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

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Date:   Mon, 25 Jul 2022 13:23:15 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Nakajima, Jun" <jun.nakajima@...el.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Isaku Yamahata <isaku.yamahata@...il.com>,
        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" <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Huang, Kai" <kai.huang@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "tim.gardner@...onical.com" <tim.gardner@...onical.com>,
        "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 5/5] x86/tdx: Add Quote generation support

On 7/25/22 13:19, Nakajima, Jun wrote:
> 3. Need to be available in minimal/early runtime environments,
> including pre-boot, e.g. guest BIOS, no user-space yet.

Jun, are we talking about the same thing here?  This patch is for a
guest userspace -> guest kernel ABI.  This facility is *FOR* userspace.
 It can't possibly be used before userspace is running.

I'm horribly confused.