Skip to content
Snippets Groups Projects
Select Git revision
  • 3d11df7abbff013b811d5615320580cd5d9d7d31
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

interrupt.c

Blame
  • interrupt.c 17.60 KiB
    /*
     * handling kvm guest interrupts
     *
     * Copyright IBM Corp. 2008
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License (version 2 only)
     * as published by the Free Software Foundation.
     *
     *    Author(s): Carsten Otte <cotte@de.ibm.com>
     */
    
    #include <linux/interrupt.h>
    #include <linux/kvm_host.h>
    #include <linux/hrtimer.h>
    #include <linux/signal.h>
    #include <linux/slab.h>
    #include <asm/asm-offsets.h>
    #include <asm/uaccess.h>
    #include "kvm-s390.h"
    #include "gaccess.h"
    #include "trace-s390.h"
    
    static int psw_extint_disabled(struct kvm_vcpu *vcpu)
    {
    	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
    }
    
    static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
    {
    	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
    	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
    	    (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
    		return 0;
    	return 1;
    }
    
    static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
    				      struct kvm_s390_interrupt_info *inti)
    {
    	switch (inti->type) {
    	case KVM_S390_INT_EXTERNAL_CALL:
    		if (psw_extint_disabled(vcpu))
    			return 0;
    		if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
    			return 1;
    	case KVM_S390_INT_EMERGENCY:
    		if (psw_extint_disabled(vcpu))
    			return 0;
    		if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
    			return 1;
    		return 0;
    	case KVM_S390_INT_SERVICE:
    		if (psw_extint_disabled(vcpu))
    			return 0;
    		if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
    			return 1;
    		return 0;
    	case KVM_S390_INT_VIRTIO:
    		if (psw_extint_disabled(vcpu))
    			return 0;
    		if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
    			return 1;
    		return 0;
    	case KVM_S390_PROGRAM_INT:
    	case KVM_S390_SIGP_STOP:
    	case KVM_S390_SIGP_SET_PREFIX:
    	case KVM_S390_RESTART:
    		return 1;
    	default:
    		BUG();
    	}
    	return 0;
    }
    
    static void __set_cpu_idle(struct kvm_vcpu *vcpu)
    {
    	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
    	atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
    	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
    }
    
    static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
    {
    	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
    	atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
    	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
    }
    
    static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
    {
    	atomic_clear_mask(CPUSTAT_ECALL_PEND |
    		CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
    		&vcpu->arch.sie_block->cpuflags);
    	vcpu->arch.sie_block->lctl = 0x0000;
    }
    
    static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
    {
    	atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
    }
    
    static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
    				      struct kvm_s390_interrupt_info *inti)
    {
    	switch (inti->type) {
    	case KVM_S390_INT_EXTERNAL_CALL:
    	case KVM_S390_INT_EMERGENCY:
    	case KVM_S390_INT_SERVICE:
    	case KVM_S390_INT_VIRTIO:
    		if (psw_extint_disabled(vcpu))
    			__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
    		else
    			vcpu->arch.sie_block->lctl |= LCTL_CR0;
    		break;
    	case KVM_S390_SIGP_STOP:
    		__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
    		break;
    	default:
    		BUG();
    	}
    }
    
    static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
    				   struct kvm_s390_interrupt_info *inti)
    {
    	const unsigned short table[] = { 2, 4, 4, 6 };
    	int rc, exception = 0;
    
    	switch (inti->type) {
    	case KVM_S390_INT_EMERGENCY:
    		VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
    		vcpu->stat.deliver_emergency_signal++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->emerg.code, 0);
    		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
    			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			__LC_EXT_NEW_PSW, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    		break;
    
    	case KVM_S390_INT_EXTERNAL_CALL:
    		VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
    		vcpu->stat.deliver_external_call++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->extcall.code, 0);
    		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
    			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			__LC_EXT_NEW_PSW, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    		break;
    
    	case KVM_S390_INT_SERVICE:
    		VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
    			   inti->ext.ext_params);
    		vcpu->stat.deliver_service_signal++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->ext.ext_params, 0);
    		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
    			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			__LC_EXT_NEW_PSW, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
    		if (rc == -EFAULT)
    			exception = 1;
    		break;
    
