KVM: nVMX: No need for handle_vmx_insn function any more

Before nested VMX support, the exit handler for a guest executing a VMX
instruction (vmclear, vmlaunch, vmptrld, vmptrst, vmread, vmread, vmresume,
vmwrite, vmon, vmoff), was handle_vmx_insn(). This handler simply threw a #UD
exception. Now that all these exit reasons are properly handled (and emulate
the respective VMX instruction), nothing calls this dummy handler and it can
be removed.
Signed-off-by: NNadav Har'El <nyh@il.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/vmx.c

@@ -4309,12 +4309,6 @@ static int handle_vmcall(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
-static int handle_vmx_insn(struct kvm_vcpu *vcpu)
-{
-	kvm_queue_exception(vcpu, UD_VECTOR);
-	return 1;
-}
-
 static int handle_invd(struct kvm_vcpu *vcpu)
 {
 	return emulate_instruction(vcpu, 0) == EMULATE_DONE;