[mirror_ubuntu-jammy-kernel.git] / arch / s390 / kvm / 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 <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;
}
Commit	Line	Data
ba5c1e9b	1	/*
a53c8fab	2	* handling kvm guest interrupts
ba5c1e9b CO	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
ca872302	13	#include <linux/interrupt.h>
ba5c1e9b	14	#include <linux/kvm_host.h>
cbb870c8	15	#include <linux/hrtimer.h>
3cd61299	16	#include <linux/signal.h>
5a0e3ad6	17	#include <linux/slab.h>
cbb870c8 HC	18	#include <asm/asm-offsets.h>
cbb870c8 HC	19	#include <asm/uaccess.h>
ba5c1e9b CO	20	#include "kvm-s390.h"
ba5c1e9b CO	21	#include "gaccess.h"
ade38c31	22	#include "trace-s390.h"
ba5c1e9b CO	23
	24	static int psw_extint_disabled(struct kvm_vcpu *vcpu)
	25	{
	26	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
	27	}
	28
	29	static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
	30	{
	31	if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) \|\|
	32	(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) \|\|
	33	(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
	34	return 0;
	35	return 1;
	36	}
	37
	38	static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
180c12fb	39	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	40	{
ba5c1e9b CO	41	switch (inti->type) {
7697e71f CE	42	case KVM_S390_INT_EXTERNAL_CALL:
	43	if (psw_extint_disabled(vcpu))
	44	return 0;
	45	if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
	46	return 1;
ba5c1e9b CO	47	case KVM_S390_INT_EMERGENCY:
	48	if (psw_extint_disabled(vcpu))
	49	return 0;
	50	if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
	51	return 1;
	52	return 0;
	53	case KVM_S390_INT_SERVICE:
	54	if (psw_extint_disabled(vcpu))
	55	return 0;
	56	if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
	57	return 1;
	58	return 0;
	59	case KVM_S390_INT_VIRTIO:
	60	if (psw_extint_disabled(vcpu))
	61	return 0;
	62	if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
	63	return 1;
	64	return 0;
	65	case KVM_S390_PROGRAM_INT:
	66	case KVM_S390_SIGP_STOP:
	67	case KVM_S390_SIGP_SET_PREFIX:
	68	case KVM_S390_RESTART:
	69	return 1;
	70	default:
	71	BUG();
	72	}
	73	return 0;
	74	}
	75
	76	static void __set_cpu_idle(struct kvm_vcpu *vcpu)
	77	{
	78	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
	79	atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
	80	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
	81	}
	82
	83	static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
	84	{
	85	BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
	86	atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
	87	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
	88	}
	89
	90	static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
	91	{
	92	atomic_clear_mask(CPUSTAT_ECALL_PEND \|
	93	CPUSTAT_IO_INT \| CPUSTAT_EXT_INT \| CPUSTAT_STOP_INT,
	94	&vcpu->arch.sie_block->cpuflags);
	95	vcpu->arch.sie_block->lctl = 0x0000;
	96	}
	97
	98	static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
	99	{
	100	atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
	101	}
	102
	103	static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
180c12fb	104	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	105	{
ba5c1e9b CO	106	switch (inti->type) {
7697e71f	107	case KVM_S390_INT_EXTERNAL_CALL:
ba5c1e9b CO	108	case KVM_S390_INT_EMERGENCY:
	109	case KVM_S390_INT_SERVICE:
	110	case KVM_S390_INT_VIRTIO:
	111	if (psw_extint_disabled(vcpu))
	112	__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
	113	else
	114	vcpu->arch.sie_block->lctl \|= LCTL_CR0;
	115	break;
	116	case KVM_S390_SIGP_STOP:
	117	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
	118	break;
	119	default:
	120	BUG();
	121	}
	122	}
	123
