linux-kernel - Re: [PATCH v1 0/3] TDX Guest Quote generation support

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Message-ID: <CAAYXXYxC++kRW_Kg0jieaxuwzTC2hu-9SxRjsHH_kqZW_DTE7Q@mail.gmail.com>
Date:   Mon, 27 Mar 2023 10:36:17 -0700
From:   Erdem Aktas <erdemaktas@...gle.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Guorui Yu <GuoRui.Yu@...ux.alibaba.com>,
        Du Fan <fan.du@...el.com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v1 0/3] TDX Guest Quote generation support

On Sat, Mar 25, 2023 at 11:20 PM Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>
> Hi All,
>
> In TDX guest, the attestation process is used to verify the TDX guest
> trustworthiness to other entities before provisioning secrets to the
> guest.
>
> The TDX guest attestation process consists of two steps:
>
> 1. TDREPORT generation
> 2. Quote generation.
>
> The First step (TDREPORT generation) involves getting the TDX guest
> measurement data in the format of TDREPORT which is further used to
> validate the authenticity of the TDX guest. The second step involves
> sending the TDREPORT to a Quoting Enclave (QE) server to generate a
> remotely verifiable Quote. TDREPORT by design can only be verified on
> the local platform. To support remote verification of the TDREPORT,
> TDX leverages Intel SGX Quoting Enclave to verify the TDREPORT
> locally and convert it to a remotely verifiable Quote. Although
> attestation software can use communication methods like TCP/IP or
> vsock to send the TDREPORT to QE, not all platforms support these
> communication models. So TDX GHCI specification [1] defines a method
> for Quote generation via hypercalls. Please check the discussion from
> Google [2] and Alibaba [3] which clarifies the need for hypercall based
Thanks Sathyanarayanan for submitting patches again.

I just wanted to reiterate what I said before that having a clean
TDVMCALL based interface to get TDX Quote without any virtio/vsock
dependency  is critical for us to support many use cases.