[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 from
 * non-APIC source without intack.
 */
static int kvm_cpu_has_extint(struct kvm_vcpu *v)
{
	if (kvm_apic_accept_pic_intr(v))
		return pic_irqchip(v->kvm)->output;	/* PIC */
	else
		return 0;
}

/*
 * check if there is injectable interrupt:
 * when virtual interrupt delivery enabled,
 * interrupt from apic will handled by hardware,
 * we don't need to check it here.
 */
int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
{
	if (!irqchip_in_kernel(v->kvm))
		return v->arch.interrupt.pending;

	if (kvm_cpu_has_extint(v))
		return 1;

	if (kvm_apic_vid_enabled(v->kvm))
		return 0;

	return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
}

/*
 * check if there is pending interrupt without
 * intack.
 */
int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
{
	if (!irqchip_in_kernel(v->kvm))
		return v->arch.interrupt.pending;

	if (kvm_cpu_has_extint(v))
		return 1;

	return kvm_apic_has_interrupt(v) != -1;	/* LAPIC */
}
EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);

/*
 * Read pending interrupt(from non-APIC source)
 * vector and intack.
 */
static int kvm_cpu_get_extint(struct kvm_vcpu *v)
{
	if (kvm_cpu_has_extint(v))
		return kvm_pic_read_irq(v->kvm); /* PIC */
	return -1;
}

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

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

	vector = kvm_cpu_get_extint(v);

	if (kvm_apic_vid_enabled(v->kvm) || vector != -1)
		return vector;			/* PIC */

	return kvm_get_apic_interrupt(v);	/* APIC */
}

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
	1	/*
	2	* irq.c: API for in kernel interrupt controller
	3	* Copyright (c) 2007, Intel Corporation.
	4	* Copyright 2009 Red Hat, Inc. and/or its affiliates.
	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>
	24	#include <linux/kvm_host.h>
	25
	26	#include "irq.h"
	27	#include "i8254.h"
	28	#include "x86.h"
	29
	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	return apic_has_pending_timer(vcpu);
	37	}
	38	EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
	39
	40	/*
	41	* check if there is pending interrupt from
	42	* non-APIC source without intack.
	43	*/
	44	static int kvm_cpu_has_extint(struct kvm_vcpu *v)
	45	{
	46	if (kvm_apic_accept_pic_intr(v))
	47	return pic_irqchip(v->kvm)->output; /* PIC */
	48	else
	49	return 0;
	50	}
	51
	52	/*
	53	* check if there is injectable interrupt:
	54	* when virtual interrupt delivery enabled,
	55	* interrupt from apic will handled by hardware,
	56	* we don't need to check it here.
	57	*/
	58	int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
	59	{
	60	if (!irqchip_in_kernel(v->kvm))
	61	return v->arch.interrupt.pending;
	62
	63	if (kvm_cpu_has_extint(v))
	64	return 1;
	65
	66	if (kvm_apic_vid_enabled(v->kvm))
	67	return 0;
	68
	69	return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
	70	}
	71
	72	/*
	73	* check if there is pending interrupt without
	74	* intack.
	75	*/
	76	int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
	77	{
	78	if (!irqchip_in_kernel(v->kvm))
	79	return v->arch.interrupt.pending;
	80
	81	if (kvm_cpu_has_extint(v))
	82	return 1;
	83
	84	return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
	85	}
	86	EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
	87
	88	/*
	89	* Read pending interrupt(from non-APIC source)
	90	* vector and intack.
	91	*/
	92	static int kvm_cpu_get_extint(struct kvm_vcpu *v)
	93	{
	94	if (kvm_cpu_has_extint(v))
	95	return kvm_pic_read_irq(v->kvm); /* PIC */
	96	return -1;
	97	}
	98
	99	/*
	100	* Read pending interrupt vector and intack.
	101	*/
	102	int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
	103	{
	104	int vector;
	105
	106	if (!irqchip_in_kernel(v->kvm))
	107	return v->arch.interrupt.nr;
	108
	109	vector = kvm_cpu_get_extint(v);
	110
	111	if (kvm_apic_vid_enabled(v->kvm) \|\| vector != -1)
	112	return vector; /* PIC */
	113
	114	return kvm_get_apic_interrupt(v); /* APIC */
	115	}
	116
	117	void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
	118	{
	119	kvm_inject_apic_timer_irqs(vcpu);
	120	/* TODO: PIT, RTC etc. */
	121	}
	122	EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
	123
	124	void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
	125	{
	126	__kvm_migrate_apic_timer(vcpu);
	127	__kvm_migrate_pit_timer(vcpu);
	128	}