On Tue, Jan 13, 2009 at 01:39:13PM -0800, Chris Wright wrote: > * Dave Jones (davej@xxxxxxxxxx) wrote: > > 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. > > Upstream was still broken as recently as Friday for bad BIOSes (x200s in > this case). Wonder if opt-in via cmdline would be helpful? > A patch from Dirk Hohndel fixes this (looks like it got merged Sundayish, after floating around linux-pci for a week.) AFAIK, at least. regards, Kyle _______________________________________________ Fedora-kernel-list mailing list Fedora-kernel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-kernel-list
