On Tue, Jan 21, 2020 at 03:15:43AM -0500, Michael S. Tsirkin wrote: > > This sounds more flexible e.g driver may choose to implement static mapping > > one through commit. But a question here, it looks to me this still requires > > the DMA to be synced with at least commit here. Otherwise device may get DMA > > fault? Or device is expected to be paused DMA during begin? > > > > Thanks > > For example, commit might switch one set of tables for another, > without need to pause DMA. I'm not aware of any hardware that can do something like this completely atomically.. Any mapping change API has to be based around add/remove regions without any active DMA (ie active DMA is a guest error the guest can be crashed if it does this) Jason
