[deliverable/linux.git] / arch / x86 / kvm / irq.c

/*
 * irq.c: API for in kernel interrupt controller
 * Copyright (c) 2007, Intel Corporation.
 * Copyright 2009 Red Hat, Inc. and/or its affilates.
 *
 * 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"
#include "x86.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 (!irqchip_in_kernel(v->kvm))
		return v->arch.interrupt.pending;

	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;

	if (!irqchip_in_kernel(v->kvm))
		return v->arch.interrupt.nr;

	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.
221d059d	4	* Copyright 2009 Red Hat, Inc. and/or its affilates.
85f455f7 ED	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	17	* Place - Suite 330, Boston, MA 02111-1307 USA.
	18	* Authors:
	19	* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
	20	*
	21	*/
	22
	23	#include <linux/module.h>
edf88417	24	#include <linux/kvm_host.h>
85f455f7	25
85f455f7	26	#include "irq.h"
7837699f	27	#include "i8254.h"
8061823a	28	#include "x86.h"
85f455f7	29
3d80840d MT	30	/*
	31	* check if there are pending timer events
	32	* to be processed.
	33	*/
	34	int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
	35	{
	36	int ret;
	37
	38	ret = pit_has_pending_timer(vcpu);
	39	ret \|= apic_has_pending_timer(vcpu);
	40
	41	return ret;
	42	}
	43	EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
	44
85f455f7 ED	45	/*
	46	* check if there is pending interrupt without
	47	* intack.
	48	*/
	49	int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
	50	{
97222cc8 ED	51	struct kvm_pic *s;
97222cc8 ED	52
8061823a	53	if (!irqchip_in_kernel(v->kvm))
923c61bb	54	return v->arch.interrupt.pending;
8061823a	55
97222cc8	56	if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
40487c68 QH	57	if (kvm_apic_accept_pic_intr(v)) {
	58	s = pic_irqchip(v->kvm); /* PIC */
	59	return s->output;
	60	} else
	61	return 0;
97222cc8 ED	62	}
97222cc8 ED	63	return 1;
85f455f7 ED	64	}
	65	EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
	66
	67	/*
	68	* Read pending interrupt vector and intack.
	69	*/
	70	int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
	71	{
97222cc8	72	struct kvm_pic *s;
85f455f7 ED	73	int vector;
85f455f7 ED	74
8061823a	75	if (!irqchip_in_kernel(v->kvm))
923c61bb	76	return v->arch.interrupt.nr;
8061823a	77
97222cc8 ED	78	vector = kvm_get_apic_interrupt(v); /* APIC */
97222cc8 ED	79	if (vector == -1) {
40487c68 QH	80	if (kvm_apic_accept_pic_intr(v)) {
	81	s = pic_irqchip(v->kvm);
	82	s->output = 0; /* PIC */
f5244726	83	vector = kvm_pic_read_irq(v->kvm);
40487c68	84	}
97222cc8 ED	85	}
97222cc8 ED	86	return vector;
85f455f7 ED	87	}
85f455f7 ED	88	EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
97222cc8	89
1b9778da ED	90	void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
	91	{
	92	kvm_inject_apic_timer_irqs(vcpu);
7837699f	93	kvm_inject_pit_timer_irqs(vcpu);
1b9778da ED	94	/* TODO: PIT, RTC etc. */
	95	}
	96	EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
	97
2f599714 MT	98	void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
	99	{
	100	__kvm_migrate_apic_timer(vcpu);
	101	__kvm_migrate_pit_timer(vcpu);
	102	}