Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2927 insertions, 0 deletions

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
new file mode 100644
index 000000000..3dcfe98f7
--- /dev/null
+++ b/arch/s390/kvm/interrupt.c
@@ -0,0 +1,2927 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * handling kvm guest interrupts
+ *
+ * Copyright IBM Corp. 2008, 2015
+ *
+ *    Author(s): Carsten Otte <cotte@de.ibm.com>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kvm_host.h>
+#include <linux/hrtimer.h>
+#include <linux/mmu_context.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/bitmap.h>
+#include <linux/vmalloc.h>
+#include <asm/asm-offsets.h>
+#include <asm/dis.h>
+#include <linux/uaccess.h>
+#include <asm/sclp.h>
+#include <asm/isc.h>
+#include <asm/gmap.h>
+#include <asm/switch_to.h>
+#include <asm/nmi.h>
+#include "kvm-s390.h"
+#include "gaccess.h"
+#include "trace-s390.h"
+
+#define PFAULT_INIT 0x0600
+#define PFAULT_DONE 0x0680
+#define VIRTIO_PARAM 0x0d00
+
+/* handle external calls via sigp interpretation facility */
+static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
+{
+	int c, scn;
+
+	if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
+		return 0;
+
+	BUG_ON(!kvm_s390_use_sca_entries());
+	read_lock(&vcpu->kvm->arch.sca_lock);
+	if (vcpu->kvm->arch.use_esca) {
+		struct esca_block *sca = vcpu->kvm->arch.sca;
+		union esca_sigp_ctrl sigp_ctrl =
+			sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+
+		c = sigp_ctrl.c;
+		scn = sigp_ctrl.scn;
+	} else {
+		struct bsca_block *sca = vcpu->kvm->arch.sca;
+		union bsca_sigp_ctrl sigp_ctrl =
+			sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+
+		c = sigp_ctrl.c;
+		scn = sigp_ctrl.scn;
+	}
+	read_unlock(&vcpu->kvm->arch.sca_lock);
+
+	if (src_id)
+		*src_id = scn;
+
+	return c;
+}
+
+static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
+{
+	int expect, rc;
+
+	BUG_ON(!kvm_s390_use_sca_entries());
+	read_lock(&vcpu->kvm->arch.sca_lock);
+	if (vcpu->kvm->arch.use_esca) {
+		struct esca_block *sca = vcpu->kvm->arch.sca;
+		union esca_sigp_ctrl *sigp_ctrl =
+			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+		union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
+
+		new_val.scn = src_id;
+		new_val.c = 1;
+		old_val.c = 0;
+
+		expect = old_val.value;
+		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
+	} else {
+		struct bsca_block *sca = vcpu->kvm->arch.sca;
+		union bsca_sigp_ctrl *sigp_ctrl =
+			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+		union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
+
+		new_val.scn = src_id;
+		new_val.c = 1;
+		old_val.c = 0;
+
+		expect = old_val.value;
+		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
+	}
+	read_unlock(&vcpu->kvm->arch.sca_lock);
+
+	if (rc != expect) {
+		/* another external call is pending */
+		return -EBUSY;
+	}
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
+	return 0;
+}
+
+static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
+{
+	int rc, expect;
+
+	if (!kvm_s390_use_sca_entries())
+		return;
+	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
+	read_lock(&vcpu->kvm->arch.sca_lock);
+	if (vcpu->kvm->arch.use_esca) {
+		struct esca_block *sca = vcpu->kvm->arch.sca;
+		union esca_sigp_ctrl *sigp_ctrl =
+			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+		union esca_sigp_ctrl old = *sigp_ctrl;
+
+		expect = old.value;
+		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
+	} else {
+		struct bsca_block *sca = vcpu->kvm->arch.sca;
+		union bsca_sigp_ctrl *sigp_ctrl =
+			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
+		union bsca_sigp_ctrl old = *sigp_ctrl;
+
+		expect = old.value;
+		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
+	}
+	read_unlock(&vcpu->kvm->arch.sca_lock);
+	WARN_ON(rc != expect); /* cannot clear? */
+}
+
+int psw_extint_disabled(struct kvm_vcpu *vcpu)
+{
+	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
+}
+
+static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
+{
+	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
+}
+
+static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
+{
+	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
+}
+
+static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
+{
+	return psw_extint_disabled(vcpu) &&
+	       psw_ioint_disabled(vcpu) &&
+	       psw_mchk_disabled(vcpu);
+}
+
+static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
+{
+	if (psw_extint_disabled(vcpu) ||
+	    !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
+		return 0;
+	if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
+		/* No timer interrupts when single stepping */
+		return 0;
+	return 1;
+}
+
+static int ckc_irq_pending(struct kvm_vcpu *vcpu)
+{
+	const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
+	const u64 ckc = vcpu->arch.sie_block->ckc;
+
+	if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
+		if ((s64)ckc >= (s64)now)
+			return 0;
+	} else if (ckc >= now) {
+		return 0;
+	}
+	return ckc_interrupts_enabled(vcpu);
+}
+
+static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
+{
+	return !psw_extint_disabled(vcpu) &&
+	       (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
+}
+
+static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
+{
+	if (!cpu_timer_interrupts_enabled(vcpu))
+		return 0;
+	return kvm_s390_get_cpu_timer(vcpu) >> 63;
+}
+
+static uint64_t isc_to_isc_bits(int isc)
+{
+	return (0x80 >> isc) << 24;
+}
+
+static inline u32 isc_to_int_word(u8 isc)
+{
+	return ((u32)isc << 27) | 0x80000000;
+}
+
+static inline u8 int_word_to_isc(u32 int_word)
+{
+	return (int_word & 0x38000000) >> 27;
+}
+
+/*
+ * To use atomic bitmap functions, we have to provide a bitmap address
+ * that is u64 aligned. However, the ipm might be u32 aligned.
+ * Therefore, we logically start the bitmap at the very beginning of the
+ * struct and fixup the bit number.
+ */
+#define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
+
+static inline void kvm_s390_gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+	set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
+}
+
+static inline u8 kvm_s390_gisa_get_ipm(struct kvm_s390_gisa *gisa)
+{
+	return READ_ONCE(gisa->ipm);
+}
+
+static inline void kvm_s390_gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+	clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
+}
+
+static inline int kvm_s390_gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+	return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
+}
+
+static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
+{
+	return vcpu->kvm->arch.float_int.pending_irqs |
+		vcpu->arch.local_int.pending_irqs;
+}
+
+static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
+{
+	return pending_irqs_no_gisa(vcpu) |
+		kvm_s390_gisa_get_ipm(vcpu->kvm->arch.gisa) << IRQ_PEND_IO_ISC_7;
+}
+
+static inline int isc_to_irq_type(unsigned long isc)
+{
+	return IRQ_PEND_IO_ISC_0 - isc;
+}
+
+static inline int irq_type_to_isc(unsigned long irq_type)
+{
+	return IRQ_PEND_IO_ISC_0 - irq_type;
+}
+
+static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
+				   unsigned long active_mask)
+{
+	int i;
+
+	for (i = 0; i <= MAX_ISC; i++)
+		if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
+			active_mask &= ~(1UL << (isc_to_irq_type(i)));
+
+	return active_mask;
+}
+
+static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
+{
+	unsigned long active_mask;
+
+	active_mask = pending_irqs(vcpu);
+	if (!active_mask)
+		return 0;
+
+	if (psw_extint_disabled(vcpu))
+		active_mask &= ~IRQ_PEND_EXT_MASK;
+	if (psw_ioint_disabled(vcpu))
+		active_mask &= ~IRQ_PEND_IO_MASK;
+	else
+		active_mask = disable_iscs(vcpu, active_mask);
+	if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
+		__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
+	if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
+		__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
+	if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
+		__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
+	if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
+		__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
+	if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
+		__clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
+	if (psw_mchk_disabled(vcpu))
+		active_mask &= ~IRQ_PEND_MCHK_MASK;
+	/*
+	 * Check both floating and local interrupt's cr14 because
+	 * bit IRQ_PEND_MCHK_REP could be set in both cases.
+	 */
+	if (!(vcpu->arch.sie_block->gcr[14] &
+	   (vcpu->kvm->arch.float_int.mchk.cr14 |
+	   vcpu->arch.local_int.irq.mchk.cr14)))
+		__clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
+
+	/*
+	 * STOP irqs will never be actively delivered. They are triggered via
+	 * intercept requests and cleared when the stop intercept is performed.
