KVM: VMX: Don't expose unrestricted_guest is enabled if ept is disabled

SDM mentioned:

 "If either the “unrestricted guest†VM-execution control or the “mode-based
  execute control for EPT†VM- execution control is 1, the “enable EPTâ€
  VM-execution control must also be 1."

However, we can still observe unrestricted_guest is Y after inserting the kvm-intel.ko
w/ ept=N. It depends on later starts a guest in order that the function
vmx_compute_secondary_exec_control() can be executed, then both the module parameter
and exec control fields will be amended.

This patch fixes it by amending module parameter immediately during vmcs data setup.

Reviewed-by: Jim Mattson <jmattson@google.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: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index cbd7afa..7458237 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6730,16 +6730,13 @@ static __init int hardware_setup(void)
        if (!cpu_has_vmx_ept() ||
            !cpu_has_vmx_ept_4levels() ||
            !cpu_has_vmx_ept_mt_wb() ||
-           !cpu_has_vmx_invept_global()) {
+           !cpu_has_vmx_invept_global())
                enable_ept = 0;
-               enable_unrestricted_guest = 0;
-               enable_ept_ad_bits = 0;
-       }
 
        if (!cpu_has_vmx_ept_ad_bits() || !enable_ept)
                enable_ept_ad_bits = 0;
 
-       if (!cpu_has_vmx_unrestricted_guest())
+       if (!cpu_has_vmx_unrestricted_guest() || !enable_ept)
                enable_unrestricted_guest = 0;
 
        if (!cpu_has_vmx_flexpriority())