On Mon, Jan 20, 2020 at 04:44:34PM +0800, Jason Wang wrote: > > On 2020/1/19 下午5:59, Michael S. Tsirkin wrote: > > On Sun, Jan 19, 2020 at 09:07:09AM +0000, Shahaf Shuler wrote: > > > > Technically, we can keep the incremental API > > > > here and let the vendor vDPA drivers to record the full mapping > > > > internally which may slightly increase the complexity of vendor driver. > > > What will be the trigger for the driver to know it received the last mapping on this series and it can now push it to the on-chip IOMMU? > > Some kind of invalidate API? > > > > The problem is how to deal with the case of vIOMMU. When vIOMMU is enabling > there's no concept of last mapping. > > Thanks Most IOMMUs have a translation cache so have an invalidate API too. -- MST
