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KVM: nVMX: Fix EPT switching advertising

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I can use vmxcap tool to observe "EPTP Switching   yes" even if EPT is not
exposed to L1.

EPT switching is advertised unconditionally since it is emulated, however,
it can be treated as an extended feature for EPT and it should not be
advertised if EPT itself is not exposed. This patch fixes it.

Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Jim Mattson <jmattson@google.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Wanpeng Li 2017-10-19 07:00:34 +08:00 committed by Radim Krčmář
parent cc3d967f7e
commit 575b3a2cb4
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/vmx.c
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@ -2842,8 +2842,9 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
* Advertise EPTP switching unconditionally
* since we emulate it
*/
vmx->nested.nested_vmx_vmfunc_controls =
VMX_VMFUNC_EPTP_SWITCHING;
if (enable_ept)
vmx->nested.nested_vmx_vmfunc_controls =
VMX_VMFUNC_EPTP_SWITCHING;
}
/*