Messages in this thread | | | Date | Sat, 5 Mar 2022 05:19:24 +0200 | From | Jarkko Sakkinen <> | Subject | Re: [PATCH V2 16/32] x86/sgx: Support restricting of enclave page permissions |
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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
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