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X-CSE-ConnectionGUID: Ku7jDhtUSR6xpcef55v3zw== X-CSE-MsgGUID: 8jKsacfFR8GMg500wMg1Lw== X-IronPort-AV: E=McAfee;i="6800,10657,11818"; a="92843152" X-IronPort-AV: E=Sophos;i="6.24,206,1774335600"; d="scan'208";a="92843152" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jun 2026 08:57:08 -0700 X-CSE-ConnectionGUID: W4YCSpG4S+iGBFege3HjCQ== X-CSE-MsgGUID: JkQwHcWaR4GhmFbreoL9uA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,206,1774335600"; d="scan'208";a="249400358" Received: from bradocaj-mobl.ger.corp.intel.com (HELO [10.125.111.24]) ([10.125.111.24]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jun 2026 08:57:07 -0700 Message-ID: <1fc76b45-a25b-41a7-b7fa-06650c8052fb@intel.com> Date: Mon, 15 Jun 2026 08:57:09 -0700 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/15] Enable TDX Module Extensions and DICE-based TDX Quoting To: Xu Yilun , "Dan Williams (nvidia)" Cc: kas@kernel.org, rick.p.edgecombe@intel.com, x86@kernel.org, peter.fang@intel.com, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, sohil.mehta@intel.com, yilun.xu@intel.com, baolu.lu@linux.intel.com, zhenzhong.duan@intel.com, xiaoyao.li@intel.com References: <20260522034128.3144354-1-yilun.xu@linux.intel.com> <6a2c821a99e3_9b8551002a@djbw-dev.notmuch> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/15/26 08:22, Xu Yilun wrote: >> The TDX "Extension SEAMCALL" capability is akin to ARM CCA's "Stateful >> RMI Operations (SRO)", and achieves similar externalized complexity >> relief as a dedicated hardware coprocessor like AMD SEV-SNP. The > I may not include the ARM/AMD examples, not sure I can explain them > well. I actually think they're pretty important proof points. One of the big challenges as a maintainer evaluating these things is judging the solution itself. Is this architecture a good one? Is it overly complex? Are the avenues for simplification? If five vendors pop up all with similar problems and solutions, then it's a pretty good bet that they're all on the right track. But, if there are four going one direction and one going off by itself, it's a sign that the errant one might need a course correction. It would honestly be worth your time to go *talk* to the AMD and ARM folks and ensure that you are all on the same page. Last I checked, they seemed to be at least halfway reasonable human beings and don't bite. Let me know if I can help with some introductions.