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Wed, 12 Feb 2025 10:38:23 +0000 Message-ID: <3de12591-e935-4f3b-9d5a-d13741a7ef62@intel.com> Date: Wed, 12 Feb 2025 23:38:16 +1300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86: sgx: Don't track poisoned pages for reclaiming To: Dave Hansen , Jarkko Sakkinen CC: Andrew Zaborowski , , , , Dave Hansen , Tony Luck , "Thomas Gleixner" , Borislav Petkov , Ingo Molnar , "H . Peter Anvin" , References: <20250211150150.519006-1-andrew.zaborowski@intel.com> <3bd497be-54d7-43b8-a392-4bf82bf64679@intel.com> <4a1c8b84-d8ee-414a-bd6d-a8633302dab4@intel.com> <7ed9b288-69a2-446c-9f7f-50ef6bc56673@intel.com> Content-Language: en-US From: "Huang, Kai" In-Reply-To: <7ed9b288-69a2-446c-9f7f-50ef6bc56673@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4P221CA0006.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::11) To BL1PR11MB5978.namprd11.prod.outlook.com (2603:10b6:208:385::18) Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL1PR11MB5978:EE_|PH8PR11MB7144:EE_ X-MS-Office365-Filtering-Correlation-Id: 71defa31-84d2-428f-4b53-08dd4b515fd8 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014; 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Both what "ETRACK, EBLOCK and EWB" are in the first place, >>>> how they are involved in reclaim and also why EREMOVE doesn't lead to >>>> the same fate. >>> >>> Does it? [I'll dig up Intel SDM to check this] >>> >> I just did. 🙂 >> >> It seems EREMOVE only reads and updates the EPCM entry for the target >> EPC page but won't actually access that EPC page. > > Actually, now that I think about it even more, why would ETRACK or > EBLOCK access the page itself? They seem superficially like they'd be > metadata-only too. Looking at the pseudo code, AFAICT EBLOCK doesn't touch the EPC page either, but ETRACK actually reads SECS (ETRACK must take SECS page as input): (* All processors must have completed the previous tracking cycle*) IF ( (DS:RCX).TRACKING ≠ 0) ) ...... Here the DS:RCX is the SECS page. I think this also is consistent with what Andrew said: "I haven't seen a crash in either of these (always in EWB), ..." because a poisoned EPC page being regular enclave page has much higher possibility. In fact, ETRACK only takes SECS page but I think the chance that the kernel code can still reach ETRACK while SECS page is poisoned should be just 0.