KVM: PPC: Use same kvmppc_prepare_to_enter code for booke and book3s_pr

We need to do the same things when preparing to enter a guest for booke and
book3s_pr cores. Fold the generic code into a generic function that both call.
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/kvm_ppc.h

@@ -112,6 +112,7 @@ extern int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn,
 				     ulong val);
 extern int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn,
 				     ulong *val);
+extern void kvmppc_core_check_requests(struct kvm_vcpu *vcpu);
 
 extern int kvmppc_booke_init(void);
 extern void kvmppc_booke_exit(void);
@@ -150,6 +151,8 @@ extern int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm,
 extern int kvmppc_bookehv_init(void);
 extern void kvmppc_bookehv_exit(void);
 
+extern int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu);
+
 /*
  * Cuts out inst bits with ordering according to spec.
  * That means the leftmost bit is zero. All given bits are included.

arch/powerpc/kvm/book3s_pr.c

@@ -88,6 +88,10 @@ void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
 	kvmppc_giveup_ext(vcpu, MSR_VSX);
 }
 
+void kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
+{
+}
+
 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 {
 	ulong smsr = vcpu->arch.shared->msr;
@@ -815,19 +819,9 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		 * again due to a host external interrupt.
 		 */
 		__hard_irq_disable();
-		if (signal_pending(current)) {
-			__hard_irq_enable();
-#ifdef EXIT_DEBUG
-			printk(KERN_EMERG "KVM: Going back to host\n");
-#endif
-			vcpu->stat.signal_exits++;
+		if (kvmppc_prepare_to_enter(vcpu)) {
 			run->exit_reason = KVM_EXIT_INTR;
 			r = -EINTR;
-		} else {
-			/* In case an interrupt came in that was triggered
-			 * from userspace (like DEC), we need to check what
-			 * to inject now! */
-			kvmppc_core_prepare_to_enter(vcpu);
 		}
 	}
 
@@ -1029,8 +1023,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 		goto out;
 	}
 
-	kvmppc_core_prepare_to_enter(vcpu);
-
 	/*
 	 * Interrupts could be timers for the guest which we have to inject
 	 * again, so let's postpone them until we're in the guest and if we
@@ -1038,9 +1030,7 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 	 * a host external interrupt.
 	 */
 	__hard_irq_disable();
-
-	/* No need to go into the guest when all we do is going out */
-	if (signal_pending(current)) {
+	if (kvmppc_prepare_to_enter(vcpu)) {
 		__hard_irq_enable();
 		kvm_run->exit_reason = KVM_EXIT_INTR;
 		ret = -EINTR;

arch/powerpc/kvm/booke.c

@@ -455,10 +455,8 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
 	return r;
 }
 
-static void kvmppc_check_requests(struct kvm_vcpu *vcpu)
+void kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
 {
-	trace_kvm_check_requests(vcpu);
-
 	if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu))
 		update_timer_ints(vcpu);
 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
@@ -467,60 +465,6 @@ static void kvmppc_check_requests(struct kvm_vcpu *vcpu)
 #endif
 }
 
-/*
- * Common checks before entering the guest world.  Call with interrupts
- * disabled.
- *
- * returns !0 if a signal is pending and check_signal is true
- */
-static int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
-{
-	int r = 0;
-
-	WARN_ON_ONCE(!irqs_disabled());
-	while (true) {
-		if (need_resched()) {
-			local_irq_enable();
-			cond_resched();
-			local_irq_disable();
-			continue;
-		}
-
-		if (signal_pending(current)) {
-			r = 1;
-			break;
-		}
-
-		smp_mb();
-		if (vcpu->requests) {
-			/* Make sure we process requests preemptable */
-			local_irq_enable();
-			kvmppc_check_requests(vcpu);
-			local_irq_disable();
-			continue;
-		}
-
-		if (kvmppc_core_prepare_to_enter(vcpu)) {
-			/* interrupts got enabled in between, so we
-			   are back at square 1 */
-			continue;
-		}
-
-		if (vcpu->mode == EXITING_GUEST_MODE) {
-			r = 1;
-			break;
-		}
-
-		/* Going into guest context! Yay! */
-		vcpu->mode = IN_GUEST_MODE;
-		smp_wmb();
-
-		break;
-	}
-
-	return r;
-}
-
 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 {
 	int ret;

arch/powerpc/kvm/powerpc.c

@@ -47,6 +47,63 @@ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+#ifndef CONFIG_KVM_BOOK3S_64_HV
+/*
+ * Common checks before entering the guest world.  Call with interrupts
+ * disabled.
+ *
+ * returns !0 if a signal is pending and check_signal is true
+ */
+int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
+{
+	int r = 0;
+
+	WARN_ON_ONCE(!irqs_disabled());
+	while (true) {
+		if (need_resched()) {
+			local_irq_enable();
+			cond_resched();
+			local_irq_disable();
+			continue;
+		}
+
+		if (signal_pending(current)) {
+			r = 1;
+			break;
+		}
+
+		smp_mb();
+		if (vcpu->requests) {
+			/* Make sure we process requests preemptable */
+			local_irq_enable();
+			trace_kvm_check_requests(vcpu);
+			kvmppc_core_check_requests(vcpu);
+			local_irq_disable();
+			continue;
+		}
+
+		if (kvmppc_core_prepare_to_enter(vcpu)) {
+			/* interrupts got enabled in between, so we
+			   are back at square 1 */
+			continue;
+		}
+
+		if (vcpu->mode == EXITING_GUEST_MODE) {
+			r = 1;
+			break;
+		}
+
+		/* Going into guest context! Yay! */
+		vcpu->mode = IN_GUEST_MODE;
+		smp_wmb();
+
+		break;
+	}
+
+	return r;
+}
+#endif /* CONFIG_KVM_BOOK3S_64_HV */
+
 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 {
 	int nr = kvmppc_get_gpr(vcpu, 11);