Re: Experimental results for VGA passthrough

["Beng Heng, Ng" <bengheng@eecs.umich.edu>]

Hi,

With the patch applied, I did a FLR on the card as follows:
echo -n "0000:00:02.0" > /sys/bus/pci/drivers/pciback/do_flr

The screen turned blank upon issuing the command. I was able to boot up
DomU. Shutting down DomU returns the screen to blank. Is this the
expected observation?

Thanks.

- Beng Heng

Jean Guyader wrote:
> We have a patch to the FLR support to pciback.
> http://xenbits.xen.org/gitweb?p=xenclient/linux-2.6.27-pq.git;a=blob_plain;f=master/pciback-flr;hb=HEAD
> 
> Jean
> 
> 2009/6/6 Beng Heng, Ng <bengheng@eecs.umich.edu>:
>> Apologies, I missed your earlier point about the FLR. I'll try that out.
>> Thanks.
>>
>> - Beng Heng
>>
>> Beng Heng, Ng wrote:
>>> Hi Jean,
>>>
>>> For the linux guest, I tested using Ubuntu 64-bit. It doesn't seem to
>>> work well, and hangs shortly after boot-up. I've attached a short clip
>>> and hopefully that can explain my observations better. I've also
>>> attached logs from the serial terminal and Qemu. I'd like to bring your
>>> attention to the last lines of the Qemu log, which warns that the guest
>>> is trying to write to unused BAR.
>>>
>>> On the other hand, things are much smoother with Vista 64-bit. I have
>>> tried no less than three times, and all went smoothly. Even the
>>> resolution, color and Aero feature are equivalent to native. The only
>>> minor issue is that after shutdown, the screen becomes blank. But I
>>> suppose this is better than XP which was "stuck" in the shutdown screen.
>>> I have the logs and clip for Vista as well. As the clip is bigger, I'll
>>> only send it to you if you want.
>>>
>>> Please let me know if there's any comments or suggestions which you'd
>>> like me to try out. Thanks and have a great weekend.
>>>
>>> Warmest Regards,
>>> Beng Heng
>>>
>>> Jean Guyader wrote:
>>>> Could you tell me if it works with a Vista guest or a linux hvm guest?
>>>>
>>>> The page fault and the screen still stays on Windows issue are due to
>>>> the lack of FLR in your kernel. Doing a FLR on the graphic card before
>>>> booting and when the domain shutdown will fix those.
>>>>
>>>> Thanks,
>>>> Jean
>>>>
>>
> 
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