+	 */
+	__clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
+
+	return active_mask;
+}
+
+static void __set_cpu_idle(struct kvm_vcpu *vcpu)
+{
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
+	set_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.float_int.idle_mask);
+}
+
+static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
+{
+	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
+	clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.float_int.idle_mask);
+}
+
+static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
+{
+	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
+				      CPUSTAT_STOP_INT);
+	vcpu->arch.sie_block->lctl = 0x0000;
+	vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
+
+	if (guestdbg_enabled(vcpu)) {
+		vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
+					       LCTL_CR10 | LCTL_CR11);
+		vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
+	}
+}
+
+static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
+{
+	if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
+		return;
+	else if (psw_ioint_disabled(vcpu))
+		kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
+	else
+		vcpu->arch.sie_block->lctl |= LCTL_CR6;
+}
+
+static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
+{
+	if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
+		return;
+	if (psw_extint_disabled(vcpu))
+		kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	else
+		vcpu->arch.sie_block->lctl |= LCTL_CR0;
+}
+
+static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
+{
+	if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
+		return;
+	if (psw_mchk_disabled(vcpu))
+		vcpu->arch.sie_block->ictl |= ICTL_LPSW;
+	else
+		vcpu->arch.sie_block->lctl |= LCTL_CR14;
+}
+
+static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
+{
+	if (kvm_s390_is_stop_irq_pending(vcpu))
+		kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
+}
+
+/* Set interception request for non-deliverable interrupts */
+static void set_intercept_indicators(struct kvm_vcpu *vcpu)
+{
+	set_intercept_indicators_io(vcpu);
+	set_intercept_indicators_ext(vcpu);
+	set_intercept_indicators_mchk(vcpu);
+	set_intercept_indicators_stop(vcpu);
+}
+
+static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc;
+
+	vcpu->stat.deliver_cputm++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
+					 0, 0);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
+			   (u16 *)__LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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));
+	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+	return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc;
+
+	vcpu->stat.deliver_ckc++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
+					 0, 0);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
+			   (u16 __user *)__LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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));
+	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+	return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_ext_info ext;
+	int rc;
+
+	spin_lock(&li->lock);
+	ext = li->irq.ext;
+	clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
+	li->irq.ext.ext_params2 = 0;
+	spin_unlock(&li->lock);
+
+	VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
+		   ext.ext_params2);
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+					 KVM_S390_INT_PFAULT_INIT,
+					 0, ext.ext_params2);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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));
+	rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
+	return rc ? -EFAULT : 0;
+}
+
+static int __write_machine_check(struct kvm_vcpu *vcpu,
+				 struct kvm_s390_mchk_info *mchk)
+{
+	unsigned long ext_sa_addr;
+	unsigned long lc;
+	freg_t fprs[NUM_FPRS];
+	union mci mci;
+	int rc;
+
+	mci.val = mchk->mcic;
+	/* take care of lazy register loading */
+	save_fpu_regs();
+	save_access_regs(vcpu->run->s.regs.acrs);
+	if (MACHINE_HAS_GS && vcpu->arch.gs_enabled)
+		save_gs_cb(current->thread.gs_cb);
+
+	/* Extended save area */
+	rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
+			   sizeof(unsigned long));
+	/* Only bits 0 through 63-LC are used for address formation */
+	lc = ext_sa_addr & MCESA_LC_MASK;
+	if (test_kvm_facility(vcpu->kvm, 133)) {
+		switch (lc) {
+		case 0:
+		case 10:
+			ext_sa_addr &= ~0x3ffUL;
+			break;
+		case 11:
+			ext_sa_addr &= ~0x7ffUL;
+			break;
+		case 12:
+			ext_sa_addr &= ~0xfffUL;
+			break;
+		default:
+			ext_sa_addr = 0;
+			break;
+		}
+	} else {
+		ext_sa_addr &= ~0x3ffUL;
+	}
+
+	if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
+		if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
+				    512))
+			mci.vr = 0;
+	} else {
+		mci.vr = 0;
+	}
+	if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
+	    && (lc == 11 || lc == 12)) {
+		if (write_guest_abs(vcpu, ext_sa_addr + 1024,
+				    &vcpu->run->s.regs.gscb, 32))
+			mci.gs = 0;
+	} else {
+		mci.gs = 0;
+	}
+
+	/* General interruption information */
+	rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
+	rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
+			     &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));
+	rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
+
+	/* Register-save areas */
+	if (MACHINE_HAS_VX) {
+		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
+		rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
+	} else {
+		rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
+				     vcpu->run->s.regs.fprs, 128);
+	}
+	rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
+			     vcpu->run->s.regs.gprs, 128);
+	rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
+			   (u32 __user *) __LC_FP_CREG_SAVE_AREA);
+	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
+			   (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
+	rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
+			   (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
+	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
+			   (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
+	rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
+			     &vcpu->run->s.regs.acrs, 64);
+	rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
+			     &vcpu->arch.sie_block->gcr, 128);
+
+	/* Extended interruption information */
+	rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
+			   (u32 __user *) __LC_EXT_DAMAGE_CODE);
+	rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
+			   (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
+			     sizeof(mchk->fixed_logout));
+	return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_mchk_info mchk = {};
+	int deliver = 0;
+	int rc = 0;
+
+	spin_lock(&fi->lock);
+	spin_lock(&li->lock);
+	if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
+	    test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
+		/*
+		 * If there was an exigent machine check pending, then any
+		 * repressible machine checks that might have been pending
+		 * are indicated along with it, so always clear bits for
+		 * repressible and exigent interrupts
+		 */
+		mchk = li->irq.mchk;
+		clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
+		clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
+		memset(&li->irq.mchk, 0, sizeof(mchk));
+		deliver = 1;
+	}
+	/*
+	 * We indicate floating repressible conditions along with
+	 * other pending conditions. Channel Report Pending and Channel
+	 * Subsystem damage are the only two and and are indicated by
+	 * bits in mcic and masked in cr14.
+	 */
+	if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
+		mchk.mcic |= fi->mchk.mcic;
+		mchk.cr14 |= fi->mchk.cr14;
+		memset(&fi->mchk, 0, sizeof(mchk));
+		deliver = 1;
+	}
+	spin_unlock(&li->lock);
+	spin_unlock(&fi->lock);
+
+	if (deliver) {
+		VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
+			   mchk.mcic);
+		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+						 KVM_S390_MCHK,
+						 mchk.cr14, mchk.mcic);
+		vcpu->stat.deliver_machine_check++;
+		rc = __write_machine_check(vcpu, &mchk);
+	}
+	return rc;
+}
+
+static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc;
+
+	VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
+	vcpu->stat.deliver_restart_signal++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
+
+	rc  = write_guest_lc(vcpu,
+			     offsetof(struct lowcore, restart_old_psw),
+			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+	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 ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_prefix_info prefix;
+
+	spin_lock(&li->lock);
+	prefix = li->irq.prefix;
+	li->irq.prefix.address = 0;
+	clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
+	spin_unlock(&li->lock);
+
+	vcpu->stat.deliver_prefix_signal++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+					 KVM_S390_SIGP_SET_PREFIX,
+					 prefix.address, 0);
+
+	kvm_s390_set_prefix(vcpu, prefix.address);
+	return 0;
+}
+
+static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc;
+	int cpu_addr;
+
+	spin_lock(&li->lock);
+	cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
+	clear_bit(cpu_addr, li->sigp_emerg_pending);
+	if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
+		clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
+	spin_unlock(&li->lock);
+
+	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
+	vcpu->stat.deliver_emergency_signal++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
+					 cpu_addr, 0);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
+			   (u16 *)__LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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 ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_extcall_info extcall;
+	int rc;
+
+	spin_lock(&li->lock);
+	extcall = li->irq.extcall;
+	li->irq.extcall.code = 0;
+	clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
+	spin_unlock(&li->lock);
+
+	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
+	vcpu->stat.deliver_external_call++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+					 KVM_S390_INT_EXTERNAL_CALL,
+					 extcall.code, 0);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
+			   (u16 *)__LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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 ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_pgm_info pgm_info;
+	int rc = 0, nullifying = false;
+	u16 ilen;
+
+	spin_lock(&li->lock);
+	pgm_info = li->irq.pgm;
+	clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
+	memset(&li->irq.pgm, 0, sizeof(pgm_info));
+	spin_unlock(&li->lock);
+
+	ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
+	VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
+		   pgm_info.code, ilen);
+	vcpu->stat.deliver_program++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
+					 pgm_info.code, 0);
+
+	switch (pgm_info.code & ~PGM_PER) {
+	case PGM_AFX_TRANSLATION:
+	case PGM_ASX_TRANSLATION:
+	case PGM_EX_TRANSLATION:
+	case PGM_LFX_TRANSLATION:
+	case PGM_LSTE_SEQUENCE:
+	case PGM_LSX_TRANSLATION:
+	case PGM_LX_TRANSLATION:
+	case PGM_PRIMARY_AUTHORITY:
+	case PGM_SECONDARY_AUTHORITY:
+		nullifying = true;
+		/* fall through */
+	case PGM_SPACE_SWITCH:
+		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+				  (u64 *)__LC_TRANS_EXC_CODE);
+		break;
+	case PGM_ALEN_TRANSLATION:
