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

To: "Han, Weidong" <weidong.han@xxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 1/2] graphics passthrough with VT-d
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Sat, 19 Sep 2009 02:15:13 +0100
Cc: "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "Lin, Ben Y" <ben.y.lin@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Jean Guyader <Jean.Guyader@xxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>, 'Jean Guyader' <jean.guyader@xxxxxxxxx>, "'bengheng@xxxxxxxxxxxxxx'" <bengheng@xxxxxxxxxxxxxx>
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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.

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