RE: [Xen-devel] [PATCH 1/2] graphics passthrough with VT-d

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Stefano Stabellini wrote:
> On Fri, 18 Sep 2009, Han, Weidong wrote:
>> Stefano Stabellini wrote:
>>> On Wed, 16 Sep 2009, Han, Weidong wrote:
>>>> I heard VT-d didn't work with stubdom, it needs some efforts to
>>>> support it. Actually I didn't try stubdom with VT-d.
>>>> 
>>> 
>>> You are right, currently stubdom doesn't work with passthrough.
>>> I have a patch series to make it work but it is not finished yet
>>> and I have been pulled on other projects; I hope to resume my work
>>> on that in the near future. 
>>> 
>>> In any case the fact the currently passthrough doesn't work with
>>> stubdom is not a good reason for introducing even more problematic
>>> changes.
>> 
>> There are many changes on qemu for gfx passthrough, copying and
>> mapping vbios in qemu just a small part. If other changes on qemu
>> can be implemented correspondingly in stubdom, why not copying and
>> mapping vbios in qemu?   
>> 
> 
> Because it would require the stubdom to be able to read the vgabios
> and it would be better if we avoid it.

The problem of changing on xc_hvm_build is need to modify hypercall API 
(xc_hvm_build_target_mem), it's better to avoid it. If it is more intrusive or 
harder to read vgabios in stubdom, we can change it back to modify xc_hvm_build.

Regards,
Weidong
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