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

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Date:	Fri, 25 Jan 2008 21:53:07 +0100
From:	"Joerg Roedel" <joerg.roedel@....com>
To:	"Avi Kivity" <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
cc:	"Joerg Roedel" <joerg.roedel@....com>
Subject: [PATCH 2/8] 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@....com>
---
 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



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