linux-kernel - [PATCH 21/22] KVM: SVM: Report Nested Paging support to userspace

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Date:	Tue, 27 Apr 2010 12:38:31 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 21/22] 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 |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 266b1d4..6d6b300 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3233,7 +3233,12 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 		entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
 				   ASID emulation to nested SVM */
 		entry->ecx = 0; /* Reserved */
-		entry->edx = 0; /* Do not support any additional features */
+		entry->edx = 0; /* Per default do not support any
+				   additional features */
+
+		/* Support NPT for the guest if enabled */
+		if (npt_enabled)
+			entry->edx = SVM_FEATURE_NPT;
 
 		break;
 	}
-- 
1.7.0.4


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