config changes

[Dave Jones]

On Tue, Jan 13, 2009 at 09:55:27PM +0100, Gerd Hoffmann wrote:
 > Bill Nottingham wrote:
 > > Here's some proposed config changes.
 > 
 > Jumping on the wagon ;)
 > 
 > Can we enable CONFIG_DMAR please?  This turns on the IOMMU on intel
 > boxes, using VT-d.  Called "DMA Remapping" in intel speak, this is where
 > the config option name comes from.  Advantages:
 > 
 >   (1) 32bit PCI devices can DMA to memory above 4G, thus the need for
 >       swiotlb (i.e. bounce buffers) is gone.
 >   (2) It allows kvm to pass through PCI devices to guests securely.
 
The last time we tried this, it blew up a lot due to broken BIOSes.
Maybe it's been improved enough to tolerate them, so we can probably
give it a spin in rawhide for a while to see what happens.

	Dave

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