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 */
34int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
35{
36	return apic_has_pending_timer(vcpu);
37}
38EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
39
40/*
41 * check if there is pending interrupt from
42 * non-APIC source without intack.
43 */
44static 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 */
58int 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 */
76int 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}
86EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
87
88/*
89 * Read pending interrupt(from non-APIC source)
90 * vector and intack.
91 */
92static 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 */
102int 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 (vector != -1)
112		return vector;			/* PIC */
113
114	return kvm_get_apic_interrupt(v);	/* APIC */
115}
116EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
117
118void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
119{
120	kvm_inject_apic_timer_irqs(vcpu);
121	/* TODO: PIT, RTC etc. */
122}
123EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
124
125void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
126{
127	__kvm_migrate_apic_timer(vcpu);
128	__kvm_migrate_pit_timer(vcpu);
129}
130