Re: [Qemu-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough support

[Paolo Bonzini]

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