On Thu, Oct 01, 2015 at 12:43:53PM +0300, Avi Kivity wrote: > >There were some tentative to get it for other (older) drivers, named > >'bifurcated drivers', but it is stalled. > > IIRC they still exposed the ring to userspace.
How much would a ring write syscall cost? 1-2 microseconds, isn't it? Measureable, but it's not the end of the world. ring read might be safe to allow. Should buy us enough time until hypervisors support IOMMU. -- MST
