Re: [PATCH RESEND 0/3] x86/sgx: eextend ioctl

[Jethro Beekman]

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?

--
Jethro Beekman | Fortanix

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