linux-kernel - [PATCH 17/18] KVM: SVM: Report Nested Paging support to userspace

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Date:	Wed, 3 Mar 2010 20:12:20 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 17/18] KVM: SVM: Report Nested Paging support to userspace

This patch implements the reporting of the nested paging
feature support to userspace.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index fe1398e..ce71023 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3289,6 +3289,16 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
 
 static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 {
+	switch (func) {
+	case 0x8000000A:
+		if (!npt_enabled)
+			break;
+
+		/* NPT feature is supported by Nested SVM */
+		entry->edx = SVM_FEATURE_NPT;
+
+		break;
+	}
 }
 
 static const struct trace_print_flags svm_exit_reasons_str[] = {
-- 
1.7.0


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