From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E45BE1FDD; Wed, 24 Sep 2025 18:32:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758738760; cv=none; b=Q6tMqcTnWs04i9OngKrV/TI2GJ2X90RNBhCOOYwHqO3lrdhYSY8Dijdnghf4zXpx4oLVCLGYtei3b/pCILmhElhZMdcWiktYt7c+gNf94IilhykjhPH/JZkwj8G2KmTW6Grxj8UbENfBw78ZGxUsyKqUUum2m2k5EpBtmaZIv5E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758738760; c=relaxed/simple; bh=bWIP0s6qalOqwGClINFJAxRrfc9GlOcLTVMnDwKSddc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=EWLYCMUlSWH98XNA4DfFRqUDBJsUQuRnqP0FvLvsiKDVBZCbFUksxlJtE4lPsCx/X+RuV1QxcHQzpg9l5Hv2MIz7SgPzwF1GdUCyx+qoxfgn2VYUc/F5S4B/4GQ6tW6msxM2E84Iu5GvVLJrihtQZ3As0uSuulcqlcoBnrmQTwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=blzgtiUE; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="blzgtiUE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1758738759; x=1790274759; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=bWIP0s6qalOqwGClINFJAxRrfc9GlOcLTVMnDwKSddc=; b=blzgtiUEGnx8qO6OTLP9ztwgvDs3/JLki4ZipS/fC0i2ZhruVF2d5pc9 mPZTRXeHgiv47pjSdW1gyB8yy/VpDr6+0hNcROzuHYIhryo85zL0fF50v hbQZWdXi1vODBNU/Cq1TXpz1bBQieZ1Mpl8+P2WkFvLM+yEZHOSs05hqR zWPV+YKfkz61+PQ7itrPuke4wGlqWDrEkwAXRM+IzyX2Qp7vcLKdhK+Sc X6FykMNMmc8Zg2amkdIzSvz9hYviP6+VvJ2Z4OCMsuxdQ2vQLZyo8LR9W LvYxXrUMKQhwN8/OcsEbmABkDnU+pj5+jyARAaV/gdZiE1xEcD8nnRxKB Q==; X-CSE-ConnectionGUID: hMI0beWjSWuBJ+q540HHwQ== X-CSE-MsgGUID: xXA89S2uSXmpjFztJg/HfQ== X-IronPort-AV: E=McAfee;i="6800,10657,11563"; a="71291185" X-IronPort-AV: E=Sophos;i="6.18,291,1751266800"; d="scan'208";a="71291185" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2025 11:32:38 -0700 X-CSE-ConnectionGUID: gDmB2CbwT/+7lDKkxN4p+A== X-CSE-MsgGUID: wmLqxbxnQieeaEOwqUbiyA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,291,1751266800"; d="scan'208";a="182386249" Received: from tfalcon-desk.amr.corp.intel.com (HELO [10.125.108.203]) ([10.125.108.203]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2025 11:32:37 -0700 Message-ID: <5490118a-7185-44fe-b816-b01c8ff75979@intel.com> Date: Wed, 24 Sep 2025 11:32:36 -0700 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [External] Re: [RFC 0/5] parker: PARtitioned KERnel To: Fam Zheng Cc: linux-kernel@vger.kernel.org, Lukasz Luba , linyongting@bytedance.com, songmuchun@bytedance.com, satish.kumar@bytedance.com, Borislav Petkov , Thomas Gleixner , yuanzhu@bytedance.com, Ingo Molnar , Daniel Lezcano , Zhang Rui , fam@euphon.net, "H. Peter Anvin" , x86@kernel.org, liangma@bytedance.com, Dave Hansen , "Rafael J. Wysocki" , guojinhui.liam@bytedance.com, linux-pm@vger.kernel.org, Thom Hughes References: <20250923153146.365015-1-fam.zheng@bytedance.com> <40419dea-666e-4a8d-97a7-fa571d7122f4@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/24/25 09:21, Fam Zheng wrote: ... > The model and motivation here is not to split the domain and give > different shares to different sysadmins, it's intended for one kernel > to partition itself. I agree we shouldn't have different kernels here: > one old, one new, one Linux, one Windows... All partitions should run > a verified parker-aware kernel. Actually, it may be a good idea to > force the same buildid in kexec between the boot kernel and secondary > ones. Uhhh.... From the cover letter: > Another possible use case is for different kernel instances to have > different performance tunings, CONFIG_ options, FDO/PGO according to > the workload. Wouldn't the buildid change with CONIFG_ options and FDO/PGO? Thank you for posting this series. It's interesting and a thought provoking. But, that's where it stops for me. I don't think this approach has any future upstream. I probably won't look at it again, even if it hits my inbox. (I hope it _isn't_ sent again unless there is some *MAJOR* *MAJOR* change to the approach).