[Intel-gfx] [PATCH] x86/Sandy Bridge: reserve pages when integrated graphics is present

[Alan Cox]

On Wed, 14 Nov 2012 20:43:31 +0000
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> SNB graphics devices have a bug that prevent them from accessing certain
> memory ranges, namely anything below 1M and in the pages listed in the
> table.  So reserve those at boot if set detect a SNB gfx device on the
> CPU to avoid GPU hangs.

What happens if the other addresses map to an external memory object - eg
a PCI device which is a legitimate DMA source for video overlay etc ?

I assume this is just for GPU fetches from main memory ?

Alan