KVM: VMX: Define a VMX glue macro for kvm_complete_insn_gp()

Define kvm_complete_insn_gp() as vmx_complete_emulated_msr() and use the
glue wrapper in vt_complete_emulated_msr() so that VT's
.complete_emulated_msr() implementation follows the soon-to-be-standard
pattern of:

    vt_abc:
        if (is_td())
            return tdx_abc();
        return vmx_abc();

This will allow generating such wrappers via a macro, which in turn will
make it trivially easy to skip the wrappers entirely when KVM_INTEL_TDX=n.

Suggested-by: Sean Christopherson <[email protected]>
Link: https://lore.kernel.org/kvm/[email protected]/
Cc: Sean Christopherson <[email protected]>
Cc: Rick Edgecombe <[email protected]>
Signed-off-by: Vishal Verma <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[sean: massage shortlog+changelog]
Signed-off-by: Sean Christopherson <[email protected]>

Author: stellarhopper

arch/x86/kvm/vmx/main.c

@@ -240,7 +240,7 @@ static int vt_complete_emulated_msr(struct kvm_vcpu *vcpu, int err)
 	if (is_td_vcpu(vcpu))
 		return tdx_complete_emulated_msr(vcpu, err);
 
-	return kvm_complete_insn_gp(vcpu, err);
+	return vmx_complete_emulated_msr(vcpu, err);
 }
 
 #ifdef CONFIG_KVM_SMM

arch/x86/kvm/vmx/x86_ops.h

@@ -57,6 +57,7 @@ void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu);
 void vmx_update_exception_bitmap(struct kvm_vcpu *vcpu);
 int vmx_get_feature_msr(u32 msr, u64 *data);
 int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
+#define vmx_complete_emulated_msr kvm_complete_insn_gp
 u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg);
 void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);