From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A76E4C4321E for ; Mon, 28 Nov 2022 22:19:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234332AbiK1WTz (ORCPT ); Mon, 28 Nov 2022 17:19:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234136AbiK1WTw (ORCPT ); Mon, 28 Nov 2022 17:19:52 -0500 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2B6E30560; Mon, 28 Nov 2022 14:19:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669673992; x=1701209992; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=DDlfWZUlARzDLRqCwElfV+jgzwGklKaNoE/QKHbN2sE=; b=FTFfwXrfIIAwejW8QcJhT2H6PKCKEx1ZXJFgDdFg3pfGYjHDPkAD2lO1 YEa3limk+yQ7g4TiWedbXEAwlOt7bT/LMcyKhiGxLtCXq/Dwsrz6k6PLN JcSEkV0BPLxpuh65b5qJcHsSAOABUJDuvq14BL4n/wGM1SSUydZwUJd6m X3lB6kJUZwCp/PSpmXMpL3rEoKVgxd6lxUvXkL/Gx/RMMQ0gnJIKoCf++ Pgtm96i+SRXairy86FlSC2z2xf8ud4D83fMAMtGXECO+J9T1LNYb8u5j6 CdqctTisod37iOJQGWujm4gtZqrHK1E3Jb3j/wKblhWmVwBzF5/htOMHa A==; X-IronPort-AV: E=McAfee;i="6500,9779,10545"; a="341879020" X-IronPort-AV: E=Sophos;i="5.96,201,1665471600"; d="scan'208";a="341879020" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Nov 2022 14:19:51 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10545"; a="645662857" X-IronPort-AV: E=Sophos;i="5.96,201,1665471600"; d="scan'208";a="645662857" Received: from nroy-mobl1.amr.corp.intel.com (HELO [10.212.209.4]) ([10.212.209.4]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Nov 2022 14:19:50 -0800 Message-ID: Date: Mon, 28 Nov 2022 14:19:50 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Subject: Re: [PATCH v7 11/20] x86/virt/tdx: Add placeholder to construct TDMRs to cover all TDX memory regions Content-Language: en-US To: "Huang, Kai" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" Cc: "Luck, Tony" , "bagasdotme@gmail.com" , "ak@linux.intel.com" , "Wysocki, Rafael J" , "kirill.shutemov@linux.intel.com" , "Christopherson,, Sean" , "Chatre, Reinette" , "pbonzini@redhat.com" , "linux-mm@kvack.org" , "Yamahata, Isaku" , "Shahar, Sagi" , "imammedo@redhat.com" , "Gao, Chao" , "Brown, Len" , "peterz@infradead.org" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "Huang, Ying" , "Williams, Dan J" References: <32c1968fe34c8cf3cb834e3a9966cd2a201efc5b.1668988357.git.kai.huang@intel.com> <6d4d429a-ade2-771d-0e4c-788bef45041a@intel.com> <35aee96c1bb56322191ae442f3928d7dff064a92.camel@intel.com> <9a653cd2-70df-8c55-ac7d-5ddcb3b18b0c@intel.com> <60deb2ffe15e71bc91727aa04298c79f21a58c83.camel@intel.com> From: Dave Hansen In-Reply-To: <60deb2ffe15e71bc91727aa04298c79f21a58c83.camel@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/28/22 14:13, Huang, Kai wrote: > Apologize I am not entirely sure whether I fully got your point. Do you mean > something like below? ... No, something like this: static int init_tdx_module(void) { static struct tdsysinfo_struct tdx_sysinfo; /* too rotund for the stack */ ... tdx_get_sysinfo(&tdx_sysinfo, ...); ... But, also, seriously, 3k on the stack is *fine* if you can shut up the warnings. This isn't going to be a deep call stack to begin with.