On Fri, May 11, 2012 at 05:58:01PM -0600, Alex Williamson wrote: > On Fri, 2012-05-11 at 16:38 -0700, Greg KH wrote: > > On Fri, May 11, 2012 at 04:55:35PM -0600, Alex Williamson wrote: > > > IOMMU groups allow IOMMU drivers to represent DMA visibility > > > and isolation of devices. Multiple devices may be grouped > > > together for the purposes of DMA. Placing a pointer on > > > struct device enable easy access for things like streaming > > > DMA programming and drivers like VFIO. > > > > > > Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > > > > Can't you get this today from the iommu_ops pointer that is on the bus > > that the device is associated with? Or can devices on a bus have > > different iommu_group pointers? > > The latter, each device on a bus might be it's own group. This is often > the case on x86 unless PCIe-to-PCI bridges obscure the device > visibility. Thanks, Ah, ok, then I have no objection to add this to struct device: Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
