From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: RFC: userspace exception fixups To: Andy Lutomirski , Sean Christopherson CC: Andy Lutomirski , Jann Horn , "Linus Torvalds" , Rich Felker , Dave Hansen , Jethro Beekman , Jarkko Sakkinen , Florian Weimer , Linux API , X86 ML , linux-arch , LKML , Peter Zijlstra , , , "Ayoun, Serge" , , , Andy Shevchenko , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "Carlos O'Donell" , References: <20181102163034.GB7393@linux.intel.com> <7050972d-a874-dc08-3214-93e81181da60@intel.com> <20181102170627.GD7393@linux.intel.com> <20181102173350.GF7393@linux.intel.com> <20181102182712.GG7393@linux.intel.com> <20181102220437.GI7393@linux.intel.com> <1541518670.7839.31.camel@intel.com> <1541524750.7839.51.camel@intel.com> <22596E35-F5D1-4935-86AB-B510DCA0FABE@amacapital.net> From: Dave Hansen Message-ID: Date: Tue, 6 Nov 2018 10:41:04 -0800 In-Reply-To: <22596E35-F5D1-4935-86AB-B510DCA0FABE@amacapital.net> Content-Type: text/plain; charset="utf-8" Return-Path: dave.hansen@intel.com MIME-Version: 1.0 List-ID: On 11/6/18 10:20 AM, Andy Lutomirski wrote: > I almost feel like the right solution is to call into SGX on its own > private stack or maybe even its own private address space. Yeah, I had the same gut feeling. Couldn't the debugger even treat the enclave like its own "thread" with its own stack and its own set of registers and context? That seems like a much more workable model than trying to weave it together with the EENTER context. 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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 99F7CC32789 for ; Tue, 6 Nov 2018 18:41:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65AB82085B for ; Tue, 6 Nov 2018 18:41:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65AB82085B 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 S1730477AbeKGEHn (ORCPT ); Tue, 6 Nov 2018 23:07:43 -0500 Received: from mga07.intel.com ([134.134.136.100]:56909 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730358AbeKGEHn (ORCPT ); Tue, 6 Nov 2018 23:07:43 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Nov 2018 10:41:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,472,1534834800"; d="scan'208";a="106393492" Received: from ray.jf.intel.com (HELO [10.7.201.133]) ([10.7.201.133]) by orsmga002.jf.intel.com with ESMTP; 06 Nov 2018 10:41:05 -0800 Subject: Re: RFC: userspace exception fixups To: Andy Lutomirski , Sean Christopherson Cc: Andy Lutomirski , Jann Horn , Linus Torvalds , Rich Felker , Dave Hansen , Jethro Beekman , 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 References: <20181102163034.GB7393@linux.intel.com> <7050972d-a874-dc08-3214-93e81181da60@intel.com> <20181102170627.GD7393@linux.intel.com> <20181102173350.GF7393@linux.intel.com> <20181102182712.GG7393@linux.intel.com> <20181102220437.GI7393@linux.intel.com> <1541518670.7839.31.camel@intel.com> <1541524750.7839.51.camel@intel.com> <22596E35-F5D1-4935-86AB-B510DCA0FABE@amacapital.net> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <22596E35-F5D1-4935-86AB-B510DCA0FABE@amacapital.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Message-ID: <20181106184104.DupWv95nWxH3UH41iSm6zi6T_84ZdRnRBugrFW2M_Q8@z> On 11/6/18 10:20 AM, Andy Lutomirski wrote: > I almost feel like the right solution is to call into SGX on its own > private stack or maybe even its own private address space. Yeah, I had the same gut feeling. Couldn't the debugger even treat the enclave like its own "thread" with its own stack and its own set of registers and context? That seems like a much more workable model than trying to weave it together with the EENTER context.