From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759464AbYCaOqR (ORCPT ); Mon, 31 Mar 2008 10:46:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753241AbYCaOhq (ORCPT ); Mon, 31 Mar 2008 10:37:46 -0400 Received: from bzq-179-150-194.static.bezeqint.net ([212.179.150.194]:51323 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751548AbYCaOhe (ORCPT ); Mon, 31 Mar 2008 10:37:34 -0400 From: Avi Kivity To: kvm-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH 22/40] KVM: SVM: add module parameter to disable Nested Paging Date: Mon, 31 Mar 2008 17:37:06 +0300 Message-Id: <1206974244-9716-23-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.4.5 In-Reply-To: <1206974244-9716-1-git-send-email-avi@qumranet.com> References: <1206974244-9716-1-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel 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 Signed-off-by: Avi Kivity --- 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 c12a759..fb5d6c2 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); @@ -418,6 +421,11 @@ 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"); -- 1.5.4.5