	124	static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
180c12fb	125	struct kvm_s390_interrupt_info *inti)
ba5c1e9b CO	126	{
	127	const unsigned short table[] = { 2, 4, 4, 6 };
	128	int rc, exception = 0;
	129
	130	switch (inti->type) {
	131	case KVM_S390_INT_EMERGENCY:
	132	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
	133	vcpu->stat.deliver_emergency_signal++;
ade38c31 CH	134	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	135	inti->emerg.code, 0);
ba5c1e9b CO	136	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
	137	if (rc == -EFAULT)
	138	exception = 1;
	139
7e180bd8	140	rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code);
8bb3a2eb CE	141	if (rc == -EFAULT)
	142	exception = 1;
	143
ba5c1e9b CO	144	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	145	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	146	if (rc == -EFAULT)
	147	exception = 1;
	148
	149	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	150	__LC_EXT_NEW_PSW, sizeof(psw_t));
	151	if (rc == -EFAULT)
	152	exception = 1;
	153	break;
	154
7697e71f CE	155	case KVM_S390_INT_EXTERNAL_CALL:
	156	VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
	157	vcpu->stat.deliver_external_call++;
ade38c31 CH	158	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	159	inti->extcall.code, 0);
7697e71f CE	160	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
	161	if (rc == -EFAULT)
	162	exception = 1;
	163
7e180bd8	164	rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code);
7697e71f CE	165	if (rc == -EFAULT)
	166	exception = 1;
	167
	168	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	169	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	170	if (rc == -EFAULT)
	171	exception = 1;
	172
	173	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	174	__LC_EXT_NEW_PSW, sizeof(psw_t));
	175	if (rc == -EFAULT)
	176	exception = 1;
	177	break;
	178
ba5c1e9b CO	179	case KVM_S390_INT_SERVICE:
	180	VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
	181	inti->ext.ext_params);
	182	vcpu->stat.deliver_service_signal++;
ade38c31 CH	183	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	184	inti->ext.ext_params, 0);
ba5c1e9b CO	185	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
	186	if (rc == -EFAULT)
	187	exception = 1;
	188
	189	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	190	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	191	if (rc == -EFAULT)
	192	exception = 1;
	193
	194	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	195	__LC_EXT_NEW_PSW, sizeof(psw_t));
	196	if (rc == -EFAULT)
	197	exception = 1;
	198
	199	rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
	200	if (rc == -EFAULT)
	201	exception = 1;
	202	break;
	203
	204	case KVM_S390_INT_VIRTIO:
33e19115	205	VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
ba5c1e9b CO	206	inti->ext.ext_params, inti->ext.ext_params2);
ba5c1e9b CO	207	vcpu->stat.deliver_virtio_interrupt++;
ade38c31 CH	208	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
	209	inti->ext.ext_params,
	210	inti->ext.ext_params2);
ba5c1e9b CO	211	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
	212	if (rc == -EFAULT)
	213	exception = 1;
	214
7e180bd8	215	rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00);
ba5c1e9b CO	216	if (rc == -EFAULT)
	217	exception = 1;
	218
	219	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	220	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	221	if (rc == -EFAULT)
	222	exception = 1;
	223
	224	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	225	__LC_EXT_NEW_PSW, sizeof(psw_t));
	226	if (rc == -EFAULT)
	227	exception = 1;
	228
	229	rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params);
	230	if (rc == -EFAULT)
	231	exception = 1;
	232
