On Wed, Jun 29, 2011 at 02:02:02PM +0900, KyongHo Cho wrote: > Hi. > > On Fri, Jun 24, 2011 at 12:31 AM, Joerg Roedel <joerg.roedel@xxxxxxx> wrote: > > It needs to be called whenever a some code changed a domain (either by > > attaching/detaching devices or by mapping/unmapping pages in > > the domain). > > Do you mean we can invalidate IOTLB with this iommu_commit()? > We need to invalidate IOTLB without updating page table for some > optimized solutions. > > If a device in one domain is moved to other domain, IOTLB of the > device must be invalidated > because it contains translation information of the previous domain. The classic use-case is to do a single iommu-tlb flush after a set of page-table updates, but flushing iotlbs after moving devices is a potential use-case too, so the answer is yes. Regards, Joerg -- 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