    	case KVM_S390_INT_VIRTIO:
    		VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
    			   inti->ext.ext_params, inti->ext.ext_params2);
    		vcpu->stat.deliver_virtio_interrupt++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->ext.ext_params,
    						 inti->ext.ext_params2);
    		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
    			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			__LC_EXT_NEW_PSW, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
    				   inti->ext.ext_params2);
    		if (rc == -EFAULT)
    			exception = 1;
    		break;
    
    	case KVM_S390_SIGP_STOP:
    		VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
    		vcpu->stat.deliver_stop_signal++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 0, 0);
    		__set_intercept_indicator(vcpu, inti);
    		break;
    
    	case KVM_S390_SIGP_SET_PREFIX:
    		VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
    			   inti->prefix.address);
    		vcpu->stat.deliver_prefix_signal++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->prefix.address, 0);
    		kvm_s390_set_prefix(vcpu, inti->prefix.address);
    		break;
    
    	case KVM_S390_RESTART:
    		VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
    		vcpu->stat.deliver_restart_signal++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 0, 0);
    		rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
    		  restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    		atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
    		break;
    
    	case KVM_S390_PROGRAM_INT:
    		VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
    			   inti->pgm.code,
    			   table[vcpu->arch.sie_block->ipa >> 14]);
    		vcpu->stat.deliver_program_int++;
    		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
    						 inti->pgm.code, 0);
    		rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = put_guest_u16(vcpu, __LC_PGM_ILC,
    			table[vcpu->arch.sie_block->ipa >> 14]);
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
    			 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    
    		rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    			__LC_PGM_NEW_PSW, sizeof(psw_t));
    		if (rc == -EFAULT)
    			exception = 1;
    		break;
    
    	default:
    		BUG();
    	}
    	if (exception) {
    		printk("kvm: The guest lowcore is not mapped during interrupt "
    			"delivery, killing userspace\n");
    		do_exit(SIGKILL);
    	}
    }
    
    static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
    {
    	int rc, exception = 0;
    
    	if (psw_extint_disabled(vcpu))
    		return 0;
    	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
    		return 0;
    	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
    	if (rc == -EFAULT)
    		exception = 1;
    	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
    		 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
    	if (rc == -EFAULT)
    		exception = 1;
    	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
    		__LC_EXT_NEW_PSW, sizeof(psw_t));
    	if (rc == -EFAULT)
    		exception = 1;
    	if (exception) {
    		printk("kvm: The guest lowcore is not mapped during interrupt "
    			"delivery, killing userspace\n");
    		do_exit(SIGKILL);
    	}
    	return 1;
    }
    
    static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
    {
    	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
    	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
    	struct kvm_s390_interrupt_info  *inti;
    	int rc = 0;
    
    	if (atomic_read(&li->active)) {
    		spin_lock_bh(&li->lock);
    		list_for_each_entry(inti, &li->list, list)
    			if (__interrupt_is_deliverable(vcpu, inti)) {
    				rc = 1;
    				break;
    			}
    		spin_unlock_bh(&li->lock);
    	}
    
    	if ((!rc) && atomic_read(&fi->active)) {
    		spin_lock(&fi->lock);
    		list_for_each_entry(inti, &fi->list, list)
    			if (__interrupt_is_deliverable(vcpu, inti)) {
    				rc = 1;
    				break;
    			}
    		spin_unlock(&fi->lock);
    	}
    
    	if ((!rc) && (vcpu->arch.sie_block->ckc <
    		get_clock() + vcpu->arch.sie_block->epoch)) {
    		if ((!psw_extint_disabled(vcpu)) &&
    			(vcpu->arch.sie_block->gcr[0] & 0x800ul))
    			rc = 1;
    	}
    
    	return rc;
    }
    
    int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
    {
    	return 0;
    }
    
    int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
    {
    	u64 now, sltime;
    	DECLARE_WAITQUEUE(wait, current);
    
    	vcpu->stat.exit_wait_state++;
    	if (kvm_cpu_has_interrupt(vcpu))
    		return 0;
    