cbb870c8 HC	233	rc = put_guest_u64(vcpu, __LC_EXT_PARAMS2,
cbb870c8 HC	234	inti->ext.ext_params2);
ba5c1e9b CO	235	if (rc == -EFAULT)
	236	exception = 1;
	237	break;
	238
	239	case KVM_S390_SIGP_STOP:
	240	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
	241	vcpu->stat.deliver_stop_signal++;
ade38c31 CH	242	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	243	0, 0);
ba5c1e9b CO	244	__set_intercept_indicator(vcpu, inti);
	245	break;
	246
	247	case KVM_S390_SIGP_SET_PREFIX:
	248	VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
	249	inti->prefix.address);
	250	vcpu->stat.deliver_prefix_signal++;
ade38c31 CH	251	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	252	inti->prefix.address, 0);
8d26cf7b	253	kvm_s390_set_prefix(vcpu, inti->prefix.address);
ba5c1e9b CO	254	break;
	255
	256	case KVM_S390_RESTART:
	257	VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
	258	vcpu->stat.deliver_restart_signal++;
ade38c31 CH	259	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	260	0, 0);
ba5c1e9b CO	261	rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
	262	restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	263	if (rc == -EFAULT)
	264	exception = 1;
	265
	266	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	267	offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
	268	if (rc == -EFAULT)
	269	exception = 1;
9e6dabef	270	atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
ba5c1e9b CO	271	break;
	272
	273	case KVM_S390_PROGRAM_INT:
	274	VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
	275	inti->pgm.code,
	276	table[vcpu->arch.sie_block->ipa >> 14]);
	277	vcpu->stat.deliver_program_int++;
ade38c31 CH	278	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
ade38c31 CH	279	inti->pgm.code, 0);
ba5c1e9b CO	280	rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
	281	if (rc == -EFAULT)
	282	exception = 1;
	283
	284	rc = put_guest_u16(vcpu, __LC_PGM_ILC,
	285	table[vcpu->arch.sie_block->ipa >> 14]);
	286	if (rc == -EFAULT)
	287	exception = 1;
	288
	289	rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
	290	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	291	if (rc == -EFAULT)
	292	exception = 1;
	293
	294	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	295	__LC_PGM_NEW_PSW, sizeof(psw_t));
	296	if (rc == -EFAULT)
	297	exception = 1;
	298	break;
	299
	300	default:
	301	BUG();
	302	}
ba5c1e9b	303	if (exception) {
3cd61299 CB	304	printk("kvm: The guest lowcore is not mapped during interrupt "
	305	"delivery, killing userspace\n");
	306	do_exit(SIGKILL);
ba5c1e9b CO	307	}
	308	}
	309
	310	static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
	311	{
	312	int rc, exception = 0;
	313
	314	if (psw_extint_disabled(vcpu))
	315	return 0;
	316	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
	317	return 0;
	318	rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004);
	319	if (rc == -EFAULT)
	320	exception = 1;
	321	rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
	322	&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
	323	if (rc == -EFAULT)
	324	exception = 1;
	325	rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
	326	__LC_EXT_NEW_PSW, sizeof(psw_t));
	327	if (rc == -EFAULT)
	328	exception = 1;
ba5c1e9b	329	if (exception) {
3cd61299 CB	330	printk("kvm: The guest lowcore is not mapped during interrupt "
	331	"delivery, killing userspace\n");
	332	do_exit(SIGKILL);
ba5c1e9b	333	}
ba5c1e9b CO	334	return 1;
	335	}
	336
a1b37100	337	static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
ba5c1e9b	338	{
180c12fb CB	339	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	340	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	341	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	342	int rc = 0;
	343
