KVM: Disable SMAP for guests in EPT realmode and EPT unpaging mode
SMAP is disabled if CPU is in non-paging mode in hardware. However KVM always uses paging mode to emulate guest non-paging mode with TDP. To emulate this behavior, SMAP needs to be manually disabled when guest switches to non-paging mode. Signed-off-by: Feng Wu <feng.wu@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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@ -3484,13 +3484,14 @@ static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
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hw_cr4 &= ~X86_CR4_PAE;
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hw_cr4 |= X86_CR4_PSE;
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/*
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* SMEP is disabled if CPU is in non-paging mode in
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* hardware. However KVM always uses paging mode to
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* SMEP/SMAP is disabled if CPU is in non-paging mode
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* in hardware. However KVM always uses paging mode to
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* emulate guest non-paging mode with TDP.
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* To emulate this behavior, SMEP needs to be manually
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* disabled when guest switches to non-paging mode.
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* To emulate this behavior, SMEP/SMAP needs to be
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* manually disabled when guest switches to non-paging
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* mode.
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*/
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hw_cr4 &= ~X86_CR4_SMEP;
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hw_cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP);
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} else if (!(cr4 & X86_CR4_PAE)) {
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hw_cr4 &= ~X86_CR4_PAE;
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}
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