From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 20ABD1FECA1; Thu, 24 Jul 2025 13:04:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753362253; cv=none; b=UClaYJ7EnE+FYAoRHuJMSj3DPmGlSPukwdy7IJgcZGXCtyhJjRIL0TTthXBK1zp84c/nl2j17vyUdiAv/0aVUWRzal66Vv5YvmuTwfSsQEW1N+cYIN0OdSPhfRGUlmi02G92Mv+V0Und9gRIfK9jsUctFeFrdiDBdyIeXWo3t8Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753362253; c=relaxed/simple; bh=wqF6O/RajDlUzZLf3o7faiOAdbJO7ryL0x31/07G3sI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=J7eWcWu+yD/9u1g3Jjz4Ykz/mOYKvIAStutZpeZjaq0XksIBDGHjrMqN9nLEmhb84ex/N8WtzXE/WSFRdjPw37sPIUiympVkS1XsyhcGtQN/Kn6Vqoke5PHdMeDHgsCSPR4wtNep5uEw6C8d1WQM6rw7QUdVhmcgbdlEKGPassA= 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=XW2ex7ZA; arc=none smtp.client-ip=198.175.65.14 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="XW2ex7ZA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1753362252; x=1784898252; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=wqF6O/RajDlUzZLf3o7faiOAdbJO7ryL0x31/07G3sI=; b=XW2ex7ZArckRpQedSpBT0WY4eJRYzZFmAnaFZ/lfvUKYVE/9qT9hxIDz K9V5SENC7vakDbZfzvEesH1uPo+T+2HY+ZkzeozjmWwkg94wnn4SPTgtc 3+J9GooDfu2qHnWDdqBNtghjx7QL2rOW1SejS1PLVIC+hscNDuJZzpyOa cJJbf0gaW4gml/zX2KHNO0UalB6WO5LK0bDsc9C23lrZBLGhmHaF5e0HI InQL9UE6FKO93v0ihjGjX1eYuWriDlV6WnY6IyLW8c9cDPTP+YAAeE5UQ c3kFaVeF7jd9kUfg73X4K8k0fbVPIJKUHrqBChlpVVb/ADilgWGFFRYZK w==; X-CSE-ConnectionGUID: vKHQHW+tRaKmTKO/nIVVtw== X-CSE-MsgGUID: D8LZJtubRZKw7kIMbU+u8w== X-IronPort-AV: E=McAfee;i="6800,10657,11501"; a="59480653" X-IronPort-AV: E=Sophos;i="6.16,337,1744095600"; d="scan'208";a="59480653" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2025 06:04:12 -0700 X-CSE-ConnectionGUID: TJlSrT+aTO+xNXCHZhNfWA== X-CSE-MsgGUID: cfr6l25WRIiYv3l29eovWQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,337,1744095600"; d="scan'208";a="165598951" Received: from sschumil-mobl2.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.244.21]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2025 06:04:06 -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 V6 0/3] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Date: Thu, 24 Jul 2025 16:03:51 +0300 Message-ID: <20250724130354.79392-1-adrian.hunter@intel.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: kvm@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 V6: x86/tdx: Eliminate duplicate code in tdx_clear_page() Add Sean's Ack x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Add Xiaoyao's Rev'd-by 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