    	__set_cpu_idle(vcpu);
    	spin_lock_bh(&vcpu->arch.local_int.lock);
    	vcpu->arch.local_int.timer_due = 0;
    	spin_unlock_bh(&vcpu->arch.local_int.lock);
    
    	if (psw_interrupts_disabled(vcpu)) {
    		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
    		__unset_cpu_idle(vcpu);
    		return -EOPNOTSUPP; /* disabled wait */
    	}
    
    	if (psw_extint_disabled(vcpu) ||
    	    (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
    		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
    		goto no_timer;
    	}
    
    	now = get_clock() + vcpu->arch.sie_block->epoch;
    	if (vcpu->arch.sie_block->ckc < now) {
    		__unset_cpu_idle(vcpu);
    		return 0;
    	}
    
    	sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
    
    	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
    	VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
    no_timer:
    	spin_lock(&vcpu->arch.local_int.float_int->lock);
    	spin_lock_bh(&vcpu->arch.local_int.lock);
    	add_wait_queue(&vcpu->arch.local_int.wq, &wait);
    	while (list_empty(&vcpu->arch.local_int.list) &&
    		list_empty(&vcpu->arch.local_int.float_int->list) &&
    		(!vcpu->arch.local_int.timer_due) &&
    		!signal_pending(current)) {
    		set_current_state(TASK_INTERRUPTIBLE);
    		spin_unlock_bh(&vcpu->arch.local_int.lock);
    		spin_unlock(&vcpu->arch.local_int.float_int->lock);
    		schedule();
    		spin_lock(&vcpu->arch.local_int.float_int->lock);
    		spin_lock_bh(&vcpu->arch.local_int.lock);
    	}
    	__unset_cpu_idle(vcpu);
    	__set_current_state(TASK_RUNNING);
    	remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
    	spin_unlock_bh(&vcpu->arch.local_int.lock);
    	spin_unlock(&vcpu->arch.local_int.float_int->lock);
    	hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
    	return 0;
    }
    
    void kvm_s390_tasklet(unsigned long parm)
    {
    	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
    
    	spin_lock(&vcpu->arch.local_int.lock);
    	vcpu->arch.local_int.timer_due = 1;
    	if (waitqueue_active(&vcpu->arch.local_int.wq))
    		wake_up_interruptible(&vcpu->arch.local_int.wq);
    	spin_unlock(&vcpu->arch.local_int.lock);
    }
    
    /*
     * low level hrtimer wake routine. Because this runs in hardirq context
     * we schedule a tasklet to do the real work.
     */
    enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
    {
    	struct kvm_vcpu *vcpu;
    
    	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
    	tasklet_schedule(&vcpu->arch.tasklet);
    
    	return HRTIMER_NORESTART;
    }
    
    void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
    {
    	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
    	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
    	struct kvm_s390_interrupt_info  *n, *inti = NULL;
    	int deliver;
    
    	__reset_intercept_indicators(vcpu);
    	if (atomic_read(&li->active)) {
    		do {
    			deliver = 0;
    			spin_lock_bh(&li->lock);
    			list_for_each_entry_safe(inti, n, &li->list, list) {
    				if (__interrupt_is_deliverable(vcpu, inti)) {
    					list_del(&inti->list);
    					deliver = 1;
    					break;
    				}
    				__set_intercept_indicator(vcpu, inti);
    			}
    			if (list_empty(&li->list))
    				atomic_set(&li->active, 0);
    			spin_unlock_bh(&li->lock);
    			if (deliver) {
    				__do_deliver_interrupt(vcpu, inti);
    				kfree(inti);
    			}
    		} while (deliver);
    	}
    
    	if ((vcpu->arch.sie_block->ckc <
    		get_clock() + vcpu->arch.sie_block->epoch))
    		__try_deliver_ckc_interrupt(vcpu);
    
    	if (atomic_read(&fi->active)) {
    		do {
    			deliver = 0;
    			spin_lock(&fi->lock);
    			list_for_each_entry_safe(inti, n, &fi->list, list) {
    				if (__interrupt_is_deliverable(vcpu, inti)) {
    					list_del(&inti->list);
    					deliver = 1;
    					break;
    				}
    				__set_intercept_indicator(vcpu, inti);
    			}
    			if (list_empty(&fi->list))
    				atomic_set(&fi->active, 0);
    			spin_unlock(&fi->lock);
    			if (deliver) {
    				__do_deliver_interrupt(vcpu, inti);
    				kfree(inti);
    			}
    		} while (deliver);
    	}
    }
    
    int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
    {
    	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
    	struct kvm_s390_interrupt_info *inti;
    
    	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
    	if (!inti)
    		return -ENOMEM;
    
    	inti->type = KVM_S390_PROGRAM_INT;
    	inti->pgm.code = code;
    
