From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 8FC0615A87C; Wed, 23 Jul 2025 12:05:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753272359; cv=none; b=WevKwgnkPQb9iiJY5//pJnu2EieK3xkpMloCJtGtMDqzpHDmiUlT59Com3lXehfdGlNe8mzgBSIpZtmp47HAaYeCHWkS/kji3jl0ktSXTjCnOaPaiCyeQXAeknF7EnW5YMn0f7fJ0tdOHAAf6TgI89wmoStMg0nHyR5GQ7ea/n0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753272359; c=relaxed/simple; bh=Mow2kC3IacSZWQPiIr4pg35iuks13IZ+nPS4mpSBR+8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=FI4aOYOn0cWv/G18Fg0EuYJrwGijcfHrQAKlD0eR0xtylffu5+uFWEsK1IqlcX2Sn6azZtVsshGMMdSg4uLkrrHkqUZ+4uBYtZ9xwC0DrVruG23jzin0XKfdeLGQ+3h2tdjmcheP4D29BUV6rFy3UVoEhfsFLsIyvW/tN19JWIs= 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=RgxvzIq3; arc=none smtp.client-ip=192.198.163.9 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="RgxvzIq3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1753272357; x=1784808357; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=Mow2kC3IacSZWQPiIr4pg35iuks13IZ+nPS4mpSBR+8=; b=RgxvzIq3kohAfDirt6Q8JpC8Jyl8/XngKv/V9hbqM1x0JA7auesfKCZd pzAY1WqAsVqy0rqRAc2Ebk85qjIhmPt7cyEL72rt7YOlCNu46tnw4LixC ga1OpMyeanCgwKVf2MeI7nVSxaQ9Ow0QA+UB2LKJNs7g9HVToPm446vf/ lDwhcWqKewqYCOlwSpQE+rvVbvi0RszRXngHBPI6fvjQdeEzzIldiwbrO uYKn8UoXwQfqXybdxpjoOQYa97ywxhYCGKzibbY96szGFRgr9gehOuIKw fju5Px068JSvlI5LLaAg1tYvZLSBZ+u46spDMbC2JNxydNM/rSrGZ/XqS w==; X-CSE-ConnectionGUID: yhcp6HN6SfmWrnLlf+oZcQ== X-CSE-MsgGUID: 9vis5eRXTD+l7doXCoomGw== X-IronPort-AV: E=McAfee;i="6800,10657,11501"; a="66249177" X-IronPort-AV: E=Sophos;i="6.16,333,1744095600"; d="scan'208";a="66249177" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2025 05:05:57 -0700 X-CSE-ConnectionGUID: uzyQmLCpTcOJg3Z8UVPBIw== X-CSE-MsgGUID: 8x0sJCmeTe21dMw/9gvF/g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,333,1744095600"; d="scan'208";a="183154007" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.245.72]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2025 05:05:52 -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 V4 0/2] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Date: Wed, 23 Jul 2025 15:05:37 +0300 Message-ID: <20250723120539.122752-1-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 V4: x86/tdx: Eliminate duplicate code in tdx_clear_page() Add and use tdx_quirk_reset_page() for KVM (Sean) x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Add TDX Module Base spec. version (Rick) Add Rick's Rev'd-by 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 | 20 +++++++++++++++----- 3 files changed, 20 insertions(+), 27 deletions(-) Regards Adrian