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Thu, 16 Sep 2021 15:35:38 +0000 Subject: Re: [PATCH 02/14] x86/sgx: Add /sys/kernel/debug/x86/sgx_total_mem To: Jarkko Sakkinen , , CC: , , , , References: <086aa5a16faf0d9b47ba9e0ebd2213713d0e76ff.1631731214.git.reinette.chatre@intel.com> <6f3cc681e10877e639b882eaabf1a5e21bd2fc94.camel@kernel.org> From: Reinette Chatre Message-ID: <26937e79-c7f7-ea08-a4dd-9386a44c4ff1@intel.com> Date: Thu, 16 Sep 2021 08:35:35 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.14.0 In-Reply-To: <6f3cc681e10877e639b882eaabf1a5e21bd2fc94.camel@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MWHPR1701CA0005.namprd17.prod.outlook.com (2603:10b6:301:14::15) To BN0PR11MB5744.namprd11.prod.outlook.com (2603:10b6:408:166::16) MIME-Version: 1.0 Received: from [192.168.1.221] (71.238.111.198) by MWHPR1701CA0005.namprd17.prod.outlook.com (2603:10b6:301:14::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.14 via Frontend Transport; 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SGX has its >> own reclaim mechanism which kicks in when physical SGX memory (Enclave >> Page Cache / EPC) is exhausted. That reclaim mechanism is relatively >> rarely exercised and needs selftests to poke at it. >> >> The amount of EPC on the system is determined by the BIOS and it varies >> wildly between systems. It can be dozens of MB on desktops, or many GB >> on servers. >> >> To run in a reasonable amount of time, the selftest needs to know how >> much EPC there is in the system. >> >> Introduce a new debugfs file to export that information. >> >> Acked-by: Dave Hansen >> Signed-off-by: Jarkko Sakkinen >> [reinette: Use as placeholder patch until other discussions complete] >> Signed-off-by: Reinette Chatre > > This could be replaced with the following two patches: > > https://lore.kernel.org/linux-sgx/20210914030422.377601-1-jarkko@kernel.org/T/#t > Thank you very much. I will replace this patch and update the kselftest changes to use the information from the new source. Reinette