From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 051E71E4A4; Thu, 24 Jul 2025 12:48:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753361310; cv=none; b=Ss2uAfm+b/Qe9Oegr5PNYJyuZrKN1EULEOT352wDnSv3hKUYIG6QHvJt9Ht8BJrbFfJ02yhOON0/hKaKdXHJMwL/GA0UO4BVogDvxKTGZPg/Fm5r/IMJe8y6CpY1JhJEasp6f1FsVA1QAog8cAOtkBB2nsWWaLyci/BzQ+TPhgQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753361310; c=relaxed/simple; bh=f6B8tyg4/DD96dDjC8BDeC/T9795XQNZuf4iiTQjIU4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=P6LhE0KUWQ1Ih1liI+HlwddxbM8XUiILyZVgkeW5srR5UXxQb9uU3dd7zbhQ6Xg9CUQgfIlZeU+rQyaRvo2gyycalhpm7kpVTXmyz6LHWOBcGWUbcD32NHLxhMwMyRduePx8RCr0q92qolkaV/r7OKrfOgi0gbU/PrKtW0+Yfjc= 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=ly8SNqXX; arc=none smtp.client-ip=192.198.163.8 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="ly8SNqXX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1753361309; x=1784897309; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=f6B8tyg4/DD96dDjC8BDeC/T9795XQNZuf4iiTQjIU4=; b=ly8SNqXXYW+VCcQ7ID/bRAsAOzs+NLZRdc+4JZstX86GIRMwVlQJwXAT iErDVdQ3FRgv/EDlGfjdD8ClJLDc6wZ+MRDiEZy5W/OSBIWKjDPZNEv5u 4uGy0899rwPYZynbSF0JQVg0onqEe6iXZf6H8fualD64TA+7C/BK/9y9T rfTwWK0A6pQKy8Mgdb1H85STKDkgJqwgK2imb4s/CbQEGRhJw8x7Fqt75 uTKcsYDfFbQ59Ovg4h7BZClKEMgx/r6At8/atvuX2w/a1T8Ov1fJaSwt9 jFo++de2YJ29uTrziqYGBfFTPI+jGjLXPp9CT6v6H+cYX8/sxUPKDGGpr Q==; X-CSE-ConnectionGUID: VcNMZ9TKSZmxrH5FL+qK3A== X-CSE-MsgGUID: gnwrimpBQP+M4CE3/lYB0w== X-IronPort-AV: E=McAfee;i="6800,10657,11501"; a="73253580" X-IronPort-AV: E=Sophos;i="6.16,337,1744095600"; d="scan'208";a="73253580" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2025 05:48:29 -0700 X-CSE-ConnectionGUID: Ow1Je+GkTqaOxwnNXcDx/w== X-CSE-MsgGUID: 6gTtnYi0RQ+zulqJKixC2g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,337,1744095600"; d="scan'208";a="159460392" Received: from sschumil-mobl2.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.244.21]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2025 05:48:23 -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 V5 0/3] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Date: Thu, 24 Jul 2025 15:48:08 +0300 Message-ID: <20250724124811.78326-1-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 3 small self-explanatory patches related to clearing TDX private pages. Patch 1 and 2 are minor tidy-ups. In patch 3, by skipping the clearing step, shutdown time can improve by up to 40%. Changes in V5: x86/tdx: Tidy reset_pamt functions New patch 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 (3): x86/tdx: Eliminate duplicate code in tdx_clear_page() x86/tdx: Tidy reset_pamt functions 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 | 36 +++++++++++++++++++----------------- 3 files changed, 24 insertions(+), 39 deletions(-) Regards Adrian