KVM: SVM: add detection of Nested Paging feature

Let SVM detect if the Nested Paging feature is available on the hardware.
Disable it to keep this patch series bisectable.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 5f527dc0e1629a4e76cfb4ff2dbaa00bc15820a9..c12a75953b5bf4cfdd17f1f6d071fd07518018a3 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -47,6 +47,8 @@ MODULE_LICENSE("GPL");
 #define SVM_FEATURE_LBRV (1 << 1)
 #define SVM_DEATURE_SVML (1 << 2)
 
+static bool npt_enabled = false;
+
 static void kvm_reput_irq(struct vcpu_svm *svm);
 
 static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
@@ -413,6 +415,12 @@ static __init int svm_hardware_setup(void)
 
        svm_features = cpuid_edx(SVM_CPUID_FUNC);
 
+       if (!svm_has(SVM_FEATURE_NPT))
+               npt_enabled = false;
+
+       if (npt_enabled)
+               printk(KERN_INFO "kvm: Nested Paging enabled\n");
+
        return 0;
 
 err_2: