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

[Jethro Beekman]

On 2021-04-01 18:11, Dave Hansen wrote:
> On 4/1/21 7:56 AM, Raoul Strackx wrote:
>>
>> SOLUTION OF THIS PATCH
>> This patch adds a new ioctl to enable userspace to execute EEXTEND leaf 
>> functions per 256 bytes of enclave memory. This enables enclaves to be 
>> build as specified by enclave providers.
> 
> I think tying the user ABI to the SGX architecture this closely is a
> mistake.
> 
> Do we need another ioctl() or can we just relax the existing add_pages
> ioctl() to allow unaligned addresses?
> 

Some version of the driver used to pass a 16-bit bitset of which of the 16 256-byte parts of a 4096-byte page to measure. This was removed at some point in favor of a separate ioctl to be added later. That is this. See the discussion linked in the cover letter.

--
Jethro Beekman | Fortanix

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