[mirror_ubuntu-artful-kernel.git] / arch / x86 / kvm / irq.c

/*
 * irq.c: API for in kernel interrupt controller
 * Copyright (c) 2007, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 * Authors:
 *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/kvm_host.h>

#include "irq.h"
#include "i8254.h"

/*
 * check if there are pending timer events
 * to be processed.
 */
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
	int ret;

	ret = pit_has_pending_timer(vcpu);
	ret |= apic_has_pending_timer(vcpu);

	return ret;
}
EXPORT_SYMBOL(kvm_cpu_has_pending_timer);

/*
 * check if there is pending interrupt without
 * intack.
 */
int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
{
	struct kvm_pic *s;

	if (kvm_apic_has_interrupt(v) == -1) {	/* LAPIC */
		if (kvm_apic_accept_pic_intr(v)) {
			s = pic_irqchip(v->kvm);	/* PIC */
			return s->output;
		} else
			return 0;
	}
	return 1;
}
EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);

/*
 * Read pending interrupt vector and intack.
 */
int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
{
	struct kvm_pic *s;
	int vector;

	vector = kvm_get_apic_interrupt(v);	/* APIC */
	if (vector == -1) {
		if (kvm_apic_accept_pic_intr(v)) {
			s = pic_irqchip(v->kvm);
			s->output = 0;		/* PIC */
			vector = kvm_pic_read_irq(v->kvm);
		}
	}
	return vector;
}
EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);

void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
{
	kvm_inject_apic_timer_irqs(vcpu);
	kvm_inject_pit_timer_irqs(vcpu);
	/* TODO: PIT, RTC etc. */
}
EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);

void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
{
	__kvm_migrate_apic_timer(vcpu);
	__kvm_migrate_pit_timer(vcpu);
}
Commit	Line	Data
85f455f7 ED	1	/*
	2	* irq.c: API for in kernel interrupt controller
	3	* Copyright (c) 2007, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	16	* Place - Suite 330, Boston, MA 02111-1307 USA.
	17	* Authors:
	18	* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
	19	*
	20	*/
	21
	22	#include <linux/module.h>
edf88417	23	#include <linux/kvm_host.h>
85f455f7	24
85f455f7	25	#include "irq.h"
7837699f	26	#include "i8254.h"
85f455f7	27
3d80840d MT	28	/*
	29	* check if there are pending timer events
	30	* to be processed.
	31	*/
	32	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	33	{
	34	int ret;
	35
	36	ret = pit_has_pending_timer(vcpu);
	37	ret \|= apic_has_pending_timer(vcpu);
	38
	39	return ret;
	40	}
	41	EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
	42
85f455f7 ED	43	/*
	44	* check if there is pending interrupt without
	45	* intack.
	46	*/
	47	int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
	48	{
97222cc8 ED	49	struct kvm_pic *s;
	50
	51	if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
40487c68 QH	52	if (kvm_apic_accept_pic_intr(v)) {
	53	s = pic_irqchip(v->kvm); /* PIC */
	54	return s->output;
	55	} else
	56	return 0;
97222cc8 ED	57	}
97222cc8 ED	58	return 1;
85f455f7 ED	59	}
	60	EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
	61
	62	/*
	63	* Read pending interrupt vector and intack.
	64	*/
	65	int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
	66	{
97222cc8	67	struct kvm_pic *s;
85f455f7 ED	68	int vector;
85f455f7 ED	69
97222cc8 ED	70	vector = kvm_get_apic_interrupt(v); /* APIC */
97222cc8 ED	71	if (vector == -1) {
40487c68 QH	72	if (kvm_apic_accept_pic_intr(v)) {
	73	s = pic_irqchip(v->kvm);
	74	s->output = 0; /* PIC */
f5244726	75	vector = kvm_pic_read_irq(v->kvm);
40487c68	76	}
97222cc8 ED	77	}
97222cc8 ED	78	return vector;
85f455f7 ED	79	}
85f455f7 ED	80	EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
97222cc8	81
1b9778da ED	82	void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
	83	{
	84	kvm_inject_apic_timer_irqs(vcpu);
7837699f	85	kvm_inject_pit_timer_irqs(vcpu);
1b9778da ED	86	/* TODO: PIT, RTC etc. */
	87	}
	88	EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
	89
2f599714 MT	90	void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
	91	{
	92	__kvm_migrate_apic_timer(vcpu);
	93	__kvm_migrate_pit_timer(vcpu);
	94	}