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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HK_RANDOM_FROM,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 CC37DC35247 for ; Mon, 3 Feb 2020 15:21:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9F2D2217BA for ; Mon, 3 Feb 2020 15:21:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728119AbgBCPVS (ORCPT ); Mon, 3 Feb 2020 10:21:18 -0500 Received: from mga02.intel.com ([134.134.136.20]:32939 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726272AbgBCPVR (ORCPT ); Mon, 3 Feb 2020 10:21:17 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Feb 2020 07:21:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,398,1574150400"; d="scan'208";a="429473339" Received: from lxy-dell.sh.intel.com ([10.239.13.109]) by fmsmga005.fm.intel.com with ESMTP; 03 Feb 2020 07:21:15 -0800 From: Xiaoyao Li To: Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski Cc: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, David Laight , Xiaoyao Li Subject: [PATCH v2 0/6] kvm/split_lock: Add feature split lock detection support in kvm Date: Mon, 3 Feb 2020 23:16:02 +0800 Message-Id: <20200203151608.28053-1-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.23.0 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 adds the virtualization of split lock detection for guest in patch 5 and patch 6. No matter whether we advertise split lock detection to guest, we have to make a choice between not burn the old guest and prevent DoS attack from guest since we cannot identify whether a guest is malicious. Since sld_warn mode also allows userspace applications to do split lock we can extend the similar policy to guest that if host is sld_warn, we allow guest to generate split lock by clearing MSR_TEST_CTRL.SPLIT_LOCK_DETECT bit when vcpu is running. If host is sld_fatal mode and guest doesn't set its SPLIT_LOCK_DETECT bit we forward split lock #AC to user space, similar as sending SIGBUS. Xiaoyao Li (6): x86/split_lock: Add and export get_split_lock_detect_state() x86/split_lock: Add and export split_lock_detect_set() kvm: x86: Emulate split-lock access as a write kvm: vmx: Extend VMX's #AC handding for split lock in guest kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES x86: vmx: virtualize split lock detection arch/x86/include/asm/cpu.h | 13 +++++ arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kernel/cpu/intel.c | 18 ++++-- arch/x86/kvm/cpuid.c | 5 +- arch/x86/kvm/vmx/vmx.c | 98 ++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx/vmx.h | 4 ++ arch/x86/kvm/x86.c | 44 ++++++++++++++- 7 files changed, 171 insertions(+), 12 deletions(-) -- 2.23.0