mirror of https://gitee.com/openkylin/linux.git
153 lines
3.4 KiB
C
153 lines
3.4 KiB
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/export.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)
|
|
{
|
|
if (lapic_in_kernel(vcpu))
|
|
return apic_has_pending_timer(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
|
|
|
|
/*
|
|
* check if there is a pending userspace external interrupt
|
|
*/
|
|
static int pending_userspace_extint(struct kvm_vcpu *v)
|
|
{
|
|
return v->arch.pending_external_vector != -1;
|
|
}
|
|
|
|
/*
|
|
* check if there is pending interrupt from
|
|
* non-APIC source without intack.
|
|
*/
|
|
static int kvm_cpu_has_extint(struct kvm_vcpu *v)
|
|
{
|
|
u8 accept = kvm_apic_accept_pic_intr(v);
|
|
|
|
if (accept) {
|
|
if (irqchip_split(v->kvm))
|
|
return pending_userspace_extint(v);
|
|
else
|
|
return pic_irqchip(v->kvm)->output;
|
|
} 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 (!lapic_in_kernel(v))
|
|
return v->arch.interrupt.pending;
|
|
|
|
if (kvm_cpu_has_extint(v))
|
|
return 1;
|
|
|
|
if (kvm_vcpu_apicv_active(v))
|
|
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 (!lapic_in_kernel(v))
|
|
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)) {
|
|
if (irqchip_split(v->kvm)) {
|
|
int vector = v->arch.pending_external_vector;
|
|
|
|
v->arch.pending_external_vector = -1;
|
|
return vector;
|
|
} else
|
|
return kvm_pic_read_irq(v->kvm); /* PIC */
|
|
} else
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Read pending interrupt vector and intack.
|
|
*/
|
|
int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
|
|
{
|
|
int vector;
|
|
|
|
if (!lapic_in_kernel(v))
|
|
return v->arch.interrupt.nr;
|
|
|
|
vector = kvm_cpu_get_extint(v);
|
|
|
|
if (vector != -1)
|
|
return vector; /* PIC */
|
|
|
|
return kvm_get_apic_interrupt(v); /* APIC */
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
|
|
|
|
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (lapic_in_kernel(vcpu))
|
|
kvm_inject_apic_timer_irqs(vcpu);
|
|
}
|
|
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);
|
|
}
|