[mirror_ubuntu-kernels.git] / arch / s390 / kvm / interrupt.c

/*
 * interrupt.c - 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 <asm/lowcore.h>
#include <asm/uaccess.h>
#include <linux/kvm_host.h>
#include <linux/signal.h>
#include "kvm-s390.h"
#include "gaccess.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_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_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++;
		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
		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++;
		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++;
		rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
		if (rc == -EFAULT)
			exception = 1;

		rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 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_PFAULT_INTPARM,
			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++;
		__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++;
		vcpu->arch.sie_block->prefix = inti->prefix.address;
		vcpu->arch.sie_block->ihcpu = 0xffff;
		break;

	case KVM_S390_RESTART:
		VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
		vcpu->stat.deliver_restart_signal++;
		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;
		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++;
		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;
}

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_bh(&fi->lock);
		list_for_each_entry(inti, &fi->list, list)
			if (__interrupt_is_deliverable(vcpu, inti)) {
				rc = 1;
				break;
			}
		spin_unlock_bh(&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_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
{
	/* do real check here */
	return 1;
}

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 -ENOTSUPP; /* 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) / (0xf4240000ul / HZ) + 1;

	vcpu->arch.ckc_timer.expires = jiffies + sltime;

	add_timer(&vcpu->arch.ckc_timer);
	VCPU_EVENT(vcpu, 5, "enabled wait timer:%llx jiffies", sltime);
no_timer:
	spin_lock_bh(&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_bh(&vcpu->arch.local_int.float_int->lock);
		vcpu_put(vcpu);
		schedule();
		vcpu_load(vcpu);
		spin_lock_bh(&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->wq, &wait);
	spin_unlock_bh(&vcpu->arch.local_int.lock);
	spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
	del_timer(&vcpu->arch.ckc_timer);
	return 0;
}

void kvm_s390_idle_wakeup(unsigned long data)
{
	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;

	spin_lock_bh(&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_bh(&vcpu->arch.local_int.lock);
}


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_bh(&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_bh(&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);
	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_EMERGENCY:
	default:
		kfree(inti);
		return -EINVAL;
	}

	mutex_lock(&kvm->lock);
	fi = &kvm->arch.float_int;
	spin_lock_bh(&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_bh(&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_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;
	}

