Merge tag 'kvm-s390-next-5.1-1' of...

Merge tag 'kvm-s390-next-5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-next

KVM: s390: Features for 5.1

- Clarify KVM related kernel messages
- Interrupt cleanup
- Introduction of the Guest Information Block (GIB)
- Preparation for processor subfunctions in cpu model

arch/s390/include/asm/cio.h

@@ -331,5 +331,6 @@ extern void css_schedule_reprobe(void);
 /* Function from drivers/s390/cio/chsc.c */
 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta);
 int chsc_sstpi(void *page, void *result, size_t size);
+int chsc_sgib(u32 origin);
 
 #endif

arch/s390/include/asm/irq.h

@@ -62,6 +62,7 @@ enum interruption_class {
 	IRQIO_MSI,
 	IRQIO_VIR,
 	IRQIO_VAI,
+	IRQIO_GAL,
 	NMI_NMI,
 	CPU_RST,
 	NR_ARCH_IRQS

arch/s390/include/asm/isc.h

@@ -21,6 +21,7 @@
 /* Adapter interrupts. */
 #define QDIO_AIRQ_ISC IO_SCH_ISC	/* I/O subchannel in qdio mode */
 #define PCI_ISC 2			/* PCI I/O subchannels */
+#define GAL_ISC 5			/* GIB alert */
 #define AP_ISC 6			/* adjunct processor (crypto) devices */
 
 /* Functions for registration of I/O interruption subclasses */

arch/s390/include/asm/kvm_host.h

@@ -591,7 +591,6 @@ struct kvm_s390_float_interrupt {
 	struct kvm_s390_mchk_info mchk;
 	struct kvm_s390_ext_info srv_signal;
 	int next_rr_cpu;
-	unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 	struct mutex ais_lock;
 	u8 simm;
 	u8 nimm;
@@ -712,6 +711,7 @@ struct s390_io_adapter {
 struct kvm_s390_cpu_model {
 	/* facility mask supported by kvm & hosting machine */
 	__u64 fac_mask[S390_ARCH_FAC_LIST_SIZE_U64];
+	struct kvm_s390_vm_cpu_subfunc subfuncs;
 	/* facility list requested by guest (in dma page) */
 	__u64 *fac_list;
 	u64 cpuid;
@@ -782,9 +782,21 @@ struct kvm_s390_gisa {
 			u8  reserved03[11];
 			u32 airq_count;
 		} g1;
+		struct {
+			u64 word[4];
+		} u64;
 	};
 };
 
+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.
@@ -793,7 +805,8 @@ struct sie_page2 {
 	__u64 fac_list[S390_ARCH_FAC_LIST_SIZE_U64];	/* 0x0000 */
 	struct kvm_s390_crypto_cb crycb;		/* 0x0800 */
 	struct kvm_s390_gisa gisa;			/* 0x0900 */
-	u8 reserved920[0x1000 - 0x920];			/* 0x0920 */
+	struct kvm *kvm;				/* 0x0920 */
+	u8 reserved928[0x1000 - 0x928];			/* 0x0928 */
 };
 
 struct kvm_s390_vsie {
@@ -804,6 +817,20 @@ struct kvm_s390_vsie {
 	struct page *pages[KVM_MAX_VCPUS];
 };
 
+struct kvm_s390_gisa_iam {
+	u8 mask;
+	spinlock_t ref_lock;
+	u32 ref_count[MAX_ISC + 1];
+};
+
+struct kvm_s390_gisa_interrupt {
+	struct kvm_s390_gisa *origin;
+	struct kvm_s390_gisa_iam alert;
+	struct hrtimer timer;
+	u64 expires;
+	DECLARE_BITMAP(kicked_mask, KVM_MAX_VCPUS);
+};
+
 struct kvm_arch{
 	void *sca;
 	int use_esca;
@@ -837,7 +864,8 @@ struct kvm_arch{
 	atomic64_t cmma_dirty_pages;
 	/* subset of available cpu features enabled by user space */
 	DECLARE_BITMAP(cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
-	struct kvm_s390_gisa *gisa;
+	DECLARE_BITMAP(idle_mask, KVM_MAX_VCPUS);
+	struct kvm_s390_gisa_interrupt gisa_int;
 };
 
