On Thu, Aug 25, 2011 at 11:38:09AM -0400, Don Dutile wrote: > On 08/25/2011 06:54 AM, Roedel, Joerg wrote: > > We need to solve this differently. ARM is starting to use the iommu-api > > too and this definitly does not work there. One possible solution might > > be to make the iommu-ops per-bus. > > > When you think of a system where there isn't just one bus-type > with iommu support, it makes more sense. > Additionally, it also allows the long-term architecture to use different types > of IOMMUs on each bus segment -- think per-PCIe-switch/bridge IOMMUs -- > esp. 'tuned' IOMMUs -- ones better geared for networks, ones better geared > for direct-attach disk hba's. Not sure how likely it is to have different types of IOMMUs within a given bus-type. But if they become reality we can multiplex in the iommu-api without much hassle :) For now, something like bus_set_iommu() or bus_register_iommu() would provide a nice way to do bus-specific setups for a given iommu implementation. Joerg -- AMD Operating System Research Center Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach General Managers: Alberto Bozzo, Andrew Bowd Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632 -- 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
