[Intel-gfx] [RFC][PATCH] gpu:drm:i915:intel_detect_pch: back to check devfn instead of check class type

[Paolo Bonzini]

Il 19/06/2014 11:53, Tiejun Chen ha scritto:
> so this mean that isa bridge is still represented with Dev31:Func0
> like the native OS. Furthermore, currently we're pushing VGA
> passthrough support into qemu upstream, and with some discussion,
> we wouldn't set the bridge class type and just expose this devfn.

Even this is not really optimal.  It just happens to work just because 
QEMU's machine is currently a PCI machine with the ISA bridge on 00:01.0.

As soon as you'll try doing integrated graphics passthrough on a PCIe 
machine type (such as QEMU's "-M q35") things will break down just as badly.

Paolo