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Wed, 7 Aug 2019 16:45:22 +0000 From: Jethro Beekman To: Jarkko Sakkinen , "Ayoun, Serge" CC: "linux-kernel@vger.kernel.org" , "x86@kernel.org" , "linux-sgx@vger.kernel.org" , "akpm@linux-foundation.org" , "Hansen, Dave" , "Christopherson, Sean J" , "nhorman@redhat.com" , "npmccallum@redhat.com" , "Katz-zamir, Shay" , "Huang, Haitao" , "andriy.shevchenko@linux.intel.com" , "tglx@linutronix.de" , "Svahn, Kai" , "bp@alien8.de" , "josh@joshtriplett.org" , "luto@kernel.org" , "Huang, Kai" , "rientjes@google.com" , "Xing, Cedric" Subject: Re: [PATCH v21 16/28] x86/sgx: Add the Linux SGX Enclave Driver Thread-Topic: [PATCH v21 16/28] x86/sgx: Add the Linux SGX Enclave Driver Thread-Index: AQHVOZ3969OCNEhpdUygrX4Zp0euc6bhi0+AgA5n17qAABinAA== Date: Wed, 7 Aug 2019 16:45:22 +0000 Message-ID: <3cd0a591-8f30-93c1-41c7-4c74b6c3e5d2@fortanix.com> References: <20190713170804.2340-1-jarkko.sakkinen@linux.intel.com> <20190713170804.2340-17-jarkko.sakkinen@linux.intel.com> <88B7642769729B409B4A93D7C5E0C5E7C65ABB8D@hasmsx108.ger.corp.intel.com> <20190807151534.kxsletvhbn3lno6w@linux.intel.com> <20190807151705.su6kxgr7ou45mk3p@linux.intel.com> In-Reply-To: <20190807151705.su6kxgr7ou45mk3p@linux.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-clientproxiedby: BN6PR10CA0022.namprd10.prod.outlook.com (2603:10b6:405:1::32) To SN6PR11MB3167.namprd11.prod.outlook.com (2603:10b6:805:c4::16) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jethro@fortanix.com; 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charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable ECPM permissions are mentioned in SDM EADD instruction operation. PTE I=20 don't know. -- Jethro Beekman | Fortanix On 2019-08-07 08:17, Jarkko Sakkinen wrote: > On Wed, Aug 07, 2019 at 06:15:34PM +0300, Jarkko Sakkinen wrote: >> On Mon, Jul 29, 2019 at 11:17:57AM +0000, Ayoun, Serge wrote: >>>> + /* TCS pages need to be RW in the PTEs, but can be 0 in the EPCM. = */ >>>> + if ((secinfo.flags & SGX_SECINFO_PAGE_TYPE_MASK) =3D=3D >>>> SGX_SECINFO_TCS) >>>> + prot |=3D PROT_READ | PROT_WRITE; >>> >>> For TCS pages you add both RD and WR maximum protection bits. >>> For the enclave to be able to run, user mode will have to change the >>> "vma->vm_flags" from PROT_NONE to PROT_READ | PROT_WRITE (otherwise >>> eenter fails). This is exactly what your selftest does. >> >> Recap where the TCS requirements came from? Why does it need >> RW in PTEs and can be 0 in the EPCM? The comment should explain >> it rather leave it as a claim IMHO. >=20 > I mean after ~3 weeks of not looking into SGX (because being > on vacation etc.) I cannot remember details of this. >=20 > /Jarkko >=20 --------------ms070100070604050809040909 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 Cx8wggUxMIIEGaADAgECAhBdZC9mIseKJlmxx1xn+g00MA0GCSqGSIb3DQEBCwUAMIGXMQsw CQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxm b3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBD bGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xODA5MTUwMDAw MDBaFw0xOTA5MTUyMzU5NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2pldGhyb0Bmb3J0YW5peC5j b20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDRQDOQsroKjy2xAQCXLyqryJt4 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