The patchset supports Intel IGD passthrough in Xen. There are some 
assumptions/dependencies on chipset, VBIOS, and even drivers for IGD. But 
virtual platform is not aware of it. This patchset handles it to make IGD work 
in guest. What's more, FLR capability of IGD is not exposed on some platforms, 
this patchset uses vendor specific FLR to reset those IGDs.
Also add an option into hvm config file to enable graphics passthrough.
The patchset was tested in Intel McCreary platform, guest WinXP, Win7 and Linux 
all worked. 
Patch 1: qemu-igd.patch:
 Some registers of Intel IGD are mapped in host bridge, so it needs to 
passthrough these registers of physical host bridge to guest because emulated 
host bridge in guest doesn't have these mappings. 
 Some VBIOSs and drivers assume the IGD BDF (bus:device:function) is 
always 00:02.0, so this patch reserves 00:02.0 for assigned IGD in guest.
Patch 2: igd-flr.patch:
 Due to FLR capability of IGD is not exposed on some platforms, this 
patch uses vendor specific FLR to reset those IGDs.
Patch 3: gfx-conf.patch:
 The patch adds an option into hvm config file to enable graphics 
passthrough including discrete and IGD. To passthrough graphics to guest, need 
to set gfx_passthru=1, and also specify graphics device BDF in pci passthrough 
option, like pci=['xx:xx.x'] in hvm config file.
Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
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