From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758672AbYBGMsh (ORCPT ); Thu, 7 Feb 2008 07:48:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755717AbYBGMsZ (ORCPT ); Thu, 7 Feb 2008 07:48:25 -0500 Received: from outbound-wa4.frontbridge.com ([216.32.181.16]:1580 "EHLO outbound3-wa4-R.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754720AbYBGMsY (ORCPT ); Thu, 7 Feb 2008 07:48:24 -0500 X-BigFish: VP X-MS-Exchange-Organization-Antispam-Report: OrigIP: 139.95.251.8;Service: EHS X-Server-Uuid: C391E81C-6590-4A2B-9214-A04D45AF4E95 From: "Joerg Roedel" To: "Avi Kivity" cc: kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, "Joerg Roedel" Subject: [PATCH 3/8] SVM: add module parameter to disable Nested Paging Date: Thu, 7 Feb 2008 13:47:40 +0100 Message-ID: <1202388465-8657-4-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1202388465-8657-1-git-send-email-joerg.roedel@amd.com> References: <1202388465-8657-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 07 Feb 2008 12:47:45.0720 (UTC) FILETIME=[A30E8B80:01C86987] MIME-Version: 1.0 X-WSS-ID: 6BB421852IW10730680-02-01 Content-Type: text/plain Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To disable the use of the Nested Paging feature even if it is available in hardware this patch adds a module parameter. Nested Paging can be disabled by passing npt=0 to the kvm_amd module. Signed-off-by: Joerg Roedel --- arch/x86/kvm/svm.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index b037b27..8173ba6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -48,6 +48,9 @@ MODULE_LICENSE("GPL"); #define SVM_DEATURE_SVML (1 << 2) static bool npt_enabled = false; +static int npt = 1; + +module_param(npt, int, S_IRUGO); static void kvm_reput_irq(struct vcpu_svm *svm); @@ -415,6 +418,11 @@ static __init int svm_hardware_setup(void) if (!svm_has(SVM_FEATURE_NPT)) npt_enabled = false; + if (npt_enabled && !npt) { + printk(KERN_INFO "kvm: Nested Paging disabled\n"); + npt_enabled = false; + } + if (npt_enabled) printk(KERN_INFO "kvm: Nested Paging enabled\n"); -- 1.5.3.7