	344	if (atomic_read(&li->active)) {
	345	spin_lock_bh(&li->lock);
	346	list_for_each_entry(inti, &li->list, list)
	347	if (__interrupt_is_deliverable(vcpu, inti)) {
	348	rc = 1;
	349	break;
	350	}
	351	spin_unlock_bh(&li->lock);
	352	}
	353
	354	if ((!rc) && atomic_read(&fi->active)) {
b037a4f3	355	spin_lock(&fi->lock);
ba5c1e9b CO	356	list_for_each_entry(inti, &fi->list, list)
	357	if (__interrupt_is_deliverable(vcpu, inti)) {
	358	rc = 1;
	359	break;
	360	}
b037a4f3	361	spin_unlock(&fi->lock);
ba5c1e9b CO	362	}
	363
	364	if ((!rc) && (vcpu->arch.sie_block->ckc <
	365	get_clock() + vcpu->arch.sie_block->epoch)) {
	366	if ((!psw_extint_disabled(vcpu)) &&
	367	(vcpu->arch.sie_block->gcr[0] & 0x800ul))
	368	rc = 1;
	369	}
	370
	371	return rc;
	372	}
	373
3d80840d MT	374	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	375	{
	376	return 0;
	377	}
	378
ba5c1e9b CO	379	int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
	380	{
	381	u64 now, sltime;
	382	DECLARE_WAITQUEUE(wait, current);
	383
	384	vcpu->stat.exit_wait_state++;
	385	if (kvm_cpu_has_interrupt(vcpu))
	386	return 0;
	387
e52b2af5 CO	388	__set_cpu_idle(vcpu);
	389	spin_lock_bh(&vcpu->arch.local_int.lock);
	390	vcpu->arch.local_int.timer_due = 0;
	391	spin_unlock_bh(&vcpu->arch.local_int.lock);
	392
ba5c1e9b CO	393	if (psw_interrupts_disabled(vcpu)) {
	394	VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
	395	__unset_cpu_idle(vcpu);
b8e660b8	396	return -EOPNOTSUPP; /* disabled wait */
ba5c1e9b CO	397	}
	398
	399	if (psw_extint_disabled(vcpu) \|\|
	400	(!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
	401	VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
	402	goto no_timer;
	403	}
	404
	405	now = get_clock() + vcpu->arch.sie_block->epoch;
	406	if (vcpu->arch.sie_block->ckc < now) {
	407	__unset_cpu_idle(vcpu);
	408	return 0;
	409	}
	410
ca872302	411	sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
ba5c1e9b	412
ca872302 CB	413	hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
ca872302 CB	414	VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
ba5c1e9b	415	no_timer:
b037a4f3	416	spin_lock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b	417	spin_lock_bh(&vcpu->arch.local_int.lock);
ba5c1e9b CO	418	add_wait_queue(&vcpu->arch.local_int.wq, &wait);
	419	while (list_empty(&vcpu->arch.local_int.list) &&
	420	list_empty(&vcpu->arch.local_int.float_int->list) &&
	421	(!vcpu->arch.local_int.timer_due) &&
	422	!signal_pending(current)) {
	423	set_current_state(TASK_INTERRUPTIBLE);
	424	spin_unlock_bh(&vcpu->arch.local_int.lock);
b037a4f3	425	spin_unlock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b	426	schedule();
b037a4f3	427	spin_lock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b CO	428	spin_lock_bh(&vcpu->arch.local_int.lock);
	429	}
	430	__unset_cpu_idle(vcpu);
	431	__set_current_state(TASK_RUNNING);
d3bc2f91	432	remove_wait_queue(&vcpu->arch.local_int.wq, &wait);
ba5c1e9b	433	spin_unlock_bh(&vcpu->arch.local_int.lock);
b037a4f3	434	spin_unlock(&vcpu->arch.local_int.float_int->lock);
ca872302	435	hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
ba5c1e9b CO	436	return 0;
	437	}
	438
ca872302	439	void kvm_s390_tasklet(unsigned long parm)
ba5c1e9b	440	{
ca872302	441	struct kvm_vcpu vcpu = (struct kvm_vcpu ) parm;
ba5c1e9b	442
ca872302	443	spin_lock(&vcpu->arch.local_int.lock);
ba5c1e9b CO	444	vcpu->arch.local_int.timer_due = 1;
	445	if (waitqueue_active(&vcpu->arch.local_int.wq))
	446	wake_up_interruptible(&vcpu->arch.local_int.wq);
ca872302	447	spin_unlock(&vcpu->arch.local_int.lock);
ba5c1e9b CO	448	}
ba5c1e9b CO	449
ca872302 CB	450	/*
	451	* low level hrtimer wake routine. Because this runs in hardirq context
	452	* we schedule a tasklet to do the real work.
