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X-CSE-ConnectionGUID: FrVb0ur7RKKWfpyzRYDupQ== X-CSE-MsgGUID: IwCheHWTRZG7hA2+9CCnlQ== X-IronPort-AV: E=McAfee;i="6800,10657,11848"; a="88640619" X-IronPort-AV: E=Sophos;i="6.25,169,1779174000"; d="scan'208";a="88640619" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2026 06:10:49 -0700 X-CSE-ConnectionGUID: c6avEGkyQ4yN6NBGwK3vxA== X-CSE-MsgGUID: CviLe6BbQN2HwEZdn07ZSQ== X-ExtLoop1: 1 Received: from gabaabhi-mobl2.amr.corp.intel.com (HELO [10.125.109.66]) ([10.125.109.66]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2026 06:10:48 -0700 Message-ID: <205dee48-3238-4d86-adc3-365a8a5d62b8@intel.com> Date: Fri, 17 Jul 2026 06:10:47 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] x86/virt/tdx: Formalize SEAMCALL version encoding support To: Nikolay Borisov , Xu Yilun , Kiryl Shutsemau Cc: x86@kernel.org, linux-kernel@vger.kernel.org, rick.p.edgecombe@intel.com, dave.hansen@linux.intel.com, yilun.xu@intel.com, chao.gao@intel.com, djbw@kernel.org, linux-coco@lists.linux.dev, peter.fang@intel.com, xiaoyao.li@intel.com References: <20260708170330.83850-1-yilun.xu@linux.intel.com> <90685b93-e13e-4509-98f3-4509381d4981@suse.com> Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/17/26 01:21, Nikolay Borisov wrote: > At the end of the day the layout of args is the software API that is > presented to the rest of the system, the ABI is a low level detail > handled in TDX_MODULE_CALL. Yep, that's my basic view of it too. I don't feel strongly about where the structure is translated over to the hardware registers of the actual module ABI call, as long as it's consistent and centralized.