linux-kernel - Re: [PATCH] docs: security: Confidential computing intro and threat model

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Message-ID: <ZEmBULXp24oMxaUH@google.com>
Date:   Wed, 26 Apr 2023 12:53:52 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Carlos Bilbao <carlos.bilbao@....com>
Cc:     Elena Reshetova <elena.reshetova@...el.com>,
        "corbet@....net" <corbet@....net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
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        Andrew Bresticker <abrestic@...osinc.com>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        Dylan Reid <dylan@...osinc.com>,
        Ravi Sahita <ravi@...osinc.com>
Subject: Re: [PATCH] docs: security: Confidential computing intro and threat model

On Wed, Apr 26, 2023, Carlos Bilbao wrote:
> On 4/26/23 10:51 AM, Sean Christopherson wrote:
> > This document is named confidential-computing.rst, not tdx-and-snp.rst.  Not
> > explicitly mentioning SEV doesn't magically warp reality to make descriptions like
> > this one from security/secrets/coco.rst disappear:
> > 
> >   Introduction                                                                    
> >   ============                                                                    
> >                                                                                 
> >   Confidential Computing (coco) hardware such as AMD SEV (Secure Encrypted        
> >   Virtualization) allows guest owners to inject secrets into the VMs              
> >   memory without the host/hypervisor being able to read them.
> > 
> > My complaint about this document being too Intel/AMD centric isn't that it doesn't
> > mention other implementations, it's that the doc describes CoCo purely from the
> > narrow viewpoint of Intel TDX and AMD SNP, and to be blunt, reads like a press
> > release and not an objective overview of CoCo.
> 
> Be specific about the parts of the document that you feel are too
> AMD/Intel centric, and we will correct them.

The whole thing?  There aren't specific parts that are too SNP/TDX centric, the
entire tone and approach of the document is wrong.  As I responded to Dave, I
would feel differently if the document were named tdx-and-snp-threat-model.rst,
but this patch proposes a generic confidential-computing.rst and presents the
SNP+TDX confidential VM use case as if it's the *only* confidential computing use
case.