linux-kernel - [PATCH v3 3/4] Enable EPT A/D bits if supported by turning on relevant bit in EPTP.

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Date:	Mon, 28 May 2012 19:33:36 +0800
From:	Xudong Hao <xudong.hao@...el.com>
To:	avi@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	mtosatti@...hat.com, xiantao.zhang@...el.com,
	Xudong Hao <xudong.hao@...el.com>,
	Haitao Shan <haitao.shan@...el.com>
Subject: [PATCH v3 3/4] Enable EPT A/D bits if supported by turning on relevant bit in EPTP.

In EPT page structure entry, Enable EPT A/D bits if processor supported.

Signed-off-by: Haitao Shan <haitao.shan@...el.com>
Signed-off-by: Xudong Hao <xudong.hao@...el.com>
---
 arch/x86/kvm/vmx.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 811a61e..89151a9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3005,6 +3005,8 @@ static u64 construct_eptp(unsigned long root_hpa)
 	/* TODO write the value reading from MSR */
 	eptp = VMX_EPT_DEFAULT_MT |
 		VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
+	if (enable_ept_ad_bits)
+		eptp |= VMX_EPT_AD_ENABLE_BIT;
 	eptp |= (root_hpa & PAGE_MASK);
 
 	return eptp;
-- 
1.7.1

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