+	case PGM_ALE_SEQUENCE:
+	case PGM_ASTE_INSTANCE:
+	case PGM_ASTE_SEQUENCE:
+	case PGM_ASTE_VALIDITY:
+	case PGM_EXTENDED_AUTHORITY:
+		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
+				  (u8 *)__LC_EXC_ACCESS_ID);
+		nullifying = true;
+		break;
+	case PGM_ASCE_TYPE:
+	case PGM_PAGE_TRANSLATION:
+	case PGM_REGION_FIRST_TRANS:
+	case PGM_REGION_SECOND_TRANS:
+	case PGM_REGION_THIRD_TRANS:
+	case PGM_SEGMENT_TRANSLATION:
+		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+				  (u64 *)__LC_TRANS_EXC_CODE);
+		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
+				   (u8 *)__LC_EXC_ACCESS_ID);
+		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
+				   (u8 *)__LC_OP_ACCESS_ID);
+		nullifying = true;
+		break;
+	case PGM_MONITOR:
+		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
+				  (u16 *)__LC_MON_CLASS_NR);
+		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
+				   (u64 *)__LC_MON_CODE);
+		break;
+	case PGM_VECTOR_PROCESSING:
+	case PGM_DATA:
+		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
+				  (u32 *)__LC_DATA_EXC_CODE);
+		break;
+	case PGM_PROTECTION:
+		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
+				  (u64 *)__LC_TRANS_EXC_CODE);
+		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
+				   (u8 *)__LC_EXC_ACCESS_ID);
+		break;
+	case PGM_STACK_FULL:
+	case PGM_STACK_EMPTY:
+	case PGM_STACK_SPECIFICATION:
+	case PGM_STACK_TYPE:
+	case PGM_STACK_OPERATION:
+	case PGM_TRACE_TABEL:
+	case PGM_CRYPTO_OPERATION:
+		nullifying = true;
+		break;
+	}
+
+	if (pgm_info.code & PGM_PER) {
+		rc |= put_guest_lc(vcpu, pgm_info.per_code,
+				   (u8 *) __LC_PER_CODE);
+		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
+				   (u8 *)__LC_PER_ATMID);
+		rc |= put_guest_lc(vcpu, pgm_info.per_address,
+				   (u64 *) __LC_PER_ADDRESS);
+		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
+				   (u8 *) __LC_PER_ACCESS_ID);
+	}
+
+	if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
+		kvm_s390_rewind_psw(vcpu, ilen);
+
+	/* bit 1+2 of the target are the ilc, so we can directly use ilen */
+	rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
+	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
+				 (u64 *) __LC_LAST_BREAK);
+	rc |= put_guest_lc(vcpu, pgm_info.code,
+			   (u16 *)__LC_PGM_INT_CODE);
+	rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
+			     &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 ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+	struct kvm_s390_ext_info ext;
+	int rc = 0;
+
+	spin_lock(&fi->lock);
+	if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
+		spin_unlock(&fi->lock);
+		return 0;
+	}
+	ext = fi->srv_signal;
+	memset(&fi->srv_signal, 0, sizeof(ext));
+	clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+
+	VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
+		   ext.ext_params);
+	vcpu->stat.deliver_service_signal++;
+	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
+					 ext.ext_params, 0);
+
+	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
+	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
+	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+			     &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));
+	rc |= put_guest_lc(vcpu, ext.ext_params,
+			   (u32 *)__LC_EXT_PARAMS);
+
+	return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+	struct kvm_s390_interrupt_info *inti;
+	int rc = 0;
+
+	spin_lock(&fi->lock);
+	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
+					struct kvm_s390_interrupt_info,
+					list);
+	if (inti) {
+		list_del(&inti->list);
+		fi->counters[FIRQ_CNTR_PFAULT] -= 1;
+	}
+	if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
+		clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+
+	if (inti) {
+		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+						 KVM_S390_INT_PFAULT_DONE, 0,
+						 inti->ext.ext_params2);
+		VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
+			   inti->ext.ext_params2);
+
+		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
+				(u16 *)__LC_EXT_INT_CODE);
+		rc |= put_guest_lc(vcpu, PFAULT_DONE,
+				(u16 *)__LC_EXT_CPU_ADDR);
+		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+				&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));
+		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
+				(u64 *)__LC_EXT_PARAMS2);
+		kfree(inti);
+	}
+	return rc ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+	struct kvm_s390_interrupt_info *inti;
+	int rc = 0;
+
+	spin_lock(&fi->lock);
+	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
+					struct kvm_s390_interrupt_info,
+					list);
+	if (inti) {
+		VCPU_EVENT(vcpu, 4,
+			   "deliver: virtio parm: 0x%x,parm64: 0x%llx",
+			   inti->ext.ext_params, inti->ext.ext_params2);
+		vcpu->stat.deliver_virtio++;
+		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+				inti->type,
+				inti->ext.ext_params,
+				inti->ext.ext_params2);
+		list_del(&inti->list);
+		fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
+	}
+	if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
+		clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+
+	if (inti) {
+		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
+				(u16 *)__LC_EXT_INT_CODE);
+		rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
+				(u16 *)__LC_EXT_CPU_ADDR);
+		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+				&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));
+		rc |= put_guest_lc(vcpu, inti->ext.ext_params,
+				(u32 *)__LC_EXT_PARAMS);
+		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
+				(u64 *)__LC_EXT_PARAMS2);
+		kfree(inti);
+	}
+	return rc ? -EFAULT : 0;
+}
+
+static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
+{
+	int rc;
+
+	rc  = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
+	rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
+	rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
+	rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
+	rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
+			     &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 ? -EFAULT : 0;
+}
+
+static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
+				     unsigned long irq_type)
+{
+	struct list_head *isc_list;
+	struct kvm_s390_float_interrupt *fi;
+	struct kvm_s390_interrupt_info *inti = NULL;
+	struct kvm_s390_io_info io;
+	u32 isc;
+	int rc = 0;
+
+	fi = &vcpu->kvm->arch.float_int;
+
+	spin_lock(&fi->lock);
+	isc = irq_type_to_isc(irq_type);
+	isc_list = &fi->lists[isc];
+	inti = list_first_entry_or_null(isc_list,
+					struct kvm_s390_interrupt_info,
+					list);
+	if (inti) {
+		if (inti->type & KVM_S390_INT_IO_AI_MASK)
+			VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
+		else
+			VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
+			inti->io.subchannel_id >> 8,
+			inti->io.subchannel_id >> 1 & 0x3,
+			inti->io.subchannel_nr);
+
+		vcpu->stat.deliver_io++;
+		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+				inti->type,
+				((__u32)inti->io.subchannel_id << 16) |
+				inti->io.subchannel_nr,
+				((__u64)inti->io.io_int_parm << 32) |
+				inti->io.io_int_word);
+		list_del(&inti->list);
+		fi->counters[FIRQ_CNTR_IO] -= 1;
+	}
+	if (list_empty(isc_list))
+		clear_bit(irq_type, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+
+	if (inti) {
+		rc = __do_deliver_io(vcpu, &(inti->io));
+		kfree(inti);
+		goto out;
+	}
+
+	if (vcpu->kvm->arch.gisa &&
+	    kvm_s390_gisa_tac_ipm_gisc(vcpu->kvm->arch.gisa, isc)) {
+		/*
+		 * in case an adapter interrupt was not delivered
+		 * in SIE context KVM will handle the delivery
+		 */
+		VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
+		memset(&io, 0, sizeof(io));
+		io.io_int_word = isc_to_int_word(isc);
+		vcpu->stat.deliver_io++;
+		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
+			KVM_S390_INT_IO(1, 0, 0, 0),
+			((__u32)io.subchannel_id << 16) |
+			io.subchannel_nr,
+			((__u64)io.io_int_parm << 32) |
+			io.io_int_word);
+		rc = __do_deliver_io(vcpu, &io);
+	}
+out:
+	return rc;
+}
+
+/* Check whether an external call is pending (deliverable or not) */
+int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	if (!sclp.has_sigpif)
+		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
+
+	return sca_ext_call_pending(vcpu, NULL);
+}
+
+int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
+{
+	if (deliverable_irqs(vcpu))
+		return 1;
+
+	if (kvm_cpu_has_pending_timer(vcpu))
+		return 1;
+
+	/* external call pending and deliverable */
+	if (kvm_s390_ext_call_pending(vcpu) &&
+	    !psw_extint_disabled(vcpu) &&
+	    (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
+		return 1;
+
+	if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
+		return 1;
+	return 0;
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
+}
+
+static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
+{
+	const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
+	const u64 ckc = vcpu->arch.sie_block->ckc;
+	u64 cputm, sltime = 0;
+
+	if (ckc_interrupts_enabled(vcpu)) {
+		if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
+			if ((s64)now < (s64)ckc)
+				sltime = tod_to_ns((s64)ckc - (s64)now);
+		} else if (now < ckc) {
+			sltime = tod_to_ns(ckc - now);
+		}
+		/* already expired */
+		if (!sltime)
+			return 0;
+		if (cpu_timer_interrupts_enabled(vcpu)) {
+			cputm = kvm_s390_get_cpu_timer(vcpu);
+			/* already expired? */
+			if (cputm >> 63)
+				return 0;
+			return min(sltime, tod_to_ns(cputm));
+		}
+	} else if (cpu_timer_interrupts_enabled(vcpu)) {
+		sltime = kvm_s390_get_cpu_timer(vcpu);
+		/* already expired? */
+		if (sltime >> 63)
+			return 0;
+	}
+	return sltime;
+}
+
+int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
+{
+	u64 sltime;
+
+	vcpu->stat.exit_wait_state++;
+
+	/* fast path */
+	if (kvm_arch_vcpu_runnable(vcpu))
+		return 0;
+
+	if (psw_interrupts_disabled(vcpu)) {
+		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
+		return -EOPNOTSUPP; /* disabled wait */
+	}
+
+	if (!ckc_interrupts_enabled(vcpu) &&
+	    !cpu_timer_interrupts_enabled(vcpu)) {
+		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
+		__set_cpu_idle(vcpu);
+		goto no_timer;
+	}
+
+	sltime = __calculate_sltime(vcpu);
+	if (!sltime)
+		return 0;
+
+	__set_cpu_idle(vcpu);
+	hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
+	VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
+no_timer:
+	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
+	kvm_vcpu_block(vcpu);
+	__unset_cpu_idle(vcpu);
+	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	hrtimer_cancel(&vcpu->arch.ckc_timer);
+	return 0;
+}
+
+void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * We cannot move this into the if, as the CPU might be already
+	 * in kvm_vcpu_block without having the waitqueue set (polling)
+	 */
+	vcpu->valid_wakeup = true;
+	/*
+	 * This is mostly to document, that the read in swait_active could
+	 * be moved before other stores, leading to subtle races.
+	 * All current users do not store or use an atomic like update
+	 */
+	smp_mb__after_atomic();
+	if (swait_active(&vcpu->wq)) {
+		/*
+		 * The vcpu gave up the cpu voluntarily, mark it as a good
+		 * yield-candidate.
+		 */
+		vcpu->preempted = true;
+		swake_up_one(&vcpu->wq);
+		vcpu->stat.halt_wakeup++;
+	}
+	/*
+	 * The VCPU might not be sleeping but is executing the VSIE. Let's
+	 * kick it, so it leaves the SIE to process the request.
