From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751827AbeADInK (ORCPT + 1 other); Thu, 4 Jan 2018 03:43:10 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:54338 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750791AbeADInJ (ORCPT ); Thu, 4 Jan 2018 03:43:09 -0500 Message-ID: <1515055371.12987.83.camel@infradead.org> Subject: Re: [PATCH v2 03/12] x86/retpoline/entry: Convert entry assembler indirect jumps From: David Woodhouse To: Andi Kleen , tglx@linutronix.de Cc: torvalds@linux-foundation.org, gregkh@linux-foundation.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, Andi Kleen In-Reply-To: <20180104020019.1173-4-andi@firstfloor.org> References: <20180104020019.1173-1-andi@firstfloor.org> <20180104020019.1173-4-andi@firstfloor.org> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-ExfNkSYSzmRM+HRMmqX2" Date: Thu, 04 Jan 2018 08:42:51 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-ExfNkSYSzmRM+HRMmqX2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-03 at 18:00 -0800, Andi Kleen wrote: > @@ -269,8 +270,9 @@ entry_SYSCALL_64_fastpath: > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * This call instruction = is handled specially in stub_ptregs_64. > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * It might end up jumpin= g to the slow path.=C2=A0 If it jumps, RAX > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * and all argument regis= ters are clobbered. > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0call=C2=A0=C2=A0=C2=A0=C2=A0*s= ys_call_table(, %rax, 8) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*/ > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0=C2=A0sy= s_call_table(, %rax, 8), %rax > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0NOSPEC_CALL=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0%rax > =C2=A0.Lentry_SYSCALL_64_after_fastpath_call: > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0movq=C2=A0=C2=A0=C2=A0=C2= =A0%rax, RAX(%rsp) Now I *know* you're working from an older version of my patches and haven't just deliberately reverted the CET support (and alternatives?). I fixed that mis-indentation of the closing */ and Intel were even shipping that version in the latest pre-embargo patch tarball. Should I post a new series and call it 'v3'? Was there anything specific you changed other than the cosmetics like s/CALL_THUNK/NOSPEC_CALL/ ? And obviously the fact that it stands alone instead of being based on the IBRS microcode support? --=-ExfNkSYSzmRM+HRMmqX2 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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