From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) (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 B966F2DE6F1; Thu, 3 Jul 2025 15:37:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751557052; cv=none; b=K7buz8H/VtNAO6xnxw6rjG/AYw/sqSeCNkRvuKU4OGVyPtvXTTD0zOCDTQ2t/+H1Cq2AzFezXG0PgewUcYQY105yHehaYFirZwph5nDoRC3WzSY9xDzccZ8L78L6kJkCK+QbV1OSni7Q5YtCUW8/0btCrySBV0PXaoaZF6R2g+o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751557052; c=relaxed/simple; bh=PG8kZ/GY/zO2V+FT8JqnduyAZzDlLNvlfDqA7IsapfQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=NRkJgU/NT5Lo1dq5PK38OwIVYxwXG1tV4jWAqW3H6H31G2St2hHrL0quTed481JbIs2IeTmhzfQIP7xoib0tZeHfq23aXaCo24taVBvONKRjcVjtoDgMtId8BsNY3a9yyT+/Gv0FGbMkio13gxspYV6tPsnXm5GOICxTmE8iUr4= 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=nToDnmAz; arc=none smtp.client-ip=198.175.65.9 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="nToDnmAz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1751557051; x=1783093051; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=PG8kZ/GY/zO2V+FT8JqnduyAZzDlLNvlfDqA7IsapfQ=; b=nToDnmAzLKebl/FMJ1TcMJg8usn7Zc6boPp5uqAF0aPWPUssWj0W1GPk MOsdPKjUwKC77pIy9UZ38cQ1Z+IhGORxW+LJO1bCkszwlFrImoPTTqpRQ OnFtUnXrwoKkNtebTBzR8+VyPmKQUa7+RAZ+CfcwYfb7Xf4onFkS2+Jty UmEp7jOICnAj356zCmfuz3b8lNZYPVUuhH+Jche5yJ+FFvIwO44fpJd6L tOBs6IXskdXuk/JpADIYDz1KWV63w67Q6UgnDyBRzP4lw7pZSDZGwR2EH BOCBdv5+A4QgL8Ew6LkCutcRUukgRtO1feGG3wXYpw99UJ9Am4iH70uBY Q==; X-CSE-ConnectionGUID: g4ZBJZW+QCyvOFnGgbEBvQ== X-CSE-MsgGUID: tiFrVgvjRAi2UTe5UDtWcg== X-IronPort-AV: E=McAfee;i="6800,10657,11483"; a="76436646" X-IronPort-AV: E=Sophos;i="6.16,284,1744095600"; d="scan'208";a="76436646" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jul 2025 08:37:30 -0700 X-CSE-ConnectionGUID: xWjytiHcTkOP31GxAiNVqQ== X-CSE-MsgGUID: CQyWMTkbRayFjFD2y4kOdg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,284,1744095600"; d="scan'208";a="178065068" Received: from johunt-mobl9.ger.corp.intel.com (HELO localhost.localdomain) ([10.245.244.86]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jul 2025 08:37:25 -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, kirill.shutemov@linux.intel.com, 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 V2 0/2] x86/tdx: Skip clearing reclaimed pages unless X86_BUG_TDX_PW_MCE is present Date: Thu, 3 Jul 2025 18:37:10 +0300 Message-ID: <20250703153712.155600-1-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 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 | 13 +++++++++++-- 3 files changed, 16 insertions(+), 24 deletions(-) Regards Adrian