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Peter Anvin" , linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org References: <9688abee-6ba7-e1d9-701e-a5cabac36269@fortanix.com> <0498080e-6fdc-ed6d-8efa-d9c3265fe7e5@intel.com> <9d15aae0-078a-ed72-6c14-155cd1bf27c5@fortanix.com> <247ffbee-0ef6-1b6f-75aa-2dc06df42d5d@intel.com> <4a122198-054f-609e-e96c-b69ff941c8a7@intel.com> From: Jethro Beekman Message-ID: <9a841584-65e8-31e9-6bd4-0140b33434e8@fortanix.com> Date: Fri, 2 Apr 2021 20:31:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <4a122198-054f-609e-e96c-b69ff941c8a7@intel.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms020300010607090309040003" X-Originating-IP: [213.127.124.30] X-ClientProxiedBy: AM0PR02CA0185.eurprd02.prod.outlook.com (2603:10a6:20b:28e::22) To BY5PR11MB4260.namprd11.prod.outlook.com (2603:10b6:a03:1ba::30) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.4.219] (213.127.124.30) by AM0PR02CA0185.eurprd02.prod.outlook.com (2603:10a6:20b:28e::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3999.26 via Frontend Transport; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2021-04-02 17:53, Dave Hansen wrote: > On 4/2/21 1:38 AM, Jethro Beekman wrote: >>> So, we're talking here about pages that have been EEADDED, but for >>> which we do not want to include the entire contents of the page? >>> Do these contents always include the beginning of the page, or can >>> the holes be anywhere? >> Holes can be anywhere, and EEXTEND calls need not be sequential in >> memory address or even relate to the most recently EADDed page. >=20 > I think you're referring to the SGX architecture itself here. The > architecture permits this, right? Yes. > But, why would an enclave loader application ever do this?=20 e.g. to save space > Is this something we want to support in Linux? Why not? Is there a good reason to not fully support this part of the CPU= architecture? -- Jethro Beekman | Fortanix --------------ms020300010607090309040003 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC DVUwggXgMIIDyKADAgECAhBukmvE8GLB9+EYd88699DiMA0GCSqGSIb3DQEBCwUAMIGBMQsw CQYDVQQGEwJJVDEQMA4GA1UECAwHQmVyZ2FtbzEZMBcGA1UEBwwQUG9udGUgU2FuIFBpZXRy bzEXMBUGA1UECgwOQWN0YWxpcyBTLnAuQS4xLDAqBgNVBAMMI0FjdGFsaXMgQ2xpZW50IEF1 dGhlbnRpY2F0aW9uIENBIEczMB4XDTIwMDkxNjE2MDk1NloXDTIxMDkxNjE2MDk1NlowHjEc MBoGA1UEAwwTamV0aHJvQGZvcnRhbml4LmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBAOM9pWqcukwLqKxwz61HtRU+YK4w6EwrvjLtFeWi0T2qXSpA9ePS2c2PB2rCoqR6 VZehtzjp1FvE1X1Mry5j9Qb529a+wuhxrCH/ecULCOX3x1eGaYFIUbehmpztnvNkGowLCDWq 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