 #define KVM_HVA_ERR_BAD		(-1UL)
@@ -871,6 +899,9 @@ void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
 extern int sie64a(struct kvm_s390_sie_block *, u64 *);
 extern char sie_exit;
 
+extern int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc);
+extern int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc);
+
 static inline void kvm_arch_hardware_disable(void) {}
 static inline void kvm_arch_check_processor_compat(void *rtn) {}
 static inline void kvm_arch_sync_events(struct kvm *kvm) {}

arch/s390/kernel/irq.c

@@ -88,6 +88,7 @@ static const struct irq_class irqclass_sub_desc[] = {
 	{.irq = IRQIO_MSI,  .name = "MSI", .desc = "[I/O] MSI Interrupt" },
 	{.irq = IRQIO_VIR,  .name = "VIR", .desc = "[I/O] Virtual I/O Devices"},
 	{.irq = IRQIO_VAI,  .name = "VAI", .desc = "[I/O] Virtual I/O Devices AI"},
+	{.irq = IRQIO_GAL,  .name = "GAL", .desc = "[I/O] GIB Alert"},
 	{.irq = NMI_NMI,    .name = "NMI", .desc = "[NMI] Machine Check"},
 	{.irq = CPU_RST,    .name = "RST", .desc = "[CPU] CPU Restart"},
 };

arch/s390/kvm/kvm-s390.c

@@ -432,11 +432,18 @@ int kvm_arch_init(void *opaque)
 	/* Register floating interrupt controller interface. */
 	rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 	if (rc) {
-		pr_err("Failed to register FLIC rc=%d\n", rc);
+		pr_err("A FLIC registration call failed with rc=%d\n", rc);
 		goto out_debug_unreg;
 	}
+
+	rc = kvm_s390_gib_init(GAL_ISC);
+	if (rc)
+		goto out_gib_destroy;
+
 	return 0;
 
+out_gib_destroy:
+	kvm_s390_gib_destroy();
 out_debug_unreg:
 	debug_unregister(kvm_s390_dbf);
 	return rc;
@@ -444,6 +451,7 @@ int kvm_arch_init(void *opaque)
 
 void kvm_arch_exit(void)
 {
+	kvm_s390_gib_destroy();
 	debug_unregister(kvm_s390_dbf);
 }
 
@@ -1258,11 +1266,65 @@ static int kvm_s390_set_processor_feat(struct kvm *kvm,
 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
 					  struct kvm_device_attr *attr)
 {
-	/*
-	 * Once supported by kernel + hw, we have to store the subfunctions
-	 * in kvm->arch and remember that user space configured them.
-	 */
-	return -ENXIO;
+	mutex_lock(&kvm->lock);
+	if (kvm->created_vcpus) {
+		mutex_unlock(&kvm->lock);
+		return -EBUSY;
+	}
+
+	if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
+			   sizeof(struct kvm_s390_vm_cpu_subfunc))) {
+		mutex_unlock(&kvm->lock);
+		return -EFAULT;
+	}
+	mutex_unlock(&kvm->lock);
+
+	VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
+	VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
+	VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
+	VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
+	VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
+	VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
+
+	return 0;
 }
 
 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
@@ -1381,12 +1443,56 @@ static int kvm_s390_get_machine_feat(struct kvm *kvm,
 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
 					  struct kvm_device_attr *attr)
 {
-	/*
-	 * Once we can actually configure subfunctions (kernel + hw support),
-	 * we have to check if they were already set by user space, if so copy
-	 * them from kvm->arch.
-	 */
-	return -ENXIO;
+	if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
+	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
+		return -EFAULT;
+
+	VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
+	VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
+	VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
+	VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
+	VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
+	VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
+		 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
+
+	return 0;
 }
 
