linux-kernel - Re: [PATCH v3 3/3] selftests/tdx: Test GetQuote TDX attestation feature

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Message-ID: <64961d37eafda_142af829411@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Fri, 23 Jun 2023 15:31:20 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Aktas, Erdem" <erdemaktas@...gle.com>
CC:     "corbet@....net" <corbet@....net>, "Du, Fan" <fan.du@...el.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "dionnaglaze@...gle.com" <dionnaglaze@...gle.com>,
        "qinkun@...che.org" <qinkun@...che.org>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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        "chongc@...gle.com" <chongc@...gle.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "Yu, Guorui" <guorui.yu@...ux.alibaba.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v3 3/3] selftests/tdx: Test GetQuote TDX attestation
 feature

Huang, Kai wrote:
> On Thu, 2023-06-22 at 16:31 -0700, Erdem Aktas wrote:
> > So while I like the suggested direction, I am not sure how much it is
> > possible to come up with a common ABI even with just only for 2
> > vendors (AMD and Intel) without doing spec changes which is a multi
> > year effort imho.
> 
> I don't want to intervene the discussion around whether this direction is
> correct or not, however I want to say request_key() may not be the right place
> to fit Quote (or remote verifiable data blob in general for attestation).
> 
> > request_key(coco_quote, "description", "<uuencoded tdreport>")
> 
> Although both key and Quote are data blob in some way, Quote certainly is not a
> key but have much more information.  The man page of request_key() seems to
> suggest it's just for key:
> 
>        request_key - request a key from the kernel's key management
>        facility
> 

Read further in that man page and see the example of generic user
defined value stored as a "key". A "key" is just a blob that has meaning
to access other resources / instantiate other keys.