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Thu, 27 Aug 2020 08:58:54 +0000 Subject: Re: [RFC PATCH 2/4] x86/vdso: x86/sgx: Rework __vdso_sgx_enter_enclave() API To: Sean Christopherson , "Xing, Cedric" Cc: "linux-sgx@vger.kernel.org" References: <20200818042405.12871-1-sean.j.christopherson@intel.com> <20200818042405.12871-3-sean.j.christopherson@intel.com> <2ddc5a5b-0929-b99f-41a0-06b3b53fcc8f@intel.com> <20200826201511.GB21459@sjchrist-ice> From: Jethro Beekman Message-ID: <18cacc82-af81-d00a-0542-d859bb116f5b@fortanix.com> Date: Thu, 27 Aug 2020 10:58:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200826201511.GB21459@sjchrist-ice> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms070507000502000404020305" X-ClientProxiedBy: AM4PR07CA0032.eurprd07.prod.outlook.com (2603:10a6:205:1::45) To BY5PR11MB4260.namprd11.prod.outlook.com (2603:10b6:a03:1ba::30) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by AM4PR07CA0032.eurprd07.prod.outlook.com (2603:10a6:205:1::45) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3326.10 via Frontend Transport; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020-08-26 22:15, Sean Christopherson wrote: > On Wed, Aug 26, 2020 at 12:27:54PM -0700, Xing, Cedric wrote: >> On 8/17/2020 9:24 PM, Sean Christopherson wrote: >>> Rework __vdso_sgx_enter_enclave() to use a struct to hold the input a= nd >>> output params. In the new struct, add an opaque "user_data" that can= be >>> used to pass context across the vDSO, and an explicit "exit_reason" t= o >>> avoid overloading the return value. >>> In order to pass additional parameters to the exit handler, the exinf= o >> structure could be embedded in a user-defined structure while the hand= ler >> could pick it up using "container_of" macro. IMO the original interfac= e was >> neat and suffcient, and we are over-engineering it. >=20 > container_of/offsetof shenanigans were my original suggestion as well. > Nathaniel's argument is that using such tricks is less than pleasent in= a > Rust environment. >=20 > https://lkml.kernel.org/r/CAOASepOFh-vOrNZEVDFrDSuHs+9GEzzpXUTG-fZMuyjW= AkpRWw@mail.gmail.com Just for the record I'm a Rust user and I have nothing against a solution= that requires computing field offsets. As others have mentioned, assembl= y doesn't have facilities for this but it hasn't been a problem there. -- Jethro Beekman | Fortanix --------------ms070507000502000404020305 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 C54wggVPMIIEN6ADAgECAhAFFr+cC0ZYZTtbKgQCBwyyMA0GCSqGSIb3DQEBCwUAMIGCMQsw CQYDVQQGEwJJVDEPMA0GA1UECAwGTWlsYW5vMQ8wDQYDVQQHDAZNaWxhbm8xIzAhBgNVBAoM GkFjdGFsaXMgUy5wLkEuLzAzMzU4NTIwOTY3MSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBB dXRoZW50aWNhdGlvbiBDQSBHMTAeFw0xOTA5MTYwOTQ3MDlaFw0yMDA5MTYwOTQ3MDlaMB4x HDAaBgNVBAMME2pldGhyb0Bmb3J0YW5peC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw ggEKAoIBAQDHWEhcRGkEl1ZnImSqBt/OXNJ4AyDZ86CejuWI9jYpWbtf/gXBQO6iaaEKBDlj Vffk2QxH9wcifkYsvCYfxFgD15dU9TABO7YOwvHa8NtxanWr1xomufu/P1ApI336+S7ZXfSe 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