Re: [Xen-devel] Re: [PATCH][VTD][v2] enable calpella/sandybridge integreated graphics passthrough

[Jean Guyader <jean.guyader@xxxxxxxxx>]

On 9 June 2010 17:16, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Kay, Allen M writes ("[PATCH][VTD][v2] enable calpella/sandybridge 
> integreated graphics passthrough"):
>> This QEMU patch enables calpella and sandybridge integrated graphics 
>> passthrough.
>>
>> Changes  in version 2: Incorporated feedbacks from Stephano and Isaku.
>
> Thanks.  I'm sure this is fine (or at least, I will be when someone
> acks it) but it really could do with some explanation of why it's
> right - in terms of the code changes, rather than just "makes some
> particular chip work".
>

The intel gpu driver for this platform has more expectation on the
hardware so we have to expose more thing to the guest:
   - opregion: It's a NVS storage and the driver use it to communicate
between the bios and the driver, so we have to map it.
   - pci-to-pci bridge: The driver check if such device is there, so
we have to expose it.

Actually those are changes to please the driver more than the chip itself.

Jean

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