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:	Mon, 07 Jul 2014 16:57:45 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Chen, Tiejun" <tiejun.chen@...el.com>,
	jani.nikula@...ux.intel.com, airlied@...ux.ie,
	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 07/07/2014 16:49, Daniel Vetter ha scritto:
> So the correct fix to forward intel gpus to guests is indeed to somehow
> fake the pch pci ids since the driver really needs them. Gross design, but
> that's how the hardware works.

A way that could work for virtualization is this: if you find the card 
has a magic subsystem vendor id, fetch the subsystem device id and use 
_that_ as the PCH device id.

Would that work for you?

Paolo
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