Re: [Xen-devel] Experimental results for VGA passthrough

[Jean Guyader <jean.guyader@xxxxxxxxx>]

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

2009/6/5 Beng Heng, Ng <bengheng@xxxxxxxxxxxxxx>:
> Ok, I've gotten that patch in. If I pass through Intel IGD now, I'm able
> to boot DomU with it. However, it is not particularly stable, meaning
> sometimes it just takes too long to start DomU (I waited about 2
> minutes). I think it may have something to do with the pagefault. I've
> attached the log for a normal case.
>
> One problem remains though. After shutting down from within DomU, the
> screen still stays at the Windows Shutdown screen.
>
> Also, the resolution and color is probably in EGA. Is this because some
> of the registers are still emulated?
>
> Thanks.
>
> - Beng Heng
>
> So that solves
> Jean Guyader wrote:
>> If you want the intel to work as a primary display adapter you need to
>> do all those thing:
>>   - Disable the vga in qemu
>>   - Copy the VGA bios in the guest
>>   - Map the legacy io port and MMIOs
>>   - Fake some value in the host bridge.
>>
>> You can have a look at this patch.
>> http://xenbits.xen.org/gitweb?p=xenclient/ioemu-pq.git;a=blob;f=master/vga-passthrough;h=d2adba9f84a17df59b1bedc843d29433b4f1eff0;hb=HEAD
>>
>> I will try to push it xen upstream when i'll have some times.
>>
>> Jean
>>
>
>

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