From 6c7dac72d5c7dc0e09512dce865398167be9a8f7 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 7 Feb 2008 13:47:40 +0100 Subject: KVM: SVM: add module parameter to disable Nested Paging 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 file changed, 8 insertions(+) (limited to 'arch') diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c12a75953b5b..fb5d6c2e6a08 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"); -- cgit v1.2.3