	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;
}
Commit	Line	Data
ba5c1e9b CO	1	/*
	2	* interrupt.c - handling kvm guest interrupts
	3	*
	4	* Copyright IBM Corp. 2008
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License (version 2 only)
	8	* as published by the Free Software Foundation.
	9	*
	10	* Author(s): Carsten Otte <cotte@de.ibm.com>
	11	*/
	12
	13	#include <asm/lowcore.h>
	14	#include <asm/uaccess.h>
	15	#include <linux/kvm_host.h>
3cd61299	16	#include <linux/signal.h>
ba5c1e9b CO	17	#include "kvm-s390.h"
	18	#include "gaccess.h"
	19
	20	static int psw_extint_disabled(struct kvm_vcpu *vcpu)
	21	{
	22	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
	23	}
	24
	25	static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
	26	{
	27	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) \|\|
	28	(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) \|\|
	29	(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
	30	return 0;
	31	return 1;
	32	}
	33
	34	static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
180c12fb	35	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	36	{
	37	switch (inti->type) {
	38	case KVM_S390_INT_EMERGENCY:
	39	if (psw_extint_disabled(vcpu))
	40	return 0;
	41	if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
	42	return 1;
	43	return 0;
	44	case KVM_S390_INT_SERVICE:
	45	if (psw_extint_disabled(vcpu))
	46	return 0;
	47	if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
	48	return 1;
	49	return 0;
	50	case KVM_S390_INT_VIRTIO:
	51	if (psw_extint_disabled(vcpu))
	52	return 0;
	53	if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
	54	return 1;
	55	return 0;
	56	case KVM_S390_PROGRAM_INT:
	57	case KVM_S390_SIGP_STOP:
	58	case KVM_S390_SIGP_SET_PREFIX:
	59	case KVM_S390_RESTART:
	60	return 1;
	61	default:
	62	BUG();
	63	}
	64	return 0;
	65	}
	66
	67	static void __set_cpu_idle(struct kvm_vcpu *vcpu)
	68	{
	69	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
	70	atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
	71	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
	72	}
	73
	74	static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
	75	{
	76	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
	77	atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
	78	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
	79	}
	80
	81	static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
	82	{
	83	atomic_clear_mask(CPUSTAT_ECALL_PEND \|
	84	CPUSTAT_IO_INT \| CPUSTAT_EXT_INT \| CPUSTAT_STOP_INT,
	85	&vcpu->arch.sie_block->cpuflags);
	86	vcpu->arch.sie_block->lctl = 0x0000;
	87	}
	88
	89	static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
	90	{
	91	atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
	92	}
	93
	94	static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
180c12fb	95	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	96	{
	97	switch (inti->type) {
	98	case KVM_S390_INT_EMERGENCY:
	99	case KVM_S390_INT_SERVICE:
	100	case KVM_S390_INT_VIRTIO:
	101	if (psw_extint_disabled(vcpu))
	102	__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
	103	else
	104	vcpu->arch.sie_block->lctl \|= LCTL_CR0;
	105	break;
	106	case KVM_S390_SIGP_STOP:
	107	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
	108	break;
	109	default:
	110	BUG();
	111	}
	112	}
	113
	114	static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
180c12fb	115	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	116	{
	117	const unsigned short table[] = { 2, 4, 4, 6 };
	118	int rc, exception = 0;
	119
	120	switch (inti->type) {
	121	case KVM_S390_INT_EMERGENCY:
	122	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
	123	vcpu->stat.deliver_emergency_signal++;
	124	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
	125	if (rc == -EFAULT)
	126	exception = 1;
	127
	128	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	129	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	130	if (rc == -EFAULT)
	131	exception = 1;
	132
	133	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	134	__LC_EXT_NEW_PSW, sizeof(psw_t));
	135	if (rc == -EFAULT)
	136	exception = 1;
	137	break;
	138
	139	case KVM_S390_INT_SERVICE:
	140	VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
	141	inti->ext.ext_params);
	142	vcpu->stat.deliver_service_signal++;
	143	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
	144	if (rc == -EFAULT)
	145	exception = 1;
	146
	147	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	148	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	149	if (rc == -EFAULT)
	150	exception = 1;
