KVM: VMX: 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: NHaitao Shan <haitao.shan@intel.com>
Signed-off-by: NXudong Hao <xudong.hao@intel.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/x86/kvm/vmx.c

@@ -3039,6 +3039,8 @@ 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;