irq.c

Go to the documentation of this file.

/*
 * 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 <[email protected]>
 *
 */

#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);
}