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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C6700C04EB8 for ; Thu, 6 Dec 2018 22:19:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 914032082B for ; Thu, 6 Dec 2018 22:19:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 914032082B 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-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726118AbeLFWT3 (ORCPT ); Thu, 6 Dec 2018 17:19:29 -0500 Received: from mga06.intel.com ([134.134.136.31]:39981 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725939AbeLFWT2 (ORCPT ); Thu, 6 Dec 2018 17:19:28 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Dec 2018 14:19:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,324,1539673200"; d="scan'208";a="99313296" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.154]) by orsmga008.jf.intel.com with ESMTP; 06 Dec 2018 14:19:28 -0800 From: Sean Christopherson To: Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Dave Hansen , Peter Zijlstra Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, Andy Lutomirski , Jarkko Sakkinen , Josh Triplett Subject: [RFC PATCH v2 0/4] x86: Add vDSO exception fixup for SGX Date: Thu, 6 Dec 2018 14:19:18 -0800 Message-Id: <20181206221922.31012-1-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This version is almost entirely about the vDSO function itself, i.e. patch 4/4. Feel free to ignore patches 2/4 and 3/4, I need to do (a lot) more legwork to address feedback and improve their changelogs. I'm expecting that to take a fair amount of time and wanted to get the alternative exit handler idea out there ASAP. The new vDSO function builds but is otherwise completely untested. v2: - For all intents and purposes, rewrite the SGX vDSO function. This version is quite a bit different than anything discussed in the past. Rather than provide separate a separate function or an explicit parameter to request ERESUME, e.g. to recover after a fault, take an optional "exit handler" that provides the caller the opportunity to specify if and how the enclave should be resumed. More details in the changelog. - Rename it to __vdso_sgx_enter_enclave() to abstract the details of EENTER and ERESUME to some degree. - Give the enclave RDI, RSI and RDX to pass data out of the enclave. - Call fixup_vdso_exception() in do_int3(). v1: https://lkml.kernel.org/r/20181205232012.28920-1-sean.j.christopherson@intel.com Sean Christopherson (4): x86/vdso: Add support for exception fixup in vDSO functions x86/fault: Attempt to fixup unhandled #PF in vDSO before signaling x86/traps: Attempt to fixup exceptions in vDSO before signaling x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions arch/x86/entry/vdso/Makefile | 5 +- arch/x86/entry/vdso/extable.c | 37 +++++++ arch/x86/entry/vdso/extable.h | 17 ++++ arch/x86/entry/vdso/vdso-layout.lds.S | 9 +- arch/x86/entry/vdso/vdso.lds.S | 1 + arch/x86/entry/vdso/vdso2c.h | 58 +++++++++-- arch/x86/entry/vdso/vsgx_enter_enclave.c | 119 +++++++++++++++++++++++ arch/x86/include/asm/vdso.h | 5 + arch/x86/kernel/traps.c | 15 +++ arch/x86/mm/fault.c | 7 ++ 10 files changed, 262 insertions(+), 11 deletions(-) create mode 100644 arch/x86/entry/vdso/extable.c create mode 100644 arch/x86/entry/vdso/extable.h create mode 100644 arch/x86/entry/vdso/vsgx_enter_enclave.c -- 2.19.2