On Fri, Apr 02, 2021 at 08:31:19PM +0200, Jethro Beekman wrote: > On 2021-04-02 17:53, Dave Hansen wrote: > > On 4/2/21 1:38 AM, Jethro Beekman wrote: > >>> So, we're talking here about pages that have been EEADDED, but for > >>> which we do not want to include the entire contents of the page? > >>> Do these contents always include the beginning of the page, or can > >>> the holes be anywhere? > >> Holes can be anywhere, and EEXTEND calls need not be sequential in > >> memory address or even relate to the most recently EADDed page. > > > > I think you're referring to the SGX architecture itself here. The > > architecture permits this, right? > > Yes. > > > But, why would an enclave loader application ever do this? > > e.g. to save space > > > Is this something we want to support in Linux? > > Why not? Is there a good reason to not fully support this part of the CPU architecture? Yes, in generic sense :-) If one would disagree, that would be same as saying that everything should execute in ring-0 because that only gives "full support". /Jarkko
