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Subject: Re: [Qemu-devel] [v6][PATCH 07/10] xen,
 gfx passthrough: register a isa bridge
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To: "Michael S. Tsirkin" <mst@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>
Cc: allen.m.kay@intel.com, qemu-devel@nongnu.org, aliguori@amazon.com, yang.z.zhang@intel.com, pbonzini@redhat.com, rth@twiddle.net

On 2015/1/19 21:58, Michael S. Tsirkin wrote:
> On Mon, Jan 19, 2015 at 12:57:18PM +0100, Gerd Hoffmann wrote:
>> On Mo, 2015-01-19 at 17:28 +0800, Tiejun Chen wrote:
>>> Currently IGD drivers always need to access PCH by 1f.0. But we
>>
>> Obvious question: q35?
>>
>> q35 already has a isa bridge @ 0x1f.0.  Guess that needs to be extended
>> for the pass-through then (simliar to the host bridge) instead of adding
>> a dummy bridge.
>>
>> Also: again xen naming here.
>>
>> cheers,
>>    Gerd
>
> This hack probably doesn't have a chance to work well for q35
> due to the above conflict.

Yeah, and I remember as we discussed previously, something else also 
conflict with Xen and Windows currently so Xen doesn't intend to go Q35.

Thanks
Tiejun

> Happily future cards won't need it.
>