[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 affiliates.
 *
 * 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)
{
	return apic_has_pending_timer(vcpu);
}
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);
	/* 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.
9611c187	4	* Copyright 2009 Red Hat, Inc. and/or its affiliates.
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	{
23e7a794	36	return apic_has_pending_timer(vcpu);
3d80840d MT	37	}
	38	EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
	39
85f455f7 ED	40	/*
	41	* check if there is pending interrupt without
	42	* intack.
	43	*/
	44	int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
	45	{
97222cc8 ED	46	struct kvm_pic *s;
97222cc8 ED	47
8061823a	48	if (!irqchip_in_kernel(v->kvm))
923c61bb	49	return v->arch.interrupt.pending;
8061823a	50
97222cc8	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
8061823a	70	if (!irqchip_in_kernel(v->kvm))
923c61bb	71	return v->arch.interrupt.nr;
8061823a	72
97222cc8 ED	73	vector = kvm_get_apic_interrupt(v); /* APIC */
97222cc8 ED	74	if (vector == -1) {
40487c68 QH	75	if (kvm_apic_accept_pic_intr(v)) {
	76	s = pic_irqchip(v->kvm);
	77	s->output = 0; /* PIC */
f5244726	78	vector = kvm_pic_read_irq(v->kvm);
40487c68	79	}
97222cc8 ED	80	}
97222cc8 ED	81	return vector;
85f455f7 ED	82	}
85f455f7 ED	83	EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
97222cc8	84
1b9778da ED	85	void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
	86	{
	87	kvm_inject_apic_timer_irqs(vcpu);
	88	/* TODO: PIT, RTC etc. */
	89	}
	90	EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
	91
2f599714 MT	92	void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
	93	{
	94	__kvm_migrate_apic_timer(vcpu);
	95	__kvm_migrate_pit_timer(vcpu);
	96	}