On Thu, Mar 07, 2019 at 02:17:20PM -0500, Jerome Glisse wrote: > > It's because of all these issues that I preferred just accessing > > userspace memory and handling faults. Unfortunately there does not > > appear to exist an API that whitelists a specific driver along the lines > > of "I checked this code for speculative info leaks, don't add barriers > > on data path please". > > Maybe it would be better to explore adding such helper then remapping > page into kernel address space ? I explored it a bit (see e.g. thread around: "__get_user slower than get_user") and I can tell you it's not trivial given the issue is around security. So in practice it does not seem fair to keep a significant optimization out of kernel because *maybe* we can do it differently even better :) -- MST
