Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757166AbYAYUyZ (ORCPT ); Fri, 25 Jan 2008 15:54:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753765AbYAYUyQ (ORCPT ); Fri, 25 Jan 2008 15:54:16 -0500 Received: from outbound-va3.frontbridge.com ([216.32.180.16]:47146 "EHLO outbound2-va3-R.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753636AbYAYUyP (ORCPT ); Fri, 25 Jan 2008 15:54:15 -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" , kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org cc: "Joerg Roedel" Subject: [PATCH 3/8] SVM: add module parameter to disable Nested Paging Date: Fri, 25 Jan 2008 21:53:08 +0100 Message-ID: <1201294393-22613-4-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1201294393-22613-1-git-send-email-joerg.roedel@amd.com> References: <1201294393-22613-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 25 Jan 2008 20:53:14.0583 (UTC) FILETIME=[4DD78E70:01C85F94] MIME-Version: 1.0 X-WSS-ID: 6B8493E02IW8829122-01-01 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 Content-Length: 1291 Lines: 45 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=off 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 49bb57a..2e718ff 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 char *npt = "on"; + +module_param(npt, charp, 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 && strncmp(npt, "off", 3) == 0) { + 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/