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 */
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)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 a pending userspace external interrupt
42 */
pending_userspace_extint(struct kvm_vcpu * v)43 static int pending_userspace_extint(struct kvm_vcpu *v)
44 {
45 return v->arch.pending_external_vector != -1;
46 }
47
48 /*
49 * check if there is pending interrupt from
50 * non-APIC source without intack.
51 */
kvm_cpu_has_extint(struct kvm_vcpu * v)52 static int kvm_cpu_has_extint(struct kvm_vcpu *v)
53 {
54 u8 accept = kvm_apic_accept_pic_intr(v);
55
56 if (accept) {
57 if (irqchip_split(v->kvm))
58 return pending_userspace_extint(v);
59 else
60 return pic_irqchip(v->kvm)->output;
61 } else
62 return 0;
63 }
64
65 /*
66 * check if there is injectable interrupt:
67 * when virtual interrupt delivery enabled,
68 * interrupt from apic will handled by hardware,
69 * we don't need to check it here.
70 */
kvm_cpu_has_injectable_intr(struct kvm_vcpu * v)71 int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
72 {
73 if (!lapic_in_kernel(v))
74 return v->arch.interrupt.pending;
75
76 if (kvm_cpu_has_extint(v))
77 return 1;
78
79 if (kvm_vcpu_apic_vid_enabled(v))
80 return 0;
81
82 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
83 }
84
85 /*
86 * check if there is pending interrupt without
87 * intack.
88 */
kvm_cpu_has_interrupt(struct kvm_vcpu * v)89 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
90 {
91 if (!lapic_in_kernel(v))
92 return v->arch.interrupt.pending;
93
94 if (kvm_cpu_has_extint(v))
95 return 1;
96
97 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
98 }
99 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
100
101 /*
102 * Read pending interrupt(from non-APIC source)
103 * vector and intack.
104 */
kvm_cpu_get_extint(struct kvm_vcpu * v)105 static int kvm_cpu_get_extint(struct kvm_vcpu *v)
106 {
107 if (kvm_cpu_has_extint(v)) {
108 if (irqchip_split(v->kvm)) {
109 int vector = v->arch.pending_external_vector;
110
111 v->arch.pending_external_vector = -1;
112 return vector;
113 } else
114 return kvm_pic_read_irq(v->kvm); /* PIC */
115 } else
116 return -1;
117 }
118
119 /*
120 * Read pending interrupt vector and intack.
121 */
kvm_cpu_get_interrupt(struct kvm_vcpu * v)122 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
123 {
124 int vector;
125
126 if (!lapic_in_kernel(v))
127 return v->arch.interrupt.nr;
128
129 vector = kvm_cpu_get_extint(v);
130
131 if (vector != -1)
132 return vector; /* PIC */
133
134 return kvm_get_apic_interrupt(v); /* APIC */
135 }
136 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
137
kvm_inject_pending_timer_irqs(struct kvm_vcpu * vcpu)138 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
139 {
140 kvm_inject_apic_timer_irqs(vcpu);
141 /* TODO: PIT, RTC etc. */
142 }
143 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
144
__kvm_migrate_timers(struct kvm_vcpu * vcpu)145 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
146 {
147 __kvm_migrate_apic_timer(vcpu);
148 __kvm_migrate_pit_timer(vcpu);
149 }
150