 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
@@ -1395,8 +1501,55 @@ static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
 	if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
 	    sizeof(struct kvm_s390_vm_cpu_subfunc)))
 		return -EFAULT;
+
+	VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
+		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
+		 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
+	VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
+	VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
+	VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
+	VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
+	VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
+		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
+		 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
+
 	return 0;
 }
+
 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
 {
 	int ret = -ENXIO;
@@ -1514,10 +1667,9 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
 		case KVM_S390_VM_CPU_PROCESSOR_FEAT:
 		case KVM_S390_VM_CPU_MACHINE_FEAT:
 		case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
+		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
 			ret = 0;
 			break;
-		/* configuring subfunctions is not supported yet */
-		case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
 		default:
 			ret = -ENXIO;
 			break;
@@ -2209,6 +2361,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	if (!kvm->arch.sie_page2)
 		goto out_err;
 
+	kvm->arch.sie_page2->kvm = kvm;
 	kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
 
 	for (i = 0; i < kvm_s390_fac_size(); i++) {
@@ -2218,6 +2371,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 		kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] &
 					      kvm_s390_fac_base[i];
 	}
+	kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
 
 	/* we are always in czam mode - even on pre z14 machines */
 	set_kvm_facility(kvm->arch.model.fac_mask, 138);
@@ -2812,7 +2966,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 
 	vcpu->arch.sie_block->icpua = id;
 	spin_lock_init(&vcpu->arch.local_int.lock);
-	vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa;
+	vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa_int.origin;
 	if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
 		vcpu->arch.sie_block->gd |= GISA_FORMAT1;
 	seqcount_init(&vcpu->arch.cputm_seqcount);
@@ -3458,6 +3612,8 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)
 		kvm_s390_patch_guest_per_regs(vcpu);
 	}
 
+	clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
+
 	vcpu->arch.sie_block->icptcode = 0;
 	cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
 	VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
@@ -4293,12 +4449,12 @@ static int __init kvm_s390_init(void)
 	int i;
 
 	if (!sclp.has_sief2) {
-		pr_info("SIE not available\n");
+		pr_info("SIE is not available\n");
 		return -ENODEV;
 	}
 
 	if (nested && hpage) {
-		pr_info("nested (vSIE) and hpage (huge page backing) can currently not be activated concurrently");
+		pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
 		return -EINVAL;
 	}
 

arch/s390/kvm/kvm-s390.h

@@ -67,7 +67,7 @@ static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
 
 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
 {
-	return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.float_int.idle_mask);
+	return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
 }
 
 static inline int kvm_is_ucontrol(struct kvm *kvm)
@@ -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);

drivers/s390/cio/chsc.c

@@ -1382,3 +1382,40 @@ int chsc_pnso_brinfo(struct subchannel_id schid,
 	return chsc_error_from_response(brinfo_area->response.code);
 }
 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);
+
+int chsc_sgib(u32 origin)
+{
+	struct {
+		struct chsc_header request;
+		u16 op;
+		u8  reserved01[2];
+		u8  reserved02:4;
+		u8  fmt:4;
+		u8  reserved03[7];
+		/* operation data area begin */
+		u8  reserved04[4];
+		u32 gib_origin;
+		u8  reserved05[10];
+		u8  aix;
+		u8  reserved06[4029];
+		struct chsc_header response;
+		u8  reserved07[4];
+	} *sgib_area;
+	int ret;
+
+	spin_lock_irq(&chsc_page_lock);
+	memset(chsc_page, 0, PAGE_SIZE);
+	sgib_area = chsc_page;
+	sgib_area->request.length = 0x0fe0;
+	sgib_area->request.code = 0x0021;
+	sgib_area->op = 0x1;
+	sgib_area->gib_origin = origin;
+
+	ret = chsc(sgib_area);
+	if (ret == 0)
+		ret = chsc_error_from_response(sgib_area->response.code);
+	spin_unlock_irq(&chsc_page_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_sgib);

drivers/s390/cio/chsc.h

@@ -164,6 +164,7 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp);
 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd);
 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
 	      u64 summary_indicator_addr, u64 subchannel_indicator_addr);
+int chsc_sgib(u32 origin);
 int chsc_error_from_response(int response);
 
 int chsc_siosl(struct subchannel_id schid);