[Spice-devel] Questions about multimonitor Xinerama configuration

[Leonardo E. Reiter]

On Fri, Jun 24, 2011 at 11:46 AM, Leonardo E. Reiter
<lreiter at vbridges.com>wrote:

> On Fri, Jun 24, 2011 at 4:33 AM, Gerd Hoffmann <kraxel at redhat.com> wrote:
>
>>  Hi,
>>
>>
>>  you can see the 2nd QXL device at 00:06.0.  I don't know why the first
>>> one says "VGA compatible" and the second one doesn't, but hopefully that
>>> is not an issue.
>>>
>>
>> The second simply isn't matched by the qxl driver due to the different PCI
>> class.  Fixable (see attachent).
>>
> Thanks... I will try this and keep testing... we are looking into the
> spicec crash as well, because this was happening for us even with Windows
> guests.  But any more help with the this QXL issue will be much appreciated.
>
Definitely confirmed the situation you explained... I had to remove the
"Screen" config from the Device sections from the /etc/X11/xorg.conf, at
which point I was able to start with 2 SPICE windows but blank.  This is
after applying your patch (using the 0.13.0 tag in git for the QXL driver).
 gdb'ing Xorg and getting a backtrace shows:

#0  qxl_ring_push (ring=0xe6c490, new_elt=0x7ffff4578850) at qxl_ring.c:73
#1  0x00007f5fa413ecd0 in push_surface_cmd (surface=0xed8c60)
    at qxl_surface.c:435
#2  send_destroy (surface=0xed8c60) at qxl_surface.c:766
#3  0x00007f5fa413ce38 in qxl_destroy_pixmap (pixmap=0x1657670)
    at qxl_driver.c:739
#4  0x00000000004cc19c in ?? ()
#5  0x00000000004ab0da in ?? ()
#6  0x00000000004bb998 in FreePicture ()
#7  0x0000000000455840 in FreeResource ()
#8  0x00000000004c2f3a in ?? ()
#9  0x00000000004c014d in ?? ()
#10 0x00000000004275dc in ?? ()
#11 0x000000000042208a in _start ()

I'll keep investigating but would appreciate any further help.

Thanks,
Leo Reiter


>
>>
>> That alone doesn't get things going though, guess thats why it isn't
>> supported (yet?) by the driver.  I can get X to show the display on one or
>> the other qxl device, but not with xinerama on both.
>>
>> Seems to be stuck here:
>>
>> 0x00007f3f90620992 in qxl_ring_push (ring=0x126e4c0,
>> new_elt=0x7fff74a3afa0) at qxl_ring.c:73
>> 73          while (header->prod - header->cons == header->num_items)
>> (gdb) bt
>> #0  0x00007f3f90620992 in qxl_ring_push (ring=0x126e4c0,
>> new_elt=0x7fff74a3afa0) at qxl_ring.c:73
>> #1  0x00007f3f9061ee5b in push_drawable (drawable=<optimized out>,
>> qxl=<optimized out>)
>>    at qxl_surface.c:516
>> #2  push_drawable (qxl=<optimized out>, drawable=<optimized out>) at
>> qxl_surface.c:498
>> #3  0x00007f3f906208d1 in qxl_surface_put_image (dest=0x12f5ce0,
>> x=<optimized out>,
>>    y=<optimized out>, width=24, height=24, src=0x2058468 "", src_pitch=96)
>> at qxl_surface.c:1465
>> #4  0x00007f3f9062618d in uxa_do_put_image (src_stride=96, bits=0x2058468
>> "", format=2, h=24,
>>    w=24, y=<optimized out>, x=<optimized out>, depth=<optimized out>,
>> pGC=0x1a2fe00,
>>    pDrawable=0x1a35910) at uxa-accel.c:329
>> #5  uxa_put_image (pDrawable=0x1a35910, pGC=0x1a2fe00, depth=<optimized
>> out>, x=<optimized out>,
>>    y=0, w=24, h=24, leftPad=0, format=2, bits=0x2058468 "") at
>> uxa-accel.c:367
>> #6  0x00000000004dc199 in ?? ()
>> #7  0x000000000042b91d in ?? ()
>> #8  0x000000000042ec11 in ?? ()
>> #9  0x0000000000422e1a in ?? ()
>> #10 0x00000033c1a2139d in __libc_start_main () from /lib64/libc.so.6
>> #11 0x0000000000423101 in _start ()
>>
>> Could be a server side issue too (guest driver spinning, waiting for
>> spice-server to take requests out of the ring).  Also note that spicec
>> crashed while the X-Server tried to init the two qxl devices in xinerama
>> mode ...
>>
>> cheers,
>>  Gerd
>>
>
> Thanks,
>
> - Leo Reiter
>
>
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