On 06.03.22 06:32, Jarkko Sakkinen wrote: > For device memory (aka VM_IO | VM_PFNMAP) MAP_POPULATE does nothing. Allow > to use that for initializing the device memory by providing a new callback > f_ops->populate() for the purpose. > > SGX patches are provided to show the callback in context. > > An obvious alternative is a ioctl but it is less elegant and requires > two syscalls (mmap + ioctl) per memory range, instead of just one > (mmap). What about extending MADV_POPULATE_READ | MADV_POPULATE_WRITE to support VM_IO | VM_PFNMAP (as well?) ? -- Thanks, David / dhildenb
