hi Gerd,
> 
> When I use 'sendkey' command to send key-series to guest, some keyboard
> events will be send. There is a limitation (16) that was introduced by this
> old commit c8256f9d (without description). Do you know the reason?

Probably hardware limitation, ps/2 keyboards can buffer up to 16 keys IIRC.

Likewise the usb hid devices can buffer up to 16 events.  In that case
it is just a qemu implementation detail and not a property of the
hardware we are emulating, so it can be changed.  Not trivially though
as the buffer is part of the migration data, so it is more work that
just changing a #define.

HTH,
  Gerd