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X-CSE-ConnectionGUID: WkcLE3NbTNqdc5ogmLqvFQ== X-CSE-MsgGUID: m4TCWvpeSouGUu6Bldy5HA== X-IronPort-AV: E=McAfee;i="6800,10657,11568"; a="61310258" X-IronPort-AV: E=Sophos;i="6.18,302,1751266800"; d="scan'208";a="61310258" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2025 12:01:49 -0700 X-CSE-ConnectionGUID: 2LvRxJ86TiincwGX7t1JNw== X-CSE-MsgGUID: ooiG/0MBSLK8dPY5Y/0BPA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,302,1751266800"; d="scan'208";a="209265232" Received: from rchatre-mobl4.amr.corp.intel.com (HELO [10.125.109.105]) ([10.125.109.105]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2025 12:01:47 -0700 Message-ID: <3921d500-36ce-409c-8730-6be86a40e334@intel.com> Date: Mon, 29 Sep 2025 12:01:47 -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 v4 03/17] x86/fpu/xstate: Add xsaves_nmi To: "Mi, Dapeng" , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Dave Hansen , Ian Rogers , Adrian Hunter , Jiri Olsa , Alexander Shishkin , Kan Liang , Andi Kleen , Eranian Stephane Cc: Mark Rutland , broonie@kernel.org, Ravi Bangoria , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Dapeng Mi References: <20250925061213.178796-1-dapeng1.mi@linux.intel.com> <20250925061213.178796-4-dapeng1.mi@linux.intel.com> <8476ee65-546a-47ff-951c-5b2a24995ccf@linux.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 9/27/25 22:31, Mi, Dapeng wrote: >> Also, what supervisor components are involved here? Aren't we just >> talking about [XYZ]MM's? > Besides the SIMD registers [XYZ]MM, the CET_USR (only SSP) and APX eGPRs > would be supported as well. We should think long and hard about whether to use XSAVE for the CET SSP. I'm not convinced it's worth it.