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Tue, 11 Aug 2020 07:16:39 +0000 Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call To: Sean Christopherson , Nathaniel McCallum Cc: Jarkko Sakkinen , x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Lutomirski , Cedric Xing , akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, asapek@google.com, bp@alien8.de, chenalexchen@google.com, conradparker@google.com, cyhanish@google.com, dave.hansen@intel.com, "Huang, Haitao" , Josh Triplett , kai.huang@intel.com, "Svahn, Kai" , kmoy@google.com, ludloff@google.com, luto@kernel.org, Neil Horman , Patrick Uiterwijk , David Rientjes , Thomas Gleixner , yaozhangx@google.com References: <20200716135303.276442-1-jarkko.sakkinen@linux.intel.com> <20200716135303.276442-22-jarkko.sakkinen@linux.intel.com> <20200810222317.GG14724@linux.intel.com> From: Jethro Beekman Message-ID: <78ba0baf-8ffa-7221-4ac1-007dd9e7eb20@fortanix.com> Date: Tue, 11 Aug 2020 09:16:28 +0200 User-Agent: Mozilla/5.0 (X11; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2020-08-11 00:23, Sean Christopherson wrote: > Another thought would be to wrap sgx_enclave_exception in a struct to g= ive > room for supporting additional exit information (if such a thing ever p= ops > up) and to allow the caller to opt in to select behavior, e.g. Jethro's= > request to invoke the exit handler on IRQ exits. This is basically the= > equivalent of "struct kvm_run", minus the vCPU/enclave state. Actually, the flag I need is =E2=80=9Creturn from the vdso on IRQ exits=E2= =80=9D (See Andy's email about preferring returns over callbacks). But ma= ybe the flag should be =E2=80=9Cinterpret IRQ exit as a normal exit=E2=80= =9D and let it be handled the same as any other exit based on whether an = exit handler fnptr was passed or not. -- Jethro Beekman | Fortanix --------------ms060609020707000509080703 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 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