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Re: [Xen-devel] Send A Fake PS/2 Packet to QEMU and Mouse Pointer on PV

To: Felix Kuperjans <felix@xxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Send A Fake PS/2 Packet to QEMU and Mouse Pointer on PV OS
From: "涂堂訓(Tang-Hsun Tu)" <iwantplay@xxxxxxxxx>
Date: Tue, 21 Sep 2010 11:27:20 +0800
Delivery-date: Mon, 20 Sep 2010 20:30:19 -0700
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       Thanks for your reply, the audio patch works.
I can play audio between DomUs.

於 2010/9/20 下午 09:20, Felix Kuperjans 提到:
 I can only answer your third question:

You can switch to using ALSA with qemu (no idea why this is *not* the
default), e.g. by recompiling xen-tools with the attached patch. In KVM,
a QEMU_AUDIO_DRV="alsa" environment variable works, too. No idea whether
XEN accepts it or not.

Another way with further control would be to use PulseAudio in the Dom0
and in the DomUs (I think there is even a windows port), which is able
to send the audio data over network connections, so you won't need any
virtual sound cards. I have no setup/tutorial at hand, but it should be
easy to find on the internet.


Am 20.09.2010 13:19, schrieb "涂堂訓(Tang-Hsun Tu)":
 Dear all:

      I am trying to send a fake event to input layer of QEMU,
i.e. keyboard and mouse.

      QEMU provides two API to send these input event,
that is, kbd_put_keycode() and kbd_mouse_event() for keyboard and
mouse, respectively.
And these functions will make a suitable packet for low-level
hardware, e.g. PS/2 or USB.

      For a PS/2 mouse, there is a call chain  ps2_mouse_event() =>
ps2_mouse_send_packet() => ps2_queue()
when the function kbd_mouse_event() is called.
However, when I make a fake PS/2 mouse packet and directly call
to put the packet to PS/2 queue.
I store the PS2MouseState "s" when 8042 initializes and call
ps2_queue() to send a event,
for example,
          ps2_queue(&s->common, 0x1001);
          ps2_queue(&s->common, 0);
          ps2_queue(&s->common, 0);

And I also insert some debug  message in ps2_read_data() function,
it works well and reads data from queue correctly..
But the mouse pointer does not move (even right/left click).
I also set the default mouse to "Mouse $0: QEMU PS/2 Mouse" in QEMU
but the result is the same. What else I forgot to signal? How could I
fix it?

       The second question is when I create a PV Linux (Ubuntu),
the mouse pointer does not move correctly.
The screen (VNC) shows a black point and a mouse pointer,
and their speed does not the same.
In HVM XP, we can use usbdevice='tablet' to fix it,
but the same line does not work in PV Linux. How could I fix it?

      The last question is that does the sound can be shared (mixed)
between multiple DomainUs?
(The device will be busy when I create a domain.) If can, how could I do?


Best Regards,
Tang-Hsun Tu

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