[PATCH v9 29/84] KVM: x86: export kvm_inject_pending_exception()

[Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>]

From: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>

This function is needed for the KVMI_VCPU_INJECT_EXCEPTION command.

Signed-off-by: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h |  1 +
 arch/x86/kvm/x86.c              | 53 +++++++++++++++++++--------------
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e92a12647f4d..4992afc19cf6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1502,6 +1502,7 @@ unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 bool kvm_rdpmc(struct kvm_vcpu *vcpu);
 
+bool kvm_inject_pending_exception(struct kvm_vcpu *vcpu);
 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
 void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr, unsigned long payload);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0bfa800d0ca8..52181eb131dd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7770,6 +7770,36 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu)
 	kvm_x86_ops.update_cr8_intercept(vcpu, tpr, max_irr);
 }
 
+bool kvm_inject_pending_exception(struct kvm_vcpu *vcpu)
+{
+	if (vcpu->arch.exception.pending) {
+		trace_kvm_inj_exception(vcpu->arch.exception.nr,
+					vcpu->arch.exception.has_error_code,
+					vcpu->arch.exception.error_code);
+
+		WARN_ON_ONCE(vcpu->arch.exception.injected);
+		vcpu->arch.exception.pending = false;
+		vcpu->arch.exception.injected = true;
+
+		if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
+			__kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
+					     X86_EFLAGS_RF);
+
+		if (vcpu->arch.exception.nr == DB_VECTOR) {
+			kvm_deliver_exception_payload(vcpu);
+			if (vcpu->arch.dr7 & DR7_GD) {
+				vcpu->arch.dr7 &= ~DR7_GD;
+				kvm_update_dr7(vcpu);
+			}
+		}
+
+		kvm_x86_ops.queue_exception(vcpu);
+		return true;
+	}
+
+	return false;
+}
+
 static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
 {
 	int r;
@@ -7821,29 +7851,8 @@ static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit
 	}
 
 	/* try to inject new event if pending */
-	if (vcpu->arch.exception.pending) {
-		trace_kvm_inj_exception(vcpu->arch.exception.nr,
-					vcpu->arch.exception.has_error_code,
-					vcpu->arch.exception.error_code);
-
-		vcpu->arch.exception.pending = false;
-		vcpu->arch.exception.injected = true;
-
-		if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
-			__kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
-					     X86_EFLAGS_RF);
-
-		if (vcpu->arch.exception.nr == DB_VECTOR) {
-			kvm_deliver_exception_payload(vcpu);
-			if (vcpu->arch.dr7 & DR7_GD) {
-				vcpu->arch.dr7 &= ~DR7_GD;
-				kvm_update_dr7(vcpu);
-			}
-		}
-
-		kvm_x86_ops.queue_exception(vcpu);
+	if (kvm_inject_pending_exception(vcpu))
 		can_inject = false;
-	}
 
 	/*
 	 * Finally, inject interrupt events.  If an event cannot be injected