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

[Sean Christopherson]

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.