Re: [Xen-devel] [v2][PATCH 6/8] xen, gfx passthrough: support Intel IGD passthrough with VT-D

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Friday, May 16, 2014 10:35 PM
> To: Chen, Tiejun
> Cc: anthony.perard@xxxxxxxxxx; stefano.stabellini@xxxxxxxxxxxxx;
> mst@xxxxxxxxxx; Kelly.Zytaruk@xxxxxxx; peter.maydell@xxxxxxxxxx;
> xen-devel@xxxxxxxxxxxxxxxxxxx; weidong.han@xxxxxxxxx; Kay, Allen M;
> qemu-devel@xxxxxxxxxx; jean.guyader@xxxxxxxxxxxxx;
> anthony@xxxxxxxxxxxxx; Zhang, Yang Z
> Subject: Re: [Xen-devel] [v2][PATCH 6/8] xen, gfx passthrough: support Intel
> IGD passthrough with VT-D
> 
> On Fri, May 16, 2014 at 06:53:42PM +0800, Tiejun Chen wrote:
> > Some registers of Intel IGD are mapped in host bridge, so it needs to
> > passthrough these registers of physical host bridge to guest because
> > emulated host bridge in guest doesn't have these mappings.
> 
> When you say mapped - you mean they are aliased - so if I change the value in
> the IGD they will change in the host bridge as well, right?
> 

Loos Yang already address some most points, so I just correct others based on 
your comments.

Thanks
Tiejun

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