On 01/02/2018 14:21, Eduardo Habkost wrote: >> The device looks at its own private page tables, and not >> to the OS ones. > I'm still confused by your statement that the device builds its > own [IOVA->PA] page table. How would the device do that if it > doesn't have access to the CPU MMU state? Isn't the IOVA->PA > translation table built by the OS?
The driver builds a page table for the device, either when it pins the pages or by using MMU notifiers. Paolo