+	 */
+	kvm_s390_vsie_kick(vcpu);
+}
+
+enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
+{
+	struct kvm_vcpu *vcpu;
+	u64 sltime;
+
+	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
+	sltime = __calculate_sltime(vcpu);
+
+	/*
+	 * If the monotonic clock runs faster than the tod clock we might be
+	 * woken up too early and have to go back to sleep to avoid deadlocks.
+	 */
+	if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
+		return HRTIMER_RESTART;
+	kvm_s390_vcpu_wakeup(vcpu);
+	return HRTIMER_NORESTART;
+}
+
+void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	spin_lock(&li->lock);
+	li->pending_irqs = 0;
+	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
+	memset(&li->irq, 0, sizeof(li->irq));
+	spin_unlock(&li->lock);
+
+	sca_clear_ext_call(vcpu);
+}
+
+int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc = 0;
+	unsigned long irq_type;
+	unsigned long irqs;
+
+	__reset_intercept_indicators(vcpu);
+
+	/* pending ckc conditions might have been invalidated */
+	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+	if (ckc_irq_pending(vcpu))
+		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+
+	/* pending cpu timer conditions might have been invalidated */
+	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+	if (cpu_timer_irq_pending(vcpu))
+		set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+
+	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
+		/* bits are in the reverse order of interrupt priority */
+		irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
+		switch (irq_type) {
+		case IRQ_PEND_IO_ISC_0:
+		case IRQ_PEND_IO_ISC_1:
+		case IRQ_PEND_IO_ISC_2:
+		case IRQ_PEND_IO_ISC_3:
+		case IRQ_PEND_IO_ISC_4:
+		case IRQ_PEND_IO_ISC_5:
+		case IRQ_PEND_IO_ISC_6:
+		case IRQ_PEND_IO_ISC_7:
+			rc = __deliver_io(vcpu, irq_type);
+			break;
+		case IRQ_PEND_MCHK_EX:
+		case IRQ_PEND_MCHK_REP:
+			rc = __deliver_machine_check(vcpu);
+			break;
+		case IRQ_PEND_PROG:
+			rc = __deliver_prog(vcpu);
+			break;
+		case IRQ_PEND_EXT_EMERGENCY:
+			rc = __deliver_emergency_signal(vcpu);
+			break;
+		case IRQ_PEND_EXT_EXTERNAL:
+			rc = __deliver_external_call(vcpu);
+			break;
+		case IRQ_PEND_EXT_CLOCK_COMP:
+			rc = __deliver_ckc(vcpu);
+			break;
+		case IRQ_PEND_EXT_CPU_TIMER:
+			rc = __deliver_cpu_timer(vcpu);
+			break;
+		case IRQ_PEND_RESTART:
+			rc = __deliver_restart(vcpu);
+			break;
+		case IRQ_PEND_SET_PREFIX:
+			rc = __deliver_set_prefix(vcpu);
+			break;
+		case IRQ_PEND_PFAULT_INIT:
+			rc = __deliver_pfault_init(vcpu);
+			break;
+		case IRQ_PEND_EXT_SERVICE:
+			rc = __deliver_service(vcpu);
+			break;
+		case IRQ_PEND_PFAULT_DONE:
+			rc = __deliver_pfault_done(vcpu);
+			break;
+		case IRQ_PEND_VIRTIO:
+			rc = __deliver_virtio(vcpu);
+			break;
+		default:
+			WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
+			clear_bit(irq_type, &li->pending_irqs);
+		}
+	}
+
+	set_intercept_indicators(vcpu);
+
+	return rc;
+}
+
+static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_program++;
+	VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
+				   irq->u.pgm.code, 0);
+
+	if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
+		/* auto detection if no valid ILC was given */
+		irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
+		irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
+		irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
+	}
+
+	if (irq->u.pgm.code == PGM_PER) {
+		li->irq.pgm.code |= PGM_PER;
+		li->irq.pgm.flags = irq->u.pgm.flags;
+		/* only modify PER related information */
+		li->irq.pgm.per_address = irq->u.pgm.per_address;
+		li->irq.pgm.per_code = irq->u.pgm.per_code;
+		li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
+		li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
+	} else if (!(irq->u.pgm.code & PGM_PER)) {
+		li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
+				   irq->u.pgm.code;
+		li->irq.pgm.flags = irq->u.pgm.flags;
+		/* only modify non-PER information */
+		li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
+		li->irq.pgm.mon_code = irq->u.pgm.mon_code;
+		li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
+		li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
+		li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
+		li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
+	} else {
+		li->irq.pgm = irq->u.pgm;
+	}
+	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
+	return 0;
+}
+
+static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_pfault_init++;
+	VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
+		   irq->u.ext.ext_params2);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
+				   irq->u.ext.ext_params,
+				   irq->u.ext.ext_params2);
+
+	li->irq.ext = irq->u.ext;
+	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	return 0;
+}
+
+static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
+	uint16_t src_id = irq->u.extcall.code;
+
+	vcpu->stat.inject_external_call++;
+	VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
+		   src_id);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
+				   src_id, 0);
+
+	/* sending vcpu invalid */
+	if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
+		return -EINVAL;
+
+	if (sclp.has_sigpif)
+		return sca_inject_ext_call(vcpu, src_id);
+
+	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
+		return -EBUSY;
+	*extcall = irq->u.extcall;
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	return 0;
+}
+
+static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
+
+	vcpu->stat.inject_set_prefix++;
+	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
+		   irq->u.prefix.address);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
+				   irq->u.prefix.address, 0);
+
+	if (!is_vcpu_stopped(vcpu))
+		return -EBUSY;
+
+	*prefix = irq->u.prefix;
+	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
+	return 0;
+}
+
+#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
+static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_stop_info *stop = &li->irq.stop;
+	int rc = 0;
+
+	vcpu->stat.inject_stop_signal++;
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
+
+	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
+		return -EINVAL;
+
+	if (is_vcpu_stopped(vcpu)) {
+		if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
+			rc = kvm_s390_store_status_unloaded(vcpu,
+						KVM_S390_STORE_STATUS_NOADDR);
+		return rc;
+	}
+
+	if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
+		return -EBUSY;
+	stop->flags = irq->u.stop.flags;
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
+	return 0;
+}
+
+static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
+				 struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_restart++;
+	VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
+
+	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+	return 0;
+}
+
+static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
+				   struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_emergency_signal++;
+	VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
+		   irq->u.emerg.code);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
+				   irq->u.emerg.code, 0);
+
+	/* sending vcpu invalid */
+	if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
+		return -EINVAL;
+
+	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
+	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	return 0;
+}
+
+static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
+
+	vcpu->stat.inject_mchk++;
+	VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
+		   irq->u.mchk.mcic);
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
+				   irq->u.mchk.mcic);
+
+	/*
+	 * Because repressible machine checks can be indicated along with
+	 * exigent machine checks (PoP, Chapter 11, Interruption action)
+	 * we need to combine cr14, mcic and external damage code.
+	 * Failing storage address and the logout area should not be or'ed
+	 * together, we just indicate the last occurrence of the corresponding
+	 * machine check
+	 */
+	mchk->cr14 |= irq->u.mchk.cr14;
+	mchk->mcic |= irq->u.mchk.mcic;
+	mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
+	mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
+	memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
+	       sizeof(mchk->fixed_logout));
+	if (mchk->mcic & MCHK_EX_MASK)
+		set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
+	else if (mchk->mcic & MCHK_REP_MASK)
+		set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
+	return 0;
+}
+
+static int __inject_ckc(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_ckc++;
+	VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
+				   0, 0);
+
+	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	return 0;
+}
+
+static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	vcpu->stat.inject_cputm++;
+	VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
+	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
+				   0, 0);
+
+	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+	kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
+	return 0;
+}
+
+static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
+						  int isc, u32 schid)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
+	struct kvm_s390_interrupt_info *iter;
+	u16 id = (schid & 0xffff0000U) >> 16;
+	u16 nr = schid & 0x0000ffffU;
+
+	spin_lock(&fi->lock);
+	list_for_each_entry(iter, isc_list, list) {
+		if (schid && (id != iter->io.subchannel_id ||
+			      nr != iter->io.subchannel_nr))
+			continue;
+		/* found an appropriate entry */
+		list_del_init(&iter->list);
+		fi->counters[FIRQ_CNTR_IO] -= 1;
+		if (list_empty(isc_list))
+			clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
+		spin_unlock(&fi->lock);
+		return iter;
+	}
+	spin_unlock(&fi->lock);
+	return NULL;
+}
+
+static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
+						      u64 isc_mask, u32 schid)
+{
+	struct kvm_s390_interrupt_info *inti = NULL;
+	int isc;
+
+	for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
+		if (isc_mask & isc_to_isc_bits(isc))
+			inti = get_io_int(kvm, isc, schid);
+	}
+	return inti;
+}
+
+static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
+{
+	unsigned long active_mask;
+	int isc;
+
+	if (schid)
+		goto out;
+	if (!kvm->arch.gisa)
+		goto out;
+
+	active_mask = (isc_mask & kvm_s390_gisa_get_ipm(kvm->arch.gisa) << 24) << 32;
+	while (active_mask) {
+		isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
+		if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, isc))
+			return isc;
+		clear_bit_inv(isc, &active_mask);
+	}
+out:
+	return -EINVAL;
+}
+
+/*
+ * Dequeue and return an I/O interrupt matching any of the interruption
+ * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
+ * Take into account the interrupts pending in the interrupt list and in GISA.
