[PATCH 2/8] SVM: add detection of Nested Paging feature

Joerg Roedel
2008-01-25T20:53:07Z

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-5C7GfCeVMHo@public.gmane.org>
---
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 0c58527..49bb57a 100644
--- 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)
@@ -410,6 +412,12 @@ 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:
--
1.5.3.7