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Re: [Xen-devel] Re: [PATCH][VTD][v2] enable calpella/sandybridge integr

To: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH][VTD][v2] enable calpella/sandybridge integreated graphics passthrough
From: Jean Guyader <jean.guyader@xxxxxxxxx>
Date: Thu, 10 Jun 2010 16:29:59 +0100
Cc: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Jean Guyader <Jean.Guyader@xxxxxxxxxx>, Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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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.


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