	453	*/
	454	enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
	455	{
	456	struct kvm_vcpu *vcpu;
	457
	458	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
	459	tasklet_schedule(&vcpu->arch.tasklet);
	460
	461	return HRTIMER_NORESTART;
	462	}
ba5c1e9b CO	463
	464	void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
	465	{
180c12fb CB	466	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	467	struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
	468	struct kvm_s390_interrupt_info n, inti = NULL;
ba5c1e9b CO	469	int deliver;
	470
	471	__reset_intercept_indicators(vcpu);
	472	if (atomic_read(&li->active)) {
	473	do {
	474	deliver = 0;
	475	spin_lock_bh(&li->lock);
	476	list_for_each_entry_safe(inti, n, &li->list, list) {
	477	if (__interrupt_is_deliverable(vcpu, inti)) {
	478	list_del(&inti->list);
	479	deliver = 1;
	480	break;
	481	}
	482	__set_intercept_indicator(vcpu, inti);
	483	}
	484	if (list_empty(&li->list))
	485	atomic_set(&li->active, 0);
	486	spin_unlock_bh(&li->lock);
	487	if (deliver) {
	488	__do_deliver_interrupt(vcpu, inti);
	489	kfree(inti);
	490	}
	491	} while (deliver);
	492	}
	493
	494	if ((vcpu->arch.sie_block->ckc <
	495	get_clock() + vcpu->arch.sie_block->epoch))
	496	__try_deliver_ckc_interrupt(vcpu);
	497
	498	if (atomic_read(&fi->active)) {
	499	do {
	500	deliver = 0;
b037a4f3	501	spin_lock(&fi->lock);
ba5c1e9b CO	502	list_for_each_entry_safe(inti, n, &fi->list, list) {
	503	if (__interrupt_is_deliverable(vcpu, inti)) {
	504	list_del(&inti->list);
	505	deliver = 1;
	506	break;
	507	}
	508	__set_intercept_indicator(vcpu, inti);
	509	}
	510	if (list_empty(&fi->list))
	511	atomic_set(&fi->active, 0);
b037a4f3	512	spin_unlock(&fi->lock);
ba5c1e9b CO	513	if (deliver) {
	514	__do_deliver_interrupt(vcpu, inti);
	515	kfree(inti);
	516	}
	517	} while (deliver);
	518	}
	519	}
	520
	521	int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
	522	{
180c12fb CB	523	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
180c12fb CB	524	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	525
	526	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	527	if (!inti)
	528	return -ENOMEM;
	529
a419aef8	530	inti->type = KVM_S390_PROGRAM_INT;
ba5c1e9b CO	531	inti->pgm.code = code;
	532
	533	VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
ade38c31	534	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
ba5c1e9b CO	535	spin_lock_bh(&li->lock);
	536	list_add(&inti->list, &li->list);
	537	atomic_set(&li->active, 1);
	538	BUG_ON(waitqueue_active(&li->wq));
	539	spin_unlock_bh(&li->lock);
	540	return 0;
	541	}
	542
	543	int kvm_s390_inject_vm(struct kvm *kvm,
	544	struct kvm_s390_interrupt *s390int)
	545	{
180c12fb CB	546	struct kvm_s390_local_interrupt *li;
	547	struct kvm_s390_float_interrupt *fi;
	548	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	549	int sigcpu;
	550
	551	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	552	if (!inti)
	553	return -ENOMEM;
	554
	555	switch (s390int->type) {
	556	case KVM_S390_INT_VIRTIO:
33e19115	557	VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
ba5c1e9b CO	558	s390int->parm, s390int->parm64);
	559	inti->type = s390int->type;
	560	inti->ext.ext_params = s390int->parm;
	561	inti->ext.ext_params2 = s390int->parm64;
