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X-IronPort-AV: E=McAfee;i="6600,9927,10734"; a="337660975" X-IronPort-AV: E=Sophos;i="6.00,226,1681196400"; d="scan'208";a="337660975" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2023 06:13:12 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10734"; a="854337488" X-IronPort-AV: E=Sophos;i="6.00,226,1681196400"; d="scan'208";a="854337488" Received: from swalker-mobl1.amr.corp.intel.com (HELO [10.209.22.184]) ([10.209.22.184]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2023 06:13:10 -0700 Message-ID: Date: Thu, 8 Jun 2023 06:13:10 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH v11 08/20] x86/virt/tdx: Get information about TDX module and TDX-capable memory Content-Language: en-US To: "kirill.shutemov@linux.intel.com" , "Huang, Kai" Cc: "kvm@vger.kernel.org" , "david@redhat.com" , "bagasdotme@gmail.com" , "ak@linux.intel.com" , "Wysocki, Rafael J" , "linux-kernel@vger.kernel.org" , "Chatre, Reinette" , "Christopherson,, Sean" , "pbonzini@redhat.com" , "tglx@linutronix.de" , "linux-mm@kvack.org" , "Yamahata, Isaku" , "Luck, Tony" , "peterz@infradead.org" , "Shahar, Sagi" , "imammedo@redhat.com" , "Gao, Chao" , "Brown, Len" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "Huang, Ying" , "Williams, Dan J" References: <50386eddbb8046b0b222d385e56e8115ed566526.1685887183.git.kai.huang@intel.com> <20230608002725.xc25dantcwdxsuil@box.shutemov.name> <19ea7470e9d6fa698f9ad7caff3279873e530a0b.camel@intel.com> <20230608114128.vu75wlcojpyjak22@box.shutemov.name> From: Dave Hansen In-Reply-To: <20230608114128.vu75wlcojpyjak22@box.shutemov.name> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: 31rfsfx1mx6xxxf3iot9rszzj64ofmia X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E432E40016 X-Rspam-User: X-HE-Tag: 1686230135-671622 X-HE-Meta: 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 t1B2NdJs T0a1+5Upev9Lt6eJ96bAEahUgguE7t2fhSCkA+8pQHH1vBFxL/7xjbL428RuVq80/SkgT8RVdHAq206hAldp0j0gszysohasyeOLOhTvBHeN6BkcxeiEkzK6iiFgKIE3a83yc8HvpRuijyjBBxD/R+cnXNnzHKIlNPbHQA1HXMUBMQ38i655c7nGk833ghFGLoqff3UwtkdZcUTLVl4GGt3X4Xg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/8/23 04:41, kirill.shutemov@linux.intel.com wrote: > These structures take 1.5K of memory and the memory will be allocated for > all machines that boots the kernel with TDX enabled, regardless if the > machine has TDX or not. It seems very wasteful to me. Actually, those variables are in .bss. They're allocated forever for anyone that runs a kernel that has TDX support.