    	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
    	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
    	spin_lock_bh(&li->lock);
    	list_add(&inti->list, &li->list);
    	atomic_set(&li->active, 1);
    	BUG_ON(waitqueue_active(&li->wq));
    	spin_unlock_bh(&li->lock);
    	return 0;
    }
    
    int kvm_s390_inject_vm(struct kvm *kvm,
    		       struct kvm_s390_interrupt *s390int)
    {
    	struct kvm_s390_local_interrupt *li;
    	struct kvm_s390_float_interrupt *fi;
    	struct kvm_s390_interrupt_info *inti;
    	int sigcpu;
    
    	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
    	if (!inti)
    		return -ENOMEM;
    
    	switch (s390int->type) {
    	case KVM_S390_INT_VIRTIO:
    		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
    			 s390int->parm, s390int->parm64);
    		inti->type = s390int->type;
    		inti->ext.ext_params = s390int->parm;
    		inti->ext.ext_params2 = s390int->parm64;
    		break;
    	case KVM_S390_INT_SERVICE:
    		VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
    		inti->type = s390int->type;
    		inti->ext.ext_params = s390int->parm;
    		break;
    	case KVM_S390_PROGRAM_INT:
    	case KVM_S390_SIGP_STOP:
    	case KVM_S390_INT_EXTERNAL_CALL:
    	case KVM_S390_INT_EMERGENCY:
    	default:
    		kfree(inti);
    		return -EINVAL;
    	}
    	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
    				 2);
    
    	mutex_lock(&kvm->lock);
    	fi = &kvm->arch.float_int;
    	spin_lock(&fi->lock);
    	list_add_tail(&inti->list, &fi->list);
    	atomic_set(&fi->active, 1);
    	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
    	if (sigcpu == KVM_MAX_VCPUS) {
    		do {
    			sigcpu = fi->next_rr_cpu++;
    			if (sigcpu == KVM_MAX_VCPUS)
    				sigcpu = fi->next_rr_cpu = 0;
    		} while (fi->local_int[sigcpu] == NULL);
    	}
    	li = fi->local_int[sigcpu];
    	spin_lock_bh(&li->lock);
    	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
    	if (waitqueue_active(&li->wq))
    		wake_up_interruptible(&li->wq);
    	spin_unlock_bh(&li->lock);
    	spin_unlock(&fi->lock);
    	mutex_unlock(&kvm->lock);
    	return 0;
    }
    
    int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
    			 struct kvm_s390_interrupt *s390int)
    {
    	struct kvm_s390_local_interrupt *li;
    	struct kvm_s390_interrupt_info *inti;
    
    	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
    	if (!inti)
    		return -ENOMEM;
    
    	switch (s390int->type) {
    	case KVM_S390_PROGRAM_INT:
    		if (s390int->parm & 0xffff0000) {
    			kfree(inti);
    			return -EINVAL;
    		}
    		inti->type = s390int->type;
    		inti->pgm.code = s390int->parm;
    		VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
    			   s390int->parm);
    		break;
    	case KVM_S390_SIGP_SET_PREFIX:
    		inti->prefix.address = s390int->parm;
    		inti->type = s390int->type;
    		VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
    			   s390int->parm);
    		break;
    	case KVM_S390_SIGP_STOP:
    	case KVM_S390_RESTART:
    	case KVM_S390_INT_EXTERNAL_CALL:
    	case KVM_S390_INT_EMERGENCY:
    		VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
    		inti->type = s390int->type;
    		break;
    	case KVM_S390_INT_VIRTIO:
    	case KVM_S390_INT_SERVICE:
    	default:
    		kfree(inti);
    		return -EINVAL;
    	}
    	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
    				   s390int->parm64, 2);
    
    	mutex_lock(&vcpu->kvm->lock);
    	li = &vcpu->arch.local_int;
    	spin_lock_bh(&li->lock);
    	if (inti->type == KVM_S390_PROGRAM_INT)
    		list_add(&inti->list, &li->list);
    	else
    		list_add_tail(&inti->list, &li->list);
    	atomic_set(&li->active, 1);
    	if (inti->type == KVM_S390_SIGP_STOP)
    		li->action_bits |= ACTION_STOP_ON_STOP;
    	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
    	if (waitqueue_active(&li->wq))
    		wake_up_interruptible(&vcpu->arch.local_int.wq);
    	spin_unlock_bh(&li->lock);
    	mutex_unlock(&vcpu->kvm->lock);
    	return 0;
    }