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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 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669673994; a=rsa-sha256; cv=none; b=abLGRsfTjIfbxtArCjNqPeDfhjyotnHOGKJLugZYalOJQlfdNFaAZ50eQqIyzafsGWbsO3 9BJnNDrgVqiDbOUQ0t4QPM8tINtQMXX/NcuKUYGlfKWs6lJOqgXwgN+f0urcfvo4uaERpZ R2FwHcfK2ODxsaVZdmuUjufdmlfpLwY= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=V5G83oDt; spf=pass (imf28.hostedemail.com: domain of dave.hansen@intel.com designates 192.55.52.88 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669673994; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=bbX2kltIbZvCHyvaNfqXxLSE7oCUm1kdjAKIBKL+nGw=; b=wiTPh604KPxE/6ESjFlyF/GAIH6aZIfyP8FajE2Pe0F06Zn3CDnEYQNHgHnUjlFrqKlUOd h3PEB8AFyt8y2/Jajo+AhB05EfRILuWrN1ry1cfwSzDcV4CP3rJuLz75kDS8DPxVzfyyp/ q6Y/1uXq/GIBd1i1Zvhhw2xfFvE9hng= X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 16195C000C X-Rspam-User: Authentication-Results: imf28.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=V5G83oDt; spf=pass (imf28.hostedemail.com: domain of dave.hansen@intel.com designates 192.55.52.88 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Stat-Signature: 73pfg5tdo8ejfxicoudzjqq5cg1rrfxw X-HE-Tag: 1669673993-826129 X-Bogosity: Ham, tests=bogofilter, spamicity=0.004519, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.