+ *
+ * Note that for a guest that does not enable I/O interrupts
+ * but relies on TPI, a flood of classic interrupts may starve
+ * out adapter interrupts on the same isc. Linux does not do
+ * that, and it is possible to work around the issue by configuring
+ * different iscs for classic and adapter interrupts in the guest,
+ * but we may want to revisit this in the future.
+ */
+struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
+						    u64 isc_mask, u32 schid)
+{
+	struct kvm_s390_interrupt_info *inti, *tmp_inti;
+	int isc;
+
+	inti = get_top_io_int(kvm, isc_mask, schid);
+
+	isc = get_top_gisa_isc(kvm, isc_mask, schid);
+	if (isc < 0)
+		/* no AI in GISA */
+		goto out;
+
+	if (!inti)
+		/* AI in GISA but no classical IO int */
+		goto gisa_out;
+
+	/* both types of interrupts present */
+	if (int_word_to_isc(inti->io.io_int_word) <= isc) {
+		/* classical IO int with higher priority */
+		kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
+		goto out;
+	}
+gisa_out:
+	tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL);
+	if (tmp_inti) {
+		tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
+		tmp_inti->io.io_int_word = isc_to_int_word(isc);
+		if (inti)
+			kvm_s390_reinject_io_int(kvm, inti);
+		inti = tmp_inti;
+	} else
+		kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
+out:
+	return inti;
+}
+
+#define SCCB_MASK 0xFFFFFFF8
+#define SCCB_EVENT_PENDING 0x3
+
+static int __inject_service(struct kvm *kvm,
+			     struct kvm_s390_interrupt_info *inti)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+	kvm->stat.inject_service_signal++;
+	spin_lock(&fi->lock);
+	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
+	/*
+	 * Early versions of the QEMU s390 bios will inject several
+	 * service interrupts after another without handling a
+	 * condition code indicating busy.
+	 * We will silently ignore those superfluous sccb values.
+	 * A future version of QEMU will take care of serialization
+	 * of servc requests
+	 */
+	if (fi->srv_signal.ext_params & SCCB_MASK)
+		goto out;
+	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
+	set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
+out:
+	spin_unlock(&fi->lock);
+	kfree(inti);
+	return 0;
+}
+
+static int __inject_virtio(struct kvm *kvm,
+			    struct kvm_s390_interrupt_info *inti)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+	kvm->stat.inject_virtio++;
+	spin_lock(&fi->lock);
+	if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
+		spin_unlock(&fi->lock);
+		return -EBUSY;
+	}
+	fi->counters[FIRQ_CNTR_VIRTIO] += 1;
+	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
+	set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+	return 0;
+}
+
+static int __inject_pfault_done(struct kvm *kvm,
+				 struct kvm_s390_interrupt_info *inti)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+	kvm->stat.inject_pfault_done++;
+	spin_lock(&fi->lock);
+	if (fi->counters[FIRQ_CNTR_PFAULT] >=
+		(ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
+		spin_unlock(&fi->lock);
+		return -EBUSY;
+	}
+	fi->counters[FIRQ_CNTR_PFAULT] += 1;
+	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
+	set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+	return 0;
+}
+
+#define CR_PENDING_SUBCLASS 28
+static int __inject_float_mchk(struct kvm *kvm,
+				struct kvm_s390_interrupt_info *inti)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+
+	kvm->stat.inject_float_mchk++;
+	spin_lock(&fi->lock);
+	fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
+	fi->mchk.mcic |= inti->mchk.mcic;
+	set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+	kfree(inti);
+	return 0;
+}
+
+static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
+{
+	struct kvm_s390_float_interrupt *fi;
+	struct list_head *list;
+	int isc;
+
+	kvm->stat.inject_io++;
+	isc = int_word_to_isc(inti->io.io_int_word);
+
+	if (kvm->arch.gisa && inti->type & KVM_S390_INT_IO_AI_MASK) {
+		VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
+		kvm_s390_gisa_set_ipm_gisc(kvm->arch.gisa, isc);
+		kfree(inti);
+		return 0;
+	}
+
+	fi = &kvm->arch.float_int;
+	spin_lock(&fi->lock);
+	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
+		spin_unlock(&fi->lock);
+		return -EBUSY;
+	}
+	fi->counters[FIRQ_CNTR_IO] += 1;
+
+	if (inti->type & KVM_S390_INT_IO_AI_MASK)
+		VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
+	else
+		VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
+			inti->io.subchannel_id >> 8,
+			inti->io.subchannel_id >> 1 & 0x3,
+			inti->io.subchannel_nr);
+	list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
+	list_add_tail(&inti->list, list);
+	set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
+	spin_unlock(&fi->lock);
+	return 0;
+}
+
+/*
+ * Find a destination VCPU for a floating irq and kick it.
+ */
+static void __floating_irq_kick(struct kvm *kvm, u64 type)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct kvm_vcpu *dst_vcpu;
+	int sigcpu, online_vcpus, nr_tries = 0;
+
+	online_vcpus = atomic_read(&kvm->online_vcpus);
+	if (!online_vcpus)
+		return;
+
+	/* find idle VCPUs first, then round robin */
+	sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
+	if (sigcpu == online_vcpus) {
+		do {
+			sigcpu = fi->next_rr_cpu;
+			fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
+			/* avoid endless loops if all vcpus are stopped */
+			if (nr_tries++ >= online_vcpus)
+				return;
+		} while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
+	}
+	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
+
+	/* make the VCPU drop out of the SIE, or wake it up if sleeping */
+	switch (type) {
+	case KVM_S390_MCHK:
+		kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
+		break;
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+		if (!(type & KVM_S390_INT_IO_AI_MASK && kvm->arch.gisa))
+			kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
+		break;
+	default:
+		kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
+		break;
+	}
+	kvm_s390_vcpu_wakeup(dst_vcpu);
+}
+
+static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
+{
+	u64 type = READ_ONCE(inti->type);
+	int rc;
+
+	switch (type) {
+	case KVM_S390_MCHK:
+		rc = __inject_float_mchk(kvm, inti);
+		break;
+	case KVM_S390_INT_VIRTIO:
+		rc = __inject_virtio(kvm, inti);
+		break;
+	case KVM_S390_INT_SERVICE:
+		rc = __inject_service(kvm, inti);
+		break;
+	case KVM_S390_INT_PFAULT_DONE:
+		rc = __inject_pfault_done(kvm, inti);
+		break;
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+		rc = __inject_io(kvm, inti);
+		break;
+	default:
+		rc = -EINVAL;
+	}
+	if (rc)
+		return rc;
+
+	__floating_irq_kick(kvm, type);
+	return 0;
+}
+
+int kvm_s390_inject_vm(struct kvm *kvm,
+		       struct kvm_s390_interrupt *s390int)
+{
+	struct kvm_s390_interrupt_info *inti;
+	int rc;
+
+	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
+	if (!inti)
+		return -ENOMEM;
+
+	inti->type = s390int->type;
+	switch (inti->type) {
+	case KVM_S390_INT_VIRTIO:
+		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
+			 s390int->parm, s390int->parm64);
+		inti->ext.ext_params = s390int->parm;
+		inti->ext.ext_params2 = s390int->parm64;
+		break;
+	case KVM_S390_INT_SERVICE:
+		VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
+		inti->ext.ext_params = s390int->parm;
+		break;
+	case KVM_S390_INT_PFAULT_DONE:
+		inti->ext.ext_params2 = s390int->parm64;
+		break;
+	case KVM_S390_MCHK:
+		VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
+			 s390int->parm64);
+		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
+		inti->mchk.mcic = s390int->parm64;
+		break;
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+		inti->io.subchannel_id = s390int->parm >> 16;
+		inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
+		inti->io.io_int_parm = s390int->parm64 >> 32;
+		inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
+		break;
