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Date:   Mon, 8 Feb 2021 11:00:20 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc:     Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kirill Shutemov <kirill.shutemov@linux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Raj Ashok <ashok.raj@intel.com>,
        Sean Christopherson <seanjc@google.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC v1 04/26] x86/tdx: Get TD execution environment information
 via TDINFO
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References: <cover.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com>
 <a5757dafc54932a6661fc94f51e413467b61fecf.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com>
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On Fri, Feb 05, 2021 at 03:38:21PM -0800, Kuppuswamy Sathyanarayanan wrote:
> +/*
> + * TDCALL instruction is newly added in TDX architecture,
> + * used by TD for requesting the host VMM to provide
> + * (untrusted) services.
> + */
> +#define TDCALL	".byte 0x66,0x0f,0x01,0xcc"

This needs a binutils version number.