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

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Date:   Tue, 8 Aug 2023 08:14:03 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     James Bottomley <James.Bottomley@...senpartnership.com>,
        Dan Williams <dan.j.williams@...el.com>, <dhowells@...hat.com>
CC:     Brijesh Singh <brijesh.singh@....com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Dionna Amalie Glaze" <dionnaglaze@...gle.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

James Bottomley wrote:
[..]
> > This feedback cast doubt on the assumption that attestation reports
> > are infrequently generated:
> > 
> > http://lore.kernel.org/r/CAAH4kHbsFbzL=0gn71qq1-1kL398jiS2rd3as1qUFnLTCB5mHQ@mail.gmail.com
> 
> Well, I just read attestation would be called more than once at boot. 
> That doesn't necessarily require a concurrent interface.

Ok, I have not seen vigorous defense of the high frequency use case, and
that problem is solvable, it just needs a userspace daemon to front the
interface.