	151
	152	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	153	__LC_EXT_NEW_PSW, sizeof(psw_t));
	154	if (rc == -EFAULT)
	155	exception = 1;
	156
	157	rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
	158	if (rc == -EFAULT)
	159	exception = 1;
	160	break;
	161
	162	case KVM_S390_INT_VIRTIO:
33e19115	163	VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
ba5c1e9b CO	164	inti->ext.ext_params, inti->ext.ext_params2);
	165	vcpu->stat.deliver_virtio_interrupt++;
	166	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
	167	if (rc == -EFAULT)
	168	exception = 1;
	169
	170	rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
	171	if (rc == -EFAULT)
	172	exception = 1;
	173
	174	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	175	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	176	if (rc == -EFAULT)
	177	exception = 1;
	178
	179	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	180	__LC_EXT_NEW_PSW, sizeof(psw_t));
	181	if (rc == -EFAULT)
	182	exception = 1;
	183
	184	rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
	185	if (rc == -EFAULT)
	186	exception = 1;
	187
	188	rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM,
	189	inti->ext.ext_params2);
	190	if (rc == -EFAULT)
	191	exception = 1;
	192	break;
	193
	194	case KVM_S390_SIGP_STOP:
	195	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
	196	vcpu->stat.deliver_stop_signal++;
	197	__set_intercept_indicator(vcpu, inti);
	198	break;
	199
	200	case KVM_S390_SIGP_SET_PREFIX:
	201	VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
	202	inti->prefix.address);
	203	vcpu->stat.deliver_prefix_signal++;
	204	vcpu->arch.sie_block->prefix = inti->prefix.address;
	205	vcpu->arch.sie_block->ihcpu = 0xffff;
	206	break;
	207
	208	case KVM_S390_RESTART:
	209	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
	210	vcpu->stat.deliver_restart_signal++;
	211	rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
	212	restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	213	if (rc == -EFAULT)
	214	exception = 1;
	215
	216	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	217	offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
	218	if (rc == -EFAULT)
	219	exception = 1;
	220	break;
	221
	222	case KVM_S390_PROGRAM_INT:
	223	VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
	224	inti->pgm.code,
	225	table[vcpu->arch.sie_block->ipa >> 14]);
	226	vcpu->stat.deliver_program_int++;
	227	rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
228	if (rc == -EFAULT)
229	exception = 1;
230
231	rc = put_guest_u16(vcpu, __LC_PGM_ILC,
232	table[vcpu->arch.sie_block->ipa >> 14]);
233	if (rc == -EFAULT)
234	exception = 1;
235
236	rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
237	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
238	if (rc == -EFAULT)
239	exception = 1;
240
241	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
242	__LC_PGM_NEW_PSW, sizeof(psw_t));
243	if (rc == -EFAULT)
244	exception = 1;
245	break;
246
247	default:
248	BUG();
249	}
ba5c1e9b	250	if (exception) {
3cd61299 CB	251	printk("kvm: The guest lowcore is not mapped during interrupt "
	252	"delivery, killing userspace\n");
	253	do_exit(SIGKILL);
ba5c1e9b CO	254	}
	255	}
	256
	257	static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
	258	{
	259	int rc, exception = 0;
	260
	261	if (psw_extint_disabled(vcpu))
	262	return 0;
	263	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
	264	return 0;
	265	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
	266	if (rc == -EFAULT)
	267	exception = 1;
	268	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	269	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	270	if (rc == -EFAULT)
	271	exception = 1;
	272	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	273	__LC_EXT_NEW_PSW, sizeof(psw_t));
	274	if (rc == -EFAULT)
	275	exception = 1;
ba5c1e9b	276	if (exception) {
3cd61299 CB	277	printk("kvm: The guest lowcore is not mapped during interrupt "
	278	"delivery, killing userspace\n");
	279	do_exit(SIGKILL);
ba5c1e9b	280	}
ba5c1e9b CO	281	return 1;
	282	}
	283
	284	int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
	285	{
180c12fb CB	286	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	287	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	288	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	289	int rc = 0;
	290
	291	if (atomic_read(&li->active)) {
	292	spin_lock_bh(&li->lock);
	293	list_for_each_entry(inti, &li->list, list)
	294	if (__interrupt_is_deliverable(vcpu, inti)) {
	295	rc = 1;
	296	break;
	297	}
