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

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Message-ID: <20120516011029.GD14256@hp-xd.sh.intel.com>
Date:	Wed, 16 May 2012 09:10:29 +0800
From:	Xudong Hao <xudong.hao@...ux.intel.com>
To:	avi@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	haitao.shan@...el.com, xiantao.zhang@...el.com,
	xudong.hao@...el.com
Subject: [PATCH 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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