Re: [Qemu-devel] [Fwd: Re: i8042 buffer size?]

[Tomasz Chmielewski <mangoo@wpkg.org>]

Marcelo Tosatti wrote:

>>> 18 ff 00 18 ff 00 18 ff 00 18 fe 00 18 ff 00 18 ff 00 18 fe 00 18 ff 00 
>>> 18 ff 00 18 ff 00 18 ff 00 18 ff 00 18 ff 00 08 00 01 18 ff 00 18 ff 00 
>>> 18 ff 01 18 ff 00 08 00 01 18 ff 00 18 fe 02 18 ff 00 18 ff 00 18 ff 01 
>>> 18 fd 00 18 fd 00 18 fa 00 18 f7 00 18 f7 00 18 f4 00 18 f3 00 18 ef 00 
>>> 18 ee 01 18 ed 03 18 ec 04 18 e9 02 08 7f 08 08 7f 00 08 44 00 09 00 00 
>>> 19 fc 01 08 00 00 38 81 ff 18 92 00 
>> This looks seriously like uninitialized memory (12-bit FAT perhaps?) -
>> and very much like a Qemu bug. It doesn't even make sense if interpreted
>> as keyboard scancodes - 00 is reserved and ff is an error condition.
> 
> Tomasz, 
> 
> Can you provide a recipe on how to reproduce this?

I used it with KVM, but it doesn't look KVM specific. I'll see if it 
happens with "pure" Qemu.

To reproduce:

- start a guest; connect to VNC
- type on the keyboard (just tap as much keys as you can) as you see 
BIOS, bootloader, Linux booting
- if it didn't work on the first time, reboot the guest, type on the 
keyboard, change windows with your mouse etc. (make the VNC window 
"always on top" usually helps to have focus)

I can reproduce it almost always.


-- 
Tomasz Chmielewski
http://wpkg.org