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KVM: SVM: add module parameter to disable Nested Paging

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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 <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Joerg Roedel 2008-02-07 13:47:40 +01:00 committed by Avi Kivity
parent e3da3acdb3
commit 6c7dac72d5
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/svm.c
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@ -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");