4 files changed, 55 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 0941571d34eb..397af0d33539 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -784,6 +784,15 @@ struct kvm_s390_gisa {
 	};
 };
 
+struct kvm_s390_gib {
+	u32 alert_list_origin;
+	u32 reserved01;
+	u8:5;
+	u8  nisc:3;
+	u8  reserved03[3];
+	u32 reserved04[5];
+};
+
 /*
  * sie_page2 has to be allocated as DMA because fac_list, crycb and
  * gisa need 31bit addresses in the sie control block.
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index ee91d1de0036..5efcd9e2cf8f 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -7,6 +7,9 @@
  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  */
 
+#define KMSG_COMPONENT "kvm-s390"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #include <linux/interrupt.h>
 #include <linux/kvm_host.h>
 #include <linux/hrtimer.h>
@@ -31,6 +34,8 @@
 #define PFAULT_DONE 0x0680
 #define VIRTIO_PARAM 0x0d00
 
+static struct kvm_s390_gib *gib;
+
 /* handle external calls via sigp interpretation facility */
 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
 {
@@ -2914,3 +2919,41 @@ void kvm_s390_gisa_destroy(struct kvm *kvm)
 {
 	kvm->arch.gisa_int.origin = NULL;
 }
+
+void kvm_s390_gib_destroy(void)
+{
+	if (!gib)
+		return;
+	chsc_sgib(0);
+	free_page((unsigned long)gib);
+	gib = NULL;
+}
+
+int kvm_s390_gib_init(u8 nisc)
+{
+	int rc = 0;
+
+	if (!css_general_characteristics.aiv) {
+		KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
+		goto out;
+	}
+
+	gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+	if (!gib) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	gib->nisc = nisc;
+	if (chsc_sgib((u32)(u64)gib)) {
+		pr_err("Associating the GIB with the AIV facility failed\n");
+		free_page((unsigned long)gib);
+		gib = NULL;
+		rc = -EIO;
+		goto out;
+	}
+
+	KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
+out:
+	return rc;
+}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 5eaffb3e1738..ede89172b8f4 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -444,6 +444,7 @@ out_debug_unreg:
 
 void kvm_arch_exit(void)
 {
+	kvm_s390_gib_destroy();
 	debug_unregister(kvm_s390_dbf);
 }
 
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 72ef87799593..6d9448dbd052 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -381,6 +381,8 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
 void kvm_s390_gisa_init(struct kvm *kvm);
 void kvm_s390_gisa_clear(struct kvm *kvm);
 void kvm_s390_gisa_destroy(struct kvm *kvm);
+int kvm_s390_gib_init(u8 nisc);
+void kvm_s390_gib_destroy(void);
 
 /* implemented in guestdbg.c */
 void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);