Re: [PATCH v26 10/22] x86/sgx: Linux Enclave Driver

[Jarkko Sakkinen]

On Thu, Feb 13, 2020 at 02:59:52PM +0100, Jethro Beekman wrote:
> Besides only partially measuring a page, there are some other fringe
> cases that are technically possible, although I haven't seen any
> toolchains that do that. These include not interleaving EADD and
> EEXTEND, not using logical ordering for the EEXTENDs, and call EEXTEND
> multiple times on the same chunk. Maximum interoperability would
> require supporting any EADD/EEXTEND sequence.

The reason why EEXTEND deals with chunks is nothing to do with the
granularity but just to amortize the algorithm. I did ask about this
and this is the answer that I got.

I think it is perfectly sane for Linux to define ABI here in at this
level.

> Tested-by: Jethro Beekman <jethro@xxxxxxxxxxxx>

Thanks you.

> Sorry for being super late with this, I know you asked me for feedback
> about this specific point in October. However, I did previously
> mention several times that being able to measure individual 256-byte
> chunks is necessary.

NP.

/Jarkko