KVM: VMX: Add parameter to control A/D bits support, default is on
Add kernel parameter to control A/D bits support, it's on by default. Signed-off-by: Haitao Shan <haitao.shan@intel.com> Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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1 changed files with 12 additions and 0 deletions
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@ -71,6 +71,9 @@ static bool __read_mostly enable_unrestricted_guest = 1;
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module_param_named(unrestricted_guest,
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enable_unrestricted_guest, bool, S_IRUGO);
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static bool __read_mostly enable_ept_ad_bits = 1;
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module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO);
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static bool __read_mostly emulate_invalid_guest_state = 0;
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module_param(emulate_invalid_guest_state, bool, S_IRUGO);
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@ -789,6 +792,11 @@ static inline bool cpu_has_vmx_ept_4levels(void)
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return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
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}
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static inline bool cpu_has_vmx_ept_ad_bits(void)
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{
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return vmx_capability.ept & VMX_EPT_AD_BIT;
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}
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static inline bool cpu_has_vmx_invept_individual_addr(void)
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{
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return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
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@ -2645,8 +2653,12 @@ static __init int hardware_setup(void)
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!cpu_has_vmx_ept_4levels()) {
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enable_ept = 0;
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enable_unrestricted_guest = 0;
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enable_ept_ad_bits = 0;
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}
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if (!cpu_has_vmx_ept_ad_bits())
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enable_ept_ad_bits = 0;
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if (!cpu_has_vmx_unrestricted_guest())
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enable_unrestricted_guest = 0;
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