	298	spin_unlock_bh(&li->lock);
	299	}
	300
	301	if ((!rc) && atomic_read(&fi->active)) {
	302	spin_lock_bh(&fi->lock);
	303	list_for_each_entry(inti, &fi->list, list)
	304	if (__interrupt_is_deliverable(vcpu, inti)) {
	305	rc = 1;
	306	break;
	307	}
	308	spin_unlock_bh(&fi->lock);
	309	}
	310
	311	if ((!rc) && (vcpu->arch.sie_block->ckc <
	312	get_clock() + vcpu->arch.sie_block->epoch)) {
	313	if ((!psw_extint_disabled(vcpu)) &&
	314	(vcpu->arch.sie_block->gcr[0] & 0x800ul))
	315	rc = 1;
	316	}
	317
	318	return rc;
	319	}
	320
78646121 GN	321	int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
	322	{
	323	/* do real check here */
	324	return 1;
	325	}
	326
3d80840d MT	327	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	328	{
	329	return 0;
	330	}
	331
ba5c1e9b CO	332	int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
	333	{
	334	u64 now, sltime;
	335	DECLARE_WAITQUEUE(wait, current);
	336
	337	vcpu->stat.exit_wait_state++;
	338	if (kvm_cpu_has_interrupt(vcpu))
	339	return 0;
	340
e52b2af5 CO	341	__set_cpu_idle(vcpu);
	342	spin_lock_bh(&vcpu->arch.local_int.lock);
	343	vcpu->arch.local_int.timer_due = 0;
	344	spin_unlock_bh(&vcpu->arch.local_int.lock);
	345
ba5c1e9b CO	346	if (psw_interrupts_disabled(vcpu)) {
	347	VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
	348	__unset_cpu_idle(vcpu);
	349	return -ENOTSUPP; /* disabled wait */
	350	}
	351
	352	if (psw_extint_disabled(vcpu) \|\|
	353	(!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
	354	VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
	355	goto no_timer;
	356	}
	357
	358	now = get_clock() + vcpu->arch.sie_block->epoch;
	359	if (vcpu->arch.sie_block->ckc < now) {
	360	__unset_cpu_idle(vcpu);
	361	return 0;
	362	}
	363
	364	sltime = (vcpu->arch.sie_block->ckc - now) / (0xf4240000ul / HZ) + 1;
	365
	366	vcpu->arch.ckc_timer.expires = jiffies + sltime;
	367
	368	add_timer(&vcpu->arch.ckc_timer);
33e19115	369	VCPU_EVENT(vcpu, 5, "enabled wait timer:%llx jiffies", sltime);
ba5c1e9b CO	370	no_timer:
	371	spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
	372	spin_lock_bh(&vcpu->arch.local_int.lock);
ba5c1e9b CO	373	add_wait_queue(&vcpu->arch.local_int.wq, &wait);
	374	while (list_empty(&vcpu->arch.local_int.list) &&
	375	list_empty(&vcpu->arch.local_int.float_int->list) &&
	376	(!vcpu->arch.local_int.timer_due) &&
	377	!signal_pending(current)) {
	378	set_current_state(TASK_INTERRUPTIBLE);
	379	spin_unlock_bh(&vcpu->arch.local_int.lock);
	380	spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
	381	vcpu_put(vcpu);
	382	schedule();
	383	vcpu_load(vcpu);
	384	spin_lock_bh(&vcpu->arch.local_int.float_int->lock);
	385	spin_lock_bh(&vcpu->arch.local_int.lock);
	386	}
	387	__unset_cpu_idle(vcpu);
	388	__set_current_state(TASK_RUNNING);
	389	remove_wait_queue(&vcpu->wq, &wait);
	390	spin_unlock_bh(&vcpu->arch.local_int.lock);
	391	spin_unlock_bh(&vcpu->arch.local_int.float_int->lock);
	392	del_timer(&vcpu->arch.ckc_timer);
	393	return 0;
	394	}
	395
	396	void kvm_s390_idle_wakeup(unsigned long data)
	397	{
	398	struct kvm_vcpu vcpu = (struct kvm_vcpu )data;
	399
	400	spin_lock_bh(&vcpu->arch.local_int.lock);
	401	vcpu->arch.local_int.timer_due = 1;
	402	if (waitqueue_active(&vcpu->arch.local_int.wq))
	403	wake_up_interruptible(&vcpu->arch.local_int.wq);
	404	spin_unlock_bh(&vcpu->arch.local_int.lock);
	405	}
	406
	407
	408	void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
	409	{
180c12fb CB	410	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	411	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	412	struct kvm_s390_interrupt_info n, inti = NULL;
ba5c1e9b CO	413	int deliver;
	414
	415	__reset_intercept_indicators(vcpu);
	416	if (atomic_read(&li->active)) {
	417	do {
	418	deliver = 0;
	419	spin_lock_bh(&li->lock);
	420	list_for_each_entry_safe(inti, n, &li->list, list) {
	421	if (__interrupt_is_deliverable(vcpu, inti)) {
	422	list_del(&inti->list);
	423	deliver = 1;
	424	break;
	425	}
	426	__set_intercept_indicator(vcpu, inti);
	427	}
	428	if (list_empty(&li->list))
	429	atomic_set(&li->active, 0);
	430	spin_unlock_bh(&li->lock);
	431	if (deliver) {
	432	__do_deliver_interrupt(vcpu, inti);
	433	kfree(inti);
	434	}
	435	} while (deliver);
	436	}
	437
	438	if ((vcpu->arch.sie_block->ckc <
	439	get_clock() + vcpu->arch.sie_block->epoch))
	440	__try_deliver_ckc_interrupt(vcpu);
	441
	442	if (atomic_read(&fi->active)) {
	443	do {
	444	deliver = 0;
	445	spin_lock_bh(&fi->lock);
	446	list_for_each_entry_safe(inti, n, &fi->list, list) {
	447	if (__interrupt_is_deliverable(vcpu, inti)) {
