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X-CSE-ConnectionGUID: nrJCbXX4QFOenUOjNX8E6g== X-CSE-MsgGUID: +XjR805IS8GYz+B5dW5gzQ== X-IronPort-AV: E=McAfee;i="6700,10204,11414"; a="64819125" X-IronPort-AV: E=Sophos;i="6.15,240,1739865600"; d="scan'208";a="64819125" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Apr 2025 15:07:02 -0700 X-CSE-ConnectionGUID: nLXX5gdUTGKCxvrgnbBHOA== X-CSE-MsgGUID: cZrf9MoISYGORnIlKvEWJA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,240,1739865600"; d="scan'208";a="133946281" Received: from uaeoff-desk2.amr.corp.intel.com (HELO [10.124.222.49]) ([10.124.222.49]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Apr 2025 15:07:02 -0700 Message-ID: <4b4ecaa1-2ace-43bf-b71b-0de78bcf113c@intel.com> Date: Fri, 25 Apr 2025 15:07:00 -0700 Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] x86/sgx: Implement EUPDATESVN and opportunistically call it during first EPC page alloc To: Sean Christopherson Cc: Elena Reshetova , "jarkko@kernel.org" , Kai Huang , "linux-sgx@vger.kernel.org" , Vincent Scarlata , "x86@kernel.org" , Vishal Annapurve , Chong Cai , Asit K Mallick , Erdem Aktas , "linux-kernel@vger.kernel.org" , "bondarn@google.com" , "dionnaglaze@google.com" , Scott Raynor References: <0d7d6b9a-e7bd-4225-8f08-05bd9473a894@intel.com> 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 4/25/25 14:58, Sean Christopherson wrote: > On Fri, Apr 25, 2025, Dave Hansen wrote: >> On 4/25/25 14:04, Sean Christopherson wrote: >>> Userspace is going to be waiting on ->release() no matter what. >> Unless it isn't even involved and it happens automatically. > With my Google hat on: no thanks. I'm completely open to the idea of adding transparency so that folks can tell when the SVN increments. I'm mostly open to having a new ABI to do it explicitly in addition to doing it implicitly.] > Coupled with adding latency to launching the 0=>1 enclave, just to > handle something that happens a few times per year, and I don't see > any value in automatic updates. Maybe it sounds nice on paper, but > from my perspective, I see nothing but pain. I'm not worried about the latency until I see numbers. If the number show it's horrible, then we either change course or go yell at the folks who wrote the xucode.