On 3/3/22 13:23, Reinette Chatre wrote: > Unfortunately MAP_POPULATE is not supported by SGX VMAs because of their > VM_IO and VM_PFNMAP flags. When VMAs with such flags obtain this capability > then I believe that SGX would benefit. Some Intel folks asked for this quite a while ago. I think it's entirely doable: add a new vm_ops->populate() function that will allow ignoring VM_IO|VM_PFNMAP if present. Or, if nobody wants to waste all of the vm_ops space, just add an arch_vma_populate() or something which can call over into SGX. I'll happily review the patches if anyone can put such a beast together.