+	default:
+		kfree(inti);
+		return -EINVAL;
+	}
+	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
+				 2);
+
+	rc = __inject_vm(kvm, inti);
+	if (rc)
+		kfree(inti);
+	return rc;
+}
+
+int kvm_s390_reinject_io_int(struct kvm *kvm,
+			      struct kvm_s390_interrupt_info *inti)
+{
+	return __inject_vm(kvm, inti);
+}
+
+int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
+		       struct kvm_s390_irq *irq)
+{
+	irq->type = s390int->type;
+	switch (irq->type) {
+	case KVM_S390_PROGRAM_INT:
+		if (s390int->parm & 0xffff0000)
+			return -EINVAL;
+		irq->u.pgm.code = s390int->parm;
+		break;
+	case KVM_S390_SIGP_SET_PREFIX:
+		irq->u.prefix.address = s390int->parm;
+		break;
+	case KVM_S390_SIGP_STOP:
+		irq->u.stop.flags = s390int->parm;
+		break;
+	case KVM_S390_INT_EXTERNAL_CALL:
+		if (s390int->parm & 0xffff0000)
+			return -EINVAL;
+		irq->u.extcall.code = s390int->parm;
+		break;
+	case KVM_S390_INT_EMERGENCY:
+		if (s390int->parm & 0xffff0000)
+			return -EINVAL;
+		irq->u.emerg.code = s390int->parm;
+		break;
+	case KVM_S390_MCHK:
+		irq->u.mchk.mcic = s390int->parm64;
+		break;
+	case KVM_S390_INT_PFAULT_INIT:
+		irq->u.ext.ext_params = s390int->parm;
+		irq->u.ext.ext_params2 = s390int->parm64;
+		break;
+	case KVM_S390_RESTART:
+	case KVM_S390_INT_CLOCK_COMP:
+	case KVM_S390_INT_CPU_TIMER:
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
+}
+
+int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	return test_bit(IRQ_PEND_RESTART, &li->pending_irqs);
+}
+
+void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+
+	spin_lock(&li->lock);
+	li->irq.stop.flags = 0;
+	clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
+	spin_unlock(&li->lock);
+}
+
+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	int rc;
+
+	switch (irq->type) {
+	case KVM_S390_PROGRAM_INT:
+		rc = __inject_prog(vcpu, irq);
+		break;
+	case KVM_S390_SIGP_SET_PREFIX:
+		rc = __inject_set_prefix(vcpu, irq);
+		break;
+	case KVM_S390_SIGP_STOP:
+		rc = __inject_sigp_stop(vcpu, irq);
+		break;
+	case KVM_S390_RESTART:
+		rc = __inject_sigp_restart(vcpu, irq);
+		break;
+	case KVM_S390_INT_CLOCK_COMP:
+		rc = __inject_ckc(vcpu);
+		break;
+	case KVM_S390_INT_CPU_TIMER:
+		rc = __inject_cpu_timer(vcpu);
+		break;
+	case KVM_S390_INT_EXTERNAL_CALL:
+		rc = __inject_extcall(vcpu, irq);
+		break;
+	case KVM_S390_INT_EMERGENCY:
+		rc = __inject_sigp_emergency(vcpu, irq);
+		break;
+	case KVM_S390_MCHK:
+		rc = __inject_mchk(vcpu, irq);
+		break;
+	case KVM_S390_INT_PFAULT_INIT:
+		rc = __inject_pfault_init(vcpu, irq);
+		break;
+	case KVM_S390_INT_VIRTIO:
+	case KVM_S390_INT_SERVICE:
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+	default:
+		rc = -EINVAL;
+	}
+
+	return rc;
+}
+
+int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	int rc;
+
+	spin_lock(&li->lock);
+	rc = do_inject_vcpu(vcpu, irq);
+	spin_unlock(&li->lock);
+	if (!rc)
+		kvm_s390_vcpu_wakeup(vcpu);
+	return rc;
+}
+
+static inline void clear_irq_list(struct list_head *_list)
+{
+	struct kvm_s390_interrupt_info *inti, *n;
+
+	list_for_each_entry_safe(inti, n, _list, list) {
+		list_del(&inti->list);
+		kfree(inti);
+	}
+}
+
+static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
+		       struct kvm_s390_irq *irq)
+{
+	irq->type = inti->type;
+	switch (inti->type) {
+	case KVM_S390_INT_PFAULT_INIT:
+	case KVM_S390_INT_PFAULT_DONE:
+	case KVM_S390_INT_VIRTIO:
+		irq->u.ext = inti->ext;
+		break;
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+		irq->u.io = inti->io;
+		break;
+	}
+}
+
+void kvm_s390_clear_float_irqs(struct kvm *kvm)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	int i;
+
+	spin_lock(&fi->lock);
+	fi->pending_irqs = 0;
+	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
+	memset(&fi->mchk, 0, sizeof(fi->mchk));
+	for (i = 0; i < FIRQ_LIST_COUNT; i++)
+		clear_irq_list(&fi->lists[i]);
+	for (i = 0; i < FIRQ_MAX_COUNT; i++)
+		fi->counters[i] = 0;
+	spin_unlock(&fi->lock);
+	kvm_s390_gisa_clear(kvm);
+};
+
+static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
+{
+	struct kvm_s390_interrupt_info *inti;
+	struct kvm_s390_float_interrupt *fi;
+	struct kvm_s390_irq *buf;
+	struct kvm_s390_irq *irq;
+	int max_irqs;
+	int ret = 0;
+	int n = 0;
+	int i;
+
+	if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
+		return -EINVAL;
+
+	/*
+	 * We are already using -ENOMEM to signal
+	 * userspace it may retry with a bigger buffer,
+	 * so we need to use something else for this case
+	 */
+	buf = vzalloc(len);
+	if (!buf)
+		return -ENOBUFS;
+
+	max_irqs = len / sizeof(struct kvm_s390_irq);
+
+	if (kvm->arch.gisa &&
+	    kvm_s390_gisa_get_ipm(kvm->arch.gisa)) {
+		for (i = 0; i <= MAX_ISC; i++) {
+			if (n == max_irqs) {
+				/* signal userspace to try again */
+				ret = -ENOMEM;
+				goto out_nolock;
+			}
+			if (kvm_s390_gisa_tac_ipm_gisc(kvm->arch.gisa, i)) {
+				irq = (struct kvm_s390_irq *) &buf[n];
+				irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
+				irq->u.io.io_int_word = isc_to_int_word(i);
+				n++;
+			}
+		}
+	}
+	fi = &kvm->arch.float_int;
+	spin_lock(&fi->lock);
+	for (i = 0; i < FIRQ_LIST_COUNT; i++) {
+		list_for_each_entry(inti, &fi->lists[i], list) {
+			if (n == max_irqs) {
+				/* signal userspace to try again */
+				ret = -ENOMEM;
+				goto out;
+			}
+			inti_to_irq(inti, &buf[n]);
+			n++;
+		}
+	}
+	if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
+		if (n == max_irqs) {
+			/* signal userspace to try again */
+			ret = -ENOMEM;
+			goto out;
+		}
+		irq = (struct kvm_s390_irq *) &buf[n];
+		irq->type = KVM_S390_INT_SERVICE;
+		irq->u.ext = fi->srv_signal;
+		n++;
+	}
+	if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
+		if (n == max_irqs) {
+				/* signal userspace to try again */
+				ret = -ENOMEM;
+				goto out;
+		}
+		irq = (struct kvm_s390_irq *) &buf[n];
+		irq->type = KVM_S390_MCHK;
+		irq->u.mchk = fi->mchk;
+		n++;
+}
+
+out:
+	spin_unlock(&fi->lock);
+out_nolock:
+	if (!ret && n > 0) {
+		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
+			ret = -EFAULT;
+	}
+	vfree(buf);
+
+	return ret < 0 ? ret : n;
+}
+
+static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct kvm_s390_ais_all ais;
+
+	if (attr->attr < sizeof(ais))
+		return -EINVAL;
+
+	if (!test_kvm_facility(kvm, 72))
+		return -EOPNOTSUPP;
+
+	mutex_lock(&fi->ais_lock);
+	ais.simm = fi->simm;
+	ais.nimm = fi->nimm;
+	mutex_unlock(&fi->ais_lock);
+
+	if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	int r;
+
+	switch (attr->group) {
+	case KVM_DEV_FLIC_GET_ALL_IRQS:
+		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
+					  attr->attr);
+		break;
+	case KVM_DEV_FLIC_AISM_ALL:
+		r = flic_ais_mode_get_all(dev->kvm, attr);
+		break;
+	default:
+		r = -EINVAL;
+	}
+
+	return r;
+}
+
+static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
+				     u64 addr)
+{
+	struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
+	void *target = NULL;
+	void __user *source;
+	u64 size;
+
+	if (get_user(inti->type, (u64 __user *)addr))
+		return -EFAULT;
+
+	switch (inti->type) {
+	case KVM_S390_INT_PFAULT_INIT:
+	case KVM_S390_INT_PFAULT_DONE:
+	case KVM_S390_INT_VIRTIO:
+	case KVM_S390_INT_SERVICE:
+		target = (void *) &inti->ext;
+		source = &uptr->u.ext;
+		size = sizeof(inti->ext);
+		break;
+	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
+		target = (void *) &inti->io;
+		source = &uptr->u.io;
+		size = sizeof(inti->io);
+		break;
+	case KVM_S390_MCHK:
+		target = (void *) &inti->mchk;
+		source = &uptr->u.mchk;
+		size = sizeof(inti->mchk);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (copy_from_user(target, source, size))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int enqueue_floating_irq(struct kvm_device *dev,
+				struct kvm_device_attr *attr)
+{
+	struct kvm_s390_interrupt_info *inti = NULL;
+	int r = 0;
+	int len = attr->attr;
+
