Sorry, I missed this. On Thu, Mar 03, 2022 at 01:44:14PM -0800, Dave Hansen wrote: > 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. I'm sorry what I don't understand what you mean by ignoring here, i.e. cannot fully comprehend the last sentece. And would the vm_ops->populate() be called right after the existing ones involved with the VMA creation process? > 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. I'll start with vm_ops->populate() and check the feedback first for that. BR, Jarkko
