From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (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 00E8A3B19A; Tue, 22 Jul 2025 13:16:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753190171; cv=none; b=lgVnicm94IbdR9lzsyHBIl04xVUjjZYsY9QTs9lG052Hm7rU8h0ba/mjgBSTqZJzI02PN3ICdfAGPZ/kksjEH1fUzn6S9miHhVwKQO0FxkXySGw7JkHIdqEuDc38ha2kT5Ph0rPRe1AC/33F4T46bs3GOMFt235bBbIYLB9nvCc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753190171; c=relaxed/simple; bh=2ur+ftjY34EO8tfo3ES9C3DWlfzYj9Fk8ptTogFmi1A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=O+B72NJ5AddVnP5wpDmi/77lcvbkSFNOvm4SVNU1huIU6nYTEBQwas7m2d3oy6toWhpj+xUzs9rFwXP5jGKQBmiuydZu9sum9lBYyANWHJDuHzyx11mHYxqiCZBF762vo0Y/VgsITuWDwSGwCC/t1ma4SZuOWsyyMLtMy9SyoIo= 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=MtrjH8Wp; arc=none smtp.client-ip=198.175.65.10 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="MtrjH8Wp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1753190170; x=1784726170; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=2ur+ftjY34EO8tfo3ES9C3DWlfzYj9Fk8ptTogFmi1A=; b=MtrjH8WpD4glPakZQiR+Sb/FEZVSfStV2+IdmzAEQnTHRO3eXJoaNDf3 +6xJCO+R9sX2Hti1W4ErDU9KewfcV1MzN3tSts3aMoLmhpjFmD6wXxQIZ NZzpgDO3yNyRKf95rnp7ipSt3fCL1+5YlGmu8SE3Nl9Eb4BOgDZf7DTrg D3Kej8EVULXTOchU54bFBbYjNdhcO0s2ncojX+7NgAx0JunFm0P3/UBIR FbT1V7Nu5yqUk3CbFVbDslBY+/ZVcaoOpZmJY4ta6/8P0xb9FV9Gfm3gz wc1mH62I/KTTrhFq/ay3lSs8FaDh3Bxaw3XDHAaeFBiBUe+dPB188NhDO w==; X-CSE-ConnectionGUID: ssW2ilLuQKyhXtDN2ltk6Q== X-CSE-MsgGUID: OlgZtIr/RlSiH1UNXPyNRQ== X-IronPort-AV: E=McAfee;i="6800,10657,11500"; a="72893078" X-IronPort-AV: E=Sophos;i="6.16,331,1744095600"; d="scan'208";a="72893078" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jul 2025 06:15:54 -0700 X-CSE-ConnectionGUID: QwNXoEkaQLyJ79Y1adJ/bQ== X-CSE-MsgGUID: 5Dn9xFp9TuiNoX2nzDz5gA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,331,1744095600"; d="scan'208";a="163695133" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.244.161]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jul 2025 06:15:48 -0700 From: Adrian Hunter To: Dave Hansen , pbonzini@redhat.com, seanjc@google.com, vannapurve@google.com Cc: Tony Luck , Borislav Petkov , Thomas Gleixner , Ingo Molnar , x86@kernel.org, H Peter Anvin , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rick.p.edgecombe@intel.com, kas@kernel.org, kai.huang@intel.com, reinette.chatre@intel.com, xiaoyao.li@intel.com, tony.lindgren@linux.intel.com, binbin.wu@linux.intel.com, isaku.yamahata@intel.com, yan.y.zhao@intel.com, chao.gao@intel.com Subject: [PATCH V3 0/2] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Date: Tue, 22 Jul 2025 16:15:31 +0300 Message-ID: <20250722131533.106473-1-adrian.hunter@intel.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Content-Transfer-Encoding: 8bit Hi Here are 2 small self-explanatory patches related to clearing TDX private pages. Patch 1 is a minor tidy-up. In patch 2, by skipping the clearing step, shutdown time can improve by up to 40%. Changes in V3: x86/tdx: Eliminate duplicate code in tdx_clear_page() Explain "quirk" rename in commit message (Rick) Explain mb() change in commit message (Rick) Add Rev'd-by, Ack'd-by tags x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Remove "flush cache" comments (Rick) Update function comment to better relate to "quirk" naming (Rick) Add "via MOVDIR64B" to comment (Xiaoyao) Add Rev'd-by, Ack'd-by tags Changes in V2 (as requested by Dave): x86/tdx: Eliminate duplicate code in tdx_clear_page() Rename reset_tdx_pages() to tdx_quirk_reset_paddr() Call tdx_quirk_reset_paddr() directly x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Improve the comment Adrian Hunter (2): x86/tdx: Eliminate duplicate code in tdx_clear_page() x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present arch/x86/include/asm/tdx.h | 2 ++ arch/x86/kvm/vmx/tdx.c | 25 +++---------------------- arch/x86/virt/vmx/tdx/tdx.c | 15 ++++++++++----- 3 files changed, 15 insertions(+), 27 deletions(-) Regards Adrian