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Date: Mon, 10 Aug 2020 17:52:09 -0700 From: Andy Lutomirski <luto@...capital.net> To: Sean Christopherson <sean.j.christopherson@...el.com> Cc: Andy Lutomirski <luto@...nel.org>, Nathaniel McCallum <npmccallum@...hat.com>, Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, X86 ML <x86@...nel.org>, linux-sgx@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, Jethro Beekman <jethro@...tanix.com>, Cedric Xing <cedric.xing@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, asapek@...gle.com, Borislav Petkov <bp@...en8.de>, chenalexchen@...gle.com, Conrad Parker <conradparker@...gle.com>, cyhanish@...gle.com, Dave Hansen <dave.hansen@...el.com>, "Huang, Haitao" <haitao.huang@...el.com>, Josh Triplett <josh@...htriplett.org>, "Huang, Kai" <kai.huang@...el.com>, "Svahn, Kai" <kai.svahn@...el.com>, Keith Moyer <kmoy@...gle.com>, Christian Ludloff <ludloff@...gle.com>, Neil Horman <nhorman@...hat.com>, Patrick Uiterwijk <puiterwijk@...hat.com>, David Rientjes <rientjes@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, yaozhangx@...gle.com Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call > On Aug 10, 2020, at 4:48 PM, Sean Christopherson <sean.j.christopherson@...el.com> 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.
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