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

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Date:   Tue, 8 Aug 2023 10:21:02 -0700
From:   Dionna Amalie Glaze <dionnaglaze@...gle.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        dhowells@...hat.com, Brijesh Singh <brijesh.singh@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...en8.de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Samuel Ortiz <sameo@...osinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-coco@...ts.linux.dev, keyrings@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] keys: Introduce a keys frontend for attestation reports

>
> I do not see sysfs precluding a use case like that. If the kernel can
> call out to userspace for TLS connection setup [1], then advanced user
> can call out to a daemon for workload provenance setup. Recall that TDX
> will round trip through the quoting enclave for these reports and,
> without measuring, that seems to have the potential to dominate the
> setup time vs the communication to ask a daemon to convey a report.
>

It's rather hard to get new daemons approved for container
distributions since they end up as resource hogs.
I really don't think it's appropriate to delegate to a daemon to
single-thread use of a kernel interface when the interface could
provide functional semantics to begin with.

> [1]: https://lore.kernel.org/all/168174169259.9520.1911007910797225963.stgit@91.116.238.104.host.secureserver.net/



-- 
-Dionna Glaze, PhD (she/her)