Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call

From: Andy Lutomirski
Date: Mon Aug 10 2020 - 20:52:14 EST

> On Aug 10, 2020, at 4:48 PM, Sean Christopherson <sean.j.christopherson@xxxxxxxxx> wrote:
> On Mon, Aug 10, 2020 at 04:08:46PM -0700, Andy Lutomirski wrote:
>> What am I missing? I still don't really understand why we are
>> supporting this mechanism at all. Just the asm code to invoke the
>> callback seems to be about half of the entire function.
> Because the Intel SDK (and other SDKs?) wants to use the host stack to pass
> parameters out of the enclave.

Ugh, right. I forgot about that particular abomination.

I suppose that passing a context pointer would be reasonable.