	448	list_del(&inti->list);
	449	deliver = 1;
	450	break;
	451	}
	452	__set_intercept_indicator(vcpu, inti);
	453	}
	454	if (list_empty(&fi->list))
	455	atomic_set(&fi->active, 0);
	456	spin_unlock_bh(&fi->lock);
	457	if (deliver) {
	458	__do_deliver_interrupt(vcpu, inti);
	459	kfree(inti);
	460	}
	461	} while (deliver);
	462	}
	463	}
	464
	465	int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
	466	{
180c12fb CB	467	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
180c12fb CB	468	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	469
	470	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	471	if (!inti)
	472	return -ENOMEM;
	473
	474	inti->type = KVM_S390_PROGRAM_INT;;
	475	inti->pgm.code = code;
	476
	477	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
	478	spin_lock_bh(&li->lock);
	479	list_add(&inti->list, &li->list);
	480	atomic_set(&li->active, 1);
	481	BUG_ON(waitqueue_active(&li->wq));
	482	spin_unlock_bh(&li->lock);
	483	return 0;
	484	}
	485
	486	int kvm_s390_inject_vm(struct kvm *kvm,
	487	struct kvm_s390_interrupt *s390int)
	488	{
180c12fb CB	489	struct kvm_s390_local_interrupt *li;
	490	struct kvm_s390_float_interrupt *fi;
	491	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	492	int sigcpu;
	493
	494	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	495	if (!inti)
	496	return -ENOMEM;
	497
	498	switch (s390int->type) {
	499	case KVM_S390_INT_VIRTIO:
33e19115	500	VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
ba5c1e9b CO	501	s390int->parm, s390int->parm64);
	502	inti->type = s390int->type;
	503	inti->ext.ext_params = s390int->parm;
	504	inti->ext.ext_params2 = s390int->parm64;
	505	break;
	506	case KVM_S390_INT_SERVICE:
	507	VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
	508	inti->type = s390int->type;
	509	inti->ext.ext_params = s390int->parm;
	510	break;
	511	case KVM_S390_PROGRAM_INT:
	512	case KVM_S390_SIGP_STOP:
	513	case KVM_S390_INT_EMERGENCY:
	514	default:
	515	kfree(inti);
	516	return -EINVAL;
	517	}
	518
	519	mutex_lock(&kvm->lock);
	520	fi = &kvm->arch.float_int;
	521	spin_lock_bh(&fi->lock);
	522	list_add_tail(&inti->list, &fi->list);
	523	atomic_set(&fi->active, 1);
	524	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
	525	if (sigcpu == KVM_MAX_VCPUS) {
	526	do {
	527	sigcpu = fi->next_rr_cpu++;
	528	if (sigcpu == KVM_MAX_VCPUS)
	529	sigcpu = fi->next_rr_cpu = 0;
	530	} while (fi->local_int[sigcpu] == NULL);
	531	}
	532	li = fi->local_int[sigcpu];
	533	spin_lock_bh(&li->lock);
	534	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	535	if (waitqueue_active(&li->wq))
	536	wake_up_interruptible(&li->wq);
	537	spin_unlock_bh(&li->lock);
	538	spin_unlock_bh(&fi->lock);
	539	mutex_unlock(&kvm->lock);
	540	return 0;
	541	}
	542
	543	int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
	544	struct kvm_s390_interrupt *s390int)
	545	{
180c12fb CB	546	struct kvm_s390_local_interrupt *li;
180c12fb CB	547	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	548
	549	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	550	if (!inti)
	551	return -ENOMEM;
	552
	553	switch (s390int->type) {
	554	case KVM_S390_PROGRAM_INT:
	555	if (s390int->parm & 0xffff0000) {
	556	kfree(inti);
	557	return -EINVAL;
	558	}
	559	inti->type = s390int->type;
	560	inti->pgm.code = s390int->parm;
	561	VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
	562	s390int->parm);
	563	break;
b7e6e4d3 CB	564	case KVM_S390_SIGP_SET_PREFIX:
	565	inti->prefix.address = s390int->parm;
	566	inti->type = s390int->type;
	567	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
	568	s390int->parm);
	569	break;
ba5c1e9b CO	570	case KVM_S390_SIGP_STOP:
ba5c1e9b CO	571	case KVM_S390_RESTART:
ba5c1e9b CO	572	case KVM_S390_INT_EMERGENCY:
	573	VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
	574	inti->type = s390int->type;
	575	break;
	576	case KVM_S390_INT_VIRTIO:
	577	case KVM_S390_INT_SERVICE:
	578	default:
	579	kfree(inti);
	580	return -EINVAL;
	581	}
	582
	583	mutex_lock(&vcpu->kvm->lock);
	584	li = &vcpu->arch.local_int;
	585	spin_lock_bh(&li->lock);
	586	if (inti->type == KVM_S390_PROGRAM_INT)
	587	list_add(&inti->list, &li->list);
	588	else
	589	list_add_tail(&inti->list, &li->list);
	590	atomic_set(&li->active, 1);
	591	if (inti->type == KVM_S390_SIGP_STOP)
	592	li->action_bits \|= ACTION_STOP_ON_STOP;
	593	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	594	if (waitqueue_active(&li->wq))
	595	wake_up_interruptible(&vcpu->arch.local_int.wq);
	596	spin_unlock_bh(&li->lock);
	597	mutex_unlock(&vcpu->kvm->lock);
	598	return 0;
	599	}