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Date: Wed, 25 Jun 2014 12:14:16 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: peter.maydell@linaro.org, xen-devel@lists.xensource.com, stefano.stabellini@eu.citrix.com, allen.m.kay@intel.com, Kelly.Zytaruk@amd.com, qemu-devel@nongnu.org, anthony.perard@citrix.com, anthony@codemonkey.ws, yang.z.zhang@intel.com, "Chen, Tiejun" <tiejun.chen@intel.com>

Il 25/06/2014 12:09, Michael S. Tsirkin ha scritto:
>> > It's not just a couple of IDs, it's also random fields of the MCH
>> > configuration space.  Grep drivers/gpu/drm/i915 for bridge_dev.
>> >
>> > Paolo
> I did, it seems to look for device at 0,0:
>
> 	static int i915_get_bridge_dev(struct drm_device *dev)
> 	{
> 		struct drm_i915_private *dev_priv = dev->dev_private;
>
> 		dev_priv->bridge_dev = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
> 		if (!dev_priv->bridge_dev) {
> 			DRM_ERROR("bridge device not found\n");
> 			return -1;
> 		}
> 		return 0;
> 	}
>
> are you sure this is the ISA bridge device? these patches put it at 1f.
>

For the PCH it's just the ids, but there are also accesses to the MCH 
config space.

Paolo