linux-kernel - Re: [RFC][PATCH] gpu:drm:i915:intel_detect_pch: back to check devfn instead of check class type

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Date:	Fri, 20 Jun 2014 14:48:42 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Tiejun Chen <tiejun.chen@...el.com>, daniel.vetter@...ll.ch,
	jani.nikula@...ux.intel.com, airlied@...ux.ie
CC:	intel-gfx@...ts.freedesktop.org, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	qemu-devel@...gnu.org
Subject: Re: [RFC][PATCH] gpu:drm:i915:intel_detect_pch: back to check devfn
 instead of check class type

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
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