linux-kernel - Re: [PATCH v8 5/5] x86/tdx: Add Quote generation support

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Message-ID: <30220ec4-d35f-4a8a-4c08-959765ea6f26@intel.com>
Date:   Fri, 22 Jul 2022 14:24:33 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Isaku Yamahata <isaku.yamahata@...il.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,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org,
        "Nakajima, Jun" <jun.nakajima@...el.com>
Subject: Re: [PATCH v8 5/5] x86/tdx: Add Quote generation support

On 7/22/22 14:18, Sathyanarayanan Kuppuswamy wrote:
> For cases where your platform does not want to support or enable the generic
> interface (like vsock), isn't it better to have a fallback approach? I am not
> saying we should have such an ABI for all cases. But attestation is a must-have
> feature for the TDX guest, and we want to support it in all TD guest platforms.
> I think the GHCI ABI is added to meet this requirement.

This logic is basically: it's in the spec so it must be useful.  I don't
buy that, sorry.