From patchwork Wed Jan 27 08:30:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huaitong Han X-Patchwork-Id: 8131081 Return-Path: X-Original-To: patchwork-xen-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4275BBEEE5 for ; Wed, 27 Jan 2016 08:33:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7A6A720320 for ; Wed, 27 Jan 2016 08:33:09 +0000 (UTC) Received: from lists.xen.org (lists.xenproject.org [50.57.142.19]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5184720306 for ; Wed, 27 Jan 2016 08:33:08 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xen.org) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aOLUn-0001Ak-La; Wed, 27 Jan 2016 08:30:33 +0000 Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aOLUm-0001AV-BA for xen-devel@lists.xen.org; Wed, 27 Jan 2016 08:30:32 +0000 Received: from [85.158.137.68] by server-4.bemta-3.messagelabs.com id 1C/A4-12072-72088A65; Wed, 27 Jan 2016 08:30:31 +0000 X-Env-Sender: huaitong.han@intel.com X-Msg-Ref: server-10.tower-31.messagelabs.com!1453883428!18368651!2 X-Originating-IP: [134.134.136.24] X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor: VHJ1c3RlZCBJUDogMTM0LjEzNC4xMzYuMjQgPT4gMzkwOTcx\n X-StarScan-Received: X-StarScan-Version: 7.35.1; banners=-,-,- X-VirusChecked: Checked Received: (qmail 57045 invoked from network); 27 Jan 2016 08:30:30 -0000 Received: from mga09.intel.com (HELO mga09.intel.com) (134.134.136.24) by server-10.tower-31.messagelabs.com with SMTP; 27 Jan 2016 08:30:30 -0000 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP; 27 Jan 2016 00:30:30 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,354,1449561600"; d="scan'208";a="890082862" Received: from huaitong-desk.bj.intel.com ([10.238.135.217]) by fmsmga001.fm.intel.com with ESMTP; 27 Jan 2016 00:30:28 -0800 From: Huaitong Han To: jbeulich@suse.com, andrew.cooper3@citrix.com, george.dunlap@eu.citrix.com, tim@xen.org, keir@xen.org Date: Wed, 27 Jan 2016 16:30:26 +0800 Message-Id: <1453883430-9098-2-git-send-email-huaitong.han@intel.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1453883430-9098-1-git-send-email-huaitong.han@intel.com> References: <1453883430-9098-1-git-send-email-huaitong.han@intel.com> Cc: Huaitong Han , xen-devel@lists.xen.org Subject: [Xen-devel] [PATCH V7 1/5] x86/hvm: pkeys, disable pkeys for guests in non-paging mode X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Changes in v7: no changes. ---- This patch disables pkeys for guest in non-paging mode, However XEN always uses paging mode to emulate guest non-paging mode, To emulate this behavior, pkeys needs to be manually disabled when guest switches to non-paging mode. Signed-off-by: Huaitong Han Reviewed-by: Andrew Cooper --- xen/arch/x86/hvm/vmx/vmx.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index 04dde83..a0d51cb 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -1368,12 +1368,13 @@ static void vmx_update_guest_cr(struct vcpu *v, unsigned int cr) if ( !hvm_paging_enabled(v) ) { /* - * SMEP/SMAP is disabled if CPU is in non-paging mode in hardware. - * However Xen always uses paging mode to emulate guest non-paging - * mode. To emulate this behavior, SMEP/SMAP needs to be manually - * disabled when guest VCPU is in non-paging mode. + * SMEP/SMAP/PKU is disabled if CPU is in non-paging mode in + * hardware. However Xen always uses paging mode to emulate guest + * non-paging mode. To emulate this behavior, SMEP/SMAP/PKU needs + * to be manually disabled when guest VCPU is in non-paging mode. */ - v->arch.hvm_vcpu.hw_cr[4] &= ~(X86_CR4_SMEP | X86_CR4_SMAP); + v->arch.hvm_vcpu.hw_cr[4] &= + ~(X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE); } __vmwrite(GUEST_CR4, v->arch.hvm_vcpu.hw_cr[4]); break;