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RE: [Xen-devel] [PATCH][VTD] enable integrated graphics passthrough for

To: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH][VTD] enable integrated graphics passthrough for Calpella and Sandybridge
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Thu, 10 Jun 2010 14:21:54 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, Guyader <Jean.Guyader@xxxxxxxxxx>, Isaku Yamahata <yamahata@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, Ross Philipson <Ross.Philipson@xxxxxxxxxx>, Jean
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On Tue, 8 Jun 2010, Kay, Allen M wrote:
> Doing this resulted in a lot of duplicated code and also force code path to 
> change
> even when IGD passthrough is not used.  To do it correctly, I also need to
> put in IGD or PASSTHROGH awareness in piix_pci.c.  For now, I'm going to keep
> the original patch.

Can you register a dummy device at the address corresponding to IGD and
get the pci conf read and write calls directly from the functions you
pass to pci_register_device?

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