KVM: x86 emulator: Clean up init_emulate_ctxt()

Use a local pointer to the emulate_ctxt for simplicity.  Then, arrange
the hard-to-read mode selection lines neatly.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/x86.c

@@ -4508,7 +4508,8 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu)
 
 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
 {
-	struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
+	struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
+	struct decode_cache *c = &ctxt->decode;
 	int cs_db, cs_l;
 
 	/*
@@ -4521,15 +4522,15 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
 
 	kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 
-	vcpu->arch.emulate_ctxt.eflags = kvm_get_rflags(vcpu);
-	vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
-	vcpu->arch.emulate_ctxt.mode =
-		(!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
-		(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
-		? X86EMUL_MODE_VM86 : cs_l
-		? X86EMUL_MODE_PROT64 :	cs_db
-		? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
-	vcpu->arch.emulate_ctxt.guest_mode = is_guest_mode(vcpu);
+	ctxt->eflags = kvm_get_rflags(vcpu);
+	ctxt->eip = kvm_rip_read(vcpu);
+	ctxt->mode = (!is_protmode(vcpu))		? X86EMUL_MODE_REAL :
+		     (ctxt->eflags & X86_EFLAGS_VM)	? X86EMUL_MODE_VM86 :
+		     cs_l				? X86EMUL_MODE_PROT64 :
+		     cs_db				? X86EMUL_MODE_PROT32 :
+							  X86EMUL_MODE_PROT16;
+	ctxt->guest_mode = is_guest_mode(vcpu);
+
 	memset(c, 0, sizeof(struct decode_cache));
 	memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
 	vcpu->arch.emulate_regs_need_sync_from_vcpu = false;