linux-kernel - Re: [PATCH 0/4] keys: Introduce a keys frontend for attestation reports

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Message-Id: <CUHFLMO6MJBP.1AHYJWGAEEEKT@suppilovahvero>
Date:   Tue, 01 Aug 2023 21:48:50 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>
Cc:     "sameo@...osinc.com" <sameo@...osinc.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "dionnaglaze@...gle.com" <dionnaglaze@...gle.com>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 0/4] keys: Introduce a keys frontend for attestation
 reports

On Tue Aug 1, 2023 at 1:41 AM EEST, Huang, Kai wrote:
> On Mon, 2023-07-31 at 10:09 +0000, Jarkko Sakkinen wrote:
> > > This facility is different, it is just aiming to unify this attestation
> > > report flow. It scales to any driver that can provide the ->auth_new()
> > > operation. I have the sev-guest conversion in this set, and Sathya has
> > > tested this with tdx-guest. I am hoping Samuel can evaluate it for
> > > cove-guest or whatever that driver ends up being called.
> > 
> > What about SGX without TDX?
>
> SGX attestation is completely among userspace enclaves, and the existing SGX
> userspace stack has fully adopted what is needed to do attestation.  Why do we
> need to cover SGX?

I have no answer to that. I'm merely trying to understand what this is.

BR, Jarkko