From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 2 Nov 2018 09:52:04 -0700 From: Sean Christopherson To: Jethro Beekman CC: Andy Lutomirski , Linus Torvalds , Rich Felker , Jann Horn , Dave Hansen , "Jarkko Sakkinen" , Florian Weimer , Linux API , X86 ML , linux-arch , LKML , Peter Zijlstra , "nhorman@redhat.com" , "npmccallum@redhat.com" , "Ayoun, Serge" , "shay.katz-zamir@intel.com" , "linux-sgx@vger.kernel.org" , Andy Shevchenko , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "Carlos O'Donell" , "adhemerval.zanella@linaro.org" Subject: Re: RFC: userspace exception fixups Message-ID: <20181102165204.GC7393@linux.intel.com> References: <20181101185225.GC5150@brightrain.aerifal.cx> <20181101193107.GE5150@brightrain.aerifal.cx> <20181102163034.GB7393@linux.intel.com> <7e14ee0e-ce15-1e88-7ae9-4d0f40cb3d84@fortanix.com> Content-Type: text/plain; charset="us-ascii" In-Reply-To: <7e14ee0e-ce15-1e88-7ae9-4d0f40cb3d84@fortanix.com> Sender: Return-Path: linux-kernel-owner@vger.kernel.org MIME-Version: 1.0 List-ID: On Fri, Nov 02, 2018 at 04:37:10PM +0000, Jethro Beekman wrote: > On 2018-11-02 09:30, Sean Christopherson wrote: > >... The intended convention for EENTER is to have an ENCLU at the AEX target ... > > > >... to further enforce that the AEX target needs to be ENCLU. > > Some SGX runtimes may want to use a different AEX target. To what end? Userspace gets no indication as to why the AEX occurred. And if exceptions are getting transfered to userspace the trampoline would effectively be handling only INTR, NMI, #MC and EPC #PF. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E470C32789 for ; Fri, 2 Nov 2018 16:52:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1A0D92081B for ; Fri, 2 Nov 2018 16:52:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A0D92081B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-sgx-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728138AbeKCB7w (ORCPT ); Fri, 2 Nov 2018 21:59:52 -0400 Received: from mga09.intel.com ([134.134.136.24]:4129 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726318AbeKCB7w (ORCPT ); Fri, 2 Nov 2018 21:59:52 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Nov 2018 09:52:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,456,1534834800"; d="scan'208";a="276633999" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.193]) by fmsmga005.fm.intel.com with ESMTP; 02 Nov 2018 09:52:03 -0700 Date: Fri, 2 Nov 2018 09:52:04 -0700 From: Sean Christopherson To: Jethro Beekman Cc: Andy Lutomirski , Linus Torvalds , Rich Felker , Jann Horn , Dave Hansen , Jarkko Sakkinen , Florian Weimer , Linux API , X86 ML , linux-arch , LKML , Peter Zijlstra , "nhorman@redhat.com" , "npmccallum@redhat.com" , "Ayoun, Serge" , "shay.katz-zamir@intel.com" , "linux-sgx@vger.kernel.org" , Andy Shevchenko , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Carlos O'Donell , "adhemerval.zanella@linaro.org" Subject: Re: RFC: userspace exception fixups Message-ID: <20181102165204.GC7393@linux.intel.com> References: <20181101185225.GC5150@brightrain.aerifal.cx> <20181101193107.GE5150@brightrain.aerifal.cx> <20181102163034.GB7393@linux.intel.com> <7e14ee0e-ce15-1e88-7ae9-4d0f40cb3d84@fortanix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7e14ee0e-ce15-1e88-7ae9-4d0f40cb3d84@fortanix.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Message-ID: <20181102165204.sDUd10tHRSqrHVAshBtckN2JHbzqqYXFPAy4mnPG3JA@z> On Fri, Nov 02, 2018 at 04:37:10PM +0000, Jethro Beekman wrote: > On 2018-11-02 09:30, Sean Christopherson wrote: > >... The intended convention for EENTER is to have an ENCLU at the AEX target ... > > > >... to further enforce that the AEX target needs to be ENCLU. > > Some SGX runtimes may want to use a different AEX target. To what end? Userspace gets no indication as to why the AEX occurred. And if exceptions are getting transfered to userspace the trampoline would effectively be handling only INTR, NMI, #MC and EPC #PF.