+	if (len % sizeof(struct kvm_s390_irq) != 0)
+		return -EINVAL;
+	else if (len > KVM_S390_FLIC_MAX_BUFFER)
+		return -EINVAL;
+
+	while (len >= sizeof(struct kvm_s390_irq)) {
+		inti = kzalloc(sizeof(*inti), GFP_KERNEL);
+		if (!inti)
+			return -ENOMEM;
+
+		r = copy_irq_from_user(inti, attr->addr);
+		if (r) {
+			kfree(inti);
+			return r;
+		}
+		r = __inject_vm(dev->kvm, inti);
+		if (r) {
+			kfree(inti);
+			return r;
+		}
+		len -= sizeof(struct kvm_s390_irq);
+		attr->addr += sizeof(struct kvm_s390_irq);
+	}
+
+	return r;
+}
+
+static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
+{
+	if (id >= MAX_S390_IO_ADAPTERS)
+		return NULL;
+	return kvm->arch.adapters[id];
+}
+
+static int register_io_adapter(struct kvm_device *dev,
+			       struct kvm_device_attr *attr)
+{
+	struct s390_io_adapter *adapter;
+	struct kvm_s390_io_adapter adapter_info;
+
+	if (copy_from_user(&adapter_info,
+			   (void __user *)attr->addr, sizeof(adapter_info)))
+		return -EFAULT;
+
+	if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
+	    (dev->kvm->arch.adapters[adapter_info.id] != NULL))
+		return -EINVAL;
+
+	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
+	if (!adapter)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&adapter->maps);
+	init_rwsem(&adapter->maps_lock);
+	atomic_set(&adapter->nr_maps, 0);
+	adapter->id = adapter_info.id;
+	adapter->isc = adapter_info.isc;
+	adapter->maskable = adapter_info.maskable;
+	adapter->masked = false;
+	adapter->swap = adapter_info.swap;
+	adapter->suppressible = (adapter_info.flags) &
+				KVM_S390_ADAPTER_SUPPRESSIBLE;
+	dev->kvm->arch.adapters[adapter->id] = adapter;
+
+	return 0;
+}
+
+int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
+{
+	int ret;
+	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+
+	if (!adapter || !adapter->maskable)
+		return -EINVAL;
+	ret = adapter->masked;
+	adapter->masked = masked;
+	return ret;
+}
+
+static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
+{
+	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+	struct s390_map_info *map;
+	int ret;
+
+	if (!adapter || !addr)
+		return -EINVAL;
+
+	map = kzalloc(sizeof(*map), GFP_KERNEL);
+	if (!map) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	INIT_LIST_HEAD(&map->list);
+	map->guest_addr = addr;
+	map->addr = gmap_translate(kvm->arch.gmap, addr);
+	if (map->addr == -EFAULT) {
+		ret = -EFAULT;
+		goto out;
+	}
+	ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
+	if (ret < 0)
+		goto out;
+	BUG_ON(ret != 1);
+	down_write(&adapter->maps_lock);
+	if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
+		list_add_tail(&map->list, &adapter->maps);
+		ret = 0;
+	} else {
+		put_page(map->page);
+		ret = -EINVAL;
+	}
+	up_write(&adapter->maps_lock);
+out:
+	if (ret)
+		kfree(map);
+	return ret;
+}
+
+static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
+{
+	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+	struct s390_map_info *map, *tmp;
+	int found = 0;
+
+	if (!adapter || !addr)
+		return -EINVAL;
+
+	down_write(&adapter->maps_lock);
+	list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
+		if (map->guest_addr == addr) {
+			found = 1;
+			atomic_dec(&adapter->nr_maps);
+			list_del(&map->list);
+			put_page(map->page);
+			kfree(map);
+			break;
+		}
+	}
+	up_write(&adapter->maps_lock);
+
+	return found ? 0 : -EINVAL;
+}
+
+void kvm_s390_destroy_adapters(struct kvm *kvm)
+{
+	int i;
+	struct s390_map_info *map, *tmp;
+
+	for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
+		if (!kvm->arch.adapters[i])
+			continue;
+		list_for_each_entry_safe(map, tmp,
+					 &kvm->arch.adapters[i]->maps, list) {
+			list_del(&map->list);
+			put_page(map->page);
+			kfree(map);
+		}
+		kfree(kvm->arch.adapters[i]);
+	}
+}
+
+static int modify_io_adapter(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	struct kvm_s390_io_adapter_req req;
+	struct s390_io_adapter *adapter;
+	int ret;
+
+	if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
+		return -EFAULT;
+
+	adapter = get_io_adapter(dev->kvm, req.id);
+	if (!adapter)
+		return -EINVAL;
+	switch (req.type) {
+	case KVM_S390_IO_ADAPTER_MASK:
+		ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
+		if (ret > 0)
+			ret = 0;
+		break;
+	case KVM_S390_IO_ADAPTER_MAP:
+		ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
+		break;
+	case KVM_S390_IO_ADAPTER_UNMAP:
+		ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
+
+{
+	const u64 isc_mask = 0xffUL << 24; /* all iscs set */
+	u32 schid;
+
+	if (attr->flags)
+		return -EINVAL;
+	if (attr->attr != sizeof(schid))
+		return -EINVAL;
+	if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
+		return -EFAULT;
+	if (!schid)
+		return -EINVAL;
+	kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
+	/*
+	 * If userspace is conforming to the architecture, we can have at most
+	 * one pending I/O interrupt per subchannel, so this is effectively a
+	 * clear all.
+	 */
+	return 0;
+}
+
+static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct kvm_s390_ais_req req;
+	int ret = 0;
+
+	if (!test_kvm_facility(kvm, 72))
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
+		return -EFAULT;
+
+	if (req.isc > MAX_ISC)
+		return -EINVAL;
+
+	trace_kvm_s390_modify_ais_mode(req.isc,
+				       (fi->simm & AIS_MODE_MASK(req.isc)) ?
+				       (fi->nimm & AIS_MODE_MASK(req.isc)) ?
+				       2 : KVM_S390_AIS_MODE_SINGLE :
+				       KVM_S390_AIS_MODE_ALL, req.mode);
+
+	mutex_lock(&fi->ais_lock);
+	switch (req.mode) {
+	case KVM_S390_AIS_MODE_ALL:
+		fi->simm &= ~AIS_MODE_MASK(req.isc);
+		fi->nimm &= ~AIS_MODE_MASK(req.isc);
+		break;
+	case KVM_S390_AIS_MODE_SINGLE:
+		fi->simm |= AIS_MODE_MASK(req.isc);
+		fi->nimm &= ~AIS_MODE_MASK(req.isc);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&fi->ais_lock);
+
+	return ret;
+}
+
+static int kvm_s390_inject_airq(struct kvm *kvm,
+				struct s390_io_adapter *adapter)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct kvm_s390_interrupt s390int = {
+		.type = KVM_S390_INT_IO(1, 0, 0, 0),
+		.parm = 0,
+		.parm64 = isc_to_int_word(adapter->isc),
+	};
+	int ret = 0;
+
+	if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
+		return kvm_s390_inject_vm(kvm, &s390int);
+
+	mutex_lock(&fi->ais_lock);
+	if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
+		trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
+		goto out;
+	}
+
+	ret = kvm_s390_inject_vm(kvm, &s390int);
+	if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
+		fi->nimm |= AIS_MODE_MASK(adapter->isc);
+		trace_kvm_s390_modify_ais_mode(adapter->isc,
+					       KVM_S390_AIS_MODE_SINGLE, 2);
+	}
+out:
+	mutex_unlock(&fi->ais_lock);
+	return ret;
+}
+
+static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+	unsigned int id = attr->attr;
+	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
+
+	if (!adapter)
+		return -EINVAL;
+
+	return kvm_s390_inject_airq(kvm, adapter);
+}
+
+static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
+	struct kvm_s390_ais_all ais;
+
+	if (!test_kvm_facility(kvm, 72))
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
+		return -EFAULT;
+
+	mutex_lock(&fi->ais_lock);
+	fi->simm = ais.simm;
+	fi->nimm = ais.nimm;
+	mutex_unlock(&fi->ais_lock);
+
+	return 0;
+}
+
+static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	int r = 0;
+	unsigned int i;
+	struct kvm_vcpu *vcpu;
+
+	switch (attr->group) {
+	case KVM_DEV_FLIC_ENQUEUE:
+		r = enqueue_floating_irq(dev, attr);
+		break;
+	case KVM_DEV_FLIC_CLEAR_IRQS:
+		kvm_s390_clear_float_irqs(dev->kvm);
+		break;
+	case KVM_DEV_FLIC_APF_ENABLE:
+		dev->kvm->arch.gmap->pfault_enabled = 1;
+		break;
+	case KVM_DEV_FLIC_APF_DISABLE_WAIT:
+		dev->kvm->arch.gmap->pfault_enabled = 0;
+		/*
+		 * Make sure no async faults are in transition when
+		 * clearing the queues. So we don't need to worry
+		 * about late coming workers.
