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charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2018-11-07 02:17, Andy Lutomirski wrote: > On Tue, Nov 6, 2018 at 4:02 PM Sean Christopherson > wrote: >> >> /* >> * EEXIT or EENTER faulted. In the latter case, %RAX already holds s= ome >> * fault indicator, e.g. -EFAULT. >> */ >> eexit_or_eenter_fault: >> ret >=20 > But userspace wants to know whether it was a fault or not. So I think > we either need two landing pads or we need to hijack a flag bit (are > there any known-zeroed flag bits after EEXIT?) to say whether it was a > fault. And, if it was a fault, we should give the vector, the > sanitized error code, and possibly CR2. On AEX, %rax will contain ENCLU_LEAF_ERESUME (0x3). On EEXIT, %rax will=20 contain ENCLU_LEAF_EEXIT (0x4). -- Jethro Beekman | Fortanix --------------ms060801080805010704030402 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 Xwj8hcweJCzOnjILKHIoWlOQ0b9yIbFLIWBRt/9zdxlE5ZabDVHnkIyhcVgtU/BA73e78Wx2 LOObdg0wfs9U2CVRYhz2EPHFjGvkYKihItt69ye91hj1w7RKCrYC8KZGSZ/+sbkJzQdXVy32 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