KVM: s390: clean up return code handling in irq delivery code

Instead of returning a possibly random or'ed together value, let's
always return -EFAULT if rc is set.
Signed-off-by: NJens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>

arch/s390/kvm/interrupt.c

@@ -287,7 +287,7 @@ static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
@@ -306,7 +306,7 @@ static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
@@ -334,7 +334,7 @@ static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
@@ -371,7 +371,7 @@ static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
@@ -389,7 +389,7 @@ static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 	rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_stop(struct kvm_vcpu *vcpu)
@@ -450,7 +450,7 @@ static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
@@ -478,7 +478,7 @@ static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 			    sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
@@ -572,7 +572,7 @@ static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_service(struct kvm_vcpu *vcpu,
@@ -594,7 +594,7 @@ static int __must_check __deliver_service(struct kvm_vcpu *vcpu,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 			   (u32 *)__LC_EXT_PARAMS);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu,
@@ -614,7 +614,7 @@ static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 			   (u64 *)__LC_EXT_PARAMS2);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu,
@@ -639,7 +639,7 @@ static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu,
 			   (u32 *)__LC_EXT_PARAMS);
 	rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 			   (u64 *)__LC_EXT_PARAMS2);
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
@@ -667,7 +667,7 @@ static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 static int __must_check __deliver_mchk_floating(struct kvm_vcpu *vcpu,
@@ -692,7 +692,7 @@ static int __must_check __deliver_mchk_floating(struct kvm_vcpu *vcpu,
 			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 	rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
-	return rc;
+	return rc ? -EFAULT : 0;
 }
 
 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);