+		 */
+		synchronize_srcu(&dev->kvm->srcu);
+		kvm_for_each_vcpu(i, vcpu, dev->kvm)
+			kvm_clear_async_pf_completion_queue(vcpu);
+		break;
+	case KVM_DEV_FLIC_ADAPTER_REGISTER:
+		r = register_io_adapter(dev, attr);
+		break;
+	case KVM_DEV_FLIC_ADAPTER_MODIFY:
+		r = modify_io_adapter(dev, attr);
+		break;
+	case KVM_DEV_FLIC_CLEAR_IO_IRQ:
+		r = clear_io_irq(dev->kvm, attr);
+		break;
+	case KVM_DEV_FLIC_AISM:
+		r = modify_ais_mode(dev->kvm, attr);
+		break;
+	case KVM_DEV_FLIC_AIRQ_INJECT:
+		r = flic_inject_airq(dev->kvm, attr);
+		break;
+	case KVM_DEV_FLIC_AISM_ALL:
+		r = flic_ais_mode_set_all(dev->kvm, attr);
+		break;
+	default:
+		r = -EINVAL;
+	}
+
+	return r;
+}
+
+static int flic_has_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_FLIC_GET_ALL_IRQS:
+	case KVM_DEV_FLIC_ENQUEUE:
+	case KVM_DEV_FLIC_CLEAR_IRQS:
+	case KVM_DEV_FLIC_APF_ENABLE:
+	case KVM_DEV_FLIC_APF_DISABLE_WAIT:
+	case KVM_DEV_FLIC_ADAPTER_REGISTER:
+	case KVM_DEV_FLIC_ADAPTER_MODIFY:
+	case KVM_DEV_FLIC_CLEAR_IO_IRQ:
+	case KVM_DEV_FLIC_AISM:
+	case KVM_DEV_FLIC_AIRQ_INJECT:
+	case KVM_DEV_FLIC_AISM_ALL:
+		return 0;
+	}
+	return -ENXIO;
+}
+
+static int flic_create(struct kvm_device *dev, u32 type)
+{
+	if (!dev)
+		return -EINVAL;
+	if (dev->kvm->arch.flic)
+		return -EINVAL;
+	dev->kvm->arch.flic = dev;
+	return 0;
+}
+
+static void flic_destroy(struct kvm_device *dev)
+{
+	dev->kvm->arch.flic = NULL;
+	kfree(dev);
+}
+
+/* s390 floating irq controller (flic) */
+struct kvm_device_ops kvm_flic_ops = {
+	.name = "kvm-flic",
+	.get_attr = flic_get_attr,
+	.set_attr = flic_set_attr,
+	.has_attr = flic_has_attr,
+	.create = flic_create,
+	.destroy = flic_destroy,
+};
+
+static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
+{
+	unsigned long bit;
+
+	bit = bit_nr + (addr % PAGE_SIZE) * 8;
+
+	return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
+}
+
+static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
+					  u64 addr)
+{
+	struct s390_map_info *map;
+
+	if (!adapter)
+		return NULL;
+
+	list_for_each_entry(map, &adapter->maps, list) {
+		if (map->guest_addr == addr)
+			return map;
+	}
+	return NULL;
+}
+
+static int adapter_indicators_set(struct kvm *kvm,
+				  struct s390_io_adapter *adapter,
+				  struct kvm_s390_adapter_int *adapter_int)
+{
+	unsigned long bit;
+	int summary_set, idx;
+	struct s390_map_info *info;
+	void *map;
+
+	info = get_map_info(adapter, adapter_int->ind_addr);
+	if (!info)
+		return -1;
+	map = page_address(info->page);
+	bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
+	set_bit(bit, map);
+	idx = srcu_read_lock(&kvm->srcu);
+	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
+	set_page_dirty_lock(info->page);
+	info = get_map_info(adapter, adapter_int->summary_addr);
+	if (!info) {
+		srcu_read_unlock(&kvm->srcu, idx);
+		return -1;
+	}
+	map = page_address(info->page);
+	bit = get_ind_bit(info->addr, adapter_int->summary_offset,
+			  adapter->swap);
+	summary_set = test_and_set_bit(bit, map);
+	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
+	set_page_dirty_lock(info->page);
+	srcu_read_unlock(&kvm->srcu, idx);
+	return summary_set ? 0 : 1;
+}
+
+/*
+ * < 0 - not injected due to error
+ * = 0 - coalesced, summary indicator already active
+ * > 0 - injected interrupt
+ */
+static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
+			   struct kvm *kvm, int irq_source_id, int level,
+			   bool line_status)
+{
+	int ret;
+	struct s390_io_adapter *adapter;
+
+	/* We're only interested in the 0->1 transition. */
+	if (!level)
+		return 0;
+	adapter = get_io_adapter(kvm, e->adapter.adapter_id);
+	if (!adapter)
+		return -1;
+	down_read(&adapter->maps_lock);
+	ret = adapter_indicators_set(kvm, adapter, &e->adapter);
+	up_read(&adapter->maps_lock);
+	if ((ret > 0) && !adapter->masked) {
+		ret = kvm_s390_inject_airq(kvm, adapter);
+		if (ret == 0)
+			ret = 1;
+	}
+	return ret;
+}
+
+/*
+ * Inject the machine check to the guest.
+ */
+void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
+				     struct mcck_volatile_info *mcck_info)
+{
+	struct kvm_s390_interrupt_info inti;
+	struct kvm_s390_irq irq;
+	struct kvm_s390_mchk_info *mchk;
+	union mci mci;
+	__u64 cr14 = 0;         /* upper bits are not used */
+	int rc;
+
+	mci.val = mcck_info->mcic;
+	if (mci.sr)
+		cr14 |= CR14_RECOVERY_SUBMASK;
+	if (mci.dg)
+		cr14 |= CR14_DEGRADATION_SUBMASK;
+	if (mci.w)
+		cr14 |= CR14_WARNING_SUBMASK;
+
+	mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
+	mchk->cr14 = cr14;
+	mchk->mcic = mcck_info->mcic;
+	mchk->ext_damage_code = mcck_info->ext_damage_code;
+	mchk->failing_storage_address = mcck_info->failing_storage_address;
+	if (mci.ck) {
+		/* Inject the floating machine check */
+		inti.type = KVM_S390_MCHK;
+		rc = __inject_vm(vcpu->kvm, &inti);
+	} else {
+		/* Inject the machine check to specified vcpu */
+		irq.type = KVM_S390_MCHK;
+		rc = kvm_s390_inject_vcpu(vcpu, &irq);
+	}
+	WARN_ON_ONCE(rc);
+}
+
+int kvm_set_routing_entry(struct kvm *kvm,
+			  struct kvm_kernel_irq_routing_entry *e,
+			  const struct kvm_irq_routing_entry *ue)
+{
+	int ret;
+
+	switch (ue->type) {
+	case KVM_IRQ_ROUTING_S390_ADAPTER:
+		e->set = set_adapter_int;
+		e->adapter.summary_addr = ue->u.adapter.summary_addr;
+		e->adapter.ind_addr = ue->u.adapter.ind_addr;
+		e->adapter.summary_offset = ue->u.adapter.summary_offset;
+		e->adapter.ind_offset = ue->u.adapter.ind_offset;
+		e->adapter.adapter_id = ue->u.adapter.adapter_id;
+		ret = 0;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
+		int irq_source_id, int level, bool line_status)
+{
+	return -EINVAL;
+}
+
+int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
+{
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	struct kvm_s390_irq *buf;
+	int r = 0;
+	int n;
+
+	buf = vmalloc(len);
+	if (!buf)
+		return -ENOMEM;
+
+	if (copy_from_user((void *) buf, irqstate, len)) {
+		r = -EFAULT;
+		goto out_free;
+	}
+
+	/*
+	 * Don't allow setting the interrupt state
+	 * when there are already interrupts pending
+	 */
+	spin_lock(&li->lock);
+	if (li->pending_irqs) {
+		r = -EBUSY;
+		goto out_unlock;
+	}
+
+	for (n = 0; n < len / sizeof(*buf); n++) {
+		r = do_inject_vcpu(vcpu, &buf[n]);
+		if (r)
+			break;
+	}
+
+out_unlock:
+	spin_unlock(&li->lock);
+out_free:
+	vfree(buf);
+
+	return r;
+}
+
+static void store_local_irq(struct kvm_s390_local_interrupt *li,
+			    struct kvm_s390_irq *irq,
+			    unsigned long irq_type)
+{
+	switch (irq_type) {
+	case IRQ_PEND_MCHK_EX:
+	case IRQ_PEND_MCHK_REP:
+		irq->type = KVM_S390_MCHK;
+		irq->u.mchk = li->irq.mchk;
+		break;
+	case IRQ_PEND_PROG:
+		irq->type = KVM_S390_PROGRAM_INT;
+		irq->u.pgm = li->irq.pgm;
+		break;
+	case IRQ_PEND_PFAULT_INIT:
+		irq->type = KVM_S390_INT_PFAULT_INIT;
+		irq->u.ext = li->irq.ext;
+		break;
+	case IRQ_PEND_EXT_EXTERNAL:
+		irq->type = KVM_S390_INT_EXTERNAL_CALL;
+		irq->u.extcall = li->irq.extcall;
+		break;
+	case IRQ_PEND_EXT_CLOCK_COMP:
+		irq->type = KVM_S390_INT_CLOCK_COMP;
+		break;
+	case IRQ_PEND_EXT_CPU_TIMER:
+		irq->type = KVM_S390_INT_CPU_TIMER;
+		break;
+	case IRQ_PEND_SIGP_STOP:
+		irq->type = KVM_S390_SIGP_STOP;
+		irq->u.stop = li->irq.stop;
+		break;
+	case IRQ_PEND_RESTART:
+		irq->type = KVM_S390_RESTART;
+		break;
+	case IRQ_PEND_SET_PREFIX:
+		irq->type = KVM_S390_SIGP_SET_PREFIX;
+		irq->u.prefix = li->irq.prefix;
+		break;
+	}
+}
+
+int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
+{
+	int scn;
+	unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
+	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+	unsigned long pending_irqs;
+	struct kvm_s390_irq irq;
+	unsigned long irq_type;
+	int cpuaddr;
+	int n = 0;
+
+	spin_lock(&li->lock);
+	pending_irqs = li->pending_irqs;
+	memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
+	       sizeof(sigp_emerg_pending));
+	spin_unlock(&li->lock);
+
+	for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
+		memset(&irq, 0, sizeof(irq));
+		if (irq_type == IRQ_PEND_EXT_EMERGENCY)
+			continue;
+		if (n + sizeof(irq) > len)
+			return -ENOBUFS;
+		store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
+		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+			return -EFAULT;
+		n += sizeof(irq);
+	}
+
+	if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
+		for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
+			memset(&irq, 0, sizeof(irq));
+			if (n + sizeof(irq) > len)
+				return -ENOBUFS;
+			irq.type = KVM_S390_INT_EMERGENCY;
+			irq.u.emerg.code = cpuaddr;
+			if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+				return -EFAULT;
+			n += sizeof(irq);
+		}
+	}
+
+	if (sca_ext_call_pending(vcpu, &scn)) {
+		if (n + sizeof(irq) > len)
+			return -ENOBUFS;
+		memset(&irq, 0, sizeof(irq));
+		irq.type = KVM_S390_INT_EXTERNAL_CALL;
+		irq.u.extcall.code = scn;
+		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
+			return -EFAULT;
+		n += sizeof(irq);
+	}
+
+	return n;
+}
+
+void kvm_s390_gisa_clear(struct kvm *kvm)
+{
+	if (kvm->arch.gisa) {
+		memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
+		kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
+		VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
+	}
+}
+
+void kvm_s390_gisa_init(struct kvm *kvm)
+{
+	if (css_general_characteristics.aiv) {
+		kvm->arch.gisa = &kvm->arch.sie_page2->gisa;
+		VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
+		kvm_s390_gisa_clear(kvm);
+	}
+}
+
+void kvm_s390_gisa_destroy(struct kvm *kvm)
+{
+	if (!kvm->arch.gisa)
+		return;
+	kvm->arch.gisa = NULL;
+}