[PATCH 1/2] KVM: VMX: Introduce handle_ud()

[Wanpeng Li <kernellwp@gmail.com>]

From: Wanpeng Li <wanpengli@tencent.com>

Introduce handle_ud() to handle invalid opcode, this function will be 
used by later patches.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
 arch/x86/kvm/vmx.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9bc05f5..0f99833 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6215,6 +6215,18 @@ static int handle_machine_check(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+static int handle_ud(struct kvm_vcpu *vcpu)
+{
+	enum emulation_result er;
+
+	er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
+	if (er == EMULATE_USER_EXIT)
+		return 0;
+	if (er != EMULATE_DONE)
+		kvm_queue_exception(vcpu, UD_VECTOR);
+	return 1;
+}
+
 static int handle_exception(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -6233,14 +6245,8 @@ static int handle_exception(struct kvm_vcpu *vcpu)
 	if (is_nmi(intr_info))
 		return 1;  /* already handled by vmx_vcpu_run() */
 
-	if (is_invalid_opcode(intr_info)) {
-		er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
-		if (er == EMULATE_USER_EXIT)
-			return 0;
-		if (er != EMULATE_DONE)
-			kvm_queue_exception(vcpu, UD_VECTOR);
-		return 1;
-	}
+	if (is_invalid_opcode(intr_info))
+		return handle_ud(vcpu);
 
 	error_code = 0;
 	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
-- 
2.7.4