	562	break;
	563	case KVM_S390_INT_SERVICE:
	564	VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
	565	inti->type = s390int->type;
	566	inti->ext.ext_params = s390int->parm;
	567	break;
	568	case KVM_S390_PROGRAM_INT:
	569	case KVM_S390_SIGP_STOP:
7697e71f	570	case KVM_S390_INT_EXTERNAL_CALL:
ba5c1e9b CO	571	case KVM_S390_INT_EMERGENCY:
	572	default:
	573	kfree(inti);
	574	return -EINVAL;
	575	}
ade38c31 CH	576	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
ade38c31 CH	577	2);
ba5c1e9b CO	578
	579	mutex_lock(&kvm->lock);
	580	fi = &kvm->arch.float_int;
b037a4f3	581	spin_lock(&fi->lock);
ba5c1e9b CO	582	list_add_tail(&inti->list, &fi->list);
	583	atomic_set(&fi->active, 1);
	584	sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
	585	if (sigcpu == KVM_MAX_VCPUS) {
	586	do {
	587	sigcpu = fi->next_rr_cpu++;
	588	if (sigcpu == KVM_MAX_VCPUS)
	589	sigcpu = fi->next_rr_cpu = 0;
	590	} while (fi->local_int[sigcpu] == NULL);
	591	}
	592	li = fi->local_int[sigcpu];
	593	spin_lock_bh(&li->lock);
	594	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	595	if (waitqueue_active(&li->wq))
	596	wake_up_interruptible(&li->wq);
	597	spin_unlock_bh(&li->lock);
b037a4f3	598	spin_unlock(&fi->lock);
ba5c1e9b CO	599	mutex_unlock(&kvm->lock);
	600	return 0;
	601	}
	602
	603	int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
	604	struct kvm_s390_interrupt *s390int)
	605	{
180c12fb CB	606	struct kvm_s390_local_interrupt *li;
180c12fb CB	607	struct kvm_s390_interrupt_info *inti;
ba5c1e9b CO	608
	609	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	610	if (!inti)
	611	return -ENOMEM;
	612
	613	switch (s390int->type) {
	614	case KVM_S390_PROGRAM_INT:
	615	if (s390int->parm & 0xffff0000) {
	616	kfree(inti);
	617	return -EINVAL;
	618	}
	619	inti->type = s390int->type;
	620	inti->pgm.code = s390int->parm;
	621	VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
	622	s390int->parm);
	623	break;
b7e6e4d3 CB	624	case KVM_S390_SIGP_SET_PREFIX:
	625	inti->prefix.address = s390int->parm;
	626	inti->type = s390int->type;
	627	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
	628	s390int->parm);
	629	break;
ba5c1e9b CO	630	case KVM_S390_SIGP_STOP:
ba5c1e9b CO	631	case KVM_S390_RESTART:
7697e71f	632	case KVM_S390_INT_EXTERNAL_CALL:
ba5c1e9b CO	633	case KVM_S390_INT_EMERGENCY:
	634	VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
	635	inti->type = s390int->type;
	636	break;
	637	case KVM_S390_INT_VIRTIO:
	638	case KVM_S390_INT_SERVICE:
	639	default:
	640	kfree(inti);
	641	return -EINVAL;
	642	}
ade38c31 CH	643	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
ade38c31 CH	644	s390int->parm64, 2);
ba5c1e9b CO	645
	646	mutex_lock(&vcpu->kvm->lock);
	647	li = &vcpu->arch.local_int;
	648	spin_lock_bh(&li->lock);
	649	if (inti->type == KVM_S390_PROGRAM_INT)
	650	list_add(&inti->list, &li->list);
	651	else
	652	list_add_tail(&inti->list, &li->list);
	653	atomic_set(&li->active, 1);
	654	if (inti->type == KVM_S390_SIGP_STOP)
	655	li->action_bits \|= ACTION_STOP_ON_STOP;
	656	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	657	if (waitqueue_active(&li->wq))
	658	wake_up_interruptible(&vcpu->arch.local_int.wq);
	659	spin_unlock_bh(&li->lock);
	660	mutex_unlock(&vcpu->kvm->lock);
	661	return 0;
	662	}